JP3074922B2 - 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, and more particularly to a flat push button switch mounted on a printed wiring board and used for a keyboard, an operation panel, and the like.

[0002]

2. Description of the Related Art A conventional example of this type is disclosed in Japanese Utility Model Application Laid-Open No. 2-57.
A device described in Japanese Patent No. 521 is known. 3 and 4 are a perspective view and a longitudinal sectional view of a switch body of the push button switch showing the above-mentioned conventional example. In the figure, reference numeral 1 denotes a switch main body. The switch main body 1 has an electrically insulating base 2 having a contact portion housing recess 3, a cover 4 covering the contact portion housing recess 3, and embedded in the base 2. Fixed electrodes 5 and 6, a circular movable electrode 7 made of a spring plate whose periphery is connected to the fixed electrode 5, a central shaft portion is in contact with the movable electrode 7, and a flange portion is pressed by the cover 4. And a circular operation member 10. 8
And 9 are terminals, the terminal 8 is connected to the fixed electrode 5, and the terminal 9 is connected to the fixed electrode 6. Cover 4 is base 2
It is fixed by caulking the head 1a of the pillar that is integral with the support. Reference numeral 11 denotes a stepped groove formed on each of two opposing side surfaces of the base 2, and a leg of a push button (not shown) is fitted into the stepped groove 11. In such a configuration, the operating member
When 10 is pressed against the spring force of the movable electrode 7, the fixed electrode 5,
6 is bridged by the movable electrode 7 and the terminals 8 and 9 are brought into conduction.

FIGS. 5 and 6 are a longitudinal sectional view of a push button switch showing a conventional example in which a push button 14 is mounted on the switch body 1 and an exploded perspective view of FIG. In the figure, 1
Is the switch body, 12 is a holder on the frame, 13 is a square dish-shaped leaf spring, 14 is a box-shaped case 15, a name plate 16 and a cap.
Reference numeral 17 denotes a push button, and reference numeral 18 denotes a light-emitting unit including a surface LED. The light-emitting portion 18 is housed inside a case 15, and the case 15 is slidably guided by a holder 12 mounted on the switch body 1, but between the case 15 and the operation member 10 of the switch body 1. Has a leaf spring 13 interposed therebetween. Also,
A name plate 16 and a cap 17 are attached to the upper opening of the case 15.

To assemble the illuminated push button switch, four cases 15a on the side wall of the case 15 are aligned with the guide grooves 12b, and the case 15 is inserted into the holder 12 from below. Then, the holder 12 is fitted to the outside of the switch body 1 on which the leaf spring 13 is placed on the operation member 10 by engaging the legs 12a of the holder 12 with the step grooves 11 on the side surfaces of the switch body 1. Then, terminal 18
The terminal 18a is pressed into the terminal hole 12c to fix the light emitting unit 18 to the holder 12 while the light emitting unit 18 is inserted into the case 15 in accordance with the escape groove 15b. Finally, the name plate 16 is placed on the case 15 while aligning the projection 15c with the groove 16a, and the cap 17
The cap 17 is fixed to the case 15 by engaging the projection 17a with the engaging portion 15d.

In such a configuration, when the push button 14 is pressed, the case 15 slides downward in the holder 12 while leaving the light emitting portion 18 at the fixed position, and causes the leaf spring 13 to bend.
When the leaf spring 13 bends to some extent and the spring force of the leaf spring 13 exceeds the spring force of the movable electrode 7 of the switch body 1, the operating member 10 is pushed down, and the switch body 1 closes. The leaf spring 13 is for extending the stroke of the illustrated push button switch, and the stroke is increased by the amount of the bending of the leaf spring 13.

[0006] In the operating member of the switch body,
There is an operation member in which an outer peripheral portion of the elastic member is fixed between a cover and a base as an elastic member made of rubber.

[0007]

A conventional push button switch in which a leaf spring is interposed between the push button and the operating member of the switch main body has a structure in which the operating member and the cover are moved by pressing the push button. A gap is formed in the switch body, and dust and dirt enter the switch body from the gap, and there is a defect that dust and dirt adhere to the contact surface and the like and cause a contact failure. Further, when the operating member of the switch body is made of an elastic material, the sliding contact friction between the elastic material and the tip of the leaf spring is large,
In addition, since the distal end of the leaf spring directly presses the soft elastic material, the distal end of the leaf spring bites into the elastic material, and there is a disadvantage that the operation member made of the elastic material is not smoothly operated.

In view of the above, it is an object of the present invention to secure a dust-proof structure in a switch main body in which a contact portion is housed, and to smoothly operate an operation member formed of an elastic material, and have a long life. It is to provide a push button switch.

[0009]

In order to solve the above-mentioned problems, a push button switch according to the present invention comprises an electrically insulating base having a recess for storing a contact portion, and a plurality of switches disposed in the recess for storing a contact portion. A fixed electrode, a movable electrode disposed in the contact portion storage recess so as to face the fixed electrode, a lower end abutting on the movable electrode, and an upper end protruding above a cover covering the contact portion storage recess opening. A push button switch including a switch body including an operation member, a push button slidably mounted on the switch body, and a leaf spring inserted between the push button and an operation member of the switch body. In the above, the operating member is formed of an elastic material, a concave portion is provided at an upper center projecting above the cover of the operating member, and an outer peripheral portion of the operating member is compression-fixed between the base and the base by the cover, Fitting the said plate tip in sliding contact synthetic resin cap of the spring in a recess of the serial operation member and said.

[0010]

In the above-described push button switch, a lower end is in contact with the movable electrode, an upper end is provided with a recess in the upper center projecting from the cover, and an outer periphery of the operating member formed of an elastic material having a cap fitted in the recess. Since the portion is compressed and fixed between the base and the cover by the cover, the operation member prevents dust and dirt from entering the switch body from the gap between the operation member and the cover. In addition, when the push button is pressed by fitting a synthetic resin cap into the recess of the operation member, the distal end of the leaf spring presses the operation member made of an elastic member via the cap. Slides smoothly.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a sectional view of a configuration of a push button switch and a longitudinal sectional view of a switch body according to an embodiment of the present invention. The same members as those of the conventional device of FIG. 5 are denoted by the same reference numerals, and the description thereof will be omitted.

In the figure, a difference from the conventional device is that an operating member 20 made of an elastic material has a lower end abutting on the movable electrode 7 and an upper end protruding above the cover 4 covering the contact portion housing recess 3. A recess 19 is provided at a point where the outer peripheral portion of the operating member 20 is compressed and fixed between the base 2 and the cover 2 by the cover 4, and a recess 19 is provided at the upper center of the operating member 20. The point is that a cap 21 made of a synthetic resin that is in contact is fitted.

The operating member 20 formed of the elastic material is fixed by compressing the outer peripheral portion between the operating member 20 and the base 2 by the cover 4 and caulking the head 1a of a column integrated with the base 2. Therefore, a dustproof structure for preventing dust and dirt from entering the switch body 1 through the gap between the operation member 20 and the cover 4 can be secured. Further, by fitting the synthetic resin cap 21 into the recess 19 of the operation member 20 formed of an elastic material, the tip of the leaf spring 13 presses the operation member 20 via the synthetic resin cap 21. Become like

In the configuration described above, when the push button 14 is pressed, the case 15 slides downward in the holder and
Flex 13 The tip of the leaf spring 13 is a synthetic resin cap fitted into the recess 19 of the operating member 20 made of elastic material.
When the leaf spring 13 is bent to some extent and the spring force of the leaf spring 13 exceeds the spring force of the movable electrode 7 of the switch body 1, the operating member 20 is pushed down,
The lower end of the operation member 20 pushes down the movable electrode 7 to close the switch body 1. At this time, the operating member 20 is made of a synthetic resin cap 21 fitted in the recess 19 of the operating member 20.
Therefore, the operation member 20 made of an elastic material can be smoothly operated. Also, the recess of the operating member 20
Since the cap 21 fitted in the sliding contact 19 comes into sliding contact with the tip of the leaf spring 13, the cap 21 reduces sliding friction with the tip of the leaf spring 13.

[0015]

According to the present invention, an operating member whose lower end abuts on the movable electrode and whose upper end protrudes above the cover covering the opening of the contact portion receiving recess is formed of an elastic material, and the outer peripheral portion of the operating member is formed. The cover is compressed and fixed between the base and the cover, so that the operation member can prevent dust and dirt from entering the switch body. Has the effect of preventing solder flux from entering the switch body.

Further, a concave portion is provided at the upper center projecting above the cover of the operating member, and a synthetic resin cap which is slidably contacted with the distal end portion of the leaf spring is fitted into the concave portion. The operating member made of elastic material is pressed through the cap through the cap, so that the operating member made of elastic material can be operated smoothly, and the sliding friction due to the tip of the leaf spring is reduced, so that the push button has a long life. The effect that a switch is obtained is obtained.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a switch body showing one embodiment of the present invention.

FIG. 3 is a perspective view of a switch body showing a conventional example.

FIG. 4 is a longitudinal sectional view of FIG. 3;

FIG. 5 is a longitudinal sectional view of a push button switch showing a conventional example.

FIG. 6 is an exploded perspective view of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switch body 2 Base 3 Contact part storage recess 4 Cover 5 Fixed electrode 6 Fixed electrode 7 Movable electrode 13 Leaf spring 14 Push button 19 Depression 20 Operation member 21 Cap

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 61-87421 (JP, U) Japanese Utility Model Hei 3-46926 (JP, U) Japanese Utility Model Sho 63-54217 (JP, U) Japanese Utility Model No. 4- 8225 (JP, U) Hikaru Hei 2-57521 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 13/06 H01H 13/52

Claims (1)

(57) [Claims] 1. An electrically insulating base having a contact portion storage recess, a plurality of fixed electrodes disposed in the contact portion storage recess,
A movable electrode disposed in the contact portion storage recess so as to face the fixed electrode; and an operating member having a lower end in contact with the movable electrode and an upper end protruding above a cover covering the contact portion storage recess opening. A push button switch comprising a switch body configured as described above, a push button slidably mounted on the switch body, and a leaf spring interposed between the push button and an operation member of the switch body. The member is formed of an elastic material, a recess is provided at the upper center of the operation member projecting upward from the cover, and the outer peripheral portion of the operation member is compression-fixed between the base and the base by the cover. A push button switch, wherein a cap made of a synthetic resin that is in sliding contact with the tip of the leaf spring is fitted into the recess.