Self-leveling and grade setting laser apparatus

Details Self-leveling and grade setting laser apparatus Self-leveling and grade setting laser apparatus

1980-11-03

1982-10-05

Corbin, John K.

Optics: measuring and testing

Fiducial instruments

356153, G01C 1500

Patent

active

043525601

ABSTRACT:
A pivotally-mounted laser or other collimated light beam source is maintained in a level position by means of a thermal motor capable of precise small movements. Actuation of the motor is accomplished by a control amplifier whose inputs are responsive to the output of a level-sensitive transducer. Pre-selected grades may be established and maintained by means of a second thermal motor which is employed to change the angular relationship between the pivotally mounted laser or light source and the level-sensitive transducer.

REFERENCES:
patent: 3876309 (1975-04-01), Zicaro et al.
patent: 3997267 (1976-12-01), Met
patent: 4119382 (1928-10-01), George et al.

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