ROUND SLING

Abstract

A round sling for raising loads, consisting of a load-carrying inner nonwoven fabric, which inner nonwoven fabric is formed from a continuous roll of a plurality of supporting threads running substantially parallel to one another and a protective sleeve in the form of a textile protective tube surrounding the inner nonwoven fabric with a radial degree of freedom, the protective tube being a textile fabric woven from warp and weft threads.

Claims

1. A round sling consisting of an inner fabric for bearing a load, wherein the inner fabric is formed by an endless wrap of a plurality of load-bearing threads running substantially parallel to one another and a protective sleeve surrounding the inner fabric with a radial degree of freedom in the form of protective textile tube, the protective tube being a textile sheet product woven from warp and weft threads (3), (1), wherein the textile sheet product consists of a multi-layered fabric, the fabric layers of which each have the warp threads (3) which run in the longitudinal direction (L) or longitudinal extension of the protective tube, said warp threads consisting of fibres or yarns with a low elongation capacity in relation to their high tensile strength, and the weft threads (1) running transversely to the longitudinal direction, in transverse direction (Q), have a high elongation capacity in relation to their tensile strength, wherein the fabric layers of the multi-layered fabric are connected to one another by further weft threads (5) running transversely to the longitudinal direction, said weft threads having a high elongation capacity in relation to their tensile strength.

2. The round sling according to claim 1, wherein the further weft threads (5), as connecting threads, connect the warp threads (3) of the multi-layered fabric, which leads to an intersection with warp threads (3) of the multi-layered fabric.

3. The round sling according to claim 1, wherein the further weft threads (5), as connecting threads, connect the warp threads (3) of the multi-layered fabric, which leads to an intersection with each warp thread (3) of the multi-layered fabric.

4. The round sling according to claim 1, wherein, in the case of an asymmetrical structure of the protective tube, the two fabric layers have different numbers of weft threads (5) but at least one further weft thread per binding repeat.

5. The round sling according to claim 1, wherein the multi-layered fabric consists of two or more than two layers.

6. The round sling according to claim 1, wherein the further weft threads (5) float over two or more warp threads (3) of the two fabric layers, before they intersect with the fabric layers.

7. The round sling according to claim 1, wherein the elongation capacity of the further weft threads (5) is equal to or lower than the elongation capacity of the weft threads (1) of the multi-layered fabric.

8. The round sling according to claim 1, wherein the high elongation capacity of the weft threads (1) and/or of the further weft threads (5) is 1.8-fold to 2.5-fold in the elastic range.

9. The round sling according to claim 1, wherein the weft threads (1) and/or the further weft threads (5) consist of an elastane fibre wound with polyester or of a high-performance fibre spun with an elastic fibre.

10. The round sling according to claim 1, wherein the elongation capacity of the fabric of the protective tube of the round sling depends on the insertion frequency of the further weft threads (5).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 shows a schematic representation of a fabric of a protective tube of a round sling in a relaxed state, wherein the further weft threads intersect with each warp thread of the two fabric layers.

[0019] FIG. 1.1 shows a schematic representation of the fabric of a protective tube of a round sling in a tensioned state, wherein the further weft threads intersect with each warp thread of the two fabric layers.

[0020] FIG. 2 shows a schematic representation of a further fabric of a protective tube of a round sling in a relaxed state, wherein the further weft threads float over three warp threads of the two fabric layers before they intersect with the layers.

[0021] FIG. 2.1 shows a schematic representation of a further fabric of a protective tube of a round sling in a tensioned state, wherein the further weft threads float over three warp threads of the two fabric layers before they intersect with the layers.

DETAILED DESCRIPTION OF THE INVENTION

[0022] In both exemplary embodiments the multi-layered fabric consists of only two fabric layers.

