JPH019057Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a mechanical interlock device for a magnetic contactor.

Normal rotation of motors, etc. using two electromagnetic contactors,
When switching the reverse direction, when one electromagnetic contactor performs a closing operation, it is necessary to prevent the other electromagnetic contactor from closing.

[Prior art and its problems]

An example of a known mechanical interlock device will be explained with reference to FIG. 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 installed in the adjacent space.
Install. This interlock device 4 is
A lever 7 is attached to a fulcrum 6 provided at
It is inserted at the bottom of the . 8 is a screw for mounting the pedestal. The electromagnetic contactors 1 and 2 each have a fixed core 10 having a coil 9, a movable contact support 12 supported by a back spring 11, and a core pin 13.
The movable core 14 is connected to the movable core 14.

In this configuration, when one of the electromagnetic contactors 1 performs a closing operation (that is, when the movable core 14 descends),
The lever 7 rotates clockwise in the figure to prevent the movable core 14 and the movable contact support 12 of the other electromagnetic contactor 2 from moving in the closing direction. In other words,
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 lever 7 are in the solid line position in the figure, the distance between them is usually half of dimension A, and one movable core 14 is Since one end of the lever 7 comes into contact with the lower surface of the other movable core 12 when it comes into contact with a certain fixed core 10, 1/2 of the dimension A becomes play. Therefore, the height of the electromagnetic contactors 1 and 2 increases as a whole, which is uneconomical. Therefore, the one shown in FIG. 2 has less play in this stroke.

In the mechanism shown in FIG. 2, the movable contact support 12
A beating rod 15 is disposed on the lower surface of the case 16, and one movable contact support 12 pushes the other beating rod 15 to form a heart-shaped top 17 inside the case 16.
7a moves to one corner 16a inside the case and becomes unable to swing, so interlocking can be achieved without changing the position of the other hitting rod 15. 1
8 is a pin provided in the case, 19 is a spring provided between the piece 17 and the pin 18, and the piece 1
7 is always biased upward. Since the play due to this mechanism is the dimension B, it is sufficient to ensure a clearance equal to the component tolerance dimension. Therefore, although it is smaller than the play shown in FIG. 1, when this mechanism is used, the interlock mechanism section 20 is often installed under the base of the contactor, as shown in FIG. The height dimension C becomes large, and the installation space becomes large.

[Purpose of invention]

The present invention eliminates the above-mentioned drawbacks and provides a more compact magnetic contactor with mechanical interlock device.

[Key points of the idea]

According to the present invention, the above-mentioned object is an interlock device disposed between two electromagnetic contactors, which prevents the closing operation of the other electromagnetic contactor when one electromagnetic contactor opens. A pair of push rods are arranged inside the case so that they can move up and down with one side facing each other, and the upper and lower sides are attached to the other side of each push rod. an arm that protrudes on the same line that crosses the moving axis, and whose tips penetrate through both side walls of the case facing each of the electromagnetic contactors and are engaged with the movable contact supports of the electromagnetic contactors on both sides, respectively; A heart-shaped piece is provided in the case so as to be swingable about an axis in the same direction as the direction in which the arms of the push rods are connected, and the lower end of each push rod is connected to the shoulders at both ends of the piece. The pieces are bent in such a way that they come into contact with one of the pieces, and the pieces are swung in opposite directions by both push rods, and when either one of the push rods is pressing the piece, the other push rod moves This is achieved by configuring the device to be locked by

[Example of idea]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a cross-sectional view of a mechanical interlock device according to the present invention, taken generally from line B--B in FIG. FIG. 5 is a front view taken along line A--A in FIG. 4. The interlock device 21 has a two-part case 22, 22'. As is clear from FIGS. 4 and 5, the case 22 is made into a rectangular U-shaped cross section with one side open, and a recess 25 in the lower part of the inside of the case 22 accommodates the only heart-shaped piece 24. is formed. A shoulder portion 24a of the top 24 is in contact with a stopper portion 28 formed on the inner wall of the case 22, and another shoulder portion 24b is in contact with the tip 30 of a push rod 29 provided slidably along the longitudinal direction of the case 22. An arm portion 33 is attached to the push rod 29 and projects outward through a long hole 32 provided in the bottom wall 31 of the case 22.

The other case 22' is also made to have the same shape as the case 22. That is, inside this case 22, there is also a stopper part (not shown, but designated by reference numeral 28') at the same position as the stopper part 28 of the case 22, a recess 25' corresponding to the recess 25, and a long hole 32.
A long hole 32' corresponding to the push rod 2 is provided.
A push rod 29' corresponding to 9 is placed. However, the stopper part 28' comes into contact with the shoulder part 24b of the top 24, and the tip of the push rod 29 comes into contact with the shoulder part 24a. However, these cases 22, 22'
are stacked with their open sides sandwiching the only piece 24 which has a considerable thickness. In addition, frame 24
You can also split it into two pieces. The pieces 24 disposed in the recesses 25, 25' are always urged upward by a spring 27 installed between the pieces 24 and a common pin 26 fixed to the cases 22, 22'. However, the movement of the top 24 is suppressed by the shoulder 24a hitting the stopper 28 and the shoulder 24b hitting the stopper 28'. The interlock device 21 having such a configuration is disposed between the electromagnetic contactors 1 and 2, and the arm portions 33 and 33' provided on the push rods 29 and 29' are connected to the electromagnetic contactors 1 and 2, respectively.
For example, as shown in FIG. 7, the movable part 2 is directly coupled to a movable contact support 12, 12'.
In addition, 36 is the stand of the interlock device 21, and 37 is the stand of the interlock device 21.
is a mounting screw, and by changing the height of the stand 36, the vertical position of the interlock device 21 can be changed.

In FIG. 7, if the electromagnetic contactor 2 performs a closing operation, the arm portion 33 is lowered by the downward movement of the movable contact support 12, and the tip 30 of the push rod 29 is applied to the heart-shaped contactor 2. The piece 24 is moved, and as shown in FIG.
Head toward the inner corner 34 side. However, the top 24c
If it fits into the corner 34, the top 24 becomes unable to swing, and the other push rod 29' becomes inoperable.
The electromagnetic contactor 1 is locked. When the electromagnetic contactor 2 performs an opening operation, the force of the spring 27 causes the top 2 to open.
4 will return. Further, when the electromagnetic contactor 1 performs a closing operation, the top portion 24c of the top 24 fits into the corner 35, thereby locking the electromagnetic contactor 2. If two magnetic contactors are excited at the same time for some reason,
Piece 2 is moved by the push rod of whichever moves first.
4 can be rotated to nullify the operation by the other push rod.

If the two electromagnetic contactors have different sizes, that is, if the stroke dimensions D of the movable cores are different, the E and F dimensions in the case on each electromagnetic contact side should be adjusted appropriately as shown in Figure 8. Just set it.
In this case, various dimensions inside the case 22 and inside the case 22' will be different.

[Effects of the invention] As explained above, according to the invention, a compact mechanical interlock device is obtained by storing a pair of push rods and a heart shape in a two-piece case to form a unit. In addition, the arms provided on each push rod are positioned on the same line as the direction that crosses the axis of movement in which each push rod moves up and down, and the heart-shaped piece is also placed in the same direction as the line connecting the arms. By arranging the contactor so as to be able to swing around the axis of the contactor, the width of the mechanical interlock device can be reduced, and there is no need to modify the electromagnetic contactor itself.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a state in which a conventional mechanical interlock device is installed in two electromagnetic contactors.
Fig. 2 is a sectional view of a conventional mechanical interlock device different from Fig. 1, Fig. 3 is a schematic side view showing the state in which the interlock device of Fig. 2 is installed in two electromagnetic contactors, Figure 4 is a sectional view of the mechanical interlock device according to the present invention, and Figure 5 is a cross-sectional view of the mechanical interlock device according to the present invention.
6 is a partial front view in a state different from that shown in FIG. 5; FIG. 7 is a longitudinal section showing a state in which the mechanical interlock device according to the present invention is incorporated into two electromagnetic contactors. 8 is a front view corresponding to FIG. 6 of another example of the mechanical interlock device according to the present invention. 1 and 2 are electromagnetic contactors, 12 is a movable contact support,
21 is an interlock device, 22 and 22' are a case, 24 is a top, 25 and 25' are recesses, 27 is a spring, 28 is a stopper part, 29 and 29' are push rods, and 33 and 33' are arm parts.

Claims (1)

[Scope of utility model registration request] An interlock device that is disposed between two electromagnetic contactors and prevents the other electromagnetic contactor from closing when one electromagnetic contactor performs an opening operation,
A box-shaped case split into two parts, a pair of push rods arranged in the case so as to be movable up and down with one side facing each other, and the upper and lower sides on the other side of each push rod. arms that protrude on the same line that crosses the lower movement axis, and whose tips penetrate through both side walls of the case facing each of the electromagnetic contactors and are engaged with the movable contact supports of the electromagnetic contactors on both sides, respectively; A heart-shaped piece is provided in the case so as to be swingable about an axis in the same direction as the direction in which the arms of each push rod are connected, and the lower end of each push rod is connected to the shoulders of both ends of the piece. The pieces are bent to abut on one of the parts, and the pieces are swung in opposite directions by both push rods, and when one of the push rods is pressing the piece, the other push rod A mechanical interlock device for an electromagnetic contactor, characterized in that it is locked by a piece.