Thermal signal device with timer

Details Thermal signal device with timer Thermal signal device with timer

1978-04-24

1981-11-24

Wayner, William E.

Refrigeration

With indicator or tester

Condition sensing

165 11R, 236 94, G01K 1300, F25D 2102

Patent

active

043016618

ABSTRACT:
An apparatus for indicating a rise in the temperature within a compartment of a refrigerator, above a pre-determined desired degree of temperature in the compartment. A hermetically sealed thermal responsive device is positioned within the compartment and is pre-set to close an electrical switch whenever the temperature within the compartment exceeds the pre-set temperature. The switch is in circuit with an indicating means and is normally open so long as the temperature in the compartment is below the pre-set temperature. A container positioned outside the refrigerator houses the indicating apparatus and a test switch for determining the operativeness of the system. A timer is included which indicates how long current has been flowing within the circuit to indicate how long the temperature within the compartment has exceeded the pre-set level.

REFERENCES:
patent: 1188603 (1916-06-01), Amrhein
patent: 2439331 (1948-04-01), Bean
patent: 2766439 (1956-10-01), Palm
patent: 3007320 (1961-11-01), Henkel
patent: 3510860 (1970-05-01), Christman
patent: 4107672 (1978-08-01), Van Riemsdijk

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