Hand-Guided Power Tool Handle with Angled Thumb Support
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Solution Overview
Problem
Existing hand-guided power tools, such as trimmers, require ergonomic and force-saving methods for introducing guiding forces, as they necessitate movements like pushing and pressing, which are not efficiently managed by conventional handles.
Innovation Solution
The handle design features a thumb support surface angled between 20° and 70° relative to the handle's longitudinal axis, allowing for ergonomic thumb positioning and force introduction, combined with a rounded portion for continuous hand support and strategically positioned operating elements for easy access and minimal disturbance during various hand positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional handles are used, then the structure is simple, but the ergonomic performance and force application efficiency deteriorate
Solution Approach 1:
The patent applies local quality by creating a thumb support surface with a specific angular range (20°-70°) at a particular location on the handle's inner side. This localized geometric modification provides ergonomic benefits for thumb positioning and force application without requiring complete redesign of the entire handle structure, thus improving ease of operation while maintaining relatively simple overall device complexity.
2Force
If the thumb support surface is angled between 20° and 70°, then the force application efficiency improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies an angular parameter range (20°-70°) for the thumb support surface rather than a single precise value. This parameter range approach allows manufacturers to achieve acceptable force application efficiency within a tolerable angular variation, balancing improved force application with practical manufacturing precision capabilities.
3Ease of operation
If operating elements are strategically positioned, then the ease of operation improves, but the device complexity increases
Solution Approach 1:
The patent positions operating elements on the handle in advance during design, specifically arranging them to be easily accessible from the ergonomic hand position supported by the angled thumb surface. This preliminary strategic positioning ensures that users can naturally access controls during operation without requiring complex adjustments or movements, improving ease of operation while keeping the overall handle configuration relatively simple.
Data Source
AI summary
A power tool handle has a shaft with a fastening end securing the handle on the power tool and with a free end. The handle has an outer side for supporting a palm of a hand. First and second operating elements are pivotably supported at the shaft about first and second pivot axes, respectively. The first operating element controls a power tool drive motor. In non-actuated position, the second operating element prevents a control action of the first operating element and has an actuating section projecting from the shaft and having a first and a second end. The first end is closer to the fastening end of the shaft than the second end. The second end is closer to the free end of the shaft. The second pivot axis is closer to the first end than to the second end. A trimmer is provided with such a handle.