Air flow switch

Details Air flow switch Air flow switch

1978-03-27

1979-05-01

Tolin, Gerald P.

Electrical resistors

With switch

200 819R, 307118, 337140, 337395, H01H 3750

Patent

active

041526880

ABSTRACT:
An electrical switch responsive to air flow having an insulated base with a snap action switch mounted thereupon. The snap action switch with an actuating pin impinging on one end of a bar that is mounted on a pivot and axially movable. The other end of the bar extends to clamp an alloy wire exhibiting a high linear coefficient of expansion and which is tied to a spring fixed on the insulated base. From same said spring a second alloy wire is extended to a fixed point on the insulated based in close proximity to the clamp on the bar. The first alloy wire is internally heated by a fixed voltage, the second alloy wire is internally heated by a voltage that is less than the fixed voltage and which is applied only when the snap action switch is deactuated. The second alloy wire provides means for obtaining temperature compensation and smaller differential between the actuating and deactuating air flow.

REFERENCES:
patent: 2493603 (1950-01-01), Thomas
patent: 2598808 (1952-06-01), Ledin

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