JP2000076947A - Electrical contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the service life of an electrical contactor by decreasing the rate of temperature rise at a contact. SOLUTION: A rivet type contact 2 has a head 2a with a diameter of, e.g. 5 mm, and a leg part 2b with a diameter of 3 mm is projected from the center of the head 2a. A base material 1 is in the form of a strip that is, e.g. 1.5 mm thick, 5 mm wide, and 30 mm long, with a contact mounting hole 10 bored therethrough. The contact mounting hole 10 as viewed on a plane is shaped like, e.g. eight isosceles triangles, each having an apex angle of 90 degrees and a height of 0.2 mm and projected from a circle having a diameter of 3.5 mm toward the center of the circle. When the leg part 2b of the rivet type contact 2 is inserted into the contact mounting hole 10 in the base material 1, clearance that is about 0.25 mm at a maximum and 0.05 mm at a minimum forms between the leg part 2b and the contact mounting hole 10, but since the leg 2b is crushed and widened due to crimping and enters into the clearance, the leg part 2b and the contact mounting hole 10 are held in close contact to each other with no clearance therebetween.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric contact formed by caulking a rivet-type contact to a conductive base having a contact mounting hole.

[0002]

2. Description of the Related Art Conventionally, an electric contact having a structure in which a rivet-type contact is swaged to a base material such as a strip of copper having a contact mounting hole formed therein is an electromagnetic relay, an electric circuit switch, an electric circuit breaker, or the like.
It is often used for relays. FIG.
FIG. 16 (a) is an exploded perspective view of a main part, and FIG. 16 (b) shows a state where legs of a rivet type contact are inserted into a contact mounting hole of a base member. FIG. 16C is a cross-sectional side view showing a state where a rivet-type contact is swaged in a contact mounting hole of the base member.

[0003] As shown in FIG.
And a rivet-type contact 2. Base material 1
A round contact mounting hole 10 is formed in a strip-shaped copper material. The rivet type contact 2 includes a contact tip 20 and a rivet base 21. The contact chip 20 has a disk shape. As the material of the contact chip 20, a substance containing silver and a metal oxide such as tin oxide, which has high conductivity, withstands arc heat generated at the time of contact opening and closing, and has little surface roughness due to the arc, is usually used. The rivet base metal 21 is formed by processing a copper bar material, and is formed into a T-shape in a side view by forming a cylindrical base metal leg 21b at the center of a disk-shaped base metal head 21a.

[0004] The contact chip 20 is mounted on a metal head 21a.
The head 2a of the rivet type contact 2 is formed by the contact chip 20 and the base metal head 21a.
The base metal leg 21b forms the leg 2b of the rivet type contact 2 as it is.

[0005] The rivet type contact 2 as described above is shown in FIG.
As shown in (b), the leg 2b is connected to the contact mounting hole 10 of the base material 1.
After that, the tip of the leg portion 2b is crushed and crimped to be integrated with the base material 1. Then, the base member 1 and the rivet type contact 2 come into contact with each other, and the contact portion 12 has a substantially cylindrical shape or a substantially truncated conical cylindrical shape as shown in FIG.

[0006]

However, the contacts are heated by arc heat generated when the contacts are opened and closed, and Joule heat due to contact resistance between the contacts when the contacts are normally closed. Then, when the contacts are heated, the wear due to the evaporation of the contact material due to the rise in the surface temperature and the high wear due to the repeated impact force due to the softening of the contact material and the opening and closing of the contacts are likely to occur. In addition, when the contact is closed, the melted contact surface solidifies, so that welding easily occurs. Further, at the time of electrical opening, if the contact surface temperature is high immediately after the current zero point, thermoelectrons are easily emitted from the contact surface, so that re-ignition is likely to occur. Furthermore, since the contact portion 12 has a substantially cylindrical shape or a substantially frusto-conical cylindrical shape, the torsion strength is weak, and the contact state of the contact portion 12 at the time of opening and closing the contact is likely to be unstable, and the above-described wear and tear Welding,
There is a problem that re-ignition easily occurs and the life is shortened.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an excellent electrical contact that can reduce the temperature rise of the contact and extend the life. .

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to the invention as set forth in claim 1, further comprising a conductive base member having a contact mounting hole formed therein, wherein In an electric contact formed by inserting a leg portion of a rivet-type contact into a mounting hole and caulking the leg portion to the contact mounting hole, a peripheral edge of the contact mounting hole is entirely directed toward the center of the contact mounting hole. It is characterized in that irregularities are provided over the circumference.

According to a second aspect of the present invention, the angle of the recess is an obtuse angle of 90 degrees or more.

According to a third aspect of the present invention, the concave portion is chamfered by an arc.

According to a fourth aspect of the present invention, the leg is provided with a groove which fits into a projection on the peripheral edge of the contact mounting hole.

According to a fifth aspect of the present invention, the head of the rivet type contact has a regular N prismatic shape, and the leg of the rivet type contact has a regular n prismatic shape. Either the ratio of n or the ratio of n to N is an integer, and the central axes of the head and the leg are respectively coincident with each other, and the central axis of the contact mounting hole is Even if the center axes of the part and the leg are aligned and the rivet-type contact is rotated (360 ° N) degrees about the center axis, the contact mounting holes are the same before and after the rotation. .

According to the present invention, the contact mounting hole has the same contact mounting hole before and after rotation even if the contact mounting hole is rotated by 90 degrees or 180 degrees about the center axis of the contact mounting hole. It is characterized by the following.

