CA2723253A1 - Seat belt webbing and method for manufacturing the same - Google Patents

Seat belt webbing and method for manufacturing the same Download PDF

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Publication number
CA2723253A1
CA2723253A1 CA2723253A CA2723253A CA2723253A1 CA 2723253 A1 CA2723253 A1 CA 2723253A1 CA 2723253 A CA2723253 A CA 2723253A CA 2723253 A CA2723253 A CA 2723253A CA 2723253 A1 CA2723253 A1 CA 2723253A1
Authority
CA
Canada
Prior art keywords
warp threads
seat belt
thread
belt webbing
weft thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2723253A
Other languages
French (fr)
Other versions
CA2723253C (en
Inventor
Willibert Welz
Chris Van Helvoort
Anita Pool
Simon Valkenburg
Kai-Stephan Mueller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Autoliv Development AB
Original Assignee
Autoliv Development AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Autoliv Development AB filed Critical Autoliv Development AB
Publication of CA2723253A1 publication Critical patent/CA2723253A1/en
Application granted granted Critical
Publication of CA2723253C publication Critical patent/CA2723253C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00Woven fabrics designed to make specified articles
    • D03D1/0005Woven fabrics for safety belts
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/02Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein loops of continuous weft thread are inserted, i.e. double picks
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D5/00Selvedges

Abstract

The invention relates to a seat belt webbing comprising:
- a plurality of warp threads (1, 3), - a weft thread (2) which runs from one edge of the seat belt webbing to the other edge periodically reversing the direction in reversal points and is interwoven with the warp threads (1, 3), wherein - the weft thread (2) in the reversal points in an edge portion (B) is folded back forming a loop, and - a catch thread (5) which is fed through the loops of the weft thread (2), characterized in that - the catch thread (5) is placed between the warp threads (1, 3) and is covered by the weft thread (2) and/or by the warp threads (1, 3) towards the surface of the seat belt webbing.

Description

Seat belt webbing and method for manufacturing the same The invention relates to a seat belt webbing and a method for manufacturing the same comprising the features of the preambles of claims 1 or 6.

Seat belts are used for example in motor vehicles, aircrafts and other mobile devices for restraining the occupant. To perform their function, the seat belts need to show a predetermined ten-sile strength. Furthermore, the seat belts should generally com-prise a surface showing as low friction as possible and a soft edge, in order that the occupant is obstructed by the seat belt as little as possible and the clothes of the occupant are not damaged.

The seat belt webbing comprises a plurality of warp threads running in the longitudinal direction which are connected with each other by a weft thread running transversely to the warp threads. During the weaving process, the weft thread is shot through the warp threads from one side of the belt webbing using a weft needle and is caught on the other side using a catch thread, so that when the weft needle is retracted the weft thread is not retracted with it. In the case of loading the seat belt webbing during an accident the warp threads are the load-bearing threads and therefore need to show a certain tensile strength, whereas the weft thread is loaded to a lesser extent and essentially forms the surface of the belt webbing. Thus, the weft thread should show better surface properties than the warp threads, however, in the sense of a softer surface may show a lower tensile strength than the warp threads.
From EP 1 514 962 A2, a belt webbing is known, which in the edge regions comprises warp threads showing a different shrinkage cha-racteristic than the warp threads in the central region. In the successive shoots, the weft thread is interwoven with a varying number of warp threads, so that in the edge region certain warp threads, for example at every fourth or fifth shoot only, are looped around by the weft thread. After weaving the belt webbing the same is subjected to a heat treatment, during which a soft edge is formed by intentionally shrinking the warp threads diffe-rently in the edge region.

Furthermore, seat belt webbings are known, in which the warp threads in the edge region are designed to be considerably finer than the warp threads in the central region. Owing to the finer is warp threads in the edge region the edge of the seat belt webbing is softer and the surface of the seat belt webbing is considera-bly more homogeneous, so that the sawing effect of the seat belt webbing when rubbing against the edge is considerably reduced.

It is the object of the invention to provide an enhanced seat belt webbing comprising a soft edge and a method for manufactur-ing the same.

For the solution of the object, the invention proposes a seat belt webbing comprising the features of claim 1 and a method com-prising the features of claim 6.

Further preferred embodiments of the invention can be learned from the sub claims, the figure as well as the related des-cription.
For the solution of the object, it is proposed according to the invention that the catch thread is placed between the warp threads and is covered by the weft thread and/or the warp threads s towards the surface of the seat belt webbing.

The catch thread itself in the seat belt webbing has the function to retain the weft thread in the reversal points during the weav-ing process, which is why it has to show a certain tensile strength, in order that it does not tear during the weaving process and consequently the weaving process needs to be inter-rupted. Surprisingly, the catch thread appearing on the surface has turned out to have a crucial co-influence on the hardness of the edge. Due to its function the properties of the catch thread is differ from the properties of the weft thread, so that owing to the catch thread appearing on the surface between the weft threads the surface becomes inhomogeneous, and the sawing effect of the edge when rubbing for example against the clothes of the occupant is increased. Due to the solution according to the in-vention the surface of the edge is now defined by the weft thread and/or by the warp threads only, as the catch thread is placed between the warp threads and is covered by the weft threads and/or the warp threads. The catch thread thus is no longer visi-ble from the outside. A further advantage resulting from the in-vention is that both edges of the seat belt webbing thus are nearly identical, even if a weaving technique is used, in which a catch thread is provided on one side only, and the weft thread is inserted from one side only.
It generally is a disadvantage of inhomogeneous sides of the seat belt webbing that they wear away differently, and the seat belt webbing thus, after long-time wearing, gives the optical impres-sion to the beholder of being of lower value. Furthermore, when the belt webbing is mounted with a misalignment the inhomogeneous edges may lead to an undesired noise occurring in the seat belt retractor during the retraction movement and extraction movement of the seat belt webbing. For this reason, when mounting the belt webbing in the seat belt retractor specific cost-incurring meas-io ures need to be taken, in order to prevent the seat belt webbing from being mounted incorrectly with a misalignment. Inhomogeneous edges further result in the seat belt webbing making additional noise when being pulled through the deflector, in the retraction forces and extraction forces of the seat belt webbing changing is disadvantageously and in the belt bearing surface of the deflec-tor being worn away unequally.

In the following, the invention is described in more detail on the basis of a preferred embodiment. The only figure shows a seat 20 belt webbing according to the invention comprising a catch thread which is placed between the warp threads.

The seat belt webbing may be subdivided into a center portion A
and an edge portion B. In the center portion A, warp threads 1 25 are provided, which have a thread size of 900 to 2100 dtex and are designed as multifilaments comprising filaments which are not twisted or filaments which are twisted with up to 150 twists per meter length. The warp threads 1 have the function to absorb the tensile forces acting during the accident and, therefore, are 30 particularly strong and thus also relatively stiff. In the edge -portion B, finer warp threads 3 having a thread size of 400 to 1100 dtex are provided, which as well are designed as multifila-ments comprising for example 28 filaments. The filaments further are twisted with each other up to 150 times per meter length.
Furthermore, a weft thread 2 is provided, which, while the belt webbing is woven, with a weft needle is shot from one side through a shed formed by two layers of warp threads 1 and 3 which are aligned at an angle relative to each other. At an edge of the seat belt webbing, the weft thread 2 is caught using a catch thread 5 and is crocheted with the same via a knitting needle.
The weft thread 2 as well is designed as a multifilament having a thread size of 280 to 1100 dtex and comprises for example 96 fi-laments which are twisted with each other 130 times per meter is length. Owing to the great number of filaments the weft thread 2 is particularly self-moveable, so that with the weft thread a particularly soft and homogeneous surface can be obtained. The catch thread 5 is designed as a multifilament as well and has a thread size of 280 dtex and comprises 48 filaments with 80 twists per meter. Furthermore, a lock thread 4 is provided, which is guided together with the catch thread 5 and effects a better co-herence of the textile composite in the seat belt webbing.

As can be seen in Fig. 1, the finer warp threads 3 of the edge portion B are interwoven with the weft thread 2 to form two lay-ers 6 and 7 each with the weaving pattern being formed in such a way that, on one side, three warp threads 3 in a package III and, on the other side, one warp thread 3 in a package I are alter-nately passed by the weft thread 2. The weft thread 2 is a single thread which during the weaving process is guided in a periodic to-and-fro motion and thereby effects the cross connection of the warp threads 1 and 3 and further forms at least a major part of the surface of the seat belt webbing.

