Optics: measuring and testing – Fiducial instruments – Artificial reference
Patent
1996-12-24
1998-08-04
Hantis, K.
Optics: measuring and testing
Fiducial instruments
Artificial reference
33283, G01C 916
Patent
active
057902488
ABSTRACT:
The present invention provides a laser beam levelling device which is provided with two rotatable heads wherein a horizontal laser plane can be emitted from the first head which is rotatable round a vertical axis and a vertical laser plane can be emitted from the second head which is rotatable round a horizontal axis. An apparatus consisting of two separate pendulums is provided for self-levelling of the two laser planes. One pendulum is mounted substantially in the lower extension of the axis of rotation of the first head. The other pendulum is arranged to the side of it in its own vertical axis. The first pendulum is pivotal about a substantially horizontal axis and the second pendulum about an axis which is also horizontal and at right angles thereto. A laser beam produced by a laser light source is guided by reflectors such that it is deflected from one pendulum to the other pendulum and from there into the rotating heads. For this purpose, the reflector of the pendulum passed second by the laser beam is designed as a pentagonal light-splitting prism which splits the laser light 50--50.
REFERENCES:
patent: 5033848 (1991-07-01), Hart et al.
patent: 5075977 (1991-12-01), Rando
patent: 5218770 (1993-06-01), Toga
patent: 5331395 (1994-07-01), Piske et al.
Ammann Lasertechnik AG
Hantis K.
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