US2359424A

US2359424A - Rope sling

Info

Publication number: US2359424A
Application number: US459155A
Authority: US
Inventors: Robert F Joy
Original assignee: Bethlehem Steel Corp
Current assignee: Bethlehem Steel Corp
Priority date: 1942-09-21
Filing date: 1942-09-21
Publication date: 1944-10-03
Anticipated expiration: 1961-10-03

Description

oct. 3, 1944.A

R. F. JOY 2,359,424

ROPE SLING Filed Sept. 21, 1942 4 Sheets-Sheet l R. F. JOY v ROPE SLING Oct. 3, 1944.

Filed Sept. 2l, 1942 4 Sheets-Sheet 2 ffy- Oct.- 3 1944. R, F JOY 2,359,424

ROPE SLING Filed Sep't. 21, 1942 4 Sheets-Sheet 3 MNMM,

hw www Nw Md w wf oct. 3, 1944. l

l MM

N I! 11 wir 511, W 111161411 .11111111 Q me R. F. JOY v ROPE SLING Filed sept. 21, 1942 4 Sheets-Sheet 4 Patented Get. 3, 1944 ROPE- SLING Robert F.v Joy, Bethlehem, Pa., assigner to Bethlehem Steel Company, a corporation of Penn- Sylvania Application september 21,1942, serial No. 459,155 7 Claims. (o1. s'i-s) My invention relates to a rope sling and particularly to the method of making'it.

One of the objects of my invention is to provide a method of forming a wirev rope sling from a single endless unit.

Another object of my invention is to provide a method of forming a multi-part wire'rope'slin'g from a single wire rope spliced to constitute a single endless unit.

Anothe'robject of th invention is to provide, by my method, a sling of great lifting capacity and high' tensile strength. Y Y

Another object of my invention is to provide, by my method, a non-spinning; non-kinking sling which has great exibility,

The novel features of my inventionv will be more fully understood from the following specification and claims, taken with the drawings in which: Y

Figure 1 is a plan view of a section of an eight part sling made in accordance with my invention;

Fig. 2 is a plan view similar to Fig. 1 in which another side of the same sling is shown;

Fig. 3 is a plan View of a completesling made in accordance with my invention;

Fig. 4 is an end view of the section of sling shown in Fig. 1;

Fig. 5 is a plan view showing diagrammatically the rope folded preparatory to interweav'ing an eight part sling;

Figs. 6 to 13, inclusive, are plan views showing diagrammatically the method of interweaving an eight part sling; l

. Fig. 14 is a plan view showing diagrammatically the rope folded preparatory to interweaving a six part sling;

Figs. 15, 16, 17 are plan views showing diagrammatically the method of interweavin'g a six part sling; l

Fig. 18 is a plan view of a section of a siX part sling made in accordance with my invention;

Fig. 19 is an end View of the six part sling shown in Fig. 18;

Fig. 20 is a plan view of an eye-forming block with the rope mounted thereon preparatory to interweaving;

Fig. 21 is a side view of the rope and eye-forming block shown in Fig. 21; and

Fig. 22 is an enlarged plan view of the eyeforming block shown in Fig. 21.

Referring now more particularly to Figs, 5 t0 13 inclusive of the drawings, I show a rope in the various stages of being interwoven into an eight part sling. An elementary strand 25 is folded upon itself to provide eight body members 26, 21,

tionship.

28,29, 3U,` 3l, 32,l and 33 with four

loops

34, 35, 36, and 31 at one end and three

loops

38, 39 and 40 and two free ends 4I and 42 at the other end. It should be noted that no twisting of the separate loops is employed prior to interweaving. The free ends 4| and 42 can be spliced together as shown in dotted lines Fig. 5 either before the start or at the finish of the making of the sling. Temporary seizing may be applied preferably near the 'end having the two free ends 4I and 42 or splice to position the loopsin their proper rela- Instead of applying seizing, the splice end may be passed over an eye-forming block 43 as shown in Figs. 20 and 21 and secured thereto by means of wires 44 or other locking means which pass through holes 45 in the said block. The interweaving is started by twisting the outer right-hand loop 31 in a counter-clockwise direction so that body member 33 overlays body rrl'ernber 32 and then passing loop 31 through the two center loops, first through loop 36 and then through loop 35. This step is shown in Fig. V6, loop 31 being now the left center loop. The left outside loop 34 is then given a twist in a clockwise direction', body member 26 overlaying body member 21, and is passed through loop 31. This step isV shown in Fig. 'l where it will be noted that loop 31, the original right outside loop, has now passed through two loops 35 and. 35, has straddled one loop 34 and is now the left outside loop. The original left outside loop 34 has passed through one loop 31 thus moving one position to the right. The above procedure is repeated, that is, the right outside loop is twisted ina counter-clockwise direction, passed through the two center loops and then Vstijaddles the oppositely twisted left outside loop. Figs. 6 to 13 illustrates a complete cycle, that is, the loops are traced through their various' steps until they are in their original positions. This process is continued until a point has been reached where just enough of the loops remain to form eyes. The end loops or eyes are fastened together preferably wth ne wire serving which binds them in a compact form and makes a single loop into which a thimble may be inserted. It will be noted that as each loop becomes the outer right hand loop it is given a twist in a counterclockwise direction before it is threaded through the two center loops; as it becomes the outer left-hand loop it is given a twist in a clockwise direction before threading it through the left center loop. By thus reversing the direction of twist on each operation, there will be no tendency imparted to the finished sling to twist upon itself and loops will remain free of twist throughout weaving.

Referring now to Figs. 14 to 1'1 inclusive, I show diagrammatically my method of interweaving as applied to a six part sling. An elementary strand 4B is folded upon itself to provide six

body members

41, 48, 49, 50, 5|, 52 and three

loops

53, 54, 55 at one end and two

loops

56 and 51 and two

free ends

58 and 59. The

free ends

58 and 59 can be spliced together as shown in dotted lines in Fig. 14 either before the start or at the finish of the making of the sling. Seizing is applied preferably to the end having the two free ends or splice, or instead of seizing the splice end may be passed over an eye-forming block 43 (Fig. 20) in the same manner as in making the eight part sling described above. Interweaving is started by rotating center loop 54 in a clockwise direction, body member 49 overlaying body member 50 and passing it through right outside loop 55 as shown in Fig, 15. This step positions loop 55 in the center whereupon it is rotated in a counterclockwise direction, body member 52 overlaying body member 5|, and passed through left outside loop 53 as shown in Fig. 16. This step positions loop 53 in the center whereupon it is rotated in a clockwise direction, body member 41 overlaying body member 48, and passed through right outside loop 54 as shown in Fig. 17. Each loop as it becomes the center loop is twisted either in a clockwise -or counter-clockwise direction, whichever is opposite to the twist imparted in the previous operation, and is passed either through the loop to the right or left, whichever direction is opposite to the direction of passing of the previous operation. This procedure is continued until just enough of the loops remain to form eyes.

My method of forming slings by passing one loop through an adjacent loop will produce a sling in which each member of al1 loops will be effectively locked against a member of an adjacent loop. Also my procedure of twisting each of the loops in one direction prior to passing it through an adjacent loop or loops and twisting it in the opposite direction when next passing it through an adjacent loop or loops will produce a completely flexible sling having no tendency to kink or twist upon itself.

It should be understood that my method of forming multi-part slings is not limited to six or eight part slings but can be used to make slings comprising various numbers of parts.

While I have shown my invention in a plurality of forms, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modications without departing from the spirit thereof, and I desire therefore, that only such limitations shall be placed thereon as are imposed by the prior art or as are specifically set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. The method of producing a multi-part flex ible sling which comprises folding an elementary strand to form a left outside loop, two center loops and a right outside loop, twisting said right outside loop, passing said right outside loop through said center loops, twisting said left outside loop, and passing said left outside loop through said right outside loop.

2. The method of producing a multi-part flexible sling which comprises folding an elementary strand to form a left outside loop, two center loops and a right outside loop, twisting said right outside loop in a counter clockwise direction and passing it through said center loops, and twisting said left outside loop in a clockwise direction' and passing it through said right outside loop.

3. The method of producing a multi-part ilexible sling which comprises folding an elementary strand to form two outside loops and two center loops, passing one of said outside loops through said center loops and passing the other outside loop through said first mentioned outside loop.

4. The method of producing a multi-part flexible sling which comprises folding an elementary strand to form a left outside loop, two center loops, and a right outside loop, passing said right outside loop through said center loops, and passing said left outside loop through said right outside loop.

5. A llexible multi-part sling formed from a single elementary strand, said sling comprising four interwoven loops, said loops comprising two body members having paired portions and divided portions, one loop having the paired portions of the body members disposed intermediate the divided portions of the body members of two adjacent loops, and having the divided portions of said body members disposed around the paired portions of the body members of the other adja-d cent loop.

6. A flexible multi-part sling formed from a single elementary strand, -said sling comprising four interwoven loops, each of said loops comprising two body members having paired portions and divided portions, one loop having the paired portions of the body members disposed intermediate the divided portions of the body members of two adjacent loops, and having the divided portions of said body members disposed around the paired portions of the body members of the other adjacent loop, and said body members having a twisted portion adjacent said divided portions.

7. A flexible multi-part sling formed from a single elementary strand, said sling comprising interwoven loops, each of said loops comprising two body members having divided portions and paired portions, the body members of adjacent loops being disposed intermediate said divided portions and around said paired portions and said body members having a twisted portion adjacent said divded portion.

ROBERT F. JOY.