JP3820738B2 - Push button switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pushbutton switch, and more particularly to a pushbutton switch that opens and closes a fixed contact by two torsion coil springs.
[0002]
[Prior art]
As shown in FIG. 2, a push button switch using a torsion coil spring as a movable contact is provided with one end of a coil spring 2 urging the push button 1 as a movable contact 6. While sliding on the projecting portion 4 projecting on the peripheral wall surface, the movable contact portion 6 is fixed to the movable contact portion 6 by slidingly contacting a fixed contact 5 provided in the same plane as the surface of the projecting portion 4 below the projecting portion 4. The thing which electrically conducts between the contact parts 5 is provided.
[0003]
However, unlike torsion coil springs and compression coil springs, a torsion coil spring always receives a torsional moment. Therefore, in order to absorb energy with one torsion coil spring, the spring wire diameter must be reduced. There is also a problem that it is thick and the coil inner diameter (coil effective diameter) must be increased, and it cannot contribute to the miniaturization of the entire switch.
[0004]
[Problems to be solved by the invention]
Therefore, as shown in FIG. 3, the two torsion coil springs 7 and 8 are arranged in an L shape, the arms 7a and 8a on the force point side of the torsion coil springs 7 and 8 are overlapped vertically, and the upper torsion is made. It can be assumed that the lower torsion coil spring 8b is pushed down from above with a push button by the arm 7a on the force point side of the coil spring, thereby reducing the load per spring. There is a problem that the installation area of a typical spring increases and the switch becomes larger.
[0005]
Therefore, a technical problem to be solved in order to provide a small and highly durable switch arises, and the present invention aims to solve this problem.
[0006]
[Means for Solving the Problems]
The present invention has been proposed to achieve the above object, and a pair of torsion coil springs are arranged in series via a partition wall on one side of a case body made of an insulating resin material. The force point side arm of one torsion coil spring is elastically contacted from below with the pressing surface of a push button disposed on the other side upper part so as to be movable up and down, and the force point side arm of the other torsion coil spring is connected to the one torsion coil spring. It is arranged so as to elastically contact with the arm on the side of the power point from below, a fixed contact that the one torsion coil spring is always in contact with on one side bottom surface of the case body, and a power point of one torsion coil spring on the other side bottom surface The present invention provides a pushbutton switch provided with a fixed contact that is electrically connected to the fixed contact when the side arm comes into contact therewith.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a partially cutaway view showing an internal structure of a pushbutton switch according to an embodiment of the present invention. A case body 10 made of a molded product of an insulating resin material is formed in a box shape having an upper surface opening. It is closed with a cover 11 made of a resin material to form an accommodation chamber 10a inside. The storage chamber 10a is divided into two chambers by a partition wall 12 having one side extending from the central portion toward the ceiling, and one side 12a of the partition wall 12 and a case main body facing the partition wall 12 are provided on one side thereof. A first torsion coil spring 13 is provided with both ends supported by the inner surface 10b, and the other torsion is supported by the other side 12b of the partition wall 12 and the case main body inner surface 10c opposite to the other torsion coil spring 13. A coil spring 14 is provided. The first and second torsion coil springs 14 are arms on the fulcrum side opposite to the partition wall 12 side in a state where the first and second torsion coil springs 14 are respectively engaged with recesses 20 and 20 formed on one side bottom surface of the body case 10 from above. Reference numerals 13 a and 14 a are respectively fixed to the bottom surface of the case body 10 or the case body 10. The arm 13b on the power point side of the first torsion coil spring 13 extends to the other side of the main body case 10, and is guided to the other end portion side of the cover 11 by guiding the one side surface 12a of the partition wall 12 in the vertical direction. The push button guide portion 15 provided is elastically contacted from below with a push surface 18 of a push button 17 provided so as to be movable up and down, and urges the push button 17 in the return direction. On the other hand, the arm 14b on the force point side of the second torsion coil spring 14 moves in the vertical direction along the other side surface 12b of the partition wall 12, and its tip end portion 14c is directed to the other side of the main body case 10. After appropriately extending, the first torsion coil spring 13 is bent in an L shape below the force point side arm 13b of the first torsion coil spring 13, and the bent end portion 13b supports the force point side arm 13c of the first torsion coil spring 13. And the load which acts on the 1st coil torsion coil spring 13 by the torsion is shared.
[0008]
Further, the first conductive plate 16 of one fixed contact is inserted into the one side bottom surface 10e of the case body 10 so as to contact the first torsion coil spring 13, and the first torsion coil spring is inserted into the other side bottom surface 10f of the case body 10. The second conductive plate 19 of the other fixed contact is inserted so as to be in contact with the arm 13 a on the power point side of 13. Terminals (not shown) formed integrally with the first conductive plate 16 and the second conductive plate 19 are projected from the other end surface of the switch body 10 to the outside. Of course, the push button guide portion 15 of the cover 11 is formed in a cylindrical shape with both ends opened so that the push button 17 can be moved up and down, and the push button 17 has a diameter so that the lower part thereof can be prevented from coming out of the case. The diameter is expanded outward in the direction.
[0009]
In other words, the pushbutton switch according to the present embodiment has the first and second torsion coil springs 13 and 14 arranged in series via the resin partition wall 12 on one side in the case body 10, thereby The arms 13a and 14a can be twisted without buffering, and the arm 13a on the power point side of the first torsion coil spring 13 is extended below the push button 17 to be elastically contacted. The first torsion coil spring 13 and the second torsion coil spring are configured so that the force point side arm 14b of the second torsion coil spring 14 is pressed against the second conductive plate 19 by the arm 13a on the side of the force point. 14 downsizing and downsizing of the entire switch.
[0010]
In this case, as shown in FIG. 1, the height of the concave portion 20 of the case body 10 that supports the second torsion coil spring 14 is made higher than the concave portion 20 that supports the first torsion coil spring 13, thereby The contact point of the arm 13b on the force point side of the first torsion coil spring 13 with respect to the arm 14b on the force point side of the coil spring 14 is set to move from the arm distal end side to the arm proximal end side in response to the push button 17 being pushed down. By doing so, it is possible to set the operating force when the push button 17 is pressed down to be constant, and the push button 17 can be pressed down with a light operating force while the two torsion coil springs are pressed down simultaneously.
[0011]
In the present embodiment, the partition wall 12 is formed integrally with the main body case 10 to prevent short-circuit between the torsion coil springs 13 and 14 and the arm 13b on the force point side of the torsion coil springs 13 and 14. 14b, but in order to prevent a short circuit, it is only necessary to form a film of an insulating material on both side surfaces 12a and 12b of the partition wall 12 by coating, bonding or the like. In order to restrict rotation, the partition wall 12 can be dealt with only by adhering it to the main body case 10.
[0012]
Next, the operation of the push button switch according to the present embodiment will be described in detail with reference to FIG.
In FIG. 1, when the push button 17 is pushed down, the first torsion coil spring 13 that is in elastic contact with the pressing surface 18 of the push button 17 has the one side surface 12 a of the partition wall 12 as a sliding guide surface, That is, the first torsion coil spring 13 is twisted by this depression that is pushed down to the second conductive plate 19 side, and the elastic force against the push button 17 is accumulated. When the push button 17 is further pushed down and the arm 13a on the force point side of the first torsion coil spring 13 comes into contact with the tip 14c of the arm 14b on the force point side of the second torsion coil spring 14, the second torsion is continued. The coil spring 14 is also twisted along the other side surface 12 b of the partition wall 12. When the push button 17 is further pushed down from this pushed-down position, the first torsion coil spring 13 resists the repulsive force of the first torsion coil spring 13 and the second torsion coil spring 14 to the other bottom surface 10f of the case body 10. The first conductive plate 16 and the second conductive plate 19 are brought into electrical contact with each other to contact the buried second conductive plate 19, and the switch is turned on.
[0013]
Next, when the pressing force of the push button 17 is released, the first and second torsion coil springs 13 and 14 are restored by the elastic force stored when the push button 17 is pressed, and are respectively applied to both side surfaces 12a and 12b of the partition wall 12. Restore along. By restoring the torsional state, the arm 13c on the power point side of the second torsion coil spring 14 is detached from the second conductive plate 19, and the switch is turned off. Of course, due to the restoring force of the first torsion coil spring 13, the push button 17 returns to the original position before being pushed.
[0014]
It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified one.
[0015]
【The invention's effect】
As described in detail in the embodiment of the present invention, a pair of torsion coil springs are arranged in series via a partition wall on one side of a case body made of an insulating resin material, and the other side of the body case. The force point side arm of one torsion coil spring is elastically contacted from below with the pressing surface of a push button disposed on the upper part so as to be movable up and down, and the force point side arm of the other torsion coil spring is connected to the force point of the one torsion coil spring. The side arm is arranged so as to be elastically contacted from below, a fixed contact that is always in contact with the one torsion coil spring is arranged on the bottom surface of one end of the case body, and the force point side arm of one torsion coil spring is arranged on the other side bottom surface. Since the fixed contact that is electrically connected to the fixed contact when the contact is provided, the coil spring itself can be reduced in size and short circuit can be prevented, and the entire switch can be reduced in size. Fixed contact Etc. can be achieved self-cleaning, an invention which exhibit positively Chodai Naru effect. Further, the other torsion coil spring is disposed at a higher position than the one torsion coil spring, and the contact point of the arm on the force point side of one torsion coil spring with respect to the arm on the force point side of the other torsion coil spring is Since it is configured to move from the arm distal end side to the arm proximal end side in accordance with the depression, it is possible to set the operation force when the push button is depressed to a constant value, and to depress the two torsion coil springs However, an excellent effect that the push button can be pushed down with a light operation force is exhibited.
[Brief description of the drawings]
FIG. 1 is a partially cutaway view of a pushbutton switch according to an embodiment of the present invention.
2A and 2B are diagrams showing a conventional pushbutton switch, in which FIG. 2A is a plan view and FIG. 2B is a cross-sectional view taken along line AA in FIG. 2A.
FIG. 3 is a plan view showing a conventional push button switch.
[Explanation of symbols]
10 Case body 17 Push button 12 Partition wall 13 First torsion coil spring (one torsion coil spring)
14 Second torsion coil spring (the other torsion coil spring)
16 First conductive plate (fixed contact)
19 Second conductive plate (fixed contact)

Claims (2)

A pair of torsion coil springs are arranged in series via a partition wall on one side of the case body made of an insulating resin material, and one side of the pressing surface of the push button arranged on the other side upper part of the body case is freely movable up and down. The force point side arm of the torsion coil spring is elastically contacted from below, and the force point side arm of the other torsion coil spring is arranged to elastically contact the force point side arm of the one torsion coil spring from below, A fixed contact that is in constant contact with the one torsion coil spring is disposed on one side bottom surface, and is electrically connected to the fixed contact when the force point side arm of one torsion coil spring contacts the other bottom surface. A push button switch characterized by comprising: The other torsion coil spring is disposed at a higher position than the one torsion coil spring, and the contact point of the arm on the force point side of one torsion coil spring with respect to the arm on the force point side of the other torsion coil spring serves to push down the push button. The push button switch according to claim 1, wherein the push button switch is configured to move from the arm distal end side to the arm proximal end side accordingly.

Images