Shoe Forefoot Flexibility via Segmented Insole Stitching
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Solution Overview
Problem
Existing shoe designs fail to provide adequate flexibility in the forefoot region while incorporating essential features like comfort, lightweight construction, stability, support, shock absorption, and cushioning, particularly in high heel shoes where space constraints are significant.
Innovation Solution
A shoe structure featuring a flexible insole directly stitched to the upper lining in the forefoot portion, a shank member with a heel portion and cushion basket for shock absorption, and a footbed with a heel pad, which provides a smooth transition from the midfoot to the forefoot, minimizing layers and adhesives for enhanced flexibility and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple layers and adhesives are used in the forefoot portion to provide support, then structural strength is improved, but flexibility deteriorates
Solution Approach 1:
The shoe is divided into distinct functional zones: a forefoot portion with minimal layers for flexibility, and a midfoot/heel portion with the shank member and footbed for support. The insole is segmented to extend only into the forefoot portion without attaching to the shank member, creating a clear separation between flexible and supportive regions.
Solution Approach 2:
Different parts of the shoe have different structural properties optimized for their specific functions. The forefoot portion uses a single-layer flexible insole for flexibility, while the midfoot/heel uses a rigid shank member and footbed with heel pad for support and shock absorption. Each region's structure matches its functional requirements.
2Stability of the object's composition
If a rigid support structure is used in the midfoot portion, then stability is improved, but weight increases
Solution Approach 1:
The shank member and footbed are constructed from composite materials that provide high strength-to-weight ratio. The footbed includes a heel pad made of cushioning material that provides shock absorption without adding significant weight. This composite structure achieves midfoot stability while minimizing weight penalty.
3Ease of operation
If shock absorption features are added to the heel, then comfort is improved, but structural complexity increases
Solution Approach 1:
The heel pad for shock absorption is merged with the footbed structure, forming an integrated component. The footbed is positioned over the heel portion of the shank member, and the heel pad is disposed in the footbed, creating a unified support and cushioning system that reduces overall structural complexity while maintaining comfort functions.
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 solution results in a lightweight, stable shoe with improved flexibility in the forefoot, enhanced shock absorption, and increased comfort by maintaining a minimal number of layers and adhesives, addressing the limitations of previous designs in high heel shoes.
Implementation Method 1
The footbed includes a heel pad disposed in the basket... providing excellent shock absorption
Data Source
AI summary
A shoe with increased flexibility in a forefoot portion that includes an upper, an upper lining, an outsole, a footbed and a flexible insole. The flexible insole is located in the forefoot portion of the upper and is stitched directly to the upper lining along a perimeter of the flexible insole. The footbed includes a heel pad that is located in the heel portion of the shoe.