Footwear Sole Structure With Flush Inserts and Visible Fluid Bladder

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Solution Overview

Problem

Existing sole structures for footwear lack transparency and visibility into the fluid-filled bladders, which can hinder the aesthetic appeal and user interaction with the internal components.

Innovation Solution

Incorporating a strobel made of translucent or transparent materials, allowing visibility through the upper of the footwear, and a fluid-filled chamber that can be seen through openings or perforations, along with a transparent or translucent insole, providing a clear view of the underlying components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If traditional opaque materials are used for the strobel and insole, then the structural integrity and durability are maintained, but the aesthetic appeal and user interaction with internal components are reduced

Engineering Contradiction:
Improveaesthetic appealVSAvoidvisibility into internal components
Core Design Contradiction:
Ease of manufactureVSReliability

Solution Approach 1:

The strobel and insole materials are changed from opaque to translucent or transparent, altering the optical parameter of the materials to enable visibility into the fluid-filled bladder while maintaining structural integrity and durability

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent applies color/transparency changes by using translucent or transparent materials for the strobel and insole, allowing the internal fluid-filled bladder to be visible through these components, thereby enhancing aesthetic appeal and user interaction

Inventive Principle:
Principle #32Color changes

2Reliability

If the strobel and insole are made opaque for durability, then protection is provided, but visibility into the fluid-filled bladder is blocked

Engineering Contradiction:
ImproveprotectionVSAvoidvisibility
Core Design Contradiction:
ReliabilityVSLoss of information

Solution Approach 1:

The optical parameter of the strobel and insole materials is changed from opaque to translucent/transparent, enabling light transmission while maintaining the protective function of these components

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

By changing the color/transparency characteristic of the strobel and insole materials to translucent or transparent versions, the patent enables visibility into the fluid-filled bladder while preserving the protective function of these layers

Inventive Principle:
Principle #32Color 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

Enhances the aesthetic appeal and user interaction by allowing visibility into the internal components, while maintaining the functionality of the fluid-filled bladder for cushioning and support.

Implementation Method 1

a strobel (104) attached to the upper and formed from one of a translucent material and a transparent material

Methodology Applied
Scientific EffectLight transmission through translucent/transparent material: Refraction

Implementation Method 2

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

Methodology Applied
Scientific EffectResilient compression: Elasticity

Implementation Method 3

The fluid-filled bladders are pressurized with a fluid such as air

Methodology Applied
Scientific EffectFluid pressure: Pressure Increase

Data Source

PatentEP4447741B1Sole structure for article of footwear
Publication Date: 2025.09.10 NIKE INNOVATE CV
  • EP4447741B1 patent drawingFigure 1
  • EP4447741B1 patent drawingFigure 2
  • EP4447741B1 patent drawingFigure 3A~3B

AI summary

A sole structure for an article of footwear includes a bladder and at least one insert. The bladder includes an upper surface having a first portion defining a chamber and a second portion defining at least one recess adjacent to the chamber. The at least one insert is disposed within the at least one recess and has a top surface that is substantially flush with the first portion of the upper surface of the bladder. The first portion of the upper surface is exposed to the at least one insert.