Patent US3215874A successfully refreshed from Google Patents.
US3215874A
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Magnetic clutch
Assignee: Emerson Electric Co
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Filing: 1961-07-24
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Granted: 1965-11-02
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Expires: 1981-07-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Richard C Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:07
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
IN A MAGNETIC CLUTCH STRUCTURE: A PAIR OF CLUTCH ELEMENTS; MEANS MOUNTING EACH OF THE ELEMENTS FOR ROTATION ABOUT A COMMON AXIS; ANUMBER OF CONCENTRIC RINGS OF MAGNETIC MATERIAL AND OF DIFFERENT DIAMETERS HAVING CORRESPONDING ENDS ATTACHED TO ONE OF THE ELEMENTS; THE OTHER ENDS OF THE RINGS BEING FREE; AND A NUMBER OF CONCENTRIC RINGS OF MAGNETIC MATERIAL AND OF DIFFERENT DIAMETERS HAVING CORRESPONDING ENDS ATTACHED TO THE OTHER OF THE ELEMENTS, THE OTHER ENDS OF THE RINGS BEING FREE; THE FREE ENDS OF EACH OF THE SETS OF RINGS PROJECTING WITH END CLEARANCE BETWEEN THE RINGS OF THE OTHER SET OF RINGS; THE INTERMEDIATE RINGS AND ONE END RING HAVING NON-ANNULAR SURFACES OPPOSING ANNULAR SURFACES OF THE NEXT ADJACENT RING TO FORM AREAS OF FLUX CONCENTRATION UPON THE IMPOSITION OF A MAGNETO-MOTIVE FORCE RADIALLY OF THE RINGS, AND ALSO TO FORM PASSAGES FOR COOLING FLUID BETWEEN THE RINGS, THE PASSAGES BEING JOINED SINUOUSLY TOGETHER AT THE CLEARANCE SPACES AT THE SAID ONE ENDS OF THE RINGS.
Claim 2
Dependent Claim
168 words
IN A MAGNETIC CLUTCH STRUCTURE: A PAIR OF CLUTCH ELEMENTS; MEANS MOUNTING EACH OF THE ELEMENTS FOR ROTATION ABOUT A COMMON AXIS; ANUMBER OF CONCENTRIC RINGS OF MAGNETIC MATERIAL AND OF DIFFERENT DIAMETERS HAVING CORRESPONDING ENDS ATTACHED TO ONE OF THE ELEMENTS; THE OTHER ENDS OF THE RINGS BEING FREE; AND A NUMBER OF CONCENTRIC RINGS OF MAGNETIC MATERIAL AND OF DIFFERENT DIAMETERS HAVING CORRESPONDING ENDS ATTACHED TO THE OTHER OF THE ELEMENTS, THE OTHER ENDS OF THE RINGS BEING FREE; THE FREE ENDS OF EACH OF THE SETS OF RINGS PROJECTING WITH END CLEARANCE BETWEEN THE RINGS OF THE OTHER SET OF RINGS; THE INTERMEDIATE RINGS AND ONE END RING HAVING NON-ANNULAR SURFACES OPPOSING ANNULAR SURFACES OF THE NEXT ADJACENT RING TO FORM AREAS OF FLUX CONCENTRATION UPON THE IMPOSITION OF A MAGNETO-MOTIVE FORCE RADIALLY OF THE RINGS, AND ALSO TO FORM PASSAGES FOR COOLING FLUID BETWEEN THE RINGS, THE PASSAGES BEING JOINED SINUOUSLY TOGETHER AT THE CLEARANCE SPACES AT THE SAID ONE ENDS OF THE RINGS.
References Cited (Backward Citations)
GB558961A
Cited
US2488827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |