Stationary sprocket guard assembly
US3958873A · kind A · utility
1Cited by
5References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 9, 1975 |
| Grant date | May 25, 1976 |
| Priority date | — |
| Expiry date | Jun 9, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B1/56
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A sprocket assembly for a motion picture projector and a method of threading and removing film from the sprocket assembly is disclosed. By selected configuration of the sprocket and the stationary sprocket guard, including aligner and keeper portions cooperating with the teeth of the sprocket, the film is inserted and removed by simply bending and lowering or twisting and lifting relative to the sprocket assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.