Calculator protection system

Claim 1

A CONTROL SYSTEM FOR AN ELECTRIC CALCULATOR HAVING AN ELECTRIC MOTOR AND HAVING A CLACULATING CYCLE DRUING WHICH THE MOTOR IS ENERGIZED INCLUDING A NORMAL MAXIMUM DURATION CALCULATING CYCLE AND HAVING A STOP MECHANISM AND AN ACTUATOR THEREFOR ADAPTED TO ACTUATE SAID STOP MECHANISM WHEN ELECTRICALLY ENERGIZED, COMPRISING TIME DELAY RELAY MEANS ADAPTED WHEN ENERGIZED TO SHIFT FROM A FIRST POSITION TO A SECOND POSITION AFTER PASSAGE OF A CERTAIN TIME INTERVAL AND TO RETURN TO ITS FIRST POSITION AFTER PASSAGE OF A SECOND TIME INTERVAL, CIRCUIT MEANS FOR ENERGIZING A SAID TIME DELAY RELAY MEANS AND THE MOTOR CONTEMPORANEOUSLY WITH THE START OF A CALCULATOR CYCLE OF OPERATION, SECOND RELAY MEANS ADAPTED WHEN ENERGIZED TO SHIFT FROM A FIRST POSTION TO A SECOND POSITION, A PRIMARY CIRCUIT FOR ENERGIZING SAID SECOND RELAY MEANS WHEN SAID TIME DELAY RELAY MEANS IS ENERGIZED AND IN ITS FIRST POSITION, A SECODARY HOLDING CIRCUIT FOR SAID SECOND RELAY MEANS FOR HOLDING SAID SECOND RELAY MEANS IN ITS SECOND POSITION UNTIL THE END OF A CALCULATING CYCLE INDEPENDENTLY OF SAID PRIMARY CIRCUIT, THIRD RELAY MEANS ADAPTED TO SHIFT FROM A FIRST POSITION TO A SECOND POSITION WHEN ENERGIZED, CIRCUIT MEANS FOR ENERGIZING SAID THIRD RELAY MEANS WHEN SAID SECOND RELAY MEANS IS IN ITS SECOND POSITION AND SAID TIME DELAY RELAY MEANS IS IN ITS SECOND POSITION AND THEREAFTER TO CAUSE SAID THIRD RELAY MEANS TO REMAIN ENERGIZED UNTIL THE END OF A CALCULATING CYCLE, SAID THIRD RELAY MEANS IN ITS SECOND POSITION ACTING TO INTERRUPT SAID SECOND RELAY PRIMARY CIRCUIT, CIRCUIT MEANS FOR ENERGIZING SAID STOP MECHANISM ACTUATOR WHEN SAID TIME DELAY RELAY MEANS IS IN ITS FIRST POSITION AND SIMULTANEOUSLY SAID THIRD RELAY MEANS IS IN ITS SECOND POSITION, AND SAID CERTAIN TIME INTERVAL AND SAID SECOND TIME INTERVAL TOGEHER BEING LONGER THAN THT NORMAL MAXIMUM DURATION CALCULATING CYCLE FOR THE CALCULATOR.