Iron-type golf club

Abstract

As functions demanded for an iron-type golf club, (1) Spin performance, (2) Trajectory directivity, (3) Striking feeling, (4) Follow-through feeling, (5) Distance controllability, (6) Flyer improvement, and the like are mentioned. In order to satisfy these functions, it is devised to improve the properties of an iron-type golf club by subjecting particularly a soft iron forged head to surface treatment. A foundation layer of an electroless Ni—P plating film is formed over the entire surface of a soft iron forged head and also a surface layer of an electroless Ni—P—W plating film is formed over the entire surface of the foundation layer. Heat treatment is performed at 300 to 700° C. when forming the electroless Ni—P—W plating film. The head is a wedge type head having a pitching wedge, an approach wedge, or a sand wedge.

1 . An iron-type golf club comprising:
 a foundation layer of an electroless Ni—P plating film formed over an entire surface of a soft iron forged head; and   a surface layer of an electroless Ni—P—W plating film formed over an entire surface of the foundation layer.   
     
     
         2 . The iron-type golf club according to  claim 1 , wherein heat treatment is performed at 300 to 700° C. when forming the electroless Ni—P—W plating film. 
     
     
         3 . The iron-type golf club according to  claim 1 , wherein the head is a wedge type head having a pitching wedge, an approach wedge, or a sand wedge. 
     
     
         4 . An iron-type golf club comprising:
 a foundation layer of an electroless Ni—P plating film formed over an entire surface of a soft iron forged head; and   a surface layer of an electroless Ni—P—W plating film formed on a surface except an impact surface of a face and also an Ag plating film formed on the impact surface of the foundation layer.   
     
     
         5 . An iron-type golf club, comprising:
 a foundation layer of an electroless Ni—P plating film formed over an entire surface of a soft iron forged head;   a surface layer of an electroless Ni—P—W plating film formed over an entire surface of the foundation layer; and   an Ag plating film formed on an impact surface of a face of the surface layer.   
     
     
         6 . The iron-type golf club according to  claim 4 , wherein heat treatment is performed at 300 to 700° C. when forming the electroless Ni—P—W plating film. 
     
     
         7 . The iron-type golf club according to  claim 4 , wherein a mechanical impact is applied to the Ag plating film to increase density. 
     
     
         8 . The iron-type golf club according to  claim 4 , wherein the head is a wedge type head having a pitching wedge, an approach wedge, or a sand wedge. 
     
     
         9 . The iron-type golf club according to  claim 5 , wherein heat treatment is performed at 300 to 700° C. when forming the electroless Ni—P—W plating film. 
     
     
         10 . The iron-type golf club according to  claim 5 , wherein a mechanical impact is applied to the Ag plating film to increase density. 
     
     
         11 . The iron-type golf club according to  claim 5 , wherein the head is a wedge type head having a pitching wedge, an approach wedge, or a sand wedge.