Hand-Held Power Tool Speed Regulating Disc Mechanism
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Solution Overview
Problem
Conventional hand-held electrical power tools lack the ability to achieve stepless speed change, limiting their operational flexibility and convenience.
Innovation Solution
A hand-held electrical power tool design featuring a speed regulating device with a potentiometer and speed regulating disc, connected to a circuit board, allowing for continuous adjustment of motor speed from zero to maximum through a 0-360° rotation, integrated into the operating handle for convenient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed gear operating member is used to control working speed, then the structure is simple, but stepless speed change cannot be achieved
Solution Approach 1:
The patent transforms the static fixed gear operating member into a dynamic speed regulating operating member that can rotate continuously (0-360°) to drive a potentiometer, enabling stepless speed adjustment from zero to maximum while maintaining operational simplicity
Solution Approach 2:
The patent replaces the purely mechanical fixed gear system with an electro-mechanical system using a potentiometer and rotation angle sensor, allowing for continuous speed variation while keeping the operating mechanism simple and intuitive
2Adaptability or versatility
If a fixed gear system is used for speed control, then the device structure is simple, but operational versatility is limited
Solution Approach 1:
The speed regulating operating member enables dynamic speed control through continuous rotation (0-360°), allowing the motor speed to be adjusted from zero to maximum in a stepless manner, significantly enhancing adaptability for different working conditions
Solution Approach 2:
The patent uses a potentiometer to convert the rotation angle of the operating member into variable resistance, thereby changing the electrical parameter (resistance) to control motor speed continuously, achieving wide speed control range
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 stepless speed change of the motor, enhancing operational convenience and flexibility by allowing users to adjust speed according to specific tasks, facilitating more efficient use of the tool.
Implementation Method 1
the speed regulating switch is a potentiometer, and the speed regulating operation member is a speed regulating disc cooperating with the potentiometer and the outputting current of the potentiometer is adjusted when the speed regulating disc is rotated
Data Source
AI summary
A hand-held electrical power tool includes a working device for performing working function of the hand-held electrical power tool, a power device including a motor for driving the working device, a power supplying unit for supplying power to the power device, and an operating device through which a user can operate. The operating device includes an operating handle and a speed regulating device arranged beside the operating handle. The speed regulating device includes a speed regulating switch and a speed regulating operating member connected to the speed regulating switch and driving the speed regulating switch. When the rotating speed of the motor increases from zero to the maximum, the rotating angle of the speed regulating operating member is 0-360 degrees.