IL33319A - Sliding clasp fasteners - Google Patents

Description

IMPROVEMENTS IN OR RELA ING TO SLIDING CLASP FASTENERS the general type comprising tv/o identical or right - and lef^- handed continuous rows of interlocking elements in the form of coil springs of distorted cross-section made from plastics ;. monofilaments, secured respectively to two textile- .stringer tapes, the ro.ws :of elements bein interlocked and separated by a slider.

Sliding clasp fasteners of this type are known in . •various forms, one such in particular- having .rows of interlocking elements,. n which-;each; -complete element, as seen in projection on a plane at right-angles'- to the plane of the fastener, comprise .two superimposed long .sides,-.' Wi --sideways -proj-ec ing interlockin heads ' formed -at an ' interco nect g' loop section at one end (which section lies' in a plane' /substantially at right-angles to the plane of the fastener), while one element is connected to the next in the continuous row by a connecting section, which curves from its lower long side to the upper long side of the next element, at the back, i.e., on t e^ side remote from the interlocking heads. In usual practice, the loop sections at which . the interlocking heads are formed and project generally form ; an eye to accommodate the interlocking heads in the row of elements on the other 'half of the fastener.; Such rows of interlocking elements of course must be secured to the textile stringer tapes. When the securing is effected by' stitching, one long side of each interlocking ■ element, in- each row lies . on the respective stringer tape in many cases, the' interlocking heads- project beyond, the margin of the stringer tape and the- stitching threads lie on the rows - . of. interlocking, elements. This cannot exclude the. risk of the interlocking elements being forced out, of' the sewn seam in the -.' backward direction, when for example the fasteners on a « · garment or the like are subjected to laundering or dry-cleaning in the open condition. Trouble in this direction can be avoided by the provision along the inside of a row of interlocking elements o a continuous core through which the stitches pass, but of course such core constitutes an additional constructional element* Again, the rows of interlocking elements are sometimes wove as actual weft strands, into the stringer tapes or are introduced as warp strands into an already woven stringer tape, but the stringer tape strands that provide the attachment then lie on the interlocking elements, where they aire exposed to premature wear by contact with foreign objects and the action of the slider* The proposal to protect these attachment strands by laying them in grooves in the monofilaments is impracticabl in the case of sliding clasp fasteners made from very fine plastics monofilaments* , Again, stringer tapes can be provided with recesses into which the interlocking elements can be inserted by pressure, when the connecting sections between the successive elements provide simultaneous attachment, since they are engaged by projecting weft threads in the stringer tapes after insertion, but the interlocking elements themselves still project appreciably beyond the resulting connection points and the leverage is excessive for good resistance of the fastener against being torn open* With slide fasteners of another type (see e.g. German DAS - Speci ication No.1,148,202) the links of which are constituted by a continuous helix, it is known to apply the said helics to carrying cords with part of the windings lying against the cord and to sew these portions of the windings to the cord. This is a rather complicated operation and moreover it has the disadvantage of the necessity of Unitin the cords with the customary carrying tapes. This complicated procedure does not become necessary with fasteners of the type according to the invention.

The object of the invention is to provide for an improved connection between the stringer tapes and the -rows of interlocking elements in a sliding clasp fastener of the general type first described.

According to the present invention a sliding clasp fastener comprises two continuous rows of interlocking elements in the form of coil springs of distorted cross-section, made from plastics monofilaments, secured respectively to two textile stringer tapes, each interlocking elements in a row,' seen in projection on a plane at right-angles to the plane of the fastener, consisting of. a long side clear of the stringer tape, an interlocking head projecting sideways from at least one of the loops at the ends of the long side, which loops lie in planes substantially at right-angles to the plane of the '; fastener, and a connecting section extending from the loop section at one end of the long side to the loop section at the · other end of the next adjacent element, the connectin section lying on the stringer tape. Preferably the connecting sections are secured to the stringer tape. ; · The interlocking elements' are no longer attached to the stringer tapes' towards their rearward ends/ but. by the connecting- section, preferably near its midpoint. The connecting elements thu permits the formation of a strong stable connection between the . interlocking elements and the stringer tapes.

The connecting .sections between the looped ends of the long sides of adjacent elements preferably run obliquely relative to. the longitudinal axis of the fastener. When, as usually in sliding clasp fasteners made from plastics monofilaments, the gaps between the adjacent interlocking elements in each row approximately equal the thickness (diameter) of the monofilament, the connecting section axes, can run at substantially ¾5° to ;' .. , such longitudinal axis. . ;.

According to a further feature of the intention, in order to assist the funtion of the connecting sections as the means for connecting the, elements to the stringer tape, each · connecting section may be flattened or necked -within its length.

A pair of identical rows of interlocking elements may "be used in a fastener or one left - and one right-handed row may be used. In the first case, the interlocking elements shoul have interlocking heads at the loops at both ends of the long side of each element. In the second' case, the interlocking' elements ma "taper, to form an eye-like section from the interlocking head side of the low side remote from the inter-, locking heads. If desired, a continuous core maybe threaded through the inside of the rows of interlocking elements.

The actual connections between the connecting sections i the rows of interlocking elements and the stringer tapes can' be . made in various ways. .Thus, the rows of interlocking elements maybe laid on the stringer tapes for the connecting sections to be engaged by appropriately projecting weft- strands in the stringer, tapes, preferably in the vicinity of the flattenings or necks, where such are .provided.. For this purpose, the stringer tapes may be' provided with either recesses to accommodat the interlocking elements by insertion under pressure (as previously indicated) or the rows- of interlocking elements may be woven to'arid caused to lie on the stringer tapes, simultaneously with the weaving of ' the · tapes, securing .weft threads being specially provided. In both cases,; the · attachment strands of the. stringer apes lie between the interlocking elements, where they are' virtually free from wear i factors,. It is, however, also possible to attach, the' .·.(· connecting sections to the stringer tapes by adhesive bonding' or- welding. Yet again, a stitched attachment' can* be effected by conventional stitching, which makes' for manufacturing simplicity, since conventional sew seams and sewing machines can.be. used to sew .to the stringer.' tapes, the interlocking- interlocking elements; Figure 5 is a section taken on the line B-B of Fig red; Figure 6 is a plan view of yet another form of. a single row of interlocking elements; .

■ .' Figur.e 7. is a section taken on the line C.-C of. igure 6; Figure-.8 is a- section talcen on the line D-D of Figure 1 ; ■Figure 9 is a similar section to'' Figure 8 through a similar but invisible form "of fastener, and Figure 10 is a similar section tc Figure 8 (but -showing' one stringer tape only) but of another form of fastener The continuous rows 1 of interlocking elements in the form of coil springs of distorted cross-section made from plastics mono-filaments are secured respectively to two textile stringer tapes 2. As seen in projection on a plane at right- . > angles to the plane of the fastener (Figures 2 , , and 6), each interlocking elemen 3 in each' row 1 has a. long side indicated b the arrows in Figure 2,. v/ith an interlocking head 5 projecting sideways at one. end (or, as in Figures 6 and 7 at both ends), . and loop sections 6 lying in a' plane substantially at right, angles to the plane of the fastener. The loop sections .6 bend into' connecting' -sections 7 by' whic the interlocking elements are. joined together to form. row.. ; The long sides k lie clear, of the tapes 2 (see Figures 8 to 10). The connecting 'sections 7 lie against the tapes,' i.e.-, they lie in the face of each row 1 that is next . to its tape.' The connecting sections 7 are exposed between the long. sides t and so can be used as the connecting elements' for .securing , the rows.1 to the'tapes. '. - i ■In ail -the-'plan yiev/s, the gaps between the pairs of ' ' adjacent' interlocking elements 3 in each row 1 -can be seen to ' .· approxim tcT the"- thickness of ':the"-'pla«ti'cs monofilaments, v/hich permits the axes of the connecting sections 7 to run at bou k5° to the longitudinal axis 8 of the associated ,row 1 . In practice, the angle can vary somewhat, hearing ins mind that the gaps "between turns, must slightly exceed the ' filament thickness. The angle decreases from l 5° as the "breadth of' the loops 6 is reduced, and increases as their -breadth s augmented. . Figures and 5 show that the regions 9. o .the connecting sections 7 "between the adjacent interlocking elements, can "be flattened or necked.

Figures 3a, 5, and 7 shown the connecting elements and the' long sides k' i parallel planes. ■· In Figures 3b , and.8 to 1 the interlocking elements '3 taper down to an eye-like section f 'the .interlocking heads 5. In Figures 6 and 7, the interlocking elements 3 have interlocking heads 5 at "both loops 6, so that t fastener can,"be made up- from pairs of . identical rows 1 of interlocking elements. Figure'3b shows a continuous core' 10 ; threaded inside the interlocking'velements.3.

In Figures'- 1, 8 , 9 , .and 10, the connecting sections 7 are engaged "by weft strands.1 projecting" from the stringer tapes 2 , in the- vicinity of flattenings 9 formed in the connecting sections 7. In'Figures 8 arid 9 , the stringer tapes 2 are provided with the recesses 2 through which the interlock elements are-: inserted,- to -secure the. rows' to the" tapes. In Figu 1 - and . 0, the stringer tapes 2. have weft strands 13 , "by which the rows 1 of interlocking elements, are woven. into position (to lie on the tape) as the tape is . "being woven. '· · .. - The oblique connecting sections 7 "being exposed "between the long sides, k of the. elements, the rows of elements can be sewn to 'the- stringer tapes 2', v/ith the sewing round . the. connecti sections and well below the top of the.'interlocking elements 3* ¾

Claims (1)

1. WHAT Έ CLAIM IS: . 1. A sliding clasp fastener comprising two continuous rows' of interlocking elements in the form of coil springs of distorted cross-section, made from plastics monofilaments, secured respectivel to two textile stringer tapes, each interlocking elements in a row, seen in projection on a plane at right-angles to the plane of the fastener, consisting of a long side clear o the stringer tape, an interlocking head projecting sideways from at least one of the loops at the1 ends of the long side, which loops lie in. planes substantially" at right-angles to the plane of the fastener, and a connecting section extendin from the loop section at one end of the long side to the loop section at the other end of the next adjacent element, the connecting section lying on the stringer tape. · 2. , A fastener as in Claim 1, wherein the connecting . sections are secured to the stringer tape. 3. 'A fastener as in Claim 1 or Claim 2, wherein the axes of the connecting sections are at substantially 45° to the longitudinal axis of each row of ■ interlocking elements.. k: A fastener as in Claim 1 to 3, wherein the connectin sections have flattenings or necks. 5. A fastener as in any one of Claims 1 to 4, wherein the interlocking elements have interlocking heads at each end of the long sides . ' . i 6. A fastener as in any one of claims 1 to 5» wherein the interlocking elements taper to an eye-like section from the interlocking heads. 7. A fastener as in any one of Claims 1 to 6, wherein the rows . of interlocking, elements contain' a core'. •8... Λ -fastener as in any one of Claims 1 to ,7 , wherein the connecting" sections are encaged by weft strands-projecting from the stringer tapes, in the vicinity of theJflattenings or necks when provided as in Claim 4. ; ·' . 9· -A fastener as in any one of Claims 1 to 8, wherein the connecting sections are secured to the stringer tapes by adhesive bonding or welding. . .. 10. A fastener as in any. one of Claims.1 to 9, wherein-the interlocking elements or the connectin sections are attached to the stringer tapes by means of a sewn seam, in particular by means of two-needle double locked stitching. 11. . Sliding clasp fasteners having rows of interlocking' elements secured to stringer tapes substantially as hereinbefore described with reference