JPH0413806B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a method of manufacturing a bridging contact device mainly used in a small-force, small-sized electromagnetic contactor.

[Prior art and its problems]

2. Description of the Related Art Conventional contact devices of this type are shown in FIGS. 6 to 10 as examples employed in electromagnetic contactors. In the figure, a pair of fixed contacts 2a and 2b are installed on the front side of an insulating case 1 at a predetermined interval on the same axis.
Fixed contacts 3a, 3b are attached to the fixed contacts 2a, 2b on the spaced sides, respectively, and a terminal (not shown) extends on the opposite side. A contact support 4 that is guided by the inner wall of the insulating case 1 and is movable in the vertical direction as shown in FIG. 6 is provided between the fixed contacts 2a and 2b. A square hole 4a is provided that passes through the shaft along the axis, and the other end is connected to an electromagnet having a return spring (not shown). Contact support 4
A movable contact 5 is supported through the square hole 4a, and is prevented from falling off by the spring force of a contact spring 6 and a spring receiver 7. The movable contact 5 is of a bridge type and consists of a contact mounting part 5a at both ends and a mounting part 5b for the spring receiver 7 in the center.
It is divided. The contact mounting portion 5a is divided into two movable contacts 8a ₁ , 8a ₂ and 8b ₁ , which face the fixed contacts 3a and 3b, respectively.
8b ₂ is integrated. The spring receiver 7 has a seat plate 7b that fits into the mounting portion 5b of the movable contact 5 and has a protrusion 7a in the center, and a seat plate 7b that is bent from both ends of the seat plate 7b and rises from both outer walls of the square hole 4a of the contact support 4. It is composed of a leg piece 7c that protrudes and becomes wider. Therefore, there are multiple contact points between the fixed contacts 3a, _3b and the movable contacts _{8a 1 ,} 8a ₂ ; Even if such a situation occurs, the contact is maintained by the other contact point and current can be applied.

However, in the contact device with this configuration, in order to improve contact reliability, the movable contacts 8a 1 , 8a ₁ of the movable contact 5 are
Contact mounting part 5a in which 8a ₂ ; 8b ₁ and 8b ₂ are integrated
is divided into two by the narrow groove 5c, and the movable contacts 8a ₁ , 8a ₂ ; 8b ₁ , 8b ₂ are bent as a means of increasing the amount of sliding on the surfaces of the fixed contacts 3a, 3b during contact, thereby creating a flexible portion. The length L is increased. Therefore, the material dimensions required to manufacture the movable contact 5 are the width A of the contact mounting part 5a, the width B of the narrow groove 5c, and the width C of the connecting part in the plate stamping process, as shown in Fig. 10. , if the developed length corresponding to the width of the material is W, then it becomes [(2×A)+B+C]×W, which results in poor material yield, and furthermore, the movable contacts 8a ₁ , 8a ₂ ; 8b are attached to the contact mounting portion 5a of the movable contact 5. _1,8
Since spot welding is generally used to integrate b ₂ , positioning is troublesome and takes a lot of time, and the unit price of parts becomes high. 8a ₁ , 8a ₂ ;
Since the widths of 8b ₁ and 8b ₂ must be made slightly larger than (2×A)+B, this also has the disadvantage of increasing the unit cost of the parts.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a contact device that eliminates the above-mentioned conventional drawbacks and reduces the unit cost of parts without deteriorating contact reliability.

[Key points of the invention]

The gist of the present invention is to provide a pair of fixed contacts each having a fixed contact, each of which has an extended terminal and is arranged at a predetermined interval on the same axis, and a pair of fixed contacts each having a fixed contact. A contact support that is guided so as to be able to reciprocate at intervals, has a square hole passing through the stationary contact along the axis of the fixed contact at one end, and is connected to a drive device at the other end, and a spring receiver on the side of the other end of the square hole. A method for manufacturing a contact device comprising a movable contact piece that is pressed by a contact spring through the contact piece and has movable contacts at both ends that can come into contact with and separate from the fixed contact, wherein the spring receiver is made to straddle the side of the other end. A recess is formed in the center of the inner side of the top side of the engageable gate shape by molding a synthetic resin in which both leg pieces are integrated through a narrow neck, and the neck is sandwiched between the movable contact piece and the spring holder from both sides. A long hole on the axis line that extends along the axis and a convex portion that fits into the recess are provided, a movable contact made by cutting the wire is fixed, and after press molding, the wire rod is cut from both ends along the axis line toward the long hole to divide it into two parts. The objective is to reduce the unit price of parts.

[Embodiments of the invention]

1 to 5 are diagrams showing an embodiment of the method for manufacturing a contactor device according to the present invention. In the drawings, the same parts as in the method for manufacturing the conventional device shown in FIG. The differences will be explained based on the correspondence. The difference in the manufacturing method of the conventional device in this embodiment is that first, both ends of the movable contact piece 15 are made axially symmetrical and narrow, which corresponds to twice the width A of the strip of the conventional device, and the central part is made thin in the conventional device. A long hole 15a with a width B is provided on the axis as the groove width B is added (2×A)+B, and after bending the step, a movable contact 1 made of a wire is attached at both ends.
8a and 18b are spot-fixed, cut to an appropriate length, press-formed, and then cut along the axis from both ends to divide it into two parts. Next, the spring receiver 17 is made of synthetic resin and the movable contact piece 15 divided into two parts is integrated so that the same deflection length L can be maintained in a narrower space. Furthermore, by narrowing the width of both ends of the movable contact piece to 2×A, it is possible to downsize the fixed contacts 13a and 13b. To explain in more detail, the movable contact piece 15 is constructed as shown in Fig. 5 with route numbers and the outline of the work contents: (1), (2)... external shape and hole punching, (3)... step difference at both ends. Bending and projection 15
(4)...Fixing and cutting of the movable contacts 18a, 18b by spot-attaching wire rods such as silver, (5)...Press molding of the movable contacts 18a, 18b, (6)...Above the axis from both ends For example, it is divided into two parts by cutting. This makes it possible for the movable contact piece 15 to undergo this series of operations within the press mold, thereby significantly shortening the machining time. On the other hand, as mentioned above, the spring receiver 17 is formed into a gate shape by molding synthetic resin, and a projection 17b for guiding one end of the contact spring 6 is provided at the upper center of the top side 17a, and a movable contact is provided at the lower center. Recess 17 into which protrusion 15b of piece 15 fits
A protruding seat 17d having a diameter c is provided, respectively. Furthermore, a leg piece 17f having a narrow neck portion 17e located on the axis is extended on each of the longitudinally opposing sides of the top side portion 17a, and can sandwich both end walls from inside the square hole 4a of the contact support 4. It's becoming possible. Then, the movable contact pieces 15 and the spring receiver 17 are inserted into the square hole 4a of the contact support 4 by inserting each of the divided movable contact pieces 15, 15 from both sides of the neck 17e of the spring receiver 17, and pushing the protrusions. 1
5b is engaged with the recess 17c of the protruding seat 17d, and the movable contacts 15, 15 are integrated via the spring receiver 17. After that, the square hole 4 is integrated.
A is inserted and the contact spring 6 is attached and fixed at a position where the leg side 17f straddles the square hole 4a. Therefore, there is no risk of it falling off after being inserted and fixed into the square hole 4a.

In the method for manufacturing a contactor device having the above configuration, the movable contactor 15 is made into a blank in which both ends are axially symmetrical and have a narrow width and a long hole is formed in the center of the wide middle part.
Movable contacts 18a, 18b with stepped bending and wire rods
The main body can be made smaller by forming the spring receiver 17 as a synthetic resin molded product so that the blank length of the movable contact piece can be shortened and a predetermined deflection length can be obtained. In addition to contributing to this process, it is also possible to reduce costs by shortening machining time.

〔Effect of the invention〕

According to this invention, a process is adopted in which the movable contact piece is made into a product by successive operations in a press mold, and the function of holding the movable contact piece in the smallest possible area is achieved by making the spring holder a molded product of synthetic resin. By having this, it is possible to provide a method for manufacturing a contact device that is compact and requires significantly shortened processing time.

[Brief explanation of drawings]

1 to 5 show an embodiment of the method for manufacturing a contactor device according to the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a horizontal sectional view, and FIG. 3 is a partially sectional plan view. , Fig. 4 is an exploded perspective view of the main part, Fig. 5 is a diagram explaining the manufacturing process of the main part (movable contact piece 15), and Figs. 6 to 10 show an example of a conventional method of manufacturing a contact device. 6 is a vertical sectional view, FIG. 7 is a horizontal sectional view, FIG. 8 is a partially sectional plan view, FIG. 9 is an exploded perspective view of the main part, and FIG. 10 is the main part (movable contactor). 5)
It is a figure explaining the manufacturing process of. 2a, 2b... fixed contact, 4... contact support, 4a... square hole, 6... contact support, 13a,
13b... Fixed contact, 15... Movable contact, 15
a...Long hole, 15b...Protrusion, 17...Spring holder,
17c...dent, 17e...cervix, 17f...
Leg pieces, 18a, 18b...movable contacts.

Claims (1)

[Claims] 1. A fixed contact whose terminal is extended and arranged on the same axis at a predetermined interval, each having a fixed contact in a pair, and a fixed contact at one end that is guided so as to be able to reciprocate between the fixed contacts. a contact support having a square hole penetrating along the axis of the square hole, the other end of which is connected to the drive device; and a contact support that is pressed by a contact spring via a spring receiver on the other end side of the square hole, and has the fixed contact at both ends. In the method of manufacturing a contactor device comprising a movable contact piece having a movable contact that can be brought into and out of contact, the spring receiver is placed at the center inside the top side of the gate shape that can be engaged so as to straddle the side of the other end. A recess is molded from a synthetic resin in which both leg pieces are integrated through a narrow neck, and the movable contact piece is fitted into the elongated hole on the axis line and the recess so as to sandwich the neck from both sides of the spring receiver. A method for manufacturing a contact device, characterized in that a movable contact is fixed by cutting a wire, and after press molding, the contact device is divided into two by cutting along an axis toward a long hole from both sides.