Film cassette

Details Film cassette Film cassette

1988-05-19

1989-05-23

Levy, Stuart S.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

354275, G03B 1726

Patent

active

048322750

ABSTRACT:
A film cassette is disclosed wherein a film spool is rotatable about an axis within the cassette shell, successive sections of the outermost convolution of a film roll wound on the film spool are automatically advanced to the outside of the cassette shell in response to rotation of the film spool, and a pair of rigid constraining rings radially confine the outermost convolution to prevent the film roll from clock-springing against an interior wall of the cassette shell. The constraining rings are supported along the interior wall for rotation about separate axes inclined with respect to the spool axis to position the rings to partially encircle the outermost convolution, to radially confine the outermost convolution, and to position relatively small opposite corresponding portions of the rings apart a distance greater than the width of the outermost convolution, to allow successive sections of the outermost convolution to exit the radial confinement of the rings when the film spool is rotated.

REFERENCES:
patent: 988341 (1911-04-01), Hill
patent: 2541476 (1951-02-01), Mihalyi
patent: 3234024 (1966-02-01), Leinonen
patent: 3659799 (1972-05-01), Cerutti et al.
patent: 3677499 (1972-07-01), Wangerin
patent: 3797777 (1974-03-01), Hosono et al.
patent: 4311377 (1982-01-01), Matteson
patent: 4407579 (1983-10-01), Huff
patent: 4423943 (1984-01-01), Gold

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