JPH06203681A - Contact terminal - Google Patents

Abstract

PURPOSE:To strengthen the adhesion strength and stably manufacture contact terminals in a lessened number of processes by fitting the outer circumference of the end part of a rivet-like contact leg part in a recessed part in the inside of a cylinder formed by bending a plate strip material. CONSTITUTION:A cylinder 3 having a groove 1 in the inner face part at a prescribed distance from the end of the cylinder is prepared from a plate strip in which a groove is formed at the prescribed distance from the end part. A rivet-like contact 4 is inserted by pressure from one end part of the cylinder 3 and after that the side where the rivet-like contact 4 is put in dies and the rivet-like contact leg part is pushed by a punch from the other end part of the cylinder 3 to be deep-rooted in the groove 1 of the cylinder 3 and thus a contact terminal 8 is obtained. Consequently, since the rivet-like contact leg part is fitted in the recessed part of the inside of the cylinder in the circumference of the end part of the rivet-like contact leg part, the contact terminal with high adhesion strength and high size precision is stably obtained.

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 above-mentioned 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 point was made by fixing it to one end of the rod by electric resistance welding.However, when the rod is processed by a header or the like, a shear mark is left on the surface or around the one end of the rod. However, there is a problem that welding strength after electric resistance welding is unstable and fluctuates due to the occurrence of residuals such as machining distortion and burrs. 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 which is suitable for mass production by automation. is there.

[0004]

SUMMARY OF THE INVENTION The contact terminal of the present invention for solving the above-mentioned problems is a cylindrical cylinder formed by bending a plate material into a cylindrical cylinder at the outer peripheral surface of the end of a rivet-shaped contact foot. It is characterized in that it is tightly fitted in the inner concave portion.

[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. It can be easily automated by progressive die processing and is suitable for mass production. Also, since the outer peripheral surface of the rivet-shaped contact foot portion is tightly fitted in the concave portion inside the cylindrical body, the load during the tight combination type is small, therefore there is no deformation of the cylindrical body, the dimensional accuracy is high, and the fixing strength is high. It is a high quality contact terminal that is strong, stable and reliable. Further, by further tightening the end portion of the cylindrical body under pressure, forming a hole in the end portion, and fixing with a boss for preventing slipping out, etc., further firm fixation can be achieved. Further, not only the molding of only the outer peripheral surface of the end portion of the rivet-shaped foot portion, but also the tightening by molding the entire end portion has the same effect.

[0006]

EXAMPLES Examples and conventional examples will be described below. First, as shown in Fig. 1, 6 mm from the end, depth 0.2 mm, width 1.0
As shown in Fig. 2, a cylindrical body 3 having an outer diameter of 4.3 mm and an inner diameter of 2.75 mm is formed from a brass plate material 2 of 0.8 mm in thickness provided with a groove 1 of mm, and an inner surface of 4.5 mm from the end. Depth of part 0.2m
One groove 1 of m and 1.0 mm in width was provided. Next, as shown in Fig. 3, the material is AgCdO12% / Cu and the head diameter is 4.5 mm and the head thickness is 4.5 mm.
A rivet-shaped contact 4 having a thickness of 1.5 mm, a thickness of AgCdO12% of 0.5 mm, a foot diameter of 2.8 mm, and a foot length of 5 mm was pressed 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 2.8 mm. As shown in FIG. 5, the groove 1 of the cylindrical body 3 was inserted into the groove 3 to form the contact terminal 8.

[0007]

[Prior art example] On the other hand, as shown in Fig. 7, the wire rod was molded by header processing, 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
A disk-shaped contact 10 having a thickness of 0.5 mm and CuNi 30% and a thickness of 1 mm was fixed by electric resistance welding to form a contact terminal 11 as shown in FIG.

However, when 10 quality inspections were carried out, the welding strength in the conventional example was an average value of 16.3 kgf,
The variation was 6.8 kgf and the variation was large and unstable, and the number of man-hours was large and the productivity was poor, whereas in the example, the fixing strength was an average value = 21.6 kgf, the variation = 2 kgf.
It was stable with little variation, and the productivity was good with a small number of steps.

[0009]

As described above, according to the contact terminal of the present invention, the rivet-shaped contact foot portion has the outer periphery of the end portion of the rivet-shaped contact foot portion inside the cylinder formed by bending the plate material. Since the surface is tightly fitted in the concave part inside the cylinder, there is no deformation of the cylinder, the dimensional accuracy is good, the fixing strength is strong and stable, the man-hours are good, and the productivity is high. It has an excellent effect that it is suitable for production. Further, since it is a cylindrical body, it also has an excellent effect that it can effectively dissipate the heat generated at the time of opening / closing contact as an electric contact, and thus it is 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 in which 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 view 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 diagram 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 cylindrical body formed by bending a sheet material into a cylinder, and is tightly fitted into a recess in the cylinder at the outer peripheral surface of the end of the rivet-shaped contact foot portion. Contact terminal.