AU4277778A - Slide fastener - Google Patents

Description

Fonn PATENTS ACT 1952-1973

COMPLETE SPECIFICATION (ORIGINAL) 42777178 FOR OFFICE USE Class:

Int. CI:

:0*Application Number. Lodged:

6* rppete Specification-Lodged: Accepted: Published:

.:P.Oority so*

Related Art: *0 0

TO BE COMPLETED BY APPLICANT e Nime of Applicant: OPTIIAN W. ERICH HEIU1A1M jmbH

O9tjress; of '%pplicant: Riedst--asse 3, CH-6330 Chain, Switzerland. 00

Actual Inventor: HELM4UT HEIhBERGER

Address for Service: Care of' Callinan and Associates., Patent Attorneys,of 48-50 Bridge Road, Richmnond, Victoria, 3121, Australia.

Complete Specification for the invention entitled: "SLIDE FASTEME"

The following statement is a full description of this invention, including the best method of performing h, known to me- "Note: The description is to be typed in double spacing. pica type face, in an ia nnt exceeding 250mwnin depth and 160 mmn in width, on tough white paper of good quality and It is to be Inseeted inside this form 11710176-L F. D. Atkinson. Government Printer, Canberra

The present invention relates to slide fasteners. r1ore particularly the present invention relates to a slide fastener of the type having continuous rows of closure elements made of plastics monofilaments, textile stringer tapes and securing means in the form of a double chain stitch seam, wherein the said rows have closure elements with arms which in projection on the plane of the fastener S* register with one another, the top arms of the closure elements being formed with recesses for the sewing yarn, CIN and wherein the gripper yarn loops of the associated double chain stitch seam are arranged. The double chain stitch seams connect the rows of closure elements to the stringer tapes. They may realize as one-needle double chain stitch seams or as two-needle double chain stitch seams. The closure elements have stamped connecting heads and are combined by means of rear connecting portions to form helical or meandering rows of closure elements. The term "gripper yarn loops" denotes the sewing yarns of the gripper yarn loops. The term "stringer tape needle punctures" denotes apertures which result from the insertion of sewing needles and through which apertures the needle yarns of the double chain stitch seams extend. The term "double chain stitch seam" denotes sewing seam connections of the kind disclosed e.g. by German Industrial Standard 61400. In known slide fastenerR of thi kind the recesses for the yarns serve only to, as it were, recess or "counter- sink" the gripper yarn loops or sewing yarns of some other sewing seam securing, to prevent abrasion by the fastener or for other reasons. The recesses contribute nothing to improving the operational parameters of the fastenaer, more particularly to improving flexibility in the plane of the fastener, improving flexibility in the opening and ;,losing so movements of the fastener, increasing the resistance to :0.t 000~ gaping in response 'to a transver'se pull or thrust or as a reuto edn n roto h atee ln.Frhr

00

*1C more, the recesses for the sewing yarn in the known construc- tion are notches and, as such, are produced for example by 0:00 shaping involving the removal of material by cutting. They have no widening projecting in the longitudinal direction of

0. the slide fastener. 4,1500The known measures lead to serious disadvantages. *000

In fact, shaping involving the removal of material weakens the 0. 0. material and leads to notch stress formation in response to mechanical stresses, more particularly bending stresses,, and 000*0:to a risk of breakage. This applies particularly when the

notch depth used is approximately 50% of the thickness of the plastics monofilament. However, notch depths of this nature are necessary if the gripper yarn loops or the sewing yarns of some other securing involving a sewing seam are to be properly recessed. Yet another consideration is that contriving such recesses as notches by shaping involving the removal of material makes inevitable the appearance of sh&rp edg-s which tend to cut the yarns, with the possible result of premature breakage thereof. This is a nuisance,, particularly. when the securing by a sewing seam is embodied as a double chain stitch seam, for a seam of the latter kind may readily be pulled completely open after a yarn rupture. In the own construction the stringer-tape needle punctures are kn. disposed lengthwise of the fastener and after the recesses '~for the sewing yarn but not, as considered in relation to 2006%the transverse direction of the fastener, adjacent the latter 000 recesses. 6:06Slide fastene3rs of the aforementioned type are so*: kno,.. (German Offenlegumgsschrift 14 35 815 and German Auslegeschrift 14 35 841) wherein the yarn-receiving recesses *00 0 r~o* are just arcuate deformations of the top arms of the closure elements the recesses are contrived without shapin 0.

