Wire Hook Webbing Attachment to Metal Frame Without Frame Holes
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Solution Overview
Problem
Existing methods for attaching elastomeric webbing to steel frames in seating products are inefficient, lack consistent tension and spacing, and are prone to failure under impact loads, while also being costly and requiring specific hole patterns in the frame.
Innovation Solution
A seating product design featuring a generally rectangular metal frame with wire hooks that have U-shaped portions to secure webbing straps without the need for holes in the frame, providing consistent tension and durability by eliminating slippage and deformation issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If webbing is attached to steel frame using traditional wire hooks with clamping collars or sewn seams, then the attachment method is simple to implement, but the webbing slips through the collar or the hook deforms under impact loads, causing loss of support
Solution Approach 1:
The wire hook is divided into distinct functional segments: a collarless design where the webbing is sewn to itself around the hook body, separating the attachment function from the tensioning function. This segmentation allows each part to perform its specific function optimally without interference from collars that cause slippage.
Solution Approach 2:
Instead of clamping the webbing to the hook (traditional method), the invention inverts the approach by having the webbing sewn around the hook, with the hook passing through the webbing loop. This inversion eliminates the collar component that causes slippage and distributes loads more effectively across the sewn seam.
2Reliability
If webbing is attached using wire hooks engaged in holes in the steel frame, then the attachment is secure, but the frame requires specific hole patterns that increase manufacturing complexity and cost
Solution Approach 1:
The wire hook design serves multiple functions: it provides secure attachment, eliminates the need for frame holes, and allows flexible positioning. The hook's curved geometry enables it to be secured to the frame surface without requiring pre-drilled holes, making the frame design more versatile and reducing manufacturing steps.
Solution Approach 2:
The invention extracts the hole requirement from the frame design by using wire hooks that can be secured to the frame surface without penetrating holes. This removes the constraint of specific hole patterns from the frame manufacturing process, simplifying production and reducing costs.
3Ease of manufacture
If webbing is attached to steel frame using manual stapling methods, then the process is simple to perform, but it is slow and time-consuming without consistent tension or spacing
Solution Approach 1:
The wire hooks are pre-formed with their characteristic curved geometry and the webbing is pre-sewn into loops with consistent dimensions. This preliminary preparation of components with precise dimensions and shapes enables faster assembly while maintaining consistent tension and spacing, eliminating the need for manual measurement and adjustment during installation.
4Ease of manufacture
If wire hooks are used with clamping collars to attach webbing, then the initial attachment is secure, but the collars allow webbing slippage under cycle test loads
Solution Approach 1:
The invention inverts the traditional clamping approach by eliminating the collar entirely. Instead of clamping the webbing to the hook, the webbing is sewn around the hook body, with the hook passing through the webbing loop. This inversion creates a more secure connection that resists slippage under cyclic loads while maintaining ease of manufacture.
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 U-shaped portions extending outside the metal frame. Each of the U-shaped portions secures the wire hook in place without the use of holes in the metal frame, thereby reducing manufacturing costs. The metal frame may be made of two pieces joined together, one of the pieces being straight and the other being generally U-shaped.