Multi-component golf club head

Abstract

A metal wood golf club head adapted for attachment to a shaft, with a body comprising of a first body portion and a second body portion, each portion constructed of a different density material. Combining a high density material in the first body portion with a low density material in the second body portion, creates an ultra-low center of gravity relative to the geometric face center, resulting in higher launch angles and spin rate ratios. Thickening the lower area of the front face lowers the center of gravity and upwardly shifts the coefficient of restitution to the geometric center of the face

1 . A golf club head comprising a first body portion and a second body portion, the first body portion including a front face having a geometric face center; 
 the club head having a center of gravity of at least about 5 mm lower than the geometric face center;    the first body portion composed of a first material having a density, the second body portion composed of a second material having a density that is less than the density of the first material; and    the second body portion forms at least a crown section, and a substantial portion of a skirt section.    
   
   
       2 . The golf club head of  claim 1 , wherein the front face has a point of maximum coefficient of restitution not higher than about 2 mm below the geometric face center.  
   
   
       3 . The golf club head of  claim 1 , wherein the front face has a point of maximum coefficient of restitution not higher than about 5 mm below the geometric face center.  
   
   
       4 - 6 . (Cancelled)  
   
   
       7 . The golf club head according to  claim 1 , wherein the second body portion density is between about 0.1 g/cc to 4.0 g/cc.  
   
   
       8 . The golf club head according to  claim 1 , wherein the first material is a titanium alloy and the second material is a metal, or a composite or a thermoplastic.  
   
   
       9 . The golf club head according to  claim 8 , wherein the second material is magnesium.  
   
   
       10 . The golf club head according to  claim 8 , wherein the first material is a stainless steel alloy and the second material is metal, composite or a thermoplastic.  
   
   
       11 . The golf club head according to  claim 10 , wherein the second material is a titanium alloy.  
   
   
       12 . The golf club head of  claim 1 , wherein the second body portion is cast, formed, injection molded, machined or pre-preg sheet formed.  
   
   
       13 . The golf club head of  claim 1 , wherein the first body portion is forged.  
   
   
       14 . The golf club head of  claim 1 , wherein the first body portion is sheet metal formed.  
   
   
       15 . The golf club head of  claim 1 , wherein the first body portion is cast.  
   
   
       16 . The golf club head according to  claim 1 , wherein the club head has a maximum coefficient of restitution greater than 0.80.  
   
   
       17 . The golf club head according to  claim 2 , wherein the point of maximum coefficient of restitution is located approximate to a vertical plane including the geometric face center.  
   
   
       18 . The golf club head of  claim 1 , wherein the thickness of the front face is greater at a sole section than at a crown section.  
   
   
       19 . The golf club head according to  claim 1 , wherein a high density weight portion is integral with a sole section at a distance away from the face.  
   
   
       20 . The golf club head according to  claim 19 , wherein the high density weight portion is between about 15% to 25% of the total head weight.  
   
   
       21 . A golf club head comprising: 
 a first body portion composed of a first material having a density and having a front face interposed between a crown section and a sole section, the front face having a geometric face center and a point of maximum coefficient of restitution;    a second body potion composed of a second material having a density that is less than the density of the first material;    the second body portion forming at least a crown section and a substantial portion of a skirt section, and    the front face gradually increasing in thickness in a gradient from the crown section to the sole section,    wherein the club head has a center of gravity at least 6 mm lower than the geometric face center.    
   
   
       22 - 23 . (Cancelled)  
   
   
       24 . The golf club head according to  claim 21 , wherein the second body portion density is between about 0.1 g/cc to 4.0 g/cc.  
   
   
       25 . The golf club head according to  claim 21 , wherein the first material is a titanium alloy or a stainless steel alloy and the second material is magnesium.  
   
   
       26 . The golf club head according to  claim 21 , wherein the first material is a titanium alloy or a stainless steel alloy and the second material is aluminum or a graphite composite or a thermoplastic.  
   
   
       27 . The golf club head of  claim 21 , wherein the second body portion is cast, formed, injection molded, machined or pre-preg sheet formed.  
   
   
       28 . The golf club head of  claim 21 , wherein the first body portion is forged.  
   
   
       29 . The golf club head of  claim 21 , wherein the first body portion is sheet metal formed.  
   
   
       30 . The golf club head according to  claim 21 , wherein the point of maximum coefficient of restitution is located approximate to a vertical plane including the geometric face center.  
   
   
       31 . The golf club head according to  claim 21 , wherein the club head has a maximum coefficient of restitution greater than 0.80.  
   
   
       32 . The golf club head according to  claim 21 , wherein a high density weight portion is integral with the sole section at a distance away from the face.  
   
   
       33 . The golf club head according to  claim 32 , wherein the high density weight portion comprises tungsten or molybdenum.  
   
   
       34 . A golf club head comprising: 
 a first body portion and a second body portion, the first body portion including a front face having a variable face thickness; and    a second body portion having a low density crown section,    wherein the club head comprises a spin rate to launch angle ratio of less than about 275 at a geometric face center under robot test conditions.    
   
   
       35 . The golf club head according to  claim 34 , wherein the spin rate to launch angle ratio is less than 250.  
   
   
       36 . The golf club head according to  claim 34 , wherein the club head has a sweet spot approximately at the geometric face center or above.  
   
   
       37 . A golf club comprising: 
 a first body portion forming at least a face portion and a sole portion formed of a first metal having a first density;    a second body portion forming at least a substantial portion of a crown section formed of a second metal having a second density less than the first;    the second body portion forming at least a crown section, and a substantial portion of a skirt section, and    a hosel member extending above the crown section formed of a material having a density no greater than the first density.    
   
   
       38 . The golf club head of  claim 37 , wherein the front face has a point of maximum coefficient or restitution not higher than about 2 mm below the geometric face center.  
   
   
       39 . The golf club head of  claim 37 , wherein the front face has a point of maximum coefficient or restitution not higher than about 5 mm below the geometric face center  
   
   
       40 - 42 . (Cancelled)  
   
   
       43 . The golf club head according to  claim 37 , wherein the second body portion density is between about 0.1 g/cc to 4.0 g/cc.  
   
   
       44 . The golf club head according to claim , wherein the first material is a titanium alloy and the second material is a metal, or a composite or a thermoplastic.  
   
   
       45 . The golf club head according to  claim 44 , wherein the second material is magnesium.  
   
   
       46 . The golf club head according to  claim 37 , wherein the first material is a stainless steel alloy and the second material is metal, composite or a thermoplastic.  
   
   
       47 . The golf club head according to  claim 46 , wherein the second material is a titanium alloy.  
   
   
       48 . The golf club head of  claim 37 , wherein the second body portion is cast, formed, injection molded, machined or pre-preg sheet formed.  
   
   
       49 . The golf club head of  claim 37 , wherein the first body portion is forged.  
   
   
       50 . The golf club head of  claim 37 , wherein the first body portion is sheet metal formed.  
   
   
       51 . The golf club head of  claim 37 , wherein the first body portion is cast.  
   
   
       52 . The golf club head according to  claim 37 , wherein the club head has a maximum coefficient of restitution greater than 0.80.  
   
   
       53 . The golf club head according to  claim 52 , wherein the point of maximum coefficient of restitution is located approximate to a vertical plane including the geometric face center.  
   
   
       54 . The golf club head of  claim 37 , wherein the thickness of the front face is greater at a sole section than at a crown section.  
   
   
       55 . The golf club head according to  claim 37 , wherein a high density weight portion is integral with a sole section at a distance away from the face.  
   
   
       56 . The golf club head according to  claim 55 , wherein the high density weight portion is between about 15% to 25% of the total head weight.