Hand-Held Power Tool Adjusting Ring Nesting
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Solution Overview
Problem
Hand-held power tools with L-shaped designs are limited in their ability to be used in tight spaces due to their overall length, which also requires significant holding moments from the operator, and alternative designs with the handle below the adjusting ring compromise accessibility to the adjusting ring for control purposes.
Innovation Solution
The overall length of the hand-held power tool is shortened by incorporating a cavity radially inside the adjusting ring to accommodate the axial rear end of the tool clamping unit, reducing the tool's length and eccentricity, and allowing the front bearing point of the drive shaft to be partially inside the clamping unit, while maintaining existing production tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hand-held power tool is designed with L-shaped configuration and the adjusting ring is situated adjacent to the chuck in the axial direction, then the adjusting ring is easy to operate because the whole ring can be grasped, but the overall length of the mechanical train limits the ability of the hand-held power tool to be used in tight spaces and results in powerful holding moments that must be supported by the operator
Solution Approach 1:
The patent applies nesting by placing the adjusting ring inside a cavity of the chuck body, allowing the adjusting ring to be housed within the existing chuck structure rather than extending externally. This nested arrangement reduces the overall length of the power tool while keeping the adjusting ring accessible for operation.
Solution Approach 2:
The patent repositions the adjusting ring from an external axial position to an internal radial position within the chuck cavity. This dimensional change allows the adjusting ring to be accessed from the radial direction while being housed within the chuck's internal space, effectively reducing the tool's overall length.
2Force
If the handle is situated below the adjusting ring, then the tool weight has a less powerful impact on the holding moment to be exerted by the operator, but there is limited accessibility to the adjusting ring for control purposes
Solution Approach 1:
The adjusting ring is nested within the chuck cavity, positioned such that it remains accessible from the front of the tool while being housed inside the chuck structure. This allows operators to access and adjust the ring even when the handle is positioned below, maintaining ease of operation while optimizing weight distribution.
Solution Approach 2:
The chuck cavity serves as an intermediary space that houses the adjusting ring, allowing the ring to be positioned in a location that optimizes both ergonomics and accessibility. The cavity acts as a mediator between the handle position and the adjusting ring position, enabling effective control despite the handle being below the ring.
3Length of moving object
If the tool clamping unit protrudes into the spindle housing in the axial direction, then the overall length is reduced, but the hand-held power drills described therein are not equipped with an adjusting ring that is situated axially in relation to the chuck
Solution Approach 1:
The adjusting ring is nested within the chuck cavity, which is formed by the tool clamping unit protruding into the spindle housing. This nested arrangement allows the adjusting ring to be positioned axially within the reduced overall length while remaining accessible for operation through the front opening of the cavity.
Solution Approach 2:
The adjusting ring is positioned radially within the chuck cavity rather than extending axially from the chuck. This dimensional change allows the ring to be accessed from the radial direction while being housed within the axially reduced space created by the tool clamping unit protrusion.
Data Source
AI summary
The invention relates to a hand-held power tool with a tool clamping unit and an adjustment ring. The invention provides that the adjustment ring protrudes forwards in an axial direction beyond an axially rear end of the tool clamping unit, at least when the tool clamping unit is completely open. The invention further relates to an adjustment ring for a hand-held power tool.