US3879757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data storage mechanism having a flexible magnetic disk
Assignee: International Business Machines Corp
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Filing: 1974-03-01
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Granted: 1975-04-22
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Expires: 1994-03-01
Abstract
Abstract The data storage mechanism employs a thin, flexible disk having magnetic recording surfaces on both sides and disposed in a carrying envelope. The envelope has an elongate slot in both thicknesses to permit magnetic read/write heads to make contact with magnetic disk surfaces. A pair of pressure pads are disposed on both sides of the envelope, laterally and equally spaced from the read/write head on each side of the envelope; and the pads hold the disk substantially fixed in the direction extending axially of the disk. An eccentric carries the read/write heads so as to swing the heads about a propelling screw therefor and cause one or the other of the read/write heads to move into contact with a magnetic surface of the disk.
Inventors
- 👤 James Francis Elliott
- 👤 Joel Swenum Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:24
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/032; G11B17/32; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
221 words
A magnetic storage device comprising a thin flexible magnetic disk, means for rotating said disk, a first pair of spaced pressure pads located at a first face of said disk and a second pair of spaced pressure pads located at the second face of said disk and disposed oppositely with respect to said first pair of pressure pads, means for holding said first and second pairs of pressure pads fixed with respect to each other so that they grip said magnetic disk, a pair of magnetic heads located opposite each other and at opposite faces of said disk and each magnetic head being disposed between said pressure pad at the face of the disk at which the magnetic head is located, a carriage for connecting said magnetic heads together so that they move together, and means for moving said carriage to bring one or the other of said magnetic heads into forceful contact with a face of said disk with the disk being held from movement against the action of the head being moved into contact with a face of the disk by said pair of pressure pads located at the opposite face of said disk whereby these pressure pads hold the disk onto and around said head and whereby the head has a firm data transferring contact with said disk.
Claim 2
Dependent Claim
221 words
A magnetic storage device comprising a thin flexible magnetic disk, means for rotating said disk, a first pair of spaced pressure pads located at a first face of said disk and a second pair of spaced pressure pads located at the second face of said disk and disposed oppositely with respect to said first pair of pressure pads, means for holding said first and second pairs of pressure pads fixed with respect to each other so that they grip said magnetic disk, a pair of magnetic heads located opposite each other and at opposite faces of said disk and each magnetic head being disposed between said pressure pad at the face of the disk at which the magnetic head is located, a carriage for connecting said magnetic heads together so that they move together, and means for moving said carriage to bring one or the other of said magnetic heads into forceful contact with a face of said disk with the disk being held from movement against the action of the head being moved into contact with a face of the disk by said pair of pressure pads located at the opposite face of said disk whereby these pressure pads hold the disk onto and around said head and whereby the head has a firm data transferring contact with said disk.
Claim 3
Dependent Claim
221 words
A magnetic storage device comprising a thin flexible magnetic disk, means for rotating said disk, a first pair of spaced pressure pads located at a first face of said disk and a second pair of spaced pressure pads located at the second face of said disk and disposed oppositely with respect to said first pair of pressure pads, means for holding said first and second pairs of pressure pads fixed with respect to each other so that they grip said magnetic disk, a pair of magnetic heads located opposite each other and at opposite faces of said disk and each magnetic head being disposed between said pressure pad at the face of the disk at which the magnetic head is located, a carriage for connecting said magnetic heads together so that they move together, and means for moving said carriage to bring one or the other of said magnetic heads into forceful contact with a face of said disk with the disk being held from movement against the action of the head being moved into contact with a face of the disk by said pair of pressure pads located at the opposite face of said disk whereby these pressure pads hold the disk onto and around said head and whereby the head has a firm data transferring contact with said disk.
Claim 4
Dependent Claim
221 words
A magnetic storage device comprising a thin flexible magnetic disk, means for rotating said disk, a first pair of spaced pressure pads located at a first face of said disk and a second pair of spaced pressure pads located at the second face of said disk and disposed oppositely with respect to said first pair of pressure pads, means for holding said first and second pairs of pressure pads fixed with respect to each other so that they grip said magnetic disk, a pair of magnetic heads located opposite each other and at opposite faces of said disk and each magnetic head being disposed between said pressure pad at the face of the disk at which the magnetic head is located, a carriage for connecting said magnetic heads together so that they move together, and means for moving said carriage to bring one or the other of said magnetic heads into forceful contact with a face of said disk with the disk being held from movement against the action of the head being moved into contact with a face of the disk by said pair of pressure pads located at the opposite face of said disk whereby these pressure pads hold the disk onto and around said head and whereby the head has a firm data transferring contact with said disk.
Claim 5
Dependent Claim
53 words
A magnetic storage device as set forth in claim 1 and including an envelope encasing said magnetic disk and provided with a slot therethrough on each face of the envelope through which the corresponding one of said magnetic heads may extend for coming into data transferring contact with a face of said disk.
Claim 6
Dependent Claim
86 words
A magnetic storage device as set forth in claim 1 and including a lead screw having a screw threaded engagement with said carriage for carrying said two magnetic heads radially of said disk for causing the heads to be in contact with said disk at various radii as the disk is rotated, said means for moving said carriage including means for swinging the carriage about said lead screw so as to thereby move one or the other of said magnetic heads into contact with said disk.
References Cited (Backward Citations)
US3703713A
Cited
US3731292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |