Geometrical instruments – Straight-line light ray type
Patent
1988-07-06
1990-04-03
Haroian, Harry N.
Geometrical instruments
Straight-line light ray type
33DIG21, 356138, G02B 714, G01B 1126
Patent
active
049128515
ABSTRACT:
A tool for use in establishing a precise level line or plumb line or line for alignment uses a visible laser diode for projecting the line. The tool is relatively small and compact, drives the laser diode using batteries contained in the tool, and includes tilt compensation for use on surfaces which are not level, up to about 5.degree. off level, for still delivering a truly plumb or truly horizontal beam. A manual selector device is provided for shifting the beam from a vertical orientation to a horizontal orientation when desired. Specific forms of tilt compensation apparatus are disclosed.
REFERENCES:
patent: 3729266 (1973-04-01), Mason et al.
patent: 3856409 (1974-12-01), Ginrich et al.
patent: 3897637 (1975-08-01), Genho
patent: 4333242 (1982-06-01), Genho et al.
Rando Joseph F.
Schwartz Henry L.
Davis Paul
Feix Donald C.
Freiburger T. M.
Haroian Harry N.
Spectra-Physics Inc.
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