Defrost heater for cooling appliance

Details Defrost heater for cooling appliance Defrost heater for cooling appliance

1994-11-10

1996-09-03

Walberg, Teresa J.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

62276, H05B 306, F25D 2106

Patent

active

055525814

ABSTRACT:
A defrost heater for a cooling appliance, such as a refrigerator or freezer, which has multiple sets of evaporator coils includes a formed glass tube enclosing an electrical resistance wire. The glass tube is substantially bell-shaped, the opposite ends of which are mounted below one set of evaporator coils. The heater includes upwardly curving portions extending upwardly in the clearance between two of the sets of evaporator coils and a downwardly facing portion connecting the upwardly extending portions of the tube which lies adjacent to the lower edge of an upper set of evaporator coils. During refrigerator defrost cycles, the electrical resistance heating wire is actuated, which heats the air in the clearance between the two lower sets of coils to defrost the lower sets of coils, and also defrosts the upper set of coils due to the fact that the uppermost portion of the bell-shaped glass tube lies above the upper level of the lower coils and adjacent the lower edge of the uppermost set of evaporator coils, thereby permitting a single defrost heater to defrost all three sets of evaporator coils.

REFERENCES:
patent: 3359750 (1967-12-01), Hanson
patent: 3394559 (1968-07-01), Jones
patent: 3683636 (1972-08-01), Tobey
patent: 3930140 (1975-12-01), Pease
patent: 4251720 (1981-02-01), Bleckmann
patent: 4369350 (1983-01-01), Kobayashi

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