Door jamb post and valved vent passage with heater

Details Door jamb post and valved vent passage with heater Door jamb post and valved vent passage with heater

1985-08-30

1987-05-05

Joyce, Harold

62409, 62410, 98119, F25D 1704

Patent

active

046622705

ABSTRACT:
A door jamb for a cold storage room is provided with a tranverse passage for passage of air from the exterior into the interior of the cold storage room. A thin metal flap valve, specifically of stainless steel, is placed at the exterior end of the passage, seated on a flat plate. An electric heater in the passage prevents the valve from being immobilized in the closed position due to frozen condensation.

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patent: 3680329 (1972-08-01), Burtis
patent: 3813896 (1974-06-01), Lebahn
patent: 3826106 (1974-07-01), O'Hanlon et al.
patent: 3916643 (1975-11-01), Brown
patent: 3952542 (1976-04-01), Berkowitz
patent: 4116213 (1978-09-01), Kamezaki
patent: 4180093 (1979-12-01), Kamezaki
patent: 4235162 (1980-11-01), Schmidt
patent: 4257445 (1981-03-01), Cook et al.
patent: 4257458 (1981-03-01), Kondo et al.
patent: 4471812 (1984-09-01), Bertsch

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