Spool Assembly Fishing Line Entry Prevention
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Solution Overview
Problem
Conventional spool assemblies for dual-bearing reels allow slack fishing line to easily move axially outward and enter between flange portions and side plates, leading to line crossover and entanglement issues.
Innovation Solution
The spool assembly features fishing line entry prevention portions that project substantially perpendicular from the cylindrical portions of the flange, restricting axial movement and preventing line entry between flange and side plate interfaces, with optimized dimensions and geometries to enhance line retention and reduce entanglement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protrusions are formed on the outer periphery of slanted flange portions, then fishing line contact is increased, but fishing line can easily move axially outward and enter between flange portions and side plates
Solution Approach 1:
The flange portion is segmented into two functional zones: a slanted outer peripheral portion for line contact and a cylindrical inner portion with perpendicular protrusions for line restriction. This segmentation allows each zone to perform its specific function optimally without interference.
Solution Approach 2:
Different regions of the flange portion are given different geometries: the outer peripheral region has a slanted surface to guide line contact, while the inner cylindrical region has perpendicular protrusions to restrict axial movement. Each local region is optimized for its specific purpose.
2Reliability
If protrusions are arranged perpendicular to the rotational axis on slanted flange portions, then the side surfaces intersect at an obtuse angle, but fishing line can still move outward and enter between flange portions and side plates
Solution Approach 1:
Instead of arranging protrusions perpendicular to the rotational axis on the slanted outer periphery, the invention inverts the approach by placing perpendicular protrusions on the cylindrical inner portion of the flange, where perpendicular orientation effectively blocks line movement.
3Reliability
If the spool assembly prevents line entry effectively, then line entanglement is reduced, but the structure becomes more complex
Solution Approach 1:
The invention merges the line guidance function and line restriction function into a single integrated flange structure, eliminating the need for separate components. The flange itself is shaped to perform both functions.
Solution Approach 2:
The flange portion is designed with multi-functionality: the slanted outer peripheral portion handles line contact and guidance, while the cylindrical inner portion with perpendicular protrusions handles line restriction. One component performs multiple essential functions.
Data Source
AI summary
A spool assembly for a dual bearing reel includes a tubular bobbin, first and second flange portions, first and second annular portions, and first and second fishing line entry prevention portions. The first and second flange portions project radially outward from opposite ends of the bobbin. Inner peripheries of the first and second annular portions cover the first and second flange portions. The first and second fishing line entry prevention portions project from outer peripheries of the first second flange portions. The first and second fishing line entry prevention portions are provided across a slight gap between tip portions of the first and second annular portions. The first and second fishing line entry prevention portions prevent fishing line from entering between the first flange portion and a first side plate and between the second flange portion and the second side plate.