Round Sling

Abstract

The invention relates to a roundsling for lifting loads, which comprises an inner non-interwoven structure for receiving the load and a protective cover in the form of a textile protective sleeve having a radial degree of freedom and surrounding the inner non-interwoven structure, the inner non-interwoven structure being formed from endless wound loops of supporting threads which run essentially parallel to one another, the protective sleeve being a textile product woven from warp threads and weft threads, the textile product being made of a multi-layered fabric, the textile layers of which respectively have warp threads extending in the longitudinal direction (L) or longitudinal extension direction of the protective sleeve, which consist of fibres or threads which have a low stretch capacity compared to the high tensile strength of the warp threads and weft threads extending transversely to the longitudinal direction, which have a high stretch capacity compared to the tensile strength of the weft threads, the textile layer of the multi-layered fabric comprising a further weft thread extending transversely to the longitudinal direction, the weft thread having a high stretch capacity compared to the tensile strength of the connecting threads.

Description

[Technical field]

[0001] The present invention relates to a roundsling for lifting a load, which has an inner non-woven structure for receiving the load, also called core, which is formed from endless loops of a plurality of parallel support threads and is provided with a protective cover in the form of a textile sleeve having a radial degree of freedom and surrounding the inner non-woven structure. [Background technology]

[0002] In order to improve the stretchability of protective sleeves, so-called stretch yarns, textile products having fiber components or threads with high stretchability relative to their tensile strength, have been used in the past, as disclosed in US Pat. No. 5,399,323.

[0003] In this case, textile products forming the protective sleeve are also known, which are textile products woven from warp and weft threads, whereby the warp threads extending in the longitudinal direction (L) or longitudinal extension direction of the protective sleeve consist of fibres or threads which have a low stretching capacity compared to the high tensile strength of the textile product, and the weft threads have a high stretching capacity compared to the tensile strength of the textile product, and consist of elastic fibres or elastic threads, as for example also disclosed in US Pat. No. 5,399,433 and US Pat. No. 5,499,433.

[0004] In the functional use of the roundsling as a sling, when it is hung under tension on a carrying device, for example a load, a load-lifting device or a load hook, the non-interwoven structure expands transversely to the longitudinal direction (L). The need to increase the amount of sleeve material is provided by warp thread binding or weft thread stretching in a displaced state from the previously compressed fabric. Thus, with the necessary high stretching capacity of conventional single-layered elastic sleeve-like fabrics, the warp thread binding required to maintain a closed fabric surface is not possible beyond a certain stretching. As a result, the warp threads in the fabric can easily be displaced and the sleeve is prone to forming holes. These fabrics spreading or fabrics opening have the disadvantage, among other things, that foreign bodies or similar objects can get into the protective sleeve. It may also be the case that exposed threads detach from the fabric due to external influences. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] DE 102011052 A1 [Patent Document 2] DE 102011052146 [Patent Document 3] French Patent Application Publication No. 2959223 Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE DISCLOSURE The object of the present invention is to remedy the drawback of protective sleeves as described above, that the fabric spreads or becomes perforated when a load is applied. [Means for solving the problem]

[0007] This problem is solved by a roundsling according to the independent claim 1. The dependent claims then contain further advantageous embodiments of the invention. The roundsling according to the invention thus has the following characteristics:

[0008] The roundsling comprises an inner non-woven structure for receiving the load and a protective cover in the form of a textile protective sleeve with a radial degree of freedom surrounding the inner non-woven structure, the inner non-woven structure being formed from a number of support threads running essentially parallel to one another, so-called endless winding loops, which are winding loops of threads, the protective sleeve being a textile product woven from warp and weft threads, the textile product being made of a multi-layered fabric, the textile layers of which are each oriented in the longitudinal extension direction of the protective sleeve as well as in the longitudinal extension direction of the protective sleeve. The multilayer fabric is characterized in that the warp threads, which run in the so-called longitudinal direction (L), consist of fibres or threads which have a low stretch capacity compared to the high tensile strength of the warp threads, and the weft threads, which run essentially transversely to the longitudinal direction, in the transverse direction Q, and therefore also transversely to the warp threads, have a high stretch capacity compared to their tensile strength, and the fabric layers of the multilayer fabric are connected to one another by further weft threads, so-called connecting threads, which run transversely to the longitudinal direction (transverse direction Q), and which have a high stretch capacity compared to their tensile strength. Within the scope of the present invention, the multilayer fabric can consist of two or more layers.

[0009] Advantageously, the further weft thread serves as a connecting thread and connects the warp threads of the multi-layer fabric, for example crossing each of the warp threads as well.

