US4229774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-adapting flow restrictors
Assignee: International Business Machines Corp
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Filing: 1979-01-02
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Granted: 1980-10-21
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Expires: 1999-01-02
Abstract
Abstract A record storage apparatus consisting of a stack of co-rotating spaced apart flexible record storage disks are stabilized by circumferentially uniform radially outwardly flowing air under a quiescent operating condition. The record storage disks are normally in a parallel relationship. To form a transducing access opening, the disks are axially partially moved to create an enlarged interstice between two of the record storage disks for enabling a transducer to reach a recording surface on one of the two record storage disks. Disks adjacent to such access openings come closer together but should not touch. To avoid the touching and maintain stability, air flow between such more closely spaced disks is automatically adjusted as the disks approach each other.
Inventors
- 👤 Donovan M. Janssen
- 👤 Anton J. Radman, Jr.
- 👤 William S. Seaward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:14
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/021
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
The method of operating a record storage apparatus having a plurality of axially spaced apart flexible storage disks with somewhat uniform axial interstices therebetween with transducer access being achieved by axially enlarging one of said axial interstices, the steps of: reducing air flow between storage disks adjacent said transducer accessing enlarged interstice as a function of the axial spacing from said enlarged interstice, the closer the disk interstice is to said enlarged interstice, the greater the reduction of air flow, and adjusting said air flow reductions in accordance with environmental atmospheric conditions.
Claim 2
Independent Claim
92 words
The method of operating a record storage apparatus having a plurality of axially spaced apart flexible storage disks with somewhat uniform axial interstices therebetween with transducer access being achieved by axially enlarging one of said axial interstices, the steps of: reducing air flow between storage disks adjacent said transducer accessing enlarged interstice as a function of the axial spacing from said enlarged interstice, the closer the disk interstice is to said enlarged interstice, the greater the reduction of air flow, and adjusting said air flow reductions in accordance with environmental atmospheric conditions.
Claim 3
Dependent Claim
35 words
The apparatus set forth in claim 1 wherein said radially outwardly extending portion includes a plurality of radially extending circumferentially spaced apart flanges whereby air tends to flow radially at all times between said flanges.
Claim 4
Dependent Claim
200 words
Record storage apparatus having a plurality of axially spaced apart flexible record storage disks mounted on a spindle for corotation, said spindle having a plurality of radial air passageways aligned with spaces between said disks, respectively, such that air flows from said spindle radially past said disks to stabilize same during said corotation, the improvement comprising: said spindle having a plurality of spacer means intermediate respective ones of said disks for determining said axial spacing and each said spacer means having a radially outwardly extending portion extending into a said respective space and being axially spaced from at least one of said disks defining said respective space whereby any axial enlargement of any one of said spaces in axial proximity to said respective space enables said one disk to axially flex along a given circle of said one disk, said given circle having a radius less than a maximal radius of said outwardly extending portion such that said respective spacing containing said spaced outwardly extending portion is further restricted by the relative axial flexure of said one disk with respect to said spaced outwardly extending portion to thereby restrict air flowing into said respective space in accordance with said flexure.
Claim 5
Dependent Claim
200 words
Record storage apparatus having a plurality of axially spaced apart flexible record storage disks mounted on a spindle for corotation, said spindle having a plurality of radial air passageways aligned with spaces between said disks, respectively, such that air flows from said spindle radially past said disks to stabilize same during said corotation, the improvement comprising: said spindle having a plurality of spacer means intermediate respective ones of said disks for determining said axial spacing and each said spacer means having a radially outwardly extending portion extending into a said respective space and being axially spaced from at least one of said disks defining said respective space whereby any axial enlargement of any one of said spaces in axial proximity to said respective space enables said one disk to axially flex along a given circle of said one disk, said given circle having a radius less than a maximal radius of said outwardly extending portion such that said respective spacing containing said spaced outwardly extending portion is further restricted by the relative axial flexure of said one disk with respect to said spaced outwardly extending portion to thereby restrict air flowing into said respective space in accordance with said flexure.
Claim 6
Dependent Claim
33 words
The method set forth in claim 1 further including the steps of adjusting said air flow reduction in accordance with axial flexure of said disks defining each individual ones of said interstices, respectively.
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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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |