Pivotally Mounted Front Frame for Riding Mower Deck Maintenance
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Solution Overview
Problem
Mid-mount riding mowers face challenges in maintenance accessibility due to their compact design, leading to inadequate maintenance and uneven cutting performance on uneven terrain, and existing solutions are costly and not retrofittable to existing designs.
Innovation Solution
A self-propelled lawn mower design with a pivotally mounted front frame and telescoping mower deck push arms, allowing for easy deck removal and adjustment, and incorporating gauge wheels and shock absorbers for improved terrain following and maintenance accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the mower uses a compact mid-mount design, then the footprint size is reduced, but the accessibility to the mower deck for maintenance becomes difficult
Solution Approach 1:
The front castor assembly is made dynamically movable between a forward position during mowing and a retracted position for maintenance. The swing arms allow the castor wheels to pivot from a forward operating position to a retracted maintenance position, dynamically changing the deck accessibility based on operational needs.
Solution Approach 2:
The front castor assembly is segmented into movable components (swing arms, castor wheels) that can be independently positioned. This segmentation allows the castor wheels to be moved out of the way during maintenance while maintaining the compact mid-mount structure during operation.
2Stability of the object's composition
If the front castor wheels are solidly attached to a rigid frame, then the structural stability is improved, but the ride quality on uneven ground becomes rough
Solution Approach 1:
The rigid frame is modified to include dynamic swing arm mechanisms that allow the front castor wheels to move independently. This creates a semi-rigid structure that maintains overall stability while allowing local adaptation to terrain variations through the swing arm pivoting motion.
Solution Approach 2:
The frame structure transitions from completely rigid to having localized flexible sections at the front castor assembly. The swing arms provide localized mobility at the front wheels while the rest of the frame remains rigid, creating different structural qualities in different parts of the mower.
3Ease of operation
If the front castor wheels are mounted on a pivoting axle, then the ride quality on uneven ground is improved, but the mower deck follows the rear wheels causing uneven cutting
Solution Approach 1:
The castor assembly uses dynamic swing arms that allow the front wheels to pivot independently, enabling the front of the mower to adapt to terrain variations while the rear wheels maintain steady deck height for even cutting.
Solution Approach 2:
The wheel mounting system is segmented into independent swing arms for each front wheel, allowing them to move independently to follow terrain while the mower deck remains stable for even cutting.
4Ease of operation
If hydraulic cylinders or electric screw actuators are used to hinge the deck forward, then the maintenance accessibility is improved, but the cost and device complexity increase
Solution Approach 1:
The system uses self-service mechanical advantage through gravity and spring-loaded mechanisms to hinge the deck forward for maintenance. The deck's own weight and simple spring actuators provide the force needed, eliminating the need for complex hydraulic or electric systems.
Solution Approach 2:
The invention replaces expensive, complex hydraulic or electric actuators with simple, inexpensive mechanical components such as springs and gravity-assisted hinges that can be easily manufactured and replaced.
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
Enhances maintenance accessibility, ensures even cutting performance on uneven terrain, and is cost-effective for both new and existing mower designs by allowing for easy deck servicing and adjustment without the need for expensive hydraulic or electric components.
Implementation Method 1
a pair of front wheels mounted about a castor axis
Implementation Method 2
incorporating gauge wheels and shock absorbers for improved terrain following
Implementation Method 3
incorporating gauge wheels and shock absorbers for improved terrain following
Data Source
AI summary
A mid-mount riding rotary mower which has a two-piece frame. The frame includes a front section that is pivotally connected to a rear section. The mower deck is carried beneath the mower between the front and rear wheels. The mower deck is attached to the front frame and follows the movement of the front wheels. The front frame includes swing arms that carry the front wheels from a first position in front of the mower to a side position for deck maintenance. In the maintenance position the deck can be removed from under the mower easily by rolling the deck forward. Either detachment of the deck or telescoping arms enable the deck to be moved out from under the mower. The deck can then be tilted up to a stable vertical orientation for maintenance of the blades.