Cable drive focusing mechanism for optical instruments

Details Cable drive focusing mechanism for optical instruments Cable drive focusing mechanism for optical instruments

1984-09-14

1987-08-04

Corbin, John K.

G02B 2126

Patent

active

046842250

ABSTRACT:
An adjusting mechanism for an optical instrument such as a microscope has a plurality of pulleys which are coupled together by a flexible, non-elastic cable. One of the pulleys is fixably rotated to a support member while the other pulleys are rotatably fixed to a movable member. The cable is further coupled to an adjusting shaft. Both ends of the cable are fixed to the support member. Rotation of the adjusting shaft takes up the cable on one side of the pulleys and pays out an exact and equal amount of cable on the opposite side of the pulleys. The pulleys fixed to the movable member are, consequently, moved a proportional amount. The movable member is displaced an exactly equal amount. The adjusting mechanism includes a counter balancing member which is adjustable to counteract the forces exerted upon the movable member.

REFERENCES:
patent: 2884788 (1959-05-01), Clark
patent: 3194080 (1965-07-01), Olson
patent: 4482221 (1984-11-01), Clark
patent: 4524520 (1985-06-01), Levy
IBM Technical Disclosure Bulletin, vol. 4, No. 9, Feb. 1962.

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