US3490106A

US3490106A - Cable attachments

Info

Publication number: US3490106A
Application number: US726863A
Authority: US
Inventors: Hans O Dohmeier
Original assignee: Individual
Current assignee: Individual
Priority date: 1968-05-06
Filing date: 1968-05-06
Publication date: 1970-01-20
Anticipated expiration: 1987-01-20

Description

1970 H. o. DOHMEIER CABLE ATTACHMENTS Filed May 6, 1968 IPA/SW02 Hal-4s Om :Dw-Msum/ Mme mm United States Patent 3,490,106 CABLE ATTACHMENTS Hans O. Dohmeier, 30 Van der Merwe St., Hillbrow, Johannesburg, Transvaal, Republic of South Africa Filed May 6, 1968, Ser. No. 726,863 Int. Cl. F16g 11/02; F16b 7/00; E04h 12/20 US. Cl. 24-123 8 Claims ABSTRACT OF THE DISCLOSURE This invention relates to cable attachments whereby wire rope slings may be formed or ancilliary equipment secured to the ends of such ropes.

Wire rope slings are very widely used throughout industry and such wire ropes also often have ancilliary equipment secured to the ends thereof. One such latter instance is in the anchor bolt assembly for a flexible supporting eye in underground mining operations.

Generally slings are made by splicing the wire rope which, While very effective in use, is an extremely laborious and time consuming method of manufacture. The use of aluminium alloy collars around the wire rope and swaged thereon has also been used with considerable success but such sleeves are also expensive and require considerable swaging pressures.

In an endeavour to find alternative constructions to obtain the desired results in a less expensive and speedier manner it has been found that contrary to expectations a particular material has proved most effective.

In accordance with this invention there is provided a wire rope attachment means comprising a collar of malleable cast iron.

It will be understood that the term malleable cast iron is used in this specification to include spheroidal graphite cast iron and other cast metals having similar physical properties but in particular includes both blackheart and whiteheart malleable iron.

The invention also provides a method of forming attachment means on wire ropes comprising forming a loop at the rope end, threading the rope and the folded back end thereof in an oval shaped collar of malleable iron and swaging the collar to secure the loop at the end of the wire rope.

A preferred form of this invention will be described below with reference to the accompanying drawings in which:

FIG. 1 is a sectional elevation of the collar,

FIG. 2 a plan of the collar,

FIG. 3 a sectional view of an alternative wall shape of the collar,

FIG. 4 a view of the collar swaged onto a wire rope to form an eye, and

FIG. 5 a section on line AA in FIG. 4.

As shown the end of a wire rope sling 1 is manufactured by' the casting in malleable iron of a collar 2 having an oval shaped periphery 3 and bore 4. The latter is of a size so that the collar 2 may be slipped over the folded end 5 and adjacent portion 6 of the wire rope when the rope is prepared to form the sling eye 7 at one or both ends.

From FIG. 2 it will be seen that the bore through the collar carries oppositely disposed longtiudinally extend ing rounded protrusions 8 centrally located in the bore 3.

3,490,106 Patented Jan. 20, 1970 These facilitate the complete binding of the collar to the wire rope when swaged as described below.

FIG. 3 illustrates the tapering of the walls of the collar and this is done to show a simple manufacture as such castings are easier to withdraw.

With the collar 2 in position a simple swaging operation is effected to bring the collar to a substantially circular shape and swage it onto the two parts of the rope. As a result of this operation two surprising results are achieved. Firstly it is found that, at insofar as collars for wire ropes of up to diameter are concerned, less effort is required with the malleable iron collar to effect the swaging than is necessary with an equivalent known form of aluminium collar and secondly the iron deforms very effectively into the intersticies between the outer strands of the rope and rope part to give a highly satisfactory locking of the rope parts into the desired eyeshaped end.

Another satisfactory application of the use of a malleable cast iron collar is in the attachment of the shank of an anchor bolt assembly to a cable end for securing a cable to a rock face. It has been found that such a collar can be made integral with part of the anchor bolt assembly and may be readily swaged onto the end of the cable to form a very firm attachment therewith. Such an arrangement is also particularly satisfactory where recoverable roof bolt assemblies are used in mining operations.

More particularly it has been found that collars made of either blackheart or whiteheart malleable iron can be used very satisfactorily though the collar of whiteheart malleable iron can be made shorter than that for a collar of blackheart material for the same strength.

For an eye to be formed on a standard A2" diameter wire rope a collar of B58 310 grade 22/14 blackheart malleable iron is made to a length of 1%" and has an oval bore therethrough the larger dimension of the bore being 1 and the smaller dimension being The wall thickness of the collar is made It is found that when this collar is in position and swaged down to an outside diameter of for practical purposes 7 and length of 2 then, under test, the strength of joint was found to exceed the tensile strength of the cable. The swaged length of the collar can vary a limited amount depending on the hardness of the cable and collar material.

With a collar of B58 309 Grade 1 whiteheart malleable iron for the same purpose was found to require a length of only 1%" to give the same strength when the other dimensions were also kept the same as those for the blackheart iron.

The invention provides means whereby wire rope slings and other attachments to wire ropes can be very inexpensively manufactured while maintaining all necessary physical requirements for such articles.

It is also found that the collar is effective with both solid or fibre cored wire ropes.

What I claim as new and desire to secure by Letters Patent is:

1. A wire rope attachment means comprising a collar made from malleable cast iron, said collar being substantially oval in cross section with the outer surface defined by straight side portions and semi-circular end portions, said collar having a smooth-walled bore therethrough, the contour of said bore substantially following the contour of the outer surface but with oppositely disposed longitudinally extending rounded protrusions provided down the central part of the straight sided portions defining thickened Walls of the collar at the straight sided portions, said collar cross-sectional shape being constant throughout the length of the collar, and said thickened walls and said semi-circular ends of said collar causing said collar when swaged onto a wire rope passed through its bore to have a smooth circular crosssection at its outer surface with the inner surface being deformed into and around the wire rope passed through its bore.

2. A wire rope attachment means comprising a collar made from malleable cast iron, said collar being substantially oval in cross section with the outer surface defined by straight side portions and semi-circular end portions, said collar having a smooth-walled bore therethrough, the contour of said bore substantially following the contour of the outer surface but with oppositely disposed longitudinally extending rounded protrusions provided down the central part of the straight sided portions defining thickened walls of the collar at the straight sided portions, said collar gradually diminishing at the outside diameter from one end to the other whereby the collar outer surface is tapered toward one end, and said thickened walls and said semi-circular ends of said collar causing said collar when swaged onto a wire rope passed through its bore to have a smooth circular crosssection at its outer surface with the inner surface being deformed into and around the wire rope passed through its bore.

3. A wire rope attachment as claimed in claim 1 in which the collar is made from whiteheart malleable iron. 25

which the length of the collar is more than twice the diameter of the wire rope with which it is to be used.

6. A wire rope attachment as claimed in claim 2 in which the collar is made from whiteheart malleable iron. 7. A wire rope attachment as claimed in claim 2 in which the collar is made from blackheart malleable iron. 8. A Wire rope attachment as claimed in claim 2 in which the length of the collar is more than twice the diameter of the wire rope with which it is to be used.

References Cited UNITED STATES PATENTS 291,693 1/1884 Cole. 2,327,683 8/1943 Warner. 2,945,457 7/ 1960 Avery 17479 X 3,204,310 9/1965 Rohland.

FOREIGN PATENTS 749,597 1/1967 Canada.

770,849 11/ 1967 Canada.

728,820 12/ 1942 Germany. 1,029,200 4/ 1958 Geritiafiy.

BERNARD A. GELAK, Primary Examine? US. Cl. X.R; 287-78