At every second shoot, the weft thread 2 is only guided past the warp threads 3 and subsequently, when moving backwards, pulls the catch thread 5 to such an extent into the edge portion B that, in the finish-woven seat belt webbing, the same gets to rest between the warp threads 3 and is covered by the weft thread 2 towards the surface. The catch thread 5 preferably is only pulled into the edge portion B maximally up to the edge of the center portion A between the finer warp threads 3, as the weave of the warp threads 1 to the weft thread 2 in the center portion A differs from the weave of the finer warp threads 3 to the weft thread 2 is in the edge portion B. After said shoot of the weft thread 2 the weft thread 2 at the next shoot is shot through at least a par-tial number of the warp threads 3, preferably through one of the layers 6 or 7, is then caught by the catch thread 5 and, while moving backwards, pulls the catch thread 5 as well as some of the warp threads 3 up to the center portion A. Thus, at the edge of the center portion A an overall soft edge with an inside catch thread 5 is generated, the exterior surface of which edge is formed by the weft thread 2 and the finer warp threads 3 only. As a result, an identical surface structure of the edges of the seat belt webbing is generated, even if the weft thread 2 is caught by the catch thread 5 on one side only, as the catch thread 5 is placed between the finer warp threads 3 and, towards the surface, is covered all over by the weft thread 2, and thus does not ap-pear on the surface.
In particular, the tensile load in the catch thread 5 should be chosen in such a way that the weft needle can pull back the catch thread 5 together with the weft thread 2 with the retraction or carry-along movement being automatically restrictable by the va-rying weave of the warp threads 1 and 3. The weave of the warp threads 1 and 3 is the weaving pattern formed by the weft thread 2 which is shot through and the warp threads 1 and 3 which are moved thereby individually or together in groups. The weaving pattern in the present seat belt webbing in the center portion A

is formed by two paired warp threads 1 each, which are alternate-ly passed by the weft thread 2 on different sides. The weaving pattern and thus the weave of the warp threads 3 in the edge por-tion B is formed by the alternating groups I and III which are formed from three warp threads 3 or one single warp thread 3 each and are passed by the weft thread 2 on different sides. The move-ment of the warp threads 1 and 3 between each single shoot of the weft thread 2 here is not described in detail. However, knowing the commonly used weaving technique, the same can easily be de-duced.

The proposed weave of the warp threads 3 in the edge portion B
has turned out to be advantageous insofar as an edge can be ob-tained thereby having a thickness which is essentially identical to the thickness of the seat belt webbing in the center portion A.

The proposed seat belt webbing in particular provides the advan-tage that it comprises at least two nearly identical soft edges and, though, can be woven with one weft thread 2 only and a one-side guided catch thread 5. Thereby, considerably higher working speeds can be obtained than is possible with belt webbings com-prising soft edges according to the prior art. The loom can be operated with approx. 1500 - 1600 U/min resulting in the manufac-turing costs of the seat belt webbing being significantly lower than for comparable seat belt webbings comprising soft edges.
A further advantage resulting from the invention is that the catch thread 5 is no longer allocated to a certain group of warp threads 1 or 3, as is the case in the prior art. The catch thread 5 loses its orientation and is intentionally placed between the warp threads 1 and 3 without a predetermined orientation, so that the seat belt webbing in the area of the edge no longer shows a hardness distribution which is defined by the catch thread 5 ap-pearing on the surface of the seat belt webbing.

