Interlocking Segmented Footwear Midsole and Outsole
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Solution Overview
Problem
Conventional footwear midsoles and outsoles, being unitary pieces, lack versatility and adaptability, restrict the mode of flexing, and inhibit sufficient support due to material differences, such as rubber outsoles limiting foam midsoles' flexibility.
Innovation Solution
The footwear design features interlocking midsole and outsole elements with grooves that separate into multiple elements, allowing for adjustable thickness, material variation, and enhanced flexibility, with aligned grooves enabling secure interlocking and continuous peripheries for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the midsole and outsole are made as unitary pieces, then the structural integrity is maintained, but the versatility and adaptability are reduced
Solution Approach 1:
The midsole and outsole are divided into multiple separate elements (first midsole element, second midsole element, first outsole element, second outsole element) that can be independently configured and assembled. This segmentation allows different zones to have different properties (thickness, material, cushioning) while maintaining overall structural integrity through the interlocking design with grooves and projections.
2Ease of manufacture
If the outsole is fixed to the midsole as a unitary piece, then the manufacturing process is simplified, but the flexibility and support are reduced
Solution Approach 1:
The outsole is segmented into separate elements with grooves that align with corresponding grooves in the midsole elements, creating an interlocking structure. This allows the outsole to be separately configured and assembled with the midsole, enabling independent optimization of flexibility and support properties for each component while maintaining ease of manufacture through modular assembly.
3Reliability
If the outsole is made of rubber and midsole of foam, then the material properties are optimized for traction and cushioning, but the outsole inhibits the midsole from flexing
Solution Approach 1:
By separating the outsole and midsole into multiple elements with aligned grooves, the design allows each material (rubber for outsole, foam for midsole) to be optimized for its specific function (traction and cushioning) while the interlocking structure enables independent flexing and movement, preventing the rigid outsole from inhibiting midsole flexibility.
Solution Approach 2:
Different zones of the midsole and outsole can have different material properties and thicknesses tailored to local requirements. For example, the heel area can have thicker, more cushioning material while the forefoot area has thinner, more flexible material, allowing each region to be optimized for its specific functional needs.
4Reliability
If the midsole thickness is increased for greater cushioning, then the support is improved, but the flexibility is reduced
Solution Approach 1:
The midsole is divided into multiple elements with varying thicknesses and cushioning properties in different zones. This allows the midsole to provide greater cushioning and support where needed (e.g., thicker heel area) while maintaining flexibility in other areas through thinner sections, optimizing both support and flexibility simultaneously.
Data Source
AI summary
An article of footwear that includes an outsole, including an outsole groove that extends generally in a thickness direction through the outsole to separate the outsole into first and second outsole elements. Furthermore, the article of footwear includes a midsole, including a midsole groove that extends generally in a thickness direction through the midsole to separate the midsole into first and second midsole elements. The first midsole element is operably secured to the first outsole element to define a first element assembly, and the second midsole element is operably secured to the second outsole element to define a second element assembly. Furthermore, the outsole groove and the midsole groove are substantially aligned with each other, and the first and second element assemblies interlock with each other.