According to the present invention, the shape of a portion surrounded by a closed line formed by intersecting the side surface of the contact mounting hole of the base member with a plane orthogonal to the thickness direction of the base member. Is characterized in that as the plane moves from the leg insertion side of the contact mounting hole to the opposite side, the area becomes substantially similar and the area increases.

In a preferred embodiment of the present invention, a portion surrounding a closed line formed by intersecting a side surface of the contact mounting hole of the base member and a plane orthogonal to a thickness direction of the base member is included. The difference between the diameter of the smallest circle to be formed and the diameter of the largest circle included in the portion enclosing the closed line increases as the plane moves from the leg insertion side of the contact mounting hole to the opposite side. It is characterized by.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of an electric contact according to the present invention will be described with reference to FIG. 1, a second embodiment will be described with reference to FIG. 2, and a third embodiment will be described. Based on FIG. 3, the fourth embodiment is based on FIGS. 4 and 5, the fifth embodiment is based on FIG. 6, and the sixth embodiment is based on FIG. The eighth embodiment is based on FIGS. 8 and 9, the eighth embodiment is based on FIGS. 10 to 12, and the ninth embodiment is based on FIGS. 13 and 14. Will be described in detail with reference to FIG.

[First Embodiment] FIG. 1 is an explanatory view showing a main part of an electric contact, FIG. 1 (a) is an exploded perspective view, and FIG. 1 (b) shows a contact mounting hole of a base material. FIG. In addition, the same reference numerals are given to portions equivalent to the electric contact described in the related art, and the detailed description thereof will be omitted.

This electric contact is different from the conventional one in that it is characterized by a plurality of protrusions projecting toward the center of the contact mounting hole 10 at the peripheral edge of the contact mounting hole 10 formed in the base material 1. This is a configuration in which a convex portion 11 is provided.

Specifically, the rivet type contact 2 has a head 2a having a diameter of 5 mm, for example, and a leg 2b having a diameter of 3 mm protrudes from the center of the head 2a. The base member 1 is, for example, a strip having a thickness of 1.5 mm, a width of 5 mm, and a length of 30 mm, and has a contact mounting hole 10 formed therein. As shown in FIG. 1B, the contact mounting hole 10 has a vertical angle of 90 degrees and a height of 0.2 mm from a circle having a diameter of 3.5 mm toward the center of the circle as shown in FIG. The shape is such that eight equilateral triangles protrude.

Therefore, when the leg 2b of the rivet type contact 2 is inserted into the contact mounting hole 10 of the base 1, the maximum distance between the leg 2b and the contact mounting hole 10 is 0.25 mm and the minimum is 0.05 m.
Although a gap of about m is generated, the leg portion 2b is crushed and spread by caulking, and the leg portion 2b enters the gap, so that the leg portion 2b and the contact mounting hole 10 come into close contact with each other without a gap.

Therefore, in the electric contact in which the rivet type contact 2 is crimped in the contact mounting hole 10 as described above, the contact area between the base member 1 and the rivet type contact 2 in the crimped portion is large. Thus, heat can be easily released from the rivet-type contact 2 to the base material 1, and a rise in the temperature of the rivet-type contact 2 can be suppressed. The leg 2 of the rivet type contact 2
Since the flesh b enters the gap between the protruding portions 11, 11, the torsion strength can be increased. In other words, the contact state between the base material 1 and the rivet type contact 2 is stable, wear, welding, and restriking are unlikely to occur, and good contact switching performance can be maintained for a long period of time.

[Second Embodiment] FIG. 2 is an explanatory view showing a main part of an electric contact, FIG. 2 (a) is an exploded perspective view, and FIG. 2 (b) shows a contact mounting hole of a base material. Rear view shown, FIG. 2 (c)
FIG. 4 is a perspective view showing a spatial shape of a contact mounting hole. In addition,
The same parts as those of the electric contact described in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The feature of this electric contact different from that of the first embodiment is the configuration of a contact mounting hole 10 formed in the base 1. 2 (b) and FIG.
As shown in (c), the contact mounting hole 10 has a circular shape with a diameter of 3.1 mm, for example, from the end face of the rivet type contact 2 on the side where the leg 2b is inserted to a position of 0.6 mm in depth. In the other portions, the apex angle is 90 degrees and the height is 0.2 mm from a circle having a diameter of 3.5 mm toward the center of the circle.
The shape is such that eight isosceles triangles protrude.

Therefore, the first contact mounting hole 10 of the base material 1 is
Leg 2 of a rivet type contact 2 similar to that of the embodiment of FIG.
When b is inserted, a gap of about 0.1 mm is formed between the leg 2b and the contact mounting hole 10 from the end face of the insertion direction side of the leg 2b to a position of 0.6 mm in depth. Then, between the leg 2b and the contact mounting hole 10, a maximum of 0.25
mm, a minimum gap of about 0.05 mm is generated, but the leg 2b is crushed and spread by caulking, and the leg 2b enters the gap, so that the leg 2b and the contact mounting hole 10 are in close contact with each other without a gap. become.

