Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1987-02-20
1989-01-03
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33363Q, G01C 906
Patent
active
047947039
ABSTRACT:
The invention relates to a navigational instrument for automatically controlling the stability of a mobile target, or locating the position of the target with respect to one of several reference planes. The arrangement includes a moving part A whose base G is weighted so that the moving part takes the form of an anchor which pivots about an axis B located on a fixed part fastened to or defined by the moving target. The base G of the moving part has two arms. In an AC embodiment of the invention, the arms are provided with electrically conductive windings and the fixed part includes two electrically conductive windings energized by alternating current. If the fixed part is tilted, one of the windings in the moving part will penetrate the fixed winding to a depth proportional to the tilt angle. At this point, an alternating current, proportional to the tilt angle, will be induced in the winding in the moving part. In another embodiment using a DC power source, the winding on the elements is replaced by variable resistor or potentiometer whose slide is actuated by a corresponding one of the moving anchor arms.
REFERENCES:
patent: 1988458 (1935-01-01), Minorsky
patent: 3490153 (1970-01-01), Harris
patent: 3727180 (1973-04-01), Lingel et al.
patent: 3791042 (1974-02-01), Bell
patent: 4094073 (1978-06-01), Parra
patent: 4507965 (1985-04-01), Stratton et al.
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