Metal wood club

Abstract

A golf club head is provided with a body that has an address position with a zero degree bounce portion on the sole and a center sole position with a multi-relief surface of the sole having a negative bounce portion. The negative bounce portion may comprise a negative 0.5 to a negative 4.0 degree surface. In one embodiment, the multi-relief surface may comprise the negative bounce portion and a cutaway portion extending to the back of the sole, which may have a depth of about 0.05 to 0.5 inch from a regular sole surface. In another embodiment, the golf club head includes a weight system to adjust the center of gravity. In one embodiment, the weight system is a tube having a weight at one end that may be inserted into the golf club head to move the center of gravity at least forward and backward within 6 mm and up and down within 6 mm. Preferably, the tube is angled downward toward the face by at least 3 degrees.

We claim: 
     
         1 . A golf club head, the golf club head comprising:
 a body having a face, a sole, a crown, and a skirt joining the face, sole and crown, the body having a center of gravity;   the body having a coordinate system with an x-axis located horizontal to the club face, a y-axis located vertical to the club face, and a z-axis located through the club face, and   a weight system for the club head, wherein the center of gravity is adjustable along both the z-axis and the x-axis;   wherein the weight system further comprises;
 a cavity and a weighted insert, wherein the weighted insert further comprises;
 a heavy end at a first terminal end of the weighted insert, 
 a lighter end at a second terminal end of the weighted insert, and 
 a central portion, placed between the heavy end and the lighter end of the weighted insert. 
 
   
     
     
         2 . The golf club head of  claim 1 , wherein the heavy end is made out of a material having a density of greater than about 10.9 g/cm 3 . 
     
     
         3 . The golf club head of  claim 2 , wherein the central portion is made out of a material having a density of less than about 2.5 g/cm 3 . 
     
     
         4 . The golf club head of  claim 1 , wherein the cavity is offset from the x-axis at an angle θ of between about 0 to about 90 degrees. 
     
     
         5 . The golf club head of  claim 4 , wherein the cavity is offset from the x-axis at an angle θ of between about 3 to about 45 degrees. 
     
     
         6 . The golf club head of  claim 5 , wherein the cavity is offset from the x-axis at an angle θ of between about 5 to about 35 degrees. 
     
     
         7 . The golf club head of  claim 4 , wherein the golf club head has an Angle to Volume Ratio of between about 0.02 degrees/cc to about 0.25 degrees/cc;
 the Angle to Volume Ratio is defined as the angle θ of the offset of the cavity from the x-axis divided by the volume of the golf club head.   
     
     
         8 . The golf club head of  claim 7 , wherein the golf club head has an Angle to Volume Ratio of between about 0.05 degrees/cc to about 0.255 degrees/cc. 
     
     
         9 . The golf club head of  claim 8 , wherein the golf club head has an Angle to Volume Ratio of between about 0.10 degrees/cc to about 0.20 degrees/cc. 
     
     
         10 . A golf club head, the golf club head comprising:
 a body having a face, a sole, a crown, and a skirt joining the face, sole and crown, the body having a center of gravity;   the body having a coordinate system with an x-axis located horizontal to the club face, a y-axis located vertical to the club face, and a z-axis located through the club face,   wherein the weight system further comprises a cavity and a weighted insert, the cavity is offset from the x-axis at an angle θ of between about 0 to about 90 degrees.   
     
     
         11 . The golf club head of  claim 10 , wherein the golf club head has an Angle to Volume Ratio of between about 0.02 degrees/cc to about 0.25 degrees/cc;
 the Angle to Volume Ratio is defined as the angle θ of the offset of the cavity from the x-axis divided by the volume of the golf club head.   
     
     
         12 . The golf club head of  claim 11 , wherein the golf club head has an Angle to Volume Ratio of between about 0.05 degrees/cc to about 0.255 degrees/cc. 
     
     
         13 . The golf club head of  claim 12 , wherein the golf club head has an Angle to Volume Ratio of between about 0.10 degrees/cc to about 0.20 degrees/cc. 
     
     
         14 . The golf club head of  claim 10 , wherein the center of gravity is movable within a 6 mm distance along the z-axis. 
     
     
         15 . The golf club head of  claim 14 , wherein the center of gravity is movable within a 4 mm distance along the z-axis. 
     
     
         16 . The golf club head of  claim 10 , wherein the center of gravity is movable within a 2 mm distance along the x-axis. 
     
     
         17 . The golf club head of  claim 16 , wherein the center of gravity is movable within a 0.5 mm distance along the x-axis. 
     
     
         18 . A golf club head, the golf club head comprising:
 a body having a face, a sole, a crown, and a skirt joining the face, sole and crown, the body having a center of gravity;   the body having a coordinate system with an x-axis located horizontal to the club face, a y-axis located vertical to the club face, and a z-axis located through the club face, and   a weight system for the club head, wherein the center of gravity is adjustable along both the z-axis and the x-axis;   wherein the weight system further comprises;
 a cavity and a weighted insert, wherein the weighted insert further comprises;
 a heavy end at a first terminal end of the weighted insert, 
 a lighter end at a second terminal end of the weighted insert, and 
 a central portion, placed between the heavy end and the lighter end of the weighted insert; 
 
   wherein the weight system allows the center of gravity of the golf club head to be adjustable along both the z-axis and the x-axis.   
     
     
         19 . The golf club head of  claim 18 , wherein the weight system further comprises a cavity and a weighted insert, the cavity is offset from the x-axis at an angle θ of between about 0 to about 90 degrees. 
     
     
         20 . The golf club head of  claim 19 , wherein the weighting system further comprises a sleeve, circumferentially encompassing the weighted insert, adapted change a sole contact angle of the golf club head.