Device for adjusting the angle of a sighting unit to a target

Details Device for adjusting the angle of a sighting unit to a target Device for adjusting the angle of a sighting unit to a target

2004-04-27

2008-08-19

Bennett, G. Bradley (Department: 2841)

Geometrical instruments

Straight-line light ray type

C033S321000, C033S290000

Reexamination Certificate

active

07412770

ABSTRACT:
The invention relates to a device for adjusting the angle of a sighting unit towards a target, in particular for a geodesic-measuring instrument. The inventive device comprises a reference base, at least one bearing for mounting the sighting unit thereon in such a way that it is pivotable with respect to said reference base around an axis, a gear for accurately adjusting an angle of rotation around said axis between the sighting unit and the reference base and a coupling unit for limiting or interrupting a torque flux around the axis. The gear and the coupling unit are in series arranged in the torque flux between the sighting unit and the reference base. The torque flux is carried out around the axis between the sighting unit and the reference base by means of the gear and the coupling unit when it is non-interrupted thereby. Said device is characterised in that the coupling unit is provided with at least one electromagnet for producing a magnetic field and the torque flux can be limited or interrupted according to the interruptibility of the magnetic field.

REFERENCES:
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patent: 2093503 (1937-09-01), Wittkuhns et al.
patent: 2133241 (1938-10-01), Baker
patent: 3200498 (1965-08-01), Argentieri
patent: 3508335 (1970-04-01), Sundstrom
patent: 4181867 (1980-01-01), Muller
patent: 5216310 (1993-06-01), Taghezout
patent: 5987763 (1999-11-01), Ammann et al.
patent: 6076266 (2000-06-01), Beckingham et al.
patent: 196 15 515 (1997-03-01), None

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