US3559918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film projector
Assignee: Carl Braun KG
•
Filing: 1968-09-26
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Granted: 1971-02-02
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Expires: 1988-09-26
Abstract
Abstract A boxlike film cartridge for use in projectors and having a tangentially arranged film exit opening. The cartridge is arranged to be carried on a pivoting door of the projector housing and carries a film clamping means which is arranged to clamp the film when the motor is automatically switched off by the end of the film passing through the picture gate at the end of rewind, in advance of cessation of rotation of the motor, so as to prevent the film being withdrawn entirely into the cartridge.
Inventors
- 👤 Carl Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:02
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/321; G03B21/323; G03B21/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
187 words
In a film projector comprising an electric drive motor and a housing, the invention which consists in the provision of a film cartridge or cassette comprising: a dish-shaped cartridge part having a planar portion forming a rear wall of the cartridge and a skirt part extending from the periphery of the planar part generally at a right angle to it to terminate at a rim lying in a plane which is plane-parallel to the rear wall, the skirt part having a slit defining a film exit opening for passage of film out of the cartridge for projection; and a planar lid held so that its edge is adjacent to the rim, the lid being plane-parallel to the rear wall, the cartridge being mounted on the projector, and interlocking sliding means made up of a male interlocking component in the form of rail means and a female interlocking component in the form of groove means, one of these components being on the cartridge and the other on the housing of the projector, the rail means lying generally in the same plane as the rear wall of the cartridge.
Claim 2
Dependent Claim
187 words
In a film projector comprising an electric drive motor and a housing, the invention which consists in the provision of a film cartridge or cassette comprising: a dish-shaped cartridge part having a planar portion forming a rear wall of the cartridge and a skirt part extending from the periphery of the planar part generally at a right angle to it to terminate at a rim lying in a plane which is plane-parallel to the rear wall, the skirt part having a slit defining a film exit opening for passage of film out of the cartridge for projection; and a planar lid held so that its edge is adjacent to the rim, the lid being plane-parallel to the rear wall, the cartridge being mounted on the projector, and interlocking sliding means made up of a male interlocking component in the form of rail means and a female interlocking component in the form of groove means, one of these components being on the cartridge and the other on the housing of the projector, the rail means lying generally in the same plane as the rear wall of the cartridge.
Claim 3
Dependent Claim
32 words
The cartridge as set forth in claim 1 further comprising locating pins mounted on the projector housing and extending into holes in at least one of the two parts of the cartridge.
Claim 4
Dependent Claim
58 words
The cartridge as set forth in claim 1 in which the dish-shaped part of the cartridge comprises lip means arranged to overlap an edge of the lid part, and releasable interlocking means engaging the lid at a part remote from the lip means, the lid part being arranged to swivel about an axis close to the lip means.
Claim 5
Dependent Claim
49 words
The cartridge as set forth in claim 1 comprising a transport roller mounted on the projector housing and extending into a pocket forMed by a recessed part of the skirt, an aperture being provided for guiding film out of the cartridge through the pocket for engagement by the roller.
Claim 6
Dependent Claim
48 words
The cartridge as set forth in claim 1 comprising a rotary bush in the cartridge, a film-carrying spool mounted on the bush, the bush positively engaging the spool, and a rotary driving part on the projector housing for fitting into a hole in the bush for rotating it.
Claim 7
Dependent Claim
46 words
The cartridge as set forth in claim 1 in which at a position close to the cartridge opening the cartridge comprises a spring-loaded film clamp, the projector comprising actuating means arranged to engage the clamp and to move it resiliently out of engagement with the film.
Claim 8
Dependent Claim
35 words
The cartridge as set forth in claim 6 comprising means coupling the motor with the clamp actuating means and arranged to causing clamping of the film in advance of cessation of rotation of the motor.
Claim 9
Dependent Claim
32 words
The cartridge as set forth in claim 7 comprising as the actuating means, a solenoid, and means for automatically energizing the solenoid when the film drive motor of the projector is running.
Claim 10
Dependent Claim
28 words
The cartridge as set forth in claim 8 comprising centrifugally operated switch means for switching the solenoid on and off in accordance with operation of the drive motor.
Claim 11
Dependent Claim
18 words
The cartridge as set forth in claim 8 comprising inductively operated means coupling the motor with the solenoid.
Claim 12
Dependent Claim
28 words
The cartridge as set forth in claim 1 comprising a guide roller mounted in the cartridge for guiding film out of the cartridge through the film exit opening.
References Cited (Backward Citations)
US3227508A
Cited
US3431047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |