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US3645186A Expired / Lapsed US ⏱️ 0.0 years remaining

Shutter opening and closing mechanism

Assignee: Individual
•
Filing: 1969-12-08
•
Granted: 1972-02-29
•
Expires: 1989-12-08
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Abstract

Abstract A camera shutter mechanism comprises a pivotally mounted shutter-operating member which is oscillatable to open and close the lens aperture of the camera. A driving member rotatably mounted on the operating member and spring biased to rotate in one direction has a plurality of arms. A release lever is engageable with one of the arms to hold the driving member in set position when the driving member is released, it is rotated by the spring and one arm acts against an abutment on one side of the axis of the driving member as a fulcrum to moving the operating member in a direction to open the shutter. For longer exposures, the driving member is held in shutter-open position by an electromagnetic magnet controlled by a timing circuit. Upon release by the electromagnet, the driving member rotates further in the same direction but fulcrums about an abutment engaging an arm on the opposite side of the axis of the driving member so that the operating member is pivoted in the opposite direction to close the shutter. Setting means engages an arm of the driving member to cock it while the operating member remains in shutterclosed position.

Inventors

  • 👤 Kiyoshi Kitai

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 06:03
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 163 words
In a shutter mechanism, the combination of a shutter blade movable between an open position and a closed position, an operating member for moving said blade between open and closed positions, a driving member rotatably mounted on said operating member and having a plurality of arms, means for rotating said driving member relative to said operating member, a release member engageable with an arm of said driving member to hold it releasably in a set position, retaining means releasably holding an arm of said driving member to provide a first fulcrum about which said driving member turns to move said operating member in shutter-opening direction upon release of said driving member by said release member to rotate in an operating direction, and abutment means engageable by an arm of said driving member to provide a second fulcrum about which said driving member turns to move said operating member in a shutter-closing direction upon further rotation of said driving member in said operating direction.
Claim 2
Dependent Claim 163 words
In a shutter mechanism, the combination of a shutter blade movable between an open position and a closed position, an operating member for moving said blade between open and closed positions, a driving member rotatably mounted on said operating member and having a plurality of arms, means for rotating said driving member relative to said operating member, a release member engageable with an arm of said driving member to hold it releasably in a set position, retaining means releasably holding an arm of said driving member to provide a first fulcrum about which said driving member turns to move said operating member in shutter-opening direction upon release of said driving member by said release member to rotate in an operating direction, and abutment means engageable by an arm of said driving member to provide a second fulcrum about which said driving member turns to move said operating member in a shutter-closing direction upon further rotation of said driving member in said operating direction.
Claim 3
Dependent Claim 28 words
A shutter-operating mechanism according to claim 1, in which said means for rotating said driving member comprises spring means acting between said driving member and said operating member.
Claim 4
Dependent Claim 15 words
A shutter-operating mechanism according to claim 1, in which said retaining means comprises an electromagnet.
Claim 5
Dependent Claim 27 words
A shutter-operating mechanism according to claim 3, in which an electronic timing circuit controls said electromagnet to release said driving member after a selected interval of time.
Claim 6
Dependent Claim 18 words
A shutter-operating mechanism according to claim 4, in which said timing circuit comprises a capacitor and a photoresistor.
Claim 7
Dependent Claim 45 words
A shutter-operating mechanism according to claim 2, further comprising setting means engageable with an arm of said driving member to move it to said set position while exerting through said spring means on said operating member a force holding said operating member in shutter-closed position.
Claim 8
Dependent Claim 15 words
A shutter-operating mechanism according to claim 6, in which said driving member has three arms.

References Cited (Backward Citations)

US2571756A Cited
US3476031A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-02-28 1975-08-30 1976-02-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-02-28 1979-08-30 1980-02-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-02-28 1983-08-30 1984-02-29 $7700.00 Window Closed / Lapsed

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