JPS6033556Y2 - Release device for circuit breakers and disconnectors - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a release device that releases a circuit breaker using an external release button installed on a top plate covering a switchboard.

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2.

FIG. 1 is a side view, and FIG. 2 is a developed view thereof.

In the figure, 1 is a circuit breaker installed in the power distribution board;
2 is the internal release button, 3 is the internal release button 2 on one side
The other side has an L-shaped release pin 3' for operating it, and the other side has an L-shaped release pin 3' for ensuring engagement with a hinge hole 8', which will be described later.
The letter-shaped hook is a plate with metal 3'', the spring hook 4 is a plate, and a tension spring 5 is installed between the plate 3 and the plate.

Further, in the center thereof, there is a hole into which an external release button 11, which will be described later, slides.

6 is a top plate that covers the switchboard, 7 is a guide provided outside the top plate 6, and 8 is a support plate, which is connected to the guide 7 through the top plate 6 by screws 9 and spring washers 10, and is shown in FIG. Similarly, the spring hook is also screwed onto the plate 4 by screws 9 and spring washers 10 on its side.

Furthermore, there is a hinge hole 8' at its lower end, and the plate 3 rotates around this hole.

Reference numeral 11 denotes an external release button, and the spring hook is installed so as to slide through holes provided in each of the plate 4, the support plate 8, the top plate 6, and the guide 7, and the spring hook is attached to the plate 4 and the plate 3.
An E-shaped retaining ring 12, which is a stopper for the external release button 11, is fixed between the external release button 11 and the external release button 11.

Further, the external release button 11 is stepped so as to function as a stopper that immediately stops the movement of the circuit breaker 1 immediately after it is released.

11' is a contact point between the external release button 11 and the plate 3.

Next, its operation will be explained.

It is now assumed that the circuit breaker 1 is closed and power is supplied from its power supply side to the load side.

First, when the external release button 11 is pressed with force in the direction of the arrow F in the figure, the external release button 11 moves along the holes provided in each of the guide 7, top plate 6, support plate 8, and plate 4 as shown by the arrow. , and transmits force to the plate 3 against the force of the tension spring 5.

Then, the plate 3 starts rotating around the hinge hole 8', and the L-shaped protrusion provided at the tip pushes the internal release button device 2 of the circuit breaker 1 to release the circuit breaker 1. It is possible to cut off the power supply.

Immediately after this release, the external release button 11 is pressed to prevent unnecessary force from being applied to the internal release button 2 as described above.
The spring hook hits the plate 4 and stops its movement.

Next, when the force in the direction of arrow F in the figure is removed from the external release button 11, the plate 3 is released by the internal release button 2 by the force of the tension spring 5, and finally the E-shaped retaining ring 12 hits the plate 4 and Complete the movement.

The above is an overview of the operation of the conventional external release button device.In this device, the internal release button 2 and the external release button 11 are
．． The distance (dimension A) between the contact 11' of the plate 3, the hinge hole 8' and the external release button 11, and the contact 1 of the plate 3.
1' (dimension B), the pressure applied to the external release button 11 (F=pressure applied to the internal release button) required to release the circuit breaker 1 becomes extremely large.

Therefore, in an emergency, the circuit breaker 1 may not be released even if the external release button 11 is pressed.

Also, due to some other external force such as vibration, the release screw holder 13 is displaced around the rotation center of the external release button 11, and as a result, the adjustment screw 14 is disengaged from the internal release button 2 and pushes the external release button 11. There was a drawback that the circuit breaker 1 would not release no matter how much it was pressed.

This device was devised to eliminate the above-mentioned drawbacks, and by integrating the release button holder and the external release button, the circuit breaker can be released with a small amount of operating force. Furthermore, the spring hook is intended to provide an external release device that can be reliably released when necessary by providing a guide groove at the end of the plate to guide the movement of the release screw holder.

An embodiment of this invention will be described below with reference to the drawings.

That is, FIG. 3 is a side view thereof, and FIG. 4 is a developed view thereof.

In the figure, reference numeral 13 denotes the release screw holder of the present invention, the end of which is bent into a U-shape as shown in the figure, and a hole into which the external release button 11 is press-fitted is made in one part, and a hole is made in the other part. A hole is drilled through which a screw for attaching the external release button 11 passes.

Reference numeral 4' denotes a guide groove that guides the direction of movement of the release screw holder 13 so that it moves normally without interfering with its movement.

Note that the release screw holder 13 is constructed so that it will never come out of the guide groove 4' during its normal movement.

Further, reference numeral 14 is an adjustment screw, so that even if the distance between the top plate 6 and the mounting position of the circuit breaker 1 changes somewhat, it can be adjusted by adjusting this screw.

Further, 15 is a locking nut for firmly screwing the adjustment screw 14.

Other parts are the same as the conventional one, so explanations will be omitted.

Next, its operation will be explained.

That is, pressing the external release button 11 to release the circuit breaker 1 is exactly the same as the conventional one.

However, according to the above configuration, firstly, the external release button 11
is fixed to the release screw holder 13, so the operating force required for the external release button 11 to release the circuit breaker 1 is almost the same as the operating force for the internal release button 2. It requires a very small amount of force compared to .

The end of the release screw holder 13 is bent into a U-shape, and the external release button 11 is press-fitted into the hole made in one piece, and the external release button 11 and the release screw holder 13 are inserted into the hole in the other piece. There is a male thread that attaches firmly.

That is, since the external release button 11 is fixed to the external release button 11 at two points on the top of the release screw holder 13, when the release pin 3' pressurizes the internal release button 2, the direction of the pressing force is opposite to that of the release pin 3'. This reduces twisting (play) of the release screw holder 13 relative to the external release button 11.

Furthermore, by restricting the movement of the release screw holder 13 along the guide groove 4', the circuit breaker 1 can be released accurately when necessary.

As described above, this invention has the effect of reliably releasing the circuit breaker with a small amount of force when necessary.

Moreover, since the release screw holder that drives the circuit breaker is attached to the top plate, there is no need to provide a separate fixing part inside the top plate to hold the release screw holder, so the configuration is simple. become.

In the above-mentioned embodiment, the release screw holder and the external release button are fixed by tightening one screw, but it goes without saying that welding may also be used.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional release device, FIG. 2 is a developed view thereof, FIG. 3 is a side view showing an embodiment of this invention, and FIG. 4 is a developed view thereof. In the figure, 1 is a circuit breaker, 3' is a release pin, 4 is a spring plate, 4' is a guide groove, 5 is a spring, 6 is a top plate, 8 is a support plate, 11 is an external release button, and 13 is a It is a release screw holder. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In an external release device that releases a circuit breaker using an external release button installed on the top plate, the spring hook fixed to the top plate has a U-shape formed at one end, and the upper part of the U-shape is used to release the circuit breaker. The spring hook is supported in contact with the plate,
The spring hook is provided with a release screw holder on the other end to hang a spring between it and the plate, a hole is made in the U-shaped upper piece to allow the external release button to pass through and support, and the U-shaped lower piece is provided with a release screw holder. A release device for a circuit breaker, characterized in that the tip of the external release button is fixed to the plate, and the spring hook is provided with a guide groove in the plate for guiding the other end of the release button holder.