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

1990-10-15

1991-07-16

Hix, L. T.

354207, G03B 1726

Patent

active

050328611

ABSTRACT:
A film cassette comprises a film spool supported inside a lighttight shell for rotation to thrust a filmstrip coiled about the spool automatically to the exterior of the shell, and a film exposure status indicator supported for rotation relative to the shell from an unexposed position for providing a visible indication that the filmstrip is unexposed to an exposed position for providing a visible indication that the filmstrip is exposed. The status indicator includes a lock-out means arranged for engagement by a blocking member in a camera to prevent insertion of the cassette into the camera, when the status indicator is in the exposed position, and a cut-out located with respect to the lock-out means for receiving the blocking member to allow insertion of the film cassette into the camera, when the status indicator is in the unexposed position. The shell includes cam means aligned with the cut-out for moving the blocking member out of the way of the cassette, when the status indicator is the unexposed position, and covered by the lock-out means to be prevented from moving the blocking member out of the way of the cassette, when the status indicator is in the exposed position.

REFERENCES:
patent: 4423943 (1982-04-01), Gold
patent: 4834306 (1989-05-01), Robertson et al.
patent: 4846418 (1989-07-01), Fairman
patent: 4848693 (1989-07-01), Robertson
patent: 4875638 (1989-10-01), Harvey
patent: 4878075 (1989-10-01), Cannon
patent: 4887110 (1989-12-01), Harvey
patent: 4894673 (1990-01-01), Beach
patent: 4899948 (1990-02-01), Niedospial, Jr. et al.
patent: 4947197 (1990-08-01), Smart et al.

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