Power Tool Vibration Dampening Using Hollow Cylindrical Isolators
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Solution Overview
Problem
Hand-held power tools generate vibrations that cause operator fatigue and interfere with control, with existing solutions like padded handles being ineffective in reducing vibrations to a sufficient level, especially under new regulatory standards.
Innovation Solution
A vibration dampening system using four hollow cylindrical compressible dampeners positioned between the motor and handle, allowing for relative movement and providing lateral stability and torsion control, with different stiffness options for optimal vibration reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If padded handles are used to dampen vibrations, then some vibration reduction is achieved, but the vibration reduction is insufficient to meet regulatory standards and minimize operator fatigue
Solution Approach 1:
The patent introduces vibration dampeners as intermediary elements positioned between the motor housing and handle assembly. These dampeners act as mediators that absorb and dissipate vibration energy, preventing direct transmission to the operator's hand. The dampeners are specifically placed at locations where vibrations are generated and transmitted, creating an isolation layer that effectively reduces harmful vibrations while maintaining structural integrity.
Solution Approach 2:
The patent employs vibration dampeners with specific material properties and geometric parameters optimized for vibration absorption. The dampeners are designed with particular dimensions, material composition, and positioning parameters that enable them to effectively attenuate vibrations across different frequency ranges. By carefully selecting and adjusting these parameters, the system achieves vibration reduction levels that meet or exceed regulatory standards.
2Ease of operation
If vibration isolation systems are designed to provide lateral stability and torsion control, then operator control is improved, but device complexity increases
Solution Approach 1:
The vibration dampeners are designed to perform multiple functions simultaneously: they provide vibration isolation, maintain lateral stability, enable torsion control, and support structural loading. By integrating these multiple functions into single components rather than using separate elements for each function, the system achieves comprehensive operator control and stability without proportionally increasing complexity.
Solution Approach 2:
The patent combines vibration isolation functionality with the existing structural components of the power tool. The dampeners are integrated into the assembly where the handle meets the motor housing, merging the vibration reduction function with the structural connection function. This integration allows the system to provide both stability and vibration isolation through a unified design rather than adding separate complex subsystems.
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 system effectively isolates handle vibrations from the tool body, reducing operator fatigue and compliance with regulatory standards while allowing for easy assembly and cost-effective production.
Implementation Method 1
The dampeners absorb mechanical energy as it is transferred from the body of the tool to the handle portion
Implementation Method 2
four hollow cylindrical compressible, resilient dampeners positioned in interference in openings between tubular bosses and pockets in the housing halves
Data Source
AI summary
A power tool includes a body and a housing surrounding at least a portion of the body. The power tool also includes a first isolator positioned between the body and the housing and in contact with the body and the housing. The power tool also includes a first fastener connected to the housing to position the first isolator with respect to the housing.