Accelerometer-Based Anti-Kickback Control for Power Tools
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Solution Overview
Problem
Handheld power tools with self-locking functions can continue running after use, posing safety hazards, and kickback events can cause injury due to sudden torque transmission.
Innovation Solution
An anti-kickback module with an accelerometer and processor to detect acceleration changes, determining a kickback state and instructing a power controller to cease operation or actively decelerate the motor, using a braking profile or active braking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a self-locking function is implemented to allow continuous operation, then productivity is improved, but safety deteriorates due to potential harm from uncontrolled continuous running
Solution Approach 1:
The system continuously monitors acceleration data from the accelerometer and uses this feedback to detect kickback events. When abnormal acceleration patterns indicating kickback are detected, the system automatically triggers braking to stop the tool, thus maintaining productivity while eliminating safety hazards from uncontrolled operation.
Solution Approach 2:
The patent replaces manual control mechanisms with an automated electronic control system that uses sensors (accelerometer) and processors to detect kickback events and trigger braking. This substitution allows the tool to automatically respond to kickback conditions without requiring user intervention, resolving the contradiction between continuous operation capability and safety.
2Device complexity
If manual control is used to stop the tool, then device complexity is reduced, but response time deteriorates during kickback events causing potential injury
Solution Approach 1:
The system performs preliminary action by continuously monitoring acceleration data and pre-positioning the braking mechanism for immediate activation. When kickback is detected through acceleration analysis, the braking system is already ready to engage, eliminating response delay and allowing the tool to stop almost immediately, thus reducing loss of time without significantly increasing device complexity.
3Object-affected harmful factors
If active braking is implemented to quickly stop the motor, then safety is improved, but device complexity increases due to additional braking mechanisms
Solution Approach 1:
The processor acts as an intermediary between the accelerometer and the braking mechanism. It analyzes acceleration data to detect kickback events and triggers the braking system accordingly. This intermediary approach allows active braking to be implemented in a controlled manner, improving safety while managing device complexity through intelligent control rather than purely mechanical complexity.
4Productivity
If self-locking function is activated to maintain operation, then productivity is improved, but harmful factors worsen due to potential harm when user sets down the tool
Solution Approach 1:
The system uses feedback from the accelerometer to continuously monitor tool status and detect when the tool is set down or dropped. This feedback mechanism allows the system to maintain self-locking operation for productivity while automatically detecting abnormal conditions and triggering appropriate responses to prevent harm from uncontrolled operation.
Solution Approach 2:
The patent replaces manual monitoring and control with an automated sensor-based system that detects when the tool is improperly positioned or set down. This substitution enables the tool to automatically respond to such conditions by triggering braking or other safety measures, maintaining productivity through self-locking while eliminating the harmful effects of uncontrolled operation.
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
Reduces the risk of injury by quickly stopping the power tool during kickback events and preventing harm from continuous operation after use.
Implementation Method 1
an accelerometer arranged to detect components of acceleration of the power tool
Data Source
Figure 1~2
Figure 3A~3B
Figure 4
AI summary
An anti-kickback module for a power tool comprises an accelerometer arranged to detect components of acceleration of the power tool, a power controller configured to control an operational state of the power tool, and a processor configured to determine a kickback state of the power tool based on a change in at least one component of acceleration of the power tool, and instruct the power controller to cease operation of the power tool in response to determining the kickback state.