Signals and indicators – Indicators – Temperature responsive or compensating means
Patent
1982-11-05
1985-04-09
Stearns, Richard R.
Signals and indicators
Indicators
Temperature responsive or compensating means
374102, 116281, G01K 300, G01K 1108
Patent
active
045094497
ABSTRACT:
An elongated container, open at end, is nearly filled with frozen fluid. Urethane foam insulation around the container admits access only to the open end of the container with the frozen fluid level below the insulation. An elongated heat conducting indicator member fits loosely within the container so that fluid may pass therebetween. An elastic band over the end of the indicator/conductor and around the base of the insulation maintains an end of the indicator/conductor in contact with the frozen fluid. The indicator/conductor is calibrated in degree-hours or other temperature-time units. The indicator/conductor may be a hollow flat-bottomed tube with air inside acting as the heat conductor from the exterior air to the contact end of the block of frozen fluid. An alternate indicator/conductor may be a thin heat conducting member surrounded by insulation and contacting a heat receptor at the outside end and a heat transmitter at the inside end contacting the frozen fluid, both of which are broader than the thin conducting member. The entire limit indicator may be encased in a thin plastic shell to prevent tampering with the device. A spring or elastic may be used within the shell to maintain contact. A membrane may contain the fluid until frozen, when the membrane may be broken for contacting the indicator/conductor to the frozen fluid. The indicator/conductor may be secured in place by a pin therethrough against the shell. A simple heat conducting rod is another alternate type of indicator/conductor member.
REFERENCES:
patent: 646217 (1900-03-01), Hollingsworth
patent: 2472757 (1949-06-01), Raspet
patent: 2788282 (1957-04-01), Hammond
patent: 2915405 (1959-12-01), Hammond
patent: 3339417 (1967-09-01), Richard
patent: 3414415 (1968-12-01), Broad
patent: 3759103 (1973-09-01), Volk
patent: 3965741 (1976-06-01), Wachtell
patent: 4143617 (1979-03-01), Youngren
Corr Denis E.
Meeker Donald W.
Stearns Richard R.
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