Self-leveling device mounted on a rotating base for projecting l

Details Self-leveling device mounted on a rotating base for projecting l Self-leveling device mounted on a rotating base for projecting l

1996-03-12

1998-03-10

Will, Thomas B.

Geometrical instruments

Straight-line light ray type

Level

33DIG21, 356250, G01C 100, G01C 500

Patent

active

057247447

ABSTRACT:
The projector device for laser rays (4) is mounted on an apparatus which oscillates and is self-leveling (2, 3, 5) under the force of gravity whereby in the equilibrium position a ray is projected on one or more walls always in a perfectly horizontal position. The oscillating apparatus is interrupted in its oscillations by a manual mechanical brake (6, 7, 8 and 9). The device can rotate and includes a graduated ringnut (11) on which it is possible to read the angle of rotation of the laser ray with respect to a predetermined reference point.

REFERENCES:
patent: 3588249 (1971-06-01), Studebaker
patent: 3771876 (1973-11-01), Ljungdahl et al.
patent: 3807869 (1974-04-01), Hartley
patent: 3856409 (1974-12-01), Cindrich et al.
patent: 3858984 (1975-01-01), Denton et al.
patent: 4183667 (1980-01-01), Denton
patent: 4448528 (1984-05-01), McManus
patent: 4993161 (1991-02-01), Borkovitz
patent: 5144487 (1992-09-01), Hersey
patent: 5212889 (1993-05-01), Lysen
patent: 5218770 (1993-06-01), Toga
patent: 5331395 (1994-07-01), Piske et al.

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