FILTER CLEANER ASSEMBLY

Description

RELATED APPLICATIONS

This application claims priority to U.S. Provisional Application No. 63/655,415, filed on Jun. 3, 2024, U.S. Provisional Application No. 63/718,217, filed Nov. 8, 2024, and U.S. Provisional Application No. 63/793,963, filed on Apr. 24, 2025. The entire contents of each is hereby incorporated by reference.

FIELD

The present disclosure relates generally to air-moving units such as vacuum cleaners, and more specifically to air-moving units having filter cleaning capabilities.

BACKGROUND

Traditional air-moving unit designs, such as vacuum cleaners, typically include a filter positioned upstream of the blower assembly.

SUMMARY

In one instance, a filter assembly for use with a power head having a blower assembly with a blower inlet contained therein and a collection container defining a collection volume, the filter assembly including a housing, where the housing includes a first connection interface configured to releasably attach to the power head, and a second connection interface configured to releasably attach to the collection container, a first filter passageway extending between and open to both first connection interface and the second connection interface, a first filter region positioned within the first passageway between the first connection interface and the second connection interface, and a master control assembly, where the master control assembly is configured to selectively reverse the flow of air through the first filter region.

Alternatively or additionally, in any combination, where the housing is configured to be stacked between the power head and the collection container.

Alternatively or additionally, in any combination, further including a second passageway extending between and open to both the first connection interface and the second connection interface, a second filter region positioned within the second passageway between the first connection interface and the second connection interface, and where the master control assembly is configured to selectively reverse the flow of air through the second filter region.

Alternatively or additionally, in any combination, where the first filter region has a first end facing the second connection interface and a second end opposite the first end, where air flows through the first filter region in a first direction when it enters via the first end and exits via the second end, and where air flows through the first filter region in a second direction when it enters via the second end and exits via the first end, the second filter region has a third end facing the second connection interface and a fourth end opposite the third end, where air flows through the first filter region in a third direction when it enters via the third end and exists via the fourth end, and where air flows through the second filter region in a fourth direction when it enters via the fourth end and exits via the third end, and where the master control assembly is operable in a first configuration, in which air passes through the first filter region in the first direction and passes through the second filter region in the third direction, a second configuration, in which air passes through the first filter region in the second direction and passes through the second filter region in the third direction, and a third configuration, in which air passes through the first filter region in the first direction and passes through the second filter region in the fourth direction.

Alternatively or additionally, in any combination, where the first connection interface is in fluid communication with the blower inlet of the blower assembly when the filter assembly is attached to the power head, and where the second connection interface is in fluid communication with the collection volume when the filter assembly is attached to the collection container.

Alternatively or additionally, in any combination, further including an ambient air port open to the exterior of the housing.

Alternatively or additionally, in any combination, further including a first valve assembly, where the first valve assembly is adjustable between a first configuration, in which the first filter region is in fluid communication with the first connection interface and not in fluid communication with the ambient air port, and a second configuration, in which the first filter region is in fluid communication with the ambient air port and not in fluid communication with the first connection interface.

Alternatively or additionally, in any combination, where the master control assembly is configured to reverse the flow of air through the first filter region without the use of electrical power.

Alternatively or additionally, in any combination, further including a transition passage extending between and open to the second connection interface and the exterior of the housing, and a valve assembly positioned in the transition passage, where the valve is adjustable between an open configuration, in which air can flow through the transition passage, and a closed configuration, in which air cannot flow through the transition passage.

Alternatively or additionally, in any combination, where the master control assembly is configured to adjust the valve between the open configuration and the closed configuration.

Alternatively or additionally, in any combination, where the master control assembly is configured to coordinate adjusting the valve between the open and closed configurations and reversing the flow of air through the first filter region.

Alternatively or additionally, in any combination, where the transition passage extends between and is open to both the first connection interface and the second connection interface.

Alternatively or additionally, in any combination, further including a first coupling element positioned proximate the first connection interface for releasably connecting the housing and the power head, and a second coupling element positioned proximate the second connection interface for releasably connecting the housing with the collection container.

In another instance, a filter assembly for use with a power head having a blower assembly with a blower inlet contained therein, and a collection container defining a collection volume, the filter assembly including a housing, where the housing includes a first connection interface configured to releasably attach to the power head, and a second connection interface configured to releasably attach to the collection container, a first filter region, the first filter region having a first end open to and in fluid communication with the second connection interface and a second end opposite the first end, a second filter region, the second filter region having a third end open to and in fluid communication with the second connection interface and a fourth end opposite the first end, an ambient air inlet open to the exterior of the housing, a first valve assembly adjustable between a first configuration, in which the second end of the first filter region is in fluid communication with the first connection interface and not in fluid communication with the ambient air inlet, and a second configuration, in which the second end of the first filter region is in fluid communication with the ambient air inlet and not in fluid communication with the first connection interface, and a second valve assembly adjustable between a third configuration, in which the fourth end of the second filter region is in fluid communication with the first connection interface and not in fluid communication with the ambient air inlet, and a fourth configuration, in which the fourth end of the second filter region is in fluid communication with the ambient air inlet and not in fluid communication with the first communication interface.

Alternatively or additionally, in any combination, where the first connection interface is in fluid communication with the blower inlet of the blower assembly when the filter assembly is attached to the power head, and where the second connection interface is in fluid communication with the collection volume when the filter assembly is attached to the collection container.

Alternatively or additionally, in any combination, further including a master control assembly including a shaft rotatable relative to the housing, a first cam mounted to the shaft for rotation together therewith, where the first cam is configured to operatively engage the first valve assembly, a second cam mounted to the shaft for rotation together therewith, where the second cam is configured to operatively engage the second valve assembly, and where rotating the shaft in a first direction causes the first valve assembly to adjust from the first configuration to the second configuration and causes the second valve assembly to remain in the third configuration, and where rotating the shaft in a second direction opposite the first direction causes the first valve assembly to remain in the first configuration and causes the second valve assembly to adjust from the third configuration to the fourth configuration.

Alternatively or additionally, in any combination, where the first cam and the second cam are mounted 180 degrees apart.

Alternatively or additionally, in any combination, further including a transition passage open to and extending between the second connection interface and the exterior of the housing, and a third valve assembly positioned in the transition passage, where the valve is adjustable between an open configuration, in which air can flow through the transition passage, and a closed configuration, in which air cannot flow through the transition passage.

Alternatively or additionally, in any combination, further including a master control assembly, where the master control assembly in operable communication with the first valve assembly, the second valve assembly, and the third valve assembly, and where the master control assembly is configured to initiate adjusting the third valve assembly before initiate adjusting the second valve assembly or the third valve assembly.

In another aspect, a filter assembly for use with a power head having a blower assembly with a blower inlet contained therein and a collection container defining a collection volume, the filter assembly including a housing, where the housing includes a first connection interface configured to releasably attach to the power head, and a second connection interface configured to releasably attach to the collection container, a first filter passageway extending between and open to both first connection interface and the second connection interface, a first filter region positioned within the first passageway between the first connection interface and the second connection interface, and a filter cleaning mechanism configured to clean the first filter region.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side schematic view of a vacuum assembly.

FIG. 2 is a side schematic view of the vacuum assembly of FIG. 1 with a vacuum assembly installed thereon.

FIG. 3A is a schematic of the vacuum assembly of FIG. 2 in a standard operating configuration.

FIG. 3B is a schematic of the vacuum assembly of FIG. 2 in a first filter cleaning configuration.

FIG. 3C is a schematic of the vacuum assembly of FIG. 2 in a second filter cleaning configuration.

FIGS. 4 and 5 are top perspective views of an embodiment of a filter assembly.

FIG. 6 is a bottom perspective view of the filter assembly of FIG. 4.

FIG. 7 is a top view of the filter assembly of FIG. 4.

FIG. 8A is a section view taken along line 8A-8A of FIG. 7.

FIG. 8B is a section view taken along line 8B-8B of FIG. 7.

FIG. 9 is a detailed top perspective view of the filter assembly of FIG. 4 with the perimeter wall removed.

FIG. 10 is a front view of the filter assembly of FIG. 4.

FIG. 11 is a section view taken long line 11-11 of FIG. 7.

FIG. 12 is a section view taken along line 12-12 of FIG. 7.

FIGS. 13-14 illustrate another embodiment of a filter assembly.

FIGS. 15-21 illustrate another embodiment of a filter assembly.

FIGS. 22-24 illustrate another embodiment of a filter assembly.

FIG. 25 is a top perspective view of another embodiment of a filter assembly.

FIG. 26 is a bottom perspective view of the filter assembly of FIG. 25.

FIG. 27 is a top view of the filter assembly of FIG. 25.

FIG. 28 is a bottom view of the filter assembly of FIG. 25.

FIG. 29 is a side view of the filter assembly of FIG. 25.

FIG. 30 is a section view taken along line 30-30 of FIG. 27.

FIGS. 30A-30D illustrate multiple embodiments of a coarse filter incorporated into the filter assembly of FIG. 25.

FIG. 31 is a detailed top view of the ambient air port of the filter assembly of FIG. 25.

FIG. 32 is a detailed top view of the master control assembly of the filter assembly of FIG. 25.

FIG. 33 is a section view taken along line 33-33 of FIG. 27.

FIG. 34 is a top perspective view of the filter assembly of FIG. 25 with the perimeter wall removed for clarity.

FIG. 35 is a detailed side view of the user inputs of the filter assembly of FIG. 25.

FIG. 36 is the detailed side view of FIG. 35 with the user inputs taken in section.

FIGS. 37A-37E are detailed side views of FIG. 35 with the user inputs in various positions of operation.

FIG. 38 is a schematic view of a single filter element sub-divided into two filter regions.

FIGS. 39A-39B illustrate multiple embodiments of a divider incorporated into the filter assembly of FIG. 25.

FIGS. 40-42 illustrate the filters of the filter assembly of FIG. 25 shown in different mounting angles.

FIG. 43 discloses one possible valve configuration.

FIGS. 44A through 44C disclose one possible valve configuration.

FIGS. 45A through 45H illustrate different embodiments of valve configurations for use with the filter assembly.

FIGS. 46A through 46C illustrate different embodiments of internal locking configurations for the user inputs of the filter assembly of FIG. 25.

FIGS. 46D-46F illustrate different embodiments of user input layouts for use with the filter assembly of FIG. 25.

FIGS. 46G and 46H are exterior perspective views of the filter assembly of FIG. 25.

FIGS. 47A through 47C illustrate different inlet valve configurations.

FIGS. 48A through 48C illustrate different transition passage configurations.

FIGS. 49A and 49B illustrate an alternative mechanism for unlocking the filter designator of the filter assembly of FIG. 25.

FIGS. 50A through 50F illustrate various alternative master control assemblies.

FIGS. 51A through 51D illustrate alternative filter layout configurations for the filter assembly of FIG. 25.

FIGS. 52A through 52C illustrate multiple embodiments of filter frame attachment elements.

FIG. 53 is a section view of the transition passage illustrating another embodiment of a valve.

FIG. 54 is a bottom view of the seat of the valve of FIG. 53.

FIG. 55 is a top perspective view of the gate of the valve of FIG. 53.

FIG. 56 is a side view of the gate of FIG. 55.

FIG. 57 is a bottom perspective view of the gate of FIG. 55.

FIG. 58 is a side section view of the valve of FIG. 53 is a closed position.

FIG. 59 is a side section view of the valve of FIG. 53 is a first intermediate position.

FIG. 60 is a side section view of the valve of FIG. 53 in a second intermediate position.

DETAILED DESCRIPTION

Before any embodiments are explained in detail, it is to be understood that the disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The disclosure is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. The terms “mounted,” “connected” and “coupled” are used broadly and encompass both direct and indirect mounting, connecting and coupling. Further, “connected” and “coupled” are not restricted to physical or mechanical connections or couplings, and can include hydraulic or electrical connections or couplings, whether direct or indirect.

FIGS. 2, and 4-12 illustrate a filter assembly 100 for use with a vacuum assembly 104 (e.g., a two-piece wet/dry vac). The filter assembly 100 is configured to be incorporated into the airflow path of the pre-existing vacuum assembly 104 without the need of any dedicated hoses, external connections, or external electrical power sources. In some embodiments, the filter assembly 100 may be installed (e.g., stacked) between the power head 108 and the collection container 112 of the vacuum assembly 104 where the filter assembly 100 incorporates one or more filters 116a, 116b into the airflow path upstream of the blower assembly 120 of the power head 108 (discussed below). In some embodiments, the filter assembly 100 also includes a filter cleaning assembly configured to clean the one or more filters 116a, 116b contained therein without having to remove or otherwise access the filter 116a, 116b directly. In the illustrated embodiment, the filter assembly 100 does so by selectively manipulating the airflow passing through each of the one or more filters 116a, 116b. In still further embodiments, the filter assembly 100 is configured to manipulate the airflow passing through each of the one or more filters 116a, 116b while the blower assembly 120 of the corresponding power head 108 generates a constant airflow.

While the illustrated filter assembly 100 is shown installed in a pre-existing wet/dry vacuum assembly 104 as a separate accessory, it is understood that in other embodiments the filter assembly 100 may be incorporated into one of the power head 108 or collection container 112. Furthermore, the filter assembly 100 is not limited for use in wet/dry vacuums. Rather, the present application is more generally directed to air-moving devices that utilizes a filter. For example, air-moving devices may include, but are not limited to, upright vacuums, stick vacuums, air compressors, air conditioning units, furnaces, and the like.

The vacuum assembly 104 of FIG. 1 is a form of wet/dry vacuum assembly including a collection vessel or container 112 defining a collection volume 124 therein, and a power head 108 couplable to the collection container 112.

The container 112 of the vacuum assembly 104 includes a body 128 at least partially defining the collection volume 124 therein. More specifically, the body 128 includes a base wall 136, and a plurality of side walls 140 extending from the periphery of the base wall 136 to define an open end 144 opposite thereof. The resulting open end 144 establishes a first connection interface and provides access to the collection volume 124. In the illustrated embodiment, the base wall 136 is generally octagonal in shape having eight side walls 140 extending upwardly therefrom. However, in other embodiments, different shaped containers may be present.

As shown in FIG. 2, the open end 144 of the container 112 forms a connection interface to which other devices (e.g., the power head 108 or the filter assembly 100) may be releasably attached. During use, the open end 144 serves to physically align the connected elements (e.g., vertically, horizontally, and rotationally) while also establishing an internal connection region where various operable connections (e.g., airflow passage connections, electrical connections, debris passage connections, and the like) may be made and the transfer of material (e.g., air, dust, debris, and the like) may occur within the confines of the assembled vacuum's structure.

The container 112 may also include a coupling element 148 positioned proximate the open end 144 and configured to form a releasable connection with a corresponding coupling element 148 of either the power head 108 or the filter assembly 100.

As shown in FIGS. 1 and 2, the power head 108 of the vacuum assembly 104 includes a housing 152 at least partially defining a power head volume 156, a blower assembly 120 at least partially positioned within the power head volume 156, and an inlet passage 160 open to the exterior of the housing 152.

The housing 152 of the power head 108 includes a series of walls positioned to at least partially enclose the power head volume 156 therein. More specifically, the housing 152 includes a bottom or base wall 168a, one or more side walls 168b extending from the base wall 168a, and a top wall 168c enclosing the side walls 168b opposite the base wall 168a. In the illustrated embodiment, the housing 152 also forms one or more battery ports (not shown) into which rechargeable batteries (not shown) may be inserted to power the blower assembly 120. In still other embodiments, an electrical outlet or extension cord (not shown) may be incorporated into the housing 152 in lieu of or to supplement the battery ports.

The inlet passage 160 of the power head 108 includes a fluid passage or channel configured to receive untreated air from a hose or other vacuum accessory (not shown) and convey the untreated air to one of the collection volume 124 and/or the filter assembly 100. More specifically, the inlet passage 160 includes a first end 176 that is open to the exterior of the housing 152 to serve as a mounting point to which a hose or other vacuum accessory (not shown) may be releasably attached during use. The inlet passage 160 also includes second end 180 opposite the first end 176 that extends downwardly away from the base wall 168a to form an open distal end (see FIG. 2).

The blower assembly 120 of the power head 108 includes a blower or fan configured to generate an airflow within the vacuum assembly 104. More specifically, the blower assembly 120 includes a blower inlet 192 that is in fluid communication with and draws air into the blower assembly 120 (i.e., from the collection volume 124 and/or the discharge air port 228, discussed below), and a blower outlet 200 that is open and exhausts air to the exterior of the housing 152. During operation, the blower assembly 120 is intended to draw power from a power source such as a rechargeable battery, a wall outlet, and the like.

In the illustrated embodiment, the blower inlet 192 includes a passageway that is open through the base wall 168a. Furthermore, the illustrated blower inlet 192 includes a filter assembly 204. In such embodiments, the filter assembly 204 may be releasably attached to the base wall 168a whereby the filter itself extends downwardly away from the base wall 168a of the housing 152. During use, the filter assembly 204 is oriented and positioned such that it will extend into one of the collection volume 124 (e.g., when the power head 108 is attached directly to the container 112; see FIG. 1) or the discharge air port 228 (e.g., when the power head 108 is attached directly to the filter assembly 100; see FIG. 2).

As shown in FIG. 2, the base wall 168a of the housing 152 of the power head 108 at least partially forms a second connection interface to which other devices (e.g., the container 112 or the filter assembly 100) may be releasably attached. Similar to the open end 144 of the container 112, the base wall 168a of the housing 152 serves to physically align the connected elements while also establishing a second internal connection region through which operable connections and material exchange may occur within the confines of the combined vacuum structure.

The power head 108 may also include a coupling element 148 positioned proximate the base wall 168a and configured to form a releasable connection with a corresponding coupling element 148 of either the container 112 or the filter assembly 100.

As shown in FIGS. 2 and 4-12, the filter assembly 100 is configured to be stacked between a power head 108 and a container 112 to position one or more filters 116a, 116b within the air path of the vacuum assembly 104 upstream of the blower assembly 120. In some embodiments, the filter assembly 100 is configured to position a plurality of filters 116a, 116b (i.e., two filters) in a parallel flow orientation with respect to one another (see FIGS. 2 and 3A-3C). In still other embodiments, the filter assembly 100 forms a plurality of passageways extending between and being open to a container connection interface and a power head connection interface (discussed below) with a corresponding filter 116a, 116b being positioned within each passageway. Once the filter assembly 100 is stacked between the power head 108 and the container 112, each passageway extends between and is in fluid communication with the blower inlet 192 and the collection volume 124 via the power head connection interface and container connection interface, respectively.

In the illustrated filter assembly 100, each filter 116a, 116b represents a corresponding filter region, where the flow of air through each filter region 116a, 116b may be independently manipulated by the user without having to remove or otherwise access the filters 116a, 116b directly. In other embodiments, a single filter may be installed on the filter assembly 100 that is subdivided into a plurality of filter regions. In such embodiments, the flow of air through each filter region within the single filter may be independently manipulated by the user without having to remove or otherwise access the single filter.

The illustrated filter assembly 100 includes a housing 216 at least partially defining a filter assembly volume 252, one or more filters 116a, 116b removably coupled to the filter housing 216, one or more filter control assemblies 220a, 220b each associated with a corresponding filter 116a, 116b, an ambient air port 224, and a discharge air port 228. The filter assembly 100 also includes a transition passage 232 extending between and providing a fluid pathway between the second end 180 of the inlet passage 160 and the collection volume 124 of the collection container 112. The filter assembly 100 also includes a transition control assembly 236 to selectively control the flow of air through the transition passage 232 during use.

The filter assembly housing 216 includes a perimeter wall 240 extending around the perimeter of the filter assembly 100 to produce a first or container end 244, and a second or power head end 248 opposite the first end 244. The first container end 244, in turn, defines the first or container connection interface to which the collection container 112 may be releasably attached. During use, the container connection interface serves to physically align an internal connection region where various operable connections (e.g., airflow passage connections, debris passage connections, and the like) may be made and the transfer of material (e.g., dust, air, debris, and the like) may occur within the confines of the assembled vacuum's structure. When the container 112 is attached to the filter assembly 100, the container connection interface is open to and in fluid communication with the collection volume 124.

The second end 248 defines the second or power head connection interface to which the power head 108 may be releasably attached. During use, the power head connection interface serves to physically align an internal connection region where various operable connections (e.g., airflow passage connections, debris passage connections, and the like) may be made and the transfer of material (e.g., dust, air, debris, and the like) may occur within the confines of the assembled vacuum's structure. When the power head 108 is attached to the filter assembly 100, the power head connection interface is in fluid communication with blower inlet 192 and the second end 180 of the inlet passage 160.

The perimeter wall 240 also encloses and defines the filter assembly volume 252. As shown in FIG. 2, the first end 244 of the perimeter wall 240 has a cross-sectional shape that generally corresponds to the cross-sectional shape of the open end 144 of the container 112 while the second end 248 of the perimeter wall 240 has a cross-sectional shape that generally corresponds to the shape of the base wall 168a of the power head 108. In the illustrated embodiment, both the first end 244 and the second end 248 have a generally octagonal shapes similar to the octagonal cross-sectional shapes of the container 112 and power head unit 108, respectively.

The filter assembly housing 216 also includes a base wall 256 oriented generally perpendicular to the perimeter wall 240 and positioned proximate the first end 244. When the filter assembly 100 is mounted to the container 112, the base wall 256 is positioned such that the underside thereof is open to and at least partially encloses a portion of the collection volume 124.

As shown in FIGS. 2 and 3A-3C, the ambient air port 224 of the filter assembly 100 includes an access point permitting the ingress of clean, ambient air into the flow path of the filter assembly 100. More specifically, the illustrated ambient air port 224 provides a fluid passage between each of the filters 116a, 116b and the exterior of the vacuum assembly 104 through which clean, ambient air may be drawn into the filter assembly 100 for the filter cleaning process (discussed below). In some embodiments, the ambient air port 224 provides a fluid passage between the second ends 260a, 260b of the filters 116a, 116b (discussed below) and the exterior of the vacuum assembly 104. While the illustrated filter assembly 100 includes a single ambient air port 224 in selective fluid communication with both of the filters 116a, 116b, it is understood that in other embodiments, multiple dedicated ambient air ports 224 may be present.

As shown in FIGS. 2 and 4, the discharge air port 228 of the filter assembly 100 provides a fluid passage between both filters 116a, 116b and the inlet 192 of the blower assembly 120. In the illustrated embodiment, the discharge air port 228 includes a chamber 230 at least partially defined by the housing 216 of the filter assembly 100 and that is in fluid communication with the inlet 192, the second end 260a of the first filter 116a, and the second end 260b of the second filter 116b (described below).

In embodiments where the power head 108 includes a filter assembly 204, the discharge air port 228 (i.e., the chamber 230) may be sufficiently sized so that the filter assembly 204 may be at least partially positioned therein such that the filter assembly 204 of the power head 108 is positioned downstream of both filters 116a, 116b of the filter assembly 100. In embodiments where no filter assembly 100 is included in the power head 108, the blower inlet 192 of the blower assembly 120 may be open to the discharge air port 228 directly.

As shown in FIGS. 2 and 6, each filter 116a, 116b of the filter assembly 100 is releasably attached to the filter housing 216 and includes a first end or opening 264a, 264b, a second end or opening 260a, 260b, and one or more filter elements 268a, 268b positioned fluidly between the first end 264a, 264b and the second end 260a, 260b. During use, air or other fluids may flow through each filter 116a, 116b in a first direction A or a second direction B. When flowing through a given filter 116a, 116b in the first direction A, air enters the filter 116a, 116b via the first end 264a, 264b, passes through the one or more filter elements 268a, 268b, and exits via the second end 260a, 260b (see FIG. 2). When flowing in the second direction B, air enters the filter 116a, 116b via the second end 260a, 260b, passes through the one or more filter elements 268a, 268b, and exits via the first end 264a, 264b (see FIG. 2).

The filter assembly 100 includes two filters 116a, 116b each having a single filter element 268a, 268b. Each filter 116a, 116b, in turn, is releasably mounted to the base wall 256 of the housing 216 such that the first end 264a, 264b of each filter 116a, 116b is open to the collection volume 124 of the container 112 (see FIGS. 2 and 6). In the illustrated embodiment, each filter 116a, 116b is releasably mounted to the base wall 256 of the housing 216 in a substantially horizontal orientation (i.e., parallel to the base wall 256) so that any dust or debris that is dislodged from the filter 116a, 116b (i.e., during the cleaning process) will more easily fall under the force of gravity into the collection volume 124.

As shown in FIGS. 8A and 8B, the filter assembly 100 also includes one or more filter control assemblies 220a 220b, each associated with and configured to at least partially control the flow of air through a corresponding filter 116a, 116b. Each filter control assembly 220a, 220b, in turn, includes a series of passages and valves that, together, selectively place and isolate the second end 260a, 260b of a corresponding filter 116a, 116b in fluid communication with the ambient air port 224 or the discharge air port 228. During use, each filter control assembly 220a, 220b is adjustable between a first or standard operating configuration, in which the second end 260a, 260b of the corresponding filter 116a, 116b is in fluid communication with the discharge port 228 and fluidly isolated from the ambient air port 224 (see first and second filter control assemblies 220a, 220b of FIG. 3A), and a second or cleaning configuration, in which the second end 260a, 260b of the corresponding filter 116a, 116b is in fluid communication with the ambient inlet port 224 and fluidly isolated from the discharge port 228 (see first filter control assembly 220a of FIG. 3B and second filter control assembly 220b of FIG. 3C). In the illustrated embodiment, the filter assembly 100 includes two filter control assemblies 220a, 220b, with each filter control assembly 220a, 220b being associated with the first and second filters 116a, 116b, respectively.

In the illustrated embodiment, the first filter control assembly 220a includes a first sub-chamber 272a at least partially encompassing and in fluid communication with the second end 260a of the first filter 116a, a first valve 276 positioned in and controlling the flow of fluid through the fluid passageway extending between the first sub-chamber 272a and the ambient air port 224, and a second valve 280 positioned in and controlling the flow of fluid through the fluid passageway extending between the first sub-chamber 272a and the discharge air port 228. More specifically, the illustrated first sub-chamber 272a completely encloses the second end 260a of the first filter 116a and forms a first valve seat 284, selectively engageable by the first valve 276 and establishing a fluid path between the first sub-chamber 272a and the ambient air port 224, and a second valve seat 288, selectively engageable by the second valve 280 and establishing a fluid path between the first sub-chamber 272a and the discharge air port 228.

As shown in FIG. 8A, the first valve 276 and the second valve 280 of the first filter control assembly 220a are mounted to a common central shaft 292 so that the two valves 276, 280 move together as a single unit. Specifically, the two valves 276, 280 define a first valve axis 296 along which the two valves 276, 280 travel axially between the first or standard operating configuration, in which the second valve 280 is in an open position (i.e., placing the first sub-chamber 272a in fluid communication with the discharge air port 228) and the first valve 276 is in a closed position (i.e., fluidly isolating the first sub-chamber 272a from the ambient air port 224), and the second or cleaning configuration, in which the second valve 280 is in a closed position (i.e., fluidly isolating the first sub-chamber 272a from the discharge air port 228) and the first valve 276 is in an open position (i.e., placing the first sub-chamber 272a in fluid communication with the ambient air port 224). In the illustrated embodiment, the first filter control assembly 220a also includes a biasing member 300 configured to bias the two valves 276, 280 into the standard configuration.

In the illustrated embodiment, the second filter control assembly 220b includes a second sub-chamber 272b at least partially encompassing and in fluid communication with the second end 260b of the second filter 116b, a third valve 304 extending between and in fluid communication with both the second sub-chamber 272b and the ambient air port 224, and a fourth valve 308 extending between and in fluid communication with both the second sub-chamber 272b and the discharge air port 228. More specifically, the illustrated second sub-chamber 272b completely encloses the second end 260b of the second filter 116b and forms a third valve seat 312, selectively engageable by the third valve 304 and establishing a fluid path between the second sub-chamber 272b and the ambient air port 224, and a fourth valve seat 316, selectively engageable by the fourth valve 308 and establishing a fluid path between the second sub-chamber 272b and the discharge air port 228.

As shown in FIG. 8B, the third valve 304 and the fourth valve 308 of the second filter control assembly 220b are mounted to a common central shaft 320 so that the two valves 304, 308 move together as a single unit. Specifically, the two valves 304, 308 define a second valve axis 324 along which the two valves 304, 308 travel axially between the first or standard operating configuration, in which the fourth valve 308 is in an open position (i.e., placing the second sub-chamber 272b in fluid communication with the discharge air port 228) and the third valve 304 is in a closed position (i.e., fluidly isolating the first sub-chamber 272b from the ambient air port 224), and a second or cleaning configuration, in which the fourth valve 308 is in a closed position (i.e., fluidly isolating the second sub-chamber 272b from the discharge air port 228) and the third valve 308 is in an open position (i.e., placing the second sub-chamber 272b in fluid communication with the ambient air port 224). In the illustrated embodiment, the second filter control assembly 220b also includes a biasing member 300 configured to bias the two valves 304, 308 toward the first position.

While the illustrated filter control assemblies 220a, 220b include disc valves using axial motion to engage and disengage the corresponding valve seats, it is understood that in other embodiments different types of valves may be used such as, but not limited to, butterfly valves, globe valves, knife valves, and the like (discussed below).

As shown in FIG. 11, the filter assembly 100 also includes a transition passageway 232 that extends between and provides a fluid conduit between the inlet passage 160 and the collection volume 124 of the collection container 112. In some embodiments, the transition passage 232 includes a first end 328, positioned proximate the second end 248 of the perimeter wall 240 (e.g., open to the power head connection interface) that is configured to form a seal (e.g., an air-tight seal) with the second end 180 of the inlet passage 160, and a second end 332 opposite the first end 328 that is positioned proximate the first end 244 of the perimeter wall 240 (e.g., open to the container connection interface) and therefore open to the collection volume 124.

In the illustrated embodiment, transition passageway 232 includes a body 336 positioned within the filter housing volume 252 having a first portion 340 forming the first end 328 that is substantially cylindrical in shape and oriented normal to the base wall 256, and a second portion 344 that extends outwardly perpendicular from the first portion 340 to form the second end 332 in the base wall 256. Together, the interface between the first portion 340 and the second portion 344 of the transition passageway 232 forms a portal or opening 350 (see FIG. 11).

The filter assembly 100 also includes a transition control assembly 236 that is configured to control the flow of gasses through the transition passage 232 during use. More specifically, the transition control assembly 236 includes a valve body 354 positioned within or otherwise incorporated into the transition passageway 232 that is adjustable between a first or open configuration, in which the first end 328 of the transition passage 232 is in fluid communication with the second end 332 of the transition passage 232 (i.e., the inlet passage 160 is in fluid communication with the collection volume 124), and a second or closed configuration, in which the first end 328 of the transition passage 232 is not in fluid communication with the second end 332 (i.e., the inlet passage 160 is not in fluid communication with the collection volume 124).

In the illustrated embodiment, the valve body 354 includes a cylindrical body nested within and rotatable with respect to the first portion 340 of the transition passageway 232. More specifically, the valve body 354 includes an opening 358 formed into the sidewall thereof that can be rotated into and out of alignment with the opening 350 of the transition passageway 232. During use, when the opening 358 of the valve body 354 is rotated into alignment with the opening 350 of the passageway 232 (see FIG. 11) the transition control assembly 236 is in the open configuration. In contrast, when the opening 358 of the valve body 354 is rotated out of alignment with the opening 350 of the passageway 232, the transition control assembly 236 in in the closed configuration.

As shown in FIGS. 9 and 10, the filter assembly 100 also includes a master control assembly 362 that is in operable communication with and configured to coordinate the operation of all filter control assemblies 220a, 220b and the transition control assembly 236. In some embodiments, the master control assembly 362 is configured to coordinate the operation of all filter control assemblies 220a, 220b, and the transition control assembly 236 without the use of any electrical power. In the illustrated embodiment, the master control assembly 362 is a purely mechanical device.

The master control assembly 362 includes one or more user inputs 366a, 366b that, through a series of linkages, gears, levers, and the like allow the user to manually manipulate and/or reverse the flow of air through each of the filters 116a, 116b and/or the transition passage 232. In some embodiments, the master control assembly 362 is configured to manually place the filter assembly 100 in a first or vacuum configuration (see FIG. 3A), or one of a plurality of filter cleaning configurations (see FIGS. 3B and 3C, discussed below). In still other embodiments, the user may adjust the filter assembly 100 from a standard cleaning or vacuuming configuration to a general cleaning configuration and then designate the specific filter 116a, 116b to be cleaned (i.e., the first filter cleaning configuration, see FIG. 3B, or the second filter cleaning configuration, see FIG. 3C).

The user inputs 366a, 366b of the master control assembly 362 includes two inputs, a vacuum unlock button 366a, and a filter designator knob 366b. The vacuum unlock 366a is configured to designate the overall operating condition of the transition control assembly 236 and selectively lock and unlock the filter designator 366b. More specifically, the vacuum unlock 366a is adjustable between a first position, in which the transition control assembly 236 is in the open configuration and the filter designator 366b is locked (i.e., cannot be adjusted, discussed below), and a second position, in which the transition control assembly 236 is moved to the closed configuration and the filter designator 366b is unlocked.

During operation, the size, shape, and layout of the two user inputs 366a and 366b are configured to influence the timing and manner in which the two inputs 366a 366b may be operated. In some embodiments, the inputs 366a, 366b are configured to require the actuation of the vacuum unlock button 366a (e.g., from the first position to the second position, discussed below) before the filter designator knob 366b can be operated (e.g., rotated from the first position into either the second position or the third position, discussed below). As such, the movements of the two inputs 366a, 366b result in a time delay between the moment when the vacuum unlock 366a is actuated and the moment when the filter designator 366b is actuated. The resulting time delay may then be used to influence the manner in which air flows through the filter assembly 100 during use (discussed below). In other embodiments, the master control assembly 362 is configured so that it first initiates adjustment of the transition control assembly 246 from the open configuration to the closed configuration before it initiates adjustment of either the first or second filter control assemblies 220a, 220b.

In the illustrated embodiment, the vacuum unlock 366a includes a spring-loaded button that moves axially between the first and second positions discussed above. The vacuum unlock 366a also includes a cammed mechanism 382 in operable communication with the vacuum unlock button 366a so that applying an axial force against the button 336a in the first direction C will cause the unlock button 366a to move from the first position to the second position and then remain locked in the second position by the cammed mechanism 382 against the force of a biasing member 384. The cammed mechanism 382 is further configured so that a subsequent application of an axial force against the button 366a in the first direction C will cause the unlock button 366a to unlock and return to the first position via a biasing force provided by the biasing member 384 and remain locked in the first position until acted upon again.

The vacuum unlock 366a further includes a linkage 386 that is coupled to the button 366a for axial movement together therewith. The linkage 386, in turn, includes a locking groove 390 formed therein to selectively engage a locking pawl 394 of the filter designator 366b. More specifically, when the button 366a is in the first position, the linkage 386 is positioned such that the locking pawl 394 of the filter designator 366b is positioned within the locking groove 390 thereby restricting any rotational motion of the filter designator 366b relative to the housing 216. In contrast, when the button 366a is in the second position, the linkage 386 is translated in the first direction C a sufficient distance so that the locking pawl 394 is not positioned within the locking groove 390 and the filter designator 366b is free to rotate relative to the housing 216.

The linkage 386 also includes a connection interface 396 with the valve body 354 of the transition control assembly 236 that is configured so that the axial movement of the linkage 386 causes the valve body 354 to rotate with respect to the first portion 340 of the transition passage 232. More specifically, the linkage 386 and connection interface 396 are configured so that when the button 366a is in the first position the valve body 354 is positioned so the opening 358 of the valve body 354 is aligned with the opening 350 of the passageway 232 (i.e., the transition control assembly 236 is in the open configuration). Alternatively, the linkage 386 and connection interface 396 are configured so that when the button 366a is in the second position, the valve body 354 is positioned so that its opening 358 is not aligned with the opening 350 of the passageway 232 (i.e., the transition control assembly 236 is in the closed configuration).

The filter designator 366b of the master control assembly 362 is configured to coordinate and control the operating conditions of the first and second filter control assemblies 220a, 220b. More specifically, the filter designator 366b is adjustable between a first or vacuum position, in which both filter control assemblies 220a, 220b are in the standard position (see FIG. 3A), a second or first filter select position, in which the first filter control assembly 220a is in the clean position while the second filter control assembly 220b is in the standard position (see FIG. 3B), and a third or second filter select position, in which the first filter control assembly 220a is in the standard position while the second filter control assembly 220b is in the clean position (see FIG. 3C).

The filter designator knob 366b is rotatable about a knob axis 404 with respect to the housing 216 between the first, second, and third positions as described above. In the illustrated embodiment, the first position is when the indicator 408 of the knob 366b is at the upright, 12 o'clock location, the second position is when the indicator 408 of the knob 366b is at the right, 3 o'clock location, and the third position is when the indicator 408 of the knob 366b is at the left, 9 o'clock location. However, in other embodiments different indicator 408 locations may represent different positions.

The filter designator 366b also includes a main shaft 412 coupled to and rotatable together with the knob 366b about the knob axis 404, a locking pawl 394 extending from the main shaft 412, and a primary gear 416 fixedly coupled to the main shaft 412 opposite the knob 366b for rotation about the knob axis 404 together therewith.

As discussed above, the locking pawl 394 of the filter designator 366b is sized and shaped to be selectively received within a corresponding locking groove 390 of the vacuum unlock 366a. As such, when the locking pawl 394 is positioned within the locking groove 390 (i.e., the button 366a is in the first position) the knob 366b is rotationally fixed relative to the housing 216. In contrast, when the locking pawl 394 is not positioned within the locking groove 390 (i.e., the button 366a is in the second position) the knob 366b is free to rotate between the first, second, and third positions. In the illustrated embodiment, the locking pawl 394 is positioned so that it will lock the knob 366b in the first position (i.e., with the indicator 408 at the 12 o'clock position) when the button 366a is in the first position. By doing so, the locking pawl 394 assures that the use does not inadvertently place the knob 366b in a cleaning configuration without having first adjusted the transition control assembly 236 into the closed configuration.

The filter designator 366b also includes a control rack 420, a first filter drive gear 424, a second filter drive gear 428, a first filter lever arm 432, and a second filter lever arm 436. The control rack 420, in turn, is an elongated beam movably coupled to the housing 216 for lateral translational movement relative thereto. The control rack 420 includes a first set of gear teeth 440 configured to mesh with the primary gear 416, a second set of gear teeth 444 configured to selectively mesh with the first filter drive gear 424, and a third set of gear teeth 448 configured to selectively mesh with the second filter drive gear 428. In the illustrated embodiments, the teeth 440, 444, 448 of the control rack 420 are positioned such that the first set of gear teeth 440 engage the primary gear 416 over the entire range of motion of the control rack 420, the second set of gear teeth 444 only engage with the first filter drive gear 424 when the knob 366b is positioned between the first position and the second position, and the third set of gear teeth 448 only engage with the second filter drive gear 428 when the knob 366b is positioned between the first position and the third position.

During use, when the knob 366b is in the first position, the control rack 420 is centered about its range of motion. When the user rotates the knob 366b from the first position to the second position (i.e., rotating the knob 366b in a first or clockwise direction D from the 12 o'clock position to the 3 o'clock position), the corresponding rotation of the primary gear 416 causes the rack 420 to translate in a first direction E, whereby the second set of gear teeth 444 engage the first filter drive gear 424 causing it to rotate in a first direction F (e.g., clockwise). Returning the knob 366b to the first position (i.e., rotating the knob 366b in a second or counter-clockwise direction G from the 3 o'clock position to the 12 o'clock position) causes the rack 420 to translate back toward its centered position in a second direction H, whereby the second set of gear teeth 444 engage and rotate the first filter drive gear 424 in a second direction J (e.g., counterclockwise). Note that the second filter drive gear 428 is not rotated during the above-described actions between the first and second positions as the third set of teeth 448 do not engage the gear 428 over this range of motion.

When the user rotates the knob 366b from the first position to the third position (e.g., rotating the knob 366b in a second or counter-clockwise direction G from the 12 o'clock position to the 9 o'clock position), the corresponding rotation of the primary gear 416 causes the rack 420 to translate in a second direction H, whereby the third set of gear teeth 448 engage the second filter drive gear 428 causing it to rotate in a first direction K (e.g., counterclockwise). Returning the knob 366b to the first position (e.g., rotating the knob 366b in a first or clockwise direction D from the 9 o'clock position to the 12 o'clock position), the corresponding rotation of the primary gear 416 causes the rack 420 to translate back toward its center position in the first direction E, whereby the third set of gear teeth 448 engage and rotate the second filter drive gear 428 in a second direction L (e.g., clockwise). Note that the first filter drive gear 424 is not rotated during the above-described actions between the first and third positions as the second set of teeth 444 do not engage the gear 424 over this range of motion.

The first filter lever arm 432 is an elongated member having a first end 452a coupled to the first filter control assembly 220a (i.e., to the interconnected first and second valves 276, 280), a second end 456a opposite the first end 452a that forms a set of gear teeth 460a configured to mesh with the first filter drive gear 424, and a pivot point 464a between the first end 452a and the second end 456a. During operation, the lever arm 432 is sized and shaped so that rotation of the drive gear 424 in the first direction F (i.e., clockwise) causes the arm 432 to bias the valves 276, 280 toward the cleaning position. Alternatively, the lever arm 432 is also sized and shaped so that rotation of the drive gear 424 in the second direction J (i.e., counterclockwise) causes the arm 432 to bias the valves 276, 280 toward the standard position. In the illustrated embodiment, the lever 432 is mounted within the housing 216 so that the pivot point 464a and first end 452a are positioned on one side of a central longitudinal axis 468 while the second end 456a is positioned on the opposite side of the central axis 468.

The second lever arm 436 is an elongated member having a first end 452b coupled to the second filter control assembly 220b (i.e., to the interconnected third and fourth valves 304, 308), a second end 456b opposite the first end 452b that forms a set of gear teeth 460b configured to mesh with the second filter drive gear 428, and a pivot point 464b between the first end 452b and the second end 456b. During operation, the lever arm 436 is sized and shaped so that rotation of the drive gear 428 in the first direction K (i.e., counterclockwise) causes the arm 436 to bias the valves 304, 308 toward the cleaning position. Alternatively, the lever arm 436 is also sized and shaped so that rotation of the drive gear 428 in the second direction L (i.e., clockwise) causes the arm 436 to bias the valves 304, 308 toward the standard position. In the illustrated embodiment, the lever 436 is mounted within the housing 216 so that the pivot point 464b and first end 452b are positioned on one side of the central axis 468 while the second end 456b is positioned on the opposite side of the central axis 468.

Together, the first lever arm 432 and the second lever arm 436 are positioned within the housing 216 so that they cross-over each other, such that the first end 452a and pivot point 464a of the first arm 432 are on the same side of the central axis 468 as the second end 456b of the second arm 436. Furthermore, the first end 452b and pivot point 464b of the second arm 436 are on the same side of the central axis 468 as the second end 456a of the first arm 432.

To operate the vacuum assembly 104, the user first installs the filter assembly 100 between the power head 108 and the collection container 112. To do so, the user aligns the first end 244 of the filter housing 216 with the open end 184 of the container 112 and brings the filter assembly 100 and the collection container 112 together. The filter assembly 100 and the collection container 112 are then secured using the corresponding coupling elements 148. Once attached, the collection volume 124 of the container 112 is at least partially enclosed by the container 112 and the base wall 256 of the filter assembly 100. Furthermore, the first ends 264a, 264b of both filters 116a, 116b and the second end 332 of the transition passage 232 are all open to and in fluid communication with the collection volume 124.

The user may then install the power head 108 atop the filter assembly 100. To do so, the user aligns the second end 248 of the filter housing 216 with the base wall 168a of the power head housing 152 and brings the two elements 100, 108 together. The two elements 100, 108 are then secured using the corresponding coupling elements 148. Once attached, the second end 180 of the inlet passage 160 forms an air-tight connection with the first end 328 of the transition passageway 232 and the blower inlet 192 is in fluid communication with the discharge air port 228.

With the vacuum assembly 104 assembled, the user may then operate the vacuum in a standard vacuum configuration. To do so, the user places the vacuum unlock button 366a in the first position resulting in the transition control assembly 236 being placed in the open configuration and the filter designator knob 366b being locked in the first position. With the filter designator knob 366b being locked in the first position, both filter control assemblies 220a, 220b are in the standard configuration.

With the vacuum in the vacuum configuration, the user may then activate the blower assembly 120 (i.e., turn on the vacuum 104) causing dust and debris laden air to be drawn into the collection volume 124 via the inlet passage 160. Upon entering the collection volume 124, any large debris is separated from the airflow and deposited therein. The semi-treated air then flows in parallel fashion through both the first and second filters 116a, 116b in a first direction A. By doing so, the air is treated further where finer dust and debris is removed from the airflow via the filter elements 268a, 268b.

After being treated by the filter elements 268a, 268b, the treated airflow then continues into the discharge air port 228 where the parallel flows recombine and are drawn into the blower assembly 120 itself via the blower inlet 192. Finally, the airflow is exhausted to the atmosphere via the blower outlet 200.

Over time, operating the vacuum 104 in the vacuum configuration may cause one or both filters 116a, 116b to become saturated with dust and/or debris. To remedy this situation, the user may operate the vacuum 104 in either the first filter cleaning configuration or the second filter cleaning configuration to clean the first or second filters 116a, 116b, respectively without having to disassemble the vacuum 104 or otherwise access the filters 116a, 116b directly.

To place the vacuum 104 in the first filter cleaning configuration while the blower assembly 120 continues to operate, the user first places the vacuum unlock button 366a in the second position by applying a force against the button 366a in the first direction C. Once the button 366a is locked in the second position, the vacuum 104 is in a general cleaning configuration whereby the filter designator knob 366b is unlocked and the transition control assembly 236 is placed in the closed configuration.

From the general cleaning configuration, the user may then select which of the two filters 116a, 116b he or she would like to clean. To place the vacuum in the first filter cleaning configuration from the general cleaning configuration (i.e., to clean the first filter 116a), the user rotates the knob 366b into the second position (e.g., rotates the knob 366b from the 12 o'clock position to the 3 o'clock position). By doing so, the knob 366b places the first filter control assembly 220a in the clean configuration while maintaining the second filter control assembly 220b in the standard configuration.

With the vacuum 104 in the first filter cleaning configuration, fresh air is drawn into the vacuum 104 via the ambient air port 224. The fresh air then travels to the first filter 116a where it passes through the filter 116b in the second direction B. By flowing through the filter in the second, reverse direction B, the dust and debris lodged into the filter element 268a during normal vacuum operations (e.g., deposited by air flowing through the filter in the first direction A) will become dislodged therefrom where it may be collected within the collection volume 124.

As stated above, the layout of the inputs 366a, 366b of the filer assembly 100 result in a time delay from the moment the transition control assembly 236 enters the closed configuration and the moment the first filter control assembly 220a transitions into the clean configuration. During this delay, the pressure differential between the collection volume 142 and the surrounding atmosphere begins to increase. This pressure differential increases in time until reaching a pre-determined maximum based at least in part on the performance capabilities of blower assembly 120 being used. The increased pressure differential, in turn, permits a surge of air to pass through the system first filter control assembly 220a enters the clean configuration.

After passing through the first filter 116a, the airflow then flows through the second filter 116b in the first direction A. To the extent any find dust or debris remains in the airflow at this point, it will be treated as it passes through the second filter 116b.

The fully treated air then continues into the discharge air port 228 where the airflow is drawn into the blower assembly 120 itself via the blower inlet 192 and subsequently exhausted to the atmosphere via the blower outlet 200. The user can continue to operate the vacuum 104 in the first filter cleaning configuration for as long as deemed necessary to sufficiently clean the first filter 116a.

After cleaning the first filter 116a, the user may subsequently clean the second filter 116b by placing the vacuum 104 in the second filter cleaning configuration. To do so, the user rotates the knob 366b from the second position, through the first position, and into the third position (e.g., rotates the knob 366b from the 3 o'clock position to the 9 o'clock position). By doing so, the knob 366b first returns the first filter control assembly 220a to the standard configuration and then places the second filter control assembly 220b in the clean configuration. By doing so, the filter assembly 100 momentarily enters the general cleaning configuration (e.g., as the knob 366b passes through the first position) whereby the pressure differential is again allowed to increase as discussed previously before entering the second filter cleaning configuration.

With the vacuum 104 in the second filter cleaning configuration, fresh air is drawn into the vacuum 104 via the ambient air port 224. The fresh air then travels to the second filter 116b where it passes through the filter 116b in the second direction B. By flowing through the filter in the second, reverse direction B, the dust and debris lodged into the filter element 268b during normal vacuum operations (e.g., deposited by air flowing through the filter in the first direction A) will become dislodged therefrom where it may be collected within the collection volume 124. Similar to above, the time spent in the general cleaning configuration while transitioning from the first filter cleaning configuration to the second cleaning configuration generates an airflow surge to increase the cleaning capacity of the filter cleaner 100.

After passing through the second filter 116b, the airflow then flows through the first filter 116a in the first direction A. To the extent any find dust or debris remains in the airflow at this point, it will be treated as it passes through the first filter 116a.

The T fully treated air then continues into the discharge air port 228 where the airflow is drawn into the blower assembly 120 itself via the blower inlet 192 and subsequently exhausted to the atmosphere via the blower outlet 200. The user can continue to operate the vacuum 104 in the second filter cleaning configuration for as long as deemed necessary to sufficiently clean the second filter 116b.

After cleaning operations are complete, the user may then return the vacuum 104 to vacuum configuration. To do so, the user first returns the filter designator knob 366b to the first position (i.e., rotates the knob 366b into the 12 o'clock position). With the knob 366b in position, the user may then return the vacuum unlock 366a to the first position by applying a force against the button in a first direction C whereby the button 366a will return to the first position. By doing so, the transition control assembly 236 returns to the open configuration and the knob 366b becomes locked in the first position (i.e., locking both filter control assemblies 220a, 220b in the standard configuration).

FIGS. 13 and 14 illustrate another embodiment of the filter assembly 1000. The filter assembly 1000 is substantially similar to the filter assembly 100 described above so reference is made to the above disclosure of the filter assembly 100. The differences as well as additional features of the filter assembly 1000 will be described in detail herein. The master control assembly 1362 of the filter assembly 1000 includes a single user input 1366 configured to coordinate and determine the operational status of the transition control assembly 1236, and both filter control assemblies 1220a, 1220b. More specifically, the single user input 1366 includes a rotatable knob 1366 that is rotatable about a knob axis 1404 between a first position, in which the filter assembly 1000 is in the vacuum configuration, a second position, in which the filter assembly 1000 is in the first filter cleaning configuration, and a third position in which the filter assembly 1000 is in the second filter cleaning configuration.

In the illustrated embodiment, an indicator of the knob 1366 is in the 12 o'clock position when the filter assembly 1000 is in the vacuum configuration, the indicator of the knob 1366 is in the 3 o'clock position when the filter assembly 1000 is in the first filter cleaning configuration, and the indicator of the knob 1366 is in the 9 o'clock position when the filter assembly is in the second filter cleaning configuration.

The single user input 1366 also includes a biasing member 1500 that is configured to bias the knob 1366 toward the first position. As such, the user can rotate the knob 1366 manually into one of the second or third positions whereby releasing the knob 1366 causes the knob 1366 to automatically rotate back to the first position. By doing so, the user is able to quickly clean one or both filters 1116a, 1116b during operation of the vacuum 104.

For example, the user may begin operation of the vacuum 104 with the knob 1366 in the first position. As such, the transition control assembly 1236 is in the open configuration while both filter control assemblies 1220a, 122b are in the standard configurations. With the blower assembly 120 in operation (i.e., the vacuum 104 is on) air fill flow through both filters 1116a, 1116b as indicated in FIG. 3A.

As the blower assembly 120 remains in operation, the user may then temporarily rotate the knob 1366 into one of the second position or the third position. If rotating the knob 1366 into the second position (i.e., the 3 o'clock position), the rotation of the knob 1366 simultaneously causes the transition control assembly 1236 to rotate into the closed configuration while the first filter control assembly 1220a transitions into the clean configuration. As this transition occurs with the blower assembly 120 operating, the flow path through the vacuum shifts from the path shown in FIG. 3A to the path shown in FIG. 3B resulting in the airflow traveling through the first filter 1116a in the second direction B to dislodge dust and debris therefrom.

The user may then manually hold the knob 1366 in the second position for as long as needed to clean the filter 1116a whereby the user can then release the knob 1366 causing automatically return to the first position by way of the biasing member 1500. The knobs 1366 return to the first position then causes the airflow to return to the original vacuum configuration as the blower assembly 120 continues to operate. In some configurations, the biasing member 1500 can be omitted such that the knobs 1366 are returned to the first position by a user manually moving the knobs 1366.

In the illustrated embodiment, the knob 1366 includes a main shaft 1412 with a primary gear 1416 attached for rotation together therewith to operate in a similar manner as the primary gear 416 and master control assembly 362 described above. The knob 1366 also includes a connection interface 396 to transmit the rotation of the knob 1366 to the valve body 1354 so that rotation of the knob 1366 from the first position (i.e., the 12 o'clock position) to either one of the second position (i.e., the 3 o'clock position) or the third position (i.e., the 9 o'clock position) will cause the valve body 1354 to rotate from its open position to a closed position.

FIGS. 15-20 illustrate another embodiment of the filter assembly 2000. The filter assembly 2000 is substantially similar to the filter assembly 100 described above so reference is made to the above disclosure of the filter assembly 100. The differences as well as additional features of the filter assembly 2000 will be described in detail herein. Each filter control assembly 2220a, 2220b includes a common shaft 2508a, 2508b with a first butterfly valve 2500 and a second butterfly valve 2504 mounted thereon. As shown in FIGS. 15 and 21, the first butterfly valve 2500 of each shaft 2508 is configured to selectively control the flow of fluids between a corresponding filter 2116a, 2116b and the ambient air port 2224 while the second butterfly valve 2504 is configured to selectively control the flow of fluids between the corresponding filter 2116a, 2116b and the discharge air port 2228.

In the illustrated embodiment, the valves 2500, 2504 are mounted to the shaft 2508 in a skewed manner (i.e., approximately 90 degrees apart; see FIG. 21) so that when the first butterfly 2500 is in a closed configuration the second butterfly 2504 is in an open configuration, and vise-versa. As such, rotation of each common shaft 2508a, 2508b with respect to the housing 2216 adjusts each filter control assembly 2220a, 2220b between the standard configuration (i.e., where a given filter is in fluid communication with the discharge air port 2228 but not in fluid communication with the ambient air port 2224), and the cleaning configuration (i.e., where a given filter is in fluid communication with the ambient air port 2224 and not the discharge air port 2228).

During use, the master control assembly 2362 of the filter assembly 2000 includes a series of linkages 2512 coupled to each shaft 2508a, 2508b that are sized and shaped to coordinate the opening and closing of the corresponding butterfly valves 2500, 2504 in both filter control assemblies 2220a, 2220b. More specifically, the linkages 2512 each include a corresponding slot 2516a, 2516b formed therein to at least partially designate the manner in which the two shafts 2508a, 2508b are operated. For example, the slot 2516a formed into the first linkage 2512a is sized and shaped (e.g., extending counter-clockwise from the neutral position) such that the linkage will only transmit forces to the shaft 2508a if the input is in the counter-clockwise direction as viewed in FIG. 19. In contrast, the slot 2516b formed into the second linkage 2512b is sized and shape (e.g., extending clockwise from the neutral position) such that the linkage will only transmit forces to the shaft 2508b if the input is in the clockwise direction as viewed in FIG. 19.

Together, the two linkages 2512a, 2512b are configured so that if no manual rotational input is provided (e.g., the input remains in the neutral position as shown), both filter control assemblies 2220a, 2220b will remain in the standard configuration. In contrast, if the input is rotated in a clockwise direction as viewed in FIG. 19, only the second control assembly 2220b and second shaft 2508b will be rotated from the standard configuration into the clean configuration. Still further, if the input is counter-clockwise in nature as viewed in FIG. 19, only the first control assembly 2220a and the first shaft 2508a will be changed from the standard configuration to the cleaning configuration.

FIG. 18 illustrates a third linkage 2512c configured to transmit force to a third butterfly valve 2506 from the same input as discussed above. The third butterfly valve 2506 being configured to selectively open and close the intermediate passage 2232.

FIGS. 22-24 illustrates another embodiment of the filter assembly 3000. The filter assembly 3000 is substantially similar to the filter assembly 100 described above so reference is made to the above disclosure of the filter assembly 100. The differences as well as additional features will be discussed in detail herein. Although only a single filter control assembly 3220a is shown, both control assemblies 3220a, 3220b include a series of sliding valves. More specifically, the first filter control assembly 3220a includes a first valve plate 3500 configured to selectively cover a valve seat 3504 extending between the first filter 3116a and the discharge air port 3228, and a second valve plate 3508 configured to selectively cover a valve seat 3512 extending between the first filter 3116a and the ambient air port 3224. In the illustrated embodiment, the two valve plates 3500, 3508 are coupled together by an elongated linkage 3516 so that translational movement of the first filter control assembly 3220a in a first direction A causes the first valve seat 3504 to be opened and the second valve seat 3512 to be closed. In contrast, movement of the first filter control assembly 3220a in a second direction B opposite the first direction A causes the first valve seat 3504 to be closed and the second valve seat 3512 to be opened. While not shown, a similar layout and operation would also be present for the second filter control assembly 3220b.

The filter assembly 3000 also includes an inlet slide valve 3600. The slide vale 3600 is configured so that when it is translated in the first direction A the valve 3600 is in an open configuration while translational movement of the slide valve 3600 in the second direction B places the slide vale 3600 in a closed configuration.

Still further, the filter assembly 3000 also includes a control knob 3700 rotatably coupled to the slide valve 3600. During operation, the control knob 3700 may be rotated (e.g., either clockwise or counterclockwise direction, and/or translated in the first and second directions A/B. In the illustrated embodiment, the knob 3700 includes a pair of control arms 3704 extending radially outwardly therefrom that selectively engage either the first filter control assembly 3220a or the second filter control assembly 3220b. To make a selection, the user may either rotate the knob 3700 in a clockwise direction, whereby the control arms 3704 will couple with the first filter control assembly 3220a, or rotate the knob 3700 in a counterclockwise direction, whereby the control arms 3704 will couple with the second filter control assembly 3220b (not shown). Once a side is selected (e.g., by rotating the knob 3700), the user may then translate the knob 3700 in the first direction A or the second direction B whereby the slide valve 3600, the selected filter control assembly 3220a, 3220b, and the knob 2700 will all travel together as a unit. In contrast, the unselected filter control assembly 3220a, 3220b will remain stationary.

For example, as shown in FIG. 22, the user has rotated the knob 3700 so that the control arm 3704 is coupled with the first control assembly 3220a, such that when they translated the knob 3700 in the first direction B, both the first control assembly 3220a and the slide vale 3600 moved together therewith.

FIGS. 25-37 illustrate another embodiment of the filter assembly 4100. The filter assembly 4100 is substantially similar to the filter assembly 100 described above so reference is made to the above disclosure of the filter assembly 100. Additional features described herein for the filter assembly 4100 also apply to the filter assembly 100, as well as the filter assemblies 1000, 2000 and 3000 described herein.

The ambient air port 4224 of the filter assembly 4100 includes an access point permitting the ingress of clean, ambient air into the flow path of the filter assembly 4100. More specifically, the illustrated ambient air port 4224 provides a fluid passage between the second end 260a, 260b of each of the filters 116a, 116b and the exterior of the vacuum assembly 104 through which clean, ambient air may be drawn into the filter assembly 4100 for the filter cleaning process.

In the illustrated embodiment, the ambient air port 4224 includes a compartment 4500 extending the width of the housing 4216 such that single compartment 4500 is in selective fluid communication with both the first sub-chamber 272a and the second sub-chamber 272b (i.e., via the first valve 276 and the third valve 304, respectively). Furthermore, the ambient air port 4224 includes a pair of grates 4504a, 4504b formed into the perimeter wall 4240 on opposite sides thereof to place the compartment 4500 in fluid communication with the exterior of the filter assembly 4100.

The discharge air port 4228 of the filter assembly 4100 provides a fluid passage between the second end 260a, 260b of each of the filters 116a, 116b and the inlet 192 of the blower assembly 120. The discharge air port 4228 includes a chamber 4230 at least partially defined by the housing 4216 of the filter assembly 4100 and that is in fluid communication with the inlet 192, the second end 260a of the first filter 116a, and the second end 260b of the second filter 116b.

In the illustrated embodiment, the discharge air port 4228 includes a debris cage 4508 at least partially positioned therein. During use, the debris cage 4508 is configured to serve as a supplemental coarse filter downstream of the filters 116a, 116b to assure that any debris that may get behind the filters 116a, 116b is not drawn into the blower 120. Specifically, the debris cage 4508 includes is substantially cylindrical in shape having an open top end 4512 configured to engage with the inlet 192 of the blower assembly 120. The side walls of the cage 4508 include a series of apertures 4516 formed therein that are covered with a grating or coarse filtering material. During use, air flows through the apertures 4516 and into the blower inlet 192 (i.e., via the top end 4512) such that any remaining debris within the airflow is filtered out via the grating of the apertures 4516.

In addition to the cage 4508 and the filters 116a, 116b, various other filter options can be utilized. Since the filter assembly 4100 is installed between the power head 108 and the collection container 112, the filter 204 that is typically attached to the power head 108 may be removed when the filter assembly 4100 is in place. In such instances, the power head filter 204 could be duplicative and the performance of the vacuum assembly 104 may be inadequate if both the power head filter 204 and the filter assembly 4100 were utilized together in series. In order to ensure that the power head filter 204 is removed, the geometry of the filter assembly 4100 may be sized such that the power head filter 204 does not physically fit when the filter assembly 4100 is attached to the power head 108. As such, the geometry of the filter assembly 4100 assures the power head filter 204 is removed before attachment of the filter assembly 4100 can occur. In the illustrated embodiment, the debris cage 4508 is sized so that the power head filter 204 does not fit therein and therefore must be removed before the power head 108 and filter assembly 4100 can be attached. In other embodiments, a beam or other geometric element may extend across or protrude into the chamber 230 of the discharge port 228 to inhibit the power head filter 204 from being inserted therein and requiring its removal before attachment of the filter assembly 4100 can occur. In alternative embodiments, the filter assembly 4100 may be configured so that the filter 204 of the power head 108 may remain in place to serve as a second filter in series with the filters 116a, 116b of the filter assembly 4100. In such embodiments, the filtering characteristics of the filters 116a, 116b may be modified to exert less resistance on the flow of the air passing therethrough so that both filers can be used without exerting too large a load on the device.

In the event that the user removes one or both of the filters 116a, 116b or inadequately installs one or both of the filters 116a, 116b, a coarse filter may be incorporated into to filter assembly 4100 to protect the power head 108 from ingesting coarse debris and potentially damaging the blower assembly 4120. In some embodiments, the coarse filter may include the debris cage 4508. The debris cage 4508 can be positioned between the collection container 112 and the power head 108 to inhibit large debris from passing from the collection container 112 into the power head 108 in the event that the filters 116a, 116b are not properly positioned. In other embodiments, the debris cage 4508 is coupled to the filter assembly 4100 (see FIG. 30A). In still other embodiments, the debris cage 4508a may be coupled to the power head 108 either in addition to or in lieu of the debris cage 4508 (see FIG. 30B). In still other embodiments, the coarse filter may include a nylon bag 4508b that is coupled to the power head 108 in place of the standard power head filter (see FIG. 30C).

In still other embodiments, the coarse filter may include a screen or mesh incorporated into the filter 116a, 116b mounting locations. For example, the coarse filter 116c is positioned immediately upstream of filter 116a and coarse filter 115d is positioned immediately upstream of filter 116b. The coarse filters 116c, 116d act as a safeguard in the event that the user does not properly install the filters 116a, 116b. The coarse filters 116c, 116d can be used in conjunction with any of the debris cages 4508a, 4508a, 4508b for added protection.

As shown in FIGS. 33-34, the filter assembly 4100 also includes a transition passageway 4232 that extends between and provides a fluid conduit between the inlet passage 160 and the collection volume 124 of the collection container 112. More specifically, the transition passage 4232 includes a first end 4328, positioned proximate the second end 4248 of the perimeter wall 4240 that is configured to configured to form an air-tight seal with the second end 180 of the inlet passage 160, and a second end 4332 opposite the first end 4328 that is open to the collection volume 124. The transition passage 4232 also defines a passage axis 4520 extending along the passage between the first end 4328 and the second end 4332.

The filter assembly 4100 also includes a transition control assembly 4236 that is configured to control the flow of gasses through the transition passage 4232 during use. More specifically, the transition control assembly 4236 includes a valve 4524 positioned within the passageway 4232 that is movable between a first or open position, in which the first end 4328 of the transition passage 4232 is in fluid communication with the second end 4332 of the transition passage 4232 (i.e., the inlet passage 160 is in fluid communication with the collection volume 124 via the passage 4232), and a second or closed configuration, in which the first end 4328 of the passageway 4232 is not in fluid communication with the second end 4332 of the passageway 4232 (i.e., the inlet passage 160 is not in fluid communication with the collection volume 124 via the passage 4232).

In the illustrated embodiment, the valve 4524 includes a gate 4528 that is pivoted about a valve axis 4532 at one end thereof such that the gate 4528 pivots about the valve axis 4532 between the open position (e.g., in which air can flow through the transition passage 4232) and closed position (e.g., in which the flow of air through the transition passage 4232 is at least partially blocked by the gate 4528 relative to the open position). As shown in FIG. 33, the valve axis 4532 is oriented perpendicular to the passage axis 4520. Furthermore, the location of the valve axis 4532 is such that when the gate 4528 is in the open position, the gate 4538 extends downstream from the valve axis 4532 (i.e., toward the second end 4332, see gate 4538). In some embodiments, the gate 4538 extends vertically downwardly from the valve axis 4532 in the open position. In such embodiments, the layout of the gate 4538 allows debris that may have accumulated on the upstream side of the gate 4538 to fall into the collection volume 124 of the collection container 112 upon opening.

During use, the gate 4528 is in operable communication with the vacuum unlock lever 4366a such that actuation of the unlock lever 4336a causes the gate 4528 to rotate between the open position to the closed position. As illustrated in FIG. 33 the rotational direction of the gate 4538 is clockwise or downward to move to the open position and counterclockwise or upward to move to the closed position. The open position is utilized during normal cleaning operation and the closed position is utilized during the filter cleaning operation.

More specifically, the valve 4524 is configured so that the angular offset between the open position and the closed position of the gate 4528 is less than the angular offset between the first position and the second position of the unlock lever 4366a. By doing so, the gate 4528 is configured so that the gate 4528 will be biased into its seat 4536 when in the closed position due to the relatively larger rotation of the unlock lever 4366a.

In the illustrated embodiment, the unlock lever 4366a has an angular offset of approximately 90 degrees while the gate 4528 has an angular offset of approximately 88 degrees (e.g., ±1%, ±2%, ±5%, ±10%). In still other embodiments, the unlock lever 4366a has an angular offset of approximately 90 degrees while the gate 4528 has an angular offset between approximately 84.9 degrees and approximately 88.4 degrees (±1%, ±2%, ±5%, ±10%). In still other embodiments, the unlock lever 4366a has an angular offset of approximately 90 degrees while the gate 4528 has an angular offset between approximately 84 degrees and approximately 89 degrees (±1%, ±2%, ±5%, ±10%). In still other embodiments, the unlock lever 4366a has an angular offset of approximately 90 degrees while the gate 4528 has an angular offset between approximately 80 degrees and approximately 89 degrees (±1%, ±2%, ±5%, ±10%). In still other embodiments, the angular offset of the unlock lever 4366a is between 1.5 and 6 degrees greater than the angular offset of the gate 4528. In still other embodiments, the angular offset of the unlock lever 4366a is between 1 and 10 degrees greater than the angular offset of the gate 4528. In still other embodiments, the angular offset of the unlock lever 4366a is between 4.5 and 5.5 degrees greater than the angular offset of the gate 4528. In still other embodiments, the angular offset of the unlock lever 4366a is between 1 degree and 2 degrees greater than the angular offset of the gate 4528.

In some embodiments, the size and shape of the gate 4528 of the valve 4524 may be altered so that the resonant frequency of the gate 4528 falls outside the resonant frequencies present during operation of the filter assembly 4100. For example, in some embodiments the gate 4528 may include one or more ribs, such as rib 4336, or other reinforcement elements incorporated therein. In still other embodiments, the gate 4528 may include added weight or ballast. In still other embodiments, the thickness of the gate 4528 may be variable across a width of the gate 4528. One or more ribs 4336, or other reinforcement structure or additional features can be included on the gate 4528 to change the weight and/or thickness of the gate 4528 to thereby reduce vibration of the gate 4528 during operation.

As shown in FIGS. 32 and 34-36, the filter assembly 4100 also includes a master control assembly 4362 that is in operable communication with and configured to coordinate the operation of all filter control assemblies 4220a, 422b and the transition control assembly 4236. The master control assembly 4362 includes one or more user inputs 4366a, 4366b that, through a series of linkages, cammed surfaces, and the like, allow the user to manually place the filter assembly 4100 in a first or vacuum configuration, a general cleaning configuration, a first filter cleaning configuration, and a second filter cleaning configuration.

The user inputs 4366a, 4366b of the master control assembly 4362 includes two inputs, a vacuum unlock lever 4366a, and a filter designator 4366b (FIG. 37A). The vacuum unlock lever 4366a is configured to designate the overall operating condition of the transition control assembly 4236 and selectively lock and unlock the filter designator 4366b. More specifically, the vacuum unlock lever 4366a is adjustable between a first position (A), in which the transition control assembly 4236 is in the open configuration and the filter designator 4366b is locked (i.e., cannot be adjusted, discussed below), and a second position (B), in which the transition control assembly 4236 is in the closed configuration and the filter designator 4366b is unlocked (see FIG. 37B).

In the illustrated embodiment, the vacuum unlock lever 4366a includes an elongated lever pivotably mounted to the perimeter wall 4240 at one end thereof. The vacuum unlock lever 4366a also includes a locking mechanism 4542 formed into the distal end 4544 thereof that is configured to selectively engage both the filter designator 4366b and a stop 4546 formed in the perimeter wall 4240. More specifically, the locking mechanism 4542 includes a detent 4548 that extending radially outwardly from the lever 4366a and that can be retracted manually by the user via a button 4552.

When the lever 4366a is in the first position (A), the detent 4548 of the locking mechanism 4542 extends radially outwardly from the distal end 4544 of the lever 4366a and is received within a corresponding recess of the filter designator 4366b. By doing so, the locking mechanism 4542 both retains the lever 4366a in the first position (A), and locks the filter designator in the first position (i.e., the upright, 12 o'clock position, discussed below). After the user retracts the detent 4548 via the button 4552, the lever 4366a is free to rotation to the second position (B). When the lever 4366a is in the second position (B), the detent 4548 of the locking mechanism 4542 extends radially outwardly from the distal end 4544 of the filter designator 4366b to physically engage the stop 4546 to lock the filter designator 4366b in the second position (B). After the user retracts the detent 4548, the lever 4366a may then be rotated back toward the first position (A).

In the illustrated embodiment, the contour of the distal end 4544 of the unlock lever 4366a is shaped so that it physically locks the filter designator 4366b in the first position (i.e., the upright 12 o'clock position) when the lever 4366a is in the first position (A). More specifically, the distal end 4544 is substantially flat and wide, so that the flat surface engages a corresponding flat surface of the filter designator 4366b. By doing so, the physical interaction between the two surfaces restricts any rotation of the filter designator 4366b relative to the perimeter wall 4240.

The lever 4366a also includes a linkage 4556 to mechanically link the lever 4366a with the gate 4538 of the valve 4524. More specifically, the linkage 4556 includes a rod that interconnects the gate 4538 and lever 4366a so that rotation of the lever 4366a from the first position (A) to the second position (B) causes the gate 4538 to rotate from the open position to the closed position. While the illustrated linkage 4556 includes a rod, it is understood that in other embodiments different forms of connection such as gears, levers, and the like may also be used.

The filter designator 4336b of the master control assembly 4362 is configured to coordinate and control the operating conditions of the first and second filter control assemblies 4220a, 4220b. More specifically, the filter designator 4336b is adjustable between a first or vacuum position, in which both filter control assemblies 4220a, 4220b are in the standard position (see FIG. 3A for reference), a second or first filter select position, in which the first filter control assembly 4220a is in the clean position while the second filter control assembly 4220b is in the standard position (see FIG. 3B for reference), and a third or second filter select position, in which the first filter control assembly 4220a is in the standard position while the second filter control assembly 4220b is in the clean position (see FIG. 3C for reference).

The filter designator 4336b is rotatable about a knob axis 4404 with respect to the housing 4216 between the first, second, and third positions as described above. In the illustrated embodiment, the first position is when the distal end 4408 of the lever 4366b is at the 12 o'clock location, the second position is when the distal end 4408 of the filter designator 4366b is at the 3 o'clock position, and the third position is when the distal end 4408 of the filter designator 4366b is at the 9 o'clock position. However, in other embodiments different rotational positions may be used.

In the illustrated embodiment, the filter designator 4366b includes a main shaft 4412 coupled to and rotatable together with the filter designator 4366b about the axis 4404, a first actuation cam 4560 fixedly coupled to the main shaft 4412, a second actuation cam 4564 fixedly coupled to the main shaft 4412, a first lever arm 4432, and a second lever arm 4436.

The first cam 4560 and the second cam 4564 each form a cammed surface that is configured to contact and engage the first and second lever arms 4432, 4436, respectively. More specifically, the cammed surfaces of the cams 4560, 4564 are shaped such that rotating the main shaft 4412 about the axis 4404 will selectively cause the lever arms 4432, 4436 to travel along the corresponding cammed surfaces and bias the corresponding filter control assemblies 4220a, 4220b between the standard and cleaning positions.

In the illustrated embodiment, the two cams 4560, 4564 are fixedly coupled to the main shaft 4412 on opposite sides thereof (i.e., rotationally offset from each other 180 degrees). As such, the cams 4560, 4564 are shaped and positioned on the main shaft 4412 so that rotating the main shaft 4412 from the first position to the second position (i.e., clockwise from the 12 o'clock position to the 3 o'clock position) will cause the first cam 4560 to force the first lever arm 4432 to move the first filter control assembly 4220a from the standard position to the cleaning position (i.e., rotate in a clockwise direction as shown in FIG. 32) while the second filter control assembly 4220b remains in the standard position (i.e., will not engage its corresponding cam 4564). In contrast, rotating the main shaft 4412 from the first position to the second position (i.e., counter-clockwise from the 12 o'clock position to the 9 o'clock position) will cause the first lever to remain in the standard position (i.e., will not engage its corresponding cam 4560), while the second cam 4564 will force the second lever arm 4436 to move the second filter control assembly 4220b from the standard position to the cleaning position (i.e., rotate in a counter-clockwise direction as shown in FIG. 32).

Stated differently, the cammed surface of the first cam 4560 is configured so that the location of the cammed surface engaged by the first lever arm 4432 extends outwardly (i.e., away from the second cam 4564) as the main shaft 4412 rotates clockwise. Similarly, the cammed surface of the second cam 4564 is configured so that the location of the cammed surface engaged by the second lever arm 4436 extends outwardly (i.e., away from the first cam 4560) as the main shaft 4412 rotates counter-clockwise.

Although not shown, the main shaft 4412 may also include a biasing member incorporated therein to bias the shaft 4412 into the first position such that the filter designator 4366b may only remain in the second or third positions if being actively held in that position by the user.

To operate the vacuum assembly 4104, the user first installs the filter assembly 4100 between the power head 108 and the collection container as described above, making sure to remove the head unit filter 204 before attaching the two units. With the vacuum assembly 4104 assembled, the user may then operate the vacuum in a standard vacuum configuration. To do so, the vacuum unlock lever 4366a is placed in the first position resulting in the transition control assembly 4236 being placed in the open configuration and the filter designator 4366b being locked in the first position (see FIG. 37B). As shown in FIG. 36, locking mechanism 4542 retains the unlock lever 4366a in the first position.

With the vacuum in the standard vacuum configuration, the user may then activate the blower assembly 120 (i.e., turn on the vacuum assembly 4104) to generate a relatively low-pressure region upstream of the blower assembly 120 and produce a pressure differential between the collection volume 124 and the surrounding atmosphere. For the purposes of this application, the steady-state pressure differential between the collection volume 124 and the surrounding atmosphere during normal vacuum operations is referred to as the vacuum pressure differential (VPD).

In some embodiments, the VPD is between 7 inH2O and 12 inH2O (±1%, ±2%, ±5%, ±10%). In other embodiments, the VPD is less than or equal to 15 inH2O (±1%, ±2%, ±5%, ±10%). In other embodiments, the VPD is less than or equal to 20 inH2O (±1%, ±2%, ±5%, ±10%). In still other embodiments, the VPD is between 5 and 15 inH2O (±1%, ±2%, ±5%, ±10%). In still other embodiments, the VPD is approximately 7.7 inH2O (±1%, ±2%, ±5%, ±10%). In still other embodiments, the VPD is approximately 11.7 inH2O (±1%, ±2%, ±5%, ±10%).

The VPD then causes dust and debris laden air to be drawn into the collection volume 124 via the inlet passage 160. Upon entering the collection volume 4124, any large debris is separated from the airflow and deposited therein. The semi-treated air then flows in parallel fashion through both the first and second filters 116a, 116b in a first direction. By doing so, the air is treated further where finer dust and debris is removed from the airflow via the filter elements 268a, 268b.

After being treated by the filter elements 268a, 268b, the treated airflow then continues into the discharge air port 4228 where the parallel flows recombine and pass through the debris cage 4508 contained therein. After passing through the debris cage 4508 where any remaining debris is removed, the combined airflows are drawn into the blower assembly 120 itself via the blower inlet 192. Finally, the airflows are exhausted to the atmosphere via the blower outlet 200.

In instances where the first and/or second filter 116a, 116b is saturated with dust and/or debris and needs to be cleaned, the user may place the vacuum 4104 in the first filter cleaning configuration and/or the second filter cleaning configuration as the blower assembly 120 continues to operate. To do so, the user first actuates the button 4552 on the unlock lever 4366a causing the detent 4548 to retract into the unlock lever 4366a and allowing the unlock lever 4366a to be rotated relative to the perimeter wall 4240.

Once unlocked, the user then rotates the unlock lever 4366a from the first position to the second position where the detent 4548 then automatically engages the stop 4546 securing the unlock lever 4366a in the second position (see FIG. 37C). By doing so, the transition control assembly 4236 is placed in the closed configuration and the filter designator 4366b is unlocked and free to rotate relative to the perimeter wall 4240. This action changes the filter assembly 4100 from the standard or vacuum configuration (see FIG. 3A for reference), to the general cleaning configuration.

In the general cleaning configuration, the gate 4528 is pivoted shut to block flow through the transition passageway 4232 that extends between the inlet passage 160 and the collection volume 124 of the collection container 112. This inhibits air from flowing into the collection container from the inlet passage 160. Because the filter designator 4366b cannot be operated until it is unlocked by the unlock lever 4366a (e.g., when the unlock lever 4366a is rotated into the second position), there is a time delay between the moment the user rotates the unlock lever 4366a and the moment the user rotates the filter designator 4366b (e.g., there is a time delay between the moment where the transition control assembly 4236 enters the closed configuration and the moment one of the filter control assemblies 4220a, 4220b enters the cleaning configuration).

During this time delay, the continued operation of the blower assembly 120 causes the pressure differential between the collection volume 124 and the surrounding atmosphere to increase. For the purposes of this application, the pressure differential generated after the transition control assembly 4236 is in the closed configuration but before the corresponding filter control assembly 4220a, 4220b enters the cleaning configuration is referred to as the surge pressure differential (SPD).

In the illustrated embodiment, the SPD is greater than the VPD. In some embodiments, the SPD is at least 30 inH2O (±1%, ±2%, ±5%, ±10%). In other embodiments, the SPD is at least 20 inH2O (±1%, ±2%, ±5%, ±10%). In still other embodiments, the SPD is at least 15 inH2O (±1%, ±2%, ±5%, ±10%). In still other embodiments, the SPD is between 20 inH2O and 100 inH2O. In still other embodiments, the SPD is between 30 inH2O and 80 in H2O. In still other embodiments, the SPD is between 40 inH2O and 70 in H2O. In still other embodiments, the SPD is approximately 46.8 inH2O (±1%, ±2%, ±5%, ±10%). In still other embodiments, the SPD is approximately 64.4 inH2O (±1%, ±2%, ±5%, ±10%). In still other embodiments, the SPD is between 60 and 70 inH2O (±1%, ±2%, ±5%, ±10%). In still other embodiments, the SPD is between 90 and 120 inH2O (±1%, ±2%, ±5%, ±10%). In still other embodiments, the SPD is between 70 and 120 inH2O (±1%, ±2%, ±5%, ±10%).

In still other embodiments, there is variability in the SPD based at least in part on the duration of time that has elapsed since the user actuated the unlock lever 4366a. Given the variability, in some embodiments the SPD can be increased to between about 10 and about 80 inH2O in the first 1 to 3 seconds. In other embodiments, the SPD increases to between about 15 and about 75 inH2O in the first 1 to 3 seconds. In still other embodiments, the SPD increases to between about 20 and about 70 inH2O in the first 1 to 3 seconds. In still other embodiments, the SPD increases to about 25 to about 65 inH2O. In still other embodiments, the SPD increases to between about 35 and about 55 inH2O. In some embodiments, the SPD increases to approximately 45 inH2O in the first 1 to 3 seconds.

From the general cleaning configuration, the user may then select which of the two filters 116a, 116b they would like to clean. To place the vacuum in the first filter cleaning configuration (i.e., to clean the first filter 116a), the user rotates the filter designator 4366b from the first position to the second position (i.e., clockwise 90 degrees from the upright 12 o'clock position to the 3 o'clock position; see FIG. 37D). By doing so, the main shaft 4412 also rotates clockwise 90 degrees causing the cammed surface of the first cam 4560 to engage the first lever arm 4432 which in turn moves the first filter control assembly 4220a from the standard configuration to the cleaning configuration. At the same time, the cammed surface of the second cam 4564 does not engage the second lever arm 4436 allowing the second filter control assembly 4220b to remain in the standard configuration.

With the filter assembly 4100 in the first filter cleaning configuration, ambient air flows into the vacuum 104 via the ambient air port 4224. The fresh air then travels to the first filter 114a where it passes through the filter 116a in the second direction B. By flowing through the filter 116a in the second direction B, the dust and debris lodged into the filter element 268a during normal vacuum operations (e.g., deposited by air flowing through the filter in the first direction A) will be dislodged therefrom where it may be collected within the collection volume 124.

Due to the SPD, the air briefly moves at a relatively high velocity (e.g., creates an airflow surge through the filter 116a). The resulting surge more quickly releases debris from the filter 116a than a slower flow of air would be capable of achieving even over a longer time period. Indeed, testing has shown that the increased airflow generated by an SPD greater than the VPD can almost double the amount of airflow recovered from the filter 116a (e.g., 42% recovery of original airflow capability with the VPD versus up to 83% recovery of original flow capability with an increased SPD). Generally speaking, the surge continues until the initial SPD is reduced to the VPD.

After passing through the first filter 116a, the airflow then flows through the second filter 116b in the first direction A. To the extent any fine dust or debris remains in the airflow at this point, it will be treated as it passes through the second filter 116b and removed. The fully treated air then continues into the discharge air port 4228 where the airflow is drawn through the debris cage 4508 and out via the blower assembly 120.

Once cleaning of the first filter 116a is complete, the user may then exit the first cleaning configuration by releasing the filter designator 4366b causing it to rotate into the first position (i.e., the upright position; see FIG. 37C). By returning to the first position, the filter assembly 4100 returns to the general cleaning configuration (discussed above) where the pressure differential between the collection volume 124 and the surrounding atmosphere begins to increase.

In instances where the user wishes to clean the second filter 116b, the user may place the vacuum 104 in the second filter cleaning configuration. To do so, while the unlock lever 4366a remains in the second position as discussed above, the user rotates the filter designator 4366b into the third position (e.g., rotates the filter designator 4366b 90 degrees counterclockwise to the 9 o'clock position from the 12 o'clock position; see FIG. 37E). By doing so, the main shaft 4412 also rotates counterclockwise 90 degrees which causes the cammed surface of the second cam 4564 to engage the second filter lever 4436 which in turn moves the second filter control assembly 4220b from the standard configuration to the cleaning configuration. At the same time, the cammed surface of the first cam 4560 does not engage the first lever arm 4432 allowing the first filter control assembly 4220a to remain in the standard configuration.

As noted above, the layout of the user inputs 4366a, 4366b of the filter assembly 4100 require the user to first place the transition control assembly 4236 in the closed configuration before either filter control assembly 4220a, 4220b may be placed in the cleaning configuration. This results in a time delay between the two actions. As stated above, the time delay between these two actions causes the SPD to increase beyond the VPD.

With the filter assembly 4100 in the second filter cleaning configuration, ambient air flows into the vacuum 104 via the ambient air port 4224. The ambient air then travels to the second filter 116b where it passes through the filter in the second direction B. By flowing through the filter in the second, reverse direction B, the dust and debris lodged into the filter element 268b during normal vacuum operations (e.g., deposited by air flowing through the filter in the first direction A) will become dislodged therefrom where it may be collected within the collection volume 124. As stated above, the increase SPD causes an initial air surge to increase cleaning capacity.

After passing through the second filter 116b, the airflow then flows through the first filter 116a in the first direction A. To the extent any find dust or debris remains in the airflow at this point, it will be treated as it passes through the first filter 116a.

The fully treated air then continues into the discharge air port 4228 where the airflow is drawn into the blower assembly 120 itself via the blower inlet 192 and subsequently exhausted to the atmosphere via the blower outlet 200. The user can continue to operate the vacuum 104 in the second filter cleaning configuration for as long as deemed necessary to sufficiently clean the second filter 116b.

Once cleaning of the second filter 116b is complete, the user may then exit the second cleaning configuration by releasing the filter designator 4366b causing it to automatically rotate back into the first position (i.e., the upright position).

After cleaning operations are complete, the user may then return the vacuum 104 to the standard vacuum configuration while the blower assembly 120 remains in operation. To do so, the user returns the vacuum unlock lever 4366a to the first position by releasing the detent 4548 and rotating the vacuum unlock lever 4366a to the first position. By doing so, the transition control assembly 4236 returns to the open configuration and the filter designator 4366b becomes locked in the first position (i.e., locking both filter control assemblies 220a, 220b in the standard configuration).

With reference to FIG. 38, in some embodiments, the filters 116a, 116b can be regions of a single filter or filter cartridge 4604. In these embodiments, the filter 116a is a first filter region and the filter 116b is a second filter region of the same filter 4604. In some embodiments, the single filter 4604 may include a single continuous filter element 268 producing both filter regions. In other embodiments, the single filter 4604 may include a single filter body or frame supporting multiple separate filter elements 268.

As shown in FIGS. 38, 39A and 39B, in some embodiments, a divider 4600 may be positioned between the filters or filter regions 116a, 116b. In such embodiments, the divider 6400 includes a wall or barrier that extends outwardly beyond the surface of the filters 116a, 116b so that air exiting one filter must take an elongated flow path before entering the adjacent filter during the cleaning process (e.g., air exiting the first end 264a of the first filter 116a must flow around the divider 4600 before entering the first end 264b of the second filter 116b). In some embodiments, the divider 6400 extends outwardly beyond both filters 116a, 116b and has sufficient width so that no straight flow path is provided therebetween. In other embodiments, the divider 6400 is positioned so that no straight reference axis can intersect the first and second filter elements 268a, 268b without also passing through the divider 6400. In still other embodiments, the divider 4600 extends outwardly beyond the first end 264a, 264b of both filters 116a, 116b and into the storage volume 124. During use, the divider 4600 can enhance cleaning of the filters because the divider 4600 inhibits air from traveling straight from one filter to the other. Rather, the divider 4600 directs the debris-laded air to travel a somewhat circuitous path between the filters increasing the chance that any dirt contained therein will be discharged into the volume 124.

In some embodiments, the diverter 4605 includes an outwardly extending portion 4605a and an overlap portion 4605b that extends at an angle relative to the first portion 4605a to at least partially overlap one or both filters 116a, 116b (see FIG. 39B). In such embodiments, the overlap portion 4605b is positioned such that a reference axis oriented normal to the filter plane 4608 of the corresponding filter 116a, 116b will pass through both the filter element 268 and the diverter 4605 simultaneously. In some embodiments, the overlap portion 2605b of the diverter 4605 extends parallel to the filter plane 4608. In still other embodiments, the extending portion 4605a is positioned between the first filter 116a and the second filter 116b. In still other embodiments, the extending portion 4605a is positioned between filters 116a, 116b and the transition passageway 4232.

In some embodiments, the overlap portion 4506b of the diverter extends across at least 10% of the length of the filter 116a, 116b. In some embodiments, the overlap portion 4506b of the diverter extends across at least 20% of the length of the filter 116a, 116b. In some embodiments, the overlap portion 4506b of the diverter extends across at least 30% of the length of the filter 116a, 116b. In some embodiments, the overlap portion 4506b of the diverter extends across at least 40% of the length of the filter 116a, 116b. In some embodiments, the overlap portion 4506b of the diverter extends across at least 50% of the length of the filter 116a, 116b. In some embodiments, the overlap portion 4506b of the diverter extends across at least 75% of the length of the filter 116a, 116b. In some embodiments, the overlap portion 4506b of the diverter extends across at least 90% of the length of the filter 116a, 116b. In some embodiments, the overlap portion 4506b of the diverter extends across approximately the entire length of the filter 116a, 116b. Other shapes, sizes and configurations of dividers 4600 and diverters 4605 can be included and the first filter 116a can include a different size or shape of divider and/or diverter than the second filter 116b.

As shown in FIGS. 40-42, in some embodiments one or both of the filters 116a, 116b of the filter assembly 4100 may be oriented at various angles with respect to the air inlet passage 160 to enhance dislodging of debris from the airflow prior to the air entering the filters 116a, 116b. More specifically, each filter 116a, 116b defines a filter plane 4610 which in turn defines a filter angle 4612 measured relative to a reference axis 4616 oriented normal to the base wall 136 such that a filter angle 4612 greater than 90 degrees represents a filter facing toward the inlet passage 160 (see FIG. 41), a filter angle 4612 of 90 degrees represents a filter oriented generally horizontally (e.g., parallel with the base wall 136; see FIG. 40), and a filter angle 4612 less than 90 degrees represents a filter facing away from the inlet passage 160 (see FIG. 42). While only the filter 116a is specifically shown in FIGS. 40-42, it is understood that filter 116b may also share the same orientation as the first filter 116a.

In some embodiments, the filter angle 4612 may be less than 90 degrees. In still other embodiments, the filter angle 4612 may be less than 80 degrees. In still other embodiments, the filter angle 4612 may be less than 70 degrees. In still other embodiments, the filter angle 4612 may be less than 60 degrees. In still other embodiments, the filter angle 4612 may be less than 50 degrees. In still other embodiments, the filter angle 4612 may be less than 45 degrees. In still other embodiments, the filter angle 4612 may be less than 90 degrees but greater than or equal to 30 degrees. In still other embodiments, the filter angle 4612 may be less than or equal to 60 degrees and greater than or equal to 30 degrees. In still other embodiments, the filter angle 4612 may be greater than or equal to 10 degrees and less than or equal to 80 degrees. In still other embodiments, the filter angle 4612 may be approximately 90 degrees. In still other embodiments, the filter angle 4612 may be approximately 135 degrees.

While the illustrated filter control assemblies 220a, 220b include disc valves using axial motion to engage and disengage the corresponding valve seats, it is understood that in other embodiments different types of valves may be used such as, but not limited to, butterfly valves, globe valves, knife valves, and the like.

In some embodiments, the valve control assemblies 220a, 220b may include a combination of three interconnected valves 4800, 4804, 4808 that are all mounted on a common central shaft 4812 and move axially together between a first position, in which the first and third valves 4800, 4808 are open while the second valve 4804 is closed, and a second position (see FIG. 43), in which the first and third valves 4800, 4808 are closed while the second valve 4804 is open. As shown in FIG. 43, the first and third valves 4800, 4808 extend between and control the flow of fluid between a sub-chamber 272 and the ambient air port 224 while the second valve 4804 extends between and controls the flow of fluid between the sub-chamber 272 and the blower assembly 120.

As shown in FIG. 43, the layout of the valves 4800, 4804, 4808 are configured to reduce the force required to move the assembly from the second position to the first position (e.g., opening the first and third valves 4800, 4808). More specifically, the valves 4800, 4804, 4808 are arranged so that the forces applied by the relatively high-pressure region located in the ambient air port 224 (Forces A and B) cancels out as it is applied in opposing directions against the entire assembly. Stated differently, the force applied to the first valve 4800 due to the pressure differential between the ambient air port 224 and the sub-chamber 272 is applied in a first direction axially along the assembly (Force A), while the force applied to the third valve 4808 due to the same pressure differential is applied in a second direction axially along the assembly (Force B) that is opposite first direction. As such, the force required to move the assembly from the second position to the first position is reduced. In the illustrated embodiment, while both the first and third valves 4800, 4808 are configured to regulate fluid flow between the sub-chamber 272 and the ambient air port 224, one valve (e.g., the third valve 4808) is positioned within the sub-chamber 272 while the other valve (e.g., the first valve 4800) is positioned within the ambient air port 224.

In other embodiments, the filter control assemblies 220a, 220b may include a pair of valve disks 4620, 4625 that are pivotably mounted so that a pivoting motion causes the disks to alternatively change between open and closed configurations (see FIGS. 44A-C). As shown in FIGS. 44A-C, the pivoting point is located proximate disk 4620. In some embodiments, the pivoting point is incorporated into the disk 4620. In the illustrated embodiment, disk 4620 is analogous to the second or fourth disk 280, 308 of the filter control assembly 220a, 220b while disk 4625 is analogous to the first or third disk 276, 304. As shown, the resulting assembly is pivotable between a first position, in which disk 4620 is in an open configuration and disk 4625 is in a closed configuration (see FIG. 44B) and a second position, in which disk 4620 is in a closed configuration and disk 4625 is in an open configuration.

As shown in FIGS. 44A-C to pivoting nature of the valve assembly permits the orientation of the valve seats to be angled with respect to each other to improve flow characteristics between the inlet, filter, and blower assembly.

The valve layout of FIGS. 44A-C also permits the size of the two disks 4620, 4625 to be different from each other. More specifically, the inner diameter of the valve seat associated with disk 4620 is larger than the inner diameter of the valve seat associated with disk 4625. In some embodiments, the inner diameter of the valve seat in fluid communication with the blower assembly 120 (e.g., the valve seat associated with disk 4620) is approximately 40 mm or greater. In other embodiments, the inner diameter of the valve seat in fluid communication with the blower assembly 120 (e.g., the valve seat associated with disk 4620) is approximately 56 mm or greater. Furthermore, the valve in fluid communication with the ambient air inlet (e.g., disk 4625) can be smaller than disk 4620 while still providing for adequate flow to clean the respective filter. The smaller size of disk 4625 reduces the actuation force required to open the respective valve. In the illustrated embodiment, the inner diameter of the valve seat in fluid communication with the ambient air inlet (e.g., the valve seat associated with disk 4625) is approximately 30 mm. In some embodiments, the inner diameter of the valve seat associated with disk 4620 is between approximately 25% to 90% larger than the inner diameter of the valve seat associated with disk 4625. In still other embodiments, the inner diameter of the valve seat associated with disk 4620 is between approximately 33% to 86% larger than the inner diameter of the valve seat associated with disk 4625.

In still other embodiments, the filter control assemblies 220a 220b may include a combination of valve arms 4900 incorporated into a single body 4904 with a given spatial relationship from each other so that rotation of the single body 4904 causes the valve arms 4900 to cover and uncover the needed valve seats 4908 for operation of the filter assembly 100 (see FIG. 45A).

In still other embodiments, the disks of the filter control assemblies 220a, 220b may be oriented at an angle with respect to each other. As shown in FIGS. 45B-D, one disk 4625a may be oriented perpendicular to the second disk 4620a such that the first disk 4625a slides parallel along its associated valve seat between an open and closed configuration while the second disk 4620a moves perpendicular relative to its associated valve seat between an open and closed configuration.

In still other embodiments, the filter control assemblies 220a, 220b may include a single body having a first sealing portion or region 4625b and second sealing portion or region 4620b incorporated therein (see FIG. 45E). By doing so, movement of the single body would cause the two portions 4625b, 4620b to move between the open and closed configurations (see Position A and Position B of FIG. 45E). More specifically, the single body includes a large plate valve with a horizontal plate portion forming the first sealing portion 4625b that can extend over the horizontal atmospheric opening (e.g., the opening in fluid communication with the ambient air intake) and a vertical plate portion forming the second sealing portion 4620b that can extend over the vertical motor opening (e.g., the opening in fluid communication with the blower assembly 120). The lower left figure shows Position A in which the atmospheric opening is covered, and the motor opening is uncovered. The lower right figure shows Position B in which the motor opening is covered, and the atmospheric opening is uncovered.

In still another embodiment, the filter control assemblies 220a, 220b may include a large plate valve including a horizontal plate portion 4625c and a vertical plate portion 4620c. The large plate valve can extend over either the horizontal atmospheric opening or over the vertical motor opening. Specifically, the horizontal plat portion 4625c includes an aperture formed therein that selectively aligns with the atmospheric opening. The middle figure shows Position A in which the atmospheric opening (e.g., the opening in fluid communication with the ambient air intake) is covered, and the motor opening (e.g., the opening in fluid communication with the blower assembly 120) is uncovered. The bottom figure shows Position B in which the motor opening is covered, and the atmospheric opening is uncovered by the plate valve (e.g., the opening in the horizontal plate portion 4625c aligns with the atmospheric opening).

In still another embodiment, the filter control assemblies 220a, 220b may include a pair of coaxial valves where both disk valves 4624d, 4620d are in axial alignment and have a similar size.

In still another embodiment, the filter control assemblies 220a, 220b may include a pair of valve disks disk valves 4625e, 4620e that both move axially together as a single unit but that are radially offset from each other (see FIG. 45H).

In addition to the various valve configurations illustrated and described herein, several different types of valves or combinations of valves could be used with the filter assembly 100. For example, the valves utilized herein can be one or more of the following: rotating butterfly valves, translating plunger valves, pressure-biased translating plunger valves, one-way relief valves, vacuum-assisted one-way valves, flapper valves, gate valves, iris valves, flexible hose valves, spool valves and/or diaphragm valves.

While the illustrated embodiment relies on the physical shape of the user inputs 4366a, 4366b to restrict the motion of the filter designator 4366b while the unlock lever 4366a is in the first position, in other embodiments separate mechanisms may be used to link the operation of the filter designator 4366b to the unlock lever 4366a. As shown in FIGS. 46A and 46B, an internal linkage 5100 may be present to restrict the motion of the filter designator 4366b while the unlock lever 4366a is in the first position and unlock the filter designator 4366b when the unlock lever 4366a is in the second position. In the illustrated embodiment, the linkage 5100 includes a locking bar 5104 that is movable between an engaged position, in which the locking bar 5104 engages and locks the filter designator 4366b relative to the housing 152, and a disengaged position, in which the locking bar 5104 does not engage the filter designator 4366b allowing it to rotate with respect to the housing 152. During use, the locking bar 5104 is biased toward the engaged position by a spring 5108 (see FIG. 46B). The linkage 5100 also includes a cam 5112 (see FIG. 46A) incorporated into the unlock lever 4366a such that rotation of the unlock lever 4366a from the first position to the second position causes the cam 5112 to engage and bias the locking bar 5104 out of the engaged position and into the disengaged position.

In II other embodiments, the unlock lever 4366a may also include a second locking assembly 5200. The locking assembly 5200 is incorporated into the unlock lever 4366a itself and, through a series of cammed surfaces allows the unlock lever 4366a to rotate in a first direction (e.g., counter-clockwise from the first position to the second position) but then requires that the unlock lever 4366a be pulled axially outwardly (e.g., away from the housing 152) before it can be rotated in the second direction opposite the first direction (e.g., clockwise from the second position to the first position).

In still other embodiments, the inputs unlock lever 4366a may be configured to selectively provide access to the filter designator 4366b (see FIGS. 46D and 46E). More specifically, in the illustrated embodiment, access to the filter designator 4366b is controlled by the presence of a closure, such as an overlapping knob 5300 or a hinged window 5302. The overlapping knob 5300 is shown in FIG. 46D and is moveable between a first position (see left figure) and a second position (see middle and right figures). In the illustrated embodiment, the overlapping knob 5300 pivots between the first position and the second position. While in the first position, the overlapping knob 5300 inhibits the user from accessing or manipulating the filter designator 4366b. While in the second position, the overlapping knob 5300 permits a user to access and manipulate the filter designator 4366b. During use, moving the unlock lever 4366a from the first position to the second position causes the overlapping knob 5300 to move from the first position to the second position.

FIG. 46E shows the hinged window 5302 which is movable between a first position left figure, in which the user cannot access or manipulate the filter designator 4366b, and a second position (see middle and right figures), in which the user may access and manipulate the filter designator 4366b. The illustrated hinged window 5302 pivots between the first and second positions. During use, moving the unlock lever 4366a from the first position to the second position causes the hinged window 5302 to move from the first position to the second position.

Another possible option that can be used in conjunction with any of the options disclosed herein is to provide one or more external ribs to visually and physically establish the possible positions for the vacuum unlock lever 4366a and/or filter designator 4366b. The illustrated ribs include outer rib 4640 and inner rib 4645 each of which include a 90-degree bend. FIG. 46F shows the vacuum unlock lever 4366a in both the lowered and raised positions, and ribs surrounding the vacuum unlock lever 4366a in both positions. The height of the ribs 4640, 4645 is such that a user can grasp the lever and move the lever across the ribs 4640, 4645, but then the ribs 4640, 4645 retain the vacuum unlock lever 4366a in the selected position.

In some embodiments, the handles, levers and other moveable components can be recessed from an outer perimeter of the filter assembly 100. FIG. 46G illustrates that the lower edge of the filter assembly 100 can include a protruding portion 4650, such that the handle and levers are recessed to limit accidental contact with the handle and levers. FIG. 46H illustrates an upper bump out protector plate 4655 positioned above the levers to limit accidental contact with the levers. Other configurations to protect the levers can be utilized and these illustrations are provided for example only.

In some embodiments, the inlet passage 160 can include different geometries to correspond with different configurations of the valve body 354. One possible example includes an elbow sleeve with a sliding plate cover 7000 that is moved by an external handle 7004. The handle 7004 causes the plate 7000 to travel to cover or uncover the inlet passage 160 (see FIG. 47A).

