Wire Hook Web Strap Attachment for Quiet Metal Seat Frames
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Solution Overview
Problem
Existing methods for attaching elastomeric webbing to steel frames in seating products are inefficient, costly, and prone to failure under impact loads, leading to inconsistent tension, noise, and wear, as well as breakage and deterioration of materials during cycle and drop tests.
Innovation Solution
A wire hook design with a straight main portion and L-shaped portions that secure the webbing to a metal frame without extra wire or deformation, eliminating the need for collars and reducing contact with cushioning materials, thereby enhancing durability and reducing noise and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wire hooks with flat sections and bends are used to attach webbing to metal frames, then the webbing can be secured to the frame, but the wire hooks are prone to breakage during cycle testing at the bends where the wire emerges from the end loop of the webbing
Solution Approach 1:
The wire hook is formed from a single continuous wire with consistent curvature throughout its structure, eliminating sharp bends and flat sections that create stress concentration points. The wire maintains a uniform rounded profile from the hook tip through the webbing engagement area to the frame engagement point, preventing breakage during cycle testing while maintaining structural integrity.
Solution Approach 2:
The wire hook design segments the functional areas into distinct zones: a hook tip for frame engagement, a curved body for webbing passage, and an expanded end for secure webbing attachment. This segmentation allows each zone to be optimized for its specific function while maintaining overall structural strength and eliminating weak points.
2Reliability
If wire hooks are used to attach webbing to metal frames, then the attachment can be made, but movement of the wire hooks in the holes causes noise and wear
Solution Approach 1:
The consistently curved wire hook design allows it to flex and conform within the frame hole without creating sharp edges or flat surfaces that would cause binding or movement. The rounded profile enables smooth rotation and positioning, eliminating the scratching and noise associated with traditional wire hooks that have flat sections.
3Reliability
If traditional wire hooks with collars or sewn seams are used to secure webbing, then the webbing can be attached to the wire hook, but the flat part of the hook can deform under impact loads causing loss of support
Solution Approach 1:
The wire hook maintains consistent curvature throughout its structure, including the area where the webbing is secured. This eliminates flat sections that would deform under impact loads. The rounded, uniformly thick wire profile distributes stress evenly and resists deformation during cycle and drop tests, maintaining webbing support integrity.
Solution Approach 2:
The wire hook is constructed from high-strength, impact-resistant wire material that combines flexibility with durability. This composite approach uses a single material optimized for both flexibility during assembly and strength during impact testing, eliminating the need for separate collar components or sewn seams that could fail.
Data Source
AI summary
A seating product is provided which comprises a metal frame, straps of webbing joined to the metal frame with wire hooks. Each of the wire hooks has a main portion inside a loop created in the strap of webbing and two L-shaped portions extending through openings in the metal frame. Each of the L-shaped portions reduces movement of the wire hooks inside the metal frame reducing noise and wear. The metal frame is made of two pieces joined together, one of the pieces being straight and the other being generally U-shaped.