Electronic Safety Device for Portable Heat Engine Tools
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Solution Overview
Problem
Existing safety devices for portable heat engine tools, such as chainsaws, rely on mechanical means that are inefficient, prone to wear, and offer limited sensitivity and plane coverage, leading to slow response times and potential user injury during violent rebounds.
Innovation Solution
A safety device utilizing an independent electrical and/or electronic control system that processes acceleration data from accelerometers to directly control the engine's braking or ignition, allowing for fast, adjustable, and multi-planar response without moving parts, reducing wear and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mechanical means are used for safety devices, then the device structure is simple, but the response time is slow and the sensitivity is limited
Solution Approach 1:
The patent replaces the traditional mechanical safety device with an electronic control system comprising accelerometers, electronic control units, and electronic braking/ignition control. This substitution eliminates mechanical linkages and moving parts, enabling instantaneous detection and response to tool movement through electronic signal processing, thereby dramatically reducing response time while maintaining system simplicity through integrated electronic components.
2Ease of manufacture
If mechanical means are used for safety devices, then the device is easier to manufacture, but the device is prone to wear and has limited reliability
Solution Approach 1:
The patent eliminates mechanical components that are subject to wear by using solid-state accelerometers and electronic control circuits. These electronic components have no moving parts, eliminating friction, wear, and mechanical failure modes. The system achieves enhanced reliability through electronic sensing and control while remaining manufacturable using standard electronic component assembly processes.
3Device complexity
If mechanical means are used for safety devices, then the device is simpler, but the sensitivity and plane coverage are limited
Solution Approach 1:
The patent employs electronic accelerometers that can detect acceleration vectors with high precision in multiple planes (X, Y, and Z axes). These electronic sensors provide superior measurement sensitivity compared to mechanical mechanisms, enabling detection of subtle tool movements and vibrations. The electronic control unit processes signals from multiple accelerometers to determine tool orientation and movement in three-dimensional space, achieving comprehensive plane coverage without significantly increasing device complexity.
4Weight of moving object
If mechanical means are used for safety devices, then the device is lighter, but the inertia threshold is very high
Solution Approach 1:
The patent uses electronic accelerometers with very low mass to detect tool movement, eliminating the need for heavy mechanical trigger mechanisms. The electronic sensing system can detect acceleration events with thresholds as low as 2000 m/s², providing highly sensitive detection without adding significant weight. The electronic control unit processes accelerometer signals to determine when safety thresholds are exceeded, enabling lightweight construction with high trigger sensitivity.
5Device complexity
If mechanical means are used for safety devices, then the device has fewer components, but the device can cause user injury during violent rebound
Solution Approach 1:
The patent replaces mechanical braking mechanisms that can cause harmful shocks to the user with electronic control of the engine's ignition and fuel injection systems. When a safety event is detected, the electronic control unit instantly cuts off ignition and fuel supply, stopping the engine without mechanical impact. This electronic approach eliminates the harmful rebound effects associated with mechanical braking while maintaining simple system architecture through integrated electronic control.
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 enables instantaneous automatic stopping of tools during violent movements, enhancing safety by reducing response time, eliminating wear, and allowing adjustable sensitivity, while being more economical and lightweight compared to mechanical systems.
Implementation Method 1
at least one accelerometer (5) capable of measuring an acceleration on at least one plane or axis
Data Source
Figure 1A~1B
Figure 1A'~1B'
Figure 2~3
AI summary
Safety device for portable thermal engine tool allowing the near-instantaneous stopping of said tool's operation due to sudden and unforeseen violent movements, said device comprising at least one electronic accelerometer (5) allowing measurement of acceleration along at least one plane or axis (X, Y, Z), the output, or each output, of this accelerometer (5) being connected to an electrical and/or electronic control means (7), said electrical and/or electronic control means consisting of an electrical and/or electronic management board (7), this board and the accelerometer being supplied with electrical voltage by an electrical current generator (9) known in itself driven by the thermal engine, this electrical or electronic management board being configured to process the analog or digital electrical information from the accelerometer and to activate a means ensuring the near-instantaneous stopping of said thermal engine.