JPS5829871Y2 - push button switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thin push button switch using a circular dome-shaped disc spring as a contact intervening conductor.

As this type of switch, the present applicant announced on October 2, 1978,
On the 8th, he proposed a push button switch shown in Japanese Patent Application No. 52-128643.

This push button switch will be explained with reference to a perspective view in FIG. 1 and an exploded perspective view in FIG.

In the figure, 1 is a terminal board, and terminals 3 and 3 are placed inside an insulator mold 2.
4 by insert molding.

The terminal 3 is formed by integrally connecting the terminal part 6 to the inner conductor 5,
The terminal 4 is formed by integrally connecting terminal portions 8, 9, and 10 to the outer conductor 7.

The inner conductor 5 is provided with three protruding contacts 11 which are made to protrude upward by a punch, and the outer conductor 7 is provided with three protruding contacts 11 which are made to protrude upward by an appropriate amount than the protruding contacts 11 by a punch.
protruding contacts 12 are provided.

The protrusion contact 11 and the protrusion contact 12 are each located on a concentric circle.

These terminals 3 and 4 are inserted into an insert mold by exposing the contact portion including the protruding contact 11 of the inner conductor 5 and the contact portion including the protruding contact 12 of the outer conductor 7 in a concave guide hole 2a provided in the mold 2. has been done.

Reference numeral 13 denotes a disc-shaped spring having a circular dome shape, and is inserted into the guide hole 2a of the mold 2 so as to be supported by the protruding contact 12 and projecting upward.

Reference numeral 14 denotes a sealing sheet, which has adhesive properties and is pasted on the upper surface of the mold 2 to prevent dust from adhering to the contact portions.

15 is an actuator that is displaced by operating the key top, and there are downward bending parts 16.1 on both sides of the base.
6' is provided, and the bent portion 16.16' is provided with a hole 17.
．． 17' is provided.

This actuator 15 is formed by punching and bending a leaf spring, and the mounting legs 18.18 are protruded from both sides of the mold 2 of the terminal plate 1 by utilizing the elasticity of the bent portions 16.16'.
It is fixed to the mold 2 by fitting the holes 17 and 17' into the holes 17 and 17'.

Next, the operation of the main push button switch 20 will be explained with reference to FIGS. 3 and 4.

Now, when the tip of the actuator 15 is pressed down by operating the key top 19 shown in FIG. Press as shown by the arrow.

Thereupon, the disc-shaped spring 13 is reversed as shown by the chain line in the figure and comes into contact with the protruding contact 11 of the inner conductor 5, and the terminal portion 6 and the terminal portion 8
, 9.10 is conductive.

Since this reversal of the disc-shaped spring 13 occurs instantaneously, the hand pressing down on the key top can clearly sense this moment, and can know that the switch has been activated.

When the pressing of the key top is stopped, the actuator 15 returns to its original position, the disc spring 13 is reversed to its original position, and the terminal portions are opened.

In this case, since each protruding contact 11, 12 protrudes from the conductor surface, the switch can operate reliably without being affected by dust or the like.

The key top 19 is fitted onto the top of a slider 22 which is biased by a spring 21, and the slider 22 is configured to move up and down within a guide 24 fixed to an operation panel 23.

Further, the push button switch 20 is mounted on a printed board 25.

By the way, in the conventional push button switch of the above-mentioned application, the sealing sheet 14 is only adhered to the upper surface of the periphery of the mold 2 because the mold 2 has the guide hole 2a.

For this reason, when the disc spring 13 is reversed, especially when the actuator 15 is released instantaneously, the disc spring 13 may jump up, push up the sealing sheet 14, and separate the adhesive. be.

Therefore, in the conventional method, there is a great danger that dust, water, etc. may enter the guide hole 2a, and highly reliable contact switching is difficult.

The present invention solves the above conventional drawbacks with a simple structure, and one embodiment will be described below with reference to FIGS. 5 to 8.

Note that in these figures, the same symbols as those described above represent the same contents.

FIG. 5 is a perspective view showing the main push button switch, which differs from the conventional switch shown in FIG. 1 in the structure of the actuator.

That is, the actuator 15' of the push button switch 20'
has retaining pieces 26 formed integrally by punching and bending on both sides.

FIG. 6 is a perspective view showing a push button switch according to another embodiment of the present invention, which differs from FIG. 5 in that the actuator 15' is fixed, whereas it is removable.

That is, the actuator 15' in the push button switch 20' shown in FIG. 6 has retaining pieces 26 integrally formed on both sides, and is provided with a hole 27 at the end.

The actuator 15' is mounted by inserting a protrusion formed integrally into the mold 2 into the hole 27 and then hot caulking the protrusion.

The main push button switch in Figures 5 and 6 is actuator 1.
It is characterized in that a retaining piece 26 is integrally provided at 5'.

As shown in the sectional view of FIG. 7, the actuator 15' has a retaining piece 26 which is attached to the sealing sheet 15 due to its spring property.
The upper surface of the periphery of the sealing sheet 14 is pressed against the mold 2 side to reinforce the adhesion of the sealing sheet 14.

Further, a part of the retaining piece 26 faces the disc-shaped spring 13, and functions to stop the disc-shaped spring 13 from jumping up.

Furthermore, the sealing sheet 14 for this switch is formed by pasting an anti-adhesive sheet 28 on the adhesive surface (sandy surface) of a single-sided adhesive tape, as shown in a perspective view in FIG.
is adhered to the mold 2 so as to cover the disc spring 13.

Therefore, the disc-shaped spring 13 is not adhered to the sealing sheet 14 but is rotatably housed within the guide hole 2a.

Therefore, since the Belleville spring 13 gradually rotates during its reversal operation, the contact position with the protruding contacts 11, 12 changes, and the life of the contacts can be extended.

As explained above, according to the present invention, the adhesion of the sealing sheet becomes strong, and it is possible to prevent the intrusion of dust, water, etc. as in the conventional method. The effect is great.

[Brief explanation of the drawing]

Figures 1 to 4 are diagrams for explaining the conventional push button switch of the previously applied application, Figure 5 is a perspective view showing the push button switch according to the present invention, and Figure 6 is a diagram showing another push button switch according to the present invention. The perspective view, FIGS. 7 and 8 are diagrams for explaining the push button switch of the present invention. Explanation of symbols 1...Terminal board, 2...Mold, 13...Disc spring, 14...
sealing sea), 15.15'...actuator,
20.20'...Push button switch, 26...
...Plate fixing piece.

Claims (2)

[Scope of utility model registration request] (1) In a push-button switch that opens and closes contacts by reversing a disc-shaped spring housed in a guide hole of a terminal board by vertical movement of an actuator, the actuator is integrally provided with a retaining piece for the disc-shaped spring; A push-button switch characterized in that the disc-shaped spring is retained in the guide hole of the terminal board by a sealing sheet, and the retaining piece prevents the disc-shaped spring from coming off through the sealing sheet. (2) The sealing sheet is formed by pasting an anti-adhesive sheet on the adhesive side of a single-sided adhesive tape, and the sealing sheet is adhered to the terminal board so that the anti-adhesive sheet covers the dish-shaped spring. A push button switch according to claim 1 of the utility model registration claim.