Mislevel sensing device

Details Mislevel sensing device Mislevel sensing device

1987-01-12

1987-12-22

Stearns, Richard R.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33391, G01C 906, G01C 912

Patent

active

047138904

ABSTRACT:
An improved mislevel sensing device having a balanced pair of capacitive pick-up circuits includes a pendulously-suspended common electrode assembly comprising a leaf spring member in the available flexing length of which is located a centrally-disposed hole which effectively reduces the cross-sectional dimensions of the suspension leaf member in that area, consequently restricting the beam-like flexure of the leaf to that area and away from sharp stress-imparting edges of leaf-clamping members of the device. The device further includes means for readily adjusting its attitude with respect to a primary reference axis of the host instrument, and means for providing protection of the functional capacitive couples from variable stray capacitive fields arising within the instrument, and from the intrusion of capacitance-effecting ambient moisture.

REFERENCES:
patent: 2744335 (1956-05-01), Litman
patent: 2928183 (1960-03-01), Adams
patent: 3026429 (1962-03-01), Karpchuk
patent: 3083469 (1963-04-01), Herbst
patent: 3238631 (1966-03-01), Graf
patent: 3286357 (1966-11-01), Grumman
patent: 4077132 (1978-03-01), Erickson
patent: 4561299 (1985-12-01), Orlando et al.

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