Fishing Rod Grip–Reel Seat Ring for Gap Prevention

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Solution Overview

Problem

Fishing rods with low bending rigidity grips tend to curve following the rod, creating gaps between the rigid reel seat and soft grip, leading to moisture ingress and deteriorated hand contact during use.

Innovation Solution

A ring member is attached between the grip and reel seat, with an extension portion on the reel seat protruding axially, overlapping the grip radially, and fixed to prevent gaps by leveraging the reel seat's high bending rigidity to suppress curving.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the grip is made of soft material with low bending rigidity, then hand contact comfort is improved, but a gap is generated between the reel seat and grip when the rod is curved

Engineering Contradiction:

Improvehand contact comfortVSAvoidgap-free connection

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent introduces a ring member as an intermediary component between the reel seat and grip. This ring member is fitted onto an extension portion of the reel seat and abuts against the grip, serving as a mediator that maintains the connection between the rigid reel seat and the soft grip without generating gaps during rod curvature

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent extends the reel seat in the axial direction to create an extension portion that protrudes beyond the original end surface. This dimensional extension allows the ring member to be positioned at a location where it can effectively bridge the gap between the reel seat and grip, particularly at the outer radial position where the grip overlaps the extension

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Strength

If the reel seat is made of hard resin with high bending rigidity, then structural strength is improved, but moisture ingress occurs through gaps when the grip curves

Engineering Contradiction:

Improvereel seat rigidityVSAvoidmoisture ingress

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The ring member acts as a protective intermediary that seals the interface between the reel seat and grip. By being fitted onto the extension portion and abutting the grip, it creates a continuous barrier that prevents moisture from penetrating through gaps that would otherwise form during rod curvature

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The extension portion is pre-formed on the reel seat to protrude in the axial direction, creating a prepared structure that allows the ring member to be fitted and positioned in advance. This preliminary structural preparation ensures that the gap-preventing mechanism is in place before the rod undergoes curvature and potential moisture ingress

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250302021A1Fishing rod

Publication Date: 2025.10.02 DAIWA SEIKO CORPORATION

AI summary

In a fishing rod of the present invention, a grip 20 and a reel seat 10 are disposed adjacent to each other on an outer side of a base rod 2 and a ring member 30 is provided between the grip 20 and the reel seat 10. An extension portion 10a that protrudes in an axial direction is provided on an end surface of the reel seat 10, the end surface being adjacent to the grip 20, and a part of the grip 20 overlaps the extension portion 10a at an outer position in a radial direction, and the ring member 30 is interposed and fixed between the reel seat 10 and a part of the grip 20 on the extension portion 10a.