Paddle switch assembly

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

Embodiments of the invention are generally directed to an electrical switch assembly and, more particularly, to a wall-mounted switch assembly having a contoured paddle and a correspondingly contoured faceplate.

2. Description of Related Art

Rocker switch assemblies are well known in the art especially in terms of internal components for actuating a single pole or three-way wall-mounted residential switch, for example. From a cosmetic point of view, the rocker or paddle as it is often referred to, for actuating the switch connection, generally has a concave style shape in the longitudinal direction resembling a shallow saucer, or two generally flat regions inclined inwardly to form the shape of a shallow V. Presumably, the generally concave shape of the paddle presents an ergonomic design lending itself to ease of manipulation for turning the switch on and off.

Although the design styles of the rocker switch assemblies described herein above are entirely satisfactory from a functional standpoint, they may not provide an appearance that is architecturally compatible with certain design or decorating trends in commercial and/or residential buildings.

Accordingly, the inventor has recognized that an alternative rocker switch assembly design may fill a gap in the commercially available array of products.

SUMMARY OF THE INVENTION

An embodiment of the invention is directed to a rocker switch assembly that includes a switch body having switch contacts, a mounting strap engaged with the switch body, a frame attached to the switch body, and a paddle for actuating the switch between an on and an off position. According to the embodiment, the paddle has a pivot structure on a side surface thereof that cooperatively engages a corresponding structure on the frame to provide a pivoting motion of the paddle in the longitudinal direction upon external pressure being applied to the paddle surface. The paddle also includes one or more portions that cooperatively engage with the frame to limit the range of pivotal motion of the paddle between a forwardly tilted position and a rearwardly tilted position. The paddle further includes a structure that opens and closes the electrical contacts of the switch body depending upon the forwardly tilted or rearwardly tilted position of the paddle. The paddle has a uni-convex cylindrical exterior surface having a curvature, R_p. The paddle further has a contiguous circumferential surface including opposing side portions and opposing upper and lower portions wherein the upper and lower portions have a transverse (cross sectional) profile defined by a curvature, R_B, the center of which lies along a pivot axis of the paddle.

In an aspect of the embodiment, the rocker switch assembly further includes a faceplate in the form of a frame having an opening, the perimeter of which is defined by upper and opposing lower inner surfaces and left and opposing right inner surfaces. The exterior front surface of the faceplate has a uni-convex cylindrical surface profile having a curvature, R_f. An axial centerline of the faceplate opening intersects an axial centerline of the paddle at a constant location along the pivot axis. Both the upper and opposing lower inner surfaces of the faceplate opening perimeter have a transverse (cross sectional) curvature defined by a radius of curvature, R_A, the center of which is the same as the origin of R_B.

In an assembled condition, the paddle substantially occupies the faceplate opening. Due to the selected radii of curvatures R_p and R_f, a portion of the longitudinal cross sectional profile of the paddle will be substantially tangent to a corresponding portion of a cross sectional profile of the faceplate surface when the paddle is either in the forwardly tilted position or the rearwardly tilted position. That is to say, at least a portion of the paddle front surface is always substantially flush with a portion of the faceplate surface and at no time does any part of the paddle surface protrude past the faceplate front surface. The tolerances between the perimeter paddle surfaces and inner perimeter faceplate surfaces provided by the radii of curvature R_B and R_A and their common origin contribute to the flush operational engagement between the paddle and the faceplate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side elevation view of a rocker switch assembly according to an embodiment of the invention;

FIG. 2 is a schematic perspective view of a rocker switch assembly according to an embodiment of the invention;

FIG. 3 is an exploded schematic view of a rocker switch assembly according to an embodiment of the invention;

FIG. 4A is a side-elevational view partly in cross section of a rocker switch assembly according to an embodiment of the invention;

FIG. 4B shows the assembly of FIG. 1A with the paddle component in a different switch position;

FIG. 5 is a schematic perspective view of a faceplate component of the rocker switch assembly according to an embodiment of the invention;

FIGS. 6(a–f) are various views of the faceplate shown in FIG. 7; and

FIGS. 7(a–f) are various views of a sub plate component of a rocker switch assembly used in conjunction with the faceplate component of FIG. 7 according to an embodiment of the invention.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION

An embodiment of the invention is directed to a rocker switch assembly 10 as illustrated in FIGS. 1 and 2. Referring to FIG. 3, the rocker switch assembly includes a switch body 12 including switch contacts 14, a mounting strap 16 that engages the switch body, a frame 18 attached to the switch body, and a paddle 20 including an actuating arm 24 for enabling or disabling the switch contacts. The paddle 20 includes a pivot structure 22 on a lateral side surface thereof in the form of a rounded knob 23 that cooperatively engages a portion of the frame and provides quasi-rotational movement of the paddle about a pivot axis 98. The paddle further includes a switch actuating structure 24 integrally attached to a rear surface of the paddle. The actuating structure has a distal end 25 that operationally enables an open-switch condition and a closed-switch condition. Top lateral surface 38 and bottom lateral surface 39 of the paddle 20 each include a slot 47 that cooperatively engages a surface ridge 49 on the frame to limit the rotational motion of the paddle between a fixed forwardly tilted position represented by 32a in FIG. 4A and a fixed rearwardly tilted position as illustrated by 32b in FIG. 4B. The paddle has a front surface 42 having a generally convex longitudinal profile with a curvature defined by R_p as illustrated in FIGS. 1 and 4. More particularly, the paddle has a uni-convex cylindrical exterior surface; i.e., it has a convex longitudinal profile and a flat transverse profile. As shown in FIG. 3, the side edges 51, 61 of the frame 18 have a similarly shaped profile.

The upper and lower lateral surfaces 38, 39 of the paddle 20, also referred to herein as the upper and lower circumferential surfaces of the paddle, each have a curvature of radius R_B as shown in FIGS. 1 and 4A. The radius R_B originates along the pivot axis 98 of the paddle. As further shown in FIGS. 1 and 4, in an assembled condition, the circumferential surfaces 38, 39 of the paddle 20 engage a space 52 between a portion 17 of the mounting strap 16 and a surface 19 of the frame 18 when the paddle is forwardly and rearwardly tilted.

According to an aspect of the embodiment as illustrated in FIG. 2, the paddle includes an indicia 74 that aides in recognition of switch status. For example, indicia 74 may be an indentation in the front surface 42 of the paddle that provides a tactile sensation to a user when operating the switch assembly. Alternatively, the indicia 74 may include a lens/LED combination that makes contact with an internal receptacle such that the indicia becomes illuminated when the switch is in either the on position or the off position. Various embodiments of an illuminated paddle are described in U.S. patent application Ser. No. 10/726,173 filed on Dec. 2, 2003, which is hereby incorporated by reference in its entirety to the fullest allowable extent. It will be appreciated that the instant invention, however, is not limited to the type or form of indicia described herein above.

Another embodiment according to the invention is directed to the rocker switch assembly 10 described above and further including a faceplate component 100 as illustrated, for example, in FIG. 7. The faceplate is in the form of a frame 102 having an opening 105 defined by the perimeter 104, including upper 111 and opposing lower 113 inner surfaces and left 115 and opposing right 117 inner surfaces. The faceplate 100, similar to the paddle, has an exterior front surface 120 having a uni-convex cylindrical exterior shape with a curvature R_f as further illustrated in FIGS. 4B and 6E. According to an aspect of the embodiment, the curvature R_f is not equal to the paddle curvature R_p.

FIGS. 6A–F and 7A–F show an exemplary embodiment of a faceplate component 100 and a sub-plate component 200 that provide a screwless or otherwise invisible attachment of the faceplate 100 to the switch assembly 10. Screwless faceplate components and assembly are described in U.S. application Ser. No. 10/723,202, which is hereby incorporated by referenced in its entirety to the fullest applicable extent. It will be appreciated, however, that the instant invention is not limited to a screw less or otherwise invisible faceplate assembly design.

As illustrated in FIGS. 4A and 4B, the upper and lower inner surfaces 111, 113, respectively, of the faceplate opening perimeter 104 have a curvature, R_A, having a radius origin along the pivot axis 98 coincident with the radius origin of the paddle edge curvature R_B. The common origin and radii values of the paddle and faceplate lateral surface curvatures provide consistent clearances between the paddle and the wall plate throughout the range of switching positions.

In an assembled condition, illustrated with the faceplate in cross section in FIGS. 4A and 4B, it can be seen that the centerline 131 of the faceplate opening 104 intersects the centerline 132 of the paddle at a constant intersection point 140 along the pivot axis 98. Due to the curvature values R_p and R_f of the paddle face 42 and the faceplate surface 120, respectively, at least a portion of the convex paddle profile is substantially tangent to a corresponding portion of the convex profile 120 of the faceplate surface, shown at T, when the paddle is either in the forwardly tilted position or the rearwardly tilted position. Based upon the contours of the paddle and the faceplate, and the limited rotational range of motion of the paddle, no portion of the paddle surface protrudes beyond the profile of the faceplate surface regardless of the paddle switch position.

The foregoing embodiments and aspects of the invention are disclosed herein by way of examples only and are not intended to limit the scope of the present invention, which is solely defined by the appended claims. A person of ordinary skill in the art will appreciate many variations and modifications within the scope of this invention.