0 0: involving the removal of material and without the displacement 0

0

elements "there is a gap permitting such arcuate deformations. Here the recesses are relatively wide transversely of the fastener and have shallow side walls. Consequently, the gripper yarn loops o1f two-needle double chain stitch seams or other kinds of sewing yarns having a sewn seam securing are not retained firmly enough and may shift and work loose in response to transverse pulls on the closed fastener, so that the end result is that the stability against gaping is inadequate and aismeshing may occur, at least in some regions, after relatively long use. In this construction the stringer-tape needle punctures are disposed before and after the arcuate yarn recesses as considered lengthwise of the fastener but not adjacent one another as considered transversely thereof. Similar constructions are known (German Patent Specification 12 92 4I27) wherein the closure 0O 0 0*O c~4 elements used for the continuous rows are substantially dumb- 0*

S 506 bell shaped and not loop-shaped. However, closure elements *0

:rQ..

of this kind are impossible to produce in practice, more 00 6O S

0@ particularly insofar as the production of very thin slide S

S 0000 a fasteners for the ready-to-wear trade is concerned. 0666 The present invention seeks to develop a slide fastener of the aforementioned type wherein the flexibility 00

in the plane of the fastener even di.ring a-sliding movement 66

*00 is improved, as is also its gape resistance. The term "gape 0

00

6 00 S

00 resistance" means particularly the so-called transverse 0 000000 0 strength under bending o~f the slide f astenec. The invention 0

050000 0 further seeks to ensure that th~e gripper yarn loops and/or 0

the needle yarn of the double chain stitch seam do not 00

experience any severing stresses on the edges of the ya-ra- receiving recesses and are retained reliably under transverse traction. In accordance with the invention the recesses for the sewing yarn are in the form of grooves arising as a result of the displacement of uaterial, widenings which arise as a result of the displacement Lf material projection on both sides lengthwise of the fastener (the widenings not contacting these widenings which are adjacent lengthwise of the fastener). The widenings of the top arms of the closure elements engage like an umbrella over the bottom arms by way of a socket-like part (with little distance or coLcact). German Patent Specification 22 21 324 discloses recesses arising from displacement of material in the arms of the closure, elements of slide fasteners having continuous rows of closure elements. However, in the known arrangements the recesses do not serve as grooves adapted to receive sew- ing yarns yet to improve the flexibility of the plastics monofilament by reducing the section modulus in knitting or some other shaping operation.

The invention proceeds from the knowledge that the

recesses for the sewing yarns may be made easily with widen- ings arising from displacement which are themselves in the

described manner mouldable and usable as sockets. The 0

sockets produce a clamping of the arms, at least under trans- 00000•

00 verse traction. The clamping itself results in a considerable 0 0 increase in the gape resistance under bending. In fact, the

arms of the closure elements are no longer apt to slide one against the other under such stresses. The invention proceeds further from the knowledge that the widenings arising from displacement do not disturb

the fastening of the rows of closure elements on the stringer tape if the needle is inserted adjacent the widenings arising from displacement. This allows, in the case of using one-needle double chain stitch seams as well in the use of two-needle double chain stitch seams, particularly effective fastenings by the stitch seams. Thus, the wide- Snings arising from displacement may, irrespective of the t- stitches of the fastening to be made later, be produced by the displacement of material by shaping using heat V0

C and/or pressiag~ The widenings may therefore readily be produced in a single working step (by appropriate shaping by means of tools).

Furthermore, such widenings form, as it were, a widened support surface for the gripper yarn loops disposed

in the recesses for the sewing yarns. The result is that the

surface pressure experienced by such loops is relatively reduced even though yarn stresses are high.

Another advantage is very reliable location of the

gripper yarn loops unaffected by the usual stresses exper- ienced by a slide fastener. Since the recesses for the

sewing yarn in the slide fastener according to the invention arise as a result of the displacement of material, there are no cutting edges at such recesses nor at such widenings. Consequently the gripper yarn loops i.e. the needle yarns do not experience severing stresses. Furthermore the dis- placed material still remains available for the section

modulus which is important for strength so that there is no premature rupture of the plastics monofilament, even in the event of extreme stresses in the region of the impressed grooves for the sewing yarns. Furthermore the widenings thus contrived serve as elements for guiding the sewing yarns of the sewing-seam securing during the actual sewing S step. t- In order that the invention may be more clearly oe- V. understood and put into practical effect there shall now be 0* CI described in detail preferred constructions of a slide fastener arrangement in accordance with the invention.

The description is given by way of non-limitative example only and is with reference to the accompanying drawings, *000

wherein: Fig. 1 is a fragmented plan view of a slide fastener according to the invention with a two-needle double chain stitch seam on a scale enlarged by a magnifying lens, and fragmented; Fig. 2 is a section on the line A-A of Fig. Fig. 2 is a section on the line A-B of Fig. 1; Fig. 5 is a section on the line B-B of Fig. 2;

,y0> Fig. 4 shows the coupled-together closure-element rows of the subject matter of Fig. 2 after the stringer tape

and seam securing have been removed;

Fig. 5 corresponds to Fig. 1, but shows a slide fastener according to the invention with a one-needle double

cha'n stitch seam;

Fig. 6 is a section on the line C-C of Fig.

Fig. 7 is a section on the line D-D of Fig. 6, and Fig. 8 shows the coupled-together closure-element rows of the subject of Pig. 6 after the string\ tape and seam securing have been removed. The slide fastener shown in Figures 1 to 4 has a continuous row 1 *f closure elements made of a plastics Oe 00 monofilament. It further includes textile stringer tapes

6e LI 2 and a securing seam in the form of a two-needle double 9* eg chain stitch seam 3. In a preferred embodiment the contin- 0 uous rows 1 take the form of helical rows 1 of closure

elements. Fig. 1 provides a partial view seen, as it were, through a magnifying lens. The enlarged view shows to a very considerable enlargement the components of a slide fastener according to the invention as hereinbefore described. Figs. 2 to 4 are to the same scale as the enlarged view S

forming part of Fig. 1. As will be immediately apparent, 00 the rows 1 include closure elements 4 which have arms 5, 6 registering with one ancther in projection on the plane of S

the fastener, the top arms 5 being formed with yarn- receiving recesses or grooves 7 receiving gripper-yarn loops 8 of the two-needle double chain stitch seam 3. Needle yarns 9 thereof extend two at a time through two adjacent stringer- tape punctures 10 disposed between longitudinally adjacent closure elements 4. The needle types concerned in the embodiment and in a preferred form of the invention are types

402 or 405 or 406 to German Industrial Standard 61400. As will be apparent, more particularly from a comparison between Fig. 4 and the enlarged portion of Fig. 1, the grooves 7 arise as a result of a displacement of m~aterial, such displacement leading to widenings 11 project- rZ ing on both sides lengthwise of the fastener. The widenings *0 0S 11 do not contact widenings 11 which are adjacent in the 0**

0e ilongitudinal direc~tion of the slide fastener. The two 0* 000 ~4punctures 10 fox, the associated seam 3 are disposed adjacent

the widenings 11 trzknsversely of the fastener. Relaticuships 00 0 00 0O 0 described more particula~rly with reference to Fig. 2 there- 0 *000 0 9000 fore arise in relatioL i the securing of the sewing seam. As will be apparent, the needle yarns 9 of the seams 3 extend 00 at an angle of from approximately 450 to 600 to the plane of 0O 0 00 the fastener and, referred to such plane, to the loops 8 0 disposed in the grooves 7. The angles mentioned are ascribed 00 0 0@

*00000 g0 to axial extensions of the corresponding sewing-yarn portions 0 0 in Fig. 2. In other words, the needle yarns 9 of the seams 0 000000 0 3 extend towards the loop 8 and therefore to the grooves 7 in a substantially inverted V-shape. Consequently, a form of articulation arises below the widenings 11. As is alao shown clearly in Fig- 3, the widenings 11 of the top arms of the elements 4 engage over or partly engage around the corresponding bottom arms 6 by way of a socket 12. A contact is not necessary, as may be seen from the enlarged section of Fig. 2. This leads, at least under transverse traction, to a satisfactory positive engagement between the two arms

6 of the various elements 4. Thereby the gape

resistance under transverse traction is improved. As a

comparison between the view given in Fig. 4 and the enlarged K part of gig. 1 will show, however, in fact the depth T of t- the grooves 7 corresponds at least to the width B thereof t and at most to the value D/2, D denoting the diameter of CSJ the monofilament. 0O A particularly important consideration is that the

SJ*, sewing seam is so devised that sewing may be so performed that parts of the loops 8 engage, as it were, around the widenings 11. This may be gathered more particularly from 9990

a comparison of Pigs. 2 and 3. The grooves 7 have, through-

out the embodiments of Figs. 1 to 4 and 5 to 8, steep side

walls or flanks 13 whose tangents Ta intersect the plane of 0* the fastener in a cross-section at right-angles to the

fastener plane and transversely to fastener length at

substantially 90°, as indicated by the tangents Ta shown in

SFig. 4. Nevertheless, there is no effective or noticeable 4 reduction in strength since the widenings 11 contribute to

the strength.

The slide fastener shown in Figures 5 to 8 has a

continuous row 1 of closure elements made of a plastics

monfilament. It further includes textile stringer tapes 2

and a securing seam in the form of a one-needle double chain stitch seam 3. In a preferred embodiment the continuous row 1 takes the form of helical rows 1 of closure elements.

Fig. 5 provides a partial view seen, as it were, through a magnifying lens. The enlarged view shows to a very consid- erable enlargement the components of a slide fastener according to the invention as hereinbefore described. Figs.

o 6 to 8 are to the same scale as the enlarged view forming St-- part of Fig. S. As will be immediately apparent, the rows 1 include closure elements 4 which have arms 5, 6 registering

with one another in projection on the plane of the fastener, the top arms 5 being formed with yarn-receiving recesses or o grooves 7 receiving gripper-yarn loops 8 of the one-needle

double chain stitch seam 3. Needle yarns 9 thereof extend

two at a time through two adjacent stringer-tape punctures

10 disposed between longitudinally adjactnt closure elements 4. The needle types concerned in the embodiment as shown in

S. PFigs. 5 to 8 are types 401 or 404 to German Industrial 00* Standard 61400. As will be apparent, more particularly from

a comparison between Fig. 5 and the enlarged portion of Fig.

8, the grooves 7 arise as a result of a displacement of material, such displacement leading to widenings 11 projecting

on both sides lengthwise of the fastener. The widenings 11

do not contact widenings 11 which are adjacent in the longit-

udinal direction of the slide fastener. The distance is,

however, so small that a needle cannot puncture therebetween.

The two punctures 10 lie, as may be seen paricularly by a comparative view to Figures 5 and 6, nevertheless longitud- inally of the fastener before and behind the widenings 11. Therewith, in the preferred embodiment the sewing-yarns for the gripper yarn loops 8 extend in such a way that at least on one longitudinal side of the closure elements 4 gripper yarn loop-'parts 14 engage the widenings 11 on both transverse eec sides. This at least means that the engagement is made on that side on which the gripper yarn loops 8 are closed. The arrangement may be made also. in such a way that the widenings 11 are engaged on both longitudinal sides of the closure elements 4 by correspondingly spread sewing yarns of the gripper yarn loops 8. It is of particular importance that the widenings 11 of the top arms 5 of the closure elements 4 ego**eengage over the relative bottom arms 6 by way of a socket- like part 12. The enlarged section of Fig. 7 shows that a contact of the socket-like part 12 with the relative'lower arm 6 is not necessary7. Under transverse traction a gape resistance between the top and bottom armes 5, 6 is obtained, and at the same time broad pick ups for the sewing yarns of the gripper yarn loops 8 are obtained, at which as already mentioned the surface pressures are reduced even though yarn stresses are high. In order to realise the construction as shown in Figuz, s 5 to 8 the stringer-tape punctures 10 have been made adjacent the widenings 11, and the rows of closure elements 1 have been drawn by the yarn tension of the gripper yarns 8 and/or of the needle yarns 9 in that position in which the stringer-tape punctures 10 lie longitiudinally to the fast- ener bef ore and behind the videnings 11. Fiiually, it is to be understood that the af ore- going description refers merely to preferred embodiments of the present invention, and that variations and modifications are possible witho,.t departing from tha spirit and scope of the invention, the ambit of which is to be determined from O 9 '4O the following claims. 000

0* 0 09

0 0 0 S 0

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Claims (3)

1. The claims defining the invention are as follows: 1. A slide fastener having continuous rows of closure elements made of plastics monofilament, textile stringer tapes and securing seams in the form of a double chain stitch seam, the said rows having closure elements with arms which in projection on the plane of the fastener register with one t another, the top arms of the closure elements being formed 6* with recesses for the sewing yarn, the gripper yarn loops of C the associated double chain stitch seam being disposed in

   such recesses, wherein the recesses for the sewing yarn are

   in the form of grooves arising as a result of the displacement O 0

   of material, widenings which arise as a result of said dis-

   placement of material projecting on both sides lengthwise

   of said fastener, and wherein said widenings of said top

   arms of said closure elements engage over the bottom arms

   by way of a socket-like part like an umbrella.
2. 2. The fastener according to claim 1, having plastics

   monofilaments of diameter D, wherein the depth of said grooves

   is at least equal to the width thereof and at most equal to

   D/2,
3. 3. The fastener according to claim 1 or claim 2,

   wherein said grooves have steep sidewalls whose tangents

   intersect the plane of said fastener as nearly at right-

   angles as possible in a cross-section perpendicular to the

   fastener plane and transversely of fastener length.

   4. The fastener according to any one of clairis 1 to 3, having securing seams in the form of a two-needle double chain stitch seam, the needle yarns of said seam extending through two adjacent needle punctures in the stringer tape, said punctures being disposed between longitudinally adjacent closure elements, wherein said two stringer-tape punctures

   t- are disposed transversely to said slide fastener adjacent

   C, said widenings. The fastener according to claim 4, wherein said stringer-tape punctures are disposed such that the needle S. yarns of the two-needle double chain stitch seams extend, at 00 an angle of from 450 to 600 to the plane of said fastener,

   to-the gripper yarn loops disposed in said grooves and extend through said loops at half the height of said closure element. 6. The fastener according to any one of claims 1 to 3, having securing seams in the form of a one-needle double CO chain stitch seam, the needle yarns of such seam extending a 0 through two adjacent needle punctures in the stringer tape, e~g...wherein said widenings arising from a displacement do not S contact the adjacent widenings lying in the longitudinal direction of said fastener and wherein the stringer-tape punctures of the associated one-needle double chain stitch seam are disposed longitudinally of the fastener before and behind the widenings. 7. The fastener according to Claim 6, wherein said stringer-tape punctures are disposed such that the widenings are eIngaged on at least one longitudinal side of said closure-elements,, on both their transverse sides, by gripper yarn loop parts. 8. A method of manufacturing a slide fastener according to claim 7, wherein the rows of closure elements are laid iipon their respective stringer tapes and are oil fastened thereon by means of a one-needle double chain stitch seam, the stringer-tape punctures being made between adjacent 04 "~closure elements, and wherein said stringer-tape punctures se are made transversely to the fastener adjacent said widenings, and the rows of closure elements are drawn by the yarn tension of said gripper yarns and/or of the needle yarns in that position in which said stringer-tape punctures lie in the longitudinal direction of said fastener before and behind said widenings. A slide fastener, substantially as described herein *0 with reference to the accompanying drawings. A method of manufacturing a slide fastener, sub- stantially as herein described with reference to the accomp- anying drawings. D A T E D this 20th day of December, 1978.

   OPT ILON W. ERICH HEII IANN GmbH By its Patent Attorneys: CAIALINAR AND] ASSOCIATES

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