Auxiliary Handle Axial Stop for Electric Hand Tool
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Solution Overview
Problem
Existing electric hand tools with additional handles are cumbersome to operate one-handed due to the need for complex assembly and potential slippage, as the handle can only be positively secured against rotation in limited positions and may unintentionally detach during use.
Innovation Solution
The receiving means is extended in both axial directions to ensure engagement with the engagement means in multiple positions, featuring an axial stop to prevent accidental detachment and allow easy rotation and securing of the handle, particularly in one-handed operations, through a radial projection and circumferentially extending groove or cam system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the additional handle is designed to be rotatable and fixable in multiple positions, then the versatility and ease of operation are improved, but the risk of unintentional detachment and the complexity of securing it properly increases
Solution Approach 1:
The receiving means is extended in the axial direction to create a stop that prevents detachment. This adds a dimensional constraint (axial direction) to the existing rotational degrees of freedom, allowing the handle to be freely rotatable while preventing unintended removal along the axis.
Solution Approach 2:
The receiving means is divided into functional zones: an engagement region for positive locking in rotated positions and an axial stop region for preventing detachment. This segmentation allows independent optimization of rotational versatility and attachment security.
2Ease of operation
If the clamping collar is loosened to rotate the additional handle, then the handle can be repositioned, but the process becomes cumbersome and time-consuming
Solution Approach 1:
The system transitions from a static locked state to a dynamic rotatable state through partial axial movement. The handle can be dynamically adjusted by moving it axially within the receiving means without requiring complete loosening of the clamping collar, enabling quick repositioning.
Solution Approach 2:
The receiving means is pre-designed with multiple engagement positions and an axial stop, so that the handle can be quickly snapped into different rotational positions without requiring complex adjustment procedures. The structure itself provides the guidance and locking mechanisms.
3Stability of the object's composition
If the additional handle is secured in a form-fitting manner in the second axial assembly position, then rotational stability is improved, but the handle cannot be easily rotated when needed
Solution Approach 1:
The system allows dynamic transition between locked and rotatable states. In the second axial assembly position, the handle is form-fitting secured for stable operation. When adjustment is needed, the handle can be moved axially to the first position where it becomes rotatable, then returned to the second position to lock in the new orientation.
Solution Approach 2:
Rotational adjustment is achieved through axial movement. The handle moves in the axial direction to access the rotatable first position, rotates freely, then returns axially to the locked second position. This converts a rotational problem into an axial movement problem, simplifying the adjustment mechanism.
Data Source
Figure 1~4
AI summary
The device (1) has an auxiliary hand grip (5) suspensible in an axial direction (9) on a housing body (3). A receiving unit is extended in a circumferential direction and in the axial direction. An engagement unit is in engagement with the receiving unit in an axial mounting position of the hand grip. The receiving unit forms an axial stop in order to prevent the hand grip from being removed accidentally from the body when the hand grip is moved into the axial mounting position from another axial mounting position, so as to twist the hand grip.