Patent US882682A successfully refreshed from Google Patents.
Patent US3875732A successfully refreshed from Google Patents.
US3875732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Textile machines
Assignee: Hollingsworth UK Ltd
•
Filing: 1974-03-14
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Granted: 1975-04-08
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Expires: 1994-03-14
Abstract
Abstract An open end spinning unit including a shaft which is rotatably supported in two gas bearings arranged in spaced relation therealong, a spinning rotor carried on one end of the shaft and rotatable therewith, and a thrust bearing arrangement for limiting axial movement of the shaft, said thrust bearing arrangement being situated between the two gas bearings and comprising a first thrust element which is so fixed to the shaft that it is rotatable therewith and which presents a first thrust surface and a second thrust element presenting a second thrust surface in opposition to, and for cooperation with, the first thrust surface, and the arrangement being such that in operation a gap is maintained between the surfaces by the generation of a film of pressurised gas therebetween.
Inventors
- 👤 Bruce Ellingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:18
CPC Classifications
D; D01; D01H; D01H4/00; D01H4/04; D01H4/08; D01H4/12; D01H4/14
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
128 words
An open end spinning unit including a shaft which is rotatably supported in two gas bearings arranged in spaced relation therealong, a spinning rotor carried on one end of the shaft and rotatable therewith, and a thrust bearing arrangement for limiting axial movement of the shaft, said thrust bearing arrangement being situated between the two gas bearings and comprising a first thrust element which is so fixed to the shaft that it is rotatable therewith and which presents a first thrust surface and a second thrust surface presenting a second thrust surface in opposition to, and for co-operation with, the first thrust surface, and the arrangement being such that in operation a gap is maintained between the surfaces by the generation of a film of pressurised gas therebetween.
Claim 2
Dependent Claim
128 words
An open end spinning unit including a shaft which is rotatably supported in two gas bearings arranged in spaced relation therealong, a spinning rotor carried on one end of the shaft and rotatable therewith, and a thrust bearing arrangement for limiting axial movement of the shaft, said thrust bearing arrangement being situated between the two gas bearings and comprising a first thrust element which is so fixed to the shaft that it is rotatable therewith and which presents a first thrust surface and a second thrust surface presenting a second thrust surface in opposition to, and for co-operation with, the first thrust surface, and the arrangement being such that in operation a gap is maintained between the surfaces by the generation of a film of pressurised gas therebetween.
Claim 3
Dependent Claim
32 words
A unit according to claim 1, wherein the shaft is arranged to be rotated by an electric motor, the rotor of which is fixedly mounted on the shaft between the gas bearings.
Claim 4
Dependent Claim
22 words
A unit according to claim 2, wherein the thrust bearing is situated between the motor rotor and one of the gas bearings.
Claim 5
Dependent Claim
24 words
A unit according to claim 3, wherein the thrust bearing is situated between the motor rotor and the gas bearing adjacent the spinning rotor.
Claim 6
Dependent Claim
25 words
A unit according to claim 3, wherein said thrust bearing is situated between the motor rotor and the gas bearing remote from the spinning rotor.
Claim 7
Dependent Claim
26 words
A unit according to claim 3, including pressurised air supply means for supplying pressurised air to the gap between the said first and second thrust surfaces.
Claim 8
Dependent Claim
52 words
A unit according to claim 6, including a housing for housing the thrust bearing and so supplied with pressurised air as to exert thrust on the thrust bearing arrangement such as to oppose axial movement of the shaft in a direction to open the gap between said first and second thrust surfaces.
Claim 9
Dependent Claim
33 words
A unit according to claim 7, wherein the housing is arranged to be supplied with pressurised air by the escape of pressurised air from the gap between the first and second thrust surfaces.
Claim 10
Dependent Claim
24 words
A unit according to claim 7 wherein the housing is arranged to be supplied with pressurised air from an external supply of pressurised air.
Claim 11
Dependent Claim
15 words
A unit according to claim 7 wherein the said housing houses the two gas bearings.
Claim 12
Dependent Claim
65 words
A unit according to claim 10, wherein the end of the shaft remote from the spinning rotor terminates within the housing and wherein the pressurised air supplied to the interior of the housing is so directed to the last-mentioned end of the shaft as further to provide a thrust on the shaft opposing the opening of the gap between the first and second thrust surfaces.
Claim 13
Dependent Claim
23 words
A unit according to claim 10 wherein the housing houses the electric motor, the stator of which is stationarily mounted within the housing.
Claim 14
Dependent Claim
68 words
A unit according to claim 7 wherein said housing is formed by a cylindrical casing open at each end, a first cover plate closing one end of the casing and housing one of the gas bearings and a second cover plate closing the other end of the casing and a second cover plate closing the other end of the casing and housing the other of the gas bearings.
Claim 15
Dependent Claim
19 words
A unit according to claim 1 wherein the second thrust element of the thrust bearing arrangement is stationarily arranged.
Claim 16
Dependent Claim
41 words
A unit according to claim 1 wherein one of the first and second thrust elements is formed in the thrust surface thereof with a spiral groove or grooves so arranged as in operation to generate said film of pressurised air therebetween.
Claim 17
Dependent Claim
19 words
A unit according to claim 15, wherein said second thrust element is formed with said spiral groove or grooves.
Claim 18
Dependent Claim
14 words
A unit according to claim 1 wherein said second thrust element is resiliently mounted.
Claim 19
Dependent Claim
14 words
A unit according to claim 1 wherein said gas bearings are aerodynamic gas bearings.
Claim 20
Dependent Claim
42 words
A unit according to claim 1 wherein a further thrust bearing arrangement is situated on the side of the motor rotor opposite that on which the first-mentioned thrust bearing arrangement is situated and between the motor rotor and the other gas bearing.
Claim 21
Dependent Claim
90 words
A unit according to claim 19, wherein the further thrust bearing arrangement comprises a first thrust element which is so fixed to the shaft that it is rotatable therewith and which presents a first thrust surface and a second thrust element presenting a second thrust surface in opposition to and for cooperation with the first thrust surface, and wherein the arrangement is such that in operation a gap is maintained between the thrust surfaces of the further thrust bearing arrangement by the generation of a film of pressurised gas therebetween.
Claim 22
Dependent Claim
31 words
A unit according to claim 20, wherein the film of pressurised gas between the thrust surfaces of the further thrust bearing arrangement is generated by air from the adjacent gas bearing.
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |