JP2870256B2 - Manufacturing method of electrical contact - Google Patents

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 an electric contact.

[0002]

2. Description of the Related Art Conventionally, as a method of electrically connecting, in addition to a method of directly connecting conductors by bolting, FIG.
As shown in the cross-sectional view of FIG. 7 and the front view of FIG. 7, a metal wire or spring 33 having elasticity is provided from the outside of a flange portion 31 in which a number of strip-shaped conductive pieces are annularly arranged and conductor insertion holes are provided at left and right ends. There is a method in which the right and left connecting conductors 40 and 41 are inserted into the conductor insertion holes and connected by using the tulip contact 30 having a structure in which is wound. In addition, 32 is a gap between adjacent conductive pieces. This connection method has been used for a long time in electric devices and the like because of its detachable connection.

Recently, a plug-in socket 5 shown in FIG.
A connection method using 0 and the insertion plug 51 is also often employed. That is, a groove 52 for fixing a contact is provided in the inner peripheral portion of the hole of the insertion socket 50, a contact having a large number of contact pieces 2 is mounted in the groove 52, and the insertion plug 51 is inserted into the groove 52. It is electrically connected.

As shown in FIG. 9, the above-mentioned contact is elastically fixed in a groove 52 of an insertion socket 50 on both sides of an elliptical contact piece 2 bulged at the center with a conductive material having elasticity. Formed by bending the leg 3 for
The contact 1 is formed in a ring shape in the circumferential direction of the hole of the insertion socket 50 so as to provide a spring property.

FIG. 10 is a development view of the contact 1. For example, a contact strip member having conductivity and elasticity, such as beryllium copper, is punched with a sheet metal to form a punched portion 4 and cutouts 5 on both sides. The leg 3 formed by the notch 5 is tilted and bent to provide resilience, and the contact strip is annularly mounted on the socket 50 side or the plug 51 side. This is a method of making multi-face contact and connecting so that sliding contact or rotational contact can be made.

Here, the inner circumference d ₁ of the contact piece 2 on the socket 50 side and the outer diameter d of the plug 51 inserted therein are d> d _1.
To have a relationship, the height h of the contact piece 2 shown in FIG. 8 by applying a pressure to the contact portion of the socket A portion of the contact piece 2 by deforming the h ₁ and the plug portion B by insertion of the plug 51 It forms an electric circuit.

[0007]

In the tulip contact shown in FIGS. 6 and 7, the flange portion 31 which is a contact piece must have a certain thickness, and elasticity is required to apply a contact pressure. It was necessary to provide a metal wire or a spring 33 having the same, and it was inevitable to increase the dimensions. In addition, the inner peripheral surface of the flange portion 31, which is a contact piece, needs to be finished smoothly so that the insertion portions of the plugs 40 and 41 are not damaged. Furthermore, the flange portion 31 is cut 32
In order to manufacture a large number of strips, it was absolutely necessary to manufacture them by machining or the like.

On the other hand, in the connection method using a plug shown in FIG. 8, the contact 1 to be interposed between the plug socket and the plug is formed with a large number of contact pieces 2 and leg portions 3 provided with spring properties. For this purpose, it is necessary to punch out a conductive and elastic contact strip-shaped member using punching dies 10, 11, as shown in FIG. For this reason, as shown in the sectional view of a part of the contact piece 2 which is enlarged in FIG. 12, a burr b having a sharp projection downward is rounded upward on the opposite side. When the contact piece 2 is formed by forming the contact piece 2 by inclining it in parallel to impart spring properties as shown in FIG. 13, the burr portion of the lower sharp projection becomes the lower contact point. That is, FIG. 14 shows an enlarged view of a part of the state where the contact piece 2 is inserted between the socket A and the plug B. Is inserted plug B, the contact piece 2 is made of its height becomes the state shown by the broken line to the state indicated by a solid line h in h _1, the contact piece 2 is rotated as shown by an arrow E, socket A and the plug B Will slide on the contact surface. At this time, a burr b having a sharp protrusion is formed below the contact piece 2.
With this, the silver plating or the like provided for the purpose of reducing the contact resistance on the contact surface of the plug B is peeled off, and a serious defect occurs in that the resistance of the electrical contact portion increases. The arrow i indicates the plug B from the socket A side.
Indicates the direction of the current flowing to the side.

When the plug B is inserted into the socket A as shown in FIG. 15, a force indicated by an arrow f acts on the socket A and the plug B to move or rotate in the direction of the arrow f, respectively. And the plug B are not preferable.

[0010] For this reason, in such a method of manufacturing a contact, a step of removing burrs is inevitably required, and a step of imparting springiness to the leg is also required.

The present invention has been made in view of the above points, and an object of the present invention is to provide a method for manufacturing an electric contact which can solve the above-mentioned disadvantages of the prior art and can maintain stable performance for a long period of time. Aim.

[0012]

SUMMARY OF THE INVENTION This invention is a multi by punching a conductive material having a bullet <br/> power resistance in thin plate in parallel at predetermined intervals
In the electric contact formed by arranging a number of contact pieces side by side , the punching directions of both ends of each contact piece are vertically opposite to each other, and the punching directions between the ends of the adjacent contact pieces are the same.
Whichever of the upper and lower punching dies at each punching part
By punching with one side, the contact piece
In the opposite direction, the ends of adjacent contact pieces are
Causes the burrs on the lower side to face each other
Forming contact pieces in mutually opposite inclinations in the shape of an eight character
And forming a sag portion having a roundness in a direction opposite to a burr generated by punching as a contact.

[0013]

The punching direction of the punching portions on both sides of the contact piece is punched so that the punching portions are adjacent to each other at the adjacent punching portions.
By forming a contact piece by forming it into an eight-letter shape so that the punched portion punched downward so that the sharp projection (burr) generated by this punching does not contact the contact surface, it forms in the opposite direction to the burr. The sagged portions serve as contacts. This eliminates the need for deburring work.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a method for punching an electric contact. That is, after the elastic strip-shaped material 1a forming the electric contact is clamped from above and below by the pressing dies 21 and 22 as shown by arrows B, the tips 25 of the upper and lower punching dies 25 and 26 are formed.
The punching is performed in the vertical direction indicated by the arrow C by 'and 26'. At this time, the upper and lower punching dies 25 and 26 are
2 are arranged alternately on both sides. As a result, the strip 1a is punched so that the punched portion is upward, downward, upward,... As shown by arrows in FIG. 2, and sharp projections (burrs) b and roundness on both sides of the contact piece 2a are formed. Sagging a occurs alternately in the opposite direction.

The contact piece 2a is formed into an octagonal shape so that the portion punched downward as shown in FIG. 3 is directed upward, as shown in FIG. The rounded sag portions serve as contacts that come into contact with the socket A side and the plug B side, respectively.

In the above example, as shown in FIG.
Are formed so as to come into contact with the insertion socket A and the insertion plug B, respectively. As a modified example, the vicinity of the contact portion is formed so as to have a large curvature in a letter shape as shown in FIG. Then it is still effective.

[0017]

As described above, according to the method for manufacturing an electric contact of the present invention, the socket A side and the plug B
The contact surface on the side is not damaged by sharp projections (burrs) generated at the time of forming the electric contact, and it is possible to maintain a stable multi-plane connection in performance. In addition, to remove sharp projections (burrs) harmful to multi-plane connection, it takes a lot of manpower and time to finish, and in some cases, one or two steps are added, which is economically expensive. According to the manufacturing method of the present invention, the necessity is eliminated, and the electric contact can be manufactured very economically. Further acts opposite force to each other in the insertion socket and the attachment plug when electrical contact is to be compressed from h because they are molded into eight characters shape h _1, socket and plug by which they are offset Has no rotational force.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a punching method applied to a method for manufacturing an electric contact according to the present invention;

FIG. 2 is a cross-sectional view showing a shape of a stamped strip-shaped member;

FIG. 3 is a sectional view showing a state in which the belt-shaped member of FIG.

FIG. 4 is a sectional view showing a use state of the electric contact of the present invention;

FIG. 5 is a sectional view of an electric contact showing a modification of the present invention;

FIG. 6 is a sectional view showing a connection method using a conventional tulip contact;

7 is a front view of FIG. 6,

FIG. 8 is a sectional view showing a method of connecting using a conventional socket and plug.

FIG. 9 is a plan view of an electric contact,

FIG. 10 is a side view showing another example of the electric contact;

FIG. 11 is a cross-sectional view showing a conventional method for punching an electric contactor;

12 is a cross-sectional view of an electric contact punched by the punching method of FIG. 11,

13 is a cross-sectional view showing a state where the electric contact of FIG. 12 is formed by being inclined in parallel;

FIG. 14 is a cross-sectional view showing a mounting state of a conventional electric contact.

FIG. 15 is a cross-sectional view showing a usage state of a conventional contact piece.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1a Electric contact 2 2a Contact piece 3 7 Leg 4 Punching part 21,22 Pressing type 10,11,25,26 Punching type a Drip part b Projection (burr) part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01R 43/16 H01R 13/187 H01R 4/60

Claims (1)

(57) [Claims] An electrically conductive material having a thin plate shape and elasticity is provided for a predetermined time.
In an electric contact formed by punching in parallel at intervals and forming a large number of contact pieces in a row , the punching directions at both ends of each contact piece are set to be opposite to each other in the vertical direction and between the ends of adjacent contact pieces.
In each punched part so that the punching direction of
By punching with one of the upper and lower punching dies
The contact pieces that are vertically adjacent and opposite at both ends of the contact piece
Burrs are generated in the same direction at the ends of the
Contact pieces facing each other at opposite ends are inverted into an eight-shape
A method for manufacturing an electric contact, characterized in that a slanted portion having a roundness in a direction opposite to that of a burr generated by punching is formed as a contact by shaping and inclining .