Power Tool Handle Feedback Control for Safe Grip-Based Startup
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Solution Overview
Problem
Chipping hammers operate at full power upon activation, making it difficult for users to maintain control and ensuring safe operation, especially when initially gripping the tool.
Innovation Solution
A handle apparatus with a pivotable lever element and signal transmitter, sensed by a sensor device, allows for open-loop and closed-loop control of the power tool, adjusting rotational speed based on the user's grip force, enabling safer and more controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the chipping hammer is activated, then the drive operates at maximum rotational speed and full power, but the user cannot maintain control and safe operation is compromised
Solution Approach 1:
The system dynamically adjusts the drive's rotational speed based on real-time detection of lever element position and user grip force. The control device modifies operational parameters continuously, transitioning from static full-power operation to dynamic adaptive control, allowing the power output to vary according to actual operational needs and user control capability
Solution Approach 2:
The sensor device detects the position of the lever element and the force applied by the user's grip, feeding this information back to the control device. The control device processes this feedback and adjusts the drive's rotational speed accordingly, creating a closed-loop control system that ensures user control while maintaining adequate power output
2Productivity
If the drive operates at maximum rotational speed, then productivity is high, but safety and user control are compromised
Solution Approach 1:
The system transitions from static maximum-speed operation to dynamic speed adjustment. The drive's rotational speed is continuously modified based on lever element position and grip force detection, enabling the system to maintain high productivity when conditions permit while ensuring safety when user control is insufficient
Solution Approach 2:
Real-time feedback from the sensor device monitoring lever position and grip force enables the control device to adjust productivity levels dynamically. The system maintains high operational efficiency when the user demonstrates proper control while automatically reducing power when safety concerns are detected, resolving the contradiction between productivity and safety
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
The system allows for adjustable impact energy based on user input, ensuring safe and effective operation by adapting the chipping hammer's power output according to the user's grip, enhancing control and safety.
Implementation Method 1
sensing a first and second position of the signal transmitter by the sensor device
Data Source
AI summary
Handle apparatus on a power tool, in particular a chipping hammer, having a drive, a control device, a transmission device, wherein the handle apparatus contains a lever element that is pivotable relative to a housing of the power tool. The lever element is movable reversibly relative to the housing of the power tool by exertion of a force in one direction, and a sensor device is contained for sensing at least one first or second position of the lever element relative to the housing of the power tool, wherein a first rotational speed value for the drive is settable depending on the first sensed position of the lever element relative to the housing of the power tool or at least one second rotational speed value for the drive is settable depending on the second sensed position of the lever element relative to the housing of the power tool.