US4222651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera film rewinding device
Assignee: Pentax Corp
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Filing: 1978-10-16
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Granted: 1980-09-16
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Expires: 1998-10-16
Abstract
Abstract A film rewinding device in a camera in which depression of a sprocket shaft causes a clutch mechanism between a winding mechanism and a sprocket to be disengaged. This action causes a locking member to lock the sprocket shaft, to maintain the sprocket in rewinding state. The film rewinding device comprises a winding button linked to the sprocket shaft and appearing in a recess formed in an outer housing member of said camera. A bearing member is provided for the rewinding button and has a groove in the upper surface thereof. Hence, depression of said rewinding button to the depth of the groove in said bearing member will cause the sprocket shaft to be depressed to the disengagement position of the clutch mechanism provided between the winding mechanism and the sprocket. This maintains the clutch mechanism in a disengagement state by means of the locking member thereby to permit the film to be rewound.
Inventors
- 👤 Fumio Urano
- 👤 Takumi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:55
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
207 words
In a film winding device in a camera having a sprocket shaft carrying a sprocket and a clutch mechanism disengaged from said sprocket by movement of said sprocket shaft and a locking member engaging said sprocket shaft to maintain the sprocket in a state for rewinding, the improvement comprising: a camera body having a recess formed therein, a depressable button disposed in said recess, said button operably coupled to said sprocket shaft, a bearing member positioned in said recess around said button and fixed to said camera body; wherein depression of said button in said bearing causes said sprocket shaft to be moved and disengage said clutch mechanism and permit the film to be rewound; means biasing said button to a position such that its outer surface is substantially flush with the outer surface of said bearing member; a groove in said bearing member, and wherein said button is depressed to the depth of said groove; and a locking member, said sprocket shaft having a section of reduced diameter to form an annular engagement surface whereby upon depression of said button said sprocket shaft is depressed and said locking member engages said annular surface to thereby maintain said clutch member in a disengaged position from said sprocket.
Claim 2
Dependent Claim
207 words
In a film winding device in a camera having a sprocket shaft carrying a sprocket and a clutch mechanism disengaged from said sprocket by movement of said sprocket shaft and a locking member engaging said sprocket shaft to maintain the sprocket in a state for rewinding, the improvement comprising: a camera body having a recess formed therein, a depressable button disposed in said recess, said button operably coupled to said sprocket shaft, a bearing member positioned in said recess around said button and fixed to said camera body; wherein depression of said button in said bearing causes said sprocket shaft to be moved and disengage said clutch mechanism and permit the film to be rewound; means biasing said button to a position such that its outer surface is substantially flush with the outer surface of said bearing member; a groove in said bearing member, and wherein said button is depressed to the depth of said groove; and a locking member, said sprocket shaft having a section of reduced diameter to form an annular engagement surface whereby upon depression of said button said sprocket shaft is depressed and said locking member engages said annular surface to thereby maintain said clutch member in a disengaged position from said sprocket.
Claim 3
Dependent Claim
23 words
The system of claim 1 wherein said bearing member further includes flange means forming a seal between said camera body and said button.
Claim 4
Dependent Claim
157 words
In a film winding device in a camera having a sprocket shaft carrying a sprocket and a clutch mechanism disengaged from said sprocket by movement of said sprocket and a locking member engaging said sprocket shaft to maintain the sprocket in a state for rewinding, the improvement comprising; a camera body having a recess formed therein, a depressable button disposed in said recess, said button operably coupled to said sprocket shaft, a bearing member positioned in said recess around said button and fixed to said camera body; wherein depression of said button in said bearing causes said sprocket shaft to be moved and disengage said clutch mechanism and permit the film to be rewound; means biasing said button to a position such that its outer surface is substantially flush with the outer surface of said bearing member; and wherein said biasing means biases said button in a direction inwardly relative to said camera body and said recess.
Claim 5
Dependent Claim
157 words
In a film winding device in a camera having a sprocket shaft carrying a sprocket and a clutch mechanism disengaged from said sprocket by movement of said sprocket and a locking member engaging said sprocket shaft to maintain the sprocket in a state for rewinding, the improvement comprising; a camera body having a recess formed therein, a depressable button disposed in said recess, said button operably coupled to said sprocket shaft, a bearing member positioned in said recess around said button and fixed to said camera body; wherein depression of said button in said bearing causes said sprocket shaft to be moved and disengage said clutch mechanism and permit the film to be rewound; means biasing said button to a position such that its outer surface is substantially flush with the outer surface of said bearing member; and wherein said biasing means biases said button in a direction inwardly relative to said camera body and said recess.
Claim 6
Dependent Claim
24 words
The system of claim 3 further comprising a groove in said bearing member and said button is depressed to the depth of said groove.
Claim 7
Independent Claim
33 words
The system of claims 3 or 4 further comprising a receiving member in contact with said sprocket shaft, said biasing means comprising a spring disposed between said receiving member and said bearing member.
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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |