Fishing Rod Automatic Hooking Device with Preloaded Spring

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Solution Overview

Problem

Existing fishing devices require manual tugging on the fishing rod to hook a fish, which can fail due to skill issues or delayed response, and the force is attenuated over distance, leading to ineffective hooking.

Innovation Solution

An automatic strike device mounted on the fishing line with a spring mechanism that triggers instantly when a fish takes the bait, ensuring an energetic and instantaneous pull on the hook, with water-soluble locking to prevent premature release.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual tugging is used to hook a fish, then the angler can control the strike, but the response time is delayed and skill-dependent

Engineering Contradiction:
Improvehooking reliabilityVSAvoidresponse time
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The spring mechanism is pre-loaded before casting, storing elastic energy in advance. When the fish takes the bait and triggers the release mechanism, the pre-loaded spring immediately delivers the striking force without requiring the angler to react, thus eliminating response time delay while maintaining reliable hooking.

Inventive Principle:
Principle #10Preliminary action

2Length of moving object

If the device is placed at a distance of 4 to 10 meters from the hook, then casting range is improved, but the tugging force is considerably attenuated

Engineering Contradiction:
Improvecasting rangeVSAvoidtugging force
Core Design Contradiction:
Length of moving objectVSForce

Solution Approach 1:

The spring acts as an intermediary force transmission mechanism between the device and the hook. Instead of relying on direct line tension over long distances, the spring stores and releases elastic energy locally at the device position, delivering full striking force to the hook regardless of the 4-10 meter casting distance, thus preventing force attenuation.

Inventive Principle:
Principle #24Intermediary (Mediator)

3Speed

If the spring is loaded before casting, then the device is ready to strike instantly, but the side pin may be accidentally disengaged during casting

Engineering Contradiction:
Improvestrike speedVSAvoidpremature release prevention
Core Design Contradiction:
SpeedVSReliability

Solution Approach 1:

The locking mechanism uses water-soluble material that changes its physical properties based on the environmental parameter (presence of water). Before casting (in air), the water-soluble material maintains a locked state preventing accidental disengagement. After casting (in water), the material dissolves, allowing the spring to be freely triggered by the fish taking the bait, thus enabling instant strike while preventing premature release.

Inventive Principle:
Principle #35Parameter changes

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 device ensures reliable and efficient automatic hooking of fish, maintaining force and reducing manual errors, suitable for various fishing techniques and conditions.

Implementation Method 1

an elastic element (22) arranged in said casing (10)... said elastic element (22) being suitable for being alternately disposed in an extended position... and in a retracted position

Methodology Applied
Scientific EffectElasticity: Elasticity

Implementation Method 2

said device further comprises water-soluble locking means (Q1, Q2) arranged in said device (1) and suitable for locking said anchor (24; 24, 240) in said operating position... said water-soluble locking means (Q1, Q2) tending to dissolve as soon as said device (1) is submerged in water

Methodology Applied
Scientific EffectHydrolysis: Hydrolysis

Data Source

PatentEP4238414B1Device used with a fishing rod for automatic hooking of a striking fish
Publication Date: 2025.10.08 CALICCHIA MASSIMO
  • EP4238414B1 patent drawingFigure 1
  • EP4238414B1 patent drawingFigure 2
  • EP4238414B1 patent drawingFigure 3

AI summary

A device (1) for use on fishing rods to obtain the automatic strike of the fish; the device (1) comprises a tubular casing (10) comprising an axial duct, an actuator (20) comprising an elastic element (22) disposed in said tubular casing (10), at least one anchor (24; 24', 240) connected to the elastic element (22), stopping means (P2) suitable for stopping said anchor (24; 24', 240) in a front end-of-travel position, when the elastic element (22) is in extended condition; a thread (23) connected to a hook (A) and to said anchor (24, 24'; 240), in such a way that, following to a traction exerted on the thread (23) by the fish that has taken the hook, said anchor (24; 24', 240) is disengaged from said stopping means (P2).