Rotatable Eyelet Fishing Gaff Hook Leverage

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Solution Overview

Problem

Conventional fishing gaff hooks lack the mechanical advantage and flexibility to securely engage and hoist large and difficult-to-handle fish out of the water without causing damage or disengagement.

Innovation Solution

A fishing gaff hook with a cylindrical body, a terminal barb for initial penetration, a fixed engagement with a rod, and a rotatable eyelet that allows for maximum leverage and secure attachment, enabling efficient hoisting and removal of large fish.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a conventional gaff hook with a stiff handle and fixed hook is used, then the device provides structural strength for pulling fish, but it lacks flexibility and mechanical advantage for securely engaging large fish

Engineering Contradiction:

Improvestructural strengthVSAvoidflexibility and mechanical advantage

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent applies the dynamics principle by making the eyelet rotatable on the cylindrical body, allowing the gaff hook to adapt to different fish positions and angles during hoisting. This rotational freedom provides mechanical advantage and flexibility while maintaining the overall structural strength of the device.

Inventive Principle:

Principle #15Dynamics

2Device complexity

If a fixed eyelet is used on the gaff hook, then the structure is simple, but it causes twisting and disengagement when handling large fish

Engineering Contradiction:

Improvestructure simplicityVSAvoidsecure attachment

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The eyelet is designed to rotate freely on the cylindrical body, transforming the fixed structure into a dynamic one. This rotation prevents twisting forces from causing disengagement while maintaining relatively simple construction through the use of a sleeve and bushings.

Inventive Principle:

Principle #15Dynamics

3Volume of moving object

If the bushings are spaced closer together, then the eyelet body is more compact, but the sleeve cannot be properly positioned intermediate the bushings

Engineering Contradiction:

Improveeyelet body compactnessVSAvoidsleeve positioning accuracy

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The patent specifies that the bushings are spaced apart by at least W1 (the width of the sleeve), ensuring proper positioning. This parameter relationship guarantees that the sleeve can be correctly positioned intermediate the bushings while maintaining manufacturing precision.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11510402B2Fishing gaff hook

Publication Date: 2022.11.29 WINTHROP TACKLE

AI summary

A fishing gaff hook including a rotatable eyelet.