Patent US3683778A successfully refreshed from Google Patents.
US3683778A
Expired / Lapsed
US
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Photographic shutter
Assignee: Individual
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Filing: 1970-05-13
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Granted: 1972-08-15
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Expires: 1990-05-13
Abstract
Abstract A photographic shutter having one set of blades, pivoted for fanwise movement on a common pivot, for opening the exposure aperture, and a second set of blades, also pivoted for fanwise movement, for closing the exposure aperture. Each set of blades is operated by its own operating lever, and both operating levers are driven by the same driving element which, in turn, is driven by a main driving member or master member.
Inventors
- 👤 Hugo Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:58
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
337 words
A photographic shutter comprising a structure having a light aperture, two separate blade systems each having a plurality of blades movable relative to each other in fanwise arrangement, the blades of each system being mounted so that they may be spread fanwise relative to each other to close said aperture and may be collapsed relative to each other to a non-obstructing position relative to said aperture, a main driving member, a driving element driven by said main driving member, and intermediate means operatively interposed between said driving element and said two blade systems for operating one of said blade systems during an earlier part of an operating movement of said element and for operating the other of said blade systems during a later part of an operating movement of said element, characterized by the features that: a. said intermediate means comprises two levers, one for each blade system, b. each lever is pivotally mounted near one end, c. each lever has near its other end a first entraining means in engagement with operating means in the respective blades of its associated blade system, d. each lever Has at an intermediate point a second entraining means in engagement with operating means in said driving element, e. the respective blades of one blade system being substantially duplicates of the respective blades of the other blade system but arranged reversely with respect thereto, and f. said driving element moves symmetrically from a first extreme position through a central position to a second extreme position during one exposure cycle and in the opposite direction from the second extreme position through the central position to the first extreme position during the next exposure cycle, g. the two blade systems alternating their functions during successive exposures, so that the blade system which constitutes the opening blades of a first exposure serves as the closing blades of the next succeeding exposure and the blade system which constitutes the closing blades of the first exposure serves as the opening blades of the next succeeding exposure.
Claim 2
Dependent Claim
337 words
A photographic shutter comprising a structure having a light aperture, two separate blade systems each having a plurality of blades movable relative to each other in fanwise arrangement, the blades of each system being mounted so that they may be spread fanwise relative to each other to close said aperture and may be collapsed relative to each other to a non-obstructing position relative to said aperture, a main driving member, a driving element driven by said main driving member, and intermediate means operatively interposed between said driving element and said two blade systems for operating one of said blade systems during an earlier part of an operating movement of said element and for operating the other of said blade systems during a later part of an operating movement of said element, characterized by the features that: a. said intermediate means comprises two levers, one for each blade system, b. each lever is pivotally mounted near one end, c. each lever has near its other end a first entraining means in engagement with operating means in the respective blades of its associated blade system, d. each lever Has at an intermediate point a second entraining means in engagement with operating means in said driving element, e. the respective blades of one blade system being substantially duplicates of the respective blades of the other blade system but arranged reversely with respect thereto, and f. said driving element moves symmetrically from a first extreme position through a central position to a second extreme position during one exposure cycle and in the opposite direction from the second extreme position through the central position to the first extreme position during the next exposure cycle, g. the two blade systems alternating their functions during successive exposures, so that the blade system which constitutes the opening blades of a first exposure serves as the closing blades of the next succeeding exposure and the blade system which constitutes the closing blades of the first exposure serves as the opening blades of the next succeeding exposure.
Claim 3
Dependent Claim
43 words
A shutter as defined in claim 1, further characterized by the features that the main driving member (26) is in the form of a crank and has a crank pin (26a) which engages in a driving slot (22b) in said driving element (22).
Claim 4
Dependent Claim
39 words
A shutter as defined in claim 1, further characterized by the features that said light aperture (10a) is substantially circular, and that said driving element is in the form of a ring (22) mounted for rotation around said aperture.
Claim 5
Dependent Claim
98 words
A shutter as defined in claim 1, further characterized by the features that each blade system comprises three shutter blades mounted for pivotal movement about a common bearing pin (12), and that one of the blades (14a and 16a) of each system has an opening and closing edge (14aa and 16aa) and the other blades of the same system serve as protecting blades (14b, 14c, and 16b, 16c) covering that part of the light aperture which is not covered by the blade which has the opening and closing edge, when the respective blade system is in aperture-closing position.
Claim 6
Dependent Claim
178 words
A shutter as defined in claim 1, wherein the operating means in said driving element is in the form of a first and a second slot, each slot having a dwell portion and a cam-rise portion, said portions being so arranged that during an early part of a single operating movement of said driving element in one direction from one limit position to another limit position, the cam rise portion of a first slot will operate said intermediate means to open the previously closed blades of a first blade system while the dwell portion of the other slot will control said intermediate means to maintain the blades of the other blade system in open condition, and during a later part of said single operating movement of said driving element, the dwell portion of said first slot will control said intermediate means to maintain the blades of said first blade system in open condition while the cam rise portion of the other slot will operate said intermediate means to close the previously open blades of the other blade system.
Claim 7
Dependent Claim
151 words
A shutter as defined in claim 1, wherein said main driving member is a rotary member turning always in the same direction and rotating through one-half of a revolution during each exposure cycle, and wherein during a first exposure cycle the half revolution of said main driving member moves said driving element in one direction from a first limit position to a second limit position to cause said driving element to open the blades of a first previously closed blade system and to close the blades of a second previously open blade system, and during the next exposure cycle the half revolution of said main driving member moves said driving element in an opposite direction from its said second limit position to its said first limit position to cause said driving element to open the blades of said second blade system and to close the blades of said first blade system.
Claim 8
Dependent Claim
56 words
A shutter as defined in claim 5, wherein said first entraining means on each lever is a control pin; said operatinG means in the respective blades are slots with which the respective control pins are engaged; and said second entraining means on each lever is an operating pin engaging the coordinated slot in said driving element.
References Cited (Backward Citations)
US3479946A
Cited
US3580156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |