Photographic film cassette

Details Photographic film cassette Photographic film cassette

1992-03-13

1994-01-11

Jillions, John M.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

G03B 104

Patent

active

052773760

ABSTRACT:
A photographic film cassette contains photographic film, of which a leader is separated from a roll of film while the spool rotates under a condition of clamping the roll between two spool flanges, and is thereby caused to advance outside a cassette shell. A circumferential lip projects from around a first flange toward the roll, and is in contact with one lateral edge of an outermost turn of the roll. A passage ridge is formed on the lower surface of a film passageway, supports one lateral edge of the film during passage through the passageway after being flexed transversely by the lip, and prevents the film edge from contact with the lower surface. The first passage ridge is formed to satisfy the following conditions, and prevents the film from being worn down by a rub while advanced outward:

REFERENCES:
patent: 4407579 (1983-10-01), Huff
patent: 4834306 (1989-05-01), Robertson et al.
patent: 4883235 (1989-11-01), Niedospial, Jr.
patent: 4883236 (1989-11-01), Niedospial, Jr. et al.
patent: 4887776 (1989-12-01), Niedospial, Jr. et al.
patent: 5031852 (1991-07-01), Dowling et al.
patent: 5040739 (1991-08-01), Wolf et al.
patent: 5046681 (1991-09-01), Niedospial
patent: 5046682 (1991-09-01), Niedospial
patent: 5102062 (1992-04-01), Bush

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