Patent US3871012A successfully refreshed from Google Patents.
US3871012A
Expired / Lapsed
US
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Reboundless focal plane shutter
Assignee: Pentax Corp
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Filing: 1973-08-14
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Granted: 1975-03-11
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Expires: 1993-08-14
Abstract
Abstract A reboundless focal plane shutter includes leading and trailing sets of shutter blades successively moveable between charged and discharged positions. Each set of shutter blades is provided with a damping mechanism including a recessed click pin and leading and trailing contact pins on opposite sides of the click pin and having tapered end faces, the pins being located on the shutter blade of maximum movement. A spring loaded ball detent is located in the path of movement of the pins and is in registering engagement with the recess when the click pin is in the shutter discharge position, the shutter movement and rebound being slowed as each pin engages the detent.
Inventors
- 👤 Keisuke Haraguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:13
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A camera shutter comprising a metal blade type shutter member moveable between a charged and discharged position and a damping means including a click member moveable with said shutter member and having a recess in a face thereof and a detent member located in the path of said click member and resiliently urged into releasable engagement with said recess when said shutter member is in its discharged position to rEleasably retain said click member in the shutter discharged position, but permitting the movement thereof along said path to opposite sides of said detent member.
Claim 2
Dependent Claim
94 words
A camera shutter comprising a metal blade type shutter member moveable between a charged and discharged position and a damping means including a click member moveable with said shutter member and having a recess in a face thereof and a detent member located in the path of said click member and resiliently urged into releasable engagement with said recess when said shutter member is in its discharged position to rEleasably retain said click member in the shutter discharged position, but permitting the movement thereof along said path to opposite sides of said detent member.
Claim 3
Dependent Claim
94 words
A camera shutter comprising a metal blade type shutter member moveable between a charged and discharged position and a damping means including a click member moveable with said shutter member and having a recess in a face thereof and a detent member located in the path of said click member and resiliently urged into releasable engagement with said recess when said shutter member is in its discharged position to rEleasably retain said click member in the shutter discharged position, but permitting the movement thereof along said path to opposite sides of said detent member.
Claim 4
Dependent Claim
94 words
A camera shutter comprising a metal blade type shutter member moveable between a charged and discharged position and a damping means including a click member moveable with said shutter member and having a recess in a face thereof and a detent member located in the path of said click member and resiliently urged into releasable engagement with said recess when said shutter member is in its discharged position to rEleasably retain said click member in the shutter discharged position, but permitting the movement thereof along said path to opposite sides of said detent member.
Claim 5
Dependent Claim
42 words
The camera shutter of claim 1 including a pair of contact members moveable with said click member and spaced from and located along opposite sides of said click member proximate the path thereof and moveable into separable engagement with said detent member.
Claim 6
Dependent Claim
62 words
The camera shutter of claim 2 including a cylinder having a bore in axial alignment with said recess when said shutter is in its discharged position, said detent member comprising a ball registering with said bore, and a compression spring housed in said bore and bearing on said ball to resiliently urge it to a position projecting from, but engaging said bore.
Claim 7
Dependent Claim
15 words
The camera shutter of claim 3 incuding means for adjusting the compression of said spring.
Claim 8
Dependent Claim
18 words
The camera shutter of claim 3 wherein said contact members comprise outwardly directed pins having bevelled outer corners.
Claim 9
Dependent Claim
43 words
The camera shutter of claim 5 wherein said click member comprises an outwardly directed pin between said contact pins and has a bevelled outer edge, said recess being of circular configuration and being formed in the outer end face of said click pin.
Claim 10
Dependent Claim
36 words
The camera shutter of claim 1 where said shutter member comprises successively releasable leading and trailing shutter members, said damping means comprises first and second damping mechanisms respectively being associated with each of said shutter members.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |