Defrost heater with spiral vent

Details Defrost heater with spiral vent Defrost heater with spiral vent

1994-11-10

1996-08-13

Walberg, Teresa J.

Electric heating

Heating devices

With heating unit structure

62276, 62277, H05B 308, F25B 4700

Patent

active

055458785

ABSTRACT:
A defrost heater for a refrigerator, freezer or other appliance having evaporator coils upon which moisture condenses and freezes includes a glass tube having an electrical resistance heating wire within the tube. A pair of connectors on opposite ends of the tube support a conductor for supplying electrical energy to the resistance heating wire. A spiral vent path in at least one of the conductors circumscribes the surface of the conductor and engages the outer surface of the tube to thereby provide an elongated, circuitous vent path which permits venting of air within the tube as it is heated, but prevents moisture from being drawn into the tube. A resilient sealing member defines a bore receiving the conductor to prevent moisture from entering the connector around the conductor.

REFERENCES:
patent: 3359750 (1967-12-01), Hanson
patent: 4156128 (1979-05-01), Craven
patent: 4186369 (1980-01-01), Attridge
patent: 4369350 (1983-01-01), Kobayashi
patent: 4376244 (1983-03-01), Gellert
patent: 4388523 (1983-06-01), Keep

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