Auxiliary Handle Axial Securing Mechanism
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Solution Overview
Problem
Existing auxiliary handle devices for hand-held power tools lack effective securing mechanisms, particularly in axial and circumferential directions, leading to potential slippage during tool operation and increased assembly complexity and costs.
Innovation Solution
The proposed auxiliary handle device incorporates a fastening unit with rib-shaped and groove-shaped elements that provide a positive connection in both axial and circumferential directions, utilizing a two-part receiving unit and distinct fastening means to ensure secure attachment to the hand-held power tool, reducing slippage and assembly efforts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing auxiliary handle devices use simple fastening mechanisms, then assembly is easier and costs are lower, but axial and circumferential securing is insufficient leading to slippage during operation
Solution Approach 1:
The fastening unit is divided into two independent fastening means: one for axial direction securing and another for circumferential direction securing. This segmentation allows each fastening element to be optimized for its specific directional function, achieving reliable multi-directional securing without requiring a complex integrated mechanism
Solution Approach 2:
The rib-shaped fastening element is integrated into the receiving area of the auxiliary handle, and the groove-shaped recess is formed on the spindle neck of the power tool. These nested geometric features interlock to provide form-fitting connection in both axial and circumferential directions, achieving robust securing through simple geometric nesting rather than complex mechanical fasteners
2Reliability
If robust fastening means with multiple components are used, then axial and circumferential securing is improved, but assembly effort and installation space increase
Solution Approach 1:
The rib-shaped fastening element is designed as an integrated component of the auxiliary handle's receiving area, and the groove-shaped recess is formed directly on the spindle neck. This merging of fastening features into existing structural elements eliminates the need for separate fastening components, reducing assembly effort while maintaining robust attachment security
Solution Approach 2:
The form-fitting connection between the rib-shaped fastening element and groove-shaped recess provides automatic alignment and securing when the auxiliary handle is attached to the power tool. The geometric interlocking features guide the assembly process and secure the connection without requiring additional fastening operations or tools
Data Source
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AI summary
The invention is based on an auxiliary handle device, in particular for hand-held power tools (12), comprising a fastening unit (14) which comprises at least one fastening means (24, 26). It is proposed that the fastening means (24, 26) is provided in an axial direction (28) of a fastening axis in order to achieve a positive connection.