Hand-Held Power Tool Pivot Handle Ergonomics
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Solution Overview
Problem
Conventional hand-held power tools are uncomfortable and awkward to use when operated at levels significantly different from their ergonomic design, leading to user discomfort, especially during extended periods due to their heavy weight and fixed handling configurations.
Innovation Solution
A hand-held power tool design featuring a pivotally connected housing with a movable hand-grip portion and counterweight distribution, allowing users to adjust the tool's inclination and orientation for improved ergonomics and reduced effort, using a battery as a counterweight and a dual-handle system for enhanced control and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the power tool is designed with a fixed handle configuration for a specific operating level, then the tool structure is simple and manufacturing is easy, but the tool becomes uncomfortable and awkward to use at operating levels different from the design level
Solution Approach 1:
The patent applies the dynamics principle by making the handle configuration adjustable rather than fixed. The first handle can be positioned at different locations along the longitudinal axis of the housing, allowing the tool to adapt to various operating levels (ground level, overhead, intermediate heights). This dynamic repositioning capability resolves the contradiction by providing versatility without requiring multiple fixed-handle tools.
Solution Approach 2:
The handle configuration is segmented into multiple possible positions along the housing's longitudinal axis. The first handle can be selectively positioned at different segments/locations, and the second handle is also configurable. This segmentation allows the tool to be adapted to different operating conditions while maintaining a relatively simple overall structure, as the same handle components can be repositioned rather than requiring entirely different handle assemblies.
2Adaptability or versatility
If the power tool is held at operating levels significantly different from the ergonomic design level, then various applications can be performed, but user discomfort and awkwardness increase significantly
Solution Approach 1:
The patent makes the handle configuration dynamic and adjustable, allowing users to reposition the first handle along the housing to match different operating levels. Whether working at ground level, overhead, or at intermediate heights, users can configure the handles to maintain an ergonomic posture, thereby extending the comfortable operating range without sacrificing user comfort.
3Productivity
If the power tool is operated for extended periods at non-ergonomic levels, then more applications can be completed, but user discomfort becomes unbearable
Solution Approach 1:
By enabling dynamic repositioning of the first handle along the housing's longitudinal axis, the patent allows users to maintain ergonomic postures during extended operation. Whether the application requires ground-level work, overhead trimming, or intermediate heights, the handles can be configured to keep the tool at a comfortable operating level, thereby enabling prolonged productive use without unbearable discomfort.
Data Source
AI summary
A cutting tool includes a working member power coupled to a power drive arrangement held by a housing. The housing includes a front housing portion from which the working member protrudes and a rear housing portion. A first handle includes a first hand-grip portion adapted for a user to hold the power tool at an operative level above the ground level, a second handle adapted for a user to generate a turning moment about the first handle so as to vary inclination of the working member relative to the ground level. The second handle includes a movable hand-grip portion which is attached to the rear housing portion. The rear housing portion is pivotally connected to the front housing portion, and the movable hand-grip portion of the second handle is arranged to pivotally move the rear housing portion relative to the front housing portion.