JP3366340B2 - Push switch with U-shaped contact spring piece - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention opens and closes a contact (switch ON and OFF) by pressing and releasing a pusher.
The present invention relates to a push switch that is configured to perform. Further, as one of the embodiments of the present invention, an extremely small switch (eg, vertical 4 mm, horizontal 8 m) having an insulating case interior is used.
m, height 5 mm), and for that purpose, the contact spring piece is formed by a leaf spring piece having a simple structure and capable of extremely small precision machining.

[0002]

2. Description of the Related Art In electronic equipment related to FD, DAT, etc., it is a push type switch, that is, a switch for opening and closing an electric circuit by pushing and releasing a pusher or the like, which is extremely small (eg,
(Vertical, horizontal, and height dimensions are each 5-10 mm or less)
If there is a switch that is inexpensive, inexpensive, and has excellent durability for high-frequency use for a long period of time and excellent switching performance, the demand for it is enormous. The expensive and cheap ones have inferior endurance performance, and in any case, no excellent inexpensive switch that meets the above dimensions has been provided.

[0003]

In order to solve the above problems, the present invention has developed a push switch which is extremely small in size, can be manufactured at low cost, and has excellent long-term high-frequency use durability and excellent switching performance.

That is, according to the present invention, a pusher is provided at the tip of the upper piece of the horizontal U-shaped spring piece, and a fulcrum shaft is provided in the vicinity of the inflection part. A contact spring piece formed on one of the lower contact piece and the lower contact piece is pivotally supported about its fulcrum shaft so that the lower contact piece contacts 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 described.
An upper piece 1 of the letter-shaped spring piece is provided with a pusher 2 at its tip, and a fulcrum shaft 4 is provided in the vicinity of the inflection part 3. The lower piece 5 is divided into two forks, and the upper piece is expanded vertically to form an upper contact piece 6 and a lower contact piece. The contact spring piece A formed on the piece 7 is pivotally supported about the fulcrum shaft 4, and the lower contact piece 7 contacts one fixed contact 8 and the upper contact piece 6
Is located above the other fixed contact 9 and a push switch is provided.

Referring to FIGS. 1, 2 and 3, a more specific embodiment will be described. Fixed contacts 8 and 9 are provided on the bottom surface of the inside of the case, and their terminals 8'and 9'protrude to the outside of the case. The contact spring piece A and the fulcrum shaft 4 of the contact point spring 4 are formed in the recess 11 in a case B of a small cubic shape or the like in which the insertion hole 10 of the presser 2 is opened and the left and right side plates are formed with the recesses 11 for receiving the fulcrum shaft 4. It is pivotally supported, the pusher 2 is projected from the insertion hole 10 to the outside, 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 to be installed. The invention constitutes a push switch.

[0007]

When the pressing element 2 of the contact spring piece A installed in the case B is pushed out from the insertion hole 10 of the case B, the pressing force is applied to the upper piece 1 of the contact spring piece A toward the lower piece 5. In the contact spring piece A of the present invention, since the vicinity of the base of the upper piece 1 is pivotally supported by the fulcrum shaft 4 in the concave portion 11 of the case B, the pressing force of the contact spring piece A of the present invention is increased. Acts as a force to rotate the tip of the lower piece 5 (that is, the upper and lower contact pieces 6 and 7) in the downward direction around the center (fulcrum).

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

As described 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 that has already been pressed and the upper contact piece 6 that has been pressed afterwards both slide slightly so as to rub the surfaces of the fixed contacts 8 and 9 while being pressed to the fixed contacts 8 and 9.

When the pressing force of the pressing element 2 is released, the upper and lower pieces 1 and 5 are elastically restored to the original state, and at the same time, the lower contact piece 7 is elastically restored (while being in pressure contact with the fixed contact 8). The contact piece 6 separates from the fixed contact 9 and rises and recovers, and the switch 0
It becomes FF.

[0011]

[Effect] Simply bending the leaf spring piece, pressing element, upper and lower contact pieces,
Since the switch is composed of a contact spring piece only having a fulcrum shaft and the like, and a plastic molded case for housing the contact spring piece, the switch has a simple structure and can be mass-produced at an extremely low cost.

Due to the simple structure as described above, and in particular, the use of the contact spring pieces made of leaf spring pieces capable of large-scale and automatic small-sized precision machining, the automatic mass-production of extremely small and highly accurate switches. It is also possible to obtain a push switch having extremely excellent long-term, high-frequency use durability and switching performance.

Since the contact spring piece is pivotally supported about the fulcrum shaft, the pressing force applied to the pusher acts as a downward rotation force of the tip of the lower piece (that is, the upper and lower contact pieces), so that the lower contact piece is not compressed. 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 exerts a self-cleaning effect on the contact, so that even contact over a long period of time is achieved. Accurate switching performance can be obtained.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along the line YY.

FIG. 3 is a sectional view taken along the line ZZ.

[Explanation of symbols]

A contact spring piece B case 1 Upper piece 2 Presser 3 Inflection part 4 fulcrum axis 5 Lower piece 6 Upper contact piece 7 Lower contact piece 8 fixed contacts 9 fixed contacts 8'terminal 9'terminal 10 insertion holes 11 recess

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01H 13/00-13/76 H01H 21/00 330 H01H 21/42

Claims (2)

(57) [Claims] 1. A pusher is provided at the tip of the upper piece of the horizontal U-shaped spring piece.
In addition, a fulcrum shaft is provided near the inflection part, the lower piece is divided into two forks, and the contact spring pieces formed by vertically expanding to form upper contact piece and lower contact piece are pivotally supported about the fulcrum axis. When the lower contact piece is in contact with one fixed contact and the upper contact piece is positioned above the other fixed contact, and when the pusher is pressed, the upper contact piece is pressed and the contact spring piece is centered on the fulcrum shaft. While rotating downward, the lower contact piece that is already in contact with one fixed contact of the lower piece is compressed and
Switch down by lowering the upper contact piece and making pressure contact with the other fixed contact.
When it is turned on and the pressing force of the pusher is released, the contact spring piece is restored upward about the fulcrum axis by elastic recovery of the upper piece and the lower piece equipped with the pusher, and the lower contact piece of the lower piece is A push switch is provided so that the fixed contact can be elastically restored while being pressed, and the upper contact piece can be lifted and restored from the other fixed contact to switch off. 2. A small cubic in which a fixed contact is provided on the inner bottom surface of the case, its terminal is projected to the outside of the case, an insertion hole for a pressing element is formed in a part of the top plate, and a recess for a fulcrum bearing is formed on the left and right side plates. In the case of the shape, etc., the fulcrum shaft of the contact spring piece is pivotally supported in the recess, the pusher is projected to the outside from the insertion hole, the lower contact piece is pressed against one fixed contact, and the upper contact piece is connected to the other. It is installed so that it is positioned above the fixed contact, and when the pusher protruding outside from the insertion hole is pressed down, the upper contact piece is pressed down and the contact spring piece rotates downward around the fulcrum shaft. When the lower contact piece that is already in contact with one fixed contact of the lower piece is pressed and the upper contact piece is lowered and pressed into the other fixed contact to turn on the switch and release the pressure of the presser. , Contact point by elastic recovery of upper and lower pieces equipped with pusher The spring piece restores around the fulcrum axis and rotates upward, the pusher rises and restores, the lower contact piece of the lower piece elastically restores while being in pressure contact with one fixed contact, and the upper contact piece from the other fixed contact. The push switch according to claim 1, wherein the push switch is provided so as to be lifted up and restored away from the switch and turned off.