Claims (7)

1. Seat belt webbing comprising:
- a plurality of warp threads (1, 3), - a weft thread (2) which runs from one edge of the seat belt webbing to the other edge periodically reversing the direction in reversal points and is interwoven with the warp threads (1, 3), wherein - the weft thread (2) in the reversal points in an edge por-tion (B) is folded back forming a loop, and - a catch thread (5) which is fed through the loops of the weft thread (2), characterized in that - the catch thread (5) is placed between the warp threads (1, 3) and is covered by the weft thread (2) and/or the warp threads (1, 3) towards the surface of the seat belt webbing.
2. Seat belt webbing according to claim 1, characterized in that - in the edge portion (B), finer warp threads (3) than in a center portion (A) of the seat belt webbing are provided.
3. Seat belt webbing according to claim 2, characterized in that - the weft thread (2) is woven through the warp threads (3) of the edge portion (B) in a repeating weaving pattern formed by three warp threads (3) in a row on one side (III) followed by one warp thread (3) on the other side (I).
4. Seat belt webbing according to claim 2 or 3, characterized in that - the finer warp threads (3) in the edge portion (B) are in-terwoven in at least two layers (6, 7).
5. Seat belt webbing according to one of the claims 2 to 4, characterized in that the catch thread (5) is placed between the finer warp threads (3) of the edge portion (B).
6. Method for manufacturing a seat belt webbing according to any one of the preceding claims, characterized in that the tensile forces in the catch thread (5) and in the weft thread (2) are dimensioned in such a way that the weft thread (2) while moving backwards carries along the catch thread (5).
7. Method according to claim 6, characterized in that the move-ment of carrying along the catch thread (5) is restricted by the varying weave of the warp threads (1, 3).
CA2723253A 2009-12-14 2010-12-02 Seat belt webbing and method for manufacturing the same Active CA2723253C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009058039.5 2009-12-14
DE102009058039.5A DE102009058039C5 (en) 2009-12-14 2009-12-14 Seat belt webbing and method of making the same

Publications (2)

Publication Number Publication Date
CA2723253A1 true CA2723253A1 (en) 2011-06-14
CA2723253C CA2723253C (en) 2014-01-07

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ID=43413525

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2723253A Active CA2723253C (en) 2009-12-14 2010-12-02 Seat belt webbing and method for manufacturing the same

Country Status (7)

Country Link
EP (1) EP2333138B1 (en)
BR (1) BRPI1005574B1 (en)
CA (1) CA2723253C (en)
DE (1) DE102009058039C5 (en)
ES (1) ES2402997T3 (en)
MY (1) MY152722A (en)
ZA (1) ZA201008981B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105706157A (en) * 2013-10-31 2016-06-22 巴科股份有限公司 Display system and method for producing same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011084336B4 (en) 2011-10-12 2013-12-05 Carl Stahl Gmbh & Co. Kg Webbing and method of making a webbing
CN202499976U (en) * 2011-11-21 2012-10-24 东莞润信弹性织物有限公司 Elastic woven tape
DE102013210274B4 (en) 2013-06-03 2014-12-18 Berger Gmbh & Co. Holding Kg Fine-thread safety belt webbing and method for producing such a seat belt webbing
DE102014222654B4 (en) * 2014-11-06 2022-08-25 Autoliv Development Ab Webbing for a seat belt device and seat belt device
CN104674567B (en) * 2015-01-23 2016-08-24 郎溪飞马工业织品有限公司 A kind of efficient manufacture method of safe ribbon
CN104674420B (en) * 2015-01-23 2016-05-25 郎溪飞马工业织品有限公司 A kind of preparation method of safe ribbon

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
JPS6164173U (en) * 1984-09-28 1986-05-01
GB9222207D0 (en) * 1992-10-22 1992-12-02 Ribbons Plc Weaving apparatus and method therefor
DE19602525A1 (en) * 1996-01-25 1997-08-07 Starck H C Gmbh Co Kg Spherical shaped ceramic bodies, process for their production and their use
US7178559B2 (en) * 2003-09-11 2007-02-20 Forrester Ketley & Co. Webbing belt

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105706157A (en) * 2013-10-31 2016-06-22 巴科股份有限公司 Display system and method for producing same

Also Published As

Publication number Publication date
BRPI1005574A2 (en) 2015-02-10
DE102009058039B3 (en) 2011-05-05
EP2333138A1 (en) 2011-06-15
DE102009058039C5 (en) 2014-02-27
CA2723253C (en) 2014-01-07
BRPI1005574B1 (en) 2020-10-06
EP2333138B1 (en) 2013-03-06
ES2402997T3 (en) 2013-05-13
MY152722A (en) 2014-11-28
ZA201008981B (en) 2011-12-28

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