Patent US4578726A successfully refreshed from Google Patents.
US4578726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head arm mounting device for one or more scanning heads in recording playback apparatus for disk records
Assignee: BASF SE
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Filing: 1983-02-11
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Granted: 1986-03-25
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Expires: 2003-02-11
Abstract
Abstract A head arm mounting device for one or more scanning heads in recording/playback apparatus for disk records, especially flexible magnetic disks, includes a pivot shaft for the head arm, this shaft being held in a mount, with the aid of spring means, in a manner such that it has no axial play, and producing, in conjunction with the head arm loading spring, a head loading force which is constant and essentially independent of the head arm deflection. The mounting device consists essentially of a mount and a pivot shaft, either of which may be associated with a spring. A one-piece frame-shaped member with an integral spring constitutes an optimum mount. In an advantageous embodiment, means are provided for finely adjusting the force exerted by the head arm loading spring, and for compensating for tolerances in the spring force of the loading spring in the quantity production of disk drive apparatus.
Inventors
- 👤 Udo Boehm
- 👤 Ernst-Juergen Grittmann
- 👤 Klaus Schulze-Berge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B21/00; G11B21/16; G11B5/56
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
157 words
In an apparatus for recording on, and/or playing back from, recording media, especially a flexible recording disks, of the type having a carriage, a head arm which carries a magnetic scanning head, and a suspension system for pivotally mounting said head arm on said carriage including a loading spring for pivotally biasing said head arm, said suspension system comprising a U-shaped mount formed on said carriage, said U-shaped mount having upstanding legs which straddle said head arm and which terminate at respective free ends a pivot shaft about which said head arm is mounted for pivoting movement, said shaft having respective ends supported by said legs at intermediate points on said legs, and tension spring means integrally formed with the U-shaped mount to span between the free ends of said legs for resiliently urging said legs toward the ends of said shaft so as to eliminate axial plat of said shaft in the operation of said apparatus.
Claim 2
Dependent Claim
157 words
In an apparatus for recording on, and/or playing back from, recording media, especially a flexible recording disks, of the type having a carriage, a head arm which carries a magnetic scanning head, and a suspension system for pivotally mounting said head arm on said carriage including a loading spring for pivotally biasing said head arm, said suspension system comprising a U-shaped mount formed on said carriage, said U-shaped mount having upstanding legs which straddle said head arm and which terminate at respective free ends a pivot shaft about which said head arm is mounted for pivoting movement, said shaft having respective ends supported by said legs at intermediate points on said legs, and tension spring means integrally formed with the U-shaped mount to span between the free ends of said legs for resiliently urging said legs toward the ends of said shaft so as to eliminate axial plat of said shaft in the operation of said apparatus.
Claim 3
Dependent Claim
18 words
A suspension system as claimed in claim 1, wherein said integrally formed spring means is of meander shape.
Claim 4
Dependent Claim
37 words
A suspension system as claimed in claim 1, wherein said tension spring means is dimensioned so that the axial force exerted by said legs on said pivot shaft is between 0.5 and 2.0 kilopond, preferably 0.8 kilopond.
Claim 5
Dependent Claim
64 words
a suspension system as claimed in claim 1, wherein the loading spring is dimensioned so that the loading spring, together with the remainder of the suspension system as well as with the head arm and the head, exhibits a spring characteristic such that the loading force applied by the head on the recording media is substantially independent of the pivotal deflection of the head.
Claim 6
Dependent Claim
25 words
A suspension system as claimed in claim 4, in which the spring characteristic varies at most by approximately ±20% from the spring characteristic when horizontal.
Claim 7
Dependent Claim
36 words
A suspension system as claimed in claim 1, wherein the loading spring is a torsion spring one of whose ends is connected with the carriage by way of an adjustment device for varying the loading force.
Claim 8
Dependent Claim
30 words
A suspension system as claimed in claim 6, wherein the adjustment device is in the form of a rotatably mounted stepping disk having a plurality of steps, preferably four steps.
Claim 9
Dependent Claim
27 words
A suspension system as claimed in claim 6, wherein the adjustment device is in the form of a rotatably mounted disk having a continually rising inclined surface.
Claim 10
Dependent Claim
22 words
A suspension system as claimed in claim 6, wherein the adjustment device is in the form of a vertically displaceable headless screw.
Claim 11
Dependent Claim
22 words
A suspension system as claimed in claim 6, wherein the adjustment device is in the form of a longitudinally displaceable wedge-shaped member.
Claim 12
Dependent Claim
18 words
A suspension system as claimed in claim 6, wherein the adjustment device is made of a plastics material.
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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) | 1989-03-24 | 1989-09-23 | 1990-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-24 | 1993-09-23 | 1994-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-24 | 1997-09-23 | 1998-03-25 | $7700.00 | Window Closed / Lapsed |