Face structure of hollow-body metal golf club head

Abstract

The present invention relates to a face structure of a hollow-body, metal golf club head, comprising a face of laterally elongated shape, a crown and a sole plate fixed thereto, and particularly to a face structure having thin-walled areas for extended, stable carry and horizontally stabled trajectory. The face 11 has a thick-walled area 15 a of uniform thickness formed at the backside thereof, which extends from the heel side to the toe side thereof over the hitting area 16 a , and with thin-walled areas 15 b , 15 c of uniform thickness formed above and below the thick-walled area 15 a . An elongated portion 17 for fixing the crown and the sole plate is formed projecting backward on the backside periphery of the face 15.

What is claimed is:  
     
         1 . A face structure of a hollow-body, metal golf club head comprising: 
 a face of laterally elongated shape;    a crown and a sole plate fixed to said face;    said face having a thick-walled area of uniform thickness formed at the backside thereof and thin-walled areas of uniform thickness formed above and below said thick-walled area, the thick-walled area extending from the heel side to the toe side of said face over the hitting area.    
     
     
         2 . A face structure of a hollow-body, metal golf club head as claimed in  claim 1 , wherein the area of said thick-walled area is from 30 to 40% of the total area of said face's backside.  
     
     
         3 . A face structure of a hollow-body, metal golf club head as claimed in  claim 1 , wherein a vertical width of said thick-walled area is set from 15 mm to 20 mm.  
     
     
         4 . A face structure of a hollow-body, metal golf club head as claimed in  claim 1  or  2 , wherein an elongated portion for fixing said crown and said sole plate is formed projecting backward on the backside periphery of said face.  
     
     
         5 . A face structure of a hollow-body, metal golf club head as claimed in  claim 3 , wherein an elongated portion for fixing said crown and said sole plate is formed projecting backward on the backside periphery of said face.  
     
     
         6 . A face structure of a hollow-body, metal golf club head as claimed in  claim 4 , wherein said elongated portion has depth of 15 mm to 25 mm.  
     
     
         7 . A face structure of a hollow-body, metal golf club head as claimed in  claim 5 , wherein said elongated portion has depth of 15 mm to 25 mm.  
     
     
         8 . A face structure of a hollow-body, metal golf club head as claimed in any one of  claims 4  to  7 , wherein an angle between said face's backside and said elongated portion is set from over 90° to 100°.