Pendulous compensator for light beam projector

Details Pendulous compensator for light beam projector Pendulous compensator for light beam projector

1989-07-14

1991-07-23

Evans, F. L.

Optics: measuring and testing

Angle measuring or angular axial alignment

Apex of angle at observing or detecting station

33291, 33391, 350500, 356250, G01C 110, G01C 500, G01C 912, G02B 2764

Patent

active

050338480

ABSTRACT:
A pendulous compensator for use in a light beam projector including a light beam source comprises first and second upper pulleys spaced from one another and secured to the light beam projector. First and second lower pulleys are positioned beneath the first and second upper pulleys and supported by filament strands, tapes, loops or the like extending around the upper and lower pulleys. A pendulum mirror is secured to and supported between the first and second lower pulleys for receiving a light beam from the light beam source and reflecting the light beam in a desired angular orientation relative to horizontal. The first and second lower pulleys in the pendulum mirror are supported such that the pendulum mirror is moved to compensate for tilting of the light beam projector. The first and second upper pulleys or a folding mirror may be controlled to select a grade angle relative to horizontal of a projected light beam. A portion of the light beam may also be directed to the rear side of the pendulum mirror to also provide for the projection of a substantially vertically oriented light beam from the projector.

REFERENCES:
patent: 2779231 (1957-01-01), Drodofsky
patent: 4679937 (1987-07-01), Cain et al.
patent: 4801791 (1989-01-01), Cain
patent: 4852265 (1989-08-01), Rando et al.
Dictionary of Mechanical Engineering, third edition, Nayler, pp. 98-99, 128, 209, 264 and 277.

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