JPH076708U - Potentiometer - Google Patents

Abstract

(57) [Summary] [Purpose] The brush can be easily assembled without damage. A potentiometer including a ring-shaped resistor assembly 1 and a brush assembly 2 is provided with a relief recess 11 for a brush 6. The brush assembly 1 has a resistor 4 and a conductor 5 in a part of the inner diameter surface in the circumferential direction. The brush assembly 2 has two brushes 6 elastically in contact with the resistor 4 and the conductor 5, mounted on a brush base 7, and the brush base 7 mounted on an input shaft 8. The input shaft 8 is rotatably supported by a bearing 10 in a concentric position with the resistor assembly 1. The escape recess 11 is provided in the circumferential portion of the resistor assembly 1 where the resistor 4 and the conductor 5 are absent, at a depth such that the brush 6 does not interfere in the naturally extended state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a rotary potentiometer.

[0002]

[Prior art]

 Conventionally, the rotary potentiometers shown in FIGS. 2 and 3 have been used. This potentiometer includes a resistor assembly 50 having a resistor 52 and a conductor 53 provided on the inner diameter surface of a resin ring 51, and a brush assembly 57 having a brush base 55 having two brushes 54 fixed to an input shaft 56. Composed of. The input shaft 56 is rotatably supported outside the resin ring 51 by a bearing (not shown) concentrically with the resin ring 51. As the input shaft 56 rotates, each brush brush 54 is placed on the resistor 52 and the conductor 53. Slide.

The brush 54 needs to reliably contact the resistor 52 and the conductor 53 even when the input shaft 56 is displaced or vibrated. Therefore, the brush 54 is made of an elastic material such as a leaf spring and is designed to bend as shown by the solid line in FIG. 3 in the contact state with the resistor 52 and the conductor 53, and to exert a certain contact pressure. That is, as the brush 54, a brush which is naturally in an expanded state shown by a broken line in the figure is used.

Therefore, in order to assemble the brush assembly 57 into the axial resistor assembly 50 in the axial direction as shown by the arrow in FIG. 2, the brush 54 is assembled as shown in FIG. After the brush 54 is placed in the resin ring 51 in a state of being largely bent as shown by the chain line and the brush 54 is positioned on the resistor 52 and the conductor 53, the tip of the brush 54 and the resistor 52 and the conductor 53 are separated from each other. Gently release the deflection of the brush 54 so that it makes contact.

[0005]

[Problems to be solved by the device]

 However, in the case of assembling in this way, if the amount of deflection of the brush 54 is small, the brush 54 may come into contact with and damage the resistor 52 and the conductor 53, and therefore the brush 54 must be largely bent as shown in the drawing. Therefore, there is a possibility that the brush 54 may be damaged in the course of this bending, and if the brush 54 is damaged, adverse effects such as inaccurate output signal with respect to the rotation angle may be considered. In addition, it is necessary to bend the brush 54 to assemble it, which is troublesome.

An object of the present invention is to provide a potentiometer that can be easily assembled without damaging the brush.

[0007]

[Means for Solving the Problems]

 The potentiometer of the present invention comprises a ring-shaped resistor assembly having a resistor and a conductor in a part of the inner diameter surface in the circumferential direction, and a resistor assembly rotatably provided concentrically with the resistor assembly. And a brush assembly having a plurality of brushes each elastically contacting the conductor. In the potentiometer having this structure, a relief recess having a depth that does not interfere with each brush in a naturally extended state is provided in a circumferential portion on the inner diameter surface of the ring-shaped resistor assembly where there is no resistor or conductor.

[0008]

[Action]

 When the brush assembly is installed on the inner diameter side of the resistor assembly, the brush tip is installed at a rotation angle that matches the relief recess. Then rotate the brush assembly to the angle at which the brush contacts the resistor and conductor. This causes the brush to flex normally and provide the required contact pressure.

[0009]

【Example】

 An embodiment of this invention will be described with reference to FIG. This potentiometer is composed of a ring-shaped resistor assembly 1 and a brush assembly 2. The resistor assembly 1 includes a resistor 4 and a conductor 5 arranged in the axial direction in a circumferential range of a part of the inner diameter surface of the resin ring 3. The brush assembly 2 comprises a brush base 7 having two brushes 6 in contact with a resistor 4 and a conductor 5, respectively, fixed to an input shaft 8. The brush 6 is made of an elastic body such as a metal leaf spring, and has a length that makes pressure contact with the resistor 4 and the conductor 5 in a flexed state. The input shaft 8 is rotatably supported by an exterior case 9 accommodating the resin ring 3 via two bearings 10 and arranged concentrically with the resin ring 3.

In the potentiometer having such a basic structure, as shown in FIG. 1 (B), a relief recess 11 is provided in the inner peripheral surface of the resin ring 3 where the resistor 4 and the conductor 5 are absent. The escape recess 11 has a depth that does not interfere with each brush 6 even when the brush 6 is fully extended. The relief recess 11 has an arcuate groove shape extending in the axial direction of the resin ring 3, and both side edges 11a have a smooth curved surface and a cross-sectional shape continuing from the inner diameter surface of the resin ring 3.

The potentiometer is assembled as follows. When the brush assembly 2 is inserted into the resistor assembly 1 on the inner diameter side in the axial direction and incorporated, the rotation angle at which the tip of the brush 6 coincides with the relief recess 11 as shown by the solid line in FIG. 1 (B). And then incorporate. After that, the brush assembly part 2 is rotated to an angle at which the brush 6 contacts the resistor 4 and the conductor 5. As a result, the brush 6 normally bends as shown by the chain line in the figure to obtain the necessary contact pressure.

In this way, both assembly parts 1 and 2 can be assembled together without bending the brush 6. Therefore, the brush 6 can be assembled without damaging it, and the work of holding the brush 6 in a bent state at the time of assembling is unnecessary, and the brush 6 can be easily assembled.

[0013]

[Effect of device]

 The potentiometer of the present invention has a relief recess in the ring-shaped resistor assembly, which has a depth that does not interfere with each brush in its natural extension state, in the circumferential portion where there is no resistor or conductor. Both assemblies can be assembled together. Therefore, it is possible to easily install the brush without damaging it.

[Brief description of drawings]

FIG. 1A is a partially cutaway perspective view of an embodiment of the present invention, and FIG. 1B is a bottom view of the same.

FIG. 2 is an explanatory view of a conventional assembly process.

FIG. 3 is a bottom view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Resistor assembly part, 2 ... Brush assembly part, 3 ... Resin ring, 4 ... Resistor, 5 ... Conductor, 6 ... Brush, 7 ... Brush base, 8 ... Input shaft, 10 ... Bearing, 11 ... Relief recessed part

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped resistor assembly having a resistor and a conductor in a part of the inner diameter surface in the circumferential direction, and a resistor and a conductor rotatably provided concentrically with the resistor assembly. In a potentiometer provided with a brush assembly having a brush that elastically contacts, each of the brushes interferes in a circumferential direction portion on the inner diameter surface of the ring-shaped resistor assembly where the resistor and the conductor are absent in a naturally extended state. A potentiometer characterized by a relief recess with a depth that does not occur.