Conductive Power Tool Handle Materials for Static Discharge Mitigation

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Solution Overview

Problem

Power tools, such as abrasive saws, accumulate static charge during use, which can be discharged to the operator or tool electronics, posing a shock risk due to the high resistivity of their components and housing materials.

Innovation Solution

Incorporating a conductive additive into the handle materials of power tools to reduce their volume and surface resistivity, creating a path for static electricity to dissipate safely away from the user and electronics, thereby mitigating the risk of static discharge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional handle materials with high resistivity are used, then electrical insulation is improved, but static charge accumulates and discharges to the user causing shock

Engineering Contradiction:

Improveelectrical insulationVSAvoidstatic discharge shock

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent modifies the electrical resistivity parameter of the handle material by incorporating conductive additives (carbon black, graphite, metal particles) to transform the material from high resistivity to low resistivity, enabling static charge dissipation while maintaining safe electrical insulation through controlled conductivity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful static charge accumulation into a beneficial dissipation mechanism by using conductive additives to create controlled charge pathways, transforming the shock hazard into a safe charge distribution system that protects both user and electronics

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Object-affected harmful factors

If conventional handle materials with high resistivity are used, then electrical insulation is improved, but static charge accumulates and discharges to tool electronics causing damage

Engineering Contradiction:

Improveelectrical insulationVSAvoidelectronics protection

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent changes the electrical resistivity parameter of the handle material by incorporating conductive additives, creating a controlled conductivity that prevents static charge accumulation and protects electronics from discharge damage while maintaining appropriate electrical insulation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The conductive additive acts as an intermediary substance within the handle material, mediating between the static charge generation and the electronics, providing a controlled pathway that dissipates charge safely without allowing harmful discharge to reach the electronics

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-generated harmful factors

If conductive additive is incorporated into handle material, then static charge dissipation is improved, but material composition complexity increases

Engineering Contradiction:

Improvestatic charge dissipationVSAvoidmaterial composition

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The patent creates a composite material by combining conventional handle material with conductive additives (carbon black, graphite, or metal particles), achieving static charge dissipation functionality while maintaining the structural and ergonomic properties of the base material through controlled composite formulation

Inventive Principle:

Principle #40Composite materials

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 conductive additive effectively directs static charge away from the tool and user, reducing the likelihood of electrical shocks and preventing damage to tool electronics by providing a lower resistive path for static discharge.

Implementation Method 1

The additive causes the first volume resistivity and the first surface resistivity of the handle to be less than the second volume resistivity and the second surface resistivity of the base material, respectively, such that the base material and the additive are configured to distribute static electricity away from the handle

Methodology Applied

Scientific EffectElectrical Conduction: Conduction (electrical)

Data Source

PatentUS20240300039A1Static discharge mitigation of power tools

Publication Date: 2024.09.12 MILWAUKEE ELECTRIC TOOL CORP

AI summary

A power tool including a handle configured to be grasped by a user, the handle including a base material and an additive configured to distribute static electricity away from the handle. The handle has a first volume resistivity and a first surface resistivity. The base material has a second volume resistivity and a second surface resistivity. The additive causes the first volume resistivity and the first surface resistivity of the handle to be less than the second volume resistivity and the second surface resistivity of the base material, respectively.