Integral Height-of-Cut Linkage for Lawn Striping
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Solution Overview
Problem
Existing lawn mowers lack an effective mechanism to achieve a striped turf appearance through controlled grass bending, which is desirable for aesthetic enhancement in professional and residential landscaping.
Innovation Solution
A height-of-cut system with integral grass striping roller, utilizing bellcranks and a connecting rod to adjust the elevation of mower wheels and cutting blade relative to the ground, ensuring the connecting rod remains below the cutting plane to bend grass blades during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate striping roller is added to achieve grass bending, then the striping function is improved, but the device complexity increases
Solution Approach 1:
The patent combines the striping roller function with the existing height-of-cut (HOC) system by integrating the striping roller onto the HOC bellcrank assembly. The striping roller is mounted on the bellcrank such that it moves with the HOC adjustment mechanism, eliminating the need for a separate striping device and reducing overall system complexity while maintaining both cutting height adjustment and grass striping capabilities
2Adaptability or versatility
If the connecting rod is positioned to bend grass effectively, then the striping effect is improved, but it may interfere with the cutting blade operation
Solution Approach 1:
The patent positions the striping roller at a specific location on the bellcrank where it contacts only the uncut grass standing between the cutting blade and the ground. The roller is strategically placed to bend grass in the area between the blade path and the ground surface, ensuring effective striping while maintaining clear separation from the cutting blade's operational zone, thus preventing interference with cutting operations
3Ease of operation
If the HOC system adjusts wheel height to change cutting elevation, then the cutting height control is improved, but the mechanism complexity increases
Solution Approach 1:
The patent designs the HOC bellcrank system to serve dual functions: adjusting the cutting blade elevation relative to the ground and simultaneously driving the striping roller to bend grass. By making the striping roller integral to the bellcrank assembly, the system achieves multi-functionality where a single mechanism performs both height adjustment and striping operations, reducing the need for additional independent mechanisms
Data Source
AI summary
A power lawn mower having a height-of-cut (HOC) system adapted to adjust a height of a cutting blade of the mower relative to a ground surface upon which the mower operates by adjusting the vertical position of two wheels of the mower relative to a chassis of the mower. The HOC system may include a transverse connecting rod that allows movement of a single HOC control to simultaneously change the vertical position of both wheels throughout an HOC range. A lowermost portion of the connecting rod may remain at an elevation below a cutting plane of the cutting blade (and/or below lower surfaces of the chassis) regardless of the position of the cutting blade within the HOC range to provide a grass striping effect.