Automatic laser plumb line

Details Automatic laser plumb line Automatic laser plumb line

1997-08-14

1999-11-30

Fulton, Christopher W.

Geometrical instruments

Straight-line light ray type

33283, 33281, 33286, 33391, 33DIG21, G01B 1126, G01C 1510

Patent

active

059920297

ABSTRACT:
A laser line device suitable for construction. The laser line instrument automatically aligns a vertical laser beam so that the beam is perpendicular to the earth's core. The laser module is connected to a pendulum which serves to automatically level the device. The pendulum is damped by permanent magnets. The bearing on which the pendulum is mounted serves as a portion of the electrical circuit of the device.

REFERENCES:
patent: 3911588 (1975-10-01), Ohneda
patent: 3936197 (1976-02-01), Aldrink et al.
patent: 4206550 (1980-06-01), Boyett et al.
patent: 4517749 (1985-05-01), Scotto
patent: 4852265 (1989-08-01), Rando et al.
patent: 5012585 (1991-05-01), DiMaggio
patent: 5509209 (1996-04-01), Swierski
patent: 5572796 (1996-11-01), Breda
patent: 5782003 (1998-06-01), Bozzo

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