JPS6260784B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a locking device for an electromagnetic contactor, and more particularly to a mutual locking device disposed between a pair of reversibly used electromagnetic contactors.

[Prior Art] Generally, this type of locking device is used to prevent the forward and reverse rotation circuits of a motor for forward and reverse rotation from being turned on at the same time. It is provided between two electromagnetic contactors arranged in parallel at opposite positions, and is configured such that when one electromagnetic contactor is in the closed state, the other magnetic contactor is mechanically prohibited from closing.

FIG. 1 shows an example of the configuration of such a conventional locking device for an electromagnetic contactor. Here, 1A and 1B
are a pair of electromagnetic contactors attached to base 2, 3
is a locking device provided between these.
As shown in FIG. 2A, this locking device 3 incorporates a pendulum 6 that is rotatable around a pin 5 that is pivotally supported by a case 4.
A letter-shaped engaging portion 7 is formed.

Therefore, both ends of this engaging portion 7 are connected to the electromagnetic contactor 1.
The L-shaped engaging parts 8A and 8B of the movable contacts A and 1B are engaged with each other, and when both the electromagnetic contactors 1A and 1B are in a non-excited state, the state shown in FIG. 2A is maintained. When one of the electromagnetic contactors 1B becomes energized, as shown in FIG. 2B, the action of its movable contact causes the engaging portion 8B to push down the end of the T-shaped engaging portion 7 located at the opposite position. ,
By tilting the pendulum 6 to the opposite side, the other end of the T-shaped engaging portion 7 is kept in contact with the engaging portion 8A.

However, the locking device configured in this manner has the following drawbacks. That is,
In FIG. 2A, the engaging portions 8A, 8 of the movable contact
Assuming that the amount of engagement between B and the engaging portion 7 of the pendulum 6 is A, if the amount of engagement A is too large, both electromagnetic contactors 1A and 1B cannot be turned on.

Furthermore, if the engagement amount A is too small, engagement will not occur, and both electromagnetic contactors 1A
and 1B may be turned on together, causing a short circuit between phases of the main circuit. Furthermore, if the gap size B is large, there will be too much play, and there is also a high risk of a short circuit between phases when simultaneous closing commands occur.

Furthermore, if the gap dimension B is too small,
In the operating state shown in FIG. 1, the upward dimension C of the pendulum engaging portion 7 becomes larger than the gap dimension B, so that the pendulum 6 is moved to the engaging portion 8B by the movable contact engaging portion 8A. Even if the electromagnetic contactor 1B were to be biased to the side and the electromagnetic contactor 1B was in a non-excited state, there was a risk that the circuit would not be able to be disconnected due to the frictional contact between the engaging portions 8B and 7.

In other words, in the conventional pendulum type locking device of this kind, strict accuracy is required for the engagement dimension A, the gap dimension B, etc., and therefore there is a problem that it takes too much time and effort to manufacture and assemble the parts. It was hot.

[Objective] In view of the above-mentioned problems, an object of the present invention is to provide a locking device for an electromagnetic contactor that reliably prevents simultaneous input, is easy to assemble, and can reduce construction costs.

[Summary of the Invention] In order to achieve such an object, the present invention has the following features:
A pair of electromagnetic contactors arranged side by side in opposite positions are connected to each movable contact holding member and respond to the movement of the movable contact holding members respectively, and are arranged in opposite positions and slidably on each other's contact surfaces. A responsive member that maintains contact and forms a recess when both sides of the electromagnetic contactor are demagnetized by a tapered surface formed at the end of the contact surface in the sliding direction, and a recess formed by the responsive member. A movable locking pin in the shape of a round bar having an outer circumferential surface that maintains contact with the tapered surface, a spring that biases the locking pin toward the recess, and a chain that has a shape corresponding to the recess and is biased toward the recess. It has a lock pin and a protrusion that maintains a predetermined gap, and when any of the electromagnetic contactors becomes energized, the corresponding response member protrudes in response to the movable contact holding member of the electromagnetic contactor that has become energized. By biasing the locking pin toward the tapered surface of the other response member, movement of the other response member in the direction of the protrusion through the locking pin is prohibited, thereby preventing the other response member from moving in the direction of the protrusion. The present invention is characterized in that the closing operation of the electromagnetic contactor associated with the responsive member is prohibited.

