Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Reexamination Certificate
1998-02-26
2001-01-23
Font, Frank G. (Department: 2877)
Optics: measuring and testing
Angle measuring or angular axial alignment
Apex of angle at observing or detecting station
C033S276000
Reexamination Certificate
active
06177987
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a laser level, and more particular to an instrument in which a laser device is provided inside a buoy which floats on a liquid in a transparent container, the laser beams emitted from the buoy being always kept horizontal and perpendicular to provide precise level measurement.
2. Description of the Prior Art
Since laser beams have good stability and linearity, lasers are generally used in measuring instruments. However, as the surface on which the laser equipment is erected is not always level even with the use of a tripod, the laser beams emitted are not horizontal or perpendicular.
SUMMARY OF THE INVENTION
The present invention relates generally to a laser level, and more particular to an instrument in which a laser device is provided inside a buoy which floats on a liquid in a transparent container, the laser beams emitted from the buoy being always kept horizontal and perpendicular to provide precise level measurement.
A primary object of the present invention is to provide a laser level, in which a laser generating device is disposed inside a buoy which floats on a liquid in a transparent container, the laser beams emitted from the buoy being always kept horizontal and vertical to achieve precise horizontal and vertical measurements.
The foregoing objects and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.
Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
REFERENCES:
patent: 5619802 (1997-04-01), Rando et al.
patent: 5754287 (1998-05-01), Clarke
A & J
Font Frank G.
Stafira Michael P.
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