Chipping Hammer Handle Control for Safer Impact Energy Ramp-Up
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Solution Overview
Problem
Existing chipping hammers operate at full power upon activation, which can lead to poor control and safety issues for users who have not yet fully grasped the tool, and may surprise users with unexpected output of strikes.
Innovation Solution
A method for open-loop and closed-loop control of a chipping hammer that includes a handle apparatus with a pivotable lever element and a signal transmitter, allowing the control device to adjust the rotational speed of the drive based on the acceleration of the signal transmitter, thereby controlling the impact energy output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the chipping hammer operates at full power upon activation, then the productivity and impact energy output are maximized, but the ease of operation and user safety deteriorate due to poor control and unexpected strikes
Solution Approach 1:
The system dynamically adjusts the drive rotational speed based on real-time acceleration feedback. The control device continuously monitors acceleration via the sensor device and signal transmitter, then adjusts the drive speed accordingly, transitioning from static full-power operation to dynamic adaptive control that responds to user handling conditions
Solution Approach 2:
The system implements closed-loop feedback control where the sensor device detects acceleration of the signal transmitter, the control device processes this information to determine when acceleration reaches predetermined threshold values, and subsequently adjusts the drive rotational speed. This feedback mechanism enables the system to self-regulate power output based on actual operating conditions
2Productivity
If the drive rotational speed is set to maximum for high impact energy output, then the productivity is improved, but the reliability and safety deteriorate when the user has not yet firmly grasped the tool
Solution Approach 1:
The system performs preliminary detection of user grasp stability through acceleration sensing before allowing full power operation. By monitoring acceleration thresholds during the initial activation phase, the system prepares to adjust power output in advance, preventing unsafe full-power operation before the user has firmly grasped the tool
Solution Approach 2:
Real-time acceleration feedback from the sensor device and signal transmitter enables the control device to continuously assess handling stability and adjust drive rotational speed accordingly, ensuring that high impact energy output is only achieved when safe handling conditions are confirmed
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 enables users to work more safely and effectively with a chipping hammer by allowing for controlled adjustment of power output based on user input, reducing the risk of accidents and improving operational precision.
Implementation Method 1
a lever element with a signal transmitter, said lever element being pivotable relative to the sensor device
Data Source
AI summary
Method for the open-loop and closed-loop control of a power tool, in particular a chipping hammer, having a drive, a control device, a sensor device, a transmission device and a handle apparatus, wherein the handle apparatus contains a lever element with a signal transmitter, said lever element being pivotable relative to the sensor device. The method includes: sensing a first and second position of the signal transmitter by the sensor device; determining an acceleration of the signal transmitter from the first position to the second position by the control device; setting a first rotational speed for the drive by the control device for the output of a first impact energy value of the transmission device when the determined acceleration reaches a first predetermined threshold value or setting a second rotational speed for the drive by the control device for the output of a second impact energy value of the transmission device when the determined acceleration reaches a second predetermined threshold value. A handle apparatus on a power tool, in particular a chipping hammer, is also provided.