Chipping Hammer Power Control Using Lever Position and Timing
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Solution Overview
Problem
Chipping hammers present challenges for inexperienced users due to difficulties in handling power delivery and impact pulses, making safe and efficient operation difficult.
Innovation Solution
A method for open-loop and closed-loop control of a chipping hammer incorporating a drive, control device, sensor device, and handle apparatus with a pivotable lever element and signal transmitter, which adjusts rotational speed based on the position of the lever element and elapsed time to manage impact frequency and power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the chipping hammer operates at high power delivery and impact pulses, then productivity is improved, but ease of operation deteriorates for inexperienced users
Solution Approach 1:
The patent implements dynamic control of the chipping hammer's power delivery by adjusting rotational speed based on lever element position and elapsed time. The system transitions from static high-power operation to dynamic adaptive operation, modifying power delivery in real-time based on user input patterns to balance productivity with ease of operation.
Solution Approach 2:
The patent changes operational parameters (rotational speed, impact frequency, power delivery) based on detected lever element positions and time intervals. By varying these parameters dynamically, the system adapts power delivery to match user skill level and operational context, resolving the contradiction between high productivity and ease of operation.
2Power
If the drive operates at high rotational speed, then power delivery is improved, but safety deteriorates due to increased impact pulses
Solution Approach 1:
The patent employs feedback mechanisms by sensing lever element positions and using this information to control drive rotational speed. The system continuously monitors user input through the lever element and adjusts power delivery accordingly, creating a closed-loop control system that prioritizes safety while maintaining effective power delivery when needed.
Solution Approach 2:
The patent implements preliminary action by setting the drive to operate at reduced rotational speed initially, then gradually increasing power delivery based on elapsed time and sustained lever position. This preliminary low-power state allows the system to build up to higher power levels safely, preventing sudden high-impact pulses that could compromise operator safety.
Data Source
AI summary
Method for the open-loop and closed-loop control of a power tool containing a drive, a control device, a sensor, a transmission and a handle apparatus. The handle apparatus contains a lever element with a signal transmitter and pivotable relative to the sensor. A first and second position of the signal transmitter are sensed by the sensor, the distance between the first and second position corresponds to a first distance. The difference between a maximum distance of the lever element and the first determined distance is determined. A first rotational speed for the drive is set when the determined difference between the maximum distance of the lever element and the first determined distance corresponds at least to a first predetermined threshold value. A second rotational speed for the drive is set after the second position has been reached and after a predetermined period of time elapsed.