JPH0357564B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to a push button switch used for controlling power supply to various electronic devices such as audio devices.

(b) Background of the Invention Conventionally, this type of push button switch
For example, one end of a substantially W-shaped operating piece is locked to a corner of an inverted L-shaped fixed terminal, and a tension spring is provided stretched between the fixed terminal and the movable piece.
This spring force is applied to the operating piece via the aforementioned movable piece, while the other end of the operating piece is linked to the pressing operation of the plunger, and when the plunger is pressed, the coil spring provided on the plunger is compressed. , is provided with a switch mechanism configured to displace the aforementioned operation piece by the spring force of the spring, and press a contact provided at the free end of the movable piece to another fixed terminal facing the contact; It is known that the return position is determined by the balance between a spring and a tension spring.

However, in conventional push button switches, due to variations in the spring loads of the coil springs and tension springs or weakening of the spring force,
There have been problems in that the return position of the operating piece varies or a return failure occurs.

Furthermore, when the above-mentioned switch mechanism and plunger are installed together, the arc at the contact point of the switch mechanism acts on the plunger and partially melts it, which becomes a catch for the vertical movement of the plunger and smoothes the vertical movement of the plunger. Furthermore, when the plunger and the switch mechanism are assembled into the housing, they interfere with each other, making it difficult to assemble them smoothly.

(C) Purpose of the Invention This invention prevents the above-mentioned variations in the return position of the operating piece or the return failure, and allows the operating piece to reliably return at a predetermined stroke position, thereby improving the variation in the switching operating point. I can,
Another object of the present invention is to provide a push button switch that maintains a smooth state without impairing the vertical movement of the plunger due to the arc of the contact point, and furthermore, allows easy assembly of the switch mechanism and the plunger.

(d) Structure of the Invention This invention fixes a base in which a terminal is embedded in the bottom of a housing, and a switch mechanism and a plunger that moves up and down in conjunction with a pressing operation are provided on the upper surface of the base, and the above-mentioned A push button switch that operates the switch mechanism on and off by displacing an operating piece of the switch mechanism with the movement of a plunger,
The base is formed by combining two first and second bases, each of which is formed by integrating a terminal,
A partition wall is erected on one base to partition the upper surface of the base into a plunger chamber and a switch component chamber, and a through hole is formed in the upper part of the partition wall through which the end of the operating piece leads to the plunger chamber, and the plunger The push button switch is characterized in that it is integrally formed with a tapered forced return portion that comes into contact with the operating piece at a slope at a predetermined stroke position.

(E) Effects of the Invention According to the present invention, when the plunger returns to a predetermined position during the return stroke of the plunger, the tapered surface of the forced return portion integrally formed on the plunger comes into contact with the operation piece. Since this operation piece is forcibly returned to its normal state, it is possible to reliably prevent the return position of the operation piece from varying or failure to return, and the above-mentioned operation piece can be reliably returned at a predetermined stroke position. Moreover, since the tapered surface comes into contact with the operating piece, the contact becomes smooth and the return action is more stable, which has the effect of stabilizing the switch operating point over a long period of time.

Furthermore, the base of the switch has two parts, the first and the second.
Since it is divided into individual parts, the plunger and switch mechanism can be temporarily fixed and assembled in each part, making it easy to assemble into the housing, and automatic assembly is also possible.

Furthermore, since the plunger chamber and the switch mechanism are separated by a partition wall, it is possible to prevent arcs from the switch contacts from entering the plunger chamber, thereby preventing damage to the vertical movement of the plunger and ensuring smooth vertical movement of the plunger. It has the effect of maintaining the movement for a long period of time.

(F) Embodiment of the Invention An embodiment of the invention will be described in detail below based on the drawings.

The drawings show a push button switch, and in Figures 1 and 2, 1 is a housing made of synthetic resin;
This housing 1 has a lower cylindrical portion 2 and an upper rectangular cylindrical portion 3 integrally formed.

4 is a synthetic resin lamp case, this case 4
An LED 6 held in a holder 5 is attached to the lower part of the LED 6, and a cover 8 is fitted to the upper part with a light diffusing plate 7 interposed therebetween.

A unit 9 in which the above-mentioned elements 4 to 8 are integrated is slidably attached to the upper opening of the above-mentioned housing 1.

On the other hand, inside the cylindrical portion 2 of the aforementioned housing 1, there is a first base 11 with the terminal 10 integrated therein;
A second base 12 with integrated terminals 13 is attached.

On one first base 11, a switch mechanism 26 is located approximately in the center of the cylindrical portion 2 described above.
A partition wall 14 is erected to partition the partition wall 14, and a through hole 15 is formed on the partition wall 14 to lead out an operating piece 24 to the plunger 21 side. A bar-shaped locking portion 16 for locking is integrally formed of synthetic resin.

The aforementioned partition wall 14 divides the interior of the cylindrical portion 2 in the housing 1 into a plunger chamber 17 and a switch mechanism chamber 18, and one of the plunger chambers 17 has a
A plunger 21 with an alternate cam 20 pivotally attached to the protruding shaft 19 is disposed, and the other switch mechanism chamber 18
includes a movable piece 23 having a contact 22 at its free end;
A switch mechanism 26 consisting of a substantially W-shaped operating piece 24 and a tension spring 25 is provided.

One end 24a of the aforementioned approximately W-shaped operating piece 24 is locked to the inverted L-shaped terminal 13, and its middle portion is led out into the plunger chamber 17 through the aforementioned through hole 15, and this leading end is used for operation. The other end 24b of the piece 24
A coil spring 27 is stretched between the spring seat 21a and the above-mentioned spring seat 21a on the upper part of the plunger 21.

Furthermore, the above-mentioned locking angle 2 of the upper end of the plunger 21 is
8 to the protruding shaft 29 at the bottom of the lamp case 4,
The plunger 21 is configured to be linked to the pressing operation of the unit 9 described above.

Moreover, the plunger 21 has a tapered forced return portion 21 that comes into contact with the operation piece 24 at a predetermined stroke position of the plunger 21.
b is integrally formed.

In addition, in the figure, 30 and 31 are terminals for LED, and 32
is a mounting screw that is screwed into the threaded portion on the outer periphery of the cylindrical portion 2 described above.

The illustrated embodiment is configured as described above,
The action will be explained below.

Now, when the unit 9 is pushed down, the plunger 21 moves downward due to the engagement between the protruding shaft 29 and the locking angle 28, and the downward force of the plunger 21 is transmitted to the operating piece 24 via the coil spring 27. As a result, the operating piece 24 swings counterclockwise in FIG.
maintain the downward movement of.

As a result, as shown in FIG.
Since the movable piece 23 that is locked to is tilted and the contact point 22 at the lower end is pressed against the opposing terminal 10,
The switch changes from off to on, and LED6
emits light, and this state is maintained by the alternate cam 20.

When the plunger 21 is returned upward from the push-off position of the plunger 21 shown in FIG.
When the plunger 21 has returned by a predetermined stroke from the position shown in FIG. 3 to the position shown in FIG.
A tapered forced return portion 21b integrally formed with 1
comes into contact with the bottom surface of the operating piece 24, and this operating piece 24
As a result, as the plunger 21 returns upward, the operation piece 24 changes from the state shown in FIG. 4 to the state shown in FIG. 5, and the movable piece 23
When the switch is tilted, the switch changes from on to off.

In this manner, when the plunger 21 returns to the predetermined position shown in FIG. 4 during the above-mentioned return process of the plunger 21, the operation piece 24 is forcibly moved by the forced return portion 21b formed integrally with the plunger 21. It is possible to prevent the return position of the operating piece 24 from varying or from causing a return failure, and the above-mentioned operating piece 2 can be prevented from returning at a predetermined stroke position.
4 can be reliably restored.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view of a push button switch, FIG. 2 is an exploded perspective view of the switch, and FIGS. 3 to 5 are for explaining the return operation of the main parts. FIG. DESCRIPTION OF SYMBOLS 1... Housing, 10, 13... Terminal, 11... First base, 12... Second base, 14... Partition wall, 15
...Through hole, 17...Plunger chamber, 21...Plunger, 21b...Forced return part, 24...Operation piece, 26
...Switch mechanism.

Claims (1)

[Claims] 1. A base with a terminal implanted therein is fixed to the bottom of the housing, and a switch mechanism and a plunger that moves up and down in conjunction with a pressing operation are provided on the top side of the base, and the plunger is movable. A push-button switch for turning on and off the switch mechanism by displacing an operating piece of the switch mechanism, the base being formed by two first and second bases each formed with an integrated terminal. a partition wall that divides the upper surface of the base into a plunger chamber and a switch component chamber is erected on one base, and a through hole is formed in the upper part of the partition wall through which the end of the operating piece leads to the plunger chamber. A push button switch, wherein the plunger is integrally formed with a tapered forced return portion that comes into contact with the operation piece at a slope at a predetermined stroke position.