US2804676A - Weaver's knot - Google Patents

Description

Sept. 3, 1957 c. R. SMITH 2,804;676 WEAVERS KNOT Fild Nov.'4. 1955 ATTOQ/VEX WEAVERS KNOT Charles Roland Smith, Fallowfield, Manchester, England assignor to Mellor Bromley & Co. Limited, a British company Application November 4, 1955, Serial No. 545,094

7 Claims priority, application Great Britain November 8, 1954 7 Claims. ((31. 28-72) This invention relates to weavers knots and to an improved method of forming the same.

Bya weavers knot is meant an interlacement of two textile yarns or threads or other filaments (hereinafter for convenience referred to simply as yarns) 'resulting, when tightened, in a knob-like formationwhereby the yarns are tied or fastened together with the yarn ends extending on opposite sides of the said formation.

' A weavers knot, moreover, serves to tie or fasten together ends of yarns being dealt with in textile machinery such, for instance, as spinning and lwinding machines, knitting machines, weaving looms and. the like.

New in a well known relatively flat form of a weavers knot, as produced, for instance, on a conventional Boyce weavers knotter, a closed loop formation of one yarn is interengaged with an open loop of the other yarn, and the extremity of each yarn extends outwardly through a loop of the other yarn, tightening of the knot being effected by pulling on the two yarns in respectively opposite directions. The present invention is concernedv primarily with knots of this form. V i

In practice it is found that such a weavers knot is not very secure in the case of springy, smoot h'and generally lively yarns, such as mohair, cross-bred, and worsteds. On the other hand, when once yarn ends have been tied together in a reasonably secure weavers knot, this knot, when ultimately incorporated in a woven or knitted fabric is not easy to untie to enable the yarn ends to be woven or otherwise incorporatedinto the cloth or fabric during the appropriate finishing operation.

The object of the present invention, therefore, is to provide an improved form of'weavers knot which is generally more secure, but is easier to untie, than a conventional knot.

In a weaversknot formed in accordance with this invention, the end of one of the two yarns tied together, instead of consisting of a single strand passing straight through a loop or bight of the other yarn, comprises two side by side portions extending through the said loop or bight.

These side by side portions are disposed parallel or substantially so and are pressed together in, and help to fill, the tightened knot, thereby making for greater security.

In one embodiment of the invention, the said side by side portions of the relevant yarn are integrally joined and thus constitute the opposite limbs of an additional loop which is interengaged with the aforementioned loop or bight of the other yarn. In this case, the free extremity of the additional loop passes right through the said loop or bight of the other yarn, and the knot can be readily untied, to enable the yarn ends to be neatly incorporated into fabric during an appropriate finishing operation, by the simple expedient of pulling on the free extremity to withdraw the additional loop from the knot.

In another embodiment of the invention, however, the additional loop is cut so that the two side by side portions of the end of the relevant yarn extending through the loop or bight of the other yarn are separated. Thus, in this second, and often preferred, form of the improved knot there are four instead of two free extremities, and the outermost one of the two side by side portions is short and unconnected with the yarn from which it is cut.

nited States Pat P 7 2,804,676 Patented Sept. 3, 1 957 However, the presence of the short, separate piece of yarn, wedged tightly in the loop or bight of the other yarn, is suflicient to prevent the knot from being accidentally pulled inside out and untied. On the other hand, untying of such a knot, to enable the yarn ends to be neatly incorporated into fabric during a finishing operation, can, if required, be readily effected by first withdrawing the said short, separate piece of yarn. In any event, the merit of the particular form of knot just described is that it is safer against accidental untying by, for instance, a latch needle in a knitting machine than is the case where the additional loop is uncut.

The invention accordingly includes a method of producing a weavers knot of the form herein referred to, which includes the characteristic steps of drawing an additional loop of the yarn having therein the closed loop.

formation through the open loop formation of the other yarn, and retaining the additional loop in the knot during tightening of the latter. The method, in appropriate cases, comprises the further step of cutting the additionally drawn loop.

The improved weavers knot may be produced mechanically on any suitable knot-tying device adapted to form the additional loop and retain it in the knot during tight ening of the same. It is accordingly within the scope of the invention to employ a device incorporating a hooked instrument, e. g. a knitting needle, for forming the loops, in which instance an element, such as a pin, would be required for retaining the additional loop and preventing it from being withdrawn from the knot during tightening.

It is, however, mainly the intention to use for the intended purpose a Boyce weavers knotter, suitably modified. A knotter of this type conventionally comprises, as well known to those acquainted with the art concerned, thread gripping and positioning means for crossing two initially parallel yarn ends at spaced points to form a loop therebetween, a rotary tying bill for engaging the crossed yarns and forming a'knot, a scissor device at one side of the knotter for cutting an appropriate one of the yarns, the other yarn being cut by the tying bill, and means for stripping the knot from the said bill. In a knotter of this type the tying bill customarily comprises a stationary tying blade, a pivoted cutting blade or shearing jaw and a third and resilient element co-operable with the latter. Heretofore, appropriate edges of the pivoted cutting blade and of the adjacent resilient element were sharpened so that whenever the bill was closed after being previously opened to receive the appropriate yarn, it functioned to trap and sever this yarn. That is to say, the said yarn was severed by the relatively moving sharpened edges of the bill to produce one of the free short extremities of the knot, and the yarn was trapped between the cutting blade and the stationary tying blade. The trapped extremity of this yarn remained in the bill during stripping of the knot from'the latter as a consequence of which the knot was pulled inside out over the trapped extremity. It will accordingly be appreciated that when typing a knot with a conventional Boyce knotter, both of the yarn ends are cut (one in the side scissor device and the other in the tying bill) before stripping of the knot from the bill; The result of cutting the ends is to produce two short free extremities cm respectively opposite sides of the knot.

To enable a conventional Boyce weavers knotter to produce a knot of the improved form, the elements of the tying bill are so formed as to be adapted to engage the end of the relevant yarn and draw it into an additional loop, and the knotter is provided with a common scissor device arranged and operable to cut both of the yarns after the formed knot has been stripped from the bill,- all as described in our co-pending application Serial No. 545,021, filed Nov. 4, 1955.

In order that the invention may be more clearly understood and readily carried into practical eflfect, specific 3 examples of the improved weavers knot will now be described with reference to the accompanying drawings,

- wherein,

Figure 1 is a diagrammatic representation, for purposes of comparison, of a standard weavers knot of the form concerned,

Figure 2 is a similar representation of such knot modified in accordance With this invention and with the additional loop uncut, and

Figure 3 is an alternative (and often preferred) version of the improved knot showing the additional loop cut to render the knot safer against accidental untying.

Referring to Figure 1 it will be seen that the standard relatively fiat weavers knot depicted therein is produced by tying'together two yarns y and y which, for convenience in illustration, are respectively shaded and unshaded. The knot comprises a closed loop a formed by a crossing of the shaded yarn y at x, which loop is interengaged with an open loop or bight b of the unshaped yarn y. A short extremity consisting of a single strand, of the yarn y extends outwardly through the loop or bight b, whilst a similarly short extremity d of the yarn y extends outwardly through the loop a. The two extremities c and a accordingly protrude from respectively opposite sides of the knot, and the latter is tightened by pulling on the yarns y and y in the opposite directions indicated by the arrows A and B.

The form of the improved knot illustrated in Figure 2 is in many respects similar to the standard knot just described with reference to Figure 1, although, in the interests of greater security, it is modified by the provision therein of an additional loop e of the yarn y which is drawn through the open loop or bight b. As before, the extremity c of the yarn y extends outwardly through the loop or bight b, and the modified knot is tightened in the usual way by pulling on the yarns y and y in the opposite directions A and B respectively. Thus, instead of a short single strand of the yarn y projecting through the loop or bight b as in the standard knot depicted in Figure 1, two side by side portions e of the said yarn, constituted by the limbs of the additional loop 0, extend through the loop or bight to provide the greater security. For the sake of clarity in Figure 2, the modified knot is shown purely diagrammatically and in an opened-out condition; in practice, however, tightening of the knot results in the interengaged loops 5, b and e being drawn together so that the connected side by side portions e lie wedged together tightly within the loop or bight bwith the rounded connecting portion of the loop e protruding from the knot. The right-hand one of the straight side by side portions e prevents the knot, in the ordinary way, from being pulled inside out and untied. But by pulling the free extremity c of the shaded yarn y, the ad ditional loop e can be readily withdrawn from the knot to untie the same for the purpose hereinbefore explained.

But since, especially in a case where the joined yarns are to be incorporated into knitted fabric on a knitting machine, the presence of the protruding portion of the additional loop e could result in the knot becoming accidentially untied (e. g. as a consequence of the loop e being caught by a needle of the knitting machine), it will usually be preferred to cut through the said loop after tightening of the knot. As illustrated in Figure 3, the cutting of the additional loop disconnects the side by side portions or limbs e and results in the production adjacent to the knot of two further free extremities of yarn f and g which are innocuous so far as accidental untying of the knot is concerned. The right-hand portion e', although inthis case only short and detached from the yarn y, nevertheless is still enabled to function in the same manner as the. corresponding portion in the previously described example; that is to say, being wedged tightly in the loop or bight b of the yarn y it acts to prevent the knot from being pulled inside out and untied when subject to strain lengthwise of the joined yarns.

It is to be clearly understood that wherever, in the foregoing description and in the appended claims two yarns are referred to, e. g. the yarns y and y, these will not usually be two separate yarns but rather two ends of the same yarn. Two separate and even different yarns may, however, be tied together in the manner herein described.

I claim:

1. A weavers knot comprising loops of two textile yarns which are interengaged to produce a knob-like formation whereby the yarns are tied together, the extremity of each yarn passing outwardly through a loop of the other yarn with the two extremities extending from opposite sides of the said formation, and two side by side portions of the end of one of the two yarns extending through a loop of the other yarn to enhance the security of the knot.

2. A weavers knot according to claim 1, wherein the side by side portions of the said end of one of the two yarns are constituted by the two limbs of an additional loop which is interengaged with the said loop of the other yarn.

. 3. A weavers knot comprising loops of two textile yarns which are interengaged to produce a knob-like formation whereby the yarns are tied together, the extermity of each yarn passing outwardly through a loop of the other yarn with the two extremities extending from opposite sides of the said formation, and two side by side portions of the end of one of the two yarns, initially constituted by the limbs of an additional loop of the said yarn, extending through a loop of the other yarn, but this additional loop being cut so that the side by side portions are disconnected, thereby providing two further free extermities of yarn protruding from the knot and one of said side by side portions detached from the aforesaid end of one of the two yarns, said detached portion enhancing the security of the knot.

4. A weavers knot comprising a closed loop formation of a first yarn which is interengaged with an open loop formation of a second yarn, an extremity of each yarn extending outwardly through the loop of the other yarn with the extremities protruding from opposite sides of the knot, the end portion of the said first yarn being constituted by an additional loop having side by side limbs which pass through the open loop formation of the second yarn, to enhance the security of the knot.

5. A modified form of the weavers knot claimed in claim 4, wherein a protruding portion of the said additional loop initially connecting the side by side limbs is cut to produce two further free extremities of yarn and also to detach one of said limbs from said first yarn, this detached limb being wedged in the knot to enhance the security thereof.

6. A method of producing a weavers knot by which two yarns are tied together, which method includes the steps of interengaging a closed loop formation of one of the yarns with an open loop formation of the other yarn, drawing an additional loop of the yarn having there in the closed loop formation through the said open loop formation and tightening the knot, the said additional loop being retained in the knot during tightening of the same.

7. A method of producing a weavers knot according to claim 6, which includes the further step of cutting the additionally drawn loop after the knot has been tightened.

References Cited in the file of this patent Encyclopedia of Knots and Fancy Rope Work (Graumont and Hensel), published by Cornell Maritime Press (New York) 1945. Plates 7 and 38.

The Ashley Book of Knots (Ashley), published by Doubleday and Company, Inc. (New York), 1946, page 262,

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