Mower Wheel Height Adjuster Mechanism
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Solution Overview
Problem
Existing wheel height adjusters for mowers require significant forces, often through deformation of materials, to change the height, which can be cumbersome and inefficient.
Innovation Solution
A wheel height adjuster assembly that includes a bracket, arm, sleeve, pin, and handle, allowing for manual adjustment of the ground engaging wheel's position relative to the mower housing, utilizing a spring mechanism to bias the pin into retainer locations for secure positioning and easy height adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional wheel height adjusters are used, then the wheel height can be adjusted, but large forces are required and the adjustment process is cumbersome
Solution Approach 1:
The adjuster assembly uses a dynamic linkage mechanism with an arm that rotates about a pivot point, allowing the wheel mount to move through an arc. This dynamic motion transforms small manual inputs at the handle into larger displacement movements at the wheel mount, reducing the force required for adjustment while maintaining operational effectiveness.
Solution Approach 2:
The linkage mechanism acts as an intermediary between the user's manual input and the wheel height adjustment. The handle, arm, and wheel mount form a mechanical system that translates small handle movements into larger wheel displacement, providing mechanical advantage and reducing the direct force needed from the user.
2Productivity
If traditional height adjustment mechanisms are used, then height change is achieved, but the process is inefficient and time-consuming
Solution Approach 1:
The rotatable arm mechanism enables quick height changes by allowing the wheel mount to swing through an arc rather than requiring linear pushing or pulling. This dynamic rotation significantly reduces the time and effort needed to adjust between different height settings compared to traditional mechanisms.
Solution Approach 2:
The adjuster uses discrete retainer locations that engage with the arm at specific positions during rotation. This periodic engagement allows for quick, standardized height settings rather than continuous adjustment, improving efficiency by providing predetermined optimal cutting heights that can be rapidly selected.
3Adaptability or versatility
If the wheel height is made adjustable, then cutting height flexibility is improved, but the device complexity increases
Solution Approach 1:
The adjuster assembly is segmented into distinct functional components: a handle for user input, an arm that rotates about a pivot, a wheel mount for attachment, and retainers for positioning. This segmentation allows each component to perform its specific function efficiently while keeping the overall design relatively simple and maintainable.
Solution Approach 2:
The rotatable arm serves multiple functions: it connects the handle to the wheel mount, provides the mechanical advantage for force reduction, enables the arc-shaped movement for height adjustment, and interfaces with the retainer locations for secure positioning. This multi-functionality reduces the need for additional components, maintaining simplicity while achieving adjustability.
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 efficient and user-friendly adjustment of the mower's cutting height with reduced manual effort, improving usability and operational efficiency.
Implementation Method 1
utilizing a spring mechanism to bias the pin into retainer locations for secure positioning
Data Source
AI summary
A mower is provided that includes a height-adjuster assembly that adjustably connects the ground engaging wheel to the housing of the mower at an adjustable height from the ground. The height-adjuster assembly includes a bracket fixed to the housing, an arm, a sleeve, a wheel mount, a pin, and a handle. The arm is rotatably mounted relative to the housing and the bracket about a pivot point. The sleeve is fixed to the arm for rotation with the arm relative to the housing and the bracket about the pivot point. A handle overlays the pin and the sleeve. The handle is configured to be grasped by a user for movement along a first direction to move the pin from a first position into a second position. Upon reaching the second position, the handle and the sleeve can be rotated to rotate the ground engaging wheel relative to the housing.