JPH04306521A - Push switch with U-shaped contact spring piece - Google Patents

Abstract

PURPOSE:To develop a push switch which is compact and can be manufactured at a low cost with excellent switching performance and duration for highly frequent use. CONSTITUTION:A fixed contact 8 is provided on the inside bottom surface of a case, the terminal 8' thereof stretches outside the case, and an insertion passing hole 10 for a presser is opened in a part of a ceiling plate. Inside a small cubic case B provided, on its left and right side plates with a recess part 11 formed for a fulcrum bearing a contact spring plate A and fulcrum shaft 4 are pivoted in the recess part 11, the presser 2 stretches outside through the insertion passing hole 10, a lower contact plate 7 is brought is pressure contact with the fixed contact 8 on one side, and also an upper contact plate 6 is positioned above the fixed contact on the other side to construct the switch.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention opens and closes contacts (turns ON and OFF a switch) by pressing and releasing a pusher.
The present invention relates to a push switch in which the following is performed. In addition, as one embodiment of the present invention, an extremely small switch (for example, 4 mm in length and 8 m in width) is installed inside an insulating case.
m, height 5 mm), and is characterized in that the contact spring piece is formed from a plate spring piece that has a simple structure and can be fabricated with extremely small precision machining.

0002

[Conventional Problems] In electronic devices related to FDs and DATs, push type switches open and close electric circuits by pressing and releasing a pusher, etc., and are extremely small (e.g., vertical,
If a switch exists that is inexpensive, has width and height dimensions of approximately 5 to 10 mm or less, and has excellent long-term, frequent use durability and switching performance, there would be a huge demand for it. However, conventional switches with excellent performance are expensive, and inexpensive switches have poor durability, and in any case, an excellent and inexpensive switch that meets the above dimensions has not been provided.

0003

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has developed a push switch that is extremely small, can be manufactured at low cost, and has excellent long-term, frequent use durability and switching performance.

That is, the present invention provides a pusher at the tip of the upper part of the horizontal U-shaped spring piece, and a fulcrum shaft near the curved part, and the lower part is divided into two parts and expanded vertically to form an upper contact point. A contact spring piece formed on the contact spring piece and the lower contact piece is pivoted about its fulcrum axis, and the lower contact piece is in contact with one fixed contact and the upper contact piece is positioned above the other fixed contact. The push switch solves the conventional problems.

[0005]

[Example] Next, an example of the present invention will be explained.
A pusher 2 is provided at the tip of the upper piece 1 of the shape spring piece, and a fulcrum shaft 4 is provided near the curved part 3, and the lower piece 5 is divided into two prongs and expanded vertically to form an upper contact piece 6 and a lower contact. The contact spring piece A formed on the piece 7 is pivoted about its fulcrum shaft 4, and the lower contact piece 7 is brought into contact with one of the fixed contacts 8, and the upper contact piece 6
is positioned above the other fixed contact 9 to provide a push switch.

[0006] A more specific embodiment of the structure will be described with reference to FIGS. 1, 2, and 3. Fixed contacts 8 and 9 are provided on the inside bottom of the case, and the terminals 8' and 9' protrude to the outside of the case. A contact spring piece A is placed in a case B such as a small cube, which has an insertion hole 10 for the pusher 2 in the part and a recess 11 for receiving the fulcrum shaft 4 on the left and right side plates, and the fulcrum shaft 4 is placed in the recess 11. The pusher 2 is pivoted to the outside through the insertion hole 10, the lower contact piece 7 is pressed against the fixed contact 8, and the upper contact piece 6 is placed above the fixed contact 9. This is a configuration of an invented push switch.

[0007]

[Operation] When the presser 2 of the contact spring piece A installed in the case B, which protrudes outward from the insertion hole 10 of the case B, is pressed down, the pressing force is applied to the upper piece 1 of the contact spring piece A in the direction of the lower piece 5. However, since the contact spring piece A of the present invention is pivotally supported in the recess 11 of the case B by the fulcrum shaft 4 near the base of the upper piece 1, the pressing force is compressed by the fulcrum shaft 4. With the center (fulcrum) at the tip of the lower piece 5 (i.e., the upper and lower contact pieces 6)
, 7) acts as a downward rotating force.

Therefore, the lower contact piece 7, which is already in pressure contact with the fixed contact 8, is bent, and the upper contact piece 6 is lowered and comes into pressure contact with the fixed contact 9, and the switch is turned on.

As mentioned above, since the pressing force acts to rotate the tip of the lower piece 5 downward about the fulcrum shaft 4,
The lower contact piece 7, which was already in pressure contact, and the upper contact piece 6, which was brought into pressure contact later, both slightly slide as if rubbing on the surfaces of the fixed contacts 8, 9 while being in pressure contact with the fixed contacts 8, 9.

When the pressure of the presser 2 is released, the upper and lower pieces 1 and 5 spring back to their original states, and at the same time, the lower contact piece 7 also springs back to its original state (while remaining in pressure contact with the fixed contact 8). The contact piece 6 separates from the fixed contact 9 and returns to its original position, and the switch 0
Becomes FF.

[0011]

[Effect] Simply bend the leaf spring pieces to create a presser, upper and lower contact pieces,
Since the switch is composed of a contact spring piece that only forms a fulcrum shaft, etc., and a plastic molded case that houses the contact spring piece, it has a simple structure and can be mass-produced at extremely low cost.

As described above, because of the simple structure and the use of contact spring pieces made of leaf spring pieces that can be manufactured in large quantities and automatically with small precision processing, it is possible to automatically mass produce extremely small and highly accurate switches. In addition, a push switch with extremely excellent long-term, high-frequency use durability and switching performance can be obtained.

Since the contact spring piece is pivoted around the fulcrum shaft, the pressing force applied to the presser acts as a downward rotational force on the tip of the lower piece (that is, the upper and lower contact pieces), thereby causing the lower contact piece to bend. The fixed contact pressure contact of the upper contact piece is performed accurately, and the tips of both contact pieces slide in pressure contact on the fixed contact surface, and this pressure contact slide exhibits a self-cleaning effect of the contact.
Uniform and highly accurate switching performance can be obtained over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of an embodiment of the push switch of the present invention.

FIG. 2 is a cross-sectional view along YY.

FIG. 3 is a Z-Z cross-sectional view.

[Explanation of symbols]

A Contact spring piece B Case 1 Upper piece 2 Presser ３　　　　Recurved part 4 Fulcrum shaft 5 Lower piece 6 Upper contact piece 7 Lower contact piece 8 Fixed contact 9 Fixed contact 8′ Terminal 9' terminal 10 Insertion hole 11 Recessed part

Claims (2)

[Claims] Claim 1: A presser is provided at the tip of the upper part of the horizontal U-shaped spring piece,
Further, a fulcrum shaft is provided near the recurved portion, and contact spring pieces formed by dividing the lower piece into two and expanding vertically to form an upper contact piece and a lower contact piece are pivoted about the fulcrum axis, A push switch in which the lower contact piece contacts one fixed contact and the upper contact piece is positioned above the other fixed contact. [Claim 2] A small cubic device with a fixed contact on the inside bottom of the case, the terminal protruding outside the case, a pusher insertion hole in a part of the top plate, and a recess for a fulcrum bearing in the left and right side plates. A contact spring piece is pivoted with its fulcrum shaft in a recess in a shaped case, a pusher is protruded to the outside from the insertion hole, and the lower contact piece is pressed against one fixed contact while the upper contact piece is pressed against the other fixed contact. 2. The push switch according to claim 1, wherein the push switch is arranged above a fixed contact.