# US 2014/0155190 A1 · Golf club

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- Number: US 2014/0155190 A1
- Document ID: US20140155190A1
- Status: Published application
- Kind: A1
- Application number: 14/094,111
- Filed: 2013-12-02
- Published: 2014-06-05
- Earliest claimed: 2012-12-03
- Assignees: Dunlop Sports Co. Ltd.
- Applicants: Dunlop Sports Co. Ltd.
- Inventors: Takashi NAKAMURA
- Web page: https://patentgrep.com/patent/US20140155190A1

## CPC

- A63B 60/00: Details or accessories of golf clubs, bats, rackets or the like
- A63B 53/00: Golf clubs
- A63B 53/0466: {wood-type}
- A63B 53/10: Non-metallic shafts
- A63B 53/0408: {characterised by specific dimensions, e.g. thickness}
- A63B 2209/023: Long, oriented fibres, e.g. wound filaments, woven fabrics, mats
- A63B 2225/02: Testing, calibrating or measuring of equipment
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

A club 2 includes a head 4, a shaft 6 and a grip 8. A club length L1 is 45 inches or greater and 48 inches or less. A ratio (Wh/Wc) of a head weight Wh to a club weight Wc is equal to or greater than 0.71. A moment of inertia Ix about an axis of a swing is equal to or less than 6.90×103 (kg·cm2). However, when the club weight is defined as Wc (kg); an axial-directional distance between a grip end and a center of gravity of the club is defined as Lc (cm); and a moment of inertia about the center of gravity of the club is defined as Ic (kg·cm2), the moment of inertia Ix (kg·cm2) is calculated by the following formula (1) Ix=Wcx (Lc+60)2+Ic (1)

## Claims

### Claim 1

A golf club comprising: a head; a shaft; and a grip,
wherein a club length is 45 inches or greater and 48 inches or less;
a ratio (Wh/Wc) of a head weight Wh to a club weight Wc is equal to or greater than 0.71;
a moment of inertia Ix about an axis of a swing is equal to or less than 6.90×103 (kg·cm2); and
when the club weight is defined as Wc (kg); an axial-directional distance between a grip end and a center of gravity of the club is defined as Lc (cm); and a moment of inertia about the center of gravity of the club is defined as Ic (kg·cm2), the moment of inertia Ix (kg·cm2) is calculated by the following formula (1).
Ix=Wc×(Lc+60)2+Ic (1)

### Claim 2 (depends on 1)

The golf club according to claim 1, wherein when a static moment of the club is defined as Mt, a ratio (Ix/Mt) is equal to or less than 435; and
the static moment Mt (kg·cm2) is calculated by the following formula (2).
Mt=Wc×(Lc−35.6) (2)

### Claim 3 (depends on 1)

The golf club according to claim 1, wherein when an axial-directional distance between a tip of the shaft and a center of gravity of the shaft is defined as Lg, and a shaft length is defined as Ls, a ratio (Lg/Ls) is 0.5 or greater and 0.67 or less.

### Claim 4 (depends on 1)

The golf club according to claim 1, wherein the head weight Wh is equal to or greater than 0.175 kg.

### Claim 5 (depends on 1)

The golf club according to claim 1, wherein a shaft weight is equal to or less than 50 g.

### Claim 6 (depends on 1)

The golf club according to claim 1, wherein a grip weight is equal to or less than 40 g.