Patent US3780635A successfully refreshed from Google Patents.
US3780635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spool holder for roll film cameras
Assignee: Rollei Werke Franke und Heidecke GmbH and Co KG
•
Filing: 1972-04-14
•
Granted: 1973-12-25
•
Expires: 1992-04-14
Abstract
Abstract A spool holder for holding a roll film supply spool and take-up spool, the holder with the spools mounted therein being insertable in or removable from an appropriate camera body constructed to receive it, or a detachable back section or cassette section of a camera body. The holder contains driving keys and mounting pins or stub shafts for both spools, the driving keys being at diagonally opposite corners of the holder. Thus the holder may be inserted in the camera body in either one of two positions, rotated 180* with respect to each other about the optical axis. When the film on the supply spool has been used up, the former supply spool now becomes the take-up spool when the holder is inserted in the camera in a position turned 180* from its former position, thus avoiding the customary step of removing the empty supply spool and re-inserting it in the camera in the take-up position.
Inventors
- 👤 C Prochnow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:08
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/28; G03B17/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
A spool holder for roll film cameras, attachable to and removable as a unit from a camera of the type having a film advance gear, said holder comprising a frame, means on said frame for removably mounting twO film spools for rotation relative to said frame, two spool keys rotatably mounted on said frame for driving engagement with the respective spools, and two coupling elements, one operatively connected to each spool key to drive such spool key, one coupling element being positioned to engage and be driven by a film advance gear of a camera while the spool holder is attached to the camera in a first position of orientation, the other coupling element being positioned to engage and be driven by the same film advance gear of the camera while the spool holder is attached to the camera in a reversed second position of orientation turned 180* with respect to said first position of orientation.
Claim 2
Dependent Claim
156 words
A spool holder for roll film cameras, attachable to and removable as a unit from a camera of the type having a film advance gear, said holder comprising a frame, means on said frame for removably mounting twO film spools for rotation relative to said frame, two spool keys rotatably mounted on said frame for driving engagement with the respective spools, and two coupling elements, one operatively connected to each spool key to drive such spool key, one coupling element being positioned to engage and be driven by a film advance gear of a camera while the spool holder is attached to the camera in a first position of orientation, the other coupling element being positioned to engage and be driven by the same film advance gear of the camera while the spool holder is attached to the camera in a reversed second position of orientation turned 180* with respect to said first position of orientation.
Claim 3
Dependent Claim
35 words
A holder as defined in claim 1, wherein one of said coupling elements is adjacent one lateral edge of said frame and the other coupling element is adjacent the opposite lateral edge of said frame.
Claim 4
Dependent Claim
55 words
A holder as defined in claim 1, wherein each of said coupling elements is a spur gear, one or the other of such gears being arranged to mesh with a film advance gear in the camera when said spool holder is applied to the camera in one or the other of its two operative positions.
Claim 5
Dependent Claim
58 words
A holder as defined in claim 1, wherein said means for mounting said spools includes two pins, one at the opposite end of each spool from its respective key, each of said pins being resiliently mounted to yield axially away from its spool to enable insertion and removal of a spool between a key and its respective pin.
Claim 6
Dependent Claim
22 words
A holder as defined in claim 1, further including film guide rollers (12-15 or 32-35) for guiding film in an image plane.
Claim 7
Dependent Claim
35 words
A holder as defined in claim 5, wherein said two spools (10, 11) are located substantially at opposite ends of the holder frame, beyond the limits of an image area in which exposure is effected.
Claim 8
Dependent Claim
32 words
A holder as defined in claim 5, wherein said two spools (30, 31) are located behind an image area in which exposure is effected, in partially overlapping relation to such image area.
Claim 9
Dependent Claim
65 words
A holder as defined in claim 5, wherein said film guide rollers include film guide rollers (32, 34 and 33, 35) at opposite ends of an image area in which exposure is effected, and wherein the distance between the axes of the film guide rollers at opposite ends of said image area is greater than the distance between the axes of the two film spools.
Claim 10
Dependent Claim
43 words
A holder as defined in claim 8, wherein said holder is equipped with its own resiliently mounted film pressure plate (37) mounted for movement relative to the holder frame in a direction perpendicular to the plane of the film in the image area.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |