Household refrigerator including improved defrostable evaporator construction

Claim 1

A REFRIGERATOR COMPRISING A STORAGE COMPARTMENT AND AN EVAPORATOR CHAMBER SEPARATE FROM SAID COMPARTMENT AND CONTAINING AN EVAPORATOR NORMALLY OPERATING AT FROST COLLECTING TEMPERATURES, MEANS FOR CIRCULATING AIR FROM SAID COMPARTMENT THROUGH SAID EVAPORATOR CHAMBER IN HEAT EXCHANGE RELATIONSHIP WITH SAID EVAPORATOR, SAID EVAPORATOR COMPRISING A PLURALITY OF SPACED SECTIONS, EACH OF SAID SECTIONS INCLUDING A PLURALITY OF SPACED TRANSVERSE TUBULAR REFRIGERANT CONDUITS AND A PLURALITY OF SPACED LONGITUDINALLY EXTENDING WIRES CONNECTED TO SAID CONDUITS, AND IN WHICH THE RATIO OF CONDUIT SURFACE TO WIRE SURFACE IS FROM 1:2 TO 1:4, A RADIANT HEATER FOR PERIODICALLY WARNING SAID EVAPORATOR TO DEFROST TEMPERATURES COMPRISING A TUBE OF INSULATING HEAT TRANSMITTING MATERIAL, AND A RADIANT HEATER COIL IN SAID TUBE EXTENDING SUBSTANTIALLY THE FULL LENGTH THEREOF, AND MEANS FOR MOUNTING SAID HEATER BETWEEN AND SPACED FROM ADJACENT SECTIONS OF SAID EVAPORATOR WITH SAID TUBE EXTENDING TRANSVERSELY THEREOF, THE LENGTH OF SAID TUBE BEING SUBSTANTIALLY EQUAL TO THE WIDTH OF SAID EVAPORATOR WHEREBY SUBSTANTIALLY ALL PORTIONS OF SAID CONDUITS AND WIRES ARE DIRECTLY EXPOSED TO RADIANT HEAT FROM SAID HEATER.