Automatic automobile lighting control circuit with time delay-deenergizing means

Claim 1

IN AN AUTOMOBILE HAVING A STORAGE BATTERY AND AN ELECTRICAL IGNITION SYSTEM INCLUDING AN IGNITION SWITCH, A CONTROL CIRCUIT FOR AUTOMATICALLY DISCONNECTING AN ELECTRICAL LOAD FROM SAID STORAGE BATTERY AFTER A FIXED DELAY FROM THE TIME OF OPENING SAID IGNITION SWITCH; COMPRISING A RELAY HAVING NORMALLY OPEN CONTACTS, CONNECTED BETWEEN THE AUTOMOBILE BATTERY AND THE LOAD TO BE CONTROLLED, AND AN OPERATING COIL; A RESISTOR CONNECTED FROM THE LOAD CONTACT OF SAID RELAY TO ITS COIL FOR ENERGIZING SAID COIL WHEN SAID CONTACTS ARE CLOSED; MEANS CONNECTING SAID RELAY COIL TO SAID IGNITION SWITCH FOR ENERGIZING SAID COIL WHENEVER SAID IGNITION SWITCH IS CLOSED; A REGENERATIVE TRIGGER CIRCUIT CONNECTED ACROSS SAID RELAY COIL FOR SHORT CIRCUITING SAID COIL UPON CONDUCTION OF SAID TRIGGER CIRCUIT; MEANS FOR BIASING SAID TRIGGER CIRCUIT INTO NON-CONDUCTION WHENEVER SAID IGNITION SWITCH IS CLOSED; AND A DISCHARGE CIRCUIT CONNECTED TO BE CHARGED WHEN SAID IGNITION SWITCH IS CLOSED AND TO DISCHARGE WHEN SAID IGNITION SWITCH IS OPENED, SAID DISCHARGE CIRCUIT BEING ARRANGED TO BIAS SAID TRIGGER CIRCUIT CONDUCTIVE UPON DISCHARGE.