Diagonally Asymmetric Insole Stitching for Lightweight Boot Stability
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Solution Overview
Problem
Conventional hiking or work boots are heavy, leading to fatigue in the legs due to the additional weight with each step, and existing lightweight footwear solutions may compromise stability and support.
Innovation Solution
The footwear assembly features diagonally opposing reinforced insole portions with asymmetric stitching and adhesive attachment, providing a lightweight and stable platform by distributing load effectively throughout the gait cycle, with specific flanges stitched or wrapped around the insole board to enhance support and stability without direct engagement on the top surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional heavy boots are used to provide stability and support, then stability and support are improved, but weight increases causing leg fatigue
Solution Approach 1:
The insole board is segmented into different zones (heel portion, forefoot portion, arch portion) with different attachment methods. The lateral forefoot flange is stitched only to the forefoot portion, while the lateral arch flange and lateral heel flange are wrapped around and attached only to the arch portion and heel portion respectively, creating a segmented attachment system that reduces overall weight while maintaining stability in critical areas
Solution Approach 2:
Different attachment methods are applied to different portions of the insole board based on local requirements. Stitching is applied only where needed (forefoot and heel portions) rather than uniformly across the entire insole board, and wrapping is applied specifically to the arch portion. This localized approach provides stability where structurally necessary while minimizing weight in less critical areas
2Weight of moving object
If lightweight construction is used to reduce weight, then weight is reduced, but stability and support may be compromised
Solution Approach 1:
The attachment pattern is asymmetric with respect to the insole board. The lateral forefoot flange is stitched to the top surface of the forefoot portion, while the lateral arch flange and lateral heel flange are wrapped around and attached to the bottom surface. This asymmetric attachment configuration optimizes stability in specific load-bearing areas while maintaining lightweight construction overall
Solution Approach 2:
The attachment method transitions from two-dimensional stitching on the top surface to three-dimensional wrapping around the edges and attachment on the bottom surface. The lateral arch flange and lateral heel flange are wrapped around the peripheral edges of the insole board, creating a multi-dimensional attachment that enhances stability without adding significant weight
Data Source
AI summary
A footwear assembly has a sole assembly with an insole board having a peripheral edge, a heel portion, a forefoot portion, and an arch portion. The insole board has a lateral side, a medial side, a top surface, and a bottom surface facing away from the top surface. The footwear assembly has an upper with a lower side portion having a lateral forefoot flange, a lateral arch flange, a lateral heel flange, a medial forefoot flange, a medial arch flange, and a medial heel flange. The lateral forefoot flange is stitched to the top surface of the insole board along the forefoot portion, and the lateral arch flange and the lateral heel flange wrap around the peripheral edge along the insole board's lateral side and are attached to the bottom surface at the arch portion and heel portion without being stitched to the insole board's top surface. The medial heel flange is stitched to the top surface of the insole board along the heel portion portion, and the medial arch flange and the medial forefoot flange are wrapped around peripheral edge along the insole board's lateral side and are attached to the bottom surface at the arch portion and forefoot portion without being stitched to the insole board's top surface.