Geometrical instruments – Straight-line light ray type – Alignment device
Reexamination Certificate
1998-12-31
2001-01-30
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Straight-line light ray type
Alignment device
C033SDIG002, C033S374000, C033S375000, C362S259000
Reexamination Certificate
active
06178649
ABSTRACT:
BACKGROUND OF THE INVENTION
U.S. patent application Ser. No. 09/024,340 filed on: Feb. 17, 1998 by the same inventor, C. Y. Wu of this application disclosed an automatic optical levelling, plumbing, and verticality-determining apparatus having a plumb device secured with a horizontality calibrator universally pendulously mounted on the frame, in which a plurality of screws are provided for operatively adjusting the horizontality calibrator by slidably moving the inner ring of the calibrator about the longitudinal center of the pendulating stem of the plumb device until a gravity center of the plumb device is aligned with the plumb line of the plumb device as checked by a bubble level.
However, the screws used for the adjustment may cause deformation for the instrument elements having thin wall and may also accumulate stress as tightened by the screws during their adjustment, thereby gradually releasing the stress to further cause deviation from the horizontality or verticality, and influencing the measurement precision accordingly.
The present inventor has found the drawbacks of the conventional optical device and invented the present optical calibrating apparatus.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an optical calibrating apparatus including: a laser illuminator (
6
) disposed in an eccentric adjusting sleeve (
5
), an inner inclined adjusting sleeve (
4
) within a jacket (
3
), an outer inclined adjusting sleeve (
2
), and a cylindrical casing (
1
), in which a laser line is emitted by the illuminator (
6
) for checking levelling, plumbing and verticality and the laser line has been calibrated for a horizontality or a verticality by rotating the eccentric adjusting sleeve (
4
), the inner and outer inclined adjusting sleeves (
4
,
2
) until the emitted laser line is aligned with a standard laser line emitted from a standard optical calibrator or aligned with a mark preset by a standard instrument.
REFERENCES:
patent: 4897851 (1990-01-01), Vecht et al.
patent: 5323555 (1994-06-01), Jehn
patent: 5359781 (1994-11-01), Melville
patent: 5572796 (1996-11-01), Breda
patent: 5680208 (1997-10-01), Butler et al.
patent: 5912733 (1999-01-01), Dunlop et al.
De Jes{acute over (u)}s Lydia
Gutierrez Diego
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