Geometrical instruments – Straight-line light ray type – Level
Patent
1998-01-20
2000-06-13
Hirshfeld, Andrew H.
Geometrical instruments
Straight-line light ray type
Level
33377, 33396, 356148, G01C 1514, G01C 1510
Patent
active
060733543
ABSTRACT:
An instrument for use in alignment, plumb and leveling functions includes a laser diode projecting a beam through a liquid contained in a vessel. Floating in the liquid is a compensator float which includes telescope optics so as to diminish the angle of rays leaving the telescope as compared to rays entering the telescope. The laser beam passes through the liquid and through the telescope, exiting from a window at the top or side of the instrument. By selecting the proper relationship between the telescope's magnification and the index of refraction of the liquid, the instrument is made to correct for small tilt angles of its housing. Various embodiments are disclosed for projecting upward or downward plumb beams, level beams or both.
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Freiburger Thomas M.
Hirshfeld Andrew H.
Levelite Technology, Inc.
Smith R. Alexander
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