Film cassette with interacting spool lock and light shield

Details Film cassette with interacting spool lock and light shield Film cassette with interacting spool lock and light shield

1993-06-16

1994-06-07

Gellner, Michael L.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 711, 242 718, G03B 1726

Patent

active

053194071

ABSTRACT:
A film cassette comprises a rotatable film spool, a light shield for preventing ambient light from entering the cassette interior, and a locking pawl movable into engagement with the spool to inhibit rotation of the spool but being forced out of engagement with the spool when the spool is rotated. According to the invention, the light shield is movable to open and the locking pawl is arranged to move the light shield to open responsive to the locking pawl being forced out of engagement with the spool when the spool is rotated.

REFERENCES:
patent: 2614763 (1952-10-01), Horton et al.
patent: 4221479 (1980-09-01), Harvey
patent: 5115268 (1992-05-01), Kitagawa et al.
patent: 5209419 (1993-05-01), Zander

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