Hand-held Power Tool Positioning Frame Anti-rotation Design
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Solution Overview
Problem
Existing hand-held power tools, such as screwdrivers, face challenges in providing secure and reliable anti-rotation protection for their components within elongated housings, particularly in maintaining the positioning of drive motors, batteries, and control electronics while preventing overheating and cable jamming.
Innovation Solution
A positioning frame with distinct cross-sectional sections for the drive motor and control electronics, along with ventilation recesses and cable holding sections, is integrated into the elongated housing, utilizing snap connections and screw domes for secure assembly and preventing overheating and cable entanglement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positioning frame with uniform cross-section is used in an elongated housing, then the structure is simple to manufacture, but anti-rotation protection for components is insufficient
Solution Approach 1:
The positioning frame employs different cross-sectional shapes at its ends - a first cross-section at the first end and a second cross-section at the second end, where the two cross-sections differ in geometry. This asymmetric design enables effective anti-rotation protection within the elongated housing while maintaining manufacturing feasibility through standard molding techniques.
2Volume of moving object
If control electronics and battery are positioned close together, then space is saved, but thermal management and electrical isolation become problematic
Solution Approach 1:
The positioning frame is divided into distinct regions: a first positioning section for the drive motor and a second positioning section for the control electronics and battery. This segmentation physically separates components with different thermal and electrical requirements, enabling independent thermal management and electrical isolation while efficiently utilizing the available space within the elongated housing.
3Temperature
If ventilation is added to prevent motor overheating, then thermal management improves, but device complexity increases
Solution Approach 1:
The positioning frame serves multiple functions simultaneously: it positions and secures components against rotation, provides structural support, and incorporates ventilation features for thermal management. By integrating these functions into a single component rather than adding separate structures, the design prevents motor overheating while minimizing increases in overall device complexity.
Data Source
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AI summary
In a hand-held power tool (100), in particular a screwdriver, with an elongated housing (110) in which at least one drive motor (140) for rotating a tool holder (120), a battery (150) for mains-independent power supply of the drive motor (140), and associated control electronics (220) are arranged, and with a positioning frame (200) which forms an interior (205, 206) for positioning the drive motor (140), the battery (150) and the associated control electronics (220) in the elongated housing (110), the positioning frame (200) has a first positioning section (208) for positioning the drive motor (140) and a second positioning section (209) for positioning the associated control electronics (220) and the battery (150), wherein the first and second positioning sections (208, 209) have different cross-sections.