US3158243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic clutches and brakes
Assignee: Crofts Engineers Ltd
•
Filing: 1960-11-28
•
Granted: 1964-11-24
•
Expires: 1980-11-28
Abstract
No abstract record available.
Inventors
- 👤 Croft Arthur
- 👤 Whiteley Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:05
CPC Classifications
F; F16; F16D; F16D27/00; F16D27/02; F16D27/04; F16D27/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN A MAGNETIC COUPLING SUCH AS A CLUTCH OR BRAKE, THE COMBINATION COMPRISING A ROTATABLE BODY OF MAGNETIC MATERIAL CONNECTIBLE TO A DRIVING MEMBER, SO AS TO BE ROTATED, AND EXCITER COIL MOUNTED ON SAID BODY OF MAGNETIC MATERIAL, A PLURALITY OF FINGERS SECURED TO AND PROJECTING CO-AXIALLY FROM SAID BODY AND DISTRIBUTED AROUND THE PERIPHERY THEREOF IN SPACED RELATION, A DRIVEN MEMBER MOUNTED CO-AXIALLY WITH SAID DRIVING MEMBER, AN ANNULAR CLOSING PLATE OF MAGNETIC MATERIAL FORMING AN ARMATURE AND WHICH SURROUNDS SAID DRIVEN MEMBER, A PACK OF SEPARABLE FRICTION PLATES INTERPOSED BETWEEN SAID CLOSING PLATE AND SAID BODY OF MAGNETIC MATERIAL AND THROUGH WHICH THE MAGNETIC FIELD PASSES, SAID PLATE PACK BEING COMPRISED OF ONE GROUP OF ALTERNATE PLATES ARRANGED TO BE DRIVEN BY SAID FINGERS AND A SECOND GROUP OF ALTERNATE PLATES ARRANGED IN DRIVING RELATION TO SAID DRIVEN MEMBER,
Claim 2
Dependent Claim
142 words
IN A MAGNETIC COUPLING SUCH AS A CLUTCH OR BRAKE, THE COMBINATION COMPRISING A ROTATABLE BODY OF MAGNETIC MATERIAL CONNECTIBLE TO A DRIVING MEMBER, SO AS TO BE ROTATED, AND EXCITER COIL MOUNTED ON SAID BODY OF MAGNETIC MATERIAL, A PLURALITY OF FINGERS SECURED TO AND PROJECTING CO-AXIALLY FROM SAID BODY AND DISTRIBUTED AROUND THE PERIPHERY THEREOF IN SPACED RELATION, A DRIVEN MEMBER MOUNTED CO-AXIALLY WITH SAID DRIVING MEMBER, AN ANNULAR CLOSING PLATE OF MAGNETIC MATERIAL FORMING AN ARMATURE AND WHICH SURROUNDS SAID DRIVEN MEMBER, A PACK OF SEPARABLE FRICTION PLATES INTERPOSED BETWEEN SAID CLOSING PLATE AND SAID BODY OF MAGNETIC MATERIAL AND THROUGH WHICH THE MAGNETIC FIELD PASSES, SAID PLATE PACK BEING COMPRISED OF ONE GROUP OF ALTERNATE PLATES ARRANGED TO BE DRIVEN BY SAID FINGERS AND A SECOND GROUP OF ALTERNATE PLATES ARRANGED IN DRIVING RELATION TO SAID DRIVEN MEMBER,
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |