Golf club head

Abstract

A golf club head includes a weight object and a weight object receiving portion that is provided on an outer surface of the head and in which at least a part of the weight object is housed. The weight object or the weight object receiving portion includes a shape change mechanism that enables the weight object or the weight object receiving portion to change a shape of itself. The weight object receiving portion includes: a rotational force applying part that applies a rotational force on the weight object as a reaction generated when the weight object is pressed by the shape change; and a rotation prevention part that is located at a position abutting against the weight object when the rotational force is applied and that stops the weight object from being rotated by the rotational force and prevents rotation of the weight object.

What is claimed is: 
     
         1 . A golf club head comprising:
 a weight object; and   a weight object receiving portion that is provided on an outer surface of the golf club head and to which the weight object is attached, wherein   the weight object receiving portion includes a groove,   the weight object includes an outer member, an inner member, and a coupling member that connects the outer member and the inner member,   the groove includes a first wall that is located on one side relative to the coupling member and a second wall that is located on other side relative to the coupling member,   the first wall includes: a first erecting surface that faces the other side; and a downward-facing surface that is located on a lower side of the first erecting surface and extends toward the one side beyond a position of the first erecting surface,   the second wall includes: a second erecting surface that faces the one side; and an upward-facing surface that is located on an upper side of the second erecting surface and extends toward the other side beyond a position of the second erecting surface,   the outer member includes an other-side extending portion that extends further toward the other side than an other-side end of the inner member,   the inner member includes a one-side extending portion that extends further toward the one side than a one-side end of the outer member, and   in a fixed state in which the weight object is fixed to the groove, the other-side extending portion of the outer member is located on the upper side of the upward-facing surface, the upward-facing surface abuts the outer member from the lower side, the one-side extending portion of the inner member is located on the lower side of the downward-facing surface, the downward-facing surface abuts the inner member from the upper side, the one-side end of the outer member abuts the first erecting surface, and the other-side end of the inner member abuts the second erecting surface.   
     
     
         2 . The golf club head according to  claim 1 , wherein
 the outer member includes a first lower surface that is located on the one side relative to the coupling member, and a second lower surface that is located on the other side relative to the coupling member, and the second lower surface includes a lower surface of the other-side extending portion,   the inner member includes a first upper surface that is located on the one side relative to the coupling member, and a second upper surface that is located on the other side relative to the coupling member, and the first upper surface includes an upper surface of the one-side extending portion, and   in the fixed state, the first lower surface does not abut the first wall or the second wall of the groove, and the second upper surface does not abut the first wall or the second wall of the groove.   
     
     
         3 . The golf club head according to  claim 1 , wherein
 the downward-facing surface extends toward the one side from a lower end of the first erecting surface, and   the upward-facing surface extends toward the other side from an upper end of the second erecting surface.   
     
     
         4 . The golf club head according to  claim 1 , wherein
 a shortest distance between the first erecting surface and the second erecting surface is denoted by D 1 ,   a width between the one-side end of the outer member and the other-side end of the inner member is denoted by W 1 , the width W 1  being measured in a direction perpendicular to a rotational center line of the coupling member,   the width W 1  is smaller than the shortest distance D 1 , and   in the fixed state, the weight object is fixed to the groove such that the weight object is inclined toward the one side.   
     
     
         5 . The golf club head according to  claim 1 , wherein
 a shortest distance between the first erecting surface and the second erecting surface is denoted by D 1 ,   a width between the one-side end of the outer member and the other-side end of the inner member is denoted by W 1 , the width W 1  being measured in a direction perpendicular to a rotational center line of the coupling member,   the width W 1  is equal to the shortest distance D 1 , and   in the fixed state, the weight object is fixed to the groove such that the weight object is not inclined.   
     
     
         6 . The golf club head according to  claim 1 , wherein
 a shortest distance between the first erecting surface and the second erecting surface is denoted by D 1 ,   a width between the one-side end of the outer member and the other-side end of the inner member is denoted by W 1 , the width W 1  being measured in a direction perpendicular to a rotational center line of the coupling member,   the width W 1  is greater than the shortest distance D 1 , and   in the fixed state, the weight object is fixed to the groove such that the weight object is inclined toward the other side.   
     
     
         7 . The golf club head according to  claim 1 , wherein
 the coupling member is a screw that includes a head portion and a male screw portion,   the head portion is rotatably retained by the outer member,   the inner member includes a female screw hole, and   the male screw portion is screw-connected to the female screw hole.   
     
     
         8 . The golf club head according to  claim 7 , wherein
 the fixed state is achieved by tightening the screw,   an unfixed state in which the weight object is not fixed to the groove is achieved by loosening the screw, and   the unfixed state includes a state in which the weight object does not fall out of the groove.   
     
     
         9 . The golf club head according to  claim 7 , wherein
 the fixed state is achieved by tightening the screw,   an unfixed state in which the weight object is not fixed to the groove is achieved by loosening the screw, and   the groove allows the weight object in the unfixed state to move in the groove.