Footwear Sole Structure With Bottom-Loaded Compression Layer
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Solution Overview
Problem
Existing footwear technologies struggle to provide both comfort and stability for users engaging in activities on uneven surfaces, such as hiking trails, as they often compromise between support for flat surfaces and adaptability for rugged terrain.
Innovation Solution
The design incorporates a sole structure with a midsole and a compression layer insert, where the midsole is formed of a material with a first compression value and the insert has a second, lower compression value. This configuration allows the sole to conform to uneven topography without compromising stability or comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the midsole is made of soft material to conform to uneven surfaces, then comfort is improved, but stability deteriorates
Solution Approach 1:
The sole structure is segmented into three distinct layers: an outsole made of rigid material for stability, a midsole made of compliant material for comfort, and a compression layer inserted into the midsole to prevent excessive compression. This segmentation allows each layer to perform its specific function without compromising the others.
Solution Approach 2:
Different regions of the sole structure have different material properties tailored to their specific functions. The outsole uses rigid material for stability, the midsole uses compliant material for comfort, and the compression layer uses intermediate-compression material strategically placed to control compression in specific areas, creating local quality variations that resolve the contradiction.
2Stability of the object's composition
If the midsole is made of rigid material to provide stability, then stability is improved, but adaptability to uneven surfaces deteriorates
Solution Approach 1:
The sole structure is divided into functional segments where the outsole provides rigidity for stability, the midsole provides compliance for adaptability, and the compression layer provides controlled resistance. This segmentation enables the structure to simultaneously achieve stability and adaptability through coordinated action of different segments.
Solution Approach 2:
The sole structure uses a composite construction combining three different materials with distinct compression properties. The rigid outsole material, compliant midsole material, and intermediate-compression insert material work together as a composite system to achieve both stability and adaptability that neither material could provide alone.
3Adaptability or versatility
If the entire sole is made of soft material to conform to terrain, then adaptability is improved, but excessive compression is transmitted to the user
Solution Approach 1:
The compression layer acts as an intermediary element between the compliant midsole and the user's foot. It mediates the compression forces by providing intermediate-compression resistance, allowing the midsole to conform to terrain while preventing excessive compression from reaching the user.
Solution Approach 2:
The compression layer is positioned beforehand within the midsole to provide pre-configured compression resistance. This prior cushioning mechanism prevents excessive compression before it can be transmitted to the user, rather than relying on the user's foot to absorb the compression after it occurs.
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 effectively enhances traction and stability on uneven surfaces while maintaining comfort by allowing the sole to adapt to irregular terrain without translating excessive compression to the midsole, thus providing a smooth and cushioned experience for the user.
Implementation Method 1
the midsole is formed of a material with a first compression value and the insert has a second, lower compression value
Data Source
AI summary
A sole structure for an article of footwear includes a midsole and an outsole coupled with the midsole. The midsole includes a first compressible material, and a second compressible material that differs from the first compressible material, where a bottom surface of the second compressible material is co-planar with the first compressible material along the bottom surface of the midsole. The outsole includes a ground engaging surface with traction elements extending from the ground engaging surface, and the outsole continuously extends over the first compressible material and the second compressible material.