Patent US4078953A successfully refreshed from Google Patents.
Patent US3645182A successfully refreshed from Google Patents.
US3645182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film windup device for cameras
Assignee: Nikon Corp
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Filing: 1969-10-14
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Granted: 1972-02-29
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Expires: 1989-10-14
Abstract
Abstract With a film windup device of this invention, rotary motion of sprocket or sprocket shaft is transmitted to spool by way of clutch mechanism; shutter windup system is separated from sprocket and spool by using the rewind mechanism to allow the shutter to be wound alone; shutter is separated in the case of rewinding by rewind mechanism; only the sprocket can be rotated backward by the action of the aforementioned clutch without transmitting the backward rotation to the spool.
Inventors
- 👤 Shuji Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:00
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
339 words
A photographic roll film camera mechanism for a camera having an operating handle for simultaneous tensioning of a shutter and winding of a film strip, said mechanism comprising, in combination, a sprocket roller for feeding the filmstrip; a film spool for winding the fed filmstrip; means for tensioning the shutter; a windup shaft coupled to the operating handle by a ratchet mechanism and guided through said film spool; a first gear train for transmitting the rotation of said windup shaft to the shutter-tensioning means, including a driving gear carried by lower end of said windup shaft and having a plurality of protrusions on its one surface and an intermediate gear provided coaxially to said sprocket roller; a sprocket shaft guided through and slidably fitting with said intermediate gear and said sprocket roller, said sprocket shaft being connected with said sprocket roller by means of a pinand-slot connection and having a step section depressed at its lower end, said intermediate gear being provided between said sprocket roller and said step section; clutch means for freeing said sprocket roller from said sprocket shaft, said clutch means being provided between said intermediate gear and said sprocket roller; a spring inserted into said sprocket roller; a button provided on the lower end of said sprocket shaft and depressible against said spring for actuating said sprocketfreeing clutch means; a pivotable lever mounted on the camera body, one end of said pivotable lever normally engaging with the outer periphery of said step section and entering the inner periphery of said step section for holding said sprocket shaft in the depressed position thereof while said sprocket freeing clutch means is actuated, the other end of said lever being engageable with said protrusion of said driving gear for releasing said sprocket shaft from said one end of said pivotable lever when the operating handle is rotated, and a second gear train provided between the upper end of said sprocket shaft and said film spool for rotating said film spool in accordance with that of said sprocket roller.
Claim 2
Dependent Claim
339 words
A photographic roll film camera mechanism for a camera having an operating handle for simultaneous tensioning of a shutter and winding of a film strip, said mechanism comprising, in combination, a sprocket roller for feeding the filmstrip; a film spool for winding the fed filmstrip; means for tensioning the shutter; a windup shaft coupled to the operating handle by a ratchet mechanism and guided through said film spool; a first gear train for transmitting the rotation of said windup shaft to the shutter-tensioning means, including a driving gear carried by lower end of said windup shaft and having a plurality of protrusions on its one surface and an intermediate gear provided coaxially to said sprocket roller; a sprocket shaft guided through and slidably fitting with said intermediate gear and said sprocket roller, said sprocket shaft being connected with said sprocket roller by means of a pinand-slot connection and having a step section depressed at its lower end, said intermediate gear being provided between said sprocket roller and said step section; clutch means for freeing said sprocket roller from said sprocket shaft, said clutch means being provided between said intermediate gear and said sprocket roller; a spring inserted into said sprocket roller; a button provided on the lower end of said sprocket shaft and depressible against said spring for actuating said sprocketfreeing clutch means; a pivotable lever mounted on the camera body, one end of said pivotable lever normally engaging with the outer periphery of said step section and entering the inner periphery of said step section for holding said sprocket shaft in the depressed position thereof while said sprocket freeing clutch means is actuated, the other end of said lever being engageable with said protrusion of said driving gear for releasing said sprocket shaft from said one end of said pivotable lever when the operating handle is rotated, and a second gear train provided between the upper end of said sprocket shaft and said film spool for rotating said film spool in accordance with that of said sprocket roller.
Claim 3
Dependent Claim
90 words
A photographic roll film camera mechanism according to claim 1, wherein said sprocket-freeing clutch means includes a hub projected from said intermediate gear toward said sprocket roller, a pin fixed on said sprocket shaft and a groove on said hub being engageable with said pin and opened at the upper end of said hub, thereby when said button is depressed, said pin is disengaged to said groove, and when said sprocket shaft is released from said pivotable lever, said pin is slidably contacted with the upper surface of said hub.
Claim 4
Dependent Claim
59 words
A photographic roll film camera mechanism according to claim 2, further comprising a freewheeling clutch spring provided between said sprocket roller and the first gear member of said second gear train supported by upper end of said sprocket shaft to free said sprocket roller from said second gear train when said button is depressed and the film is rewound.
Claim 5
Dependent Claim
124 words
A photographic roll film camera mechanism according to claim 2, further comprising an additional clutch mechanism provided between said sprocket roller and said second gear train and including a driving member slidable on said sprocket shaft and rotatable therewith by means of pin-and-slot connection, a pair of sawtooth formations on the side surfaces of said driving member and the first gear member of said second gear train, respectively, and a spring urging said driving member to said first gear member, thereby when said sprocket roller is rotated with said sprocket shaft in forward direction for film winding, said pair of sawtooth formations are meshed to each other and when said sprocket roller is reversed for film rewinding, said pair of sawtooth formations are disengaged.
Claim 6
Dependent Claim
63 words
A photographic roll film camera mechanism according to claim 2, further comprising an additional clutch mechanism provided between said sprocket shaft and saId second gear train and including a driving member fixed on the upper end of said sprocket shaft, thereby when said button is depressed, said clutch mechanism is actuated so as to free said sprocket shaft from said second gear train.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |