IE50325B1

IE50325B1 - Slide fastener having woven stringer tapes and woven-in teeth

Info

Publication number: IE50325B1
Application number: IE2097/80A
Authority: IE
Original assignee: Opti Patent Forschung Fab
Priority date: 1979-10-10
Filing date: 1980-10-09
Publication date: 1986-04-02
Also published as: IE802097L; GR69868B; IT8025260A0; ES8105926A1; IL61183A0; NO149909B; RO85925A; MX151280A; DD153573A5; DK152525B; FR2466961A1; FI68956B; JPH0217163B2; JPH0191804A; IT1132942B; RO85925B; PT71892A; AR221662A1; NZ195075A; BR8006489A

Abstract

The stringer tapes are made up of main warp threads and mutually adjacent double wefts (4, 5) of a continuous main weft thread (6). The rows of closure members are designed in each case in the form of a plastic monofilament double weft, with lower and upper limbs (8, 9) of the closure members lying essentially superimposed in a projection towards the zip fastener plane. They are covered by binder warp threads (12) offset in relation to one another in the longitudinal direction of the zip fastener with respect to the weft insertion, and are thus connected to the stringer tape. Moreover, double wefts (5) of the main weft threads (6) in the area between the closure members (8, 9) and in addition double wefts (4) of the main weft threads (6) under the closure members (8, 9) are arranged in individual main warp thread pockets of a stringer tape area lying under the closure members. The double wefts (5) of the main weft thread are pulled up in the area between the closure members (8, 9) by means of at least one of the binder warp threads (12) over the plane of the stringer tapes into the area between the closure members, advantageously as far as or above the level of the upper limb (9) of the closure members. In this way the resistance of the zip fastener to bending is improved. <IMAGE> [FR2466961A1]

Description

The invention relates to fche class of a slide fastener having woven stringer tapes and woven-in plastics monofilament teeth produced during weaving, the stringer tapes being devised from ground warp yarns 5 and adjacent double wefts of a continuous ground weft yarn and the tooth rows each being in the form of a plastics monofilament double weft, the individual teeth of the row having a top arm and a bottom arm which in a projection on the fastener plane are disposed substan10 tially one above another, the teeth having coupling heads and rear connecting parts, securing warp yarns which are offset from one another lengthwise of the fastener relatively to the pick of the weft engaging over the tooth rows to secure the same to the stringer tape, some double wefts of the ground weft yarns being disposed between the teeth and other such double wefts being disposed below the teeth in separate ground warp yarn pockets of a stringer tape zone below the teeth.

In a slide fastener of this kind the ground weft yarn double 2o wefts on the one hand and the monofilament double wefts on the other hand in the two halve? of.the fastener are disposed in separate pockets disposed one above another perpendicularly to the fastener plane, the rows of teeth being secured iri the manner described. The result is-‘a soft and flexible slide - 3 fastener, since the weft yarns of the stringer tape and the stringer tape as a whole can move above the tooth rows in response to bending stresses in the fastener plane and in response to kinking. On obtains, however, a slide fastener the tooth pitch of which remains very stable and does not alter as a result of dyeing or washing or ironing.

Another problem with slide fasteners of the kind to which the invention relates is their anti-kinking property.

This term denotes the transverse tensile strength of a slide fastener in response to kinking thereof up or down from the fastener plane. Of course this property increases substantially parabolieally with the radius of curvature near the kink angle - i.e., the smaller the kink angle, the worse is the ability to withstand kinking.

It is the object of the invention to improve the kink resistance (anti-kinking property) of a slide fastener of the kind described.

According to the invention, a slide fastener having woven stringer tapes and woven-in plastics monofilament teeth produced during weaving, the stringer tapes being woven from ground warp yarns and adjacent double wefts of a continuous ground weft yarn each tape having an associated tooth row and each tooth row being in the form of a plastics monofilament double weft, individual teeth of each row having a top arm and a bottom arm which in a projection on the fastener plane are disposed substantially one above another, the teeth having coupling heads and new connecting parts securing warp yarns which are offset from one another lengthwise of the fastener relatively to the pick of the weft engaging over the tooth rows to secure the same to the stringer tape, some double wefts of the ground weft yams being disposed between adjacent teeth and other such double wefts being disposed in separate ground warp yarn pockets of a stringer tape zone under teeth, characterized in that the double wefts of the ground weft yarns between the teeth are drawn up by at least one of the securing warp yarns beyond the plane of the stringer tapes between adjacent teeth. A preferred embodiment is characterised in that the securing warp yarns engage over two teeth and below the ground double weft yam therebetween, then engage below the next tooth between the bottom arm thereof and the double - 5 weft therebelow, and are then secured in the stringer tape zone below the teeth; and the double wefts disposed between consecutive teeth are drawn by at least one of the securing warp yarns, as a ground weft padding loop, as far as or beyond the level of the top arms of the teeth. The starting point for the invention is that the kink resistance of slide fasteners of the kind of interest in the present context can be improved by support pads disposed between the tooth top arms. - The invention is based upon the recogni10 tion that in slide fasteners of the kind referred to the kink resistance is improved by pads between the top arms of the teeth. The pads reduce the curvature of kinking arising in response to particular kinking forces - i.e., they ensure that the radius of curvature at the kink is not too small 15 and thus increase the kink resistance. To control the effect, the ground weft yarn double wefts disposed between the teeth are drawn up by more than one of the warp securing yarns to form a ground weft yarn padding loop. As a factor contributing to the required support effect, at least one 2o of the ground warp yarns between adjacent teeth is also drawn as a ground warp yarn padding loop as far as or above the level of the top arms of the teeth.

Within the scope of the invention the securing warp yarns can be secured to the stringer tape in any manner required. A preferred embodiment of the invention is in - 6 tnio respect e.iraeterised in that the securing warp yarns engage, where they are secured to the stringer tape zone below the teeth, below two double wefts, the warp yarns engaging below one such double weft in the region between adjacent teeth and below the other double weft below the teeth. In another embodiment which has proved satisfactory, the securing warp yarns engage, where they are secured to the stringer tape zone below the teeth, below the.double weft between adjacent teeth, then extend between the bottom arm of the next tooth and the double weft therebelow to engage over the next two teeth. If, with the teeth interlocked, the ground weft padding loops and/or the ground warp padding loops fill up the interval between adjacent tooth top arms and the locked coupling head, the risk of the fastener opening up accidentally is generally reduced; in particular, however, the kink resistance is improved because the effect of the padding loops is that, with the teeth interlocked, the coupling surfaces of the coupling heads are, so to speak, preloaded to engage with one an20 other.

The invention will be described in greater detail hereinafter with reference to diagrammatic and enlarged drawings which show merely an example of embodiments of the invention and in which: Fig. 1 is a diagrammatic view of the pattern or texture slide fastener in accordance with the invention; - Ί 5032S Fig.2 is a plan view showing part of a slide fastener devised In accordance with Fig. 1; Fig. 3 is a section on the line A-A of Fig. 2; Fig. 4 is a view looking in the direction of an arrow B in Fig. 2; Fig. 5 is a plan view similar to Fig. 2 of the product but in a more realistic illustration; Fig. 6 is a view similar to Fig. 1 showing a different kind of pattern or texture for a slide fastener in accordance with the invention; Fig. 7 is a plan view showing part of a slide fastener devised in accordance with Fig. 6; Fig. 8 is a section on the line C-C of Fig. 7; Fig. Q is a view looking in the direction of an arrow D in Fig. 7; Fig.10 is a plan view similar to Fig. 2 of a slide fastener in accordance with the invention in a more realistic illustration; Fig.11 is a plan view similar to Fig. 2 of another embodiment of a slide fastener in accordance with the invention, and Fig.12 is a section on the line C-C of Fig. 11.

