Golf club head

Abstract

[Object] To provide a golf club head having various performances improved by a disposal of a rib. [Solution] A head 2 includes a face 4 , a crown 6 and a sole 8 . A rib rb is formed on an inner surface of the sole 8 . The rib rb has a sloped extension part ks 1 extending to be closer to a face side as approaching from a heel side to a toe side. A center of gravity of the head is positioned on the heel side relative to a face center. The head 2 is hollow. Preferably, the sole 8 has a minimum-thickness region. Preferably, the rib rb has a thin reinforcing part rb 2 positioned in the minimum-thickness region. The rib rb may extend linearly. The rib rb may extend curvedly. Preferably, a slope angle of the rib rb relative to a toe-heel direction is equal to or greater than 10° and equal to or less than 45°.

1 . A hollow golf club head comprising: a face; a crown; and a sole, wherein
 a rib is formed on an inner surface of the sole,   the rib has a sloped extension part extending to be closer to a face side of the head as approaching from a heel side to a toe side, and   a center of gravity of the head is positioned on the heel side relative to a face center.   
     
     
         2 . The golf club head according to  claim 1 , wherein
 the sole has a minimum-thickness region, and   the rib has a thin reinforcing part positioned in the minimum-thickness region.   
     
     
         3 . The golf club head according to  claim 1 , wherein
 a first recess part is formed on an outer surface of the sole,   a recess part for a weight is formed inside the first recess part,   a weight member can be attached to the recess part for a weight, and   the rib has a recess-part-reverse-side rib part positioned at a reverse side of the first recess part on the inner surface of the sole.   
     
     
         4 . The golf club head according to  claim 1 , wherein
 a second recess part is formed on an outer surface of the sole,   the second recess part forms a protruding extension part on an inner surface side of the sole, and   the protruding extension part extends along the rib.   
     
     
         5 . The golf club head according to  claim 1 , wherein the first recess part is continuous to the second recess part. 
     
     
         6 . The golf club head according to  claim 1  further comprising a side part, wherein
 a toe side end of the rib does not extend up to the side part, and 
 a heel side end of the rib extends up to the side part. 
 
     
     
         7 . The golf club head according to  claim 1 , wherein
 the rib extends linearly in a plan view,   a slope angle of the rib relative to a toe-heel direction is equal to or greater than 10° and equal to or less than 45°.   
     
     
         8 . The golf club head according to  claim 1 , wherein the rib extends curvedly so as to project toward a face side. 
     
     
         9 . The golf club head according to  claim 1 , wherein the rib extends curvedly so as to project toward a back side. 
     
     
         10 . The golf club head according to  claim 1 , wherein a length of the rib is equal to or greater than 50 mm and equal to or less than 150 mm.