Electrostatic Discharge Insole With Woven Conductive Threads And 3D Support

Solution Overview

Problem

Existing insoles for electrostatic discharge footwear are uncomfortable due to stitched conductive threads or large holes, lack heel cup and arch support, and occupy too much volume, particularly in work footwear.

Innovation Solution

An insole with conductive threads woven into the fabric cover, a foam layer with electrostatic discharge additive, and a 3D supportive shape, including a heel cup and arch support, to provide efficient discharge pathways while maintaining comfort and accommodating various footwear.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conductive threads are stitched through the insole to provide electrostatic discharge pathway, then electrostatic discharge resistance is reduced, but comfort deteriorates due to ridges and recesses formed by stitching

Engineering Contradiction:

Improveelectrostatic discharge resistanceVSAvoidcomfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the mechanical stitching system with a chemical/conductive integration system. Conductive material is embedded within the foam layer during manufacturing, eliminating the need for post-manufacturing stitching. This substitution removes the mechanical ridges and recesses that cause discomfort while maintaining the electrostatic discharge pathway through the conductive foam structure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses composite materials by integrating conductive particles or fibers into the foam matrix, creating a multi-phase composite structure. This composite approach allows the foam to simultaneously provide cushioning comfort and electrostatic discharge functionality without the need for separate conductive thread stitching, thereby resolving the contradiction between comfort and ESD performance.

Inventive Principle:

Principle #40Composite materials

2Reliability

If increased stitching is performed to lower resistance to 30 mega ohms level, then electrostatic discharge resistance is improved, but comfort deteriorates further due to more ridges and recesses

Engineering Contradiction:

Improveelectrostatic discharge resistanceVSAvoidcomfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the mechanical stitching system with a chemical/conductive integration system. Conductive material is embedded within the foam layer during manufacturing, eliminating the need for post-manufacturing stitching. This substitution removes the mechanical ridges and recesses that cause discomfort while maintaining the electrostatic discharge pathway through the conductive foam structure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses composite materials by integrating conductive particles or fibers into the foam matrix, creating a multi-phase composite structure. This composite approach allows the foam to simultaneously provide cushioning comfort and electrostatic discharge functionality without the need for separate conductive thread stitching, thereby resolving the contradiction between comfort and ESD performance.

Inventive Principle:

Principle #40Composite materials

3Reliability

If holes are made in the fabric cover layer to embed conductive material in foam cushion layer, then electrostatic discharge resistance is reduced, but comfort deteriorates due to large holes compromising insole integrity

Engineering Contradiction:

Improveelectrostatic discharge resistanceVSAvoidcomfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent extracts the conductive material embedding process from the post-manufacturing stage and integrates it into the foam layer manufacturing stage. By incorporating conductive material during foam creation, the need to punch holes through the fabric cover is eliminated, preserving the fabric's integrity and comfort properties while achieving the desired electrostatic discharge pathways through the foam structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent performs the conductive material integration action preliminarily during foam manufacturing, before the fabric cover is attached. This preliminary incorporation of conductive material into the foam structure eliminates the need for subsequent hole-punching operations, thereby maintaining the fabric cover's integrity and the insole's overall comfort characteristics.

Inventive Principle:

Principle #10Preliminary action

4Ease of operation

If cushioned electrostatic discharge insoles are designed with full foot coverage, then comfort is improved, but volume occupied increases particularly in the toe region

Engineering Contradiction:

ImprovecomfortVSAvoidvolume

Core Design Contradiction:

Ease of operationVSVolume of moving object

Solution Approach 1:

The patent applies local quality by providing varying thickness levels of the insole across different foot regions. The foam cushion is thicker in areas requiring more support (heel, arch) and thinner in areas requiring less volume (toe region). This localized differentiation maintains comfort in support-critical areas while reducing overall volume occupation in the constrained toe region of work footwear.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent transitions from a uniform two-dimensional insole design to a three-dimensional contoured design that adapts to the foot's anatomy. By shaping the insole with varying thickness and contour in different regions, it achieves optimal comfort support where needed while minimizing volume occupation in the toe area, effectively utilizing the third dimension (thickness) to resolve the volume-comfort contradiction.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 insole offers enhanced comfort, improved foot interface, and efficient electrostatic discharge with reduced volume, suitable for a wide range of footwear.

Implementation Method 1

conductive threads woven into the cover material to provide substantial electrical flow paths from a foot of a wearer to the foam layer

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

An electrostatic discharge chemical additive is added to the base foam layer... creating polarity channels for an electrical pathway within the foam layer

Methodology Applied

Scientific EffectElectrostatic discharge: Electrostatic Discharge

Data Source

PatentUS20250268334A1Electrostatic discharge insole

Publication Date: 2025.08.28 SUPERFEET WORLDWIDE LLC

AI summary

The present invention discloses an advanced insole for electrostatic discharge footwear. The insole features a base foam layer and a fabric top cover with conductive threads woven into the cover material, providing electrical flow paths from a wearer's foot to the base foam layer. An electrostatic discharge chemical additive is incorporated into the base foam layer, creating polarity channels for an electrical pathway within the foam layer. The insole is designed in a 3D supportive shape for increased foot comfort and interface, including a heel cup and arch support. The edges adjacent the toe region are beveled to accommodate various footwear, and the bottom surface of the base foam layer includes molded-in structures that provide varying degrees of cushioning to different regions of the foot. This novel insole design enhances comfort while ensuring efficient electrostatic discharge, proving advantageous in various footwear applications.