US3751603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling magnetic head displacement
Assignee: HONEYWELL BULL FR SA
•
Filing: 1972-01-24
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Granted: 1973-08-07
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Expires: 1992-01-24
Abstract
Abstract A device for controlling at least one magnetic head in an apparatus for writing and reading data on and out a magnetic medium. Said device is equipped with a spindle actuating at least one cam cooperating with at least one arm equipped with a spring attached by one of its ends to this arm and by the other end in contact with the magnetic head in such a way as to be capable of bringing said magnetic head near said medium into a position for writing or reading said data, a device for controlling the rotation of said spindle, means for locking the magnetic head in said position and means for releasing the magnetic head, so that it may be moved away from said medium. Said device is utilizable with magnetic disk memories.
Inventors
- 👤 L Prieur
- 👤 H Rousseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:52
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
176 words
In apparatus for reading and writing data on a magnetic medium equipped with at least one magnetic head, a device for controlling the displacement of a head toward the medium, comprising; a rotatable spindle having a wheel mounted thereon having surfaces forming a cam, an arm extending perpendicular to the axis of said spindle, means interconnecting one end of the arm with the magnetic head for movement of the head into, and out of, the read-write position adjacent the medium through rotation of said arm, about its longitudinal means interconnecting the opposite end of said arm with said cam for rotating said arm about said axis, by movement of said cam, spring means attached between said arm and said magnetic head for biasing said head towards a surface of the medium, means for controlling rotation of said spindle means for locking the spindle in position and to thereby lock the magnetic head in the read-write position, and means for releasing the magnetic head by releasing the magnetic head by releasing the spindle from the locked position.
Claim 2
Dependent Claim
176 words
In apparatus for reading and writing data on a magnetic medium equipped with at least one magnetic head, a device for controlling the displacement of a head toward the medium, comprising; a rotatable spindle having a wheel mounted thereon having surfaces forming a cam, an arm extending perpendicular to the axis of said spindle, means interconnecting one end of the arm with the magnetic head for movement of the head into, and out of, the read-write position adjacent the medium through rotation of said arm, about its longitudinal means interconnecting the opposite end of said arm with said cam for rotating said arm about said axis, by movement of said cam, spring means attached between said arm and said magnetic head for biasing said head towards a surface of the medium, means for controlling rotation of said spindle means for locking the spindle in position and to thereby lock the magnetic head in the read-write position, and means for releasing the magnetic head by releasing the magnetic head by releasing the spindle from the locked position.
Claim 3
Dependent Claim
120 words
The apparatus of claim 1 wherein the medium is a magnetic disk having two magnetized surfaces and a second magnetic head, said apparatus further including a second arm extending perpendicular to the axis of said spindle, means interconnecting one end of said second arm with said second magnetic head for movement of the head into and out of the read-write position adjacent the medium through rotation of said arm about its longitudinal axis, means interconnecting the opposite end of said second arm with said cam for rotating said arm about said axis by movement of said cam, and second spring means attached between said second arm and said magnetic head for biasing said head towards a surface of the medium.
Claim 4
Dependent Claim
25 words
The apparatus of claim 1 wherein said spring means is a preloaded spring which combines with said arm to form an elastic and dual-stiffness assembly.
Claim 5
Dependent Claim
44 words
The apparatus of claim 1 wherein said wheel surfaces forming said cam comprise first and second spaced apart and opposed surfaces contacting said cam interconnecting means of said respective first and second arms, symmetrically with relation to the plane of symmetry of said wheel.
Claim 6
Dependent Claim
40 words
The apparatus of claim 1 wherein said wheel is connected to a rigid hub which remains stationary in relation to said spindle and said wheel is of flexible material whereby said cam surfaces are movable in relation to said spindle.
Claim 7
Dependent Claim
29 words
The apparatus of claim 2 wherein each of said spring means is a preloaded spring which combines with its respective arm to form an elastic and dual stiffness assembly.
Claim 8
Dependent Claim
40 words
The apparatus of claim 4 wherein said wheel is connected to a rigid hub which remains stationary in relation to said spindle and said wheel is of flexible material whereby said cam surfaces are movable in relation to said spindle.
Claim 9
Dependent Claim
47 words
The apparatus of claim 1 wherein the means for controlling rotation of said spindle includes gearing means disposed at one end of said spindle and an electromagnet disposed at adjacent said gearing means having an armature effective to actuate said gearing means when said electromagnet is energized.
Claim 10
Dependent Claim
51 words
The apparatus of claim 1 wherein the means for locking said spindle includes a magnetic wafer, a second cam attached to said spindle and, an overlap portion extending from said cam and in rotatable alignment with said wafer whereby rotation of said spindle causes said overlap portion to contact said wafer.
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |