Grass Cutting Head Spool Flange with Openings for Line Insertion
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Solution Overview
Problem
Existing grass cutting heads require complex and time-consuming processes for replacing cutting line lengths, often necessitating the opening of the housing and use of guiding elements, which complicates the operation and increases manufacturing difficulties due to the need for complex spool shapes.
Innovation Solution
A grass cutting head design featuring a housing with perimeter wall holes and a spool flange with openings that allow the cutting line to be inserted transversally without opening the housing, facilitating the winding of new line lengths by passing through the holes and flange openings, enabling easier line replacement and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the housing is opened to replace the cutting line, then the cutting line can be replaced, but the operation becomes time-consuming and complex
Solution Approach 1:
The spool flange is segmented with multiple openings distributed around its perimeter, allowing the cutting line to be inserted through any of these openings without requiring the housing to be opened. This segmentation enables independent access to the spool interior through the flange structure itself.
Solution Approach 2:
The cutting line replacement operation is extracted from the housing opening process. Instead of requiring the housing to be opened, the line is inserted directly through the spool flange openings, separating the line replacement function from the housing assembly/disassembly process.
2Ease of operation
If a guiding element is used to insert the cutting line, then the line can pass through aligned holes, but the device complexity increases
Solution Approach 1:
The guiding element is extracted from the system entirely. The spool flange openings themselves serve as the guidance mechanism, eliminating the need for separate guiding tubes or elements. The line is guided directly by the geometry of the flange openings and the spool interior space.
Solution Approach 2:
The spool flange serves multiple functions: it provides structural support for the spool, creates the winding chamber with the axial body, and simultaneously provides the insertion openings for the cutting line. This multi-functionality eliminates the need for separate guiding elements.
3Ease of operation
If the spool has a complex shape with curved guiding channels, then the line can be guided through the head, but the manufacturing precision and ease of manufacture deteriorate
Solution Approach 1:
The spool flange is segmented with multiple discrete openings rather than requiring continuous curved guiding channels. This segmentation allows the line to be inserted through any opening and guided along a straight path, avoiding the need for complex curved internal geometries in the spool structure.
Solution Approach 2:
Instead of providing guiding channels within the spool body, the guidance function is inverted to the flange perimeter where simple openings are provided. The line guidance is achieved by the external geometry of the flange openings rather than internal curved channels, simplifying the spool manufacturing process.
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
This design simplifies the cutting line replacement process, reducing operational complexity and manufacturing challenges by allowing line insertion and winding without opening the housing, thus improving user experience and manufacturing efficiency.
Implementation Method 1
In use, the grass cutting head is quickly rotated around the rotation axis thereof and the line portions projecting from the housing of the spool are tensioned due to the centrifugal effect and act on the vegetation, cutting it.
Data Source
AI summary
The grass cutting head (1) comprises a housing (3), inside which a spool (11) is provided to wind the cutting line (F). The housing has holes (9) for the passage of the cutting line (F) towards the outside of the housing. The spool (11) has at least a flange (15) with openings (31) allowing to insert the cutting line (F) into a passage defined between the flange (15) and a transverse wall (3B) of the housing.