JPS60205914A - Electric contactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrical contact having a three-layer contact block.

<Prior art and its problems> The electric contact that makes the contact block of 3jΔ
For example, the three-layer structure of the contact block 1 used as a movable contact piece of an electromagnetic relay is, as shown in FIG. Contact materials 42 and 43 provided on both end faces
Specifically, a three-layer structure consisting of a combination of silver-copper monosilver, silver cadmium oxide-copper-silver cadmium oxide, etc. is known.

However, an electric fuser in which the contact materials 42 and 43 on both sides are made of the same material is suitable or unsuitable depending on the load capacity and type, and the contact material 42 on one side is suitable for direct current, while the other When switching different types of loads with the same polarity, such as switching alternating current using the contact material 43 on one side, there is a drawback that both loads cannot be switched sufficiently.
In a three-layer structure of copper and silver, this silver is susceptible to fi deterioration due to arcing caused by switching on and off of alternating current, and the transfer of contacts is likely to occur when switching on and off of direct current, making it difficult to maintain the life of the contacts.

<Object of the invention> This invention was made in order to eliminate the above-mentioned drawbacks.
<Structure and Effects of the Invention> It is an object of the present invention to provide an electrical contact that can sufficiently switch and close different types of loads with the same polarity. In an electric contact consisting of a contact material fixed to a surface and a conductive plate to which the base material is fixed, different materials are used for the contact materials provided on both end surfaces of the base material.

In this type of A14 configuration, both contact materials are made of materials that correspond to the respective switching loads, and an electrical contact that can switch and close different types of loads with the same polarity and sufficiently cope with arcing and contact transfer phenomena is created. can get.

<Explanation of Examples> Embodiments of the present invention will be described below with reference to all the drawings.

FIG. 1 is a front view of a contact mechanism according to an embodiment of the present invention. In this figure, l is an electric contact used as an OJ moving contact piece, and includes a conductive plate 2, a base material 3a fixed to the conductive plate 2 by penetrating it in the front and back directions, and this base material 3.
Contact material 3 'l) fixed to both end faces of a, 3 Q
It consists of 4 and 5 are fixed contact pieces, and base materials 6'b and 7 each have contact materials 6a and 7a of 1η11 on one end surface.
b is fixed to conductive materials 8 and 9. However, contact material 3
b faces the contact material 6a, and the contact material 3C faces the contact material 7a. In the above configuration, the contact material 3b of the μJ moving contact block 3
The one base material 3a and the contact material 3C are made of different materials. For example, silver copper 3b - copper 3a - silver cadmium oxide 3
C, a combination of silver copper 3b-copper 3a-silver indium 3C, etc. 9. If the contact material of the movable contact block 3 is, for example, silver copper 3b-copper 3a-silver indium 3C, the fixed contact block 6 The contact material 6a of the fixed contact block 7 can be made of silver copper, and the contact material 7a of the other fixed contact block 7 can be made of silver indium. In this case, one side would be a silver-indium contact and the other side would be a silver-copper contact. Here, silver-indium contacts, for example, are more resistant to arcs than silver contacts, making them suitable for opening and closing AC motor circuits, for example, and silver-copper contacts are less susceptible to transfer phenomena than silver contacts, for example,
It is suitable for opening and closing the DC circuit for braking an AC motor.

Therefore, with the contact structure of the above embodiment, the life of the contact can be maintained for a long time, and different types of loads can be sufficiently opened and closed with the same polarity.

Figures 2 (C) to (E) show the manufacturing process 4 of the above 1d gas contact 1.
1- Show. First, as shown in (A), a disc-shaped contact material 3b,
3c and the base material 3a are used. Next, as shown in (B), contact materials 3b are placed on both end surfaces of the base material 3a.

After 3C is fixed by brazing, the contact block 3 is pressure-molded into a rivet shape as shown in <C>. Next, as shown in (13), the legs 3d of the contact block 3 are inserted into the mounting holes (not shown) of the conductive plate 2, and the head g
With ls 3 e locked to -11111+4i tc of the conductive plate 2, the leg 3d is fixed to the other side of the Jl electric plate 2 by the screws, as shown in (Iiii), and the predetermined ゛1υ; gas contact l is obtained;
The constant contact pieces 4 and 5 shown in the figure are also manufactured in the same manner as the above-mentioned I electric contact l.

FIG. 3 shows an example in which the contact device described in FIG. 1 is mounted on the all-electromagnetic relay. In this figure, 2o is a base, on which the vertical part 21a of the L-shaped yaw 21 is erected.r 22 is an iron core, which is fixed to the vertical part 21a of the yoke 21. 23 is a coil, iron core 2
It is wound around the outer periphery of 2 with a sprue A'24 interposed therebetween. 2
56 is a movable iron piece that is swingably supported by a hinge at the tip of the horizontal portion 21t of the yoke 21, facing the tip magnetic pole surface 22a of the iron piece 22. Reference numeral 26 denotes a return tension spring, which is stretched between the upper end protrusion 25a of the movable iron piece 25 and the upper end protrusion 21 (2) of the yoke 21. The conductive plate 2 is supported by an insulating member 27 and a movable iron piece 25.The conductive plate 2
The upper end of the movable contact block 3 is connected to the common terminal 29 by a lead wire 28, and the movable contact block 3 is connected to the fixed contact block 7 below the insulating member 27 by the spring force of the tension spring 26. The conductive plates 8 and 9 of the fixed contact piece 4.5 which is spaced apart and in contact with the other fixed contact block 6, and which are provided with these fixed contact blocks 6.7, are connected to the common terminal 29 and the coil terminal 30. It is also provided on the base 2o.

31 is a case.

In the above configuration, when the coil/l' 23 is excited, the ijj iron piece 25 is attracted to the tip magnetic 4 contact 22a of the iron 22, and the single moving contact block 3 is separated from the normally closed identification contact block 6. and comes into contact with the fixed contact block 7 of the normally open fill. When the power supply to v23 is cut off, the tension spring 26 causes the iJ moving iron piece 25 to separate from the iron U22 and return to its original state. Switch to .

+11. Front view showing the metal parts of the contact block of a complete contactor, Figures 2 (A) to (
E) is a perspective view showing the manufacturing process of the air contactor, and Figure 3 is an example of the above-mentioned air vent contactor mounted on a ground relay. Fig. 4 is a front view of the conventional example.
Table material, 3b, 3c...Contact 4; J.

No. 1181 Yu i'i'+ 21::<1 (A) (B) (C)

Claims (1)

[Claims] (1) 4 units? In an electrical contact consisting of a contact material fixed to both end faces of this composite material and a conductive plate to which the base material is fixed, the contact materials provided on both end faces of the base material are made of different materials. An electric contact characterized in that it is used.