Refrigerator door ajar alarm with variable delay

Details Refrigerator door ajar alarm with variable delay Refrigerator door ajar alarm with variable delay

1984-01-26

1986-01-28

Rowland, James L.

Refrigeration

With indicator or tester

Condition sensing

62128, 62131, 62231, 340522, 340527, 340585, G01K 1300, F25B 4900

Patent

active

045662851

ABSTRACT:
A door ajar alarm system for a refrigerator-freezer, the system having a variable alarm delay period. The door ajar alarm system includes a control which may be digital or analog for monitoring various operating conditions of the refrigerator such as the temperatures of the refrigerator compartments and whether the refrigerator is undergoing a defrost operation. The control determines the alarm delay period in accordance with the monitored conditions such that the delay period is decreased in response to each monitored condition which reaches a predetermined status. The door ajar alarm thus alerts the user to operating conditions which are likely to produce an undesirable temperature within the refrigerator more rapidly than usual or to produce temperatures from which recovery is unusually slow.

REFERENCES:
patent: 2455182 (1948-11-01), LaVallee
patent: 3786470 (1974-01-01), Greenhill
patent: 4012732 (1977-03-01), Herrick
patent: 4017843 (1977-04-01), Yanagishima
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patent: 4241337 (1980-12-01), Prada
patent: 4325223 (1982-04-01), Cantley
patent: 4358932 (1982-11-01), Helfrich, Jr.
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patent: 4411139 (1983-10-01), Bos
patent: 4463348 (1984-07-01), Sidebottom
patent: 4482785 (1984-11-01), Finnegan et al.
patent: 4490986 (1985-01-01), Paddock
patent: 4503419 (1985-03-01), Kidd et al.
patent: 4528558 (1985-07-01), Steers et al.
"Refrigerator Alarm", Elektor, vol. 2, No. 11, p. 1141, Nov. 1976.

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