JPH0222908Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a mechanical interlocking device for an electromagnetic contactor.

[Technical background of the invention and its problems]

For example, when performing reversible operation of a motor using two electromagnetic contactors, these two electromagnetic contactors must be In addition to the electrical interlocking device, it is common to provide a mechanical interlocking device between the two. By the way, recently there have been many cases in which three magnetic contactors are used to switch between a regular power source and two emergency power sources, but in this case, two or three magnetic contactors are used at the same time. In order to prevent the door from closing, mechanical interlocking devices are becoming necessary in addition to electrical interlocking devices. Conventionally, such a case has been dealt with by using two electromagnetic contactors each having a mechanical interlocking device between them. However, in this one, 2
There were problems in that the mechanical interlocking between the tables could not be completely achieved, and the overall size increased.

[Purpose of invention]

The present invention was developed in view of the above circumstances, and its purpose is to provide an electromagnetic contactor that can ensure mechanical interlocking between three electromagnetic contactors and that can also reduce the overall size. It is to provide interlocking devices.

[Summary of the idea]

In order to achieve the above object, the present invention is provided between each movable contact base of three electromagnetic contactors arranged in parallel on a common base, and the movable contact of one of the adjacent movable contact bases is two first blocking members that are displaced to a position where they block the movement of the other movable contact base in response to movement of the base; and two first blocking members that correspond to the movable contact bases at both ends of the movable contact bases and that They are connected by a lever, and the one on one end receives the movement of one of the movable contact bases at both ends, and the one on the other end moves the other movable contact base via the lever. and a pair of second blocking members that are displaced to a position that blocks movement of the table, and when one end of the three electromagnetic contactors is closed, The first blocking member prevents movement of the central movable contact base, the second blocking member prevents movement of the movable contact base at the other end, and the central electromagnetic contactor is closed. This case is characterized in that two first blocking members attempt to prevent the movement of each movable contact base at both ends.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 1, reference numeral 1 denotes a common base, and fixed guides 2 and 3 are erected at both ends of the upper surface 1a. Reference numerals 4, 5, and 6 indicate three electromagnetic contactors with the same configuration, which are located between the fixed guides 2 and 3 and arranged in parallel at equal intervals on the common base 1. The contactor 4 will be described as a representative. 7 is a fixed core housed in case 8,
This is fixed on the common base 1 via a case 8. 9 is a coil fitted into the fixed iron core 7. Reference numeral 10 denotes a fixed contact stand provided with a fixed contact (not shown), and is provided on the case 8. Reference numeral 11 denotes a movable contact base equipped with a movable contact (not shown) corresponding to the fixed contact.
It is possible to move up and down in the figure with respect to 0,
A movable iron core 12 is fixed to the lower protrusion 11a by a pin 13 in a state facing the fixed iron core 7.
A return spring (not shown) is disposed between the movable contact base 11 and the case 8, and this return spring causes the movable contact base 11 to
is always urged upward together with the movable iron core 12. 14 and 15 are two first rollers which are two first blocking members, and among these, the left first roller 14 is connected to the movable contact base 11 at the left end and the movable contact base 11 at the center. The first roller 1 on the right located between
5 is located between the movable contact base 11 at the right end and the movable contact base 11 at the center, and is movable in the horizontal direction in the figure on roller supports 16 and 17 fixed between the cases 8 and 8. It is provided. These first rollers 14 and 15 are pressed by the protrusion 11a of one of the adjacent movable contact bases 11 and 11 when the movable contact base 11 moves downward. and the other movable contact base 11
The movable contact base 11 is displaced so as to enter below the protrusion 11a of the movable contact base 11, thereby preventing the other movable contact base 11 from moving downward. On the other hand, reference numeral 18 denotes a substantially U-shaped lever, in which the horizontal part 18a is located below the upper surface 1a of the common base 1, and the left and right rising parts 18
b, 18b pass through the through holes 19, 19 in the upper surface 1a and are located on the sides of the electromagnetic contactors 4, 6 at both the left and right ends, and two wires are provided laterally in each rising portion 18b, 18b. Guide pins 20, 20 protruding from each other pass through the fixed guides 2, 3, respectively, and are slidably supported by these fixed guides 2, 3.
This lever 18 is movable in the left and right direction. Reference numerals 21 and 22 are part of second rollers constituting a pair of second blocking members.
Of these, the second roller 21 on the left end side is located diagonally below and to the left of the protrusion 11a of the left end movable contact base 11, and the second roller 22 on the right end side is supported rotatably around the center. is located diagonally below and to the right of the protrusion 11a of the rightmost movable contact base 11. Thus, when one of the movable contact bases 11, 11 at both ends of the pair of second rollers 21, 22 moves downward, the one at one end moves the movable contact base 11. protruding part 1
1a, the other end side is displaced via the lever 18 so as to enter below the protrusion 11a of the other movable contact base 11, and thus the other movable contact base 11 It is designed to prevent the downward movement of

Next, the operation of the above configuration will be explained. First, in the state shown in FIG. 1 where none of the three electromagnetic contactors 4 to 6 are closed, for example, the leftmost electromagnetic contactor 4
When the coil 9 is energized, the fixed iron core 7 is excited, and the movable iron core 12 is attracted to the fixed iron core 7, so that the movable contact base 11 moves downward against the biasing force of the return spring. As shown in the figure, the movable core 12 is attracted and held by the fixed core 7, and the movable contacts of the movable contact base 11 contact the fixed contacts of the fixed contact base 10 to close the circuit. In addition, as the movable contact base 11 moves downward during this folding, the left first roller 14 is pressed and displaced to the right by the protrusion 11a of the movable contact base 11, and the lower end of the protrusion 11a of the central movable contact base 11 is moved. At the same time as coming into contact with the
As the left second roller 21 is pressed and displaced to the left, the right second roller 2 is moved via the lever 20.
2 is displaced to the left and comes into contact with the lower end portion of the protruding portion 11a of the movable contact base 11 at the right end. Therefore, in the state shown in FIG. 2, the movable contact base 11 of the center electromagnetic contactor 5 is prevented from moving downward by the left first roller 14, and the rightmost electromagnetic contactor 5 is prevented from moving downward. The movable contact base 11 at 6 is prevented from moving downward by the second roller 22 on the right. The operation described above is exactly the same when the rightmost electromagnetic contactor 6 is first closed in the state shown in FIG.

On the other hand, if the coil 9 of the center electromagnetic contactor 5 is first energized in the state shown in FIG. The movable contact base 11
The fixed core 12 also moves downward, as shown in Figure 3.
is attracted and held by the movable iron core 7, thereby closing the circuit. In addition, as the movable contact base 11 moves downward during this folding, the left first roller 14 is pressed and displaced to the left by the protrusion 11a of the movable contact base 11, and the lower end of the protrusion 11a of the left end movable contact base 11 is At the same time, the right first roller 15 is pressed and displaced to the left, and comes into contact with the lower end of the protrusion 11a of the rightmost movable contact base 11. Therefore, in the state shown in FIG. 3, the left end movable contact base 11 is lowered by the left first roller 14, and the right end movable contact base 11 is lowered by the right first roller 15. Movement to is prevented.

In any of the above cases, if the coil 9 of the closed electromagnetic contactor is cut off, the movable contact base 1
1 is returned upward by the spring force of the return spring, the closure is released, and the state shown in FIG. 1 is returned.

[Effect of idea]

As is clear from the above description, in the present invention, when one of the three electromagnetic contactors is in the closed state,
It is possible to reliably prevent the movement of the other two movable contact blocks, that is, to reliably prevent the closing operation, and thus to reliably perform mechanical interlocking between the three electromagnetic contactors. Also, since three electromagnetic contactors are arranged side by side on a common base and mechanically interlocked between them, a mechanical interlocking device is provided between the two electromagnetic contactors. Compared to the conventional method, which required the use of two devices, the installation space is reduced and the overall size can be made smaller, which is an excellent effect.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of the entire device, and FIGS. 2 and 3 are views corresponding to FIG. 1 showing different operating states. In the drawing, 1 is a common base, 4, 5, and 6 are electromagnetic contactors, 11 is a movable contact base, 14 and 15 are first rollers (first blocking members), 18 is a lever, 19,
20 is a pair of second rollers (second blocking members).

Claims (1)

[Scope of utility model registration request] Three electromagnetic contactors are arranged in parallel on a common base and each has a movable contact base, and one of the adjacent movable contact bases is provided between each of the movable contact bases of the electromagnetic contactor. two first blocking members that are displaced to a position where they block movement of the other movable contact base in response to movement of the movable contact base; and corresponding to the movable contact bases at both ends of the movable contact base. They are connected to each other by levers, and as the one on one end receives the movement of one of the movable contact bases at both ends, the one on the other end moves from the other movable contact base through the lever. a pair of second contacts that are displaced to a position that prevents movement of the movable contact base;
An interlocking device for an electromagnetic contactor, comprising a blocking member.