Rapid-focus binocular

Details Rapid-focus binocular Rapid-focus binocular

1982-06-07

1984-09-11

Corbin, John K.

G02B 2300

Patent

active

044706715

ABSTRACT:
A binocular with a multiple-helicoid focus-adjusting mechanism, in which the internal helicoid is integrally mounted on an ocular-lens bridge member and in mesh with the external helicoid provided in the rear portion of a center shaft. The center shaft is coaxially supported in an objective-lens hinge member and integrally connected through the intermediary of a connecting pin to a knob, which is rotatably mounted on the hinge member. By the help of the multiple-helicoid mechanism, the ocular-lens bridge member is smoothly moved and steadily supported, and the most protrusible position of the ocular-lenses is easy to be adjusted without an addition such as a washer.

REFERENCES:
patent: 3540792 (1970-11-01), Akin, Jr.
patent: 4066329 (1978-01-01), Van Exel

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