Hand-Held Power Tool Contact-Pressure Switching for Percussive Control
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Solution Overview
Problem
Existing hand-held power tools, such as demolition hammers and hammer drills, lack efficient control mechanisms to manage contact pressure, leading to unintentional actuation risks and inefficient operation, particularly in percussive operations.
Innovation Solution
Incorporating a motor switching unit that senses contact-pressure characteristics between the tool unit and operating unit, using sensors to control the electric motor's rotational speed and switch between rotational and percussive operations based on contact pressure, thereby optimizing tool operation and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a motor switching unit with sensors is added to sense contact-pressure characteristics, then operation precision and safety are improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical control systems with sensor-based detection and electronic switching. The motor switching unit uses sensors to detect contact-pressure characteristics and automatically switches the motor between rotational and percussive operations, eliminating the need for complex mechanical linkages and manual control mechanisms.
Solution Approach 2:
The motor switching unit enables the power tool to automatically adjust its operating mode based on real-time contact-pressure sensing. The system self-regulates by detecting contact conditions and autonomously switching between operational states without requiring external intervention or complex mechanical feedback systems.
2Ease of operation
If the motor switching unit automatically switches based on contact pressure, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The motor switching unit enables the power tool to automatically adjust its operating mode based on real-time contact-pressure sensing. The system self-regulates by detecting contact conditions and autonomously switching between operational states without requiring external intervention or complex mechanical feedback systems.
Solution Approach 2:
The patent implements a feedback control loop where sensors continuously monitor contact-pressure characteristics and provide real-time data to the motor switching unit. This feedback mechanism enables automatic adjustment of motor operation mode, simplifying user interaction while maintaining precise control through electronic rather than mechanical means.
3Reliability
If sensor-based control is implemented to reduce unintentional actuation, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback control loop where sensors continuously monitor contact-pressure characteristics and provide real-time data to the motor switching unit. This feedback mechanism enables automatic adjustment of motor operation mode, simplifying user interaction while maintaining precise control through electronic rather than mechanical means.
Solution Approach 2:
The patent replaces complex mechanical control systems with sensor-based detection and electronic switching. The motor switching unit uses sensors to detect contact-pressure characteristics and automatically switches the motor between rotational and percussive operations, eliminating the need for complex mechanical linkages and manual control mechanisms.
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 solution enables uncomplicated and precise operation, reduces the risk of unintentional actuation, and ensures efficient energy use by adapting motor speed according to contact pressure, enhancing tool durability and user safety.
Implementation Method 1
the motor switching unit comprises at least one sensor element for sensing the contact-pressure characteristic
Implementation Method 2
the contact-pressure characteristic may be as a voltage or a current intensity, in particular sensed by a piezoelectric sensor element
Implementation Method 3
The bearing unit has at least one spring unit for damping a bearing movement and/or a percussive upon the operating unit
Implementation Method 4
The bearing unit has at least one spring unit for damping a bearing movement and/or a percussive upon the operating unit
Implementation Method 5
the bearing unit is designed to realize a transmission of force from the tool unit to the operating unit
Data Source
AI summary
A hand-held power tool includes an electric motor, a tool unit, and at least one operating unit. A motor switching unit is configured to sense a contact-pressure characteristic between the tool unit and the operating unit, and configured to switch the electric motor at least partially in dependence on the contact-pressure characteristic.