Stacked Forefoot Bladders for Cushioning and Motion Control
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Solution Overview
Problem
Existing sole structures for footwear lack optimal cushioning and impact protection, particularly in the forefoot region, while also requiring improved motion control and responsiveness.
Innovation Solution
A sole structure with stacked forefoot cushioning components, each containing a bladder with a gas-retaining interior cavity and a tensile component, is designed to provide enhanced cushioning and impact protection. The components are stacked over a foam midsole layer, and a strobel extends over these components, with a plate in the midfoot region for additional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple bladders are stacked in the forefoot region, then cushioning and impact protection are improved, but device complexity increases
Solution Approach 1:
The sole structure is divided into multiple separate bladder components (first bladder component, second bladder component, third bladder component) stacked in the forefoot region. Each bladder is a discrete element that can be independently manufactured and assembled, allowing the system to provide enhanced cushioning through multiple layers while maintaining manufacturing feasibility through modular construction
Solution Approach 2:
The bladders are stacked one on top of another in a nested arrangement within the forefoot region of the footwear. The first bladder component is positioned at the foot-facing surface, with the second and third bladder components stacked beneath it, creating a layered protective structure that maximizes cushioning efficiency within the available space
2Stability of the object's composition
If tensile components are added to the bladders, then motion control is improved, but device complexity increases
Solution Approach 1:
The tensile components are integrated into each bladder structure to serve multiple functions simultaneously: they provide motion control by limiting excessive bladder expansion, maintain the structural integrity of each bladder, and contribute to the overall stability of the stacked cushioning system. This multi-functionality reduces the need for separate motion control mechanisms
3Reliability
If stacked bladders are used in the forefoot region, then impact protection is improved, but manufacturing difficulty increases
Solution Approach 1:
The cushioning system is segmented into separate bladder components that can be manufactured independently using standard molding or bonding processes. Each bladder can be produced as a discrete unit and then assembled into the stacked configuration, simplifying the overall manufacturing process compared to creating a single complex multi-chamber structure
Solution Approach 2:
The bladders are constructed using flexible polymeric sheets that can be bonded together to form sealed interior cavities. This approach allows for easy manufacturing through conventional lamination and sealing techniques, and the flexible nature of the materials enables the bladders to be stacked and integrated into the footwear sole structure without requiring complex rigid frameworks
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 improved cushioning, impact protection, and motion control by utilizing multiple bladders and tensile components, enhancing the overall responsiveness and stability of the footwear.
Implementation Method 1
The bladder may include a first polymeric sheet and a second polymeric sheet bonded to the first polymeric sheet to enclose the interior cavity
Implementation Method 2
A tensile component may be disposed in the interior cavity and may limit the outward expansion of the bladder
Implementation Method 3
The foam midsole layer may have a foot-facing surface extending in each of the forefoot region and the midfoot region
Data Source
AI summary
An article of footwear has a sole structure that includes a foam midsole layer. A first forefoot cushioning component is secured to the foot-facing surface of the foam midsole layer in the forefoot region, a second forefoot cushioning component overlies the first forefoot cushioning component, and a strobel extends at least in the forefoot region and the midfoot region and over the second forefoot cushioning component. One or more of the forefoot cushioning component, the second forefoot cushioning component, and the strobel may include 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.