Geometrical instruments – Straight-line light ray type – Alignment device
Patent
1998-02-17
2000-03-14
Hirshfeld, Andrew H.
Geometrical instruments
Straight-line light ray type
Alignment device
33281, 33283, 356138, G01C 1502, G01C 1514
Patent
active
060355409
ABSTRACT:
An automatic optical levelling, plumbing and verticality-determining appartus includes: a base, a supporting and driving means adjustably standing on the base for supporting a frame having a plumb device secured to a horizontality calibrator universally pendulously mounted on the frame, a pair of plumb-line illuminators respectively secured on a top and a bottom portion of the plumb device for emitting an upper and a lower optical beam towards a ceiling and a ground floor for calibrating a vertical plumb line, a horizontal-line illuminator and a vertical-line illuminator symmetrically disposed on opposite ends of a T-shaped adapter mounted on a top of the plumb device and the horizontality calibrator for respectively emitting a horizontal optical line and a vertical optical line for determining or calibrating a horizontal plane and a vertical plane.
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Hsiung Lin Chin
Wu Chyi-Yiing
Hirshfeld Andrew H.
Smith Richard A.
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