Electric Hand Tool Quick-Release Cable Coupling
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Solution Overview
Problem
Existing electric hand tools with detachable energy storage sections and connection cables lack adequate safety measures to prevent accidents when the tool is dropped, potentially leading to operator tripping or falling due to cable tension, and suffer from voltage drops that hinder performance during full-load operations.
Innovation Solution
An electric hand tool design featuring a non-positive quick coupling in the connection cable that disconnects at specific force and moment thresholds to prevent accidental detachment during normal use, combined with an exoskeleton carrying device and a connection cable with optimized electrical properties to minimize voltage drops, ensuring safe operation and balance during falls and full-load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the connecting cable is made detachable with a quick-release coupling, then the ease of operation is improved, but the reliability deteriorates due to risk of accidental detachment during normal use
Solution Approach 1:
The quick-release coupling is designed with a predefined disconnection force threshold that must be exceeded for detachment to occur. This preliminary force requirement ensures that normal operational forces (handling, vibration, accidental bumps) cannot accidentally disconnect the cable, while still allowing intentional disconnection when needed. The coupling mechanism is pre-configured with spring elements and engagement features that maintain secure connection under normal conditions.
2Reliability
If the quick-release coupling is designed to disconnect at high force thresholds, then the reliability is improved, but the harmful factors worsen as the operator may still be pulled if the tool is dropped from significant height
Solution Approach 1:
The quick-release coupling incorporates a force threshold mechanism that acts as a safety cushion. By setting the disconnection force threshold to correspond to forces generated by drops from maximum safe working heights (e.g., 25 cm), the system provides protective cushioning against normal operational variations while automatically disconnecting before forces from dangerous falls can injure the operator. This preliminary force threshold design cushions the operator from harmful effects of accidental drops.
3Adaptability or versatility
If the connecting cable is made longer to allow external energy storage carrying, then the adaptability is improved, but the voltage drop increases reducing performance during full-load operations
Solution Approach 1:
The connecting cable is designed with optimized electrical parameters including increased conductor cross-sectional area, improved conductivity material selection, and minimized resistance through careful wire gauge selection. These parameter changes allow the cable to maintain low voltage drop characteristics even at extended lengths required for external energy storage carrying. The cable's electrical parameters are specifically tuned to balance flexibility/adaptability with performance requirements under full-load conditions.
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 enhances work safety by preventing operator tripping or falling from dropped tools and ensures problem-free operation with reduced voltage drops, allowing for longer, safe use of electric hand tools even when the energy storage is carried externally.
Implementation Method 1
the quick-release coupling opens and disconnects the connecting cable at the disconnect point when a force greater than a predefined force acts on the quick-release coupling in the disconnection direction
Implementation Method 2
The quick-release coupling can be designed, for example, as a magnetic connector or a mechanical quick-release coupling
Data Source
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AI summary
The invention relates to an electric hand tool with an electric drive, wherein the electric drive is arranged in a handle section with at least one handle, with an energy storage section for at least partial electrical energy supply of the electric drive, with a carrying device on which the energy storage section is arranged, so that the energy storage section can be carried on the body of an operator by means of the carrying device, and with a connecting cable between the handle section and the energy storage section, wherein the connecting cable has a detachable disconnect point, in which the disconnect point is designed as a friction-fit quick-release coupling, so that the quick-release coupling opens and disconnects the connecting cable at the disconnect point when a force greater than a predefined force acts on the quick-release coupling in the disconnection direction of the quick-release coupling.