Segmented Grass-Cutting Head for Reliable Line Replacement
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Solution Overview
Problem
Existing axial rotation grass-cutting heads for brushcutters with replaceable cutting lines are structurally complex, leading to increased production costs and operational unreliability.
Innovation Solution
A grass-cutting head design comprising an upper body, a lower body, and an intermediate body that form channels for housing a single cutting line, with end openings on the side face, allowing for easy replacement and alignment of the line without undercuts, reducing structural complexity and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple single pieces of line are inserted into the head with complex construction solutions, then the cutting function is achieved, but the structural complexity increases and production costs rise
Solution Approach 1:
The head is divided into an upper body and a lower body that define separate channels for the cutting line. This segmentation allows each body to be simpler in structure while collectively achieving the required function, reducing overall structural complexity compared to integrated complex solutions.
Solution Approach 2:
The cutting line is extracted as a separate replaceable element from the head structure. The line can be independently removed and replaced without disassembling the head bodies, simplifying the head construction while maintaining operational reliability through easy line replacement.
2Reliability
If complex head construction solutions are used to house cutting line, then the cutting line can be retained, but production costs increase
Solution Approach 1:
The channel housing for the cutting line is segmented into portions defined by the upper body and lower body respectively. This allows for simpler, more cost-effective manufacturing of each body component while collectively providing secure line retention through the combined channel structure.
Solution Approach 2:
The upper body and lower body are combined to form the complete channel structure that retains the cutting line. This merging of two simpler components achieves the same line retention function as a single complex component would, but at lower production cost.
3Reliability
If cutting line replacement requires complex disassembly, then line retention is secure, but line replacement becomes difficult
Solution Approach 1:
The cutting line is designed to be extractable from the channel formed by the upper and lower bodies. The line can be removed by simply pulling it out from the channel openings without disassembling the head bodies, enabling easy replacement while the channel structure maintains secure line retention during operation.
Solution Approach 2:
The channel structure is pre-configured in the upper and lower bodies to allow straightforward line insertion and removal. The line can be preliminarily positioned and secured in the channel without requiring complex assembly steps, facilitating easy user replacement while maintaining operational security.
Data Source
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AI summary
An axial rotation grass-cutting head, comprising for at least one portion thereof, an upper body (11, 211, 311, 411, 511, 611), a lower body (12, 112, 212, 312, 412, 512, 612) and at least one intermediate body (14, 214, 314, 414, 514, 614) arranged between said upper and lower body, said upper, lower and intermediate bodies defining, when coupled, two channels (15, 16, 215, 216, 315', 316', 415, 416, 515', 516', 615, 616) for housing a single cutting line (17, 217, 317, 417, 517, 617), having respective end openings on the side face of the head.