Control system for electric cranking motors

Claim 1

A CONTROL CIRCUIT FOR AN ELECTRIC STARTING MOTOR COMPRISING, AN ENGINE, AN ELECTRIC STARTING MOTOR FOR CRANKING SAID ENGINE, A SOURCE OF DIRECT CURRENT, A MAGNETIC SWITCH INCLUDING A COIL WINDING AND SWITCH CONTACTS, A MANUALLY OPERABLE SWITCH, MEANS ELECTRICALLY CONNECTING THE SWITCH CONTACTS OF SAID MAGNETIC SWITCH IN SERIES BETWEEN SAID SOURCE OF DIRECT CURRENT AND SAID ELECTRIC STARTING MOTOR, A CURRENT RELAY HAVING A COIL WINDING AND SWITCH CONTACTS, MEANS CONNECTING THE COIL WINDING OF SAID CURRENT RELAY WITH SAID ELECTRIC STARTING MOTOR AND SAID SOURCE OF DIRECT CURRENT WHEREBY SAID RELAY RESPONDS TO THE MAGNITUDE OF CURRENT FLOWING BETWEEN SAID SOURCE OF DIRECT CURRENT AND SAID STARTING MOTOR, A LOCK OUT RELAY INCLUDING A COIL WINDING AND SWITCH CONTACTS, MEANS CONNECTING SAID MANUALLY OPERABLE SWITCH, THE CONTACTS OF SAID LOCK OUT RELAY AND THE COIL WINDING OF SAID MAGNETIC SWITCH ACROSS SAID SOURCE OF DIRECT CURRENT, MEANS CONNECTING THE CONTACTS OF SAID CURRENT RELAY WITH THE COIL WINDING OF SAID MAGNETIC SWITCH AND WITH THE COIL WINDING OF SAID LOCK OUT RELAY, MEANS PROVIDING A SIGNAL VOLTAGE WHEN SAID ENGINE IS RUNNING, AND A CIRCUIT FOR COUPLING SAID SIGNAL VOLTAGE TO THE COIL WINDING OF SAID LOCK OUT RELAY.