OPERATING MECHANISM OF A THREE-POSITION SWITCH

摘要

An operating mechanism of a three-position switch having a contact-bearing main shaft comprises a switch closing and opening operation device, and an earthing device closing and opening operating device. The two devices comprise driving flange plates connected by a common spring capable of being loaded by rotation of either of the operating shafts and transmitting, after the deadpoint has been reached, a drive movement of these flange plates transmitted by articulated levers to a crank handle wedged onto the main shaft. All the operations are high-speed and the torque transmitted to the main shaft increases in the course of the operating movement. A locking device maintains the main shaft in the open position during the loading phase of the spring.