Pivoting Nylon Cutting Elements for Garden Trimmer Head
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Solution Overview
Problem
Garden trimmers experience frequent cord breakage at the head exit due to fatigue from continuous and irregular flexing, leading to increased noise and power consumption, and difficulties in cord replacement and mounting.
Innovation Solution
A cutting structure with pivoting, flexible cutting elements made of elastic plastic material, such as nylon, that are securely attached to the trimmer head using a locking pin system, allowing for easy replacement and reducing noise and breakage by distributing cutting forces and allowing for precise cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the cord is rigidly fixed by compression to increase working life, then the cord pieces tend to break close to the ring nut due to concentrated cutting forces
Solution Approach 1:
The cutting element is designed to pivot on a pin, transforming from a rigid fixed structure to a dynamic pivoting structure. This allows the cutting element to rotate and absorb cutting forces through pivoting motion rather than rigid compression, preventing breakage at the fixation point while maintaining secure attachment during operation
Solution Approach 2:
The cutting element changes its physical state from rigid to flexible by using elastic plastic material. This parameter change allows the element to deform elastically under cutting forces, distributing stress away from the fixation point and preventing concentrated stress-induced breakage
2Duration of action of moving object
If the cord pieces have round or square cross-sections of considerable dimensions to increase working life, then noise and absorbed power increase considerably
Solution Approach 1:
The cutting element uses a thin flexible strip of elastic plastic material instead of thick rigid cord pieces. This flexible thin-film structure significantly reduces noise and power absorption during operation while maintaining sufficient working life through elastic deformation and pivoting capability
Solution Approach 2:
The cutting element changes from thick rigid cross-section to thin flexible cross-section, fundamentally altering the physical parameters. This parameter change reduces aerodynamic drag, noise, and power consumption while the elastic properties compensate for the reduced dimensions through energy absorption during deformation
3Ease of operation
If the cord pieces are rigidly fixed to simplify mounting, then the cord pieces are rather laborious to mount requiring a tool to release the fixing nut
Solution Approach 1:
The cutting element is segmented into a modular design with a distinct body and mounting interface. The body can be independently inserted and secured by simply pushing it onto the pin, separating the mounting operation from the securing mechanism and enabling tool-free installation while maintaining secure fixation
Solution Approach 2:
The cutting element features self-securing through elastic deformation. When pushed onto the pin, the elastic material deforms and then springs back to lock the element in place automatically, eliminating the need for external tools or complex fixing mechanisms for both installation and replacement
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 significantly reduces cord breakage, simplifies replacement, minimizes noise, and enhances cutting quality by using flexible cutting elements that pivot and compress during operation, reducing the risk of breakage and improving precision.
Implementation Method 1
The body 11 and the cutting element 12 are moulded in one piece from plastic material such as nylon; they also present elastic characteristics which enable them to bend
Data Source
AI summary
The cutting element structure for a garden trimmer comprises one or more elongate cutting elements which at one of their ends present a body pivotable to the trimmer head.