JP3820736B2 - 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]
Conventionally, as shown in FIG. 3, this type of pushbutton switch 1 has one end of a coil spring 3 that urges the pushbutton 2 as a movable contact 4, and this movable contact 4 projects against the inner peripheral wall surface of the switch body 5. The movable contact 4 and the fixed contact 7 are brought into sliding contact with the fixed contact 7 provided in the same plane as the surface of the projection 6 below the projection 6 while sliding on the projection 6 provided. Those which are electrically conductive are known.
[0003]
However, unlike torsion coil springs and compression coil springs, torsion coil springs are subject to torsional moments. To absorb energy with a single torsion coil spring, the spring wire diameter is increased, In addition, the coil inner diameter (coil effective diameter) must be increased, and there is a problem that the entire switch cannot be reduced in size.
[0004]
[Problems to be solved by the invention]
Therefore, as shown in FIG. 4, as the push button switch 1a, two torsion coil springs 8 and 9 are arranged in an L-shape, and the arm 8a and 8b on the force point side of these torsion coil springs 8 and 9 are superposed vertically. And, it is possible to assume that the intersection of these power point side arms 10 and 11 is pushed down from above by a push button (not shown) to reduce the load per spring. In addition, the switch becomes larger, and the torsional stroke of the arm on the power point side cannot be set longer, so that there is a problem that the operating force of the push button cannot be reduced to a certain light load.
[0005]
Therefore, a technical problem to be solved in order to provide a small pushbutton switch that can reduce the operation of the pushbutton arises, and the present invention aims to solve this problem.
[0006]
[Means for Solving the Problems]
The present invention has been proposed in order to achieve the above object, and a pair of torsion coil springs whose interference is restricted with each other are arranged in series on one side of a case body made of an insulating resin material. The arm of the power point side of each of the torsion coil springs extends along the coil winding direction to the other side of the case body, and the tip of the force point side arm of the one torsion coil spring can be raised and lowered to the upper part of the other side of the case body. Is elastically contacted from below with the pressing surface of the push button disposed on the other side, and the tip end portion of the force point side arm of the other torsion coil spring is between the tip end portion and the base end portion of the force point side arm of the one torsion coil spring. Further, it is elastically contacted from below toward the base end portion, a fixed contact that is always in contact with the one torsion coil spring is disposed on one side bottom surface of the case body, and the force point side arm of one torsion coil spring is disposed on the other side bottom surface. Due to the contact of There is provided a push button switch which is disposed to contact a fixed contact electrically conductive.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a partially cut oblique view showing the internal structure of the push button switch. In FIG. 1, the case main body 13 of the push button switch 12 is formed in a box shape whose upper surface is opened by an insulating resin material. The opening of the case body 13 is closed with a cover 14 made of a resin material to form a storage chamber 15 therein. The storage chamber 15 is divided into a left spring chamber 17 and a left spring chamber 18 by a partition wall 16 formed substantially at the center of one side of the case body 13, and one side surface 16 a of the partition wall 16 is provided in the right spring chamber 17. And a first torsion coil spring 21 interposed between the case body inner surface 20 and the case main body 20 that supports both ends thereof. The left spring chamber 19 includes the other side surface 16b of the partition wall 16 and the other side 16b. A second torsion coil spring 24 interposed between the opposing case body inner surface 23 and supporting both ends is disposed. The first and second torsion coil springs 21 and 24 are respectively engaged with recesses 25 and 26 formed by recessing one side bottom surface of the case body 13, and this engagement causes the front and rear, right and left to move. Movement is restricted.
[0008]
Further, the arms 27 and 28 on the force point side of the first torsion coil spring 21 and the second torsion coil spring 24 respectively extend from one side of the case body 13 to the other side along the coil winding direction. The arm 27 on the force point side of the torsion coil spring 21 is in elastic contact with the pressing surface 31 of the push button 30 provided so as to be movable up and down on the push button guide portion 29 provided on the other side of the cover 13 from below. An elastic force corresponding to the lowering is accumulated, and the arm 28 on the power point side of the second torsion coil spring 24 extends appropriately to the other side of the case body 13 and then the first torsion coil spring 21. The arm 27 on the power point side of the first torsion coil spring 21 is bent from the lower side of the arm 27 on the power point side, and the arm 27 on the power point side of the first torsion coil spring 21 is supported from below. Coil The twist of 24 are configured to share the load acting on the first coil torsion coil spring 21.
[0009]
Therefore, in this configuration, the support point X of the second torsion coil spring 24 with respect to the arm 27 on the force point side of the first torsion coil spring 21 can be made from the tip 33 side of the arm 27 on the force point side of the first torsion coil spring 21. It is desirable to reduce the operating force of the push button 28 as much as possible by setting it as close to the base end as possible.
[0010]
In this case, preferably, the height of the concave portion 25 engaging the second torsion coil spring 24 is set higher than the height of the concave portion 26 engaging the first torsion coil spring 21, and the first torsion coil spring is set. The contact point between the arm 27 on the force point side 21 and the arm 28 on the force point side of the second torsion coil spring 24, that is, the support point X is moved from the arm tip 33 side to the arm base 33 in response to the push button 30 being pushed down. If it is configured to move to the end side, the range that can be pushed down with a constant light load can be expanded, and the uncomfortable feeling of the push button operation due to a change in the pressing force can be eliminated.
[0011]
In such a configuration, as shown in FIG. 1, a first conductive plate 34 is inserted into one side bottom surface of the case body 13 so as to contact the first torsion coil spring 20, and further, a first side plate is placed on the other side bottom surface of the case body 13. The second conductive plate 35 is inserted so as to abut against the arm 27 on the force point side of the one torsion coil spring 21, and the tip end portion 33 of the arm 27 on the force point side of the first torsion coil spring 21 is abutted on the second conductive plate 35. When the push button 30 is pushed down, the first conductive plate 34 and the second conductive plate are simply brought into contact with the second conductive plate 35 with the tip 33 of the arm 27 on the power point side of the first torsion coil spring 21. 35 can be electrically connected to each other.
[0012]
Terminals (not shown) formed integrally with the first conductive plate 34 and the second conductive plate 35 protrude outward from the case body 13, and the push button guide portion 29 moves the push button 30 up and down. Both ends of the push button 30 are formed so as to be freely guided, and the lower part of the push button 30 is expanded radially outward so as to be restricted from coming out of the case body 13.
[0013]
Next, the operation of the push button switch according to the present embodiment will be described in detail with reference to FIGS.
1 and 2, when the push button 30 is pushed down, the arm 27 on the force point side of the first torsion coil spring 21 elastically contacting the pressing surface 31 of the push button 30 from below slides on one side surface 16 a of the partition wall 16. The moving guide surface is pushed down to the other bottom surface side of the case body 13, that is, the second conductive plate 34 side.
[0014]
When the push-down of the push button 30 proceeds and not only the first torsion coil spring 21 but also the second torsion coil spring 24 is twisted, the second torsion coil spring 24 against the arm 27 on the power point side of the first torsion coil spring 21 The support point X of the arm 28 on the force point side moves from the distal end 33 side of the arm 27 on the force point side of the first torsion coil spring 21 to the base end side. For this reason, the push button 28 can be pushed down with a fixed light load.
[0015]
When the push-down proceeds and the tip 33 of the arm 27 on the force point side of the first torsion coil spring 21 abuts on the second conductive plate 35 embedded in the other bottom surface of the case body 13, the first conductive plate 34 and the first conductive plate 34 The second conductive plate 35 is electrically connected to turn on the switch.
[0016]
Next, when the pressing force of the push button 30 is released, the first and second torsion coil springs 21 and 24 are restored by the elastic force stored when the push button 30 is pressed, and are respectively applied to both side surfaces 19 and 22 of the partition wall 16. Restore along.
[0017]
By restoring the torsional state, the arm 28 on the power point side of the second torsion coil spring 24 is detached from the second conductive plate 35 and the switch is turned off. Then, due to the restoring force of the first torsion coil spring 21, the push button 28 returns to the original position before being pushed.
[0018]
In the description of this embodiment, the partition wall 16 is formed integrally with the case body 13 to prevent short-circuiting between the torsion coil springs 21 and 24 and between the arms 27 and 28 on the power point side. Although it is configured to prevent interference, in order to prevent a short circuit, an insulating film may be formed on both side surfaces 19 and 22 of the partition wall 16 by coating or adhesion, respectively. What is necessary is just to adhere | attach the partition wall 16 with respect to the case main body 13, or to carry out integral molding in order to prevent deviation | shift.
[0019]
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.
[0020]
【The invention's effect】
As described in detail in the embodiment of the present invention, a pair of torsion coil springs whose interference is restricted are arranged in series on one side of the case body made of an insulating resin material, and the power points of these torsion coil springs The side arms are extended substantially along the coil winding direction to the other side of the case body, and the tip of the force side arm of the one torsion coil spring is arranged to be freely raised and lowered on the other upper side of the case body. Elastically contact the pressing surface of the provided push button from below, and connect the tip end of the force point side arm of the other torsion coil spring between the tip end portion and the base end portion of the force point side arm of the one torsion coil spring. Since it is configured to be elastically contacted to the end side from below, it is possible to provide both a downsizing of the spring and an expansion of the torsion stroke, and a small push button switch that is light in button operation. And if it comprises so that the power point side arm of each torsion coil spring may be extended in a coil winding direction, the workability can be improved significantly and the outstanding effect that a significant cost reduction can be achieved will be exhibited.
[Brief description of the drawings]
FIG. 1 is a partially cut perspective view of a pushbutton switch according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a change in torsional state of a torsion coil spring according to the present invention.
3A and 3B are diagrams showing a conventional pushbutton switch, in which FIG. 3A is a plan view, and FIG. 3B is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a plan view showing a conventional push button switch.
[Explanation of symbols]
13 Case body 30 Push button 16 Partition wall 21 First torsion coil spring (one torsion coil spring)
24 Second torsion coil spring (the other torsion coil spring)
27 Arm on the force point side of the first torsion coil spring 28 Arm 30 on the force point side of the second torsion coil spring Push button 31 Pressing surface 33 End portion 34 on the force point side of the first torsion coil spring First conductive plate (fixed contact) )
35 Second conductive plate (fixed contact)
X Support point (contact point)

Claims (1)

A pair of torsion coil springs whose interference with each other is regulated is arranged in series on one side of the case body made of an insulating resin material, and the force point side arms of these torsion coil springs are respectively substantially along the coil winding direction. Extending to the other side of the main body, the tip of the force point side arm of the one torsion coil spring is brought into elastic contact with the pressing surface of the push button disposed on the other side upper part of the case main body from below, The distal end portion of the force point side arm of the other torsion coil spring is elastically contacted from below between the distal end portion and the proximal end portion of the force point side arm of the one torsion coil spring and close to the proximal end portion. A fixed contact that is constantly in contact with the one torsion coil spring is disposed on the bottom surface of one side, and a fixed contact that is electrically connected to the fixed contact by the contact of the force point side arm of the one torsion coil spring is disposed on the bottom surface of the other side. It is characterized by being arranged Push-button switch that.

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