Method and apparatus for sensing fluid pressure

Details Method and apparatus for sensing fluid pressure Method and apparatus for sensing fluid pressure

1976-01-05

1977-02-08

Woodiel, Donald O.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200DIG79, H01H 3534

Patent

active

040073432

ABSTRACT:
A method and apparatus is disclosed for visually indicating when the pressure of a fluid, such as oil in an automobile, falls below a predetermined value. The improvement resides in a novel pressure switch which is typically connected in series in an electrical circuit with a power source and a visual indicator, such as a so-called "idiot light" in an automotive instrument panel. The pressure switch includes a housing with an internal recess and a fluid passageway extending from the internal recess for communication with a fluid under pressure. A resilient, flexible, elastomeric diaphragm overlies the passageway within the recess and is deflected in response to the fluid pressure. An annular, electrically conductive, stationary contact element is positioned adjacent to the diaphragm; and a spherical, electrically conductive contact element is biased by a coil spring toward the opening in the annular contact element and into engagement with the diaphragm. When the fluid pressure is below a certain predetermined value, the two contact elements are biased into engagement to close the circuit and provide an appropriate visual indication. When the fluid pressure is in excess of the predetermined value, deflection of the diaphragm displaces the spherical contact element and breaks the circuit.

REFERENCES:
patent: 1932428 (1933-10-01), Swezey
patent: 2744977 (1956-05-01), Lombard et al.

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