US2009291775A1PendingUtilityA1

Wood-type golf club head

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Assignee: HIRANO TOMOYAPriority: May 21, 2008Filed: Mar 24, 2009Published: Nov 26, 2009
Est. expiryMay 21, 2028(~1.9 yrs left)· nominal 20-yr term from priority
Inventors:Tomoya Hirano
A63B 53/0466A63B 2209/023A63B 2209/00A63B 53/0416A63B 53/0458A63B 53/0412A63B 53/0433A63B 53/0437A63B 53/0408A63B 53/042
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Claims

Abstract

A wood-type hollow golf club head has a lateral moment of inertia Ma and a vertical moment of inertia Mb which has a ratio (Mb/Ma) of not less than 0.80. The head can be provided with a hollow structure divided in the front-back direction of the head into a front member, a rear member and a middle member therebetween, wherein the middle member has a specific gravity smaller than those of the front member and rear member.

Claims

exact text as granted — not AI-modified
1 . A wood-type hollow golf club head having a lateral moment of inertia Ma and a vertical moment of inertia Mb which has a ratio (Mb/Ma) of not less than 0.80. 
   
   
       2 . The golf club head according to  claim 1 , wherein
 the ratio (Mb/Ma) is not less than 0.90.   
   
   
       3 . The golf club head according to  claim 1 , wherein
 the ratio (Mb/Ma) is not less than 1.00.   
   
   
       4 . The golf club head according to  claim 1 , wherein
 the vertical moment of inertia Mb is 3500 to 6000 g sq.cm.   
   
   
       5 . The golf club head according to  claim 1 , which has a hollow structure divided in the front-back direction of the head into a front member, a rear member and a middle member therebetween, wherein
 the middle member is tubular and has a specific gravity smaller than those of the front member and rear member.   
   
   
       6 . The golf club head according to  claim 1 , wherein
 the volume of the head is not less than 400 cc and not more than 470 cc.   
   
   
       7 . The golf club head according to  claim 1 , wherein
 the mass of the head is not less than 175 g and not more than 210 g.   
   
   
       8 . The golf club head according to  claim 1 , wherein
 the vertical moment of inertia Mb is not less than 3500 g sq.cm and not more than 6000 g sq.cm.   
   
   
       9 . The golf club head according to  claim 1 , wherein
 the height H of the head is not less than 40 mm and not more than 58 mm.   
   
   
       10 . The golf club head according to  claim 1 , wherein
 the gravity point height Hg of the head is not less than 20.0 mm and not more than 30.0 mm.   
   
   
       11 . The golf club head according to  claim 1 , wherein
 the height Hs of the sweet spot is not less than 25.0 mm and not more than 35.0 mm.   
   
   
       12 . The golf club head according to  claim 1 , wherein
 the ratio (Mb/Hg) of the vertical moment of inertia Mb to the gravity point height Hg is not less than 1250 g cm and not more than 2800 g cm.   
   
   
       13 . The golf club head according to  claim 1 , wherein
 the ratio (Mb/H) of the vertical moment of inertia Mb to the club head height H is not less than 635 g cm and not more than 1200 g cm.   
   
   
       14 . The golf club head according to  claim 13 , wherein
 the ratio (Mb/H) is not more than 900 g cm.   
   
   
       15 . The golf club head according to  claim 13 , wherein
 the ratio (Mb/H) is not more than 800 g cm.

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