Warning signal producing device for protective breathing apparat

Details Warning signal producing device for protective breathing apparat Warning signal producing device for protective breathing apparat

1979-05-09

1981-02-10

Yasich, Daniel M.

Signals and indicators

Alarms

Fluid-pressure variation

116276, 12820222, 137557, G01L 1912, F16K 3700

Patent

active

042494737

ABSTRACT:
A warning device for indicating a reduction of breathing gas supply pressure in an air breathing conduit includes a warning device member disposed in the breathing conduit which has a connection to the gas supply and is movable in response to a drop in the air supply pressure beyond the predetermined amount into at least a partially blocking position so as to increase the flow resistance through the breathing conduit so that the patient using the device is warned by the condition. The device includes a correction element connected to the conduit which moves the warning member in a direction away from the blocking position so that the warning cycle is again initiated.

REFERENCES:
patent: 3311125 (1967-03-01), Beasley
patent: 3785333 (1974-01-01), Warncke et al.
patent: 3870012 (1975-03-01), Metivier
patent: 4116156 (1978-09-01), Draxler
patent: 4127122 (1978-11-01), Kienhufer et al.

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