Fishing Rod Fitting Mounting Using Segmented Resin Layers
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Solution Overview
Problem
Conventional methods for mounting fittings on fishing rods using prepreg sheets result in inadequate fixing strength and stress concentration, leading to potential damage and compromised appearance quality due to resin loss and voids.
Innovation Solution
A method involving a first and second fiber-reinforced resin layer, where the first layer is formed from a prepreg sheet with organic fibers and a high epoxy resin content, and the second layer from a prepreg sheet with carbon or glass fibers, ensuring robust fixation and minimizing resin loss by filling gaps with the first layer's matrix resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a trapezoidal prepreg sheet is used to form a curved fiber-reinforced resin layer, then the outer peripheral surface becomes smooth and stress concentrations are prevented, but the thickness at the tip end of the fitting foot becomes too small to provide sufficient fixing strength
Solution Approach 1:
The fiber-reinforced resin layer is divided into two distinct layers: a first layer formed from a trapezoidal prepreg sheet that provides the smooth curved surface, and a second layer formed from a rectangular prepreg sheet that provides uniform thickness and sufficient fixing strength. This segmentation allows each layer to fulfill its specific function without compromise.
Solution Approach 2:
The invention uses a composite structure of two different fiber-reinforced resin layers with different geometric characteristics. The first layer (trapezoidal) and second layer (rectangular) are combined to create a mounting structure that simultaneously achieves smooth surface finish and adequate fixing strength at the fitting foot tip.
2Strength
If a rectangular prepreg sheet is used to form a fiber-reinforced resin layer, then uniform thickness is achieved providing considerable fixing strength, but the layer exerts significant influence on the bending profile of the rod body
Solution Approach 1:
The mounting structure is segmented into two layers where the first layer (trapezoidal) is positioned closer to the rod body and the second layer (rectangular) is positioned outward. This segmentation allows the first layer to have minimal influence on bending while the second layer provides the necessary fixing strength.
Solution Approach 2:
The first prepreg sheet is designed with a trapezoidal shape that creates a curved fiber-reinforced resin layer with locally varied thickness - thinner at the outer peripheral surface and thicker near the rod body - thereby minimizing its influence on the rod body's bending profile while still providing adequate local support.
3Device complexity
If a single fiber-reinforced resin layer is used to mount fittings, then the structure is simple, but resin loss and voids occur leading to poor appearance quality and reduced reliability
Solution Approach 1:
The mounting structure is divided into two sequential layers formed from separate prepreg sheets. This segmentation allows the first layer to be optimized for surface quality (trapezoidal shape with curved outer surface) while the second layer is optimized for structural integrity (rectangular shape with uniform thickness), thereby eliminating resin loss and voids that would compromise appearance and reliability.
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
This approach enhances the fixing strength of fittings on fishing rods, reduces stress concentrations, and improves appearance quality by preventing resin loss and voids, ensuring durable and aesthetically pleasing results.
Implementation Method 1
the matrix resin of the prepreg sheet wrapped around the rod body is cured
Implementation Method 2
the first matrix resin becomes flowable and then cures to form a first fiber-reinforced resin layer
Implementation Method 3
the second matrix resin becomes flowable and then cures to form a second fiber-reinforced resin layer provided on an outer side of the first fiber-reinforced resin layer
Data Source
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AI summary
A fishing rod according to one embodiment includes a rod body extending in a frontand-back direction along a central axis, a fitting having a mounting part, where the mounting part is mounted on an outer peripheral surface of the rod body at a first position determined in a circumferential direction around the central axis, and a fiber-reinforced resin layer surrounding the rod body so as to cover the mounting part. The fiber-reinforced resin layer has a first portion covering the rod body along an entire length thereof in the circumferential direction around the central axis and a second portion extending in the axial direction backward from an axially back end of the first portion and extending in the circumferential direction less than 180° clockwise from the first position and also less than 180° anti-clockwise from the first position.