JPS6217961Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of a movable contact support device for a switch which facilitates attachment and detachment of the movable contact. Conventionally, in a movable contact support structure such as an electromagnetic contactor in which a movable contact is mounted together with a contact spring in a window hole of a movable contact support, the contact spring is compressed with a fingertip or tweezers when the movable contact is attached or detached. As the capacity of the contactor, etc. increases, the pressure of the contact spring also increases.
It was extremely difficult to attach and detach the movable contact.

The present invention solves this problem, and one embodiment thereof will be described below with reference to the drawings.

In Figures 1 to 3, 1 is a movable contact support, 2 is a window hole for mounting the movable contact, and the upper wall 1a has both ends cut out to have a smaller depth than both side walls 1b. There is. 3 is a spring receiver formed by bending a band-shaped metal plate of a predetermined width into a rectangular ring shape;
Central side portion 3a located above the upper wall portion 1a of the window hole
and both sides 3b bent downward from both ends of the central side and extending along both end openings of the window hole 2,
3b, and an upper wall portion 1a of the window hole which is bent inward from the tips of both sides and extends into the window hole 2, and between the tips of the upper wall portion 1a of the window hole.
It is made up of two end sides 3c, 3c having a gap g somewhat larger than the thickness t, and can freely rotate around the upper wall 1a of the window hole. Reference numeral 4 designates a contact spring stretched between both end sides 3c, 3c of the spring receiver and the upper wall 1a of the window hole. 5
It is an auxiliary metal fitting that is placed over the end of the spring receiver 3 on the side 3c side, and the spring is inserted into the holes 6, 6 provided in the side parts 5a, 5a, which are opposite to the outside of the both sides 3b, 3b of the spring receiver. The protrusions 7, 7 provided on both sides 3b, 3b of the receiver are engaged to prevent the auxiliary fitting 5 from falling off, and the side walls 1b, 1b of the window hole are prevented from falling off.
Both sides 5b, 5b facing the inside of the window are extended to both sides so as to cover the side ends of the above-mentioned both sides 5a, 5a, so as to smoothly slide on both side walls 1b, 1b of the window hole. It is set as. A movable contact 8 is held between this auxiliary metal fitting 5 and the bottom wall 1c of the window hole by the force of a contact spring 4. The movable contact has both ends protruding from the window hole 2 that are wider than the central portion inside the window hole, and its stepped portions 8a engage with both side edges of the window hole 2 to prevent it from slipping in the longitudinal direction. is being carried out.

When assembling, the spring receiver 3 is first engaged with the upper wall portion 1a of the window hole through the gap g between its edges, and then the spring receiver is inserted into the upper wall portion 1a of the window hole as shown in FIG. Rotate 180 degrees with respect to the normal position shown by the solid line in Figure 1 so that the end sides 3c, 3c are on top, and adjust the distance _L2 between the end sides 3c, 3c and the upper wall 1a of the window hole to the normal position. The contact spring 4 is inserted between the edge portions 3c, 3c of the spring receiver and the upper wall portion 1a of the window hole in a state where the distance is larger than the distance L ₁ at the time. Since this distance _L2 can be made close to the free length of the contact spring 4, insertion of the contact spring is easy. Next, when the auxiliary metal fitting 5 is placed over the end of the spring receiver 3 on the end side 3c side, the protrusions 7, 7 on both sides of the spring receiver are elastically inserted into the holes 6, 6 on both sides of the auxiliary metal fitting at a predetermined position. to prevent it from falling off.

After that, the movable contact 8 is inserted into the bottom of the window hole 2, and if the tip of the spring receiver 3 is pushed in the direction of arrow A against the tension of the contact spring 4, the base end of the spring receiver 3 is pushed. The contact spring 4 rotates in the same direction using the contact portion with the window hole upper wall portion 1a as a fulcrum, and the contact portion of one end of the contact spring 4 with the window hole upper wall portion 1a rotating together with the contact spring 4 gradually rotates in the rotating direction. When the spring receiver 3 has rotated 90 degrees from the original position, one end of the contact spring 4 comes into contact with the end surface of the upper wall 1a of the window hole, as shown by the dotted line in FIG. I settled on. If it is further rotated in the same direction from this state, it will elastically settle into the state shown by the solid line in FIG. 1, and the assembly will be completed.

Also, if you want to replace the movable contact 8 because the contact has worn out due to long-term use, push the lower end of the spring receiver 3 in the direction of arrow B in Figure 1. The spring receiver 3 is held by the force of the contact spring 4 as shown by the dotted line, and in this state, the movable contact 8 can be replaced with a new one and the spring receiver 3 can be returned to its original position.

In the embodiment described above, the gap g between the edge portions of the spring receiver 3 is formed to be somewhat larger than the thickness t of the upper wall portion 1a of the window hole, but both sides 3b of the spring receiver,
If the tip of the window 3b can be easily opened to the left and right against its elastic force, the gap g may be smaller than the thickness t of the upper wall of the window hole.

As explained above, the present invention allows the contact spring and the movable contact to be attached and detached easily and quickly by using the force of the contact spring without being bothered by the force of the contact spring. It is also convenient to use. Moreover, it is structurally simple and can be constructed at low cost.

Further, according to the present invention, since the contact spring 4 is isolated from the contact portion by the spring receiver 3 and the auxiliary fitting 5, it is possible to prevent the contact spring 4 from being damaged by the arc that occurs when the contact is opened, and the movable contact 8 Since the heat is transmitted to the auxiliary metal fitting 5 and the spring receiver 3 and radiated, there is an advantage that the temperature rise can be reduced.

Especially in this invention, since the auxiliary metal fitting 5 is provided,
It is possible to eliminate the following problems that would occur if this was not provided.

1. Without the auxiliary metal fitting 5, when the force of the contact spring 4 is strong, the tips of both sides of the spring receiver 3 will open as shown by the chain lines in FIG. There is a risk that it will deviate from 3c.

2. Without the auxiliary metal fitting 5, the position of the contact spring 4 is likely to shift, and especially when the spring receiver 3 is rotated, there is a risk that the contact spring will come off the spring receiver and fly out.

3 If there is no auxiliary metal fitting 5, the edge part 3 of the spring receiver
Since the side end portions of c and 3c slide on the inside of the side wall portion 1b of the window hole, the inside side wall portion of the window hole is likely to wear out, and contact failure is likely to occur due to wear powder.

4 Without the auxiliary metal fitting 4, the edge part 3c of the spring receiver,
Since the tip side of 3c locally contacts the movable contact 8, the contact portion of the movable contact 8 is worn out, and the portion located between the end sides 3c remains unworn and protrudes. This protrusion prevents the spring receiver 3 from rotating.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view showing a movable contact support device according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a perspective view showing a state in which a contact spring is attached. 1; Movable contact support, 1a; Upper wall portion, 1b;
Side wall portion, 1c; Bottom wall portion, 2; Window hole, 3; Spring receiver, 3a; Center side portion, 3b; Side portion, 3c; End portion, 4; Contact spring, 5; Auxiliary fittings, 5a, 5b ;
Side part, 6; hole, 7; protrusion, 8; movable contact.

Claims (1)

[Scope of utility model registration request] A central side portion located above the upper wall of the window hole of the movable contact support; both side portions bent downward from both ends of this central side portion and extending along both end openings of the window hole; A spring receiver that is bent inward from the tips of both sides and extends into the window hole, the tips of which are intersected by the opposite edges at a distance, and between both ends of the spring receiver and the upper wall of the window hole. A contact spring is stretched over the spring receiver, and the contact spring is placed over the end side of the spring receiver, and both side edges opposite to the outer sides of both sides of the spring receiver are in uneven engagement with both side edges of the spring receiver. The window hole is prevented from coming off, and both sides facing the inside of both side walls of the window hole are provided with auxiliary metal fittings that slide smoothly on both side walls of the window hole.
A movable contact is held between the auxiliary metal fitting and the bottom wall of the window hole by the force of the contact spring, and when the spring receiver is attached with the contact spring and the auxiliary metal fitting, the movable contact is held between the auxiliary metal fitting and the bottom wall of the window hole. A movable contact support device for a switch that can be rotated around.