Switch for sensing a selected ratio between two different pressu

Details Switch for sensing a selected ratio between two different pressu Switch for sensing a selected ratio between two different pressu

1975-05-14

1977-02-01

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

73407PR, 92 43, H01H 3532

Patent

active

040063291

ABSTRACT:
A device for providing a measurement of the value of the ratio of two pressures by sensing the position of a member that is urged in one direction by one pressure and oppositely by the other pressure with the element further having both pressures set against the same movable support of the element. A third pressure of essentially a high vacuum acts on the remainder of the element not acted on by the other pressures and minimizes the effects of temperature while enabling the device to be precise over a wide range of pressures.

REFERENCES:
patent: 2471838 (1949-05-01), Ross
patent: 2477233 (1949-07-01), Bristol
patent: 2697764 (1954-12-01), Burlingham
patent: 2850871 (1958-09-01), Drake
patent: 3046369 (1962-07-01), Hicks
patent: 3742165 (1973-06-01), Hellman

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