Electrical control circuit for electromechanical door operator

Claim 1

IN COMBINATION, AN ELECTROMECHANICAL DOOR OPERATOR COMPRISING A REVERSIBLE ELECTRIC MOTOR AND AN ELECTRIC CONTROL CIRCUIT FOR CONTROLLING THE AUTOMATIC OPERATION OF THE MOTOR DURING A DOOR OPENING AND CLOSING CYCLE, SAID CONTROL CIRCUIT COMPRISING A FIRST SWTICH OPERABLE TO CONNECT THE MOTOR TO THE POWER SOURCE TO ENERGIZE THE SAME TO MOVE THE DOOR IN THE DOOR OPENING DIRECTION, A SECOND SWITCH EFFECTIVE TO ENERGIZE THE MOTOR IN THE DOOR CLOSING DIRECTION, A THIRD SWITCH RESPONSIVE TO THE MOVEMENT OF THE DOOR TO A PRESELECTED POSITION DURING THE CLOSING MOVEMENT TO ENERGIZE A RELAY TO CHANGE THE CONNECTION BETWEEN THE MOTOR AND THE POWER SOURCE TO MODIFY THE TORQUE OF THE MOTOR AND TO ACTIVATE A FIRST ELECTRIC TIME DELAY CIRCUIT MEANS FOR CONTROLLING THE PERIOD OF TIME THE MOTOR TORQUE IS MODIFIED, AND ELECTRIC CIRCUIT MEANS RESPONSIVE TO THE OPERATION OF SAID FIRST SWITCH DURING THE CLOSING MOVEMENT OF THE DOOR TO ENERGIZE SAID RELAY FOR MODIFYING THE TORQUE OF THE MOTOR AND FOR ACTIVATING A SECOND TIME DELAY MEANS WHICH IS INDEPENDENT OF SAID FIRST TIME DELAY MEANS TO RENDER THE FIRST SWITCH INEFFECTIVE TO ENERGIZE THE MOTOR IN A DOOR OPENING DIRECTION FOR A PREDETERMINED PERIOD OF TIME.