Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1982-12-27
1985-04-09
Rowland, James L.
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
1375123, 137855, 128725, 12820423, 116270, F16K 3700
Patent
active
045095515
ABSTRACT:
An improved switching device for indicating the beginning and ending of the breath of a test subject. A flow through housing is provided with an inlet and first and second outlets. A flexible diaphragm is connected in series with the first outlet to serve as a check valve which opens during the high flow rate portion of a breath. A sensitive flow responsive member connected in series with the second outlet opens in response to the presence of gas flow during the low flow rate portion of the breath. A detecting circuit responsive to the position of the flow responsive member accurately signals the beginning and ending of a breath. A damping member connected to the flexible diaphragm prevents the latter from vibrating at low breath flow rates and thereby stabilizes the motion of the flow responsive member.
REFERENCES:
patent: 2773251 (1956-12-01), Snyder
patent: 2972345 (1961-02-01), Spigel
patent: 3357428 (1967-12-01), Carlson
patent: 3455314 (1969-07-01), Glick et al.
patent: 4190045 (1980-02-01), Bartels
patent: 4297899 (1981-11-01), Blaney et al.
patent: 4443671 (1984-04-01), Hinds
patent: 4456016 (1984-06-01), Nowacki et al.
Rowland James L.
Sensormedics Corporation
Tumm Brian R.
LandOfFree
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