Sole for iron golf club head

Abstract

The invention creates a unique combination of head shape and surface friction coefficients that minimize the bad effects of turf impact. The invention is an iron-type golf club head having a body composed of a stainless steel material and having a front wall, a sole portion and an undercut recess. The sole portion extends rearward from the front wall and has a main surface, a stepped surface and an edge between the main surface and the stepped surface.

I claim as my invention the following: 
     
         1 . An iron-type golf club head comprising:
 a body composed of a stainless steel material and having a front wall, a sole portion and an undercut recess, the sole portion extending rearward from the front wall and having a main surface, a stepped surface and an edge between the main surface and the stepped surface, wherein the sole portion has a length ranging from 7.5 cm to 10.0 cm and a width ranging from 1.0 cm to 4.0 cm, wherein the main surface has a width ranging from 1.0 cm to 2.5 cm, wherein the stepped surface has a width ranging from 0.25 cm to 1.5 cm, and wherein the edge has a height ranging from 0.3 cm to 0.5 cm.   
     
     
         2 . An iron-type golf club head comprising:
 a body composed of a stainless steel material and having a front wall, a hosel, a heel portion, a toe portion, a top portion, a sole portion and an undercut recess, the heel portion, the toe portion, the top portion and the sole portion defining an external rear cavity, the sole portion extending rearward from the front wall and having a main surface, stepped surface and an edge between the main surface and the stepped surface, wherein the sole portion has a length ranging from 7.5 cm to 10.0 cm and a width ranging from 1.0 cm to 4.0 cm, wherein the main surface has a width ranging from 1.0 cm to 2.5 cm, wherein the stepped surface has a width ranging from 0.25 cm to 1.5 cm, and wherein the edge has a height ranging from 0.3 cm to 0.5 cm.