Power Tool Material Sensing for Flesh-Safe Motor Response
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Solution Overview
Problem
Power tools lack the ability to automatically detect and respond to objects in their operating path, particularly to prevent accidents by identifying and reacting to the presence of flesh or specific materials that could be damaged by operation.
Innovation Solution
Integration of an object detection sensor system within power tools that generates signals indicative of materials in the operating path, allowing a controller to determine the presence and type of objects and adjust the tool's operation accordingly, such as interrupting power to the motor when flesh is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power tools operate without object detection, then productivity and ease of operation are maintained, but safety and reliability deteriorate due to inability to detect flesh or damaging materials
Solution Approach 1:
The sensor system is designed to detect multiple types of objects (flesh, wood, metal, plastic) using a single multi-functional sensor assembly, allowing the power tool to adapt to different operating conditions without requiring multiple specialized sensors
Solution Approach 2:
The controller receives continuous feedback from the sensor about objects in the operating path and automatically adjusts motor operation or interrupts power when dangerous conditions are detected, creating a closed-loop safety system that responds in real-time
2Reliability
If object detection sensors are integrated, then safety and reliability improve, but device complexity and manufacturing cost increase
Solution Approach 1:
A single sensor assembly performs multiple detection functions (flesh detection, material identification, obstacle detection) rather than requiring separate specialized sensors for each function, simplifying the manufacturing process while maintaining comprehensive safety coverage
Solution Approach 2:
The sensor system automatically identifies materials and adjusts operating parameters without requiring manual configuration or calibration by the manufacturer, enabling self-configuration that reduces manufacturing complexity
3Reliability
If the power tool continuously monitors for objects, then safety improves, but energy consumption increases
Solution Approach 1:
The sensor system performs periodic object detection at strategically chosen moments (before motor activation, during idle periods, and at transition points) rather than continuous monitoring, maintaining safety while significantly reducing energy consumption of the sensor and controller
Data Source
AI summary
A power tool and methods are provided for detecting objects (e.g., flesh or other materials) in the operating path of a power tool's output component (e.g., saw blade or drill bit). An object detection sensor in the power tool generates an output signal indicative of a type of material detected in the operating path of the power tool. A power tool controller receives the object detection sensor output and determines when a material in the operating path of the power tool changes. The controller changes operation of a motor of the power tool (e.g., increasing or decreasing speed or stopping the motor) in response to the detected material change. The object detection sensor may include, for example, an RF sensor, a capacitive sensor, a camera, a conductivity probe, or an ultrasound probe.