Two-speed telescope focusing mechanism

Details Two-speed telescope focusing mechanism Two-speed telescope focusing mechanism

Filed on

1977-07-13

Date issued

1978-12-19

Examiner

Evans, F. L.

Other Related Categories

350 47, 350255, G02B 710

Type

Patent

Status

active

Patent number

041303407

Description

ABSTRACT:
Focusing mechanism for a telescope utilized in geodetic instruments and the like comprises a pair of manually accessible ring members mounted coaxially of the line of sight axis at the eyepiece end of the telescope. Rapid image acquisition is effected by means of a first of the rings which is associated with a multiple lead screw element while fine focusing is obtained by means of the second ring member which operates a single screw thread drive for the draw tube focusing lens assembly.

REFERENCES:
patent: 2155570 (1939-04-01), Trautmann
patent: 3492059 (1970-01-01), Shio

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