Trimmer Head Pivot Posts Single Line Strip
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Solution Overview
Problem
Fixed-line trimmer heads with pivoting line-holding mechanisms for folded strips of line suffer from increased weight and friction, reducing their ability to pivot effectively due to added components, leading to increased drag and reduced efficiency when cutting vegetation.
Innovation Solution
A fixed-line trimmer head design that holds a single strip of line with a pivoting mechanism where one end extends beyond the periphery to cut vegetation, while the other end is shorter and does not extend beyond the trimmer head, reducing drag and weight by minimizing the number of line ends used for cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If folded strips of line are used with both ends extending beyond the periphery to cut vegetation, then cutting coverage is improved, but line drag increases and pivoting efficiency decreases
Solution Approach 1:
The line-holding mechanism is segmented into multiple independent holders, each capable of holding a single strip of line. This allows selective use of line ends - only those that extend beyond the periphery are used for cutting, while others remain inside and do not contribute to drag. The segmentation enables optimization between cutting coverage and drag reduction.
2Ease of operation
If pivoting mechanisms with added components are used to hold folded strips of line, then pivoting capability is improved, but weight increases and friction increases
Solution Approach 1:
The invention extracts and eliminates unnecessary components from the pivoting mechanism. Instead of using complex mechanisms with multiple parts to hold folded strips, the design uses simple line holders that can pivot freely without added components. This extraction of unnecessary elements reduces weight and friction while maintaining pivoting capability.
Solution Approach 2:
Instead of adding components to enable pivoting, the invention inverts the approach by using a pivot-friendly design where the line holders are positioned and configured to pivot naturally without additional mechanical assistance. The mechanism is designed to pivot easily by its inherent properties rather than through added actuating components.
3Productivity
If both ends of folded strips of line are used for cutting, then vegetation cutting efficiency is improved, but the number of line ends increasing drag
Solution Approach 1:
Different line holders are assigned different functions based on local requirements. Some line holders position their line ends beyond the periphery for active cutting, while others keep their line ends inside the periphery where they do not contribute to drag. This local differentiation optimizes the balance between cutting efficiency and drag reduction.
Data Source
AI summary
A fixed-line trimmer head for a rotary trimmer device includes the upper portion having a periphery, wherein the upper portion has a plurality of openings spaced from the periphery; and a plurality of mechanisms. Each mechanism can hold a strip of line and includes a post portion disposed through one of the openings in the upper portion, and a flange disposed at one end of the post portion and sandwiched between the upper portion and lower portion of the trimmer head to prevent vertical movement of the mechanism. The post portion includes two line channels, each line channel defining a passageway to receive the same strip of line, wherein at least one of the line channels is curved such that any portion of the strip of line being received through the passageway of that line channel is bent at that portion of the strip of line away from the second line channel while passing through that at least one line channel that is curved.