Optics: motion pictures – With plural picture sizes and types – Plural film width
Patent
1995-03-20
1996-05-14
Gellner, Michael L.
Optics: motion pictures
With plural picture sizes and types
Plural film width
352168, 352187, G03B 4100, G03B 124
Patent
active
055172628
ABSTRACT:
A changeable sprocket wheel assembly enables the rapid and reliable mounting and demounting of sprocket wheels of different diameters on a film drive shaft by unskilled operators, while assuring that the sprockets are held with high precision. In one arrangement, an inboard sprocket wheel member (50, FIG. 2) receives the inboard portion (55) of a driven shaft in a close sliding fit and is lockable to the shaft, the inboard member having a small diameter land (52) with a ring of sprockets (54) thereon. An outboard sprocket wheel member (60) has the same size land with sprockets thereon, and fits around the outboard shaft portion (65) in a close sliding fit and is detachably fixable to the inboard member to abut it and rotate with it. When a larger diameter sprocket wheel is required, the outboard member (60) is removed and a large sprocket wheel element (70, FIG. 3) is mounted in its place, the large element having two large lands (72, 74) that each have a ring of sprockets (76, 78) thereon, with the large element lying in close sliding fit with the outer shaft portion and being detachably fixable to the inboard member. In another assembly (160, FIG. 10), an inner member (162) receives the drive shaft in a close sliding fit and is rotatably fixed to it, while sprocket wheel members (180, 196) of different sizes each have cylindrical inner surfaces that are closely slidable on the inner member and are mounted to abut it and rotate with it. Detachable fixing of two members is accomplished by a projecting pin portion (100, FIG. 9) that is retained by a spring ring (102).
REFERENCES:
patent: 1854004 (1932-04-01), Tschopp
patent: 1972555 (1934-09-01), Fear
patent: 2146767 (1939-02-01), Ross
patent: 2315703 (1943-04-01), Hirschfeld
patent: 2493612 (1950-01-01), Blanchet
patent: 2834249 (1958-05-01), May
patent: 3447866 (1969-06-01), Heisler
patent: 3507569 (1970-04-01), Goto
patent: 4900293 (1990-02-01), McLendon
patent: 5312304 (1994-05-01), Vetter
Gellner Michael L.
Lee Eddie C.
LandOfFree
Motion picture drive system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Motion picture drive system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motion picture drive system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1899769