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US 4,846,418 AGranted
Film cassette
AssigneeEastman Kodak Company
InventorPatricia D. Fairman
Life of this patent
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AssigneeEastman Kodak Company
InventorPatricia D. Fairman
Estimating the term…
In a 35 mm film cassette, the leading end of a film roll coiled about a film spool is located within the cassette shell. The film spool is comprised of two pieces constructed to telescopically receive one another. Each spool piece includes a radially extending flange normally disposed adjacent one of the opposite sides of the film roll. When the film spool is initially rotated in a film unwinding direction, a rotation-responsive cam device coupling the two spool pieces automatically moves one spool piece axially toward the other piece to cause the respective flanges to clamp the film roll at its opposite sides. As a result, the leading end of the film roll will be rotated past a stripper-guide which strips the leading end from between the flanges and guides it through a light-trapped opening in the cassette shell. Thus rotation of the film spool in the unwinding direction will advance the leading end to the outside of the film cassette.
An improved film cassette wherein (a) a cassette shell has a film passage opening, (b) a film spool is rotatable within said cassette shell in a film unwinding direction and has a pair of coaxially spaced radial flanges, (c) a convoluted film roll is coiled about said spool between said two flanges and has a leading end, (d) two parts of said spool are fixed to said respective flanges and at least one of said parts is movable axially toward the other part to move at least one of the flanges axially closer to the other flange and into a firm frictional relation with an outermost convolution of said film roll to thereby enable rotation of the spool in the unwinding direction to propel said leading end from said film passage opening, and wherein the improvement comprises:
Dependencies are inferred from the claim text.