US4068271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interchangeable magnetic storage element
Assignee: US Philips Corp
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Filing: 1975-11-12
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Granted: 1978-01-10
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Expires: 1995-11-12
Abstract
Abstract An interchangeable random-access magnetic storage element, comprising an electromagnetic disk disposed in a substantially cylindrical dust-proof enclosure, which as an assembly can be fitted onto a drive spindle of a drive means. The enclosure comprises two covers which are clamped against each other with the insertion of dust seals, which together with the magnetic disk are rotated by the drive spindle, the upper cover being axially lifted by lifting cams provided on the drive spindle, so that an annular slot is obtained between the lower and upper cover for the passage of electromagnetic recording and reproducing means. At its top the drive spindle comprises an axially movable pressure member, which upon closure of a cover of the drive means is depressed and thus clamps the electromagnetic disk onto the spindle and simultaneously lifts the upper cover.
Inventors
- 👤 Cornelis Hendrik Kok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:42
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/04; G11B17/041; G11B17/022; G11B17/028; G11B17/03; G11B17/032; G11B23/00; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035; G11B23/02; G11B23/03; G11B23/032; G11B23/0321
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
222 words
An interchangeable random-access magnetic storage element adapted to be fitted onto a drive spindle of a drive means for driving said storage element and comprising: a. a substantially cylindrical dust-proof enclosure with a lower and an upper surface disposed at some distance from each other, b. a single magnetic disk accommodated in the enclosure, which disk is rotatably drivable by the drive means, c. means for positioning the storage element on the drive means, d. a passage through which electromagnetic recording and read means can be passed, e. means for automatically closing the passage each time that the storage element is removed from the drive means, f. means for preventing a rotation of the magnetic disk relative to the enclosure each time that the storage element is removed from the drive means, g. the enclosure comprising lower and upper covers which are axially movable relative to each other, h. the passage for the magnetic recording and read means having an annular slot which is formed upon a relative axial movement between the lower and upper cover, and i. means for preventing a rotation of the magnetic disk relative to the enclosure each time that the storage element is fitted onto the drive means so that the enclosure and the magnetic disk are jointly drivable in a rotatable fashion by the drive means.
Claim 2
Dependent Claim
222 words
An interchangeable random-access magnetic storage element adapted to be fitted onto a drive spindle of a drive means for driving said storage element and comprising: a. a substantially cylindrical dust-proof enclosure with a lower and an upper surface disposed at some distance from each other, b. a single magnetic disk accommodated in the enclosure, which disk is rotatably drivable by the drive means, c. means for positioning the storage element on the drive means, d. a passage through which electromagnetic recording and read means can be passed, e. means for automatically closing the passage each time that the storage element is removed from the drive means, f. means for preventing a rotation of the magnetic disk relative to the enclosure each time that the storage element is removed from the drive means, g. the enclosure comprising lower and upper covers which are axially movable relative to each other, h. the passage for the magnetic recording and read means having an annular slot which is formed upon a relative axial movement between the lower and upper cover, and i. means for preventing a rotation of the magnetic disk relative to the enclosure each time that the storage element is fitted onto the drive means so that the enclosure and the magnetic disk are jointly drivable in a rotatable fashion by the drive means.
Claim 3
Dependent Claim
21 words
A magnetic storage element as claimed in claim 1, characterized in that the covers are identical shells made of a plastic.
Claim 4
Dependent Claim
55 words
A magnetic storage element as claimed in claim 1, characterized in that the covers near their circumference comprise first annular dust seals, which when the enclosure is closed engage with each other, and furthermore nearer their center are provided with second annular dust seals which when the enclosure is closed engage with the magnetic disk.
Claim 5
Dependent Claim
66 words
A magnetic storage element as claimed in claim 1, characterized in that said means for closing the passage for the electromagnetic recording and read means comprise a number of leaf springs which are bent out of their neutral positions, which nearer the center of the storage element are both rigidly connected to the magnetic disk and to a cover and press these covers toward each other.
Claim 6
Dependent Claim
67 words
A magnetic storage element as claimed in claim 1, the magnetic disk comprising a round disk which is provided with a magnetizable coating, which disk is rigidly connected to a hub which is adapted to cooperate with the drive spindle of the drive means, characterized in that the inner surface of the hub which faces the center of the storage element has a substantially continuous cylindrical shape.
Claim 7
Dependent Claim
43 words
In combination with the magnetic storage element of claim 1, a drive spindle which comprises a number of movable clamping members for tightly retaining and thus driving the magnetic disk and a number of movable lifting members for axially lifting the upper cover.
Claim 8
Dependent Claim
91 words
A combination as in claim 6, wherein said drive spindle at its top comprises a pressure member which is axially depressable against spring pressure, which member upon depression moves said clamping members and lifting members, and furthermore the drive means comprises a cover which is movable between an open and a closed position, and a pressure member, the depression of said pressure member being effected by means of parts of the cover which cooperate with the pressure member, when the cover is moved from the open position to the closed position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |