Power Tool Torque Control via Auxiliary Handle Sensor
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Solution Overview
Problem
Power tools face limitations in torque output due to safety regulations, which restrict maximum torque to prevent user injury, but providing an auxiliary handle can enhance performance and torque delivery, necessitating a solution to vary torque output based on handle usage.
Innovation Solution
A power tool design that includes a drive mechanism, spindle, and an auxiliary handle with a sensor and controller to adjust torque output based on whether the auxiliary handle is coupled and being used, allowing for higher torque when engaged and lower torque when not, thereby adhering to safety regulations while offering operational flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an auxiliary handle is provided to enable two-handed operation, then the power tool can deliver greater torque to workpieces, but safety regulations limit the maximum torque to prevent user injury
Solution Approach 1:
The power tool dynamically adjusts its torque output based on whether the auxiliary handle is attached. The controller modifies the drive mechanism's torque supply in real-time: limiting torque when the handle is absent (safety mode) and allowing higher torque when the handle is present (performance mode). This dynamic adaptation resolves the contradiction by making the system's safety-performance characteristics variable rather than fixed.
Solution Approach 2:
The system changes the torque parameter based on the auxiliary handle's presence. The controller adjusts the maximum torque output parameter from a lower safe value to a higher performance value depending on whether the auxiliary handle is attached. This parameter change allows the same physical system to operate under different safety-performance constraints without physical modification.
2Power
If the drive mechanism is configured to supply higher maximum torque, then greater performance is achieved, but safety regulations require torque limitation to prevent user injury
Solution Approach 1:
The drive mechanism operates dynamically with different torque limits based on auxiliary handle presence. The controller adjusts the maximum torque supply in real-time, ensuring safety compliance when the handle is absent while enabling higher performance when the handle is present. This dynamic control allows the system to meet both safety requirements and performance goals without contradiction.
Solution Approach 2:
The maximum torque parameter is changed based on operational conditions. The controller modifies the drive mechanism's torque output parameter from a limited safe value to an unlimited performance value depending on whether the auxiliary handle is attached, allowing the system to comply with safety regulations while maintaining the capability for high-torque operation when appropriate.
3Adaptability or versatility
If the power tool provides variable torque control based on auxiliary handle usage, then operational flexibility is enhanced, but device complexity increases due to sensors and controllers
Solution Approach 1:
The system uses feedback from sensors that detect the auxiliary handle's presence to control the drive mechanism's torque output. The controller receives feedback signals and adjusts torque supply accordingly, creating a closed-loop control system. This feedback mechanism provides operational flexibility while keeping the control logic relatively simple and automated.
Solution Approach 2:
The power tool automatically detects whether the auxiliary handle is attached and self-adjusts its torque output without requiring manual intervention. The sensor-controller system operates autonomously, monitoring handle presence and modifying torque supply accordingly. This self-service capability enhances operational flexibility while minimizing the need for complex user interfaces or manual controls.
Data Source
AI summary
A power tool includes a housing, a drive mechanism supported within the housing, a spindle operatively coupled to an output of the drive mechanism such that torque from the drive mechanism rotates the spindle about an axis, and an accessory removably coupled to the housing. The drive mechanism is configured to supply up to a first maximum torque to the spindle when the accessory is removed from the housing. The drive mechanism is configured to supply up to a second maximum torque to the spindle greater than the first maximum torque when the accessory is coupled to the housing.