JPS6244410Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an interlock device for a magnetic contactor.

Two electromagnetic contactors are used to control the normal rotation of motors, etc.
When switching the reverse direction, when one electromagnetic contactor performs a closing operation, it is necessary to prevent the other electromagnetic contactor from closing. An example of a known mechanical interlock device for this purpose will be explained with reference to FIG.
That is, the forward rotation side electromagnetic contactor 1 and the reverse rotation side electromagnetic contactor 2 are attached to a common base 3, and a mechanical interlock device 4 is attached in an adjacent space. This interlock device 4 has a lever 7 attached to a fulcrum 6 provided on a pedestal 5, and both ends of the lever 7 are inserted under the movable contact supports 12 of the electromagnetic contactors 1 and 2, respectively. 8 is a screw for mounting the pedestal. The electromagnetic contactors 1 and 2 each include a fixed core 10 having a coil 9 and a movable core 14 connected by a core pin 13 to a movable contact support 12 supported by a return spring 11.

In this configuration, when one electromagnetic contactor 1 performs a closing operation (that is, the movable core 14 descends), the lever 7 rotates clockwise in the figure, and the tip of the lever 7 contacts the movable contactor of the other electromagnetic contactor 2. While holding down the child support 12, move the movable core 14 of this other electromagnetic contactor 2.
and prevents the movable contact support 12 from moving in the closing direction. That is, the lever 7 acts as a support rod to lock the electromagnetic contactor 2. Here, assuming that the opening of the magnet parts of both electromagnetic contactors is dimension A, when the movable contact support 12 and the lever 7 are at the solid line position in the figure, the distance between them is half of dimension A, and one movable core 14 As soon as touches a certain fixed core 10,
Since one end of the lever 7 is brought into contact with the lower surface of the other movable contact support 12, half of dimension A is play. Therefore, the overall height of the electromagnetic contactors 1 and 2 increases, which is uneconomical. Also, the mounting position of the lever 7 should be set to A with respect to the A dimension of the opening of the magnet part.
In order to adjust the dimensions to half, the mechanical interlock device 4 requires a pedestal 5, a fulcrum 6, a lever 7,
There are 4 types of screws for mounting the pedestal, and the dimensional and assembly errors of each of these parts are very large, so it is not easy to secure half of the opening A dimension of the magnet part, and it takes time to manufacture and assemble the parts. It becomes uneconomical.

The present invention was developed in view of the above circumstances, and is arranged between two magnetic contactors installed in parallel, and when one magnetic contactor closes, the other magnetic contactor closes. As a mechanical interlock device for an electromagnetic contactor, a window is provided in the moving area of the movable contact support in adjacent parts of both electromagnetic contactors so that a part thereof covers the arrangement area of the movable contact support when the contactor is not in operation. Then, a rectangular frame-shaped roller support is fitted here, and the opening area of this roller support is narrowed so that a part of the opening area of this roller support is covered by the movable contact support in the non-operating position. A roller with a diameter larger than the opening size is provided in a free state to prevent it from falling out from within the roller support while maintaining the free state, and the adjacent spacing between both electromagnetic contactors is such that the circumferential side of the roller is close to both movable contactors. By having a dimension that protrudes into the movement area, when one of the movable contact supports moves during the excitation operation, the movable contact supports push the movable contact supports so that the movable contact supports of the other electromagnetic contactor protrude into the movement space. By configuring the movable contact support to prevent movement of the other electromagnetic contactor, during the closing operation of one electromagnetic contactor, the roller is moved by the movable contact support, etc., and the movable contact support, etc. of the other electromagnetic contactor is moved. It is an object of the present invention to provide a more compact and more economical electromagnetic contactor interlock device by mechanically locking the contactor, thereby eliminating the above-mentioned drawbacks.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. As shown in FIG. 2, the forward rotation side electromagnetic contactor 1 and the reverse rotation side electromagnetic contactor 2 are attached to a common base 3, and a mechanical interlock device 4A is attached in an adjacent space. This mechanical interlock device 4A has a roller 15 as shown in FIG. 4 below the movable contact support 12 as indicated by the solid line in the figure, and a roller support 16 as shown in FIG.
is held between the forward rotation side electromagnetic contactor 1 and the reverse rotation side electromagnetic contactor 2 to support the roller 15. That is, as in FIG. 1, two electromagnetic contactors 1 and 2 are arranged side by side on a base 3. The electromagnetic contactors 1 and 2 are provided with windows W positioned below the movable contact support 12 and facing each other. A rectangular frame-shaped roller support 16 as shown in FIG. 3 is fitted into this window W portion, and a roller 15 is disposed within this roller support 16 so as to be movable in the direction of both windows W. The length of the roller support 16 is made smaller than the diameter of the roller 15, and the end of the roller 15 inside the roller support 16 protrudes from the roller support 16. Therefore, the roller 15 is pushed and moved when its end touches the movable contact support 12. Further, the position of the window formed by the roller support 16 is such that a part thereof covers the arrangement area of both movable contact supports 12 when not in operation, as shown in FIG. The aperture size of the roller support 16 is narrowed somewhat.
This prevents the roller 15 from falling off from inside.
In this configuration, when the roller 15 is in the solid line position shown in FIG. 2, when one of the electromagnetic contactors 1 performs the closing operation (that is, the movable core 14 descends), the movable contact support 12 also descends and is pushed by its side surface. The roller 15 moves to the dashed line position, pops out into the other electromagnetic contactor 2 by the amount of pressure, and enters under the movable contact support 12 of the other contactor 2. Therefore, the movement of the movable core 14 and the movable contact support 12 of the electromagnetic contactor 2 in the closing direction is obstructed and prevented by the roller 15. When the electromagnetic contactor 1 is deenergized, its movable contact support 12 rises and returns to the position of the roller 15.
Since the pressure on the roller 15 is released, the roller 15 becomes movable, and when the electromagnetic contactor is closed, this electromagnetic contactor 2
The movable contact support 12 is lowered to push the roller 15 toward the electromagnetic contactor 1 and similarly prevent the movable core 14 of the electromagnetic contactor 1 and the movable contact support 12 from moving in the closing direction.

Therefore, according to the present invention, the opening A of the magnet part is
Since the distance between the movable contact support 12 and the roller 15 is not directly related to the dimensions, and there is no need to provide a distance that is half of the A dimension, the overall height of the electromagnetic contactor is reduced, allowing for miniaturization. In addition, the mechanical interlock device requires only a roller and a roller support, and has a simple structure in which the roller is pushed out by a movable contact support and the other movable contact support is prevented from moving, so there is no possibility of component errors or assembly. The influence of errors is reduced, parts manufacturing and assembly are facilitated, and an economical and highly reliable electromagnetic contactor with mechanical interlock can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the configuration of a conventional device.
FIG. 2 is a structural diagram showing an embodiment of the present invention, and FIG. 3 is a perspective view of a roller receiver showing an embodiment of the present invention.
FIG. 4 is a perspective view of a roller showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Forward rotation side electromagnetic contactor, 2...Reverse rotation side electromagnetic contactor, 3...Base, 4A...Mechanical interlock device, 5...Band, 6...Fully point, 7...Lever, 8 ... Screw for mounting pedestal, 9 ... Coil, 10
... Fixed core, 11 ... Return spring, 12 ...
...Movable contact support, 13...Core pin, 14...
Movable core, 15...roller, 16...roller support.

Claims (1)

[Scope of utility model registration request] Preventing the simultaneous closing of two magnetic contactors arranged side by side, each having a variable contact support that is normally biased to one side due to biasing force and moved to the other side by the driving force received by excitation operation. In this interlock device, a window is provided in the movable contact support moving area of the adjacent portions of both electromagnetic contactors so as to partially cover the arrangement area of the movable contact support when inactive, and a rectangular frame is provided here. A roller support having a shape is fitted so that a part of the opening area of the roller support is covered by the movable contact support in the non-operating position, and the roller support opening size as seen from the movable contact movement area is inserted into the roller support. By arranging a roller of larger size in a free state and making the adjacent spacing between both electromagnetic contactors such that the peripheral side of the roller protrudes into the moving area of both movable contacts, one of the movable contacts during the excitation operation is An electromagnetic contactor characterized in that when the child support moves, when it is pushed by the movable contact support, the child support protrudes into the movement space of the movable contact support of the other electromagnetic contactor and prevents the movement of the other movable contact support. interlock device.