JP6639062B2 - Hollow golf club head and sole member attached to and detached from the hollow golf club head - Google Patents

Description

The present invention relates to a hollow golf club head, and more particularly, to a hollow golf club head that enables a sole portion to be detached and replaced according to a user's preference, and a detachable removable golf club head used in such a hollow golf club head. It relates to a sole member.
The hollow golf club head in the present invention is defined as a so-called fairway wood and a golf club head called a utility.

  2. Description of the Related Art Generally, a metal golf club head having a hollow structure (hollow golf club head; hereinafter, also referred to as a "head") is an integrated body formed by joining a plurality of outer shells (a face portion, a crown portion, a sole portion, and the like). It has a structure. Normally, the outer shell constituting the head is formed by casting, forging, or the like, and the head is formed by integrating the outer shells by welding, bonding, or the like.

  Alternatively, a part of the outer shell may be replaced with another integrated outer shell (hereinafter, the outer shell forming the head, in which a part of the outer shell is removed) A head is also known in which the head is fixed to a head body by a joining member such as a pin. For example, in Patent Document 1, the head is made up of two parts, an upper part (head body) excluding the sole part, and a lower part (sole part) formed separately from the upper part, and an upper part that becomes the head body Discloses a configuration in which a lower portion that is a sole portion is joined to be integrated. The joining surface of the upper portion and the joining surface of the lower portion are each formed in a single plane, and the two are joined in a single plane, and the head is manufactured by joining with a plurality of fastening members (bolts). Is done.

  Further, for example, Patent Document 2 discloses a head structure in which an opening is formed in the lower surface of a head body, and a plate-shaped sole member having a weight member fixed to the opening is joined by a fastening member made of a screw. Have been. The head body and the sole member are formed with two recesses on both sides on the face side and one place on the center on the back side, respectively, and the screw is screwed into the receiving cylinder formed on the head body side. By doing so, the two are joined to produce a head.

JP 2002-528238A JP-A-2007-136068

  The sole portion disclosed in Patent Document 1 described above has a structure in which flat surfaces are flush with each other and a bolt is screwed in from a vertical direction, so that a large force is concentrated on the bolt portion at the time of hitting a ball, and the bonding strength is increased. In addition, it is necessary to increase the size and number of bolts. In particular, if the position of the hole into which the bolt is inserted is not processed and arranged with high precision, a strong load may be concentrated on some bolts and the joining strength may be reduced.

  Further, in the configuration disclosed in Patent Document 2 described above, the joint surface between the sole portion and the head body is not a single plane (joining of the concave portions). And unusual noise (chattering noise) are likely to occur, and the bonding strength is also unstable only by bonding with a plurality of screws.

  As disclosed in Patent Documents 1 and 2 described above, in the conventional head, the sole portion (sole member) is connected to the head body so that the weight of the sole portion can be easily adjusted during the manufacturing process. This is merely a configuration in which a separate body is formed, and this is joined to the head body by a fastening member. This is a head structure (one golf club) as a single unit when it is marketed as a golf club, and cannot be replaced by attaching and detaching a sole portion according to each user's preference after purchase by a user. .

  The hollow golf club head to which the present invention is applied is mounted on a so-called fairway wood, a golf club called a utility, and mainly hits a ball on grass (including rough) on a fairway. Therefore, when swinging and hitting the ball, the head moves while the sole portion touches the turf. In this case, the state of the turf under the ball differs greatly depending on the type of turf (eg, western turf, koso turf, wild turf, bermuda turf, etc.) and season (summer turf, winter dead turf, etc.) of the golf course. For this reason, in the head structure as a single body as in a conventional golf club, it is not always possible to hit a ball in an optimum state in various situations. That is, there is no technical idea in conventional golf clubs called fairway woods and utilities to change to an optimum sole portion desired by the user according to the place and season.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and has as its object to provide a hollow golf club head capable of detachably changing a sole portion according to a user's preference. In addition, the present invention provides a hollow golf club head having such a hollow golf club head that the sole member to be detached has a high bonding strength and does not generate abnormal noise when hitting a ball. It is an object of the present invention to provide a sole member which can be easily mounted and can be mounted with high accuracy.

In order to achieve the above object, a golf club head according to the present invention has a face portion having a face surface, a crown portion extending rearward from an upper edge of the face portion, and a rearward portion extending from a lower edge of the face portion. A specific gravity higher than the constituent material of the head main body with respect to the sole part of the head main body having a sole part extending, a back part facing the face part, and a side part passing from the face part through the back part. A metal golf club head having a hollow structure in which the sole member is detachable by a plurality of fastening members. The sole portion of the head body is depressed in a substantially triangular shape with the face side open, and the surface thereof is the with a flat processed head side flat surface, said sole member, the substantially a head-side flat surface having the same shape recessed in a triangular shape, when attached to the sole portion, the substantially three Recessed shape provided with a sole-side flat surface interview head side flat surface, to the head-side flat surface and the sole-side flat surface, joining points for mounting the sole member to the sole portion by at least the plurality of fastening members The sole portion of the head body is provided with a buffering structure so that an impact acting on the face portion at the time of hitting the ball is not directly transmitted to the sole member mounted on the sole portion. The structure is provided with a groove extending in the toe-heel direction of the sole portion by folding back the surface on the sole side of the face portion, and the folded portion is formed to be thinner than the center thickness of the face portion. And

  ADVANTAGE OF THE INVENTION According to this invention, the hollow golf club head from which a sole part can be attached or detached according to a user's preference can be obtained. Further, in such a hollow golf club head, a structure is obtained in which the joining strength of the detachable sole member is high, and no abnormal noise is generated at the time of hitting, and the sole member can be easily attached to and detached from the head body. It becomes possible to mount it with high accuracy.

FIG. 1 is a plan view showing a first embodiment of a hollow golf club head according to the present invention. The figure which looked at the hollow golf club head shown in FIG. 1 from the heel side. The figure which looked at the hollow golf club head shown in FIG. 1 from the toe side. The figure which looked at the hollow golf club head shown in FIG. 1 from the sole side. FIG. 2 is a sectional view taken along the line AA in FIG. 1. Sectional drawing along the BB line of FIG. Sectional drawing along CC line of FIG. 2 in the state which removed the sole member. FIG. 3 is an exploded perspective view showing a state where a sole member is removed from a head main body. It is a figure which shows a sole member, (a) is a top view, (b) is a perspective view, (c) is a side view, (d) is a back view, (e) is a front view. FIG. 5 is a plan view showing a second embodiment of the hollow golf club head according to the present invention. The figure which looked at the hollow golf club head shown in FIG. 10 from the toe side. The figure which looked at the hollow golf club head shown in FIG. 10 from the sole side. Sectional drawing along the DD line of FIG. Sectional drawing along the FF line of FIG. FIG. 12 is a sectional view taken along the line EE of FIG. 11 with the sole member removed. The perspective view of a sole member. FIG. 3 is an exploded perspective view showing a state where a sole member is removed from a head main body. FIG. 6 is an exploded perspective view showing a third embodiment of the hollow golf club head according to the present invention, and showing a state where a sole member is removed from a head main body. FIG. 14 is an exploded perspective view showing a fourth embodiment of the hollow golf club head according to the present invention, in which a sole member is removed from a head main body. FIG. 11 is a cross-sectional view of a hollow golf club head according to a fifth embodiment of the present invention, taken along a face-back direction of the hollow golf club head. FIG. 13 is an exploded perspective view showing a state in which a sole member is removed from a head body, according to a sixth embodiment of the hollow golf club head according to the present invention. (A)-(c) is a figure showing the example of composition of the sole member attached to a head main part, respectively.

Hereinafter, embodiments of a hollow golf club head and a sole member according to the present invention will be described.
1 to 9 are views showing a first embodiment of a hollow golf club head and a sole member according to the present invention. In the hollow golf club head of the present invention (hereinafter, referred to as a head), a sole member serving as a sole portion is detachable, and as described above, in the present invention, the sole member is removed from the head. The thing is defined as "head body". As is generally known, the head body has a structure in which a plurality of outer shells formed by casting, forging, or the like are integrated by welding, bonding, or the like. A plurality of types of sole members are prepared for the structure (head body) according to the user's preference, and each sole member is configured to be detachable from the head body.

  The head 1 of the present embodiment includes a face portion 2 having a ball striking face (face surface) 2a, a crown portion 3 extending rearward from an upper edge of the face portion 2, and a crown portion 3 extending rearward from a lower edge of the face portion 2. A sole portion 5, a back portion 6 facing the face portion 2, a toe portion 7 and a heel portion 8 passing from the face portion 2 through the back portion 6. In addition, since the back part 6, the toe part 7, and the heel part 8 connect the edge part of the said crown part 3 and the sole part 5, these are also called side parts. Further, since the sole portion 5 has a structure in which the area is detachable as described above, the detachable portion is referred to as the sole member 10 and the remaining portion is referred to as the sole portion (sole side) 5. . That is, the sole member 10 is attached to and detached from the head main body 1A including the face portion 2, the crown portion 3, the sole portion 5, the back portion 6, the toe portion 7, and the heel portion 8.

  The head body 1A is configured by joining a plurality of outer shell members divided at various positions by welding, bonding, or the like. Each outer shell member can be integrally formed by, for example, casting and press-molding a titanium alloy, an aluminum-based alloy, a magnesium alloy, or the like, and the head body 1A is formed by welding the respective edge regions. You. In this case, the outer shell member forming the head main body 1A is formed by casting a plurality of members or a partial component of each member such as integrating the side portion and the sole portion or integrating the crown portion and the side portion. Alternatively, they may be integrally formed and fixed by welding, bonding, or the like. For this reason, the boundary of each part does not necessarily need to be clearly divided by the ridge line, and the back part 6, the toe part 7, and the heel part 8 connect the crown part 3 and the sole part 5 continuously without a boundary. Such a curved surface may be used.

  The face portion 2 is integrally formed by, for example, pressing, NC processing (including CNC processing), or forging titanium, a titanium alloy, or the like. It is possible to join to other outer shell members by welding, brazing, bonding or the like. The face portion 2 of the present embodiment is formed in a cup shape, and is joined to openings formed at the front ends of the crown portion 3, the sole portion 5, and the side portions (toe portion 7 and heel portion 8). It is configured. For this reason, the face part 2 of the present embodiment constitutes a part of the crown part, the side part, and the sole part. Of course, regarding the face portion 2, the striking surface 2a is formed in a plate shape, and this is fixed to an opening formed in the face portion, or the face member formed in the plate shape is replaced with a crown portion, It may be configured to be joined to the front end opening of the sole portion and the side portion. As for the material of the head body, in the case of a head having a small capacity, a stainless steel alloy may be used including the face member.

  The head 1 is integrally formed with a hosel portion 9 for fixing a tip of a shaft (not shown). The hosel portion 9 is provided so as to protrude upward from the face / heel side of the crown portion 3, and a golf club is formed by fitting and fastening a tip end portion of a shaft to the opening hole 9 a. .

  As described above, the detachable sole member 10 is attached to the sole portion 5 of the head 1. In this case, it is preferable that the face-side edge 10a of the sole member 10 to be mounted is separated from the head body 1A, that is, the front edge 10a of the sole member 10 is open. Specifically, as shown in FIG. 5, it is sufficient that the edge 10a does not contact any of the head main bodies 1A. In the present embodiment, the surface of the sole portion 5 is moved in the toe-heel direction. This is folded back on the face part side, and a groove 5a is formed in this part along the toe-heel direction so as to be added to the sole member 10 and to be separated from the front edge of the sole part 5.

  By forming the groove 5a as described above in the sole portion 5, it is possible to reduce the impact acting on the face portion at the time of hitting the ball, so that the impact is not transmitted directly to the sole member 10. That is, the groove 5a extending in the toe-heel direction has a shock-absorbing structure at the time of hitting the ball, and by providing such a buffering structure, the shock is prevented from being directly transmitted to the mounted sole member 10, The sole member 10 can be hardly detached from the head main body 1.

  Although the cushioning structure of the present embodiment is formed in a groove shape by folding the surface of the face portion 2 on the sole side, it is sufficient that the front of the front end of the sole member 10 is in an open state. Is also good. Further, as described above, if the edge 10a of the sole member 10 is separated from the head body 1A (if the face side of the edge 10a is open), the sole member 10 formed to project forward. Can be mounted (in FIG. 5, a sole member whose edge 10a is shifted to the area of the groove 5a is mounted). In this case, it is possible to shift the position of the center of gravity forward as a head.

  The shock absorbing effect of the groove 5a constituting the buffer structure differs depending on the thickness. Actually, it is preferable that the thickness of the portion where the face portion 2 is folded back on the back surface side of the face surface 2a (return portion 2b; see FIG. 5) is smaller than the center thickness of the face portion. It is preferable to set the range of 6 to 2.4 mm, and it is particularly preferable to set the range to 0.9 to 1.5 mm.

  In addition, the buffer structure is formed not only in the above-described groove in the sole portion but also in at least one or more of the crown portion 3, the sole portion 5, and the side portions (toe portion 7 and heel portion 8). You can keep it. In the present embodiment, grooves 3a, 5a, 7a, and 8a are formed in the respective portions, respectively, and have a one-round structure together with the grooves 5a formed in the sole portion 5. By forming a groove having a buffering action over the entire circumference on the face side of the head in this way, it is possible to more effectively transmit the ball impact to the rear even with variations in hit points at the time of hitting. Thus, the impact on the sole member 10 can be reduced. The depth and width of the groove in each part and the thickness of the head in that part are appropriately set in consideration of the shock buffering effect.

As described above, the sole member 10 which is a separate member from the head body is detachably attached to the sole portion (sole side) 5 of the head body 1A by the fastening member 30.
Hereinafter, a specific configuration of the sole member and a detachable structure between the sole member and the head body will be described.

  As the sole member 10, in order to reduce the center of gravity of the head, it is preferable to use a material that is relatively heavier than the constituent material of the head body. Specifically, the weight of the sole member 10 and the fastening member 30 is preferably configured to be 30 to 120% of the total weight of the head (as an example, the sole member is made of a stainless steel material of 95 g, The head body is made of 110 g of titanium alloy, and the fastening member 30 is made of 2.5 g each). Alternatively, as the sole member 10, a material having a specific gravity larger than the constituent material of the head main body (for example, stainless steel, copper alloy, tungsten alloy, or the like, having a specific gravity difference of 1: 1.5 or more as compared with the constituent material of the head main body) Is preferably used.

However, if the sole member has a detachable structure and the weight of the sole member 10 is increased, the inertia force of the sole member increases, and the sole member comes off due to an impact at the time of hitting the ball, and abnormal noise (chattering sound) easily generated by the detachable structure. It gets bigger. In addition, when the specific gravity of the sole member is increased, the sole member becomes smaller with respect to the inertia force of the sole member, whereby the relative fastening area also becomes smaller. Is likely to be large.
In the present invention (the present embodiment), the sole member and the detachable structure of the sole member with respect to the head main body are made as follows, so that the sole member is hardly detached from the head main body, and abnormal noise is generated at the time of hitting a ball. That is being suppressed.

  The mounting structure of the sole member 10 and the sole portion 5 of the head main body 1A to which the sole member 10 is mounted has flat surfaces that are in contact with each other, and this flat surface is at least a bonding point for bonding both members. What is necessary is just to be provided in P.

  In the present embodiment, the flat surface on the head main body side (the flat surface on the head side) is, as shown in FIG. 8, the exposed surface of the sole portion 5 (the back surface on the sole side of the head main body) with the face side opened. The head-side flat surface 5A is formed by forming a substantially triangular depression and flattening the surface. For this reason, the periphery of the head side flat surface 5A is a rotation regulating wall 5B which faces (may be in contact with) the outer edge of the sole member 10. The sole member 10 is formed in a substantially triangular shape so as to have the same shape as the recessed head-side flat surface 5A, and the surface is flattened (NC processing as described later). A sole-side flat surface 10A is formed (see FIG. 9).

  Thus, when the sole member 10 is mounted on the head main body 1A, the respective flat surfaces 10A and 5A come into surface contact, and the two are joined by tightening the fastening member 30 at a joining point provided in the flat region. In this case, since the rotation of the outer edge of the sole member 10 is regulated by the rotation regulating wall 5B, even if a load in the rotational direction acts on the sole member 10, the load acts on the fastening member 30. Never. That is, the joining strength of the face member can be improved, and no load acts on the fastening member 30, so that it is possible to suppress the generation of abnormal noise.

  In addition, by forming the sole member in a substantially triangular shape, the manufacture of the sole member becomes easy, and the function as the sole of the head also becomes a preferable configuration. Further, the outer edges of the rotation restricting wall 5B and the sole member 10 are formed with high precision, and when the sole member 10 is mounted on the flat surface of the recessed portion of the sole portion 5, the outer edges of the rotation restricting wall 5B and the sole member 10 adhere to each other. In a state where the sole member 10 may be slightly separated, the sole member 10 can be positioned (the rotation restricting wall 5B and the outer edge of the sole member 10 constitute a positioning means). The positioning means by the circular opening 5C and the circular projection 10C which are in a fitting relationship can be omitted.

  Further, the sole member 10 having an optimum structure preferred by the user is selected and mounted on the head main body 1A according to the type of grass and the season of the golf course. The sole member 10 according to the present embodiment has a structure including four protrusions 10b provided on the ground contact surface (back surface 10B) side so as to extend in the face-back direction. As shown in FIG. 2, by forming such a protrusion 10b so as to protrude downward from the back surface 10B of the sole member, it is possible to reduce the center of gravity of the head. Further, since the protrusion 10b provided in the vicinity extends in the face-back direction, it is possible to reduce the resistance to the turf when hitting a ball.

The head body 1 </ b> A and the sole member 10 as described above are provided with positioning means for positioning the two in close contact with each other in the opposing regions.
This positioning means makes it easy to issue a proof of each sole member to the head main body when mounting each sole member to the head main body even if there are a large number of sole members to be exchanged for one head main body 1A. (It is only necessary to make the positioning easier.) By providing such a positioning means, the operation of attaching and detaching the sole member to and from the head main body can be easily and accurately performed. That is, the positioning means is configured such that the two members are in close contact with each other such that the components of the head body 1A and the components of the sole member 10 are fitted to each other separately from the fastening member for fixing the head body and the sole member. It is good if there is a function that can

Hereinafter, the configuration of the positioning means of the present embodiment will be described.
The positioning means 50 of the present embodiment is provided in a central region between the sole portion 5 and the sole member 10 of the head main body, and the joining point P is disposed radially outward of the positioning means 50. The positioning means 50 is composed of a protrusion 10C formed on the sole member 10 and a receiving portion 5C formed on the sole 5 of the head body 1A. Positioning can be performed in the state where it is done. Further, it is preferable that the projection 10C and the receiving portion 5C are formed so as to be perpendicular to the sole-side flat surface 10A and the head-side flat surface 5A.

  Specifically, the protrusion 10C is configured as a cylindrical body having a circular cross section that is perpendicular to the sole-side flat surface 10A, and the receiving portion 5C is formed as a circular opening so that such a cylindrical body having a circular cross section can be fitted. (Hereinafter, referred to as a circular projection 10C and a circular opening 5C). In this way, by forming the protrusions into a hollow cylindrical body, the weight of the positioning means can be reduced, and the weight can be easily adjusted. Further, by providing the receiving portion on the head main body side and forming a circular opening, a heavy object or the like can be attached to the internal space of the head main body 1A, and weight adjustment can be easily performed.

  In this embodiment, the circular opening 5C is formed in the area of the head-side flat surface 5A (see FIG. 8), and the circular protrusion 10C is formed by depressing the central region more than the sole-side flat surface 10A. (See FIGS. 5, 6 and 9). That is, the circular projection 10C is preferably formed so as to be depressed from the sole-side flat surface 10A, and its bottom is formed in a stepped structure (bottoms 10d, 10d) in consideration of the balance of the thickness, the position of the center of gravity, and the like. ´). The reason why the bottom is recessed from the sole-side flat surface 10A in this manner is that this position is located in the upper part of the center of the sole, so that it is not expected to contribute to lowering the center of gravity or horizontal (toe-heel direction) inertia. Therefore, it is better to leave this part as a space and provide the weight of the part in another part.

  It is preferable that the diameter of the circular opening 5C and the circular protrusion 10C is formed in the range of 25 to 42 mm. Here, the reason why the diameter is set to the above-mentioned range is to facilitate the assembling work of both members, and in particular, by setting the diameter to 25 mm or more, a finger can be inserted into the circular opening 5C, and the circular opening 5C can be inserted. By inserting a finger into the head main body 1A through the interface, it is possible to easily perform a heavy work such as a sticking work or a dust removing work at the time of assembly.

  If the diameter is too large, the contact area between the sole member 10 and the flat surfaces of the head main body 1A and the portion for receiving the fastening member 30 become relatively small, and the degree of freedom in design becomes poor. Is preferably set to 42 mm or less. That is, by setting the diameter to 42 mm or less, a sufficient contact area between the flat surfaces can be ensured, and a large portion for forming a screw hole 5f described later can be ensured. The positional relationship with the screw hole 5f is less likely to change, and it is possible to prevent load concentration on the screw portion.

  The joining point P for fixing the sole member 10 to the head main body 1A is provided at a part that becomes a flat surface of the sole member 10 and the head main body 1A apart from the above-described positioning means. A fastening member (stop screw) 30 for fixing both members is screwed into the joining point P, and an opening 10f is formed in the sole member 10 so that the fastening member 30 can be inserted. I have. As shown in FIG. 8, the fastening member 30 includes a head 30a, and is configured to insert a jig (a dedicated jig or a general driver) into this portion to perform a fixing operation. Therefore, the opening 10f has a stepped shape so that the head is not exposed from the back surface 10B of the sole member (see FIG. 5). When screwing the fastening member 30, the O-ring 31 is interposed to prevent loosening. As described above, the detachable structure using the stop screw facilitates the detachment operation of the sole member.

  When the sole member 10 is positioned, a screw hole 5f is formed at a position corresponding to the opening 10f on the head side flat surface 5A of the head main body 1A. That is, when the circular projection 10C of the sole member 10 is fitted into the circular opening 5C, the opening 10f on the sole member side and the screw hole 5f on the head main body side are formed so as to coincide with each other. P).

  The joining point P in the present embodiment is installed radially outward with respect to the positioning means 50, and is configured so that the sole member can be stably joined. In this case, by setting the joining points P at three places and disposing the respective joining points at the same distance from the center of the positioning means 50, the load at each joining point acts in a well-balanced manner, and Thus, even if a gap is generated, it can be absorbed in a well-balanced manner. In particular, in the present embodiment, three joining points are arranged at substantially equal intervals in the circumferential direction (two places on the toe side and the heel side on the face side and one place on the center position on the back side). The sole member 10 can be fixed with good balance.

  It is preferable that an elastically deformable O-ring 35 such as rubber is interposed at a portion where the head body 1A and the sole member 10 come into contact with each other radially outward of the circular protrusion 10C. In other words, the portions where the positioning means are provided are in close contact with each other, and moisture or dust or the like may enter the head main body from this portion or may cause abnormal noise. preferable. Specifically, in the present embodiment, a circumferential groove 10h is formed around the circular projection 10C of the sole member 10, and the O-ring 35 is fitted into this portion.

The O-ring 35 as described above preferably has a diameter of about 1.5 to 3.6 mm, and is interposed between the sole-side flat surface 10A and the head-side flat surface 5A as in the present embodiment. By doing so, it is possible to obtain a waterproof effect, suppress variations in shot feeling, and improve shot feel.
The O-ring 35 may be disposed in a region where the head main body 1A and the sole member 10 are in contact with each other. For example, by mounting the O-ring 35 on the outer peripheral surface of the circular projection 10C, the waterproof function for the inside of the head main body is further enhanced. It becomes possible.

Further, the sole member 10 may be configured as a flat surface other than the region of the positioning means 50, but it is preferable to form the concave groove 10m in an appropriate position on the flat surface as in the present embodiment. For example, the concave groove 10m can be formed intermittently along the circumferential direction around the circular protrusion 10C (see FIG. 9), can be formed continuously, or can be formed in a dotted manner. .
By forming such a concave groove, a resin, a metal, or the like can be provided inside the concave groove, and the adjustment of the weight balance and the position of the center of gravity can be easily performed. Further, such a concave groove may be formed on the head side flat surface 5A of the head main body 1A.

  Furthermore, in addition to the four protrusions 10b as described above, the back surface 10B of the sole member 10 is formed by cutting the surface to form a concave flat surface 10n to reduce the contact area with the ground. Modifications can be made as appropriate according to the mode.

  The head main body 1A is formed with a protruding wall 5g that protrudes into the internal space of the head main body along the edge of the circular opening 5C and is in contact with the outer surface of the circular protruding portion 10C (see FIG. 7). The circular projection 10C is brought into surface contact in a long range along the axial direction. By forming the protruding wall 5g in this manner, the perpendicularity of the contact surface of the circular protruding portion 10C to the flat surfaces 5A, 10A becomes more stable, so that the strength in the close contact area can be improved and the generation of abnormal noise can be reduced. Can be prevented.

  A rib 5h is formed on the inner surface 5D of the sole portion 5 of the head main body 1A on the head main body side so as to extend from the circular opening of the head main body toward the side wall. It is preferable that a plurality of ribs 5h have a height of about 1.0 to 3.0 mm and a plurality of the ribs 5h are formed. By forming such ribs, deformation of the head side flat surface 5A is prevented. Becomes possible. In particular, by integrating such a rib 5h with the protruding wall 5g and disposing the screw hole 5f of the fastening member 30 on the rib, the positional relationship between the circular opening 5C and the screw hole 5f is provided. Is less likely to change, and concentration of the load acting on the screw hole from the fastening member 30 is prevented, thereby preventing generation of abnormal noise.

  The above-described sole member 10 and the sole portion 5 of the head main body 1A are preferably formed by NC (CNC) processing, and the sole side flat surface 10A of the sole member 10 and the head main body side flat surface of the head main body 1A are preferably formed. By performing NC processing on 5A, the close contact state (positioning) of both can be obtained with high accuracy. In particular, regarding the sole member 10, in addition to the flat surface 10 </ b> A, the circular projection 10 </ b> C and the screw hole 10 f, and further, the NC processing is performed on the contour thereof (preferably, the NC processing is performed once in a state of being fixed to a jig). Accordingly, the accuracy of the sole member can be improved, for example, the verticality of the circular protrusion 10C with respect to the flat surface 10A can be accurately obtained, and the same processing can be performed on a plurality of prepared sole members. Thus, all the sole members can be manufactured with the same accuracy.

  In addition, since the positioning means 50 with the circular projection 10C and the circular opening 5C is provided on the head body 1A and the sole member 10 formed with high precision as described above, when the sole member 10 is mounted on the head body 1A, The fitting accuracy between the two is increased, and accurate positioning can be performed. Then, in a state where both are positioned, the head-side flat surface 5A and the sole-side flat surface 10A are in surface contact with each other, and a fastening member 30 (joining point P) for fastening the both is provided in this portion. Therefore, the joining strength is increased, and a large load can be prevented from being applied to each of the fastening members 30. As a result, when an impact at the time of hitting is applied to the face portion, no rattling or abnormal noise (chattering) is generated in the region of the fastening member, and the two members are brought into close contact by the positioning means (fitting). Also stabilizes the bonding strength.

Next, another embodiment of the present invention will be described.
In the embodiments described below, the same components as those in the above-described embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

10 to 17 are views showing a second embodiment of the hollow golf club head according to the present invention.
In the present embodiment, grooves 3a and 5a are formed in the crown portion 3 and the sole portion 5 of the head to reduce the impact, and no grooves are formed in the side portions. Thus, even if the groove portions are formed in the crown portion and the sole portion, a sufficient cushioning action can be obtained, and the sole member 110 can be hardly detached from the head main body 1A. Also, a plurality of protrusions extending in the face-back direction as in the first embodiment are not formed on the back surface 110B of the sole member 110, and recesses 110a and 110b are formed on the toe side region and the heel side region, respectively. are doing. That is, by forming a concave portion on each of the toe side and the heel side of the back surface of the face member, the ground contact area is reduced and the sole resistance between the turf and the turf is reduced.

  In this embodiment, as shown in FIGS. 13 and 15, each rib 5h 'formed on the inner surface 5D of the sole portion 5 of the head main body 1A on the head main body side is not connected to the side wall, and the screw hole 5f is formed. End. By doing so, even if an impact acts on the side wall at the time of hitting by not forming a groove in the side wall as described above, the impact is not transmitted to the screw hole 5f or the circular opening 5C. (The generation of abnormal noise can be prevented).

  Further, in the present embodiment, the rotation restricting wall 5B as shown in FIG. 8 is not formed, and the sole portion 5 of the head main body is formed so as to be entirely flat. That is, a wider contact surface between the flat surface of the head body and the flat surface of the sole member is ensured so that a stable joint state can be obtained. In this case, since the sole member 110 receives a force in the rotation direction by the positioning means 50 formed by the circular projection 10C and the circular opening 5C, it is preferable to separately provide a rotation restricting means for the sole member 110.

Specifically, for example, the rotation restricting boss 120 may be fitted to the face side of the positioning unit 50. That is, a boss hole 121 for receiving one end of the boss 120 is formed in the sole portion 5 of the head main body 1A, and a boss hole 122 for receiving the other end of the boss 120 is formed at a corresponding position on the sole member 110 side. In addition, when the sole member 110 is mounted on the head main body, a boss 120 serving as a rotation restricting member may be fitted into each of the boss holes 121 and 122 to fix them (see FIGS. 13 and 17).
Even in such a configuration, when the sole member 110 receives a force in the rotational direction, the load does not act on the fastening member 30, so that the joining strength can be improved and the generation of abnormal noise can be prevented. it can.

  In the case where the boss 120 for rotation control as described above is used, the boss hole 121 on the head main body side has a rib 5h ″ formed on the inner surface 5D on the head main body side as shown in FIG. Preferably, it is arranged on the rib. Thus, even if a large rotational load is applied to the boss 120, it is possible to improve the bonding strength.

FIG. 18 shows a third embodiment of the hollow golf club head according to the present invention, and is an exploded perspective view showing a state where the sole member is removed from the head main body.
The positioning means 50 in the above-described embodiment forms a cylindrical body (circular projection 10C) having a circular cross section in the central region of the sole members 10 and 110, and the circular part which receives the cylindrical body on the sole part of the head main body. Although the opening 5C is formed, the cross-sectional shape of the cylindrical body forming the positioning means 50 is not limited to a circle, and can be variously deformed.

  Specifically, in the present embodiment, as shown in FIG. 18, a tubular body (frame body) 210 </ b> C having a square (regular polygon) cross section is formed on the sole member 210, and the sole portion 5 of the head main body 1 </ b> A is formed. A square opening 205C into which such a cylindrical body 210C is fitted is formed on the flat surface 5A of the above-mentioned flat surface 5A so that the two are in close contact with each other.

According to such positioning means, since the rotation of the sole member 210 around the positioning means is restricted, as shown in FIG. 8, a rotation restricting wall 5B is formed on the sole part 5 of the head main body. As shown in FIG. 17, there is no need to provide a boss 120 for rotation control, and the configuration can be simplified.
In addition, it is preferable that such a protrusion (cylindrical body) is formed in a regular polygonal cross section. However, it is not always necessary to form the regular polygon, and an arbitrary polygonal shape may be used unless the difference between the long and short sides is large. There may be. Alternatively, it may be configured to have an elliptical cross section. The back surface structure (ground structure) is configured as shown in FIG.

FIG. 19 shows a hollow golf club head according to a fourth embodiment of the present invention, and is an exploded perspective view showing a state where a sole member is removed from a head main body.
In the above-described embodiment, the positioning means 50 forms the protrusions (the circular protrusion 5C, the rectangular protrusion 210C) on the sole member side, and the receiving portions (the circular opening 10C, the rectangular opening 205C) on the head body side. Although formed, the protrusion and the receiving portion may be reversed. That is, a protrusion (a cylindrical body 5F having a circular cross section) may be formed on the sole portion side of the head main body 1A, and a receiving portion (a circular opening 310F) may be formed on the sole member 310 side.
Even with such a configuration, the same operation and effect as those of the above-described embodiment can be obtained.

