Geometrical instruments – Straight-line light ray type – Level
Patent
1994-05-24
1995-10-24
Will, Thomas B.
Geometrical instruments
Straight-line light ray type
Level
356149, 356250, 33DIG21, G01B 1126, G01C 912, G12B 500
Patent
active
054599326
ABSTRACT:
An automatic plumb, level and pointing tool uses a visible laser diode to project light beams in two modes through two windows. In the first mode of operation, the unit is able to project a plumb-up beam and a level beam of light while resting on a surface which is as much as five degrees out of level. In the second mode of operation the unit is able to project two orthogonal beams of light both approximately in the horizontal plane for aligning one or more reference lines. An accurate, low cost method of generating level and plumb beams and planes of light is disclosed. One method uses an approximately leveled platform combined with a weak optical correction. The approximate leveling is done using a single wire or coil spring pendulum element which allows the platform to level itself to within a small fraction of true level, and remaining correction is provided by a weak negative lens or a weak reverse telescope. In alternative embodiments, all leveling is accomplished using a very flexible coil spring as a pendulum element, or a chain link connection in combination with such a spring. Several accessories are disclosed for use with the laser tool.
REFERENCES:
patent: 2460836 (1949-02-01), Lovins
patent: 3684381 (1972-08-01), Zoot
patent: 3771876 (1973-11-01), Ljungdahl et al.
patent: 3807869 (1974-04-01), Hartley
patent: 3856409 (1974-12-01), Cindrich et al.
patent: 3897637 (1975-08-01), Genho
patent: 3936197 (1976-02-01), Aldrink et al.
patent: 4043679 (1977-08-01), George et al.
patent: 4062634 (1977-12-01), Kado et al.
patent: 4111564 (1978-09-01), Trice, Jr.
patent: 4119382 (1978-10-01), George et al.
patent: 4183667 (1980-01-01), Denton
patent: 4221483 (1980-09-01), Rando
patent: 4333242 (1982-06-01), Genho, Sr.
patent: 4448528 (1984-05-01), McManis
patent: 4679937 (1987-07-01), Cain et al.
patent: 4767208 (1988-08-01), Cain et al.
patent: 4781457 (1988-11-01), Hirano et al.
patent: 4852265 (1989-08-01), Rando et al.
patent: 4854704 (1989-08-01), Funazaki
patent: 4912851 (1990-04-01), Rando et al.
patent: 4993161 (1991-02-01), Borkovitz
patent: 5012585 (1991-05-01), DiMaggio
patent: 5075977 (1991-12-01), Rando
patent: 5108177 (1992-04-01), Middleton
patent: 5144486 (1992-09-01), Hart
patent: 5144487 (1992-09-01), Hersey
patent: 5159760 (1992-11-01), Spiegel et al.
patent: 5182863 (1993-02-01), Rando
patent: 5184406 (1993-02-01), Swierski
Ligtenberg Christiaan
Rando Joseph F.
Freiburger Thomas M.
Levelite Technology, Inc.
Will Thomas B.
LandOfFree
Automatic level and plumb tool does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic level and plumb tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic level and plumb tool will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1878965