# US 10,864,411 B2 · Golf club

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- Number: US 10,864,411 B2
- Document ID: US10864411B2
- Status: Granted
- Kind: B2
- Application number: 14/849,130
- Filed: 2015-09-09
- Published: 2016-03-10
- Granted: 2020-12-15
- Earliest claimed: 2014-09-10
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Dunlop Sports Co. Ltd.
- Inventors: Naoyoshi Ueda; Masahiko Ueda; Yasushi Sugimoto; Takashi Nakamura; Seiji Hayase; Wataru Kimizuka
- Web page: https://patentgrep.com/patent/US10864411B2

## CPC

- A63B 53/0466: {wood-type}
- A63B 53/00: Golf clubs
- A63B 53/14: Handles
- A63B 60/42: Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand
- A63B 60/02: Ballast means for adjusting the centre of mass (A63B60/24, A63B60/54 take precedence)
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

A golf club 2 includes a head 4, a shaft 6, and a grip 8. A club inertia moment about a swing axis is defined as Isw. A club inertia moment about a grip end is defined as Ige. Ige is 2760 (kg·cm2) or greater and less than 2820 (kg·cm2). Isw/Ige is equal to or less than 2.42. A club weight is defined as Wc (kg), an axial direction distance from the grip end to a center of gravity of the club is defined as Lc (cm), and a club inertia moment about the center of gravity of the club is defined as Ic (kg·cm2). Isw is calculated by Equation (1) below. Ige is calculated by Equation (2) below. Isw=Wc×(Lc+60)2+Ic (1) Ige=Wc×(Lc)2+Ic (2)

## Claims

### Claim 1

A golf club comprising:
a head, a shaft with a shaft axis, and a grip, wherein:
if a club inertia moment about a swing axis is defined as Isw (kg·cm2), and a club inertia moment about an axis perpendicular to the shaft axis and passing through a grip end is defined as Ige (kg·cm2), wherein the swing axis is parallel to the axis passing through the grip end, and away from the grip end with a distance of 60 cm from the grip end so that the grip end is positioned between the swing axis and the head,
the inertia moment Ige is 2760 (kg·cm2) or greater and less than 2820 (kg·cm2), and Isw/Ige is equal to or less than 2.42; and
if a club weight is defined as Wc (kg), an axial direction distance from the grip end to a center of gravity of the club is defined as Lc (cm), and a club inertia moment about the center of gravity of the club is defined as Ic (kg·cm2),
the inertia moment Isw (kg·cm2) is calculated by Equation (1) below, and the inertia moment Ige (kg·cm2) is calculated by Equation (2) below:
Isw=Wc×(Lc+60)2+Ic (1)
Ige=Wc×(Lc)2+Ic (2), and
wherein a head weight Wh is equal to or greater than 0.188 kg, and a grip weight Wg is equal to or less than 0.026 kg.

### Claim 2 (depends on 1)

The golf club according to claim 1, wherein Wh/Wc is equal to or greater than 0.70.

### Claim 3 (depends on 1)

The golf club according to claim 1, wherein a club length is equal to or greater than 45.2 inches.

### Claim 4 (depends on 1)

The golf club according to claim 1, wherein a club length is equal to or greater than 45.2 inches, and if an axial direction distance from the tip end Tp to the center of gravity Gs of a shaft is defined as Lf1 (mm), and a shaft length is defined as Lf1 (mm), Lf1/Lf2 is equal to or greater than 0.53 and equal to or less than 0.67.

### Claim 5 (depends on 1)

The golf club according to claim 1, wherein a club length is equal to or greater than 45.2 inches, a head weight is defined as Wh (kg), and Wh/Wc is equal to or greater than 0.70.

### Claim 6 (depends on 1)

The golf club according to claim 1, wherein the grip weight Wg is equal to or less than 0.025 kg.