Signals and indicators – Alarms – Fluid-pressure variation
Patent
1980-11-24
1982-12-28
Stephan, Steven L.
Signals and indicators
Alarms
Fluid-pressure variation
116DIG25, 34 89, G01L 1912, G08B 300
Patent
active
043655823
ABSTRACT:
A differential pressure signal device employing an audible vibratory reed assembly having the property of being activated automatically upon being subjected to a predetermined energy level. The assembly is preferably all plastic and includes a unique rockable flapper valve that is automatically activated when the differential in pressure between two chambers reaches a predetermined level. The opening of said valve provides a large inrush of air that activates and operates the audible vibration of said reed until the differential in pressure is lowered below said predetermined level.
REFERENCES:
patent: 877581 (1908-01-01), Moore
patent: 3736900 (1973-06-01), Nowicki
patent: 4091762 (1978-05-01), Ruehl
Boyer David C.
Ruehl William E.
Buckman Thomas W.
Corr Denis E.
Forsberg Jerold M.
Halvorsen Jack R.
Illinois Tool Works Inc.
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