JPS605474Y2 - push switch - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bushing switch suitable for use as a switch for operating electronic equipment such as a television.

The object of this invention is to provide a bushing switch with a simple configuration and improved contact reliability.

Examples of this invention will be explained below according to the drawings.1.
2 is a flat first plate made of brass or a highly conductive metal.
, a second lead frame with holes 3 and 4 in its center.
5. A pair of terminal pieces 5, which are bent and extended downward from the ends of the opposite side edges. 6. 6.

Reference numeral 7 denotes a first spring plate made of a metal plate, which has a dome portion 8 at its center that projects upward and has approximately the same diameter as the hole 3 of the lead frame 1, and has a flat surface on the periphery of the dome portion 8. It has part 9.

Reference numeral 10 denotes an insulating spacer made of thermoplastic resin such as nylon that melts when heated at a relatively low temperature, and has a hole 11 in the center having approximately the same diameter as the dome portion 8 of the spring plate 7.

Reference numeral 12 designates a second metallic spring plate having a noble metal stripe plating 13 applied to the central upper surface.

The above components are assembled as follows.

First, insert the first spring plate 7 into the hole 3 of the first lead frame 1.
The lead frame 1 and the spring plate 7 are joined by fitting the dome portion 8 of the lead frame 1 and the spring plate 7, and in this state, the joint portion of the lead frame 1 and the spring plate 7 is spot welded to connect the lead frame 1, the spring plate 7, and the laminate. Connect mechanically and mechanically.

On the other hand, for the second lead frame 2 and the second spring plate 12, the lower surface of the spring plate 12 and the upper surface of the lead frame 2 are joined together in the same manner as above, and the two are electrically and mechanically connected by spot welding. .

Next, the lower surface of the first spring plate 7 and the second spring plate 12 are
After laminating the first and second lead frames 1 and 2, the first and second spring plates 7 and 12, and the insulating spacer 10 by joining the upper surfaces to the upper and lower surfaces of the insulating spacer 10, these laminated parts are made of plywood. By holding it above and applying a heater press, the insulating spacer 10 melts and the first and second spring plates 7.12 are bonded together, thereby integrating the laminated parts.

The bush switch assembled as described above includes the first,
Since the second spring plates 7 and 12 are closely attached to each other via the insulating spacer 10, the electrical contact portions of the first and second spring plates 7 and 12 are sealed and have a drip-proof and dust-proof function.

In addition, in the above-mentioned bush switch, by pressing the dome portion of the spring plate 7, the spring plate 7 flips downward with a snap action and comes into contact with the plated portion 13 of the second spring plate 12. When the spring plate 12 is bent downward, good contact can be obtained.

In the bush switch of the above embodiment, the insulating spacer is made of a thermoplastic resin such as nylon that melts when heated at a relatively low temperature, but a resin insulating sheet coated with adhesive on both sides may also be used.

FIG. 3 shows an example of a pushbutton switch constructed using the above-mentioned bushing switch.
and case 30.

That is, the push button 20 has an operating portion 21 on its upper surface, and has engaging pieces 22 extending downward on each side edge.

A locking protrusion 23 is formed at the tip of this engaging piece 22 .

The bushing switch A has a locking projection 14 on each terminal piece 5, 5, 6, 6, respectively.

The case 30 is formed in a box shape, and the terminal piece 5 of the switch A is placed in the recess 31. 5. 6. It has four holes 32 into which the locking pieces 6 are fitted, and a hole 33 through which the locking piece 22 passes.

Therefore, the pushbutton switch has four holes 32 in the case 30 with each terminal piece 5, 5, 6 of the pushbutton switch A.
6 and each locking protrusion 1 of this terminal piece 5, 5゜6.6
4 to the case, and then the engagement piece 22 of the push button 20
can be easily assembled by inserting into the hole 33 of the case 30 and engaging the locking protrusion 23 of the engagement piece 22 with the periphery of the hole 30 of the case 30.

As is clear from the above description, this invention includes first and second lead frames having a hole in the center and a terminal piece extending downward on one side, and a first spring having a dome portion in the center. a plate, an insulating spacer having a hole in the center corresponding to the dome portion of the first spring plate, and a flat second spring plate, and the first spring plate is attached to the bottom surface of the first lead frame.
At the same time, the second spring plate is welded and fixed to the upper surface of the second lead frame, and the flat lower surface of the first spring plate and the second spring plate are welded to each other. The upper surface of the first spring plate is adhered to the upper and lower surfaces of the insulating spacer to form a bushing switch. Therefore, the electrical contact portions are both made of spring plates, and the dome portion of the first spring plate is attached to the upper surface of the first spring plate. When making contact with the second spring plate, the second spring plate can bend toward the direction provided on the second lead frame, thereby improving contact reliability.

Furthermore, with an extremely simple configuration in which the first and second spring plates are bonded together via an insulating spacer, the electrical contact portion can be sealed, improving environmental resistance, and making the contact more reliable and stable. There is also.

Furthermore, since it can be made into a very thin bushing switch, it has the advantage of being suitable for use in built-in switches such as push button switches.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the bushing switch of this invention, Fig. 2 is a central sectional view of the bushing switch, and Fig. 3 is an exploded perspective view showing a pushbutton switch using the bushing switch. FIG. 1...First lead frame, 2...
Second lead frame, 3, 4... Holes, 5, 6
...Terminal piece, 7...First spring piece, 8
...Dome part, 9...Flat part, 10.
...Insulating spacer, 11 ... Hole, 12.
...Second spring plate.

Claims (4)

[Scope of utility model registration request] (1) First and second lead frames having a hole in the center and a terminal piece extending downward on one side, a first spring plate having a dome in the center, and the first spring plate in the center. an insulating spacer having a hole corresponding to the dome portion of the lead frame, and a flat second spring plate, the flat part of the first spring plate being welded and fixed to the lower surface of the first lead frame; , the second spring plate is welded and fixed to the upper surface of the second lead frame, and the flat lower surface of the first spring plate and the upper surface of the second spring plate are connected to the upper and lower surfaces of the insulating spacer. A butshu switch characterized by being configured by adhering to. (2) The bushing switch according to claim 1, wherein the insulating spacer is made of a heat-sensitive adhesive sheet made of thermoplastic resin. (3) The bushing switch according to claim 1, wherein the insulating spacer is made of a resin insulating sheet coated with adhesive on both sides. (4) The bushing switch according to claim 1, which is a registered utility model, characterized in that the upper center surface of the second wing plate is plated with a precious metal stripe.