Signals and indicators – Alarms – Fluid flow
Patent
1976-03-10
1977-07-19
Gill, James J.
Signals and indicators
Alarms
Fluid flow
G01K 1106
Patent
active
040361667
ABSTRACT:
Apparatus for indicating at a visually accessible location remote from an object whether the temperature of that object is then at or has at some time exceeded a certain predetermined temperature including a sensor assembly adapted to be fastened to the object, an indicator assembly located in the visually accessible location and a transmission member connecting the sensor and indicator assemblies. The sensor assembly includes in the preferred embodiment a pair of members releasably secured to each other by a fusible material whose fusion temperature is approximately that of the predetermined temperature to be indicated. The indicator assembly includes a plunger slidably disposed within a housing normally hidden from view and biased towards an exposed position. The plunger is restrained from moving to this position by the transmission member which in the preferred embodiment includes an elongate flexible member having one end attached to the plunger and its other end connected to one of the sensor assembly members. Upon the object reaching the predetermined temperature, the fusible material melts releasing the flexible element which permits the plunger to move to its exposed position thereby indicating that the object has reached the predetermined temperature.
REFERENCES:
patent: 2363711 (1944-11-01), Walsh
patent: 2532510 (1950-12-01), Nelson
Gill James J.
Walter Kidde & Company, Inc.
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