Photographic film cassette

Details Photographic film cassette Photographic film cassette

1991-11-26

1993-11-30

Stodola, Daniel P.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 718, 354275, G03B 1726

Patent

active

052658201

ABSTRACT:
A cassette shell consists of two shell halves, and rotatably contains a spool core on which a photographic film is wound. A pair of spool flanges are loosely fitted on the spool core. Rotation of the spool core causes a film leader to advance through a film passage slit. A melting point of resin for molding the spool flanges is different from that of resin for molding the cassette shell for the purpose of avoiding undesired ultrasonic welding on their contact surfaces when joining the shell halves. The spool flanges are molded from material including polyolefin resin having a high density and a high molecular weight in order to reduce friction against the cassette shell and the photographic film.

REFERENCES:
patent: 4524920 (1985-06-01), Kidawara
patent: 4616914 (1986-10-01), Buelens
patent: 4832275 (1989-05-01), Robertson
patent: 4834306 (1989-05-01), Robertson
patent: 4846418 (1989-07-01), Fairman
patent: 4883236 (1989-11-01), Niedospial
patent: 4887776 (1989-12-01), Niedospial
patent: 4889292 (1989-12-01), Loewe
patent: 5009372 (1991-08-01), Loewe
patent: 5049928 (1991-09-01), Tirone
patent: 5083720 (1992-01-01), Niedospial
patent: 5115268 (1992-05-01), Kitagawa

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