JPS5810321Y2 - rotary variable resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary variable resistor, and particularly to improvements in a small rotary variable resistor suitable for semi-fixed variable resistors and the like.

Hereinafter, the present invention will be explained in detail according to an embodiment shown in FIGS. 1 to 3.

In the figure, 1 is a substrate made of an insulating material on which a horseshoe-shaped resistor 6 is formed, and 4 and 4 are terminals that are penetrated and fixed to the substrate 1 and are connected to the ends of the resistor 6 on a conductive part 7. It has a head 4a located at .

Reference numeral 3 denotes an intermediate terminal attached to the center of the substrate 1 by penetrating therethrough, and the head of the intermediate terminal 3 is integrally formed as a substantially conical contact portion 3a as shown in the figure.

The terminal 4 and the intermediate terminal 3 each have a leg portion 4b,
3b is attached to the lower surface of the board 1 by tightening.

Reference numeral 2 denotes a cylindrical cover made of insulating material, and the cover has a locking leg 2a provided at the lower end of its side wall, which is rotatably attached to the resistance board 1 by a so-called snap-in mechanism. The cover 2 is driven by engaging a screwdriver or the like with the rectangular drive groove 2b.

Reference numeral 5 denotes a slider made of a single elastic thin metal plate having a substantially cone-shaped disk portion 5b, and as shown most clearly in FIG. The wing portions 5 f and 5 f are integrally formed with a pair of substantially semi-arc shaped contact portions 5 a and 5 a ′ that are continuous with the wing portions and are bent downward, and the respective contact portions 5 a and 5 a are formed integrally with each other. Contact points 5h and 5h' are provided at the center of '.

The slider 5 has a hole 5d formed in the center of the disc part 5b, and is rotatably held in elastic contact with the contact part 3a of the intermediate terminal 3. As shown in the figure, it is brought into pressure contact with the inner surface of the cover 2, and the hole 5 of the wing portion 5f is
e into the protrusion (not shown) of the cover 2, and
It is held within the cover 2 in a state where it can rotate together with the cover 2.

The slider 5 is always given downward elasticity by the cover 2, and the disk portion 5b is configured to reliably engage the contact portion 3a to obtain good electrical continuity. .

In this embodiment, in order to rotate the slider 5 integrally with the cover 2, the hole 5e and the protrusion are engaged with each other.
, 5 for integral rotation, but only elastic contact (frictional engagement) between the cover 2 and the slider 5 causes the cover 2 to rotate in unison.
In some cases, the slider 5 and the slider 5 may be configured to rotate together.

Moreover, what is shown in FIG. 4 is another embodiment of the present invention. In this case, the contact portion 3 of the intermediate terminal 3 is placed in the center of the disc portion 5b.
A hollow conical recess 5g corresponding to a is formed, and the recess 5
Although the contact portion 3a is inserted into the inside of the contact portion 3a, the principle and effects thereof are the same as those of the previous embodiment.

As mentioned above, the variable resistor of the present invention has only a board with terminals embedded therein, a cover, and a slider, and has an extremely small number of parts and is easy to assemble.
It is inexpensive and compact.

In addition, since the center of the substantially forest-shaped disk portion of the slider is always in elastic contact with the conical contact portion of the intermediate terminal, the contact stability between the slider and the intermediate terminal is extremely good. .

In addition, since the slider is pressed and clamped between the substrate and the cover, its operation is stable and the contact stability is high even when subjected to vibrations or shocks.

Overall, it is possible to provide a small rotary variable resistor that is compact, has good assembly workability, and has high contact reliability, and is suitable for use in semi-fixed variable resistors and the like.

[Brief explanation of the drawing]

1 to 3 relate to an embodiment of the present invention, in which FIG. 1 is a side sectional view, FIG. 2 is a plan view with the cover removed, and FIG. 3 is a perspective view showing the slider. FIG. 4 is a sectional view of a main part showing another embodiment of the present invention. 1... Board, 2... Cover, 3...
...Intermediate terminal, 3a...Contact part, 4...
...terminal, 5...slider, 5a...contact part, 5b...disc part, 5C...peripheral end of disc part, 5d ...hole, 5g ... recess, 6 ... resistor.

Claims (1)

[Scope of utility model registration request] An intermediate terminal integrally formed with a conical contact portion is protruded from the center of a substrate on which a horseshoe-shaped resistor is formed, and a cover made of an insulating material is rotatably attached to the substrate, while,
A slider made of an elastic thin metal plate is provided with a generally mortar-shaped disk portion and a contact portion connected to the disk portion, and the circumferential edge of the upper portion of the disk portion is pressed against the inner surface of the cover. A hole or a recess provided in the center of the lower part is rotatably held in elastic contact with the contact part of the intermediate terminal, so that the cover and the slider can be rotated integrally with respect to the substrate, and by rotation of the cover. A rotary variable resistor, characterized in that a contact portion of the slider is configured to come into sliding contact with the resistor.