US3702997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head loading system for magnetic memory disk drives
Assignee: Diablo Systems Inc
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Filing: 1971-11-15
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Granted: 1972-11-14
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Expires: 1991-11-15
Abstract
Abstract A head loading system for a disk drive where levers extend from the support fingers of each of the read/write heads which are coupled to a radially movable carriage. The levers are capable of being contacted with rotatable bails at any position of the head to control the ''''flying'''' or loading and raising of the heads. An electromagnet rotates the bails for loading. A return spring acts as fail-safe means in case of power failure to raise the heads from a memory disk at any tracking position. The lever-bail arrangement reduces the mass of the carriage.
Inventors
- 👤 John W Jamieson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:53
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
A head loading system for magnetic memory disk drive apparatus comprising: a carriage movable in a radial direction relative to a memory disk; a pair of read/write heads; individual support finger means for coupling each of said heads to said carriage each finger means having a relatively rigid portion carrying said head and being coupled to said carriage by a relatively flexible portion which is flexible in a direction towards and away from a memory disk; a lever extending in said radial direction from each of said rigid portions; means for moving said carriage and said heads in a radial direction from a retracted position where said heads are moved away from said disk to a predetermined plurality of tracking positions; means for biasing said heads toward said disk; rotatable bail means mounted on fixed pivot points and capable of contacting said levers throughout movement of said heads from said retract position through said tracking positions; and means for controllably rotating said bail means for allowing said biasing means to load said heads on a rotation disk.
Claim 2
Dependent Claim
177 words
A head loading system for magnetic memory disk drive apparatus comprising: a carriage movable in a radial direction relative to a memory disk; a pair of read/write heads; individual support finger means for coupling each of said heads to said carriage each finger means having a relatively rigid portion carrying said head and being coupled to said carriage by a relatively flexible portion which is flexible in a direction towards and away from a memory disk; a lever extending in said radial direction from each of said rigid portions; means for moving said carriage and said heads in a radial direction from a retracted position where said heads are moved away from said disk to a predetermined plurality of tracking positions; means for biasing said heads toward said disk; rotatable bail means mounted on fixed pivot points and capable of contacting said levers throughout movement of said heads from said retract position through said tracking positions; and means for controllably rotating said bail means for allowing said biasing means to load said heads on a rotation disk.
Claim 3
Dependent Claim
36 words
A system as in claim 1 where said means for controllably rotating said bail means includes spring means for biasing said bail means toward an unrotated position where said heads are spaced upwardly from said disk.
Claim 4
Dependent Claim
26 words
A system as in claim 2 where said rotating means also includes an electromagnet for overcoming said biasing of said spring means to load said heads.
Claim 5
Dependent Claim
26 words
A system as in claim 1 where said means for biasing said heads towards said disk includes spring means between opposed pairs of said extending levers.
Claim 6
Dependent Claim
16 words
A system as in claim 1 where said levers include rollers for contacting said bail means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |