JPH0750201A - Manufacture of brush piece for sliding - Google Patents

Abstract

PURPOSE:To solve a problem to say that one part of a wire is broken due to the degree of the linearity of each wire of wires, which are aligned and focussed, and a bending work of the contact parts of the points of the wires and the points are scatteringly dispersed and are made uneven easily. CONSTITUTION:Upper and lower side parts 2 of a continuum 1 formed by winding a wire material, which consists of a noble metal or a noble metal alloy, a plurality of times into a 8-shaped form are welded together and thereafter, the continuum is cut at its upper and lower end parts 3 to form as brush pieces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing sliding brush pieces used in trimmers, potentiometers and the like.

[0002]

2. Description of the Related Art Sliding brush pieces used for trimmers, potentiometers and the like, so-called multi-wire type brush pieces are, as shown in FIG. 3, a large number of sliding wire rods for increasing the reliability and stability of electrical contact. It is composed by. In this brush piece manufacturing method, a so-called bus bar in which a large number of sliding wires pre-aligned and bundled are arranged at regular intervals is welded, then cut, and the tip contact portion is bent into a semicircular shape to be formed. .

[0003]

According to such a conventional technique, since the strands are thin wires having a diameter of about 0.08 mm, the strands are aligned and focused, and the straightness of the strands and the bending of the tip contact portion cause the strands to bend. There is a problem that some of them tend to be broken or the tips are scattered and uneven.

[0004]

Therefore, according to the present invention, the upper and lower side portions of a continuous body formed by winding a wire made of a noble metal or a noble metal alloy into a figure 8 shape a plurality of times are cut at upper and lower ends. It is characterized by being a brush piece.

[0005]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a state in which a thin wire is wound, and FIG. 2 is a perspective view of a brush piece. A thin wire with a diameter of 0.08 mm made of 30 WT% Ag-40 WT% Pd-30 WT% Cu with a vertical dimension A of 5 mm and a horizontal dimension B
The continuous body 1 is formed by winding it into a shape of 8 having a width of 2 mm a plurality of times (6 times in this embodiment), and the upper and lower one side portions 2 of this continuous body are welded and then cut at the upper and lower end portions 3 to form an S-shape. Two brush pieces 4 of were obtained. If necessary, the base 6 on the side opposite to the tip contact part 5
May be formed into a linear shape.

The quality of 500 brush pieces thus obtained was inspected, and the results are shown in Table 1. At the same time, as a comparative example, six thin wires of 0.08 mm in diameter made of 30 WT% Ag-40 WT% Pd-30 WT% Cu similar to those in the above-described example were aligned and focused by the conventional technique, and the thickness was 0.2 mm and the width was 0.5 mm. , Length 1mm
The base portion 6 of the bus bar made of 80 WT% Cu-20 WT% Ni was welded and then cut, and the tip contact portion was bent into the same shape as in the above-mentioned embodiment.

[0007]

[Table 1] As is clear from Table 1, the brush pieces of the examples have no irregularities in the tips and the fine lines do not fall off, and are of stable quality.
On the other hand, the brush piece of the conventional example has a non-uniform tip and a fine wire is dropped off, and is of a quality having an unstable element.

[0008]

According to the present invention described in detail above,
After welding the upper and lower side parts of a continuous body formed by winding a wire made of a noble metal or a noble metal alloy a plurality of times in a figure-eight shape, and cutting it at the upper and lower ends into a brush piece, this brush piece has a tip contact portion. It has the effect of providing good quality with no variation and no loss of fine wires.

Further, since the dimensional accuracy is high and the number of manufacturing steps is small, it is possible to obtain a highly reliable brush piece.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a state in which a thin wire is wound according to an embodiment.

FIG. 2 is a perspective view of a brush piece.

FIG. 3 is a perspective view of a brush piece showing a conventional example.

[Explanation of sign]

 1 Continuum 2 Side 3 End 4 Brush Piece 5 Tip Contact 6 Base

Claims (1)

[Claims] 1. A brush piece is obtained by welding the upper and lower side portions of a continuous body formed by winding a wire made of a noble metal or a noble metal alloy into a plurality of eight times and then cutting the upper and lower end portions. A method for manufacturing a sliding brush piece.