EP0032749B1

EP0032749B1 - Loop, and a strap or sling made therefrom

Info

Publication number: EP0032749B1
Application number: EP81100420A
Authority: EP
Inventors: Karl Moritz Raue; Hans-Otto Von Danwitz
Original assignee: Spanset Inter AG
Current assignee: Spanset Inter AG
Priority date: 1980-01-21
Filing date: 1981-01-21
Publication date: 1983-09-21
Also published as: ES8200057A1; JPS57500020A; JPS6135115B2; DK148389C; GR73539B; FI812227A; WO1981002151A1; NO813176L; DK415881A; CA1153037A1; US4421352A; AU542731B2; CA1153037A; FI71913C; DK148389B; FI71913B; AU6706981A; FI812227L; ES498709D0; ES498709A0

Description

The invention relates to a round sling or endless sling of the type previously described in the preamble of claim 1 and known from DE-B No. 2129837.
It is essential for round slings of this type that the core only fills the cross-section of the protective tube to about 50-70% and is therefore freely longitudinally movable in relation to the protective tube and that the individual windings of the core are also not fixed in relation to the protective tube and to one another. It is only in this way that it is possible for the different windings to move in relation to one another under a load attack and to have the same length as a result of the load, so that overloading of a single thread winding is avoided.
A feature of such a round sling also consists in the fact that in the unloaded state the protective tube is somewhat longer than the core, so that the protective tube lies in slight folds along the core.
The manufacturing process of such a round sling is also described in more detail in DE-B No. 2129837.
For this purpose, the prefabricated protective tube is placed on a tube that is open on one side in the longitudinal direction over a circumferential area of approximately 180 °, i.e. pushed onto a gutter and pushed or compressed in the longitudinal direction to less than half of its length so that the tube surrounds the tube with a strong fold. Then a thread of textile yarn, plastic or the like is drawn in the longitudinal direction through the tube interior or through the interior of the protective tube. The end of the thread drawn through is then drawn back on the outside of the protective tube back to the insertion end and again drawn through the protective tube or the groove in the longitudinal direction. This process is repeated many times in such a way that a thread roll consisting of many layers of thread circles, but formed from only one thread, is created. Due to the large number of layers of thread passing through the protective tube side by side, it is not necessary to knot or connect the ends of the thread. Rather, the ends can be loose without the tensile strength of the thread winding being impaired thereby. After the thread winding has been produced in this way, the protective tube is pushed from the groove in the longitudinal direction onto the thread winding or threads. The thread wrap is then removed from the trough so that it is also free. The compressed protective tube is then pushed over the entire circumference of the thread winding. Its ends are inserted into each other and preferably sewn together. The protective tube has an initial length such that, in the final state, it is still somewhat longer than the thread wrap or the threads around it. As a result, he surrounds the thread winding (s) with a light drapery.
An essential feature of such known round slings is that they hook in the system areas on the crane or take on a very flat oval cross-sectional shape in which the individual threads of the thread winding (s) lie largely side by side and not on top of each other. It is precisely this fact that ensures an even load distribution on the individual windings of the thread winding.
The invention is based on the object of designing a round sling of the type mentioned at the outset in such a way that the very flat cross-sectional shape which arises under load, in particular in the system areas, is as far as possible predetermined by the construction of the round sling, or that such a flat cross-sectional shape is also taken even before a load attack, in particular under load, if possible, is already stimulated by design. This object is achieved by the characterizing part of claim 1 and is given an additional support effect by the characterizing part of claim 2. In the solution according to claim 2, the flat webs could theoretically also be formed by sewing two strips lying one on top of the other in the edge regions to form a tube. However, the flat webs can advantageously be easily incorporated when the protective tube is being woven. It must be taken into account here that a tube is a two-layer weave, the two layers of which are not connected to one another. In a similar manner, known two-ply webbing straps are produced, which differ from woven hoses only in that their two ply layers are connected to one another by a binding chain incorporated during weaving. Such two-ply webbing straps can also be used according to the invention. According to the invention, said flat web or flats are formed by incorporating or running in a binding chain in the desired flat web regions when weaving the protective tube. The chain-free areas of the two-layer fabric then form the actual hose.
The flat webs also have the effect of a wear protection strip on both sides.
The further invention relates to a sling formed from such a round sling. Stropp is used to denote round slings in which two round sling parts lying opposite one another are combined or connected to one another in an intermediate region between two hanging eyes. The further invention now consists in the mutual connection of the two round sling parts by sewing their opposing flat webs to one another. This ensures that the sewing needle used to produce the connecting seam does not pierce the thread winding and can damage its individual threads. This also ensures that the free movement of the individual threads relative to the protective tube and relative to one another, which is so important for the functionality of the round sling or the sling, is not impaired by the seam.
The inventive design of the sling enables the application of an abrasion protection pad - also called a work surface - also without damaging the load-bearing thread winding or without impairing the round loop or thread winding function according to the characterizing part of claim 5.
Furthermore, the invention makes it possible, in accordance with the characterizing part of claim 6, to securely fasten protective tubes for the hanging eyes of the slings in a simple manner.
According to the characterizing part of claim 7, it is possible in a simple manner to produce a round sling mat similar to such as those e.g. is used to lay pipes.
The subject matter of the invention is illustrated, for example, using the figures. Show it:

1 shows a cross section laid through a round sling according to the invention,
2 shows a cross section through a round sling strand in comparison with the embodiment according to FIG. 1 modified embodiment,
3 shows a cross-section through a sling made from a round sling according to FIG. 2 with an abrasion protection pad optionally sewn on,
4 shows a modified embodiment of a sling according to FIG. 3,
5 is a perspective view of a round sling mat made from round slings designed according to the invention,
6 is a plan view of the round sling mat,
7 is a perspective view of a sling made from a round sling according to FIG. 1,
Fig. 8 is an enlarged detail view of the upper hanging eye according to arrow VIII in Fig. 7 with an enveloping tube section sewn into the ends of the flat web seam.

The round sling, designated overall by 1, consists of a core 2 in the form of one or more thread windings and a seamlessly woven protective tube 3 surrounding the core 2 in its entirety with considerable slack. At least one flat web 4 protruding laterally from its cross section is attached to the protective tube 3 woven. The thread winding of the core 2 consists of monofilament plastic threads drawn endlessly into the tube 3.
The flat web 4 is formed during the tube weaving process simply by incorporating a binding chain over its width 5 into the two-layer fabric, as is familiar to every weaving specialist.
The round sling 1 shown in FIG. 2 has an woven flat web 4 or 6 on two diagonally opposite sides of the hose cross section.
In the strop 12 shown schematically in cross section in FIG. 7, the abutting flat webs 4 of two adjacent parts of the protective tube 3 are sewn to one another by the seam 7. The strop 12 is formed in that in the intermediate area 8 between the hanging eyes 9 two round sling parts 10, 11 are grouped together.
In the intermediate area 8, an abrasion protection pad 13 in the form of e.g. a textile band can be sewn or fastened by sewing (seams 7, 14) with at least one of the flat webs 4, 6.
On the protective tube 3 of a round sling 1 or a strop 12, two in particular seamless enveloping tube sections, which enclose the tube sections forming the hanging eyes 9, in FIG Flat webs 4 of the protective tube 3 are sewn.
5 shows a round loop mat 18 produced using three round slings 3 or 12, with the hanging eyes 9 suspended in a lifting harness 17. The round slings 3 are placed next to one another in the manner of strops 12. They are connected to one another by seams 7 and 14, which in turn are introduced into the flat webs 4 and 6, respectively.
In the GE Hüllschlauchabschnitten 15 _- protected Einhängeaugen 9 of the slings 12, the Hüllschlauchabschnitte be pushed 15 prior to retraction of the yarn layer on the protective tube. 3 The thread winding is - as already explained at the beginning - described in more detail in DE-OS No. 2716056.

Claims

1. Loop comprising a core in the form of one or more yarn skeins and a seamless-woven protective sheath which encloses the entire core with considerable play, characterized in that at least one flat rib (4) is woven to the protective sheath (3) so as to project laterally from the cross-section of the protective sheath (3).

2. Loop according to claim 1, characterized in that a flat rib (4, 6) is woven to each of two diagonally oppositely disposed sides of the sheath cross-section.

3. Loop according to claim 1 or 2, characterized in that the flat rib or ribs (4,6) are formed by a two- layer fabric whose two layers each change into the sheath wall at one side.

4. Sling having hard eyes and formed from a loop according to one or more of the preceding claims and in which two sling sections (10,11) are combined contiguously in the intermediate region (8) between the hard eyes (9), characterized in that flat ribs (4) which are shaped, in particular woven, to the loop sections to face each other are sewn together, in particular so as to lie on top of each other.

5. Sling according to claim 4, characterized in that, in the intermediate region (8) on the working side of said sling, an abrasion projection cover (3) is fastened in the form of, for example, a tape to at least one of the flat ribs (4, 6) by sewing.

6. Sling according to claim 4 or 5, characterized in that two, in particular seamless, covering tube sections (15) are pushed onto the protective sheath (3) so as to encase the sheath sections forming the hard eyes (9), the ends (16) of said covering tube sections which protrude into the intermediate region (8) being sewn to the flat ribs (4).

7. Loop mat produced by using at least two loops or slings formed according to one or more of the preceding claims, characterized in that the loops are placed next to one another in the manner of the loop sections (10,11) of slings (12) and the contiguous sling strands are connected together either directly by means of seams (7, 14) in their flat ribs (4, 6) or by means of a cover in the form of an abrasion protection cover, a woven webbing or the like, which extends over the entire width of the mat and which is laid on one side of the strands and sewn to the flat ribs (4, 6).