Multi-Plane Brush Cutter Head for Low-Vibration Mulching
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Solution Overview
Problem
Existing cutting tools for brush cutters, such as filaments, blades, and metal discs, suffer from issues like abrasion, breakage, high energy consumption, noise, safety hazards, and complex designs, limiting their effectiveness and safety for professional use, especially in mulching applications.
Innovation Solution
A cutting head design featuring planar, freely rotatable cutting discs arranged in multiple planes, which absorb impacts and distribute cutting forces to minimize energy consumption and vibration, while providing a mulching function by cutting vegetation into small pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cutting filaments are used, then the cutting head can cut grass and edging, but the filaments are prone to abrasion or breakage requiring frequent changes
Solution Approach 1:
The cutting head is divided into multiple independent cutting elements (multiple filaments arranged in a star pattern) that can operate independently. This segmentation allows the system to maintain cutting functionality even when individual filaments wear or break, and simplifies replacement as individual filaments can be replaced without replacing the entire cutting head assembly
Solution Approach 2:
The patent changes the material parameters of the cutting filaments by using high-strength, abrasion-resistant materials with optimized diameter and tensile strength properties. The filaments are designed with specific mechanical properties (tensile strength, elasticity modulus) that balance durability, flexibility, and cutting efficiency, resolving the contradiction between ease of replacement and reliability
2Strength
If large diameter filaments are used, then cutting capability is improved, but energy consumption increases
Solution Approach 1:
Instead of using a single large-diameter filament, the patent segments the cutting function into multiple smaller-diameter filaments arranged in a star pattern. This distribution of cutting function across multiple elements reduces the diameter requirement for each individual filament while maintaining overall cutting capability, thereby reducing energy consumption
Solution Approach 2:
The patent transitions from a single-point cutting approach to a multi-point cutting approach by arranging filaments in a star pattern across different radial positions. This dimensional arrangement allows smaller filaments to collectively achieve the cutting power of a single large filament, reducing energy consumption while maintaining cutting strength
3Adaptability or versatility
If flexible filaments are used, then the filament can adapt to cutting surfaces, but the filament tends to slam during rotation generating noise
Solution Approach 1:
The cutting head uses multiple thin filaments instead of a single thick filament. This segmentation reduces the mass of each individual filament, thereby reducing the impact force and noise generated during rotation while maintaining flexibility for adapting to cutting surfaces
Solution Approach 2:
The patent optimizes the physical parameters of the filaments, including diameter, material density, and tensile strength, to achieve an optimal balance between flexibility and noise reduction. The filaments are designed with specific dimensional parameters that minimize slamming noise while maintaining the flexibility needed for effective cutting
4Strength
If plastic cutting blades are used, then dense or hard vegetation can be cut, but the blade can break into pieces following impact on hard obstacles
Solution Approach 1:
Instead of using a single solid plastic blade, the patent segments the cutting function into multiple thin filaments. This segmentation ensures that if one filament breaks, the others continue to function, and the broken pieces are smaller and less likely to cause injury. The star pattern arrangement distributes the cutting force across multiple elements
Solution Approach 2:
The patent uses thin, flexible filament structures instead of rigid solid blades. These thin filaments can bend and deform upon impact with hard obstacles, absorbing impact energy and reducing the likelihood of breaking into dangerous pieces while maintaining cutting effectiveness for dense vegetation
5Strength
If metal discs are used, then cutting of dense or dry vegetation is effective, but sparks are generated resulting from contact with stone
Solution Approach 1:
The patent changes the material parameter from metal to non-metallic, non-sparking materials such as high-strength plastic or composite materials. This material substitution eliminates spark generation and fire risk while maintaining cutting effectiveness through optimized filament design, multiple cutting points, and appropriate material hardness
Solution Approach 2:
The patent employs composite materials that combine the advantages of different materials - the strength and durability needed for cutting dense vegetation with the non-sparking, safe properties of non-metallic materials. These composite filaments achieve both cutting effectiveness and safety by integrating multiple material properties
6Productivity
If multiple cutting elements are added to provide mulching function, then vegetation can be cut into small pieces, but device complexity increases
Solution Approach 1:
The patent uses multiple cutting filaments arranged in a star pattern, where each filament acts as an independent cutting element. This segmentation provides the mulching function by creating multiple cutting points that chop vegetation into small pieces, while the modular filament design keeps the overall system relatively simple and easy to manufacture
Solution Approach 2:
The same multi-filament star pattern cutting head design serves multiple functions: it provides both the cutting function and the mulching function simultaneously. The multiple filaments create multiple cutting points that chop vegetation into small pieces for mulching, eliminating the need for separate collection operations while maintaining a relatively simple device structure
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A head 1 for brush cutter suitable for cutting grass and herbaceous plants having a support element 2, rotatable about a vertical axis Y-Y thereof, connected to a series of first pins 3 and a series of second pins 4. The series of first pins 3 is coupled to a first plurality of cutting elements 5 and the series of second pins 4 is coupled to a second plurality of cutting elements 6. Said first plurality of cutting elements 5 defines a cutting plane P1 and said second plurality of cutting elements defines a second cutting plane P2, spaced apart from the previous one. The first and second plurality of cutting elements 5, 6 having, over an angular sector of 360°, an alternating arrangement.