Spinning Reel Spool Front-Flange Structure for Slack-Line Retention
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Solution Overview
Problem
Fishing line wound in a slack state can cause backlash when cast, leading to entanglement over the spool's front flange.
Innovation Solution
A spool design with a second wall portion extending radially outward and potentially inclined inward to retain slack fishing line, preventing it from riding over the first annular portion during casting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the fishing line is wound around the spool in a slack state, then the spool can accommodate more line, but the slack portion can be released and ride over the front flange causing backlash
Solution Approach 1:
The front flange is divided into multiple functional portions: a first annular portion for line winding, a second wall portion to retain slack line, and a first inclined surface for controlled line release. This segmentation allows each portion to perform its specific function, preventing backlash while accommodating slack line.
Solution Approach 2:
The second wall portion acts as an intermediary structure between the slack line and the first annular portion. It retains the slack line in a controlled manner, preventing it from riding over the front flange during casting, thus eliminating backlash without compromising line capacity.
2Object-generated harmful factors
If an inclined surface is provided on the front flange to control line release, then backlash is prevented, but the structure becomes more complex
Solution Approach 1:
The first inclined surface is merged with the first annular portion of the front flange, forming an integrated structure. This combination allows the inclined surface to function as part of the line winding system, providing controlled line release without requiring a separate, complex mechanism.
Solution Approach 2:
The front flange is designed as a multi-functional component: the first annular portion handles line winding, the second wall portion retains slack line, and the first inclined surface controls line release. This multi-functionality reduces the need for additional separate components, simplifying the overall spool structure.
3Object-generated harmful factors
If the second wall portion extends flat radially outward, then it effectively retains slack line, but the axial space utilization is reduced
Solution Approach 1:
The second wall portion is designed with specific local properties: it extends radially outward from the first annular portion and includes a retaining surface that faces the slack line. This localized structure provides effective slack line retention while minimizing impact on overall axial space utilization.
Data Source
AI summary
A spool for a spinning reel, includes a bobbin trunk and a front flange. The bobbin trunk has a front end and extends in an axial direction. The front flange is disposed on the front end of the bobbin trunk in the axial direction. The front flange includes a first wall portion disposed on an outer peripheral side of the bobbin trunk and extending radially outward, a first annular portion disposed further forward in the axial direction than an outermost diameter portion of the first wall portion and extending forward in the axial direction, and a second wall portion disposed on an outer peripheral side of the first annular portion and extending radially outward.