JPS6225842Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable resistor, and particularly relates to an improvement of a minute variable resistor in which the diameter of the resistor substrate forming the resistor is about 5 mm.

Generally, in this type of minute variable resistor,
As the component parts become smaller, there are various problems such as mounting the terminal and reinforcing it, mounting the slider and its driving method and regulations, and positioning means when assembling the parts.

In view of the above-mentioned drawbacks, the present invention has been devised to solve these problems, and provides a variable resistor that is easy to assemble and has excellent mechanical strength.

Next, one embodiment of the present invention will be described in detail using FIGS. 1 to 5.

In the figure, reference numeral 1 denotes an octagonal prism-shaped insulating base, which is made of synthetic resin and has a cylindrical spacer portion 2 integrally formed in the center of its upper surface. A ceramic resistance board 3 is fitted into this spacer part 2 and placed on the insulating base 1 for protection.
Terminal silver electrodes 3b, 3b are provided on both edges of a. In addition, a through hole is formed in the spacer portion 2, and a metal support shaft 4 is inserted through the hole, and the tip of the metal support shaft 4 is caulked and a synthetic resin insulating cover 5 is inserted.
is fixedly installed, and a slider 6 that slides on the resistor 3a to vary the resistance value is held under the insulating cover 5 and is similarly rotated as the insulating cover 5 rotates. A cross-shaped drive groove 7 is formed on the upper surface of the insulating cover 5, and a jig such as a screwdriver is applied to the drive groove 7 to rotate the insulating cover 5. A triangular display positioning recess 8 is formed at one end of the drive groove 7, and a circular hole 7a is formed at the intersection of the drive grooves 7, and the tip of the metal support shaft 4 is inserted into the bottom 9 of the circular hole 7a. Through hole 7b
is drilled.

On the other hand, the slider 6 has an arcuate piece 1 bent slightly downward.
0 is formed, and a contact 11 that presses against the resistance board 3 is bent and formed on this arc-shaped piece 10. Also,
A fan-shaped notch 13 is formed in the central plate portion 12 of the slider 6, and an insulating cover 5 is formed in this notch 13.
The slider 6 is rotated integrally with the rotation of the insulating cover 5 by engaging a protrusion 14 extending downwardly from the lower surface of the slider 6 .

Further, a fan-shaped convex stepped portion 15 is formed on the circumferential surface of the cylindrical spacer portion 2, and the side surfaces of the extending protrusion 14 of the insulating cover 5 come into contact with both end surfaces of the convex stepped portion 15. Therefore, the rotation angle of the insulating cover 5 is regulated.

The insulating base 1 and the resistance board 3 have first and third terminals 1.
6 and 17 are implanted through the first and third terminals 1.
The upper ends of 6 and 17 are protruded to form terminal silver electrodes 3b and 3b.
are soldered to each. The first and third terminals 16 and 17 are provided with reinforcing ribs 18 having an arcuate cross section in the longitudinal direction. Further, a recess 19 is formed in the lower surface of the insulating base 1, and an L-shaped second terminal 20 is held between the insulating base 1 and the flange portion 21 of the metal support shaft 4. It is electrically connected to the slider 6 by 4. This second terminal 2
0, the mounting piece 22 is formed to match the shape of the recess 19 and is prevented from rotating together with the metal support shaft 4.

Note that 23 is a drive groove provided in the metal support shaft 4.

The present invention is constructed as described above, and the first and third terminals are implanted through the insulating base and the resistance board, so both terminals are reinforced, and at the same time, the ceramic resistance board, which is fragile against pressing force, is protected. It is something to do.
Furthermore, the second terminal can be easily attached and can be prevented from rotating around the metal support shaft. Furthermore, a through hole is provided at the intersection bottom of the cross-shaped drive groove of the insulating cover, and the upper tip of the metal support shaft is caulked at the intersection bottom, so that a structure can be created that does not cause any problems in driving. In addition, since the metal support shaft has a drive groove at the bottom, it can be driven from both the front and back sides in combination with the cross-shaped drive groove on the top surface of the insulating cover. Since it has a structure in which component parts such as the resistor board, slider, and insulating cover are sandwiched, it can be easily assembled and the work efficiency is high.

According to the present invention, it is possible to provide a variable resistor that is compact as a whole, can be driven from both the front and back sides, and has excellent mechanical strength.

[Brief explanation of the drawing]

Each of the drawings shows one embodiment of the present invention, with Fig. 1 being a longitudinal sectional view, Fig. 2 being a plan view, and Fig. 3 being a bottom view.
FIG. 4 is a plan view with the insulating cover and slider removed, and FIG. 5 is a plan view of the slider. 1... Insulating base, 2... Cylindrical spacer part, 3
...Resistor board, 3a...Resistor, 4...Metal support shaft, 5...Insulating cover, 6...Slider, 7...Cross-shaped drive groove, 7b...Through hole, 8...For positioning Recess, 9...Cross bottom, 13...Notch, 14...
Projection, 15... Convex stepped portion, 16... First terminal, 17
... third terminal, 19 ... recess, 20 ... second terminal, 21 ... flange section.

Claims (1)

[Scope of utility model registration request] an insulating base integrally formed with a cylindrical spacer portion having a convex stepped portion on the circumferential surface in the center of the upper surface; a resistor substrate having a resistor disposed on the insulating base;
A slider that slides on the resistor and has a cutout in the center plate, an insulating cover placed on top of the slider, and a cross-shaped slider formed on the top surface of the insulating cover. A drive groove with a through hole at the bottom of the intersection,
a metal support shaft that is inserted through the cylindrical spacer portion to sandwich the slider and is caulked and fixed to the insulating cover at the cross bottom portion of the insulating cover; a drive groove provided at the lower part of the metal support shaft; a protrusion provided on the lower surface of the insulating cover that engages with the notch of the slider and abuts the end face of the convex step to restrict rotation of the insulating cover; A variable resistor comprising first and third terminals implanted through the insulating base and a second terminal interposed between the lower surface of the insulating base and the flange portion of the metal support shaft.