JPH036607B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A reversing spring type lease switch, that is, a conventional switch of this type has a fixed contact piece 3 buried in an insulating base 1, and an elastic movable spring piece 2 buried in parallel. Then, the tip of the movable spring piece 2 and the fixed contact piece 3
A semicircular arc spring 5 is stretched between the pusher 4 at the tip, and when the pusher 4 is pressed from one direction, the movable spring piece 2 is bent and at the same time the semicircular arc spring 5 is compressed inward. However, when it exceeds one point (dead center) during the pushing process, the movable spring piece 2 momentarily reverses in the opposite direction and comes into pressure contact with the contact point 6 on the opposite side, and when the pushing force is released, it forms a semicircle. The elastic force of the arc spring 5 causes the leaf switch to be reversed again and restored to its original state (Fig. 4).The present invention relates to a leaf switch that operates in the same manner as described above but has a new configuration, and is different from the conventional half-leaf switch. Instead of the arc-shaped spring 5, a coil spring is used, which requires a smaller switching stroke than the spring piece 5, and substantially the entire fixed contact piece and movable spring piece are covered with a cover. It is pivoted to a part of the insulating base of the switch so that it can rotate at a certain angle, and the other end of the coil spring attached to the tip of the movable spring piece is bent and contracted against the elastic force, and the space in the cover is By engaging with the inner tip and pressing the cover from the outside, the cover rotates, the coil spring increases its degree of contraction, and exceeds one point (dead center) in the rotation process. The coil spring instantaneously reverses and expands in the opposite direction, causing the movable spring piece to recur and its contact to collide and press against the contact in the opposite position, and when the pressing force is released, it returns to its original position and reverses. By using a coil spring instead of the conventional semi-circular spring, the stroke required for switching the switch can be made much smaller than before, and the main part of the switch can be covered. This protects the switch from dust and external impacts, allowing it to maintain full operability and increase durability.

Hereinafter, the configuration of the present invention will be explained with reference to an example. One or two fixed contact pieces 3 are embedded in an insulating base 1 (embedded by insert molding at the same time as the plastic molding of the insulating base 1). At the same time, the movable spring piece 2, which has a spring seat 7 at the tip of a thin elastic leaf spring piece made of phosphor bronze, etc., is placed parallel to the fixed contact piece 3 and with both contacts 3a and 2a facing each other in the same manner. A switch body A is provided by burying the switch body A, while a space C is formed inside by molding transparent plastic or the like to accommodate substantially the entirety of the fixed contact piece 3 and the movable spring piece 2 of the switch body A; An engaging portion 8 for engaging the tip of the coil spring 12 attached to the spring seat 7 at the tip of the movable spring piece 2 is provided at the tip in the space C, and a pivot portion 10 is provided below the opening 9. If necessary, a flat box-shaped cover B with a pusher 11 protruding from the external tip is provided, and the cover B is placed on the switch body A, and the fixed contact piece 3 and the movable spring piece 2 are placed in the space C. The coil spring 12 is stretched between the spring receiver 7 at the tip of the movable spring piece 2 and the engagement part 8 of the cover B, and its elastic force causes the movable spring piece 2 to recoil. By bending the contact 2a to the contact 3a ₁ of one of the fixed contact pieces 3, the pivot portion 10 of the cover B is attached to the side of the insulating base 1, for example, on one side (the insulating base 1
Alternatively, the cover B is pivotably attached by fitting the pivot shaft 10a protruding from the cover B) into a shaft hole 10b cut in one side or a recess, and the cover B is mounted so as to be rotatable at a fixed angle using the pivot portion 10 as a fulcrum. It is something.

In the above configuration, when the outside of the tip of the cover B on the side of the pivot 10 is pressed P, the cover B rotates about the pivot 10 and at the same time tension is created between the tip of the movable spring piece 2 and the engagement part 8. The distal end of the installed coil spring 12 also rotates, and the degree of bending and contraction of the coil spring 12 increases, and at the same time as the coil spring 12 crosses one point (dead center) in the rotation process. Since the direction of action of the elastic spring force is changed to the opposite direction, the movable spring piece 2 instantly reverses and bends, and its contact point 2a collides with the contact point _3a2 of the fixed contact piece 3 on the opposite side. Moreover, at the same time as the pressing force P is released, the cover B is rotated to its original state about the pivot 10 as a fulcrum by the elastic force of the coil spring 12, and the movable spring piece 2 is reversed at the moment it crosses a point in the rotation process. The contact points 3a ₁ and 2a are brought into contact with each other under pressure again as they were in their original state after being bent back to their original state.

The means for pivotally connecting the pivot portion 10 of the cover B and the insulating base 1 is not only the illustrated example of fitting the shaft and the small hole, but also any other suitable means such as concave-convex fitting or shaft insertion.

In addition, the shape of the cover B covers and accommodates almost the entire fixed contact piece 3, movable spring piece 2, etc. (the switch part protruding to one side of the insulating base) as a configuration of the space C, and they are arranged in the space. The engaging portion 8 and the pivot portion 10 have a shape and width that do not hinder operation.
Everything else is completely optional.

Since the switch of the present invention has the above-described structure and function, it has the following excellent features.

b) A coil spring (this proposal) or _a semi-circular arc _spring (conventional ), coil springs require a much smaller stroke than semi-circular springs, making it possible to construct switches with small switching strokes and extremely compact switches. Applications can be greatly increased.

(b) Since it is a coil spring, its length and elastic force can be adjusted freely, and therefore, contrary to the above, it is possible to freely configure a switch with a longer stroke than the conventional one.

C) Semicircular arc springs require a specific configuration in order to engage with the tip of the movable spring piece and the presser so that they do not fall off, and are difficult to process and form because they are extremely small parts. The work of setting the spring on the part used to be tedious and manual work, but since the present invention uses a coil spring, it has the advantage of being extremely simple and easy to process and install.

d) Since semicircular arc springs use leaf springs, there is a limit to their durability if they are made thinner or smaller than a certain limit, so they must be thicker and larger than a certain level. However, in the case of coil springs, even if the wires are thin and the overall size is extremely small, they have excellent durability. Combined with the small stroke, it is possible to construct a switch that is much smaller than the conventional one.

e) In addition, the switch part is covered with a rotatable cover, and the cover and the movable spring piece work together to protect the switch part from dust and external shocks, and the switch can be operated from the outside of the cover without any hindrance. Since we were able to operate the switch, we covered the main parts of the switch with a cover to increase its durability.
As a result, it has great benefits in that its performance has been improved to the level of a so-called micro switch, which has a highly complex sealed structure.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view and a partially cutaway plan view of a switch according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional front view and a partially cutaway plan view of a cover, and Fig. 3 is a conventional reversing spring type switch. It is a front view of an example of a switch. Number, A...Switch body, B...Cover, C...Space, 1...Insulating base, 2...Movable spring piece, 2a...
The contact, 3...Fixed contact piece, 3a...The contact, 4
...Press element, 5...Semi-circular arc spring, 7...Spring catch, 8
...Engagement part, 9...Opening part, 10...Pivotal part, 10a...
Pivot, 10b...shaft hole, 11...presser, 12...coil spring.

Claims (1)

[Claims] 1. One or two fixed contact pieces 3 are buried in the insulating base 1, and a thin elastic movable spring piece 2 is similarly buried in parallel to the fixed contact pieces 3 to make a switch. While the main body A is provided, a space C is formed inside to accommodate almost the entire switch main body A, and an engaging portion 8 is provided at the tip of the space C.
At the same time, a box-shaped cover B with a pivot support 10 is separately installed at the lower part of the opening 9, the cover B is placed on the switch body A, and the fixed contact piece 3 and the movable spring piece 2 are placed in the space C as the base. The coil spring 12 is stretched between the tip of the movable spring piece 2 and the engagement part 8 of the cover B in a contracted state, and the elastic force bends the movable spring piece 2 and the contact point is moved to one side. The cover B is elastically pressed against the contact point of the fixed contact piece 3, the pivot portion 10 of the cover B is appropriately pivoted to the side surface of the insulating base 1, and the cover B is attached to the switch body A so as to be rotatable at a certain angle. , movable spring switch with cover.