US2083369A - Stone sawing strand - Google Patents

Description

June 8, 1937. G. G. GREENE STONE SWING-STRAND Filed May 3, 1.955

, strand Patented June s, v1937 UNITED STATES h 2,989,369 s'roNE sAwlNG STRAND Guy Gilbert Greene, San

signor to The American Steel and 'pany oi'. New Jersey, a corporation of Jersey Francisco, Calif., as-v Wire Com- New Application May a, i935, serial No. 19,122

2 Claims. (Cl. 117-55) This invention relates in general tothe wire rope art, and is particularly concerned with stone sawing strand, one of thev objects being to effect an increase in the security of splicings in any made of a plurality of intertwisted wires. A splicing in such a strand is commonly made by unraveling both ends to be joined for distances thought to be sucient in view of the tension to be carried, the unraveled wires..then `being arranged so that alternatewires of one end are substituted 'for similarly laid Wires of the other end and vice versa. The wires areall closely iitted into place and their ends trimmed intor close abutting relationship and so that the the abutting ends of the others.

The resistance to slipping of-such splicing is dependent on the frictional resistance of the valrious wires which must slide, and the torsional resistance of the various wires to the torque set up by their sliding through the helical paths resulting from their intertwisted relationship. These yfactors are both variable, and slippage in splicing Ais therefore all too common. Slippage is especially prevalent in stone sawing strand splicings because of the three-wire construction of such strand. l Now the present `invention covers a strand made of a plurality of wiresthat are intertwisted with a lay of varied pitch. At the present time it is believed best that the lays should be of alternately short and long pitch. This lay changes' in pitch at such spacing along the strand as enables splicing to include at least one change in'pitch. A spliced strand made in this manner should have a splicing wherein at least one o f the abutting ends of the respective wires of which the strand is made are oil- `s`et from the abutting ends of 'the others, this 40 resulting naturally from conventional splicing, and the lay of the strand will change in pitch at least once in this splicing. .The result of all this is vthat slippage of the splicing is retarded, due to the fact that the Wires must follow helical paths of different pitch when they slip relative to each other so that the values of both. factors mentioned are increased.

Specic examples of the above are illustrated by the accompanying drawing, in which Figure 1 shows a stone sawing strand of thecharacter described, with a conventional splicing that is unraveled so that it can be studied; Figure 2 xshows the splicing in its assembled form; and Figure 3 shows a strand embodying theprinciples 1 55 described4 b'ut 'reverseiy laid.

ly numbered I, 2 and then substituted for abuttingl ends of alternate wires are oiset from In the'drawing above described, the three intertwisted wires may be respectively identified by the two diierent cross`hatchings and by the absence of such hatching. They are respective- Figure 1 shows that the splicing in this strand is made by unraveling the three wires of the respective ends for considerable distances, which in actual practice are ordinarily about ten feet in length. The wire 2 of the right-hand end is the same wirein the lefthand end, while the wire lof the left-hand end is substituted for the same wire in the righthand end, the Wires 3 meeting in abutting relationship at the center of the splicing. The increased resistance to slipping in this splicing has already been explained. Also, as previouslsr explained, `this results from the wires being intertwisted with a lay of varied pitch, the lines drawn. at 'right angles to the strand and respectively marked S and L showing that the strand is'of alternately short-and long pitch.

Figure 2 shows the splicing assembled, the lines marked S and L indicating 'that the lay of the strand changes in pitch at least four times at the splicing. This figure also shows that the abutting ends of the alternate wires are offset from the abutting ends of the others, this, however, simply 'resulting from the conventional splicing. l

Figure 3 is included for the purpose of showing that the principles of the invention may be applied lto reverse-lay stone sawing strand. It is obvious that it may also be applied to a leftlay stone sawing strand. l

Although a, stone sawing strand has been disclosed to provide a specific example as required by the patent statutes, it should be' understood that the invention is applicable in general to the wire rope art, and the scope of the following claims should not .be limited exactly to this specic example.

I claim: l

1. A pluralityV of Wires intertwisted to provide strand ends, alternate ones of said wires of one of said ends being substituted for alternate ones of the other to form a splicing, theends of said wires being arranged in abutting relationshipv and so that -the abutting ends of at least some of said: wires are oiset from the abutting ends -of others, said wires lbeing intertwisted in the same direction with a lay that changes in pitch at least at said splicing, whereby said wires must travel through helical paths o f different pitches before said splicing can be pulledapart.

' at least some Voi? said wires are oiiset from the others,said wires being inter-twisted in the same direction at least at said splicing and having a lay that changes in pitch at least at said splicing, whereby said wires must travel through helical paths of different pitches before said splicing can be pulled apart. i

GUY- GILBERT GREENE.

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