Patent US4766452A successfully refreshed from Google Patents.
US4766452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission changeover mechanism for camera
Assignee: Canon Inc
•
Filing: 1986-07-23
•
Granted: 1988-08-23
•
Expires: 2006-07-23
Abstract
Abstract A changeover mechanism in the transmission of rotation of a drive source such as a reversible motor to an operating mechanism for the camera comprises a planetary clutch and is provided with a planetary changeover limiting member pivotally mounted on a common shaft of a planetary gear of the planetary clutch and frictionally connected thereto, whereby when the motor rotates in such a direction that the planetary gear engages a gear which is drivingly connected to the operating mechanism, release of the planetary gear from the engagement is inhibited, and when in the reverse direction, the planetary gear is permitted to disengage from the gear of the mechanism.
Inventors
- 👤 Tsunemasa Ohara
- 👤 Masayuki Suzuki
- 👤 Yoichi Tosaka
- 👤 Masaharu Kawamura
- 👤 Yoshihito Harada
- 👤 Ryuichi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:36
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
264 words
A transmission changeover mechanism for a camera comprising: (a) a transmission system for transmitting rotation of a motion generating wheel to a transmission gear of an operating mechanism of the camera; (b) a planetary clutch arranged in said transmission system, said planetary clutch comprising a sun gear and at least one planetary gear, said sun gear meshing with a gear on the motion generating wheel side, and said planetary gear being changeable between a meshing and non-meshing engagement with said transmission gear; and (c) a limiting member for limiting the revolving movement of said planetary gear of said planetary clutch, said limiting member inhibiting the revolving movement of said planetary gear in the meshing release direction in response to the meshing position of said planetary gear in the rotation in the meshing direction with said transmission gear, and said limiting member releasing the inhibition of said revolving movement in response to the rotation of said planetary gear in the non-meshing direction, wherein said operating mechanism of the camera causes by way of operation production of an event wherein the transmission of force is directed in the following sequence: said transmission gear → said planetary gear → said sun gear, and wherein said operating mechanism of the camera includes a cam which rotates as said transmission gear rotates, and a lever whose swinging is controlled by said cam, a cam displacement of said cam being set such that the transmission of force is transmitted in the following sequence: said transmission gear → said planetary gear → said sun gear occurs on the way of operation.
Claim 2
Dependent Claim
264 words
A transmission changeover mechanism for a camera comprising: (a) a transmission system for transmitting rotation of a motion generating wheel to a transmission gear of an operating mechanism of the camera; (b) a planetary clutch arranged in said transmission system, said planetary clutch comprising a sun gear and at least one planetary gear, said sun gear meshing with a gear on the motion generating wheel side, and said planetary gear being changeable between a meshing and non-meshing engagement with said transmission gear; and (c) a limiting member for limiting the revolving movement of said planetary gear of said planetary clutch, said limiting member inhibiting the revolving movement of said planetary gear in the meshing release direction in response to the meshing position of said planetary gear in the rotation in the meshing direction with said transmission gear, and said limiting member releasing the inhibition of said revolving movement in response to the rotation of said planetary gear in the non-meshing direction, wherein said operating mechanism of the camera causes by way of operation production of an event wherein the transmission of force is directed in the following sequence: said transmission gear → said planetary gear → said sun gear, and wherein said operating mechanism of the camera includes a cam which rotates as said transmission gear rotates, and a lever whose swinging is controlled by said cam, a cam displacement of said cam being set such that the transmission of force is transmitted in the following sequence: said transmission gear → said planetary gear → said sun gear occurs on the way of operation.
Claim 3
Dependent Claim
188 words
A transmission changeover mechanism for a camera comprising: (a) a transmission system for transmitting rotation of a motion generating wheel to a transmission gear of an operating mechanism of the camera; (b) a planetary clutch arranged in said transmission system, said planetary clutch comprising a sun gear and at least one planetary gear, said sun gear meshing with a gear on a motion generating wheel side, and said planetary gear being changeable between a meshing and non-meshing engagement with said transmission gear; and (c) a limiting member for limiting the revolving movement of said planetary gear of said planetary clutch, said limiting member being rotatably mounted on the common shaft of said planetary gear, being frictionally connected thereto, and having formed therein an engagement portion such that in the meshing position of said planetary gear in the rotation of the meshing direction with said transmission gear, it is positioned in a movement hindering position of the meshing release direction of said planetary gear, whereas, in the rotation of the non-meshing direction of said planetary gear, it is swung by said friction to retract from said movement hindering position.
Claim 4
Dependent Claim
188 words
A transmission changeover mechanism for a camera comprising: (a) a transmission system for transmitting rotation of a motion generating wheel to a transmission gear of an operating mechanism of the camera; (b) a planetary clutch arranged in said transmission system, said planetary clutch comprising a sun gear and at least one planetary gear, said sun gear meshing with a gear on a motion generating wheel side, and said planetary gear being changeable between a meshing and non-meshing engagement with said transmission gear; and (c) a limiting member for limiting the revolving movement of said planetary gear of said planetary clutch, said limiting member being rotatably mounted on the common shaft of said planetary gear, being frictionally connected thereto, and having formed therein an engagement portion such that in the meshing position of said planetary gear in the rotation of the meshing direction with said transmission gear, it is positioned in a movement hindering position of the meshing release direction of said planetary gear, whereas, in the rotation of the non-meshing direction of said planetary gear, it is swung by said friction to retract from said movement hindering position.
Claim 5
Dependent Claim
44 words
A camera according to claim 2, wherein said operating mechanism of the camera causes by way of operation production of an event wherein the transmission of force is directed in the following sequence: said transmission gear → said planetary gear → said sun gear.
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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |