JPH11134966A - Push button switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economical push button switch with excellence in mass production by eliminating complicated assembling process of assembling a movable contact piece and an operational plate in a common terminal through a coil spring conventionally carried out in the case of a conventional push button switch and lessening the number of parts. SOLUTION: A movable contact piece 7 comprising a beam part 9 made of an elastic member and one end cantilever-fixed in a common terminal 18 is arranged and further an elastic tongue piece 11 comprising a second free end part 12 projected out of the free end part 10 of the movable contact piece 7 to be pushed by a plunger 5 is planted. Assembling of a push button switch comprising those pieces constituted in such a manner is extremely easily carried out and optimized to automated production. Moreover, since the number of the parts is lessened, the push button switch can be manufactured at low cost and high mass productivity.

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 used for electronic equipment, general-purpose machines, control devices, and the like.

[0002]

2. Description of the Related Art A micro switch contact mechanism of a conventional push button switch has a plate-like movable contact piece 6 as shown in FIG.
7 and a coil spring 79 for urging the movable contact 67 to the common terminal 78, and an operating plate 80 for switching the movable contact 67.

[0003]

In a conventional push button switch, there is a complicated process of assembling a movable contact piece and an operation plate to a common terminal via a coil spring, so that the yield is low due to difficulty in assembly. There are a productive problem that automation is difficult, and a cost problem that component costs are high due to the large number of components constituting the contact mechanism.

[0004]

According to the present invention, a movable contact piece of an elastic member cantilevered and fixed to a common terminal is provided, and furthermore, the movable contact piece protrudes from a free end of the movable contact piece and is pressed by a plunger. A resilient tongue having a free end is implanted.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A push button switch constructed as described above is extremely easy to assemble, is suitable for automation, and has a small number of parts, so that it is inexpensive and excellent in mass productivity. can do.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present embodiment will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing a first embodiment of a push-button switch according to the present invention, FIG. 2 is a cross-sectional view when the button is not operated, and FIG. 3 is a cross-sectional view when the button 1 is operated. In these figures, an N / O contact terminal 14 is disposed in the center of a base 20 and an N / C contact terminal 16 is connected to the N / O contact terminal.
The contact portions 17 and 15 are disposed above and below the O contact terminal 14 so as to face each other, and a common terminal 18 is disposed so as to face the N / C contact terminal 16 right and left around the N / O contact terminal 14. I have. The terminals 14, 16, 18 and the base 20 are firmly fixed by a retaining structure and adhesive fixing after press-fitting.

A movable contact piece 7 made of an elastic member such as phosphor bronze for a spring engages and recesses with a common terminal 18 to form a fixed end portion 8.
After forming the beam, a gentle arc-shaped beam 9
Is protruded in a cantilevered state to form a free end 10, and after bending about 180 degrees from the free end 10, an elastic tongue 11 is formed while standing up smoothly above the beam 9. Two free ends 12. And N /
Opposite contact portion 1 between C contact terminal 16 and N / O contact terminal 14
A movable contact 13 that switches back and forth between 5 and 17 is swaged to the free end 10 of the movable contact piece 7 to form a contact mechanism. Note that the movable contact piece beam portion 9 is formed to be slightly thin in order to reduce the concentrated stress applied to the fixed end 8 of the movable contact piece 7. In addition, as a method of fixing the movable contact piece 7 and the common terminal 18, other methods such as a caulking method and spot welding can be considered. Also, the elastic tongue 11 may be formed as a separate part, and a fixing method such as a caulking method or spot welding may be considered in the same manner as described above. After the plunger 5 fitted with the button 1 is vertically arranged on the housing 3, the base 20 is fitted and locked from the lower surface of the housing 3 by uneven fitting to constitute a push button switch.

[0008] The push-button switch thus constructed has a beam 9 of the movable contact piece 7 when the button is not operated.
Contact between the movable contact 13 and the N / C contact terminal contact portion 17 due to the bending stress of the common terminal 18 and the N / C contact terminal 16
Electrical continuity is ensured between them. Then, when the button 1 is pressed, the plunger 5 pushes down the second free end 12 of the elastic tongue 11 of the movable contact piece 7 and elastically deforms the movable contact piece beam 9 downward, so that the movable contact 13 becomes N The electrical path is switched from the / C contact terminal 16 to the N / O contact terminal 14, and when the pressing force of the button 1 is released, the movable contact piece 7 acts to restore the initial state.

Therefore, not only can the push button switch be provided inexpensively with a configuration having a very small number of parts, but also a switch sound is hardly generated, so that a quiet push button switch optimal for broadcast equipment and the like can be obtained. .

FIG. 4 shows a second embodiment of the push button switch according to the present invention.
FIG. 5 is an external perspective view of a movable contact piece 37 representing an embodiment, FIG. 5 is a cross-sectional view when the button is not operated, and FIG. 6 is a cross-sectional view when a button is operated. In these figures, the movable contact piece 37 is formed integrally with the common terminal 48, and the beam portion 39 of the movable contact piece 37 is gently curved upward and a drawn portion 53 is formed in a pan-like shape as a whole. I have. Other configurations are the same as those of the first embodiment.

When the movable contact piece 37 is switched from the state shown in FIG. 5 to the state shown in FIG. 6 in the push button switch configured as described above, the drawing portion 53 having a saucer shape is elastically inverted so that a clear switching feeling is achieved. Can be generated. In the above embodiment, the operation mode is described as a momentary type push button switch, but it can be applied to a lock type push button switch using a heart cam mechanism, an illuminated type push button switch, and further to a multi-pole type. It is.

[0012]

As described above, according to the present invention, the following effects can be obtained. (1) A movable contact piece of an elastic member fixed to a common terminal of a push button switch is provided, and a second free end projecting from a free end of the movable contact and pressed by a plunger from above is disposed. With the elastic tongue having, the complicated assembling process of assembling the movable contact piece and the operating plate to the common terminal via the coil spring in the conventional push button switch can be reduced, and the number of parts can be reduced. Thus, a push button switch excellent in mass productivity can be provided. (2) A movable contact piece of an elastic member fixed to a common terminal of the push button switch is disposed, and a second free end projecting from the free end of the movable contact and pressed by the plunger from above is disposed. Since the elastic tongue piece is formed, it is possible to obtain a quiet push button switch that hardly generates a switching sound of the switch and is optimal for a broadcast device or the like. (3) Since the beam portion of the movable contact piece of the push button switch is formed to be curved in a saucer shape, when the movable contact piece is switched, the saucer-shaped curved portion is elastically inverted to generate a clear switching moderation feeling. Therefore, two types of push button switches having different switching characteristics can be configured only by the difference of the movable contact pieces, and efficient inventory management by component integration can be performed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating a first embodiment of a push button switch according to the present invention.

FIG. 2 is a cross-sectional view of the first embodiment of the push-button switch of the present invention when it is not operated.

FIG. 3 is a sectional view showing a state in which a button of the first embodiment of the push button switch of the present invention is operated.

FIG. 4 is an external perspective view showing a movable contact piece of a push button switch according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a push-button switch according to a second embodiment of the present invention when it is not operated.

FIG. 6 is a sectional view showing a state in which a button of a second embodiment of the push button switch of the present invention is operated.

FIG. 7 is a sectional view illustrating an example of a conventional push button switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 button 2, 4 recessed part 3 housing 5 plunger 6, 21 convex part 7, 37, 67 movable contact piece 8, 38 fixed end part 9, 39 beam part 10, 40 free end part 11, 41 elastic tongue piece 12, 42 first 2 free end portion 13, 43 movable contact 14 N / O contact terminal 15, 17 contact portion 16 N / C contact terminal 18, 48, 78 common terminal 19 retainer 20 base 22 adhesive 53 drawing portion 79 coil spring 80 operation Board

Claims (2)

[Claims] 1. A push button switch comprising a housing in which a plunger is vertically movable and a base having a plurality of contact terminals and a common terminal fixed thereto, wherein a contact mechanism is disposed below the plunger. An elastic tongue having a second free end protruding from a free end of the movable contact and having a second free end pressed by the plunger; A push button switch characterized by being planted. 2. The push button switch according to claim 1, wherein a beam portion of said movable contact piece is formed in a saucer shape.