JPH06231651A - Push switch - Google Patents

Abstract

PURPOSE:To obtain an excellent push switch which has a simple structure, and a high reliability having a contact stability, as to a push switch used to various electron apparatuses. CONSTITUTION:A holding terminal 15 and an individual terminal 16 are installed to a case 11, a U-shape movable armature 14 is held swayable on the holding terminal 15, and an operating body 12 pressure-welded to the movable armature 14 is provided, so as to compose this push switch, and a bending 14a is formed at the upper end of the movable armature 14. By such a constitution, a wiping function is generated to the contact through the bending 14a following the movement of the operating body 12, and thereby, foreign matters such as an oxide film and a dust are removed so as to stabilize the contact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push switch used in various electronic devices.

[0002]

2. Description of the Related Art A conventional push switch will be described below with reference to FIG. In FIG. 1, reference numeral 1 denotes a case made of synthetic resin, which has a support terminal 5 at the center of the bottom of the case 1, an individual terminal 6 with a contact 21 fixed on one side, and an upper part of the support terminal 5 A movable contact piece 4 having a contact 22 fixed to one side is swingably supported at an intermediate portion. The elastic metal plates 20 are supported on the upper ends of both ends of the movable contact piece 4.

Reference numeral 2 denotes an operating body made of synthetic resin, which has a heart cam groove 2a formed in the central upper surface and a convex portion 2b abutting against the metal plate 20 in the lower portion. 7 is
One end is arranged in the hole 1b formed in the case 1, and one end is a stopper arranged in the heart cam groove 2a of the operating body 2,
Reference numeral 8 is a return spring for urging the operating body 2 in the B direction.

The operation of the push switch configured as described above will be described below. First, the operating body 2
When pressing the button 2 in the direction of arrow A, the convex portion 2b of the operating body 2 moves while contacting the metal plate 20, and when the convex portion 2b passes over the support terminal 5, the movable contact piece 4 swings to contact the contact 21. The contact 22 is closed. Similarly, with the returning operation of the operating body 2,
The convex portion 2b of the operating body 2 moves in the B direction, and the contact 21 and the contact 22 are separated by the swing of the movable contact piece 4.

[0005]

However, in the above-described conventional configuration, when the push switch is stored or used, if an oxide film is formed on the surfaces of the contacts 21 or 22 or foreign matter such as dust adheres to the surface of the contacts 21, 22 There is a problem that a contact failure is likely to occur when the voltage / current is opened / closed. The present invention solves the above-mentioned conventional problems, and has an inexpensive and simple structure, which has excellent contact stability even when opening and closing a minute voltage / current, and opening / closing even under relatively large voltage and medium current conditions. It is an object of the present invention to provide a highly reliable switch which can be used in a wide load range from a very small current capable of having an ability to a large voltage medium current.

[0006]

In order to achieve this object, a push switch according to the present invention is provided with a support terminal and an individual terminal in a case, and is supported on the support terminal and has a movable contact which has a swingable elasticity. The movable contact piece is provided with a piece, and an operating body that is pressed against the movable contact piece and slidable in the case is arranged. The movable contact piece swings by moving the operating body in the sliding direction, and the end portion of the movable contact piece is moved. Is a structure that opens and closes in contact with and separates from the individual terminal, and the movable contact piece is formed in a U-shape, and a bending portion or a protruding portion is provided in the upper direction at the end portion on the operating body side.

[0007]

With this structure, after the plurality of leg pieces, which are one end portions of the U-shaped movable contact pieces, come into contact with the individual terminals in accordance with the movement of the operation body by the pressing operation, the curved portion or the protrusion provided at the other end portions. The protrusion formed on the lower portion of the operating body comes into contact with the portion, and the movable contact piece is pressed and moved in the moving direction of the operating body, so that wiping occurs at the contact portion of the movable contact piece, and an oxide film, dust, etc. The foreign matter is removed to ensure stable contact.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
Will be described.

In the figure, reference numeral 11 denotes a case made of synthetic resin. A support terminal 15 having a U-shaped upper portion is provided at the center of the bottom of the case 11, and an individual terminal 16 having a flat upper portion is provided on one side. I have it. 14 is a movable contact piece,
A first leg piece 14c formed in a U shape and provided with a curved portion 14a in an upward direction at an upper end portion thereof, and is divided into two on the individual terminal 16 side and a projection facing the individual terminal 16 is provided at each tip. Also, a second leg piece 14d is formed, and a notch 14b having a width h that satisfies t <h with respect to the thickness t of the support terminal 15 is formed at the bottom, and the notch 14b is locked to the support terminal 15. It is swingably supported. Furthermore, the length L1 of the first leg piece 14c from the support terminal 15 and the length L2 of the second leg piece 14d have a relationship of L1> L2. Further, reference numeral 12 is an operating body made of synthetic resin, and a heart cam groove 12a is formed on the central upper surface, and a convex portion 1 abutting the movable contact piece 14 is formed on the lower portion.
2b is formed.

