Photographic film cassette having a locking spool

Details Photographic film cassette having a locking spool Photographic film cassette having a locking spool

1992-10-21

1994-11-08

Gellner, Michael L.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

2423484, G03B 1726, G03B 104

Patent

active

053631676

ABSTRACT:
A photographic film cassette has photographic film wound on a spool and rotatably contained in a cassette shell. A leader of the photographic film is advanced outward from a passage mouth when the spool is rotated in the unwinding direction. The spool has a toothed wheel. A spring plate is provided inside the cassette shell. The spool is stopped by the spring plate from rotating. The spool is allowed to rotate when a torque of at least 50 gf.multidot.cm is applied to the spool. While a camera is loaded with the novel cassette, the spring plate is displaced to make the spool free from the toothed wheel to rotate. In another preferred embodiment, the spool is provided with a biased stopper, which is pressed with friction against the inside of the cassette shell. This friction stops the spool from freely rotating.

REFERENCES:
patent: 4407579 (1983-10-01), Huff
patent: 4834306 (1989-05-01), Robertson et al.
patent: 4846418 (1989-06-01), Fairman
patent: 4930712 (1990-06-01), Smart
patent: 4938429 (1990-07-01), Robertson et al.
patent: 5031853 (1991-07-01), Jensen
patent: 5031855 (1991-07-01), Wolf et al.
patent: 5153627 (1992-10-01), Dwyer

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