Patent US3277357A successfully refreshed from Google Patents.
US3277357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control for a rotary device by means of braking
Assignee: Ampex Corp
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Filing: 1963-06-04
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Granted: 1966-10-04
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Expires: 1983-06-04
Abstract
No abstract record available.
Inventors
- 👤 Jack K Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:20
CPC Classifications
H; H02; H02P; H02P29/00; H02P29/0016; H02P29/0022; F; F16; F16D; F16D63/00; F16D63/002; H02P29/0027; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/93; Y10S388/932
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A BRAKING DEVICE FOR A ROTARY SHAFT, COMPRISING: AN ELECTRO-MAGNET INCLUDING A RING MEMBER FIXED IN POSITION COAXIAL WITH AND SPACED FROM SAID SHAFT, SAID RING HAVING AN ANNULAR ELECTRICAL COIL INSET IN ONE SIDE THEREOF COAXIAL WITH SAID SHAFT AND FACING IN ONE AXIAL DIRECTION AND SAID SHAFT; A MAGNETIC BRAKING DISC MOUNTED FOR ROTATION WITH SAID SHAFT CONFRONTING SAID ELECTRO-MAGNET; AN ANNULAR GASKET OF FRICTIONAL MATERIAL DISPOSED BETWEEN SAID MAGNETIC DISK AND SAID ELECTRO-MAGNET; A SPRING DISK MOUNTED ON SAID SHAFT ON THE SIDE OF SAID BRAKING DISK OPPOSITE SAID ELECTRO-MAGNET; AN ANNULAR SHIM ELEMENT DISPOSED BETWEEN THE PERIPHERIES OF SAID SPRING DISK AND BRAKING DISK SO AS TO LOAD SAID SPRING DISK TO URGE SAID BRAKING DISK AND FRICTION GASKET INTO PERPETUAL FRICTIONAL ENGAGEMENT WITH SAID ELECTRO-MAGNET; AND MEANS FOR VARIABLY ENERGIZING SAID ELECTRO-MAGNET TO VARY THE FORCE TO FRICTIONAL ENGAGEMENT OF SAID BRAKING DISK, FRICTION GASKET AND ELECTRO-MAGNET WITHIN A RANGE OF VALUES ALL EXCEEDING THAT PROVIDED BY SAID SPRING DISK.
Claim 2
Dependent Claim
165 words
A BRAKING DEVICE FOR A ROTARY SHAFT, COMPRISING: AN ELECTRO-MAGNET INCLUDING A RING MEMBER FIXED IN POSITION COAXIAL WITH AND SPACED FROM SAID SHAFT, SAID RING HAVING AN ANNULAR ELECTRICAL COIL INSET IN ONE SIDE THEREOF COAXIAL WITH SAID SHAFT AND FACING IN ONE AXIAL DIRECTION AND SAID SHAFT; A MAGNETIC BRAKING DISC MOUNTED FOR ROTATION WITH SAID SHAFT CONFRONTING SAID ELECTRO-MAGNET; AN ANNULAR GASKET OF FRICTIONAL MATERIAL DISPOSED BETWEEN SAID MAGNETIC DISK AND SAID ELECTRO-MAGNET; A SPRING DISK MOUNTED ON SAID SHAFT ON THE SIDE OF SAID BRAKING DISK OPPOSITE SAID ELECTRO-MAGNET; AN ANNULAR SHIM ELEMENT DISPOSED BETWEEN THE PERIPHERIES OF SAID SPRING DISK AND BRAKING DISK SO AS TO LOAD SAID SPRING DISK TO URGE SAID BRAKING DISK AND FRICTION GASKET INTO PERPETUAL FRICTIONAL ENGAGEMENT WITH SAID ELECTRO-MAGNET; AND MEANS FOR VARIABLY ENERGIZING SAID ELECTRO-MAGNET TO VARY THE FORCE TO FRICTIONAL ENGAGEMENT OF SAID BRAKING DISK, FRICTION GASKET AND ELECTRO-MAGNET WITHIN A RANGE OF VALUES ALL EXCEEDING THAT PROVIDED BY SAID SPRING DISK.
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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |