JPS6046010A - Small-sized variable resistor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a small variable resistor, and particularly to making the small variable resistor smaller and thinner.

Conventional configuration and its problems The structure of a conventional small variable resistor will be explained with reference to FIG.

In the figure, 1 is a plastic cap with square holes 1b for attaching mounting brackets 2 on both sides of the rotation adjustment groove 1a.
have.

The mounting bracket 2 has a U-shape, and has a central hole 2a for engaging with an oval-shaped portion 9a of a metal shaft 9, which will be described later, and upright walls 2b on both sides thereof. A tapered lip 2C is integrally provided on the outer surface I/c, and is fitted into the camp 10 square hole 1b to prevent attachment and removal of the cap.

3 is a slider having a central hole 3a and an arm portion sbl, the central hole 3a is inserted into the oval-shaped portion 9a of the shaft 9, and the arm portion 3b is slid on a resistor element 6a to be described later with an appropriate pressure. 04 is a seat plate made of synthetic resin, and has a seat plate 4a in the center that is inserted into the cylindrical portion 9b of the shaft 9.

Reference numeral 6 denotes a resistor board made of a ceramic machine or the like, on which a horseshoe-shaped resistor element 5a is mounted, and a hole 5b in the center through which the cylindrical part 9b of the shaft 9 is inserted.
At the top, there is a silver terminal portion 5 connected to both ends of the resistor element 6a.
C is provided, and a terminal hole 6d is formed in the silver terminal portion 5C, and a notch 5 in which the stopper piece 7a of the intermediate terminal plate 7 is engaged is provided in the middle of the image terminal portion 5C.
e is formed. 6 is a mounting piece 6 integrally provided at the tip.
This is an external terminal that is attached to the lower surface of the resistor board 6 by inserting the terminal a into the terminal hole 5d formed in the silver terminal part 50 from below and touching its tip, etc., and connecting it with the external terminal 6C by soldering or Connected by conductive adhesive.

The middle terminal plate 7 has a hole 7 in its center through which the shaft 5 is inserted.
b, and one end thereof has the stopper piece 7a for engaging with a part of the stopper provided on the inner surface of the cap 1.
stands vertically, and a mounting leg 7c is integrally provided below the other end. 9 is a cylindrical part 9C which is a shaft made of metal and has a driver adjustment groove 9d below;
Above the middle terminal plate 7. Low resistance board 5 and seat plate 4
The cylindrical portion 9b is inserted into each central hole 7b, sb, 4b, and above the cylindrical portion 9b is the slider 3. Center hole 3 of mounting bracket 2
The above-mentioned oval shaped part 9a is integrally provided to be inserted through the shaft 9 and the outer terminal 6. Attached resistor board 5. The central holes 5b and 4a of the seat plate 4 are inserted into the cylindrical portion 9b. At this time, it goes without saying that the stopper piece 7a of the intermediate terminal plate 7 is engaged with the notch 5e of the resistor board.

Next, a slider 3 is attached to the oval shaped portion 9a of the shaft 9 protruding from the upper surface of the seat plate 4. The above-mentioned components are attached by inserting the medium heat holes 3a, 2a of the mounting bracket 2 and caulking the tip of the oval-shaped portion 9a protruding from the mounting bracket 2. Furthermore, the camp 1 is attached to the upright wall 2b of the mounting bracket 2 installed in this way.
The cap 1 is assembled by press-fitting the 0-square hole 1b and attaching the cap 1 with the tapered lip 2C by snapping.

On the other hand, as the automation of the Arananopuri process progresses in addition to the demand for smaller products, the rotation adjustment groove 1a of the cap portion is required to have a ten-shaped shape rather than the conventional one-shaped one. However, due to the limitations of the size of the product and the U-shaped dimensions of the mounting bracket 2, it is difficult to obtain the necessary lifespan rotation adjustment groove dimensions for automatic adjustment. The purpose of this invention is to provide a small variable resistor that has a rotation adjustment groove suitable for smaller products. In the small variable resistor of the invention, by providing a groove in the U-shaped upright wall of the supplementary bracket so that a screwdriver can be inserted, the restriction due to the U-shaped dimension μm is eliminated, and the rotation adjustment groove dimension necessary for automatic adjustment can be reduced. Description of Embodiment An embodiment of the present invention will be described below with reference to FIG. 2.

Reference numeral 10 has a ten-shaped rotation adjustment groove 10a made of plastic and a square hole 10b for attaching a mounting bracket 11.

The mounting bracket 11 is U-shaped, with a
It has a central hole 11a for engaging with the oval-shaped portion 9a of the metal shaft 9 shown in FIG. Furthermore, the central hole 11a has upright walls 11b on both sides, and tapered projections 11C are integrally provided at both ends thereof, and are snap-fitted into the square holes 1ob of the cap 1o to attach and remove the cap. is doing prevention. Furthermore, a notch 11d is provided approximately in the center of the upright wall 11b, and after the cap is attached, an adjustment groove is formed using a screwdriver or the like through the notch.The method for installing or assembling each component is the same as that shown in FIG. be. Incidentally, FIG. 4 shows a cross-sectional view of a small variable resistor according to an embodiment of the present invention, and the same numbers are used for the same parts as in FIG. 1 showing the conventional example.

Effects of the Invention As described above, the small variable resistor of the present invention allows the dimension Q2 of the rotation adjustment groove in the U-shaped bending direction of the mounting bracket to be larger, and it is possible to obtain a larger rotation adjustment groove dimension although it is small. can.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a conventional small variable resistor, Fig. 2 is a perspective view of a cap and mounting bracket in the small variable resistor of the present invention, and Fig. 3 is a cap and attachment of the small variable resistor of the present invention. FIG. 4 is a top view with metal fittings attached, and a sectional view of a small variable resistor according to an embodiment of the present invention. 1.10 Cap, 2.11 Mounting bracket, 3 Slider, 4 Seat plate, 6 Resistor board, 6...・Outer terminal, 7...Middle terminal,
9... Axis. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 0ct 3 Figure

Claims (1)

[Scope of Claims] A shaft made of a metal material is inserted through the center hole of the resistor board to which the outer terminal is attached, and a seat plate and a slider are inserted into the shaft that protrudes from the resistor board. and U-shaped mounting brackets in order, and the protruding tip of the shaft is caulked, etc., to the resistor board. The intermediate terminal board, the seat plate, the slider, and the mounting bracket are installed, a cap is attached to the installed mounting bracket, a notch is provided in a part of the mounting bracket, and after the cap is installed, the cap is inserted through the notch. A small variable resistor that forms the rotation adjustment groove of the cap.