Hand-held Planer Handle Positioning for Reduced Torque
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Solution Overview
Problem
Existing portable power tools, such as hand-held power planers, face challenges in achieving a compact design while maintaining efficient handling and reducing user fatigue due to suboptimal placement of the main handle and center of gravity, leading to increased torque and moment requirements during operation.
Innovation Solution
The design positions the main handle close to the workpiece contact surface with a maximum distance of less than 150 mm perpendicular to the workpiece contact surface, aligns the center of gravity parallel to the workpiece surface, and positions the drive unit mostly above the center of gravity, ensuring a short lever arm and reducing torque support for the user, thereby enhancing handling and reducing fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the main handle is positioned farther from the workpiece contact surface, then the user has better grip and control, but the tool becomes less compact and increases user fatigue
Solution Approach 1:
The main handle is repositioned in the longitudinal dimension (parallel to workpiece surface) rather than extending in the vertical dimension (perpendicular to workpiece surface). This dimensional shift allows the handle to be closer to the workpiece contact surface while still providing adequate grip distance, resolving the contradiction between compactness and ease of operation.
2Volume of moving object
If the main handle is positioned closer to the workpiece contact surface, then the tool becomes more compact, but the user experiences increased torque and moment requirements
Solution Approach 1:
The handle positioning shifts from vertical extension to longitudinal extension, changing the moment arm geometry. This dimensional reconfiguration reduces the perpendicular distance between the handle and workpiece contact surface while maintaining sufficient operational leverage through extended longitudinal placement.
3Stability of the object's composition
If the center of gravity is positioned away from the workpiece surface, then the tool is easier to balance, but the lever arm increases and requires more user support
Solution Approach 1:
The drive unit is strategically positioned to act as a counterweight, balancing the tool's center of gravity. By placing the heavy drive unit closer to the workpiece contact surface, the tool achieves better balance with a shorter lever arm, reducing the moment and torque that the user must support during operation.
Data Source
AI summary
A portable power tool, in particular a hand-held planing machine, includes at least one workpiece contact unit and at least one handle unit. The workpiece contact unit has at least one workpiece contact surface, and the handle unit has at least one main handle. The main handle has at least one maximum distance point that, in a direction extending at least substantially perpendicularly to a workpiece contact surface, has a maximum distance from the at least one workpiece contact surface. The maximum distance is less than 150 mm.