Weighted titanium iron set

Abstract

The present invention is direct to a set of golf clubs comprising long irons, mid-irons and short irons. The invention contemplates the use of titanium for the main body portion and tungsten weight members coupled in a hollow cavity and a tungsten heel weight member coupled in a hosel cavity.

What is claimed is: 
     
         1 . A golf club comprising a club head having a club head mass and:
 a y-axis extending vertically through a face center of the club head and a Moment of Inertia about the y-axis and a z-axis extending vertically through a face center of the club head and a Moment of Inertia about the z-axis,   a body comprising a heel, a toe, a topline, a sole, and a back wall being formed from a first titanium;   a hosel coupled to the body being formed of a second titanium;   a face insert coupled to the body to form a hollow cavity between the face insert and the back wall and being formed of third titanium and having a face insert mass, the face insert having a face insert thickness at the face center;   a toe weight member formed of tungsten and is coupled in a lower, toe portion of the hollow cavity and has a toe weight member mass that comprises greater than 25% of the club head mass;   a first heel weight member formed of tungsten and coupled in a heel portion of the hollow cavity and has a first heel weight member mass of greater than 20% of the club head mass; and   a second heel weight member being located in a hosel cavity such that a shaft axis of the hosel intersects the second heel weight member below the hosel, the second heel weight member has a second heel weight member mass;   wherein the first heel weight mass plus the second heel weight mass is greater than 25% of the club head mass.   
     
     
         2 . The golf club of  claim 1 , the first titanium has a first ultimate tensile strength UTS 1 , the second titanium has a second ultimate tensile strength UTS 2  and the third titanium has a third ultimate tensile strength UTS 3  that conform to the following equation:
   UTS 2 <(UTS 1 -20 ksi)<(UTS 3 −40 ksi).
   
     
     
         3 . The golf club of  claim 1 , wherein the toe weight member mass is greater than about 65 grams. 
     
     
         4 . The golf club of  claim 3 , wherein the first heel weight member mass plus the second heel weight member mass is about the toe weight member mass. 
     
     
         5 . The golf club of  claim 4 , wherein the first heel weight member mass plus the second heel weight member mass plus the toe weight member mass is greater than 50% of the club head mass. 
     
     
         6 . The golf club of  claim 1 , wherein the Moment of Inertia about the y-axis is greater than 250 kg-mm 2 . 
     
     
         7 . The golf club of  claim 1 , wherein the Moment of Inertia about the z-axis is greater than 275 kg-mm 2 . 
     
     
         8 . The golf club of  claim 1 , wherein the club head has a center of gravity height from a ground plane CGy and a center of gravity depth from the face center CGz that is greater than or equal to 0.5*CGy. 
     
     
         9 . The golf club of  claim 1 , wherein the club head has a blade length that is preferably greater than 82 mm and has a Moment of Inertia about the y-axis to blade length ratio that is greater than 3 kg-mm. 
     
     
         10 . A golf club comprising a club head having a club head mass and:
 a y-axis extending vertically through a face center of the club head and a Moment of Inertia about the y-axis and a z-axis extending horizontally back through a face center of the club head and a Moment of Inertia about the z-axis,   a body comprising a heel, a toe, a topline, a sole, and a back wall being formed from a first titanium;   a hosel coupled to the body being formed of a second titanium;   a face insert coupled to the body to form a hollow cavity between the face insert and the back wall and being formed of third titanium and having a face insert mass, the face insert having a face insert thickness at the face center;   a toe weight member formed of tungsten and is coupled in a lower, toe portion of the hollow cavity and has a toe weight member mass that comprises greater than 25% of the club head mass;   a first heel weight member formed of tungsten and coupled in a heel portion of the hollow cavity and has a first heel weight member mass of greater than 20% of the club head mass; and   a second heel weight member being located in a hosel cavity such that a shaft axis of the hosel intersects the second heel weight member below the hosel, the second heel weight member has a second heel weight member mass; and   wherein the first titanium has a first ultimate tensile strength UTS 1 , the second titanium has a second ultimate tensile strength UTS 2  and the third titanium has a third ultimate tensile strength UTS 3  that conform to the following equation:   
       
         
           
             
               
                 UTS 
                 2 
               
               < 
               
                 ( 
                 
                   
                     UTS 
                     1 
                   
                   - 
                   
                     20 
                     ⁢ 
                         
                     ksi 
                   
                 
                 ) 
               
               < 
               
                 
                   ( 
                   
                     
                       UTS 
                       3 
                     
                     - 
                     
                       40 
                       ⁢ 
                           
                       ksi 
                     
                   
                   ) 
                 
                 .