JPH0421236Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a two-point break type electromagnetic contactor, in particular to improving the detachability of a movable contactor with high contact pressure.

[Prior art]

In general, the movable contact of a two-point break type electromagnetic contactor is supported in pressure contact with the movable part by the tension of a spring provided on the movable part, and the movable contact is held in contact with the movable part to prevent it from falling off the movable part. The protrusion of the movable contact support part, which is in contact with the upper surface of the container, is fitted into the hole of the movable contact.

[Problem that the invention attempts to solve]

Conventional electromagnetic contactors have the above-mentioned configuration, so when the movable contact is to be attached or detached for reasons such as wear or inspection of the movable contact, the movable contact must be removed by applying a force that resists the tension of the spring. It is necessary to remove the protrusion of the movable contact supporting part that is inserted into the hole of the contact. Especially in large electromagnetic contactors, the force resisting the tension of the spring is several kilograms or more. It was difficult to attach and detach manually.

[Means for solving problems]

The electromagnetic contactor according to this invention has a pair of pieces facing each other in a movable contact support part that presses the movable contact with the tension of a spring, and a through hole is provided in these pieces. It is.

[Function] The movable contact support part of this invention is such that a rod-shaped object, such as a screwdriver, is inserted into a through hole provided in a pair of opposing pieces, and a support is interposed on the tip side of the rod-shaped object. By lifting the other end using the support as a fulcrum, a force to resist the tension of the spring is obtained by applying a screw using the support as a fulcrum, and the protrusion of the movable contact supporting part is removed from the hole of the movable contact. , and attach/detach the movable contact.

[Example of idea]

An embodiment of this invention will be described below with reference to FIGS. 1 to 4. Figure 1 is an exploded view of parts surrounding the movable contact, Figure 2 is a side sectional view of the electromagnetic contactor, Figure 3 is a sectional view taken along line A-A in Figure 2, and Figure 4 shows how to attach and remove the movable contact. This is a side sectional view for explaining, and in the figure, 1 has two contacts 2 and the contacts 2 are joined at both ends in the longitudinal direction, and has a hole 17 in the center on the opposite side from the joining surface of the contacts 2. A movable contact consisting of a base metal 3; 4 a fixed contact consisting of a contact 5 facing the contact 2; and a base metal 6 joining the contact 5; 7 a base for fixedly supporting the fixed contact 4; ,
8 is a cross bar that slidably supports the movable contact 1 and is slidably moved on the base 7 by an electromagnet (not shown); 9 is the cross bar that supports the movable contact 1;
10 is a leg of the cross bar 8 which is disposed between the two fixed contacts 4 and has a space in which the spring 9 is housed; 11 is a tip of the leg 10; The movable contact 1 is provided with a base metal 3 on the surface to which the contact 2 of the movable contact 1 is joined, and
A top plate portion 12 of the leg portion 10 that supports one end of the spring 9;
13 is a U-shaped movable contact support having through holes 16 at both ends, and 14 is a support for one end of the spring 9. The flat plate portion of the movable contact support 13 constitutes a spring receiving portion. 15 is a pair of parallel plates of the movable contact support 13 that passes on both sides of the spring 9, passes through the through hole 12 of the top plate portion 11 of the cross bar 8, and further covers the short side of the movable contact 1; 9, the movable contact 1 is moved to the top plate 1 of the crossbar 8.
The movable contact holder 1 is brought into contact with the movable contact support 13, and is combined with the movable contact support 13 to form a substantially mouth-shaped movable contact support portion. 19 is a flat plate portion that comes into contact with the movable contact 1, and constitutes a movable contact receiving portion. 20 is a protrusion provided on the flat plate part 19 that is inserted into the hole 17 of the base metal 3, and 21 is a pair of parallel latching protrusions extending perpendicularly from both sides of the flat plate part 19 to support the movable contact. The pair of parallel plates 15 of 13 are elastically deformed outward and the movable contact holder 18 is inserted between the parallel plates 15, and then the elastic deformation of the parallel plates 15 is removed and the pair of movable contact holders 18 are latched. The protruding piece 21 is inserted into the pair of through holes 16 of the parallel plate 15 of the movable contact support 13.
By penetrating the movable contact support 13 and the movable contact presser 18, a mouth-shaped movable contact support portion is constructed. 22 is the flat plate part 1
A pair of parallel bent pieces 23 extend perpendicularly from the other sides of 9, and 23 is a pair of through holes provided in the pair of bent pieces 22. This corresponds to the arrangement direction of the two contacts 2 of 1.

In this embodiment, the movable contact support portion is constituted by a movable contact support 13 and a movable contact presser 18, but the movable contact support 13 may be configured as disclosed in Japanese Utility Model Publication No. 57-3169, for example. composition,
That is, if the movable contact support itself has a spring receiving part and a movable contact receiving part, and the movable contact support part is configured only by the movable contact support,
It is not necessary to provide the movable contact holder 18 of the above embodiment separately from the movable contact support 13, and in the above embodiment, the flat plate portion 14 of the approximately U-shaped movable contact support 13 is different from that of the above embodiment. Conversely, the parallel plate 15 is inserted into the through hole 12 of the top plate portion 11 of the cross bar 8 so as to be located outside the cross bar 8, and the movable contact holder 18 is inserted into the movable contact inside the cross bar 8. Needless to say, when engaged with the support 13, the flat plate portion 14 of the movable contact support 13 constitutes a movable contact holder, and the movable contact holder 18 constitutes a spring receiving portion.

In these cases, it goes without saying that the bent piece 22 and the through hole 23 are formed in the portion of the movable contact support 13 located outside the cross bar 8.

The electromagnetic contactor according to this invention is constructed as described above. Next, a method for attaching and detaching the movable contactor 1 will be explained with reference to FIG. The driver 24 is passed through the pair of through holes 23 of the movable contact holder 18, and a suitable support 26 is placed on the base 7 on the tip 25 side of the driver 24. Then, by pushing up the handle 27 of the driver 24 against the tension of the spring 9 and using the support 26 as a fulcrum in the direction of arrow F, the movable contact presser 1 inserted into the hole 17 of the movable contact 1
The movable contact 1 is attached and detached by removing the protrusion 20 of 8.

In the above embodiment, the driver 24 is used to apply a force that resists the tension of the spring 9. However, if the driver 24 is strong and can be inserted into the through hole 23 of the movable contact holder 18, the driver 24 may be used. It is not limited to.

[Effect of idea]

As described above, according to this invention, the movable contact support part that presses the movable contact with the tension of the spring,
By providing a pair of opposing pieces and providing a through hole in the pieces, an electromagnetic contactor can be obtained in which the movable contact can be easily attached and detached.

[Brief explanation of drawings]

Fig. 1 is an exploded assembly view of the movable contact peripheral parts of an electromagnetic contactor according to an embodiment of this invention, Fig. 2 is a side sectional view of an electromagnetic contactor according to an embodiment of this invention, and Fig. 3 FIG. 4 is a sectional view taken along the line AA in the figure, and a side sectional view illustrating the attachment and detachment of the movable contactor according to this invention. In the figure, 1 is a movable contact, 2 is a contact, 3 is a base metal, 8 is a cross bar, 9 is a spring, 13 is a movable contact support, 18 is a movable contact holder, 20 is a protrusion, and 21 is a protrusion piece , 22 is a bent piece, and 23 is a through hole. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A cross bar having a spring storage space with one end closed by a top plate, and a movable cross bar having a substantially square shape, with a spring receiving part located in the space of the cross bar and facing the spring receiving part. A movable contact whose both sides connecting the spring receiving part and the movable contact receiving part are loosely inserted into through holes formed in the top plate part of the cross bar so that the contact receiving part is located outside of the cross bar. a support part, a movable contact interposed between a movable contact receiving part located outside the crossbar of the support part and a top plate part of the crossbar, and a movable contact inserted into the space of the crossbar; A spring that is arranged to be interposed between the spring receiving part located inside the cross bar of the movable contact support part and the top plate part of the cross bar, and presses the movable contact towards the top plate part of the cross bar. In an electromagnetic contactor comprising:
A pair of pieces are attached to the movable contact receiving portion located outside the crossbar of the movable contact supporting portion so as to be substantially perpendicular to the longitudinal direction of the movable contact and substantially perpendicular to the movable contact surface. An electromagnetic contactor characterized in that these pieces are provided facing each other and have through-holes formed in these pieces, respectively, through which rod-shaped tools facing each other can pass.