Patent US3886572A successfully refreshed from Google Patents.
US3886572A
Expired / Lapsed
US
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Shutter assembly having means for sequentially braking and stopping shutter blades
Assignee: Seiko Koki KK
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Filing: 1973-08-27
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Granted: 1975-05-27
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Expires: 1993-08-27
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. A flexible spring plate has an arcuate braking portion disposed along the path of travel of the shutter blades for frictionally engaging therewith and braking the high speed motion of the shutter blades and the spring plate has a stopping portion disposed directly in the path of travel of the shutter blades for abutting therewith and positively stopping the shutter blades at a predetermined stop position.
Inventors
- 👤 Eiichi Onda
- 👤 Mitsuo Koyama
- 👤 Tadashi Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:21
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
211 words
A shutter assembly for a camera comprising: means defining a shutter aperture; a plurality of actuatable shutter blades comprising a first group of shutter-opening shutter blades actuatable through a working stroke 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 shutter blades actuatable through a working stroke from a retracted position wherein they open said shutter aperture to an extended position wherein they close said shutter aperture; shutter actuating means for sequentially actuating the first and second shutter blade groups to effect first opening and then closing of said shutter aperture thereby defining an exposure; and combined braking-stopping means separate and distinct from said shutter actuating means and having a frictional braking portion and a subsequently effective stopping portion both disposed along the path of travel of the same end portions of the shutter blades within at least one of said first and sEcond shutter blade groups for sequentially braking the motion of said shutter blades by said frictional braking portion as they near completion of their working stroke and effecting precise stoppage of said shutter blades directly by said stopping portion at a predetermined stop position at the end of their working stroke.
Claim 2
Dependent Claim
211 words
A shutter assembly for a camera comprising: means defining a shutter aperture; a plurality of actuatable shutter blades comprising a first group of shutter-opening shutter blades actuatable through a working stroke 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 shutter blades actuatable through a working stroke from a retracted position wherein they open said shutter aperture to an extended position wherein they close said shutter aperture; shutter actuating means for sequentially actuating the first and second shutter blade groups to effect first opening and then closing of said shutter aperture thereby defining an exposure; and combined braking-stopping means separate and distinct from said shutter actuating means and having a frictional braking portion and a subsequently effective stopping portion both disposed along the path of travel of the same end portions of the shutter blades within at least one of said first and sEcond shutter blade groups for sequentially braking the motion of said shutter blades by said frictional braking portion as they near completion of their working stroke and effecting precise stoppage of said shutter blades directly by said stopping portion at a predetermined stop position at the end of their working stroke.
Claim 3
Dependent Claim
82 words
A shutter assembly according to claim 1; wherein said braking-stopping means comprises a single resiliently flexible member having said braking portion extending into said path of travel of said shutter blades and slidably engageable with said shutter blades to frictionally brake the motion of said shutter blades as they near completion of their working stroke and having a stopping portion extending directly across said path of travel to abut with said shutter blades and positively stop them at said predetermined stop position.
Claim 4
Dependent Claim
52 words
A shutter assembly according to claim 2; wherein said braking portion of said flexible member comprises an arcuate bowed portion thereof bowed inwardly across said path of travel of said shutter blades to apply a progressively increasing braking force to said shutter blades as they move through completion of their working stroke.
Claim 5
Dependent Claim
55 words
A shutter assembly according to claim 3; wherein said stopping portion of said flexible member comprises a bent portion thereof connected to the end of said bowed portion and extending directly into and completely blocking said path of travel of said shutter blades for engaging therewith and positively stopping them at said predetermined stop position.
Claim 6
Dependent Claim
46 words
A shutter assembly according to claim 2; wherein said stopping portion of said flexible member comprises a bent portion thereof extending directly into and completely blocking said path of travel of said shutter blades for engaging therewith and positively stopping them at said predetermined stop position.
Claim 7
Dependent Claim
16 words
A shutter assembly according to claim 2; wherein said flexible member comprises a flexible spring plate.
Claim 8
Dependent Claim
31 words
A shutter assembly according to claim 2; including combined braking-stopping means disposed along the path of travel of the shutter blades within each of said first and second shutter blade groups.
References Cited (Backward Citations)
US2418644A
Cited
US2975689A
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US3391627A
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US3580156A
Cited
US3683778A
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US3628438A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |