US3584250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the takeup reel of film projection apparatus
Assignee: FONOVISIONE SpA SOC INT
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Filing: 1969-10-01
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Granted: 1971-06-08
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Expires: 1989-10-01
Abstract
Abstract A takeup reel and drive therefor in the form of a magnetic field coupling and a motor are mounted on the housing wall of projection apparatus. The output member of the coupling has a shaft which caries a concentric ring of highly permeable magnetic material rotatable without engagement in an adjustable airgap between pairs of magnets mounted on the input rotor of the coupling.
Inventors
- 👤 Angelo Bottani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:18
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/43
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
154 words
In combination, a support, a magnetic coupling comprising a rotor including an axial shaft, means for mounting said shaft for rotation relative to said support, and a cage assembly mounted for rotation relative to both said rotor and said support, said rotor further including a ring of magnetically permeable material concentric with and fixed relative to said shaft, said cage assembly including a peripheral housing and two end cover plates, a pair of permanent magnets, one of said permanent magnets fixed to each cover plate at one end of each of said magnets and the other end of each of said magnets being in close confronting spaced relation with said ring of magnetically permeable material, a drive motor fixed to said support, means for drivingly connecting said drive motor to one of said cage assembly and said shaft, the other of said cage assembly and said shaft serving as an output for said coupling.
Claim 2
Dependent Claim
154 words
In combination, a support, a magnetic coupling comprising a rotor including an axial shaft, means for mounting said shaft for rotation relative to said support, and a cage assembly mounted for rotation relative to both said rotor and said support, said rotor further including a ring of magnetically permeable material concentric with and fixed relative to said shaft, said cage assembly including a peripheral housing and two end cover plates, a pair of permanent magnets, one of said permanent magnets fixed to each cover plate at one end of each of said magnets and the other end of each of said magnets being in close confronting spaced relation with said ring of magnetically permeable material, a drive motor fixed to said support, means for drivingly connecting said drive motor to one of said cage assembly and said shaft, the other of said cage assembly and said shaft serving as an output for said coupling.
Claim 3
Dependent Claim
38 words
The combination of claim 1, wherein one of said end cover plates is threadedly mounted on said peripheral housing for adjusting the spacing between said other end of the permanent magnet secured thereto and said magnetically permeable ring.
Claim 4
Dependent Claim
47 words
The combination of claim 1, further comprising at least two additional permanent magnets, one of each of said additional magnets being fixed respectively to one each of said cover plates and the other end of each being in close spaced confronting relation with said magnetically permeable ring.
Claim 5
Dependent Claim
33 words
The combination of claim 1, said cage assembly being mounted for rotation relative to said rotor by a pair of spaced-apart bearings disposed on said shaft and rotatably supporting said end cover plates.
Claim 6
Dependent Claim
51 words
The combination of claim 4, one of said bearings being axially movable on said shaft, and the end cover plate supported by said one bearing being threadedly connected to said peripheral housing for adjusting the spacing between said other end of said permanent magnet received thereto and said magnetically permeable ring.
Claim 7
Dependent Claim
79 words
The combination of claim 3, said cage assembly being mounted for rotation relative to said rotor by a pair of spaced-apart bearings disposed on said shaft and rotatably supporting said end cover plates, one of said bearings being axially moveable on said shaft, and the end cover plate supported by said one bearing being threadedly connected to said peripheral housing for adjusting the spacing between said other ends of said permanent magnets received thereto and said magnetically permeable ring.
Claim 8
Dependent Claim
24 words
The combination of claim 1, wherein said drive motor is connected to said cage assembly and said shaft is the output for said coupling.
Claim 9
Dependent Claim
24 words
The combination of claim 6, wherein said drive motor is connected to said cage assembly and said shaft is the output for said coupling.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |