Refrigeration apparatus

Claim 1

REFRIGERATION APPARATUS COMPRISING CABINET MEANS HAVING A FIRST COMPARTMENT TO BE COOLED AND A SECOND COMPARTMENT; A FIRST CIRCUIT INCLUDING MEANS FOR CONTINUOUSLY CIRCULATING REFRIGERANT, AN EXPANSION MEANS AND AN EVAPORATOR MEANS DISPOSED IN SAID SECOND COMPARTMENT; MEANS FOR COOLING SAID FIRST COMPARTMENT OVER AN EXTENDED PERIOD INCLUDING MEANS FOR CYCLING AN AIR CIRCULATING MEANS TO CIRCULATE COLD AIR FROM SAID SECOND COMPARTMENT TO SAID FIRST COMPARTMENT IN RESPONSE TO TEMPERATURE RISES IN SAID FIRST COMPARTMENT DURING SAID EXTENDED PERIOD; BAFFLING MEANS ADAPTED TO RETAIN AIR SURROUNDING SAID EVAPORATOR MEANS AGAINST CONVECTION CIRCULATION BETWEEN SAID COMPARTMENTS; A SECOND CIRCUIT CONNECTED TO SAID FIRST CIRCUIT AND INCLUDING MEANS FOR BYPASSING SAID EXPANSION MEANS AND MEANS FOR CIRCULATING SAID BYPASSED REFRIGERANT IN HEAT-TRANSFER RELATIONSHIP WITH SAID EVAPORATOR MEANS IN RESPONSE TO A DEFROST SIGNAL; AND CONTROL MEANS INCLUDING MEANS FOR GENERATING SAID DEFROST SIGNAL FOR A SHORT PERIOD AT AN END OF SAID EXTENDED PORTION AND MEANS FOR DISABLING SAID AIR CIRCULATION MEANS IN RESPONSE TO SAID DEFROST SIGNALS; SAID DEFROST SIGNAL GENERATING MEANS COMPRISING A TIMING MEANS OPERATIVE TO PROVIDE PREDETERMINED EXTENDED COOLING PERIODS AND SHORT DEFROST PERIODS.