US3872661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Textile apparatus
Assignee: Ernest Scragg and Sons Ltd
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Filing: 1973-09-10
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Granted: 1975-03-25
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Expires: 1993-09-10
Abstract
Abstract In a friction false twisting device of the class comprising a plurality of overlapping rotary discs arranged on parallel axes disposed about a strand path in such manner that a running strand contacts the rim of each disc in turn as it follows a zig-zag spiralling path through the device and is false twisted, one or more of the end discs at the input end of the device, and optionally one or more end discs at the output end, have at least their rim portions of material which has a lesser coefficient of friction with the strand than has the inner discs.
Inventors
- 👤 Ronald Spencer Eaves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:32
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/04; D02G1/08; D02G1/082
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
In a friction false-twisting device, a combination comprising a plurality of parallel equiangularly spaced shafts; and a plurality of sets of rotary discs each having a rim portion, said sets each being mounted on one of said shafts and the discs of each set being spaced axially of the Associated shaft, the discs of all sets overlapping one another and forming a zig-zag spiralling path in which a strand to be false-twisted can travel from an initial to a terminal disc of said plurality with a substantially pure rolling motion over each disc rim portion in succession and at an angle inclined to the plane of rotation of the respective disc, at least the rim portion of at least said initial disc being of material which has a lesser coefficient of friction with the strand than the rim portions of others of said discs.
Claim 2
Dependent Claim
144 words
In a friction false-twisting device, a combination comprising a plurality of parallel equiangularly spaced shafts; and a plurality of sets of rotary discs each having a rim portion, said sets each being mounted on one of said shafts and the discs of each set being spaced axially of the Associated shaft, the discs of all sets overlapping one another and forming a zig-zag spiralling path in which a strand to be false-twisted can travel from an initial to a terminal disc of said plurality with a substantially pure rolling motion over each disc rim portion in succession and at an angle inclined to the plane of rotation of the respective disc, at least the rim portion of at least said initial disc being of material which has a lesser coefficient of friction with the strand than the rim portions of others of said discs.
Claim 3
Dependent Claim
22 words
A combination as defined in claim 1, wherein at least said rim portion of said terminal disc is also of said material.
Claim 4
Dependent Claim
26 words
A combination as defined in claim 1, wherein at least said rim portion of the disc closest to said initial disc is also of said material.
Claim 5
Dependent Claim
26 words
A combination as defined in claim 2, wherein at least said rim portion of the disc closest to said initial disc is also of said material.
Claim 6
Dependent Claim
26 words
A combination as defined in claim 2, wherein at least said rim portion of the disc closest to said terminal disc is also of said material.
Claim 7
Dependent Claim
148 words
In a friction false-twisting device, a combination comprising a plurality of parallel equi-angularly spaced shafts; and a plurality of sets of rotary discs each having a rim portion, said sets each being mounted on one of said shafts and the discs of each set being spaced axially of the associated shaft, the discs of all sets overlapping one another and forming a zig-zag spiralling path in which a strand to be false-twisted can travel from an initial to a terminal disc of said plurality with a substantially pure rolling motion over each disc rim portion in succession and at an angle inclined to the plane of rotation of the respective disc, at least the rim portion of at least one of said initial and terminal discs being of material which has a lesser coefficient of friction with the strand than the rim portion of others of said discs.
Claim 8
Dependent Claim
148 words
In a friction false-twisting device, a combination comprising a plurality of parallel equi-angularly spaced shafts; and a plurality of sets of rotary discs each having a rim portion, said sets each being mounted on one of said shafts and the discs of each set being spaced axially of the associated shaft, the discs of all sets overlapping one another and forming a zig-zag spiralling path in which a strand to be false-twisted can travel from an initial to a terminal disc of said plurality with a substantially pure rolling motion over each disc rim portion in succession and at an angle inclined to the plane of rotation of the respective disc, at least the rim portion of at least one of said initial and terminal discs being of material which has a lesser coefficient of friction with the strand than the rim portion of others of said discs.
Claim 9
Dependent Claim
21 words
A combination as defined in claim 6, wherein said rim portion of said at least one disc is of smooth metal.
Claim 10
Dependent Claim
12 words
A combination as defined in claim 7, wherein said metal is steel.
Claim 11
Dependent Claim
12 words
A combination as defined in claim 7, wherein said metal is aluminum.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |