JPH0422494Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a switch having a hinge lever-like movable piece inside.

《Prior art》 A switch equipped with a hinge lever-like movable piece is
For example, it is shown in Japanese Utility Model Publication No. 58-29542.
The movable piece of this switch has a long part and a short part that are movable independently of each other through a slit formed along the longitudinal direction, and its base end is fixed to the case. A movable contact is provided on the short part,
A compressed movable spring is disposed between the short portion and the long portion in the longitudinal direction. By pressing the tip of the long part, the movable spring is deflected, and when it passes a certain point (dead point), the short part is reversed and its contacts are switched. Such a switch is capable of low-gram operation because the ratio between operating pressure (OF) and contact contact pressure (CF) can be increased by means of a hinge lever-like movable piece.

《Problems that the invention attempts to solve》 However, in this type of switch,
The movable spring allows a snap action when switching the contacts, but since the base end of the short part with the movable contact is fixed to the case, it is hardly possible to expect a wiping action from the movable contact.
For this reason, it has not been possible to realize a high-capacity type switch that requires welding resistance.

Therefore, the purpose of this invention is to provide a switch equipped with a hinge lever-like movable piece that is highly resistant to welding.

<Means for solving the problem> The switch according to this invention has a proximal end fixed to the case, and a long part and a short part that are movable independently of each other through a slit formed along the longitudinal direction. A movable contact is provided on the short part, and a compressed movable spring is disposed between the short part and the long part in the longitudinal direction, and the long part is pressed. A switch that switches the contact by reversing the short part using the spring force of a movable spring,
The present invention is characterized in that a deformation allowing portion is provided on the proximal end side of the short portion to be deformed in the longitudinal direction by the spring force of the movable spring accompanying the pressing operation of the long portion.

<<Example>> FIG. 1 and FIG. 2 show an example of this invention. Inside case 1 made of synthetic resin,
A movable side terminal 3 to which the base end of the L-shaped movable piece 2 is attached, and a similarly L-shaped fixed side terminal 5 provided with a fixed contact 4 are each fixed.

As shown in FIG. 3, the movable piece 2 has two slits 2a extending from the short side to the long side of the L-shape.
By providing a continuous end portion on the long side, it is divided into a central portion 2b and a peripheral portion 2c, which are movable independently of each other. A space 2d is formed between the central part 2b and the peripheral part 2c by cutting off a certain amount of the long side end of the central part 2b. Central portion 2d formed in this way
and the surrounding portion 2c are the short portion 2b in this invention.
and a long portion 2c, respectively. Each end of a compressed, substantially U-shaped movable spring 6 is locked to the opposing longitudinal ends of the short portion 2b and the long portion 2c.
As a result, the tip of the long portion 2c becomes the short portion 2d.
It is pressed and biased against.

The longitudinal end portion of the short portion 2b is formed into a bifurcated shape with a slit 2e inserted therefrom, and a movable contact 7 is attached to the lower surface of each of the bifurcated portions, forming twin contacts. And this twin contact point 7
The stationary contact 4, which contacts and separates, is a crossbar contact extending in a direction across these twin contacts 7.

A cover 8 is fitted into the upper opening of the case 1. A boss 8a is formed at one end of the cover 8, and a push button 9 is slidably inserted into a hole 8b that passes through the boss 8a in the axial direction. A stopper tip 10 having a larger diameter than the pushbutton 9 is fixed to the lower end of the pushbutton 9, and serves to prevent the cover from coming off upward and also as a contact for the movable piece 2. A blind hole 1a is formed in a portion of the case 1 that faces this chip 10 via the tip of the movable piece 2,
A return spring 11 is inserted in a compressed state into this hole 1a, and presses the tip of the movable piece 2 against the tip 10 of the push button 9.

Next, the operation of this switch will be explained.
First, in the free state, the push button 9 is pressed upward by the return spring 11, and the movable contact 7 is in contact with the fixed contact 4, as shown in FIG. Next, when the push button 9 is pressed downward, the return spring 11 is compressed and the tip of the movable piece 2 is pressed downward. At this time, a force F in the direction of compressing the movable spring 6 is applied to the movable spring 6, so this force F causes the short portion 2b of the movable piece 2 to move in the direction of the arrow, and the movable contact 7 is brought into contact with the fixed contact 4. It acts as a wiping agent. This movement of the short portion 2b is allowed because the movable piece 2 also has a slit 2a on the short side. In other words, slit 2aa in this part is
This is the deformation allowing part in this invention. Then, when the tip of the movable piece 2 is further pressed down by the push button 9 and exceeds a certain point (dead point), the short part 2b is reversed by the reaction force of the movable spring 6, and the movable contact 7 becomes the fixed contact. 4, the switch becomes open.

In this invention, the deformation allowing portion provided in the movable piece may be formed by curving the base end portion of the short portion 20b to form a deforming allowing portion 20aa, as shown in FIG.
The movable piece 20 shown in this figure has substantially the same structure as the movable piece 2 shown in FIG. 3, except for the shape of the short portion 20b, and its function is also substantially the same, so a redundant explanation will be avoided.

In the above embodiment, the pushbutton 9 is made of stainless steel, but wear of the pushbutton 9 is suppressed, the operating point (OP) is prevented from lowering, and generation of abrasion powder can be prevented. Further, it is possible to reduce the breathing effect during push button operation and to reduce the intrusion of external dust due to the reduced clearance. Since the contacts have a crossbar/twin contact structure, contact reliability is high, and the movable spring 6 and the short part 2b
Since the length of engagement with the movable spring 6 is long, the spring constant of the movable spring 6 can be increased to increase the contact pressure.

<<Effect of the invention>> As described above, the switch according to this invention has a deformation allowing part that allows deformation in the longitudinal direction of the hinge lever-like movable piece equipped with a movable contact point, so that it can be moved easily. A wiping action of the contact on the fixed contact is possible. As a result, the welding resistance is increased, and together with the cleaning effect of the wiping action, the contact reliability is increased, and a small switch with high capacity and low gram operation can be realized.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a switch showing an embodiment of this invention with the cover removed, Fig. 2 is a sectional view of the switch shown in Fig. 1, and Fig. 3 is a movable switch in the switch shown in Fig. 1. An enlarged perspective view of the piece, FIG. 4 is an enlarged perspective view showing a modification of the movable piece. 1...Case, 2...Movable piece, 2a...Slit, 2b...Short part, 2c...Long part, 2aa...
...Deformation allowable part, 3... Movable side terminal, 4... Fixed contact, 5... Fixed side terminal, 6... Movable spring, 7...
Movable contact, 8...Cover, 9...Push button, 10
... Chip, 11 ... Return spring.

Claims (1)

[Scope of utility model registration request] The proximal end is fixed to the case, and the movable piece has a long part and a short part that can be moved independently of each other through a slit formed along the longitudinal direction, and a movable contact is provided in the short part. and a compressed movable spring is disposed between the short portion and the long portion in the longitudinal direction, and by pressing the long portion, the short portion is reversed by the spring force of the movable spring. The switch is configured to switch the contact point by using a deformation permitting section provided on the proximal end side of the short section to be deformed in the longitudinal direction by the movable spring force accompanying the pressing operation of the long section. Features a switch.