JPS6033541Y2 - push button switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a push button switch, particularly a short stroke type push button switch.

2. Description of the Related Art Conventionally, there has been a structure as shown in FIG. 1 as a relatively small and lightweight short stroke type mechanical push button switch used in a keyboard or the like as an information input device.

In FIG. 1, a push-button switch 1 includes a key top 2 formed by molding an insulating material, a sheet-like elastic member 3 made of an elastic material such as rubber, a dish-shaped spring 4 made of a conductive thin plate, and a conductive plate spring 4 made of a conductive thin plate. The contact springs 5 and 6 are made of thin sheets with the necessary fixed contacts and lead terminals formed thereon, and a box-shaped casing 7 in which the contact springs 5 and 6 are insert-molded.

The disc-shaped spring 3 is housed in a casing 7 with an open top surface with its convex side facing up, and an elastic member 3 is stacked on top of the casing 7.

The peripheral wall 2a of the key top 2 is vertically fitted into the peripheral wall 7a of the housing 7, and the tip of the protrusion 2b hanging down from the center of the key top 2 is in contact with the center of the upper surface of the elastic member 3. .

Then, to prevent the key top 2 from falling off the housing 7,
Retaining means (not shown) are provided.

When the key top 2 of the push button switch 1 configured as described above is pressed, the protrusion 2b presses the disc spring 4 via the elastic member 3, as shown in FIG.
are inverted and connected to fixed contacts 5a and 6a formed on contact springs 5 and 6, respectively.

However, as shown by the solid line arrow in FIG. There were cases where the spring 4 was not pressed.

Further, in conventional switches, there was a problem in dustproofing the contacts, and it was difficult to obtain a long-life switch.

The present invention solves the above-mentioned conventional drawbacks, and its purpose is to provide a terminal board with an upwardly opening box-shaped terminal board made of an insulator with a plurality of fixed contacts at the bottom, and a conductive disc-shaped spring. A push-button switch that electrically opens and closes fixed contacts by reversing a disc-shaped spring housed therein, comprising: a closing plate having a through hole for pressing the disc-shaped spring; and a sheet accommodated on the disc-shaped spring. A push-button switch can be achieved by providing an elastic member having the shape of a shape, attaching the closing plate to the terminal plate so as to cover the upper opening, and pressing the elastic member against the disc-shaped spring.

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5.

FIG. 4 is a diagram showing a push button switch according to the present invention, in which A is a top view, B is a side view, C is a bottom view, and D is a side view of the other side, and FIG. Figure B is a side cross-sectional view of Figure B;

In the figure, 8 is a box-shaped terminal plate made of an insulator with a resin molded bottom, and as in the past, contact springs 5 and 6 having a plurality of fixed contacts 5a*6a are insert-molded at the bottom. There is.

Further, a protrusion 9 is integrally formed on the upper part of the outer side wall of the terminal plate 8, and a protrusion 10 for polarization and positioning and a plurality of standoffs 11 are integrally formed on the lower surface of the bottom part.

Reference numeral 12 represents a conductive disc-shaped spring, and reference numeral 13 represents a circular elastic member made of a rubber sheet.

Reference numeral 15 denotes a closing plate made of a metal plate, and has a through hole 16 for pressing a dish-shaped spring on its top surface and a hooking hole 17 on its side surface.

In this push-button switch, a disc-shaped spring 12 is housed in the circular interior of the terminal plate 8, and an elastic member 13 is placed on top of the spring 12. Next, the elastic member 13 is pressed to move the cover plate 15 to the terminal plate 8. It is assembled by disposing it in the upper opening and attaching the two by engaging the projection 9 and the hole 17.

The operation of the main push-button switch assembled in this way is such that when the elastic member 13 is pressed through the through hole 16 by the switch keying member 14 (see Fig. 5), the disk-shaped spring is reversed when the pressing force exceeds a certain level. The fixed contact 5a operates as shown in FIG.
and 6a are electrically connected by the disc spring 12.

When this pressing force is released, the disc spring 12 reverses itself again and returns to the state shown in FIG. 5, and the fixed contacts 5a and 6a are opened.

In the push button switch described above, since the closure plate is attached to the terminal plate by pressing the elastic member, the problem of backlash is absorbed by the elasticity, and a switch with good sealing performance can be obtained.

Further, since this switch is a push button without a key top directly attached to it, it does not have the drawbacks of the conventional switch as shown in FIG. 3, and is extremely easy to assemble.

Therefore, this push button switch has a long life and a high reliability of switch operation, and its effects are remarkable.

[Brief explanation of the drawing]

1 to 3 are diagrams for explaining a conventional push button switch, and FIGS. 4 and 5 are diagrams showing a push button switch according to the present invention. Explanation of symbols, 8...Terminal board, 12...
Belleville spring, 13...Elastic member, 15...
・Closure board.

Claims (1)

[Scope of utility model registration request] Equipped with an upward-opening box-shaped terminal plate made of an insulator with a plurality of fixed contacts at the bottom and a conductive disc-shaped spring.By reversing the disc-shaped spring housed in the waist terminal board, the connection between the fixed contacts is made. A push button switch for electrically opening and closing includes a closing plate having a through hole for pressing the disc-shaped spring, and a sheet-like elastic member accommodated on the disc-shaped spring, and the closing plate is made of metal having a U-shaped cross section. a plate and a protrusion on the outer wall thereof, and the closing plate and the terminal plate are connected by engagement of the hole and the protrusion,
A push button switch that is attached to the terminal plate while covering the upper opening, and that the elastic member is brought into pressure contact with the disc-shaped spring.