Patent ID: 8912870
Filing Date: 2014-12-16
Classification: H01H

Abstract:
1. 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 fixed to the closing shaft and capable of being swung in conjunction with the movable contact; a cutoff spring 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 disposed so as to be rotatable relative to the frame around a rotation axis substantially parallel to a rotation axis of the closing shaft; a sub-lever swingably fixed to the sub-shaft; a main-sub connection link rotatably connecting a leading end of the sub-lever and the main lever; a cam mechanism swinging the sub-shaft in accordance with the rotation of the closing shaft; a latch lever swingably fixed to the sub-shaft; a latch roller pin rotatably mounted to a leading end of the latch lever; a trigger lever disposed so as to be rotatable relative to the frame around a rotation axis substantially parallel to the rotation axis of the closing shaft; a trigger roller pin rotatably mounted to a leading end of the trigger lever; a trigger lever return spring biasing the trigger lever so as to rotate the trigger lever in a predetermined direction; a latch fixed to the trigger lever at a position different from a rotation axis of the trigger lever so as to be rotatable around a rotation axis substantially parallel to the rotation axis of the closing shaft and having a leading end engageable with the latch roller pin; a latch return spring biasing the latch so as to rotate the latch in a predetermined direction; a solenoid lever disposed relative to the frame so as to be rotatable around a rotation axis substantially parallel to the rotation axis of the closing shaft and having a leading end engageable with the trigger roller pin; a solenoid lever return spring biasing the solenoid lever so as to rotate the solenoid lever in a predetermined direction; and an electromagnetic solenoid for cutoff which acts against a 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 to release an engagement between the trigger roller pin and the solenoid lever, and the trigger lever and an eccentric pin are rotated by the biasing force of the latch roller pin to release an engagement between the latch roller pin and the leading end of the latch, which causes the cutoff spring to discharge its energy to rotate the latch lever.