Composite Footwear Sole Structure with Localized Material Zones
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Solution Overview
Problem
Existing sole structures for footwear lack optimal combinations of durability, traction, and cushioning, particularly in regions subjected to high concentrations of force, leading to uneven wear and reduced performance.
Innovation Solution
A sole structure comprising a composite design with a main body made of foam material and inserts made of rubber, where the inserts are strategically placed in high-force areas to provide enhanced traction and abrasion resistance, while the foam body provides cushioning and support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-material sole structure is used, then manufacturing is simple, but durability and traction are insufficient in high-force regions
Solution Approach 1:
The sole structure incorporates a hard material layer specifically in the ground-contacting surface to provide enhanced durability and abrasion resistance in high-force regions, while the interior layer maintains a softer material for cushioning. This local differentiation of material properties resolves the contradiction by improving reliability where needed without requiring the entire sole to be complex.
Solution Approach 2:
The sole structure uses a composite design with two distinct layers: a hard material layer (e.g., thermoplastic polyurethane, thermoplastic elastomer) for the ground-contacting surface and a softer material layer (e.g., foam) for the interior. This composite approach enables the sole to simultaneously achieve durability through the hard outer layer and comfort through the softer inner layer, resolving the contradiction between reliability and simplicity.
2Reliability
If a hard material is used for the entire sole, then abrasion resistance improves, but cushioning performance deteriorates
Solution Approach 1:
The sole structure applies the hard material specifically to the ground-contacting surface layer where abrasion resistance is critical, while the interior layer uses a softer, more compliant material to provide cushioning. This localized application of different material properties resolves the contradiction by ensuring abrasion resistance where it is needed without sacrificing comfort.
Solution Approach 2:
The two-layer composite structure combines a hard, abrasion-resistant material layer with a softer, cushioning material layer. The hard layer protects against wear and tear from ground contact, while the softer layer absorbs impact forces and provides comfort, thereby resolving the contradiction between abrasion resistance and cushioning performance.
3Object-generated harmful factors
If a soft material is used for the entire sole, then cushioning improves, but traction and durability deteriorate
Solution Approach 1:
The sole structure places the soft material in the interior layer to provide cushioning and comfort, while the ground-contacting surface layer uses a hard material with appropriate surface characteristics for traction. This spatial separation of functions resolves the contradiction by ensuring that cushioning is provided where needed without compromising traction at the ground interface.
Solution Approach 2:
The composite two-layer design combines a soft cushioning material with a hard traction-providing material. The soft layer absorbs impact and provides comfort, while the hard outer layer maintains reliable traction and durability during ground contact, thereby resolving the contradiction between cushioning performance and traction.
4Reliability
If uniform sole geometry is used, then manufacturing is easy, but force distribution is uneven leading to accelerated wear
Solution Approach 1:
The sole structure implements non-uniform geometry with varying thickness across different regions: the ground-contacting surface layer is thinner in high-force areas (heel, toe) to allow better force distribution, while the interior layer provides thicker cushioning in regions requiring shock absorption. This localized geometric variation resolves the contradiction by improving wear resistance through optimized force distribution without excessive manufacturing complexity.
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 composite sole structure offers improved durability, traction, and cushioning by distributing force effectively, minimizing abrasion and enhancing overall footwear performance.
Implementation Method 1
The midsole provides cushioning for the foot and may be partially formed from a polymer foam material that compresses resiliently under an applied load to cushion the foot by attenuating ground-reaction forces
Implementation Method 2
The midsole provides cushioning for the foot and may be partially formed from a polymer foam material that compresses resiliently under an applied load to cushion the foot by attenuating ground-reaction forces
Implementation Method 3
The midsole may additionally or alternatively incorporate a fluid-filled bladder to increase durability of the sole structure, as well as to provide cushioning to the foot by compressing resiliently under an applied load to attenuate ground-reaction forces
Implementation Method 4
The outsole provides abrasion-resistance and traction with the ground surface
Data Source
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AI summary
A sole structure for an article of footwear comprises a main body formed of a first material and defining a first region of a ground-engaging surface including a first channel. The first channel includes a plurality of segments, the plurality of segments (i) extending between a lateral side and a medial side of the sole structure, (ii) being serially end-to-end arranged, (iii) being arranged at alternating angles to each other to define a waveform pattern, and (iv) including at least one segment having sidewalls that provide the at least one segment with a variable width along a length of the at least one segment. The plurality of segments includes a first segment extending along a first segment axis, a second segment extending along a second segment axis disposed at an oblique angle with respect to the first segment axis, and a third segment extending along a third segment axis that is substantially parallel to the first segment axis and oblique to the second segment axis.