JPS6222029Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a microswitch with improved voltage resistance structure between a common terminal and an actuator.

Conventionally, as shown in FIG. 4, in a micro switch, a movable contact piece support part 41 formed on the upper part of a common terminal 40 and an actuator 43 that drives a movable contact piece 42 via a push button (not shown) are used. An insulating partition wall portion 46 integrally formed with the case 45 is arranged between the base end hinge portion 44 and the base end hinge portion 44 .
The tip 47 of the partition wall 46 and the inner surface 4 of the cover 48
Therefore, the creepage distance between the movable contact piece support part 41 and the proximal hinge part 44 is the distance between the movable contact piece support part 41 and the proximal hinge part 44 on the inner surface 49 of the cover 48, which is closest to the proximal hinge part 41. Movable contact piece 42 from position g
up to the closest position h, and
The spatial distance is from the partition wall corner j to one side k of the movable contact piece 42. However, with this level of creepage distance and spatial distance, the movable contact piece support portion 41
The pressure resistance between the base end hinge portion 44 and the base hinge portion 44 may be insufficient, and the pressure resistance specifications may not be met.

Therefore, the object of this invention is to provide a microswitch that can increase the withstand voltage by increasing the creepage distance and space distance between the movable contact piece support part of the common terminal and the base end hinge part of the actuator. .

Hereinafter, embodiments of this invention will be described based on the drawings.

In FIG. 1, 10 is a case, and this case 10 includes a fixed terminal 12 having a normally closed contact 11.
A fixed terminal 14 having a normally open contact 13 and a common terminal 15 are provided. 16 is common terminal 1
5 is a movable contact piece support part protruding from the upper part of the contact piece;
A movable contact piece 17 rotatably engaged and supported by the support portion 16 and a front end spring receiving portion 1 of the common terminal 15.
The contact point 2 formed at the tip of the movable contact piece 17 by the spring force of the compression spring 19 interposed between the movable contact piece 17
0 is crimped to the normally closed contact 11. 21 is a push button provided on the case 10, and this push button 21
When the movable contact piece 17 is pushed down, the movable contact piece 17 is deflected downward, and when the deflection reaches a certain point, the biasing direction of the compression spring 19 against the movable contact piece tip 22 changes instantly, and the contact 20 of the movable contact piece 17 switches from normally closed contact 11 to normally open contact 13 in a snap-action manner. When the operating force on the push button 21 is released, the compression spring 19 returns to its original state based on the elastic return force of the movable contact piece 17, and the contacts 13 and 20 are opened and the contacts 11 and 20 are closed. .

Reference numeral 23 denotes an actuator having a lever configuration for pushing down the push button 21. As shown in FIG. 2, the proximal hinge portion 24 of the actuator 23 is connected to the case 10 and its cover by hinge pieces 25, 25 on both sides.
Hole 2 on both sides of recess 27 provided across 6
8 and 28 so as to be rotatable. In the recess 27, as shown in FIG. 3, a recess 29 is formed on the case 10 side and a protrusion 30 is formed on the cover 26 side. The partition wall portion 31 between the two is formed into a middle crack in the width direction. At the upper end of the movable contact piece support part 16, there is an arc-shaped notch 33 centered at the lower end c of the middle crack surface 32 of the partition wall part 31.
However, the proximal hinge portion 24 of the actuator 23
An arcuate notch 34 centered on the upper end b of the middle crack surface 32 is formed at the lower end of each.

In the above configuration, the movable contact piece 17 and the case inner surface 3
5 and the cover inner surface 36 is smaller than the distance f ₂ between the movable contact piece support part ₁₆ and the partition wall part 31, as in the conventional case. The creepage distance between the end hinge part 24 is from the notch end corresponding positions a, a of the partition wall part 31, through the middle crack surface 32, the partition root parts d, d, to the movable contact piece corresponding positions e and of the case inner surface 35. This is until the movable contact piece corresponding position e on the cover inner surface 36 is reached. Regarding the spatial distance, the notch 3
4 to each point on the contour of the other notch 33 via the middle crack surface 32.

Since the above-mentioned creepage distance and space distance are longer than the creepage distance and space distance obtained with the configuration shown in FIG.
The withstand voltage between 4 and 4 is enhanced compared to the conventional one. The reason why the notches 34 and 33 are formed in an arc shape centered on the upper end b and lower end c of the middle crack surface 32 is because the distance from each point on the outline of the notch 33 to each point on the outline of the notch 34 is This is to make all spatial distances equal.

As described above, according to this invention, the partition wall between the movable contact piece support part of the common terminal and the proximal hinge part of the actuator is formed into a split in the width direction, and the movable contact piece support part By forming a notch at the upper end and the lower end of the base hinge part, the creepage distance and space distance between the movable contact piece support part of the common terminal and the base end hinge part of the actuator can be set to be long, and the pressure resistance can be increased. A microswitch that can be enhanced is provided.

[Brief explanation of drawings]

Fig. 1 is an internal structure diagram of a micro switch according to an embodiment of this invention, Fig. 2 is an enlarged sectional view taken along line 2-2 in Fig. 1, Fig. 3 is a partially exploded perspective view, and Fig. 4 is a conventional microswitch. It is a partially cutaway explanatory diagram of an example. 15... Common terminal, 16... Movable contact piece support part, 23... Actuator, 24... Proximal hinge part, 31... Partition wall part, 32... Intermediate crack surface, 3
3, 34... Notch.

Claims (1)

[Claims for Utility Model Registration] (1) The partition wall between the movable contact piece support portion of the common terminal and the proximal end hinge portion of the actuator is formed into a split in the width direction, and the movable contact piece support portion is A microswitch comprising a notch formed at the upper end and at the lower end of the proximal hinge section. (2) The microswitch according to claim 1, wherein each notch is formed in an arc shape, and the center thereof is set on the middle crack surface of the partition wall.