FIG. 20 shows a fifth embodiment of the hollow golf club head according to the present invention, and is a cross-sectional view of the hollow golf club head along the face-back direction.
In the positioning means 50 in the above-described embodiment, the protrusion and the receiving portion are formed integrally with the head body and the sole member, respectively, but the member that performs the fitting between them is constituted by a separate member from the head body and the sole member. May be.

  For example, as shown in FIG. 20, an annular recess 10 </ b> F is formed in the sole member 10, and a metal annular body 70 is fitted (or may be bonded) to this portion, and A configuration may be employed in which the sole member 10 and the head main body 1A are positioned in close contact with the body 70 and the circular opening 5C. That is, according to such a configuration, it is possible to select an optimum material in consideration of the constituent materials of the sole member 10 and the head main body 1A.

FIG. 21 shows a sixth embodiment of the hollow golf club head according to the present invention, and is an exploded perspective view showing a state where the sole member is removed from the head main body.
In this embodiment, a plurality of (three) positioning means for tightly engaging the head body 1A and the sole member 410 are formed. That is, the positioning means 50 has a plurality of projections (solid projections having a circular cross section) 5H formed on the sole portion side of the head main body 1A, and such projections 5H are tightly engaged with the sole member 410 side. A plurality of fitting holes 410C are formed. The joining point P where the fastening member for joining the head body and the sole member is arranged is arranged between the three positioning means 50 (substantially equidistant along the circumferential direction). Even if a load acts on 410, the load is not concentrated on one joint point.

  As described above, a plurality of positioning means can be formed, and the configuration in which the sole member is brought into close contact engagement with the head main body can be appropriately modified. For example, in addition to the above-described configuration, it is also possible to form close contact engagement between the concave and convex surfaces, or to combine close contact engagement between the concave and convex surfaces and close contact engagement between the protrusion and the receiving portion as described above. good.

FIGS. 22A to 22C are diagrams illustrating configuration examples of a sole member attached to the head main body 1A.
As described above, the present invention is characterized in that a sole member having a different structure can be attached to and detached from one head body 1A depending on the situation. For example, the sole member 10 (FIG. 22 (b)) shown in the first embodiment, the sole member 110 (FIG. 22 (a)) shown in the second embodiment, and a plurality of curved surfaces (formed on the toe side). Sole member 210 (FIG. 22 (c)) having a reduced contact area by forming a curved surface 210a, a curved surface 210b formed on the heel side, and an inclined surface (inclined surface 210c gradually rising toward the back side). ), Etc., a large number of sole members are prepared for the head main body, so that the user can select and mount an optimal sole member according to the season, place, turf status, and the like.

  And, as described above, even if a large number of sole members are prepared, each sole member can be accurately positioned with the head main body by the close contact means. Even if it is attached, generation of abnormal noise can be effectively prevented.

1 head (hollow golf club head)
1A Head body 2 Face part 3 Crown part 5 Sole part 5A Head side flat surface 10, 110, 210, 310, 410 Sole member 10A Sole side flat surface 30 Fastening member 50 Positioning means P Joining point

Claims (2)

A face portion having a face surface, a crown portion extending rearward from an upper edge of the face portion, a sole portion extending rearward from a lower edge of the face portion, a back portion facing the face portion, and a face portion A metal part having a hollow structure in which a sole member having a higher specific gravity than the constituent material of the head body can be detachably attached to the sole part of the head body having a side part passing through a back part by a plurality of fastening members. Golf club head,
The sole portion of the head main body is provided with a head-side flat surface obtained by flattening the surface by depressing in a substantially triangular shape with the face side opened .
The sole member has the same shape as the head-side flat surface depressed in the substantially triangular shape, and when attached to the sole portion, the sole-side flat surface in contact with the head-side flat surface depressed in the substantially triangular shape. Equipped,
The head-side flat surface and the sole-side flat surface are provided with joining points for attaching a sole member to the sole portion by at least the plurality of fastening members,
The sole portion of the head body is provided with a buffering structure so that an impact acting on the face portion at the time of hitting the ball is not directly transmitted to the sole member mounted on the sole portion,
The buffer structure has a groove extending in the toe-heel direction of the sole by folding back the sole-side surface of the face, and the folded-back portion is formed to be thinner than the center thickness of the face. A golf club head characterized by the following.   The golf club head according to claim 1, wherein the buffer structure has a groove provided in at least one of the crown portion and the side portion.