JPH0339879Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a push button device for a push switch.

In a push switch used for tuning audio products, adjusting volume, etc., a push button having an operating shaft is fitted into a push button support frame fixed to a front panel so as to be slidable in the direction of the center axis of the operating shaft, The pushbutton is pushed in the operating direction by pushing the pushbutton decoration plate provided on the front of the support frame, that is, the decorative nameplate, and its operating shaft moves the switch body installed on the printed circuit board on the back of the panel. There is a so-called momentary type switch in which a plunger is pressed into the switch body to turn it on and off. This allows the push button to be pushed using the rotation of the name plate about the fulcrum caused by the push-in operation, that is, its snap action. However, in this type of conventional pushbutton structure, the distance from the rotation fulcrum of the decorative nameplate to the central axis along the operating direction of the switch body is short, and the distance along the operating direction of the pushbutton, that is, the push-in position of the decorative nameplate. If the distance from the switch body to the operating surface of the switch is long, simply fitting and supporting the push button on the support frame will cause the push button's operating shaft to rotate around the nameplate's fulcrum, causing its tip to The switch moves circularly in the direction of operation, resulting in insufficient stroke relative to the switch body, making it impossible to operate the switch reliably and smoothly, and in extreme cases, causing the problem that the switch cannot be operated at all.

This idea was made to solve the above-mentioned conventional problems, and it is a momentary type push switch that uses the snap action of the decorative name plate provided on the front of the push button to turn on and off the switch body. To provide a push button device that ensures reliable and smooth switch operation by ensuring that the circular motion around the fulcrum caused by pushing the decorative nameplate is converted into linear motion of the push button along the central axis of the switch body. The purpose is to provide.

Hereinafter, one embodiment of this invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show the overall configuration of a push switch according to this invention. In the figure, 10
11 is a decorative panel constituting the front of an audio product such as an amplifier, tuner, or cassette deck, and 11 is a mounting board for the switch body that is arranged parallel to the back of this panel 10 at a predetermined distance. It is formed.

The mounting position of the push button is determined in the panel 10, and a mounting hole 12 is formed at this mounting position to which a support frame for supporting the push button is mounted.

The support frame 13 is formed into a substantially rectangular frame shape by resin molding or the like, and has a pair of push button mounting recesses 131, 131 separated by a partition wall 130 on the front surface, and a panel 1 on the outer peripheral edge thereof.
A flange portion 132 is formed to protrude from the periphery of the mounting hole 12 on the rear surface. Mounting recess 13
A cylindrical guide portion 14 for guiding the operating shaft of the push button is formed protruding from approximately the center of each bottom surface of 1,131,
An insertion hole 141 through which the operating shaft is inserted and supported is formed in the guide portion 14 so as to penetrate from the bottom of the recess 131 to its tip surface. A pair of support legs 15 are provided at two diagonal corners of the bottom surface of the support frame 13.
15 are provided protrudingly, and these supporting legs 15, 15 are connected to the substrate 1.
1 and then fix it with screws from the back of the board to connect the mounting board 11 and the support frame 13.
The parts are connected and fixed together.

The push button 16 is formed as a pair of left and right, and has a substantially rectangular flat plate shape with an operating shaft 17 integrally formed on the bottom surface thereof, and by inserting the operating shaft 17 into the insertion hole 141, it is fitted into the mounting recess 131 and supported. It is designed to be integrated into the frame 13. At the tip of the operating shaft 17, a slit 171 opening at the tip is formed with a predetermined width along the axial direction, and a locking piece 17 for preventing slipping out is provided on the outer periphery of the slit 171.
2, 172 is provided protrudingly, and when this operating shaft 17 is inserted into the insertion hole 141, its tip elastically contracts inward due to the gap formed by the slot 171, making its insertion easy. It is now possible to do this. When the distal end passes through the insertion hole 141, the distal end expands and returns elastically, and the locking pieces 172 are engaged with the distal end surface of the guide portion 14 to prevent it from coming off.

A decorative name plate 18 for decoration is attached to the front surface of the support frame 13. This decorative nameplate 18 has its central portion fixed on the partition wall 130 by adhesive or the like, and its back surfaces near both ends are joined to the front end faces of the push buttons 16, 16 by adhesive, pasting, or the like. This decorative nameplate 18 is made of, for example, a resilient metal material, and its surface is plated for decoration, and when pressed, the pushbutton 18 is moved around both edges P, P of the partition wall 130 as fulcrums. , 16 and rotates back to the original position by releasing the push-in, which is a so-called snap action operation. Then, the pushbutton 16 is pushed by a snap action action caused by pushing the decorative nameplate 18, and the operating shaft 17 is moved to the guide portion 14.
While sliding in the insertion hole 141, it performs a linear movement guided by the insertion hole 141, and projects along the central axis L toward the switch body with a predetermined stroke.

On the other hand, switch bodies 20, 20 are positioned and installed at predetermined positions on the mounting surface of the mounting board, that is, the printed circuit board 11, so as to correspond to the push buttons 16, 16 in pairs, and lead terminals 200,
200 is inserted into the board insertion hole and fixed by soldering on the back surface thereof. A plunger 21 is provided on the front surface of the switch body 20 so as to be slidable in the axial direction. The plunger 21 is always biased in the forward projecting direction, that is, in the return direction by a spring built into the main body.
The switch body 20 has a plunger 21 that is coaxial with the sliding center axis L of the operating shaft 17 and
The front operation surface of 1 is installed on the substrate 11 so as to be substantially perpendicular to the operation shaft 17. The tip of the operating shaft 17 extends to the position of the front operating surface of the plunger 21 and is opposed to and in contact with this operating surface. The operating shaft 17, that is, the push button 16 is always urged in the forward return direction by the return force of the plunger 21, and is placed at a position floating at a predetermined height above the bottom of the mounting recess 131 without being pushed.

In this way, the mounting board 11 on which the switch bodies 20, 20 are attached, the push buttons 16, 16 integrally having the operation shaft 17, and the decorative nameplate 18 are attached to the support frame 1.
3, and the push switch is assembled into one piece. Next, the flange portion 132 is installed at the periphery of the mounting hole 12 on the back side of the decorative panel 10 and fixed by adhesive or the like, the support frame 13 is fixed to the panel 10, and the installation of the push switch to the panel 10 is completed. together with pushbutton 1
6 and 16 are set in the mounting position of the panel 10 so as to be pushable. In this case, according to this example, the operation shaft 17 can be easily inserted into the insertion hole 141 formed in the guide portion 14 by elastic deformation due to the action of the slot 171 formed at the tip of the operation shaft 17, and Once inserted, the locking pieces 172, 172 protruding from the outer periphery ensure that the push buttons 16, 16 do not come off.
Falling off from 3 can be reliably prevented. Therefore,
When assembling this push switch or assembling it to the panel 10, the work can be proceeded without any special consideration such as the push button 16 falling out, and the assembly work can be performed easily.

Next, the operation of the push button device according to the present invention constructed as described above will be explained.

First, as shown in FIG. 3 from the state shown in FIG.
When the push button 16 is rotated using the fulcrum, the push button 16 is pushed, and the operating shaft 17 slides into the insertion hole 141 of the guide portion 14 as shown by the arrow 100, and is guided by the insertion hole 141 of the guide portion 14 to push the switch along the central axis L. It protrudes in the direction of the main body 20 with a predetermined stroke and pushes down the plunger 21 into the main body 20. Next, when the pressing of the name plate 18 is released, the name plate 18 rotates back to its original position using the edge P as a fulcrum, and the pressure on the plunger 21 by the operation shaft 17 is released, and the plunger 21 is moved by the bias of the spring. The push button 16 returns to its original state, and this return force causes the push button 16 to return to its original position as shown in FIG.
Thus, the pushbutton 16 is pushed by a snap action action using the edge P of the nameplate 18 as a fulcrum, and this pushbutton pushes the switch body 2.
0 on/off operation is performed.

In this case, the distance Y from the front end of the pushbutton 16 to the operating surface of the plunger 21 of the switch body is longer than the distance As a result, the tip of the push button 16 attempts to perform a circular motion with respect to the switch body 20 as the nameplate 18 is rotated about the fulcrum P. However, according to the device of this embodiment, since the operating shaft 17 is slidably guided by the insertion hole 141 of the guide portion 14 provided in the support frame 13, the circular motion of the nameplate 18 can be reliably converted into the linear motion of the operating shaft 17. As a result, the push button 16 can be reliably pushed in the direction of the switch body 20 along the central axis L, and problems in switch operation such as lack of stroke that have conventionally occurred are solved.

As described above, according to the push button device of the present invention, when the decorative nameplate is pushed in to operate the switch, the snap action action causes the operating shaft provided on the push button to move along with the switch body to the guide portion formed on the support frame. Therefore, the switch is guided to move in the direction of the operation axis of the switch, that is, the direction of the center axis of the switch, which is orthogonal to the front operation surface of the plunger.
The circular movement around the fulcrum caused by pressing the decorative nameplate is reliably converted into linear movement of the pushbutton and its operating axis in the direction of the switch's operating axis, and the stroke of the pushbutton relative to the switch body is also sufficient. Thus, the switch can be operated reliably and smoothly at all times. In addition, the locking piece provided on the outer periphery of the tip of the operating shaft prevents the operating shaft from coming off the guide part, so it is possible to reliably prevent the push button from falling off from the support frame.
Therefore, the assembly or attachment work to the front panel can proceed smoothly without considering the possibility of the push button falling off, etc., and the assembly work can be facilitated.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing the overall configuration of the proposed push button device, Fig. 2 is a sectional view showing its assembled state,
FIG. 3 is a sectional view showing the operating state of the device according to the present invention. DESCRIPTION OF SYMBOLS 10... Decoration (front) panel, 13... Support frame, 130... Partition wall, 131, 131... Mounting recessed part, 14, 14... Guide part, 141, 141...
...Through hole, 16, 16...Push button, 17, 17
...Operation axis, 11...Mounting board, 20...Switch body, 18...Decorative nameplate, P, P...Fully point, 2
1... Plungiya, 171... Suriwari, 17
2,172...Locking piece.

Claims (1)

[Claims for Utility Model Registration] (1) A mounting recess partitioned by a partition wall is formed on the front surface of the support frame to be mounted on the panel, and a guide portion having an insertion hole is formed protruding from the bottom of the mounting recess, and an operation A push button having a shaft is fitted into the mounting recess, and its operating shaft is fitted into the insertion hole of the guide part so as to be slidable in the switch operation direction, and a mounting board is mounted on the back of the support frame parallel to the panel. The switch body is installed and fixed on the mounting board so that the plunger faces and contacts the operating shaft coaxially and at a substantially right angle to the operating surface, and an elastic decorative name plate is attached to the front surface of the support frame. The push button is connected to a name plate, and the push button is movable along with the operating shaft in the direction of the switch operating axis of the switch body by a snap action action centered on the mounting fulcrum of the decorative name plate. push button device. (2) A slot opening at the tip is formed in the tip of the operating shaft, and a locking piece is protruding from the outer periphery of the tip to prevent it from coming off and engages with the tip surface of the guide. A push button device according to claim 1 of the utility model registration claim.