Multi-Tensile Band Assembly for Wearable Devices
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Solution Overview
Problem
Traditional bands for head-mounted devices lack the ability to effectively manage varying levels of tension, leading to potential damage from excessive stretching or sagging, which compromises the structural integrity and user comfort.
Innovation Solution
A multi-tensile assembly integrated into the band, comprising a stretchable elastomer material, a braided polymer cable, and a metal wire with different tensile strengths, where the elastomer stretches initially, the braided cable absorbs additional tension, and the metal wire acts as a lockout to prevent further elongation, maintaining the band's stability and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the band uses a single stretchable material, then the band can elongate to fit the appendage, but the band may over-stretch or sag under varying tension levels
Solution Approach 1:
The band is divided into multiple functional segments: a stretchable elastomer portion for initial elongation, a braided polymer cable portion for intermediate tension absorption, and a metal wire portion for lockout at maximum tension. Each segment handles specific tension ranges, preventing over-stretching while maintaining adaptability.
Solution Approach 2:
The band combines three different materials with distinct tensile properties: elastomer (high elasticity), braided polymer (intermediate strength), and metal wire (high strength). This composite structure allows the band to progressively resist increasing tension levels, resolving the contradiction between elongation capability and structural integrity.
2Strength
If the band uses a single material with high tensile strength, then the band resists breaking, but the band cannot elongate sufficiently for comfortable wear
Solution Approach 1:
The band is segmented into portions with different tensile characteristics. The elastomer portion provides the necessary elongation for comfortable wear, while the braided polymer and metal wire portions provide progressive resistance to prevent over-stretching. This segmentation allows simultaneous achievement of comfort and strength.
Solution Approach 2:
Different portions of the band have different local properties: the elastomer portion is highly elastic for comfort, while the braided polymer and metal wire portions have progressively higher tensile strengths for structural support. This local differentiation resolves the contradiction between ease of operation and strength.
3Ease of operation
If the band uses a single material with low tensile strength, then the band can elongate easily, but the band may break under excessive tension
Solution Approach 1:
The band is segmented into a stretchable elastomer portion for easy elongation and a braided polymer cable portion with higher tensile strength that engages at intermediate tension levels. The metal wire portion provides final lockout. This segmentation allows the band to elongate easily initially while progressively resisting breaking under excessive tension.
Solution Approach 2:
The braided polymer cable and metal wire are pre-positioned within the elastomer structure to act as progressive reinforcement. As tension increases, these stronger materials engage beforehand to cushion and prevent the elastomer from breaking, while still allowing initial easy elongation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multi-tensile assembly allows for comfortable elongation while protecting the band from excessive tension, preventing sagging and maintaining structural integrity by distributing forces effectively across the band's components.
Implementation Method 1
bands include elastically stretchable material used to conform to the appendage
Implementation Method 2
the assembly includes a stretchable material, a braided cable, and a wire. The tensile strength of the materials of the assembly is based upon the respective makeups
Data Source
AI summary
An assembly with multiple structures, each having different tensile strengths, is integrated into a band used with various electronic devices. The assembly may include a low-tensile structure designed to elongate under an initial tension, thus allowing the band to stretch and lengthen. However, additional tension applied to the band is transferred to other structures of the assembly. Further, when the applied tension causes the structure with the highest tensile strength in the assembly to straighten (or substantially straighten), the high-tensile strength structure prevents the band from further elongation. The low-tensile strength structure allows the band to conform to a user, while the high-tensile strength structure protects the low-tensile strength structure from damage or unwanted deformation.