Asymmetric Mower Deck Geometry for Cleaner Grass Cutting
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Solution Overview
Problem
Battery-powered outdoor power tools, such as lawnmowers, face issues with reduced cut quality due to grass laying down before being cut and grass clippings becoming stuck or not being dispersed effectively, leading to clumping and inefficient clipping management.
Innovation Solution
The lawnmower features an elongated mower deck with a forward-extending lip and a rake or wheel rake to precondition grass, a trailing conditioner to break up clumps, and a diffuser to distribute clippings evenly, enhancing cutting performance and clipping management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional mower deck is used, then the structure is simple, but the cut quality is reduced due to grass laying down before being cut
Solution Approach 1:
The mower deck is designed with an elongated forward direction and reduced lateral extension, creating an asymmetric shape. This asymmetric geometry allows the front lip to extend further forward, creating a larger no-cut zone that prevents grass from laying down before cutting, thereby improving cut quality without requiring complex additional components
Solution Approach 2:
The invention changes the dimensional proportions of the mower deck by extending the forward dimension (first radial length) relative to the lateral dimension (second radial length), creating an aspect ratio of at least 1.05. This dimensional transformation optimizes the no-cut zone formation and grass blade interaction with the cutting implement, improving cut quality through geometric optimization rather than adding complex mechanisms
2Manufacturing precision
If the mower deck is elongated forward, then the no-cut zone is minimized and cut quality improves, but the device complexity increases
Solution Approach 1:
The invention optimizes specific geometric parameters of the mower deck: the aspect ratio of the first radial length to the second radial length is set to at least 1.05, and the tip distance is set to at least 1.5 inches. These parameter changes create the optimal no-cut zone and grass blade interaction zone, improving cut quality through mathematical optimization of existing structural elements rather than adding complex components
3Device complexity
If grass clippings are deposited on the ground without a bag, then the device complexity is reduced, but the clippings become stuck and clumping occurs
Solution Approach 1:
The diffuser acts as an intermediary component between the cutting implement and the ground. It receives grass clippings from the cutting implement and distributes them evenly across the lawn surface, preventing clumping and ensuring proper clipping distribution while maintaining the simplicity of ground deposition without requiring complex bagging or collection systems
Data Source
AI summary
A lawnmower including: a mower deck defining a volume; a driving element configured to drive a cutting implement within the volume; a plurality of wheels supporting the mower deck; and a handle extending in a rearward direction from the mower deck, wherein the mower deck defines a first radial length A1, as measured from a central vertex of the cutting implement to a front lip of the mower deck, and a second radial length A2, as measured from the central vertex to a lateral lip of the mower deck, wherein an aspect ratio of the first and second radial lengths [A1/A2] is at least 1.05, and wherein a tip distance, as measured between the front lip of the mower deck and a nearest part of the cutting implement when the cutting implement extends in a forward-rearward direction, is at least 1.5 inches.