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US4242858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open-end spinning device
Assignee: BBC BROWN BOVERI & Co Ltd
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Filing: 1978-09-06
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Granted: 1981-01-06
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Expires: 1998-09-06
Abstract
Abstract An open-end spinning device is disclosed including a spinning rotor which is provided in a spinning-compartment housing having reduced pressure. The spinning-compartment housing has contours which correspond to the surface of the spinning rotor, with the distance between the spinning rotor and the spinning-compartment housing being relatively short. Upon rotation of the spinning rotor, the air clinging to the surface of the spinning rotor is set in motion as a result of boundary-layer friction. Because of the resulting centrifugal force and because of the short distance between the surface of the spinning rotor and the spinning-compartment housing, a stream of air is produced in the direction of the back of the spinning rotor.
Inventors
- 👤 Yuan-Heng Dschen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:34
CPC Classifications
D; D01; D01H; D01H4/00; D01H4/04; D01H4/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
An open-end spinning device, comprising: a spinning rotor having a frustoconical shape; a toroidal intermediate member arranged closely beneath the spinning rotor; a spinning compartment housing, the spinning rotor being closely received within the spinning compartment housing with the spinning compartment housing, the spinning rotor and the toriodal intermediate member together defining a first flow path extending between the frustoconical spinning rotor and the spinning compartment housing in a direction of increasing radius of the spinning rotor and then between a radial outer surface of the toroidal intermediate member and the spinning compartment housing, and with a pressure differential being provided across the first flow path during rotation of the rotor; and means for rotating the spinning rotor.
Claim 2
Dependent Claim
118 words
An open-end spinning device, comprising: a spinning rotor having a frustoconical shape; a toroidal intermediate member arranged closely beneath the spinning rotor; a spinning compartment housing, the spinning rotor being closely received within the spinning compartment housing with the spinning compartment housing, the spinning rotor and the toriodal intermediate member together defining a first flow path extending between the frustoconical spinning rotor and the spinning compartment housing in a direction of increasing radius of the spinning rotor and then between a radial outer surface of the toroidal intermediate member and the spinning compartment housing, and with a pressure differential being provided across the first flow path during rotation of the rotor; and means for rotating the spinning rotor.
Claim 3
Dependent Claim
26 words
The device of claim 1 wherein the pressure drop is the result of boundary-layer friction of air between the spinning rotor and the spinning compartment housing.
Claim 4
Dependent Claim
21 words
The device of claim 1 wherein the spinning compartment housing is substantially closed at one end by a front cover member.
Claim 5
Dependent Claim
32 words
The device of claim 1 wherein an outer surface of the spinning rotor is located between about 0.5 mm to 3 mm away from an inner surface of the spinning compartment housing.
Claim 6
Dependent Claim
37 words
The device of claim 1, wherein the toroidal intermediate member cooperates with the spinning compartment housing to form an air outlet for the spinning rotor with the air flow through the first flow path being substantially turbulence-free.
Claim 7
Dependent Claim
20 words
The device of claim 5 wherein the air outlet diffuses an air stream produced by rotation of the spinning rotor.
Claim 8
Dependent Claim
62 words
The device of claim 5 wherein: the means for rotating the spinning rotor includes an electric motor; and, further comprising: air passageway means for supplying ambient air to a space between the spinning rotor and the toroidal intermediate member, the air passageway means including at least one passageway extending axially of the electric motor and in communication with the first flow path.
Claim 9
Dependent Claim
22 words
The device of claim 1 further comprising a front wall member, the spinning compartment being hingedly received by the front wall member.
Claim 10
Dependent Claim
135 words
An open-end spinning device, comprising: a spinning rotor which is frustoconical in shape; a spinning compartment housing, including a front cover, the spinning rotor being closely received within the spinning compartment housing so that a stream of air, generated by boundary layer friction on the surface of the spinning rotor during rotation of the rotor, is produced; a toroidal intermediate member arranged closely beneath the spinning rotor with a radially outward surface of the toroidal intermediate member and an inner surface of the spinning compartment housing together forming an air discharge opening which permits a substantially non-turbulent exhaust of said air; and electric motor means for rotating the spinning rotor, said motor means having at least one axial air passageway communicating with a discharge passageway defined between the spinning rotor and the toroidal intermediate member.
Claim 11
Dependent Claim
135 words
An open-end spinning device, comprising: a spinning rotor which is frustoconical in shape; a spinning compartment housing, including a front cover, the spinning rotor being closely received within the spinning compartment housing so that a stream of air, generated by boundary layer friction on the surface of the spinning rotor during rotation of the rotor, is produced; a toroidal intermediate member arranged closely beneath the spinning rotor with a radially outward surface of the toroidal intermediate member and an inner surface of the spinning compartment housing together forming an air discharge opening which permits a substantially non-turbulent exhaust of said air; and electric motor means for rotating the spinning rotor, said motor means having at least one axial air passageway communicating with a discharge passageway defined between the spinning rotor and the toroidal intermediate member.
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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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |