Patent US4142789A successfully refreshed from Google Patents.
US4142789A
Expired / Lapsed
US
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Charging mechanism of a camera shutter
Assignee: Seiko Koki KK
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Filing: 1976-12-16
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Granted: 1979-03-06
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Expires: 1996-12-16
Abstract
Abstract A camera shutter mechanism including an actuating lever for actuating the mechanism, a biasing spring biasing the actuating lever to operate, and a hook lever for releasably holding the actuating lever against the action of the biasing spring. The actuating lever includes a pin extending outwardly therefrom, and a resilient cylindrical bushing loosely fitting around the pin, with the pin positioned so that the spring bears against the bushing to push the bushing against the pin. The pin is positioned so that structure for returning the actuating lever from a rest position to a cocked position pushes against the bushing when returning the actuating lever.
Inventors
- 👤 Mitsuo Koyama
- 👤 Tadashi Nakagawa
- 👤 Masanori Watanabe
- 👤 Ichiro Nemoto
- 👤 Eiichi Onda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:25
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/66; G03B9/08; G03B9/10; G03B9/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
In a camera shutter mechanism: an actuating lever mounted to pivot between a cocked position and rest position for actuating the camera shutter mechanism; a spring having a first fixed portion and a second portion engaging said actuating lever for biasing said actuating lever from the cocked position to the rest position; means for releasably holding said actuating lever in the cocked position and for releasing said actuating lever to pivot from the cocked position to the rest position; and means for returning said actuating lever from the rest position to the cocked position; wherein said actuating lever includes a pin extending outwardly therefrom, and a resilient cylindrical bushing loosely fitting around said pin, with said pin positioned so that said spring bears against said bushing to push said bushing against said pin, and said pin positioned so that said means for returning pushes against said bushing when returning said actuating lever from the rest position to the cocked position.
Claim 2
Dependent Claim
160 words
In a camera shutter mechanism: an actuating lever mounted to pivot between a cocked position and rest position for actuating the camera shutter mechanism; a spring having a first fixed portion and a second portion engaging said actuating lever for biasing said actuating lever from the cocked position to the rest position; means for releasably holding said actuating lever in the cocked position and for releasing said actuating lever to pivot from the cocked position to the rest position; and means for returning said actuating lever from the rest position to the cocked position; wherein said actuating lever includes a pin extending outwardly therefrom, and a resilient cylindrical bushing loosely fitting around said pin, with said pin positioned so that said spring bears against said bushing to push said bushing against said pin, and said pin positioned so that said means for returning pushes against said bushing when returning said actuating lever from the rest position to the cocked position.
Claim 3
Dependent Claim
131 words
In a camera shutter mechanism according to claim 1: wherein said actuating lever is a closing member of the camera shutter mechanism effective to terminate exposure upon pivoting from the cocked position to the rest position; the camera shutter mechanism further including an opening member having a cocked position and a rest position and effective to initiate exposure when displaced from the cocked position to the rest position, and a driving member operable for driving said opening member from the cocked position to the rest position, said means for returning comprising said driving member positioned for engaging said bushing mounted on said actuating lever to pivot said actuating lever from the rest position to the cocked position as said driving member is displaced from the rest position to the cocked position.
Claim 4
Dependent Claim
75 words
In a camera shutter mechanism according to claim 1: wherein said actuating lever is an opening member of the camera shutter mechanism effective to initiate exposure upon pivoting from the cocked position to the rest position; and said means for returning is comprised of a lever mounted to pivot and positioned to pivot and engage said actuating lever when the same is in the rest position and return said actuating lever to the cocked position.
Claim 5
Dependent Claim
70 words
In a camera shutter mechanism according to claim 1: wherein said means for releasably holding includes a lever mounted to pivot for positioning an end thereof adjacent and away from said actuating lever, and means for engaging said actuating lever at said end of said lever when said end is adjacent said actuating lever and for disengaging said actuating lever when said end is displaced away from said actuating lever.
Claim 6
Dependent Claim
83 words
In a camera shutter mechanism according to claim 1: a fixed pin; and a pin mounted on said actuating lever; and wherein said spring includes a central portion under compression, an end portion comprising said first fixed portion bearing against said fixed pin, and a second end portion bearing against said pin mounted on said actuating lever and maintaining said central portion of said spring under compression so that said spring biases said actuating lever from the cocked position toward the rest position.
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) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |