JPS6110274Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an automatic return type push button switch that is used by being attached to an operation panel or the like.

An example of a conventional automatic return type push button switch is the one shown in FIG. This thing is
It is composed of an operating mechanism section 1 and a contact section 2.

The operating mechanism section 1 includes a rod 6 having a threaded portion 3 at one end, a conical pointed head 4 at the other end, and a flange 5 at the middle portion, which is fixed to a panel 7 with a nut 8. The active end of the spring 13, which is held via the guide 12 on the inner frame 11 fixed to the outer frame 10, is crimped onto the end face of the flange 5. The end face and the flange portion 5 are brought into contact with each other. Further, an operating push button 14 is attached to the threaded portion 3.

On the other hand, the contact portion 2 includes a movable plate 17 having a plurality of holes 15 and swingably supported by plate springs 16 at both ends.
and contacts 18 whose tips are inserted into holes 15 at both ends.

The contact portion 2 and the operating mechanism portion 1 are connected to the outer frame 1.
It rotates around a fulcrum 19 supported at 0, and is interlocked via a lever 20 whose tip is inserted into a hole 15 in the center of the movable plate 17.
That is, during operation, press the push button 14 to release the rod 6.
Place the pointed head 4 on the roller part 21 of the lever 20,
By rotating the lever 20 around the fulcrum 19,
The movable plate 17 is moved to the right in FIG. 1 to switch the contact 18.

Furthermore, when returning the contact point 18 to its original position, when the pressing force of the push button 14 is weakened, the restoring force of the spring 13 causes the rod 6 to move until the flange 5 and the end surface of the bearing 9 come into contact with the push button 14 side. . At this time,
The contact 18 returns to its original position due to the restoring force of the leaf spring 16.

However, in this conventional structure, the rod 6 is biased by the force of the spring 13, so the push button 1
When the rod 4 is released, the rod 6 is accelerated and moves, and the end face of the bearing 9 collides with the flange 5, generating an impact force. Due to the impact force, the threaded part, for example, the push button 1
4. This causes the nuts 8, etc. to gradually loosen.
Further, since the impact force of the rod 6 is transmitted to the push button 14, the operator feels discomfort.

In view of the current situation, the present invention was developed with the aim of alleviating the impact force generated when the flange of the rod accelerated by the spring force collides with the end face of the bearing. That is, the flange of the rod and the inner surface of the support are made to face each other via the elastic ring, and when the rod automatically returns, the elastic ring is deformed by a predetermined amount or more due to the urging force (restoring force) of the spring, and then the rod is inserted into the support. A stopper that comes into contact with the surface is provided integrally with the rod,
The purpose is to improve the durability of the elastic ring and solve the above problems.

The present invention will be explained below based on an embodiment shown in FIGS. 2 and 3. In addition, the same parts as the conventional example are given the same numbers and the explanation is omitted.
Only the different parts will be explained.

The rod 24 has a female thread 25 on one end, a conical point 26 on the other end, and a flange 2 on the middle.
7 further includes an O-ring groove 28 on one end surface side of the flange 27.
are formed respectively. An O-ring 29 serving as an elastic ring is provided in the O-ring groove 28 and faces the end surface of the bearing 9.

On the other hand, there is a rod 24 on the pointed head 26 side of the flange 27.
A downwardly concave spring receiver 30 having an edge on the outer periphery is provided, which is fitted into the spring receiver 30 , and supports a spring 31 . The outer edge of the spring receiver 30 is opposed to the inner surface of the outer frame 10, so that when the rod 24 returns, the spring receiver 30
When the rod 24 is moved upward in FIG. 3 by the restoring force of the spring 31 transmitted through the O-ring 29 and the O-ring 29 is deformed by a predetermined amount, the spring receiver 30
The outer edge of the outer frame 10 is configured to abut against the inner surface of the outer frame 10.

When operating the automatic return type push button switch 32, the lever 20 is rotated about the fulcrum 19 by pressing the operating push button 14 and protruding the point 26 of the rod 24 toward the contact portion 2. The movable plate 17 supported by the plate spring 16 is moved to the right in FIG. 2, and the contact 18 is switched.

Also, when returning the contact point 18, push button 1
By weakening the pressing force of 4, the restoring force of the spring 31 causes the rod 24 to move through the spring receiver 30.
is moved in the direction of push button 14. Then, contact 1
8, the movable plate 17 moves to the left in FIG. 2 due to the restoring force of the leaf spring 16, and is switched.

At this time, the rod 24 is accelerated and returned to its original position by the restoring force of the spring 31. However, since the O-ring 29 is interposed between the end face of the bearing 9 and the flange 27,
The elasticity of the O-ring absorbs the energy of the collision and weakens the impact force that was previously generated, eliminating the cause of loosening of the screw part and reducing the impact force transmitted to the push button 14, eliminating the discomfort that was previously felt by the user.

Furthermore, when the O-ring 29 is deformed by a predetermined amount due to the restoring force of the spring 31 transmitted via the spring receiver 30, the outer edge of the spring receiver 30 comes into contact with the inner surface of the outer frame 10, so that the restoring force of the spring 31 is reduced. Since the restoring force of the spring 31 acts on the outer frame 10 via the spring receiver 30, the restoring force of the spring 31 does not act on the O-ring 29, thereby preventing the O-ring 29 from being deformed by more than a predetermined amount. Therefore, the amount of wear on the O-ring 29 can be reduced, and the life of the O-ring 29 can be increased.
In this embodiment, the stopper is formed by the spring receiver 30, but the stopper may be formed integrally with the collar portion 27, or may be formed integrally with the shaft portion of the rod 24, for example.

As explained above, the present invention makes it possible to reduce and absorb impact force by the elastic force of the elastic ring. Therefore, it is possible to prevent the threaded portion from loosening, and to alleviate the discomfort experienced by the operator.

Further, since the amount of deformation of the elastic ring is prevented from exceeding a predetermined value, the life of the elastic ring can be improved.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing a conventional automatic return type push button switch, Fig. 2 is a partial sectional view of an automatic return type push button switch showing an embodiment of the present invention, and Fig. 3 is an enlarged view of section A in Fig. 2. It is a diagram. 9...Bearing, 10...Outer frame, 11...Inner frame, 1
4...Push button, 18...Contact, 24...Rod, 2
7... Flange, 28... O-ring groove, 29... O-ring, 30... Spring receiver, 31... Spring, 32... Automatic return type push button switch.

Claims (1)

[Scope of utility model registration request] It has a rod that is supported by the support body so as to be able to freely slide in the axial direction, projects outward from the support body by a spring, and is biased to engage with the inner surface of the support body by a flange provided at an intermediate portion. In an automatic return type push button switch in which the switch is opened and closed by being pushed against a spring, the flange portion and the inner surface of the support body are made to face each other via an elastic ring, and the biasing force of the spring is applied when the rod is automatically returned. An automatic return type push button switch characterized in that a stopper is integrally provided on the rod, the stopper coming into contact with the inner surface of the support body when the elastic ring is deformed by a predetermined amount or more.