JP2548307Y2 - Push button switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-button switch for switching by bringing one end of a coil spring into and out of contact with a clip-shaped fixed contact, and more particularly to the coil spring.

[0002]

2. Description of the Related Art A push-button switch of this type is provided with a slider as an operating body, a coil spring for returning the slider to an initial position, and the like on a wafer formed by inserting a clip-shaped fixed contact conducting with a terminal. The coil spring has a function as a movable contact, so that downsizing and a reduction in the number of parts are realized. That is, one end of the coil spring is linearly extended, and the extended portion comes into contact with or separates from the contact portion of the clip-shaped fixed contact as the slider moves up and down.

FIG. 3 is a partially cutaway perspective view showing a conventional example of such a push button switch, and illustrates two push button switches sharing a synthetic resin wafer and a cover.
Only one push button switch will be described to avoid complexity.

In FIG. 1, a wafer 1 is formed by inserting a metal plate such as phosphor bronze, and has a plurality of terminals 2 protruding from an outer wall surface thereof, and a plurality of terminals 2 urged on the inner bottom surface thereof. A clip-shaped fixed contact 3 is provided upright, which makes a pair of elastic pieces 3a and 3b serving as contact points. The coil spring 4 accommodated in the spring accommodating portion 1a of the wafer 1 is interposed in a compressed state between the inner bottom surface of the wafer 1 and the bottom surface of the slider 5 serving as an operating body.
Is formed with a linear extending portion 4a at one end thereof. The extension 4a is located between the elastic pieces 3a and 3b of the clip-shaped fixed contact 3 when not operated, and the bottom surface of the slider 5 is always in contact with the base of the extension 4a. A guide hole 6a for projecting the slider 5 is formed at a predetermined position of the cover 6 integrated with the wafer 1, and the slider 5 is moved up and down with respect to the wafer 1 by the cover 6 and the coil spring 4. It is freely held. Although not shown, the clip-like fixed contact 3
And the coil spring 4 are electrically connected to different terminals 2.

The push button switch configured as described above is
When the slider 5 is pushed from above the cover 6 against the elastic force of the coil spring 4, as shown in FIG.
Since the coil spring 4 is separated from the fixed contact 3 and the conduction of the different terminals 2 and 2 is released, switching from ON to OFF is performed. When the pressing force applied to the slider 5 is removed in this state, the slider 5 is automatically pushed up to the initial position by the elastic force of the coil spring 4, and the extension 4a is inserted between the elastic pieces 3a and 3b. As a result, the coil spring 4 and the fixed contact 3 come into contact with each other, so that the terminals 2 and 2 are electrically connected, and switching from OFF to ON is performed.

[0006]

By the way, this type of push button switch can reduce the number of parts by using a coil spring also serving as a movable contact, so that miniaturization can be promoted. However, the cost is increased in an actual production line. In order to realize the downsizing while suppressing the size, good assemblability is an essential condition. However, in the above-described conventional push button switch, the coil spring 4 that needs to be assembled into the wafer 1 in a compressed state often jumps out of the wafer 1 when assembled by a compressed repulsive force. Each time the assembly work is performed, it is necessary to confirm the axial direction of the coil spring 4 so that the side on which the extension 4a is not formed is placed on the wafer 1, which is preferable. Could not be expected to be easily assembled. That is, the conventional product has a disadvantage that the assembly cost is increased because the coil spring 4 hinders the assemblability.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a push button switch which can easily and surely incorporate a coil spring serving also as a movable contact.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wafer having an upright clip-shaped fixed contact which makes a pair of resilient pieces urged against each other as a contact portion, and holds the wafer in a vertically movable manner. And a push button switch provided with a coil spring interposed between the slider and the wafer and also serving as a movable contact, wherein substantially the same linear extending portions are provided at both ends of the coil spring. A movable contact having one extended portion disposed inside the clip-shaped fixed contact at a position not in contact with the fixed contact, and the other extended portion inserted and removed between both elastic pieces of the fixed contact. Achieved by becoming a department.

[0009]

According to the above means, when the coil spring is incorporated into the wafer, first, one extension of the coil spring is inserted between the two elastic pieces of the clip-like fixed contact and arranged inside the fixed contact. Therefore, even if the coil spring attempts to jump out of the wafer with the repulsive force compressed thereafter, there is no danger of falling off since the coil spring is caught by the fixed contact. Therefore, the work of installing the coil spring can be performed without checking the axial direction.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a push-button switch according to the present invention, and FIG. 2 is an exploded perspective view of the push-button switch. Parts corresponding to those in FIG. It is. This embodiment is a part of a switch device incorporating three push-button switches of the same type, and FIG. 1 shows a cross section along the line AA in FIG. 2, and FIG. Details of the individual push button switches are not shown.

