Golf club head with improved center of gravity

Abstract

A golf club head with a variable center of gravity is disclosed herein. More specifically, the present invention discloses a wedge type golf club head wherein the center of gravity of the golf club head is adjustable along an x-axis in a heel to toe direction utilizing weights that are placed substantially near a sole portion of the golf club head. The resulting golf club head may generally have a more toe biased center of gravity location, especially when compared to a traditional golf club head. The present invention also discloses an innovative way to construct the golf club head to achieve those desirable center of gravity locations by utilizing various attachment techniques with different materials having different densities.

What is claimed is: 
     
         1 . A golf club head comprising:
 a chassis further comprising a hosel near a heel side of said golf club head, a striking face portion near a frontal portion of said golf club head, and a rear opening at a rear portion of said golf club head;   a back piece configured to at least partially fit in said rear opening; and   a weight pad configured to at least partially fit in said rear opening,   wherein at least one external surface of said back piece has a curvature that identically matches at least one curvature on said weight pad,   wherein said rear opening further comprises a male rivet stud protruding out from said rear opening, and said weight pad further comprises a female rivet socket, and   wherein said male rivet stud and said female rivet socket engage one another to retain said weight pad to said chassis.   
     
     
         2 . The golf club head of  claim 1 , wherein said back piece conceals said male rivet stud and said female rivet socket from view when combined with said weight pad to fill said rear opening. 
     
     
         3 . The golf club head of  claim 2 , wherein said weight pad is made out of a first material having a density of greater than about 7.8 g/cm 3 . 
     
     
         4 . The golf club head of  claim 2 , wherein said chassis further at least one cavity located near a sole portion of said golf club head. 
     
     
         5 . The golf club head of  claim 4 , further comprising a weight member configured to fit in said at least one cavity located near said sole portion of said golf club head. 
     
     
         6 . The golf club head of  claim 5 , further comprising two or more weight members configured to fit in a two or more cavities located near said sole portion of said golf club head. 
     
     
         7 . The golf club head of  claim 4 , wherein said back piece further comprises a supplemental cavity. 
     
     
         8 . The golf club head of  claim 7 , wherein said supplemental cavity is completely filled with a supplemental weight. 
     
     
         9 . The golf club head of  claim 7 , wherein said supplemental cavity is partially filled with a supplemental weight. 
     
     
         10 . The golf club head of  claim 2 , wherein at least one of said back piece or said weight pad further comprises a plurality of tabs, creating a gap between said at least one of said back piece or said weight pad and said chassis. 
     
     
         11 . The golf club head of  claim 10 , wherein said gap is filled with an adhesive. 
     
     
         12 . A golf club head comprising:
 a chassis further comprising a hosel near a heel side of said golf club head, a striking face portion near a frontal portion of said golf club head, and a rear opening at a rear portion of said golf club head;
 wherein said rear opening further comprises a male rivet stud protruding out from said rear opening, and 
   a weight pad configured to at least partially fit in said rear opening,
 wherein said weight pad further comprises a female rivet socket, 
 wherein an internal surface of said weight pad further comprises a plurality of tabs, said plurality of tabs create a gap between said weight pad and said chassis, and 
 wherein said gap is filled with an epoxy, and 
   wherein said male rivet stud and said female rivet socket engage one another to retain said weight pad to said chassis.   
     
     
         13 . The golf club head of  claim 12 , said weight pad is made out of a first material having a density greater than about 7.8 g/cm 3 . 
     
     
         14 . The golf club head of  claim 13 , wherein said chassis is made out of a material having a density of between about 2.0 g/cm 3  and about 8.0 g/cm 3 . 
     
     
         15 . The golf club head of  claim 14 , wherein said golf club head has a center of gravity greater than about 28 mm from an intersection point between a hosel bore axis and ground plane along an x-axis. 
     
     
         16 . The golf club head of  claim 15 , wherein said golf club head has a center of gravity greater than about 30 mm from an intersection point between a hosel bore axis and ground plane along an x-axis. 
     
     
         17 . The golf club head of  claim 16 , wherein said golf club head has a center of gravity greater than about 33 mm from an intersection point between a hosel bore axis and ground plane along an x-axis. 
     
     
         18 . A golf club head comprising:
 a chassis further comprising a hosel near a heel side of said golf club head, a striking face portion near a frontal portion of said golf club head, and a rear opening at a rear portion of said golf club head;   a back piece configured to at least partially fit in said rear opening; and   a weight pad configured to at least partially fit in said rear opening,   wherein said back piece and said weight pad combine to congruently fill said rear opening of said chassis,   wherein at least one external surface of said back piece has a curvature that identically matches at least one curvature on said weight pad, and   wherein said chassis further comprises a plurality of two or more cavities located near a sole portion of said golf club head.   
     
     
         19 . The golf club head of  claim 18 , wherein at least one of said back piece or said weight pad further comprises a plurality of tabs, creating a gap between said at least one of said back piece or said weight pad and said chassis, wherein said gap is filled with an epoxy. 
     
     
         20 . The golf club head of  claim 19 , wherein said rear opening further comprises a male rivet stud protruding out from said rear opening, and said weight pad further comprises a female rivet socket, and wherein said male rivet stud and said female rivet socket engage one another to retain said weight pad to said chassis.