Golf club head

Abstract

A head 2 includes a head body h 1 and at least one weight . The head body h 1 includes a face 10 , an upper-side weight-disposal part Wa positioned on an upper side of a center of gravity HG of the head body h 1 , and a lower-side weight-disposal part Wb positioned on a lower side of the center of gravity HG of the head body h 1 . At least one of the upper-side weight-disposal part Wa and the lower-side weight-disposal part Wb is configured to change mass distribution in a toe-heel direction. The upper-side weight-disposal part Wa may be constituted of a first weight port WP 1 and a second weight port WP 2 . The lower-side weight-disposal part Wb may be constituted of a third weight port WP 3 and a fourth weight port WP 4.

What is claimed is: 
     
         1 . A golf club head comprising:
 a head body; and   at least one weight, wherein:   the head body includes an upper-side weight-disposal part positioned on an upper side of a center of gravity of the head body, and a lower-side weight-disposal part positioned on a lower side of the center of gravity of the head body; and   at least one of the upper-side weight-disposal part and the lower-side weight-disposal part is configured to change mass distribution in a toe-heel direction.   
     
     
         2 . The golf club head according to  claim 1 , wherein:
 the upper-side weight-disposal part is constituted of a first weight port and a second weight port; and   the lower-side weight-disposal part is constituted of a third weight port and a fourth weight port.   
     
     
         3 . The golf club head according to  claim 2 , wherein if the center of gravity of the head body is defined as an origin in a base state where the head is disposed on a level surface at a predetermined lie angle and loft angle; a straight line in the toe-heel direction passing through the origin is defined as an x-axis; a straight line in a vertical direction passing through the origin is defined as a y-axis; and a plane parallel to the x-axis and the y-axis is defined as an xy plane, a specific xy plane satisfying all of the following (a) to (d) exists:
 (a) a distance between the specific xy plane and the first weight port is equal to or less than 20 mm;   (b) a distance between the specific xy plane and the second weight port is equal to or less than 20 mm;   (c) a distance between the specific xy plane and the third weight port is equal to or less than 20 mm; and   (d) a distance between the specific xy plane and the fourth weight port is equal to or less than 20 mm.   
     
     
         4 . The golf club head according to  claim 3 , wherein:
 an xy coordinate system is constituted of the x-axis and the y-axis in planar view from a face side; and   in the planar view, the first weight port is positioned in a first quadrant of the xy coordinate system; the second weight port is positioned in a second quadrant of the xy coordinate system; the third weight port is positioned in a third quadrant of the xy coordinate system; and the fourth weight port is positioned in a fourth quadrant of the xy coordinate system.   
     
     
         5 . The golf club head according to  claim 3 , wherein:
 the golf club head includes three principal axes of inertia orthogonal to each other; and   of the three principal axes of inertia, a principal axis of inertia having the smallest angle with respect to the y-axis is projected on the xy plane to obtain a straight line, the straight line is defined as a base line, and the angle between the base line and the y-axis is defined as an inclination of the principal axis of inertia; a height of a center of gravity of the head is defined as Gy; and a position of the center of gravity of the head in the toe-heel direction is defined as Gx,   the head is configured to change the inclination of the principal axis of inertia without changing the height Gy and the position Gx.   
     
     
         6 . The golf club head according to  claim 1 , wherein if a height of a center of gravity of the head is defined as Gy and a position of the center of gravity of the head in the toe-heel direction is defined as Gx, the head is configured to change the position Gx without changing the height Gy, and the head is configured to change the position Gy without changing the position Gx. 
     
     
         7 . The golf club head according to  claim 5 , wherein an adjustable range of the height Gy is 1 mm or greater and 10 mm or less under a condition where amass of the head is constant. 
     
     
         8 . The golf club head according to  claim 5 , wherein an adjustable range of the position Gx is 1 mm or greater and 15 mm or less under a condition where a mass of the head is constant. 
     
     
         9 . The golf club head according to  claim 1 , wherein:
 the golf club head includes three principal axes of inertia orthogonal to each other; and   of the three principal axes of inertia, a principal axis of inertia having the smallest angle with respect to the y-axis is projected on the xy plane to obtain a straight line, the straight line is defined as a base line, and the angle between the base line and the y-axis is defined as an inclination of the principal axis of inertia,   an adjustable range of the inclination of the principal axis of inertia is 1 degree or greater and 20 degrees or less under a condition where a mass of the head is constant.