Accordingly, in the electric contact in which the rivet type contact 2 is crimped to the contact mounting hole 10 as described above, the contact area between the base member 1 and the rivet type contact 2 in the crimped portion is large. Thus, heat can be easily released from the rivet-type contact 2 to the base material 1, and a rise in the temperature of the rivet-type contact 2 can be suppressed. The leg 2 of the rivet type contact 2
Since b enters the gap between the protrusions 11, the torsion strength can be increased. That is, the contact state between the base material 1 and the rivet type contact 2 becomes stable, and wear, welding, and restriking hardly occur.
Good contact switching performance can be maintained over a long period of time.

[Third Embodiment] FIG. 3 is an explanatory view showing a main part of an electric contact, FIG. 3 (a) is an exploded perspective view, and FIG. 3 (b) shows a contact mounting hole of a base material. FIG. The same parts as those of the electric contact described in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The feature of this electric contact different from that of the first embodiment is the configuration of the contact mounting hole 10 formed in the base 1. That is, as shown in FIG. 3B, when viewed in a plan view, the contact mounting hole 10 has, for example, a regular octagon having a side of 1.5 mm, a vertex angle of 90 degrees toward the center, and a height of 0 mm. The shape is such that a total of twelve isosceles triangles each protruding from the two pairs of opposing sides, each having a length of 0.2 mm.

Therefore, the first contact hole 10 of the base 1 is
Leg 2 of a rivet type contact 2 similar to that of the embodiment of FIG.
When the b is inserted, a gap is formed between the leg 2b and the contact mounting hole 10, but the leg 2b is crushed and spread by caulking, and the leg 2b enters the gap.
b and the contact mounting hole 10 come into close contact with no gap.

Therefore, in the electric contact in which the rivet-type contact 2 is crimped to the contact mounting hole 10 as described above, the contact area between the base member 1 and the rivet-type contact 2 in the crimped portion is large. Thus, heat can be easily released from the rivet-type contact 2 to the base material 1, and a rise in the temperature of the rivet-type contact 2 can be suppressed. The leg 2 of the rivet type contact 2
Since b enters the gap between the protrusions 11, the torsion strength can be increased. That is, the contact state between the base material 1 and the rivet type contact 2 becomes stable, and wear, welding, and restriking hardly occur.
Good contact switching performance can be maintained over a long period of time.

[Fourth Embodiment] FIG. 4 is an explanatory view showing a main part of an electric contact. FIG. 4 (a) is an exploded perspective view, and FIG. 4 (b) shows a contact mounting hole of a base member. FIG. FIG.
FIG. 4 is a perspective view showing a state in which a contact mounting hole is formed in a base material. The same parts as those of the electric contact described in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The feature of this electric contact different from that of the first embodiment is the configuration of a contact mounting hole 10 formed in the base 1. That is, as shown in FIG. 4B, the contact mounting hole 10 has, for example, a diameter of 3.
From the 3mm circle to the center of the circle, the apex angle is 145 degrees 4
The shape is such that 20 1/10 isosceles triangles protrude. And the convex portion 11 of the isosceles triangle is
The contact mounting hole 10 is arranged so as to divide the circumference of the contact mounting hole 20 into equal parts, and a column having a maximum diameter of 3.1 mm can be inserted into the contact mounting hole 10.

As shown in FIG. 5, the contact mounting hole 10 is formed by punching the base material 1 using a punch 3 and a lower base 4 with a press machine. The punch 3 is a rod-shaped member made of a hard material such as carbon steel subjected to a heat treatment such as quenching. The lower base 4 is formed of a hard material such as carbon steel subjected to a heat treatment such as quenching, has a substantially rectangular parallelepiped shape, and is provided with a hole 41 into which the punch 3 can be inserted.

The contact mounting hole 10 is formed in the contact mounting hole 1
The base material 1 is placed and fixed on the lower base 4 so that the position where 0 is to be provided coincides with the hole 41, the punch 3 is pressed with a strong force from above, and the punch 3 penetrates the base material 1. . Therefore, the shape of the contact mounting hole 10 and the base material 1 of the punch 3
Is congruent with the shape of the portion penetrating through.

By the way, the corners of the punch 3 wear out during repeated use, and require re-polishing or replacement. However, the contact mounting hole 1
At 0, the angle of the concave portion 13 of the contact mounting hole 10 corresponding to the projecting corner 30 of the punch 3 is set to an obtuse angle of 145 degrees 41 minutes, so that the projecting corner 30 of the punch 3 is also obtuse. It is hard to wear, does not require much re-grinding or replacement of the punch 3, and can improve productivity when forming the contact mounting holes 10 in the base material 1.

[Fifth Embodiment] FIG. 6 is an explanatory view showing a main part of an electric contact, FIG. 6 (a) is an exploded perspective view, and FIG. 6 (b) shows a contact mounting hole of a base material. Plan view, FIG. 6 (c)
FIG. 4 is a partially enlarged view of a contact mounting hole of a base member. The same parts as those of the electric contact described in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The feature of this electric contact different from that of the first embodiment is the structure of the contact mounting hole 10 formed in the base material 1. That is, a plurality of protrusions 11 protruding toward the center of the contact mounting hole 10 are provided, and the boundary between the adjacent protrusions 11 or the base 13 of the protrusion 11 is chamfered by an arc. It is.

The contact mounting hole 10 is shown in FIG.
As shown in (b), for example, the shape is such that 16 isosceles triangles with a vertex angle of 116 degrees 57 project toward the center of the contact mounting hole 10. The isosceles triangular protrusions 11 are arranged so as to divide the circumference of the contact mounting hole 10 into 16 equal parts, and a column having a maximum diameter of 3.1 mm can be inserted into the contact mounting hole 10. ing. In addition, between adjacent sides of the convex portion 11, chamfering is performed with an arc having a radius of 0.3 mm.

