Patent ID: 8420969

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 disposed and 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 attached to a leading end of the latch lever; a latch which is disposed so as to be rotated relative to the frame around a rotation axis substantially parallel to the rotation axis of the closing shaft; a latch return spring which biases the latch so as to rotate the latch in a predetermined direction; a latch pin which is fixed to the latch; and a ring which has an inner diameter larger than an outer diameter of the latch pin and is disposed surrounding an outer periphery of the latch pin in a radial direction so as to be movable in a radial direction of the latch pin, wherein in the closed state, the roller pin pushes a leading end of the latch in a direction toward center of rotation axis of the latch, and in a state where the switchgear operating state is shifted from the closed state to the cutoff state, the latch is pulled so as to allow the latch to be rotated in a direction opposite to the biasing direction of the latch return spring 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.