US3975769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage device utilizing flexible magnetic disks
Assignee: International Business Machines Corp
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Filing: 1975-02-07
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Granted: 1976-08-17
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Expires: 1995-02-07
Abstract
Abstract A magnetic storage device having a stack of spaced flexible magnetic disks and an access arm carrying a magnetic transducer moveable between adjacent disks in the stack for accessing the disk surfaces. The access arm is blunt on one side edge and is sharp on the other side edge and increases gradually in thickness from the sharp edge to a position of maximum arm thickness adjacent the blunt edge at which the magnetic transducer is embedded in the arm. The disks rotate so as to move across the arm from the sharp edge toward the blunt edge, and the disks thus closely follow the surfaces of the access arm and particularly the surface of the transducer.
Inventors
- 👤 Francis Kong King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
209 words
A magnetic storage device comprising a spindle; a stack of spaced magnetic flexible disks disposed on and fixed with respect to said spindle; an access arm; said arm having an attachment base portion and a distal end and in cross section having a sharp side edge and a blunt side edge and first and second opposite curved disk complying surfaces connecting said edges; means for moving said arm along the periphery of the stack of disks to a selected location opposite a space between a pair of the disks; means for moving said arm between said pair of disks to have said curved surfaces lying along the surfaces of said pair of disks; a transducer carried by and embedded in said arm adjacent said distal end and between said blunt and sharp edges and having a portion with a rounded outer surface protruding from one of said curved disk complying arm surfaces; and means for drivingly rotating said spindle and thereby said disks in such direction so that, with said arm lying between said pair of disks, the disks move across said curved surfaces of said arm from said sharp edge to said blunt edge for securing close compliance of one of said pair of disks with said transducer.
Claim 2
Dependent Claim
209 words
A magnetic storage device comprising a spindle; a stack of spaced magnetic flexible disks disposed on and fixed with respect to said spindle; an access arm; said arm having an attachment base portion and a distal end and in cross section having a sharp side edge and a blunt side edge and first and second opposite curved disk complying surfaces connecting said edges; means for moving said arm along the periphery of the stack of disks to a selected location opposite a space between a pair of the disks; means for moving said arm between said pair of disks to have said curved surfaces lying along the surfaces of said pair of disks; a transducer carried by and embedded in said arm adjacent said distal end and between said blunt and sharp edges and having a portion with a rounded outer surface protruding from one of said curved disk complying arm surfaces; and means for drivingly rotating said spindle and thereby said disks in such direction so that, with said arm lying between said pair of disks, the disks move across said curved surfaces of said arm from said sharp edge to said blunt edge for securing close compliance of one of said pair of disks with said transducer.
Claim 3
Dependent Claim
51 words
A magnetic storage device as set forth in claim 1 in which said second curved disk complying surface has a larger radius than that of said first curved disk complying surface and in which said rounded outer surface of said transducer protrudes from said second, larger radius, curved disk complying surface.
Claim 4
Dependent Claim
56 words
A magnetic storage device as set forth in claim 2, said blunt edge for a major portion of its length being substantially straight and said sharp edge for a major portion of its length being curved and extending toward said blunt edge so as to decrease the width of said arm toward its said distal end.
Claim 5
Dependent Claim
34 words
A magnetic storage device as set forth in claim 2, said access arm decreasing in width between said blunt and sharp edges toward said distal end and decreasing in thickness toward said distal end.
Claim 6
Dependent Claim
56 words
A magnetic storage device as set forth in claim 2, said curved disk complying arm surfaces being cylindrical and said transducer rounded surface being spherical, the centers of said curved disk complying arm surfaces and the center of said spherical transducer surface being on the same longitudinal center line extending through the center of said transducer.
References Cited (Backward Citations)
US3810243A
Cited
US3867723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |