Patent ID: 6204741
Filing Date: 2001-03-20
Classification: H01H

Abstract:
In a motor-operated mechanism with a gearwheel transmission and snap-action closing for a circuit-breaker having a twist knob for actuation, the improvement comprising:a driven gearwheel having a first pin, a second pin and an attachment;a driver reaching through said driven gearwheel for mounting said driven gearwheel centrally through the knob onto said driver, said driver gripping over and establishing a connection with the knob for manual actuation and transferring a driving force;a supporting lever mounted on said driver like said driven gearwheel and leading said driver and said supporting lever to a latching location, at a beginning of a switching-on operation;a prestressed spring received by said driven gearwheel and having a movable end supported on said first pin and simultaneously engaging in said supporting lever, said spring having a prestressing force passing from said first pin to said supporting lever;a resilient driver;a lug;an adjustment-free snap-action system;first and second limit switches; anda geared motor;said driven gearwheel continuing to rotate alone, stressing said spring further, until said second pin releases said latching location, and transfers a switching-on torque of said spring to said driver, said driver switching the circuit-breaker on with snap action, and subsequently said driven gearwheel with said resilient driver being driven resiliently against the knob, until said attachment moves said lug actuating said adjustment-free snap-action system and in turn actuating said first limit switch initiating reversing operation of said geared motor and of said driven gearwheel, for returning said driven gearwheel, said spring and said supporting lever to a starting position until said second limit switch ends said switching-on operation and carries out a switching-off movement in a manner analogous to said switching-on movement without snap action.