Perpendicular Lawnmower Blade Holder Reduces Rotational Inertia
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Solution Overview
Problem
Conventional lawnmower blades are ineffective at cutting wet, tall, or thick grass, leading to increased resistance, blade wear, and cellular damage, and multiple blade designs with hubs face issues of space constraints and alignment problems.
Innovation Solution
A cutting blade assembly with two blades held in perpendicular orientation by a holder that does not occupy space on the shaft, reducing rotational inertia and stress on the blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a mounting hub is used to hold multiple cutting blades, then the cutting effectiveness on wet, tall, or thick grass is improved, but the device occupies space on the blade mounting shaft and increases rotational mass
Solution Approach 1:
The holder extends perpendicular to the mounting shaft rather than along the shaft axis, utilizing the radial dimension to mount blades. This allows multiple blades to be positioned in different radial directions without occupying axial space on the shaft, resolving the contradiction between cutting effectiveness and shaft space utilization.
2Productivity
If a mounting hub is used to hold multiple cutting blades, then the cutting effectiveness on wet, tall, or thick grass is improved, but the rotational mass increases causing flywheel effect and blade bending
Solution Approach 1:
The holder is divided into multiple arms extending radially from the shaft, with each arm supporting a blade. This segmentation distributes the rotational mass across lighter, separated components rather than concentrating it in a single heavy hub, reducing the overall rotational inertia while maintaining multiple cutting edges for improved productivity.
3Productivity
If a mounting hub is used to hold multiple cutting blades, then the cutting effectiveness is improved, but the clamping force is lost over time causing blades to tilt or come out of alignment
Solution Approach 1:
The holder includes pre-formed recesses or mounting features that precisely position the blades in the correct orientation before operation. This preliminary positioning ensures proper alignment is established during assembly and maintained during use, preventing tilting or misalignment that would occur with conventional hub designs relying solely on clamping force.
Data Source
AI summary
A cutting blade assembly incorporating two lawnmower cutting blades and a holder configured to hold the lawnmower cutting blades in perpendicular orientation with respect to each other. The holder does not occupy any space on the lawnmower blade mounting shaft and results in less rotational inertia than conventional mounting hub designs.