[0010] The stretchability of the other weft yarn is equal to or less than the stretchability of the weft yarn of the multi-layer fabric.

[0011] When the plural refers to a weft thread and a further weft thread, in the sense of the present invention, it can mean only a single weft thread or a further weft thread of a reel of an apparatus for producing protective sleeves, or it can also mean threads from several reels.

[0012] Whenever reference is made to stretchability or extensibility, what is meant within the meaning of the present invention is always the elastic stretchability. In this respect, elastic stretching.

[0013] The length of the weft thread and / or the other weft thread can be extended within the elastic range, for example by 180 percent or more, in a preferred embodiment up to 250 percent, which means a high stretching capacity. Thus, the high stretching capacity of the weft thread and / or the other weft thread is 1.8 to 2.5 times higher within the elastic range.

[0014] Those skilled in the art will recognize that the stretchability of the protective sleeve is also affected by the extensibility of the weft yarns, and that the density of the weft yarns and the type of weave, e.g., type of yarn crossing, also affect stretchability.

[0015] Within the scope of the present invention, the weft thread and / or the separate weft thread may consist of elastane fibres wrapped with polyester, or high performance fibres spun with elastic fibres, or any other suitable material.

[0016] In another embodiment, the protective sleeve has two textile layers, which in the case of an asymmetrical structure of the protective sleeve have a different number but with at least one separate weft thread per bonding repeat. It is also within the scope of the present invention to combine one or more connecting threads as separate weft threads in order to achieve different properties of the layers in terms of elongation behavior and compactness and to match them with the properties required for the protective sleeve.

[0017] The solution according to the invention creates a more closed fabric structure, so that the fabric of the protective sleeve of the roundsling is less likely to spread or to be punctured under load, thus reducing the risk of hole formation and the entry of foreign bodies.

[0018] The invention is further explained below on the basis of two exemplary embodiments with reference to the drawings, in which further advantages, features and forms of the invention emerge. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic diagram of the fabric of the protective sleeve of a roundsling in a relaxed state, in which a separate weft thread crosses each warp thread of the two fabric layers. [Figure 1.1] FIG. 1 is a schematic diagram of the fabric of the protective sleeve of a roundsling in a tensioned state, in which a separate weft thread crosses each warp thread of the two fabric layers. [Diagram 2] FIG. 1 is a schematic diagram of another weave of the protective sleeve of the roundsling in a relaxed state, in which another weft thread floats above the three warp threads of two fabric layers before crossing the layers. [Figure 2.1] FIG. 1 is a schematic diagram of another woven fabric of a protective sleeve of a roundsling in a tensioned state, in which another weft thread floats above the three warp threads of two woven fabric layers before crossing the layers. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] In two embodiments, the multi-layer fabric consists of only two fabric layers.

[0021] The elastic weft threads 1 and 1 respectively form a first textile layer 2 in combination with warp threads 3 / 1 to 3 / 4. The elastic weft threads 1'' and 1'''' form a further textile layer 4 with warp threads 3 / 5 to 3 / 8. The warp threads 3 of the first textile layer 2 and of the further textile layer 4 extend in a longitudinal direction L, i.e. in the direction of the longitudinal extension of the roundsling. The weft threads 1' to 1''' extend transversely to the longitudinal direction L of the roundsling, in a transverse direction Q. The first and further textile layers 2, 4 are connected by an elastic further weft thread 5 which also extends in the transverse direction Q (Figure 1).

[0022] Under transverse load, the first and further textile layers 2, 4 unfold according to Fig. 1.1. Here, the gaps between the warp threads 3 / 1-3 / 4 of the first textile layer 2, which normally occur in the case of a single-layer transversely elastic textile, are covered by the warp threads 3 / 5-3 / 8 of the further textile layer 4 and are thus completely or at least partially filled. When stretched in the transverse direction Q of the protective sleeve of the roundsling, the warp threads overlapping each other try to arrange themselves next to each other due to the tension of the further weft threads 5 (Fig. 1.1). After stretching the protective sleeve of the roundsling in the transverse direction Q, the warp threads 3 / 1-3 / 8 are in the arrangement 3 / 5, 3 / 1, 3 / 6, 3 / 2, 3 / 7, 3 / 3, 3 / 8 and 3 / 4.

[0023] Figure 2 shows another embodiment of a roundsling according to the invention, a part of the protective sleeve of the roundsling is depicted as part of a textile product in figures 2 and 2.1 and 1 and 1.2. The depiction of a cross section of such a roundsling with an inner non-interwoven structure, formed from a number of support threads extending essentially parallel to the longitudinal direction L as endless wound loops and with a radial degree of freedom by the protective sleeve as textile product, is not shown, since it is known to the skilled person, for example from the prior art mentioned above.

[0024] Figures 2 and 2.1 show examples of different arrangements of the further weft thread 5 in the fabric of the protective sleeve of the roundsling, whereby the fabric is also multi-layered and consists of a first and a further fabric layer 2, 4 and is formed similarly to the first embodiment according to Figures 1 and 1.1, except for the incorporation of the further weft thread 5.

[0025] In this embodiment, the elastic separate weft thread 5 floats over three warp threads 3 before crossing with the fabric layer, resulting in a weaker bond and therefore a greater extensibility of the roundsling protective sleeve in the transverse direction Q of the fabric, as depicted in FIG. 2.1, compared to the arrangement of FIG. 1, which contemplates crossing with each warp thread. After stretching the roundsling protective sleeve in the transverse direction Q, the warp threads 3 / 1 to 3 / 8 are in a similar arrangement, as depicted in FIG. 1.1 and explained above. In general, the separate weft thread 5 can also float over two or more warp threads 3 before crossing with the fabric layer.

[0026] The stretching behavior of the fabric of the protective sleeve of the roundsling is therefore also influenced by the incorporation frequency of the further weft thread 5, so that in addition to a double weft thread it is also possible to interrupt the incorporation of the further weft thread 5 over several weft threads, in order to achieve as uniform an elongation behavior as possible of the protective sleeve in the transverse direction Q. This depends on the respective requirements placed on the roundsling according to the invention.

[0027] According to the two embodiments, only a limited number of warp threads are available in the two-layer protective sleeve. The advantageous effect according to the invention therefore decreases with increasing stretching of the protective sleeve in the transverse direction Q, so that in case of overloading of the roundsling, widening of the holes in the multi-layer fabric of the protective sleeve can be expected, which can be an indication of overloading, so that the skilled person must immediately discontinue handling of the roundsling in case of such indications. [Explanation of symbols]

[0028] 1 Weft 2. First Fabric Layer 3. Warp Threads 4. Another layer of fabric 5 Different weft threads Q Transverse direction L Longitudinal

Claims

Claim 1 A round sling comprising an inner non-woven structure for receiving a load and a protective cover in the form of a textile protective sleeve having a degree of freedom in the radial direction and surrounding the inner non-woven structure, wherein the inner non-woven structure is basically formed from endless winding loops of a plurality of support threads extending parallel to each other, the protective sleeve is a fabric product woven from warp threads (3) and weft threads (1), the fabric product is composed of a multi-layer fabric, each fabric layer of the multi-layer fabric comprises warp threads (3) extending in the longitudinal direction (L) or the longitudinal extension direction of the protective sleeve, the warp threads being made of fibers or threads having a lower stretching ability compared to the high tensile strength of the warp threads, and weft threads (1) extending in the transverse direction, the transverse direction (Q) with respect to the longitudinal direction having a higher stretching ability compared to the tensile strength of the weft threads, the fabric layers of the multi-layer fabric are connected to each other by another weft thread (5) extending laterally with respect to the longitudinal direction, the another weft thread having a higher stretching ability compared to the tensile strength of the weft thread, a round sling. Claim 2 Another weft thread (5) as a connecting thread connects the warp threads (3) of the multi-layer fabric so as to intersect the warp threads (3) of the multi-layer fabric, The round sling according to claim 1. Claim 3 Another weft thread (5) as a connecting thread connects the warp threads (3) of the multi-layer fabric so as to intersect each warp thread (3) of the multi-layer fabric, The round sling according to claim 1. Claim 4 The protective sleeve comprises two fabric layers, and when the two fabric layers have an asymmetric structure of the protective sleeve, they have different numbers of another weft thread (5) but each bonding repetition comprises at least one another weft thread (5), The round sling according to claim 1. Claim 5 Another weft thread (5) floats over two or more warp threads (3) of the two fabric layers before the another weft thread (5) intersects the fabric layer, The round sling according to claim 1. Claim 6 The stretching ability of another weft thread (5) is less than or equal to the stretching ability of the weft thread (1) of the multi-layer fabric, The round sling according to claim 1. Claim 7 The high stretching ability of the weft thread (1) and / or another weft thread (5) is 1.8 to 2.5 times within the elastic range, The round sling according to claim 1. Claim 8 The lateral yarn (1) and / or the other lateral yarn (5) consists of an elastane fiber wound with polyester or consists of a high-performance fiber spun with an elastic fiber. The round sling according to claim 1.

9. The stretching behavior of the fabric of the protective sleeve of the round sling depends on the incorporation frequency of the other lateral yarn (5). The round sling according to claim 1.

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