JPH07282671A - Operation mechanism for circuit breaker - Google Patents

Abstract

PURPOSE:To prevent the pushing of a closing button by mistake in the condition where a circuit breaker is closed by providing a stopper fixed on a connection lever interlocked with a switching lever between the closing button and a latch lever. CONSTITUTION:A cam 13 energized by a closing spring 17 to rotate is set rotatable by a latch lever 18 rotated by pushing a closing button 24, so a switching lever 10 is rotated to switch a circuit breaker 1 through a rod 7, a conversion lever 3, and a movable rod 2. In such an operation mechanism for the circuit breaker 1, a connection lever 25 is provided to be interlocked with the switching lever 10, and a stopper 26 is fixed to a forward end part of it. In the condition where the circuit breaker 1 is closed, the switching lever 10 is rotated upward by the cam 13 to move the connection lever 25 up, so the stopper 26 is interposed between the closing button 24 and the latch lever 18. In the condition where the circuit breaker 1 is disconnected, the connection lever 25 is moved down, and the stopper 26 is moved downward from between the closing button 24 and the latch lever 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker operating mechanism in which contacts are closed at high speed by energy accumulated in a spring.

[0002]

2. Description of the Related Art When a closing spring is extended by a motor and the closing energy is stored in the closing spring, and the circuit breaker is closed by this closing energy, the closing speed is always constant and the closing can be performed reliably.
FIG. 5 is a side view showing a breaking mechanism of a conventional circuit breaker,
It is a figure in which the circuit breaker is in a closing state. Moving contact 1A
A circuit breaker 1 including a fixed contact 1B and a fixed contact 1B is connected to the right end of the conversion lever 3 via a movable rod 2 via a pin 4. The conversion lever 3 is rotatably supported by a fixed pin 5, and a rod 7 is connected to a left end of the conversion lever 3 via a pin 6 together with a contact spring 8. The rod 7 is connected to an opening / closing lever 10 via a pin 9, and the opening / closing lever 10 is supported rotatably around a fixed pin 11. The open / close lever 10 rotatably supports the roller 12. A cam 13 is arranged in contact with the roller 12, and the cam 13
Is rotatably supported around a fixed pin 14 and is integrally formed with a lever 15 having a roller 16. Latch lever 18 that contacts the roller 16
Are rotatably supported via fixing pins 19.
Further, the closing button 2 that comes into contact with the latch lever 18
Reference numeral 0 penetrates the U-shaped button guide 22 and is movably supported in the left-right direction. Reference numeral 17 is a closing spring, which accumulates the closing energy that is extended by a motor (not shown) to rotate the cam 13.

In FIG. 5, the circuit breaker 1 is in the closed state because the cam 13 pushes up the roller 12. The latch lever 18 is always urged in the clockwise direction by a spring (not shown), but the operation piece 21 stops the movement of the latch lever 18 by the closing button 20. Therefore, the roller 13 of the cam 13 is stopped by the contact of the roller 16 with the latch lever 18. In this state, when the closing spring 17 is stretched by a motor (not shown), the closing waiting machine state is set.

[0004]

However, the conventional device as described above has a problem that the closing spring is released if the closing button is accidentally pressed in the closing waiting state. FIG. 6 is a side view showing a state in which the closing button is pressed in the apparatus of FIG. When the closing button 20 is pressed, the latch lever 18 rotates counterclockwise. As a result, the latch lever 18 is disengaged from the roller 16, so that the cam 13 is rotated counterclockwise by the closing spring 17. On the other hand, since the opening / closing lever 10 does not rotate unless an interruption mechanism (not shown) is operated,
The cam 13 idles, and the input energy stored in the input spring 17 is released. As a result, it is necessary to drive the motor again, and wasteful energy is consumed.

An object of the present invention is to prevent the closing button from being erroneously pressed in the closed state of the circuit breaker.

[0006]

In order to achieve the above object, according to the present invention, a closing spring in which the closing energy of the circuit breaker is accumulated by being stretched by driving a motor, and the closing energy of the closing spring. A cam that is rotated by the cam, an opening / closing lever that is pressed by the rotation of the cam to drive and close the circuit breaker, and the rotation of the cam is stopped at the closing position of the circuit breaker and the cam is freely rotated by pressing the closing button. A latch lever is provided with a connecting lever that interlocks with the opening / closing lever, and a stopper is fixed to the connecting lever.The stopper is interposed between the closing button and the latch lever when the circuit breaker is closed. It is preferable that the circuit breaker is arranged at a position away from between the closing button and the latch lever when the circuit breaker is in the disconnected state.

[0007]

According to the structure of the present invention, the stopper is fixed to the connecting lever which interlocks with the opening / closing lever. The stopper is interposed between the closing button and the latch lever, and is arranged at a position away from the closing button and the latch lever in the cutoff state of the circuit breaker. As a result, in the closed state of the circuit breaker, the closing button is obstructed by the stopper, so that the closing button does not move and the closing spring is not released.

[0008]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a side view showing an operating mechanism of a circuit breaker according to an embodiment of the present invention, in which the circuit breaker 1 is in a closed state. One end of the connecting lever 25 is fixed to the opening / closing lever 10, and the other end of the connecting lever 25 is configured to come into the U-shaped button guide 23.

FIG. 2 is an enlarged perspective view of a main part of FIG. The stopper 26 is screwed to the connecting lever 25, and a U-shaped groove 26A into which the closing button 24 is fitted is formed in the stopper 26. FIG. 3 is a view on arrow A in FIG. The button 24 is formed of a head portion 24A and shaft portions 24B and 24C. The shaft portions 24B and 24C have different diameters, and the tip side (right side) shaft portion 24C is thinner than the head portion 24A side shaft portion 24B. Groove 26 of stopper 26
The opening A is only slightly larger than the diameter of the shaft portion 24C, and the shaft portion 24B is not penetrated. That is, when the stopper 26 is present on the right side of the closing button 24, the shaft portion 24B hits the stopper 26 so that the pressing button 24 cannot be pressed.
The button guide 23 has a hole 23A (FIG. 2) that guides the closing button 24 in the left-right direction. The diameter of this hole 23A is slightly larger than the diameter of the shaft portion 24B. Other configurations of FIGS. 1 to 3 are the same as the conventional configuration described in FIG. The same portions will be denoted by the same reference symbols and repeated detailed description will be omitted. In FIG. 1, even if the closing spring 17 is stretched and the closing energy is accumulated in the closing spring 17, even if the closing button 24 is pressed by mistake,
As shown in FIG. 3, the stopper 26 is an obstacle and the latch lever 18 of FIG. 1 cannot be pushed. Therefore, when the circuit breaker 1 is in the closed state, the closing button 24 is never pressed, and there is no waste of accidentally releasing the closing spring.

FIG. 4 is a side view showing a state in which the device of FIG. 1 is shut off. The opening / closing lever 10 is rotated counterclockwise by a not-shown breaking mechanism to break the breaker 1. At that time, since the connecting lever 25 is pushed downward, the stopper 26 is also lowered and there is no obstacle to the pushing operation of the closing button 24. Therefore, it is possible to press the closing button 24 in the cutoff state.

[0011]

As described above, according to the present invention, the stopper is fixed to the connecting lever which interlocks with the opening / closing lever, and the stopper is interposed between the closing button and the latch lever. This prevents the closing spring from being released because the closing button does not move even if the closing button is pressed by mistake. Therefore, the waste of having to extend the closing spring again is eliminated.

[Brief description of drawings]

FIG. 1 is a side view showing an operating mechanism of a circuit breaker according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of an essential part of FIG.

FIG. 3 is a view on arrow A of FIG.

FIG. 4 is a side view showing a state in which the device of FIG. 1 is cut off.

FIG. 5 is a side view showing an operating mechanism of a conventional circuit breaker.

6 is a side view showing a state in which a closing button is pressed in the apparatus of FIG.

[Explanation of symbols]

1: breaker, 13: cam, 10: open / close lever, 17: closing spring, 18: latch lever, 24: closing button, 25: connecting lever, 26: stopper

Claims (1)

[Claims] 1. A closing spring that accumulates the closing energy of a circuit breaker when it is extended by driving a motor, a cam that rotates by the closing energy of the closing spring, and a circuit breaker that is pushed by the rotation of this cam. An open / close lever that is driven to close and a latch lever that stops the rotation of the cam at the closing position of the circuit breaker and that allows the cam to rotate freely by pressing the closing button. A stopper is fixed to this connecting lever, and this stopper is located between the closing button and the latch lever when the circuit breaker is closed, and is located away from the closing button and the latch lever when the circuit breaker is closed. An operating mechanism for a circuit breaker, which is characterized in that