US3867725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating head apparatus including a thrust gas bearing
Assignee: International Business Machines Corp
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Filing: 1973-10-01
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Granted: 1975-02-18
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Expires: 1993-10-01
Abstract
Abstract Two spacially cooperating rotary transformer windings are supported with accurate mechanical separation by a thrust gas bearing having a fixed position hydrostatic gas bearing member and a movable piston which integrally carries a movable hydrostatic gas bearing member. One transformer winding is carried by the fixed bearing member. The other cooperating transformer winding is supported by a headwheel. This headwheel is air bearing supported by the opposing forces supplied by the fixed and the movable bearing members, respectively. Dimensional manufacturing and operating tolerance is accomodated by movement of the piston, to thereby accurately maintain a desired mechanical spacing between the two transformer windings.
Inventors
- 👤 Donovan M Janssen
- 👤 David Stedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:16
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/53; F; F16; F16C; F16C32/00; F16C32/06; F16C32/0603; F16C32/0681; F16C32/0692; G11B5/127; G11B5/17
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
A rotating head apparatus, comprising: first and second mandrel halves mounted in axial alignment and defining an annular cavity at the joint site thereof, first annular rotary transformer means mounted at a fixed position in one radially extending wall of said cavity and concentric with the axis of said mandrel, first annular hydrostatic gas bearing means mounted at a fixed position in said one cavity wall, an axially movable piston forming the opposite axially extending wall of said cavity, second annular hydrostatic gas bearing means carried by said piston in said opposite cavity wall, a pressurized plenum movably supporting said piston and supplying gas under pressure to said second bearing means, and an annular head wheel supported in said cavity by said gas bearing means and carrying second annular rotary transformer means on a surface thereof which confronts said first bearing means.
Claim 2
Dependent Claim
142 words
A rotating head apparatus, comprising: first and second mandrel halves mounted in axial alignment and defining an annular cavity at the joint site thereof, first annular rotary transformer means mounted at a fixed position in one radially extending wall of said cavity and concentric with the axis of said mandrel, first annular hydrostatic gas bearing means mounted at a fixed position in said one cavity wall, an axially movable piston forming the opposite axially extending wall of said cavity, second annular hydrostatic gas bearing means carried by said piston in said opposite cavity wall, a pressurized plenum movably supporting said piston and supplying gas under pressure to said second bearing means, and an annular head wheel supported in said cavity by said gas bearing means and carrying second annular rotary transformer means on a surface thereof which confronts said first bearing means.
Claim 3
Dependent Claim
30 words
The rotating head apparatus defined in claim 1, including further gas bearing means carried by an axially extending wall of said cavity and operating to radially support said head wheel.
Claim 4
Dependent Claim
106 words
The rotating head apparatus defined in claim 2 wherein said first bearing means is supplied with gas under pressure calculated to establish a given bearing force against the adjacent wall of said head wheel with a known spacing between said first and second transformer means, wherein said plenum is supplied with gas under pressure calculated to establish said given bearing force against an opposite wall of said head wheel, and wherein said plenum pressure is additionally operative to axially move said piston to an operative posiTion whereat said head wheel and its integral transformer means are spaced from said first bearing means by said known spacing.
Claim 5
Dependent Claim
179 words
Gas bearing supported headwheel recording apparatus comprising: a fixed position gas bearing member supplying a gas under pressure to a bearing surface thereof, a first transducing element mounted on said bearing surface, a compliantly mounted and movable headwheel including a second transducing element mounted on a headwheel surface which is adjacent said bearing surface, said headwheel surface thereby being subjected to a gas bearing force originating from said fixed position gas bearing member, a fixed position gas pressurized plenum mounted on the opposite side of said headwheel from said fixed position gas bearing member, a movable piston mounted within said plenum, and subject to the pressure therein, and a movable gas bearing surface integrally carried by said piston and supplied with gas under pressure from said plenum, said movable gas bearing surface supplying a gas bearing force to said headwheel in a direction to oppose the force originating from said fixed position gas bearing member, whereby accurate mechanical spacing of said first and second transducing elements is maintained by movement of said piston and its integral gas bearing surface.
Claim 6
Dependent Claim
179 words
Gas bearing supported headwheel recording apparatus comprising: a fixed position gas bearing member supplying a gas under pressure to a bearing surface thereof, a first transducing element mounted on said bearing surface, a compliantly mounted and movable headwheel including a second transducing element mounted on a headwheel surface which is adjacent said bearing surface, said headwheel surface thereby being subjected to a gas bearing force originating from said fixed position gas bearing member, a fixed position gas pressurized plenum mounted on the opposite side of said headwheel from said fixed position gas bearing member, a movable piston mounted within said plenum, and subject to the pressure therein, and a movable gas bearing surface integrally carried by said piston and supplied with gas under pressure from said plenum, said movable gas bearing surface supplying a gas bearing force to said headwheel in a direction to oppose the force originating from said fixed position gas bearing member, whereby accurate mechanical spacing of said first and second transducing elements is maintained by movement of said piston and its integral gas bearing surface.
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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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |