Patent Publication Number: US-11642579-B2

Title: Golf club head

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application claims priority to Japanese Patent Application No. 2021-041039 filed on Mar. 15, 2021. The entire contents of this Japanese Patent Application are hereby incorporated by reference. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a golf club head. 
     Description of the Related Art 
     There has been known a golf club head in which the position of the center of gravity of the head can be adjusted. JP2011-010722 A discloses a golf club head including a weight body that can move on a guide groove. 
     SUMMARY 
     The inventor of the present disclosure has found a new structure capable of adjusting the position of the center of gravity of a head. This new structure exhibits new advantageous effects brought by the structure. 
     The present disclosure provides a golf club head having a new structure that includes a mechanism of adjusting the center of gravity of the head. 
     In one aspect, a golf club head according to the present disclosure includes a face portion, a crown portion, and a sole portion. This head includes a weight member that is configured to be wound, a first wound portion around which a first part of the weight member is to be wound, and a second wound portion that is disposed apart from the first wound portion and around which a second part of the weight member is to be wound. The position of a center of gravity of the head is adjusted by changing a weight ratio of the first part to the second part. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a plan view of a head according to a first embodiment; 
         FIG.  2    is a bottom view of the head in  FIG.  1   ; 
         FIG.  3 A  is a cross sectional view taken along line A-A in  FIG.  2   ,  FIG.  3 B  is a cross sectional view taken along line B-B in  FIG.  2   , and  FIG.  3 C  is a cross-sectional view taken along lines C-C in  FIG.  3 A  and  FIG.  3 B ; 
         FIG.  4 A  is a cross-sectional view of a first wound portion b 1  and its vicinity according to a first modification example,  FIG.  4 B  is a cross-sectional view of a second wound portion b 2  and its vicinity according to the first modification example, and  FIG.  4 C  is a cross-sectional view taken along lines C-C in  FIG.  4 A  and  FIG.  4 B ; 
         FIG.  5 A  and  FIG.  5 B  are cross-sectional views of a first wound portion b 1 , a second wound portion b 2  and their vicinity according to a second modification example, and also shows cross-sectional views taken along line A-A and line B-B, the first wound portion b 1  (second wound portion b 2 ) in  FIG.  5 A  being situated at a pushed-in position, and the first wound portion b 1  (second wound portion b 2 ) in  FIG.  5 B  being situated at a projecting position; 
         FIG.  6    is a cross-sectional view showing an alternate mechanism according to the second modification example; 
         FIG.  7    is a bottom view of a head according to a second embodiment; 
         FIG.  8    is a bottom view of a head according to a third embodiment; 
         FIG.  9    is a bottom view of a head according to a fourth embodiment; 
         FIG.  10    is a bottom view of a head according to a fifth embodiment; 
         FIG.  11    is a bottom view of a head according to a sixth embodiment; 
         FIG.  12    is a bottom view of a head according to a seventh embodiment; 
         FIG.  13 A  is a plan view of a head according to an eighth embodiment, and  FIG.  13 B  is a bottom view thereof; 
         FIG.  14    is a plan view of a head according to a ninth embodiment; 
         FIG.  15 A  is a plan view of a head according to a tenth embodiment, and  FIG.  15 B  is a bottom view thereof; 
         FIG.  16 A  is a plan view of a head according to an eleventh embodiment, and  FIG.  16 B  is a bottom view thereof; 
         FIG.  17    is a bottom view of a head according to a twelfth embodiment; 
         FIG.  18 A  is a cross sectional view taken along line A-A in  FIG.  17   ,  FIG.  18 B  is a cross sectional view taken along line B-B in  FIG.  17   , and  FIG.  18 C  is a cross-sectional view taken along lines C-C in  FIG.  18 A  and  FIG.  18 B ; 
         FIG.  19    is a perspective view showing a toothed surface forming a locking and tightening mechanism that is an example of a rotation regulating mechanism; 
         FIG.  20    is a side view of the locking and tightening mechanism including the toothed surface in  FIG.  19   ; and 
         FIG.  21    is a conceptual diagram for illustrating a toe-heel direction and a face-back direction. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, embodiments will be described in detail with appropriate references to the accompanying drawings. 
     In the present disclosure, a reference state, a reference perpendicular plane, a face-back direction, a toe-heel direction, and an up-down direction are defined as follows. The reference state is defined as a state where a head is placed at a predetermined lie angle and real loft angle on a horizontal plane HP. As shown in  FIG.  21   , in the reference state, a center line Z of a hosel hole is contained in a plane VP that is perpendicular to the horizontal plane HP. The plane VP is defined as the reference perpendicular plane. The predetermined lie angle and real loft angle are shown in a product catalog, for example. 
     In the present disclosure, the toe-heel direction is the direction of an intersection line NL between the reference perpendicular plane VP and the horizontal plane HP (see  FIG.  21   ). 
     In the present disclosure, the face-back direction is a direction that is perpendicular to the toe-heel direction and is parallel to the horizontal plane HP. 
     In the present disclosure, the up-down direction is a direction that is perpendicular to the toe-heel direction and is perpendicular to the face-back direction. In other words, the up-down direction in the present disclosure is a direction perpendicular to the horizontal plane HP. 
     In the present disclosure, a face center Fc is defined. The face center Fc is determined in the following manner. First, a point Pr is selected roughly at the center of a face outer surface in the up-down direction and the toe-heel direction. Next, a plane that passes through the point Pr, extends in the direction of a line normal to the face outer surface at the point Pr, and is parallel to the toe-heel direction is determined. An intersection line between this plane and the face outer surface is drawn, and a midpoint Px of this intersection line is determined. Next, a plane that passes through the midpoint Px, extends in the direction of a line normal to the face outer surface at the midpoint Px, and is parallel to the up-down direction is determined. An intersection line between this plane and the face outer surface is drawn, and a midpoint Py of this intersection line is determined. Next, a plane that passes through the midpoint Py, extends in the direction of a line normal to the face outer surface at the midpoint Py, and is parallel to the toe-heel direction is determined. An intersection line between this plane and the face outer surface is drawn, and a midpoint Px of this intersection line is newly determined. Next, a plane that passes through this newly-determined midpoint Px, extends in the direction of a line normal to the face outer surface at this midpoint Px, and is parallel to the up-down direction is determined. An intersection line between this plane and the face outer surface is drawn, and a midpoint Py of this intersection line is newly determined. By repeating the above-described steps, points Px and Py are sequentially determined. In the course of repeating these steps, when the distance between a newly-determined midpoint Py and a midpoint Py determined in the immediately preceding step first becomes less than or equal to 0.5 mm, the newly-determined midpoint Py (the midpoint Py determined last) is defined as the face center Fc. 
       FIG.  1    is a plan view of a golf club head  2  according to a first embodiment as viewed from a crown side.  FIG.  2 A  is a bottom view of the head  2  as viewed from a sole side.  FIG.  3 A  is a cross-sectional view taken along line A-A in  FIG.  2   .  FIG.  3 B  is a cross-sectional view taken along line B-B in  FIG.  2   .  FIG.  3 C  is a cross-sectional view taken along lines C-C in  FIG.  3 A  and  FIG.  3 B . 
     The head  2  (head body h 1 ) includes a face portion  4 , a crown portion  6 , a sole portion  8 , and a hosel portion  10 . The face portion  4  includes a face outer surface  4   a  and a face inner surface  4   b  (not shown in the drawings). The face outer surface  4   a  is a surface for hitting a ball. The face outer surface  4   a  has a face center Fc. The crown portion  6  includes a crown outer surface  6   a  and a crown inner surface (not shown in the drawings). The sole portion  8  includes a sole outer surface  8   a  and a sole inner surface  8   b  (see  FIG.  3 A ). The hosel portion  10  has a hosel hole  12 . The head  2  is a wood-type golf club head. 
     The head  2  includes a first wound portion b 1 , a second wound portion b 2 , and a weight member wt. The first wound portion b 1  and the second wound portion b 2  are attached to the head body h 1 , and the weight member wt is stretched between the first wound portion b 1  and the second wound portion b 2 . In the present embodiment, the sole portion  8  includes the first wound portion b 1  and the second wound portion b 2 . The first wound portion b 1  and the second wound portion b 2  are connected to each other by the weight member wt. The first wound portion b 1  is provided at a toe-side position with respect to the second wound portion b 2 . The first wound portion b 1  is provided at a toe-side position with respect to the face center Fc. The second wound portion b 2  is provided at a heel-side position with respect to the face center Fc. 
     The weight member wt has a long and thin shape. The length of the weight member wt is set such that the weight member wt can connect the first wound portion b 1  and the second wound portion b 2 , and have a first part wt 1  to be wound around the first wound portion b 1  or a second part wt 2  to be wound around the second wound portion b 2 . Examples of the shape of the weight member wt include a wire shape and a belt shape. Examples of the wire-shaped weight member wt include a string, a piece of wire, a metal wire, and wire. The wire is a concept that includes a piece of wire and a wire rope obtained by twisting wires together. The weight member wt may be a chain, for example. The material of the weight member wt is not limited. The weight member wt preferably has a large specific gravity. From the viewpoint of specific gravity and easy winding, a resin containing metal and metal powder is preferable as the material of the weight member wt. Specific examples of the material of the weight member wt include stainless steel, a tungsten nickel alloy, a resin material containing stainless steel, and a resin material containing a tungsten nickel alloy. 
     In a single weight member wt, its weight per unit length may be constant or may vary. 
     As shown in  FIG.  3 A , the first wound portion b 1  includes a reel portion  20  and a center shaft  22 . The reel portion  20  constitutes a reel (spool). The reel portion  20  is fixed to the center shaft  22 . The reel portion  20  can rotate about the center shaft  22 . The weight member wt is wound around the first wound portion b 1  (reel portion  20 ). Of the weight member wt, a portion that is wound around the first wound portion b 1  is referred to as the first part wt 1 . The length (length in the longitudinal direction) of the first part wt 1  varies depending on how much the weight member wt is wound around the first wound portion b 1 . The weight of the first part wt 1  varies depending on how much the weight member wt is wound around the first wound portion b 1 . 
     The first wound portion b 1  has an engaging hole  24 . The engaging hole  24  is shaped so as to engage with the tip portion of a tool that is used to rotate the first wound portion b 1 . The tool is a screw driver, for example. The first wound portion b 1  can be rotated by this tool. 
     The first wound portion b 1  can rotate in a reel-in direction and a reel-out direction. When the first wound portion b 1  rotates in the reel-in direction, the weight member wt is wound around the first wound portion b 1 , and the length of the first part wt 1  increases. When the first wound portion b 1  rotates in the reel-out direction, the weight member wt is unwound from the first wound portion b 1 , and the length of the first part wt 1  decreases. 
     The configuration of the second wound portion b 2  is the same as that of the first wound portion b 1 . As shown in  FIG.  3 B , the second wound portion b 2  includes a reel portion  20  and a center shaft  22 . The reel portion  20  constitutes a reel (spool). The reel portion  20  is fixed to the center shaft  22 . The reel portion  20  can rotate about the center shaft  22 . The weight member wt is wound around the second wound portion b 2  (reel portion  20 ). Of the weight member wt, a portion that is wound around the second wound portion b 2  is referred to as the second part wt 2 . The length (length in the longitudinal direction) of the second part wt 2  varies depending on how much the weight member wt is wound around the second wound portion b 2 . The weight of the second part wt 2  varies depending on how much the weight member wt is wound around the second wound portion b 2 . 
     The second wound portion b 2  can rotate in the reel-in direction and the reel-out direction. When the second wound portion b 2  rotates in the reel-in direction, the weight member wt is wound around the second wound portion b 2 , and the length of the second part wt 2  increases. When the second wound portion b 2  rotates in the reel-out direction, the weight member wt is unwound from the second wound portion b 2 , and the length of the second part wt 2  decreases. 
     The rotation of the first wound portion b 1  and the rotation of the second wound portion b 2  can be linked together by the weight member wt. When a rotation force is applied to the first wound portion b 1  to rotate the first wound portion b 1  in the reel-in direction, this rotation can involve the rotation of the second wound portion b 2  in the reel-out direction. When a rotation force is applied to the second wound portion b 2  to rotate the second wound portion b 2  in the reel-in direction, this rotation can involve the rotation of the first wound portion b 1  in the reel-out direction. This linkage provides easier adjustability of the position of the center of gravity of the head. 
     The weight member wt includes a third part wt 3 . The third part wt 3  is a portion that is not wound around any wound portion b 1  or b 2 . In the present embodiment, the third part wt 3  is a part located between the first part wt 1  and the second part wt 2 . 
     When the third part wt 3  is pulled by the first wound portion b 1  and the second wound portion b 2 , a tension can be applied to the third part wt 3 . When the tension is applied to the third part wt 3 , the length of the third part wt 3  is substantially constant. When the tension is not applied to the third part wt 3 , the third part wt 3  might go slack. 
     The second wound portion b 2  has an engaging hole  24 . The engaging hole  24  is shaped so as to engage with the tip portion of a tool that is used to rotate the second wound portion b 2 . The tool is a screw driver, for example. This tool can be also used as the tool for rotating the first wound portion b 1 . 
     As shown in  FIG.  3 C , the first wound portion b 1  includes a rotation resistance mechanism  30 . The rotation resistance mechanism  30  includes a rotary gear  32  and a gear engaging portion  34 . The rotary gear  32  is fixed to the center shaft  22  and rotates together with the reel portion  20 . The gear engaging portion  34  engages with teeth  32   a  of the rotary gear  32 . This engagement prevents the rotation of the rotary gear  32 . When the rotary gear  32  is about to rotate, the rotary gear  32  applies a stress on the gear engaging portion  34 . The gear engaging portion  34  is elastically deformed by the stress applied from the rotary gear  32 . When the magnitude of the stress from the rotary gear  32  exceeds a predetermined value, the degree of the elastic deformation of the gear engaging portion  34  increases, and the gear engaging portion  34  gets over one of the teeth  32   a . By repeating the elastic deformation, the rotary gear  32  rotates while receiving the rotational resistance. The rotation resistance mechanism  30  applies a same magnitude of resistance force to the rotation of the rotary gear  32  in the reel-in direction and the rotation of the rotary gear  32  in the reel-out direction. 
     The second wound portion b 2  also includes the same rotation resistance mechanism  30  as in the first wound portion b 1 . 
     When the first wound portion b 1  is rotated in the reel-in direction, the weight of the first part wt 1  increases and the weight of the second part wt 2  decreases. That is, the weight of the weight member wt is distributed largely to the first part wt 1 . As a result, the position of the center of gravity of the head  2  is shifted toward the first wound portion b 1 . In the present embodiment, the position of the center of gravity of the head  2  is shifted toward the toe side. 
     When the second wound portion b 2  is rotated in the reel-in direction, the weight of the second part wt 2  increases and the weight of the first part wt 1  decreases. That is, the weight of the weight member wt is distributed largely to the second part wt 2 . As a result, the position of the center of gravity of the head  2  is shifted toward the second wound portion b 2 . In the present embodiment, the position of the center of gravity of the head  2  is shifted to the heel side. 
     The rotation resistance mechanism  30  contributes to keeping the tension applied to the third part wt 3 . 
     The head  2  includes a first port p 1  and a second port p 2 . The head body h 1  of the head  2  includes the first port p 1  and the second port p 2 . In the present embodiment, the first port p 1  and the second port p 2  are provided in the sole portion  8 . As shown in  FIG.  3 A , the first port p 1  houses the first wound portion b 1 . The first wound portion b 1  does not protrude further outward of the head  2  than the sole outer surface  8   a . As shown in  FIG.  3 B , the second port p 2  houses the second wound portion b 2 . The second wound portion b 2  does not protrude further outward of the head  2  than the sole outer surface  8   a.    
     The head  2  has a housing recess p 3 . The housing recess p 3  extends from the first port p 1  to the second port p 2 . The housing recess p 3  constitutes a groove. The housing recess p 3  houses the third part wt 3 . As long as the tension is applied to the third part wt 3 , the third part wt 3  is housed in the housing recess p 3 . Since the third part wt 3  is housed in the housing recess p 3 , the third part wt 3  is disposed inside the sole outer surface  8   a.    
       FIG.  4 A  is an enlarged cross-sectional view showing a first wound portion b 1  and its vicinity according to a first modification example, and  FIG.  4 B  is an enlarged cross-sectional view showing a second wound portion b 2  and its vicinity according to the first modification example.  FIG.  4 C  is a cross-sectional view taken along lines C-C in  FIG.  4 A  and  FIG.  4 B . A head of the first modification example is the same as the head  2  of the first embodiment except for structures described below. 
     In the first modification example, a ratchet mechanism  40  is provided instead of the rotation resistance mechanism  30 . The first wound portion b 1  and the second wound portion b 2  each have the ratchet mechanism  40 . 
     The ratchet mechanism  40  includes a rotary gear  42  and a gear engaging portion  44 . The rotary gear  42  rotates together with the reel portion  20 . The gear engaging portion  44  constitutes a switching cam. The gear engaging portion  44  includes a first engaging portion  44   a  and a second engaging portion  44   b . The gear engaging portion  44  is structured such that mutual transition (switching) between a first state in which the first engaging portion  44   a  engages with the rotary gear  42  and a second state in which the second engaging portion  44   b  engages with the rotary gear  42  can be performed. That is, the gear engaging portion  44  can switch between the first state and the second state.  FIG.  4 C  shows the first state. The first state allows the rotary gear  42  to rotate in a first direction R 1 , and prevents the rotary gear  42  from rotating in a second direction R 2 . The second state allows the rotary gear  42  to rotate in the second direction R 2 , and prevents the rotary gear  42  from rotating in the first direction R 1 . The first direction R 1  is the reel-in direction, and the second direction R 2  is the reel-out direction. This ratchet mechanism can change the rotation direction between the reel-in direction and the reel-out direction. The ratchet mechanism is used, for example, in a ratchet handle for fastening a nut and a bolt. 
     For rotating the first wound portion b 1  in the reel-in direction, the first wound portion b 1  is set to the first state, the second wound portion b 2  is set to the second state, and then the first wound portion b 1  is rotated in the reel-in direction. For rotating the second wound portion b 2  in the reel-in direction, the second wound portion b 2  is set to the first state, the first wound portion b 1  is set to the second state, and then the second wound portion b 2  is rotated in the reel-in direction. The slack of the third part wt 3  can be taken up by setting both the first wound portion b 1  and the second wound portion b 2  to the first state, and rotating the first wound portion b 1  or the second wound portion b 2  in the reel-in direction. 
       FIG.  5 A  and  FIG.  5 B  are enlarged cross-sectional views each showing a first wound portion b 1  and its vicinity according to a second modification example. In  FIG.  5 A , the first wound portion b 1  is situated at a pushed-in position. At the pushed-in position, the first wound portion b 1  is housed in a first port p 1 .  FIG.  5 A  also shows a cross-sectional view taken along line A-A. In  FIG.  5 B , the first wound portion b 1  is situated at a projecting position.  FIG.  5 B  also shows a cross-sectional view taken along line B-B. 
     In this second modification example, the configuration of the second wound portion b 2  is the same as that of the first wound portion b 1 .  FIG.  5 A  and  FIG.  5 B  also show enlarged sectional views of the second wound portion b 2  and its vicinity in the second modification example. 
     In the second modification example, a rotation prevention mechanism  50  and an alternate mechanism  60  are provided instead of the rotation resistance mechanism  30 . In addition, in this modification example, a reel portion  70  is provided instead of the reel portion  20 . The first wound portion b 1  includes the rotation prevention mechanism  50 , the alternate mechanism  60 , and the reel portion  70 . The second wound portion b 2  includes the rotation prevention mechanism  50 , the alternate mechanism  60 , and the reel portion  70 . The head of the second modification example is the same as the head  2  of the first embodiment except for structures described below. 
     The reel portion  70  is not fixed to a rotation supporting shaft  72 . The reel portion  70  is rotatably supported by the rotation supporting shaft  72 . The reel portion  70  can rotate with respect to the rotation supporting shaft  72 . The reel portion  70  is fixed to the rotation supporting shaft  72  through a bearing  74 . 
     The rotation prevention mechanism  50  includes a rotary gear  52  and a gear engaging portion  54 . The gear engaging portion  54  constitutes a rotation preventing portion that engages with teeth  52   a  of the rotary gear  52  to prevent the rotation of the rotary gear  52 . The rotary gear  52  is provided in the reel portion  70 . 
     As shown in  FIG.  5 A , when the first wound portion b 1  is situated at the pushed-in position, the rotary gear  52  engages with the gear engaging portion  54 , which prevents the rotation of the first wound portion b 1 . As shown in  FIG.  5 B , when the first wound portion b 1  is situated at the projecting position, the rotary gear  52  does not engage with the gear engaging portion  54 , which allows the rotation of the first wound portion b 1 . 
     When the first wound portion b 1  situated at the pushed-in position is pushed, the first wound portion b 1  is shifted to the projecting position, and the first wound portion b 1  stays at the projecting position even after stopping pushing the first wound portion b 1 . When the first wound portion b 1  situated at the projecting position is pushed, the first wound portion b 1  is shifted to the pushed-in position, and the first wound portion b 1  stays at the pushed-in position even after stopping pushing the first wound portion b 1 . Such an action (motion) of the first wound portion b 1  is also referred to as an alternate action. The alternate mechanism  60  enables the first wound portion b 1  to perform the alternate action. The alternate mechanism  60  is configured such that a mutual transition (switching) between the pushed-in position and the projecting position can be performed. The first wound portion b 1  situated at the pushed-in position does not protrude further outward than the sole outer surface  8   a . The first wound portion b 1  situated at the projecting position protrudes further outward than the sole outer surface  8   a.    
     The pushing of the first wound portion b 1  can be achieved by pushing the first wound portion b 1  with a finger, for example. The mutual transition of the first wound portion b 1  between the pushed-in position and the projecting position can be achieved by simply pushing the first wound portion b 1  with a finger. Every time the first wound portion b 1  is pushed, the switching of the first wound portion b 1  between the pushed-in position and the projecting position is performed. 
       FIG.  6    shows a cross-sectional view of the alternate mechanism  60 . An upper part in  FIG.  6    shows a cross-sectional view when the first wound portion b 1  (second wound portion b 2 ) is situated at the pushed-in position. A lower part in  FIG.  6    is a cross-sectional view when the first wound portion b 1  (second wound portion b 2 ) is situated at the projecting position. 
     The alternate mechanism  60  includes a heart-shaped cam  62 , a pin  64 , a biasing member  66 , and a moving portion  68 . The cam  62  is fixed to the moving portion  68 . The pin  64  is made of a metal and a rod-shaped member. 
     The pin  64  is fixed in a cantilever state in which an end portion (lower end portion in  FIG.  6   ) of the pin  64  on a farther side from the cam  62  is supported. An end portion  64   a  (upper end portion in  FIG.  6   ) of the pin  64  on a closer side to the cam  62  is a free end. The free end  64   a  is provided with an engaging portion  64   b  that engages with the cam  62 . A drawing within a circle in  FIG.  6    shows the free end  64   a  as viewed from another angle, and also shows the engaging portion  64   b . An angled end portion  64   a  of the pin  64  forms the engaging portion  64   b . When a main portion  64   c  of the pin  64  is bent by an external force, the main portion  64   c  of the pin  64  tends to return to a natural state (a straightly extending state). 
     The biasing member  66  is a compression coil spring. The biasing member  66  biases the moving portion  68  upward at all times. The biasing member  66  biases the moving portion  68  at all times in a direction in which the cam  62  moves away from the pin  64 . 
     The rotation supporting shaft  72  is fixed to the moving portion  68 . The first wound portion b 1  moves in conjunction with the movement of the moving portion  68 . The first wound portion b 1  moves together with the moving portion  68 . 
     The cam  62  includes a first guide surface  62   a , a recess  62   b , and a second guide surface  62   c . A pin guiding portion  63  is provided in the vicinity of the cam  62 . 
     When the pin  64  engages with the cam  62 , the first wound portion b 1  stays at the pushed-in position while resisting the biasing force of the biasing member  66  (see upper part of  FIG.  6   ). When the engagement between the pin  64  and the cam  62  is released, the first wound portion b 1  is shifted to the projecting position because of the biasing force of the biasing member  66  (see lower part of  FIG.  6   ). 
     When the first wound portion b 1  situated at the projecting position is pushed, the cam  62  located apart from the pin  64  comes closer to the pin  64 . The engaging portion  64   b  of the pin  64  abuts on the first guide surface  62   a  of the cam  62 , is guided by the first guide surface  62   a , and is also guided by the pin guiding portion  63  to reach the recess  62   b . The engaging portion  64   b  engages with the recess  62   b , whereby the first wound portion b 1  is shifted to and kept at the pushed-in position (see upper part of  FIG.  6   ). 
     When the first wound portion b 1  situated at the pushed-in position is pushed, the engaging portion  64   b  comes off the recess  62   b  since the pin  64  tends to return to its natural state from elastically deformed state, moves along the second guide surface  62   c , and moves away from the cam  62 . As a result, the first wound portion b 1  returns to the projecting position. 
     As described above, in the present embodiment, the heart-shaped cam mechanism is adopted as the alternate mechanism  60 . Examples of the alternate mechanism  60  include known mechanisms such as a rotary cam mechanism and a ratchet cam mechanism in addition to a heart-shaped cam mechanism. 
       FIG.  7    is a bottom view of a head  100  according to a second embodiment as viewed from the sole side. In the head  100 , each reel portion  20  of a first wound portion b 1  and a second wound portion b 2  has transparency. In the head  100 , a first part wt 1  that is wound around the first wound portion b 1  is visually recognized from the outside of the head  100 . In the head  100 , a second part wt 2  that is wound around the second wound portion b 2  can be visually recognized from the outside of the head  100 . Except for the above-described structures, the head  100  is the same as the head  2 . The head  100  does not have a first wound portion b 1  or a second wound portion b 2  in the crown portion. 
       FIG.  8    is a bottom view of a head  110  according to a third embodiment as viewed from the sole side. In the head  110 , a notch  20   a  is provided in each reel portion  20  of a first wound portion b 1  and a second wound portion b 2 . A first part wt 1  that is wound around the first wound portion b 1  is visually recognized from the outside of the head  110  through the notch  20   a . A second part wt 2  that is wound around the second wound portion b 2  can be visually recognized from the outside of the head  110  through the notch  20   a . Except for the above-described structures, the head  110  is the same as the head  2 . The head  110  does not have a first wound portion b 1  or a second wound portion b 2  in the crown portion. 
       FIG.  9    is a bottom view of a head  120  according to a fourth embodiment as viewed from the sole side. The head  120  (sole portion  8 ) includes a first wound portion b 1 , a first port p 1  that houses the first wound portion b 1 , a second wound portion b 2 , and a second port p 2  that houses the second wound portion b 2 . The head  120  (sole portion  8 ) further includes a projection t 1  and a projection t 2 . The projection t 1  and the projection t 2  are disposed on the heel side with respect to the first wound portion b 1 . The projection t 1  and the projection t 2  are disposed on the toe side with respect to the second wound portion b 2 . The projection t 1  and the projection t 2  are erected columns. The number of the projections may be one, but is preferably two or more. 
     A weight member wt can be wound around the projection t 1 . The weight member wt can be wound around the projection t 2 . Each of the projection t 1  and the projection t 2  is relatively thin. Accordingly, when the weight member wt is wound around each of the projection t 1  and the projection t 2 , the length of a portion wound around the projection(s) is not efficiently increased. As shown in  FIG.  9   , in the present embodiment, the weight member wt is wound around the projection t 1  and the projection t 2  so as to be stretched from the projection t 1  to the projection t 2 . By winding the weight member wt in this manner, the length of a part (hereinafter referred to as a projection wound portion wt 31 ) of the weight member wt that is wound around the projection t 1  and the projection t 2  can be increased. The weight member wt can be wound in various forms. 
     In the head  120  (the sole portion  8 ), the weight member wt includes a first part (not shown) that is wound around the first wound portion b 1 , a second part (not shown) that is wound around the second wound portion b 2 , and a third part wt 3  that is a portion other than the first part or the second part. The third part wt 3  includes the projection wound portion wt 31  wound around the projections t 1  and t 2 , an extension portion wt 32  that extends from the projection wound portion wt 31  to the first wound portion b 1  (first part wt 1 ), and an extension portion wt 33  that extends from the projection wound portion wt 31  to the second wound portion b 2  (second part wt 2 ). 
     A housing recess p 3  houses (the entirety of) the third part wt 3 . The housing recess p 3  includes a first recess p 31  that houses the projection t 1 , the projection t 2  and the projection wound portion wt 31 , a second recess p 32  that houses the extension portion wt 32 , and a third recess p 33  that houses the extension portion wt 33 . Neither the projection t 1  nor the projection t 2  protrudes further outward than the sole outer surface  8   a . The third part wt 3  does not protrude further outward than the sole outer surface  8   a.    
     Except for the above-described structures, the head  120  is the same as the head  2 . The head  120  does not have a first wound portion b 1  or a second wound portion b 2  in the crown portion. 
       FIG.  10    is a bottom view of a head  130  according to a fifth embodiment as viewed from the sole side. The head  130  (sole portion  8 ) includes a first wound portion b 1 , a first port p 1  that houses the first wound portion b 1 , a second wound portion b 2 , and a second port p 2  that houses the second wound portion b 2 . The head  130  (sole portion  8 ) further includes a projection t 1 , a projection t 2 , a projection t 3 , and a projection t 4 . The projection t 1  and the projection t 2  are disposed on the toe side with respect to the projection t 3  and the projection t 4 . The projection t 1  and the projection t 2  are disposed on the face side of the first wound portion b 1 . The projection t 3  and the projection t 4  are disposed on the face side of the second wound portion b 2 . 
     In the head  130  (sole portion  8 ), the weight member wt includes a first part (not shown) that is wound around the first wound portion b 1 , a second part (not shown) that is wound around the second wound portion b 2 , and a third part wt 3  that is a portion other than the first part or the second part. The third part wt 3  includes a projection wound portion wt 31  that is wound around the projections t 1  and t 2 , a projection wound portion wt 32  that is wound around the projections t 3  and t 4 , and an extension portion wt 33  that extends from the first wound portion b 1  (first part wt 1 ) to the second wound portion b 2  (second part wt 2 ). The third part wt 3  further includes an extension portion wt 34  that extends from the projections t 1  and t 2  to the first wound portion b 1 , and an extension portion wt 35  that extends from the projections t 3  and t 4  to the second wound portion b 2 . 
     A housing recess p 3  houses (the entirety of) the third part wt 3 . The housing recess p 3  includes: a first recess p 31  that houses the projection t 1 , the projection t 2  and the projection wound portion wt 31 ; a second recess p 32  that houses the projection t 3 , the projection t 4 , and the projection wound portion wt 32 ; and a third recess p 33  that houses the extension portion wt 33 . The housing recess p 3  further includes a fourth recess p 34  that houses the extension portion wt 34 , and a fifth recess p 35  that houses the extension portion wt 35 . 
     Neither the projection t 1  nor the projection t 2  protrudes further outward than the sole outer surface  8   a . Neither the projection t 3  nor the projection t 4  protrudes further outward than the sole outer surface  8   a . The third part wt 3  does not protrude further outward than the sole outer surface  8   a.    
     Except for the above-described structures, the head  130  is the same as the head  2 . The head  130  does not have a first wound portion b 1  or a second wound portion b 2  in the crown portion. 
       FIG.  11    is a bottom view of a head  140  according to a sixth embodiment as viewed from the sole side. The head  140  (sole portion  8 ) includes a first wound portion b 1  and a second wound portion b 2 . The head  140  (sole portion  8 ) does not have a first port p 1 . The first wound portion b 1  is exposed to the outside of the sole outer surface  8   a . The head  140  (sole portion  8 ) does not have a second port p 2 . The second wound portion b 2  is exposed to the outside of the sole outer surface  8   a.    
     The head  140  (sole portion  8 ) includes a projection t 1 , a projection t 2 , a projection t 3 , and a projection t 4 . The projection t 1 , the projection t 2 , the projection t 3 , and the projection t 4  are disposed on the heel side with respect to the first wound portion b 1 . The projection t 1 , the projection t 2 , the projection t 3 , and the projection t 4  are disposed on the toe side with respect to the second wound portion b 2 . 
     The head  140  (sole portion  8 ) does not have a housing recess p 3  that houses a third part wt 3 . The third part wt 3  protrudes further outward than the sole outer surface  8   a . The projection t 1 , the projection t 2 , the projection t 3 , and the projection t 4  protrude further outward than the sole outer surface  8   a.    
     The third part wt 3  can be wound around at least one of the projection t 1 , the projection t 2 , the projection t 3 , or the projection t 4  at a position located between the first wound portion b 1  (first part wt 1 ) and the second wound portion b 2  (second part wt 2 ). The third part wt 3  may be wound so as to be stretched between two or more projections selected from the group consisting of the projection t 1 , the projection t 2 , the projection t 3 , and the projection t 4 . The third part wt 3  can be wound in various forms using the plurality of projections. 
     Except for the above-described structures, the head  140  is the same as the head  2 . The head  140  does not have a first wound portion b 1  or a second wound portion b 2  in the crown portion. 
       FIG.  12    is a bottom view of a head  150  according to a seventh embodiment as viewed from the sole side. The head  150  (sole portion  8 ) includes a first wound portion b 1  and a second wound portion b 2 . The head  150  (sole portion  8 ) does not have a first port p 1 . The first wound portion b 1  is exposed to the outside of the sole outer surface  8   a . The head  150  (sole portion  8 ) does not have the second port p 2 . The second wound portion b 2  is exposed to the outside of the sole outer surface  8   a . The head  150  (sole portion  8 ) does not have a housing recess p 3 . A weight member wt (third part wt 3 ) that extends from the first wound portion b 1  to the second wound portion b 2  protrudes further outward than the sole outer surface  8   a . The head  150  (sole portion  8 ) does not have a projection around which the weight member wt can be wound. Neither the first wound portion b 1  nor the second wound portion b 2  includes the engaging hole  24 . The first wound portion b 1  and the second wound portion b 2  are non-rotatable. For example, the weight member wt can be wound around the first wound portion b 1  and the second wound portion b 2  with fingers. 
       FIG.  13 A  is a plan view of a head  160  according to an eighth embodiment as viewed from the crown side.  FIG.  13 B  is a bottom view of the head  160  as viewed from the sole side. In the head  160 , a crown portion  6  includes a first wound portion b 1  and a second wound portion b 2 . The crown portion  6  further includes a first port p 1  that houses the first wound portion b 1 , a second port p 2  that houses the second wound portion b 2 , and a housing recess p 3  that extends from the first port p 1  to the second port p 2  and houses a third part wt 3  of a weight member wt. A sole portion  8  does not have a first wound portion b 1  or a second wound portion b 2 . Except for the above-described structures, the head  160  is the same as the head  2 . 
       FIG.  14    is a plan view of a head  170  according to a ninth embodiment as viewed from the crown side. A cover member  172  that covers the first port p 1 , the second port p 2 , and the housing recess p 3  is attached to the head  170 . The cover member  172  is attached to the head  170  by a known method such as fitting or screwing. The cover member  172  may cover at least a part of the first port p 1 , the second port p 2 , or the housing recess p 3 . For example, a first cover member that covers the first port p 1  and a second cover member that covers the second port p 2  may be provided. The head  170  is the same as the head  160  except for the presence of the cover member  172 . 
       FIG.  15 A  is a plan view of a head  180  according to a tenth embodiment as viewed from the crown side.  FIG.  15 B  is a bottom view of the head  180  as viewed from the sole side. In the head  180 , a crown portion  6  includes a first wound portion b 1  and a second wound portion b 2 . The crown portion  6  further includes a first port p 1  that houses the first wound portion b 1 , a second port p 2  that houses the second wound portion b 2 , and a housing recess p 3  that extends from the first port p 1  to the second port p 2  and houses a third part wt 3  of a weight member wt. In addition, a sole portion  8  of the head  180  includes a first wound portion b 1  and a second wound portion b 2 . The sole portion  8  further includes a first port p 1  that houses the first wound portion b 1 , a second port p 2  that houses the second wound portion b 2 , and a housing recess p 3  that extends from the first port p 1  to the second port p 2  and houses a third part wt 3  of a weight member wt. 
       FIG.  16 A  is a plan view of a head  190  according to an eleventh embodiment as viewed from the crown side.  FIG.  16 B  is a bottom view of the head  190  as viewed from the sole side. In the head  190 , a crown portion  6  includes a first wound portion b 1 , and a sole portion  8  includes a second wound portion b 2 . The crown portion  6  includes a first port p 1  that houses the first wound portion b 1 . The sole portion  8  includes a second port p 2  that houses the second wound portion b 2 . A housing recess p 3  extends from the crown portion  6  to the sole portion  8 . The housing recess p 3  extends from the first port p 1  located in the crown portion  6  to the second port p 2  located in the sole portion  8 . The housing recess p 3  is a groove that houses a third part wt 3  of a weight member wt. 
       FIG.  17    is a bottom view of a golf club head  200  according to a twelfth embodiment as viewed from the sole side.  FIG.  18 A  is a cross-sectional view taken along line A-A in  FIG.  17   .  FIG.  18 B  is a cross-sectional view taken along line B-B in  FIG.  17   .  FIG.  18 C  is a cross-sectional view taken along lines C-C in  FIG.  18 A  and  FIG.  18 B . 
     The head  200  (head body h 1 ) includes a face portion  4 , a crown portion  6 , a sole portion  8 , and a hosel portion  10 . The plan view of the head  200  as viewed from the crown side is the same as  FIG.  1   . The sole portion  8  includes a sole outer surface  8   a  and a sole inner surface  8   b  (see  FIG.  18 A  and  FIG.  18 B ). 
     The head  200  includes a first wound portion b 1 , a second wound portion b 2 , and a weight member wt. The first wound portion b 1  and the second wound portion b 2  are attached to the head body h 1 , and the weight member wt is stretched between the first wound portion b 1  and the second wound portion b 2 . In the present embodiment, the sole portion  8  includes the first wound portion b 1  and the second wound portion b 2 . The first wound portion b 1  and the second wound portion b 2  are connected to each other by the weight member wt. The first wound portion b 1  is provided on the toe side with respect to the second wound portion b 2 . The first wound portion b 1  is provided on the toe side with respect to the face center Fc. The second wound portion b 2  is provided on the heel side with respect to the face center Fc. 
     The weight member wt has a long and thin shape. The length of the weight member wt is set such that the weight member wt can connect the first wound portion b 1  and the second wound portion b 2 , and have a first part wt 1  to be wound around the first wound portion b 1  or a second part wt 2  to be wound around the second wound portion b 2 . 
     As shown in  FIG.  18 A , the first wound portion b 1  includes a reel portion  20  and a screw  23 . The reel portion  20  constitutes a reel (spool). The screw  23  penetrates through a through hole  20   b  that is formed at the center of the reel portion  20 . Further, the screw  23  is screwed into a female screw hole  25  that is formed in a bottom portion p 11  of a first port p 1 . The reel portion  20  can freely rotate with respect to the screw  23 . 
     The weight member wt is wound around the first wound portion b 1  (reel portion  20 ). Of the weight member wt, a portion that is wound around the first wound portion b 1  is referred to as the first part wt 1 . The length (length in the longitudinal direction) of the first part wt 1  varies depending on how much the weight member wt is wound around the first wound portion b 1 . The weight of the first part wt 1  varies depending on how much the weight member wt is wound around the first wound portion b 1 . 
     The first wound portion b 1  has an engaging hole  24 . The engaging hole  24  is shaped so as to engage with the tip portion of a tool that is used to rotate the first wound portion b 1 . The tool is a screw driver, for example. The first wound portion b 1  can be rotated by this tool. 
     The screw  23  includes a head portion that has a screw hole  27 . The screw hole  27  is shaped so as to engage with the tip portion of a tool that is used to rotate the screw  23 . The tool is a screw driver, for example. The screw  23  can be tightened or loosened with this tool. 
     The configuration of the second wound portion b 2  is the same as that of the first wound portion b 1 . As shown in  FIG.  18 B , the second wound portion b 2  includes a reel portion  20  and a screw  23 . The reel portion  20  constitutes a reel (spool). The reel portion  20  can freely rotate with respect to the screw  23 . The reel portion  20  can rotate about the screw  23 . The weight member wt is wound around the second wound portion b 2  (reel portion  20 ). Of the weight member wt, a portion that is wound around the second wound portion b 2  is referred to as the second part wt 2 . The length (length in the longitudinal direction) of the second part wt 2  varies depending on how much the weight member wt is wound around the second wound portion b 2 . The weight of the second part wt 2  varies depending on how much the weight member wt is wound around the second wound portion b 2 . 
     The rotation of the first wound portion b 1  and the rotation of the second wound portion b 2  can be linked together by the weight member wt. When a rotation force is applied to the first wound portion b 1  to rotate the first wound portion b 1  in the reel-in direction, this rotation can involve the rotation of the second wound portion b 2  in the reel-out direction. When a rotation force is applied to the second wound portion b 2  to rotate the second wound portion b 2  in the reel-in direction, this rotation can involve the rotation of the first wound portion b 1  in the reel-out direction. This linkage provides easier adjustability of the position of the center of gravity of the head. 
     The weight member wt includes a third part wt 3 . The third part wt 3  is a portion that is not wound around any wound portion b 1  or b 2 . In the present embodiment, the third part wt 3  is a part located between the first part wt 1  and the second part wt 2 . 
     The second wound portion b 2  has an engaging hole  24 . The engaging hole  24  is shaped so as to engage with the tip portion of a tool that is used to rotate the second wound portion b 2 . The tool is a screw driver, for example. This tool is also used as the tool for rotating the first wound portion b 1 . 
     As shown in  FIG.  18 C , the first wound portion b 1  includes a rotation resistance mechanism  30 . The rotation resistance mechanism  30  includes a rotary gear  32  and a gear engaging portion  34 . The rotary gear  32  is integrally formed with the reel portion  20  as a single-piece member. The rotary gear  32  rotates together with the reel portion  20 . The gear engaging portion  34  engages with teeth  32   a  of the rotary gear  32 . This engagement prevents the rotation of the rotary gear  32 . When the rotary gear  32  is about to rotate, the rotary gear  32  applies a stress on the gear engaging portion  34 . The gear engaging portion  34  is elastically deformed by the stress applied from the rotary gear  32 . When the magnitude of the stress from the rotary gear  32  exceeds a predetermined value, the degree of the elastic deformation of the gear engaging portion  34  increases, and the gear engaging portion  34  gets over one of the teeth  32   a . By repeating the elastic deformation, the rotary gear  32  rotates while receiving the rotational resistance. The rotation resistance mechanism  30  applies a same magnitude of resistance force to the rotation of the rotary gear  32  in the reel-in direction and the rotation of the rotary gear  32  in the reel-out direction. 
     The second wound portion b 2  also includes the same rotation resistance mechanism  30  as in the first wound portion b 1 . 
     When the first wound portion b 1  is rotated in the reel-in direction, the weight of the first part wt 1  increases and the weight of the second part wt 2  decreases. That is, the weight of the weight member wt is distributed largely to the first part wt 1 . As a result, the position of the center of gravity of the head  200  is shifted toward the first wound portion b 1 . In the present embodiment, the position of the center of gravity of the head  200  is shifted toward the toe side. 
     When the second wound portion b 2  is rotated in the reel-in direction, the weight of the second part wt 2  increases and the weight of the first part wt 1  decreases. That is, the weight of the weight member wt is distributed largely to the second part wt 2 . As a result, the position of the center of gravity of the head  200  is shifted toward the second wound portion b 2 . In the present embodiment, the position of the center of gravity of the head  200  is shifted to the heel side. 
     The rotation resistance mechanism  30  contributes to keeping the tension applied to the third part wt 3 . 
       FIG.  18 A  shows a state in which the screw  23  is tightened and a state in which the screw  23  is loosened. A left-side part of  FIG.  18 A  shows the state in which the screw  23  is tightened. A right-side part of  FIG.  18 A  shows the state in which the screw  23  is loosened. 
     Similarly,  FIG.  18 B  shows a state in which the screw  23  is tightened and a state in which the screw  23  is loosened. A left-side part of  FIG.  18 B  shows the state in which the screw  23  is tightened. A right-side part of  FIG.  18 B  shows the state in which the screw  23  is loosened. 
     As shown in  FIG.  18 A , the rotary gear  32  is pressed against the bottom portion p 11  of the first port p 1  by tightening the screw  23 . The rotation of the first wound portion b 1  (reel portion  20 ) can be stopped by tightening the screw  23 . Slack of the third part wt 3  can be prevented by preventing the rotation of the first wound portion b 1 . Loosening the screw  23  allows the first wound portion b 1  to rotate. 
     As shown in  FIG.  18 B , the rotary gear  32  is pressed against a bottom portion p 21  of a second port p 2  by tightening the screw  23 . The rotation of the second wound portion b 2  (reel portion  20 ) can be stopped by tightening the screw  23 . Slack of the third part wt 3  can be prevented by preventing the rotation of the second wound portion b 2 . Loosening the screw  23  allows the second wound portion b 2  to rotate. 
     As described above, the present embodiment includes a rotation stop mechanisms that prevent the rotations of the wound portions b 1  and b 2 . The rotation stop mechanism can switch between the rotation stopped state and the rotation allowed state by controlling the screw  23 . 
       FIG.  19    is a perspective view showing a toothed surface  210  capable of stopping the rotation of the reel portions  20 . In the twelfth embodiment ( FIG.  18 A  to  FIG.  18 C ), the bottom portions p 11  and P 21  of the respective ports are brought into contact with the corresponding rotary gears  32 , whereby the rotation of the reel portions  20  is stopped. From the viewpoint of ensuring the stop of the rotation of the reel portions  20 , a toothed surface can be formed on the bottom portions p 11  and p 21  of the respective ports and the rotary gears  32 . The effect of the stop of the rotation can be enhanced by engaging these toothed surfaces with each other. The toothed surface  210  is an example of such toothed surfaces. The toothed surface  210  includes first surfaces  212  arranged at predetermined angle intervals in the circumferential direction, and second surfaces  214  arranged each between two adjacent first surfaces  212 . In the circumferential direction, the first surfaces  212  and the second surfaces  214  are alternately arranged. The first surfaces  212  are arranged at equal intervals in the circumferential direction. The second surfaces  214  are arranged at equal intervals in the circumferential direction. Each first surface  212  is an inclined surface. Each first surface  212  is inclined with respect to the axial direction and is inclined with respect to the circumferential direction. Each second surface  214  is parallel to the axial direction and is perpendicular to the circumferential direction. 
       FIG.  20    is a side view showing a state in which the toothed surface  210  engages with an opposed surface. The opposed surface is a toothed surface  220 . The toothed surface  220  is obtained by transferring the toothed surface  210 . The toothed surface  220  includes first surfaces  222  and second surfaces  224 . In the circumferential direction, the first surfaces  222  and the second surfaces  224  are alternately arranged. The first surfaces  222  are arranged at equal intervals in the circumferential direction. The second surfaces  224  are arranged at equal intervals in the circumferential direction. Each first surface  222  is an inclined surface. Each first surface  222  is inclined with respect to the axial direction and is inclined with respect to the circumferential direction. Each second surface  224  is parallel to the axial direction and is perpendicular to the circumferential direction. 
     As shown in  FIG.  20   , when the toothed surface  210  engages with the toothed surface  220  (hereinafter this state is referred to as an engaged state), the first surfaces  212  and corresponding first surfaces  222  are in surface contact with each other, and the second surfaces  214  and corresponding second surfaces  224  are in surface contact with each other. 
     For example, in the embodiment of  FIG.  18 A  to  FIG.  18 C , the toothed surface  210  may be formed on the upper surface of each of the bottom portions p 11  and p 21  of the respective ports, and the toothed surface  220  may be formed on the lower surface of each rotary gear  32 . The contact between the toothed surface  210  and the toothed surface  220  rotates the reel portion  20  in the reel-in direction. That is, when the toothed surface  210  and the toothed surface  220  are brought into contact with each other in a state where the positional relationship in the circumferential direction between these surfaces is different from the above-described engaged state, the contact between the inclined surfaces (contact between first surfaces  212  and corresponding first surfaces  222 ) causes a rotational moment that rotates the reel portion  20  such that these surfaces are brought about the engaged state. This rotation moment rotates the reel portion  20  in the reel-in direction. The toothed surface  210  and the toothed surface  220  constitute a locking and tightening mechanism  226  configured to rotate the reel portion  20  in the reel-in direction and to prevent further rotation of the reel portion  20 . The locking and tightening mechanism  226  enhances the effect of preventing the slack the third part wt 3 . 
     Advantageous Effect 
     The golf club heads shown in the above-described embodiments of the present disclosure exhibit the following advantageous effects. 
     The weight distribution of the weight member wt can be changed by changing the ratio of the amount of the weight member wt wound around the first wound portion b 1  to the amount of the weight member wt wound around the second wound portion b 2 . The position of the center of gravity of the head can be shifted toward the first wound portion b 1  by increasing the amount of the weight member wt wound around the first wound portion b 1 , that is, by increasing the amount of the first part wt 1 . The position of the center of gravity of the head can be shifted toward the second wound portion b 2  by increasing the amount of the weight member wt wound around the second wound portion b 2 , that is, by increasing the amount of the second part wt 2 . The amount of the weight member wt wound around the first wound portion b 1  and the amount of the weight member wt wound around the second wound portion b 2  each are also referred to as a weight-member wound amount. The position of the center of gravity of the head is adjusted by changing the weight-member wound amount of at least either the first part wt 1  or the second part wt 2 . 
     The position of the first wound portion b 1  and the position of the second wound portion b 2  can be freely set. This can realize a desired adjustment of the position of the center of gravity of the head. For example, as shown in the head  2  of  FIG.  2   , when the first wound portion b 1  is disposed on the toe side, and the second wound portion b 2  is disposed on the heel side, then the position of the center of gravity of the head can be adjusted in the toe-heel direction. For example, as shown in the head  190  of  FIGS.  16 A and  16 B , when the first wound portion b 1  is disposed in the crown portion  6 , and the second wound portion b 2  is disposed in the sole portion  8 , then the position of the center of gravity of the head can be adjusted in the up-down direction. Since the position of the first wound portion b 1  and the position of the second wound portion b 2  can be set independently of each other, various adjustments can be made. The degree of freedom of the adjustment can be further increased by disposing a projection(s) in addition to the first wound portion b 1  and the second wound portion b 2 . 
     The position of the center of gravity of the head can be shifted in various directions because of the degree of freedom in the arrangement of the first wound portion b 1 , the second wound portion b 2 , and the projection(s). In the embodiment shown in  FIG.  2   , the position of the center of gravity of the head can be shifted in the toe-heel direction. In the embodiment of  FIG.  16 A  and  FIG.  16 B , the position of the center of gravity of the head can be shifted in the up-down direction. In the embodiment of  FIG.  10   , the position of the center of gravity of the head can be shifted in the face-back direction and the toe-heel direction. For example, in the embodiment of  FIG.  2   , the position of the first wound portion b 1  in the face-back direction may differs from the position of the second wound portion b 2  in the face-back direction. In this case, the position of the center of gravity of the head can be shifted in the toe-heel direction and the face-back direction. For example, in the embodiment of  FIG.  16 A  and  FIG.  16 B , the position of the first wound portion b 1  in the toe-heel direction may differ from the position of the second wound portion b 2  in the toe-heel direction. In this case, the position of the center of gravity of the head can be shifted in the up-down direction and the toe-heel direction. Thus, various adjustments can be made. The weight member wt, which can be wound, enables a head to have various weight distributions because of the flexibility of the weight member wt. 
     Two or more pairs of the first wound portion b 1  and the second wound portion b 2  may be provided. The degree of freedom in adjusting the position of the center of gravity of the head can be further increased by the two or more pairs of them. For example, in the head  180  of  FIG.  15 A  and  FIG.  15 B , a first pair is disposed in the crown portion  6 , and a second pair is disposed in the sole portion  8 , which enables an adjustment with higher degree of freedom. 
     The weight member wt may be replaceable. For example, the weight member wt may be replaced with another weight member wt having a weight per unit length different from that of the former weight member wt. Further, two or more bundled weight members wt may be used. These configurations increase the degree of freedom of the adjustment. 
     The presence of the first port p 1  can prevent the first wound portion b 1  from protruding from the outer surface of the head. The presence of the second port p 2  can prevent the second wound portion b 2  from protruding from the outer surface of the head. The presence of the housing recess p 3  can prevent the third part wt 3  of the weight member wt from protruding from the outer surface of the head. These states in which those portions do not protrude from the head outer surface improve the appearance of the head and reduce air resistance. In addition, in the sole portion  8 , these states reduce ground resistance. 
     In the embodiment of  FIG.  3 A  to  FIG.  3 C , each of the first wound portion b 1  and the second wound portion b 2  can rotate in the reel-in direction and the reel-out direction. Each of the first wound portion b 1  and the second wound portion b 2  has a rotational resistance both when rotated in the reel-in direction and when rotated in the reel-out direction. Neither the first wound portion b 1  nor the second wound portion b 2  rotates when a rotational force (moment) less than a predetermined threshold is applied. Each of the first wound portion b 1  and the second wound portion b 2  rotates when a rotational force equal to or greater than the threshold is applied. This configuration easily achieves a state (hereinafter referred to as a weight fixed state) in which the rotation of the first wound portion b 1  and the rotation of the second wound portion b 2  are prevented while tension is applied to the third part wt 3 . 
     In the embodiment of  FIG.  4 A  to  FIG.  4 C , each of the first wound portion b 1  and the second wound portion b 2  can rotate in the reel-in direction and the reel-out direction. Each of the first wound portion b 1  and the second wound portion b 2  has the ratchet mechanism. The ratchet mechanism can switch the rotation direction between the reel-in direction and the reel-out direction. This configuration easily achieves the weight fixed state in which the rotation of the first wound portion b 1  and the rotation of the second wound portion b 2  are prevented while tension is applied to the third part wt 3 . 
     In the embodiment of  FIG.  5 A  and  FIG.  5 B , each of the first wound portion b 1  and the second wound portion b 2  is configured to perform an alternate action in which each of the first wound portion b 1  and the second wound portion b 2  is independently switched between the projecting position and the pushed-in position by each pushing of the first wound portion b 1  or the second wound portion b 2 . The rotation of the first wound portion b 1  and the rotation of the second wound portion b 2  are allowed when they are at the projecting position, and the rotation of the first wound portion b 1  and the rotation of the second wound portion b 2  are prevented when they are at the pushed-in position. This configuration easily achieves the weight fixed state in which the rotation of the first wound portion b 1  and the rotation of the second wound portion b 2  are prevented while tension is applied to the third part wt 3 . Furthermore, the first wound portion b 1  and the second wound portion b 2  can also be rotated by fingers when they are at the projecting position. 
     Not only the embodiment of  FIG.  5 A,  5 B  but also other embodiments may include the first wound portion b 1  and the second wound portion b 2  each have a switching mechanism capable of switching between a rotation allowed state and a rotation prevented state. In this case, for adjusting the position of the center of gravity of the head, the first wound portion b 1  and the second wound portion b 2  can be set to the rotation allowed state, and for achieving weight fixed state, the first wound portion b 1  and the second wound portion b 2  can be set to the rotation prevented state. 
     In the embodiments of  FIG.  3 A  to  FIG.  3 C ,  FIG.  4 A  to  FIG.  4 C ,  FIG.  5 A ,  FIG.  5 B , and  FIG.  18 A  to  FIG.  18 C , the first wound portion b 1  and the second wound portion b 2  each have a rotation regulating mechanism that regulates the rotation of the first wound portion b 1  or the rotation of the second wound portion b 2  in the reel-out direction. The rotation resistance mechanism  30  ( FIG.  3 C ), the ratchet mechanism  40  ( FIG.  4 C ), the rotation prevention mechanism  50  ( FIG.  5 A ,  FIG.  5 B ), and the rotation stop mechanism ( FIG.  18 A ,  FIG.  18 B ) are examples of the rotation regulating mechanism. The rotation regulating mechanism can easily achieve the weight fixed state in which the third part wt 3  has no slack. Furthermore, in the embodiments shown in  FIG.  18 A  and  FIG.  18 B , since the two kinds of rotation regulating mechanisms are provided, the slack of the third part wt 3  can be effectively suppressed. 
     As described above, the locking and tightening mechanism  226  shown in  FIG.  19    and  FIG.  20    may be applied to the embodiment of  FIG.  18 A  and  FIG.  18 B , for example. Further, the locking and tightening mechanism  226  can be used instead of the rotation prevention mechanism  50  in the embodiment of  FIG.  5 A  and  FIG.  5 B . The locking and tightening mechanism  226  can effectively suppress the slack of the third part wt 3 . 
     As shown in the head  100  of  FIG.  7   , the first part wt 1  and the second part wt 2  can be visually recognized from the outside of the head by imparting transparency to the first wound portion b 1  and the second wound portion b 2 . In the head  110  of  FIG.  8   , the first part wt 1  and the second part wt 2  can be visually recognized from the outside of the head through the notch  20   a . These structures allow the user to see the wound amount of first part wt 1  and the second part wt 2 . 
     When at least either the first part wt 1  or the second part wt 2  can be visually recognized, the wound amount of the other one can be assumed. From this viewpoint, a head that satisfies the following item (a) or (b) is preferable. As in the embodiments shown in  FIG.  7    and  FIG.  8   , a head that satisfy the following (a) and (b) is more preferable. 
     (a) a head configured such that the first part wound around the first wound portion is visually recognized from the outside of the head 
     (b) a head configured such that the second part wound around the second wound portion is visually recognized from the outside of the head 
     The configuration in which the first part wt 1  and the second part wt 2  can be visually recognized from the outside of a head can be achieved by not only the transparency or notch, but also projecting the wound portions b 1  and b 2  from the head outer surface, and widening a gap between the wound portions b 1  and b 2  and the ports p 1  and p 2 , for example. 
     As shown in the heads  120 ,  130 , and  140  of  FIG.  9    to  FIG.  11   , one or more projections around which the third part wt 3  of the weight member wt is wound may be provided in addition to the first wound portion b 1  and the second wound portion b 2 . The degree of freedom of adjustment is further increased by winding the weight member wt around the one or more projections in addition to the first wound portion b 1  and the second wound portion b 2 . 
     As shown in the head  140  of  FIG.  11   , the first wound portion b 1 , the second wound portion b 2 , and the third part wt 3  of the weight member wt may protrude from the head outer surface. The head  140  does not need to include a first port p 1 , a second port p 2 , or a housing recess p 3 . Accordingly, the head body h 1  is easily formed, and the degree of freedom in designing the head body h 1  is increased. In addition, when the first wound portion b 1  and the second wound portion b 2  protrude from the head outer surface as in the head  150  of  FIG.  12   , the first wound portion b 1  and the second wound portion b 2  can be rotated by fingers without using a tool. 
     As in the head  150  of  FIG.  12   , the first wound portion b 1  and the second wound portion b 2  may be non-rotatable. In this case, for example, the weight member wt can be wound around the first wound portion b 1  and the second wound portion b 2  with fingers. Either the first wound portion b 1  or the second wound portion b 2  may be rotatable, and the other may be non-rotatable. From the viewpoint of the adjustability of the position of the center of gravity of the head, each of the first wound portion b 1  and the second wound portion b 2  is preferably rotatable in the reel-in direction and the reel-out direction. 
     In the head  170  of  FIG.  14   , the cover member  172  is provided. This configuration can protect the first wound portion b 1 , the second wound portion b 2 , and the third part wt 3  from the intrusion of foreign matters. In addition, this configuration prevents the first wound portion b 1 , the second wound portion b 2 , and the third part wt 3  from catching grass and the like. The cover member  172  may have transparency. This transparency allows the first wound portion b 1 , the second wound portion b 2 , and/or the third part wt 3  covered with the cover member  172  to be visually recognized from the outside of the head. 
     In a head having a large volume, the first wound portion b 1  and the second wound portion b 2  can be located farther away from each other, and the degree of freedom in the positions of the first wound portion b 1  and the second wound portion b 2  is increased. Accordingly, the adjustable range and the degree of freedom in adjustment of the position of the center of gravity of the head are increased. From these viewpoints, a hollow head having a hollow portion is preferable. From the same viewpoint, the volume of the head is preferably greater than or equal to 100 cc, more preferably greater than or equal to 200 cc, still more preferably greater than or equal to 300 cc, still more preferably greater than or equal to 350 cc, still more preferably greater than or equal to 400 cc, and yet still more preferably greater than or equal to 420 cc. From the viewpoint of golf rules, the head volume is preferably less than or equal to 470 cc, and more preferably less than or equal to 460 cc. 
     Regarding the above-described embodiments, the following clauses are disclosed. 
     Clause 1 
     A golf club head having a face portion, a crown portion and a sole portion, the golf club head including: 
     a weight member that is configured to be wound; 
     a first wound portion around which a first part of the weight member is to be wound; and 
     a second wound portion that is disposed apart from the first wound portion and around which a second part of the weight member is to be wound, wherein 
     a position of a center of gravity of the golf club head is adjusted by changing a weight ratio of the first part to the second part. 
     Clause 2 
     The golf club head according to clause 1, wherein at least either the first wound portion or the second wound portion is rotatable in a reel-in direction and a reel-out direction. 
     Clause 3 
     The golf club head according to clause 1 or 2, wherein the first wound portion and the second wound portion are rotatable in a reel-in direction and a reel-out direction. 
     Clause 4 
     The golf club head according to clause 3, wherein each of the first wound portion and the second wound portion includes a rotation regulating mechanism that regulates the rotation of the first wound portion or the second wound portion in the reel-out direction. 
     Clause 5 
     The golf club head according to any one of clauses 1 to 4, wherein the golf club head further includes: 
     a first port that houses the first wound portion including the first part; 
     a second port that houses the second wound portion including the second part; and 
     a housing recess that houses a third part that is a part of the weight member other than the first part or the second part. 
     Clause 6 
     The golf club head according to any one of clauses 1 to 5, wherein the first wound portion and the second wound portion are disposed in the sole portion. 
     Clause 7 
     The golf club head according to any one of clauses 1 to 5, wherein the first wound portion and the second wound portion are disposed in the crown portion. 
     Clause 8 
     The golf club head according to any one of clauses 1 to 5, wherein 
     the first wound portion is disposed in the sole portion, and 
     the second wound portion is disposed in the crown portion. 
     Clause 9 
     The golf club head according to any one of clauses 1 to 8, wherein the golf club head satisfies the following (a) and/or (b): 
     (a) the golf club head is configured such that the first part wound around the first wound portion is visually recognized from an outside of the golf club head; and 
     (b) the golf club head is configured such that the second part wound around the second wound portion is visually recognized from the outside of the golf club head. 
     Clause 10 
     A golf club head having a face portion, a crown portion and a sole portion, the golf club head including: 
     a weight member that is configured to be wound; 
     a first wound portion around which a first part of the weight member is to be wound; and 
     a second wound portion that is disposed apart from the first wound portion and around which a second part of the weight member is to be wound, wherein 
     a position of a center of gravity of the golf club head is adjusted by changing at least either a wound amount of the first part or a wound amount of the second part. 
     LIST OF REFERENCE NUMERALS 
       2 ,  100 ,  110 ,  120 ,  130 ,  140 ,  150 ,  160 ,  170 ,  180 ,  190 , 
       200  Head 
       4  Face portion 
       4   a  Face outer surface 
       6  Crown portion 
       6   a  Crown outer surface 
       8  Sole portion 
       8   a  Sole outer surface 
       8   b  Sole inner surface 
       10  Hosel portion 
       20  Reel portion 
       20   a  Notch 
       23  Screw 
       24  Engaging hole 
       30  Rotation resistance mechanism 
       40  Ratchet mechanism 
       50  Rotation prevention mechanism 
       60  Alternate mechanism 
       70  Reel portion 
       172  Cover member 
     b 1  First wound portion 
     b 2  Second wound portion 
     p 1  First port 
     p 2  Second port 
     wt Weight member 
     wt 1  First part 
     wt 2  Second part 
     wt 3  Third part 
     The above descriptions are merely illustrative and various modifications can be made without departing from the principles of the present disclosure. 
     The terminology used in the description of the various described embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. The use of the terms “a”, “an”, “the”, and similar referents in the context of throughout this disclosure (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. As used throughout this disclosure, the word “may” is used in a permissive sense (i.e., meaning “having the potential to”), rather than the mandatory sense (i.e., meaning “must”). Similarly, as used throughout this disclosure, the terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted.