INTERMITTENT ROTATION STRUCTURE FOR EXTENSION TOOL, AND EXTENSION TOOL

Description

TECHNICAL FIELD

The present application relates to the field of extension tool, in particular, relates to an intermittent rotation structure for extension tool and an extension tool.

BACKGROUND

Due to the rising cost of metal copper pipes, polymer pipe fittings are becoming increasingly popular in residential and commercial building structures. One of common types of polymer pipe fittings is made from cross-linked polyethylene, commonly known as PEX. The polymer pipe fittings have good toughness, utilizing the characteristics of slow contraction after the nozzle is expanded, they are connected to the joint before the nozzle is completely shrunk. After completely shrinking, the nozzle is tightly wrapped on the joint, the closer the expanded nozzle is to a circle, the better the airtightness between the joint and the connector. A typical building will have a plurality of joints, it can be seen that, the installation of the pipe fitting refers to expanding the nozzles of a plurality of pipes. At present, there is an extension tool on the market, during use, it is found that after the end of the extension tool is inserted into the pipe fitting, due to the extension tool is operated manually by the worker, that is, the extension tool is not easy to rotate, resulting in the expanded end of the pipe fitting to be non-circular in shape, which is caused by the shape of the conical extension head installed on the end of the extension tool. Therefore, when expanding the pipe fitting, the conical extension head is needed to be rotated, so that the pipe fitting is round in shape after being expanded, this facilitates the fitting and installation with the joint, ensuring that the expanded nozzle fits tightly with the joint. However, the conical extension head cannot be rotated all the time during the extension process, otherwise the extension of the pipe fitting cannot be realized, it is thus needed to provide an intermittent rotation structure for extension tool and an extension tool to solve the above problems.

SUMMARY

Therefore, it is necessary to provide an intermittent rotation structure for extension tool and an extension tool that are simple in structure, easy to operate, and effective to rotate the conical extension head.

In order to achieve the above object, the present application provides an intermittent rotation structure for extension tool, the intermittent rotation structure comprises: a rotary cam, a roller and an ejector pin, the roller is rotationally disposed at the tail of the ejector pin, the roller is in contact with the circumferential side wall of the rotary cam, the front end of the ejector pin is sleeved with a rotary sleeve, the tail of the ejector pin is sleeved with a guide sleeve, the outer side wall of the ejector pin disposed in the rotary sleeve and the guide sleeve is sleeved with a spring, the ejector pin moves along the direction of a guide groove disposed in the guide sleeve, a rotary gear is disposed on an outer side wall of the rotary sleeve in a transmission manner, a plurality of extending portions are disposed on the end face of the rotary sleeve close to the front end portion of the ejector pin;

an incomplete gear is disposed on an end face of the rotary cam, a first driven gear is disposed at one side of the incomplete gear in a transmission manner, an extension rod is disposed on the first driven gear, the extension rod extends to the rotary gear and is in transmission connection with the rotary gear by means of a second driven gear.

As a preferred embodiment of the present application, the incomplete gear is provided with a meshing tooth, the first driven gear comprises a first gear seat and a first driven tooth, which is disposed on the first gear seat and is in transmission connection with the meshing tooth on the incomplete gear.

As a preferred embodiment of the present application, the incomplete gear comprises a gear seat and a meshing tooth disposed on the gear seat, the meshing tooth is a conical tooth, the gear seat where the meshing tooth is located is provided with a notch, the side of the first gear seat is a regular polygon in shape, the first driven tooth is a conical tooth, the first driven tooth is in transmission connection with the meshing tooth.

As a preferred embodiment of the present application, the side of the first gear seat is in contact connection with the side surface of a side of the gear seat of the incomplete gear close to the meshing tooth, the corner of the two connecting sides of the first gear seat rotates in a transitional manner through the notch provided on the gear seat of the incomplete gear.

As a preferred embodiment of the present application, the regular polygon comprises a regular triangle, a regular quadrilateral, a regular pentagon, a regular hexagon, a regular heptagon and a regular octagon.

As a preferred embodiment of the present application, a first step is disposed on the rotary sleeve close to the rotary gear, a plurality of protruding portions are disposed on the first step, the inner wall of the rotary gear is provided with a plurality of slots, each of the plurality of slots is engaged with one of the plurality of protruding portions.

As a preferred embodiment of the present application, a gap is disposed between the side wall of the first step and the rotary gear, inclined surfaces are disposed on the side walls of the two sides of the plurality of extending portions disposed on the end surface of the rotary sleeve.

As a preferred embodiment of the present application, an end of the rotary sleeve close to the guide sleeve is fitted inside the guide sleeve.

As a preferred embodiment of the present application, a second step is disposed on the inner side wall of an end of the rotary sleeve close to the guide sleeve, a third step extending outward is disposed on the rear end of the ejector pin, the two ends of the spring are respectively abutted against the second step and the third step.

In order to achieve the above object, the present application further provides an extension tool, the extension tool comprises the intermittent rotation structure for extension tool described in any one of the aforementioned contents of the invention, and the extension tool further comprises a casing, a fixed sleeve and a conical extension head, the intermittent rotation structure for extension tool is disposed in the casing, the front end of the ejector pin and the rotary sleeve extend from the casing, the fixed sleeve is sleeved on the rotary sleeve and is fixedly connected with the casing, the conical extension head is movably and detachably disposed on the fixed sleeve, the ejector pin is configured to expand the conical extension head.

Different from the prior art, the beneficial effects achieved by the aforementioned technical solution are as follows: with the setting of the incomplete gear in the present structure and the coordination with the first driven gear, the intermittent transmission is effectively realized. When the meshing teeth of the incomplete gear meshes with the first driven gear, the first driven gear is driven to rotate a certain angle, which further drives the extension rod and the second driven gear to rotate intermittently, and further driving the rotary gear to rotate intermittently, the rotary gear drives the rotary sleeve to rotate intermittently, and the rotary sleeve drives a conical extension head to rotate intermittently, thus effectively realizing the intermittent rotation of the conical extension head, making the expanded part of the pipe fitting be in a circular shape, which is easier to match with the joint, it also avoids the problems such as poor fitting of non-circular shapes and leakage. In addition, the intermittent rotation structure is not only simple in structure, but also easy to operate, without requirements for an additional power source.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of the intermittent rotation structure for extension tool described in the specific embodiment;

FIG. 2 is a cross-sectional view of the intermittent rotation structure for extension tool described in the specific embodiment;

FIG. 3 is a schematic structural diagram of the incomplete gear described in the specific embodiment;

FIG. 4 is a schematic structural diagram of the installation structure of the incomplete gear and the first driven gear described in the specific embodiment;

FIG. 5 is a schematic structural diagram of the installation structure of the rotary sleeve described in the specific embodiment;

FIG. 6 is a schematic structural diagram of the installation structure of the rotary sleeve described in the specific embodiment;

FIG. 7 is a schematic structural diagram of the installation structure of the conical extension head described in the specific embodiment;

FIG. 8 is a cross-sectional view of the extension tool described in the specific embodiment.

EXPLANATION OF REFERENCE SIGNS

101, rotary cam; 102, rotating shaft; 103, bearing; 104, casing; 105, fixed sleeve; 106, conical extension head; 107, engaging place; 201, roller; 202, spring; 301, ejector pin; 302, third step; 401, rotary sleeve; 402, extending portion; 403, inclined surface; 404, first step; 405, protruding portion; 406, second step; 501, guide sleeve; 502, guide groove; 601, rotary gear; 602, slot; 7, incomplete gear; 701, gear seat; 702, meshing tooth; 703, notch; 801, first driven gear; 8011, first gear seat; 8012, first driven tooth; 802, extension rod; 803, second driven gear; 901, gap.

IMPLEMENTATIONS OF THIS APPLICATION

To provide a detailed explanation of the technical content, structural features, objectives, and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.

As shown in FIG. 1 and FIG. 2, the present embodiment provides an intermittent rotation structure for extension tool, the extension tool comprises: a rotary cam 101, a roller 201 and an ejector pin 301, the roller 201 is rotationally disposed at the tail of the ejector pin 301, the roller 201 is in contact with the circumferential side wall of the rotary cam 101, the front end of the ejector pin is sleeved with a rotary sleeve 401, the tail of the ejector pin is sleeved with a guide sleeve 501, the outer side wall of the ejector pin disposed in the rotary sleeve and the guide sleeve is sleeved with a spring 202, the ejector pin moves along the direction of a guide groove 502 disposed in the guide sleeve, a rotary gear 601 is disposed on an outer side wall of the rotary sleeve in a transmission manner, a plurality of extending portions 402 are disposed on the end face of the rotary sleeve close to the front end portion of the ejector pin; an incomplete gear 7 is disposed on an end face of the rotary cam, a first driven gear 801 is disposed at one side of the incomplete gear 7 in a transmission manner, an extension rod 802 is disposed on the first driven gear, the extension rod extends to the rotary gear and is in transmission connection with the rotary gear 601 by means of a second driven gear 803.

In this embodiment, when the rotary cam 101 rotates, the roller 201 rolls along the circumferential side wall of the rotary cam, thereby driving the ejector pin to move back and forth in the rotary sleeve and the guide sleeve, when the roller rolls to the protruding portion of the rotary cam, the ejector pin extends out from the rotary sleeve, at this time, the front end of the ejector pin 301 drives the conical extension head to expand to realize the extension of the pipe fitting. In this embodiment, the conical extension head 106 adopts the existing conical extension 106, as shown in FIG. 7 and FIG. 8. With the rotation of the rotary cam, the roller gradually rolls to the recessing portion of the rotary cam, at this time, the ejector pin 301 is retracted from the conical extension head. After the conical extension head shrinks and changes the position, with the continuous reciprocating motion of the ejector pin, the extension of the end of the pipe fitting is realized. In this embodiment, in order to ensure that the pipe fitting is as round as possible after extension, the pipe fitting is mated with the joint more precisely, thereby preventing leakage during later use. In this embodiment, the intermittent rotation structure is set, the first driven gear 801 is driven by the incomplete gear 7, and then the extension rod 802 and the second driven gear 803 are driven, the second driven gear drives the rotary gear to rotate intermittently, thereby driving the rotary sleeve to rotate, the intermittent rotation between the rotary sleeve and the conical extension head is realized. Each time the pipe is extended, the rotary sleeve drives the conical extension head to rotate a certain angle, the pipe fitting is expanded again after the conical extension head changes the position, so that the pipe fitting is as round as possible after extension, thereby the pipe fitting and the joint can be better matched.

In the aforementioned embodiment, as shown in FIG. 7 and FIG. 8, the rotary cam is in transmission connection with the motor (not shown in the figure) in the extension tool through a rotating shaft 102, the two ends of the rotating shaft 102 are fixed in the casing 104 through a bearing 103. When the motor starts operating and drives the rotating shaft 102 to rotate, the rotary cam rotates accordingly and begins to operate.

In the aforementioned embodiments, as shown in FIG. 2, an end of the rotary sleeve 401 close to the guide sleeve 501 is fitted inside the guide sleeve. A second step 406 is disposed on the inner side wall of an end of the rotary sleeve 401 close to the guide sleeve, a third step 302 extending outward is disposed at the rear end of the ejector pin, the two ends of the spring 202 are respectively abutted against the second step and the third step 302.

As shown in FIG. 3 and FIG. 4, in this embodiment, the incomplete gear 7 is provided with a meshing tooth 702, the first driven gear 801 comprises a first gear seat 8011 and a first driven tooth 8012, which is disposed on the first gear seat and is in transmission connection with the meshing tooth on the incomplete gear. In this embodiment, the incomplete gear 7 comprises a gear seat 702 and a meshing tooth 701 disposed on the gear seat, the meshing tooth is a conical tooth, the gear seat 702 where the meshing tooth is located is provided with a notch 703, the side of the first gear seat is a regular polygon in shape, the first driven tooth is a conical tooth, the first driven tooth is in transmission connection with the meshing tooth. In this embodiment, the meshing force can be effectively improved by setting the meshing tooth 701 and the first driven tooth 8012 as conical tooth, so that the transmission is more stable. The side of the first gear is set as regular polygon, so that when the meshing tooth is not meshed with the first driven gear, the side of the first gear can be in contact connection with the side surface of the gear seat, at this time, the gear seat can position the first driven gear and preventing the first driven gear from rotating, further improving the stability of the structure, and also preventing deviation of the meshing between the meshing tooth and the first driven gear after the first driven gear rotates, which would otherwise cause the frequency and the time interval of the extension of the rotary sleeve to the conical extension head to be uneven, resulting in poor extension effect, and damage of the extension tool in severe case.

In different embodiments, the meshing tooth of the incomplete gear can also be disposed in several places as required, and at this time, each of the gear seats where the meshing tooth is located is provided with a notch 703.

In the aforementioned embodiment, the side of the first gear seat is in contact connection with the side surface of a side of the gear seat of the incomplete gear close to the meshing tooth, the corner of the two connecting sides of the first gear seat rotates in a transitional manner through the notch provided on the gear seat of the incomplete gear. In this embodiment, the setting of the notch on the gear seat is to achieve that the corner of the two connecting sides of the first gear seat of the regular polygon can just pass through the notch to rotate from the previous side to the next side, one intermittent rotation is thus realized. When the meshing tooth completes one meshing with the first driven tooth, the meshing tooth is separated from the first driven tooth, at this time, the gear seat of the incomplete gear is in contact with the side of the first gear seat of the first driven gear, achieving the positioning of the first driven gear. When the meshing gear meshes with the first driven gear again, the first driven gear completes a certain angle of rotation.

In the above embodiments, the regular polygon comprises a regular triangle, a regular quadrilateral, a regular pentagon, a regular hexagon, a regular heptagon and a regular octagon. In different embodiments, it can also be other regular polygons. In this embodiment, as shown in FIG. 4, the regular polygon is a regular pentagon.

As shown in FIG. 5 and FIG. 6, in this embodiment, a first step 404 is disposed on the rotary sleeve close to the rotary gear, a plurality of protruding portions 405 are disposed on the first step, the inner wall of the rotary gear is provided with a plurality of slots 602, and each of the plurality of slots is engaged with one of the plurality of protruding portions 405. In this embodiment, the rotary sleeve 401 is in transmission connection with the rotary gear 601 through the slots and the protruding portions.

In some embodiments, as shown in FIG. 6 and FIG. 7, in order to achieve bidirectional pipe fitting detachment, that is, during the process of using the extension tool, due to the reciprocating motion of the ejector pin, the rotary sleeve will move forward, when the rotary sleeve is always disposed at the top position, it will cause the rotary sleeve to remain engaged with the conical extension head, so that the conical extension head cannot be separated from the pipe fitting. In this embodiment, the structure of bidirectional pipe fitting detachment is provided, that is, a gap 901 is disposed between the side wall of the first step and the rotary gear, and inclined surfaces are disposed on the side walls of the two sides of a plurality of extending portions disposed on the end surface of the rotary sleeve. In this embodiment, when the rotary sleeve and the conical extension head are always engaged, and the conical extension head cannot be detached from the pipe fitting, at this time, the body of the extension tool can be twisted in both directions, at this time, the inclined surface 402 disposed on the end surface of the rotary sleeve will separate from the engaging place 107 (as shown in FIG. 7) of the conical extension head 106, so that the rotary sleeve moves backward. The gap disposed between the side wall of the first step and the rotary gear provides a space for the rotary sleeve to move backward, therefore, the effect of bidirectional pipe fitting detachment is effectively achieved.

As shown in FIG. 7 and FIG. 8, the present embodiment further provides an extension tool, the extension tool comprises the intermittent rotation structure for extension tool described in any one of the aforementioned embodiments, and the extension tool further comprises a casing 104, a fixed sleeve 105 and a conical extension head 106, the intermittent rotation structure for extension tool is disposed in the casing, an ejector pin and a front end of a rotary sleeve extend from the casing, the fixed sleeve is sleeved on the rotary sleeve and is fixedly connected with the casing, the conical extension head is movably and detachably disposed on the fixed sleeve, the ejector pin is configured to expand the conical extension head.

It should be noted that although the foregoing embodiments have been described herein, the scope of protection of the present invention is not limited thereby. Therefore, based on the innovative concept of the present application, the changes and modifications made to the embodiments described herein, or the equivalent structure or equivalent process transformation made by using the description of the present application and the contents of the accompanying drawings, directly or indirectly applying the above technical solutions in other related technical fields, all are included in the patent protection scope of the present application.