35 mm Cassette with film rewind limit, exposure indicator, and f

Details 35 mm Cassette with film rewind limit, exposure indicator, and f 35 mm Cassette with film rewind limit, exposure indicator, and f

1981-03-03

1982-07-06

Griffin, Donald A.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 742, G03B 1726, B65H 7528

Patent

active

043380158

ABSTRACT:
A photographic film assemblage including a film cassette having an exit, a hollow film spool rotatably mounted within the cassette, and a strip of film coiled about the spool with a first end extending to the exterior of the cassette via the exit and a second end releasably attached to the spool. Mounted within the spool is a threaded shaft and nut assembly having a spool drive on one end thereof. The shaft is ordinarily fixed against rotation relative to the nut, and the latter is coupled to the spool by a spline-keyway combination such that rotation of the spool causes the nut to rotate on the shaft while simultaneously traversing its length. The forces of uncoiling the film during its exposure in a camera and its subsequent recoiling into the cassette are transferred to the nut via the spool to move it into a position wherein it locks the spool against further rotation in a direction which would enable the film to be completely uncoiled from the spool during its exposure; and into a disabling position in which it moves the spool drive out of driving engagement with the spool before the first end of the exposed film has been moved to the interior of the cassette. Prior to processing the film, the shaft is moved into a position in which the spool may continue to be rotated until the second end of the film becomes detached from the spool.

REFERENCES:
patent: 3136291 (1964-06-01), Irisawa et al.
patent: 3550877 (1970-12-01), Sutliff et al.
patent: 3602451 (1971-08-01), Dolby
patent: 3645467 (1972-02-01), Sato et al.
patent: 3978495 (1976-08-01), Warscheit
patent: 4014035 (1977-03-01), Canfield
patent: 4145133 (1979-03-01), Wareham
patent: 4212527 (1980-07-01), Fischer

Affiliated with

Also associated with

Rating

35 mm Cassette with film rewind limit, exposure indicator, and f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with 35 mm Cassette with film rewind limit, exposure indicator, and f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 35 mm Cassette with film rewind limit, exposure indicator, and f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2166444