Touch-Sensing Power Tool Control for Safe Motor Activation
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Solution Overview
Problem
Existing power tools lack effective safety mechanisms to prevent accidental operation when a user's body part is not properly positioned in relation to the tool's operation area.
Innovation Solution
The power tool design incorporates a sensing system with sensors integrated into the handle and adjacent to the tool output, which communicate with a controller to ensure the motor only operates when the user is grasping the handle and not in proximity to the tool output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch sensors are integrated into the handle and tool output area, then user safety is improved by preventing accidental operation, but device complexity increases due to additional sensors and control circuitry
Solution Approach 1:
The touch sensors detect user presence and position before the motor operation is initiated. The controller evaluates sensor signals in advance to determine whether to permit or prohibit motor operation, preventing accidental activation before the user is properly positioned.
Solution Approach 2:
Touch sensors serve as intermediary detection elements between the user and the motor control system. The sensors detect body part proximity or contact and transmit signals to the controller, which then mediates the motor operation based on safety conditions.
2Reliability
If the motor is controlled to require proper user positioning, then safety is improved by reducing accident risk, but ease of operation deteriorates due to additional positioning requirements
Solution Approach 1:
The system automatically monitors user positioning through touch sensors and autonomously controls motor operation based on detected conditions. The user simply needs to grasp the handle naturally; the system self-regulates operation permission without requiring additional user actions or complex positioning procedures.
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
This solution enhances user safety by preventing motor operation unless the user is correctly positioned, thereby reducing the risk of accidents and injuries.
Implementation Method 1
a first touch sensor disposed in the handle, a second touch sensor disposed adjacent the tool output
Data Source
AI summary
A power tool includes a housing, a handle coupled to the housing and configured to be grasped by a user during operation, a motor supported by the housing, a table, a mounting arm, and a controller. The table includes a sensing portion. The sensing portion includes a sensor. The sensing portion is configured to detect a body part of the user touching the table. The mounting arm supports the housing. The mounting arm is pivotably connected to the table and the housing. The controller is connected to the motor and the sensor. The controller is configured to receive a signal from the sensor related to whether the body part of the user is touching the table, and control operation of the motor in response to the sensing portion detecting that the body part of the user is touching the table.