Pressure fluid reservoir

Details Pressure fluid reservoir Pressure fluid reservoir

1984-12-31

1986-09-02

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

With pressure and/or temperature compensation

73745, 200 82E, 340 60, G01L 716, G01L 914, G01L 1904

Patent

active

046088709

ABSTRACT:
A pressure fluid reservoir comprising a cylinder with a reservoir connection, a piston displaceable in the cylinder and non-contact switch means for indicating piston positions. Between the reservoir connection and the piston, the cylinder encloses a pressure fluid chamber, which is intended for storing a pressure fluid such as hydraulic oil, brake pressure fluid or the like. Opposite the pressure fluid chamber, the piston defines a gas chamber. The non-contact switch indicating means comprise Reed contacts, for example, and are disposed outside the cylinder such that they are longitudinally adjustable along the cylinder. Adjustment is effected by a temperature-dependent adjusting means, embodied for instance as an expansion element. Permanent-magnet actuating means, for actuating the Reed contacts in a non-contacting manner are fixed in recesses in one side of the piston. The adjusting means adjusts the Reed contacts longitudinally such that when these contacts are actuated, the same pressure (p1) in the pressure fluid chamber is indicated, regardless of the temperature of the fluid in the pressure fluid reservoir.

REFERENCES:
patent: 3703616 (1972-11-01), Martin
patent: 3887899 (1975-06-01), Kawaguchi et al.
patent: 4107493 (1978-08-01), Nagara et al.
patent: 4181835 (1980-01-01), Stadler et al.

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