Patent US3797923A successfully refreshed from Google Patents.
US3797923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cinematographic projector
Assignee: Bolex International SA
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Filing: 1972-10-10
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Granted: 1974-03-19
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Expires: 1992-10-10
Abstract
Abstract A movie projector for showing film cassettes that each have a take-up spool and a feed spool, the projector comprising a cassette projection station and a cassette rewind station, transfer apparatus for moving each of at least two cassettes one after the other into the projection station then into the rewind station, a first mechanism for engaging the take-up spool when in the projection station to wind film onto the cassette take-up spool and a second mechanism for engaging the feed spool when in the rewind station to rewind film onto the cassette feed spool, drive apparatus for concurrently driving the first and second mechanisms to concurrently wind and rewind the respective cassettes, and apparatus for controlling engagement of the first and second mechanisms with the respective take-up and feed spools for the winding and rewinding thereof and disengagement thereof to permit movement of the cassette from the projection station into the rewind station by the transfer apparatus.
Inventors
- 👤 L Thevenaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:15
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/321; G03B21/323; G03B21/43
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
242 words
A movie projector for showing film cassettes that each have a take-up spool and a feed spool, said projector comprising (a) a cassette projection station and a cassette rewind station, (b) transfer means for moving each of at least two cassettes one after the other into the projection station than into the rewind station, (c) a first mechanism for operatively engaging the takeup spool when in the projection station to wind film onto the cassette take-up spool and (d) a second mechanism for operatively engaging the feed spool when in the rewind station to rewind film onto the cassette feed spool, (e) drive means for concurrently driving said first and second mechanisms to concurrently wind and rewind the respective cassettes, and (f) control means for controlling engagement of said first and second mechanisms with the respective take-up and feed spools for concurrent winding and rewinding thereof and for controlling the disengagement thereof to permit movement of the cassette from the projection station into the rewind station by the transfer means, said transfer means comprising plate means for supporting the cassettes when in the projection and rewind stations and wherein said first and second mechanisms comprise upstanding first and second drive shafts adapted to engage the hubs of take-up and feed spools, respectively, and said control means comprises means for relatively moving said shafts and plate means so that the shafts penetrate the plate means to engage the respective take-up and feed spoolds.
Claim 2
Dependent Claim
242 words
A movie projector for showing film cassettes that each have a take-up spool and a feed spool, said projector comprising (a) a cassette projection station and a cassette rewind station, (b) transfer means for moving each of at least two cassettes one after the other into the projection station than into the rewind station, (c) a first mechanism for operatively engaging the takeup spool when in the projection station to wind film onto the cassette take-up spool and (d) a second mechanism for operatively engaging the feed spool when in the rewind station to rewind film onto the cassette feed spool, (e) drive means for concurrently driving said first and second mechanisms to concurrently wind and rewind the respective cassettes, and (f) control means for controlling engagement of said first and second mechanisms with the respective take-up and feed spools for concurrent winding and rewinding thereof and for controlling the disengagement thereof to permit movement of the cassette from the projection station into the rewind station by the transfer means, said transfer means comprising plate means for supporting the cassettes when in the projection and rewind stations and wherein said first and second mechanisms comprise upstanding first and second drive shafts adapted to engage the hubs of take-up and feed spools, respectively, and said control means comprises means for relatively moving said shafts and plate means so that the shafts penetrate the plate means to engage the respective take-up and feed spoolds.
Claim 3
Dependent Claim
73 words
A projector according to claim 1 wherein said plate means comprises two independent plates, two separate mechanisms each actuated by a cam coupled to the mechanical power source for the projector, each said separate mechanism coupled to one of said plates to lift separately the plate associated with the first cassette after is is rewound and to lift separately the plate associated with the second cassette after the film it contains is projected.
Claim 4
Dependent Claim
39 words
A projector as set forth in claim 1 comprising magazine means for storing a plurality of cassettes and for feeding them one at a time to the projection station, when the foremost cassette is moved into the rewind station.
Claim 5
Dependent Claim
23 words
A projector as set forth in claim 1 wherein the plate means comprises a single plate extending into the projection and rewind stations.
Claim 6
Dependent Claim
63 words
A projector according to claim 1 wherein the plate means comprises a first plate at the projection station and a second plate at the rewind station and said means for relatively moving comprises two independent mechanisms each driven by a cam mechanism and each coupled to one of the first and second plates for operatively moving each respective said first and second plates.
Claim 7
Dependent Claim
37 words
A projector according to claim 1 in which said transfer means comprises a push-lever means for moving the cassette in the projection position after it has been lifted free of the respective shaft by said plate means.
Claim 8
Dependent Claim
58 words
A projector according to claim 1 further comprising (a) spaced rollers to engage the film when the cassette is in the projection and rewind positions, respectively, to guide the movement of the film in predetermined paths during projection and rewinding and (b) a linkage means for moving the rollers into and out of engagement with the respective film.
Claim 9
Dependent Claim
34 words
A projector according to claim 3 in which the magazine is located above the projection station and said plate means being in vertical alignment with and forming a movable floor for said magazine means.
Claim 10
Dependent Claim
40 words
A projector according to claim 1 in which the transfer means comprises a push lever movable to engage the cassette in the projection station after the cassette has been moved by said plate means to disengage its associated drive shaft.
Claim 11
Dependent Claim
52 words
A projector according to claim 9 further comprising two roller assemblies operatively coupled to take up the film slack contained in the cassettes when said cassettes are in the projecting and rewinding positions respectively, said assemblies being operable By the action of a cam coupled to the mechanical drive of the projector.
Claim 12
Dependent Claim
24 words
A projector according to claim 10 further comprising a clutch assembly operative and selectively coupling the cam to the mechanical drive of the projector.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |