Power Tool Hand Detection and Auto-Braking Near Exposed Blades
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Solution Overview
Problem
Power tools pose a significant risk of injury to users due to the potential for hands or fingers to come into contact with moving components, despite the use of guards, as a portion of the saw blade or drill bit remains exposed, leading to potential severe injuries.
Innovation Solution
A safety system that includes a sensor assembly and controller to monitor a predetermined danger zone adjacent to the moving component of the power tool, using wearable components with infrared reflective material to detect the presence of the user's hand and automatically shut down or stop the power tool's movement if the hand enters the danger zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guards are used to cover portions of the saw blade, then user safety is improved, but a portion of the saw blade remains exposed creating ongoing risk
Solution Approach 1:
The patent replaces mechanical guards with an optical detection system consisting of sensors, controllers, and algorithms that detect hand presence and automatically stop the blade, eliminating the need for physical barriers while maintaining safety
Solution Approach 2:
The system enables the power tool to automatically protect itself by detecting dangerous conditions and self-stopping the blade through integrated sensors and control circuits, without requiring external intervention
2Reliability
If automatic shutdown systems are implemented, then injury severity is reduced, but device complexity increases
Solution Approach 1:
The safety system is divided into separate functional modules: sensor assembly for detection, controller for processing, algorithms for analysis, and braking system for execution, allowing independent optimization and maintenance of each component
Solution Approach 2:
The patent introduces a wearable component with infrared reflective material as an intermediary that enhances hand detection capability, allowing the sensor system to more reliably distinguish hands from other objects in the danger zone
3Measurement precision
If multiple sensors are used to monitor the danger zone, then detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The sensor assembly is designed to perform multiple functions: detecting hands, determining proximity to the danger zone, and providing data for collision detection algorithms, eliminating the need for separate specialized sensors for each function
Solution Approach 2:
The system combines different sensor types (including infrared and visible light sensors) with complementary detection capabilities to create a composite sensing system that achieves high accuracy while leveraging the strengths of each sensor type
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
Effectively inhibits or minimizes the severity of injuries by automatically shutting down the power tool and stopping its moving components when the user's hand is detected within the danger zone, enhancing user safety during operation.
Implementation Method 1
The wearable component includes infrared only reflective material
Data Source
AI summary
A safety system, for use with a power tool, includes a sensor assembly and a controller. The power tool includes a base and a moving component that is movable relative to the base. The sensor assembly monitors a predetermined danger zone that is adjacent to the moving component of the power tool. The sensor assembly is configured to generate data relating to the predetermined danger zone. The controller receives the data from the sensor assembly and analyzes the data from the sensor assembly to determine if at least a portion of a hand of the user is present within the predetermined danger zone. The safety system can further include a wearable component including infrared only reflective material that is coupled to the hand of the user. The controller analyzes the data from the sensor assembly to determine if the wearable component is present within the predetermined danger zone.