Seat Belt Webbing Edge Homogeneity via Hidden Catch Thread
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Solution Overview
Problem
Existing seat belt webbings often have inhomogeneous edges due to the presence of a catch thread on the surface, leading to uneven wear, noise issues during retraction, and a lower perceived value, as well as increased manufacturing complexity and costs.
Innovation Solution
The catch thread is placed between the warp threads and covered by the weft and/or warp threads, ensuring it does not appear on the surface, thus defining the edge solely by the weft and warp threads, resulting in a homogeneous surface and identical edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the catch thread is left on the surface to retain the weft thread during weaving, then the weaving process is reliable, but the edge becomes inhomogeneous and the sawing effect increases
Solution Approach 1:
The catch thread is extracted from the surface and placed between the warp threads, where it is covered by the weft and/or warp threads. This removes the harmful catch thread from the surface while preserving its essential function of retaining the weft thread during weaving, thus eliminating the sawing effect without compromising weaving reliability.
Solution Approach 2:
The catch thread is nested between the warp threads and covered by the weft and/or warp threads, creating a layered structure where the catch thread is hidden within the fabric structure. This nesting approach allows the catch thread to perform its function while being invisible from the surface, resolving the contradiction between reliability and surface quality.
2Ease of manufacture
If the catch thread is placed on the surface, then the weaving process is simpler, but the edges are inhomogeneous and wear differently
Solution Approach 1:
The catch thread is positioned in a specific location between the warp threads rather than on the surface, creating a localized structural arrangement. This local quality change ensures that the catch thread's function is maintained in the interior while the surface maintains uniform quality and homogeneous edges.
Solution Approach 2:
The catch thread is moved from the surface dimension to an interior dimension between the warp threads. This dimensional relocation allows the catch thread to remain functional while being hidden within the fabric structure, achieving homogeneous edges without complicating the weaving process.
3Ease of manufacture
If the catch thread appears on the surface, then manufacturing is simpler, but the seat belt webbing makes additional noise during retraction and extraction
Solution Approach 1:
The catch thread is extracted from the surface and repositioned between the warp threads, removing the source of noise generation from the surface. This extraction eliminates the additional noise during retraction and extraction while preserving the manufacturing simplicity through the straightforward structural arrangement.
4Device complexity
If the catch thread is on the surface, then the structure is simpler, but the seat belt webbing gives the optical impression of being of lower value
Solution Approach 1:
The catch thread is extracted from the visible surface and placed in the interior between the warp threads. This removal from the surface eliminates the negative optical impression while maintaining structural simplicity through the straightforward nested arrangement.
Solution Approach 2:
The catch thread is nested within the fabric structure between the warp threads and covered by the weft and/or warp threads. This nesting creates a clean, uniform surface appearance that conveys higher value while maintaining simple structural complexity through the integrated design.
Data Source
AI summary
A seat belt webbing has 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).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).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.