Film takeup spool for camera
US4402468A · kind A · utility
3Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1981 |
| Grant date | Sep 6, 1983 |
| Priority date | — |
| Expiry date | Jun 30, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/261
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film takeup spool provided with pawls in the interior of a sleeve hub thereof at such a location that pivot pins of the pawls are off-set from the axis of rotation of the sleeve hub. The pawls are urged by respective springs to project their teeth radially outwardly of the sleeve hub into the perforations of the film. When the spool is driven to rotate with a sufficient tension of the film, the pawl teeth are retracted into the sleeve hub, thus permitting a smooth winding up of the film on the sleeve hub of the takeup spool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.