[0023] The elastic weft threads 1 and 1 in combination with the warp threads 3/1 to 3/4 form a first fabric layer 2. The elastic weft threads 1 and 1 form a further fabric layer 4 with the warp threads 3/5 to 3/8. The warp threads 3 of the first fabric layer 2 and the further fabric layer 4 run in longitudinal direction L, i.e. in the direction of the longitudinal course of the round sling. The weft threads 1 to 1 run in transverse direction Q, at right angles to the longitudinal direction L of the round sling. The first and further fabric layers 2, 4 are connected by further elastic weft threads 5, which also run in the transverse direction Q, FIG. 1.

[0024] Under transverse load, the first and further fabric layer 2, 4 stretch as shown in FIG. 1.1. The spaces between the warp threads 3/1 to 3/4 of the first fabric layer 2 which are normally present in a single-layer transversely elastic fabric, are now filled with the warp threads 3/5 to 3/8 of the further fabric layer 4 and are thus completely or at least partially filled. When the protective tube of the round sling is stretched in transverse direction Q the warp threads lying on top of one another endeavour to arrange themselves next to each other due to the tension of the further weft threads 5, FIG. 1.1. The warp threads 3/1 to 3/8 therefore lie in the arrangement 3/5, 3/1, 3/6, 3/2, 3/7, 3/3, 3/8 and 3/4 after stretching the protective tube of the round sling in transverse direction Q.

[0025] FIG. 2 shows a further exemplary embodiment of the round sling according to the invention, wherein in FIGS. 2 and 2.1, as also shown in FIGS. 1 and 1.2, a portion of a protective tube of the round sling is shown schematically as part of a textile sheet product. A representation of a cross-section of the round sling as such with its inner fabric, which is formed as an endless wrap from a plurality of load-bearing threads running substantially parallel in the longitudinal direction L, wherein the inner fabric is surrounded and enclosed by the protective tube as a textile sheet product with a radial degree of freedom, is not shown, as this is familiar to the person skilled in the art, for example from the prior art mentioned above.

[0026] FIGS. 2 and 2.1 show an example of a different arrangement of the further weft threads 5 in the fabric of the protective tube of the round sling, wherein the fabric is also multi-layered and consists of the first and the further fabric layer 2, 4 and is formed in the same way as the first exemplary embodiment according to FIGS. 1 and 1.1. except for the insertion of the further weft threads 5.

[0027] In this exemplary embodiment, the further elastic weft threads 5 float over three warp threads 3, before they intersect with the fabric layers, which leads to a less strong weave compared to the arrangement in FIG. 1 which provides an intersection with each warp thread, and thus enables greater stretchability of the fabric of the protective tube of the round sling in transverse direction Q, which is shown in FIG. 2.1. The warp threads 3/1 to 3/8 are in the same arrangement as shown in FIG. 1.1 and explained above after the protective tube of the round sling has been stretched in the transverse direction Q. In general, the further weft threads 5 can also be floated over two or more warp threads 3 before they intersect with the fabric layers.

[0028] The stretching behaviour of the fabric of the protective tube of the round sling is also influenced by the frequency of insertion of the further weft threads 5, so that in addition to a double weft, it is also possible to skip the insertion of the further weft threads 5 over several weft threads, so that the most homogeneous possible stretching behaviour of the protective tube can be achieved in transverse direction Q. This depends on the respective requirements placed on the round sling according to the invention.

[0029] According to the two exemplary embodiments, only a limited number of warp threads are available in a two-layer protective sleeve. Therefore, the advantageous effect according to the invention decreases with increasing elongation of the protective sleeve in the transverse direction Q, so that when the round sling is overloaded, a hole-forming expansion of the multi-layered fabric of the protective tube is to be expected, which can also be an indication of overloading, so that the person skilled in the art has to immediately interrupt the handling of the round sling when such an indication is given.

LIST OF REFERENCE NUMBERS

[0030] 1. weft threads [0031] 2. first fabric layer [0032] 3. warp threads [0033] 4. further fabric layer [0034] 5. further weft threads [0035] Q transverse direction [0036] L longitudinal direction