JPH05242752A - Electric contact - Google Patents

Abstract

PURPOSE:To increase the organic contact area with a spring member so as to eliminate a deformation or a warp, to stabilize the contact, and to realize a long service life with a high reliability, by soldering a rivet contact to the spring member at least at the foot of the contact, and calking it. CONSTITUTION:Since a rivet contact 2 is soldered to a spring member 3 at least at the foot of the contact 2, and calked, the contact 2 and the member 3 can be connected securely in a wide contact area. As a result, no influence of the interval between the contact 2 and the member 3 is generated, and a clearance is prevented. Thereby, it is not necessary to calk solidly, and the generation of a crack to the contact 2, or a deformation, a warp, and a crack to the member 3 are eliminated. Consequently, a contact with an opposing contact is stabilized, the reliability is increased, and a long service life is realized.

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 taking a large effective joint area with a spring material.

[0002]

2. Description of the Related Art A conventional caulking contact has a rivet contact 10 having a foot portion formed in a hole portion of a spring material 3 as shown in FIG. 12 by header processing from a composite material 9 as shown in FIG. After the insertion, the foot portion was caulked and attached to the spring member 3. However, in the above method, the adhesion between the rivet contact 10 and the spring material becomes a problem, and as shown in FIG. 11, a crevice is generated in the rivet contact 10 if there is a gap or if it is caulked firmly to prevent it, the spring The material 3 was deformed or warped or cracked. As a result, if the gap remains open, the electrical resistance between the contact and the spring material will become high, and the heat dissipation to the spring material will be poor and the temperature will rise, causing welding etc. and shortening the service life. It was also linked to a fatal defect.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has no gap with the spring member, and therefore has a large effective joint area with the spring member and causes deformation or warpage in the spring member. It is intended to provide a reliable and long-life electrical contact that is stable in contact with a counter contact without being caused.

[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 crimped to the spring material.

[0005]

According to the electric contact of the present invention constructed as described above, since the spring material is brazed and caulked at least at the foot portion of the rivet contact, the rivet contact and the spring material can be securely joined to each other in a wide range. It is possible to join in the area, there is no effect of the gap between the rivet contact and the spring material, and there is no caulking firmly to prevent the gap, so the contact will crack or the spring material will be deformed. It does not cause sledges or cracks.

[0006]

EXAMPLES Examples and conventional examples will be described below.

First, as shown in FIG. 2 as Example 1, the material Ag, the wire diameter 1.8 mm, the length 1.5 mm and the material A were obtained by cold pressure welding.
gCu28% / Cu, wire diameter 1.8mm, AgCu28% thickness 0.
02mm, length 2.3mm and material Ag, wire diameter 1.8mm, length 1.5mm
As shown in Fig. 3, the composite material 1 of No. 1 was created, and the head diameter was 3.5 mm, the head thickness was 1.0 mm, the contact surface curvature was 8R, the head Ag thickness was 0.5 mm, the foot diameter was 2.0 mm, and the foot length was 2.0. mm rivet contact 2 was used. After that, the rivet contact is made of phosphor bronze and has a thickness of 0.08 mm and a width of 4 mm and a diameter of 2.02.
The foot portion of the rivet contact was inserted into the hole of mm, the foot portion was caulked and molded, and further 100 pieces of the electric contact 4 were obtained by electric current brazing as shown in FIG.

As a second embodiment, as shown in FIG. 5, by cold pressure welding, material Ag, wire diameter 1.8 mm, length 1.5 mm and material AgCu28
% / Cu, wire diameter 1.82mm, AgCu 28% thickness 0.02mm, length 2.3mm composite material 1'is created, and by header processing, as shown in Fig. 6, head diameter 3.5mm, head thickness 1.0mm, contact surface Curvature of 8R, thickness of head Ag 0.5mm, foot diameter 2.0mm, foot length
A rivet contact 2'of 0.8 mm was used. Thereafter, using the same spring material 3 as in the example, 100 electrical contacts 4'as shown in FIG. 4 were obtained in the same manner.

On the other hand, as shown in FIG. 12 as a conventional example, the material Ag, the wire diameter 1.8 mm, the length 1.5 mm and the material C are obtained by cold pressure welding.
u, wire diameter 1.8mm, length 2.3mm and material Ag, wire diameter 1.8mm,
As shown in Fig. 13, a composite material 9 with a length of 1.5 mm was created, and as shown in Fig. 13, head diameter 3.5 mm, head thickness 1.0 mm, contact surface curvature 8R, head Ag thickness 0.5 mm, foot diameter 2.0 mm. , Foot length
A rivet contact 10 of 2.0 mm was used. After that, the same spring material 3 as that of the embodiment is used, and similarly, as shown in FIG.
I got a ke Then, an evaluation test was conducted using 10 pieces each, and the following results were obtained.

[0010]

[Table 1]

As an evaluation method, the caulking strength is the strength at which the rivet contact foot portion is compressed by a pin to break it. Temperature rise is 25 A for energization, 20 times / minute for switching frequency, and 18-20 g / contact pressure.
Contact temperature after opening and closing 100,000 times under the test condition of cm ² . As the electric resistance, the electric resistance between the spring material and the contact in the four-terminal method was measured with a milliohm meter. 7 to 8 and 9
The same effect can be obtained with the rivet contact obtained as shown in FIG. 10, and the material, thickness, etc. can be appropriately selected.

[0012]

As is clear from the above results, according to the electric contact of the present invention, 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 securely connected. Can be joined with a wide joining area, and there is no effect of the gap between the rivet contact and the spring material,
In addition, since it does not need to be caulked firmly to prevent a gap, it does not cause cracks in the contacts or deformation, warpage or cracks in the spring material. It has an excellent effect that a stable, highly reliable and long-life electrical contact can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an 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.

FIG. 3 is a cross-sectional view showing a rivet contact used in FIG.

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

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

FIG. 6 is a cross-sectional view showing a rivet contact used in FIG.

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

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

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

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

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

12 is a cross-sectional view showing a composite material for a rivet contact used in FIG. 11.

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

[Explanation of symbols]

 1 composite material 2 rivet contact 3 spring material 4 contact

Claims (1)

[Claims] 1. An electrical contact characterized in that at least a foot portion of a rivet contact is brazed and crimped to a spring material.