JPH04500Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a push button switch. In particular, the present invention relates to a push button switch which locks and releases the switch by engaging a lock pin in a heart-shaped cam groove and moving the lock pin along the cam groove when the push button is pressed down.

Conventionally, in this type of push button switch, as shown in Fig. 1, the configuration for pressing the lock pin was achieved by arranging the lock pin in the housing C, and then fixing the lid body (2) to which a pressing spring was attached to the housing (C). It had been.

However, in the above-mentioned conventional example, since the spring spring is sub-assembled to the lid and then attached to the housing, the assembly is relatively complicated and the number of manufacturing steps increases. In addition, since the fulcrum of the spring spring is on the lock pin side, the force that presses the lock pin is concentrated locally, which causes the pressing force to become unstable due to manufacturing variations in the spring spring, etc.
There were cases where the engagement of the lock pin with the cam groove became unstable.

In view of the above-mentioned circumstances, the present invention forms an insertion part for a lock pin and a torsion coil spring integrally in the housing,
The lock pin and torsion coil spring can be easily assembled by attaching them from the outside, and by locating the elastic fulcrum of the torsion coil spring away from the contact area between the lock pin and the torsion coil spring, the spring force can be reduced. To provide a push button switch that can obtain a stable pressing force.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a plan view of the push button switch of the present invention;
The figure is a front view of the same, FIG. 4 is a sectional view taken along the line A-A in FIG. 2, and FIG. 4 is an exploded perspective view of a main part.

In this invention, the push button switch PS has a fixed contact piece 7 on the lower side.
A box-shaped case 1 having a long rectangular shape and a base 6 having a shape, a slider 4 having a movable contact piece 5 and sliding inside the case 1 to switch contacts, and a slider 4 that encloses the case 1 and switches contacts. Bracket 8 fixed to fixed member 9
When the housing 1 is fixed to the fixing member 9 by the bracket 8, the knob 1 is attached to the knob attaching portion 41 of the slider 4 which penetrates through the through hole 9a of the slider 4 of the fixing member 9 via the attachment rod 11a.
2a, and a coil spring 10 interposed between the knob 12a and the fixing member 9.

Specifically, the housing 1 includes a main body portion 11 having a cross-sectional shape and a lower open end 12 of the main body portion 11.
It has a base 6 that closes the lower open end 12 by fitting a locking protrusion 6a into a locking hole 1d formed on the side. Further, the side wall 13 of the main body portion 11 is provided with a fitting groove 1c for the bracket 8, and the upper wall 1 is provided with a fitting groove 1c for the bracket 8.
The insertion portion 16 of the lock pin 2 is formed by erecting two side walls 15 facing each other across the long groove 1f.
and a vertical wall 1e connected to one end of each side wall 15 is provided, and a side wall recess 18 is bored in the upper wall of the side wall 15 to form an insertion portion 17 for the torsion coil spring 3. The insertion portion 17 of the torsion coil spring 3 and the insertion portion 16 of the lock pin 2 are connected. The upper side of the insertion hole 17 for the torsion coil spring 3 is an open torsion coil spring insertion hole 1g, and the locking protrusions 1b for the torsion coil spring 3 are formed in the recesses 18 that constitute the insertion portion 17 of the torsion coil spring 3, facing each other. has been done. Further, a locking hole 1a of the lock pin 2 on the housing 1 side is provided in front of the insertion portion 16 of the lock pin 2.

The slider 4 consists of a rectangular knob mounting part 41 and a cam forming part 42, and the knob mounting part 41 has a smaller rectangular shape than the cam forming part, and a guide groove 4c in which one end of the lock pin 2 is fitted upwardly. A heart-shaped cam 4a and a sliding groove 4b for slidingly guiding the other end of the lock pin 2 formed around the heart-shaped cam 4a are formed in the cam forming part 42, and a movable contact piece 5 is arranged below. A long groove 4d on which the fixed contact piece 7 slides is cut.

The bracket 8 has a substantially U-shape and is substantially enlarged at the open end side and forms a caulking claw 8a. The side portion of the bracket 8 has a width to fit into the fitting groove 1c of the housing 1.

The fixing member 9 has a through hole 9a through which the knob attachment portion 41 of the slider 4 passes, and a caulking pawl 8 of the bracket 8 that is bored across the through hole 9a.
A fitting hole 9b is formed.

The torsion coil spring 3 has a letter-shaped shape, and each open end thereof has a coil hole 3a and a bent portion 3b bent upward. The bent portion 3b comes into contact with the vertical wall 1e and serves as a fulcrum for applying the pressing force of the torsion coil spring 3 to the lock pin 2.

The structure of the present invention formed as described above is assembled as follows.

First, the ends 2a and 2b of the lock pin 2 are inserted into the locking hole 1a of the housing 1, and the other end 2b is inserted into the upper wall 14.
The slider 4 is projected into the housing 1 through the insertion portion 16 of the lock pin, and is fitted into the sliding groove 4b when the slider 4 is assembled to the housing. Next, insert the torsion coil spring 3 into the coil spring insertion part 16 through the insertion hole 1g.
With the connecting portion 3c in contact with the upper surface of the lock pin 2, the coil hole 3a is engaged with the locking protrusion 1b, and the lock pin 2 is biased.

Lower open end 12 of casing 1 assembled as described above
Then, the slider 4 is fitted so that one end 2a of the lock pin 2 is fitted into the guide groove 4c and the other end 2b is fitted into the sliding groove 4b. Next, the base 6 with the movable contact piece 5 fitted into the fixed contact piece 7 is attached to the open end 12 of the housing 1.
Then, the locking protrusion 6a is fitted into the locking hole 1d to be assembled. Therefore, the shape of the subassembly up to this point is such that the knob mounting portion 41 of the slider 4 protrudes from the housing 1. Next, the side part of the bracket 8 is fitted into the fitting groove 1c of the housing 1 of this subassembly, and in the fitted state, the knob mounting part 41 is passed through the through hole 9a of the fixing member 9, and the bracket 8 is inserted into the fitting groove 1c. The housing 1 is attached to the fixing member 9 by inserting the caulking claw 8a into the insertion hole 9b and caulking it. Then coil spring 1
0. A knob 12a is attached via an attachment rod 11a to constitute a push button switch.

Therefore, the lock pin insertion portion 1 is integrated with the housing 1.
6 and the torsion coil spring insertion portion 17, the lock pin 2 and the torsion coil spring 3 can be assembled sequentially from the outside, thereby greatly reducing the number of assembly steps. In addition, since the pressing force of the torsion coil spring 3 on the lock pin 2 forms a fulcrum at a position (vertical wall 1e) away from the pressing part,
Furthermore, even if the spring force of the torsion coil spring 3 is small, sufficient pressing force can be applied, so that the lock pin 2
A sliding groove 4b formed around the heart-shaped cam 4a of
The engagement is also stable.

As described above, the push button switch of the present invention includes a housing having a base having a fixed contact piece, a movable contact piece that contacts the fixed contact piece to switch the contact, and a slider that slides inside the housing. In a push-button switch consisting of a lock pin whose one end is locked to a housing and whose other end is engaged with a heart-shaped cam provided on a slider, both side walls shaped like the upper wall of the housing are opposed to each other across a long groove. a locking pin insertion portion formed in an upright manner, and a vertical wall connected to one end of each of the side walls, and a side wall recess whose upper portion is open in the upper wall of the both side walls. At the same time, locking protrusions of the torsion coil springs facing each other are formed in the insertion parts of the torsion coil springs, and one end of the torsion coil spring is locked to the locking protrusions. Since the other end is pressed against the lock pin and the lock pin is always pressed against the slider, the insertion portion of the lock pin and the insertion portion of the torsion coil spring are both located above the housing. Since both side walls and vertical walls are formed with openings at the top and are connected to each other, the torsion coil spring can be easily assembled without subassembling it into the housing as in the past. Pinch the legs on both sides, insert one end of the torsion coil spring from the insertion part of the torsion coil spring, make it contact the lock pin, and lock the other end with the lock protrusion. To provide a push button switch which can be assembled sequentially from the outside, is easy to assemble, and requires less man-hours for assembly.

It goes without saying that the present invention is not limited to the above embodiments.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing a conventional push button switch, Figs. 2 to 5 show the push button switch of the present invention, Fig. 2 is a plan view, Fig. 3 is a front view, and Fig. 4 is a
The figure is a sectional view taken along the line AA in FIG. 2, and FIG. 5 is an exploded perspective view of the main parts. 1... Housing, 16... Lock pin insertion part, 1
7... Insertion part of torsion coil spring, 3... Torsion coil spring, 3a... Coil hole part, 7... Fixed contact piece, 8... Bracket.

Claims (1)

[Scope of utility model registration request] a casing including a base having a fixed contact piece; a slider that slides within the casing and includes a movable contact piece that contacts the fixed contact piece to switch the contact; and a slider having one end locked to the casing and the other end. In a push button switch consisting of a lock pin engaged with a heart-shaped cam provided on a slider, the lock pin is formed by erecting both side walls of the upper wall of the housing so as to face each other across a long groove. and an insertion portion for a torsion coil spring formed by providing an upright wall connected to one end of each of the side walls and forming a side wall recess whose upper portion is open in the upper wall of the side wall. At the same time, locking protrusions of the torsion coil springs facing each other are formed in the insertion portions of the torsion coil springs, and one end of the torsion coil spring is locked to the locking protrusions, and the other end is pressed against the lock pin, so that the torsion coil springs are always in pressure contact with each other. A push button switch characterized in that the lock pin is pressed against the slider.