Patent US4845816A successfully refreshed from Google Patents.
US4845816A
Expired / Lapsed
US
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Burnishing head for memory disk drive
Assignee: XEBEC CORP
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Filing: 1988-09-12
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Granted: 1989-07-11
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Expires: 2008-09-12
Abstract
Abstract A contact burnishing head is described for memory surfaces of computer memory disks. The operating surface of the burnishing head is defined by a regular pattern of diamond-shaped protrusions. In one embodiment, a ramp face is provided along the leading edge of the head in order to prevent large asperities in the disk surface from interfering with proper burnishing. In another embodiment, two opposed edges of the head are provided with ramp faces so that a single head design can be used to burnish either the upper or the lower surface of a computer disk.
Inventors
- 👤 Leonard Nanis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/8404; B; B24; B24B; B24B39/00; B24B39/06; Y; Y10; Y10T; Y10T29/00; Y10T29/47
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
131 words
A contact burnishing head for memory surfaces of computer disks comprising a body having a multiple number of cutters comprising protrusions in line with one another in four different directions forming successively aligned cutting edges for sequential reduction of a surface asperity, said body having at least one channel adjacent each of said cutters to accept debris removed from a disk surface; means for maintaining the cutters of said body and said channel in contact with a disk surface to be burnished; and means for providing relative movement between said body and said disk surface to present said successively aligned cutting edges sequentially to a single asperity to be burnished on said disk surface and maintaining said channel oblique to the direction of movement between said disk surface and said body.
Claim 2
Dependent Claim
131 words
A contact burnishing head for memory surfaces of computer disks comprising a body having a multiple number of cutters comprising protrusions in line with one another in four different directions forming successively aligned cutting edges for sequential reduction of a surface asperity, said body having at least one channel adjacent each of said cutters to accept debris removed from a disk surface; means for maintaining the cutters of said body and said channel in contact with a disk surface to be burnished; and means for providing relative movement between said body and said disk surface to present said successively aligned cutting edges sequentially to a single asperity to be burnished on said disk surface and maintaining said channel oblique to the direction of movement between said disk surface and said body.
Claim 3
Dependent Claim
50 words
A contact burnishing head according to claim 1 wherein the surface of said body having said cutters is generally planar at said cutters, and each of said cutters comprises one or more cutting edges defined by depressions in said surface, said depressions providing a plurality of said channels for debris.
Claim 4
Dependent Claim
32 words
A contact burnishing head according to claim 1 wherein said means for causing movement of said body relative to said disk causes angular relative movement between the same in a single direction.
Claim 5
Dependent Claim
74 words
A contact burnishing head according to claim 1 wherein said surface of said head is defined by a generally regular pattern of diamond-shaped protrusions, each of which provides two linear cutting edges which intersect at a point and each of which is separated from the adjacent diamond-shaped protrusions by a channel, the cutting edges of each of said protrusions facing generally in the single direction of relative movement between said body and said disk.
Claim 6
Dependent Claim
60 words
A contact burnishing head according to claim 1 in which that portion of said body including said multiple number of cutters which first confronts a surface asperity on the surface of said disk is provided with a leading edge ramp that is inclined away from said disk surface relative to a following section of said head surface providing said cutters.
Claim 7
Dependent Claim
23 words
A contact burnishing head according to claim 5 further including an inclined trailing edge which succeeds said following section during said relative movement.
Claim 8
Dependent Claim
59 words
A contact burnishing head according to claim 1 wherein said body has a multiple number of said cutters both in line with one another to be presented sequentially to a single spot on the surface of said disk and in a direction generally orthogonal thereto to sweep more than one spot of said disk surface upon said relative movement.
Claim 9
Dependent Claim
25 words
A contact burnishing head according to claim 1 wherein said cutters are provided as cutting edges in a generally planar surface of said burnishing head.
Claim 10
Dependent Claim
50 words
A contact burnishing head according to claim 8 wherein said surface of said head is defined by a generally regular pattern of diamond-shaped protrusions, each of which provides two linear cutting edges which intersect at a point and each of which is separated from adjacent diamond-shaped protrusions by a channel.
Claim 11
Independent Claim
136 words
A method of burnishing the surface of a memory disk comprising the steps of: (a) providing a contact burnishing head presenting a plurality of cutters comprising protrusions in line with one another in four different directions forming successively aligned cutting edges and at least one channel adjacent each of said cutters to accept debris from a disk surface; (b) mounting said head in contact with a memory disk surface to be burnished at an orientation presenting said cutters to said surface for cutting action of said cutters relative to said surface; and (c) moving said burnishing head body relative to said disk surface to present said successively aligned cutting edges sequentially to a single spot on the surface of said disk to be burnished while maintaining said channel oblique to the direction of said relative movement.
Claim 12
Independent Claim
136 words
A method of burnishing the surface of a memory disk comprising the steps of: (a) providing a contact burnishing head presenting a plurality of cutters comprising protrusions in line with one another in four different directions forming successively aligned cutting edges and at least one channel adjacent each of said cutters to accept debris from a disk surface; (b) mounting said head in contact with a memory disk surface to be burnished at an orientation presenting said cutters to said surface for cutting action of said cutters relative to said surface; and (c) moving said burnishing head body relative to said disk surface to present said successively aligned cutting edges sequentially to a single spot on the surface of said disk to be burnished while maintaining said channel oblique to the direction of said relative movement.
Claim 13
Dependent Claim
41 words
A method according to claim 10 wherein said step of moving said body relative to said disk comprises moving the same to present at least two of said cutters sequentially to a single spot on the surface of said memory disk.
Claim 14
Dependent Claim
69 words
A method according to claim 11 wherein said cutters are provided by depressions in a generally flat surface of said burnishing head which form cutting edges at the junctions between said depressions and said surface, and further comprising the step of contacting said surface of said disk to be burnished with said flat surface of said burnishing head to provide said sequential presentation of cutters of said single spot.
Claim 15
Dependent Claim
96 words
A method according to claim 10 wherein each of said cutters provides one or more linear cutting edges and said step of mounting said head at an orientation presenting said cutters to the memory disk surface to be burnished comprises mounting said head to present a cutting edge of each of said cutters at an angle to the relative direction of movement between said disk surface and said burnishing head body, and further comprising the step of maintaining said angular relationship between each of said cutting edges and said direction of relative movement during said movement.
Claim 16
Dependent Claim
112 words
A contact burnishing head for memory surfaces of computer disks comprising a body having a burnishing surface defined by a generally regular pattern of protrusions, each of which provides at least two linear cutting edges which intersect at a point and each of which is separated from adjacent protrusions by channels for accepting debris removed from a disk surface; means for maintaining at least a portion of the burnishing surface in contact with a disk surface to be burnished; and means for providing relative movement between said body and said disk surface presenting said cutting edges to said disk surface while maintaining said channels oblique to the direction of said relative movement.
Claim 17
Dependent Claim
112 words
A contact burnishing head for memory surfaces of computer disks comprising a body having a burnishing surface defined by a generally regular pattern of protrusions, each of which provides at least two linear cutting edges which intersect at a point and each of which is separated from adjacent protrusions by channels for accepting debris removed from a disk surface; means for maintaining at least a portion of the burnishing surface in contact with a disk surface to be burnished; and means for providing relative movement between said body and said disk surface presenting said cutting edges to said disk surface while maintaining said channels oblique to the direction of said relative movement.
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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) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |