JPH0322827Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention is a means for returning an actuating body such as a slide or a rotary body, which is incorporated into a switch, especially a small, light torque push switch, and a means for switching in contact with and away from a fixed terminal. This invention relates to the structure of a torsion coil spring that also serves as a movable contact.

[Background of the idea]

Conventionally, this type of torsion coil spring has a structure in which the movable contact moves a distance approximately equal to the distance traveled by the actuating body such as a slide or rotating body, and the contact with the contact surface of the fixed terminal is also a sliding contact. Therefore, as the contact area becomes larger, the transition range of the contact area also increases, resulting in heavier operating force, poor contact reliability, and shortened product life. There was a problem that the size had to be increased in order to secure the range.

[Purpose of invention]

The purpose of this invention is to solve the problems of the conventional technology described above, reduce the operating force, improve reliability, and extend the product life. The purpose of the present invention is to provide a torsion coil spring that also serves as a contact.

[Summary of the idea]

In order to achieve this object, the present invention is provided with a linear extension part at one end of the winding part, which is substantially orthogonal to the axial direction of the winding part, and from the tip of the extension part to the axis of the winding part. An actuating body receiving part bent in the direction is provided in the middle part thereof, and further, from the tip of the actuating body receiving part toward the winding part, it is bent at a certain angle and facing the extension part. The present invention is characterized in that the movable contact portion is provided with a movable contact portion, and the movable contact portion is clamped by the clamping contact portion of the clip.

[Example of idea]

Next, an example of implementation of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of a switch employing a torsion coil spring according to the present invention, and numeral 1 in the figure is the lower case. This lower case 1 is constructed by insert-molding fixed lead terminals 3a and 3b formed as a hoop material 2 shown in FIG. The fixed lead terminal 3a has a clip 4 that is folded back 180 degrees and then raised 90 degrees to stand upright.
As a result, the lower case 1 includes the fixed lead terminals 3a, 3b and the clip 4 from the beginning.

Further, reference numeral 5 in the figure indicates a torsion coil spring according to the present invention, and this torsion coil spring 5 is entirely plated with silver, and an axis line of the winding part 5a is attached to one end of the winding part 5a. A linear extension part 5b is formed which is substantially perpendicular to the direction, and an actuator receiving part 5c is formed which is bent from the tip of the extension part 5b in the axial direction of the winding part 5a to receive the pressing force of the slide described later. The winding portion 5 starts from the tip of the operating body receiving portion 5c.
A linear movable contact portion 5d is formed which is bent toward the direction a.
d has a constant angle α with the extension portion 5b.

Furthermore, 6 is a slide equipped with an engaging portion 6a that engages with the actuating body receiving portion 5c of this torsion coil spring 5, and this slide 6 has a tip protruding outwardly and upwardly from an upper case to be described later, and is different from a conventional lever. The torsion coil spring 5, which has a movable contact portion 5d that is activated by pressing the actuator receiving portion 5c by the slide 6, urges the slide 6 upward to return to its original position. It also serves as a return means for returning.

Further, 7 is an upper case that engages with the lower case 1 described above to form a switch casing, and this upper case 7 has a through hole 7a through which the tip of the slide 6 is inserted, and a hole 7a on the back side. A bulging portion 7b for holding down the torsion coil spring 5 is formed, and a groove 7c for guiding the torsion coil spring is further formed.

Now, if you push down the slide 6 from above,
As shown in FIGS. 3A to 3C, slide 6
The engaging portion 6a engages with the actuating body receiving portion 5c of the torsion coil spring 5 held in the guide groove 7c and pushes it down. As a result of this pushing down, the movable contact portion 5d is inserted into and held by the clamping contact portion 4a of the clip 4. At this time, since the movable contact portion 5d of the torsion coil spring 5 is configured to have an angle α with the extension portion 5b, even if the slide 6 is pushed down to the full stroke, the distance traveled by the slide 6 is
There is little movement in the position of the contact point of the clip 4 with the clamping contact part 4a, and therefore the clamping contact part 4a of the clip 4 moves less.
The area is supposed to be small.

[Effect of idea]

As mentioned above, according to the present invention, the movement of the contact point position is small compared to the moving distance of the actuating body, so the actuation force is reduced, reliability is improved, and the product life is extended. It is possible to downsize the switch that adopts this.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a switch employing a torsion coil spring according to the present invention, Fig. 2 is a perspective view of a hoop material into which the lower case is insert-molded, and Figs. 3A to 3C are longitudinal sections showing the same operating state. It is a diagram. 5... Torsion coil spring, 5a... Winding part, 5b
. . . extension portion, 5c . . . operating body receiving portion, 5d . . . movable contact portion.

Claims (1)

[Scope of utility model registration request] A lower case provided with a fixed lead terminal and a clip, a torsion coil spring held within the lower case and having a free end held by the clip, a slide for actuating the free end of the torsion coil spring, and the lower case. In the switch, the torsion coil spring has a linear extension part at one end of the winding part that is substantially orthogonal to the axial direction of the winding part, and the winding part extends from the tip of the extension part. an actuating body receiving part bent in the axial direction of the actuating body receiving part in the intermediate part thereof, further facing the extension part from the tip of the working body receiving part in the direction of the winding part, and having a certain angle. A torsion coil spring structure for a switch, characterized in that the movable contact part is bent and formed, and the movable contact part is clamped by a clamping contact part of the clip.