Grass Trimmer Line with Distinctive Center Marks for Alignment
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Solution Overview
Problem
Current grass trimmer lines require manual adjustment to ensure equal lengths on both sides of the trimmer head, wasting user time and reducing efficiency.
Innovation Solution
A grass trimmer line design featuring two line bodies with equal lengths, distinct features (such as color, pattern, material, or shape), and a connecting portion to facilitate easy alignment with the trimmer head, allowing for quick identification of the midpoint and improved winding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual adjustment is used to align the center point of the grass trimmer line with the center axis of the grass trimmer head, then the trimming efficiency can be ensured, but the user's working time is wasted and working efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by pre-marking the center points on both line bodies before the user receives the product. The first center mark is located on the first line body at a distance of L1 from the first non-free end, and the second center mark is located on the second line body at a distance of L2 from the second non-free end, where L1 and L2 are calculated based on the line body lengths and the required overhang. This pre-positioning eliminates the need for users to perform complex measurements and adjustments during installation, directly resolving the contradiction between alignment precision and adjustment time.
Solution Approach 2:
The patent replaces the mechanical measurement and adjustment system with a visual marking system. Instead of requiring users to measure distances and calculate center points using tools, the invention uses visually identifiable center marks (which can be colored, textured, or shaped differently from the rest of the line body) to indicate the exact center positions. This substitution transforms a complex mechanical adjustment task into a simple visual alignment task, significantly reducing adjustment time while maintaining precision.
2Ease of operation
If a single design grass trimmer line is used, then the structure is simple, but the user cannot quickly identify the midpoint and must perform manual adjustment
Solution Approach 1:
The patent applies color changes by using different colors for the first center mark and second center mark compared to the main line body, or using different colors for the two line bodies themselves. For example, the first line body can be colored red and the second line body blue, with their respective center marks clearly visible in their own colors or in a contrasting color. This color differentiation makes it extremely easy for users to identify the center points and distinguish between the two line bodies, greatly improving alignment ease without adding mechanical complexity.
Solution Approach 2:
The patent applies asymmetry by making the center marks asymmetric or distinct from the uniform structure of the line bodies. The center marks can be designed with different shapes, sizes, or textures than the main line body, creating visual asymmetry that draws attention to these critical points. This asymmetric design allows users to quickly locate and identify the center marks among the uniform line structure, improving ease of operation while maintaining overall structural simplicity.
Data Source
AI summary
A grass trimmer line includes a first line body having a first free end and a first non-free end and a second line body having a second free end and a second non-free end. A length of the second line body is substantially equal to a length of the first line body. The first line body has a first feature, the second line body has a second feature corresponding to the first feature, and the second feature is different from the first feature. A connecting portion is configured to connect the first non-free end of the first line body and the second non-free end of the second line body so that the first line body and the second line body are connected into the complete grass trimmer line.