Lawn Mower Control Lever with Preselector Override
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Solution Overview
Problem
Motor-driven landscape maintenance devices often require operators to maintain hand positions for extended periods, leading to discomfort and inefficiency, especially during professional use with frequent interruptions in monotonous tasks.
Innovation Solution
A motor-driven landscape maintenance device with a functional unit combining a preset selector and a manual selector on a transmission or motor-side control lever, where the preselector and manual controller interact through a bridging unit, allowing optimal operating sequences and easy restoration of preselected positions without repeated direct actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If control elements are arranged on the guide link for manual operation, then drive control functionality is achieved, but operating comfort deteriorates due to the need to maintain hand positions for extended periods
Solution Approach 1:
The control system is segmented into two independent parts: a preselector for setting drive parameters and a manual controller for operational adjustments. This segmentation allows the preselector to be positioned away from the guide link, eliminating the need to maintain hand positions on the guide link during operation.
Solution Approach 2:
A control lever acts as an intermediary between the preselector and the drive system. The preselector sets the desired drive parameters by positioning the control lever, while the manual controller can override this positioning during operation. This intermediary mechanism transfers the control function from the guide link to a dedicated control system.
2Ease of operation
If a preselector and manual controller are combined in a functional unit, then operating comfort improves by allowing easy restoration of optimal positions, but device complexity increases
Solution Approach 1:
The preselector and manual controller are merged into a single functional unit with a shared control lever. The preselector establishes a desired position of the control lever, while the manual controller can override this positioning. Both controls act on the same mechanical element (control lever), simplifying the overall structure while providing advanced functionality.
Solution Approach 2:
The control lever serves multiple functions: it is positioned by the preselector for optimal drive parameters and can be overridden by the manual controller during operation. This single element handles both automated preselection and manual intervention, eliminating the need for separate control mechanisms.
3Adaptability or versatility
If the manual controller has overriding effect on the preselector, then operational flexibility improves during interruptions, but control system complexity increases
Solution Approach 1:
Instead of the manual controller being subordinate to the preselector, the manual controller is designed to override the preselector's positioning. The normal operation follows the preselector's setting, but during interruptions or emergencies, the manual controller takes precedence by directly positioning the control lever, reversing the usual hierarchy.
Solution Approach 2:
The preselector performs preliminary action by establishing the optimal drive parameters before operation begins or after interruptions. The manual controller is prepared to override this preliminary setting when needed, allowing quick adaptation to changing conditions without complex reprogramming or adjustment mechanisms.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The motor-driven landscape maintenance device (1) has a drive controller in area of the motor or an associated gear (5). The drive controller has a manual operation. The operating elements (2,3,4) formed as hand lever or hand wheels are provided, which project from a guide arm (6) and are connected with a control lever provided in the area of the gear by bowden cable (7) or linkage portions, so that the extension of the control lever is used for adjusting the drive direction (F) in forward- and reverse drive or working speed (D). The transmission-sided control lever is provided with a code plate and a manual adjuster that has an over-riding effect in relation to the code plate. The code plate and the manual adjuster are connected in the region of a control device.