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Title: US5479223: Film conversion sprocket
[ Derwent Title ]

Country: US United States of America

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9 pages

Inventor: McLendon, Donald C.; Houston, TX
Lipscomb, Robert D.; Santa Rosa, CA

Assignee: Duo-Sprocket, Inc., Houston, TX
other patents from DUO-SPROCKET, INC. (717134) (approx. 1)
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Published / Filed: 1995-12-26 / 1995-05-04

Application Number: US1995000434607

IPC Code: Advanced: G03B 1/24;
Core: G03B 1/18;
IPC-7: G03B 1/00;
G03B 1/24;

ECLA Code: G03B1/24;

U.S. Class: Current: 352/079; 226/076; 352/168;
Original: 352/079; 352/168; 226/076;

Field of Search: 352/079,80,129,168,187 226/076 242/209 403/326,359

Priority Number:
1995-05-04  US1995000434607
1993-01-29  US1993000011657

Abstract: A sprocket assembly is provided which allows a film projector or any other film handling device to be readily converted to run film having different perforation-to-frame ratios. The sprocket assembly includes an outer cylindrical sleeve having teeth for engaging the film perforations when the film is run, and an inner cylindrical sleeve adapted to fit within and anti-rotationally mate with the outer cylindrical sleeve. The inner sleeve also has teeth for engaging the film perforations. The inner sleeve is mounted on a rotatable shaft of the projector, and the outer sleeve can be added or removed.

Attorney, Agent or Firm: Conley, Rose & Tayon ;

Primary / Asst. Examiners: Gellner, Michael L.; Lee, Eddie C.

INPADOC Legal Status: Show legal status actions

Related Applications:
Application Number Filed Patent Pub. Date  Title
US1993000011657 1993-01-29       

Parent Case:     This is a continuation application of U.S. patent application Ser. No. 08/011,657 filed Jan. 29, 1993, now abandoned.

Family: None

First Claim:
Show all 11 claims
We claim:     1. A sprocket assembly for converting a film projector or other film-handling device having at least one rotatable shaft for pulling film having evenly spaced perforations therein, comprising:
  • a first cylindrical sleeve having a central bore and a central cylindrical portion and opposed cylindrical end portions having evenly spaced first sprocket teeth thereon for engaging the perforations, said first sprocket teeth forming arcuate surfaces therebetween;
  • an aperture extending through said central cylindrical portion;
  • a connecting member disposed in said aperture and engageable against the rotatable shaft;
  • a second cylindrical sleeve insertable over said first cylindrical sleeve and having evenly spaced second sprocket teeth thereon to engage the perforations, said second sleeve including a through central bore having at least one spline disposed therein, said spline having side walls engaging the sides of two adjacent first sprocket teeth on said first sleeve between the root and crown of said teeth, and the other sides of said first sprocket teeth being disengaged from the second sleeve and said spline having an arcuate base extending between said side walls for matingly engaging said arcuate surface between said adjacent first sprocket teeth for providing an anti-rotational engagement therebetween; and
  • interlocking members extending through bores in said one spline and engaging said opposed cylindrical end portions.

Background / Summary: Show background / summary

Drawing Descriptions: Show drawing descriptions

Description: Show description

Forward References: Show 1 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (1)   |   Backward references (10)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 3pp US1229275  1917-06 Jenkins   MOTION-PICTURE APPARATUS.
Get PDF - 4pp US1956391* 1934-04 Kuppenbender et al.    
Get PDF - 5pp US1972555* 1934-09 Fear    
Get PDF - 3pp US2376714  1945-05 Mussen   Windshield cleaner
Get PDF - 3pp US3179450* 1965-04 Recker    
Get PDF - 5pp US3507569  1970-04 Goto   MOTION PICTURE FILM EDITOR OR VIEWER
Get PDF - 6pp US3865738  1975-02 Lente   METHOD OF MAKING MOTION PICTURES
Get PDF - 5pp US4437782  1984-03 Geisthoff  Jean Walterscheid GmbH Splined hub assembly for connecting two shafts
Get PDF - 18pp US4639163  1987-01 Buthe et al.  Jean Walterscheid GmbH Driveline coupling with safety interlock mechanism
Get PDF - 9pp US4900293  1990-02 McLendon   4:3 perf conversion sprocket
  * some details unavailable
Foreign References:
Publication Date IPC Code Assignee   Title
Buy PDF FR0360329 1906-04  B26F 1/00 LOUIS HENRI HUET Système de réparation et d'utilisation des vieilles bandes de cinématographe 

Other Abstract Info: DERABS G96-057928 DERG96-057928

Other References:
  • "Three-perforation at Clarimont," American Cinematographer, Dec. 1988.
  • "Trilent 35 System," Image Technology, Jul. 1988.
  • "Kodak's Coleman on HDTV and the Future of Film," International Photographer, Oct. 1988, pp. 16-19.
  • "Study Group on 30 Frame Film Rate," International Photographer, Dec. 1988, at p. 20.
  • "Television--Merging Multiple Technologies", presented at The 24th Annual SMPTE Television Conference, Jan. 26-27, 1990, Disney Contemporary Resort, Lake Buena Vista, Fla.
  • "35 mm--The Next 100 Years--3 or 4 PERF, 24 or 30 FPS--An Available Solution For The Dilemma," presented at The 24th Annual SMPTE Television Conference, Jan. 26-27, 1990, Disney Contemporary Resort, Lake Buena Vista, Fla.

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