Curved Grass Cutting Blade with Propeller Trailing Edge
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Solution Overview
Problem
Conventional grass cutting blades suffer from blockages, inefficiencies in cutting tall or wet grass, and leave behind unsightly threads due to their straight design and limited air flow generation, leading to reduced performance and appearance issues.
Innovation Solution
A propeller-style blade with sabre-shaped cutting edges and a trailing edge resembling a propeller blade, generating an air flow to lift and expel cut grass, cutting by slicing rather than striking, and maintaining high rotation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a straight blade is used for cutting grass, then the cutting mechanism is simple, but the blade creates blockages and leaves threads that spoil the appearance
Solution Approach 1:
The blade is designed with a curved leading edge that extends from the central hole to the distal end, replacing the conventional straight blade geometry. This curvature allows the blade to slice through grass more effectively, preventing blockages and threads while maintaining structural simplicity
Solution Approach 2:
The blade incorporates a curved leading edge as a distinct functional segment separated from the straight trailing edge. This segmentation allows the cutting portion to have optimized curvature while the trailing portion maintains structural simplicity, resolving the contradiction between complex geometry and simple structure
2Ease of manufacture
If conventional straight blades are used, then manufacturing is simple, but air flow generation is insufficient for expelling cut grass
Solution Approach 1:
The blade simultaneously performs cutting and air flow generation functions. The curved leading edge creates slicing action while the overall blade geometry generates ascending air currents that expel cut grass, eliminating the need for separate air generating elements and simplifying the system
3Device complexity
If the blade has limited sharpened portion, then the structure is simple, but the cutting effectiveness is insufficient for tall or wet grass
Solution Approach 1:
The curved leading edge extends the effective cutting surface area, allowing the blade to engage with tall or wet grass more effectively. The curvature distributes the cutting force along the arc, increasing cutting capacity without requiring a larger or more complex blade structure
4Device complexity
If straight blades with small flaps are used, then the design is simple, but the air current generation is insufficient to lift and expel grass
Solution Approach 1:
The curved leading edge acts as an air foil that generates ascending air currents during rotation. This curvature creates aerodynamic lift that effectively lifts and expels cut grass, producing sufficient air flow force without requiring additional complex air generating mechanisms
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
The solution enables clean, uniform cuts with reduced effort and time, significant energy savings, and improved grass collection, maintaining a lush appearance while increasing cutting capacity and reducing emissions.
Implementation Method 1
another trailing edge with a vane or propeller blade shape, with which an air flow is generated to expel the cut grass
Implementation Method 2
cutting is not done by striking as occurs traditionally, but rather the material to be cut is sliced, in other words from one side to the other in one single action, the blade gliding over the lawn or grass to be cut
Data Source
Figure 1~2
AI summary
The invention relates to a blade for cutting grasses in general, consisting of a part (1) which is mounted, via the opening (2), on the driving axle of a cutting or scrub clearing machine, said part including at least two small blades (4), each having a sharp front edge determining the leading or cutting edge (5) that extends outwards in a curved outer section (5'), while opposite the leading edge (5), there is a rear trailing edge (6) in the form of a propeller aileron, for producing an air flow during the rotation, that generates the ejection of the cut material and suction-lifts the material to be cut.