Adjustable Twist Control for Self-Propelled Mower Speed
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Solution Overview
Problem
Self-propelled machines like lawn mowing machines often require operators to control multiple functions simultaneously, which can be cumbersome due to the need for separate systems for speed control and operator presence, and these systems may not be optimally oriented for all users, affecting comfort and ease of use.
Innovation Solution
An adjustable variable speed twist control mechanism is integrated into the handle of self-propelled machines, allowing operators to adjust the angle of the twist control to better suit individual preferences, and is operatively connected to the variable speed transmission via a cable for controlling the propulsion speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single fixed orientation twist control is used, then the device complexity is reduced, but the ease of operation deteriorates for operators of different heights and preferences
Solution Approach 1:
The twist control mechanism is made adjustable rather than fixed, allowing operators to change the angular orientation of the control relative to the handle. This dynamic adjustment capability enables the system to adapt to different operator preferences and heights, improving ease of operation without significantly increasing complexity
Solution Approach 2:
The angular parameter of the twist control orientation is made variable, allowing operators to adjust the control angle to their preference. This parameter change enables the same basic mechanism to serve multiple operators comfortably, resolving the contradiction between simplicity and operational comfort
2Device complexity
If separate control systems are used for speed control and operator presence, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent combines the speed control function and operator presence control function into a single integrated twist control mechanism. By merging these functions, the system reduces the number of separate controls the operator must manipulate, simplifying operation while maintaining the reliability of independent function control through the unified mechanism
Data Source
AI summary
Apparatuses and methods are provided for controlling a self-propelled machine, such as a lawn mowing machine, including a housing, a handle attached to the housing, and a prime mover attached to the housing with a variable speed transmission for propelling the mowing machine. A variable speed adjustable twist control is provided and can include an elongate body moveable in a twisting manner and an adjustable bracket lockably adapted to the elongate body for twisting with the elongate body and the adjustable bracket having an inner channel adapted for guiding a cable control connector operatively connected to the variable speed transmission through a cable for controlling the variable speed transmission, whereby self-propelled speed of the mowing machine can be controlled by operating the adjustable twist control.