Power Tool Torque Sensor Manual Tightening Control
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Solution Overview
Problem
Existing power tool systems for tightening rotatable fastening elements are time-consuming and inflexible, requiring advance planning for each torque value, limiting unscheduled work on construction sites with multiple fastening elements of different torque values.
Innovation Solution
A power tool system with an electric motor, torque sensor, and integrated control unit that allows for manual presetting and display of desired torque values, enabling faster and more flexible operation by automatically switching off the motor when the value is approached, followed by manual final tightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a keyboard or flip-setting device is used to preset torque values, then the desired torque value can be set accurately, but the operation becomes time-consuming and requires advance planning for each fastening element
Solution Approach 1:
The torque sensor and control unit automatically detect the torque value during manual tightening and display it on the display device, eliminating the need for manual presetting via keyboard or flip-setting device. The system serves itself by automatically reading and displaying the torque value, saving time while maintaining accuracy.
Solution Approach 2:
The patent replaces the mechanical/electronic presetting mechanisms (keyboard, flip-setting device) with an automatic torque detection system using a torque sensor that reads the actual torque value during operation and displays it, eliminating the need for advance mechanical presetting.
2Manufacturing precision
If torque values are preset for each fastening element, then the tightening can be controlled accurately, but the flexibility to work unscheduled on construction sites is reduced
Solution Approach 1:
The system transitions from static pre-set torque values to dynamic real-time torque detection. The torque sensor continuously monitors and displays the actual torque value during tightening operations, allowing the worker to adapt to different fastening elements on construction sites without prior planning, while maintaining precise control through real-time feedback.
3Manufacturing precision
If manual tightening is used for final tightening, then the desired torque value can be reached precisely, but the overall tightening process becomes slower
Solution Approach 1:
The torque sensor and display device provide continuous real-time feedback during the entire tightening process, from initial motor-driven tightening to final manual tightening. This continuous monitoring allows the worker to seamlessly transition between motor operation and manual tightening without interruption, maintaining both speed and precision throughout the entire process.
Data Source
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AI summary
The present invention relates to a power tool (2, 30, 32), comprising an electric motor (6) including a rotor (8) and a stator (10), a torque sensor (16) for measuring the torque value during tightening of rotatable fastening elements, and an operation control unit (18), integrated in or in communication with the power tool. The power tool (2, 30, 32) comprises means (26, 28) for preventing rotation of the rotor (8). The present invention also relates to a method for tightening rotatable fastening elements by use of the power tool.