Patent US4188097A successfully refreshed from Google Patents.
Patent US3920198A successfully refreshed from Google Patents.
US3920198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film cartridge
Assignee: Eastman Kodak Co
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Filing: 1974-04-30
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Granted: 1975-11-18
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Expires: 1994-04-30
Abstract
Abstract A film cartridge loaded with a roll of motion picture film having a magnetic stripe on one surface of the film tends to clockspring in a radial direction and undergo displacement of some convolutions of the film in a direction parallel to the axis of the film roll, especially when subjected to shaking or impacts during handling of the cartridge prior to use in a camera. When this occurs, friction between a displaced convolution and the adjacent convolutions of the film effectively prevents return of the stepped convolution to its original position. Subsequently, when film is to be pulled from the supply roll during operation of a camera or similar device in which the cartridge is positioned, the stepped convolutions can contact a wall of the cartridge defining the supply chamber in the cartridge and produce a frictional force that opposes normal unwinding of the film. This can result in improperly exposed film. This film stepping problem can be avoided by attaching or cinching the film to a supply ring as well as to the take-up core, and locking both in place by means of a control member which prevents any rotational movement prior to insertion of the film cartridge into a camera. The control member is moved axially to unlock the supply ring and take-up core when the cartridge is inserted into the camera.
Inventors
- 👤 Robert C Sutliff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:10
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/26; G03B17/265
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
99 words
In a film cartridge including a supply ring in a supply chamber and a take-up core in a take-up chamber for use with a roll of film having a tendency to become stepped in the axial direction, the improvement comprising: a control member which is axially moveable from a first, locking position in which said member prevents rotational movement of both the supply ring and the take-up core to a second, release position in which said control member permits rotation of both the supply ring and the take-up core, responsive to the film cartridge being inserted into a camera.
Claim 2
Dependent Claim
99 words
In a film cartridge including a supply ring in a supply chamber and a take-up core in a take-up chamber for use with a roll of film having a tendency to become stepped in the axial direction, the improvement comprising: a control member which is axially moveable from a first, locking position in which said member prevents rotational movement of both the supply ring and the take-up core to a second, release position in which said control member permits rotation of both the supply ring and the take-up core, responsive to the film cartridge being inserted into a camera.
Claim 3
Dependent Claim
40 words
A film cartridge as in claim 1 wherein said control member comprises a first means for preventing rotational movement of said control member in said locking position and for permitting rotational movement of said control member in said release position.
Claim 4
Dependent Claim
39 words
A film cartridge as in claim 2 wherein said control member further comprises a second means for preventing rotation of the supply ring in said locking position and for permitting rotation of the supply ring in said release position.
Claim 5
Dependent Claim
39 words
A film cartridge as in claim 2 wherein said control member further comprises a further means for preventing rotation of the take-up core in said locking position and for permitting rotation of the take-up core in said release position.
Claim 6
Dependent Claim
52 words
A film cartridge as in claim 2 wherein said first means comprises a key projecting from the mid-portion of said control member which, in said locking position, engages in a keyway forming a portion of an interior wall of the cartridge and which, in said release position, is disengaged from said keyway.
Claim 7
Dependent Claim
55 words
A film cartridge as in claim 3 wherein said second means comprises a plurality of flexible fingers located on the supply chamber end of said control member, which, in said locking position, engage with grooves formed in a central opening in the supply ring, and which, in said release position are disengaged from said grooves.
Claim 8
Dependent Claim
57 words
A film cartridge as in claim 4 wherein said further means comprises a plurality of projecting teeth on the Take-up core end of said control member which, in said locking position, interlock with a further plurality of teeth projecting from the take-up core, and which, in said release position are disengaged from said further plurality of teeth.
Claim 9
Dependent Claim
125 words
In combination, a film cartridge and a camera comprising a film cartridge chamber for receiving said film cartridge, said film cartridge including a supply chamber, a take-up chamber, a supply ring located in said supply chamber, a take-up core located in said take-up chamber and a control member axially moveable from a first, locking position in which said member prevents rotational movement of both said supply ring and said take-up core to a second, release position in which said control member permits rotation of both the supply ring and the take-up core, responsive to the film cartridge being inserted into said camera, said film cartridge chamber including a means for causing axial displacement of said control member from said locking position to said release position.
Claim 10
Dependent Claim
125 words
In combination, a film cartridge and a camera comprising a film cartridge chamber for receiving said film cartridge, said film cartridge including a supply chamber, a take-up chamber, a supply ring located in said supply chamber, a take-up core located in said take-up chamber and a control member axially moveable from a first, locking position in which said member prevents rotational movement of both said supply ring and said take-up core to a second, release position in which said control member permits rotation of both the supply ring and the take-up core, responsive to the film cartridge being inserted into said camera, said film cartridge chamber including a means for causing axial displacement of said control member from said locking position to said release position.
Claim 11
Dependent Claim
53 words
A film cartridge chamber as in claim 8 wherein said means for causing displacement of said control member comprises a pin located within said chamber which enters into an opening in the take-up core and causes axial displacement of said control member responsive to the insertion of the film cartridge into the camera.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |