Domestic electric appliance

Claim 1

IN A COOKING APPLIANCE COMBINATION WITH A POWER SUPPLY SWITCH MEANS, A TUBULAR SELF-CONTROLLED SHEATHED HEATING ELEMENT ADAPTED AS A SINGLE SOURCE OF COOKING HEAT FOR SAID COOKING APPLIANCE AND COMPRISING A TUBULAR SHEATH HAVING A FIXED END AND A FREE END AND ENCLOSING A RESISTANCE ELEMENT SPACED FROM SAID SHEATH BY A DIELECTRIC MATERIAL AND ENERGIZABLE THROUGH SAID SWITCH MEANS, SAID TUBULAR SHEATH BEING FORMED WITH A FIRST PORTION AND A SECOND PORTION HAVING RESPECTIVE CONTIGUOUS EDGES JOINED TOGETHER CONTINUOUSLY THROUGHOUT THE LENGTH OF THE HEATING ELEMENT, SAID FIRST PORTION HAVING A DIFFERENT COEFFICIENT OF EXPANSION THAN SAID SECOND PORTION WHEREBY SAID FREE END OF SAID HEATING ELEMENT IS CAUSED TO MOVE THERMALLY RESPONSIVELY WHEN SAID RESISTANCE ELEMENT IS ENERGIZED, SAID SWITCH MEANS HAVING ACTUATOR MEANS CONNECTED FOR ACTUATION WITH SAID FREE END OF SAID HEATING ELEMENT AND ACTUATABLE BY THE MOVEMENT OF SAID FREE END TO THERMALLY RESPONSIVELY ENERGIZE AND DE-ENERGIZE SAID HEATING ELEMENT WHEREBY THE ENERGIZATION AND DEENERGIZATION OF SAID HEATING ELEMENT IS ACCOMPLISHED WITHOUT AUXILIARY THERMOSTATIC MEANS.