Control circuit

Claim 1

A CONTROL SYSTEM FOR A MAGNETICALLY OPERATED APPARATUS AND COMPRISING A CIRCUIT CONNECTABLE TO A SOURCE OF VOLTAGE AND INCLUDING, IN SERIES, AN OPERATING COIL OF THE DEVICE TO BE CONTROLLED, A RESISTANCE, AND A SET OF NORMALLY CLOSED CONTACTS, A CORE FOR SAID COIL, AN ARMATURE MOVABLE TOWARD AND AWAY FROM THE CORE, WHEREBY, UPON MOVEMENT OF THE ARMATURE INTO PREDETERMINED PROXIMITY TO THE CORE, THE MAGNITUDE OF THE CURRENT FLOWING IN SAID CIRCUIT DIMINISHES, A RECTIFIER, A CONDENSER, CIRCUIT MEANS CONNECTING THE RECTIFIER AND CONDENSER IN SERIES WITH EACH OTHER AND IN SHUNTING RELATION TO THE RESISTANCE, THEREBY TO CAUSE SAID CONDENSER TO BE CHARGED BY THE CURRENT PRIOR TO SAID DIMINUTION IN SAID MAGNITUDE AND TO DISCHARGE UPON SAID DIMINUTION IN SAID MAGNITUDE, AND MEANS RESPONSIVE TO THE DISCHARGE OF THE CONDENSER TO OPEN SAID SET OF NORMALLY CLOSED CONTACTS, AND A CURRENT LIMITING RESISTOR SHUNTING SAID CONTACTS FOR LIMITING THE MAGNITUDE OF CURRENT FLOWING IN SAID COIL AFTER THE OPENING OF SAID SET OF CONTACTS.