Electric Tool Handle Detecting Unit for Safety Control
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Solution Overview
Problem
Existing electric tool handles lack the ability to detect and respond to various physical values, leading to unsafe handling practices, particularly in high-torque applications where sudden torque spikes can cause the tool to be thrown from the operator's hands, resulting in injuries and damage.
Innovation Solution
The handle incorporates a detecting unit that senses physical values such as the presence of auxiliary handles, grasping forces, and torque, generating electrical signals to control the electric tool's operation, allowing for safer two-handed operation and automatic adjustments to prevent accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If maximum power output is supplied to enable high-torque operation, then productivity is improved, but safety deteriorates due to risk of tool being thrown from operator's hands during torque spikes
Solution Approach 1:
The patent implements a feedback mechanism where detecting units continuously monitor physical values (grasping force, torque, acceleration) and transmit signals to a control unit. The control unit adjusts power output in real-time based on detected conditions, automatically reducing power when unsafe conditions are detected (single-handed operation, abnormal acceleration) while maintaining maximum power during safe two-handed operation, thus resolving the contradiction between productivity and safety
Solution Approach 2:
The patent applies preliminary action by detecting operating conditions before dangerous situations occur. The detecting units monitor grasping force and tool acceleration continuously, and the control unit is prepared to immediately reduce power output when predefined safety thresholds are approached, preventing tool throw-before the actual dangerous event happens, thereby maintaining both high productivity and safety
2Reliability
If auxiliary handles are installed to enable two-handed operation for safety, then safety is improved, but device complexity increases
Solution Approach 1:
The patent makes the main handle multi-functional by integrating detecting units directly into it. The main handle now serves both as the primary gripping element and as a sensor platform that detects whether an auxiliary handle is present and whether the operator is using one or two hands. This eliminates the need for separate sensing mechanisms on auxiliary handles, reducing overall device complexity while maintaining safety through intelligent detection and control
3Reliability
If detecting units and control systems are added to monitor operating conditions, then safety is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into integrated components: the detecting units are combined with the handle structure, the signal transmission system is integrated with the existing electrical connections between handle and tool body, and the control unit is merged with the tool's existing control system. This consolidation approach minimizes additional complexity while achieving comprehensive safety monitoring through detection of grasping force, auxiliary handle presence, and abnormal acceleration
Data Source
AI summary
A handle for an electric hand tool, which in use, is detachably connected to the hand tool as an auxiliary handle (2), includes at least one detection device (6), which communicates with at least one regulating and/or control element in the electric hand tool through a contactless signal transmission device.