Patent ID: 8395067

Claim:
A switchgear operating mechanism for reciprocatively driving a movable contact of a switchgear so as to shift the switchgear between a cutoff state and a closed state, the operating mechanism comprising: a frame; a closing shaft rotatably disposed relative to the frame; a main lever which is fixed to the closing shaft and which can be swung in conjunction with the movable contact; a cutoff spring which is disposed such that it accumulates energy when the switchgear operating state is shifted from the cutoff state to the closed state in accordance with rotation of the closing shaft while it discharges its accumulated energy when the switchgear operating state is shifted from the closed state to the cutoff state; a sub-shaft which is rotatably disposed relative to the frame so as to be positioned around a rotation axis substantially parallel to a rotation axis of the closing shaft; a sub-lever which is swingably fixed to the sub-shaft; a main-sub connection link which rotatably connects a leading end of the sub-lever and the main lever; a cam mechanism which swings the sub-shaft in accordance with a rotation of the closing shaft; a latch lever which is swingably disposed and fixed to the sub-shaft; a roller pin rotatably fixed to a leading end of the latch lever; a solenoid lever provided so as to be rotated relative to the frame around a rotation axis which is fixed to the frame and extends substantially parallel to the rotation axis of the closing shaft; a solenoid lever return spring which biases the solenoid lever so as to rotate the solenoid lever in a predetermined direction; a latch which is fixed to the solenoid lever at a position different from the rotation axis of the solenoid lever so as to be rotated around a rotation axis substantially parallel to the rotation axis of the closing shaft and has a leading end engageable with the roller pin; a latch return spring which biases the latch so as to rotate the latch in a predetermined direction; and an electromagnetic solenoid for cutoff which acts against the biasing force of the solenoid lever return spring to push the solenoid lever so as to shift the switchgear operating state from the closed state to the cutoff state, wherein in a state where the switchgear operating state is shifted from the closed state to the cutoff state, the solenoid lever is pushed by the electromagnetic solenoid for cutoff so as to be rotated in an opposite direction to the biasing direction of the solenoid lever return spring, and the latch lever is rotated by the biasing force of the roller pin to release an engagement between the roller pin and the leading end of the latch, which causes the cutoff spring to discharge its energy to rotate the latch lever.