Magnetic Handle Interface for Bidirectional Vibration Decoupling

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Solution Overview

Problem

Existing vibrational decoupling solutions for power tools like lawnmowers and line trimmers are inadequate in providing effective bidirectional decoupling and are limited by linear spring forces or incompatible magnetic principles, which fail to adequately reduce operator discomfort and risk of carpal tunnel syndrome.

Innovation Solution

A vibrational decoupling interface using a housing with a channel containing a first and second magnet and a travelling magnet, where the travelling magnet is repelled by both, providing a nonlinear magnetic repulsive force that biases it towards the center, and assisted by compression springs for enhanced decoupling, allowing pivotal coupling and bidirectional operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If linear spring forces are used for vibrational decoupling, then the device structure is simple, but the decoupling effectiveness is insufficient and cannot provide adequate bidirectional decoupling

Engineering Contradiction:

Improvedevice structureVSAvoiddecoupling effectiveness

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent replaces the traditional linear mechanical spring system with a magnetic field-based decoupling mechanism. The magnetic decoupling interface uses magnetic repulsion forces between magnets to create a non-linear restoring force that effectively decouples vibrations in both pushing and pulling directions, overcoming the limitations of linear spring forces while maintaining structural simplicity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces non-linearity into the decoupling system by using magnetic field interactions. The magnetic repulsion force varies non-linearly with displacement, providing enhanced decoupling effectiveness at different vibration amplitudes. This parameter change from linear to non-linear force characteristics significantly improves bidirectional decoupling performance.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If existing magnetic principles are used, then bidirectional decoupling is attempted, but the principles are incompatible and fail to reduce operator discomfort

Engineering Contradiction:

Improvebidirectional decouplingVSAvoidoperator discomfort

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a magnetic decoupling interface as an intermediary element between the power tool handle and the operator's hand. This interface uses magnetic repulsion forces to actively counteract vibrations transmitted to the operator, providing effective bidirectional decoupling and reducing carpal tunnel syndrome risk without the incompatibility issues of previous magnetic solutions.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If tension springs acting in opposition are used, then some vibrational decoupling is achieved, but the solution is inadequate for comprehensive bidirectional decoupling

Engineering Contradiction:

Improvevibrational decouplingVSAvoidspring arrangement

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the complex arrangement of opposing tension springs with a single magnetic decoupling interface that provides bidirectional decoupling through magnetic repulsion. This substitution eliminates the need for multiple opposing springs while achieving superior decoupling effectiveness in both pushing and pulling directions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 effectively reduces vibrations in both pushing and pulling motions, providing enhanced decoupling compared to linear spring forces and existing magnetic solutions, while allowing pivotal coupling and reducing operator discomfort.

Implementation Method 1

The magnets are arranged such that the travelling magnet repels the first and second magnets and the travelling magnet is coupled to the other shaft

Methodology Applied

Scientific EffectMagnetic repulsion: Magnetism

Implementation Method 2

Biasing mechanisms including compression springs may assist the magnets for end of range vibrational decoupling

Methodology Applied

Scientific EffectElastic force: Spring

Data Source

PatentUS12085136B2Vibrational decoupling interface

Publication Date: 2024.09.10 BAILEY DEON

AI summary

A vibrational decoupling interface connects between handle shafts of power tools such as lawnmowers, line trimmers and the like. The interface has a housing coupled to one of the shafts and having a channel having a first magnet at a first end thereof and a second magnet at a second end thereof. The channel further has a travelling magnet travelling between the first and second magnets, the magnets arranged such that the travelling magnet is repelled from the first and second magnets and the travelling magnet is coupled to the other shaft to thereby reduce the transmission of vibration between the shafts.