US2570576A - Belting - Google Patents

Description

W. LORD Oct. 9, 1951 BELTING 2 Sheets-Shea?l l Filed May ll, 1946 INVENTOR ///LFP/o L o/PD Emy: QTM ATTORN EY Oct. 9, 1951 W LORD 2,570,576 i BELTNG Filed May l1, 1946 v 2 Sheets-Sheet 2 Patented Oct. 9, 1:1951

BELTING Wilfrid Lord, Rochdale, England, assigner to Dunlop Tire and Rubber Corporation, Bualo, N. Y., a corporation of New York Application May 11, 1946, Serial No. 669,181 In Great Britain May 19, 1945 4 Claims.

My invention relates to belting consisting of a combination of woven textile fabric and rubber or the like, such as is employed in connection with conveyor, elevator or power transmission installations. More particularly this invention is concerned with belting having a single ply of woven textile fabric.

In the design of belting for heavy duty there is in practice a limit to the weight and therefore strength to which plain woven fabric can be made by merely increasing the coarseness of the Warp and weft threads and there is a limit likewise to the number of plies that can be advantageously combined to form belting. Moreover any serious damage to the surface of a belt that is caused by heavy impact or severe wear may result in a maj or breakdown of the belt and the liability is increased when it is desired to employ only a single ply of textile fabric.

The object of the present" invention is to provide belting having a ply or plies of woven textile fabric which has long life and adequate strength for heavy operative conditions and is adapted to withstand damage and abrasive wear in service.

According to this invention belting for conveyer, power transmission or the like installations comprises at leastV one ply of woven textile fabric having one set of weft threads and two sets of warp threads, the weft threads being relatively straight transversely of the belt and the warp threads interlacing the weft threads in such a manner that the warp threads of one set surface on one side only of the fabric to provide a doublefaced construction of the fabric.

Furthermore, according to this invention belting for conveyor, power transmission or the like installations comprises at least one ply of woven textile fabric having one set of weft threads and two sets of warp threads, the weft threads being relatively straight transversely of the belt and the warp threads of one set alternating with the corresponding threads of the other set and interlacing the weft threads in such a manner that the warp threads of one set surface on one side only of the fabric to provide a double-faced construction of the fabric.

The double-faced construction of woven textile fabric for incorporating in belting according to this invention, may be accomplished by any of several weaves. YAny weave which will give the effect which is known in the textile trade as warp faced on both sides may be suitable. That is to say, the weave must be such that there are closely spaced warp floats, produced by the warp threads, being woven in two distinct layers interlaced by the weft, so that the warp oats appear on both sides of the fabric. Almost any twill weave will produce this effect, either a straight twill or a broken twill, and it may be 2 up 1 down, 3/1, 4/1, 5/1 etc. It must be borne in mind, however, that the greater the number of picks covered by one float, the more diiiicult it becomes to weave, since more shafts are required in the loom. Moreover, the longer the floats, the looser the texture obtained, Whereas a close tight texture is required to give adequate fastener anchorage. It is for this reason also that a broken twill weave is preferred to a straight twill, since a broken twill, while giving the same length of warpoat, results in a greater binding effect owing to the continual change of the twill direction. For example, a broken twill Weave may be employed for each layer of warp, the warp threads in the upper face being lifted over three consecutive weft threads and passed under the fourth weft thread, whilst the warp threads in the lower face are lifted over one weft thread and are lowered to pass under the next three consecutive weft threads. The points of interlacing of bothwarp layers with the weft are so arranged as to allow the warp threads to pass freely to their respective layers. One weave for one warp layer is woven on odd warp threads whilst the weave for the other warp layer is woven on even warp threads, but both weaves are caused to interweave with the same weft so that the combined 'weave repeats on eight warp threads and four weft threads, thus producing a single ply of fabric.

In order that the invention may be more clearly understood and readily carried into practical effect reference is made, in further describing the same, to the accompanying drawings wherein:

Fig. 1 is a diagrammatic side view of a sample portion of a woven textile fabric for belting according to this invention.

