IP Library Granted Patent US 9,220,952
Granted Patent B2
US 9,220,952 · App. 14/337,477 · Granted Dec 29, 2015

Golf club

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Quick Facts
Patent No.
US 9,220,952
App. No.
14/337,477
Granted
Dec 29, 2015
Kind
B2
Abstract

A club includes a head, a shaft, and a grip. A club length L1 is 43 inches or greater and 48 inches or less. A ratio (Wh/Wc) between a head weight Wh and a club weight Wc is equal to or greater than 0.70. An inertia moment Ix about swing axis is 6.90×10 3 (kg·cm 2 ) or greater and 7.50×10 3 (kg·cm 2 ) or less. A static moment Mt (kg·cm) of the club is equal to or greater than 16.3 (kg·cm). The frequency of vibration of club is 240 (cpm) or greater and 280 (cpm) or less. The inertia moment Ix (kg·cm 2 ) is calculated by Equation (1): Ix=Wc ×( Lc +60) 2 +Ic   (1).

Claims (27)

1. A golf club comprising:

a head, a shaft, and a grip, wherein:

a club length is 43 inches or greater and 48 inches or less;

a ratio (Wh/Wc) between a head weight Wh and a club weight Wc is equal to or greater than 0.70;

an inertia moment Ix about a swing axis is 6.90×10 3 (kg·cm 2 ) or greater and 7.50×10 3 (kg·cm 2 ) or less;

a static moment Mt (kg·cm) of the club is equal to or greater than 16.3 (kg·cm); and

a frequency of vibration of the club is 240 (cpm) or greater and 280 (cpm) or less,

wherein the inertia moment Ix (kg·cm 2 ) is calculated by Equation (1), and the static moment Mt (kg·cm) is calculated by Equation (2):

Ix=Wc ×( Lc+ 60) 2 +Ic   (1)

Mt=Wc ×( Lc− 35.6)  (2)

if the club weight is defined as Wc (kg), an axial direction distance from a 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·cm 2 ).

2. The golf club according to claim 1 , wherein a ratio (Lg/Ls) is 0.55 or greater and 0.67 or less, if an axial direction distance from a tip end of the shaft to a center of gravity of the shaft is defined as Lg, and a shaft length is defined as Ls.

3. The golf club according to claim 1 , wherein the head weight Wh is equal to or greater than 0.190 kg.

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

5. The golf club according to claim 1 , wherein:

the ratio (Wh/Wc) is equal to or less than 0.80; and

the static moment Mt is equal to or less than 18.0 (kg·cm).

6. A golf club comprising:

a head, a shaft, and a grip, wherein;

a club length is 43 inches or greater and 48 inches or less;

a ratio (Wh/Wc) between a head weight Wh and a club weight Wc is equal to or greater than 0.70;

an inertia moment Ix about a swing axis is 6.90×10 3 (kg·cm 2 ) or greater and 7.50×10 3 (kg·cm 2 ) or less; and

a static moment Mt (kg·cm) of the club is equal to or greater than 16.3 (kg·cm),

wherein the inertia moment Ix (kg·cm 2 ) is calculated by Equation (1), and the static moment Mt (kg·cm) is calculated by Equation (2):

Ix=Wc ×( Lc+ 60) 2 +Ic   (1)

Mt=Wc ×( Lc− 35.6)  (2)

if the club weight is defined as Wc (kg), an axial direction distance from a 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·cm 2 ).

Assignments (2)
MERGER Recorded Apr 17, 2018
From: DUNLOP SPORTS CO. LTD.
To: SUMITOMO RUBBER INDUSTRIES, LTD.
Reel/Frame 045959/0204 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 23, 2014
From: NAKAMURA, TAKASHI
To: DUNLOP SPORTS CO. LTD.
Reel/Frame 033373/0253 →