Oscillating Tool Eccentric Drive for Adjustable Angular Amplitude
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Solution Overview
Problem
Existing oscillating power tools lack an efficient mechanism for adjusting the angular amplitude of oscillation, which limits their versatility and effectiveness in various cutting and sanding operations.
Innovation Solution
The oscillating power tool incorporates a drive mechanism with an eccentric shaft and bearing, coupled with a forked member, and an amplitude adjustment actuator. The actuator includes a first and second actuator portion with actuation surfaces extending through apertures in the housing, allowing for symmetric engagement and adjustment of the eccentric bearing to change the angular amplitude of oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an amplitude adjustment mechanism is added to oscillating power tools, then the adaptability and versatility of the tool is improved, but the device complexity increases
Solution Approach 1:
The patent implements a dynamic adjustment mechanism where the eccentric bearing can be repositioned along the eccentric shaft to change the oscillation amplitude. The actuator portions allow the eccentric bearing to be moved symmetrically, creating a dynamically adjustable system rather than a fixed one, thereby improving adaptability while maintaining manageable complexity through symmetric design.
Solution Approach 2:
The adjustment actuator is divided into first and second actuator portions that symmetrically engage the eccentric bearing. This segmentation allows independent adjustment of each side, enabling precise control of the eccentric bearing position and thus the oscillation amplitude, while distributing the mechanical load and complexity across separate components.
2Adaptability or versatility
If the eccentric bearing is moved to adjust amplitude, then the angular amplitude of oscillation is changed, but the symmetry and balance of the mechanism may be compromised
Solution Approach 1:
The patent intentionally introduces asymmetric elements (the movable eccentric bearing positioned at different locations along the shaft) to achieve the desired function of amplitude adjustment. By allowing controlled asymmetric positioning of the eccentric bearing while maintaining symmetric actuator engagement, the system achieves variable amplitude oscillation while preserving overall mechanical balance.
Solution Approach 2:
The system transitions from a static symmetric configuration to a dynamic one where the eccentric bearing can be repositioned along the shaft. The symmetric actuator design ensures that regardless of the eccentric bearing's position, the adjustment mechanism itself maintains symmetry, preserving balance while enabling amplitude variation.
3Ease of operation
If a symmetric actuator design is used to evenly push the eccentric bearing, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The first and second actuator portions are merged into a single integrated adjustment mechanism that symmetrically engages the eccentric bearing. This merging allows the operator to control both sides simultaneously through a unified interface, improving ease of operation while the shared mechanical structure reduces overall complexity compared to having separate independent actuators.
Solution Approach 2:
The symmetric actuator design allows the mechanism to self-balance during operation. When the operator applies force to adjust the amplitude, the symmetric engagement of the eccentric bearing on both sides automatically ensures even distribution of forces, eliminating the need for additional balancing mechanisms or complex control systems.
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
This solution enables infinite adjustment of the angular amplitude of oscillation, enhancing the tool's versatility and effectiveness in various operations by allowing operators to customize the oscillation amplitude according to specific tasks.
Implementation Method 1
an eccentric member configured to rotate off center about the motor axis
Implementation Method 2
an amplitude adjustment actuator configured to move the eccentric member in the direction generally parallel to the motor axis to change an angular amplitude of oscillating rotation of the forked member
Data Source
AI summary
An oscillating power tool includes a housing, a motor disposed generally within the housing and including a drive shaft, an output spindle configured to be driven by the motor and journaled for oscillating rotation about an oscillation axis, a drive mechanism configured to convert rotation of the drive shaft into oscillating rotation of the output spindle about the oscillation axis, the drive mechanism including an eccentric member configured to rotate off center about the motor axis, and a forked member operatively coupled to the eccentric member and configured for oscillating rotation about the oscillation axis in response to rotation of the eccentric member, and an amplitude adjustment actuator configured to move the eccentric member in the direction generally parallel to the motor axis to change an angular amplitude of oscillating rotation of the forked member.