Fig. 2 is a diagrammatic plan view of the portion of woven textile fabric shown in Fig. 1.-

Fig. 3 is a view similar to that of Fig. 2 but illustrating a modified weave.

Fig. 4 is a view similar to that of Figs. 2 and 3 but illustrating a further modified weave.

Fig. 5 is a perspective view showing the woven textile fabric of Figs. 1 to 4 combined with rubber to form a rubberized belting, a part of the rubber being cut away to show the fabric.

Referring to the drawings Figs. 1 and 2 show a textile fabric wherein the weave is three up and one down repeating on eight ends and four picks, the said fabric having two sets of warp threads l, 2, interlacing with one set of weft 3 threads 3 in such a manner that the warp threads I surface on one side only of the fabric and the warp threads 2 surface on the other side only of the fabric to provide a double-faced construction of the fabric.

Fig. 3 illustrates a textile fabric wherein the weave is .two uptand one downrepeating on eight ends and three picks, the two sets of warp threads l, 2, interlacing with the weft threads 3 so that the warp threads l surface on one side only of the fabric and the warp threads 2 surface on the other side only of the fabric.

The textile fabric illustrated in Fig. 4 is Awoven five up and one down repeating on twelve ,ends and six picks and the two sets of warp threads l, 2, again interlace with the weft threads 3 so that the warp threads I surface on one side only of the fabric and the warp threads 2 surface on the other side of the fabric.

The fabric, such as described above, may be combined with rubber in .any suitable way as, for example, by embedding the fabric -in ,and between the surface layers 4 of rubber or similar composition.

In belting according to this invention wherei a single ply of woventextile fabric has the warp threads arranged in two layers as above .described, only half of the warp threads, which bear the longitudinal pull, are close to the load carrying surface of the belt, and hence are liable to damage or abrasive action due to wear. Such a weave also permits a heavier and `stronger textile vfabric' to be woven than is possible with a plain weave. Further, fabric woven in accord-- ance with this invention hasl a surface which is of a uniformity or'regularity similar to that of conventional belting .duck and can therefore be processed with rubber or the like by the same methods, thus eliminating difculties of processing' y associated with plainY woven fabric of heavy construction.

' `Having described my invention, what I claim 1. Reinforced rubber belting having rubber combined with a textile fabric, said fabric hav.- ing weft threads and two sets of warp threads; each thread of one set of warp threads extending over a group of weft threads, under asingle weft thread, and over another group of weft threads, adjacent warp threads of said one set extending under weft threads which are longitudinally 4 spaced; each thread of the other set of warp threads extending under a group of weft threads, over a single weft thread, and under another group of weft threads, adjacent warp threads of said other set extending over weft threads which are longitudinally spaced; the warp threads of the `two.setsbeing so arranged that at each point where a warp thread of said one Aset extends under a weft thread, such warp thread is located between said weft thread and a warp thread of the other set, and at each point where a warp thread of said other set passes over a weft thread, such warp thread .is located between said weft .thread and a warp of said one set.

2. The belting of claim 1 wherein each of said groups of weftthreads consists of two threads and the -weaye repeats on eight warp threads.

3. The belting of claim 1 wherein each of said groups o f weft threads consists of three threads and the Weave repeats on eight warp threads.

4. The belting Yof claim 1 Whereineach of 4said groups of Vweft threads consists of five .threads andthe weave repeats on twelve warp threads.

WILFRID L-QBD.. Y

REFERENCES crrED The following references are of record liii-,the file of this patent:

UNITED STATES PATENTS OTHER REFERENCE-s Staple Cotton Fabrics by Hoye; published in 1942 by McGrawfHill Book Co. of New York, page 87.

WeavesfFabrics Textile Designing by International Library of Technology; copyright A1906 by International Text VBook Co. of London. Section aad-pases 13 to 18.

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