The push-button switch shown in FIGS. 1 and 2 has substantially the same linear extension portions 4a, 4a at both ends of a coil spring 4.
One of the extending portions 4a functions as a movable contact portion that is inserted and removed between the elastic pieces 3a and 3b, which are the contact portions of the clip-shaped fixed contact 3, as in the conventional example. However, the other extension 4b is disposed inside the clip-shaped fixed contact 3 at a position not in contact with the fixed contact 3.

That is, when incorporating the coil spring 4 into the spring accommodating portion 1a of the wafer 1, first, the lower extending portion 4
b is inserted between the elastic pieces 3a and 3b of the clip-shaped fixed contact 3 and disposed inside the fixed contact 3, and then the slider 5 and the cover 6 are assembled. While being compressed between the inner bottom surface and the bottom surface of the slider 5, the bottom surface of the slider 5 is brought into contact with the base of the upper extension 4a. The coil spring 4 thus assembled
Are positioned in the circumferential direction by engaging with the slider 5, there is no possibility that the lower extension 4b contacts the inner wall surface of the clip-shaped fixed contact 3, and the upper extension 4a There is no possibility that the fixed contact 3 will be largely displaced in the left-right direction in FIG. 1 with respect to the two elastic contact pieces 3a and 3b. The coil spring 4 and the fixed contact 3 are electrically connected.

Reference numeral 7 in the drawing denotes a contact plate extending from one of the three output terminals (not shown) and having the clip-shaped fixed contact 3 mounted thereon. .

The wafer 1, the clip-like fixed contact 3, the cover 6 and the like of the push button switch have slightly different shapes from those of the conventional example, but are functionally equivalent.
The description of those details is omitted. Furthermore,
The operation of this push button switch is the same as that of the conventional example.

In the above embodiment, when the coil spring 4 is assembled, the lower extension 4b is first inserted between the elastic pieces 3a and 3b of the clip-like fixed contact 3 so as to be inserted. Thereafter, even if the coil spring 4 tries to jump out of the wafer 1 by the compressed repulsive force, the coil spring 4 is caught by the fixed contact 3 so that the coil spring 4 can be prevented from falling off, and the coil spring 4 is securely incorporated into the spring accommodating portion 1a of the wafer 1. be able to. Also,
In the above embodiment, the extending portions 4a and 4b formed at both ends of the coil spring 4 have substantially the same shape, and any one of these extending portions 4a and 4b can be used as a movable contact portion. The assembling work of the coil spring 4 can be performed without confirmation. In addition, since the coil spring 4 can be easily and reliably assembled, the above-described embodiment has much better assemblability than the conventional example.

[0017]

As described above, in the push button switch according to the present invention, substantially the same linear extension portions are formed at both ends of the coil spring which also serves as the movable contact. It is not necessary to check the direction of the axial direction at the same time, and there is no danger of the coil spring falling off at the time of assembling because the one extending portion is arranged inside the clip-shaped fixed contact. This has an excellent effect that it can be reliably incorporated and the assemblability is greatly improved, which greatly contributes to reduction of manufacturing cost and promotion of miniaturization.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a push button switch according to the present invention.

FIG. 2 is an exploded perspective view of the push button switch shown in FIG.

FIG. 3 is a partially cutaway perspective view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wafer 3 Clip-shaped fixed contact 3a, 3b Elastic piece 4 Coil spring 4a, 4b Extension 5 Slider

Claims (1)

(57) [Scope of request for utility model registration] 1. A wafer having an upright clip-shaped fixed contact forming a pair of resilient pieces biasing each other as a contact portion, a slider held up and down with respect to the wafer, and a slider and the wafer. A coil spring interposed therebetween and also serving as a movable contact, wherein one end of the coil spring is inserted and removed between both elastic pieces of the clip-shaped fixed contact as the slider moves up and down. A linear extension having substantially the same shape is formed at each end of the coil spring, and one extension is disposed inside the clip-shaped fixed contact at a position not in contact with the fixed contact, and A push button switch, wherein the extension portion is a movable contact portion inserted and removed between both elastic pieces of the fixed contact.