Shoe Sole Ligatures for Stability and Cushioning
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Solution Overview
Problem
Shoes with cushioning layers, such as air bladders, often experience lateral and longitudinal instability due to competing requirements for stability and cushioning, leading to reduced vertical compressibility and shock absorption.
Innovation Solution
A shoe sole assembly with tensioned and angularly oriented ligatures that interconnect the insole and outsole, providing stability against lateral and vertical forces, and an internal pump for pressurizing the air bladder to enhance cushioning and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick and compliant cushioning section is used between outsole and insole, then shock absorption is improved, but lateral stability deteriorates
Solution Approach 1:
The cushioning section is segmented into multiple air cells instead of a single monolithic bladder. Each air cell is independently surrounded by rigid sidewalls that provide lateral stability, while the collection of cells maintains overall cushioning effectiveness through distributed compliance.
Solution Approach 2:
Different regions of the sole assembly have different rigidity characteristics. The sidewalls of air cells and the ligatures provide localized rigidity to prevent lateral rolling, while the air cushioning material within cells maintains local compliance for shock absorption.
2Stability of the object's composition
If air cell sidewalls are made rigid to improve stability, then lateral stability is improved, but vertical compressibility deteriorates
Solution Approach 1:
The cushioning system is divided into discrete air cells with rigid sidewalls. The sidewalls provide lateral stability while the air-filled interior of each cell maintains vertical compressibility, allowing the structure to be stable laterally while remaining compliant vertically.
Solution Approach 2:
The air cell structure combines rigid sidewall material with compressible air-filled interior, creating a composite structure that exhibits different mechanical properties in different directions - rigid laterally but compliant vertically.
3Stability of the object's composition
If ligatures are added to stabilize the shoe upper, then lateral stability is improved, but device complexity increases
Solution Approach 1:
The ligatures serve multiple functions: they provide lateral stability by preventing excessive rolling, they distribute loads across the sole assembly, and they work synergistically with the air cell structure to maintain overall shoe integrity without requiring additional separate stabilization components.
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 enhances stability and traction by allowing the shoe upper to tilt relative to the outsole, maintaining ground contact and improving shock absorption, while maintaining the cushioning properties of the air bladder.
Implementation Method 1
the cushioning section comprises an air bladder
Implementation Method 2
compress the cushioning section between its uncompressed and fully compressed extremes
Implementation Method 3
A plurality of ligatures interconnect the insole and the outsole, respectively, by way of the cushioning section. The ligatures are tensioned and angularly oriented so as to control movement of the upper relative to the outsole.
Data Source
AI summary
To provide cushioning and stability, a shoe has a sole section and an upper, the sole section comprising an outsole having a lower surface for contacting the ground, an insole and cushioning between the insole and the outsole. In addition, the shoe has a plurality of ligatures interconnecting the insole and the outsole, respectively, by way of the cushioning section. The ligatures control movement of the shoe upper relative to the outsole in at least two directions.