Rotatable Midsole Structure for Natural Foot Alignment
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Solution Overview
Problem
Traditional footwear disrupts the natural transition sequence of the foot, forcing it into unfavorable rotations about a third axis, compromising foot, ankle, leg, and hip alignment and stability, especially on uneven terrain.
Innovation Solution
A rotatable midsole design that allows movement about the x and y axes while preventing rotation about the z axis, using cavities, protrusions, and ribs to facilitate natural foot motion and maintain alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional footwear uses a rigid sole structure, then stability and support are improved, but foot rotation freedom is restricted causing discomfort and alignment issues
Solution Approach 1:
The midsole is designed with dynamic rotational capability, allowing it to rotate freely about the x-axis and y-axis while being constrained about the z-axis. This dynamic design enables the footwear to adapt to natural foot motion patterns during walking and running, resolving the contradiction between stability and rotation freedom.
Solution Approach 2:
The sole is divided into multiple segments with different rotational characteristics: the midsole can rotate about x and y axes while being constrained about the z-axis. This segmentation allows different parts of the sole to perform different functions - providing stability where needed and freedom of motion where required.
2Reliability
If the footwear restricts foot rotation about the z-axis, then alignment and functional health are improved, but natural motion adaptability is reduced
Solution Approach 1:
Different rotational constraints are applied locally to different axes: the midsole is free to rotate about the x-axis and y-axis to accommodate natural foot motion, but is constrained about the z-axis to prevent harmful twisting. This local differentiation of rotational properties resolves the contradiction between alignment health and motion adaptability.
3Ease of operation
If excessive cushioning and soft materials are used, then comfort is improved, but stability and foot transition capability are compromised
Solution Approach 1:
The midsole uses materials with specific mechanical parameters - sufficiently soft to provide comfort and allow natural foot transition, but sufficiently rigid to maintain stability and prevent excessive deformation. The material properties are optimized to balance comfort and stability, resolving the contradiction between these two requirements.
Data Source
AI summary
A method for manufacturing a footwear apparatus includes placing footwear upper material onto a bottom portion of a midsole mold. The upper material includes a first portion residing within a cavity in the bottom portion of the midsole mold and a second portion extending beyond boundaries of the cavity in the bottom portion of the midsole mold. The method further includes closing a second portion of the midsole mold onto the bottom portion of the midsole mold, injecting midsole mold material into the closed first and second portions of the midsole mold, where the midsole material is fused with the first portion of the upper material, and forming the second portion of the upper material into at least a portion of an upper of the footwear apparatus. The midsole material is attached to the first portion of the upper material without stitching or gluing.