DE1435220A1 - Synthetic thread ropes - Google Patents

Description

Item VGP IO98 Gm

Synthetic thread ropes.

United Glossstoff ^ Fabriken AG. Wuppertal-EiberfeId

The innovation concerns a rope made of synthetic threads, in which the core consists of several layers and one braided Sheath enclosed 1st and which is completely free of twist.

Various rope constructions are known, for example cross-braided and spiral-braided ropes, which are completely free of twist. that the substance utilization, i.e. the ratio of the strength of the rope to the strength of the individual threads, because of the constriction the threads at the crossing points, especially with the spiral fluted ropes, are very small. It also exhibits the latter an always undesirable high initial elongation.

Veiter is familiar with a twist-free so-called core-sheath rope, in which a group of core threads running parallel in the direction of the rope axis are held together by a braided sheath will. These ropes show a very good utilization of the substance, since the threads of the core all run in the direction of the tensile stress. In the case of sudden loads, especially when the rope is bent around a curve with a very small radius - for example in the A climber falls into the rope diverted in the carabiner, but also in practically most cases where a rope is used - however, only part of the core threads are subjected to tensile stress, while the part located inside the arch does not carry it, see above that the breaking strength is greatly reduced at this point.

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Item VGF IO98

By simply losing the core, one has tried to get the To avoid the disadvantage of the rope with core threads running parallel in the direction of the rope axis. The strength at sudden Stress was also noticeably increased as a result. The main drawbacks, however, were the tendency to untwist and to the so-called Krangeln and also the tendency to Kropfbildurig, a deformation of the rope in which the core threads change their position, forming a permanent thickening.

By dividing the example about βθ% of the amount of yarn of the cable core containing in several in different directions and to different degrees whipped around a stranded core was Schlch--th Although twist achieved freedom and thereby completely eliminates the tendency to kinking. If such a rope is subjected to strong bending stresses with a loosely braided sheath with a view to high flexibility, and in general especially where the sheath becomes loose due to partial displacement on the core, there is also the danger with this rope of deformations of the rope At this point the core structure loosens and shifts, which can lead to a reduction in rope strength and also enables the permanent thickening already mentioned above, the so-called goiter formation.

It has now been found that the advantages of the core-sheath rope With a multi-layer core that does not rotate under load and can also practically completely eliminate the risk of local deformation of the core structure and thus goiter formation, By interweaving these cohesive opposing threads with each individual winding layer of the rope core, their thread thickness is significantly less than that of the ply threads and their number

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is equal to or less than the number of threads in the relevant Winding position. Due to the opposing threads, the coat, which on the one hand should not be too tight, is as high as possible To allow flexibility and suppleness of the rope, but on the other hand not to be too loose, because otherwise goiter formation is very easily possible, and also due to uncontrollable changes in the structure of the rope core during partial Moving the sheath can alter the rope strength in a very unfavorable manner, in part from its task Keeping the structure of the rope core together relieves the load and can therefore, with due regard to the required flexibility of the Rope be much looser than in the rope constructions of the previously known type. There is a risk that the structure of the rope core with further loosening of the sheath (e.g. by partial displacement) in the strength of the rope lowering Changed way, no longer available.

It has been shown that the thread thickness of the opposing threads processed at most 1/10 to 1/8 of that in the respective winding layer Thread thickness should be. However, much smaller thread sizes, for example in the range 1/100 to 1/50, are preferred the thread thickness of the respective winding layer is used.

The number and strength of the opposing threads are essentially determined according to the intended use of the rope as well as the number of layers making up the core. To especially the high Use of the substance and the possibility of equalizing tension between the lower and upper layers in the event of strong bending In any case, it is advisable to keep the strength and number of threads running in opposite directions as small as possible.

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H35220

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The structure of the rope according to the innovation is based on a drawing explains which as an example implementation such shows rope consisting of a three-layer core.

on the stranded, consisting of parallel single threads 5 At the core 1 of the rope, the two layers 2 and 3 are laid one after the other, each of which is formed from the threads 6 and δ are. Simultaneously with the beating of, for example, threads with a titer of 7500 den. existing respective The opposing threads 7 and 9 are braided in the 2nd layer. The dashed representation of the same in the figure is intended to indicate that their strength is considerably below that of the threads 6 and 8 forming the plies or layers. The finished one, out several - in this case? - Layers of existing sell core is then in the usual way with a braided jacket 4 enveloped.

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Claims (2)

Item VGF IO98 Gm protection claims 1.! Ropes made of synthetic threads with several layers of "- twist-free core enclosed by a braided jacket, characterized in that each individual winding layer of the rope core intertwined with it and holding it together in opposite directions Has threads whose thread thickness is much smaller than that of the ply threads and their number is less than or equal to the number of threads in the associated winding layer. 2. Rope according to claim 1, characterized in that the strength of the opposing threads is at most 1/8 and preferably 1/100 to 1/50 of the thickness of the threads in the associated winding layer. 909806/0 271 ORIGINAL INSPECTED