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 Title: |
US5479223:
Film conversion sprocket
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
McLendon, Donald C.; Houston, TX
Lipscomb, Robert D.; Santa Rosa, CA
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| 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
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| Application Number: |
US1995000434607
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| IPC Code: |
Advanced:
G03B 1/24;
Core:
G03B 1/18;
IPC-7:
G03B 1/00;
G03B 1/24;
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| ECLA Code: |
G03B1/24;
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| U.S. Class: |
Current:
352/079;
226/076;
352/168;
Original:
352/079;
352/168;
226/076;
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| Field of Search: |
352/079,80,129,168,187
226/076
242/209
403/326,359
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| Priority Number: |
| 1995-05-04 |
US1995000434607 |
| 1993-01-29 |
US1993000011657 |
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| 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.
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| Attorney, Agent or Firm: |
Conley, Rose & Tayon ;
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| Primary / Asst. Examiners: |
Gellner, Michael L.; Lee, Eddie C.
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| Parent Case: |
This is a continuation application of U.S. patent application Ser. No. 08/011,657 filed Jan. 29, 1993, now abandoned.
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| Family: |
None
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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.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
Show drawing descriptions
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| Description: |
Show description
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| Forward References: |
Show 1 U.S. patent(s) that reference this one
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| Foreign References: |
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Publication |
Date |
IPC Code |
Assignee |
Title |
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FR0360329
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1906-04 |
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| Other Abstract Info: |
DERABS G96-057928
DERG96-057928
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| 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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