Circuitry for electric oven

Claim 1

AN OVEN COMPRISING AN OVEN LINER AND AN ACCESS DOOR DEFINING A COOKING COMPARTMENT, A THREE WIRE SOURCE OF ELECTRICAL POWER SUPPLY, AT LEAST THREE HEATING ELEMENTS PROVIDED FOR SAID COMPARTMENT INCLUDING A LOWER BAKING ELEMENT, AN UPPER BROILING ELEMENT, AND A MULLION HEATER ADJACENT THE DOOR, TERMINALS FOR CONNECTION WITH HIGH AND LOW VOLTAGE POWER SOURCES, CIRCUIT CONTROL MEANS CONNECTED WITH SAID TERMINALS AND SAID HEATING ELEMENTS SELECTIVELY OPERABLE TO EFFECT BAKING, BROILING AND HIGH TEMPERATURE HEAT CLEANING OPERATIONS FOR SAID OVEN, WHEREIN FOR THE BAKING OPERATION SAID BAKING ELEMENT IS CONNECTED TO SAID HIGH VOLTAGE POWER SOURCE AND SAID MULLION ELEMENT AND BROILING ELEMENT ARE CONNECTED IN SERIES WITH EACH OTHER AND IN PARALLEL WITH SAID BAKING ELEMENT ACROSS SAID HIGH VOLTAGE POWER SOURCE, FOR SAID BROILING OPERATION SAID BROILING ELEMENT IS CONNECTED TO SAID HIGH VOLTAGE POWER SOURCE, AND FOR SAID HEAT CLEANING OPERATION ALL THREE OF SAID HEATING ELEMENTS ARE CONNECTED TO SAID POWER SOURCE TO EFFECT A RELATIVELY GRADUAL TEMPERATURE RISE IN SAID OVEN TO A RELATIVELY HIGH HEAT CLEANING TEMPERATURE, WHEREBY ONLY TWO OF THE POWER SUPPLY WIRES ARE USED DURING ANY PARTICULAR COOKING OR HEAT CLEANING OPERATION, A SEQUENCE TIMING MEANS CONNECTED WITH SAID CIRCUIT CONTROL MEANS FOR TIMING SAID BAKING AND HEAT CLEANING OPERATIONS, AND TEMPERATURE CONTROL SWITCH MEANS FOR CONTROLLING SAID HEATING ELEMENTS WHEN CONNECTED TO ESTABLISH SAID BAKING AND BROILING OPERATIONS RESPECTIVELY TO HOLD SELECTED BAKING TEMPERATURES AND A BROILING TEMPERATURE AND ALSO TO CONTROL SAID THREE HEATING ELEMENTS WHEN CONNECTED TO ESTABLISH SAID HEAT CLEANING OPERATION TO LIMIT THE TEMPERATURE RISE IN SAID OVEN TO A MAXIMUM RANGING FROM 750*F. TO 950*F.