Gas flow indicator having a magnetic field sensitive switch that

Details Gas flow indicator having a magnetic field sensitive switch that Gas flow indicator having a magnetic field sensitive switch that

1978-03-27

1980-01-01

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Piston

340610, 340611, 73745, H01H 3538

Patent

active

041818350

ABSTRACT:
A gas flow indicator including an open-ended cylinder, a piston constrained within the cylinder to move between the ends thereof, and a reed switch positioned on the outside of the cylinder for responding to the position of a magnet secured to the piston is disclosed. The piston is closed at its end adjacent the output aperture of the cylinder and is open at its end adjacent the input aperture of the cylinder for defining a basin within the piston. A spring is positioned between the piston and the output aperture for forcing the piston away from the output aperture. Gas flowing in through the input aperture forces the piston toward the output aperture. An indication of the state of gas flow through the cylinder is provided in accordance with whether the switch is open or closed. The dimensions of the inner chamber in relation to the dimensions and positioning of the piston prevent oscillation of the piston at its position of equilibrium determined by the rate of gas flow and thereby prevents oscillations in the indication provided by the switch and also enables the gas flow indicator to respond to a wide range of gas flow rates.

REFERENCES:
patent: 2041726 (1936-05-01), Pray
patent: 2734960 (1956-02-01), Reynolds
patent: 2963563 (1960-12-01), Patterson
patent: 3363073 (1968-01-01), Bouguet
patent: 3515827 (1970-06-01), Beeken
patent: 3766779 (1973-10-01), Hoffman
patent: 3910112 (1975-10-01), Gerlach
patent: 3941957 (1976-03-01), Tilman
Air flow or air pressure sensing device, Brodsky, Poe and Bischoff, IBM Tech. Discl. Bull., vol. 9, No. 6, Nov. 66, pp. 624.

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