Self-leveling construction alignment laser

Details Self-leveling construction alignment laser Self-leveling construction alignment laser

1975-10-20

1977-10-11

Corbin, John K.

Optics: measuring and testing

Fiducial instruments

Artificial reference

33DIG21, 350 16, 356138, 356172, G01C 918

Patent

active

040532380

ABSTRACT:
The specification discloses an improved system for projecting and utilizing a light beam as a reference line for construction purposes. The system includes a light beam projection device mounted in a housing. A light path compensator is positioned within the housing and intercepts the beam of light emitted by the light beam projecting device and automatically corrects slight deviations of the light beam from true horizontal. A vertically adjustable leg is attached to the front end of the housing and a horizontally pivotable leg is attached to each side of the housing near the rear end of the housing to enable leveling and centering of the housing in a conduit or positioning and leveling on any surface. Structure is controllable from the rear of the housing to deflect the light beam in a vertical plane to vary the grade of the beam projected by the device. An indicator, readable from the rear of the housing, is provided for indicating the grade at which the light beam is projected. Structure is connected between the support legs and housing for rotating the housing in a horizontal plane to provide azimuthal adjustment of the light beam projected therefrom.

REFERENCES:
patent: 3488854 (1970-01-01), Trice
patent: 3631601 (1972-01-01), McNulty
patent: 3684381 (1972-08-01), Zoot
patent: 3894805 (1975-07-01), Middleton
patent: 3897637 (1975-08-01), Genho
patent: 3905707 (1975-09-01), Feist et al.
patent: 3910704 (1975-10-01), Richarme

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