JPH0631037U - Push switch - Google Patents

Abstract

(57) [Summary] [Purpose] To extend the life of push switches. [Structure] When the knob 10 is pushed down against the return spring 8, the upper ends of the fixed contacts 7 come into contact with the outer peripheral surfaces of the winding parts at both ends of the coil spring 13 as a movable contact, and the switch is closed (ON). It becomes a state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a push switch incorporated in various electronic devices.

[0002]

[Prior art]

 Conventionally, push switches have been used in many electronic devices and the like, and a general structure of the push switch is disclosed in JP-A-63-285830. A movable contact consisting of a torsion spring is provided inside, and by operating the knob, the locking part of the movable contact is pushed down to make contact with the fixed contact.

[0003]

[Problems to be solved by the device]

 In the conventional push switch described above, since the contact point between the fixed contact and the movable contact is always a fixed point, the contact is worn out and a contact failure occurs, or the contact is easily clogged.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, in the push switch according to the present invention, the movable contact that comes into contact with the fixed contact by operating the knob is composed of a coil spring, and the outer peripheral surface of the winding portion of the coil spring can come into contact with the fixed contact. The knob was inserted with play in the recess or hole formed in the knob.

[0005]

[Action]

 When the knob is pressed against the return spring, the coil spring as a movable contact moves downward together with the knob, and the outer circumferential surface of the coil spring contacts the tip of the fixed contact to turn on the switch. .

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is an overall perspective view of a push switch according to the present invention, FIG. 2 is an exploded perspective view of the push switch, and FIGS. 3 and 4 are sectional views showing the operation of the push switch.

The push switch comprises a case 1 composed of an upper half body 2 and a lower half body 3. The upper half body 2 is provided with a guide cylinder 2b on the upper surface of a square cylinder 2a whose lower side is opened, and the square cylinder 2a A locking hole 5 is formed on the outer surface so that a locking piece 4 with another member and a locking piece 6 provided on the lower half 3 can be engaged. A pair of fixed contacts 7, 7 is attached to the lower half body 3 so as to penetrate therethrough, and a convex portion 9 into which a return spring 8 is fitted is provided between the fixed contacts 7, 7.

A knob 10 is inserted into the guide tube 2b of the upper half body 2 from below. The knob 10 is composed of a shaft portion 10a and a flange portion 10b provided at a lower end of the shaft portion 10a. A locking portion 11 for engaging with another member is formed at an upper end of the shaft portion 10a, and a lower portion is provided at the flange portion 10b. A concave portion 12 that opens to the side is formed laterally. Both ends of this recess 12 are tapered surfaces as shown in FIGS. 3 and 4, and a coil spring 13 as a movable contact is inserted therein with play.

In the above, to assemble the push switch, the knob 10 is inserted into the guide tube 2b, the coil spring 13 is inserted into the recess 12 of the knob 10, and the return spring 8 is fitted into the projection 9 of the lower half 3. Then, in this state, the two halves 2 and 3 are assembled so that the engaging portion 6 of the lower half 3 is fitted into the engaging hole 5 of the upper half 2.

Then, as shown in FIG. 3, the knob 10 is lifted by the return spring 8 until the upper end of the flange portion 10 b contacts the inner surface of the case, and the coil spring 13 is prevented from falling from the recess 12 by the return spring 8. Then, the fixed contact 7 and the coil spring 13, which is the movable contact, are brought into non-contact with each other, that is, the switch is opened (OFF).

On the other hand, when the knob 10 is pushed down against the return spring 8 as shown in FIG. 4, the upper ends of the fixed contacts 7 come into contact with the outer circumferential surfaces of the coil spring 13 at both ends, and the fixed contact 7 is closed. It is in the ON state. At this time, since both ends of the coil spring 13 are bent upward along the tapered surface of the recess 12, the impact at the time of contact is mitigated.

As described above, the switch is repeatedly turned on and off by moving the knob 10 up and down, but the coil spring 13 moves in the recess 12 as the knob 10 moves up and down. As a result, the contact point of the coil spring 13 with the fixed contact 7 is constantly changing, and only a part is not worn.

Although the recess 12 is formed in the knob 10 in the embodiment, a hole may be formed instead of the recess 12 and the coil spring 13 may be inserted into this hole. In short, the coil spring 13 may be held by the knob 10 with some play.

[0014]

[Effect of device]

 As described above, according to the present invention, the movable contact of the push switch is formed by the coil spring, and the outer peripheral surface of the winding portion of the coil spring is formed into the concave portion or the knob formed so as to be able to contact the fixed contact. Since it is inserted with play in the hole, the contact part of the movable contact with the fixed contact changes gradually each time the switch is operated, and the contact does not always occur at the same place. As a result, the life of the switch is greatly extended without causing contact failure due to abrasion of only a part of the movable contact. In addition, since the movable contact moves within the concave portion (hole) of the knob each time the switch is operated, it also has the effect of self-cleaning the dust adhering to the movable contact.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a push switch according to the present invention.

FIG. 2 is an exploded perspective view of the push switch.

FIG. 3 is a sectional view showing the operation of the push switch.

FIG. 4 is a sectional view showing the operation of the push switch.

[Explanation of symbols]

1 ... Case, 7 ... Fixed contact, 8 ... Return spring,
10 ... Knob, 12 ... Recessed portion, 13 ... Coil spring which is a movable contact.

Claims (1)

[Scope of utility model registration request] 1. In a push switch in which a movable contact is brought into contact with and separated from a fixed contact mounted on a case, the movable contact is composed of a coil spring, and the coil spring is wound. A push switch characterized by being inserted with play into a recess or hole formed in the knob so that the outer peripheral surface of the part can contact the fixed contact.