Patent US3898769A successfully refreshed from Google Patents.
US3898769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for centreless magnetic abrasive polishing
Assignee: ZNIITMASH
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Filing: 1974-04-16
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Granted: 1975-08-12
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Expires: 1994-04-16
Abstract
Abstract A method and apparatus for the centreless polishing of a workpiece is provided. Two cylindrical rolls are positioned with respect to each other such that their axes are not parallel and the axis of the workpiece is above the plane of the axes of the rolls. A guide is provided to support the workpiece. At least one of the rolls includes at least one electromagnet formed by a coil and a pair of disks. A guide ring is positioned around the coil in the space between the disks. A ferromagnetic powder is held on the disks which form the poles of the electromagnet and this powder is the abrasive which polishes the workpiece as the rolls rotate.
Inventors
- 👤 Boris Georgiev Makedonski
- 👤 Atanas Dimitrov Kochemidov
- 👤 Ivan Minkov Dumanov
- 👤 Stefan Georgiev Payakov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:14
CPC Classifications
B; B24; B24D; B24D99/00; B24B; B24B5/00; B24B5/18; B24B5/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
An apparatus for the centreless polishing of a workpiece said apparatus comprising two cylindrical roll means and a guide means for supporting said workpiece wherein said roll means are positioned with respect to each other such that their axes are not parallel and the axis of said workpiece is above the plane formed by the axes of said roll means, and wherein at least one of said roll means comprises at least one electromagnetic means, at least two guide rings with a working gap therebetween and a ferromagnetic powder in said working gap said ferromagnetic powder being held therein by said electromagnetic means.
Claim 2
Independent Claim
103 words
An apparatus for the centreless polishing of a workpiece said apparatus comprising two cylindrical roll means and a guide means for supporting said workpiece wherein said roll means are positioned with respect to each other such that their axes are not parallel and the axis of said workpiece is above the plane formed by the axes of said roll means, and wherein at least one of said roll means comprises at least one electromagnetic means, at least two guide rings with a working gap therebetween and a ferromagnetic powder in said working gap said ferromagnetic powder being held therein by said electromagnetic means.
Claim 3
Dependent Claim
45 words
The apparatus of claim 1 wherein said electromagnetic means comprises a pair of disks and an electromagnetic coil therebetween wherein said guide rings surround said electromagnetic coil and the circumferential surface of said disks form said working gap and the poles of said electromagnetic means.
Claim 4
Dependent Claim
18 words
The apparatus of claim 2 including a protective ring positioned between said electromagnetic coil and said guide ring.
Claim 5
Dependent Claim
16 words
The apparatus of claim 1 wherein said at least one roll means comprises two roll means.
Claim 6
Dependent Claim
28 words
The apparatus of claim 1 wherein said at least one roll means comprises one roll means and the other of said two roll means comprises a guide roll.
Claim 7
Dependent Claim
19 words
The apparatus of claim 1 further including a protective cover means surrounding a substantial portion of said roll means.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |