Two-speed continuous tangent screw

Details Two-speed continuous tangent screw Two-speed continuous tangent screw

1997-10-28

1999-03-30

Fulton, Christopher W.

Geometrical instruments

Straight-line light ray type

Level

33285, 33 1N, 33281, 74 8914, 74425, F16H 116, F16H 5517, G01C 102

Patent

active

058873538

ABSTRACT:
An adjustment mechanism for a telescope of a theodolite. The mechanism includes a worm gear that is coupled to a friction gear of the theodolite. The friction gear is coupled to the telescope so that any rotation of the gear will induce a corresponding movement of the scope. The worm gear is coupled to a linear screw and an outer sleeve. The linear screw has a shaft that can push the worm gear and rotate the friction gear to provide a fine movement of the telescope. The linear screw also has a stop that engages an arm of the sleeve. Continued rotation of the linear screw rotates the engaged sleeve and the worm gear to provide a coarse movement of the telescope. The linear screw is connected to a knob which can be rotated by an operator. The operator can induce a coarse movement of the telescope by turning the linear screw so that the stop engages the sleeve. The operator can induce a fine movement of the telescope by rotating the knob in a reverse direction so that the linear screw pushes the worm gear and rotates the friction gear.

REFERENCES:
patent: 4665763 (1987-05-01), James
patent: 5099805 (1992-03-01), Ingalls
patent: 5664457 (1997-09-01), Nejati

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