Low and back crown mass for a golf club head

Abstract

A golf club head includes a body having a crown defining a perimeter of the club head, a sole opposite the crown, a toe end opposite a heel end, a back end, and a hosel, the body further including a club face, an exterior side, an interior side, a head center of gravity, and a weight member positioned on one of the exterior side or the interior side of the crown.

1 . A golf club head comprising:
 a golf club head body having:
 a club face; 
 a crown defining a perimeter of the golf club head; 
 a sole opposite the crown; 
 a toe end opposite a heel end; 
 a back end opposite the club face; 
 a hosel; 
 an exterior surface, an interior surface; and 
 a head center of gravity defining an origin of a coordinate system including an x-axis and a z-axis, wherein the x-axis extends through the head center of gravity from the toe end to the heel end, and the z-axis extends through the head center of gravity from the club face to the back end; 
   a weight member permanently positioned adjacent the crown and projecting above a crown surface, the weight member having a weight member center of gravity and an elongated arcuate shape along the crown, wherein a first end of the weight member is positioned toward the toe end and a second end is positioned at the heel end;   wherein the x-axis and the z-axis are arranged to coincide with numbers on an analog clock, with the z-axis extending between a 12 o'clock position through the club face and a 6 o'clock position though the back end, and the x-axis extending between a 3 o'clock position through the toe end and a 9 o'clock position through the heel end;   wherein the weight member comprises a maximum projection height that is positioned at one or more positions selected from a group of positions consisting of: the 3 o'clock position, the 6 o'clock position, or the 9 o'clock position; and   wherein the weight member has a weight ranging from 20 grams to 130 grams.   
     
     
         2 . The golf club head of  claim 1 , wherein the weight member is integrally cast with the golf club head body. 
     
     
         3 . The golf club head of  claim 1 , wherein the weight member is solid in a cross section at any point. 
     
     
         4 . The golf club head of  claim 1 , wherein the weight member comprises a high density region having a greater density than remaining regions of the weight member. 
     
     
         5 . The golf club head of  claim 1 , wherein at least a portion of the weight member projects below the crown surface. 
     
     
         6 . The golf club head of  claim 1 , wherein the weight member includes a plurality of weight members. 
     
     
         7 . The golf club head of  claim 1 , wherein the weight member center of gravity is closer to the heel end than the toe end. 
     
     
         8 . The golf club head of  claim 1 , wherein the first end of the weight member is positioned at about the 3 o'clock position. 
     
     
         9 . The golf club head of  claim 1 , wherein the first end of the weight member is located between the 3 o'clock and 6 o'clock positions. 
     
     
         10 . The golf club head of  claim 1 , wherein:
 the crown comprises a series of concentric zones including an innermost zone and an outermost zone spaced from the innermost zone, wherein the outermost zone coincides with the perimeter; and   the weight member is disposed within the outermost zone.