US3847476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter assembly having means for preventing rebounding of the shutter blades
Assignee: Seiko Koki KK
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Filing: 1973-08-23
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Granted: 1974-11-12
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Expires: 1993-08-23
Abstract
Abstract A shutter assembly has a plurality of shutter blades divided in a shutter-opening blade group and a shutter-closing blade group. A shutter actuating mechanism independently actuates both groups of shutter blades to effect opening and closing of a shutter aperture and the actuating mechanism comprises a first set of generally parallel actuating levers connected to the shutter blades of the shutter-opening blade group by means of a pin-andslot connection so that pivotal movement of the first set of actuating levers effects opening of the shutter aperture. A second set of generally parallel actuating levers is connected to the shutter blades of the shutter-closing blade group in a similar manner so that pivotal movement of the second set of actuating levers effects closing of the shutter aperture. One lever from each set of actuating levers has a flexible portion and a fixed projection is disposed along the path of travel of each of the flexible portions to make sliding engagement therewith. The relative positions of the fixed projections and the flexible portions are such that during movement of the shutter blades to effect either opening or closing of the shutter aperture, the corresponding flexible portion engages with and rides over one of the stationary projections causing momentary flexure of the flexible portion accompanied by momentary pressing of the shutter blades against a stationary plate to thereby absorb the kinetic energy of the shutter blades and effectively attenuate their rapid movement of the shutter blades.
Inventors
- 👤 E Onda
- 👤 M Koyama
- 👤 T Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:20
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
206 words
A shutter assembly for a camera comprising: means defining a shutter aperture; a plurality of actuatable shutter blades actuatable in sequence from one state wherein they close said shutter aperture to a second state wherein they open said shutter aperture and to a third state wherein they again close said shutter aperture thereby defining an exposure; shutter actuating means for sequentially actuating said plurality of shutter blades from one state to said second state and then to said third state; preventing means momentarily engageable with said shutter actuating means during movement of said shutter blades from one of said states to another and coacting with said shutter actuating means for sufficiently attenuating the motion of said shutter blades to prevent rebounding thereof after reaching their intended state, said preventing means comprising at least one fixed projection disposed along the path of travel of said shutter actuating means, and a flexible portion comprising part of said shutter actuating means and slideable over said fixed projection and frictionally engageable therewith to effect resilient flexure of said resilient portion to a degree sufficient to press the shutter blades in a direction for causing said blades to contact each other laterally and to arrest the motion of said shutter blades.
Claim 2
Dependent Claim
206 words
A shutter assembly for a camera comprising: means defining a shutter aperture; a plurality of actuatable shutter blades actuatable in sequence from one state wherein they close said shutter aperture to a second state wherein they open said shutter aperture and to a third state wherein they again close said shutter aperture thereby defining an exposure; shutter actuating means for sequentially actuating said plurality of shutter blades from one state to said second state and then to said third state; preventing means momentarily engageable with said shutter actuating means during movement of said shutter blades from one of said states to another and coacting with said shutter actuating means for sufficiently attenuating the motion of said shutter blades to prevent rebounding thereof after reaching their intended state, said preventing means comprising at least one fixed projection disposed along the path of travel of said shutter actuating means, and a flexible portion comprising part of said shutter actuating means and slideable over said fixed projection and frictionally engageable therewith to effect resilient flexure of said resilient portion to a degree sufficient to press the shutter blades in a direction for causing said blades to contact each other laterally and to arrest the motion of said shutter blades.
Claim 3
Dependent Claim
367 words
A shutter assembly for a camera comprising: means defining a shutter aperture; a plurality of actuatable shutter blades actuatable in sequence from one state wherein they close said shutter aperture to a second state wherein they open said shutter aperture and to a third state wherein they again close said shutter aperture thereby defining an exposure; shutter actuating means for sequentially actuating said plurality of shutter blades from said one state to said second state and then to said third state; preventing means momentarily engageable with said shutter actuating means during movement of said shutter blades from one of said states to another and coacting with said shutter actuating means for sufficiently attentuating the motion of said shutter blades to prevent rebounding thereof after reaching their intended state; said plurality of shutter blades comprising a first group of shutter-opening shutter blades actuatable from an extended position wherein they close said shutter aperture to a retractEd position wherein they open said shutter aperture, and a second group of shutter-closing blades actuatable from a retracted position wherein they open said shutter aperture to an extended position wherein they close said shutter aperture; said shutter actuating means comprising a first set of pivotal actuating levers coacting with said first group of shutter blades to effect actuation thereof from its extended state to its retracted state in response to pivotal movement of said first set of actuating levers, and a second set of pivotal actuating levers coacting with said second group of shutter blades to effect actuation thereof from its retracted state to its extended state in response to pivotal movement of said second set of actuating levers; and said preventing means comprising a flexible portion of one actuating lever in each of said sets, and fixed projections disposed along the path of travel of each flexible portion and slidingly engageable therewith during pivotal movement of the corresponding actuating lever to effect resilient flexure of each corresponding resilient portion to a degree sufficient to press the shutter blades in a direction for causing said blades to contact each other laterally and to sufficiently arrest the movement thereof to thereby prevent rebounding of the corresponding shutter blades upon reaching their intended position.
Claim 4
Dependent Claim
367 words
A shutter assembly for a camera comprising: means defining a shutter aperture; a plurality of actuatable shutter blades actuatable in sequence from one state wherein they close said shutter aperture to a second state wherein they open said shutter aperture and to a third state wherein they again close said shutter aperture thereby defining an exposure; shutter actuating means for sequentially actuating said plurality of shutter blades from said one state to said second state and then to said third state; preventing means momentarily engageable with said shutter actuating means during movement of said shutter blades from one of said states to another and coacting with said shutter actuating means for sufficiently attentuating the motion of said shutter blades to prevent rebounding thereof after reaching their intended state; said plurality of shutter blades comprising a first group of shutter-opening shutter blades actuatable from an extended position wherein they close said shutter aperture to a retractEd position wherein they open said shutter aperture, and a second group of shutter-closing blades actuatable from a retracted position wherein they open said shutter aperture to an extended position wherein they close said shutter aperture; said shutter actuating means comprising a first set of pivotal actuating levers coacting with said first group of shutter blades to effect actuation thereof from its extended state to its retracted state in response to pivotal movement of said first set of actuating levers, and a second set of pivotal actuating levers coacting with said second group of shutter blades to effect actuation thereof from its retracted state to its extended state in response to pivotal movement of said second set of actuating levers; and said preventing means comprising a flexible portion of one actuating lever in each of said sets, and fixed projections disposed along the path of travel of each flexible portion and slidingly engageable therewith during pivotal movement of the corresponding actuating lever to effect resilient flexure of each corresponding resilient portion to a degree sufficient to press the shutter blades in a direction for causing said blades to contact each other laterally and to sufficiently arrest the movement thereof to thereby prevent rebounding of the corresponding shutter blades upon reaching their intended position.
Claim 5
Dependent Claim
68 words
A shutter assembly according to claim 2, wherein each said flexible portion of a corresponding actuating lever includes a protuberance projecting outwardly toward said fixed projection and slideable thereover and cooperative therewith to arrest the motion of said one actuating lever during forward movement thereof and engageable therewith upon return movement of said one actuating lever to prevent rebounding of said corresponding shutter blades from their intended position.
Claim 6
Dependent Claim
62 words
A shutter assembly according to claim 2, including a base plate having mounted thereon said shutter blades and said shutter actuating means; and wherein said fixed projection is dimensioned to effect resilient flexure of said flexible portion to a degree sufficient to press said corresponding shutter blades against said base plate to thereby further attentuate the movement of said one actuating lever.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |