Photographic film cassette

Details Photographic film cassette Photographic film cassette

1992-01-28

1993-05-18

Jillions, John M.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

354275, G03B 1726

Patent

active

052113485

ABSTRACT:
A photographic film cassette has a photographic film leader, which is advanced outwardly from a cassette shell when a spool is rotated. The spool has two flanges, of which a first one is loosely fitted on a core of the spool. A circumferential lip projects from an inside surface of the first flange toward a photographic filmstrip, contacts on a lateral side of a roll of the filmstrip, and prevents the roll from loosening. The first flange together with the lip is formed according to thermoforming from a sheet of thermoplastic resin having a melt index of 4 or less so as to have a high intensity, and has a thickness of 0.4 mm or less so as to be deformable with a small force.

REFERENCES:
patent: 4834306 (1989-05-01), Robertson et al.
patent: 4848693 (1989-07-01), Robertson
patent: 4938429 (1990-07-01), Robertson et al.
patent: 4962401 (1990-10-01), Takahashi
patent: 5083721 (1992-01-01), Okutsu et al.

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