Level sensing unit and a level indicating device based thereon

Details Level sensing unit and a level indicating device based thereon Level sensing unit and a level indicating device based thereon

1986-08-28

1987-08-11

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33378, G01C 906

Patent

active

046852182

ABSTRACT:
There is described a level sensing unit which is simple to operate, rugged in construction, sensitive to angular deviations of about 4 minutes 30 seconds, relatively inexpensive to construct, and very reliable. The unit is a sealed housing containing two communicating channels as fluid reservoirs opening into a compartment with an axle mounted between the channels and a float for each channel pivotally connected to the axle. Each float has an electrically conductive extension in electrical contact with the axle and directed toward a strip of similarly conductive material mounted within the housing. When the channels are filled with a nonconductive reactive fluid the extensions are in electrical contact with the strips when the floats are in a level condition, and the extensions become electrically disengaged through a buoyant force exerted on one float when the device is rotated so as to deviate from level.

REFERENCES:
patent: 738407 (1903-09-01), Cable
patent: 1552691 (1925-09-01), Girvin
patent: 3660840 (1972-05-01), Plofchan
patent: 3911592 (1975-10-01), Crask
patent: 4152839 (1979-05-01), McDonald
patent: 4590680 (1986-05-01), Hanchett et al.

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