US3799630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Textile spinning machines
Assignee: Hollingsworth UK Ltd
•
Filing: 1972-11-14
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Granted: 1974-03-26
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Expires: 1992-11-14
Abstract
Abstract An open end spinning unit having a spinning rotor carried on one end of a driven shaft, which shaft is mounted for rotation in at least one flexibly mounted gas bearing, includes a double acting thrust bearing for limiting axial movement of the shaft in either direction. The thrust bearing comprises a first thrust element which is fixed on and rotates with the shaft and presents a first thrust surface, and a second thrust element presenting a second thrust surface opposite to and for cooperation with the first thrust surface, the second thrust element being resiliently mounted. Means are provided for introducing a gas between the said thrust surfaces, the said thrust elements being arranged in a chamber so that gas escaping from between the thrust surfaces enters the chamber and acts on that face of the first thrust element opposite to the face presenting the first thrust surface.
Inventors
- 👤 A Chisholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:51
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/06; F16C32/0681; F16C32/0692; D; D01; D01H; D01H4/00; D01H4/04; D01H4/08; D01H4/12; F16C2340/00; F16C2340/18
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
173 words
An open end spinning unit including a shaft, at least one flexibly mounted gas bearing in which the shaft is mounted for rotation, a drive means for driving the shaft, a spinning rotor carried on one end of the shaft and rotatable therewith, and a thrust bearing for limiting axial movement of the shaft, wherein the thrust bearing comprises a first thrust element which is fixed to the shaft such that it is rotatable therewith and which presents a first thrust surface, a second thrust element presenting a second thrust surface in opposition to and for cooperating with the first thrust surface, the second thrust element being resiliently mounted, means for introducing a gas between the thrust surfaces to form a gap between them, and a thrust bearing chamber, the first and second thrust elements being arranged in said chamber so that in operation gas escaping from between the thrust surfaces enters the chamber and acts on an opposite face of the first thrust element to that face presenting the first thrust surface.
Claim 2
Dependent Claim
173 words
An open end spinning unit including a shaft, at least one flexibly mounted gas bearing in which the shaft is mounted for rotation, a drive means for driving the shaft, a spinning rotor carried on one end of the shaft and rotatable therewith, and a thrust bearing for limiting axial movement of the shaft, wherein the thrust bearing comprises a first thrust element which is fixed to the shaft such that it is rotatable therewith and which presents a first thrust surface, a second thrust element presenting a second thrust surface in opposition to and for cooperating with the first thrust surface, the second thrust element being resiliently mounted, means for introducing a gas between the thrust surfaces to form a gap between them, and a thrust bearing chamber, the first and second thrust elements being arranged in said chamber so that in operation gas escaping from between the thrust surfaces enters the chamber and acts on an opposite face of the first thrust element to that face presenting the first thrust surface.
Claim 3
Dependent Claim
34 words
An open end spinning unit as claimed in claim 1 wherein the unit is mounted with the axis of the shaft inclined to the horizontal with the spinning rotor lower than the thrust bearing.
Claim 4
Dependent Claim
23 words
An open end spinning unit as claimed in claim 2 wherein the axis of the shaft is inclined at 25* to the horizontal.
Claim 5
Dependent Claim
57 words
An open end spinning unit as claimed in claim 1, wherein the second thrust element is annular and wherein the said other end of the shaft extends through the second thrust element with a clearance between the shaft and the second thrust element, the first thrust element being secured to the said other end of the shaft.
Claim 6
Dependent Claim
16 words
An open end spinning unit as claimed in claim 1 wherein the thrust surfaces are annular.
Claim 7
Dependent Claim
93 words
An open end spinning unit as claimed in claim 1 wherein the thrust chamber communicates with atmosphere via a narrow orifice whereby, in operation, a flow of gas from between the thrust surfaces into the chamber and through the orifice to atmosphere is allowed, the resistance to flow offered by the orifice being such that the pressure of the gas in the chamber, acting on the said opposite face of the first thrust element is greater than atmospheric pressure, and is dependent on the quantity of gas escaping from between the thrust surfAces.
Claim 8
Dependent Claim
43 words
An open end spinning unit as claimed in claim 1 wherein the second thrust element is resiliently mounted on a stationary housing by means of a resilient ring, and whereby the second thrust element is incapable of rotation but capable of tilting movement.
Claim 9
Dependent Claim
47 words
An open end spinning unit as claimed in claim 7 wherein an opposite face of the second thrust element to that presenting the second thrust surface is provided with an annular seating, the resilient ring being accommodated between the annular seating and a seating on the housing.
Claim 10
Dependent Claim
42 words
An open end spinning unit as claimed in claim 1 wherein the second thrust element is resiliently mounted on a stationary housing by means of a resilient diaphragm whereby the second thrust element is incapable of rotation but capable of tilting movement.
Claim 11
Dependent Claim
45 words
An open end spinning unit as claimed in claim 9 wherein the diaphragm is a thin deformable disc and is connected both to an opposite face of the second thrust element to that presenting the second thrust face and the housing for the thrust element.
Claim 12
Dependent Claim
39 words
An open end spinning unit as claimed in claim 9 wherein the diaphragm is connected between an outer edge on the second thrust element and the housing and comprises a ring of elastomeric material or densely compacted crimped wire.
Claim 13
Dependent Claim
54 words
An open end spinning unit as claimed in claim 1 wherein the means for introducing gas between the thrust surfaces includes a cavity in the second thrust element and a number of ducts connecting the cavity with the gap between the thrust surfaces whereby compressed gas supplied to the cavity passes to the gap.
Claim 14
Dependent Claim
17 words
An open end spinning unit as claimed in claim 12 wherein the cavity is an annular chamber
Claim 15
Dependent Claim
34 words
An open end spinning unit as claimed in claim 13 including a stationary gas inlet for connection to a supply of compressed gas, and a flexible tube connecting the gas inlet to the cavity.
Claim 16
Dependent Claim
65 words
An open end spinning unit as clained in claim 4 wherein the means for introducing gas between the thrust surfaces, includes spiral grooves formed in one of the thrust surfaces, the grooves acting, in operation, to exert a pumping action across the thrust surfaces to draw gas into the gap between the thrust surfaces via the clearance between the shaft and the second thrust element.
Claim 17
Dependent Claim
69 words
An open end spinning unit as claimed in claim 15 including a stationary housing for the unit and a passage in the stationary housing for connection to a supply of compressed gas, the passage communicating with the said clearance between the shaft and the second thrust element, whereby to allow compressed gas to be supplied via the passage and the said clearance to the gap between the thrust surfaces.
Claim 18
Dependent Claim
21 words
An open end spinning unit as claimed in claim 1 wherein the shaft is supported in two flexibly mounted gas bearings.
Claim 19
Dependent Claim
15 words
An open end spinning unit as claimed in claim 1 wherein the gas is air.
References Cited (Backward Citations)
US2951729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |