Pressure sensitive leveling device

Details Pressure sensitive leveling device Pressure sensitive leveling device

1985-09-18

1987-03-24

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33367, G01C 504

Patent

active

046514333

ABSTRACT:
A leveling device includes a first and second pressure cell that are interconnected by lengths of fluid filled, flexible tubing. Each of the pressure cells is associated with a strain gauge for sensing the differential pressure of the fluid between a region associated with each of the tubing lengths. An indicating means associated with the strain gauges indicates, in response to a differential in fluid pressure sensed by the strain gauges, the elevation of either of the pressure cells relative to the position of the other cell. In one form of the invention, provision of a single tubing conduit between the strain gauges reduces the probability of erroneous measurements due to pressure fluctuations within the tubing. In alternate forms of the invention, an agitating means is associated with flexible bellows structure coupled to the tubing so that hysteresis of the fluid is substantially reduced.

REFERENCES:
patent: 2438758 (1948-03-01), Leach
patent: 3645135 (1972-02-01), Hadley
patent: 3853006 (1974-12-01), Lawford
patent: 4368639 (1983-01-01), Owens
patent: 4375764 (1983-03-01), Lawford et al.
patent: 4379367 (1983-04-01), Legris
patent: 4541285 (1985-09-01), Hafner

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