Garden Tool Travel Drive Speed Control via Displacement Sensor
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Solution Overview
Problem
Conventional garden tools require manual pushing, limiting user comfort and efficiency, and lack effective speed control mechanisms for variable speed settings.
Innovation Solution
An electric garden tool with a controllable travel drive system and a closed-loop speed control device featuring a user-operable operating element and a displacement sensor device, allowing for automatic and variable speed control without manual pushing, enhancing user comfort and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual pushing is required to move the garden tool, then the user can control the tool's movement, but the user comfort and efficiency deteriorate due to physical effort
Solution Approach 1:
The travel drive system enables the garden tool to move itself automatically without requiring manual pushing. The drive system propels the tool along the floor, making the tool self-service in terms of locomotion while the user only needs to guide it, thereby improving both user comfort and operational efficiency
Solution Approach 2:
The patent replaces the manual mechanical pushing system with an automated travel drive system. This substitution eliminates the need for direct physical contact and force application by the user, transforming the control mechanism from manual mechanical operation to automated drive system control
2Adaptability or versatility
If a fixed single-value speed is used for the garden tool, then the device construction is simple, but the adaptability to different operating conditions deteriorates
Solution Approach 1:
The speed control device incorporates a variable speed setting mechanism that allows the travel speed to be dynamically adjusted during operation. This dynamic capability enables adaptation to different operating conditions and terrain types, transforming the fixed-speed system into a flexible variable-speed system
Solution Approach 2:
The patent implements variable speed control by allowing changes in the travel speed parameter. The speed control device enables the user to adjust the speed parameter according to specific application requirements, thereby improving adaptability without requiring complete system redesign
3Ease of operation
If the displacement sensor device is fixed in position, then the construction is simpler, but the ease of adjusting speed settings deteriorates
Solution Approach 1:
The displacement sensor device is integrated within the speed control device housing, with the sensor positioned to detect the position of the operating element. This nested arrangement allows the sensor to move or be positioned relative to other components, enabling easy speed adjustment while maintaining a compact and manageable construction
Data Source
AI summary
A garden tool has a controllable travel drive system, wherein the travel drive system is designed to propel the garden tool, and a speed control device, wherein the speed control device has a user-operable operating element and a displacement sensor device. At least one sensor part of the displacement sensor device is supported so as to be movable in translation. The operating element is designed by its operation to displace at least the sensor part in translation. A sensor signal of the displacement sensor device is dependent on a translational position of at least the sensor part. The speed control device is designed for controlling the travel drive system for the variable setting of a travel speed of the garden tool in accordance with the sensor signal.