JPS6124803B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a multi-rotation variable resistor.

The conventional screw-driven multi-rotation variable resistor shown in Fig. 1 allows fine adjustment of the resistance value, and has good stability after adjusting the resistance value.
It is often used for adjusting signal levels or setting thresholds in various electronic devices.

However, these multi-rotation type variable resistors have the disadvantage that the setting position of the slider for adjusting the resistance value is unclear and cannot be confirmed. In order to eliminate this drawback, we made the box-shaped insulator case (hereinafter referred to as the "case") of the variable resistor transparent so that the position of the internal slider can be visually confirmed from the outside. Variable resistors are also available on the market, but even in this type of variable resistor, a screwdriver is inserted into the adjustment hole on the panel surface of the device to adjust the resistance value. A drawback was that the slider setting position could not be confirmed from outside the device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a variable resistor that eliminates the drawbacks of the conventional multi-rotation variable resistor and allows the slider position to be easily determined.

That is, the variable resistor of the present invention includes a cylindrical screw that protrudes from an insulator case and has a driver groove at the tip, a recess in the case concentrically with the screw, and a space between the inner wall of the case recess and the screw. A cylindrical, spherical, etc. elastic body is press-fitted into the screwdriver, and as the screw having a driver groove rotates, this elastic body moves in the case recess, and the number of rotations is displayed based on the movement angle. do.

The present invention will be described in detail below with reference to the drawings.

2 and 3 are a perspective view and a front view of the vicinity of the screw head of a variable resistor according to an embodiment of the present invention, in which 1 is an insulating case, 2 is a cylindrical case for adjusting the slider, and FIG. The screw, 2a is the screw head with a driver groove, 2a is the case recess formed concentrically with the screw,
4 is a stopper portion formed on the case, 5 is a cylindrical elastic body press-fitted into the screw 2 and the inner wall of the case recess 3, and 6 is a scale formed on the case.

First, as shown in FIG. 2, on one end surface in the long side direction, there is a screw hole (not shown) formed so that the screw 2 can be inserted, a case recess 3 formed concentrically with the center of the screw hole, and The radius of the inner wall surface of the case recess 3 and the screw 2 are attached to the case 1 in which a stopper part 4 is formed by protruding a part of the inner wall surface of the case recess 3 into a mountain shape.
The screw 2 is inserted into the screw hole while pressing a cylindrical synthetic resin elastic body 5 having an outer diameter slightly larger than the difference between the radius and the inner wall of the case recess 3.

Thereafter, internal mechanical parts (not shown) are assembled from the bottom of the case 1 and sealed, thereby completing the variable resistor of the present invention.

Figure 3 shows the screw 2, case recess 3, and elastic body 5.
This shows the relationship between the configuration positions of the elastic body 5
The head 2a of the screw 2 is made larger than the diameter of the screw 2 to prevent it from falling out of the case recess 3. Further, if the outer edge of the case recess 3 is formed into a lid shape, it becomes even more difficult to fall off.

The stopper portions 4 indicate both ends of the variable range of the slider, and the scale 6 is formed to indicate the number of rotations of the screw 2.

Next, how to use the variable resistor of the present invention will be explained. When a screwdriver is inserted into the screwdriver groove of the screw head 2a and rotated clockwise, the elastic body 5 moves clockwise inside the case recess 3 while rotating counterclockwise. This reduction ratio, that is, the movement angle of the elastic body 5, is determined from the diameter of the inner wall of the case recess 3 and the diameter of the screw 2, in the same way as the method of determining the reduction ratio of a planetary gear.

As described above, according to the present invention, (i) the default setting position of the slider can be known from the position of the elastic body inserted between the screw and the case recess, making adjustment easy. ii) It has great practical value, such as being able to confirm the set position of the slider without removing the panel of the device.

It goes without saying that the present invention can also be applied to movable electronic components such as variable capacitors and variable coils that have variable parts.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional multi-rotation variable resistor.
2 and 3 are a perspective view and a front view of the vicinity of a threaded portion of a multi-rotation variable resistor according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Case, 2... Screw, 2a... Screw head, 3... Recessed part of case, 4... Stopper part of case, 5... Elastic body, 6... Scale.

Claims (1)

[Claims] 1. A box-shaped insulator with a resistor and a conductor inside, a screw that penetrates and pivots through the side of the insulator and protrudes to the outside of the insulator, and a screw that fits into the screw and connects the resistor. and a sliding block fixed to a slider that slides in pressure contact with a conductor, and the slider is moved by rotating the screw to vary the resistance value. A recess is provided in the insulator approximately concentrically with the screw, and an elastic body is press-fitted between the inner wall of the insulator recess and the cylindrical part of the screw, and as the screw having the driver groove rotates, the elastic body moves into the recess of the insulator. 1. A multi-rotation type variable resistor characterized by having a mechanism for moving the rotation speed and displaying the rotation speed by this movement.