Footwear Sole Chassis and Bladder for Cushioning Stability

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Solution Overview

Problem

Conventional sole structures for footwear lack a comprehensive cushioning system that effectively attenuates impact forces and provides stability, particularly in regions that experience significant loads during lateral movements.

Innovation Solution

A composite midsole structure comprising a bladder supported within a chassis, featuring a bladder with opposing barrier layers forming a sealed chamber and a tensile element, and cushioning elements that enhance cushioning and stability by integrating a resilient polymeric material and a ground-engaging outsole.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional midsole with a fluid-filled bladder is used, then cushioning is provided by compressing the bladder under load, but the system lacks comprehensive impact attenuation and stability in high-load regions

Engineering Contradiction:

Improvecushioning effectivenessVSAvoidsole structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sole structure is divided into distinct functional segments: a midsole providing general cushioning, an outsole with high-density foam for impact attenuation, and a chassis with tensile elements for stability. This segmentation allows each component to specialize in specific functions, improving overall reliability without excessive complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs composite materials including fluid-filled bladders combined with polymeric foam, and high-density foam integrated with structural chassis elements. These composite constructions provide both cushioning and impact attenuation properties that single materials cannot achieve alone.

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If the midsole compresses resiliently to cushion the foot, then cushioning is achieved, but impact forces are not sufficiently attenuated in high-load regions

Engineering Contradiction:

ImprovecomfortVSAvoidimpact force attenuation

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The outsole incorporates a high-density polymeric foam material specifically in regions designed to engage the ground surface, creating local zones of high impact attenuation. This allows the midsole to remain soft and comfortable while the outsole handles heavy impact forces locally.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The structural chassis with tensile elements and the high-density foam in the outsole are positioned beforehand to intercept and attenuate impact forces before they reach the foot. This preemptive cushioning protects against shock loads before they can cause discomfort or injury.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If a bladder with barrier layers sealed together is used, then the bladder contains fluid for cushioning, but stability in high-load regions during lateral movements is insufficient

Engineering Contradiction:

Improvecushioning consistencyVSAvoidstability during lateral movements

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent merges the fluid-filled bladder with a structural chassis that includes tensile elements. This combination integrates the cushioning function of the bladder with the stabilizing function of the chassis, providing both consistent cushioning and stability during lateral movements.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The tensile elements in the chassis are designed with specific material properties and geometric configurations that change their mechanical parameters under load. These elements become stiffer under lateral stress, providing dynamic stability that adapts to the forces applied during movement.

Inventive Principle:

Principle #35Parameter changes

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 cushioning and stability by attenuating impact forces and improving support in high-load regions, ensuring a comfortable and responsive footwear experience.

Implementation Method 1

designed with an emphasis on balancing support for the foot and cushioning characteristics that relate to responsiveness as the bladder resiliently compresses under an applied load to cushion the foot by attenuating ground-reaction forces

Methodology Applied

Scientific EffectResilient compression: Elasticity

Data Source

PatentUS12471669B2Sole structure for article of footwear

Publication Date: 2025.11.18 NIKE INC

AI summary

A sole structure for an article of footwear, the sole structure defining a footbed and a ground-engaging surface and including a chassis extending from an anterior end of the sole structure to a posterior end of the sole structure, and a bladder supported within the chassis and extending from a first end in a forefoot region of the sole structure to a second end exposed at the posterior end of the sole structure, the bladder including a first curved portion in the forefoot region and a substantially flat portion at the posterior end of the sole structure.