| 摘要 |
A mechanism for operating a three-position switch having a main contact-carrier shaft (10) includes a control device (14) for closing and opening the switch, and a control device (15) for earthing. The two devices include drive-plates connected by a common spring (27) capable of being armed by the rotation of any one of the control shafts and of transmitting, after crossing the dead point, a motive motion for driving these plates, transmitted by levers hinged to a crank (32) fastened onto the main shaft (10). All the operations are abrupt and the torque transmitted to the main shaft increases during the operating motion. A locking device keeps the main shaft in the open position during the spring-arming phase. …<IMAGE>… |
