Segmented Fluid Chambers in Footwear Soles for Forefoot Flexibility
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Solution Overview
Problem
Conventional sole structures for footwear lack targeted support and response for specific movements and activities, failing to provide adequate cushioning and flexibility for various foot regions.
Innovation Solution
A sole structure featuring a midsole with a fluid-filled chamber and a strobel, incorporating a bladder with a notch for enhanced flexibility and a jogged peripheral seam for stability, along with a layered barrier element configuration for improved cushioning and support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous fluid-filled chamber is used throughout the midsole, then cushioning is provided across the entire foot, but flexibility and targeted support for specific regions are compromised
Solution Approach 1:
The fluid-filled chamber is divided into multiple discrete chambers (first chamber in the forefoot region, second chamber in the heel region) rather than using a single continuous chamber. This segmentation allows each region to independently articulate with the foot while maintaining overall cushioning support, resolving the contradiction between continuous cushioning and regional flexibility.
Solution Approach 2:
Different regions of the midsole are assigned different chamber configurations based on local requirements. The forefoot region includes a first chamber optimized for forefoot articulation, while the heel region includes a second chamber for heel support. This local differentiation enables targeted support where needed while maintaining flexibility in other areas.
2Adaptability or versatility
If the sole structure is made more flexible to allow foot articulation, then comfort and adaptability improve, but structural integrity and stability deteriorate
Solution Approach 1:
By segmenting the fluid-filled chamber into discrete sections, each chamber can independently flex and articulate with the foot while maintaining structural integrity through the barrier elements that define each chamber's boundaries. This prevents excessive deformation while allowing necessary movement.
Solution Approach 2:
The sole structure combines multiple materials with different properties: a fluid-filled chamber for cushioning and flexibility, barrier elements for structural definition, and a midsole material that provides overall support. This composite construction allows the structure to be both flexible enough for foot articulation and stable enough to maintain integrity.
3Adaptability or versatility
If targeted support is provided for specific regions like the forefoot, then comfort and performance improve, but device complexity increases
Solution Approach 1:
The fluid-filled chamber is segmented into multiple discrete chambers positioned in different regions (forefoot and heel). Each chamber can be independently configured to provide targeted support for specific areas, achieving regional customization without requiring complex multi-component assemblies or additional active control mechanisms.
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 targeted support and enhanced flexibility, particularly in the forefoot region, by allowing the bladder to articulate with the foot, while maintaining structural integrity and stability.
Implementation Method 1
The midsole may include a pressurized fluid-filled chamber that compresses resiliently under an applied load to cushion the foot by attenuating ground-reaction forces
Implementation Method 2
a pressurized fluid-filled chamber that compresses resiliently under an applied load
Data Source
AI summary
A sole structure for an article of footwear including an upper. The sole structure includes a midsole having a first surface opposing the upper, a second surface disposed on an opposite side of the midsole than the first surface, and an aperture formed through a thickness of the midsole and including a first opening at the first surface and a second opening at the second surface, a first fluid-filled chamber abutting the second surface of the midsole and extending over the aperture at the second opening, and a strobel attached to the upper and extending into the aperture at the first opening, the strobel opposing the first fluid-filled chamber at the aperture.