Oscillating Multi-Tool Counterweight Assembly for Vibration Damping
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Solution Overview
Problem
Existing oscillating multi-tools experience significant vibration during operation, which can be uncomfortable and inefficient for users.
Innovation Solution
A vibration dampening assembly is integrated into the power tool, featuring a counterweight that reciprocates along a perpendicular axis to counteract the reversing reaction torque, utilizing two springs to bias the counterweight towards a neutral position, thereby reducing vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a vibration dampening assembly with a reciprocating counterweight is added to the oscillating multi-tool, then vibration transmission to the user is reduced, but device complexity increases
Solution Approach 1:
The patent applies the counterweight principle by incorporating a mass that reciprocates along the oscillation axis in opposition to the tool holder's oscillation. This counterweight generates opposing inertial forces that cancel out the vibrations produced by the oscillating tool accessory, thereby reducing vibration transmission to the user while managing the added complexity through strategic placement and integration into the existing tool structure.
2Reliability
If springs are used to bias the counterweight toward a neutral position, then vibration dampening effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent implements beforehand cushioning by using springs to pre-bias the counterweight toward its neutral position. This ensures that the counterweight is always positioned to provide optimal vibration cancellation before oscillation occurs, and the springs absorb and dampen residual vibrations, enhancing reliability while containing complexity within the dampening assembly module.
3Object-affected harmful factors
If the counterweight reciprocates along an axis perpendicular to both the motor axis and tool holder oscillation axis, then vibration cancellation is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies dimensionality change by positioning the counterweight to reciprocate along a third axis that is perpendicular to both the motor's rotation axis and the tool holder's oscillation axis. This orthogonal arrangement creates a three-dimensional vibration cancellation system where the counterweight's motion in the perpendicular dimension generates forces that effectively counteract vibrations without requiring extremely tight tolerances in the primary oscillation planes, thereby achieving vibration cancellation while managing manufacturing precision requirements.
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 vibration dampening assembly effectively reduces the magnitude of vibrations transmitted to the user, enhancing user comfort and operational efficiency by offsetting oscillating movements.
Implementation Method 1
a counterweight configured to reciprocate along a third axis that is perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis
Implementation Method 2
a first spring adjacent a first end of the counterweight and a second spring adjacent an opposite, second end of the counterweight. The first and second springs bias the counterweight toward a neutral position
Implementation Method 3
The vibration dampening assembly effectively reduces the magnitude of vibrations transmitted to the user, enhancing user comfort and operational efficiency by offsetting oscillating movements
Data Source
AI summary
A power tool includes a housing, a motor that is disposed within the housing and defining a first axis, and a tool holder driven to oscillate about a second axis by the motor. The second axis is perpendicular to the first axis. The power tool also includes a vibration dampening assembly with a counterweight that is configured to reciprocate along a third axis that is perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis.