Power Tool Handle Control for Safe Speed Activation
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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 continues to run at maximum rotational speed even when the user has not yet securely gripped the tool.
Innovation Solution
A handle apparatus with a pivotable lever element and signal transmitter that allows the control device to sense positions and acceleration, triggering the drive to switch from activation to deactivation mode when a predetermined threshold is reached, utilizing a brake mechanism for quick stoppage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the drive is operated at maximum rotational speed upon activation, then the chipping hammer operates at full power, but the user cannot maintain sufficient control and safe operation
Solution Approach 1:
The patent applies dynamics by making the drive speed variable rather than fixed at maximum. The control device dynamically adjusts the rotational speed of the drive based on real-time acceleration feedback from the sensor device. When acceleration exceeds a threshold (indicating sudden movement or loss of control), the system automatically reduces speed, thereby maintaining both high power capability and user control safety
Solution Approach 2:
The patent implements feedback control by using a sensor device to continuously monitor the acceleration of the chipping hammer and feeding this information back to the control device. The control device processes this feedback and adjusts the drive speed accordingly, creating a closed-loop control system that ensures safe operation while maintaining full power when needed
2Productivity
If the drive continues to run at maximum rotational speed after activation, then productivity is maintained, but safety is compromised when the user has not yet securely gripped the tool
Solution Approach 1:
The sensor device continuously monitors acceleration and provides feedback to the control device, which adjusts the drive speed in real-time. This feedback mechanism allows the system to maintain productivity by keeping the drive at maximum speed during stable operation while automatically reducing speed when acceleration thresholds indicate potential safety issues
Solution Approach 2:
The patent changes the operational parameter of drive speed dynamically based on acceleration conditions. The control device modifies the speed parameter from maximum to reduced levels when the sensor detects acceleration exceeding the predetermined threshold, thereby balancing productivity with safety through parameter adaptation
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 safe and controlled operation of the chipping hammer by allowing the drive to adjust power based on user input, ensuring adequate handling and preventing accidental start-ups.
Implementation Method 1
sensor device (13) for sensing a first and second position of the signal transmitter (14)
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.