Withdraw-in and withdraw-out apparatus for air circuit breaker

A withdraw in and withdraw out apparatus for an air circuit breaker for withdrawing in and withdrawing out a breaker body from a cradle thereof comprising:

• a withdraw-in and withdraw-out shaft formed with a handle connector connecting a manipulating handle for obtaining a rotation driving force and providing the rotation driving force transmitted from the handle connector as a driving force for withdrawing in and withdrawing out the body thereof;
• a spiral shaft rotatable by the rotation driving force from the withdraw-in and withdraw-out shaft and formed with a spiral part for converting the rotation driving force to a linear moving force;
• a moving rack formed with a spiral support spirally connected to the spiral part of the spiral shaft and for linearly moving along with the spiral part of the spiral shaft to linearly move the body loaded thereon to withdraw-out and withdraw-in directions;
• a coupling interposed between the withdraw-in and withdraw-out shaft and the spiral shaft and capable of being moved to a position where the rotation driving force from the withdraw-in and withdraw-out shaft is connected to the spiral shaft and to a position where the connection is discontinued to idle the withdraw-in and withdraw-out shaft;
• a spring for resiliently supporting the coupling in such a manner that the spring resiliently supports at an elastic energy-accumulated position the coupling for transmitting the rotation driving force from the withdraw-in and withdraw-out shaft to the spiral shaft, and the spring resiliently supports at an elastic energy-released position the coupling for discontinuing the rotation driving force to the spiral shaft;
• a reset operator including a reset push tip end receiving a push from a user when pressed by the user in such a manner that the spring is pressed to a position where the elastic energy is accumulated to allow the coupling to stay on a position where the rotation driving force from the withdraw-in and withdraw-out shaft is transmitted to the spiral shaft, and a spring support connecting an end of the spring;
• an indicating rod formed with a latch restraining the reset operator or releasing the restraint of the reset operator whenever the body is located at a connected position, a test position and a disconnected position, and a twist part connected to the moving rack to thereby indicate a position of the body by rotating in response to the movement of the moving rack;
• and a lock plate temporarily stopping the withdraw-in and withdraw-out operation of the body by temporarily breaking the coupling whenever the indicating rod releases the reset operator from the connected, test and disconnected positions.