US3685474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making side-fastener stringers
Assignee: Opti Holding AG
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Filing: 1970-10-20
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Granted: 1972-08-22
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Expires: 1990-10-20
Abstract
Abstract A pair of parallel tapes are simultaneously knit on a warpknitting machine with a connecting filament joining their confronting edges. Each tape is formed by a plurality of warp chains laterally interconnected by laid-in weft filaments which span at least three of the wales formed by the chains. The continuous coupling elements are each connected to one of the confronting edges, and the connecting filament is broken either after or immediately before the attaching operation. This connecting filament can be tensioned to be tighter than either the warp or weft filaments to form openings in the tapes adjacent the edge wale. The stitching can pass through these openings, or the coupling heads of the elements can be pushed therethrough. Cutting of this tensioned filament after attachment of the coupling elements substantially closes the openings and causes the tape edge to fold back over the stitching or coupling-turn bights.
Inventors
- 👤 Alfons Frohlich
- 👤 Marie-Luise Cappel
- 👤 Ernst Stubiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:45
CPC Classifications
D; D04; D04B; D04B21/00; D04B21/14; D04B21/16; A; A44; A44B; A44B19/00; A44B19/24; A44B19/34; A44B19/343; A44B19/40; A44B19/406; A44B19/42; A44B19/52; A44B19/54; Y; Y10; Y10T; Y10T24/00; Y10T24/25; Y10T24/2518; Y10T24/2521; Y10T29/00; Y10T29/49; Y10T29/49782; Y10T29/49785
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
A method of making a slide-fastener stringer, comprising the steps of: simultaneously knitting a pair of parallel fabric tapes joined together at confronting edges during knitting by a connecting filament bridging at least respective edge-wales knit along the confronting longitudinal edges of the tapes; drawing said edge-wales together to bunch the thread of said edge-wales and increase the space between each edge-wale and an adjoining wale of a respective tape, the said space of each tape being bridged by transverse threads along respective knit courses defining openings between them along the respective space; stitching respective coupling elements having continuous chains of coupling heads along each of said longitudinal edges of said tapes by passing the fastening stitches through said openings; and removing said connecting filament, thereby separating said tapes.
Claim 2
Independent Claim
129 words
A method of making a slide-fastener stringer, comprising the steps of: simultaneously knitting a pair of parallel fabric tapes joined together at confronting edges during knitting by a connecting filament bridging at least respective edge-wales knit along the confronting longitudinal edges of the tapes; drawing said edge-wales together to bunch the thread of said edge-wales and increase the space between each edge-wale and an adjoining wale of a respective tape, the said space of each tape being bridged by transverse threads along respective knit courses defining openings between them along the respective space; stitching respective coupling elements having continuous chains of coupling heads along each of said longitudinal edges of said tapes by passing the fastening stitches through said openings; and removing said connecting filament, thereby separating said tapes.
Claim 3
Dependent Claim
56 words
The method defined in claim 1 wherein said tapes are warp-knit by the steps of forming a plurality of longitudinally extending wale-forming warp chains from a plurality of warp filaments, and laying into said chains a plurality of course-forming weft filaments with at least some of said weft filaments being drawn across at least three wales.
Claim 4
Dependent Claim
18 words
The method defined in claim 2 wherein said tapes are separated by the step of cutting said filament.
Claim 5
Dependent Claim
50 words
The method defined in claim 3 wherein four such tapes are knitted simultaneously in interconnected relationship with three connecting filaments joining the tapes together, said method further comprising the step of cutting the central connecting filament whereupon coupling elements are secured to the two pairs of tapes remaining joined together.
References Cited (Backward Citations)
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US2433279A
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US2652705A
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US2885774A
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US3016028A
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US3244129A
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US3570482A
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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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |