IP Library Granted Patent US 9,776,055
Granted Patent B2
US 9,776,055 · App. 14/848,999 · Granted Oct 3, 2017

Golf club

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Quick Facts
Patent No.
US 9,776,055
App. No.
14/848,999
Granted
Oct 3, 2017
Kind
B2
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 2870 (kg·cm 2 ) or greater and less than 2920 (kg·cm 2 ). Isw/Ige is equal to or less than 2.46. 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·cm 2 ). Isw is calculated by Equation (1) below. Ige is calculated by Equation (2) below. I sw= Wc ×( Lc +60) 2 +Ic   (1) I ge= Wc ×( Lc ) 2 +Ic   (2)

Claims (14)

1. A golf club comprising:

a head, a shaft portion, and a grip portion,

wherein:

the golf club has a club weight Wc;

the grip portion has a grip weight Wg that is equal to or less than 0.037 kg;

if a club inertia moment about a swing axis is defined as Isw (kg·cm 2 ), and a club inertia moment about a grip end is defined as Ige (kg·cm 2 ),

the inertia moment Ige is 2870 (kg·cm 2 ) or greater and less than 2920 (kg·cm 2 ), and Isw/Ige is equal to or less than 2.46;

if the club weight is defined as Wc (kg), an axial direction distance from the grip portion 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 ),

the inertia moment Isw (kg·cm 2 ) is calculated by Equation (1) below, and the inertia moment Ige (kg·cm 2 ) is calculated by Equation (2) below,

I sw= Wc ×( Lc+ 60) 2 +Ic   (1)

I ge= Wc ×( Lc ) 2 +Ic   (2);

wherein the grip portion and shaft portion do not include a weight member; and wherein the head has a head weight Wh that is equal to or greater than 0.196 kg.

2. The golf club according to claim 1 , wherein Wh/Wc is equal to or greater than 0.67.

3. The golf club according to claim 1 , wherein the golf club has a club length that is less than 46 inches.

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 Sep 10, 2015
From: UEDA, NAOYOSHI; UEDA, MASAHIKO; SUGIMOTO, YASUSHI; NAKAMURA, TAKASHI; HAYASE, SEIJI; KIMIZUKA, WATARU
To: DUNLOP SPORTS CO. LTD.
Reel/Frame 036530/0593 →