Three-dimensional optical levelling, plumbing and angle-calibrat

Details Three-dimensional optical levelling, plumbing and angle-calibrat Three-dimensional optical levelling, plumbing and angle-calibrat

1995-05-30

1996-07-30

Fulton, Christopher W.

Geometrical instruments

Straight-line light ray type

Vertical angle

33281, 33286, 33DIG21, 356138, G01B 1126

Patent

active

055399908

ABSTRACT:
An optical levelling, plumbing and angle-calibrating instrument includes: a frame; a plumb body universally pendulously mounted on the frame and defining a vertical plumb line gravitationally; at least an illuminator electrically connected to a power supply and mounted on the plumb body for emitting laser light; and at least a cylindrical-surfaced lens mounted on the plumb body in front of the illuminator for planarly diverging the laser light as emitted from the illuminator through the lens to form a laser light plane transverse to a lens axis of the cylindrical-surfaced lens, whereby the laser light plane will projectively intersect an objective wall to form a straight line of optical image, serving as a reference line for levelling or plumbing use.

REFERENCES:
patent: 3964824 (1976-06-01), Dixon
patent: 4471530 (1984-09-01), Kirven
patent: 4836669 (1989-06-01), Teach
patent: 4993161 (1991-02-01), Borkovitz
patent: 5012585 (1991-05-01), DiMaggio
patent: 5144486 (1992-09-01), Hart
patent: 5184406 (1993-02-01), Swierski

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