Therefore, the first contact mounting hole 10 of the base material 1 is
Leg 2 of a rivet type contact 2 similar to that of the embodiment of FIG.
When b is inserted, a gap is formed between the leg 2b and the contact mounting hole 10, but the leg 2b is crushed and spread by caulking, and the leg 2b enters the gap.

By the way, when caulking, the adjacent convex portions 1
At the boundary of No. 1, that is, at the corner of the base of the convex portion 11, the leg portion 2b
It is difficult for crumbled meat to enter, especially when the crimping force is insufficient
The flesh of the leg 2b does not enter the corner of the base of the projection 11,
A gap is formed between the leg 2b and the contact mounting hole 10, and the base 1
The contact area between the contact and the rivet type contact 2 is reduced.

However, in the contact mounting hole 10 of the base member 1 of the electric contact, since the adjacent sides of the projection 11 are chamfered by an arc having a radius of 0.3 mm,
There is no corner at the base of the convex portion 11, and when crimping, the flesh of the leg portion 2 b is chamfered between adjacent sides of the convex portion 1.
3, even when the crimping force is relatively insufficient, there is no gap between the base material 1 and the leg 2b.

Therefore, in the above-mentioned electric contact, the contact area between the base member 1 and the rivet type contact 2 in the caulked portion becomes large, and heat can be easily released from the rivet type contact 2 to the base material 1. In addition, a rise in the temperature of the rivet type contact 2 can be suppressed. Further, since the leg 2b of the rivet type contact 2 enters the gap between the projections 11, the torsion strength can be increased.
In other words, the contact state between the base material 1 and the rivet type contact 2 is stable, wear, welding, and restriking are unlikely to occur, and good contact switching performance can be maintained for a long period of time.

[Sixth Embodiment] FIG. 7 is an explanatory view showing a main part of an electric contactor. FIG. 7 (a) is an exploded perspective view, and FIG. 7 (b) shows a contact mounting hole of a base member. FIG. 7 (c) is a plan view showing
FIG. 4 is a partially enlarged view of a contact mounting hole of a base member. The same parts as those of the electric contact described in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The feature of this electric contact different from that of the first embodiment is the configuration of the contact mounting hole 10 formed in the base member 1. That is, a plurality of protrusions 11 protruding toward the center of the contact mounting hole 10 are provided, and the boundary between adjacent protrusions 11 or the base of the protrusion 11 is chamfered by an arc. is there.

The contact mounting hole 10 is shown in FIG.
As shown in (b), for example, the shape is such that eight isosceles triangles having a vertex angle of 116 degrees 57 project toward the center of the contact mounting hole 10. The isosceles triangular protrusions 11 are arranged so as to divide the circumference of the contact mounting hole 10 into eight, and a column having a maximum diameter of 3.1 mm can be inserted into the contact mounting hole 10. ing. The base 15 of the convex portion 11 is chamfered by an arc having a radius of 0.3 mm.

Therefore, the first contact mounting hole 10 of the base material 1 is
Leg 2 of a rivet type contact 2 similar to that of the embodiment of FIG.
When b is inserted, a gap is formed between the leg 2b and the contact mounting hole 10, but the leg 2b is crushed and spread by crimping, and the meat of the leg 2b enters the gap.

Further, since the base 15 of the convex portion 11 is chamfered by an arc having a radius of 0.3 mm, there is no corner at the base of the convex portion 11, and the flesh of the leg portion 2b is reduced when caulking. Even if the crimping force is relatively inadequate because it easily enters the base of the convex portion 11, no gap is formed between the base material 1 and the leg portion 2b.

Therefore, in the above-mentioned electric contact, the contact area between the base member 1 and the rivet-type contact 2 in the caulked portion becomes large, so that heat can be easily released from the rivet-type contact 2 to the base member 1. In addition, a rise in the temperature of the rivet type contact 2 can be suppressed. Further, since the flesh of the leg portion 2b of the rivet type contact 2 enters the gap between the convex portions 11, 11, the torsion strength can be increased. In other words, the contact state between the base material 1 and the rivet type contact 2 is stable, wear, welding, and restriking are unlikely to occur, and good contact switching performance can be maintained for a long period of time.

[Seventh Embodiment] FIG. 8 is an explanatory view showing a main part of an electric contact, FIG. 8 (a) is an exploded perspective view, FIG. 8 (b) is an assembled perspective view, and FIG. c) is a cross-sectional plan view in a state where the leg of the rivet-type contact is inserted into the contact mounting hole. FIG. 9 is a perspective view showing a case where a contact mounting hole is formed in a base material using a press machine. The same parts as those of the electric contact described in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The feature of this electric contact different from that of the first embodiment is the configuration of the contact mounting hole 10 formed in the base member 1 and the leg portion 2b of the rivet type contact 2. That is, in the contact mounting hole 10, a plurality of protrusions 11 protruding toward the center of the contact mounting hole 10 are provided,
A groove 20 is provided in the leg 2b of the rivet type contact 2 in parallel with the central axis. When the leg 2b is inserted into the contact mounting hole 10, the projection 11 fits into the groove 20 of the leg 2b. It is a configuration that fits tightly.

The rivet type contact 2 has a head 2a having a diameter of, for example, 5 mm. A leg 2b protrudes from the center of the head 20a. The leg 2b is arranged around a cylinder having a diameter of 3.5 mm in parallel with the central axis of the rivet-type contact 2,
Sixteen isosceles triangular grooves 20 having a depth of 0.25 mm and an apex angle of 116 degrees 57 are provided so as to divide the periphery of the leg 2b into 16 equal parts.

The base material 1 has, for example, a thickness of 1.5 mm and a width of 5 mm.
mm and a length of 30 mm, and has a contact mounting hole 10 formed therein. In a plan view, the contact mounting hole 10 has such a shape that 16 isosceles triangles having a vertex angle of 116 degrees and 57 degrees project from a circle having a diameter of 3.6 mm toward the center of the circle. The convex part 1 of this isosceles triangle
1 is arranged so that the circumference of the contact mounting hole 10 is divided into 16 equal parts, and the maximum diameter of the contact mounting hole 10 is 3.1 mm.
Column can be inserted.

Therefore, when the leg 2b of the rivet type contact 2 is inserted into the contact mounting hole 10 of the base 1, the 16 isosceles triangular protrusions 11 are provided on the leg 2b of the rivet type contact 2. Fit into the 16 grooves 20 thus formed.

That is, in the electric contact as described above, the gap between the contact mounting hole 10 and the leg 2b when the leg 2b of the rivet type contact 2 is inserted into the contact mounting hole 10 is formed. , Can be uniformly reduced. In particular, adjacent convex portions 11, 1
The contact mounting hole 10 and the leg 2 in the recess 13 at the first boundary
b can be reduced, and when caulking, the leg 2b
Is easy to enter the concave portion 13 at the boundary between the convex portions 11 and 11, and even when the crimping force is relatively insufficient, no gap is formed between the base material 1 and the leg portion 2b.

Therefore, in the above-mentioned electric contact, the contact area between the base member 1 and the rivet-type contact 2 in the caulked portion becomes large, so that heat can be easily radiated from the rivet-type contact 2 to the base member 1. In addition, a rise in the temperature of the rivet type contact 2 can be suppressed. Further, since the leg 2b of the rivet type contact 2 enters the gap between the projections 11, the torsion strength can be increased.
In other words, the contact state between the base material 1 and the rivet type contact 2 is stable, wear, welding, and restriking are unlikely to occur, and good contact switching performance can be maintained for a long period of time.

By the way, as shown in FIG. 9, the contact mounting holes 10 are formed in the base material 1 by a press machine 6.
The movable portion 61 of the press 6 is provided with a square column-shaped mounting hole having a square cross section. A punch mounting part 32 having a square cross section at one end of the punch 3 and having a square pole shape is inserted into this mounting hole, and the set screw 7 is tightened from the side surface of the movable part 61 of the press 6 so that the periphery of the punch mounting part 32 is removed. The punch 3 is fixed to the movable part 61 of the press 6 by pressing the tip of the set screw 7 toward the groove 32 a provided in the press machine 6.

At this time, in the above-mentioned electric contact,
The protrusion 11 of the contact mounting hole 10 of the base member 1 is
Is a multiple of "4", for example, "1"
6 ". Therefore, even if the fixing of the punch 3 to the movable portion 61 of the press 6 is rotated by 90 degrees, 180 degrees or 270 degrees, the contact mounting holes 10 of exactly the same shape are formed at exactly the same position of the base material 1. Is formed, which is convenient because it is not necessary to consider the direction when setting the punch 3.

[Eighth Embodiment] FIG. 10 is an explanatory view showing a main part of an electric contact, FIG. 10 (a) is an exploded perspective view, and FIG. 10 (b) is an assembled perspective view. FIG. 11 is an explanatory view showing the relationship between the shape of the leg of the rivet-type contact and the shape of the contact mounting hole of the base material. FIG. 11A is a bottom view showing the leg of the rivet-type contact, and FIG. b) is a plan view showing the state of the contact mounting holes when the base material is placed in the horizontal direction, FIG.
(C) is a plan view showing a state of a contact mounting hole when the base material is placed in a vertical direction. FIG. 12 is a perspective view of a main part showing a state in which the head of the rivet type contact is clamped by an automatic caulking machine and the legs are inserted into the contact mounting holes of the base material.

The features of this electric contact different from those of the prior art are that the shape of the contact mounting hole 10 drilled in the base 1, the shape of the head 2a of the rivet type contact 2, and the shape of the leg 2b are different. Is formed into a specific relationship.

That is, the head 2a of the rivet type contact 2 has a regular N prismatic shape, the leg 2b of the rivet type contact 2 has a regular n prismatic shape, and a contact mounting hole formed in the base material 1. 10
Are leg portions 2b of the rivet type contact 2 into which the leg portions 2b can be inserted.
b, is a congruent n-gon which is substantially congruent with the cross-sectional shape of b, wherein either the ratio of the N to the n or the ratio of the n to the N is an integer, and the head 2a and the leg 2b The center axes of the head 2a and the leg 2b are aligned with the center axis of the contact mounting hole 10, and the rivet-type contact 2 is rotated about the center axis (360 ° N). That is, when rotated by degrees, the contact mounting holes are the same before and after the rotation.

In the electric contact according to the present embodiment shown in FIG. 10, only the head 2a of the rivet type contact 2 is a square with a side of 5 mm and a thickness of 1.5 mm. The shape and configuration of the portion other than the head portion 2a are the same as those of the above-described seventh embodiment, and the same reference numerals are used in the portions equivalent to the electric contacts described in the seventh embodiment. And a detailed description thereof will be omitted.

In the rivet type contact 2, as shown in FIG. 11, the head 2a and the leg 2b are formed so that the central axes P coincide. Then, while making one side of the square head 2a and one side of the strip-shaped base plate 1 parallel, the center axis P of the rivet type contact 2 and the center axis P of the contact mounting hole 10 are made to coincide with each other, and When the contact 2b is inserted into the contact mounting hole 10, the 16 projections 11 of the contact mounting hole 10 fit into the 16 grooves 20 provided so as to divide the periphery of the leg 2b into 16 equal parts. The rivet-type contact 2 and the base plate 1 are configured to have a specific relationship such that the 2b can be inserted into the contact mounting hole 10.

That is, as shown in FIG. 11, the head 2a and the leg 2b of the rivet-type contact 2 and the contact mounting hole 10 of the base plate 1 are aligned with the center axis P of the rivet-type contact 2 and the contact mounting hole 10. When the rivet-type contact 2 is lowered while keeping the center axis P coincident with the center axis P, the leg 2b
Rivet type contact 2 is fixed in this state, and the base plate 1 is
Even if the rivet type contact 2 is lowered after being rotated (360３4) = 90 degrees around the
Are fitted in the contact mounting holes 10 of the base plate 1.

When caulking is performed by an automatic caulking machine as shown in FIG. 12, the side surface of the square head 2a of the rivet type contact 2 is sandwiched between the tips of four arms 5, for example. Central axis P of contact mounting hole 10 and rivet type contact 2
The rivet-type contact 2 is moved to a position where the central axis P of the rivet-type contact 2 coincides with the center axis P, and the leg 2b of the rivet-type contact 2 is inserted into the contact mounting hole 10 of the base 1, and finally crimping is performed.

In the case where such an automatic crimping machine is used, in the case of the electric contact having the above-described specific relationship, the head 2a of the rivet type contact 2 is set at 90 degrees or 180 degrees. Arm 5 in the state rotated by 270 degrees or 270 degrees.
, It is possible to perform automatic caulking without any trouble.

Therefore, if an expensive automatic machine is used, the positional deviation between the bottom surface shape of the leg 2b of the rivet type contact 2 and the contact mounting hole 10 of the base material 1 is detected by pattern recognition by image processing, etc. The leg 2b of the rivet-type contact 2 is automatically adjusted to adjust the displacement and the rotational displacement.
It is possible to insert the
The use of the electric contacts having the specific relationship as described above eliminates the need for pattern recognition by image processing and the like, and enables automatic crimping with an inexpensive automatic crimping machine.

[Ninth Embodiment] FIG. 13 is an explanatory view showing a main part of an electric contact, FIG. 13 (a) is an exploded perspective view, and FIG. 13 (b) is a spatial shape of a contact mounting hole. FIG. FIG. 14 is a cross-sectional side view showing a state in which a rivet-type contact is crimped into a contact mounting hole of a base member. The same parts as those of the electric contact described in the fourth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 13, this electric contact differs from the electric contact described in the fourth embodiment in that the electric contact is characterized by the side surface of the contact mounting hole 10 of the base 1 and the electric contact of the base 1. The shape of the portion surrounding the closed intersection line formed by intersecting the plane orthogonal to the plate thickness direction is the leg 2b of the contact mounting hole 10.
The contact mounting hole 10 is formed so as to be divergent so that the area becomes larger in a substantially similar shape as it moves from the insertion side to the opposite side.

That is, the shape of the contact mounting hole 10 on the insertion side surface of the leg 2b of the base material 1 is, for example, 3.3 m in diameter.
The shape is such that 20 isosceles triangles having a vertex angle of 145 degrees 41 project from the circle m toward the center of the circle. The isosceles triangular projections 11 are arranged so as to divide the circumference of the contact mounting hole 10 into 20 equal parts, and a column having a maximum diameter of 3.1 mm can be inserted into the contact mounting hole 10. I have. The angle formed by the adjacent sides of the convex portion 11 is 145 degrees 41 minutes.

The shape of the contact mounting hole 10 on the surface of the base 1 opposite to the insertion side surface of the leg 2b is substantially similar to the shape of the contact mounting hole 10, and is a circle having a diameter of 4.0 mm. , The shape is such that 20 isosceles triangles with a vertex angle of 145 degrees 41 project toward the center of the circle.

In the first embodiment, for example, a head 2a having a diameter of 5 mm is provided in the contact mounting hole 10 of the base material 1, and a leg 2b having a diameter of 3 mm protrudes from the center of the head 2a. When the leg 2b of the rivet type contact 2 similar to that of the embodiment is inserted, a state as shown in FIG. Then, although the gap is formed between the leg portion 2b and the contact mounting holes 10, collapses the foot portion 2b by crimping, meat leg 2b spreads direction H ₁ shown in FIG. 14 (b). The leg 2 b is expanded at a boundary between the adjacent protrusions 11, 11 by increasing the spread in the direction orthogonal to the tip of the protrusion 11.
Can supply a lot of meat.

The leg 2b is swaged to
Direction H perpendicular to the thickness direction of base material 1 _TwoSpread. Convex part 1
The supply of the meat of the leg 2b to the base of
Direction is H_TwoWide to
It is performed only by glue, but in the case of this embodiment
Is the direction H because the contact mounting hole 10 is widened.
₁The spread of meat to the direction H_TwoIn addition to the spread to
Plastic deformation due to compression of the leg 2b, that is, the direction H_ThreeWhat
The direction H_TwoWhat
Spreads more than when only spreading
it can. That is, in the electric contact as described above,
When caulking, the flesh of the leg 2b is adjacent to the convex portion 11, 11
When the crimping force is relatively insufficient
However, there is no gap between the base 1 and the leg 2b.

Therefore, in the above-mentioned electric contact, the contact area between the base member 1 and the rivet type contact 2 in the caulked portion becomes large, and the heat can be easily released from the rivet type contact 2 to the base material 1. In addition, a rise in the temperature of the rivet type contact 2 can be suppressed. Further, since the leg 2b of the rivet type contact 2 enters the gap between the projections 11, the torsion strength can be increased.
In other words, the contact state between the base material 1 and the rivet type contact 2 is stable, wear, welding, and restriking are unlikely to occur, and good contact switching performance can be maintained for a long period of time.

[Tenth Embodiment] FIG. 15 is an explanatory view showing a main part of an electric contact, FIG. 15 (a) is an exploded perspective view, and FIG. 15 (b) is a spatial shape of a contact mounting hole. FIG. The same parts as those of the electric contact described in the ninth embodiment are denoted by the same reference numerals, and the detailed description thereof will be omitted.

As shown in FIG. 15, this electric contact is different from the electric contact described in the ninth embodiment in that the electric contact is characterized by the side surface of the contact mounting hole 10 of the base 1 and the electric contact of the base 1. The difference between the diameter of the smallest circle enclosing the portion surrounding the closed intersection line formed by intersecting the plane orthogonal to the plate thickness direction and the diameter of the largest circle included in the portion surrounded by the closed intersection line, The configuration is such that the plane becomes larger as the leg 2b of the contact mounting hole 10 moves from the insertion side to the opposite side.

That is, the shape of the contact mounting hole 10 on the insertion side surface of the leg 2b of the base material 1 is, for example, 3.1 m in diameter.
m. The shape of the contact mounting hole 10 on the side opposite to the insertion side of the leg 2b of the base member 1 is, for example, from a circle having a diameter of 3.3 mm to a vertex angle of 14 mm from the center of the circle.
The shape is such that 20 isosceles triangles of 5 degrees 41 minutes protrude. The isosceles triangular protrusions 11 are arranged so as to divide the circumference of the contact mounting hole 10 into 20 equal parts.
A column having a maximum diameter of 3.1 mm can be inserted into the contact mounting hole 10. The angle formed by the adjacent sides of the convex portion 11 is 145 degrees 41 minutes.

That is, as shown in FIG. 15, the shape of the portion surrounded by the closed line formed by the intersection of the plane perpendicular to the thickness direction of the base material 1 and the side surface of the contact mounting hole 10 is the shape of the base material 1
As the plane perpendicular to the thickness direction moves from the insertion side of the leg 2b of the base member 1 to the opposite side, the tip angle of the isosceles triangular projection 11 becomes acute.

When caulking the leg 2b of the rivet type contact 2, the portion of the leg 2b on the side of the head 2a is connected to the head 2a.
Conversely, the distal end portion of the leg portion 2b is not restricted by connection or the like, so that the diameter tends to increase.

That is, the rivet type contact 2 as described above
In the case of crimping the tip of the leg 2b in the vertical direction,
In the vicinity of the head 2a, it is difficult for the meat of the leg portion 2b to enter the boundary between the adjacent convex portions 11 and 11.
a, the flesh of the leg 2b is adjacent to the convex 1
It is easy to get into the boundary between 1 and 11.

In other words, by increasing the height of the convex portion 11 from the insertion side of the leg portion 2b of the contact mounting hole 10 to the opposite side, even when the crimping force is relatively insufficient, The meat of the leg 2b spreads uniformly between the material 1 and the leg 2b, and no gap is generated.

Therefore, in the above-mentioned electric contact, the contact area between the base member 1 and the rivet-type contact 2 in the caulked portion becomes large, and the heat can be easily released from the rivet-type contact 2 to the base member 1. In addition, a rise in the temperature of the rivet type contact 2 can be suppressed. Further, since the leg 2b of the rivet type contact 2 enters the gap between the projections 11, the torsion strength can be increased.
In other words, the contact state between the base material 1 and the rivet type contact 2 is stable, wear, welding, and restriking are unlikely to occur, and good contact switching performance can be maintained for a long period of time.

[0081]

According to the first aspect of the present invention, the torsion strength of the rivet-type contact with respect to the base material is large, the temperature rise of the rivet-type contact can be suppressed, and the consumption and welding of the contact can be prevented.
It is possible to provide an excellent electric contact that is less likely to cause restriking and can maintain good contact switching performance for a long period of time.

According to the second aspect of the invention, in addition to the effects of the first aspect, the number of times of re-grinding the punch and the number of times of replacing the punch can be reduced, and the contact mounting hole is formed in the base material. This provides an effect of being able to provide an excellent electric contact that can improve the productivity when performing the operation.

According to the third aspect of the invention, in addition to the effect of the first aspect, even if the crimping force is relatively insufficient, the distance between the base material and the leg of the rivet-type contact can be improved. In this case, there is an effect that an excellent electric contact can be provided without generating a gap.

According to the fourth aspect of the invention, in addition to the effect of the first aspect, even if the crimping force is relatively insufficient, the distance between the base material and the leg of the rivet-type contact can be improved. In this case, there is an effect that an excellent electric contact can be provided without generating a gap.

According to the fifth aspect of the present invention, in addition to the effect of the fourth aspect of the present invention, since the crimping can be automatically performed by an inexpensive machine, the crimping can be performed at a low cost. This has the effect of providing a child.

According to the sixth aspect of the present invention, in addition to the effects of the first aspect, even if the mounting position of the punch to the movable portion of the press machine is rotated by 90 degrees or 180 degrees, the base material Therefore, the position and the shape of the contact mounting hole with respect to are not changed, and it is possible to provide an excellent electric contact with good setting efficiency of the production machine.

According to the seventh aspect of the present invention, in addition to the effect of the first aspect, even if the crimping force is relatively insufficient, the distance between the base material and the leg of the rivet-type contact can be improved. In this case, there is an effect that an excellent electrical contact can be provided, in which a gap is not uniformly formed.

According to the eighth aspect of the invention, in addition to the effect of the first aspect, even if the crimping force is relatively insufficient, the distance between the base material and the leg of the rivet-type contact can be improved. There is an effect that an excellent electric contact can be provided in which no gap is uniformly formed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a main part of an electric contact according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a main part of an electric contact according to a second embodiment of the present invention.

FIG. 3 is an explanatory view showing a main part of an electric contact according to a third embodiment of the present invention.

FIG. 4 is an explanatory view showing a main part of an electric contact according to a fourth embodiment of the present invention.

FIG. 5 is a perspective view showing a state in which a contact mounting hole is formed in a base material of the electric contact.

FIG. 6 is an explanatory view showing a main part of an electric contact according to a fifth embodiment of the present invention.

FIG. 7 is an explanatory view showing a main part of an electric contact according to a sixth embodiment of the present invention.

FIG. 8 is an explanatory view showing a main part of an electric contact according to a seventh embodiment of the present invention.

FIG. 9 is a perspective view showing a case where a contact mounting hole is formed in a base material of the electric contact using a press machine.

FIG. 10 is an explanatory view showing a main part of an electric contact according to an eighth embodiment of the present invention.

FIG. 11 is an explanatory view showing the relationship between the shape of a leg of a rivet-type contact of the electric contact and the shape of a contact mounting hole of a base member.

FIG. 12 is a main part perspective view showing a state in which the head of the rivet-type contact of the electric contact is held by an automatic assembling machine and the leg is inserted into the contact mounting hole of the base member.

FIG. 13 is an explanatory view showing a main part of an electric contact according to a ninth embodiment of the present invention.

FIG. 14 is a cross-sectional side view showing a state in which a rivet-type contact is crimped into a contact mounting hole of a base member of the electric contact.

FIG. 15 is an explanatory view showing a main part of an electric contact according to a tenth embodiment of the present invention.

FIG. 16 is an explanatory view showing a conventional electric contact.

[Explanation of symbols]

 Reference Signs List 1 base material 10 contact mounting hole 11 convex portion 13 concave portion 2 rivet type contact 2a head 2b leg 20 groove P central axis

Claims (8)

[Claims] 1. An electric machine comprising: a conductive base member having a contact mounting hole formed therein; a leg of a rivet-type contact inserted into the contact mounting hole; and a leg crimped to the contact mounting hole. In the contact, the peripheral edge of the contact mounting hole is provided with irregularities all around the center of the contact mounting hole. 2. The electrical contact according to claim 1, wherein the angle of the recess is an obtuse angle of 90 degrees or more. 3. The electrical contact according to claim 1, wherein the recess is chamfered by an arc. 4. The electric contact according to claim 1, wherein the leg is formed with a groove that fits into a protrusion on the peripheral edge of the contact mounting hole. 5. The head of the rivet-type contact has a regular N prismatic shape, and the leg of the rivet-type contact has a regular n prismatic shape, and has a ratio of the N to the n or the n and the n N is an integer, and the central axes of the head and the leg coincide with each other, and the central axis of the head and the leg is at the central axis of the contact mounting hole. 5. The electric contact according to claim 4, wherein even if the rivet-type contact is rotated about the central axis by (360 ° N), the contact mounting hole is the same before and after the rotation. 6. The contact mounting hole according to claim 1, wherein even if the contact mounting hole is rotated by 90 degrees or 180 degrees about the center axis of the contact mounting hole, the contact mounting hole is the same before and after the rotation.
An electrical contact as described. 7. A shape of a part surrounding a closed intersection line formed by intersecting a side surface of the contact mounting hole of the base material and a plane orthogonal to a thickness direction of the base material is such that the flat surface is formed of the contact mounting hole. 2. The electric contact according to claim 1, wherein the area is increased in the substantially similar shape as the leg moves from the leg insertion side to the opposite side. 8. A diameter of a minimum circle enclosing a portion surrounding a closed intersection line formed by intersecting a side surface of a contact mounting hole of the base member and a plane orthogonal to a thickness direction of the base member; The difference from the diameter of the largest circle included in the portion surrounding the intersection line, as the plane moves from the leg insertion side of the contact mounting hole to the opposite side,
2. The electrical contact according to claim 1, wherein the electrical contact increases.