In another embodiment, the inlet passage 160 may include a butterfly valve 7008 positioned at least partially therein (see FIG. 47B-C). The butterfly valve 7008 may be installed so that the axis of rotation is horizontal (FIG. 47B) or vertical (47C).

In some embodiments, the position, orientation, and geometry of the transition passage 4232 may be altered to influence the airflow within the vacuum assembly 104. In some embodiments, the transition passage 4232 may be oriented so that it is positioned equally between the first and second filters 116a, 116b (see FIG. 48A). In still other embodiments, the axis of rotation of the gate 4528 may be oriented parallel to the longitudinal axis of the filter assembly 100 (see FIG. 48A). In still other embodiments, the transition passage 4332a may be offset so that it more closely aligns with one of the filter assemblies 116a and is positioned further from the other filter assembly 116b (see FIG. 48B). In still other embodiments, the axis of rotation of the gate 4528 may be oriented parallel to the lateral axis of the filter assembly 100 (see FIG. 48B).

In still other embodiments, at least a portion of the transition passage 4232, 4332a can be removable to clean and remove clogs if needed. The second end 4332 of the transition passage 4232 can also include a scoop to direct flow of air and debris toward the filters 116a, 116b. See FIG. 48C for two possible examples of a transition passage 4332b, 4332c having a scoop at the second end.

In some embodiments, in order to unlock the filter designator, instead of using the vacuum unlock lever, the user may insert an end of a hose 4660 into a location on the filter assembly 100 and/or on the power head 108 to permit the filter designator to move. One or more actuators can be actuated by inserting the hose 4660. The hose should not be fluidly connected to the blower outlet 200 to unlock the filter designator. See FIGS. 49A and 49B for some possible examples of this feature.

In addition to the master control assemblies discussed above, additional master control assemblies may also be used in combination with the filter control assemblies 220a, 220b and the transition control assembly 236. Some possible non-limiting examples are shown in FIGS. 50A through 50F. FIG. 50A illustrates a master control assembly utilizing a wheel 8000 attached to a rod having a plurality of cams or actuators 8004 placed at strategic locations along the length thereof. Opening and closing of the tank inlet 8002 is accomplished by axially pushing and pulling the wheel 8000 relative to the filter assembly. After the inlet is closed, rotation of the wheel 8000 causes the various cams 8004 to engage with and manipulate a series of valve gates 8008. The system is configured so that rotation of the wheel 8000 in one direction causes the first filter 116a to be placed in a cleaning configuration while rotation of the wheel 8000 in a second direction causes the second filter 116b to be placed in a cleaning configuration.

In another embodiment, FIG. 50B illustrates a pull and twist master control assembly in which a single knob 8012 is pulled away from the filter assembly 100 to close the tank inlet 8016. Then, the knob 8012 is twisted clockwise to place the first filter 116a in a cleaning configuration and twisted counterclockwise to place the second filter 116b in a cleaning configuration. After the filters are adequately cleaned, the knob is pushed back in to reopen the tank inlet. As shown in FIG. 50B, each filter 116a, 116b includes a valve assembly 8018 that is similar to that shown in FIG. 43, resulting in reduced force requirements to transition the device between the various operating conditions.

In another embodiment, FIG. 50C illustrates a master control assembly in which there are three user interactions. First, switch cover 8024 is actuated to close the tank inlet 8028 and to reveal two pull knobs 8032a, 8032b. The pull knobs 8032a, 8032b may then be pulled one at a time to clean the respective filters. After both filters are cleaned, the switch cover 8024 is closed to open the tank inlet 8028 and shroud the pull knobs 8032a, 8032b so they cannot be accessed by the user.

FIG. 50D illustrates a dual lever master control assembly. Actuation of each lever 8050a, 8050b first closes the tank inlet 8054, then opens the respective filter cleaning plunger valve 8058.

FIG. 50E illustrates a twist and swing valve control configuration in which a first knob 8060 is rotated to close the tank inlet 8064 and the second knob 8068 swings in a first direction to clean the first filter 116a and swings in a second direction to clean the second filter 116b.

FIG. 50F illustrates a twist, reveal and pull valve control configuration that includes three user interactions. A switch cover 8090 is rotated to close the inlet valve 8094 and to reveal two pull knobs 8098a, 8098b. Then, the pull knobs 8098a, 8098b are pulled in succession to clean the respective filters 116a, 116b. After the filters 116a, 116b are cleaned, the switch cover 8090 is rotated to cover the two pull knobs 8098a, 8098b and to open the tank inlet valve 8094.

While the present filter assembly 4100 includes a pair of equal sized planar filters 116a, 116b, other filter combinations may be used. In some embodiments, the filter assembly 4100 may be incorporated into the power head such that the stock cylindrical filter 116e is utilized. In such embodiments, the stock filter 116e may provide two filter regions 116a, 116b as discussed above. In still other embodiments, a cylindrical filter with multiple filter regions may also be incorporated into a separately housed filter assembly. (see FIG. 51A).

In other embodiments, the filter assembly 4100 may be incorporated into the power head such that stock cylindrical filter 116e is used and supplemented with a second planar filter 116f. As shown in FIG. 51B, the second planar filter 116f may be faced away from the cylindrical filter 116e to increase the airflow path between the two filters. The valve arrangement can be adjusted if needed. In still other embodiments, the combined cylindrical and planar filter arrangement shown in FIG. 51B may be incorporated into a separately housed filer assembly.

In another embodiment, the filter assembly 4100 may be incorporated into the flow head with one or more planar filters 116g incorporated therein. The flow through the planar filters 116g may then be directed through the previously existing stock filter location (see FIG. 51C). This can provide lower flow resistance than the stock filter. If needed, the height of the filter assembly 100 can be taken into account with the height of the auxiliary filters. Yet another possible filter configuration uses a single, segmented auxiliary filter 116h, such as the illustrated embodiment of FIG. 51D. This has the smallest potential product size and can be convenient for sealing and valving arrangements.

Different configurations and arrangements can be utilized to releasably retain the filters 116a, 166b in place. Ergonomic filter knob locks 4680a, 4680b can be pivoted open and closed to permit a user to lock and unlock a filter frame. Some possible filter knob locks are shown in FIG. 52A. In some embodiments the filter retention frame can include one or more frame undercuts to retain the filters within the filter retention frame. Some possible filter frame undercuts 4685a, 4685b, 4685c are shown in FIG. 52B. The filter retention frame can include one or more pivot points 4690 to encourage proper alignment while installing the filter retention frame and the filters. Some possible embodiments of filter frames with pivot points can be found in FIG. 52C. In still other embodiments, the divider 4600 (discussed above) may be incorporated into the retention frame.

FIGS. 53-60 illustrate another embodiment of the valve 9000. The valve 9000 is substantially similar to the valve 4524 described above. As such, only the differences will be described in detail herein. The valve 9000 includes a seat 9004 formed or otherwise incorporated into the transition passage 3262, and a gate 9008 movable with respect to the seat 9004 between an open position (see FIG. 53) and a closed position (see FIG. 58). During use, the valve 9000 is configured so that it minimizes any vibrational noises that may be generated when the valve 9000 is in the closed position during use. In some embodiments, no vibrational noises are generated when the valve 9000 is in the closed position during use.

As shown in FIGS. 53, 54, and 58-60, the seat 9004 of the valve 9000 is positioned within the transition passage 3262. In some embodiments, the seat 9004 is configured so that it at least partially surrounds a passage axis 4520. The seat 9004, in turn, forms multiple sealing surfaces 9016a, 9016b each forming a respective fluid-tight seal 9020a, 9020b with the valve 9000 during use. In some embodiments, each resulting fluid-tight seal 9020a, 9020b may have a unique attribute relative to the other seals 9020a, 9020b. For example, the type of interaction between the gate 9008 and the sealing surface 9016a, 9016b, the sealing characteristics of the seal, and/or the positional range over which the seal is maintained. In the illustrated embodiment, the seat 9004 includes a first sealing surface 9016a configured to form a first fluid-tight seal 9020a with the gate 9008 (e.g., with the first seal 9024 of the gate 9008) and a second sealing surface 9016b configured to form a second fluid-tight seal 9020b with the gate 9008 (e.g., with the second seal 9028 of the gate 9008).

The first sealing surface 9016a of the seat 9004 is oriented normal to the passage axis 4520 of the transition passage 3262 to define a first sealing plane 9032. As shown in FIG. 53, the illustrated surface 9016 faces downstream. In some embodiments, the first sealing surface 9016a completely encompasses the passage axis 4520 having a size and shape that generally corresponds with the size and shape of the gate 9008. In other embodiments, the size and shape of the first sealing surface 9016a generally corresponds with the size and shape of the first seal 9024 of the gate 9008. In the illustrated embodiment, the first sealing surface 9016a has a rectangular annulus shape.

The second sealing surface 9016b of the seat 9004 is oriented parallel to the channel axis 9012 of the transition passage 3262. In some embodiments, the second sealing surface 9016b is positioned radially outwardly from and at least partially downstream of the first sealing surface 9016a (e.g., at least a portion of the second sealing surface 6016b is positioned downstream of the first sealing plane 9032). In other embodiments, the second sealing surface 9016b has a size and shape that corresponds with the exterior size and shape of the gate 9008. In the illustrated embodiment, the second sealing surface 9016b extends along and runs parallel to three of the four sides of the first sealing surface 9016a (see FIG. 54). In still other embodiments, the shape of the second sealing surface 9016b taken normal to the passage axis 4520 may be different than the size and shape of the first sealing surface 9016a.

While the illustrated seat 9004 is shown being formed integrally with the transition passage 3262, it is understood that in other embodiments the seat 9004 may be formed separately and coupled thereto.

As shown in FIGS. 55-60, the gate 9008 of the valve 9000 includes a body 9040 defining a body reference plane 9044, a first seal 9048 coupled to the body 9040, and a second seal 9052 coupled to the body 9040. During use, the gate 9008 is movable relative to the seat 9004 between a closed position (see FIG. 58), a first intermediate position (see FIG. 59), a second intermediate position (see FIG. 60), and an open position (see FIG. 53). In the closed position, both the first seal 9048 and the second seal 9052 engage and form first and second seals 9020a, 9020b with the first and second sealing surfaces 9016a, 9016b, respectively. The first intermediate position is where the first seal 9048 initially disengages from the first sealing surface 9016a (e.g., the first seal 9020a is no longer fluid tight), and the second intermediate position is where the second seal 9052 initially disengages from the second sealing surface 9016b (e.g., the second seal 9020b is no longer fluid tight). In some embodiments, the second seal 9052 remains engaged when the gate 9008 is in the first intermediate position. In the open position, both the first seal 9048 and the second seal 9052 are disengaged from the first and second sealing surfaces 9016a, 9016b, respectively. In some embodiments, the open position also represents the gate 9008 being at or near the greatest limit of travel in the opening direction.

In some embodiments, the gate 9008 is pivotable with respect to the seat 9004 about a valve axis 9002. As shown in FIG. 58, the valve axis 9002 is oriented perpendicular to the passage axis 4520. Furthermore, the location of the valve axis 9002 is such that when the gate 9008 is in the open position, the gate 9008 extends downstream from the valve axis 9002 (i.e., toward the second end 4332).

The body reference plane 9044 is coplanar with the body 9040 of the gate 9008. In some embodiments, the body reference plane 9044 may also be coplanar to the third sealing surface 9084 of the first seal 9048. The body reference plane 9044 also defines a gate angle 9060 relative to the first sealing plane 9032. More specifically, the reference plane 9044 defines a first gate angle 9060a of approximately 0 degrees (±0.25 degrees, ±0.5 degrees, ±0.75 degrees, ±1 degree, ±2 degrees, ±5 degrees) when the gate 9008 is in the closed position. In other embodiments, the first gate angle 9060a may be between 0 and 1 degree. In still other embodiments, the first gate angle 9060a may be between 0 and 0.25 degrees. In still other embodiments, the first gate angle 9060a may be between 0 and 0.5 degrees.

The reference plane 9044 also defines a second gate angle 9060b of approximately 1.5 degrees (±0.25 degrees, ±0.5 degrees, ±0.75 degrees, ±1 degree, ±2 degrees, ±5 degrees) when the gate 9008 is in the first intermediate position. In other embodiments, the second gate angle 9060b may be between 0.5 and 3 degrees. In still other embodiments, the second gate angle 9060b may be between 1 degree and 2 degrees. In still other embodiments, the second gate angle 9060b may be between 1.25 degrees and 1.75 degrees.

The reference plane 9044 also defines a third gate angle 9060c of approximately 4 degrees (±0.25 degrees, ±0.5 degrees, ±0.75 degrees, ±1 degree, ±2 degrees, ±5 degrees) when the gate 9008 is in the second intermediate position. In other embodiments, the third gate angle 9060c is between 1.5 and 6.5 degrees. In still other embodiments, the third gate angle 9060c is between 3 and 5 degrees. In still other embodiments, the third gate angle 9060c is between 3.5 and 4.5 degrees.

The reference plane 9044 also defines a fourth gate angle 9060d of approximately 90 degrees (±0.25 degrees, ±0.5 degrees, ±0.75 degrees, ±1 degree, ±2 degrees, ±5 degrees) when the gate 9008 is in the open position. In other embodiments, the fourth gate angle 9060d is between 5 and 95 degrees. In still other embodiments, the fourth gate angle 9060d is between 45 and 95 degrees. In still other embodiments, the fourth gate angle 9060d is between 60 and 100 degrees.

The body 9040 of the gate 9008 is substantially planar having a first or upstream side 9064 and a second or downstream side 9068 opposite the upstream side 9064. The body 9040 also includes a pivot end 9072 defining the valve axis 9002, and a distal end 9076 opposite the pivot end 9072. When installed, the pivot end 9072 is sized and shaped to be coupled to the linkage 4556 such that rotation of the linkage 4556 (e.g., actuation of the unlock lever 4336a) causes the gate 9008 to rotate about the valve axis 9002 between the open and closed positions.

As shown in FIG. 57, the gate 9008 includes a series of ridges 9080 extending from the downstream side 9068 thereof. The ridges 9080 serve to reinforce the body 9040 so that it is more stiff and less susceptible to deformation and deflection during operation. In the illustrated embodiment, the ridges 9080 form a grid with the individual elements positioned parallel and perpendicular to the valve axis 9002. In other embodiments, different ridge 9080 or groove layouts may be used. In still other embodiments, the gate 9008 may be formed from PA6 (Nylon 6).

The body 9040 also includes a first seal 9048 fixedly coupled to the upstream side 9064 and configured to selectively engage the first sealing surface 9016a of the seat 9004 (see FIG. 55). In some embodiments, the seal 9048 includes a planar piece of resilient material having a third sealing surface 9084 oriented parallel to the valve axis 9002 such that the first sealing surface 9016a engages and compresses the first seal 9048 in a direction generally normal to the third sealing surface 9084 and normal to the body reference plane 9044. In still other embodiments, the third sealing surface 9084 is coplanar with the body reference plane 9044. In the illustrated embodiment, the first seal 9048 has a rectangular annulus shape that is sized and shaped to correspond with the size and shape of the first sealing surface 9016a such that the contact footprint between the two surfaces 9016a, 9084 completely encompasses the passage axis 4520.

During use, the first seal 9048 is configured so that it remains engaged with first sealing surface 9016a (e.g., forms the first seal 9024) between the closed position (see FIG. 58) and the first intermediate position (see FIG. 59). In some embodiments, the first seal 9024 has an engagement range (e.g., the angular range over which the first seal 9048 is maintained) of approximately 1.5 degrees (±0.25 degrees, ±0.5 degrees, ±0.75 degrees, ±1 degree). In other embodiments, the first seal 9024 has an engagement range between 1 and 3 degrees. In still other embodiments, the first seal 9024 has an engagement range between 1 and 2 degrees. In still other embodiments, the first seal 9024 is engaged between a gate angle 9060 of 0 and 3 degrees. In still other embodiments, the first seal 9024 is engaged between a gate angle 9060 of 0 and 2 degrees. In still other embodiments, the first seal 9024 is engaged between a gate angle 9060 of 0 and 1.5 degrees.

The body 9040 also includes a second seal 9052 fixedly coupled to the upstream side 9064 and configured to selectively engage the second sealing surface 9016b of the seat 9004 (see FIG. 55). In some embodiments, the seal 9052 includes ridge 9090 of resilient material extending outwardly from at least a portion of the perimeter of the body 9040 to define a distal edge 9094. In some embodiments, the ridge 9090 extends outwardly from the body 9040 in a direction parallel to the body reference plane 9044 such that the distal edge 9094 engages and slides along the second sealing surface 9016b whereby the arcuate path of travel causes the ridge 9090 to be compressed in a direction parallel to the body reference plane 9044.

In the illustrated embodiment, the second seal 9052 is formed from the same piece of resilient material as the first seal 9048. However, in other embodiments the two seals 9052, 9048 may be formed separately. In still other embodiments, the two seals 9052, 9048 may be formed from materials having different attributes such as, but not limited to, resiliency. In still other embodiments, both the first seal 9048 and the second seal 9052 are formed from a single piece of TPE 360, and specifically TPE 360BK001. In still other embodiments, the first and second seals 9048, 9052 may have a durometer/hardness of 62 Shore A. In other embodiments, the first and second seals 9048, 9052 may be formed from TPE 360STI-50 having a durometer/hardness of 50 Shore A.

