Theodolite with a disengageable adjustment mechanism

Details Theodolite with a disengageable adjustment mechanism Theodolite with a disengageable adjustment mechanism

1998-09-24

2000-06-20

Fulton, Christopher W.

Geometrical instruments

Straight-line light ray type

Level

33285, 33 1N, 33281, 74 1085, 74398, 74425, G01C 102, F16H 116

Patent

active

060762667

ABSTRACT:
A theodolite that includes a stand, a telescope, a friction gear and a worm gear. The telescope is pivotally secured to the stand. The clutch plate is secured to the telescope for at least limited rotational movement upon pivoting of the telescope. The friction gear is mounted for rotation about substantially the same axis as rotation of the clutch plate. The worm gear is mounted to the stand and is in constant mesh with the friction gear so that rotation of the worm gear causes rotation of the friction gear. A device engages the friction gear with the clutch plate with a frictional force. The frictional force is adjustable to allow for adjustment of the telescope separately from the worm gear.

REFERENCES:
patent: 854999 (1907-05-01), Grauhering
patent: 1518473 (1924-12-01), Whaler
patent: 2667693 (1954-02-01), Baker
patent: 4084327 (1978-04-01), Kooi
patent: 4752126 (1988-06-01), Fujii
patent: 5689892 (1997-11-01), Beckingham
patent: 5887353 (1999-03-01), Beckingham

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