公开(公告)号：US12290726B2

公开(公告)日：2025-05-06

申请号：US17298179

申请日：2019-10-18

Applicant: NHK SPRING CO., LTD.

Inventor： Kosuke Fujiwara ,  Akihisa Inoue

IPC: A63B53/10 ,  A63B53/12

Abstract: Provided is a golf shaft, capable of ensuring bending rigidity required for a golf club and providing good hit feeling in a composite shaft with 50 g-130 g. The golf shaft comprises an element tube made of metal, an outer layer made of a fiber reinforced plastic and covering an outer periphery of the element tube over an entire length of the element tube in an axial direction, an adhesive layer interposed between the element tube and the outer layer to bond between the element tube and the outer layer, wherein weight of a whole including the element tube, the outer layer, and the adhesive layer is 50 g-130 g, and weight of the element tube is 50%-90% of the weight of the whole.

公开(公告)号：US10974110B2

公开(公告)日：2021-04-13

申请号：US16321289

申请日：2018-05-17

Applicant: NHK Spring Co., Ltd.

Inventor： Kosuke Fujiwara ,  Akihisa Inoue

IPC: A63B53/10 ,  A63B53/12 ,  C09J1/00 ,  C09J163/00 ,  C08K3/04 ,  C08K5/00 ,  C08K5/17

Abstract: Provided is a golf shaft comprising an element tube made of steel, a plating layer formed on an outer periphery of the element tube, an outer layer covering the plating layer, an adhesive layer interposed between the plating layer and the outer layer to bond between the plating layer and the outer layer. The outer layer is formed of a fiber reinforced plastic having a matrix resin that is an epoxy resin, and the adhesive layer is an epoxy resin composition or a carbon nano tube resin composition, the epoxy resin composition comprising an epoxy resin and a mixed curing agent in which two or more kinds of amine-based curing agents are mixed, and the carbon nano tube resin composition comprising an epoxy resin and at least one kind of curing agents as well as dispersed carbon nano tubes.