Thaw alarm for food freezer

Details Thaw alarm for food freezer Thaw alarm for food freezer

1977-08-09

1979-03-13

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6183, 2483111A, G08B 2100

Patent

active

041445325

ABSTRACT:
A device having a single elongated non-metallic sealed container provided with electrical contacts is connected by appropriate electrical wiring to an alarm device. The electrical contacts are in a circuit with a displaceable electrically conductive member which may bridge the contacts for completing the circuit to the alarm device. A re-useable congealable material is contained within the sealed container, the congealable material having a predetermined low congealation temperature for maintaining the electrically-conductive member above the contacts as long as the device is at the suitable low temperature. On subjection of the sealed container to a sufficiently high temperature for a sufficient period of time, the congealable material takes on a liquid state and the electrically-conductive member is allowed to fall toward and bridge the contacts, thereby permitting electrical closure of the contacts when an undesirable temperature condition is present within the freezer compartment.

REFERENCES:
patent: 2601142 (1952-06-01), Hubbard
patent: 2809368 (1957-10-01), Ehlers, Jr.
patent: 2923786 (1960-02-01), Jones
patent: 3182337 (1965-05-01), Price
patent: 3423059 (1969-01-01), Kahn
patent: 3896278 (1975-07-01), Murawski

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