Optical angle measuring instrument

Details Optical angle measuring instrument Optical angle measuring instrument

1989-01-23

1990-09-25

Evans, F. L.

Optics: measuring and testing

Angle measuring or angular axial alignment

Apex of angle at observing or detecting station

33282, G01B 1126, G01C 108

Patent

active

049589270

ABSTRACT:
A manually-rotatable switch knob is provided on the alhidade of a sextant that is connected to a switching pin of hardened steel arranged eccentrically to the mounting of the knob. The switching pin engages the drum-screw mounting and, under the action of a stop spring, permits the drum screw to be switched back and forth between two stable stop locations when the knob is rotated. In the one stop location, the drum screw engages the limbus toothing. In the other location, the drum screw is completely disengaged from the limbus toothing so that the alhidade can be freely pivoted without risk of the drum screw damaging the limbus toothing during the movement of the alhidade. The stop spring also produces precisely defined contact pressure between the drum screw and the limbus toothing. The previously possible introduction of bending moments into the alhidade during rough adjustment is eliminated.

REFERENCES:
patent: 2439102 (1948-04-01), Rothweiler
patent: 3968570 (1986-07-01), Leuchter, Jr.

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