Iron head

Abstract

An iron head is provided with a recess portion provided in an upper portion of a backside surface thereof, and a protruding portion provided at a lower portion of the backside surface. A first hollow portion is provided on a heel side from a bottom surface of a recess portion to a sole surface; and a second hollow portion is disposed on a toe side. The first hollow portion and the second hollow portion do not exist behind a sweet area. The first hollow portion and the second hollow portion may be filled with a shock absorber formed of a rubber or an elastomer.

1 . An iron head comprising:
 a striking face;   a backside surface;   a sole surface;   a hosel;   a recess portion provided in an upper portion of the backside surface;   a protruding portion provided at a lower portion of the backside surface and projecting backward;   a first hollow portion provided on a heel side of the protruding portion; and   a second hollow portion disposed on a toe side and inside the protruding portion, said protruding portion including a middle portion between the first hollow portion and the second hollow portion,   wherein said first hollow portion is disposed away from the second hollow portion by a distance gradually increasing from an upper surface of the protruding portion toward the sole surface.   
     
     
         2 . The iron head according to  claim 1 , wherein at least one of said first hollow portion and said second hollow portion penetrates from an upper surface of the protruding portion to the sole surface, and has a first lid to close the sole surface. 
     
     
         3 . The iron head according to  claim 1 , wherein at least one of said first hollow portion and said second hollow portion has a second lid to close an upper portion thereof. 
     
     
         4 . The iron head according to  claim 1 , wherein said first hollow portion is disposed away from the second hollow portion by the distance equal to a distance between the upper surface of the protruding portion and the sole surface. 
     
     
         5 . The iron head according to  claim 1 , wherein said first hollow portion is disposed away from the second hollow portion by the distance of 10 to 30 mm. 
     
     
         6 . The iron head according to  claim 1 , wherein said first hollow portion is disposed away from the second hollow portion by the distance of 10 to 30 mm at the upper surface of the protruding portion. 
     
     
         7 . The iron head according to  claim 1 , wherein at least one of said first hollow portion and said second hollow portion is disposed not to reach the sole surface. 
     
     
         8 . The iron head according to  claim 1 , wherein at least one of said first hollow portion and said second hollow portion is filled with a shock absorber. 
     
     
         9 . The iron head according to  claim 9 , wherein said shock absorber is made of a rubber or an elastomer. 
     
     
         10 . The iron head according to  claim 1 , wherein said striking face includes a plurality of score lines including a longest score line, said middle portion being disposed so that a center line of the middle portion is aligned with a center line of the longest score line. 
     
     
         11 . The iron head according to  claim 1 , wherein said first hollow portion has a first length in a vertical direction, said second hollow portion having a second length in the vertical direction greater than the first length.