Offset Cutting Units for Grass Mowing Machines
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Solution Overview
Problem
Existing grass mowing machines face instability and risk of tipping over when offsetting cutting units on steep slopes, and may damage edges of sand traps or bunkers due to uneven weight distribution and poor cut quality from uncut turf contact.
Innovation Solution
A mechanism with lift arms that pivotably attach to both the traction vehicle and cutting units, allowing for lateral offset and raising/lowering of cutting units, maintaining a low center of gravity and stable operation while enabling precise trimming along edges without shifting the vehicle's weight significantly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cutting units are offset to the side using a single carrier frame, then the cutting units can reach edges of sand traps or bunkers, but the center of gravity is moved into a less favorable position causing instability and potential tipping over
Solution Approach 1:
The patent divides the single carrier frame into two separate carrier frames, one for each cutting unit. This segmentation allows each cutting unit to be independently positioned and offset, enabling them to reach edges of sand traps or bunkers without significantly moving the overall center of gravity, thus maintaining stability while achieving the desired adaptability.
2Adaptability or versatility
If cutting units are shifted to one side of the machine, then the cutting units can trim on that side only, but the opposite side wheel and tire may roll on uncut turf resulting in poor cut quality
Solution Approach 1:
By providing separate carrier frames for each cutting unit, the patent enables independent lateral positioning of each cutting unit. This allows the machine to trim on one side while keeping the opposite cutting unit in a neutral position, preventing the opposite wheel from rolling on uncut turf and maintaining cut quality.
Solution Approach 2:
The patent implements dynamically adjustable carrier frames that can be independently positioned for each cutting unit. This dynamic adjustment capability allows the operator to optimize the position of each cutting unit based on the specific trimming task, ensuring both unilateral trimming capability and high cut quality.
3Device complexity
If a single carrier frame is used to offset cutting units, then the structure is simpler, but the mechanism cannot independently position each cutting unit and may cause instability on steep slopes
Solution Approach 1:
The patent segments the single carrier frame into two independent carrier frames, one for each cutting unit. Although this increases structural complexity slightly, it enables independent positioning of each cutting unit, providing the adaptability needed for steep slopes and various trimming conditions while maintaining control over each cutting unit's position.
Data Source
AI summary
A mechanism for offsetting cutting units for a grass mowing machine includes lift arms that pivot between a first lowered position in which the cutting units are offset to the left of the traction vehicle, a second lowered position in which the cutting units are offset to the right of the traction vehicle, and a raised position intermediate the first and second lowered positions. Each lift arm has a first pivot axis and a second pivot axis parallel to the first pivot axis.