JP2528369Y2 - Push button switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push button switch which can be used for various devices.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show the structure of a conventional push button switch. This example shows the structure of a push button switch disclosed in Japanese Utility Model Publication No. 57-49874. In the figure, 1 is an insulating case, 2 is a push button, and 3 and 4A and 4B are contacts. Reference numeral 5 denotes a conductive sphere acting as a movable contact piece. The push button 2 moves upward due to the biasing force of the spring 6 inserted between the conductive ball 5 and the push button 2, and comes into contact with the step 7 to be prevented from coming off. The push button 2 has a projection 8 on the lower end side. The projection 8 raises the conductive sphere 5 to prevent the conductive sphere 5 from contacting the contacts 4A and 4B, and keeps the switch off.

When the push button 2 is depressed, the projection 8 also moves down, so that the conductive sphere 5 also moves downward, making the contacts 4A and 4B conductive, and also electrically connecting the contacts 3 and 4A and 4B. , And send a contact signal.

[0004]

According to the structure of the push-button switch shown in FIGS. 5 and 6, for example, dust or the like adheres to the surface of the conductive ball 5, or dust or the like adheres to the tops of the contacts 4A and 4B. Adhesion may cause a poor contact accident. That is, the structure is such that a self-cleaning operation cannot be obtained between the conductive ball 5 and the contacts 4A and 4B. For this reason, once dust or the like adheres, the dust remains sandwiched between the conductive sphere 5 and the contacts 4A and 4B, resulting in a poor contact accident.

An object of the present invention is to provide a push-button switch in which the movable contact performs a self-cleaning operation, and therefore can maintain reliability for a long period of time.

[0006]

Means for Solving the Problems Claim 1 of the present invention is indispensable.
A pair that is planted on the bottom of the edge case and has a different height from the bottom
Contact and this pair of contacts, and
A push button movably supported by an insulating case and a pair of contacts
Push button that is higher than the bottom and located between these contacts
And extends in a direction perpendicular to the plane containing these contacts.
Shaft, a pair of contact points and an intermediate portion of this shaft are in contact with each other,
The shaft is sandwiched between the integrally formed tongue pieces, and the push button has a seesaw movement
A movable contact piece that can be freely designated and one of the movable contact pieces
Inserted between the end and the lower contact of the pair of contacts.
Rebound between one end of these movable contacts and the short contact
Apply force and press the movable section against the shaft and push button to move the seesaw.
A spring for supporting the movement of the push button.
The switch is configured. In claim 2 of the present invention, the push button is
The core supporting the shaft and the movable contact and the insulation
And a pressing part replaceably mounted on the opposite side of the base.
You .

[0007]

According to the structure of the present invention, the movable contact piece and the second contact are always kept in a conductive state by the return spring. When the push button is pressed down in this state, the movable contact piece becomes the first tall member.
The contact comes into contact with the first contact and the second contact. When the push button is further pushed in from the conductive state, the movable contact piece is pushed by the upper end of the first contact and rotates in a direction to compress the return spring. By this rotation operation, a sliding operation occurs between the first contact and the movable contact piece, and self-cleaning is achieved.

[0008]

1 to 4 show an embodiment of the present invention.
5 and 6 are denoted by the same reference numerals. In this invention, a tall first contact 3 and a second contact 4 shorter than the first contact 3 are implanted on the bottom surface of the insulating case 1, and a movable contact piece 9 is attached to the back of the push button 20 by a shaft 10. Supports the movement of seesaws.

The present invention further proposes a structure in which the movable contact piece 9 is mounted on the core 11 and supported. In other words, push
This is a case where a push button is constituted by the pressure part 2 and the core 11.
The core 11 is formed of a box-like body having an open bottom as shown in FIG. 2, and has two faces 11A and 11B opposed to each other.
And two claws 12 are formed on the insulating case 1.
It engages with the long hole 13 formed in the side wall of the, and prevents it from falling off, and supports it so that it can move up and down along the long hole 13.

On the inner surface of the other two surfaces orthogonal to the surface on which the claw 12 is formed, a groove 15 is formed which is surrounded by two ridges 14 (see FIG. 1). Are pressed into each other to support the shaft 10 inside the core 11. A movable contact piece 9 is rotatably supported on the shaft 10 as shown in FIG. That two tongues 9A on the side edges of the movable contact piece 9, 9B is formed, the tongue 9A, raised off the 9B, coordinated axis 10 between the tongue 9A and 9B, the shaft 10 Tongue It is clamped between the pieces 9A and 9B.

Protrusions 11A and 11B (see FIG. 1) are formed on the ceiling surface of the core 11 so as to face the end of the movable contact piece 9, and the projections 11A and 11B rotate the seesaw movement of the movable contact piece 9. Regulate the movement range. A protrusion 9C is formed downward on the movable contact piece 9, and one end of the spring 6 is engaged with the protrusion 9C. The other end of the spring 6 is engaged with the second contact 4.
FIG. 4 shows the front shapes of the first contact 3 and the second contact 4. First
The contact 3 has a structure in which a concave portion 3A is formed at the upper end, a pair of protrusions 3B and 3C are formed by forming the concave portion 3A, and the movable contact piece 9 is brought into two-point contact with the pair of protrusions 3B and 3C. . The second contact 4 is a protrusion 4 that projects laterally.
A, 4B, and the spring 6 is received by the projections 4A, 4B.

The core 11 is elastically supported at the top dead center position by the biasing force of the spring 6. In addition, the movable contact piece 9 is maintained in an attitude in which an end on the side facing the second contact 4 abuts on the projection 11B and is located above. With such a structure, the element body of the push button switch is formed in advance. The present invention also features a structure in which the pressing portion 2 is mounted later on the element body of the push button switch to complete it. That is, the pressing portion 2
Are formed by projecting two legs 2A and 2B downward.
A nail 2C is formed outside the lower ends of the legs 2A and 2B of the book. The claw 2C is engaged with the elongated hole 16 formed on the side wall of the insulating case 1. The claw 2C can move up and down in the long hole 16. Therefore, when the pressing portion 2 is pressed, the pressing portion 2 can move downward together with the core 11.

When the pressing portion 2 is pressed down, the end of the movable contact piece 9 contacts the upper end of the first contact 3. Due to this contact, the first contact 3 and the second contact 4 are electrically conducted by the movable contact piece 9 and the spring 6 to transmit an ON contact signal. The pressing portion 2 is allowed to move further downward even after one end of the movable contact piece 9 contacts the upper end of the first contact 3. That is, until the other end of the movable contact piece 9 contacts the upper end of the second contact 4, the pressing portion 2
Descent is allowed. In this way, by giving a stroke that can be further pushed after the first contact and the second contact are turned on, the contact between the contacts 3 and 4 can be turned on even if the pushing force of the finger fluctuates slightly. It is possible to prevent the inconvenience of repeating the OFF state from occurring.

[0014]

As described above, according to the present invention, after the movable contact piece 9 comes into contact with the first contact 3 to make the first contact 3 and the second contact 4 conductive, the pressing portion 2 Is further pushed, the movable contact piece 9 is pushed by the upper end of the first contact 3 and rotates. At this time, the movable contact piece 9 slides on the first contact 3 to perform a self-cleaning operation. For this purpose, the contact portion between the movable contact piece 9 and the first contact 3 is constantly sharpened. That is, even if dust adheres, it is removed by the self-cleaning operation, so that the rate of occurrence of poor contact accident can be significantly reduced. As a result, a highly reliable push button switch can be provided. The push button has a shaft 10 attached to it.
The movable contact piece 9 is brought into contact with the contacts 3 and 4 and the movable contact piece 9
The shaft 10 is sandwiched between the tongue pieces 9A and 9B integrated with the
9 is pressed against the shaft 10 and the push button with the spring 6 to move the movable contact piece 9
While holding the robot so that it can move freely.
Return, that is, with one spring, switch on
Rotation of the movable contact piece at the time of
Can be made, the number of parts is small,
The springs can be attached sequentially from the same side, making assembly very easy.
It is.

Further, since the pressing portion 2 is formed separately from the core 11 and the movable contact piece 9 is supported by the core 11 and the pressing portion 2 is freely exchangeable, the pressing portion 2 is previously attached to the insulating case 1. If a product in which only the child 11 is mounted is prepared, a push button of a desired color can be mounted and delivered according to an order. It is also possible to replace the pressing part 2 once assembled. Therefore, there is an advantage that a push button switch that can easily perform manufacturing control can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view for explaining the structure of a push button switch according to the present invention.

FIG. 2 is an exploded perspective view for explaining a structure of a main part of the push button switch according to the present invention.

FIG. 3 is a perspective view for explaining a structure of a movable contact piece used in the push button switch of the present invention.

FIG. 4 is a front view for explaining the structure of a first contact and a second contact used in the push button switch of the present invention.

FIG. 5 is a sectional view for explaining a conventional technique.

FIG. 6 is a sectional view of FIG. 5 as viewed from above.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Insulating case 2 Press part 3 1st contact 4 2nd contact 6 Spring 9 Movable contact piece 10 Axis 11 Core 12 Claw 13, 16 Long hole 14 Protrusion 15 Groove 20 Push button

Claims (2)

(57) [Scope of request for utility model registration] 1. A. First Embodiment B. a pair of contacts implanted on the bottom surface of the insulating case and having different heights from the bottom surface; The pair of contacts and the opposing, movable freely in the projecting direction of its, the push button supported in the insulating case, C. Higher than the pair of contacts above the bottom,
It is located between these contacts and is fixed to the push button.
D. an axis extending in a direction perpendicular to the plane containing The pair of contact points and the intermediate portion of the shaft are in contact with each other,
B. a movable contact piece that sandwiches the shaft with a tongue piece that is integrally formed and that is capable of freely supporting a seesaw motion on the push button; The movable contact piece is inserted between one end side of the movable contact piece and the lower contact of the pair of contacts to give a repulsive force between one end of the movable contact piece and the shorter contact, and The section
The seesaw movement is possible by pressing against the shaft and the push button.
And a spring that supports the push button switch. 2. The push button has a core supporting the shaft and the movable contact piece , and a presser which is replaceably attached to the core on the side opposite to the insulating case. 2. The push button switch according to claim 1, wherein the push button switch comprises a part.