The slide fastener illustrated in Figures 1 to 10 has woven stringer tapes 1 and, woven therein, teeth 2 which are produced during weaving from plastics monofilaments. The stringer tapes 1 are embodied by ground warp yarns J and adjacent double wefts 4, 5 of a continuous ground weft yarn 6. Each tooth row 7 has teeth 2 which are picked as a plastics monofilament double weft and which each have a bottom arm 8 and a top arm 9, the arms being disposed substantially one above another in a projection on to the fastener plane, the teeth also comprising coupling heads 10 and rear connecting parts 11. Securing warp yarns 12 engage over the teeth 2 to secure the same to the stringer tape 1. The double wefts 4, 5 are disposed between the teeth 2 and also therebelow in their own ground warp yarn pockets 13 in a zone of the stringer tape below the teeth 2. As can be gathered more particularly from Flg.s 1 and 6, the yarns 12 engage over two consecutive teeth 2 and below the double weft 5 therebetween. This feature is recognizable as the previously-mentioned offset of the securing warp yarns 12 by one step at a time lengthwise of the slide fastener. For the sake of clarity in Fig. 1, the staggered warp yarns are shown in different forms of line. After engaging over the two consecutive teeth 2 the yarn 12 engages below the next tooth 2 between bottom arm 8 thereof and the double weft 4 therebelow, whereafter the yarns 12 are secured in the stringer tape zone below the teeth 2. As can also be gathered very clearly from Figs. 1 and 6, the between-teeth double wefts 5 are drawn by at least one of the yarns 12, - 9 as a ground weft yarn padding loop 14, as far as or above the level of the top tooth arms 9. This feature can be understood better by comparing Figs. 2-5 and 7 - 10.

Figs. 5 and 10 show that the loops 14 between the tooth top arms 9 form pad-like elements. Also, one or more ground warp yarns 5 between adjacent teeth 2 can be drawn, as ground warp yarn padding loops 15, as far as or above the level of the tooth top arms 9, as can be gathered more particularly from Fig. 6 and for the rest from Pigs. 7 - 10. in the embodiment shown in Figs. 1 to 5 the yarns 12 are secured to the stringer tape in a special way, engaging, where they are secured in the stringer tape zone below the teeth 2, below two consecutive double wefts 4, 5 - i.e., a double weft 5 disposed between adjacent teeth 2 and a double weft 4 disposed therebelow. In this connection there is a slight variation in the embodiment shown in Figs. 6 - 10, As will be anparents, the yarns 12 engage, where they are secured in the carrier tape zone below the teeth 2, below the between-teeth double weft 5, but then extend between the bottom arm 8 of the next tooth 2 and the double weft 4 therebelow to engage over the next two teeth 2. Figs. 5 and 10 show a preferred embodiment of the invention wherein, with the teeth 2 interlocked, the padding loops 14 and/or 15 fill up as a pad the interval between adjacent tooth top arms 9 and the locked coupling head 10, so that the coupling surfaces are, as it were, preloaded into engagement with one another. 325 - 10 The slide fastener, some of which is shown in Figs. 11 and 12, has woven stringer tapes 1 and, woven therein, tooth rows 7 which consist of a plastics monofilament and which are produced during weaving. - For the sake of clarity in the Figures, weft yarns 6 of stringer tape 1 are shown in an exaggerated thickness whereas warp yarns p of tape 1 are shown in an exaggerated thinness as discrete dashes. In the sectional view given in Fig. 12, the securing warp yarns 12 to be described hereinafter are shown in solid line, chaindotted line and in other forms of line to differentiate between differently guided securing warp yarns 12, In conformity with Figs. 1 to 10 one can gather firstly from Figs. 11 and 12 that the stringer tapes 1 are woven from the warp yarns 5, 12 and double wefts 4, 5, disposed one beside another, of a continuous ground weft yarn 6. The tooth rows 7 are in the form of a helical plastics monofilament double weft, the arms 8, 9 of the discrete teeth 2 being disposed substantially one above another in projection on the fastener plane, the teeth 2 having coupling heads 10 and rear connecting parts 11. The ground weft yarns 6 extend as double weft as far as the coupling heads 10 which are of course exposed. The yarns 12 engage alternately over the teeth 2 and alternately below the double wefts of the yarns 6; consequently, the rows 7 as a whole are secured to the associated stringer tape 1. In all cases every other double weft 4 of -lithe yarns 6 is disposed below the teeth 2 in separate stringer tape warp yarn pockets 13· The tapes 1 have near the teeth 2 a portion 16 which extends lengthwise of the fastener and which is embodied by double wefts 4, 5 and ground warp yarns 3; to ensure pitch stability the double wefts 4, 5 are disposed below and then between the teeth 2. The warp yarns 12 securing the teeth 2 to the tapes 1 are guided alternately In a special manner which can be gathered from Fig. 12. As will be apparant, securing warp yarns 12 extend above the stringer tape plane with an offset of two weft picks from one another; in a repeating pattern each such yarn 12 alternately engages over a pair of teeth 2 and the tooth 2 immediately following such pair, then below the next tooth 2 and so on. Also, each yarn 12 engages, between the engaged-over tooth pair 17 and the immediately following single tooth 2, below the between-teeth double weft 5· The yarns 12 also engage, between the engaged-over single tooth 2 and the immediately following engaged-under single tooth 2, below the corresponding double weft 5· The drawings 11 and 12 show four securing warp yarns 12 arranged as described, but it lies within the scope of the invention to provide more or fewer yarns 12 than four; also, similarly guided securing warp yarns can be combined into groups.

The basis principle of the Invention is illustrated by the embodiments shown in Figs. 1 to 10 as well as by 5032S - 12 those shown in Figs. 11 and 12. This principle is caracte rised in that the double wefts 5 of the ground weft yarns in the zone between the teeth 2 are drawn up hy at least one of the securing warp yarns 12 beyond the plane of the stringer tapes 1 into the zone between the teeth 2.

Claims

1. CLAIMS:1. A slide fastener having woven stringer tapes and woven-in plastics monofilament teeth produced during weaving, the stringer tapes being woven from 5 ground warp yarns and adjacent double wefts of a continuous ground weft yarn each tape having an associated tooth row and each tooth row being in the form of a plastics monofilament double weft, individual teeth of each row having a top arm and a bottom arm which in 10 a projection on the fastener plane are disposed substantially one above another, the teeth having coupling heads and new connecting parts securing warp yarns which are offset from one another lengthwise of the fastener relatively to the pick of the weft engaging over the 15 tooth rows to secure the same to the stringer tape, some double wefts of the ground weft yarns being disposed between adjacent teeth and other such double wefts being disposed in separate ground warp yarn pockets of a stringer tape zone under teeth, characterised in that 20 the double wefts of the ground weft yarns between the teeth are drawn up by at least one of the securing warp yarns beyond the plane of the stringer tapes between adjacent teeth. - 14 2. A sJice fastener according to ciaitn 1, characterised in that the securing warp yarns engage over two adjacent teeth and under the ground double weft yarn therebetween, then engage under the next tooth between a bottom arm 5 thereof and a double weft therebelow, and are then secured in the stringer tape zone under the teeth; and the double wefts disposed between adjacent teeth are drawn by at least one of the securing warp yarns, as a ground weft padding loop, at least as far as or beyond the yo level of a top arm of the teeth.

2. , characterized in that at least one of the ground warp yarns between adjacent teeth is drawn as a ground warp padding loop at least as far as the level of a top arm of 15 the teeth. 3. , characterised in that the securing warp yarns engage, where they are secured to the stringer tape below the teeth, below two double wefts, the warp yarns 2 0 engaging below one such double weft in the region between adjacent teeth and below the other double weft below the teeth. - 15 5. Λ Sxide fastener according to claim 2, characterized in that the securing warp yarns engage, where they are secured to the stringer tape zone below the teeth, below the double weft between adjacent 5 teeth, then extend between the bottom arm of the next tooth and the double weft therebelow to engage over the next two teeth, 6. A slide fastener according to claim 1 or 2, characterised in that, with the teeth interlocked, the 10 padding loops fill up the interval between adjacent tooth top arms and the locked coupling head. 7. A slide fastener according to claim 1, characterised in that the stringer tapes have, near the teeth, a portion which extends lengthwise of the slide fastener 15 and consists of ground weft yarn double wefts ground warp yarns, the double wefts being disposed on the one hand below the teeth and on the other hand therebetween; and securing warp yarns extend above the plane of the stringer tape 2o plane in each case with a stagger of two picks and in a repeating pattern and each such yarn engage alternately over a tooth pair and one following tooth and below the next and so on, each securing warp yarn engaging, - 16 between the tooth pai r over which it engages and the next tooth, below the between-teeth double weft. 8. A slide fastener according to claim 7, characterised in that the securing warp yarns also engage,

3. A slide fastener according to either of claims 1 or

4. A slide fastener according to either of claims 1 to

5. Between the individually engaged-over tooth and the immediately following engaged-under tooth, over the between-teeth double weft9. A slide fastener according to claim 1, substantially as herein described.