Patent US2139240A successfully refreshed from Google Patents.
Patent US3774518A successfully refreshed from Google Patents.
US3774518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large diameter photographic shutter
Assignee: Individual
•
Filing: 1972-02-09
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Granted: 1973-11-27
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Expires: 1992-02-09
Abstract
Abstract A photographic shutter having a large aperture (about 2 1/2 inches) that can be driven at relatively high speed by an electromechanical actuator. The shutter has two blades of very thin sheet material that are reciprocated in opposition to each other in translation only. The blades have integrally formed flanges that stiffen them and provide the strength needed to keep them from buckling. The actuator is connected to the blades through relatively long levers to achieve the desired length of travel with adequate allowance for the rotational output motion of the actuator.
Inventors
- 👤 A Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:34
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/14; G03B9/58
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
225 words
A photographic shutter of the kind having a pair of blades reciprocatable in translation and in mutual opposition between a first position in which the shutter is closed and a second position in which the shutter is open, said shutter comprising: a. a pair of blades of a thin, flexible sheet material, each of said blades including an integral flange extending along one edge thereof for rigidifying it, b. a mounting plate having an aperture, c. a retainer plate having an aperture about the same size as the aperture in said mounting plate, d. means securing said retainer plate to said mounting plate closely spaced and parallel thereto with the apertures of said plates in register with each other, e. said blades lying free and in face to face contact with each other between said mounting plate and said retainer plate with their flanges extending along one edge of said retainer plate, f. a retainer bar adjacent to said flanges and on the opposite side thereof from said retainer plate for retaining said flanges within a predetermined distance from the edge of said retainer plate, and g. drive means for reciprocating said blades in opposition to each other, h. said retainer bar, together with said retainer plate being the sole guide means for said blades in directions parallel to the plane of said mounting plate.
Claim 2
Dependent Claim
225 words
A photographic shutter of the kind having a pair of blades reciprocatable in translation and in mutual opposition between a first position in which the shutter is closed and a second position in which the shutter is open, said shutter comprising: a. a pair of blades of a thin, flexible sheet material, each of said blades including an integral flange extending along one edge thereof for rigidifying it, b. a mounting plate having an aperture, c. a retainer plate having an aperture about the same size as the aperture in said mounting plate, d. means securing said retainer plate to said mounting plate closely spaced and parallel thereto with the apertures of said plates in register with each other, e. said blades lying free and in face to face contact with each other between said mounting plate and said retainer plate with their flanges extending along one edge of said retainer plate, f. a retainer bar adjacent to said flanges and on the opposite side thereof from said retainer plate for retaining said flanges within a predetermined distance from the edge of said retainer plate, and g. drive means for reciprocating said blades in opposition to each other, h. said retainer bar, together with said retainer plate being the sole guide means for said blades in directions parallel to the plane of said mounting plate.
Claim 3
Dependent Claim
41 words
A shutter according to claim 1 wherein each of said blades is shaped to define a notch of generally ogive shape, the edges of said notches being arranged to move across said aperture during travel of the blades between said positions.
Claim 4
Dependent Claim
14 words
A shutter according to claim 1 wherein said drive means comprises an electromagnetic actuator.
Claim 5
Dependent Claim
53 words
A shutter according to claim 3 wherein said actuator includes output levers that move in rotation only, structural beams are cantilevered on said levers, and connecting rods are pivotted bEtween the distal ends of said beams and respective ones of said blades for driving the blades responsively to motion of said output levers.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |