Add-on Handle Fastening for Hand-held Power Tools
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Solution Overview
Problem
Hand-held power tools lack a design that allows for a compact, easily attachable, and safely insulated add-on handle that can be securely fastened without tools, while ensuring electrical safety during operations like drilling into power lines.
Innovation Solution
The design incorporates a clutch setting ring, a chuck with clamping jaws, and a handle fastening means that are situated partly in a plane perpendicular to the rotation axis, allowing for a short overall length and secure attachment of the add-on handle, with an annular clamping section and insulation unit to prevent electrical shock, using electrically conductive materials and insulating components for safety and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an add-on handle is added to a hand-held power tool, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The handle system is divided into a main handle and a separate add-on handle that can be independently attached or removed. The add-on handle includes its own fastening means (screw connection) that interfaces with the main handle, allowing the operator to customize the tool for different tasks without permanently modifying the tool structure.
Solution Approach 2:
The add-on handle is designed with universal applicability to enhance the functionality of the power tool for multiple operations. The standardized fastening interface allows the same add-on handle to be used with different tool bodies, and the handle itself can provide additional gripping surfaces or operational advantages for various drilling, driving, or machining tasks.
2Ease of operation
If the add-on handle is made easily attachable without tools, then the ease of operation is improved, but the reliability of the connection deteriorates
Solution Approach 1:
A threaded fastening interface acts as an intermediary mechanism between the add-on handle and the main handle. This screw connection requires only a simple tightening motion and can be performed with the tool's own components or a basic screwdriver, providing a reliable mechanical connection without requiring specialized tools or complex assembly procedures.
3Volume of moving object
If the add-on handle is positioned to enclose the clamping jaws, then the compactness is improved, but the accessibility for tool attachment deteriorates
Solution Approach 1:
The add-on handle is designed to be dynamically positionable around the chuck assembly. The handle can be rotated or adjusted to different angular positions along the chuck, allowing the operator to optimize the grip position for comfort and control while maintaining a compact overall configuration. This dynamic positioning capability ensures that the handle does not permanently obstruct access to the chuck for tool changes.
Data Source
AI summary
A system includes: an add-on handle; and a hand-held power tool which includes a clutch setting ring, a chuck with clamping jaws and a handle fastening arrangement which is situated axially between a section of the chuck and the clutch setting ring. In at least one operating state the add-on handle fastened to the handle fastening arrangement and the clamping jaws of the chuck are situated in at least one plane which is oriented perpendicularly to a rotation axis of the chuck.