Integrated Impact and Blocking Detection in Hand-Held Power Tools
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Solution Overview
Problem
Existing hand-held power tools lack efficient detection and control mechanisms for impact and blocking parameters, leading to suboptimal performance and reliability in driving insertion tools, particularly in rotational and translational movements.
Innovation Solution
Integration of an impact detection unit and a blocking detection unit, both designed in one piece, along with a sensor element that includes a three-axis acceleration sensor, to detect linear and angular accelerations, and an open-loop/closed-loop control unit for precise control of the impact tool unit, enabling effective open-loop and closed-loop control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate impact detection unit and blocking detection unit are used, then detection accuracy is improved, but device complexity and component count increase
Solution Approach 1:
The patent combines the impact detection unit and blocking detection unit into a single integrated detection system. The impact detection unit detects linear acceleration parallel to the processing axis, while the blocking detection unit detects angular acceleration about the processing axis. By merging these two detection functions into one unified unit, the patent reduces component count and simplifies the overall device structure while maintaining the ability to independently detect both impact and blocking parameters through separate sensor elements within the integrated unit.
2Reliability
If multiple separate detection units are used, then detection reliability is improved, but installation space increases
Solution Approach 1:
The patent implements a nested detection system where multiple sensor elements are integrated within a single compact detection unit structure. The impact sensor and blocking sensor are arranged in a nested or closely integrated configuration, allowing both detection functions to coexist in a limited space. This nested arrangement enables the system to maintain high detection reliability through multiple independent sensors while minimizing the overall installation footprint.
3Device complexity
If integrated detection unit is used, then device complexity is reduced, but detection precision may deteriorate
Solution Approach 1:
Within the integrated detection unit, the patent segments the detection functions into distinct sensor elements: an impact sensor for detecting linear acceleration and a blocking sensor for detecting angular acceleration. This segmentation allows each sensor type to be optimized for its specific measurement task while being housed within a unified structural unit. The segmented sensor elements maintain their individual precision characteristics even though they share a common mounting structure and signal processing interface.
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 configuration allows for precise and reliable control of the impact tool unit, reducing component count and installation space, enhancing operational efficiency and reliability by accurately managing translational and rotational movements.
Implementation Method 1
The sensor element can preferably comprise at least one strain gauge, at least one sensor of a micro-electro-mechanical system (MEMS), in particular at least one gyro sensor, at least one piezo-ceramic sensor chip
Data Source
AI summary
A hand-held power tool device comprises an impact tool unit, an impact detection unit, and a blocking detection unit. The impact tool unit is configured to drive an insertion tool at least partially in at least one of a rotational fashion and a translatory fashion. The impact detection unit is configured to detect at least one impact parameter, such as linear acceleration running at least substantially parallel to a processing axis of the insertion tool. The blocking detection unit is configured to detect at least one blocking parameter, such as at least one an angular acceleration about the processing axis of the insertion tool. The impact detection unit and the blocking detection unit are formed at least partially as one-piece.