US3687039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-exposure device for photographic cameras
Assignee: Nikon Corp
•
Filing: 1970-10-06
•
Granted: 1972-08-29
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Expires: 1990-10-06
Abstract
Abstract A camera having a shutter release button, a film and shutter winding lever and a self-cocking mechanism including a shaft rotatable for charging a shutter, a gear train for advancing a film, a clutch for coupling and decoupling the shaft and gear train, the clutch having a pawl rotatably mounted on the shaft, a cam fixed to the gear train, a pawl being biased against the cam, the pawl and cam being formed to rotate the gear in unison with the shaft in the film advancing direction, the pawl being retractable from the cam to maintain the gear train at rest during rotation of the shaft for multi-exposure operation.
Inventors
- 👤 Koichi Furuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/28; G03B17/30; G03B17/305; G03B17/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
A camera having a shutter release button, a film and shutter winding lever and a self-cocking mechanism, comprising: a shaft rotatable for charging a shutter; gear means for advancing a film; clutch means for coupling and decoupling said shaft and said gear means; said clutch means including a pawl rotatably mounted on said shaft; a cam fixed to said gear means; biasing means for biasing said pawl onto said cam; said pawl and said cam being formed to rotate said gear in unison with said shaft in the film advancing direction; and means operably provided from outside of the camera for optionally retracting said pawl from said cam, against the biasing force of said biasing means, to maintain said gear means at rest during the rotation of said shaft.
Claim 2
Dependent Claim
129 words
A camera having a shutter release button, a film and shutter winding lever and a self-cocking mechanism, comprising: a shaft rotatable for charging a shutter; gear means for advancing a film; clutch means for coupling and decoupling said shaft and said gear means; said clutch means including a pawl rotatably mounted on said shaft; a cam fixed to said gear means; biasing means for biasing said pawl onto said cam; said pawl and said cam being formed to rotate said gear in unison with said shaft in the film advancing direction; and means operably provided from outside of the camera for optionally retracting said pawl from said cam, against the biasing force of said biasing means, to maintain said gear means at rest during the rotation of said shaft.
Claim 3
Dependent Claim
35 words
A camera according to claim 1, wherein said pawl retracting means includes a cam plate coaxially rotatable with respect to said cam and having a cam surface engageable with said pawl for retracting said pawl.
Claim 4
Dependent Claim
53 words
A camera accordIng to claim 2, further comprising a manually operable means coupled to said cam plate by gearing and movable between a first position in which said clutch means is actuated for coupling said shutter charging shaft with said gear means and a second position in which said clutch means is disengaged.
Claim 5
Dependent Claim
30 words
A camera according to claim 3, wherein said manually operable means includes a knob and a connecting member rotatable therewith, said knob being provided coaxially with the shutter release button.
References Cited (Backward Citations)
US2304887A
Cited
US3009406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |