Foam Midsole Bladder Layout for Forefoot Cushioning and Stability
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Solution Overview
Problem
Existing sole structures for footwear lack effective cushioning and impact protection, particularly in the forefoot and heel regions, while also failing to provide adequate motion control and responsiveness.
Innovation Solution
Incorporation of a foam midsole layer with top-loaded forefoot and heel cushioning components, each containing a bladder with a gas-retaining interior cavity and a tensile component, along with a shank in the midfoot region for stability, to enhance cushioning, impact protection, and motion control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a foam midsole layer with bladder cushioning components is used, then cushioning and impact protection are improved, but device complexity increases
Solution Approach 1:
The bladder is nested within the foam midsole layer, with the tensile component positioned inside the bladder's interior cavity. This nested configuration allows the cushioning system to be integrated into the existing midsole structure rather than adding separate external components, thereby improving cushioning while minimizing the increase in overall device complexity.
Solution Approach 2:
The bladder is constructed as a flexible sealed membrane that can deform under compressive loads. This flexible shell approach provides effective cushioning through elastic deformation of the bladder wall and gas compression, achieving reliable impact protection without requiring complex rigid mechanical structures.
2Stability of the object's composition
If a tensile component is disposed in the interior cavity of the bladder, then motion control is improved, but device complexity increases
Solution Approach 1:
The tensile component is positioned locally within the interior cavity of the bladder, specifically arranged to limit outward expansion of the bladder during compression. This localized placement provides motion control where needed while leaving the rest of the midsole structure relatively simple and integrated.
Solution Approach 2:
The tensile component acts as an intermediary element between the bladder and the foot, mediating the deformation behavior during compression. It controls the expansion of the bladder without requiring direct connection to external structures, thereby achieving motion control with minimal added complexity.
3Reliability
If cushioning components are added to the sole structure, then impact protection is improved, but weight increases
Solution Approach 1:
The bladder is inflated with gas to provide cushioning, utilizing pneumatic principles to achieve impact protection. Gas-filled bladders provide effective cushioning per unit weight because gas is much lighter than solid materials, allowing the sole structure to achieve reliable impact protection with minimal weight increase.
Solution Approach 2:
The cushioning properties of the bladder can be adjusted by changing the gas pressure parameter. By optimizing the inflation pressure, the system achieves effective impact protection while minimizing the amount of material and overall weight required, as the same bladder structure can provide different levels of cushioning through parameter adjustment rather than adding more material.
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 provides enhanced responsiveness and impact protection in the forefoot and heel regions, while maintaining stability through the midfoot shank, resulting in improved comfort and performance during various activities.
Implementation Method 1
A bladder is secured to a foot-facing surface of the foam midsole layer. The bladder encloses an interior cavity and is inflated with a gas to a desired pressure. The desired pressure of the gas in the interior cavity of the bladder provides resilient reaction to a compressive load applied to the cushioning component.
Implementation Method 2
A tensile component may be disposed in the interior cavity, and may limit the outward expansion of the bladder.
Data Source
AI summary
An article of footwear has a sole structure that includes a foam midsole layer. A forefoot cushioning component is secured to the foot-facing surface of the foam midsole layer in the forefoot region, and a heel cushioning component is secured to the foam midsole layer at one of the foot-facing surface or the ground-facing surface in the heel region. Each of the forefoot cushioning component and the heel cushioning component includes a bladder and a tensile component. The bladder encloses and retains a gas in an interior cavity. The tensile component is disposed in the interior cavity. The bladder of the forefoot cushioning component has at least one inwardly-protruding bond that joins the inner surface of the bladder to the tensile component, protrudes inward into the interior cavity, and partially traverses a plurality of tethers of the tensile component.