Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1989-01-12
1990-07-03
Hail, III, Joseph J.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
354275, G03B 1726
Patent
active
049384295
ABSTRACT:
A film cassette is disclosed wherein a pair of annular constraining flanges are coaxially spaced on a film spool. The flanges radially confine the outermost convolution of a film roll wound on the spool to prevent the film roll from clock-springing against the cassette shell and thereby hindering film movement. A pair of internal cam members are rotatable from outside of the cassette shell to open a light lock by slightly separating opposite throat portions of the shell. Another pair of internal cam members are rotated with the first pair to flex a limited section of the flanges apart an axial distance sufficient to radially free a corresponding section of the outermost convolution. Then, rotation of the film spool will cause successive sections of the flanges to be momentarily flexed apart, and each freed section of the outermost convolution will be advanced automatically to the outside of the cassette shell.
REFERENCES:
patent: 2552200 (1951-05-01), Mihalyi
patent: 2575024 (1951-11-01), Mihalyi
patent: 2731894 (1956-01-01), Leitz et al.
patent: 3104846 (1963-09-01), Ringle
patent: 3128058 (1964-04-01), Ringle et al.
patent: 3463409 (1969-08-01), Stark
patent: 4407579 (1983-10-01), Huff
patent: 4423943 (1984-01-01), Gold
Fraser Mark D.
Robertson Jeffrey C.
duBois Steven M.
Eastman Kodak Co.
Hail III Joseph J.
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