Patent US4239362A successfully refreshed from Google Patents.
US4239362A
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Camera film advancing apparatus
Assignee: Nikon Corp
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Filing: 1979-05-10
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Granted: 1980-12-16
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Expires: 1999-05-10
Abstract
Abstract A camera film advancing apparatus is disclosed which is improved in respect of reliability of engagement between the pawl of the film advancing sprocket and the perforation of the film to simplify the operation necessary for film charging.
Inventors
- 👤 Akira Katayama
- 👤 Toshiaki Hozumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:52
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/56; G03B1/18; G03B1/20; G03B1/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
In a film advancing apparatus for a camera, comprising a film take-up spool for taking up the film thereon, the spool being formed at its periphery with a plurality of longitudinal slots; a sprocket for advancing the film to the take-up spool; first and second film guide members disposed between the sprocket and the take-up spool and opposed to each other, wherein a leading portion of the film advanced by the sprocket is led to the take-up spool through a space formed between the first and second film guide members so that the leading portion is caught in one of the slots to be taken up by the take-up spool, the improvement comprising: means defining recess on the periphery of said take-up spool between adjacent slots; the first film guide member being disposed to guide the leading portion of the film advanced by the sprocket to the space formed between the first and second guide members; and an end of the second film guide member being disposed for movement into one of the recesses of the take-up spool.
Claim 2
Dependent Claim
178 words
In a film advancing apparatus for a camera, comprising a film take-up spool for taking up the film thereon, the spool being formed at its periphery with a plurality of longitudinal slots; a sprocket for advancing the film to the take-up spool; first and second film guide members disposed between the sprocket and the take-up spool and opposed to each other, wherein a leading portion of the film advanced by the sprocket is led to the take-up spool through a space formed between the first and second film guide members so that the leading portion is caught in one of the slots to be taken up by the take-up spool, the improvement comprising: means defining recess on the periphery of said take-up spool between adjacent slots; the first film guide member being disposed to guide the leading portion of the film advanced by the sprocket to the space formed between the first and second guide members; and an end of the second film guide member being disposed for movement into one of the recesses of the take-up spool.
Claim 3
Dependent Claim
67 words
Film advancing apparatus according to claim 1, wherein said second film guide member is arranged to cooperate with a camera back lid, whereby when the lid is opened an end of the second film guide member moves into said one of the recesses of the film take-up spool and when the lid is closed the end of the second film guide member is retracted from the recess.
Claim 4
Dependent Claim
33 words
Film advancing apparatus according to claim 1, wherein said end of the second film guide member successively enters recesses of the film take-up spool opposed thereto during rotation of the film take-up spool.
References Cited (Backward Citations)
US2733062A
Cited
US1298393A
Cited
US3075427A
Cited
US3465657A
Cited
US3384319A
Cited
US4034388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |