Film cassette with lock-out means for preventing load of exposed

Details Film cassette with lock-out means for preventing load of exposed Film cassette with lock-out means for preventing load of exposed

1990-07-31

1991-09-10

Mathews, A. A.

354217, 3542891, G03B 1726, G03B 1736

Patent

active

050477943

ABSTRACT:
A film cassette comprises a film spool supported inside a lighttight cassette shell for rotation to thrust a filmstrip coiled about the spool to the exterior of the shell whether the filmstrip is unexposed or is only partly exposed, and a film exposure status indicator supported for rotation relative to the shell from an unexposed position to respective partly exposed and fully exposed positions for providing visible indications that the filmstrip is only partly exposed or is substantially exposed. The status indicator includes integral lock-out means capable of being detected for the purpose of preventing insertion of the film cassette into various cameras intended to be used with the film cassette. A cap for covering the lock-out means to prevent the lock-out means from being detected includes respective window-like means for revealing the lock-out means when the status indicator is in its partly exposed and fully exposed positions. Thus, the film cassette can be used with a relatively simple camera intended to receive the film cassette only with fresh unexposed film and a more complex camera intended to receive the film cassette with unexposed or partly exposed film.

REFERENCES:
patent: 2282044 (1942-05-01), Fairbanks
patent: 2924158 (1960-02-01), Kopp et al.
patent: 3086862 (1963-04-01), Eagle et al.
patent: 3768894 (1973-10-01), Cook
patent: 4887110 (1989-12-01), Harvey
patent: 4894673 (1990-01-01), Beach
patent: 4903053 (1990-02-01), Harvey
patent: 4987437 (1991-01-01), Pagano et al.

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