US1604075A - Rope strand - Google Patents

Description

Cet. 19 1926. Y l,604,075

F. RIESENBERG ROPE STRAND Filed Jan. 28; 192e WITNESSES 1N VENTOR L ATTORNEYS Patented oci. 1e, 192e.'

UNITED STA TEs PATENT oFF I C E This invention relates generally to ropes and has particular reference to strands from which v,ropes are produced.

Hitherto, ropes have been built up from 5 strands com risin a core or body and a covering there or. uch t pe of rope strand has been found faulty ue to the fact that the fibers which make up the core or body of a strand areY too loosely'laid to afford the desired degree of durability anddepend almost entirely upon the covering yarns for compactness. In lsome cases the fibers are laid in arallelisrn, while the yarns of the cover o a 'core formed of the fibers laid in l5 parallelism is not capable of aiding in taking up the tractional ortensile 'strains or stresses.

Furthermore in this type of rope strand it is difiicult to repairthe same when the core or body of the rope strand breaks, since it is almost im ossible to s lice the core due to the sprea out condition of the fibers. It has also been `found that the rope strands do not have the necessary longitudinal elasticity due to the inequality in the elasticity of the core or body of the strand compared with that of its covering. It has been contemplated to overcome this draw-back by twisting together a bunch of fibers to roduce the strand core or body, but the' ers $0 are twisted to such an extent as to weaken the structure of the strand. y

The present invention 'contemplates a strand which in itself has the desired elasticity and flexibility and in which its cover aids th'e core or body of the strand in takin g up tractional or tensile strains or stresses so as to be of greater durability. To this end two or more unspun runs of fiber are loosely twisted to constitute what is to be known as a hand. A core or bod :is then formed of a.number ofA hands w ich are placed or twisted together so-that each hand is in contact-.with adjacent hands and no others. The core body so formed is then covered `with the usual covering yarns tol complete the strand. Any number of the strands so constituted are laid in the usual wav to constitute a ro e.

The nature of the mvention and its distinguishing features will ap ar when the following specification is rea in connection with the accompanying drawing, in which- Figure 1 is a view 1n elevation of a rope strand made in accordance with the present invention and showing the cover yarns untwisted in part to show the strand body whose hands are also untwisted inpart.

Fig. 2 is a transverse section'alview taken on the line 2-2 of Fig. 1.

The rope strand comprises a core or body 10 and a covering 11 for the core or body 10.--111 producing the core or body 10, bunches of unspunV fibers are loosely twisted together to constitute a hand 12.... In the present instance the fibers of the hand are twisted together in a righttwist. .Any preferred number of hands 12 are then fed to a former whichv twists the hands together loosely in a left twist to form the stand core or body. On reference to Fig. 2, it will be apparent that each hand is in contactwith adjacent hands, and owing to the number of hands used each hand is in contact with three other hands. This condition results and is maintained bythe covering 11 which .may be of any preferred form. In the present instance the covering 11 is constituted of yarns 13 spirally laid about the core or bo y 10 to completely envelop the core or body. The helices of the coverin yarns are disposed left handed. Three or our of the strands so constituted are then laid to form a 4rope which will be of 'greater durability and a more secure structure, owing vto the intertwining yof a lurality of hands of unspun fiber all wor ing` to ether and yielding naturali to the rope eiter over sheaves or around itts and the like.

It should be obvious from the foregoing, that a strand core or body constituted of hands loosely twisted together of unspun fibers will afford a certain amount of elasticity and will therefore be aided or supplemented by the covering in taking up the tractional or tensile strains and stresses to maximize the strength of the strand; the covering thusadding durability to the ro strand as well as serving for compacting t e .strand core or body; and that such a strand may be readily repaired in the event that it parts or becomes -broken due to the fact that theindividual hands may be easily spliced in the usual manner.

I claim: t

1. A rope strand comprising a strand body and a covering therefor, said body com rising hands of loosely twisted unspun fibers, said covering comprising spun yarns spirally laid about said body, the hands constituted of fibers being twisted in one and the same l direction, the hands being twisted in a twist opposite to the twist of the fibers of the hands, and the yarnsof the covering being twisted in a twist similar to the twist of said hands.

2.. A rope 'strandcomprising a strand body and a covering therefor, "said body comprising hands of loosely twisted nnspun fibers,

yrally laid about said body, each hand consaid covering comprising spun yarns spi- 10 stitu'ted of berstwisted in a right twist, the hands being twisted 'in a left twist, and the yarns of the covering being twisted 1n.

va left twist.

FELIX' RIESENBERG.

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