Apparatus for facilitating engagement between film and film actuated pull-strip
US4027956A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1976 |
| Grant date | Jun 7, 1977 |
| Priority date | — |
| Expiry date | Aug 12, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/265
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus for facilitating the achievement of locking engagement between the film strip contained in a film cassette of the type in which the film may be exposed, processed and projected without removal from the cassette, and a pull-strip for removing a tear-tab closure initially sealing a supply of processing fluid within the cassette. The supply end of the film strip contains a bottle-shaped aperture through which a tapered latching tongue provided at the free end of the pull-strip passes upon initiation of rewind after exposure. The supply reel hub is provided with a latching tongue receiving surface lying below the film receiving surface of the hub which, upon continued advancement of the film strip, receives and supports the latching tongue to fold it back upon itself. The bottle-shaped aperture in the film strip includes a first section through which the tapered latching tongue initially passes and a locking section communicating with the first section by a narrow passageway defined by a pair of inwardly extending tabs. The passageway defined by the inwardly extending tabs is narrower than the tapered latching tongue and the tabs are caused to deflect downwardly into the regi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.