Three-position locking device for withdrawable circuit breaker

Abstract

The invention relates to a three-position locking device for a withdrawable circuit breaker, comprising two support seats which are arranged on a base plate, a sliding plate which is arranged on the base plate and is positioned in front of the support seats, and a transmission screw rod which penetrates through the support seats and is connected with the sliding plate, wherein, a part of the transmission screw rod, which is adjacent to a base part, is provided with a plurality of circumferentially distributed clamp grooves, a square shaft is additionally arranged between the two support seats, the right lateral face of the square shaft is provided with three grooves, the opening of each groove is provided with a chamfered bevel edge, and an unlocking button is arranged on a rear support seat and drives a clamp plate to shift by the unlocking shaft; and the unlocking shaft is a square shaft, a square hole is arranged on the card plate, the unlocking shaft penetrates through the square hole and extends into the front support seat, a compression spring is arranged on the front end of the unlocking shaft on the front support seat so as to enable the unlocking shaft to shift backwards,the right side edge of the unlocking shaft is provided with a dummy club of which the front lateral face is an inclined plane, a square notch is arranged on the dummy club, the height of the notch isnot larger than the height of the chamfered bevel edge of each groove, and the width of the square hole of the card plate is no less than the width of the dummy club of the unlocking shaft. The invention has the advantages of simple structure and reliable running.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a three-position locking device for a drawer type circuit breaker. Background technique [0002] In the withdrawable circuit breaker, there are usually three states of separation, test and connection. In order to make the circuit breaker in the above three positions, it can be accurately positioned to avoid misoperation, and a drawer circuit breaker with a locking device appears. When the circuit breaker is in any position of separation, test and connection, the locking device can be used to lock it, and the circuit breaker can only be moved after unlocking, as in the patent documents of Chinese Patent No. 02264483.0 and 200620125962.0 A locking device with such a function is disclosed, and since both of these two patent documents use a locking piece with a square shaft to achieve the locking function, it is obvious that the structure of this method is very complicated. Contents of the inve...

AI Technical Summary

Problems solved by technology

[0002] In the withdrawable circuit breaker, there are usually three states of separation, test and connection. In order to make the circuit breaker in the above three positions, it can be accurately positioned to avoid misoperation, and a drawer circuit breaker with a locking device appears. When the circuit breaker is in any position of separation, test and connection, the locking device can be used to lock it, and the circuit breaker can only be moved after unlocking, as in the patent documents of Chinese Patent No. 02264483.0 and 200620125962.0 A locking device with such a function is disclosed, and since the two patent documents use the locking piece with the square shaft to achieve the locking function, it is obvious that the structure of this method is very complicated

Images