Cordless Chainsaw Layout for Lateral and Longitudinal Balance
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Solution Overview
Problem
Cordless power tools, such as chainsaws and pruning chainsaws, lack balance in both longitudinal and lateral directions, leading to increased operator fatigue and difficulty in aligning the chain during vertical cutting movements due to obstructed line of sight.
Innovation Solution
The components of the power tool, including the handle, motor, and battery pack, are arranged at specific angles and positions relative to the guide bar to achieve enhanced lateral and longitudinal balance, with the center of mass positioned at or below the trigger mechanism, improving stability and reducing fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor and battery pack are positioned to provide sufficient power and duration, then the power and duration are improved, but the overall weight of the cordless power tool increases
Solution Approach 1:
The patent repositions components along the longitudinal axis of the tool, placing the motor below the guide bar and battery pack above the guide bar, creating a vertical distribution of mass that balances the tool longitudinally. This dimensional arrangement allows the heavy components to be distributed rather than concentrated, reducing the negative impact of total weight on operator fatigue.
2Stability of the object's composition
If the handle and motor are positioned above and below the guide bar respectively, then the longitudinal balance is improved, but the device complexity increases
Solution Approach 1:
The patent employs asymmetric positioning of components relative to the guide bar, with the handle extending above and the motor positioned below. This asymmetric arrangement creates a balanced center of gravity along the longitudinal axis, improving stability without requiring symmetric placement that would complicate the design.
3Ease of operation
If the components are arranged to achieve enhanced balance, then the ease of operation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent focuses precision requirements on specific critical interfaces: the longitudinal positioning of the motor relative to the guide bar, and the vertical alignment of the battery pack above the guide bar. By concentrating precision requirements at these key locations rather than throughout the entire assembly, the design achieves balance improvement while managing manufacturing complexity.
Data Source
AI summary
According to examples, a power tool may include a chassis and a guide bar mounted to the chassis, the guide bar having a central axis. The power tool may also include a handle attached to the chassis above the central axis of the guide bar and a motor housed within the chassis to drive a chain around the guide bar, in which the motor is positioned beneath the central axis of the guide bar and a central axis of the motor is at a certain angle with respect to the central axis. The handle, the motor, and the battery pack mount may be positioned with respect to the chassis to cause the power tool to substantially be balanced in both lateral and longitudinal directions about a location near the trigger mechanism when the battery pack is mounted to the battery pack mount.