JPH02195615A - Pushbutton switch - Google Patents

Abstract

PURPOSE:To lighten a switch by reducing the number of parts and reduce manufacturing cost by fixing a support part of a solid metallic plate compact to an opening edge of a housing, and by abutting a raised part of a folded part of the metallic plate compact on an inversion spring. CONSTITUTION:For a pushbutton switch, on the bottom of a housing 1 that has an opening 1a, two metallic pieces are buried that are separated to one another, and a part of both of the metallic pieces is exposed in the inner bottom surface of the housing 1 as fixed contacts 2, 3 respectively, from which a terminal 4 is extended to the outside of the housing 1. On the fixed contact 2, an inversion spring 5 is put, and is slightly separated from the fixed contact 3 in the center during non-operation however, when pushed from above to a certain degree, it is inversed and is contacted with the fixed contact 3. On the inversion spring 5, a solid metallic plate compact 10 that is folded at bending points 10a, is arranged. When the pressure operational force is given to a raised part 12a of the metallic plate compact 10 through a key top, the inversion spring 5 is inversed by a raised part 13a so as to conduct both of the fixed contacts 2, 3 for the state of switch 'on'.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a push button switch, also called a tact switch, which has a built-in reversing spring as a movable contact.

[Conventional technology]

FIG. 7 is a sectional view showing a conventional push button switch of this type.

In the figure, two metal pieces spaced apart from each other are buried in a housing 1 having an opening 1a, and a part of both metal pieces is exposed on the inner bottom surface of the housing 1 as a fixed contact 2.3. Terminals 4 are formed extending outward from the housing 1 from these fixed contacts 2.3. A reversing spring 5, which functions as a movable contact, is placed on the fixed contact 2. When not in operation, this reversing spring 5 is slightly separated from the central fixed contact 3, but when pushed in from above by a predetermined amount, It is reversed and contacts the fixed contact 3.

The stem 6 protruding into the opening la is movable up and down along the inner wall of the housing 1, and the lower end of the stem 6 is in constant contact with the reversing spring 5. A presser plate 7 having a through hole 7a is fixed to the end of the housing 1 on the opening 1a side, and restricts upward movement of the stem 6.

A push button switch having the above configuration generally has a coil spring 8
When the key top 9 is pushed in and the stem 6 is lowered by a predetermined amount, the reversing spring 5 reverses and contacts the fixed contact 3, so that both fixed contacts 2 and 3 are electrically connected. is turned on. Furthermore, when the pressing force on the key top 9 is removed, the reversing spring 5 uses its own elasticity to push up the stem 6 and separate it from the fixed contact 3, returning to the switch-off state, and the coil spring 8
The key top 9 is also pushed up to the initial position by the restoring force. The operator can clearly recognize the on/off switching by the click feeling accompanying the reversing operation of the reversing spring 5.

[Problem to be solved by the invention]

By the way, the above-mentioned conventional push button switch requires a stem 6 which is a resin molded body and a presser plate 7 to prevent the stem 6 from falling off, so the number of parts increases.
There was a problem that it was not easy to reduce costs.

Therefore, it is an object of the present invention to provide a push button switch which solves the problems of the prior art described above and which can reduce the number of parts and reduce costs.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a support part having a through hole, and a folded part that can be elastically deformed in a cantilever shape with respect to the support part by folding back an extension part from the support part, A single metal plate molded body is provided with a protrusion protruding toward the opposite side of the through-hole at a position corresponding to the through-hole of the folded part, and the supporting part of this metal plate molded body is attached to the opening of the housing. In addition to being fixed to the end portion, the raised portion of the folded portion is configured to abut against a reversing spring serving as a movable contact.

[Effect]

When a pressing force is applied to the folded part of the metal plate molded body to cause it to elastically deform, the raised part descends and reverses the reversal spring, and when the pressing force is removed, the folded part returns to its initial position by its own elasticity. Therefore, the number of parts and weight can be reduced compared to a configuration that incorporates a resin stem or presser plate.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Here, Fig. 1 is a sectional view of the entire push button switch, Fig. 2 is a plan view of the metal plate molded body used therein, Fig. 3 is an exploded plan view of the same, and Fig. 4 is an exploded side view of the same. 7, and the same reference numerals are given to the same members as in FIG.

The push-button switch shown in FIG. 1 has two metal pieces spaced apart buried in the bottom of a housing 1 having an opening 1a, and a part of both metal pieces serves as fixed contacts 2 and 3 inside the housing 1. Terminals 4 are exposed on the bottom surface and extend from these fixed contacts 2 and 3 to the outside of the housing l.

A reversing spring 5, which functions as a movable contact, is placed on the fixed contact 2. When not in operation, this reversing spring 5 is slightly separated from the central fixed contact 3, but when pushed in from above by a predetermined amount, It is reversed and contacts the fixed contact 3. A metal plate molded body 10, which is a single sheet folded at bending portions 10a and 10b, is arranged on the reversal spring 5, and the four corners of this metal plate molded body 10 shown in FIG. It is fixed to the end face on the opening la side of No. 1.

This metal plate molded body 10 is made of a highly elastic material such as phosphor bronze, and as is clear from the developed views in FIGS. 3 and 4,
A flat support part 11 having a through hole 11a, a first folded part 12 having a columnar raised part 12a and folded back in the direction of arrow A at a bent part 10a, and a circular raised part 13a. and a second folded part 13 which is folded back in the direction of arrow B at the bent part 10b, and a raised part 13a is located below the raised part 12a penetrating through the through hole 11a. The second folded portion 12.13 is supported by the bent portion 10a in a cantilever shape and is elastically deformed. and,
This metal plate molded body 10 has the four corners of the support part 11 fixed to the end surface of the housing 1 on the opening la side with the raised part 13a of the second folded part 13 in contact with the center part of the reversal spring 5. .

In the push button switch having the above configuration, when a pressing operation force is applied to the protrusion 12a of the metal plate molded body 10 via a key top (not shown), the first and second folded parts 12.13 are bent integrally, When the raised portion 13a has descended by a predetermined amount, the reversing spring 5 is reversed, and the double-ended fixed contacts 2.3 are brought into conduction and turned on. Furthermore, when the pressing operation force on the raised portion 12a is removed, the first and second folded portions 12
13 returns to the initial position by its own elasticity, and the reversing spring 5 separates from the fixed contact 3 and returns to the switch-off state. Therefore, even if a coil spring is not interposed between the push button switch and the key top, the first and second folded portions 1
The desired stroke characteristics are obtained by the elastic deformation of 2.13. It goes without saying that a click sensation can be obtained when the reversing spring 5 is reversed.

In this way, in the above embodiment, by using the metal plate molded body 10 having a predetermined shape, the resin stem and presser plate are not required, so that the number of parts and the weight of the push button switch can be reduced. ing. Moreover, this metal plate molded body 10 can be easily formed by simply punching or bending a hoop-shaped metal plate, so that the manufacturing cost of the push button switch can be significantly reduced.

In addition, in the above embodiment, the metal plate formed body 10 is folded at two places to relieve stress concentration on the folded part 10a, but in addition, as shown in the cross-sectional view and developed plan view of Fig. 5.6, Alternatively, a metal plate molded body 20 may be used in which the supporting part 21 having the through hole 21a and the folded part 22 having the raised part 22'a are folded in half at the bent part 20a. Accordingly, a metal plate molded body folded at three or more places may be used.

〔Effect of the invention〕

As explained above, according to the present invention, a metal plate molded body of a predetermined shape is used instead of a resin stem or a presser plate, so the number of parts is smaller than conventional products, it is lightweight, and the manufacturing cost is low. A push button switch can be provided.

[Brief explanation of the drawing]

1 to 4 relate to one embodiment of the present invention, in which FIG. 1 is a sectional view of the entire push button switch, FIG. 2 is a plan view of the metal plate molded body used therein, and FIG. The same development plan,
FIG. 4 is an expanded side view of the same, FIG. 5 is a sectional view of a metal plate molded body according to another embodiment of the present invention, FIG. 6 is an expanded plan view of the same, and FIG. 7 is a sectional view of a conventional push button switch. It is. ■...Housing, la...Opening, 2
．． 3. Old... Fixed contact, 5... Reversing spring, 10
．． 20... Metal plate molded body, 10 a, 10
b, 20 a-...-bent part, 11.21...
...Support part, lla, 21a...Through hole, 12
....First folded portion, 13...Second folded portion, L3a...Protruded portion, 22...
- Folded portion, 22a... raised portion. 11a: Through hole Fig. 1 Fig. 2 Fig. 3 Fig. 5 Fig. 2a Fig. 6

Claims (1)

[Claims] A fixed contact is exposed on the inner bottom surface of the housing having an open end, a reversal spring as a movable contact that contacts and separates from the fixed contact is disposed inside the housing, and a member that presses the reversal spring is held movably up and down. In a push button switch,
A support part having a through hole, and a folded part that can be elastically deformed in a cantilever shape with respect to the support part by folding back a portion extending from the support part, and the folded part is located at a position corresponding to the above-mentioned through hole. A single metal plate molded body having a protrusion projecting toward the opposite side of the hole is used, and the supporting part of the metal plate molded body is fixed to the open end of the housing, and the folded part is fixed to the opening end of the housing. A push button switch characterized in that a raised portion is brought into contact with the reversal spring.