JPH0411317Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a push button switch, and particularly to one having an operating portion with a relatively large area.

[Prior art]

A pushbutton switch may be used, for example, to operate a bell. Conventionally, a push-button switch used to operate such a bell has a cylindrical body with an opening at the top, a contact point is provided at approximately the center of the bottom surface, an operating member is fitted into the opening, and the contact point is inserted from the center of the inner surface of the operating member. There was one in which a rod-shaped portion extending toward the side was provided, and a spring member was provided between the inner surface of the operating member and the bottom surface of the cylindrical body. In such a push button switch, when the operating member is pushed down against the force of the spring, the rod-shaped portion closes the contact point, and when the force pushing down the operating member is removed, the operating force of the spring member causes the operating member to close. is pushed up, and the bar-like part is also pushed up, opening the contact.

[Problems to be solved by the invention] Generally, such push-button switches are small enough that the operating member can be pushed by a person's finger, but in recent years, in view of improvements in physique, etc., the operating member has been changed. There was a desire to develop something significantly larger than the conventional one. For something as large as this,
If an extended configuration is adopted, there is a problem in that if the peripheral portion of the operating portion is pressed instead of the center, the contacts may not be reliably closed.

The object of this invention is to provide a push-button switch having a relatively wide operating section that solves the above-mentioned problems.

[Means for solving the problem] Therefore, this invention has a main body having an opening in the upper surface, an operating member fitted in the opening, and a position lower than the operating member on the inner circumferential wall of the main body. a protrusion that is provided so as to be able to come into contact with the edge of the operating member; a spring member provided;
The spring member is provided with a tongue-shaped portion located below the spring member, and a switch portion provided within the main body portion so as to be located below the tongue-shaped portion, and the switch portion is configured to push up the operating member. the distance b between the operating member and the protrusion in the closed state, the distance c between the tongue-like part and the switch member, the distance d between the tongue-like part and the spring member, and the stroke s for closing or opening the switch part. , d>b>2(c+s).

[Effect]

According to this invention, when the central part of the operating member is pushed down, the spring member and the tongue part are pushed down while maintaining the distance d between them, and when they move by c+s, the switch part is operated. At this time, since b is larger than c+s, the operating member has not yet contacted the protrusion. When the operating member is pushed down further, only the spring member is pushed down. At this time, since d is larger than b, the spring member does not hit the tongue-shaped portion before the operating member contacts the protrusion, and the switch member is not damaged.

Also, when one of the edges of the operating member is pushed down, this edge moves by b and comes into contact with the protrusion,
Further depression is prevented. This movement is
This is done using the edge to be pushed down as the point of effort, and the edge opposite to the operating member with the center in between as the fulcrum. At this time, the center of the operating member becomes the point of action and moves approximately b/2. Since b is selected to be larger than 2(c+s), the switch section is operated.

〔effect〕

As described above, according to this invention, the switch member can be opened or closed by pressing any part of the operating member. Furthermore, when the center of the operating member is pressed, the movement distance of the center of the operating member is greater than when the edge is pushed, but this is absorbed by the spring member and the tongue-shaped portion provided at a distance. Therefore, no extra force is applied to the switch member, and the switch member will not be damaged.

〔Example〕

A first embodiment is shown in FIGS. 1 and 2. 1st
In the figure, 2 is a box-shaped body formed in the shape of a rectangular parallelepiped, and the entire upper surface thereof is open. A frame-shaped body 4 is placed in the upper opening of the box-shaped body 2.
This frame-like body 4 has a relatively large rectangular opening 6 on its upper surface. This box-shaped body 2 and frame-shaped body 4 constitute a main body portion 8.

An operating member 10 having a rectangular planar shape is fitted into the opening 6 of the frame-like body 4, and the operating member 10 is formed in a size such that its peripheral edge can come into contact with the edge of the opening 6. and the remaining part is opening 6.
It is raised so that it is located above the Further, at one end of the frame-like body 4, two protrusions 12, 12 are provided at intervals in the width direction, as shown in FIG.
is provided facing inward. Furthermore, a protrusion 14 that is relatively long in the width direction is provided at the other end of the frame-like body 4 so as to face inward. These protrusions 12,1
As shown in FIG. 1, the inner ends of the protrusions 2 and 14 are located inside the peripheral edge of the operating member 10, and the operating member 10 moves below these protrusions 12, 12, 14. is prevented from doing so.

Further, at the center of the inner surface of the operating member 10, a rod-shaped portion 16 is provided that extends vertically toward the box-shaped body 2 side. A box-shaped body 2 is provided at the end of this rod-shaped part 16.
The tip of the spring member 18 extending inward from the other end of the spring member 18 comes into contact with the spring member 18 and pushes the operating member 10 upward, so that the peripheral edge of the operating member 10 is connected to the peripheral edge of the opening 6 of the frame-like body 4. is in contact with.

In the middle of this spring member 18, this spring member 1
A tongue piece-shaped portion 20 is provided below and parallel to this. A microswitch 22 is provided on the bottom surface of the box-like body 2 so as to be located below the tongue-shaped portion 20. A contactor 24 is provided on the head of this microswitch 22,
By pushing this downward, the built-in contacts are closed, and by removing the force pushing the contact 24, the contacts are opened.

The operating member 10 and the rod-shaped member 16 are integrally molded from synthetic resin, and similarly, the frame-shaped body 4 and the protrusions 12, 12, 14 are integrally formed with the box-shaped body 2 and the spring member 18.
Both the tongue portion 20 and the tongue portion 20 are integrally molded from synthetic resin.

Furthermore, when the operating member 10 is pushed up by the spring member 18 as shown in FIG. The distance from the part 20 is d,
Contact 2 between tongue piece 20 and micro switch 22
4 is c, and the stroke that the contactor 24 moves to close the contact of the microswitch 22 is s. The relationship between b, c, d, and s is d>b>2(c+s).

In the state shown in FIG. 1, when the center of the operating member 10 is pushed down, the rod-shaped portion 16 is also pushed down,
The spring member 18 and the tongue-like portion 20 bend downward while maintaining the distance d, and when they eventually move by a distance c+s, the contact point of the microswitch 22 is closed. At this time, b is selected to be larger than c+s, so when the contact of the micro switch 22 is closed, the operating member 10 is still connected to the protrusion 12,
12, 14 and the operating member 10 is still pressed down. At this time, the tongue portion 20 is in contact with the microswitch 22 and cannot be lowered any further, so the distance between the spring member 18 and the tongue portion 20 is only shortened. Furthermore, d is b
Since the spring member 1 is selected to have a larger size, the spring member 1
8 does not come into contact with the tongue-shaped portion 20. Therefore, before the operating portion 10 contacts the protrusions 12, 12, 14, the spring member 18 contacts the tongue portion 20,
The micro switch 22 will not be damaged due to unnecessary force being applied to it. In addition, in this way, the spring member 18
The strength of the spring member 18 is selected to allow movement of the spring member 18.

When one of the edges of the raised portion of the operating member 10 is pressed down, for example the part marked A in FIG.
The portion A descends using the opposite position across the center as a fulcrum until the edge of the operating member 10 comes into contact with the protrusion 14 . At this time, the moving distance of the rod-shaped member 16 is approximately b/2. This is because the rod-shaped member 16 is located approximately in the center between portions A and B. Here, since b/2 is selected to be larger than c+s, the microswitch 22 can be closed. This is the same no matter which edge of the raised portion of the operating member 10 is pressed down.

Note that whether the center part of the operating member 10 is pushed down or the edge thereof is pushed down, when the force applied to push it down is removed, the spring member 18 returns to its original state and returns to the state shown in FIG. return.

A second embodiment is shown in FIG. This example is
The structure is the same as that of the first embodiment except that a spring 26 is newly provided between the spring member 18 and the bottom surface of the box-shaped body 2. The reason for providing the spring 26 is to prevent the force pushing up the operating member 10 from deteriorating over time since the spring member 18 is made of synthetic resin.

A third embodiment is shown in FIG. This example is
The spring member 18 has the same structure as the first embodiment except that the middle part of the spring member 18 is curved downward to provide a hinge action and improve mechanical life.

In each of the above embodiments, the protrusions 12, 12, 14 were provided at both ends of the frame-like body 4, but they may be provided at both ends, or over the entire inner peripheral surface of the frame-like body 4. good. Further, although the spring member 18 was extended from one end of the box-like body 2 to below the rod-like part 16, it was extended perpendicularly from the bottom surface of the box-like body 2, and from its tip to the bottom end of the rod-like part 16. May be horizontally distracted;
Alternatively, the spring member 18 may be formed by providing a hollow rectangular parallelepiped with an open lower part on the bottom surface of the box-like body 2 and cutting out the upper wall of this rectangular parallelepiped. Further, in the above embodiment, a micro switch is used, but instead of this, a metal contact piece and a metal spring contact piece are used, and when the tongue piece-shaped portion is pressed down, the metal spring contact piece is moved to the metal contact piece. It may be made to contact.

[Brief explanation of drawings]

Fig. 1 is a central vertical sectional view of a first embodiment of the push button switch according to this invention, Fig. 2 is a partially cutaway plan view of the first embodiment, and Fig. 3 is a partially omitted part of the second embodiment. FIG. 4 is a partially omitted central longitudinal sectional view of the third embodiment. 8... Main body, 10... Operation member, 18... Spring member, 20... Tongue-shaped portion, 22... Micro switch.

Claims (1)

[Claims for Utility Model Registration] A main body having an opening in the upper surface, an operating member fitted in the opening, and an operating member located below the operating member on the inner peripheral surface of the main body. a protrusion provided so as to be able to come into contact with the edge; and a protrusion provided substantially horizontally within the main body so as to push up substantially the center of the inner surface of the operating member to bring the edge of the operating member into contact with the edge of the opening. a tabular spring member, a tongue-like part provided on the spring member so as to be located below the spring member, and a switch part provided within the main body part so as to be located below the tongue-like part; a distance b between the operating member and the protrusion when the operating member is pushed up by the spring member; a distance c between the tongue-shaped portion and the switch member; and a distance c between the tongue-shaped portion and the spring member. and the stroke s for opening and closing the switch member.
A push button switch characterized in that there is a relationship of d>b>2(c+s).