Photographic film cassette and lens-fitted photographic film uni

Details Photographic film cassette and lens-fitted photographic film uni Photographic film cassette and lens-fitted photographic film uni

1993-08-31

1995-04-18

Gray, David M.

G03B 1726

Patent

active

054082889

ABSTRACT:
A lens-fitted photographic film unit has a film supply chamber preloaded with unexposed photographic film. A cassette-containing chamber contains a film cassette. The film after exposure is wound on a spool of the cassette. The film unit is provided with a mechanism for exposing the film in a succession of frames. An axial hole is formed in an upper end of the spool. Knurled inner teeth are formed inside the axial hole. A wind-up wheel is mounted on the film unit over the cassette-containing chamber to be externally operable for rotation. A drive shaft on the wind-up wheel protrudes into the cassette-containing chamber, and is received in the axial hole. Knurled outer teeth about the drive shaft mesh with the inner teeth on the spool. The drive shaft and spool will thus mesh with each other in any relatively rotated position thereof, which avoids loss of usable film.

REFERENCES:
patent: 1967061 (1934-07-01), Muros
patent: 5247325 (1993-09-01), Takahashi

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