Patent ID: 9679722
Date: 2017-06-13
CPC Classifications: H01H,H02B

Claim:
1. An interlock apparatus of a vacuum circuit breaker for adjusting withdrawal of a circuit breaker main body, which is installed in a truck configured to move to a connected position in which the circuit breaker main body is connected to a cradle and further configured to move to a disconnected position in which the circuit breaker main body is separated from the cradle within the cradle, to outside of the cradle, the interlock apparatus comprising: a lift comprising a rotation adjusting plate provided at an upper portion thereof, and configured to move forward and backward such that the rotation adjusting plate is inserted into the interior of the cradle or separated from the cradle; and an interlock plate provided within the cradle and configured to rotate according to movement of the rotation adjusting plate so as to be tightly attached to the truck or released from the tightly attached state and adjust withdrawal of the circuit breaker main body to the outside of the cradle, wherein: an upper end of the interlock plate comprises an upwardly sloped surface from one side of the interlock plate toward a central portion; a stoppage protrusion is disposed to be spaced apart from the sloped surface by a predetermined distance in an inward direction of the cradle; a stoppage plate is disposed on a lower surface of the truck and protrudes downwardly; the stoppage protrusion is positioned in front of the stoppage plate when the rotation adjusting plate is not inserted into the cradle such that the stoppage plate is caught by the stoppage protrusion when the circuit breaker main body moves and prevents withdrawal of the circuit breaker main body by the interlock plate, and the rotation adjusting plate is configured to push the sloped surface to rotate the interlock plate when the rotation adjusting plate is inserted into the cradle such that the stoppage protrusion is positioned below the stoppage plate, whereby the circuit breaker main body is drawn out from the cradle.