US3661339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film rewinding mechanism for cameras
Assignee: Nikon Corp
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Filing: 1970-03-17
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Granted: 1972-05-09
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Expires: 1990-03-17
Abstract
Abstract A film rewinding mechanism for underwater cameras comprises a rewinding shaft adapted to engage film rewind gearing for film rewinding and to disengage from the gearing during film advancement. The shaft is provided with two coaxial gears having areas formed without teeth. During film advancement, the areas without teeth are in alignment to disengage the shaft from the rewind gearing; and during rewinding, the areas without teeth are out of alignment to form a continuous toothed gear in engagement with the rewind gearing.
Inventors
- 👤 Terushige Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:46
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/02; G03B17/08; G03B17/28; G03B17/30; G03B17/305; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19614; Y10T74/1987; Y10T74/19874
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
225 words
In a camera having a housing and a film supply spool rotatably mounted therein; an improved film rewinding device which comprises: an operation member rotatably mounted in said housing; a shaft rotatable within said housing and engaging said supply spool to cause rotation thereof; and means for selectively coupling said operation member and said shaft, said coupling means including a gear train interconnected to said shaft, a first wheel fixed to said operation member having a toothed portion engageable with said gear train, and a toothless portion, a second wheel arranged coaxially with and rotatable relative to said first wheel and having a toothed portion engageable with said gear train and a toothless portion, and means for limiting the relative rotation between said wheels to selectively locate said wheels at a disconnecting position in which both the toothless portions are opposed to said gear train, and at a connecting position in which at least one of said toothed portions is opposed to and in engagement with said gear train whereby upon rotation of said film spool in film advancement said toothless portions are opposed to said gear train to disconnect said operation member therefrom and upon rotation of said operation member in film rewinding direction, at least one of said toothed portions engages said gear train to operatively connect said operation member to said shaft.
Claim 2
Dependent Claim
225 words
In a camera having a housing and a film supply spool rotatably mounted therein; an improved film rewinding device which comprises: an operation member rotatably mounted in said housing; a shaft rotatable within said housing and engaging said supply spool to cause rotation thereof; and means for selectively coupling said operation member and said shaft, said coupling means including a gear train interconnected to said shaft, a first wheel fixed to said operation member having a toothed portion engageable with said gear train, and a toothless portion, a second wheel arranged coaxially with and rotatable relative to said first wheel and having a toothed portion engageable with said gear train and a toothless portion, and means for limiting the relative rotation between said wheels to selectively locate said wheels at a disconnecting position in which both the toothless portions are opposed to said gear train, and at a connecting position in which at least one of said toothed portions is opposed to and in engagement with said gear train whereby upon rotation of said film spool in film advancement said toothless portions are opposed to said gear train to disconnect said operation member therefrom and upon rotation of said operation member in film rewinding direction, at least one of said toothed portions engages said gear train to operatively connect said operation member to said shaft.
Claim 3
Dependent Claim
34 words
A film rewinding device according to claim 1, wherein said limitation means comprises a pin provided on said first wheel and a limited slot provided on said second wheel adapted to receive said pin.
Claim 4
Dependent Claim
82 words
A film rewinding device according to claim 1, wherein said gear train comprises a toothed wheel fixed to said shaft and an intermediate toothed wheel mounted to said camera housing for rocking movement and engageable with said wheel and said first and second wheels, and the film rewinding device further comprises a stopper for controlling the engaging position of said intermediate wheel relative to said first and second wheels, and an biasing member for urging said intermediate wheel to its engaging position.
Claim 5
Dependent Claim
21 words
A film rewinding device according to claim 1, wherein said operating member extends outside of said camera housing for manual operation.
Claim 6
Dependent Claim
43 words
A film rewinding device according to claim 4, which further comprises a shield member mounted between said operating member and said camera housing for preventing a fluid from entering said camera housing by close contact action of the deformation of the shield member.
References Cited (Backward Citations)
GB237441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |