US3871420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for manufacturing slide fastener elements
Assignee: PRESTIL
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Filing: 1974-01-02
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Granted: 1975-03-18
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Expires: 1994-01-02
Abstract
Abstract This method and the apparatus for carrying out same are characterised essentially in that, during the weaving of the tape of the element, two separate filaments are inserted into the texture for constituting the fastening or coupling members propers by engaging by turns one and the other filaments between the warp yarns, at spaced intervals, to constitute at each point of insertion a transverse loop wound in one direction for one filament and in the opposite directions for the other filament, and meanwhile these filaments are disposed in the longitudinal direction on the side opposite to the coupling members proper, whereby these filaments constitute two variable-pitch helices of which the loops wound in opposite directions are imbricated, every other loop belonging to the same helix.
Inventors
- 👤 Horst Jakob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:27
CPC Classifications
A; A44; A44B; A44B19/00; A44B19/42; A44B19/52; A44B19/54; Y; Y10; Y10T; Y10T24/00; Y10T24/25; Y10T24/2518; Y10T24/252
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
Method of manufacturing a slide fastener by incorporating a continuous filament between the warp and weft yarns of a tape, in order to form with said filament transverse loops constituting coupling members along one edge of said tape, this method being characterised in that during the tape weaving operation there are inserted into said tape Two separate filaments adapted to form the coupling members by engaging by turns said filaments between said warp yarns at spaced intervals, in order to form at each point of insertion a transverse loop formed by winding said filaments in opposite directions, by turns, while disposing said filaments in the longitudinal direction on the side opposite to the coupling members proper, whereby said filament form two variable-pitch helices of which the loops wound in opposite directions are imbricated, every other loop belonging to the same helix.
Claim 2
Dependent Claim
141 words
Method of manufacturing a slide fastener by incorporating a continuous filament between the warp and weft yarns of a tape, in order to form with said filament transverse loops constituting coupling members along one edge of said tape, this method being characterised in that during the tape weaving operation there are inserted into said tape Two separate filaments adapted to form the coupling members by engaging by turns said filaments between said warp yarns at spaced intervals, in order to form at each point of insertion a transverse loop formed by winding said filaments in opposite directions, by turns, while disposing said filaments in the longitudinal direction on the side opposite to the coupling members proper, whereby said filament form two variable-pitch helices of which the loops wound in opposite directions are imbricated, every other loop belonging to the same helix.
Claim 3
Dependent Claim
103 words
Method of manufacturing a slide fastener according to claim 1, characterised in that during the formation of each loop with one or the other filament a retaining member is brought to the tape edge lying on the side of said coupling members, and introduced into the previously formed loop, whereby said retaining member, during its return stroke, can elongate said loop and cause in a manner known per se a distortion of the cross-sectional shape of the filament, this distorted portion constituting a coupling member per se, whereafter said retaining member is retracted until the next loop is formed with the other filament.
Claim 4
Dependent Claim
71 words
Manufacturing method according to claim 2, characterised in that during the formation of the transverse loops with one and the other fastener filaments said filaments are wound on themselves in order to cause the connecting portions between two loops of a same filaments to constantly project from a same face of the fastener element, the corresponding connecting portions of the other filament projecting from the other face of said fastener element.
Claim 5
Dependent Claim
150 words
Apparatus for manufacturing a slide fastener by incorporating two continuous filaments between the warp and weft yarns of a tape, said apparatus comprising a weaving loom capable of weaving a tape, and two needles for introducing the two fastener filaments, said last-named needles being disposed in the vicinity of the weft yarn weaving member, and registering with the movable sheet of warp yarns, a retractable retaining member adapted to engage each loop formed by the two filaments being provided along one of the edges of the sheet of warp yarns, adequate control means being provided for alternatively causing one and then the other needles to insert the two filaments beyond the relevant edge of the warp yarns and then move back to a fixed waiting position, and at the same time to bring said retaining member to its operative position and subsequently move said member back to its retracted position.
Claim 6
Dependent Claim
150 words
Apparatus for manufacturing a slide fastener by incorporating two continuous filaments between the warp and weft yarns of a tape, said apparatus comprising a weaving loom capable of weaving a tape, and two needles for introducing the two fastener filaments, said last-named needles being disposed in the vicinity of the weft yarn weaving member, and registering with the movable sheet of warp yarns, a retractable retaining member adapted to engage each loop formed by the two filaments being provided along one of the edges of the sheet of warp yarns, adequate control means being provided for alternatively causing one and then the other needles to insert the two filaments beyond the relevant edge of the warp yarns and then move back to a fixed waiting position, and at the same time to bring said retaining member to its operative position and subsequently move said member back to its retracted position.
Claim 7
Dependent Claim
51 words
An apparatus for manufacturing slide fasteners according to claim 4, characterised in that the needles provided for introducing the two fastener filaments are of the elbow type and pivotally mounted about a pair of fixed axes, said needles being disposed on either side of the sheet formed by said warp yarns.
Claim 8
Dependent Claim
24 words
Apparatus according to claim 4, characterised in that the needles provided for introducing the two filaments are straight and driven for rectilinear reciprocating action.
References Cited (Backward Citations)
US3189964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |