Golf club head

Abstract

A golf club head formed of an alloy of steel that is capable of improving the center of gravity (CG) location while maintaining traditional external dimensions of the golf club head. More specifically, the golf club head in accordance with the present invention achieves a relatively low CG while maintaining traditional external dimensions by reducing the amount of mass contributed by the crown, the striking face, and the hosel, and strategically reallocating this mass within and/or proximate the sole of the golf club head.

What is claimed is: 
     
         1 . A golf club head comprising:
 a striking face, having a face center, a crown, a sole opposite said crown, a heel, a toe opposite said heel, and a hosel adjacent said heel and configured to join said golf club head to a shaft,   wherein an X-axis is defined as a horizontal axis tangent to said face center of said striking face with a positive direction towards said heel of said golf club head, a Y-axis is a vertical axis orthogonal to said X-axis with a positive direction towards said crown of said golf club head, and a Z-axis being orthogonal to both said X-axis and said Y-axis with a positive direction towards a front of said golf club head, wherein an origin of said X-axis, said Y-axis, and said Z-axis is centered at a center of gravity (CG) of said golf club head,   wherein said sole of said golf club head further comprises an oversized weight receptacle, adapted to engage a multi-piece weight system,   wherein said multi-piece weight system further comprises;
 an oversized base weight further comprising a secondary weight receptacle, 
 a removable weight, and 
 a threaded fastener, 
 wherein said oversized base weight is adapted to engage said oversized weight receptacle, 
 wherein said removable weight is adapted to engage said secondary weight receptacle, and 
 wherein said threaded fastener is adapted to retain said removable weight via an engagement to said sole of said golf club head. 
   
     
     
         2 . The golf club head of  claim 1 , wherein said oversized base weight has a first density, and wherein said removable weight has a second density,
 wherein said first density is greater than said second density.   
     
     
         3 . The golf club head of  claim 1 , wherein said secondary weight receptacle of said oversized base weight further comprises a base floor,
 wherein said base floor is adapted to engage said removable weight to be indirectly retained within said oversized weight receptacle via said threaded fastener.   
     
     
         4 . The golf club head of  claim 1 , wherein said secondary weight receptacle of said oversized base weight further comprises an empty base,
 wherein said empty base allows said oversized base weight to move independently of said removable weight.   
     
     
         5 . The golf club head of  claim 1 , wherein a mass of said golf club head below an X-Z plane set at a vertical height from a ground plane equal to 25% of a peak crown height measurement is greater than about 45% of a total mass of said golf club head. 
     
     
         6 . The golf club head of  claim 5 , wherein said mass of said golf club head below said X-Z plane set at a vertical height from said ground plane equal to 15% of said peak crown height measurement is greater than about 27% of said total mass of said golf club head. 
     
     
         7 . The golf club head of  claim 6 , wherein said mass of said golf club head below said X-Z plane set at a vertical height from said ground plane equal to 10% of said peak crown height measurement is greater than about 12% of said total mass of said golf club head. 
     
     
         8 . The golf club head of  claim 1 , wherein said golf club head has a Maximum Sole Thickness to Minimum Crown Thickness Ratio of greater than or equal to about 4.0, said Maximum Sole Thickness to Minimum Crown Thickness Ratio defined as: 
       
         
           
             
               
                 Maximum 
                 ⁢ 
                     
                 Sole 
                 ⁢ 
                     
                 Thickness 
                 ⁢ 
                     
                 to 
                 ⁢ 
                     
                 Minimum 
                 ⁢ 
                     
                 Crown 
                 ⁢ 
                     
                 Thickness 
                 ⁢ 
                     
                 Ratio 
               
               = 
               
                 
                   
                     Maximum 
                     ⁢ 
                         
                     Sole 
                     ⁢ 
                         
                     Thickness 
                     ⁢ 
                         
                     
                       ( 
                       mm 
                       ) 
                     
                   
                   
                     Minimum 
                     ⁢ 
                         
                     Crown 
                     ⁢ 
                         
                     Thickness 
                     ⁢ 
                         
                     
                       ( 
                       mm 
                       ) 
                     
                   
                 
                 . 
               
             
           
         
       
     
     
         9 . The golf club head of  claim 8 , wherein said Maximum Sole Thickness to Minimum Crown Thickness Ratio is greater than or equal to about 4.5. 
     
     
         10 . The golf club head of  claim 9 , wherein said Maximum Sole Thickness to Minimum Crown Thickness Ratio is greater than or equal to about 4.75. 
     
     
         11 . The golf club head of  claim 1 , wherein said golf club head has a CG-Yg of less than about 16.0 mm. 
     
     
         12 . The golf club head of  claim 11 , wherein said CG-Yg is between about 11.0 mm and about 15.0 mm. 
     
     
         13 . The golf club head of  claim 12 , wherein CG-Yg is between about 12.0 mm and about 14.5 mm. 
     
     
         14 . The golf club head of  claim 1 , wherein a ΔYccg is between about 22.0 mm and about 28.0 mm, said ΔYccg defined as: 
       
         
           
             
               
                 Δ 
                 ⁢ 
                 Yccg 
               
               = 
               
                 
                   Peak 
                   ⁢ 
                       
                   Crown 
                   ⁢ 
                       
                   Height 
                   ⁢ 
                       
                   
                     ( 
                     mm 
                     ) 
                   
                 
                 - 
                 CG 
                 - 
                 
                   Yg 
                   ⁢ 
                       
                   
                     
                       ( 
                       mm 
                       ) 
                     
                     . 
                   
                 
               
             
           
         
       
     
     
         15 . The golf club head of  claim 14 , wherein said ΔYccg is between about 23.0 mm to about 26.0 mm. 
     
     
         16 . The golf club head of  claim 15 , wherein said ΔYccg is between about 24.0 mm and about 25.0 mm. 
     
     
         17 . A golf club head comprising:
 a striking face, having a face center, a crown, a sole opposite said crown, a heel, a toe opposite said heel, and a hosel adjacent said heel and configured to join said golf club head to a shaft,   wherein an X-axis is defined as a horizontal axis tangent to said face center of said striking face with a positive direction towards said heel of said golf club head, a Y-axis is a vertical axis orthogonal to said X-axis with a positive direction towards said crown of said golf club head, and a Z-axis being orthogonal to both said X-axis and said Y-axis with a positive direction towards a front of said golf club head, wherein an origin of said X-axis, said Y-axis, and said Z-axis is centered at a center of gravity (CG) of said golf club head,   wherein said sole of said golf club head further comprises an oversized weight receptacle, adapted to engage a multi-piece weight system,   wherein said multi-piece weight system further comprises;
 an oversized base weight further comprising a secondary weight receptacle, 
 a removable weight, and 
 a threaded fastener, 
 wherein said oversized base weight is adapted to engage said oversized weight receptacle, 
 wherein said removable weight is adapted to engage said secondary weight receptacle, and 
 wherein said threaded fastener is adapted to retain said removable weight via an engagement to said sole of said golf club head; 
   wherein a mass of said golf club head below an X-Z plane set at a vertical height from a ground plane equal to 25% of a peak crown height measurement is greater than about 45% of a total mass of said golf club head, and   wherein said golf club head has a CG-Yg of less than about 16.0 mm.   
     
     
         18 . The golf club head of  claim 17 , wherein said CG-Yg is between about 11.0 mm and about 15.0 mm. 
     
     
         19 . The golf club head of  claim 18 , wherein CG-Yg is between about 12.0 mm and about 14.5 mm. 
     
     
         20 . A golf club head comprising:
 a striking face, having a face center, a crown, a sole opposite said crown, a heel, a toe opposite said heel, and a hosel adjacent said heel and configured to join said golf club head to a shaft,   wherein an X-axis is defined as a horizontal axis tangent to said face center of said striking face with a positive direction towards said heel of said golf club head, a Y-axis is a vertical axis orthogonal to said X-axis with a positive direction towards said crown of said golf club head, and a Z-axis being orthogonal to both said X-axis and said Y-axis with a positive direction towards a front of said golf club head, wherein an origin of said X-axis, said Y-axis, and said Z-axis is centered at a center of gravity (CG) of said golf club head,   wherein said sole of said golf club head further comprises an oversized weight receptacle, adapted to engage a multi-piece weight system,   wherein said multi-piece weight system further comprises;
 a removable weight, 
 a non-removable weight, and 
 threaded fastener, 
   wherein said non-removable weight is attached to said oversized weight receptacle via an adhesive,   wherein said removable weight is attached to said non-removable weight when said threaded fastener engages said sole of said golf club head, and   wherein said non-removable weight is juxtaposed between said oversized weight receptacle and said removable weight wherein no point of said removable weight contacts said oversized weight receptacle of said sole of said golf club head.