G - Physics
03
B
95/94.6
G03B 17/26 (2006.01) G03B 17/30 (2006.01)
Patent
CA 1298130
Abstract Film Cassette A film cassette (1) is disclosed wherein a spool (5) is rotatable within the cassette shell (3), a convoluted film roll (37) is wound on the spool, and a pair of flanges (51 & 53) are rotatable with the spool. The flanges (51 & 53) have respective disks (55 & 57) overlying opposite sides (63 & 65) of the film roll (37) and respective annular lips (59 & 61) circumferentially extending from the disks to radially confine an outermost convolution (47) of the film roll to prevent the outermost convolution from clock-springing against an interior wall (73) of the cassette shell (3). Each of the annular lips (59 & 61) includes an annular constraining section (71) positioned relatively remote from one of the disks (55 & 57) and a predetermined radial distance (R1) from the spool (5) to enable a lip to contact the outermost convolution (47) of the film roll (373 at a limited location remote from a disk, to radially confine the outermost convolution, and it includes an annular relief section (75) extending from the disk to the constraining section (71) and positioned a predetermined radial distance (R2) from the spool, greater than the first-mentioned distance (R1), to enable a lip to avoid contacting the outermost convolution substantially between the disk and the constraining section. This arrangement provides an essentially radial contact between the annular lips (59 & 61) and the outermost convolution (47), thereby preventing any clock-springing of the film roll (37) from generating an axial force against the flange (51 & 53) of the spool (5).
599467
Robertson Jeffrey Charles
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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