US 883759 A
Description (OCR text may contain errors)
PATENTED APR. 7, 1908.
- 0. TKNGRING.
INVENTOR UNITED STATES PATENT OFFICE.
OLOF TANGRING, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO AMERICAN STEEL & WIRE COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF NEW JERSEY.
To all whom it may concern:
Be it known that I, OLOF TANGR NG, of Worcester, Worcester county, Massachusetts, haveinvented a new and useful Im rove ment in Wire Ropes, of which the fol owing.
is a full, clear, and exact description, reference being had to the accom anying drawings,
derricks. n the various operations which.
require the liftin of heavy loads, the use of a single rope attaclied directl to the load has long been considered desira le; but owing to the fact that with the. ordinary rope, as soon as the load is attached and is depending there from, the rope begins to rotate or s in, and consequently to unwind, the load becomes dangerous to handle and often unmanageable and the strain on the fibers of the-ropeis such that it is liable to break. 'Various forms of construction of wire rope have been produced to obviate this spinning or rotating movement, but the present invention is believed to be the first to overcome the difficulties above suggested, and to produce a flexible and smooth rope.
The construction of the r0 e is as follows:
An inner series of wire stran s 2 is wound in one direction over a core 3, and an outer series of wire strands .4 is ,wound about the inner series 2 as a core in the opposite direction. The wires which make u each of the individual strands 2 are twiste direction as the lay of the strands, but in the strands 4 the individual wires are laid in o osite directions to the lay of the stran s.
be number of strands required for the second or outer layer must of course be greater than the number of strands in the inner layer. For this reason, the inner layer has the wires as well as the strands all laid in one, direction, as described, thereby giving them a tendency to untwist very much faster than if they Specification of Letters Patent.
Application filed. October 4, 1907. Serial No. 895,916.
in the samev Patented April 7, 1908.
were twisted in the o osite direction to the lay of the strands. e wires inthe outer layer being laid in an opposite direction to the lay of thestrands do not tend'to untwi'st as fast as in the inner'layer; The strands in the outerlayer, however, counteract the tendency of untwisting of therope as a whole. When a weight is applied to the end of the rope, the greater number of strands vof the outer layer have a tendency to untwist in one direction, whereas the fewer strands of the inner layer have a tendency to untwist ver much faster in the op osite direction, and it is found in practice t at these two actions almost perfectly balance each other.
The core 3 ispreferably made of hemp,
but any suitable material or metal may beused. Any desired number of wires may be used in each strand, and the core may be omitted. The number of strands in the ro e depends on the size, uality and the use or which it is made,- a arge number of small strands giving'a much smoother and more flexiblerope than a smaller number of larger strands. In the drawing, I have shown the inner layer made up of S12: strands composed each of seven wires, and the outer layer is made up oftwelve strands com osed each of seven wires, butit is to be un erstood that these drawings are more or less'dia am maticin character, and it is not intende that they should re resent the exact proportions and relations, or these proportions and relations may vary widely with the conditions'of the Workto be performed.
I claim: w
1. A wire rope having an inner series of strands wound in one direction, and an outer series of strands wound about the inner series as a core in'the' opposite direction, each of said stra1ids being composed of a plurality of wires, the Wires of the inner series being twisted or laid in the same direction as the lay of the strands in such series, and the wires of the outer 'seriesbeing laid in o posite directions to the lay of the stran s in such series, substantially as described.
2. A wire rope having an inner series of strands wound about a core in one direction,
an outer series of strands Wound about the inner series as'a core 1n the opposite dlrection, each of sald strands being composed of a plurality of wires, the wires of the inner having their individual wires laid in the same series being twisted or laid in the same direcdirection, substantially as described. 10 tion as the lay of the strands in such series, In testimony whereof, I have hereunto set and the wires of the outer series being laid in my hand, 5 opposite directions to the lay of the strands OLOF TANGRING.
in such series, substantially as described. Witnesses:
3. A wire ro e composed of two layers of A. F. BAdKLIN,
strands woun in opposite directions and WM. A. BACON.