Pivoting Tool Handle With Speed Staging for Safer Hammer 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, as the drive's maximum rotational speed is engaged before the user can firmly grasp the handles.
Innovation Solution
A handle apparatus with a pivotable lever element and sensor system that adjusts the drive's rotational speed based on the lever's position, allowing for controlled activation and increased impact energy through an impact mechanism, enabling safer and more controlled operation by varying the rotational speed in response to user force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the drive is operated at maximum rotational speed upon activation, then high impact energy is generated, but user control and safety are compromised
Solution Approach 1:
The system dynamically adjusts the drive's rotational speed based on the lever element's position. When the lever is in the first position, a first rotational speed is set; when in the second position, a higher second rotational speed is set. This dynamic adjustment allows the system to provide high power when needed while maintaining user control during activation.
Solution Approach 2:
A sensor device detects the position of the lever element and provides feedback to the control system. Based on this feedback, the system automatically adjusts the drive's rotational speed accordingly. This closed-loop feedback mechanism ensures that the drive operates at the appropriate speed based on real-time user input through the lever position.
2Productivity
If the drive operates at full power immediately upon activation, then productivity is high, but safety and operational control deteriorate
Solution Approach 1:
The system requires the user to first position the lever element in the appropriate position before full power operation can be achieved. This preliminary action through the lever allows the user to prepare and gain control before the high-power operation begins, ensuring safe and reliable operation while maintaining productivity.
Solution Approach 2:
The rotational speed of the drive is dynamically adjusted based on the lever element position detected by the sensor device. The system transitions from a first rotational speed to a higher second rotational speed as the lever moves from the first position to the second position, enabling progressive power delivery that maintains safety while achieving high productivity.
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
Enables easy and safe operation of chipping hammers by adjusting the rotational speed of the drive in response to user input, providing controlled and increased impact energy based on the force applied, enhancing user safety and operational efficiency.
Implementation Method 1
the sensor device to contain at least one first and second Hall sensor for sensing the at least one magnet
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 for the drive is set when the first position of the lever element relative to the housing of the power tool is sensed and a second rotational speed for the drive is set when the second position of the lever element relative to the housing of the power tool is sensed.