Protective Garment With Blade-Triggered Chainsaw Shutdown
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Solution Overview
Problem
Existing protective garments for electric power tools, such as chainsaws, fail to prevent the chain from cutting through multiple layers due to increased torque when the tool slows down, posing a hazard to the operator.
Innovation Solution
A protective garment with metal fibers that entangle with the blade and trigger a sensing device to send a signal to disable the tool's blade movement, incorporating wireless or wired communication for immediate shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective garments use multiple layers of fabric to protect against moving blades, then protection capability is improved, but the garment may be cut through when the tool slows down and torque increases
Solution Approach 1:
The patent incorporates a sensing device that detects when the blade contacts the garment and automatically sends a signal to disable the tool's motor. This feedback mechanism allows the system to respond to the harmful condition (blade contact) by eliminating the driving force, preventing the blade from cutting through the garment layers despite increased torque.
Solution Approach 2:
The patent replaces reliance on purely mechanical resistance (multiple fabric layers) with an electronic control system. The sensing device and signal generator create an electrical control mechanism that disables the motor, substituting the mechanical protection approach with an active electronic safety system that prevents the harmful effect at its source.
2Device complexity
If protective garments rely solely on physical barrier layers, then device complexity is reduced, but safety effectiveness decreases when tool torque increases
Solution Approach 1:
The patent merges the protective garment with an electronic safety system by integrating the sensing device and signal generator into the garment structure. This combination allows the relatively simple physical garment to gain enhanced safety capabilities through the integrated electronic components, achieving both simplicity and effectiveness.
Solution Approach 2:
The protective garment becomes self-activating through the sensing device that automatically detects blade contact and triggers the signal generator to disable the tool. This self-service mechanism eliminates the need for external monitoring or manual intervention, maintaining simplicity while dramatically improving safety effectiveness.
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
Prevents further cutting by the chainsaw chain by disabling the tool's power supply upon contact, enhancing safety for the operator.
Implementation Method 1
At least one layer of the plurality of layers is formed from a plurality of fibers adapted to entangle with the moving blade upon contact between the moving blade and the fabric
Implementation Method 2
The garment includes a garment sensing device having a sensor configured to detect when one or more metal fibers are cut
Data Source
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AI summary
Protective garments (100, 200) are provided. A protective garment includes a protective garment fabric (110, 210). The fabric is formed from a plurality of layers. At least one layer of the plurality of layers is formed from a plurality of fibers adapted to entangle with a moving blade of a tool (10) upon contact between the moving blade and the fabric. At least one layer of the fabric includes metal fibers (112, 212). The garment includes a garment sensing device (120, 220) including a sensor (118, 218) configured to detect when one or more metal fibers are cut, and a signal generator (122) configured to send a signal to the tool to disable movement of the moving blade.