Mulching Lawn Mower Blade Segmentation for Leaf Processing
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Solution Overview
Problem
Existing lawn mower blades are unable to effectively cut leaves into a fine mulch, necessitating bagging, which is not always possible or desirable.
Innovation Solution
A mulching lawn mower blade design featuring a base cutting blade with inward-extending cutting edges and mulching cutting blades with upward curving shapes, allowing for efficient cutting of both grass and leaves into a fine mulch without the need for bagging, with the mulching blades being bolted or welded to the base blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional lawn mower blade is used, then grass cutting is effective, but leaves cannot be cut into fine mulch
Solution Approach 1:
The blade is divided into multiple functional sections: a base cutting blade with first and second cutting edges for grass cutting, and at least one mulching cutting blade with upward curving shapes for leaf mulching. This segmentation allows each section to perform its specific function optimally, enabling the blade to handle both grass and leaves effectively.
Solution Approach 2:
Different portions of the blade assembly have different geometric characteristics tailored to their specific functions. The base cutting blade has straight cutting edges for clean grass cutting, while the mulching cutting blades have upward curving shapes with larger radius of curvature to create fine mulch from leaves. This local differentiation of geometric properties achieves both grass cutting effectiveness and leaf mulching quality.
2Adaptability or versatility
If multiple mulching cutting blades are added, then leaf mulching capability is improved, but blade complexity increases
Solution Approach 1:
The mulching cutting blades are attached to the base cutting blade to form a unified blade assembly that functions as a single integrated unit. This merging approach allows the blade to handle both grass and leaves effectively while maintaining relatively simple attachment methods (welding or bolting), avoiding the need for complex multi-component systems.
Solution Approach 2:
The blade assembly is designed to perform multiple functions: the base cutting blade cuts grass, while the attached mulching cutting blades process leaves into fine mulch. This multi-functionality is achieved through a relatively simple additive structure, making the system versatile for handling different lawn debris types without requiring complex mechanisms.
3Productivity
If cutting edges are extended inward, then cutting effectiveness is improved, but blade length is reduced
Solution Approach 1:
Instead of extending cutting edges along the blade length (one dimension), the design curves the cutting edges upward in a perpendicular direction (another dimension). This dimensional change allows the cutting edges to extend effectively across the blade width while maintaining adequate blade length for proper engagement with the mower deck and drive shaft.
Data Source
AI summary
A mulching lawn mower blade preferably includes a base cutting blade and at least one mulching cutting blade. The base cutting blade includes a first cutting edge formed on one edge, extending inward from a first end thereof and a second cutting edge formed on an opposing edge, extending inward from a second end thereof. A middle section of the base cutting blade may have any suitable hole (s) or opening pattern (s) to accommodate attachment to a drive shaft of a lawn mower. The at least one mulching cutting blade may be a single mulching cutting blade, which is bolted to the drive shaft, or two separate mulching cutting blades, which are attached to the base cutting blade with any suitable method, such as welding. A first mulching cutting blade includes a first mulching cutting edge and a second mulching cutting blade includes a second mulching cutting edge.