公开(公告)号：US20240359070A1

公开(公告)日：2024-10-31

申请号：US18290562

申请日：2022-03-01

Applicant: NHK SPRING CO., LTD.

Inventor： Kosuke FUJIWARA

IPC: A63B53/12 ,  A63B53/10

CPC classification number: A63B53/12 ,  A63B53/10

Abstract: Provided is a golf shaft capable of realizing a sufficient low trajectory and low spin. The golf shaft has a rigidity distribution in which rigidity is gradually increased from a tip end section to a butt end section, and, in the rigidity distribution, has an intermediate point at which inclination is changed in an intermediate section between the tip end section and the butt end section, a difference in rigidity between the tip end section and the intermediate point is 3.00 kgf·m2-5.00 kgf·m2, and a difference in rigidity between the intermediate point and the butt end section is 2.00 kgf·m2or less.

公开(公告)号：US20220111271A1

公开(公告)日：2022-04-14

申请号：US17298179

申请日：2019-10-18

Applicant: NHK SPRING CO., LTD.

Inventor： Kosuke FUJIWARA ,  Akihisa INOUE

IPC: A63B53/10

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.