JP2997081B2 - Electrical contacts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric contact used for a relay, a switch, and the like, and more particularly to a caulking contact capable of providing a large effective joint area with a spring material.

[0002]

2. Description of the Related Art As shown in FIG. 11, a conventional caulking contact is provided with a foot portion of a rivet contact 10 as shown in FIG. 13 made by header processing from a composite material 9 as shown in FIG. After the insertion, the foot was caulked and attached to the spring material 3. However, in the above-mentioned method, the adhesion between the rivet contact 10 and the spring material becomes a problem, and as shown in FIG. The material 3 was deformed, warped, or cracked. As a result, if the gap is left, the electrical resistance between the contact and the spring material will increase, and the heat dissipation to the spring material will be poor and the temperature will rise, so that welding will occur and the life will be shortened. It also led to fatal flaws.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has no gap with the spring material, and therefore has a large effective joint area with the spring material, and generates deformation or warpage of the spring material. An object of the present invention is to provide a reliable and long-lasting electrical contact that is stable and reliable with the opposing contact.

[0004]

The technical means of the present invention for solving the above-mentioned problems is characterized in that at least the foot portion of the rivet contact is brazed and caulked to a spring material.

[0005]

According to the electric contact of the present invention constructed as described above, at least the foot portion of the rivet contact is brazed and caulked to the spring material, so that the rivet contact and the spring material are surely joined widely. It can be joined by the area, there is no influence of the gap between the rivet contact and the spring material, and there is no firm caulking to prevent the gap, so cracks occur at the contacts and the spring material is deformed No warp or cracks occur.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment and a conventional example will be described below.

First, as shown in FIG. 2 as Example 1, material Ag, wire diameter 1.8 mm, length 1.5 mm and material A were cold-welded.
gCu28% / Cu, wire diameter 1.8mm, AgCu28% thickness 0.
02mm, length 2.3mm, material Ag, wire diameter 1.8mm, length 1.5mm
The composite material 1 was prepared by header processing, as shown in FIG. 3, a head diameter of 3.5 mm, a head thickness of 1.0 mm, a contact surface curvature of 8R, a head Ag thickness of 0.5 mm, a foot diameter of 2.0 mm, and a foot length of 2.0. The rivet contact 2 was mm. After that, the rivet contact is made of phosphor bronze and has a thickness of 0.08 mm and a spring material 3 with a width of 4 mm.
After inserting the foot of the rivet contact into the hole of mm, the foot was caulked and formed, and 100 electrical contacts 4 were obtained as shown in FIG.

As a second embodiment, as shown in FIG. 5, a material Ag, a wire diameter 1.8 mm, a length 1.5 mm and a material AgCu28
% / Cu, wire diameter 1.82mm, AgCu28% thickness 0.02mm, length 2.3mm composite material 1 'was prepared, and as shown in Fig. 6, head diameter 3.5mm, head thickness 1.0mm, contact surface 8R, head Ag thickness 0.5mm, foot diameter 2.0mm, foot length
The rivet contact 2 'was 0.8 mm. Thereafter, using the same spring material 3 as in the example, 100 electrical contacts 4 'were obtained in the same manner as shown in FIG.

On the other hand, as a conventional example, as shown in FIG. 12, material Ag, wire diameter 1.8 mm, length 1.5 mm and material C
u, wire diameter 1.8mm, length 2.3mm and material Ag, wire diameter 1.8mm,
A composite material 9 having a length of 1.5 mm was prepared, and a head diameter was 3.5 mm, a head thickness was 1.0 mm, a curvature of the contact surface was 8 R, a head Ag thickness was 0.5 mm, and a foot diameter was 2.0 mm as shown in FIG. , Foot length
The rivet contact 10 was 2.0 mm. Thereafter, using the same spring material 3 as in the embodiment, similarly, as shown in FIG.
I got ke. However, an evaluation test was carried out using 10 samples each, and the following results were obtained.

[0010]

[Table 1]

As an evaluation method, the crimping strength is a strength at which the rivet contact foot is compressed by a pin and broken. The temperature rise is 25A for electricity, opening / closing frequency 20 times / min, contact pressure 18-20g /
Contact temperature after switching 100,000 times under cm ² test condition. The electric resistance was measured with a milliohm meter between the spring material and the contact in the four-terminal method. 7 and 8 and FIG.
The same effect can be obtained in the rivet contact obtained as shown in FIG. 10 to FIG. 10, and the material, thickness and the like can be appropriately selected.

[0012]

As is apparent from the above results, according to the electric contact of the present invention, since the rivet contact is brazed and caulked at least at the foot of the rivet contact, the rivet contact and the spring material can be reliably formed. With a large joint area, without being affected by the gap between the rivet contact and the spring material.
In addition, since there is no firm caulking to prevent gaps, there is no crack in the contact, no deformation, warpage or crack in the spring material. It has an excellent effect that a stable and reliable long-life electrical contact can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of an electric contact of the present invention.

FIG. 2 is a perspective view showing a composite material for rivet contacts used in FIG. 1;

FIG. 3 is a sectional view showing a rivet contact used in FIG. 1;

FIG. 4 is a sectional view showing another embodiment of the electric contact of the present invention.

FIG. 5 is a perspective view showing a rivet contact composite material used in FIG. 4;

FIG. 6 is a sectional view showing a rivet contact used in FIG. 4;

FIG. 7 is a perspective view showing a composite material for a rivet contact used for the electric contact of the present invention.

FIG. 8 is a sectional view showing a rivet contact obtained from FIG. 7 used for the electric contact of the present invention.

FIG. 9 is a perspective view showing a rivet contact composite material used for the electric contact of the present invention.

FIG. 10 is a sectional view showing a rivet contact obtained from FIG. 9 used for the electric contact of the present invention.

FIG. 11 is a cross-sectional view showing a conventional electrical contact.

FIG. 12 is a sectional view showing a composite material for rivet contacts used in FIG. 11;

FIG. 13 is a sectional view showing a rivet contact used in FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Composite material 2 Riveted contact 3 Spring material 4 Contact

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 1/00 H01H 1/06 F16B 19/04-19/05 H01H 11/06

Claims (1)

(57) [Claims] 1. An electrical contact, characterized in that at least a foot of the rivet contact is brazed and caulked to a spring material.