Golf club head

Abstract

To provide a new structure capable of moving a weight.SOLUTION: A golf club head 100 includes a head body side v1 having a cavity side h1, a weight side v1 detachably attached to the cavity side w1, and a cover side h1 openably / closably attached to the head body side v1 and covering at least a part of the cavity side c1 in a closed state. The weight side w1 is attached to the cavity side v1 in a state of being slidable in the cavity side v1. In the closed state, the cover side c1 applies a pressing force to the weight side w1. The weight w1 may be fixed to the cavity v1 by a static friction force increased by the pressing force. The cavity v1 may constitute a slide groove.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to golf club heads. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2016-10579 discloses a golf club head including a weight body attached to an opening in a sole portion and at least one adjustment weight detachably attached to the weight body. The weight body is formed to protrude into the interior space of the head. The adjustment weight can move between the opening and the interior space within the weight body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-10579 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors have discovered a new structure that allows the position of the weight to be changed, which provides advantages not available with conventional structures.

[0005] The present disclosure provides a new structure that allows weight to be moved. [Means for solving the problem]

[0006] In one aspect, a golf club head includes a head body having a cavity, a weight removably attached to the cavity, and a cover attached to the head body so as to be openable and closable and covering at least a portion of the cavity in a closed state. The weight is attached to the cavity in a state in which it can slide within the cavity. In the closed state, the cover applies a pressing force to the weight.

[0007] In another aspect, a golf club head includes a head body having a cavity, a weight removably attached to the cavity, and a cover that is attached to the head body in an openable and closable manner and covers at least a portion of the cavity in a closed state. The weight is attached to the cavity in a state that allows it to slide within the cavity. The cover has a cover engagement shape that can engage with the weight at each of a plurality of positions during the sliding movement. The weight has a weight engagement shape that can engage with the cover engagement shape of the cover in the closed state.

[0008] In another aspect, a golf club head includes a head body having a cavity, a weight placed in the cavity, and a cover attached to the head body so as to be able to open and close and cover at least a portion of the cavity in a closed state. The weight is placed in the cavity while being able to slide within the cavity. In the closed state, the cover applies a pressing force to the weight. [Effects of the Invention]

[0009] In one aspect, a new structure can be provided that allows the weight to be moved. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a head according to a first embodiment, as viewed from the crown side. [Figure 2] FIG. 2 is a bottom view of the head of the first embodiment. [Figure 3] FIG. 3 is an exploded perspective view of the head of the first embodiment. [Figure 4] FIG. 4(a) is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 4(b) is a cross-sectional view showing a modified example of FIG. 4(a). [Figure 5] FIG. 5 is a perspective view of the head main body according to the first embodiment. [Figure 6] 6(a) and 6(b) are perspective views showing the movement of the weight in the cavity of the head of FIG. [Figure 7] Fig. 7(a) is a perspective view of the cover of the head of the first embodiment as seen from the outside, and Fig. 7(b) is a perspective view of the cover as seen from the inside. [Figure 8] FIG. 8 is a perspective view showing a weight and a head main body of a modified example. [Figure 9] FIG. 9 is a perspective view showing a weight and a head main body according to another modified example. [Figure 10] FIG. 10 is a perspective view showing a weight and a head main body according to another modified example. [Figure 11] Fig. 11(a) is a perspective view of a modified cover seen from the outside, Fig. 11(b) is a perspective view of the cover seen from the inside, Fig. 11(c) is a perspective view of a weight used with the cover, Fig. 11(d) is a perspective view showing the state in which the cover and weight are engaged, and Fig. 11(e) is a cross-sectional view showing the state in which the cover and weight are attached to the head body. [Figure 12] FIG. 12 is a bottom view of the head of the second embodiment. [Figure 13] FIG. 13 is an exploded perspective view of the head of the second embodiment. [Figure 14]Fig. 14(a) is a perspective view of the cover according to the second embodiment as seen from the outside, Fig. 14(b) is a perspective view of the cover as seen from the inside, Fig. 14(c) is a perspective view of a weight used together with the cover, Fig. 14(d) is an exploded perspective view of the weight, and Fig. 14(e) is a perspective view showing the weight attached to the cover. [Figure 15] FIG. 15 is a bottom view of the head of the third embodiment. [Figure 16] FIG. 16 is an exploded perspective view of the head of the third embodiment. [Figure 17] Fig. 17(a) is a perspective view of the cover according to the third embodiment as seen from the outside, Fig. 17(b) is a perspective view of the cover as seen from the inside, Fig. 17(c) is a perspective view of a weight used with the cover, Fig. 17(d) is an exploded perspective view of the weight, and Fig. 17(e) is a perspective view showing the weight attached to the cover. [Figure 18] FIG. 18 is a bottom view of the head of the fourth embodiment. [Figure 19] FIG. 19 is an exploded perspective view of the head of the fourth embodiment. [Figure 20] Fig. 20(a) is a perspective view of the cover according to the fourth embodiment as seen from the outside, Fig. 20(b) is a perspective view of the cover as seen from the inside, Fig. 20(c) is a perspective view showing the cover with a weight attached, and Fig. 20(d) is an exploded perspective view of the cover and weight. [Figure 21] FIG. 21(a) is a bottom view of the head of the fifth embodiment, and FIG. 21(b) is an exploded perspective view of the cover and weight of the fifth embodiment. [Figure 22] FIG. 22 is a plan view of the head of the sixth embodiment. [Figure 23] FIG. 23 is a rear view of the head of the sixth embodiment. [Figure 24] Fig. 24 is a perspective view of the head of the sixth embodiment, in which one end of the cover has been released and the cover has been rotated to an open state. [Figure 25]Figures 25(a) and 25(b) are rear views of the head of the sixth embodiment. In Figures 25(a) and 25(b), one end of the cover has been released and the cover has been rotated to an open state. [Figure 26] FIG. 26 is a plan view of the head of the seventh embodiment. [Figure 27] FIG. 27(a) is a perspective view of a head of a modified example, and FIG. 27(b) is a perspective view of a head of another modified example. [Figure 28] FIG. 28(a) is a perspective view of a head of another modified example, and FIG. 28(b) is a perspective view of a head of another modified example. [Figure 29] FIG. 29(a) is a bottom view of the head of another modified example, and FIG. 29(b) is a bottom view of the head of another modified example. [Figure 30] FIG. 30 is a cross-sectional view showing an example of a fixing structure for the cover. [Figure 31] FIG. 31 is a cross-sectional view showing another example of the cover fixing structure. [Figure 32] FIG. 32 is a cross-sectional view showing another example of the cover fixing structure. [Figure 33] 33(a) and 33(b) are plan views showing other examples of the cover fixing structure. [Figure 34] FIG. 34(a) is a cross-sectional view showing a modified example of the weight and the cavity, and FIG. 34(b) is a cross-sectional view showing another modified example of the weight and the cavity. [Figure 35] FIG. 35 is a cross-sectional view showing a modified example of the weight. [Figure 36] 36(a) and 36(b) are cross-sectional views showing a structure for fixing the cover with screws. [Figure 37] FIG. 37 is a conceptual diagram for explaining the reference state of the head. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, the embodiments will be described in detail with reference to the drawings as appropriate.

[0012] In this application, a reference state, a reference vertical plane, a face-back direction, a toe-heel direction, and an up-down direction are defined. A state in which the head is placed on a horizontal plane HP with a predetermined lie angle and real loft angle is defined as the reference state. As shown in Figure 37, in this reference state, a plane VP perpendicular to the horizontal plane HP includes the center line Z of the hosel hole. The plane VP is defined as the reference vertical plane. The predetermined lie angle and real loft angle are listed in, for example, a product catalog.

[0013] In the present application, the toe-heel direction is the direction of the intersection line NL between the reference vertical plane VP and the horizontal plane HP (see FIG. 37).

[0014] In the present application, the face-back direction is a direction that is perpendicular to the toe-heel direction and parallel to the horizontal plane HP.

[0015] In the present application, the vertical direction is a direction perpendicular to the toe-heel direction and perpendicular to the face-back direction. In other words, in the present application, the vertical direction is a direction perpendicular to the horizontal plane HP.

[0016] In the present application, the face center Fc is defined. The face center Fc is determined as follows. First, an arbitrary point Pr is selected that is approximately near the center of the face surface in the up-down direction and the toe-heel direction. Next, a plane is determined that passes through this point Pr, extends along the normal to the face surface at point Pr, and is parallel to the toe-heel direction. An intersection line between this plane and the face surface is drawn, and its midpoint Px is determined. Next, a plane is determined that passes through this midpoint Px, extends along the normal to the face surface at point Px, and is parallel to the up-down direction. An intersection line between this plane and the face surface is drawn, and its midpoint Py is determined. Next, a plane is determined that passes through this midpoint Py, extends along the normal to the face surface at point Py, and is parallel to the toe-heel direction. An intersection line between this plane and the face surface is drawn, and its midpoint Px is newly determined. Next, a plane is determined that passes through this new midpoint Px, extends along the normal direction of the face surface at this point Px, and is parallel to the up-down direction. An intersection line between this plane and the face surface is drawn, and its midpoint Py is newly determined. This process is repeated to sequentially determine Px and Py. During the repetition of this process, the new position Py (last position Py) when the distance between the new midpoint Py and the immediately preceding midpoint Py first becomes 0.5 mm or less is the face center Fc.

[0017] Unless otherwise specified, in this application, "upper" means the outside of the head, and "lower" means the inside of the head.

[0018] [First embodiment] Fig. 1 is a perspective view of a golf club head 100 of a first embodiment as seen from the crown side. Fig. 2 is a bottom view of the head 100 as seen from the sole side. Fig. 3 is an exploded perspective view of the head 100. Fig. 4(a) is a cross-sectional view taken along line AA in Fig. 2.

[0019] The head 100 has a face portion 104, a crown portion 106, a sole portion 108, and a hosel portion 110. The face portion 104 has a hitting surface 104a. The hitting surface 104a is the outer surface of the face portion 104. The hitting surface 104a has a face center Fc. The crown portion 106 has a crown surface 106a. The crown surface 106a is the outer surface of the crown portion 106. The sole portion 108 has a sole surface 108a. The sole surface 108a is the outer surface of the sole portion 108. The hosel portion 110 has a hosel hole 112. The head 100 has a hollow portion S1 inside it (see FIG. 4(a)). This hollow portion S1 is surrounded by the face portion 104, the crown portion 106, and the sole portion 108. The face portion 104, the crown portion 106, and the sole portion 108 form an outer shell portion of the head 100 (head body h1).

[0020] The head 100 is a wood-type head. The type of the head 100 is not limited. For example, the head 100 may be a hybrid type, an iron type, or a putter type. The head 100 is a driver head. The club number of the head 100 is not limited.

[0021] As shown in FIG. 3, the head 100 has a head body h1, a weight w1, a cover c1, and a cover attachment member 114. In this embodiment, the cover attachment member 114 is a screw. The cover c1 has an elastic body 115. The material of the elastic body 115 can be, for example, an elastomer such as rubber. The Young's modulus of the elastic body 115 is smaller than the Young's modulus of the cover c1. The head body h1 has a face portion 104, a crown portion 106, a sole portion 108, and a hosel portion 110.

[0022] The weight w1 has a first contact portion 116 and a second contact portion 118 as contact portions. The first contact portion 116 is a first side surface (first surface). The second contact portion 118 is a second side surface (second surface). Furthermore, the weight w1 has a top surface 120 and a bottom surface 122. The top surface 120 faces the inner surface of the cover c1. The weight w1 has weight. The specific gravity of the weight w1 is preferably greater than the specific gravity of the head body h1. The specific gravity of the weight w1 is preferably greater than the specific gravity of the cover c1. The weight w1 can be made of, for example, a metal. A metal with a large specific gravity is preferred. Examples of materials for the weight w1 include iron-based alloys such as stainless steel and tungsten-containing alloys such as tungsten-nickel alloys. When the weight w1 is made of a magnetic material, the weight w1 may be made of magnetic stainless steel, for example.

[0023] The head body h1 has a cavity v1. The cavity v1 is provided in the sole portion 108. The position of the cavity v1 is not limited.

[0024] The weight w1 is housed in the cavity v1. When housed in the cavity v1, the weight w1 can move inside the cavity v1. The cavity v1 guides the movement of the weight w1. The cavity v1 is a slide groove that allows the weight w1 to slide. The weight w1 moves along the longitudinal direction of the cavity v1.

[0025] FIG. 5 is a perspective view of the head main body h1. As shown in FIGS. 4(a) and 5, the cavity v1 has a first sliding portion 130 and a second sliding portion 132 as sliding portions. The first sliding portion 130 and the second sliding portion 132 each constitute a side surface of the cavity v1. The first sliding portion 130 and the second sliding portion 132 extend along the longitudinal direction (sliding direction) of the cavity v1. The cavity v1 constitutes a groove (slide groove). The first sliding portion 130 constitutes a first side surface of the slide groove. The second sliding portion 132 constitutes a second side surface of the slide groove. The cavity v1 has a bottom surface 134. In this embodiment, the first sliding portion 130 and the second sliding portion 132 are sliding surfaces. The first sliding portion 130 abuts against the first abutment portion 116 of the weight w1. This contact is surface contact. The second sliding portion 132 is in contact with the second contact portion 118 of the weight w1. This contact is surface contact. The weight w1 moves while being guided by the first sliding portion 130 and the second sliding portion 132. During the sliding movement of the weight w1, only the first sliding portion 130 and the second sliding portion 132 are in contact with the cavity v1.

[0026] As shown in FIG. 4(a), a space SP is formed between the weight w1 and the bottom surface 134. The space SP ensures contact between the sliding portions 130, 132 and the abutting portions 116, 118. As will be described later, a first taper is formed between the sliding portions 130 and 132, and a second taper is formed between the abutting portions 116 and 118, with the second taper fitting into the first taper. Therefore, the pressing force of the cover reliably increases the contact pressure between the sliding portions 130, 132 and the abutting portions 116, 118, reliably restricting the movement of the weight w1. Furthermore, dimensional errors between the sliding portions 130, 132 and the abutting portions 116, 118 are absorbed, ensuring reliable contact between them.

[0027] 6(a) and 6(b) are perspective views showing the head 100 with the cover c1 removed. The cavity v1 extends from the toe side to the heel side. The weight w1 can move within a range from a first position to a second position. That is, the movable range of the weight w1 is from the first position to the second position. In FIG. 6(a), the weight w1 is in the first position. This first position is the heel-most position within the movable range of the weight w1. In FIG. 6(b), the weight w1 is in the second position. This second position is the toe-most position within the movable range of the weight w1. The cavity v1 extends so that the position of the weight w1 in the toe-heel direction can be changed. The weight w1 slides within the cavity v1, and would fall out of the cavity v1 if the cover c1 were not present.

[0028] The cavity v1 extends in a curved shape that is convex toward the back side of the head 100. When the weight w1 moves near the apex of this curve, the weight w1 can be positioned at the backmost position. The cavity v1 extends so that the position of the weight w1 in the face-to-back direction can be changed.

[0029] As shown in Figures 6(a) and 6(b), within the movable range, surface contact is maintained between the first sliding portion 130 of the cavity v1 and the first abutting portion 116 of the weight w1. The first sliding portion 130 and the first abutting portion 116 are curved surfaces with the same curvature. Within the movable range, surface contact is maintained between the second sliding portion 132 of the cavity v1 and the second abutting portion 118 of the weight w1. The second sliding portion 132 and the second abutting portion 118 are curved surfaces with the same curvature.

[0030] The first sliding portion 130 and the second sliding portion 132 of the cavity v1 are tapered. The distance between the first sliding portion 130 and the second sliding portion 132 narrows downward. The distance between the first sliding portion 130 and the second sliding portion 132 narrows toward the bottom surface 134 of the cavity v1. The weight w1 also has a tapered shape. The distance between the first contact portion 116 and the second contact portion 118 narrows downward. Therefore, the weight w1 is stably supported by the cavity v1, allowing for smooth sliding.

[0031] As shown in Figure 5 etc., the head main body h1 has a first cover support part 140 and a second cover support part 142. The first cover support part 140 and the second cover support part 142 each have a screw hole 144. A first end part 146 of the cover c1 is fixed to the first cover support part 140. A second end part 148 of the cover c1 is fixed to the second cover support part 142.

[0032] Fig. 7(a) is a perspective view of the cover c1 seen from its outer surface side, and Fig. 7(b) is a perspective view of the cover c1 seen from its inner surface side. The cover c1 has an outer surface 150 and an inner surface 152. The outer surface 150 forms a part of the sole surface 108a. The inner surface 152 is formed of an elastic body 115 (see Fig. 4(a)).

[0033] The cover c1 is a plate-shaped member that is bent three-dimensionally. The outer surface of the cover c1 forms a convex curved surface. The inner surface of the cover c1 forms a concave curved surface.

[0034] The cover c1 has a first hole 154 and a second hole 156. The first hole 154 and the second hole 156 are through holes. The first hole 154 is provided in a first end 146 of the cover c1. The second hole 156 is provided in a second end 148 of the cover c1. As shown in FIGS. 2 and 3 , the first end 146 is fixed to the head body h1 by a cover attachment member (screw) 114. At the first end 146, the screw 114 is inserted through the first hole 154 and screwed into the screw hole 144. The second end 148 is fixed to the head body h1 by the screw 114. At the second end 148, the screw 114 is inserted through the second hole 156 and screwed into the screw hole 144.

[0035] The cover c1 is attached to the head body h1 so as to be openable and closable. The cover c1 is closed by tightening two screws 114. In the closed state, the cover c1 covers at least a portion of the cavity v1. In this embodiment, the cover c1 in the closed state covers the entire cavity v1. The cover c1 can be opened by removing at least one of the two screws 114 from the head body h1. For example, the open state can be achieved by loosening the two screws 114, removing one screw 114 from the head body h1, and rotating the cover c1 around the other screw 114. The open state is a state in which the cover c1 does not cover the cavity v1. When only one screw 114 is removed, the cover c1 can be opened without removing it from the head body h1.

[0036] In the closed state, the cover c1 covers the cavity v1. In this embodiment, the cover c1 covers the entire cover c1. The cover c1 may also cover a portion of the cavity v1. In this embodiment, when the cover c1 is attached, the weight w1 is not visible. Note that, as described below, if the cover c1 is transparent, the weight w1 can be visible in the closed state. If the cover c1 has an elastic body 115, the cover c1 can be made transparent by forming both the main body of the cover c1 and the elastic body 115 from a transparent material.

[0037] When the cover c1 is not in the closed state, the weight w1 can move freely within the cavity v1 (see Figures 6(a) and 6(b)). When the cover c1 is in the closed state, the movement of the weight w1 within the cavity v1 is restricted. This closed state is achieved by properly tightening the screws 114. The cover c1 directly or indirectly presses the weight w1. In this embodiment, the cover c1 presses the weight w1. This pressing force causes the cover c1 to press the weight w1 while elastically deforming the elastic body 115. This pressing force causes the elastic body 115 to recess to match the shape of the weight w1 (upper surface 120), thereby locking the weight w1. This pressing force also increases the static friction force between the weight w1 and the cover c1 (elastic body 115). This pressure increases the static friction force between the weight w1 and the cavity v1 (first sliding portion 130, second sliding portion 132). The pressure from the cover c1 can effectively restrict the sliding movement of the weight w1.

[0038] The closed state in this application means a state in which the cover c1 covers at least a part of the cavity v1 and the cover c1 restricts the movement of the weight w1 by pressing force and / or engagement.

[0039] The elastic body 115 may be provided on a part other than the cover c1. In this embodiment, a part of the cover c1 is the elastic body 115. The elastic body 115 may be provided on the weight w1 side. The elastic body 115 may be provided on the upper surface 120 of the weight w1. The elastic body 115 may be provided in the cavity v1. The elastic body 115 may constitute the first sliding portion 130 and / or the second sliding portion 132.

[0040] The weight w13 shown in FIG. 3 is a second weight. The outer shape of the weight w13 is the same as that of the weight w1. The head 100 may have a replacement weight w13. The weight w13 preferably has a different weight than the weight w1. In this case, the center of gravity of the head can be changed by replacing the weight. Both the first weight w1 and the second weight w13 can be placed in the cavity v1. By placing multiple weights in the cavity v1, the moment of inertia of the head can be increased. From the viewpoint of versatility in adjusting the center of gravity of the head, the number of weights can be two or more, three or more, or even four or more. From the viewpoint of the number of parts, the number of weights can be ten or less, further eight or less, or even six or less.

[0041] [Modification (another form of contact between the weight and the cover)] The weight does not have to have a surface along the cavity, and the weight does not have to be in surface contact with the cavity.

[0042] FIG. 8 shows a weight w10 according to a modified example. The cross-sectional shape of this weight w10 is triangular. The weight w10 has a first abutment portion 160 and a second abutment portion 162. The first abutment portion 160 is a side that forms a (first) corner of the weight w10. The first abutment portion 160 is located at one point. The first abutment portion 160 abuts against the first sliding portion 130 of the cavity v1. This abutment is line contact or point contact. The two second abutment portions 162 are sides that form the second and third corners of the weight w10. These second abutment portions 162 abut against the second sliding portion 132 of the cavity v1. This abutment is line contact or point contact. Due to the abutment at three points, the posture of the weight w10 is stable during sliding. The weight w10 can slide stably without rattle during sliding. The weight w10 does not require surface contact with the cavity v1, allowing for a high degree of freedom in shape. High dimensional accuracy is not required for this weight w10. High dimensional accuracy is also not required for the first sliding portion 130 and the second sliding portion 132.

[0043] FIG. 9 shows a weight w11 according to another modification. This weight w11 has three protrusions. The first protrusion is a first contact portion 164. The second and third protrusions are second contact portions 166. The first contact portion 164 contacts the first sliding portion 130 of the cavity v1. This contact is either line contact or point contact. The two second contact portions 166 contact the second sliding portion 132 of the cavity v1. This contact is either line contact or point contact. Due to the contact at three points, the posture of the weight w11 is stable during sliding. The weight w11 can slide stably without rattle during sliding. The weight w11 does not require surface contact with the cavity v1, allowing for a high degree of freedom in shape. High dimensional accuracy is not required for this weight w11. The first sliding portion 130 and the second sliding portion 132 also do not require high dimensional accuracy.

[0044] 10 shows a cavity v10 according to a modified example. The cavity v10 has a first extension portion 170 and a second extension portion 172. The first extension portion 170 and the second extension portion 172 each form a side surface of the cavity v10. The first extension portion 170 and the second extension portion 172 extend along the longitudinal direction (sliding direction) of the cavity v10. The cavity v10 forms a groove, with the first extension portion 170 forming a first side surface of the groove and the second extension portion 172 forming a second side surface of the groove.

[0045] The first extension portion 170 has a plurality of protrusions 174. The plurality of protrusions 174 are distributed at different positions in the longitudinal direction of the cavity v10. These protrusions 174 constitute a first sliding portion. The second extension portion 172 has a plurality of protrusions 176. The plurality of protrusions 176 are distributed at different positions in the longitudinal direction of the cavity v10. These protrusions 176 constitute a second sliding portion.

[0046] During sliding, weight w1 abuts against three protrusions selected from protrusions 174 and protrusions 176. These three protrusions include at least one protrusion 174 and at least one protrusion 176. Throughout the entire movable range of weight w1, contact with the three protrusions is maintained regardless of the position of weight w1. Protrusions 174 and 176 are arranged so that contact with the three protrusions is maintained regardless of the position of weight w1. As weight w1 moves, the protrusions that abut weight w1 are switched. The contact between weight w1 and protrusions 174 and 176 can be line contact or point contact.

[0047] The contact at three points stabilizes the posture of the weight w1 while it slides. The weight w1 can slide stably without rattle. The cavity v10, which does not require surface contact with the weight w1, has a high degree of freedom in shape. High dimensional accuracy is not required for this cavity v10. High dimensional accuracy is also not required for the first sliding portion 174 and the second sliding portion 176.

[0048] In this way, surface contact between the weight and the cavity is not necessarily required. This reduces the dimensional accuracy required for the cavity and the weight. In the case of surface contact, smooth sliding can be achieved due to reduced contact pressure.

[0049] Fig. 11(a) is a perspective view of a modified cover c10 as seen from the outside. Fig. 11(b) is a perspective view of the cover c10 as seen from the inside. Fig. 11(c) is a perspective view of a weight w12 used with this cover c10. Fig. 11(d) is a perspective view showing the engagement between the cover c10 and the weight w12. Fig. 11(e) is a cross-sectional view of the head along the longitudinal direction of the cover c10. Note that screw holes provided at both ends of the cover c10 are not shown.

[0050] The cover c10 has an inner surface 178 and an outer surface 179. The inner surface 178 of the cover c10 has multiple recesses 180. The recesses 180 are concavely curved. The multiple recesses 180 are arranged at different positions in the longitudinal direction of the cover c10. The multiple recesses 180 are adjacent to each other and lined up at different positions in the longitudinal direction of the cover c10. The multiple recesses 180 are an example of a concave-convex engagement portion 182 provided on the inner surface of the cover c10. The concave-convex engagement portion 182 may be multiple protrusions. The multiple recesses 180 and the concave-convex engagement portion 182 are an example of a cover engagement shape that engages with the weight w12 at each of multiple positions during the sliding movement of the weight w12. The cover engagement shape may be at least one recess or protrusion.

[0051] The weight w12 has a protrusion 184. The upper surface of the weight w12 forms the protrusion 184. The protrusion 184 is an example of a weight engagement shape that engages with the cover engagement shape when the cover c10 is in the closed state. The weight engagement shape 184 may be a recess.

[0052] The shape of the convex portion 184 corresponds to the shape of the concave portion 180. The convex portion 184 engages with the concave portion 180. At different positions in the longitudinal direction of the cover c10, the concave-convex engagement portion 182 engages with the weight engagement shape 184. This engagement enhances the effect of the cover c10 in restricting the movement of the weight w12.

[0053] The upper surface of the weight w12 forms a convex portion 184. The upper surface 184 of the weight w12 is a curved surface that convex upward. The lower surface 186 of the weight w12 is a curved surface that convex upward. The radius of curvature of the upper surface 184 is smaller than the radius of curvature of the lower surface 186. By making the radius of curvature of the upper surface 184 smaller, the engagement effect with the recess 180 is improved.

[0054] [Second embodiment] Fig. 12 is a bottom view of the golf club head 200 of the second embodiment as seen from the sole side, and Fig. 13 is an exploded perspective view of the head 200.

[0055] The head 200 has a face portion 204, a crown portion 206, a sole portion 208, and a hosel portion 210. The face portion 204 has a hitting surface 204a. The hitting surface 204a is the outer surface of the face portion 204. The hitting surface 204a has a face center Fc. The crown portion 206 has a crown surface 206a. The crown surface 206a is the outer surface of the crown portion 206. The sole portion 208 has a sole surface 208a. The sole surface 208a is the outer surface of the sole portion 208. The hosel portion 210 has a hosel hole 212. The head 200 has a hollow portion therein.

[0056] 13, the head 200 has a head body h2, a weight w2, a cover c2, and a screw 214 (see FIG. 12) serving as a cover attachment member. The head body h2 has a face portion 204, a crown portion 206, a sole portion 208, and a hosel portion 210. The head body h2 is the same as the head body h1 described above.

[0057] The weight w2 has a first contact portion 216 and a second contact portion 218. The first contact portion 216 is a first side surface (first surface). The second contact portion 218 is a second side surface (second surface). Furthermore, the weight w2 has a top surface 220 and a bottom surface 222. The top surface 220 faces the inner surface 252 of the cover c2. The weight w2 has weight. The specific gravity of the weight w2 is preferably greater than the specific gravity of the head body h2. The specific gravity of the weight w2 is preferably greater than the specific gravity of the cover c2. The weight w2 may be made of, for example, a metal. A metal with a large specific gravity is preferred. Examples of materials for the weight w2 include iron-based alloys of stainless steel and tungsten-containing alloys such as tungsten-nickel alloys.

[0058] The head body h2 has a cavity v2. The cavity v2 is provided in the sole portion 208. The position of the cavity v2 is not limited.

[0059] 13, the cavity v2 has a first sliding portion 230 and a second sliding portion 232. The first sliding portion 230 and the second sliding portion 232 each constitute a side surface of the cavity v2. The first sliding portion 230 and the second sliding portion 232 extend along the longitudinal direction (sliding direction) of the cavity v2. The cavity v2 constitutes a groove, with the first sliding portion 230 constituting a first side surface of this groove and the second sliding portion 232 constituting a second side surface of this groove.

[0060] The weight w2, excluding the weight engagement portion 270, is housed in the cavity v2. When housed in the cavity v2, the weight w2 can move within the cavity v2. The cavity v2 guides the movement of the weight w2. The cavity v2 is a slide groove that allows the weight w2 to slide. The weight w2 moves along the longitudinal direction of the cavity v2.

[0061] Fig. 14(a) is a perspective view of the cover c2 seen from its outer surface, Fig. 14(b) is a perspective view of the cover c2 seen from its inner surface, Fig. 14(c) is a perspective view of the weight w2, Fig. 14(d) is an exploded perspective view of the weight w2, and Fig. 14(e) is a perspective view showing the assembled state of the cover c2 and the weight w2.

[0062] The cover c2 has an outer surface 250 and an inner surface 252. The outer surface 250 forms a part of the sole surface 208a. The inner surface 252 abuts against the weight w2. The cover c2 directly presses against the weight w2.

[0063] The cover c2 has a first hole 254 and a second hole 256. The first hole 254 and the second hole 256 are through holes. The first hole 254 is provided at a first end 246 of the cover c2. The second hole 256 is provided at a second end 248 of the cover c2. The first end 246 is fixed to the head body h2 by a screw 214. The second end 248 is fixed to the head body h2 by a screw 214. The cover c2 has an intermediate portion 247 located between the first end 246 and the second end 248. The width of the intermediate portion 247 is narrower than the width of the first end 246. The width of the intermediate portion 247 is narrower than the width of the second end 248.

[0064] The cover c2 has a first edge 258 and a second edge 260. The first edge 258 and the second edge 260 are provided in the middle portion 247. The first edge 258 and the second edge 260 are edges on both sides of the cover c2. The first edge 258 and the second edge 260 define the contour shape of the cover c2. The first edge 258 and the second edge 260 extend along the sliding path of the weight w2.

[0065] The cover c2 in the closed state covers the cavity v2. In this embodiment, the cover c2 covers a portion of the cavity v2. As shown in FIG. 12, a gap GP is formed between the opening edge of the cavity v2 and the cover c2. The gap GP is formed on both sides of the cover member c2 (middle portion 247) along the extension direction of the cover member c2. These gaps GP allow the presence of the weight engagement portion 270 (vertical wall portion 272a and vertical wall portion 274a), which will be described later.

[0066] These gaps GP may be filled with gap closure members 262. In FIG. 12, the gap closure members 262 are indicated by cross-hatching. The gap closure members 262 may be provided in the cavity v2. The gap closure members 262 may also be provided in the cover c2. The gap closure members 262 do not hinder the movement of the weight engagement portions 270. The gap closure members 262 are easily deformed by the weight engagement portions 270. Examples of the material for the gap closure members 262 include foamed plastic. Examples of this foamed plastic include polyurethane foam and EVA foam. EVA stands for ethylene vinyl acetate copolymer.

[0067] As shown in FIG. 14(d), the weight w2 has a weight engagement portion 270. The weight engagement portion 270 protrudes from the main body of the weight w2 (the upper surface 220 of the weight w2) toward the cover c2. The weight engagement portion 270 has a first engagement portion 272 and a second engagement portion 274. The first engagement portion 272 has a vertical wall portion 272a extending upward and a horizontal wall portion 272b extending from the upper end of the vertical wall portion 272a toward the second engagement portion 274. The second engagement portion 274 has a vertical wall portion 274a extending upward and a horizontal wall portion 274b extending from the upper end of the vertical wall portion 274a toward the second engagement portion 272.

[0068] When the weight w2 is attached to the cover c2, the cover c2 (middle portion 247) is sandwiched between the first engagement portion 272 and the second engagement portion 274. The cover c2 (middle portion 247) is sandwiched horizontally between the vertical wall portion 272a and the vertical wall portion 274a. The cover c2 (middle portion 247) is also sandwiched vertically between the horizontal wall portion 272b and the main body (upper surface 220) of the weight w2. It is sandwiched vertically between the horizontal wall portion 274b and the main body (upper surface 220) of the weight w2.

[0069] The weight engagement portion 270 engages with the cover c2. The weight engagement portion 270 has a first engagement portion 272 and a second engagement portion 274. The first engagement portion 272 engages with the first edge 258 of the cover c2. The second engagement portion 274 engages with the second edge 260 of the cover c2. The first edge 258 and the second edge 260 are cover engagement portions.

[0070] The weight w2 has a portion located outside the cover c2. The lateral wall portion 272b and the lateral wall portion 274b are portions located outside the cover c2 (see FIG. 12). The lateral wall portion 272b and the lateral wall portion 274b are located above (outside of) the outer surface 250 of the cover member c2.

[0071] The weight w2 has a portion that is visible from the outside. The weight engagement portion 270 (the side wall portion 272b and the side wall portion 274b) is the portion that is visible from the outside (see FIG. 12). The weight w2 has a portion that is exposed to the outside. The weight engagement portion 270 (the side wall portion 272b and the side wall portion 274b) is the portion that is exposed to the outside.

[0072] In this embodiment, the first sliding portion 230 and the second sliding portion 232 are sliding surfaces. The first sliding portion 230 abuts against the first abutment portion 216 of the weight w2. The second sliding portion 232 abuts against the second abutment portion 218 of the weight w2. The sliding movement of the weight w2 is guided by the cavity v2 (the first sliding portion 230 and the second sliding portion 232). A sliding mechanism (first sliding mechanism) is configured between the cavity v2 and the weight w2. There is no restricting mechanism between the cavity v2 and the weight w2 that restricts the sliding movement of the weight w2.

[0073] The engagement between the cover member c2 and the weight w2 can also serve as a slide mechanism (second slide mechanism). From the viewpoint of not interfering with the movement of the first slide mechanism, it is preferable that there is play between the weight engagement portion 270 and the cover c2 (intermediate portion 247).

[0074] As shown in FIG. 14(d), the weight w2 is composed of three members. The weight w2 has a divided structure. The weight w2 has a first divided body 280 and a second divided body 282. The weight w2 also has a connecting member 284. The connecting member 284 is a screw. The first divided body 280 and the second divided body 282 are connected by the connecting member 284. The weight w2 is attached to the cover c2 by connecting the first divided body 280 and the second divided body 282 while sandwiching the cover c2 (middle portion 247).

[0075] The weight w2 is attached to the cover c2 and does not separate from the cover c2. The weight w2 does not fall off on its own. As long as the cover c2 is attached to the head body h2, the weight w2 does not fall off. The head 200 prevents the weight w2 from falling off.

[0076] When the cover c2 is in the closed state, the movement of the weight w2 within the cavity v2 is restricted. This closed state is achieved by properly tightening the screw 214. The cover c2 presses the weight w2 directly or indirectly. In this embodiment, the cover c2 directly presses the weight w2. This pressure increases the static friction force between the weight w2 and the part that abuts it. The pressure by the cover c2 effectively restricts the sliding movement of the weight w2. The closed state can be released by loosening the screw 214. When the closed state is released, the weight w2 can slide. The weight w2 can be moved without removing the cover c2 from the head body h2.

[0077] [Third embodiment] 15 is a bottom view of a golf club head 300 according to a third embodiment as viewed from the sole side, and FIG.

[0078] The head 300 has a face portion 304, a crown portion 306, a sole portion 308, and a hosel portion 310. The face portion 304 has a hitting surface 304a. The hitting surface 304a is the outer surface of the face portion 304. The hitting surface 304a has a face center Fc. The crown portion 306 has a crown surface 306a. The crown surface 306a is the outer surface of the crown portion 306. The sole portion 308 has a sole surface 308a. The sole surface 308a is the outer surface of the sole portion 308. The hosel portion 310 has a hosel hole 312. The head 300 has a hollow portion therein.

[0079] 16, the head 300 has a head body h3, a weight w3, a cover c3, and a screw 314 as a cover attachment member. The head body h3 has a face portion 304, a crown portion 306, a sole portion 308, and a hosel portion 310. The head body h3 is the same as the head body h1 described above.

[0080] The weight w3 has a first contact portion 316 and a second contact portion 318. The first contact portion 316 is a first side surface (first face). The second contact portion 318 is a second side surface (second face). Furthermore, the weight w3 has a top surface 320 and a bottom surface 322.

[0081] The head body h3 has a cavity v3. The cavity v3 is provided in the sole portion 308. The position of the cavity v3 is not limited.

[0082] 16, the cavity v3 has a first sliding portion 330 and a second sliding portion 332. The first sliding portion 330 and the second sliding portion 332 each constitute a side surface of the cavity v3. The first sliding portion 330 and the second sliding portion 332 extend along the longitudinal direction (sliding direction) of the cavity v3. The cavity v3 constitutes a groove, with the first sliding portion 330 constituting a first side surface of the groove and the second sliding portion 332 constituting a second side surface of the groove.

[0083] The lower part of the weight w3 is housed in the cavity v3. When housed in the cavity v3, the weight w3 can move inside the cavity v3. The cavity v3 guides the movement of the weight w3. The weight w3 can slide in the cavity v3. The cavity v3 is a slide groove that allows the weight w3 to slide. The weight w3 moves along the longitudinal direction of the cavity v3.

[0084] Fig. 17(a) is a perspective view of the cover c3 seen from its outer surface, Fig. 17(b) is a perspective view of the cover c3 seen from its inner surface, Fig. 17(c) is a perspective view of the weight w3, Fig. 17(d) is an exploded perspective view of the weight w3, and Fig. 17(e) is a perspective view showing the assembled state of the cover c3 and the weight w3.

[0085] The cover c3 has an outer surface 350 and an inner surface 352. The outer surface 350 forms a part of the sole surface 308a. The inner surface 352 abuts against the weight w3. The cover c3 directly presses against the weight w3.

[0086] The cover c3 has a first hole 354 and a second hole 356. The first hole 354 and the second hole 356 are through holes. The first hole 354 is provided at a first end 346 of the cover c3. The second hole 356 is provided at a second end 348 of the cover c3. The first end 346 is fixed to the head body h3 with a screw 314. The second end 348 is fixed to the head body h3 with a screw 314. The cover c3 has an intermediate portion 347 located between the first end 346 and the second end 348. The width of the intermediate portion 347 is the same as the widths of the first end 346 and the second end 348.

[0087] The cover c3 has a cover engagement portion 358. The cover engagement portion 358 is provided on the inner surface 352. The cover engagement portion 358 protrudes from the inner surface 352. The cover engagement portion 358 is provided on the intermediate portion 347. The cover engagement portion 358 extends along the cover c3. The cover engagement portion 358 forms a protrusion that engages with the weight w3 at any position during sliding movement. The cover engagement portion 358 extends along the sliding path of the weight w3. The cover engagement portion 358 has a T-shaped cross section.

[0088] The cover c3 in the closed state covers the cavity v3. In this embodiment, the cover c3 covers the entire cavity v3.

[0089] As shown in FIG. 17(d), the weight w3 has a weight engagement portion 370. The weight engagement portion 370 is formed on the upper surface of the weight w3 (the surface on the cover c3 side). The weight engagement portion 370 has a cross-sectional shape corresponding to the cover engagement portion 358. The weight engagement portion 370 has a T-shaped (inverted T-shaped) cross-sectional shape. The cross-sectional shape of the weight engagement portion 370 is not limited to a T-shape. For example, the cross-sectional shape of the weight engagement portion 370 may be an L-shape (inverted L-shape).

[0090] The weight engagement portion 370 engages with the cover c3. The weight engagement portion 370 engages with the cover engagement portion 358 of the cover c3. The weight engagement portion 370 is a slide groove. The cover engagement portion 358 is a slide rail.

[0091] The weight w3 is hidden by the cover c3. The weight w3 is not visible from the outside. The weight w3 does not have any exposed portion.

[0092] In this embodiment, the first sliding portion 330 and the second sliding portion 332 are sliding surfaces. The first sliding portion 330 abuts against the first abutment portion 316 of the weight w3. The second sliding portion 332 abuts against the second abutment portion 318 of the weight w3. The sliding movement of the weight w3 is guided by the cavity v3 (the first sliding portion 330 and the second sliding portion 332). A sliding mechanism is configured between the cavity v3 and the weight w3. There is no restriction mechanism between the cavity v3 and the weight w3 that restricts the sliding movement of the weight w3.

[0093] As shown in Figure 17(d), the weight w3 is composed of three members. The weight w3 has a divided structure. The weight w3 has a first divided body 380 and a second divided body 382. The weight w3 also has a connecting member 384. The connecting member 384 is a screw. The first divided body 380 and the second divided body 382 are connected by the connecting member 384. The weight w3 is attached to the cover c3 by connecting the first divided body 380 and the second divided body 382 while sandwiching the cover engaging portion 358.

[0094] The weight w3 is attached to the cover c3 and will not separate from the cover c3. The weight w3 will not fall off on its own. As long as the cover c3 is attached to the head body h3, the weight w3 will not fall off. The head 300 prevents the weight w3 from falling off.

[0095] When the cover c3 is in the closed state, the cover c3 presses against the cavity v3. This pressing force restricts the movement of the weight w3 within the cavity v3. This closed state is achieved by properly tightening the screw 314. The cover c3 directly presses against the weight w3. This pressing force increases the static friction between the weight w3 and the part that abuts it. The pressure from the cover c3 effectively restricts the sliding movement of the weight w3. Loosening the screw 314 releases the closed state. When the cover c3 is in the open state, the weight w3 can slide.

[0096] [Fourth embodiment] 18 is a bottom view of the golf club head 400 of the fourth embodiment as seen from the sole side, and FIG.

[0097] The head 400 has a face portion 404, a crown portion 406, a sole portion 408, and a hosel portion 410. The face portion 404 has a hitting surface 404a. The hitting surface 404a is the outer surface of the face portion 404. The hitting surface 404a has a face center Fc. The crown portion 406 has a crown surface 406a. The crown surface 406a is the outer surface of the crown portion 406. The sole portion 408 has a sole surface 408a. The sole surface 408a is the outer surface of the sole portion 408. The hosel portion 410 has a hosel hole 412. The head 400 has a hollow portion therein.

[0098] 19, the head 400 has a head body h4, a weight w4, a cover c4, and a screw 414 as a cover attachment member. The head body h4 has a face portion 404, a crown portion 406, a sole portion 408, and a hosel portion 410. The head body h4 is the same as the head body h1 described above.

[0099] The weight w4 has a first contact portion 416 and a second contact portion 418. The first contact portion 416 is a first side surface (first face). The second contact portion 418 is a second side surface (second face). Furthermore, the weight w4 has a top surface 420 and a bottom surface 422.

[0100] The head body h4 has a cavity v4. The cavity v4 is provided in the sole portion 408. The position of the cavity v4 is not limited.

[0101] 19, the cavity v4 has a first sliding portion 430 and a second sliding portion 432. The first sliding portion 430 and the second sliding portion 432 each constitute a side surface of the cavity v4. The first sliding portion 430 and the second sliding portion 432 extend along the longitudinal direction (sliding direction) of the cavity v4. The cavity v4 constitutes a groove, with the first sliding portion 430 constituting a first side surface of this groove and the second sliding portion 432 constituting a second side surface of this groove.

[0102] The body 480 of the weight w4 is housed in the cavity v4. When housed in the cavity v4, the weight w4 can move inside the cavity v4. The cavity v4 guides the movement of the weight w4. The weight w4 can slide in the cavity v4. The cavity v4 is a slide groove that allows the weight w4 to slide. The weight w4 moves along the longitudinal direction of the cavity v4.

[0103] Fig. 20(a) is a perspective view of the cover c4 seen from its outer surface side, Fig. 20(b) is a perspective view of the cover c4 seen from its inner surface side, Fig. 20(c) is a perspective view showing the assembled state of the cover c4 and the weight w4, Fig. 20(d) is an exploded perspective view showing the structure in which the weight w4 is attached to the cover c4.

[0104] The cover c4 has an outer surface 450 and an inner surface 452. The outer surface 450 forms a part of the sole surface 408a. The inner surface 452 abuts against the weight w4. The cover c4 directly presses against the weight w4.

[0105] The cover c4 has a first hole 454 and a second hole 456. The first hole 454 and the second hole 456 are through holes. However, as shown in FIG. 20(a), the second hole 456 is split into two. The first hole 454 is provided at a first end 446 of the cover c4. The second hole 456 is provided at a second end 448 of the cover c4. The first end 446 is fixed to the head body h4 with a screw 414. The second end 448 is fixed to the head body h4 with a screw 414. The cover c4 has an intermediate portion 447 located between the first end 446 and the second end 448. The width of the intermediate portion 447 is the same as the widths of the first end 446 and the second end 448. The thickness of the intermediate portion 447 is smaller than the thicknesses of the first end 446 and the second end 448.

[0106] The cover c4 has a cover engagement portion 458. The cover engagement portion 458 is a slit. The cover engagement portion 458 penetrates the cover c4 in the thickness direction. The cover engagement portion 458 is provided over the entire length of the cover c4 except for the first end 446. The cover engagement portion 458 is formed along the longitudinal direction of the cover c4. The cover engagement portion 458 extends along the sliding track of the weight w4. The cover engagement portion 458 divides the middle portion 447 into two parts. The cover engagement portion 458 divides the second end 448 into two parts. The cover engagement portion 458 is open at the second end 448. As shown in FIG. 20(b), a closing member 449 may be provided to close the open end 448. The screw 414 is also a closing member that closes the open end 448. The closing member prevents the weight w4 from falling off the cover c4. The cover engagement portion 458 does not necessarily have to have the second end portion 448 divided into two. If the weight w4 is divided into two members as in this embodiment, the weight w4 can be attached to the cover engagement portion 458 at the intermediate portion 447 (see FIG. 20(d)). Therefore, the end portion of the cover engagement portion 458 does not need to be open.

[0107] The cover c4 attached in the closed state covers the cavity v4. In this embodiment, the cover c4 does not cover the entire cavity v4. The cover c4 covers only a portion of the cavity v4. The cover engagement portion 458 forms the portion of the cavity v4 that the cover c4 does not cover.

[0108] As shown in Figures 18, 20(c), and 20(d), the weight w4 has a weight engagement portion 470. The weight engagement portion 470 is a screw. The weight engagement portion 470 is fixed to a main body 480 of the weight w4. The weight engagement portion 470 is screwed into the main body 480 of the weight w4.

[0109] The weight engagement portion 470 has an insertion portion 472 that is inserted into the cover engagement portion 458, and an exposed portion 474 that is exposed to the outside of this cover c4. The insertion portion 472 is the shank of the screw. The insertion portion 472 has a male thread portion. The exposed portion 474 is the head of the screw. The exposed portion 474 has a dimension that prevents it from passing through the cover engagement portion 458.

[0110] The weight engagement portion 470 engages with the cover c4. The weight engagement portion 470 engages with the cover engagement portion 458 of the cover c4. The weight engagement portion 470 is a slide protrusion. The cover engagement portion 458 is a slide groove.

[0111] 18, the exposed portion 474 of the weight w4 is not hidden by the cover c4 and is visible from the outside.

[0112] In this embodiment, the first sliding portion 430 and the second sliding portion 432 are sliding surfaces. The first sliding portion 430 abuts against the first abutment portion 416 of the weight w4. The second sliding portion 432 abuts against the second abutment portion 418 of the weight w4. The sliding movement of the weight w4 is guided by the cavity v4 (the first sliding portion 430 and the second sliding portion 432). A sliding mechanism is configured between the cavity v4 and the weight w4. There is no restriction mechanism between the cavity v4 and the weight w4 that restricts the sliding movement of the weight w4.

[0113] As clearly shown in FIG. 20(d), the weight w4 is composed of two members. The weight w4 is composed of a member 478 that constitutes the weight engagement portion 470 and a weight main body 480. The member 478 is a screw. The weight w4 is formed by threading the screw 478 into the weight main body 480. The weight w4 can be attached to the cover c4 by inserting the insertion portion 472 (shaft portion) into the cover engagement portion 458 and attaching the weight engagement portion 470 to the weight main body 480 (see FIG. 20(d)). In addition, because the cover engagement portion 458 is open on the second end 448 side (see FIG. 20(a)), the weight w4 can also be attached to the cover c4 with the weight engagement portion 470 connected to the weight main body 480. That is, the weight w4 can be attached to and detached from the cover c4 without disassembling the weight w4.

[0114] The weight w4 is attached to the cover c4. The weight w4 will not separate from the cover c4 unless the end of the cover engagement portion 458 is released. As long as the second end 448 is attached to the head body h4, the end of the cover engagement portion 458 will not be released, and the weight w4 will not fall off the cover c4.

[0115] When the cover c4 is closed, the movement of the weight w4 within the cavity v4 is restricted. This closed state is achieved by properly tightening the screw 414. The cover c4 directly presses the weight w4. This pressure increases the static friction between the weight w4 and the part it abuts. The pressure from the cover c4 effectively restricts the sliding movement of the weight w4. The closed state can be released by loosening the screw 414. When the closed state is released, the weight w4 can slide. The weight w4 can be moved without removing the cover c4 from the head body h4.

[0116] [Fifth embodiment] Fig. 21(a) is a bottom view of a golf club head 500 according to a fifth embodiment as viewed from the sole side, and Fig. 21(b) is an exploded perspective view showing a weight w5 and a cover c5 of the head 500.

[0117] The head 500 has a face portion and a crown portion (not shown), a sole portion 508, and a hosel portion 510. The sole portion 508 has a sole surface 508a. The sole surface 508a is the outer surface of the sole portion 508. The head 500 has a head body h5, a weight w5, a cover c5, and a screw 514 as a cover attachment member. The head body h5 is the same as the head body h1 described above.

[0118] 21(b), the weight w5 has a first portion w51 and a second portion w52. The weight w5 further has a connecting portion 524 connecting the first portion w51 and the second portion w52.

[0119] The outer shape of the first portion w51 is the same as the outer shape of the second portion w52. The first portion w51 has a first abutment portion 516 and a second abutment portion 518. The second portion w52 also has a first abutment portion 516 and a second abutment portion 518.

[0120] The weight w5 can be used upside down. The first portion w51 of the weight w5 can be housed in the cavity v5 with the second portion w52 exposed to the outside, or the second portion w52 can be housed in the cavity v5 with the first portion w51 exposed to the outside.

[0121] The head body h5 has a cavity v5. The cavity v5 is provided in the sole portion 508. The position of the cavity v5 is not limited.

[0122] Although not shown, the cavity v5 has a first sliding portion and a second sliding portion. The first sliding portion and the second sliding portion each constitute a side surface of the cavity v5. The first sliding portion and the second sliding portion extend along the longitudinal direction (sliding direction) of the cavity v5. The cavity v5 constitutes a groove, with the first sliding portion constituting a first side surface of the groove and the second sliding portion constituting a second side surface of the groove.

[0123] The first portion w51 or the second portion w52 is housed in the cavity v5. When housed in the cavity v5, the weight w5 can move inside the cavity v5. The cavity v5 guides the movement of the weight w5. The weight w5 can slide in the cavity v5. The cavity v5 is a slide groove that allows the weight w5 to slide. The weight w5 moves along the longitudinal direction of the cavity v5.

[0124] As shown in Figure 21(b), the cover c5 has an outer surface 550 and an inner surface 552. The outer surface 550 forms a part of the sole surface 508a. The inner surface 552 abuts against the weight w5 (the first portion w51 or the second portion w52). The cover c5 directly presses against the weight w5.

[0125] The cover c5 has a first hole 554 and a second hole 556. The first hole 554 and the second hole 556 are through holes. However, the second hole 556 is split into two. The first hole 554 is provided at a first end 546 of the cover c5. The second hole 556 is provided at a second end 548 of the cover c5. The first end 546 is fixed to the head body h5 with a screw 514. The second end 548 is fixed to the head body h5 with a screw 514. The cover c5 has an intermediate portion 547 located between the first end 546 and the second end 548. The width of the intermediate portion 547 is the same as the widths of the first end 546 and the second end 548. The thickness of the intermediate portion 547 is smaller than the thicknesses of the first end 546 and the second end 548.

[0126] The cover c5 has a cover engagement portion 558. The cover engagement portion 558 is a slit. The cover engagement portion 558 penetrates the cover c5 in the thickness direction. The cover engagement portion 558 is provided over the entire length of the cover c5 excluding the first end portion 546. The cover engagement portion 558 is formed along the longitudinal direction of the cover c5. The cover engagement portion 558 extends along the slide path of the weight w5. The cover engagement portion 558 divides the intermediate portion 547 into two. The cover engagement portion 558 divides the second end portion 548 into two. The cover engagement portion 558 is open at the second end portion 548. Note that the cover engagement portion 558 does not necessarily divide the second end portion 548 into two. In this embodiment, the weight w5 can be attached to the cover engagement portion 558 at the intermediate portion 547 (see FIG. 21(b)). Therefore, the end of the cover engagement portion 558 does not need to be open.

[0127] In the closed state, the cover c5 covers the cavity v5. In this embodiment, the cover c5 does not cover the entire cavity v5. The cover c5 covers only a portion of the cavity v5. The cover engagement portion 558 forms the portion of the cavity v5 that the cover c5 does not cover.

[0128] As shown in FIG. 21(b), the weight w5 has a weight engagement portion 570. The weight engagement portion 570 is a connecting portion 524. The weight engagement portion 570 extends between the first portion w51 and the second portion w52. A first end of the connecting portion 524 is fixed to the first portion w51. A second end of the connecting portion 524 is fixed to the second portion w52. The connecting portion 524 forms a constricted portion in the weight w5. In this manner, a constricted portion may be provided in at least one location on the weight w5. This constricted portion is inserted into the cover engagement portion 558 (slit). The weight w5 has a shape that is symmetrical up and down across the constricted portion.

[0129] The weight engagement portion 570 has an insertion portion 572 that is inserted into the cover engagement portion 558, and an exposed portion 574 that is exposed to the outside of this cover c5. The insertion portion 572 is the connecting portion 524. When the first portion w51 is housed in the cavity v5, the exposed portion 574 is the second portion w52. When the second portion w52 is housed in the cavity v5, the exposed portion 574 is the first portion w51. The exposed portion 574 (the first portion w51 or the second portion w52) has a dimension that prevents it from passing through the cover engagement portion 558. The exposed portion 574 slides on the cover c5.

[0130] The weight engagement portion 570 engages with the cover c5. The weight engagement portion 570 engages with the cover engagement portion 558 of the cover c5. The weight engagement portion 570 is a slide protrusion. The cover engagement portion 558 is a slide groove.

[0131] 21(a), the exposed portion 574 of the weight w5 is not hidden by the cover c5 and is visible from the outside.

[0132] In this embodiment, the first sliding portion and the second sliding portion of the cavity v5 are sliding surfaces. When the first portion w51 is housed in the cavity v5, the first sliding portion abuts against the first abutment portion 516 of the first portion w51, and the second sliding portion abuts against the second abutment portion 518 of the first portion w51. When the second portion w52 is housed in the cavity v5, the first sliding portion abuts against the first abutment portion 516 of the second portion w52, and the second sliding portion abuts against the second abutment portion 518 of the second portion w52. The sliding movement of the weight w5 (first portion w51, second portion w52) is guided by the cavity v5 (first sliding portion and second sliding portion). A sliding mechanism is configured between the first portion w51 or the second portion w52 and the cavity v5. There is no restriction mechanism between the cavity v5 and the weight w5 that restricts the sliding movement of the weight w5.

[0133] The weight w5 is composed of three members. The weight w5 has a divided structure. The weight w5 can be attached to the cover c5 by inserting the connecting portion 524 into the cover engaging portion 558 and connecting the first portion w51 and the second portion w52 (see FIG. 21(b)). In addition, because the cover engaging portion 558 is open on the second end 548 side, the weight w5 can also be attached to the cover c5 with the first portion w51 and the second portion w52 connected together.

[0134] The weight w5 is attached to the cover c5. The weight w5 will not separate from the cover c5 unless the end of the cover engagement portion 558 is released. As long as the second end 548 is attached to the head body h5, the end of the cover engagement portion 558 will not be released, and the weight w5 will not fall off the cover c5.

[0135] When the cover c5 is attached in the closed state, the movement of the weight w5 within the cavity v5 is restricted. This closed state is achieved by properly tightening the screw 514. The cover c5 directly presses the weight w5 (the first portion w51 or the second portion w52). This pressure increases the static friction between the weight w5 and the portion that abuts it. The pressure from the cover c5 effectively restricts the sliding movement of the weight w5. The closed state can be released by loosening the screw 514. When the closed state is released, the weight w5 can slide. The weight w5 can be moved without removing the cover c5 from the head body h5.

[0136] [Sixth embodiment] FIG. 22 is a plan view of a golf club head 600 of a sixth embodiment as seen from the crown side. FIG. 23 is a rear view of the head 600 as seen from the back side. FIG. 24 is a perspective view of the head 600. FIGS. 25(a) and 25(b) are rear views of the head 600. In FIGS. 24, 25(a), and 25(b), the cover c6 is rotated about one end thereof and removed from the cavity v6. In FIGS. 24, 25(a), and 25(b), the cover c6 is in an open state.

[0137] The head 600 has a face portion 604, a crown portion 606, a sole portion 608, and a hosel portion 610. The face portion 604 has a hitting surface 604a. The hitting surface 604a is the outer surface of the face portion 604. The hitting surface 604a has a face center Fc. The crown portion 606 has a crown surface 606a. The crown surface 606a is the outer surface of the crown portion 606. The sole portion 608 has a sole surface 608a. The sole surface 608a is the outer surface of the sole portion 608. The hosel portion 610 has a hosel hole 612. The head 600 has a hollow portion inside. This hollow portion is surrounded by the face portion 604, the crown portion 606, and the sole portion 608. The face portion 604, the crown portion 606, and the sole portion 608 form an outer shell portion of the head 600 (head body h6).

[0138] The head 600 is a wood type head. The head 600 is a driver head.

[0139] The head 600 has a head body h6, a weight w6, a cover c6, and a screw 614 as a cover attachment member. The head body h6 has a face portion 604, a crown portion 606, a sole portion 608, and a hosel portion 610.

[0140] The weight w6 has a first contact portion 616 and a second contact portion 618. The first contact portion 616 is a first side surface (first face). The second contact portion 618 is a second side surface (second face). Furthermore, the weight w6 has a top surface 620 and a bottom surface 622. The top surface 620 faces the inner surface of the cover c6.

[0141] The head body h6 has a cavity v6. The cavity v6 is provided at the boundary between the crown portion 606 and the sole portion 608. The head 600 does not have a so-called skirt portion (side portion). In the head 600, the outer edge of the crown portion 606 is joined to the outer edge of the sole portion 608. The head 600 may have a skirt portion (side portion). In this case, the outer edge of the crown portion 606 is joined to the outer edge of the skirt portion.

[0142] The weight w6 is housed in the cavity v6. When housed in the cavity v6, the weight w6 can move inside the cavity v6. The cavity v6 guides the movement of the weight w6. The cavity v6 is a slide groove that allows the weight w6 to slide. The weight w6 moves along the longitudinal direction of the cavity v6.

[0143] As shown in FIGS. 25(a) and 25(b), the cavity v6 has a first sliding portion 630 and a second sliding portion 632. The first sliding portion 630 and the second sliding portion 632 each constitute a side surface of the cavity v6. The first sliding portion 630 and the second sliding portion 632 extend along the longitudinal direction (sliding direction) of the cavity v6. The cavity v6 constitutes a groove, with the first sliding portion 630 constituting a first side surface of the groove and the second sliding portion 632 constituting a second side surface of the groove. The cavity v6 has a bottom surface 634. In this embodiment, the first sliding portion 630 and the second sliding portion 632 are sliding surfaces. The first sliding portion 630 abuts against the first abutment portion 616 of the weight w6. This abutment is surface contact. The second sliding portion 632 abuts against the second abutment portion 618 of the weight w6. This abutment is surface contact. The weight w6 moves while being guided by the first sliding portion 630 and the second sliding portion 632.

[0144] As clearly shown in Figures 25(a) and 25(b), the cavity v6 extends from the toe side to the heel side. The weight w6 can move within a range from a first position to a second position. That is, the movable range of the weight w6 is from the first position to the second position. In Figure 25(a), the weight w6 is in the first position. This first position is the position furthest to the heel in the movable range of the weight w6. In Figure 25(b), the weight w6 is in the second position. This second position is the position furthest to the toe in the movable range of the weight w6. The cavity v6 extends so that the position of the weight w6 in the toe-heel direction can be changed.

[0145] The cavity v6 extends in a curved manner so as to be convex toward the back side of the head 600. When the weight w6 moves near the apex of this curve, the weight w6 can be positioned at the backmost position. The cavity v6 extends so that the position of the weight w6 in the face-back direction can be changed.

[0146] 25(a) and 25(b), within the movable range, surface contact is maintained between the first sliding portion 630 of the cavity v6 and the first abutting portion 616 of the weight w6. The first sliding portion 630 and the first abutting portion 616 are curved surfaces with the same curvature. Within the movable range, surface contact is maintained between the second sliding portion 632 of the cavity v6 and the second abutting portion 618 of the weight w6. The second sliding portion 632 and the second abutting portion 618 are curved surfaces with the same curvature.

[0147] As shown in Figures 25(a) and 25(b), the head main body h6 has a first cover support part 640 and a second cover support part 642. The first cover support part 640 and the second cover support part 642 each have a screw hole 644. A first end part 646 of the cover c6 is fixed to the first cover support part 640. A second end part 648 of the cover c6 is fixed to the second cover support part 642.

[0148] The cover c6 has an outer surface 650 and an inner surface 652. The outer surface 650 forms a part of the crown surface 606a. The outer surface 650 forms a part of the sole surface 608a. The inner surface 652 abuts against the weight w6.

[0149] The cover c6 has a first hole 654 and a second hole 656. The first hole 654 and the second hole 656 are through holes. The first hole 654 is provided in a first end 646 of the cover c6. The second hole 656 is provided in a second end 648 of the cover c6. The first end 646 is fixed to the head body h6 by a cover attachment member (screw) 614. At the first end 646, the screw 614 is inserted through the first hole 654 and screwed into the screw hole 644. The second end 648 is fixed to the head body h6 by the screw 614. At the second end 648, the screw 614 is inserted through the second hole 656 and screwed into the screw hole 644.

[0150] The cover c6 in the closed state covers the cavity v6. In this embodiment, the cover c6 covers the entire cover c6. In this embodiment, when the cover c6 is attached, the weight w6 is not visible.

[0151] When the cover c6 is not in the closed state, the weight w6 can move freely within the cavity v6 (see Figures 25(a) and 25(b)). When the cover c6 is in the closed state, the movement of the weight w6 within the cavity v6 is restricted. This closed state is achieved by properly tightening the screws 614. The cover c6 directly presses the weight w6. This pressure increases the static friction force between the weight w6 and the cover c6. This pressure increases the static friction force between the weight w6 and the cavity v6 (first sliding portion 630, second sliding portion 632). The pressure by the cover c6 can effectively restrict the sliding movement of the weight w6.

[0152] As shown in Figures 24, 25(a), and 25(b), the cover c6 is in an open state without being separated from the head body h6. One screw 614 can be removed from the head body h6, while the other screw 614 can remain attached to the head body h6. By loosening the other screw 614, the cover c6 can be rotated and removed from the cavity v6. In this open state, the weight w6 can be directly accessed and moved.

[0153] As described above, the cavity v6 is provided at the boundary between the crown portion 606 and the sole portion 608. As shown in FIG. 22, the cover c6 in the closed state is visible in a plan view of the head 600 seen from the crown portion 606 side. The cover c6 in the closed state is also visible in a plan view of the head 600 seen from the sole portion 608 side. The cover c6 forms the contour line k1 of the head 600 when seen from the crown side. The cover c6 forms the contour line k2 of the crown surface 606a. The contour line k2 is part of the contour line k1. The outer surface 650 forms part of the crown surface 606a. The cover c6 forms the contour line k3 of the sole surface 608a. The contour line k3 coincides with the contour line k2. The outer surface 650 forms part of the sole surface 608a.

[0154] The first hole 654 and the second hole 656 do not form the contour line k1. The first hole 654 and the second hole 656 are provided closer to the sole than the contour line k1. The first hole 654 and the second hole 656 are spaced apart from the contour line k1. The first hole 654 and the second hole 656 are spaced apart from the contour line k2. The first hole 654 and the second hole 656 are spaced apart from the contour line k3. This configuration prevents a recess from being formed in the contour line of the head, which would violate the rules of golf.

[0155] The cover c6 protrudes from the crown surface 606a. The cover c6 protrudes from the sole surface 608a. The width of the cover c6 is greater than the width of the cavity v6. Both edge portions of the cover c6 protrude from the cavity v6. Both edge portions of the cover c6 extend to positions that cover the outer surface of the head body h6. Both edge portions of the cover c6 cover the outer surface of the head body h6. The cover c6 has a crown covering portion 670 that covers the crown surface 606a. The cover c6 has a sole covering portion 672 that covers the sole surface 608a. The crown covering portion 670 extends along a first edge 674 of the cavity v6. The first edge 674 is located on the crown surface 606a. The first edge 674 is the outer edge of the crown portion 606 of the head body h6. The sole covering portion 672 extends along a second edge 676 of the cavity v6. The second edge 676 is located on the sole surface 608a and is the outer edge of the sole portion 608 of the head body h6.

[0156] The cover c6 protrudes from the crown surface 606a. The cover c6 protrudes from the sole surface 608a.

[0157] [Seventh embodiment] FIG. 26 is a perspective view of a golf club head 700 according to the seventh embodiment, viewed from the crown side.

[0158] The head 700 has a face portion (not shown), a crown portion 706, a sole portion (not shown), and a hosel portion 710. The crown portion 706 has a crown surface 706a. The crown surface 706a is the outer surface of the crown portion 706. The head 700 has a hollow portion therein. The head 700 is a wood-type head. The head 700 is a driver head.

[0159] The head 700 has a head body h7, a weight w7, a cover c7, and a screw 714 as a cover attachment member. The head body h7 has a face portion (not shown), a crown portion 706, a sole portion (not shown), and a hosel portion 710.

[0160] The head body h7 has a cavity v7. The cavity v7 is provided in the crown portion 706.

[0161] The cover c7 has a first hole 754 and a second hole 756. The first hole 754 and the second hole 756 are through holes. The first hole 754 is provided at a first end 746 of the cover c7. The second hole 756 is provided at a second end 748 of the cover c7. The first end 746 is fixed to the head body h7 by a cover mounting member (screw) 714. The second end 748 is fixed to the head body h7 by the screw 714.

[0162] When the cover c7 is not in the closed state, the weight w7 can move freely within the cavity v7. When the cover c7 is in the closed state, the movement of the weight w7 within the cavity v7 is restricted. This closed state is achieved by properly tightening the screw 714. The cover c7 directly presses the weight w7. This pressure increases the static friction force between the weight w7 and the cover c7. This pressure increases the static friction force between the weight w7 and the cavity v7. The pressure from the cover c7 can effectively restrict the sliding movement of the weight w7.

[0163] In the closed state, the cover c7 covers the cavity v7. In this embodiment, the cover c7 covers the entire cover c7.

[0164] The cover c7 is transparent. The cover c7 is transparent to the extent that the weight w7 can be seen through the cover c7. As shown in Figure 26, the weight w7 inside the cover c7 can be seen.

[0165] [Modification (cover that allows weight to be seen from outside)] Figure 27(a) is a perspective view of a modified head 7001 as viewed from the crown side, and Figure 27(b) is a perspective view of a modified head 7002 as viewed from the crown side.

[0166] The head 7001 is a modified example of the head 700 of the seventh embodiment. The head 7001 is the same as the head 700 except that a cover c71 is used instead of the cover c7. The cover c71 is not transparent. The cover c71 has a window 770. The window 770 penetrates the cover c71. The window 770 extends along the extension direction of the cover c71. The window 770 extends along the sliding direction of the weight w7. The weight w7 inside the cover c71 can be seen through the window 770. The window 770 allows the position of the weight w7 to be confirmed even when the cover c71 is closed. In Figures 27(a) and 27(b), the weight w7 visible through the window is indicated by cross-hatching. This is the same as in the other drawings of this application.

[0167] The cover c71 has a first hole 754 and a second hole 756. The first hole 754 and the second hole 756 are through holes. The first hole 754 is provided at a first end 746 of the cover c71. The second hole 756 is provided at a second end 748 of the cover c71. The first end 746 is fixed to the head body h7 by a cover mounting member (screw) 714. The second end 748 is fixed to the head body h7 by the screw 714.

[0168] The head 7002 is a modified example of the head 700 of the seventh embodiment. The head 7002 is the same as the head 700 except that a cover c72 is used instead of the cover c7. The cover c72 is not transparent. The cover c72 has a window portion 772. The window portion 772 penetrates the cover c72. The window portion 772 extends along the extension direction of the cover c72. The window portion 772 extends along the sliding direction of the weight w7. The weight w7 inside the cover c72 can be seen through the window portion 772. The window portion 772 allows the position of the weight w7 to be confirmed even when the cover c72 is closed.

[0169] The cover c72 has a first hole 754 and a second hole 756. The first hole 754 and the second hole 756 are through holes. The first hole 754 is provided at a first end 746 of the cover c72. The second hole 756 is provided at a second end 748 of the cover c72. The first end 746 is fixed to the head body h7 by a cover mounting member (screw) 714. The second end 748 is fixed to the head body h7 by the screw 714.

[0170] Like the head 7002, the window portion 772 may be divided. In other words, there may be multiple window portions 772. In other words, the window portion 772 may be interrupted in the middle. It is preferable that the window portion 772 is divided so that the weight w7 is not entirely hidden regardless of its position. The non-window portion 774 between the first window portion 772a and the second window portion 772b can increase the rigidity of the cover c72. The non-window portion 774 can increase the pressing force of the cover c72 against the weight w7.

[0171] [Modification (window)] Figure 28(a) is a perspective view of a modified head 7003 seen from the crown side, and Figure 28(b) is a perspective view of a modified head 7004 seen from the crown side.

[0172] The head 7003 is a modified example of the head 7001. In the head 7003, a cover c73 is used instead of the cover c7. The cover c73 has a window portion 774. The window portion 774 is the same as the window portion 770.

[0173] The head 7004 is a modified example of the head 7002. In the head 7004, a cover c74 is used instead of the cover c7. The cover c74 has a window portion 776. The window portion 776 is the same as the window portion 772.

[0174] The cover c73 has a first hole 784 and a second hole 786. The first hole 784 and the second hole 786 are through holes. The first hole 784 is provided at a first end 788 of the cover c73. The second hole 786 is provided at a second end 790 of the cover c73. The first end 788 is fixed to the head body by a cover mounting member (screw) 714. The second end 790 is fixed to the head body by the screw 714.

[0175] The cover c74 has a first hole 784 and a second hole 786. The first hole 784 and the second hole 786 are through holes. The first hole 784 is provided at a first end 788 of the cover c74. The second hole 786 is provided at a second end 790 of the cover c74. The first end 788 is fixed to the head body by a cover mounting member (screw) 714. The second end 790 is fixed to the head body by the screw 714.

[0176] In head 7003, the widths of the first end 788 and the second end 790 of the cover c73 are narrower than the width of the intermediate portion 789. The intermediate portion 789 is the portion between the first end 788 and the second end 790. In head 7004, the widths of the first end 788 and the second end 790 of the cover c74 are also narrower than the width of the intermediate portion 789. In contrast, in head 7001, the widths of the first end 746 and the second end 748 of the cover c71 are wider than the width of the intermediate portion 747. The intermediate portion 747 is the portion between the first end 746 and the second end 748. In head 7002, the widths of the first end 746 and the second end 748 of the cover c72 are also wider than the width of the intermediate portion 747. In this way, the widths of the covers may vary.

[0177] Figure 29(a) is a bottom view of a modified head 1001 seen from the sole side, and Figure 29(b) is a perspective view of a modified head 1002 seen from the sole side.

[0178] The head 1001 is a modified example of the head 100 of the first embodiment. The head 1001 is the same as the head 100 except that a cover c11 is used instead of the cover c1. The cover c11 is not transparent. The cover c11 has a window portion 190. The window portion 190 penetrates the cover c11. The window portion 190 extends along the extension direction of the cover c11. The window portion 190 extends along the sliding direction of the weight w1. The weight w1 inside the cover c11 can be seen through the window portion 190. The window portion 190 allows the position of the weight w1 to be confirmed even when the cover c11 is closed.

[0179] The head 1002 is a modified example of the head 1001. The head 1002 is the same as the head 1001 except that a cover c12 is used instead of the cover c71. The cover c12 has a window portion 192. The window portion 192 is divided.

[0180] [Modification (cover fixing structure)] In the above-described embodiments, the first end and the second end of the cover are fixed to the head body by screws, but the fixing structure of the cover is not limited to this.

[0181] 30, 31 and 32 are enlarged cross-sectional views of the cavity portion of the head of the modified example.

[0182] The embodiment in FIG. 30 has a cover c81 and a head body h81, and the head body h81 has a cavity v81. The head body h81 has a first cover support portion 810 and a second cover support portion 812. The first cover support portion 810 has a screw hole 814. The second cover support portion 812 does not have a screw hole. The second cover support portion 812 has a cover insertion portion 816. The cover insertion portion 816 is a recess.

[0183] The cover c81 has a first end 820 and a second end 822. The first end 820 has a screw hole. The first end 820 is fixed to the first cover support part 810. The first end 820 is screwed to the first cover support part 810. The second end 822 is fixed to the second cover support part 812. The second end 822 has an insertion end 824. The insertion end 824 has a first portion 826 that faces the inside of the head and a second portion 828 that extends from the first portion 826 along the outer surface of the head. The cover insertion part 816 has a shape corresponding to the insertion end 824. By inserting the insertion end 824 into the cover insertion part 816, movement of the second end 822 in a direction along the outer surface of the head is restricted. Furthermore, this insertion restricts movement of the second end 822 in a direction toward the outside of the head. The second end 822 is fixed to the second cover support portion 812 by inserting the insertion end 824 into the cover insertion portion 816. The second end 822 can be pulled out of the cover insertion portion 816 by loosening the screw 830 that fixes the first end 820.

[0184] The cover insertion portion 816 is configured so that the cover c81 extends along the opening of the cavity v81 when the second end 822 of the cover c81 is inserted. The cover insertion portion 816 includes an upper arrangement portion 832 located above the second end 822 (insertion end 824) of the cover c81. The upper arrangement portion 832 effectively prevents the cover c81 from opening.

[0185] The embodiment of Figure 31 has a cover c82 and a head body h82. The head body h82 has a cavity v82. The head body h82 has a first cover support portion 840 and a second cover support portion 842. The first cover support portion 840 has a screw hole 844. A hinge 846 is provided on the second cover support portion 842.

[0186] The cover c82 has a first end 850 and a second end 852. The first end 850 has a screw hole. The first end 850 is screwed to the first cover support part 840. The second end 852 is rotatably fixed to the second cover support part 852 by a hinge 846. The cover c82 rotates when the screw 854 that fixes the first end 850 is removed. This rotation allows the cover c82 to be opened or closed without separating the cover c82 from the head main body h82.

[0187] The embodiment of Figure 32 has a cover c83 and a head body h83. The head body h83 has a cavity v83. The head body h83 has a first cover support portion 860, a second cover support portion 862, and a third cover support portion 863. A first hinge 864 is provided on the first cover support portion 860. A second hinge 866 is provided on the second cover support portion 862.

[0188] The cover c83 has a first end 870 and a second end 872. The first end 870 is fixed to the first cover support part 860 by a first hinge 864. The second end 872 is fixed to the second cover support part 862 by a second hinge 866. The cover c83 is fixed to the third cover support part 863 at an intermediate position between the first end 870 and the second end 872 by a screw 874. When the screw 874 is removed, the cover c83 elastically deforms, allowing the first end 870 and the second end 872 to rotate. This rotation allows the cover c83 to be opened or closed without separating the cover c83 from the head main body h83.

[0189] The embodiment of FIG. 33(a) has a cover c84 and a head body h84. The head body h84 has a cavity v84. The head body h84 has a first cover support portion 880, a second cover support portion 881, and a third cover support portion 882. A first hinge 883 is provided on the first cover support portion 880. A second hinge 884 is provided on the second cover support portion 881. The cover c84 has a first end portion 885 and a second end portion 886. The first end portion 885 is fixed to the first cover support portion 880 by the first hinge 883. The second end portion 886 is fixed to the second cover support portion 881 by the second hinge 884. The cover c84 is fixed to the third cover support part 882 with a screw 887 at a position intermediate between the first end 885 and the second end 886. The third cover support part 882 is provided within the cavity v84, but similar to the embodiment shown in FIG. 32, it is provided at a position above the bottom surface of the cavity v84 so as not to impede the movement of the weight. The rotation axes Z1 of the two hinges 883, 884 are located on the same line. When the screw 887 is removed from the third cover support part 882, the cover c84 can be rotated around the rotation axis Z1. This rotation allows the cover c84 to be opened or closed without separating the cover c84 from the head body h84.

[0190] The embodiment of FIG. 33(b) includes a cover c85 and a head body h85. The head body h85 includes a cavity v85. The head body h85 includes a first cover support portion 890, a second cover support portion 891, and a third cover support portion 892. A first hinge 893 is provided on the first cover support portion 890. A second hinge 894 is provided on the second cover support portion 891. The cover c85 includes a first end portion 895 and a second end portion 896. The first end portion 895 is fixed to the first cover support portion 890 by the first hinge 893. The second end portion 896 is fixed to the second cover support portion 891 by the second hinge 894. A protruding extension portion 898 is formed on the cover c85 at an intermediate position between the first end portion 895 and the second end portion 896. The protruding extension 898 extends to a position outside the cavity v85. The protruding extension 898 of the cover c85 is fixed to the third cover support portion 892 with a screw 897. The third cover support portion 892 is provided outside the cavity v85. The rotation axes Z1 of the two hinges 893, 894 are located on the same straight line. When the screw 897 is removed from the third cover support portion 892, the cover c85 can be rotated around the rotation axis Z1. This rotation allows the cover c85 to be opened or closed without separating the cover c85 from the head main body h85.

[0191] [Modification (structure in which the weight penetrates the cavity)] The embodiment of Figure 34(a) has a cover c91 and a weight w91. The head body h91 has a cavity v91. The weight w91 has an extension portion 904. The extension portion 904 is provided on the bottom surface 922 of the weight w91. The cavity v91 has an opening 906. The opening 906 extends along the trajectory of the sliding movement of the weight w91 and forms a slit. The opening 906 is provided in a wall portion 902 that forms (the bottom surface of) the cavity v91. The extension portion 904 of the weight w91 extends through the opening 906. The extension portion 904 penetrates the opening 906 (wall portion 902) and reaches the inside of the head (hollow portion S1). The first contact portion 916 of the weight w91 contacts the first sliding portion 930 of the cavity v91, and the second contact portion 918 of the weight w91 contacts the second sliding portion 932. The opening 906 reduces the weight of the cavity v91. The extension portion 904 increases the weight of the weight w91, increasing the degree of freedom in adjusting the center of gravity of the head.

[0192] The embodiment of Figure 34(b) is a modified example of Figure 34(a). In this embodiment, a weight w92 is provided in place of the weight w91. This weight w92 has a weight main body 910 and a high specific gravity portion 912. The specific gravity of the high specific gravity portion 912 is greater than the specific gravity of the weight main body 910. The extension portion 904 includes the high specific gravity portion 912. The high specific gravity portion 912 further increases the weight of the weight w92, thereby increasing the degree of freedom in adjusting the center of gravity of the head.

[0193] [Modification (reversible weight) The embodiment of Figure 35 is a modified example of the first embodiment. This embodiment has the same head body h1, cavity v1, and cover c1 as the first embodiment. The only difference from the first embodiment is the weight. The weight w1 of the first embodiment has been changed to a weight w93. The weight w93 has a first portion 940 and a second portion 942. The weight w93 is symmetrical up and down. The weight w93 is symmetrical across a plane. The plane of symmetry is the boundary plane m1 between the first portion 940 and the second portion 942. The first portion 940 and the second portion 942 have different specific gravities.

[0194] The weight w93 can be attached to the cavity v1 upside down. In the first position of the weight w93 shown in FIG. 35, the second portion 942 is located below the first portion 940. In this first position, the second portion 942 abuts against the cavity v1. In this first position, the first portion 940 does not abut against the cavity v1. More specifically, a first abutment portion (first side surface) 942a of the second portion 942 abuts against the first sliding portion 130, and a second abutment portion (second side surface) 942b of the second portion 942 abuts against the second sliding portion 132. The first abutment portion (first side surface) 940a of the first portion 940 does not abut against the cavity v1, and the second abutment portion (second side surface) 940b of the first portion 940 does not abut against the cavity v1 either. That is, the first portion 940 does not abut against the cavity v1.

[0195] When the weight w93 is turned upside down from the state shown in FIG. 35, the weight w93 assumes a second position. In this second position, the first portion 940 is positioned below the second portion 942. In this second position, the first portion 940 abuts against the cavity v1. In this second position, the second portion 942 does not abut against the cavity v1. More specifically, a first abutment portion (first side surface) 940a of the first portion 940 abuts against the first sliding portion 130, and a second abutment portion (second side surface) 940b of the first portion 940 abuts against the second sliding portion 132. In this case, the first abutment portion (first side surface) 942a of the second portion 942 does not abut against the cavity v1, and the second abutment portion (second side surface) 942b of the second portion 942 does not abut against the cavity v1 either. That is, the second portion 942 does not abut against the cavity v1.

[0196] Depending on the shape of cavity v1, in the first posture, the first portion 940 may also abut against cavity v1 in addition to the second portion 942. As shown in Fig. 35, the first abutting portion 940a of the first portion 940 is slightly separated from the first sliding portion 130, but when the first sliding portion 130 is perpendicular to the boundary surface m1, the first abutting portion 940a may abut against the first sliding portion 130 in the first posture.

[0197] By turning the weight w93 upside down, the position of the center of gravity of the weight w93 relative to the cavity v1 changes. Therefore, by turning the weight w93 upside down, the position of the center of gravity of the head changes.

[0198] It is preferable that the weight w93 be turned upside down so that the center of gravity of the weight w93 changes in the vertical direction. For example, the specific gravity of the first portion 940 can be made different from the specific gravity of the second portion 942.

[0199] FIG. 36(a) is a cross-sectional view of a screw 950 serving as a cover attachment member and its vicinity. The screw 950 secures the cover c95 to the head body h95. The screw 950 has a head 952 and a shaft 954. A bottom surface 952a of the head 952 extends perpendicular to the center line of the shaft 954. A side surface 952b of the head 952 extends parallel to the center line of the shaft 954. The shaft 954 has a male thread. When the screw 950 is fastened, the cover c95 is placed in a closed state. In this closed state, the screw 950 does not protrude from the cover c95. The cover c95 has a recess 956 that accommodates the head 952 and a receiving portion 958 that is pressed by the bottom surface 952a of the head 952 accommodated in the recess 956.

[0200] FIG. 36(b) is a cross-sectional view of the vicinity of a screw 960 of a modified example. The screw 960 secures the cover c96 to the head body h96. The screw 960 has a head 962 and a shaft 964. A bottom surface 962a of the head 962 extends in a direction perpendicular to the center line of the shaft 964. A side surface 962b of the head 962 is tapered. The side surface 962b of the head 962 extends in a direction inclined with respect to the center line of the shaft 964. The side surface 962b is inclined so as to approach the center line of the shaft 964 as it approaches the shaft 964 side. The side surface 962b forms a conical convex surface. The shaft 964 has a male thread portion. When the screw 960 is fastened, the cover c96 is in a closed state. In this closed state, the screw 960 does not protrude from the cover c96. The cover c96 has a recess (hole) 966 that accommodates the head 962, and a receiving portion 968 that is pressed by a side surface 962b of the head 962 accommodated in the recess 966. The receiving portion 968 has a sloped surface 968a that comes into contact with the side surface 962b. The sloped surface 968a forms a conical concave surface.

[0201] As shown in Figures 30 to 32, in the closed state, the screw may protrude from the cover. Preferably, in the closed state, the screw 950 (head 952) does not protrude from the cover c95. In the first to seventh embodiments described above, the screw for fastening the cover does not protrude from the cover. If the side surface 962a of the head 962 is inclined as in the embodiment of Figure 36(b), the side surface 962a can hold the cover c96. In this case, it is not necessary to provide the cover c96 between the bottom surface 962a and the head main body h96. This allows the cover c96 to be made thinner, increasing the design freedom of the cover c96.

[0202] [Action and effect] The above-described embodiments provide the following advantages.

[0203] In the first to seventh embodiments, the cover in the closed state applies a pressing force to the weight. This increases static friction between the weight and the cavity and between the weight and the cover. This allows the weight to be fixed in position without providing an engagement structure between the weight and the cavity to fix the weight's position. Furthermore, the weight can be released by simply opening the cover.

[0204] In the first to seventh embodiments, the weight is placed in the cavity. Simply by placing the weight, it is possible for the weight to slide within the cavity. Therefore, the weight can be easily attached and detached. The weight can also be easily replaced. The weight can also be easily slid by simply pushing the weight.

[0205] In the first to seventh embodiments, the abutting portion of the weight abuts against the sliding portion of the cavity. When the weight slides, the abutting portion slides relative to the sliding portion. This configuration easily achieves a sliding structure that allows the weight to be easily attached and detached and allows for sliding movement.

[0206] In the first to seventh embodiments, the cavity forms a slide groove for sliding the weight. The weight has a shape that allows it to slide in the slide groove. Therefore, a structure is realized that allows the weight to slide and that makes it easy to attach and detach the weight.

[0207] In the first to seventh embodiments, the abutment portion of the weight has a first abutment portion and a second abutment portion, and the sliding portion of the cavity has a first sliding portion and a second sliding portion. The first abutment portion is a first side surface of the weight, and the second abutment portion is a second side surface of the weight. Furthermore, the first sliding portion of the cavity is a first side surface of the slide groove, and the second sliding portion of the cavity is a second side surface of the slide groove. Thus, a structure is realized that allows the weight to slide and facilitates attachment and detachment of the weight.

[0208] The first and second sliding portions of the cavity are tapered. The distance between the first and second sliding portions narrows as it goes downward. The distance between the first and second sliding portions narrows as it goes closer to the bottom of the cavity. The weight also has a tapered shape. The distance between the first and second contact portions narrows as it goes downward. Therefore, the weight is stably supported by the cavity, allowing it to slide smoothly. In addition, the cover applies a pressing force to the weight, which increases the static friction between the weight and the cavity.

[0209] In the first to seventh embodiments, the shape of the contact portion of the weight follows the shape of the sliding portion of the cavity. In these embodiments, the contact portion of the weight is a curved surface, constituting a contact curved surface. The sliding portion of the cavity is also a curved surface, constituting a sliding curved surface. These curved surfaces enable the weight to slide smoothly. From the viewpoint of improving the smoothness of sliding, the curvature of this sliding curved surface is preferably approximately constant, more preferably constant. "Approximately constant" means that an error of ±5%, more preferably ±3%, is allowed. However, even if the curvature of the sliding curved surface fluctuates, the weight can slide stably by contacting the sliding curved surface at three points. From the viewpoint of improving the smoothness of sliding, the curvature of the sliding curved surface is preferably approximately consistent with the curvature of the contact curved surface, more preferably consistent. "Approximately consistent" means that an error of ±5%, more preferably ±3%, is allowed. However, even if the curvature of the sliding curved surface and the curvature of the contact curved surface are different, the weight can contact the sliding curved surface at three points and slide stably.

[0210] More specifically, in the first to seventh embodiments, the first sliding portion and the second sliding portion of the cavity are curved surfaces, constituting the first sliding curved surface and the second sliding curved surface, respectively. The first abutting portion and the second abutting portion of the weight are also curved surfaces, constituting the first abutting curved surface and the second abutting curved surface, respectively. From the viewpoint of enhancing the smoothness of sliding, it is preferable that the curvatures of the first sliding curved surface and the second sliding curved surface are substantially constant, and more preferably constant. From the viewpoint of enhancing the smoothness of sliding, it is preferable that the curvature of the first sliding curved surface and the curvature of the first abutting curved surface are substantially the same, and more preferably they are the same.

[0211] As shown in the embodiments of Figures 8 to 10, the shape of the contact portion of the weight does not have to follow the shape of the sliding portion of the cavity. In this case, it is preferable that there are three or more contact points between the contact portion of the weight and the sliding portion of the cavity at any position within the movable range of the sliding movement. In these embodiments, there are three contact points at any position within the movable range of the sliding movement. Support at three or more points stabilizes the posture of the weight, enabling smooth sliding. In this case, there is no need to make the curvature of the wall surface of the cavity approximately constant, which increases the design freedom of the cavity. Furthermore, the dimensional accuracy of the cavity is relaxed.

[0212] In the first to seventh embodiments, the contact between the weight and the cavity during sliding movement is only between the contact portion and the sliding portion, so a sliding mechanism is constructed that allows the weight to be easily attached and detached, and the pressing force of the cover increases the contact pressure at that contact, fixing the position of the weight.

[0213] In the first to seventh embodiments, the weight is attached to the cavity in a state in which it can fall out of the cavity due to gravity, so that the weight can be easily attached, detached, and slid.

[0214] In the first to seventh embodiments, the sliding movement of the weight is prevented only by static friction force increased by the pressing force of the cover. Therefore, in a sliding mechanism that allows the weight to be easily attached, detached, and slid, the weight can be fixed by the cover. This static friction force occurs at the contact point between the weight and the cavity and at the contact point between the weight and the cover.

[0215] As shown in Figures 11(a) to 11(e), the cover may have a cover engagement shape that engages with the weight at each of multiple positions during sliding movement. The weight may also have a weight engagement shape that engages with the cover engagement shape when the cover is closed. The engagement between the cover engagement shape and the weight engagement shape allows the weight to be fixed at multiple positions during sliding movement. The combined effect of the pressing force of the cover and this engagement enhances the fixation of the weight. Furthermore, this engagement allows the weight to be fixed by the cover even without pressing force from the cover. The cover engagement shape and the weight engagement shape are not limited, and may be any shape that creates an engagement that restricts the movement of the weight. For example, one of the cover engagement shape and the weight engagement shape may be convex and the other concave. The cover engagement may have multiple convex or concave portions at different positions in the sliding direction of the weight. One example of a preferred cover engagement shape is multiple cover recesses or cover protrusions formed at multiple positions in the sliding direction of the weight. An example of a preferred weight engagement shape is a weight protrusion or a weight recess that engages with a cover recess or a cover protrusion.

[0216] As in the second, fourth, fifth, and seventh embodiments, at least a portion of the weight may be visible when the cover is in the closed state. This visibility is also achieved in Figures 27(a), (b), 28(a), (b), and 29(a), (b). In this case, the position of the weight can be confirmed when the cover is in the closed state. Examples of configurations that allow the weight to be visible include the following. (a) Part of the weight is exposed to the outside. (b) The cover has a window through which a portion of the weight can be seen. (c) The cover is transparent, and at least a portion of the weight is visible through the cover. (d) There is a gap between the closed cover and the cavity, and the weight can be seen through this gap.

[0217] Configurations (a), (b), (c), and (d) are established when the cover is in the closed state. Configurations (a), (b), (c), and (d) are preferably established regardless of the position of the weight within the movable range of the sliding movement. The second, fourth, and fifth embodiments include configuration (a). The embodiments of Figures 27(a), (b), 28(a), (b), and 29(a), (b) include configuration (b). The fourth embodiment also includes configuration (b). The seventh embodiment includes configuration (c). The second embodiment includes configuration (d).

[0218] A display unit may be provided on the weight. If the weight is visible from the outside when the cover is closed, the display unit on the weight may be provided in a position visible from the outside of the weight. The display unit may be provided on at least a part of the weight and be a part that can be identified visually. Examples of the display unit include letters, symbols, lines, etc. The lines include scales. In the seventh embodiment of Figure 26, a display unit s1 is provided in a position that can be seen from the outside of the cover. This display unit s1 is a line. The display unit s1 may be provided in one location or in multiple locations. In the embodiment of Figure 26, a single display unit s1 is provided. The display unit s1 makes it easy to identify the position of the weight.

[0219] A display unit may be provided on the head body or the cover. The display unit on the head body is preferably provided near the cavity. Examples of this display unit include letters, symbols, lines, etc. The lines include scales. In the embodiment of Figure 26, a display unit s2 is provided on the head body. This display unit s2 is in the form of letters. The display unit s2 may be provided in one location or in multiple locations. By checking the positional relationship between the display unit s2 and the display unit s1, the identification of the weight position is improved. In the embodiment of Figure 26, the display unit s2 includes information regarding head performance that changes depending on the weight position.

[0220] As shown in the second, fourth, and fifth embodiments, the weight may have a weight engagement portion that engages with the cover, and the cover may have a cover engagement portion that engages with the weight engagement portion. This engagement between the weight engagement portion and the cover engagement portion is maintained at all positions within the range of movement of the weight. This engagement does not interfere with the sliding movement of the weight. From the viewpoint of enabling such engagement, it is preferable that the cover engagement portion extend along the trajectory of the sliding movement of the weight. In the above embodiments, slits, ridges, and edges on both sides of the cover are used as examples of this cover engagement portion. The weight engagement portion is configured to maintain engagement with the cover engagement portion at all positions during the sliding movement of the weight.

[0221] The weight is attached to the cover by engaging the weight engaging portion with the cover engaging portion so that it does not separate from the cover. Therefore, even if the weight comes out of the cavity, it will not fall because it is held by the cover.

[0222] In the fifth embodiment, the weight can take a first position and a second position obtained by inverting the first position upside down. The weight has a shape that allows it to slide in the cavity in either the first position or the second position. In the embodiment of FIG. 35, the weight can also take a first position and a second position obtained by inverting the first position upside down. Inverting the weight upside down can move the center of gravity of the weight relative to the cavity. That is, inverting the weight upside down can move the center of gravity of the weight relative to the head body. As a result, the center of gravity of the head can move. If the center of gravity of the weight is off the symmetry plane of the weight, inverting the weight upside down can move the center of gravity.

[0223] By inverting the weight upside down, the center of gravity of the head can be changed. The center of gravity of the head can be adjusted by moving the weight, but by adding the inversion of the weight upside down, the degree of freedom in adjusting the center of gravity of the head is increased. In addition, by changing the appearance (color, etc.) of the first and second parts of the weight, a visual effect can be obtained. When either the first or second part is visible, as in the fifth embodiment, this visual effect is enhanced.

[0224] The width of the cover may be different between the end portions and the middle portion. As in the second and seventh embodiments, the width of the end portions of the cover may be larger than the width of the middle portion of the cover. In the embodiment of Figures 27(a) and 27(b), the width of the end portions of the cover is also larger than the width of the middle portion of the cover. These end portions are fixed to the head body by cover mounting members. By increasing the width of the end portions, the strength and rigidity of the cover in the vicinity of the cover mounting members can be increased. Furthermore, as in the sixth embodiment, the width of the end portions of the cover may be smaller than the width of the middle portion of the cover. In the embodiment of Figures 28(a) and 28(b), the width of the end portions of the cover is also smaller than the width of the middle portion of the cover. With this configuration, the weight of the cover can be reduced by reducing the width of the end portions while ensuring the necessary width in the middle portion of the cover. This width may change suddenly or gradually.

[0225] As in the first to seventh embodiments, both ends of the cover (first end and second end) may be fixed to the head body with screws. The pressing force from the cover to the weight can be increased by tightening the screws. Furthermore, the cover can be separated from the head body by removing both screws. Furthermore, by removing only the first screw and loosening the second screw, the cover can be rotated around the second screw (see FIG. 24). Therefore, the weight can be moved with the cover in the open position without separating the cover from the head body. In this case, the shank (male threaded portion) of the second screw can be made longer than the shank (male threaded portion) of the first screw. This configuration makes it easy to remove the first screw while the head of the second screw is raised.

[0226] As in the embodiment of Figure 31, the first end of the cover may be fixed to the head body with a screw, and the second end of the cover may be rotatably fixed to the head body with a hinge. In this configuration, the cover can be rotated by removing the screw at the first end. The cover can be easily opened and closed without separating it from the head body.

[0227] As in the embodiment of Figure 30, the first end of the cover may be fixed to the head body with a screw, and the second end of the cover may be inserted into a cover insertion portion of the head body. In this case, the cover can be opened by simply loosening the screw on the first end and pulling the second end out of the cover insertion portion, and the cover can be closed by performing the reverse operation.

[0228] As in the embodiment of Figure 32, both ends of the cover may be movably attached to the head body with hinges. In this case, the middle part of the cover may be fixed to the head body with a screw. Simply by removing the screw, the cover can be opened and closed while elastically deforming. The screw increases the pressing force on the weight.

[0229] The cover is fixed to the head body at multiple locations. In the embodiments of Figures 30 to 32, the cover can also be rotated around one end. This rotation makes it easy to open and close the cover while it is attached to the head body. It is preferable that the cover mounting member (screw) that separates from the head body during this rotation does not fall off the cover.

[0230] As shown in the first to seventh embodiments and Fig. 31, a first end of a cover may be fixed to the head body by a first cover mounting member, a second end of the cover may be fixed to the head body by a second cover mounting member, and the cover may be configured to be rotatable about the second end when the first cover mounting member is removed. As shown in the first to seventh embodiments, the first cover mounting member may be a screw, and the second cover mounting member may be a screw. As shown in Fig. 31, the first cover mounting member may be a screw, and the second cover mounting member may be a hinge.

[0231] The cavity, the weight, or the cover may have a magnetic material. The magnetic material may be, for example, in the form of a sheet. The magnetic material may be, for example, disposed on the bottom surface of the cavity. The cavity and the weight may be attracted to each other by magnetic force. The magnetic material may be disposed on the inner surface of the cover. The magnetic material may be dispersedly disposed on the cover. The cover and the weight may be attracted to each other by magnetic force. The magnetic force can prevent the weight from falling off when the cover is opened.

[0232] The kit including the golf club head may have an access tool that can access the cover attachment member. This access tool may be, for example, a tool that can turn a screw. This access tool may have a magnetic material. This access tool may be attracted to the weight by magnetic force. This magnetic force allows the weight to be moved without opening the cover. A slit or groove may be provided in the cover, and the weight may be moved by the magnetic force by moving the access tool along this slit or groove. In this case, the groove does not need to penetrate the cover. It is possible to move the weight without touching it.

[0233] The elastic body is exemplarily shown in the first embodiment, but may also be applied to other embodiments. The elastic body is preferably provided in a portion where contact pressure increases due to the pressing force of the cover. The elastic body enhances the effect of restricting the movement of the weight. It also suppresses rattle of the weight. Examples of portions where contact pressure increases include the contact surface between the cover and the weight and the contact surface between the weight and the cavity. At least a portion of the cover may be an elastic body, at least a portion of the weight may be an elastic body, or at least a portion of the cavity may be an elastic body. The elastic body may be independent. These configurations include cases where the material of the cover, the weight, or the cavity itself is an elastic body. When the elastic body is not independent, it is prevented from falling off independently. The elastic body may be a thin film such as paint. Preferably, the elastic body is provided as a layer. The elastic body may have an elastic body engagement shape that engages with the weight engagement shape.

[0234] Examples of the elastic material include elastomers. Examples of elastomers include thermosetting elastomers and thermoplastic elastomers. Examples of thermosetting elastomers include rubber. Examples of thermoplastic elastomers include polystyrene elastomers (TPS), olefin / alkene elastomers (TPO), polyvinyl chloride elastomers (TPVC), polyurethane elastomers (TPU), polyester elastomers (TPEE or TPC), and polyamide elastomers (TPAE).

[0235] The depth of the cavity may or may not be constant. In other words, the depth of the cavity may vary. The head has a three-dimensional shape with a free-form outer surface. From the viewpoint of forming a cavity in this head with a curved surface of constant curvature (such as a conical surface) and maintaining a constant cavity width, it is preferable to vary the depth of the cavity. The depth of the cavity is measured in a cross section perpendicular to the sliding movement of the weight. This depth is measured in the cross section along a direction perpendicular to the line connecting the two edges that form the upper end of the cavity.

[0236] In the first to seventh embodiments, the cover can be separated from the head body. By removing two screws from the head body, the cover can be separated from the head body. In this case, for example, the cover can be replaced. By replacing the cover with one of a different weight, the head weight can be adjusted. Furthermore, by replacing both the cover and the weight while keeping the total weight of the cover and weight the same, the position of the center of gravity of the head can be adjusted without changing the head weight.

[0237] The weight may be made up of multiple members. In the second, third, and fifth embodiments, the weight is made up of three members. In these embodiments, the weight body has two divided bodies and a connecting member that connects these divided bodies. In the fourth embodiment, the weight is made up of two members. By making the weight up of multiple members, it becomes easy to inseparably engage the cover and the weight.

[0238] As in the fifth embodiment and the embodiment of FIG. 35, the weight may have a vertically symmetrical shape. In this case, the weight may differ between the first member and the second member. This difference in weight can be achieved by the specific gravity of the material, the presence or absence and volume of a hollow portion, the presence or absence and ratio of porosity, etc. As described above, this vertically symmetrical shape allows the weight to be used upside down, which has the effect of adjusting the center of gravity.

[0239] As in the fourth and fifth embodiments and the embodiments of Figures 27(a) to 29(b), at least one slit may be provided in the cover. This slit may lighten the cover and create excess weight. This slit also allows the weight to be visible from the outside of the cover.

[0240] A sensor may be provided inside the weight. Examples of this sensor include an acceleration sensor such as a 3-axis acceleration sensor, a gyro sensor (angular velocity sensor), a GPS sensor, and a 6-axis sensor. GPS stands for Global Positioning System. This sensor can measure the swing or head behavior.

[0241] Examples of materials for the cover include metals and non-metals. Considering moldability and ease of opening and closing, non-metals are preferred. An example of a non-metal is resin. The specific gravity of the cover is preferably smaller than that of the head body. By making the cover lighter, the excess weight can be distributed to the head body, increasing the design freedom of the head body.

[0242] From the viewpoint of the degree of freedom in adjusting the center of gravity, the actual movable distance of the center of gravity of the weight during the sliding movement is preferably 20 mm or more, more preferably 30 mm or more, and even more preferably 40 mm or more. Considering the constraints of the head volume, this actual movable distance is preferably 120 mm or less, more preferably 110 mm or less, and even more preferably 100 mm or less. This actual movable distance is the distance traveled along the path of the sliding movement of the center of gravity of the weight.

[0243] From the viewpoint of adjusting the center of gravity of the head in the toe-heel direction, the movable distance of the center of gravity of the weight in the toe-heel direction during the sliding movement is preferably 15 mm or more, more preferably 25 mm or more, and even more preferably 35 mm or more. Considering the constraints of the head volume, this movable distance is preferably 115 mm or less, more preferably 105 mm or less, and even more preferably 95 mm or less.

[0244] From the viewpoint of adjusting the center of gravity of the head in the face-back direction, the movable distance of the center of gravity of the weight in the slide movement in the face-back direction is preferably 5 mm or more, more preferably 7 mm or more, and still more preferably 10 mm or more. Considering the constraints of the head volume, this movable distance is preferably 80 mm or less, more preferably 70 mm or less, and still more preferably 60 mm or less.

[0245] From the viewpoint of increasing the depth of the center of gravity, the minimum value of the distance between the face center Fc and the center of gravity of the weight, which changes during the sliding movement, is preferably 20 mm or more, more preferably 25 mm or more, and even more preferably 30 mm or more. Considering the constraints of the head volume, the maximum value of the distance between the face center Fc and the center of gravity of the weight, which changes during the sliding movement, is preferably 110 mm or less, more preferably 105 mm or less, and even more preferably 100 mm or less.

[0246] The following notes are provided regarding the above-described embodiments. [Appendix 1] a head body having a cavity; a weight removably attached to the cavity; a cover that is attached to the head body in an openable and closable manner and that covers at least a part of the cavity in a closed state; It has the weight is attached to the cavity in a state in which it can slide within the cavity, In the closed state, the cover applies a pressing force to the weight. [Appendix 2] The weight has an abutment portion, the cavity has a sliding portion that abuts against the abutting portion, 2. The golf club head according to claim 1, wherein the contact portion slides relative to the sliding portion during the sliding movement. [Appendix 3] The cavity forms a slide groove for sliding the weight, 3. The golf club head according to claim 2, wherein the weight has a shape that allows sliding movement in the slide groove. [Appendix 4] the abutment portion has a first abutment portion and a second abutment portion, the sliding portion has a first sliding portion that contacts the first contact portion and a second sliding portion that contacts the second contact portion, the first contact portion is a first side surface of the weight, the second contact portion is a second side surface of the weight, the first sliding portion is a first side surface of the slide groove, 4. The golf club head according to claim 3, wherein the second sliding portion is a second side surface of the slide groove. [Appendix 5] The shape of the contact portion does not conform to the shape of the sliding portion, 3. The golf club head according to claim 2, wherein the abutting portion and the sliding portion contact each other at three or more points at any position within the movable range of the sliding movement. [Appendix 6] 6. The golf club head according to any one of claims 2 to 5, wherein the contact between the weight and the cavity during the sliding movement is only the contact between the abutting portion and the sliding portion. [Appendix 7] 7. The golf club head according to any one of claims 1 to 6, wherein the weight is attached to the cavity in a state in which it can fall out of the cavity due to gravity when the cover is in the open state. [Appendix 8] 8. The golf club head according to any one of claims 1 to 7, wherein the sliding movement of the weight is prevented only by static friction force increased by the pressing force. [Appendix 9] The cover has a cover engagement shape that engages with the weight at each of a plurality of positions during the sliding movement, 9. The golf club head according to any one of claims 1 to 8, wherein the weight has a weight engagement shape that engages with the cover engagement shape when the cover is in the closed state. [Appendix 10] 10. The golf club head according to any one of claims 1 to 9, wherein at least a portion of the weight is visible when the cover is in the closed state. [Appendix 11] 11. The golf club head according to claim 10, wherein a portion of the weight is exposed to the outside when the cover is in the closed state. [Appendix 12] the cover has a window portion, 11. The golf club head according to claim 10, wherein when the cover is in the closed state, a portion of the weight is visible through the window at any position within the movable range of the sliding movement. [Appendix 13] At least a portion of the cover is transparent, 11. The golf club head according to claim 10, wherein when the cover is in the closed state, at least a portion of the weight is visible through the cover at any position within the range of movement of the sliding movement. [Appendix 14] The weight has a weight engagement portion that engages with the cover, The cover has a cover engaging portion that engages with the weight engaging portion, The engagement between the weight engagement portion and the cover engagement portion is maintained at all positions within the movable range of the slide movement, 14. The golf club head according to any one of claims 1 to 13, wherein the weight is attached to the cover so as not to separate from the cover by engagement between the weight engagement portion and the cover engagement portion. [Appendix 15] 15. The golf club head according to any one of claims 1 to 14, wherein the weight has a shape that allows the sliding movement in both a first position and a second position that is the upside-down inversion of the first position. [Appendix 16] 16. The golf club head according to claim 15, wherein the position of the center of gravity of the head changes when the head is turned upside down. [Appendix 17] 17. The golf club head according to any one of claims 1 to 16, wherein an elastic body is provided at a location where the contact pressure increases due to the pressing force. [Appendix 18] a first end of the cover is fixed to the head body by a first cover mounting member; a second end of the cover is fixed to the head body by a second cover mounting member; 18. The golf club head according to any one of claims 1 to 17, wherein the cover can rotate about the second end portion when the first cover attachment member is removed. [Appendix 19] the first cover attachment member is a screw, 19. The golf club head according to claim 18, wherein the second cover attachment member is a screw. [Appendix 20] the first cover attachment member is a screw, 19. The golf club head according to claim 18, wherein the second cover attachment member is a hinge. [Appendix 21] a head body having a cavity; a weight removably attached to the cavity; a cover that is attached to the head body in an openable and closable manner and that covers at least a part of the cavity in a closed state; It has the weight is attached to the cavity in a state in which it can slide within the cavity, The cover has a cover engagement shape that can engage with the weight at each of a plurality of positions during the sliding movement, The golf club head has a weight engagement shape that engages with the cover engagement shape of the cover in the closed state. [Appendix 22] the cover engagement shape is a plurality of cover recesses or cover protrusions formed at a plurality of positions during the sliding movement, 22. The golf club head according to claim 21, wherein the weight engagement shape is a weight protrusion or a weight recess that engages with the cover recess or the cover protrusion. [Appendix 23] a head body having a cavity; a weight placed in the cavity; a cover that is attached to the head body in an openable and closable manner and that covers at least a part of the cavity in a closed state; It has the weight is placed in the cavity in a state in which it can slide within the cavity, In the closed state, the cover applies a pressing force to the weight. [Explanation of symbols]

[0247] 100, 200, 300, 400, 500, 600, 700... head h1, h2, h3, h4, h5, h6, h7... Head body c1, c2, c3, c4, c5, c6, c7...cover v1, v2, v3, v4, v5, v6, v7...cavity w1, w2, w3, w4, w5, w6, w7... weights 116...1st contact part (contact part) 118...Second contact part (contact part) 130 First sliding part (sliding part) 132 Second sliding part (sliding part)

Claims

1. a head body having a cavity; a weight removably attached to the cavity; a cover that is attached to the head body in an openable and closable manner and that covers at least a part of the cavity in a closed state; It has the weight is attached to the cavity in a state in which it can slide within the cavity, In the closed state, the cover applies a pressing force to the weight, The weight has an abutment portion, the cavity has a sliding portion that abuts against the abutting portion, In the sliding movement, the contact portion slides relative to the sliding portion, The cavity forms a slide groove for sliding the weight, The weight has a shape that allows it to slide in the slide groove, the abutment portion has a first abutment portion and a second abutment portion, the sliding portion has a first sliding portion that contacts the first contact portion and a second sliding portion that contacts the second contact portion, the first contact portion is a first side surface of the weight, the second contact portion is a second side surface of the weight, the first sliding portion is a first side surface of the slide groove, the second sliding portion is a second side surface of the slide groove, the slide groove of the cavity has a first taper in which the distance between the first side surface and the second side surface gradually narrows toward the inside of the head body, The abutment portion of the weight has a second taper in which the distance between the first side surface and the second side surface gradually narrows, The golf club head has the weight fitted into the cavity by the second taper fitting into the first taper.

2. 2. The golf club head according to claim 1, wherein the contact between the weight and the cavity during the sliding movement is only between the abutting portion and the sliding portion.

3. 3. The golf club head according to claim 1, wherein the weight is attached to the cavity in a state in which the weight can fall out of the cavity by gravity when the cover is in an open state.

4. 4. The golf club head according to claim 1, wherein the sliding movement of the weight is prevented only by static friction force increased by the pressing force.

5. The cover has a cover engagement shape that engages with the weight at each of a plurality of positions during the sliding movement, 4. The golf club head according to claim 1, wherein the weight has a weight engagement shape that engages with the cover engagement shape when the cover is in the closed state.

6. The golf club head according to claim 1 , wherein at least a portion of the weight is visible when the cover is in the closed state.

7. 7. The golf club head according to claim 6, wherein a portion of the weight is exposed to the outside when the cover is in the closed state.

8. the cover has a window portion, 7. The golf club head according to claim 6, wherein when the cover is in the closed state, a portion of the weight is visible through the window at any position within the movable range of the sliding movement.

9. At least a portion of the cover is transparent, 7. The golf club head according to claim 6, wherein when the cover is in the closed state, at least a portion of the weight is visible through the cover at all positions within the range of movement of the sliding movement.

10. The weight has a weight engagement portion that engages with the cover, The cover has a cover engaging portion that engages with the weight engaging portion, The engagement between the weight engagement portion and the cover engagement portion is maintained at all positions within the movable range of the slide movement, 10. The golf club head according to claim 1, wherein the weight is attached to the cover so as not to be separated from the cover by engagement between the weight engaging portion and the cover engaging portion.

11. 11. The golf club head according to claim 1, wherein the weight has a shape that allows the sliding movement in both a first position and a second position that is the upside-down position of the first position.

12. The golf club head according to claim 11, wherein the position of the center of gravity of the head is changed by the upside-down inversion.

13. 13. The golf club head according to claim 1, wherein an elastic body is provided at a portion where the contact pressure increases due to the pressing force.

14. a first end of the cover is fixed to the head body by a first cover mounting member; a second end of the cover is fixed to the head body by a second cover mounting member; 14. The golf club head according to claim 1, wherein the cover is rotatable about the second end when the first cover mounting member is removed.

15. the first cover attachment member is a screw, 15. The golf club head of claim 14, wherein the second cover attachment member is a screw.

16. the first cover attachment member is a screw, 15. The golf club head of claim 14, wherein the second cover attachment member is a hinge.

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