JPH07109738B2 - Push switch - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push switch used for car radios, car stereos and the like.

2. Description of the Related Art A conventional push switch will be described with reference to FIGS. 4, 5, and 6 (a) to (f).

FIG. 4 is an exploded perspective view of a conventional push switch, FIG. 5 is a sectional view of the push switch, and FIGS. 6 (a) to 6 (f).
[Fig. 3] is an operation principle diagram of the push switch.

In FIGS. 4 and 5, reference numeral 1 is a synthetic resin box-shaped first
In this case, fixed contacts 4 and 5, which are electrically connected to the external connection terminals 2 and 3, are held inside.

The reference numeral 11 designates a synthetic resin rotating body, which is provided with cam portions 13 and 14 on both sides of a central ratchet portion 12 and further has a first portion on both sides thereof.
Supporting portions 15 and 16 that are rotatably held at a constant center by the groove portions 6 and 7 of the case 1 and the second case 21 are provided.

Inside the box-shaped second case 21 made of synthetic resin, movable contacts 24 and 25, which are electrically connected to the external connection terminals 22 and 23 and are in elastic contact with the fixed contacts 4 and 5, are held.

Reference numeral 31 denotes a driving body made of synthetic resin having a square cross section, and provided with guide portions 32 and 33 which are fitted into the groove portions 26 and 27 of the case 21, respectively, so as to be linearly movable. It has two elastic claw parts, a feed claw 35 which engages with the ratchet part 12 from above and a return claw 36 which engages from below.

Reference numeral 41 denotes a cone-shaped coil spring which is in contact with the spring receiving portion 8 of the first case 1 and the spring receiving portion 37 of the driving body 31 and exerts stress in the direction of returning the driving body 31 with respect to the pushing operation of the driving body 31. .

Next, the operation of this switch will be described with reference to FIG. 6 in terms of circuit opening operation and circuit closing operation.

The operation of the circuit will be described for the previous circuit, and the same applies to the other circuit.

(1) Opening operation of the circuit When the shaft 51 is pushed in the direction of the arrow in FIG.
The driving body 31 which is in contact with is also moved in the same direction, and when it reaches the position shown in (b), the feed claw 35 of the driving body 31 pushes the mountain 61 of the ratchet portion 12 of the rotating body 11 and the rotating body 11 is supported. Rotate counterclockwise around parts 15 and 16. Keep pressing, (c)
When the position shown in Fig.
36 rides over the mountain 62 of the ratchet portion 12 of the rotating body 11 to generate mechanical moderation. At this time, the crest portion 63 of the cam portion 13 rotating at the same time as the ratchet portion 12 of the rotating body 11 pushes up the bending portion 29 provided on the movable contact 24 to push the fixed contact 4 into contact with the movable contact 24. The dowel part 52 is separated, and the circuit is opened.

When the operation of returning the shaft 51 is performed, the driving body 31 returns due to the action of the spring 41, and the return claw 36 pushes the mountain 64 of the ratchet portion 12 of the rotating body 11.

When the driving body 31 is returned to the position of (d), the feeding claw 35 of the driving body 31 having elasticity has the peak 65 of the ratchet portion 12 of the rotating body 11.
And a mechanical return mode is generated, and the opening operation of the circuit is completed. (E) (2) Circuit closing operation When the shaft 51 is pushed again from the state of (e), the rotating body is the same as above.
When 11 rotates counterclockwise and reaches the position of (f), the return claw 36 of the driving body 31 having elasticity as described above is rotated by the rotating body.
It overcomes the mountain 66 of the ratchet part 12 of 11 and generates a mechanical moderation. At this time, the bent portion of the movable contact 24 is formed in the valley portion 67 of the cam portion 13 that is rotating at the same time as the ratchet portion 12 of the rotating body 11.
29 enters, the dowel part 52 of the movable contact 24 elastically contacts the fixed contact 4, and the circuit is closed.

Similar to the above-mentioned opening operation, by returning the shaft 51, a mechanical return detent is generated and the circuit closing operation is completed (a).

The above-described (1) circuit opening operation and (2) circuit closing operation are repeated each time the shaft is pushed, and the switch opening / closing operation is established.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, the overall length of the push switch having such a configuration is determined by the rotating body 11, the feed claw 35, the return claw 36, and the spring receiving portion 37, and the length of the driving body 31 and the spring. It is determined by the compression height of 41, the thickness of the spring receiving portion 8 of the first case 1, and the drive stroke. Therefore, when shortening the overall length, it is conceivable to hold down these components to the minimum.However, there are limits to their respective dimensions, and they can be made more compact (thin type without changing the drive stroke and circuit switching position). There was a problem in changing.

In view of the above problems, the present invention provides a push switch having a shorter overall length than conventional push switches.

Means for Solving the Problems In order to solve the above problems, the present invention is directed to a box-shaped first case made of synthetic resin, which holds a fixed contact and a terminal for external connection thereof, and a movable member which makes elastic contact with the fixed contact. A synthetic resin second case that holds the contacts and their external connection terminals, and a synthetic resin that includes a ratchet portion and a cam portion that are rotatably supported in the housing in which the first and second cases are engaged. A composite having a rotary body integrally formed with a feed claw (or a return claw) that is capable of linear reciprocating movement and that engages with the ratchet portion of the rotary body from above and a return claw (or feed claw) that engages from below. A resin-made driving body, both ends of which are held by the first case, a central character-shaped portion abuts against the driving body, and a coil-shaped spring between the central character-shaped portion and the fixing portions at both ends drives the driving material. In the direction to return the driver to the pushing operation of It is obtained constituted by a torsion coil spring force acts.

The spring of the conventional push switch is located on the same axis as the operating shaft, whereas the present invention is located on both sides of the driver at the front of the movable contact as described above. The compression height of the spring and the length of the spring receiving portion of the driving body can be eliminated, and the overall length can be greatly shortened.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3 (a) to (f). The same parts as those of the conventional technique are designated by the same reference numerals and the description thereof will be omitted.

In FIGS. 1 and 2, the driving body 71 has guide portions 72, 73, 74 which are fitted in groove portions 82, 83, 84 provided in the second case 81 so as to be linearly movable. A return claw 76 having a shape for hooking and rotating the ratchet portion 12 of the rotating body 11 when the drive body 71 returns in the same direction as the feed claw 35 is provided.

The return claw 76 has a hooking surface 75 at the same position as the length from the conventional front portion to the tip of the return claw 36.

Further, the case 91 is provided with spring holding holes 92, 93 and coil abutting portions 94, 95 for abutting the spring coil portions 104, 105.

101 is a spring holding hole of the first case 91 with both ends 102 and 103
A twisted coil spring in which the rear part of the coil parts 104, 105 abuts the coil abutting parts 94, 95 of the case 91 and the front part of the center-shaped part 106 abuts the spring receiving part 77 of the driving body 71. The coil is on both sides of the upper part of the U-shape, and has a shape extending horizontally from the coil.

Since the operation of this switch does not change the movements of the rotating body 11 and the movable contact 24, only the circuit opening operation will be described with reference to FIG. Only the illustrated operation (f) is performed for the closing operation.

When the shaft 51 is pushed in the direction of the arrow in FIG.
The driving body 71, which is in contact with the
The center-shaped portion 106 of 101 also moves in the same direction and is twisted, and the opening angle of the coil becomes smaller, and stress is generated in the returning direction.
When the position shown in (b) is reached, the feed claw 35 of the driving body 71 pushes the mountain 61 of the ratchet portion 12 of the rotating body 11, and the rotating body 11 rotates counterclockwise about the supporting portions 15 and 16. It should be noted that the drive body 71 having elasticity is kept pressed until it reaches the position shown in (c).
The hooking surface 75 of the return claw 76 is the ratchet part of the rotating body 11.
Overcome 12 mountains 62 and generate mechanical moderation. At this time, the mountain portion 63 of the cam portion 13 rotating at the same time as the ratchet portion 12 of the rotating body 11 pushes up the bending portion 29 provided on the movable contact, and the dowel portion of the movable contact 24 elastically contacting the fixed contact.
52 is released and the circuit is opened.

When the operation of returning the shaft 51 is performed, the driving body 71 is returned by the action of the spring 101, and the hook surface 75 of the return claw is rotated.
Hit the mountain 64 of the ratchet part 12 of 11,
Turn the rotating body 11 counterclockwise.

When the driving body 71 is returned to the position of (d), the feeding claw 35 of the driving body 71 having elasticity has the peak 65 of the ratchet portion 12 of the rotating body 11.
And a mechanical return mode is generated, and the opening operation of the circuit is completed. (E) Effect of the Invention As described above, the push switch according to the present invention can be made smaller (thinner).

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a push switch according to an embodiment of the present invention, and FIG. 2 is a partial sectional side view of the push switch.
3 (a) to 3 (f) are views showing the opening / closing operation of the push switch, FIG. 4 is an exploded perspective view of a conventional push switch, and FIG. 5 is a partial sectional side view of the push switch. (A)-(f) is a figure which shows the opening / closing operation of the push switch. 71: driver, 81: second case, 91: first case, 106: torsion coil spring.

Claims (2)

[Claims] 1. A box-shaped synthetic resin case holding a fixed contact and an external connection terminal thereof, and a synthetic resin holding a movable contact elastically contacting the fixed contact and an external connection terminal thereof. Linear reciprocating movement is possible with a second case, a rotating body that is rotatably supported in the housing in which the first and second cases are engaged, and a ratchet part and a cam part are integrally formed of synthetic resin. And a driving member made of a synthetic resin having a feed claw (or a return claw) engaged with the ratchet part of the rotating body from the upper part and a return claw (or a feed claw) engaged with the lower part, and the feed claw (or the return claw). ), Spring coil portions are arranged on both sides, respectively, and are brought into contact with the first case, both ends are held by the first case, and a central U-shaped portion is brought into contact with the driving body. And fixed parts on both ends The push switch configured by a torsion coil spring which stress acts in a direction to return the driver to press the operation of the driver by a spring of the spring coil portion between. 2. The push switch according to claim 1, wherein the two claw portions of the driving body are vertically extended from the same direction so that the cross-sectional shape is U-shaped.