Geometrical instruments – Straight-line light ray type – Structurally installed
Patent
1991-09-26
1992-09-15
Will, Thomas B.
Geometrical instruments
Straight-line light ray type
Structurally installed
33286, 172430, G01C 502
Patent
active
051466864
ABSTRACT:
A centerline sight apparatus includes a housing mounted on the forward end of a tractor with a sight arm operably mounted in the housing for transverse movement with respect to the longitudinal axis of the tractor. A second sight arm is operably mounted below the first sight arm and moves parallel to the first sight arm at a speed approximately twice as fast and in the same direction as the first sight arm. Both sight arms are connected to a motor which is responsive to movement of a pendulum, so as to move the sight arms in one direction of the other. The pendulum is mounted to sense the lateral cant of the tractor with respect to the tractor's longitudinal axis.
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