Signals and indicators – Alarms – Rain
Patent
1975-12-02
1977-03-08
Swisher, S. Clement
Signals and indicators
Alarms
Rain
116 70, 116114PV, 250303, G08B 100
Patent
active
040107086
ABSTRACT:
A differential pressure indicator including a remote sensing means is disclosed wherein a reference volume under predetermined pressure is employed as a standard, triggering an indicating mechanism when a second (measured) pressure falls above or below a predetermined threshold. The indicating mechanism may include a novel shaft which protrudes through the casing carrying thereon a source of radioactive material which is remotely monitored. Alternatively, the protrusion may be sensed as an impedance variation or additional visual indicator. In one embodiment, a plurality of the subject sensors are housed upon the blades of a helicopter. Upon sensing the changing pressure in the helicopter blade, the protruding element provides a radioactive source which is sensed in a conventional manner to provide a cockpit readout.
REFERENCES:
patent: 1289712 (1918-12-01), Evans
patent: 1950107 (1934-03-01), Guinn
patent: 2843077 (1958-07-01), Leefer
patent: 3154049 (1964-10-01), Smith
patent: 3221703 (1965-12-01), Kalustyan
patent: 3269186 (1966-08-01), Hebenstreit
patent: 3417727 (1968-12-01), Nemes
patent: 3677218 (1971-02-01), Dixon
patent: 3985318 (1976-10-01), Dominey
Keledy Francis C.
Nemes Laszlo
Corr Denis E.
Swisher S. Clement
Trodyne Corporation
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