Hollow Fishing Rod Line Control Without a Traditional Reel

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Solution Overview

Problem

Fly fishing and Tenkara fishing methods face challenges with rod and reel weight causing fatigue, and limitations in line length adjustment, making it difficult to handle and retract lines, especially when fishing alone.

Innovation Solution

A fishing rod with a hollow body and a free line cast control and drag mechanism that allows for precise casting and line length adjustment, eliminating the need for a traditional reel by threading the line through the rod body and using a mechanism to apply pressure for control, enabling easy casting and retraction of the line.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a traditional reel and rod combination is used for fly fishing, then the casting function is achieved, but the weight of the reel and rod causes fatigue

Engineering Contradiction:
Improveease of useVSAvoidweight of rod and reel
Core Design Contradiction:
Ease of operationVSWeight of moving object

Solution Approach 1:

The patent removes the traditional reel from the fishing system and integrates only the essential line control function directly into the rod. The rod becomes hollow to accommodate the line running through its interior, eliminating the separate reel component and its associated weight, while preserving the core function of line deployment and retrieval.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The patent combines the line storage, line deployment, and line retrieval functions that were previously separated into distinct components (reel, rod, line) into a single integrated rod structure. The hollow rod body serves as both the structural element and the line conduit, merging multiple functions into one component to reduce overall system weight.

Inventive Principle:
Principle #5Merging (Combining)

2Adaptability or versatility

If Tenkara fishing with a fixed length line is used, then the setup is simple, but the line length cannot be adjusted making it difficult to handle fish without assistance

Engineering Contradiction:
Improveline length adjustmentVSAvoidcomplexity of line handling
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent transforms the fixed line length characteristic of traditional Tenkara fishing into a dynamic, adjustable system. The rod mechanism allows the line length to be changed on-demand by the angler, enabling adaptation to different fishing scenarios such as varying distances to fish or different fish sizes, while maintaining simplicity through direct manual operation.

Inventive Principle:
Principle #15Dynamics

3Length of moving object

If a longer line than the rod length is used in Tenkara fishing, then casting distance is improved, but it becomes very difficult to pull the fish in without walking back or having assistance

Engineering Contradiction:
Improveline lengthVSAvoidease of fish retrieval
Core Design Contradiction:
Length of moving objectVSEase of operation

Solution Approach 1:

The hollow rod structure acts as an intermediary mechanism between the angler and the line. It provides a controlled pathway for the line to pass through, allowing the angler to efficiently retrieve long lines without needing to physically walk back or use assistance. The rod's internal structure facilitates smooth line flow during retrieval.

Inventive Principle:
Principle #24Intermediary (Mediator)

4Device complexity

If a traditional reel is used to control the line, then line management is achieved, but the device complexity and weight increase

Engineering Contradiction:
Improvecomplexity of line control mechanismVSAvoidweight of reel
Core Design Contradiction:
Device complexityVSWeight of moving object

Solution Approach 1:

The patent extracts the essential line control function from the complex reel assembly and implements it in a simplified manner directly within the rod structure. Only the minimum necessary components are retained to control line flow, eliminating unnecessary reel mechanisms while maintaining effective line management.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The rod structure is designed to perform multiple functions: it serves as the structural support, the line conduit, the line storage chamber, and the line control mechanism. This multi-functionality eliminates the need for a separate reel, reducing both device complexity and weight while maintaining line management capabilities.

Inventive Principle:
Principle #6Universality (Multi-functionality)

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

The solution reduces fatigue by eliminating the weight of the reel, allows for precise short to medium distance casting, and enables adjustable line lengths, facilitating solo fishing without assistance, reducing the risk of line and rod damage.

Implementation Method 1

a free line cast control and drag mechanism that applies pressure as needed to the line to control movement of the line through the rod body

Methodology Applied
Scientific EffectFriction: Friction

Data Source

PatentUS12185705B2Cast control and drag mechanism
Publication Date: 2025.01.07 PETROJ FLORIN
  • US12185705B2 patent drawing
  • US12185705B2 patent drawing
  • US12185705B2 patent drawing

AI summary

A fishing rod including a rod body, a free line cast control and drag mechanism operatively connected to a proximal end of the rod body, and a line operatively threaded through the free line cast control and drag mechanism and running through a hollow passageway of the rod body and out a distal end. A method of fishing with the fishing rod by casting the line out of the distal end of the rod body onto a body of water, detecting that a fish is on the line, and pulling the line through the proximal end of the rod body and through the free line cast control and drag mechanism.