US3628434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focal-plane shutter for photographic camera
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1969-05-02
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Granted: 1971-12-21
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Expires: 1989-05-02
Abstract
Abstract The leading and the lagging shutter blade of a focal-plane shutter are both provided with a racklike row of teeth at the outer edges of each blade and extending in parallel to the direction of shutter-blade movement. The blades move in the direction of the short side of the image aperture in the imageaperture plate, and toothed segments are arranged in the camera between the cone of light, travelling from the camera lens to the film through the image aperture and the adjacent partition walls of the camera housing; the segments being permanently in mesh with the racks of the blades and being used either for driving the shutter blades after shutter release and for returning them to their starting position or only for the latter purpose.
Inventors
- 👤 Ludwig Leitz
- 👤 Willy Franke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:38
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/36; G03B9/40; G03B9/42
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
242 words
A focal-plane shutter for photographic cameras comprising, in combination, a leading shutter blade and a lagging shutter blade, each said shutter blade consisting of a main lamella and a plurality of auxiliary lamellae, said lamellae being displaceable in the direction of one side of the image aperture in the imageaperture plate, each said main lamella having a racklike row of teeth along an edge thereof, the row of teeth on the leading main lamella extending parallel to one edge of the image-aperture plate and the row of teeth on the lagging main lamella extending parallel to the opposite edge of said aperture, a first toothed segment mounted on an inner camera wall adjacent the row of teeth of the leading main lamella and a second toothed segment mounted on an inner camera wall adjacent the row of teeth of the lagging main lamella, the teeth of said segments permanently meshing with said racklike row of teeth on the associated lamella, means adapted to pivot said segments, one after the other, in a preestablished temporal relationship, said means adapted to pivot comprising two spring-driven rocking cranks, each said crank being connected to one of said toothed segments by means of a connection rod, tabs on said main lamellae adapted to drive said auxiliary lamellae in an abutting engagement after said main lamellae have travelled through a preestablished distance, and means adapted to return said segments and said shutter blades to their initial position.
Claim 2
Dependent Claim
242 words
A focal-plane shutter for photographic cameras comprising, in combination, a leading shutter blade and a lagging shutter blade, each said shutter blade consisting of a main lamella and a plurality of auxiliary lamellae, said lamellae being displaceable in the direction of one side of the image aperture in the imageaperture plate, each said main lamella having a racklike row of teeth along an edge thereof, the row of teeth on the leading main lamella extending parallel to one edge of the image-aperture plate and the row of teeth on the lagging main lamella extending parallel to the opposite edge of said aperture, a first toothed segment mounted on an inner camera wall adjacent the row of teeth of the leading main lamella and a second toothed segment mounted on an inner camera wall adjacent the row of teeth of the lagging main lamella, the teeth of said segments permanently meshing with said racklike row of teeth on the associated lamella, means adapted to pivot said segments, one after the other, in a preestablished temporal relationship, said means adapted to pivot comprising two spring-driven rocking cranks, each said crank being connected to one of said toothed segments by means of a connection rod, tabs on said main lamellae adapted to drive said auxiliary lamellae in an abutting engagement after said main lamellae have travelled through a preestablished distance, and means adapted to return said segments and said shutter blades to their initial position.
Claim 3
Dependent Claim
30 words
A focal-plane shutter for photographic cameras as claimed in claim 1, wherein said racklike row of teeth is a perforation row cut out along one edge of said main lamellae.
Claim 4
Dependent Claim
54 words
A focal-plane shutter for photographic cameras as claimed in claim 1 and further comprising spring means adapted to drive said auxiliary lamellae immediately after shutter release and to support driving of said auxiliary lamellae by said main lamella after abutment of said tabs of said main lamella against said tabs of said auxiliary lamellae.
Claim 5
Dependent Claim
25 words
A focal-plane shutter for photographic cameras as claimed in claim 3, wherein said spring means are helical springs which are supported by said guide bars.
Claim 6
Dependent Claim
36 words
A focal-plane shutter for photographic cameras as claimed in claim 1, wherein said cranks comprise abutting means adapted to limit said rocking motion and to establish an abutting engagement between said cranks during the shutter-tensioning motion.
Claim 7
Dependent Claim
46 words
A focal-plane shutter for photographic cameras as claimed in claim 1, and further comprising locking means on said crank which drives the toothed segment associated to the lagging shutter blade, said locking means being adapted to be engaged by a pawl operated by a time-setting mechanism.
Claim 8
Dependent Claim
94 words
A focal-plane shutter for photographic cameras as claimed in claim 1, including guide means mounted adjacent said image-aperture plate for guiding said lamellae during movement, said guide means comprising two guide bars, one of said guide bars extending parallel to one edge of said aperture in said image-aperture plate, the other of said guide bars extending parallel to the opposite edge of said aperture in said image-aperture plate, one of said guide bars guiding the lamellae of said leading shutter blade, the other said guide bar guiding the lamellae of said lagging shutter blade.
Claim 9
Dependent Claim
80 words
A focal-plane shutter for photographic cameras as claimed in claim 1, including guide means mounted on the image-aperture plate for guiding said lamellae during movement, said guide means comprising first and second guide bars extending in parallel, said first guide bar located on said image-aperture plate and guiding the lamellae of said leading shutter blade, said second guide bar locAted on the opposite side of the aperture in said image-aperture plate and guiding the lamellae of said lagging shutter blade.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |