Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1975-03-19
1977-07-12
Phillips, Charles E.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 912, G01C 916
Patent
active
040344819
ABSTRACT:
An instrument is disclosed which comprises a liquid filled casing and a float structure in the casing. The float or floats of the float structure are fully submerged and this structure is mounted for rotation about a horizontal axis. The buoyancy force on the floats tends to return the float structure to a datum position and resist movement from that position. A gear system is provided for converting tilting movement of the casing with respect to the float structure into movement of a counterbalanced needle across a scale, the scale itself being mounted on the float structure. In a further disclosed form, the needle of a lower instrument has the casing of an upper, smaller but otherwise identical instrument secured thereto. In this form proximity sensors are used to detect movement of the needles with respect to the casings. Two floats are preferably employed, these being one to each lateral side of a mounting spindle of the float assembly and above a horizontal plane through the spindle.
REFERENCES:
patent: 1399423 (1921-12-01), Cunningham
patent: 1924761 (1933-08-01), Turner
patent: 2722056 (1955-11-01), Stimler
patent: 2959057 (1960-11-01), Winker
patent: 2995038 (1961-08-01), Singleton et al.
patent: 3078721 (1963-02-01), Sawyer
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