JPH0935576A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost and to form into hypersmall size while ensuring a margin of stress, by constituting a movable switch member bent after punch molding out of a plate material having conductivity and springiness. SOLUTION: A plate material having conductivity and springiness, after punch molding, is bent to constitute a movable switch member 4. In this member 4, a notch along the lengthwise direction is provided in a lateral direction with a prescribed interval in a plate main unit 10, to form a fixed contact part 14 and the first/second connection parts 17, 18 or the like. That is, the first connection part 17 for connecting the part 14, spring piece part 15, movable contact part 16 and the parts 14, 15, and the second connection part 18 for connecting the parts 15, 16, are formed in the member 4. The part 14 is bent in one direction (downward direction) relating to the part 17, and the part 15 is bent in the other direction (upward direction) relating to the part 17, to bend the part 16 in one direction (downward direction) relating to the part 18. In this way, a margin of stress is ensured, so that reducing a cost and forming hyper small size can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch,
The present invention relates to a detection switch suitable for application to a VTR cassette, a floppy disk drive device, and the like.

[0002]

2. Description of the Related Art In a conventional detection switch, for example, a common terminal 32 and a normally open terminal 33 are fixed on a base 31 as shown in FIG.
A base end portion of the lever 4 is fixed, a push button 36 is movably supported in an axial direction of the cover 35 that covers the base 31, and a lower end portion thereof is a lever whose base end portion is fixed to the cover 35. It contacts the free end of 37.

The movable piece 34 has a spring property and its contact point 34.
a is constantly urged away from the normally open terminal 33, its free end abuts against the lever 37, and this lever 7 is also urged to constantly push up the push button 36.

When the push button 36 is pushed down, the lever 37 pushes the movable piece 34, and its contact 34a.
Comes into contact with the normally open terminal 33 to bring the common terminal 32 and the normally open terminal 3 into conduction, and the object is detected after the circuit is closed.

In addition, as a conventional switch, the actual fairness is 5-4.
There is a technique disclosed in Japanese Patent No. 4977. This disclosed technique includes a common terminal, a normally closed terminal, and a normally open terminal. As a result, the normally-closed terminal and the normally-open terminal are selectively contacted by a torsion coil spring that constitutes a movable contact piece. And a double throw switch for switching the normally open terminal by a torsion coil spring.

[0006]

However, in the former switch of the related art, the movable piece 34 and the lever 3 are used.
Since 7 is a separate part, the number of parts is large and the cost is high, bending at the time of assembly, stroke management is difficult, and assembly from one direction is difficult and automation of assembly is difficult. .

Further, in the above-mentioned conventional latter switch, there is a problem that the cost increases because a special torsion coil spring is used as the movable contact piece.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a switch having a stress margin, low cost, and an ultra-small size.

[0009]

In order to achieve the above object, a switch according to the invention of claim 1 has at least a common terminal and a terminal provided in a housing, and a pusher movably held in the housing. A button; and a movable switch member that is provided in the housing and has one end contacting the common terminal and elastically deformed by the pressing of the push button to selectively contact the terminal. It is characterized in that it is formed by punching, forming and bending a conductive plate material having spring properties.

As described above, since the movable switch member is formed by punching and bending a conductive and springy plate material, a stress margin is secured, and a low-cost, ultra-miniature size switch is provided. be able to.

In order to achieve the above object, the switch according to the invention of claim 2 is the switch according to claim 1, wherein the common terminal, the normally closed terminal, and the normally open terminal are provided at the bottom of the housing. And the movable switch member has one end contacting the common terminal and elastically deformed by the pressing of the push button to selectively contact the normally closed terminal and the normally open terminal.

In order to achieve the above object, the switch according to the invention of claim 3 is the switch according to claim 1 or 2.
In the switch described above, the movable switch member is provided in a plate main body with notches along a longitudinal direction thereof at predetermined intervals in a lateral direction, and a fixed contact piece portion, a spring piece portion, and a movable contact piece portion. And a first connecting portion that connects the fixed contact piece portion and the spring piece portion, and a second connecting portion that connects the spring piece portion and the movable contact piece portion, respectively, and the fixed portion The contact piece portion is bent in one direction with respect to the first connecting portion, the spring piece portion is bent in the other direction with respect to the first connecting portion, and the movable contact piece portion is bent with respect to the second connecting portion. It was constructed by bending in the direction.

Therefore, as compared with a straight movable piece that is not bent, the span thereof can be shortened and the spans L1 and L2 having a spring property can be secured, and a smaller switch can be provided. .

In order to achieve the above object, the switch according to the invention of claim 4 is the switch according to claim 3, wherein the fixed contact piece portion is brought into contact with the contact portion of the common terminal, and The contact portion of the push button was brought into contact with the second connecting portion, and the movable contact piece portion was brought into sliding contact with the bottom portion of the housing to float the first connecting portion.

Further, in order to achieve the above object, a switch according to a fifth aspect of the present invention is the switch according to the fourth aspect, wherein the housing includes a case and a cover fitted and locked in the case. The cover,
A button insertion hole portion and a holding portion for fixing the fixed contact piece portion of the movable switch member to the contact portion of the common terminal are provided, and a return portion is formed at an abutting portion of a tip portion of the push button. A split groove was formed along the axis from the contact portion.

Therefore, the push button is slidably mounted in the button insertion hole of the cover, the movable switch member is inserted into the case, and the case is covered and fixed. As a result, the pressing portion of the cover presses the fixed contact piece portion of the movable switch member, and the contact portion of the push button contacts the second connection portion of the movable switch member to assemble the switch. It is possible to assemble from one direction,
Automatic assembly can be possible.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an explanatory view of the internal structure of a switch according to the present invention, FIG. 2 is a plan view of the switch with a part omitted, FIG. 3 is a side view of the switch with a part omitted, and FIG. 4 is a perspective view of a movable switch member. It is a figure.

The switch according to the present invention comprises a housing 3 comprising a case 1 and a cover 2, and a movable switch member 4.
And a push button 5. The case 1 is a box-shaped body having an open upper surface, and the cover 2
Has its lower surface and front and rear surface portions opened, a button insertion hole portion 6 is provided on the left side of the upper surface portion 2a, and the inner surface of the upper surface portion 2a is provided on the left side of the cover 2. A pressing portion 7 is provided so as to hang down from the portion.

A common terminal 8 and a normally open terminal 9 are attached to the bottom surface 1a of the case 1 by insert molding. The contact points 8A and 9A of the common terminal 8 and the normally open terminal 9 are the bottom surface. It is exposed on the surface of part 1a,
Terminal legs 8B of the common terminal 8 and the normally open terminal 9,
9B projects outward from both sides of the case 1.

The movable switch member 4 is formed by punching a conductive plate material having a spring property and then bending it. That is, the movable switch member 4 includes the plate body 10
The slits 11 and 12 along the longitudinal direction of the fixed contact piece portion 1 are formed at predetermined intervals in the lateral direction (width direction).
4, a spring piece portion 15, a movable contact piece portion 16, a first connecting portion 17 connecting the fixed contact piece portion 14 and the spring piece portion 15,
A second connecting portion 18 that connects the spring piece portion 15 and the movable contact piece portion 16 is formed respectively.

The free end portion of the fixed contact piece portion 14 is formed as a fixed side contact portion 14A having the same width as the plate body 10, and the free end portion of the movable contact piece portion 16 is curved to form a movable contact. Part 16A. Further, the movable contact piece portion 16 has a split groove 19 formed from the movable contact portion 16A side to the second connecting portion 18, and is split in two to improve the spring property.

The fixed contact piece portion 14 is bent in one direction (downward) with respect to the first connecting portion 17, and the spring piece portion 15 is in the other direction (upward) with respect to the first connecting portion 17. The movable contact piece portion 16 is bent in one direction (downward) with respect to the second connecting portion 18.

The push button 5 has an abutting portion 2 at its tip.
A return portion 21 is formed at 0, and a split groove 22 is formed from the contact portion 20 along the axis.

The button insertion hole 6 of the cover 2
Then, the push button 5 is inserted by reducing the diameter of the split groove 22 by pushing the contact portion 20 at the tip end thereof, and when the return portion 21 passes, the contact portion 20 is elastic. And push the push button 5 into the cover 2
It is slidably attached to.

Then, the movable switch member 4 is inserted into the case 1 through the upper opening 1B thereof, and the fixed side contact portion 14A of the fixed contact piece portion 14 is connected to the contact portion 8A of the common terminal 8. While contacting, the movable contact piece 16
The movable contact portion 16A is brought into contact with the contact portion 8A of the common terminal 8 and the bottom surface portion 1a between the normally open terminal 9 and the contact portion 9A.

Then, by covering the case 1 with the cover 2, the cover 2 is fixed to the case 1 by a locking means (not shown), and at the lower end of the pressing portion 7 in the cover 2, the movable switch member 4 is fixed. While pressing the end portion of the fixed side contact portion 14A of the fixed contact piece portion 14, the push button 5
The contact portion 20 is contacted with the second connecting portion 18 of the movable switch member 4 to form a switch.

Next, the operation of the switch configured as described above will be described. When the second connecting portion 18 of the movable switch member 4 is pushed down by pushing the push button 5, the spring piece portion 15 and the fixed contact piece portion 14 are bent downward, and the movable contact piece portion 16 is The movable contact portion 16A is shown in FIG.
By moving to the right to contact the contact portion 9A of the normally open terminal 9 and releasing the pressing of the push button 5, the spring force of the spring piece portion 15 and the fixed contact piece portion 14 causes The movable contact piece portion 16 rises and the movable contact portion 16A moves to the left in FIG. 1 to separate from the contact portion 9A of the normally open terminal 9 to perform a switch action.

In the above-described embodiment of the present invention, the common terminal 8 and the normally open terminal 9 are attached to the bottom surface 1a of the case 1 by insert molding. Although the respective contact portions 8A and 9A of 9 are exposed on the surface of the bottom surface portion 1a, in the switch of the present invention, as shown in FIG.
In addition to the common terminal 8 and the normally open terminal 9, a normally closed terminal 24 is attached to a by insert molding, and a contact portion 24A of the normally closed terminal 24 is provided with a contact portion 8A of each of the common terminal 8 and the normally open terminal 9, 9A and the movable contact piece 1
6 of the movable contact portion 16A of the contact point 24 of the normally closed terminal 24
You may make it slide-contact with A.

As described above, in the embodiment of the present invention, since the movable switch member 4 is formed by punching and bending a conductive and springy plate material, it is possible to reduce the cost. In addition, the fixed contact piece portion 14 is in one direction (downward) with respect to the first connecting portion 17.
The spring piece portion 15 is bent into a first connecting portion 17
Since it is bent in the other direction (upward direction), the span thereof is shorter than that of the straight movable piece which is not bent, and the span L having the spring property is provided.
1 and L2 can be secured. Therefore, a smaller switch can be provided.

Further, the button insertion hole portion 6 of the cover 2
The push button 5 is slidably mounted on the case 1, the movable switch member 4 is inserted into the case 1 through the upper opening 1B of the case 1, and the case 1 is covered with the cover 2 as shown in FIG. The cover 2 is fixed to the case 1 by a non-locking means, and the lower end portion of the holding portion 7 in the cover 2 presses the end portion of the fixed side contact portion 14A of the fixed contact piece portion 14 of the movable switch member 4. Together with the push button 5
It is possible to assemble the switch by abutting the contact portion 20 on the second connecting portion 18 of the movable switch member 4, enabling the assembly from one direction, and enabling automatic assembly.

Moreover, the common terminal 8 and the normally open terminal 9 are attached to the bottom surface 1a of the case 1 by insert molding, and the contact portions 8A and 9A of the common terminal 8 and the normally open terminal 9 are the bottom surface portion. The shape of the case 1 can be simplified by the configuration exposed on the surface of 1a.

[0032]

As described above, in the switch according to the invention of claim 1, at least the common terminal and the terminal provided in the housing, the push button movably held in the housing, and the inside of the housing. A movable switch member, one end of which is in contact with the common terminal and which is elastically deformed by pressing the push button to selectively contact the terminal, wherein the movable switch member is electrically conductive and has a spring property. Since the movable switch member is formed by punching and bending the plate member having the conductive switch member, the movable switch member is formed by bending the plate member after punching and molding the conductive switch member, so that a stress margin is secured, and the cost is low and the size is very small. A size switch can be provided.

A switch according to a second aspect of the present invention is the switch according to the first aspect, wherein a common terminal, a normally closed terminal, and a normally open terminal are provided on the bottom of the housing, and the movable switch member is The effect of the invention according to claim 1, wherein one end thereof is in contact with the common terminal and is elastically deformed by pressing the push button to selectively contact the normally closed terminal and the normally open terminal. The same effect as can be obtained.

A switch according to a third aspect of the present invention is the switch according to the first or second aspect, wherein the movable switch member is provided in a plate body and a cut along the longitudinal direction thereof is predetermined in the lateral direction. A fixed contact piece portion, a spring piece portion, a movable contact piece portion, a first connecting portion that connects the fixed contact piece portion and the spring piece portion, and a spring piece portion that are spaced apart from each other. A second connecting portion that connects the movable contact piece portion is formed, and the fixed contact piece portion is bent in one direction with respect to the first connecting portion, and the spring piece portion is formed into the first connecting portion. On the other hand, by bending the movable contact piece portion in the other direction and bending the movable contact piece portion in the one direction with respect to the second connecting portion, not only the same effect as the effect of the invention of claim 1 can be obtained. When its span becomes shorter compared to a straight movable piece that is not folded The span L having a spring property
1 and L2 can be secured, and a smaller switch can be provided.

According to a fourth aspect of the present invention, in the switch according to the third aspect, the fixed contact piece portion is brought into contact with the contact portion of the common terminal, and the push button is attached to the second connecting portion. By bringing the abutting portion into contact and sliding the movable contact piece portion to the bottom portion of the housing to float the first connecting portion, the same effect as that of the invention of claim 1 can be obtained. In addition to being obtained, the span can be shortened and the spans L1 and L2 having the spring property can be secured as compared with the straight movable piece that is not bent, and a smaller switch can be provided.

A switch according to a fifth aspect of the present invention is the switch according to the fourth aspect, wherein the housing includes a case and a cover fitted and locked in the case, and the cover has a button. The insertion hole portion and the holding portion for fixing the fixed contact piece portion of the movable switch member to the contact portion of the common terminal are provided, and the return portion is formed at the abutting portion of the tip portion of the push button. By forming the split groove along the shaft center from the contact portion, not only the same effect as the effect of the invention of the above-described claim 1 can be obtained, but also the push button slides in the button insertion hole portion of the cover. The movable switch member is inserted into the case so that the movable switch member can be inserted into the case, and the cover is fixed to the case so that the fixed contact piece portion of the movable switch member is held by the pressing portion of the cover. Press In addition, the switch can be assembled by abutting the contact portion of the push button with the second connecting portion of the movable switch member, enabling assembly from one direction and enabling automatic assembly. You can

[Brief description of drawings]

FIG. 1 is a structural explanatory diagram of an internal structure of a switch (Embodiment 1) according to the present invention.

FIG. 2 is a plan view of the switch with a part thereof omitted.

FIG. 3 is a side view of the switch with a part thereof omitted.

FIG. 4 is a perspective view of a movable switch member.

FIG. 5 is a structural explanatory diagram of an internal structure of a switch (second embodiment) according to the present invention.

FIG. 6 is a structural explanatory view of an internal structure of a conventional switch.

[Explanation of symbols]

 1 case 2 cover 3 housing 4 movable switch member 5 push button 8 common terminal 9 normally open terminal (terminal)

Claims (5)

[Claims] 1. A push button movably held in the housing, at least a common terminal provided in a housing, a push button movably held in the housing, and one end of the push button contacting the common terminal and the push button. And a movable switch member which is elastically deformed by the pressing force of the movable switch member to selectively contact the terminal, and the movable switch member is formed by punching and bending a conductive and springy plate material. . 2. A common terminal on the bottom of the housing,
A normally-closed terminal and a normally-open terminal are provided, and the movable switch member has one end thereof in contact with the common terminal and is elastically deformed by pressing of the push button so that the normally-closed terminal and the normally-open terminal are connected. The switch according to claim 1, wherein the switch is selectively contacted. 3. A fixed contact piece portion, a spring piece portion, and a movable contact piece portion, wherein the movable switch member is provided in a plate body with cuts along a longitudinal direction thereof at predetermined intervals in a lateral direction. And a first connecting portion that connects the fixed contact piece portion and the spring piece portion, and a second connecting portion that connects the spring piece portion and the movable contact piece portion, respectively, and the fixed portion The contact piece portion is bent in one direction with respect to the first connecting portion, the spring piece portion is bent in the other direction with respect to the first connecting portion, and the movable contact piece portion is bent with respect to the second connecting portion. The switch according to claim 1 or 2, wherein the switch is bent in a direction. 4. The movable contact portion is fixed to the housing by bringing the fixed contact portion into contact with the contact portion of the common terminal and the contact portion of the push button into contact with the second connecting portion. The switch according to claim 3, wherein the first connecting portion is floated by slidingly contacting the bottom portion. 5. The housing comprises a case and a cover fitted and locked in the case, and the cover has a button insertion hole portion and the fixed contact piece portion of the movable switch member common to the cover. 5. A pressing portion for contacting and fixing to a contact portion of a terminal is provided, a return portion is formed at an abutting portion of a tip portion of the push button, and a split groove is formed from the abutting portion along an axis. switch.