Traction element made of fiber reinforced plastic

Patent metadata

Field	Value
Publication number	US-2017113403-A1
Application number	US-201615291372-A
Country	US
Kind code	A1
Filing date	Oct 12, 2016
Priority date	Oct 21, 2015
Publication date	Apr 27, 2017
Grant date	—

Abstract

A tension member with at least one loop made from fiber-reinforced plastic, which tension member has a plurality of fibers that run substantially parallel to each other, so that the loop is formed by the plurality of fibers, wherein a first group of fibers is turned over along the loop in a first turning direction, while a second group of fibers is turned over along the loop in a second turning direction, which is opposed to the first turning direction. Some of the turned-over fibers of both groups end in a different distance from the vertex of the loop than others of the turned-over fibers, so that a cross-section of the tension member that results from the respective number of fibers that run approximately parallel to each other outside the turning-over area of the fibers approximately continuously decreases until it reaches the cross-section size of the tension member.

First claim

1 . A tension member comprising: at least one loop made of fiber-reinforced plastic, which tension member has a plurality of fibers, which run parallel to each other, wherein the loop is formed from the plurality of fibers by a first group of fibers being turned over along the loop in a first turning direction while a second group of fibers is turned over along the loop in a second turning direction, which is opposed to the first turning direction, and wherein some turned-over fibers of both groups end in a different distance from the vertex of the loop than others of the turned-over fibers, so that a cross-section of the tension member that results from a respective number of fibers running approximately parallel to each other outside the turning-over area of the fibers approximately continuously decreases until it reaches the cross-section size of the tension member.

2 . The tension member according to claim 1 , wherein the first group of fibers comprises a number of fibers that differ by a maximum 20 percent from a number of fibers of a second group of fibers.

3 . The tension member according to claim 1 , wherein some fibers from the first group and some fibers of the second group are alternately turned over according to their respective turning direction, thereby forming the loop.

4 . The tension member according to claim 1 , wherein ends of the turned-over fibers are connected to the tension member via a firmly bonded connection.

5 . The tension member according to claim 1 , which has a substantially straight stretched and dividing shaft section that has a loop on at least one end.

6 . The tension member according to claim 1 , which has a substantially straight stretched shaft section, which has at least one loop on one first end as well as on another second end each.

7 . The tension member according to claim 1 , which has a substantially straight stretched shaft section that on one side or on both sides divides into several cords and has a loop on each end.

8 . The support structure, which comprises a plurality of tension members according to claim 1 .

9 . A method for manufacturing a tension member from a fiber-reinforced plastic with a loop, wherein the loop is manufactured comprising the following steps:
providing a plurality of fibers of the tension member running substantially in parallel to each other with a respective fiber end, turning a plurality of fiber ends of the fibers over in a first turning direction along the loop that is to be manufactured; turning over a further plurality of fiber ends of fibers in a second turning direction, which is opposed to the first turning direction; repeating the last two steps, until all fibers of the plurality of fibers have been turned over, so that the turning-over occurs such that some of the turned-over fibers end in a different distance from the vertex of the loop than others of the turned-over fibers, so that a cross-section of the tension member that results from the respective number of fibers that run approximately parallel to each other outside the turning-over area of the fibers approximately continuously decreases until it reaches the cross-section size of the tension member.

10 . The method according to claim 9 , wherein the fiber ends are turned over using a turning element that has a diameter that provides a minimum turning-over radius for the fibers.

11 . The method according to claim 9 , wherein the total number of fibers turned over in the first turning direction does not differ from the total number of fibers turned over in the second turning direction by more than 20%.

12 . The method according to claim 9 , wherein the turning-over of the fiber ends is performed such that some fibers are alternately turned over in accordance with the first turning direction and in accordance with the second turning direction, whereby between 2 and several hundred turning-over steps are performed.

13 . The method according to claim 9 , which comprises a firm bonding of the fiber ends of the turned-over fibers with the tension member.

14 . The method according to claim 9 , which as a first step further comprises creating an arrangement of fibers that are aligned substantially in parallel.

15 . The method according to claim 9 , which additionally comprises applying a coating and/or arranging additional fibers on an outer circumferential surface of the plurality of fibers.

16 . The tension member according to claim 1 , wherein the plurality of fibers are carbon fibers.

Assignees

• Univ Berlin Tech

Inventors

• Zwingmann Bernd
• Liu Yue
• Schlaich Mike

Classifications

• B29C66/7212

  characterised by the composition of the fibres · CPC title

• B29K2307/04

  Carbon · CPC title

• B29C66/69 Primary

  General aspects of joining filaments  (bundling articles  B65B13/00; interconnecting successive lengths of material B65H69/00) · CPC title

• B29L2031/06

  Rods, e.g. connecting rods {, rails, stakes (shafts B29L2031/75; poles, masts, posts B29L2031/766)} · CPC title

• B29C65/48

  using adhesives {, i.e. using supplementary joining material; solvent bonding} · CPC title