Fishing rod manufacturing method and fishing rod

The fishing rod design with a helical step portion on the inner surface of the large diameter rod tube addresses the complexity and quality variation issues in conventional manufacturing, ensuring smooth operation and reduced damage, while the manufacturing method using a stepped core metal and resin film facilitates the formation of this design.

JP7649643B2Active Publication Date: 2025-03-21SHIMANO INC
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Patent Information

Application Number
JP2020207377
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2020-12-15
Publication Date
2025-03-21
Estimated Expiration
2040-12-15

AI Technical Summary

Technical Problem

The conventional method of manufacturing fishing rods with spiral projections on the inner surface of the rod body is complex and prone to variations in quality, and the protrusions are susceptible to damage during use and storage.

Method used

The fishing rod design features a tapered portion with a helical step portion on the inner surface of the large diameter rod tube, allowing for smooth fixation and release without damaging the rod body, and a manufacturing method using a stepped core metal and resin film to form the spiral step portion.

Benefits of technology

This design reduces variations in quality during manufacturing, ensures smooth engagement and disengagement of the rod tubes without damage, and prevents foreign matter from getting caught between the rod tubes, enhancing the durability and usability of the fishing rod.

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Abstract

To provide a fishing rod capable of reducing variations of quality in production, and smoothly fastening and releasing without breakage of a rod body, and a production method of a fishing rod.SOLUTION: A fishing rod is configured so that a front end inner peripheral face 2a of a large diameter rod pipe 2 and a rear end outer peripheral face 3a of a small diameter rod pipe 3 are joined so as to be fitted freely, and on the front end inner peripheral face 2a of the large diameter rod pipe 2, a female taper part 21 being inclined to a rod shaft O of the large diameter rod pipe 2, is provided, and step parts 22 formed into a spiral shape along an inner peripheral face of the female taper part 21 are provided. The step part 22 has: a first step face 22A which is directed to a rear end side of the large diameter rod pipe 2 and extends in a direction crossing the rod shaft O of the large diameter rod pipe 2; and a second step face 22B which is directed to the rod shaft O and extends in a rear end side from an outer peripheral end of the first step face 22A. In a cross sectional shape including the rod shaft O on the large diameter rod pipe 2, the plurality of step parts 22 is continuously arranged along the rod shaft O direction.SELECTED DRAWING: Figure 2
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