Patent US4764828A successfully refreshed from Google Patents.
US4764828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc and hub centering device for use in magnetic disc drives
Assignee: Samsung Electronics Co Ltd
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Filing: 1987-03-26
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Granted: 1988-08-16
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Expires: 2007-03-26
Abstract
Abstract Each spacer separating adjacent discs in a magnetic disc drive includes an insert having a body portion having a height equal to the height of the spacer and with a plurality of finger portions extending from the body portion less than one-half the thickness of a disc, the finger portions separating a disc from the hub and permitting movement of a disc relative to the hub during temperature cycling. Each insert further includes a plurality of cavities in the body portion in association with the finger portions for accommodating a finger which might be folded during assembly of the discs on the hub.
Inventors
- 👤 Lawrence W. Gollbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:38
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/14; G11B17/00; G11B17/02; G11B17/038; G11B23/00; G11B23/0014; G11B23/0021
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
For use with a disc spacer in mounting a magnetic disc on a rotating hub in a disc drive, an insert for the spacer comprising a body portion having a height equal to the height of the spacer, and a plurality of finger portions extending above the height of the body portion less than one-half the thickness of a disc, said finger portions separating a disc from the hub and permitting movement of a disc relative to the hub during temperature cycling.
Claim 2
Dependent Claim
82 words
For use with a disc spacer in mounting a magnetic disc on a rotating hub in a disc drive, an insert for the spacer comprising a body portion having a height equal to the height of the spacer, and a plurality of finger portions extending above the height of the body portion less than one-half the thickness of a disc, said finger portions separating a disc from the hub and permitting movement of a disc relative to the hub during temperature cycling.
Claim 3
Dependent Claim
28 words
The insert as defined by claim 1 and further including a plurality of cavities in said body portion in association with said finger portions for accommodating folded finger.
Claim 4
Dependent Claim
35 words
The insert as defined by claim 2 and further including a plurality of finger portions extending from said body portion below the height of the body portion less than one-half the thickness of a disc.
Claim 5
Dependent Claim
22 words
The insert as defined by claim 3 wherein said body portion and said plurality of finger portions are formed of injection-molded plastic.
Claim 6
Dependent Claim
122 words
In a disc drive assembly, the combination comprising a hub, a plurality of discs assembled on said hub, a spacer ring between adjacent discs, and an insert in each spacer ring including a body portion having a height equal to the height of the spacer, and a first plurality of finger portions extending from said body portion above the height of the body portion less than one-half of the thickness of a disc, a second plurality of finger portions extending from said body portion below the height of the body portion less than one-half of the thickness of a disc, said finger portions separating the disc from the hub and permitting movement of a disc relative to said hub during temperature cycling.
Claim 7
Dependent Claim
122 words
In a disc drive assembly, the combination comprising a hub, a plurality of discs assembled on said hub, a spacer ring between adjacent discs, and an insert in each spacer ring including a body portion having a height equal to the height of the spacer, and a first plurality of finger portions extending from said body portion above the height of the body portion less than one-half of the thickness of a disc, a second plurality of finger portions extending from said body portion below the height of the body portion less than one-half of the thickness of a disc, said finger portions separating the disc from the hub and permitting movement of a disc relative to said hub during temperature cycling.
Claim 8
Dependent Claim
34 words
The combination as defined by claim 5 wherein each of said inserts further includes a plurality of cavities in said body portion in association with said finger portions for accommodating a folder finger portion.
Claim 9
Dependent Claim
15 words
The combination as defined by claim 6 wherein said insert is formed from injection-molded plastic.
References Cited (Backward Citations)
US4315288A
Cited
US4683505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |