Axial Locking Mechanism for Handheld Power Tools
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Solution Overview
Problem
Existing locking devices for handheld power tools are not designed for simple and intuitive operation, often leading to accidental activation of the locking mechanism during tool use, which can impede the functionality of the power tool.
Innovation Solution
A spindle lock mechanism with an activating element that moves axially along the shaft axis, distinct from the on/off switch activation direction, ensuring secure and comfortable operation by preventing accidental locking state activation during tool operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the activating element is activated in the same direction as the on/off switch (radial direction), then the operation is simplified, but accidental activation of the locking mechanism occurs during tool use
Solution Approach 1:
The patent changes the activation direction of the locking mechanism from the radial direction (same as on/off switch) to the axial direction (parallel to shaft axis). This dimensional change allows the activating element to be distinguished from the on/off switch, preventing accidental activation while maintaining ease of operation through intuitive axial pressing motion
2Volume of moving object
If the activating element is positioned close to the shaft for compact design, then the device size is reduced, but the risk of accidental activation increases
Solution Approach 1:
By positioning the activating element to move in the axial direction along the shaft axis, the patent achieves compact radial positioning while preventing accidental activation through directional distinction. The activating element can be located near the shaft for compactness, but its axial movement path differentiates it from radial on/off switch operation
3Strength
If the locking element engages firmly with the shaft for secure locking, then the shaft twisting is prevented, but the activation force required increases
Solution Approach 1:
The patent employs a spring element that provides dynamic, elastic engagement between the locking element and shaft. The spring allows the locking element to engage firmly for secure locking while accommodating variations in activation force, reducing the required activation force through elastic deformation rather than rigid mechanical engagement
Data Source
AI summary
The disclosure relates to a locking device for an in particular rotary-drive handheld power tool, in particular a rotary power tool, with a shaft for driving an accessory device which can be connected to the handheld power tool, with a locking element for locking the shaft, and with an activating element for activating the locking device. The activating element is mounted so that it can move in an axial direction along the shaft, in particular a shaft axis of the shaft.