Auxiliary Handle Insulation for Handheld Power Tools
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Solution Overview
Problem
Handheld power tools, such as cordless screwdrivers, lack a secure and safe attachment mechanism for auxiliary handles, which can lead to electrical hazards and reduced user comfort due to the risk of electric shock when drilling into power lines.
Innovation Solution
A handheld power tool design featuring a metal housing with a receiving area for an auxiliary handle, a non-rotatable connection to the motor housing, and an insulating unit that electrically isolates the output spindle and metal housing, providing a stable and safe attachment while minimizing the risk of electric shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an auxiliary handle is attached to the power tool, then user comfort and control are improved, but the risk of electric shock increases due to potential contact with live wires
Solution Approach 1:
The patent introduces an insulating unit as an intermediary component between the conductive metal housing and the auxiliary handle. This insulating unit prevents direct electrical contact between the user's hand gripping the auxiliary handle and the metal housing that may be at electrical potential, thereby eliminating the electric shock risk while preserving the ergonomic benefits of the auxiliary handle
2Stability of the object's composition
If a secure attachment mechanism for the auxiliary handle is implemented, then mounting stability is improved, but device complexity increases
Solution Approach 1:
The patent combines the insulating unit with the auxiliary handle attachment mechanism into an integrated assembly. The insulating unit is positioned to simultaneously provide electrical insulation and serve as part of the mounting structure for the auxiliary handle, eliminating the need for separate insulation components and reducing overall device complexity
Solution Approach 2:
The metal housing is divided into functional zones: a conductive metal housing portion for structural strength and a separate insulating unit portion for electrical isolation. This segmentation allows each component to be optimized for its specific function while simplifying the overall attachment mechanism design
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures a secure and safe attachment of the auxiliary handle, enhancing user safety and comfort by preventing electrical contact and reducing the risk of electric shock during use.
Implementation Method 1
an insulating unit (24) which, in an assembled state, electrically insulates the output spindle (14) and the metal housing (16) from each other
Data Source
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AI summary
A hand-held power tool, in particular a cordless screwdriver, is proposed, comprising a motor housing (12), an output spindle (14), at least one metal housing (16) which has a receiving area (18) for attaching an auxiliary handle (20) and a connection area (22) formed integrally with the receiving area (18) for a backlash-free rotationally fixed connection with the motor housing (12), and an insulating unit (24) which, in an assembled state, electrically insulates the output spindle (14) and the metal housing (16) from each other.