JPH0512906Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is installed between two electromagnetic switches,
This invention relates to a mechanical interlock device that prevents the opening operation of one electromagnetic switch while the other electromagnetic switch is open.

[Conventional technology]

FIG. 5 is a partial sectional view schematically showing the driving means for the interlock device of the electromagnetic switch with the electromagnetic switches attached on both sides of the interlock device, where 1 is the interlock device and 2 is the first electromagnetic switch. switch; 3 is a second electromagnetic switch; 4a, 4b are crossbars connected to respective movable iron cores; 5;
Lever pins a and 5b respectively engage with the cross bars 4a and 4b, and are housed inside.

FIG. 6 is a sectional view taken along line A-A in FIG.
The configuration of the interlock device 1 is shown. 5a, 5b
is the lever pin shown in FIG. 8a, 8b
are the tips of the interlock levers 6a, 6b, 9
Reference characters a and 9b are rotating shafts of the interlock levers 6a and 6b, and reference numbers 10a and 10b are return springs.

In the interlock device configured as described above, when, for example, the first electromagnetic switch 2 is turned on from the state shown in FIG. 5, the crossbar 4a connected to the movable iron core moves downward, By the lever pin 5a, the interlock lever 6a rotates about the rotation axis 9a from the dotted line position to the position shown in the actual battle as shown in FIG. It enters inside the tip 8b and stops at a predetermined position.

Here, for example, even if the second electromagnetic switch 3 is excited by an external input, the movable iron core is attracted, and a rotational force is actuated on the interlock lever 6b by the lever pin 5b, the inside of the tip 8b The state shown in FIG. 7 is maintained by being blocked by the tip 8a of a certain interlock lever 6a. Also, for example, contrary to the above, the second electromagnetic switch 3 is turned on first, the interlock lever 6b is rotated by the lever pin 5b, and then the first electromagnetic switch 2 is excited, and the lever pin 5a is turned on. Even if the interlock lever 6a attempts to rotate due to operation, it is blocked by the tip 8a and cannot rotate.

[Problem that the invention attempts to solve]

In the conventional electromagnetic switch interlock device as described above, for example, when the first electromagnetic switch 2 which is in the closing state shown in FIG. 7 is instantaneously switched to the closing state of the second electromagnetic switch 3, The interlock lever 6a rotates due to the spring force of the return spring 10a and the upward displacement of the lever pin 5a, and the lever pin 5
If the respective tips 8a and 8a interfere with the interlock lever 6b, which rotates due to the downward displacement of the interlock lever 6b, as shown in FIG. The outer edge of the tip 8a of the lever 6a is pressed downward with a predetermined pressing force, and the direction of the pressing force is opposite to the direction of rotation of the interlock lever 6a when it returns to closing and releasing, and the interlock lever 6b is pressed. Since the pressure acts as a frictional force against the restoring force of the interlock lever 6b, the interlock levers 6a and 6b are balanced at the position shown in FIG. 8 and their rotation is temporarily stopped, causing the motor to When switching between forward and reverse rotation, there was a problem in which the switching could not be performed as specified.

This invention was devised in order to solve this problem, and to provide an interlock device that can perform instantaneous switching between two electromagnetic switches without stopping the operation midway. With the goal.

[Means for solving problems]

In the interlock device for an electromagnetic switch according to this invention, each interlock lever has an arc-shaped outer edge centered on the rotation axis at its tip, and an arc-shaped outer edge centered on the rotation axis of the other interlock lever. The interlock lever has an arcuate side edge, and the closing force of one interlock lever acts on the boundary between the outer edge and the side edge in the direction of returning the other interlock lever to the falling state when the boundary portions collide with each other. The structure is such that a notch is provided.

[Effect]

In this invention, when one electromagnetic switch is released from closing and the other electromagnetic switch is closed at the same time, the interlock lever on the closing release side is rotated to the return position and the interlock lever on the closing side is locked. Even if the tips of both interlock levers may intersect depending on the timing of rotation to the lock position, the arc-shaped outer edge of the tip of each interlock lever around the rotation axis and the rotation of the other. Since a notch is provided at the boundary with the arc-shaped side edge centered on the shaft, the closing force of the interlock lever on the closing side is directed perpendicular to the surface of the notch of the interlock lever on the closing and releasing side. Since the interlock lever on the closing/release side returns to its fallen state, the interlock lever on the closing/release side returns to its original position, and the rotation of both interlock levers is not stopped.

[Example of idea]

FIG. 1 is a front view showing the shape of a pair of interlock levers provided in an interlock device for an electromagnetic switch according to an embodiment of this invention, and shows the structure and configuration of the interlock device excluding these interlock levers. The shape etc. of each component part is shown in the 6th section.
This is the same as the conventional example shown in the figure. In the figure, 6
a and 6b are interlock levers, 8a and 8b are tip portions where these interlock levers 6a and 6b come close to each other when rotating around rotational axes 9a and 9b, and 11a and 11b are provided at tip portions 8a and 8b. The notch 12 is a lever pin that operates each of the interlock levers 6a and 6b each time the electromagnetic switch is closed or released. 13
a, 13b are arcuate outer edges centered on the rotation axes 9a, 9b of the interlock levers 6a, 6b, respectively; 14a, 14b are the interlock levers 6;
These are arcuate side edges centered on the rotational axes 9b and 9a of rotation axes a and 6b, respectively.

Interlock levers 6a, 6b as described above
When the electromagnetic switch 3 attached to the interlock device as shown in FIG. 5 is released from the closed state shown in FIG. 2 and the electromagnetic switch 2 is closed at the same time, As shown in FIG. 4, the interlock lever 6b, which is connected to the operation of the electromagnetic switch 3, returns to the return position and rotates in the direction of the arrow, and at the same time, the interlock lever 6a, which is connected to the operation of the electromagnetic switch 2, rotates in the direction of the arrow.
turns towards the locked position and rotates in the direction of the arrow, but
Generally, the time it takes to go from the closing state to the closing state after releasing the closing state is about twice as long as the time from the dropping state to the closing state after giving the closing command, so first, the interlock lever 6b works quickly, as shown in Fig. 3. It will go through a state.

In this case, when the tips 8a and 8b, which are moving to the return position and the locking position, intersect as shown in the figure, as shown in FIG.
Although the notches 11a and 11b interfere with each other,
As shown in the figure, notches 11 are provided at the tips 8a and 8b of the interlock levers 6a and 6b.
a, 11b are cut by a notch angle α with respect to the tangent to the outer edges 13a, 13b, so that the closing force of the interlock lever 6a is applied to the surface of the notch 11b of the mating interlock lever 6b. Since the interlock lever 6b acts in the vertical direction and is applied in the direction of returning it to the falling state, the interlock lever 6b returns as it is, so both interlock levers 6
A and 6b rotate to the predetermined return position and lock position, respectively, without being prevented from rotating due to interference.

[Effect of idea]

As explained above, when one electromagnetic switch is released from closing and the other electromagnetic switch is closed at the same time, the lock lever on the closing release side is rotated to the return position, and the interlock lever on the closing side is rotated. Even if the tips of both interlock levers may intersect depending on the timing of the rotation of the lock levers to the locking position, the outer edge of each interlock lever has an arc-shaped outer edge centered on the rotation axis. By providing a notch at the boundary between the side edge of the interlock lever on the closing side and the circular arc-shaped side edge centered on the other rotating shaft, the closing force of the interlock lever on the closing side is applied to the surface of the notch on the interlock lever on the closing and releasing side. acts perpendicularly to
Since the interlock lever on the closing and releasing side is applied in the direction of returning it to its fallen state, the interlocking lever on the closing and releasing side returns as it is, and the rotation of both interlock levers is not restricted, allowing smooth switching of the electromagnetic switch. This has the advantage of providing an interlock device that can be operated in multiple ways.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the shape of an interlock lever provided in an interlock device for an electromagnetic switch according to an embodiment of this invention, and FIGS. 2 to 4 show the interlock lever shown in FIG. 1. FIG. 5 is a partial sectional view showing a combination of a conventional electromagnetic switch and an interlock device, FIG. 6 is a sectional view showing the configuration of a conventional interlock device, and FIGS. FIG. 8 is an explanatory diagram of the operation of the interlock device of FIG. 6. In the figure, 6a, 6b, 8a, 8b are tips, 9a, 9b are rotating shafts, 11a, 11b are notches, 13a, 13b are outer edges, and 14a, 14b are side edges. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] A pair of interlock levers each having a lever pin that engages with a rotating shaft and a crossbar of an electromagnetic switch, and which are arranged symmetrically and are given a return rotational force by a return spring. In an electromagnetic switch interlock device that prevents the closing operation of the other electromagnetic switch while one electromagnetic switch is closed, each interlock lever has a circle centered on the rotation axis at its tip. It has an arcuate outer edge and an arcuate side edge that is continuous with the arcuate edge and is centered on the rotation axis of the other, and one interface is formed at the boundary between the outer edge and the side edge when the boundary portions collide with each other. 1. An interlock device for an electromagnetic switch, characterized in that a notch portion is provided through which the closing force of one lock lever acts in a direction to return the other interlock lever to a fallen state.