Gear driven alidade assembly

Details Gear driven alidade assembly Gear driven alidade assembly

1993-08-17

1995-06-06

Will, Thomas B.

Geometrical instruments

Straight-line light ray type

Level

33299, G01C 1500

Patent

active

054210968

ABSTRACT:
An alidade surveying instrument, comprising a pair of gimbeled yokes, a mounting base supporting the pair of gimbeled yokes for rotation on axes perpendicular to one another, a ranging device carried by the gimbeled yoke pair for targeting a remote object both as to elevation and azimuth, a first gear set coupled to one of the yokes and second gear set coupled to the other yoke, a pivot plate supporting one of the gears of each gear set for a varying degree of gear meshing with respect to its associated gear, and a spring for applying a variable force to the pivot plate for driving the gears of each gear set into a yielding engagement to counteract physical variations in the degree of gear set engagement as the gears of each set mesh and rotate relative to one another.

REFERENCES:
patent: 3092911 (1963-06-01), Lotzuesell
patent: 4202110 (1980-05-01), Kool
patent: 4771545 (1988-09-01), Hisayasu et al.
patent: 4907882 (1990-03-01), Waiber et al.
patent: 5108177 (1992-04-01), Middleton

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