Measuring and testing – Fluid pressure gauge – Bourdon
Patent
1986-01-15
1987-05-26
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Bourdon
72367, 73756, G01L 704
Patent
active
046675175
ABSTRACT:
In general, the invention features a spring assembly for a gauge comprising a hollow metal tube adapted to change in volume in response to differential pressures applied across its walls, the tube having a neck portion adapted to be connected to a fitting of the gauge, a body portion connected at one end to the neck portion, the walls of the body portions being flattened and their peripheral portions being compressed by cold working to a reduced thickness to thereby increase their yield point to a spring temper and their central portion being compressed relatively less than their peripheral portions to form an axially extending channel which provides for enhanced pressure transmission along the tube, and the other end of the body portion being sealed, the interior of the neck portion adapted to be in pressure communication with the fitting, and the interior of the body portion adapted to be in pressure communication through the channel with the interior of the neck portion, whereby a change in the pressure applied to the fitting is communicated along the interior of the body portion through the channel changing the differential pressure across the walls of the body portion and causing a corresponding change in the volume.
REFERENCES:
patent: 1521343 (1924-12-01), Townsend
patent: 1714988 (1929-05-01), Schlaich
patent: 2495314 (1950-01-01), Caldwell
patent: 2522780 (1950-09-01), Dickson
patent: 3232116 (1966-02-01), Perkins
patent: 3382720 (1968-05-01), Young
patent: 3986400 (1976-10-01), Schmaus
patent: 4191056 (1980-03-01), Holden
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