US1218714A - Hoisting and similar sling. - Google Patents

Description

C. C. SUNDERLAND & R. D. GREEN. HOISTING AND SIMILAR SLING.

APPLICATION FILED MAR- 1913.

Patenfed Mar. 13, 191?.

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CHARLES C. SUNDERLAND AND RICHARD D. GREEN, OF TRENTON, NEW JERSEY, ASSIGNORS T0 JOHN A. R OEBLINGS SONS COMPANY, A CORPORATION OF NEW JERSEY.

HOIS'IING- AND SIMILAR SLING.

Application filed March 7, 1913. Serial No. 752,594.

To all whom 2'8 may concern.

Be it known that we, CHARLES C. sUNDER-' of Mercer, and State of New Jersey, have Specification of Letters Patent.

invented certain new and useful Improve.

ments in Hoisting and Similar Slings, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

The object of the present invention is to provide an improved sling, intended particularly for hoisting and handling girders, beams, and similar heavy building material in the erection of the modern high buildings and for anchor connections for derrick guys, but applicable generally for hoisting, anchoring and similar purposes. The especial object is to provide a strong and flexilt-le sling of such construction as to avoid danger of sudden breakage, convenient of inspection for detection of wear or weakness, and by which the hoisting and handling of heavy-loads may be rendered safe and the frequent serious accidents in constructing buildings with present slings be avoided. The desired results are secured by the sling Patented Mar. 13, 1917.

two loops of the bridle sling, each formed, as shown, of double wire rope having the two parts lying side by side so as to secure the' scribed and claimed in the Carnagy Patents No. 654,224 and No. 654,225, dated July 24th 1900, but rings formed or spliced endless in other ways may be used.

The hoist end eyes of the loops 10, 11 are preferably formed in the manner shown, in which the wire ropes pass around the grooved thimbles 15 and are held at the inner ends of the eyes by clamping rings or of the present invention, in which wire rope invention in preferred forms, and these slings will now be described in detail, and the features forming the invention then specifically pointed out in the claims.

In the drawings, Figure 1 shows a bridle sling embodying the invention.

Fig.v 2 is a cross section on the line 2 of Fig.1. Fig. 3 is a central sectionthrough the thimble on the line 3 of Fig. 2.

Fig. 4 is a side view of the hook gromet partly in section.

Fig. 5 is an edge view of the hook gromet. Fig. 6 is a cross section on the line 6 of 'Fig. 4.

Fig. 7 shows a column sling or anchor connection sling embodying certain features of the invention.

Referring to the drawings, 10, 11 are the s'queezers 16 inclosing the ropes and secured by rivets 1 passing through the rings and the inner ends of the thimbles 15. The rope is held in the thimbles by cars 2 formed on the thimbles and bent over the rope. The eyes at theload end may have their ropes held in the thimbles by the same means, but at the load end the preferred special form of the thimble is preferably used, thimbles 15 being formed with extended flanges 17 at I the outer ends of the thimbles to which are secured by screws 3 a separate clamping piece 18 grooved to receive the rope, a very strong and eflicient thimble thus being provided.

The'gromet 12 atthe hoisting end of the sling is preferably armored on the inner side by the curved steel plate or thimble 19, preferably formed in two or more parts, as shown, so as to permit elongation of the gromet under load strain, and the rope is held in place on this thimble or armor by K ears 4 similar to the ears 2 on the rope eyes.

The hook gromets 14 are formed to provide two eyes, one receiving and sliding upon the-loop 10 or 11, and the other receiving the hook 13, the construction shown and preferably used for this purpose'being as follows: The hook gromet isarmored on the innerside by a steel plate or thimble 20,

-' liability to parting grooved to receive the rope, this armor being in two parts divided at 5, asshown, to permit elongation of the gromet under load strain, and the two eyes are formed by clamping the gromet by grooved clamps 6 on opposite sides of the gromet, and a clamping ring or strap 7 extending about the clamps 6, and preferably secured by being shrunk on around the clamps.

It will be understood that in use, the separated ends of the two loops 10, 11 are passed around the load on the proper lines and the hooks 13 hooked into the eyes atthe load end of the loops, the gromets 14 sliding on the loops so as to hold taut around the load.

It will be seen that the invention provides a very strong and flexible sling for heavy loads in which the danger of sudden breakage is avoided, the wire rope yielding gradually and weakness or wear being readily detected before becoming such as to result in of the rope. The double rope secures great flexibility with the strength required, and equalization of tension on the two parts is secured by the slip of the rope around the thimbles. This equalization is better secured and greater strength obtained, by forming or splicing the rope endless, as shown, with both ends of the loops free to slip on the thimbles, but it will be understood that the rope may be socketed or otherwise secured to the thimbles at one end of the loop and free to slip only at the other end. The double rope also aids in preventing twisting of the sling under load, and the rope-may be made of any nontwisting form, if desired, for the same purpose. While the hooks 13 are preferably carried by the gromets 14, and hook into the eyes at the load end of the loops, this may be reversed, and the hooks be carried by the loop eyes and hook into the groniets 11 sliding on the loops, within the broader features of the invention. Other modifications with- *in the invention will suggest themselves to those skilled in the art.

In Fig. 7 there is shown a column sling formed of a double rope 21 in the same manner as one of the loops 10, 11 of the bridle sling of Fig. 1, the eye at the load end of the column sling being of suflicient size to permit the other'eye to pass through it, so that the load is held in a loop formed in the sling itself, without any hook, as in the present form of column slings made of chain. The

construction of the thimbles used on this column sling may be and is shown as the same as on the bridle'sling previously described, so that the same reference letters are used on corresponding parts in the two slings. This column sling also forms an eflicient anchor connection sling for derrick guys and the like.

What is claimed is:

1. A sling having a loop formed of double wire rope with its two parts side by side, and provided with eyes at each end, and a wire rope gromet sliding on the loop and clamped to form two eyes, one inclosing the loop and the other carrying or receiving the hook to connect the eye at the load end of the loop with the gromet, said gromet being provided with a metal thimble or lining '20 and clamped by clamps 6 and clamping ring 7.

.2. A bridle sling having two loops each formed of double wire rope with its two parts side by side, andprovided with eyes at each end, metal thimbles inside the eyes secured upon the rope so as to permit equalization of the tension on the two parts of the loop, and a wire rope gromet uniting the eyes at one end for the hoist or other connection.

3. A bridle sling having two loops, each formed of double wire rope with its two parts 4. A bridle sling having two loops, each formed of double wire rope with its two parts side by side, and provided with eyes at each end, metal thimbles inside the eyes secured upon the rope so as to permit equalization of the tension'on tlie two parts of the loop, a wire gromet uniting the eyes at one end of the sling for the hoist or other 'connection, said wire gromet being provided with an inner metal thimble or lining, and a wire gromet sliding on each loop and clamped to form two eyes, one inclosing the loop and the other carrying or receiving the hook for connecting the eyes at the load ends of the loops with the sliding gromet.

5. In a sling, the wire rope gromet 1 sliding on the sling loop, and clamped by clamps 6 and clam ing ring 7 to form loop inclosing and hooz carrying or receiving eyes.

6. In a sling, the wire rope gromet 14 sliding on the sling loop, and clamped by clamps 6 and clamping ring? to form loop inclosing and hook carrying or receiving eyes, and having the inner metal thimble or lining 20.

In testimony whereof, we have hereunto set our hands in the presence of two subscribing witnesses CHARLES C. SITNDERLAND. RICHARD D. GREEN. \Vitnesses:

SAM E. WILSON, HARVEY Coonnr.

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