JPS5840568Y2 - variable resistor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a variable resistor aimed at reducing component parts.

Figure 1 shows a conventional variable resistor, with an insulating dustproof cover 1
Insert the protruding part 1a protruding from the center into the cylindrical part 4a of the middle terminal 4, and insert the protruding part 1a protruding from the cylindrical part 4a.
The tip is rotatably attached with a caulking washer 5.

Reference numeral 3 denotes a resistor board in which the cylindrical portion 4a of the inner terminal 4 is inserted through a hole formed in the center thereof, and a horseshoe-shaped resistor (not shown) is provided on the upper surface side of the board 3 covered by the cover 1. The external terminals 6 and 6'(6' are not shown) are drawn out to the outside of the substrate 3, and are electrically connected to both ends of the resistor.

Reference numeral 7 denotes a spacer attached to the outer periphery of the cylindrical portion 4a of the middle terminal 4 so as to be located on the upper surface side of the board 3. etc., and the tip of the slider 2 is in contact with the resistor.

When the cover 1 covering the inside of the resistor is rotated, the tip of the slider 2 slides against the resistor, thereby adjusting the resistance value.

In this light-following example, the caulking washer 5 is required as a component for assembly, and since a caulking process is also required, large or small rotational torque defects may occur during the caulking process due to overcaulking or insufficient caulking. Was.

Furthermore, since the inner terminal 4 and the caulking washer 5 are made of the same metal material, there is a drawback that the plating peels off due to rotation.

The present invention has been devised to eliminate the above-mentioned drawbacks of the conventional art, and one embodiment thereof will be described below with reference to FIG. 2, with the same numbers assigned to the same parts as above.

As shown in FIG. 2, in the present invention, the cylindrical portion 4a of the inner terminal 4
A protrusion 1b and a recess 4b are formed on the protrusion 1a of the cover 1, and the cover 1 is attached to the inner terminal 4 by engaging the protrusion 1b and the recess 4b. It is.

Here, the relationship between the convex portion 1b and the concave portion 4b may be reversed.

The present invention is constructed in this way, and first of all, the caulking washer that was conventionally required can be omitted, and the caulking process associated with this can also be omitted.

Therefore, defects such as large or small rotational torque due to excessive or insufficient caulking will not occur, and the conventional drawbacks can be completely eliminated and the number of component parts and assembly man-hours can be reduced, and its practicality is great.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional variable resistor, and FIG. 2 is a sectional view of an embodiment of a variable resistor according to the present invention. 1...Insulating dustproof cover, 1a...Protrusion, 1b...Concave (convex), 4...
Middle terminal, 4a... Cylindrical part, 4b... Convex part (concave part).

Claims (1)

[Scope of utility model registration request] In a variable resistor in which the protruding part protruding from the center of an insulating dust-proof cover that covers the inside of the resistor is inserted into the cylindrical part of the middle terminal, and the resistance value is adjusted by rotating the cover,
A variable resistor comprising a concave portion formed in one of the protruding portion of the cover and a cylindrical portion of the intermediate terminal, and a convex portion formed in the other, and the cover is attached by engaging the concave portion and the convex portion.