JPH05282955A - Contact terminal - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention provides a contact terminal which has a strong fixing strength, is stable, has a small number of steps, and has good productivity, and is suitable for mass production by automation. [Structure] A rivet-shaped contact foot portion is tightly fitted to one end of a cylindrical body formed by bending a plate material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in contact terminals used in electric appliances and the like.

[0002]

2. Description of the Related Art Conventionally, as the contact terminal, for example, as shown in FIGS. 10a, 10b and 10c, a bar-shaped body having a contact 12 for contact at one end and a processing portion 13 for connection at the other end was there. The contact for contact was formed by fixing it to one end of the rod by electrical resistance welding.However, when processing the rod with a header or the like, there is a shear mark on the surface or around the one end of the rod. There is a problem that the welding strength after electric resistance welding is unstable and varies due to the occurrence of residuals such as machining distortion and burrs, which makes the man-hours complicated due to barrel polishing and heat treatment after header forming and manual processing. However, it has been an obstacle to mass production due to automation.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a contact terminal which has a strong fixing strength, is stable, has a small number of steps, and has good productivity, and is suitable for mass production by automation. is there.

[0004]

A contact terminal according to the present invention for solving the above-mentioned problems is characterized in that a rivet-shaped contact foot portion is tightly fitted to one end portion of a cylindrical body formed by bending a plate material. To do.

[0005]

According to the contact terminal of the present invention constructed as described above, since the plate material is formed into a cylindrical body by bending, the number of steps is small and the productivity is good. The progressive die processing facilitates automation and is suitable for mass production. Further, since the rivet-shaped contact foot portion is tightly fitted to the cylindrical body, it is a high-quality contact terminal which has a strong fixing strength, is stable, and is highly reliable. Further, the end of the cylindrical body may be press-molded to form a hole, a hole may be formed in the end to prevent the boss from coming off, and a convex or concave portion may be provided on the inner surface of the end of the cylindrical body to form a rivet-shaped contact. It becomes more firmly fixed by pushing in the legs. Further, the rivet-shaped contact foot portion is not limited to being press-fitted into one end of the cylindrical body, and the foot portion of the rivet-shaped contact may be wrapped and tightly fitted when the plate material is bent to form a cylindrical body. It is designed according to the layout of.

[0006]

EXAMPLES Examples and conventional examples will be described below. First, as shown in Fig. 1, the depth is 0.8mm and 1.2mm from the end.
As shown in Fig. 2, one end of a strip material 2 made of brass with a thickness of 0.8 mm and a groove 1 having a width of 0.1 mm and a width of 0.2 mm has an outer diameter of 4.3 m.
A cylinder 3 with an inner diameter of 2.7 mm and an inner diameter of 2.7 mm is 0.8 mm from the end and 1.
Two grooves 1 having a depth of 0.1 mm and a width of 0.2 mm were provided on the inner surface of 2 mm. Then, as shown in FIG. 3, material AgCdO12% / Cu
Head diameter 4.5 mm, head thickness 1.5 mm, AgCdO12% thickness
Rivet contact 4 with 0.5mm, foot diameter 2.8mm, foot length 5mm
Was press-fitted into one end of the cylindrical body 3 as shown in FIG.
Thereafter, as shown in FIG. 5, the side into which the rivet-shaped contact 4 is press-fitted is put into the mold 5, and the rivet-shaped contact foot 7 is pressed from the other end of the cylindrical body 3 with the punch 6 having a diameter of 2.2 mm. As shown in FIG. 4, the groove 1 of the cylindrical body 3 was inserted into the groove 1 to form the contact terminal 8.

[0007]

[Prior art example] On the other hand, as shown in Fig. 7, the wire rod was header-processed, barrel-polished and heat-treated.
As shown in FIG. 8, the material AgCdO12% is used for the 4.3 mm rod 9.
/ CuNi 30%, contact diameter 4.3mm, AgCdO 12% thickness
0.5mm, CuNi 30%, 1.0mm thick disk-shaped contact 10
Fixed by electric resistance welding and contact terminals 11 as shown in FIG.
And

However, when 10 quality inspections were carried out, the welding strength in the conventional example was large and unstable, with an average value of 15 kgf and a variation of 8 kgf. On the other hand, in the examples, the fixing strength was stable with a small average variation of 16 kgf and a variation of 2 kgf, and the number of steps was small and the productivity was good.

[0009]

As described above, according to the contact terminal of the present invention, since the rivet-shaped contact foot portion is formed at one end of the cylindrical body formed by bending the plate material, the fixing strength is high. It has a stable and good productivity with a small number of steps, and further has an excellent effect that it is suitable for mass production by automation. Further, since it is a cylindrical body, it also has an excellent effect that it can effectively dissipate heat generated during opening and closing contact as an electric contact, and thus can be a long-life contact terminal.

[Brief description of drawings]

FIG. 1 is a diagram showing a plate material of an embodiment of a contact terminal of the present invention.

FIG. 2 is a view showing a cylindrical body of an embodiment of the contact terminal of the present invention.

FIG. 3 is a view showing a rivet-shaped contact of an embodiment of the contact terminal of the present invention.

4 is a view showing a state where the rivet-shaped contact of FIG. 3 is press-fitted into the cylindrical body of FIG.

5 is a view showing a state in which the rivet-shaped contact foot portion of FIG. 4 is pressed.

FIG. 6 is a diagram showing a contact terminal according to an embodiment of the contact terminal of the present invention.

FIG. 7 is a view showing a rod-shaped body of a conventional contact terminal.

FIG. 8 is a view showing a contact of a conventional contact terminal.

FIG. 9 is a view showing a conventional contact terminal.

FIG. 10 is a diagram showing a conventional contact terminal.

[Explanation of symbols] 1 groove 2 plate material 3 cylindrical body 4 rivet-shaped contact 8 contact terminal

Claims (1)

[Claims] 1. A contact terminal, wherein a rivet-shaped contact foot portion is tightly fitted to one end portion of a cylindrical body formed by bending a sheet material.