Footwear Sole Structure With Stacked Bladders for Zonal Cushioning
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Solution Overview
Problem
Conventional fluid-filled bladders in footwear sole structures focus on balancing support and cushioning but lack efficient zonal cushioning and performance characteristics, particularly in areas like the heel and forefoot regions, leading to suboptimal comfort and performance.
Innovation Solution
A composite midsole structure with a foam element, anterior and posterior cushioning arrangements, and an overmolded outsole, incorporating stacked bladders and tensile members to provide zonal cushioning and enhanced ground-engaging surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional fluid-filled bladders are used in midsoles, then support and cushioning are balanced, but zonal cushioning and performance characteristics are insufficient
Solution Approach 1:
The midsole is divided into multiple independent bladder chambers (heel cushioning chamber, midfoot cushioning chamber, forefoot cushioning chamber) that can be independently filled and adjusted. Each chamber targets specific zones of the foot, providing localized cushioning and support without requiring a completely complex structural redesign of the entire bladder system.
Solution Approach 2:
Different regions of the midsole receive different amounts of fluid injection based on specific performance requirements. The heel region may receive more fluid for impact absorption, while the forefoot region receives less for flexibility, creating locally optimized cushioning characteristics without uniform complexity throughout the entire structure.
2Ease of operation
If fluid is injected into bladder chambers to provide cushioning, then comfort is improved, but manufacturing complexity increases
Solution Approach 1:
The bladder chambers are pre-formed and sealed during the midsole manufacturing process, with injection ports and valves already integrated into the structure. This preliminary preparation allows for simple post-manufacturing fluid injection without requiring complex assembly steps or specialized manufacturing equipment.
Solution Approach 2:
The system includes automatic fluid level sensors and pressure-regulated valves that self-regulate the fluid injection process. When the midsole is manufactured, the system automatically detects when each chamber reaches the appropriate fluid level and stops injection, eliminating the need for manual monitoring and complex control procedures during manufacturing.
3Strength
If tensile members are added to retain bladder shape under compression, then structural integrity is improved, but device complexity increases
Solution Approach 1:
The tensile members are integrated directly into the bladder chamber walls during manufacturing, forming a unified structure where the tensile reinforcement is embedded within the bladder material itself. This merging approach provides shape retention functionality without adding separate, discrete components that would increase assembly complexity.
Solution Approach 2:
The bladder chambers are constructed using composite materials that combine the fluid-containing elastomeric material with embedded tensile reinforcement fibers or layers. This composite construction provides both the flexibility needed for cushioning and the tensile strength for shape retention, achieving dual functionality without adding separate mechanical components.
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 enhances comfort and performance by providing localized cushioning and support, improving responsiveness and durability in key foot regions, while maintaining structural integrity and traction.
Implementation Method 1
The fluid-filled bladders are pressurized with a fluid such as air, and may incorporate tensile members within the bladder to retain the shape of the bladder when compressed resiliently under applied loads
Implementation Method 2
The fluid-filled bladders are pressurized with a fluid such as air
Data Source
AI summary
A sole structure includes a foam element extending from a forefoot region to a heel region. A lower surface of the foam element includes a recess formed in the forefoot region. The sole structure also includes a posterior cushioning arrangement extending along a peripheral region of the sole structure from a heel region to a mid-foot region, and an anterior cushioning arrangement disposed in the recess of the foam element. The anterior cushioning arrangement has a proximal end adjacent to the lower surface of the foam element and a distal end formed on an opposite side of the anterior cushioning arrangement than the proximal end. The anterior cushioning arrangement includes at least one medial bladder proximate to a medial side of the sole structure and at least one lateral bladder proximate to a lateral side of the sole structure.