Refrigeration – Automatic control – By accumulation on freezing surface – e.g. – ice
Patent
1980-03-31
1982-08-31
Makay, Albert J.
Refrigeration
Automatic control
By accumulation on freezing surface, e.g., ice
62155, F25D 2102
Patent
active
043465641
ABSTRACT:
The accumulation of ice on a surface such as an evaporator fin in a refrigerator unit is detected by a mechanical probe which is moved by a bimetal bender element upon periodic timer-controlled energization of a bimetal heater so as to pass over the surfaces of an evaporator fin. If the movement of the probe is obstructed by ice on the evaporator fin surfaces a switch is operated by a bistable mechanism, causing energization of a defrosting heater and switching off the refrigerator compressor motor. If no ice is detected the probe returns to its original reset position without operating the defrost control switch.
REFERENCES:
patent: 2180071 (1939-11-01), Smith
patent: 2713249 (1955-07-01), Schordine
patent: 3350894 (1967-11-01), Thorner
patent: 3546894 (1970-12-01), Esche
Baehr Burghard
Gemma Mario
Makay Albert J.
Ranco Incorporated
Tanner Harry
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