Aperture mechanism having a blade positionable in an open positi

Details Aperture mechanism having a blade positionable in an open positi Aperture mechanism having a blade positionable in an open positi

1994-01-05

1995-07-11

Gellner, Michael L.

3542341, 3542711, 354274, G03B 902, G03B 908

Patent

active

054325765

ABSTRACT:
An aperture mechanism includes at least one blade moveable along a path between a closed position and at least one open position. At least one hard stop is moveable between a first position, out of the blade path, and a second position in the blade path to position the blade in the open position when an edge of the blade contacts the hard stop. The hard stop is located out of a plane of movement of the blade when the hard stop is in the first position to simplify and make more accurate the positioning of the blade in the open position.

REFERENCES:
patent: Re25635 (1964-09-01), Nerwin
patent: 3233531 (1966-02-01), Fairbank
patent: 3405624 (1968-10-01), Peterson
patent: 4112450 (1978-09-01), Kondo
patent: 4760420 (1988-07-01), Lam
patent: 4797700 (1989-01-01), Tsuji et al.
patent: 4893142 (1990-01-01), Ishida et al.
patent: 5255037 (1993-10-01), Kobayashi
patent: 5337110 (1994-08-01), Dowe

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