JPS6320085Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a small variable resistor used for adjusting electronic circuits of various electronic devices.

Configuration of a conventional example and its problems First, a conventional small variable resistor will be explained with reference to the drawings.

As shown in FIG. 1, the mounting bracket 1 has a cylindrical part 1a in the center, and the tip of the cylindrical part 1a has two parts.
A piece of claw portion 1b is provided. The disc-shaped neutral terminal 2 has a central hole 2a into which the cylindrical portion 1a of the mounting bracket 1 is inserted, and an extraction electrode 2b bent downward.
and is provided. And molded resistor 3
is a resistor 3b with an external terminal 3a connected to its end,
It is molded with resin 3c, and has a central hole 3d in the center. The projection 1a of the mounting bracket 1 is inserted into the center hole 3d of the molded resistor 3 together with the center hole 2a of the middle terminal 2. A disk-shaped slider 4 is arranged on the molded resistor 3. The slider 4 has a rectangular square hole 4a in the center, and elastic contact portions 4b at the ends. The claw portion 1b of the mounting bracket 1 is inserted into the square hole 4a and bent. As a result, the mounting bracket 1
The inner terminal 2 and slider 4 are attached to the molded resistor 3, and the contact portion 4b of the slider 4 is connected to the resistor 3b.
Press against the surface of the In addition, the cap 5 is attached to the slider 4 in the case of an automatic adjustment or dust-proof type small variable resistor, and the cap 5 has a screw hole 5 on its top surface.
a is formed.

However, the above configuration has a problem in that the product price is high because the number of parts is large and the number of assembly steps is large.

Purpose of the invention In view of the above drawbacks, the present invention provides a small variable resistor that can reduce the number of parts and the number of assembly steps.

Structure of the invention In order to achieve the above object, the present invention includes a part of the resistor that is in pressure contact with the surface of the resistor molded with resin.
The slider has four protrusions arranged to form a cross-shaped groove in the center, and a central hole that holds the protrusions in a rotatable state. An inner terminal is provided which is fixed to the resin for molding the resistor, and the tips of the four protrusions are bulged outward from the center hole of the inner terminal.

The slider can be easily attached to the middle terminal by fitting the protrusion into the center hole of the middle terminal, and the slider can be assembled by fixing the middle terminal to the resin-molded resistor.
The number of parts is small, and the number of assembly steps can be reduced.

DESCRIPTION OF EMBODIMENTS A small variable resistor according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 2a and 2b, a resistor 6 used in a small variable resistor according to an embodiment of the present invention has a horse-shaped shape, and silver electrodes 7a and 7b are formed at both ends. . Outer terminals 8a and 8b are attached to the silver electrodes 7a and 7b with eyelets, etc., to establish electrical continuity.

The resistor 3 to which the external terminals 8a and 8b are attached is then molded with resin 9 to form a molded resistor 10.

A central hole 10a is provided in the center of the molded resistor 10.
are formed, and fixing protrusions 11a to 11d are formed on the upper surface.

As shown in FIGS. 3a and 3b, a stepped portion 12a is formed in the center of the middle terminal 12, and a central hole 12b is formed in the center.

Furthermore, fixing holes 13a to 1 are provided at the four corners of the middle terminal 12.
3d is formed. A lead electrode 12c is formed at one end of the middle terminal 12.

As shown in FIGS. 4a and 4b, the slider 14 includes:
Four protrusions 15a forming a cross-shaped groove in the center
~15d is formed. Projections 15a-15
d has elasticity due to the groove provided therebetween. Further, the upper portions of the projections 15a to 15d are slightly bulged outward from the center hole 12b of the inner terminal 12, and as shown in FIG.
5a to 15d are slid into the center hole 12b of the middle terminal 12, the slider 14 is held in the middle terminal 12 in a rotatable state. An elastic contact portion 14a is formed at the edge of the slider 14.

As shown in FIG. 6, in the molded resistor 10,
The middle terminal 12 is fixed by sandwiching the slider 14. Fixing protrusions 11a to 11d of the molded resistor 10 are inserted into the fixing holes 13a to 13d of the middle terminal 12, and the middle terminal 12 and the molded resistor 10 are fixed by heat welding, fastening, or the like.

The contact portion 14a of the slider 14 is pressed against the surface of the resistor 6. Further, protrusions 15a to 15d of the slider 14 protruding from the center hole 12b of the inner terminal 12.
Since the cross-shaped grooves are formed, the slider 14 can be freely rotated with a screwdriver or the like, and the resistance value can be adjusted. Furthermore, since the molded resistor 10 is also formed with a central hole 10a, a driver or the like can be inserted even from the side of the molded resistor 10, and the resistance value can be adjusted.

Note that two protrusions may be provided on the slider 14 so as to form a single-letter groove;
The four protrusions 15 of this embodiment are placed in the central hole 12b of the
A to 15d are easier to insert.

Effects of the Invention As described above, the present invention includes a slider having four protrusions that partially press against the surface of a resistor molded with resin and form a cross-shaped groove in the center; It has a central hole that holds the protrusion in a rotatable state, and a middle terminal that holds the slider and is fixed to the resin that molds the resistor. It can be rotated freely using a screwdriver etc. using the groove,
It can also be adjusted from the resistor side using a screwdriver or the like. In addition, the cap and mounting hardware that were required in the past are no longer required, and the upper part of the protruding part of the slider is slightly bulged outward from the center hole of the inner terminal, so it can be easily inserted into the center hole. After insertion, smooth rotation is also performed.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of a conventional small variable resistor.
Fig. 2a is a perspective view of a resistor constituting a small variable resistor according to an embodiment of the present invention, Fig. 2b is a perspective view of a resin molded resistor constituting the same resistor, and Figs. 3a and b 4a and 4b are perspective views and a Y-Y sectional view of the slider that constitutes the resistor, and FIG. 6 is a cross-sectional view of the case where a slider is attached to the middle terminal constituting the resistor, and FIG. 6 is an exploded perspective view of the resistor. 6...Resistor, 8a, 8b...Outer terminal, 9...
Resin, 12...Middle terminal, 12b...Central hole, 14
...Slider, 14a...Contact part, 15a to 15d
……protrusion.

Claims (1)

[Scope of utility model registration request] A resistor with an external terminal and molded with resin, and a slider having four protrusions that are partially pressed against the surface of the resistor and arranged in the center so as to form a cross-shaped groove between them. A slider and an intermediate terminal having a center hole for rotatably holding a protrusion of the slider and fixed to the molded resin of the resistor by sandwiching the slider, The tip of the protrusion on the piece is a small variable resistor that bulges outward from the center hole of the middle terminal.