Angled Handle Layout for Vertical Hand-Held Power Tools
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Solution Overview
Problem
Hand tools and traditional power tools often require significant effort and are inefficient due to their design limitations, leading to user strain and discomfort, particularly when used in vertical orientations.
Innovation Solution
A hand-held power tool design featuring a handle angle that reduces ulnar deviation, positions the center of mass near the tool head, and provides wrist clearance, with a motor positioned forward to lower the tool's center of mass and include additional handles for stability and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is positioned in a conventional orientation, then the tool structure is simple, but the user experiences ulnar deviation and wrist strain during vertical operation
Solution Approach 1:
The handle is positioned at an acute angle (65-90 degrees) relative to the rotational axis rather than a conventional perpendicular or parallel orientation. This asymmetric angular configuration eliminates ulnar deviation and wrist strain during vertical operation while maintaining structural simplicity
Solution Approach 2:
The acute angle between the handle axis and rotational axis is specifically optimized for the wrist region, providing localized ergonomic improvement without requiring complex modifications to the entire tool structure
2Ease of operation
If the center of mass is positioned at the conventional location, then the tool balance is standard, but the user must exert significant force to hold the tool in vertical orientation
Solution Approach 1:
The center of mass is repositioned forward, near the tool head, creating a counterbalancing effect that reduces the force required by the user to hold the tool in vertical orientation. This forward weight distribution counteracts the natural tendency of the tool to rotate or shift during operation
3Ease of operation
If the battery pack is positioned in the conventional location, then the power supply is stable, but the user's wrist contacts the battery pack causing strain
Solution Approach 1:
The battery pack is repositioned along the longitudinal axis of the tool, moving it away from the wrist region. This dimensional repositioning provides wrist clearance during vertical operation while maintaining stable power supply connection through the battery foot engagement mechanism
4Stability of the object's composition
If the motor is positioned at the conventional location, then the motor assembly is simple, but the tool lacks stability during vertical operation
Solution Approach 1:
The motor is positioned forward, near the tool head, creating a counterbalancing effect that enhances stability during vertical operation. This forward positioning of the heavy motor component counteracts the natural instability and improves control during digging or drilling operations
Data Source
AI summary
Disclosed herein is a hand-held power tool including a motor housing, a motor in the motor housing, an anger coupled to the motor and having a rotational axis, and a first handle coupled to the motor housing and including a grip. In some embodiments, the rotational axis of the anger and an axis of the grip subtend to an acute angle.