During use, the second seal 9052 is configured so that it remains engaged with second sealing surface 9016b (e.g., forms the second seal 9028) between the closed position (see FIG. 58) and the second intermediate position (see FIG. 60). In some embodiments, the second seal 9028 has an engagement range of approximately 4 degrees (±0.25 degrees, ±0.5 degrees, ±0.75 degrees, ±1 degree, ±2 degrees). In other embodiments, the second seal 9028 has an engagement range between 1 and 6 degrees. In still other embodiments, the second seal 9028 has an engagement range between 2 and 6 degrees. In still other embodiments, the second seal 9028 has an engagement range between 3 and 5 degrees. In still other embodiments, the second seal 9028 has an engagement range between 3.5 and 4.5 degrees. In still other embodiments, the second seal 9028 is engaged between a gate angle 9060 of 0 degrees and 6 degrees. In still other embodiments, the second seal 9028 is engaged between a gate angle 9060 of 0 degrees and 5 degrees. In still other embodiments, the second seal 9028 is engaged between a gate angle 9060 of 0 degrees and 4.5 degrees. In still other embodiments, the second seal 9028 is engaged between a gate angle 9060 of 0 degrees and 4 degrees.

During operation, the valve 9000 is in the open position (see FIG. 53) while the vacuum assembly 104 is in the standard vacuum configuration. As such, air flows through the transition passage 3262 in a first direction A. In the illustrated embodiment, the gate 9008 forms a 90-degree gate angle 9060 when in the open position to maximize the airflow therethrough.

When entering the general cleaning configuration from the standard vacuum configuration, the unlock lever 4366a is rotated from the first position to the second position causing the gate 9008 to move from the open position (see FIG. 53) to the closed configuration (see FIG. 58). When doing so, the rotation of the unlock lever 4366a causes the gate 9008 to rotate with respect to the seat 9004 about the valve axis 9002 such that the gate angle 9060 begins to decrease.

As the gate angle 9060 continues to decrease, the gate 9008 approaches and enters the second intermediate position (see FIG. 60). By doing so, the distal edge 9094 of the second seal 9052 engages and forms the second seal 9028 with the second sealing surface 9016b of the seat 9004. In the illustrated embodiment, the gate 9008 enters the second intermediate position when the gate angle 9060 is approximately 4 degrees (±0.25%, ±0.5%, ±0.75%, ±1%, ±2%).

After entering the second intermediate position (see FIG. 60), the gate angle 9060 continues to decrease until the gate 9008 approaches and enters the first intermediate position (see FIG. 59). By doing so, the third sealing surface 9084 engages and forms the first seal 9024 with the first sealing surface 9016a. In the illustrated embodiment, the gate 9008 enters the first intermediate position when the gate angle 9060 is approximately 1.5 degrees (±0.25%, ±0.5%, ±0.75%, ±1%, ±2%).

After entering the second intermediate position (see FIG. 59), the gate angle 9060 continues to decrease until the gate 9008 enters the final closed position. By doing so, both the first and second seals 9024, 9028 are engaged and the unlock lever 4366a locked in place. In the illustrated embodiment, the gate 9008 enters the closed position when the gate angle 9060 is approximately 0 degrees (±0.25%, ±0.5%, ±0.75%, ±1%, ±2%).

With the gate 9008 in the closed position, the vacuum assembly 104 then enters the general cleaning configuration. The vacuum assembly 104 can then be placed in either the first or second filter cleaning configurations as discussed above. When operating in one of the first and second filter cleaning configurations, a relatively low pressure zone is generated downstream of the gate 9008. This low pressure zone, in turn, attempts to bias the gate 9008 toward the open position (e.g., attempts to increase the gate angle 9060) generally producing an oscillating condition of a given angular magnitude. In older designs, this oscillating condition and accommodating losses in seal integrity produce an undesirable audible sound. In contrast, due to the two-seal design of the illustrated gate 9008, the gate 9008 can withstand a relative larger angular magnitude oscillation and still maintain overall seal integrity. As such, the undesirable sound condition is not produced. In the illustrated embodiment, the gate 9008 can undergo an angular oscillation of up to 4 degrees of deflection (±0.25%, ±0.5%, ±0.75%, ±1%, ±2%) before seal integrity is lost and the undesirable audible sound is produced.

Clause 1. A filter assembly for use with an air-moving device having a power head with a blower assembly, the filter assembly comprising: a housing defining a housing volume, wherein the housing includes a first connection interface configured to attach to the power head and a second connection interface configured to attach to the blower assembly; a discharge air port open to the first connection interface; a first filter region coupled to the housing, wherein a first valve is positioned in a passageway extending between the first filter region and the exterior of the housing, and wherein a second valve is positioned in a passageway extending between the first filter region and the discharge air port; and a second filter region coupled to the housing, wherein a third valve is positioned in a passageway extending between the second filter region and the exterior of the housing, and wherein a fourth valve is positioned in a passageway extending between the second filter region and the discharge port; wherein the filter assembly is operable in a first configuration, in which the first valve is closed, the second valve is open, the third valve is closed, and the fourth valve is open, and wherein the filter assembly is operable in a second configuration, in which the first valve is open, the second valve is closed, the third valve is closed, and the fourth valve is open.

Clause 2. The filter assembly of clause 1, wherein the filter assembly is also operable in a third configuration in which the first valve is closed, the second valve is open, the third valve is open, and the fourth valve is closed.

Clause 3. The filter assembly of clause 1, further comprising an inlet air passageway having a distal end open to the second connection interface, wherein the inlet air passageway has a fifth valve positioned therein to control the flow of fluids therethrough, wherein the fifth valve is open when the filter assembly is in the first configuration.

Clause 4. The filter assembly of clause 3, wherein the fifth valve is closed when the filter assembly is in the second configuration.

Clause 5. The filter assembly of clause 1, further comprising a knob rotatably mounted to the housing and in operable communication with the first valve, the second valve, the third valve, and the fourth valve, and wherein rotating the knob relative to the housing causes at least one of the first valve, the second valve, the third valve, and the fourth valve to change between an open and closed configuration.

Clause 6. The filter assembly of clause 1, further comprising a collection container, wherein the discharge air port is configured to be in direct fluid communication with the blower assembly when the collection container is coupled to the second connection interface of the housing.

Clause 7. The filter assembly of clause 1, further comprising at least one component coupled to the housing sized to inhibit a filter of a power head from being coupled thereto, and a coarse filter configured to be positioned between the power head and the housing prior to coupling the power head to the housing, the coarse filter configured to inhibit large debris from moving from the housing into the power head.

Clause 8. An air-moving assembly comprising: a blower assembly having a blower inlet and a blower outlet; a first filter region in fluid communication with the blower inlet; a second filter region in fluid communication with the blower inlet; and a master control assembly configured to coordinate and control the flow of air through the first filter region and the second filter region, wherein the master control assembly is operable in a first configuration, in which air flows from the first filter region toward the blower inlet and from the second filter region toward the blower inlet, and wherein the master control assembly is operable in a second configuration, in which air flows from the first filter region toward the second filter region, and from the second filter region toward the blower inlet.

Clause 9. The air-moving assembly of clause 8, wherein the first filter region, the second filter region, and the master control assembly are coupled to a first housing, wherein the blower assembly is coupled to a second housing, and wherein the first housing is detachable from the second housing.

Clause 10. The air-moving assembly of clause 8, further comprising an inlet passageway, wherein the inlet passageway has a first end open to the exterior of the vacuum assembly and a second end opposite the first end, and wherein the inlet passageway further includes a first valve positioned therein to control the flow of fluid through the inlet passageway.

Clause 11. The air-moving assembly of clause 10, wherein the first valve is in an open configuration when the master control assembly is in the first configuration.

Clause 12. The air-moving assembly of clause 10, wherein the first valve is in a closed configuration when the master control assembly is in the second configuration.

Clause 13. The air-moving assembly of clause 8, wherein the master control assembly includes a first valve positioned within a fluid passageway extending between the first filter region and the blower inlet, and a second valve positioned within a fluid passageway extending between the first filter region and the exterior of the vacuum assembly.

Clause 14. The air-moving assembly of clause 13, wherein the first valve and the second valve are in operable communication with each other such that opening of the first valve causes the second valve to close.

Clause 15. The air-moving assembly of clause 13, wherein the first valve and the second valve are mechanically linked so they move together as a single unit.

Clause 16. The air-moving assembly of clause 8, wherein the master control assembly is operable in a third configuration in which air flows from the first filter region toward the blower inlet and from the second filter region toward the first filter region.

Clause 17. The air-moving assembly of clause 13, further comprising a rotatable knob accessible by the user, and wherein rotating the knob causes at least one of the first valve and the second valve to change between an open configuration and a closed configuration.

Clause 18. The air-moving assembly of clause 13, further comprising an additional valve mechanically linked to the first valve and the second valve, the additional valve configured to reduce the force required to open the first valve.

Clause 19. The air moving assembly of clause 8, further comprising a collection container defining a collection volume, wherein the first filter region is in fluid communication with the collection volume, and wherein in the second configuration air flows from the first filter region toward the collection volume.

Clause 20. An air-moving assembly comprising: a collection container defining a collection volume; a blower assembly having a blower inlet and a blower outlet; a first filter region open to the collection volume; a second filter region open to the collection volume; a first fluid passageway extending between the exterior of the air-moving assembly and the collection volume, wherein the first fluid passageway has a first valve positioned therein to control the flow of fluid therethrough; a second fluid passageway extending between the first filter region and the exterior of the air-moving assembly, wherein the second fluid passageway has a second valve positioned therein to control the flow of fluid therethough; a third fluid passageway extending between the first filter region and the blower inlet, wherein the third passageway has a third valve positioned therein to control the flow of fluid therethrough; a fourth fluid passageway extending between the second filter region and the exterior of the air-moving assembly, wherein the fourth fluid passage has a fourth valve positioned therein to control the flow of fluid therethrough; a fifth fluid passage extending between the second filter region and the blower inlet, wherein the fifth passageway has a fifth valve positioned therein to control the flow of fluid therethrough; and a master control assembly in operable communication with the first valve, the second valve, the third valve, the fourth valve, and the fifth valve, wherein the master control assembly is configured to operate in a standard mode where the first valve is open, the second valve is closed, the third valve is open, the fourth valve is closed, and the fifth valve is open, and wherein the master control assembly is configured to operate in a second cleaning mode where the first valve is closed, the second valve is open, the third valve is closed, the fourth valve is closed, and the fifth valve is open.

Clause 21. The air-moving assembly of clause 20, wherein the master control assembly interconnects the first valve, the second valve, the third valve, the fourth valve and the fifth valve through a series of mechanical linkages.

Clause 22. The air-moving assembly of clause 20, wherein the master control assembly can be adjusted between the first configuration and the second configuration while the blower assembly is operating.

Clause 23. The air-moving assembly of clause 20, wherein the master control assembly can be adjusted between the first configuration and the second configuration without gaining access to the collection volume.

Clause 24. The air-moving assembly of clause 20, wherein the master control assembly does not require use of an electrical source.

Clause 25. The air-moving assembly of clause 20, wherein the first filter portion and the second filter portion are formed from a single filter element.

Clause 26. The air-moving assembly of clause 20, further comprising a flow diverter positioned between the first filter region and the second filter region such that a straight reference axis cannot contact the first filter region and the second filter region without also contacting the flow diverter.

Clause 27. The air-moving assembly of clause 20, further comprising a flow diver having a first portion and a second portion, and wherein the second portion at least partially overlaps one of the first filter region and the second filter region.

Clause 28. An air-moving unit comprising: a first airflow inlet and an airflow outlet defining an airflow path therebetween; a second inlet; a blower configured to move air along the airflow path; a filter positioned along the airflow path; a first actuator movable from a first position to a second position, while the first actuator is in the first position, air flows across the filter in a first direction in response to operation of the blower, and while the first actuator is in the second position the first actuator causes the airflow inlet to be blocked to inhibit air flow across the filter in the first direction; and a second actuator moveable by a user from a first position to a second position, the second actuator configured to fluidly couple the second inlet with the filter such that air flows across the filter in a second direction, opposite the first direction in response to operation of the blower.

Clause 29. The air-moving unit of clause 28, wherein after the user has moved the first actuator and prior to the user actuating the second actuator, the blower is configured to increase a pressure differential across the blower.

Clause 30. The air-moving unit of clause 28, further comprising a collection container having a collection volume, the collection container configured to collect debris drawn into the airflow inlet by the blower.

Clause 31. The air-moving unit of clause 28, wherein the second actuator is inhibited from moving while the first actuator is in the first position.

Clause 32. The air-moving unit of clause 28, wherein the first actuator is pivotable between the first position and the second position, and wherein the second actuator is pivotable between the first position and the second position.

Clause 33. The air-moving unit of clause 28, wherein the filter is a first filter and further comprising a second filter, the blower configured to cause air to move across the second filter in a first direction while the first actuator is in the first position, and wherein while the first actuator is in the second position, the second actuator is further movable to a third position to fluidly couple the second inlet with the second filter such that air flows across the second filter in a second direction, opposite the first direction, in response to operation of the blower.

Clause 34. The air-moving unit of clause 28, wherein the first actuator is coupled to the second lever, and further comprising a release actuator to allow a user to decouple the first actuator from the second actuator to permit the user to rotate the first actuator.

Clause 35. The air-moving unit of clause 28, further comprising at least one coarse filter positioned in the airflow path, the coarse filter configured to inhibit flow of large debris therethrough.

Clause 36. A vacuum assembly comprising: a container defining a collection volume therein; a blower assembly in fluid communication with the collection volume; a passage extending between and open to the exterior of the vacuum assembly and the collection volume, wherein the passage includes a seat formed therein, wherein the seat has a first sealing surface and a second sealing surface; and a gate pivotably movable relative to the seat between an open position and a closed position, wherein the gate includes a first seal configured to selectively engage and form a first fluid-tight seal with the first sealing surface, and a second seal configured to selectively engage and form a second fluid-tight seal with the second sealing surface.

Clause 37. The vacuum assembly of clause 36, wherein the passage defines a passage axis extending therethrough, wherein the first sealing surface is oriented normal to the passage axis, and wherein the second sealing surface is oriented parallel to the passage axis.

Clause 38. The vacuum assembly of clause 36, wherein both the first seal and the second seal are engaged when the gate is in the closed position.

Clause 39. The vacuum assembly of clause 36, wherein the first sealing surface defines a first sealing plane, wherein the gate defines a body reference plane, wherein a gate angle is defined between the body reference plane and the first sealing plane, and wherein the first fluid-tight seal is engaged over a first angular range of the gate angle.

Clause 40. The vacuum assembly of clause 39, wherein the second fluid-tight seal is engaged over a second angular range of the gate angle that is different than the first angular range.

Clause 41. The vacuum assembly of clause 40, wherein the second angular range is approximately 4 degrees.

Clause 42. The vacuum assembly of clause 39, wherein the first angular range is approximately 1.5 degrees.

Clause 43. The vacuum assembly of clause 36, wherein the gate includes a gate body having an upstream end and a downstream end, and wherein the gate includes one or more ridges extending from the downstream end thereof.

Clause 44. The vacuum assembly of clause 39, wherein the gate includes a gate body having an upstream end and a downstream end, and wherein the first seal includes a planar piece of resilient material coupled to the upstream end.

Clause 45. The vacuum assembly of clause 45, wherein the first seal includes a third sealing surface configured to selectively engage the first sealing surface, and wherein the third sealing surface is coplanar with the body reference plane.

Clause 46. The vacuum assembly of clause 39, wherein the second seal includes a ridge extending outwardly from the body.

Clause 47. The vacuum assembly of clause 46, wherein the ridge extends outwardly from the body in a direction parallel to the body reference plane.

Clause 48. The vacuum assembly of clause 39, wherein the gate pivots relative to the seat about a gate axis, and wherein the gate axis is parallel to the body reference plane.

Clause 49. A vacuum assembly comprising: a container defining a collection volume therein; a blower assembly in fluid communication with the collection volume; a passage extending between and open to the exterior of the vacuum assembly and the collection volume, wherein the passage includes a seat formed therein that defines a seal reference plane; and a gate pivotably movable relative to the seat between an open position and a closed position, wherein the gate defines a body reference plane, and wherein a gate angle is defined between the body reference plane and the seal reference plane; wherein the gate forms a first fluid-tight seal with the seat that is engaged over a first angular range of the gate angle, and wherein the gate forms a second fluid-tight seal that is engaged with the seat over a second angular range of the gate angle that is different than the first angular range of the gate angle.

Clause 50. The vacuum assembly of clause 49, wherein the first angular range is approximately 1.5 degrees.

Clause 51. The vacuum assembly of clause 49, wherein the second angular range is approximately 4 degrees.

Clause 52. The vacuum assembly of clause 49, wherein both the first fluid tight seal and the second fluid-tight seal are engaged when the gate is in the closed position.

Clause 53. The vacuum assembly of clause 49, wherein the seat includes a first sealing surface and a second sealing surface, and wherein the gate forms the first fluid-tight seal with the first sealing surface and the second fluid-tight seal with the second sealing surface.

Clause 54. The vacuum assembly of clause 53, wherein the first sealing surface is oriented perpendicular to the second sealing surface.