Reference numeral 17 denotes a stopper having one end arranged in a hole 11b formed in the case 11 and one end arranged in the heart cam groove 12a of the operating body 12, and 18 a return spring for urging the operating body 12 in the B direction. And is fixed by a spring stop plate 19 at the tip of the operating body 12.

The operation of the push switch configured as described above will be described with reference to FIGS. First, as shown in FIG. 3, when the operating body 12 is pressed in the direction of arrow A against the force of the return coil spring 18 from the returning state of the operating body 12, the convex portion 12 b of the operating body 12 presses the movable contact piece 14. While moving, and when the convex portion 12b passes over the support terminal 15, the movable contact piece 14 swings, and the first leg piece 14c of the movable contact piece 14 first contacts the individual terminal 16 as shown in FIG. Then, as shown in FIG. 5, the second leg piece 14 of the movable contact piece 14 is
d contacts the individual terminal 16. When the operating body 12 is further pushed in the direction A, the convex portion 12b at the lower portion of the operating body 12 contacts the curved portion 14a at the upper end of the movable contact piece 14 as shown in FIG. 6, and pushes the operating body 12 to the full stroke. Accordingly, the movable contact piece 14 is moved in the operating direction of the operating body 12. At the same time, by the action of the stopper 17 and the heart cam groove 12a, the state is locked as shown in FIG.
When the operating body 12 is pressed again, the stopper 17 is unlocked, and when the pressing operation is stopped, the operating body 12 undergoes a process reverse to the above process due to the action of the coil spring 18 for returning, and then the process shown in FIGS. Returning to the state of FIG.

As described above, according to this embodiment, by providing the curved portion 14a at the upper end of the movable contact piece 14, after the two leg pieces 14c and 14d of the movable contact piece 14 contact the individual terminals 16, The curved portion 14 of the movable contact piece 14 along with the movement of the operating body 12
Since the individual terminals 16 are slid or wiped via the a, even if foreign matter such as an oxide film or dust is present in the contact portion, it can be removed and stable contact can be secured.

Since the first leg piece 14c is longer than the second leg piece 14d, the first leg piece 14c is replaced by the second leg piece 14d.
The individual terminal 15 is contacted earlier, and then the second leg piece 14d is contacted with the individual terminal 15. At the time of opening, the second leg piece 14d first separates from the individual terminal 15 and then the first leg piece 14c separates in the reverse process. Thus, since the arc generated when the switch is opened and closed is always generated in the first leg piece, the contact surfaces of the second leg piece and the individual terminals 16 facing the second leg piece are not damaged or consumed by the arc, and Since the wiping operation is performed, the contact state is always stable and the durability against the opening / closing load is also improved.

7 to 10 show the main parts of another embodiment of the movable contact piece. In FIG. 7, bent portions 14e and 14f are formed at the tips of the leg pieces 14c and 14d. Although the tip ends of the leg pieces 14c and 14d are flat in FIG. 8, the lengths of the leg pieces are different, and the same effect is obtained. Further, in FIG. 9, the length of each leg piece to the tip is substantially the same, but the bending length of the bent portion of the tip to the individual terminal 16 is different.
Further, in FIG. 10, the leg pieces have substantially the same length and the bent tip portions, but by providing the leg pieces 14c and 14d with an angle, the same effect as that of the above-described embodiment can be obtained. is there. It should be noted that, in any of the above-described embodiments, no lumpy contact is used for the contact portion of the movable contact piece 14 with the individual terminal 16. It goes without saying that it has an effect.

[0015]

As described above, according to the present invention, the movable contact piece is formed in a U shape, and the upward bending portion or the protruding portion is provided at the end portion on the operating body side. Is performed, and foreign matter such as oxide film and dust is removed even when opening and closing a minute voltage and current, and stable contact is secured.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a side sectional view for explaining the same operation.

FIG. 4 is a side sectional view for explaining the same operation.

FIG. 5 is a side sectional view for explaining the same operation.

FIG. 6 is a side sectional view for explaining the same operation.

FIG. 7 is a perspective view of a movable contact piece which is a main part of another embodiment.

FIG. 8 is a perspective view of a movable contact piece which is a main part of the other embodiment.

FIG. 9 is a perspective view of a movable contact piece which is a main part of the other embodiment.

FIG. 10 is a perspective view of a movable contact piece which is a main part of the other embodiment.

FIG. 11 is a side sectional view of a conventional push switch.

[Explanation of symbols]

 11 case 12 operation body 12b convex part 14 movable contact piece 14a curved part 14c first leg piece 14d second leg piece 15 support terminal 16 individual terminal

Claims (2)

[Claims] 1. A case in which a support terminal and an individual terminal are mounted, a U-shaped movable contact piece oscillatably supported on the support terminal, and a convex portion which press-contact slides on the movable contact piece. A push switch composed of an operating body and a curved portion or a protrusion provided in an upward direction at an end of the movable contact piece so that the movable contact piece slides on the individual terminal by the convex portion. 2. At least two leg pieces are formed on an end portion side of the movable contact piece which is slidably contacted on the individual terminal, and each contact portion of the leg piece with the individual terminal is formed with the individual terminal surface. A push switch with a gap between each contact part in the vertical direction.