Anti-Loosening Plug for Fishing Reel Handle Shaft

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Fishing reel handle nuts loosen or handle shafts break when a load is applied during line winding due to gaps between the handle nut and flat portions of the handle shaft, even with anti-idling features like U-cutting or side-cutting.

Innovation Solution

An anti-loosening plug with sub-male threaded portions is fitted on the handle shaft's first flat portions, which correspond to male threaded portions, and includes filler portions and a bridge to fill gaps and prevent vibration, along with a positioning mechanism for convenient assembly and maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a handle nut is fixed on a handle shaft with an anti-idling flat portion formed by U-cutting or side-cutting, then the handle arm is prevented from idling, but the handle nut loosens or the handle shaft breaks when a load is applied due to a gap between the handle nut and the flat portion

Engineering Contradiction:

Improveanti-idling functionVSAvoidhandle nut fixation

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

An anti-loosening plug is introduced as an intermediary component between the handle shaft and the handle nut. The plug fills the gap between the flat portion of the handle shaft and the handle nut, preventing relative movement and eliminating the loosening mechanism while maintaining the anti-idling function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The handle assembly is segmented into distinct components: the handle shaft with anti-idling flat portion, the anti-loosening plug that fills the gap, and the handle nut. This segmentation allows each component to perform its specific function independently, with the plug addressing the gap issue without interfering with the anti-idling mechanism.

Inventive Principle:

Principle #1Segmentation

2Reliability

If additional tightening or tension is applied to prevent loosening, then the anti-loosening effect is improved, but the device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveanti-loosening effectVSAvoidfastening structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The anti-loosening plug is designed as a simple, inexpensive component that can be easily manufactured and replaced if necessary. Rather than using complex adjustable fastening mechanisms, a straightforward plug structure provides reliable anti-loosening functionality at low cost and simplicity.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS10004215B2Fishing reel equipped with anti-loosening handle

Publication Date: 2018.06.26 DOYO ENG

AI summary

Provided is a fishing reel equipped with an anti-loosening handle. The fishing reel includes an anti-loosening plug that is fitted on first flat portions of a handle shaft and has sub-male threaded portions corresponding to first male threaded portions in order to solve a problem that a handle nut is loosened or a handle shaft is broken when a load is applied to a handle arm in a process of winding a fishing line due to a gap between the handle nut and a flat portion of a handle shaft even though the handle nut is fixed in common handle shafts having an anti-idling flat portion at an end which is formed by U-cutting or side-cutting to couple the handle arm without idling.