US4229404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for drawing yarn
Assignee: BP Corp North America Inc
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Filing: 1978-04-28
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Granted: 1980-10-21
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Expires: 1998-04-28
Abstract
Abstract A plurality of yarns are drawn from supply sources onto feed rolls and over a set of draw rolls in adjacent relationship. The yarns are urged into a desired contiguous relationship on the draw rolls by a concave guide surface in the course of passing from the yarn feed rolls to the draw rolls.
Inventors
- 👤 Charles S. Hatcher
- 👤 Kenneth E. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:31
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
A method for cold drawing a plurality of yarns comprising: (a) withdrawing said yarns from an equal number of supply sources by winding said yarns about driven feed roll means in parallel spaced relationship with one another and in a predetermined order; (b) advancing said yarns in a single, normal plane determined by the surface of said feed roll means and in said predetermined order; (c) urging said yarns into a concave arc whose tangent at the midpoint of said arc forms an angle of approximately 45° with said normal plane, whereby said yarns are urged into substantial contiguous side-by-side relationship and maintained in said predetermined order; and (d) stretching said yarns by winding said yarns about draw roll means, driven at a speed greater than the speed of said feed roll means, in said contiguous side-by-side relationship and in said predetermined order.
Claim 2
Independent Claim
143 words
A method for cold drawing a plurality of yarns comprising: (a) withdrawing said yarns from an equal number of supply sources by winding said yarns about driven feed roll means in parallel spaced relationship with one another and in a predetermined order; (b) advancing said yarns in a single, normal plane determined by the surface of said feed roll means and in said predetermined order; (c) urging said yarns into a concave arc whose tangent at the midpoint of said arc forms an angle of approximately 45° with said normal plane, whereby said yarns are urged into substantial contiguous side-by-side relationship and maintained in said predetermined order; and (d) stretching said yarns by winding said yarns about draw roll means, driven at a speed greater than the speed of said feed roll means, in said contiguous side-by-side relationship and in said predetermined order.
Claim 3
Dependent Claim
36 words
A method in accordance with claim 1 wherein the yarns are displaced toward the axes of the feed roll means and the draw roll means simultaneously with the urging of the yarns into a concave arc.
Claim 4
Dependent Claim
32 words
A method in accordance with claim 2 wherein the displacement of the yarns toward the axes of the feed roll means and the draw roll means is less than about one inch.
Claim 5
Dependent Claim
29 words
A method in accordance with claim 1 wherein the yarns are urged into a concave arc by contacting said yarns with an elongated roller concavely curved along its length.
Claim 6
Dependent Claim
36 words
A method in accordance with claim 4 wherein the concavity of the elongated roller is formed along a radius of approximately one and one-half inches disposed in the plane of the longitudinal axis of said roller.
Claim 7
Dependent Claim
58 words
A method in accordance with claim 1 wherein the yarns are drawn from the supply sources by passing the yarns over at least one guide roller means to thereby arrange the yarns in parallel spaced relationship with one another and in a predetermined order in a second plane prior to winding said yarns about the feed roll means.
Claim 8
Dependent Claim
19 words
A method in accordance with claim 6 wherein the first mentioned normal plane and the second plane are coincident.
Claim 9
Dependent Claim
18 words
A method in accordance with claim 1 wherein the drawn yarns are entangled to produce a single yarn.
References Cited (Backward Citations)
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US3439394A
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US3460336A
Cited
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Cited
US3711898A
Cited
US3780516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |