Patent US2381446A successfully refreshed from Google Patents.
Patent US4175275A successfully refreshed from Google Patents.
US4175275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
R/W Arm that prevents catastrophic failure
Assignee: International Business Machines Corp
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Filing: 1978-05-22
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Granted: 1979-11-20
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Expires: 1998-05-22
Abstract
Abstract In a flexible magnetic disk file having one or more flexible disks mounted for rotation about a centrally located axis, data on a selected disk is transduced by a magnetic head seated on a fail-safe head arm support. The head arm support is a relatively flat elongated member mounted at one end to a carriage assembly. The head arm support has a smooth contour with relatively sharp edges about its periphery and a spherical enclosure seated on its free end. The head arm support is tapered, at a predetermined angle from the rigidly mounted end towards the free end. The angle of taper allows for automatic ejection of the head arm support from the disk file during inadvertent closure of the disk file. The relatively sharp edges allow the head arm support to open a closed disk file.
Inventors
- 👤 Donald W. Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/16; G11B5/00; G11B5/48; G11B5/4806; G11B5/4833; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
In a disk storage file including a plurality of flexible disks mounted for rotation about a central axis and a positioning mechanism which positions a transducer into a pack opening along a radial line transverse to circumferential data tracks to read and/or write data formed in the data tracks on a surface of the flexible disks, an improved head support arm for the transducer comprising, in combination, a relatively thin and planar member elongated along said radial line having a closed, continuous and uniformly tapered relatively sharp edge contour formed about a majority portion of its periphery including a front edge, a leading edge and a trailing edge which are symmetrically disposed and inclined at an angle with respect to said radial line with an apex formed by said leading and trailing edges preceding the front edge, said angle and edges cooperating to eject the head support arm automatically from within the magnetic disk pack in the event the pack opening in the flexible rotating disks dissipates.
Claim 2
Dependent Claim
167 words
In a disk storage file including a plurality of flexible disks mounted for rotation about a central axis and a positioning mechanism which positions a transducer into a pack opening along a radial line transverse to circumferential data tracks to read and/or write data formed in the data tracks on a surface of the flexible disks, an improved head support arm for the transducer comprising, in combination, a relatively thin and planar member elongated along said radial line having a closed, continuous and uniformly tapered relatively sharp edge contour formed about a majority portion of its periphery including a front edge, a leading edge and a trailing edge which are symmetrically disposed and inclined at an angle with respect to said radial line with an apex formed by said leading and trailing edges preceding the front edge, said angle and edges cooperating to eject the head support arm automatically from within the magnetic disk pack in the event the pack opening in the flexible rotating disks dissipates.
Claim 3
Dependent Claim
16 words
The device as claimed in claim 1 wherein the sharp edge has a double tapered cross-section.
Claim 4
Dependent Claim
17 words
The device as claimed in claim 1 wherein the sharp edge is formed with a concave cross-section.
Claim 5
Dependent Claim
17 words
The device as claimed in claim 1 wherein the sharp edge is formed by a convex cross-section.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-19 | 1983-05-21 | 1983-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-19 | 1987-05-21 | 1987-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-19 | 1991-05-21 | 1991-11-20 | $7700.00 | Window Closed / Lapsed |