[Example] The present invention will be described in detail below based on the drawings.

Figures 3A and 3B illustrate one embodiment of the invention.
Here, 1A is a reverse rotation side electromagnetic contactor, 11A is its movable contact holding member, 1B is a normal rotation side electromagnetic contactor, and 11B is its movable contact holding member. The locking device 30 is fixed by screws 13 via a mounting base 12 between the walls of these electromagnetic contactors 1A and 1B.

Reference numerals 14A and 14B are reaction members that are slidable in the vertical direction in FIG. 3B, and these reaction members 14A and 14B have a symmetrical shape as shown in FIG. keep,
Further, the movable contact holding members 11A and 11B are connected by connecting pins 15A and 15B. 16A and 16B are pin holes.

Further, the lower surfaces of the response members 14A and 14B are formed into tapered surfaces 17A and 17B, and when both electromagnetic contactors 1A and 1B are in a demagnetized state, an inverted V-shaped recess 18 is formed by the tapered surfaces 17A and 17B. be done. 19 is a movable locking pin, 20 is a return spring whose one end is hooked into a locking hole 21 provided on the top surface of the locking device cover 30A, and the other end of this return spring 20 is locked. By engaging the pin 19, the locking pin 19 is biased into the inverted V-shaped recess 18.

Note that these springs 20 are inserted into vertical notches 22 formed on both sides of the response members 14A and 14B, respectively, as shown in FIGS. 4 and 5A.
so that it leads between A and 22B.

25 is an arcuate top 25 right below the locking pin 19.
A, and the shape of the upper surface with the apex 25A as the apex corresponds to the shape of the recess 18 as shown in FIGS. 3B and 5B. 25 is attached to the mounting base 12.

The locking operation of the locking device for the electromagnetic contactor constructed in this way will be explained with reference to FIGS. 5B and 5C. Now, as shown in FIG. 5B, if both electromagnetic contactors 1A and 1B are in a demagnetized state and a closing command is given to the forward rotation side electromagnetic contactor 1B, the movable contact holding member When the movable contact 11B (not shown) moves toward the fixed contact, the response member 14B responds downward as shown in FIG. 5C.

Therefore, due to the operation of this response member 14B,
The locking pin 19 is biased to the left from the position of the recess 18 due to the tapered surface 17B of the member 14B, and at the end of the closing, the locking pin 19 is in the position shown in FIG. 5C. Stay.

Therefore, even if the electromagnetic contactor 1A on the reverse side is energized in this state, the response member 1
4A is prevented from lowering by the locking pin 19 and is not thrown in.

Next, if the normal rotation side electromagnetic contactor 1B is demagnetized from the state shown in FIG. 5C, the response member 14B is pulled back upward together with the movable contact holding member 11B, resulting in the state shown in FIG. 5B. At the same time, the locking pin 19 is also returned to the position of the recess 18 by the spring force of the return spring 20.

This operation is the same even when the magnetic contactor 1A is turned on first, and its explanation will be omitted, but if we consider a case where simultaneous excitation is performed in both magnetic contactors 1A and 1B, In this example, as shown in FIG. 5B, a gap G is provided between the locking pin 19 and the top portion 25A of the distribution member 25, so that the holding member 11 is removed by this gap G.
A and 11B are lowered simultaneously, but are mechanically locked from then on. Moreover, the pin 19 and the member 25
At this point, rolling contact is maintained, so unlike the conventional sliding contact, there is no possibility of failure to return due to frictional force.

Furthermore, when setting the gap G, it is possible to keep it sufficiently small.

Note that such a locking device 30 can be applied by appropriately aligning the position of the top portion 25A of the distribution member 25 with respect to the recess 18 even when the magnet strokes of both the electromagnetic contactors 1A and 1B are different. In addition, if both magnetic contactors 1A _and 1B are both large or small, the dimensions L ₁ and G shown in FIG. The height of the distributing member 25 may be changed according to the contactor size.

[Effects] As described above, according to the present invention, the response members connected to each of the movable contact holding members are arranged opposite to each other in slidable contact with each other, and the response members have a sliding direction. A tapered surface is provided that is inclined toward the magnetic contactor, and when the electromagnetic contactor is in a demagnetized state, both tapered surfaces located at symmetrical positions form a recess at the contact end position of the responsive member in the sliding direction. A locking pin in the shape of a round rod is movably provided in the locking pin so that its peripheral surface maintains contact with both tapered surfaces, and this pin is always biased toward the recess by the spring force of the return spring. A predetermined gap is maintained between the pins on the side facing the recess, and a protruding member having a shape corresponding to the recess and distributing the pins is fixed, and when any of the electromagnetic contactors is inserted, , the pin is interposed between the other response member and the projection member, and the closing operation of the other electromagnetic contactor is prohibited via the response member, so that the conventional pendulum type engagement member is Unlike the seesaw type with a locking mechanism, the locking mechanism can be easily locked using a low-friction pin without causing smooth locking or malfunctions due to the finished dimensional accuracy or assembly accuracy of the parts. A lock can be obtained, a stable and reliable locking effect can always be obtained, and there is no need for assembly or adjustment.

Furthermore, even when using an electromagnetic contactor in which the opening/closing stroke of the movable contactor holding member is different or the size is different, it is only necessary to adjust the position of the distribution protrusion member, thereby expanding the scope of application of the present invention. be able to.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an outline of a locking device for a conventional electromagnetic contactor as an example, and Figs. 2 A and B show the state when the pendulum-type engaging member is demagnetized and when one electromagnetic contactor is energized. 3A and 3B are a plan view and a side view, respectively, showing an example of the structure of a locking device for an electromagnetic contactor according to the present invention, and FIG. 4 is an exploded perspective view showing the main components thereof. Figure 5A is a sectional view taken along line B-B of Figure 3B,
FIGS. 5B and 5C are cross-sectional views taken along line A-A in FIG. 3A, showing the posture of the response member when both magnetic contactors in the present invention are in a demagnetized state and one magnetic contactor is in an energized state. It is. 1A, 1B...Magnetic contactor, 2...Base, 3
...Locking device, 4...Case, 5...Pin, 6...
... Pendulum, 7... Engaging part, 8A, 8B... Engaging part,
10A, 10B...Protrusion, 11A, 11B...Movable contact holding member, 12...Mounting base, 13...
...Screw, 14A, 14B...Response member, 15A,
15B... Connecting pin, 16A, 16B... Pin hole, 17A, 17B... Tapered surface, 18... Recess, 19... Locking pin, 20... Spring, 21...
Latch hole, 22A, 22B...notch, 25...
Distribution member as a protrusion, 25A...top, 3
0...Lock device, 30A...Cover.

Claims (1)

[Claims] 1. Connected to the movable contact holding members of each of a pair of electromagnetic contactors juxtaposed at opposing positions so as to respond to the movement of the movable contact holding members respectively, and arranged at opposing positions to slide on each other's contact surfaces. a responsive member that freely maintains contact and forms a recess when both of the electromagnetic contactors are demagnetized by a tapered surface formed at the end of the contact surface in the sliding direction; a movable locking pin in the shape of a round bar having an outer circumferential surface that maintains contact with the tapered surface in the recess formed therein, a spring that biases the locking pin toward the recess, and a shape corresponding to the recess. and a protrusion that maintains a predetermined gap with the locking pin biased in the recess, and when any of the electromagnetic contactors is in an energized state, the electromagnetic contactor that is in the energized state is In response to the movable contact holding member, a corresponding responsive member moves in the direction of the protrusion and biases the locking pin toward the tapered surface of the other responsive member, thereby causing the locking pin to move toward the protrusion. An electromagnetic contactor chain, characterized in that the other response member is prohibited from moving in the direction of the protrusion, thereby prohibiting the closing operation of the electromagnetic contactor associated with the other response member. Locking device.