JP2007312846A - Golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To firmly fix a weight member to a head main body with a good productivity. <P>SOLUTION: This golf club head includes a head main body made of a metal material, and the weight member 9 which is fixed to the head main body and has a larger specific gravity than that of the head main body. The head main body is provided with a recess section 11 for fixing the weight member 9. The recess section 11 includes an opening recess section 12 which opens to the head external surface side and has a bottom section 15, and a threaded hole section 13 which has a smaller cross sectional area than that of the bottom section 15, extends to the head internal side from the bottom section 15, and has a thread groove in the inner peripheral surface. The weight member 9 is made of the metal material of which the specific gravity is 8.0 to 19.0, and also, includes a threaded shaft section 9b which is screwed with the threaded hole section 13, and a head section 9a which is arranged in the opening recess section 12 by having a larger cross sectional area than that of the threaded shaft section 9b. A washer member 10 is pinched between the head section 9a and the bottom section 15 of the opening recess section 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a golf club head capable of firmly fixing a weight member to a head body with good productivity.

  Conventionally, in order to provide the center of gravity of a golf club head at an optimal position, various techniques for fixing a weight member having a specific gravity larger than that of the head body to the head body have been proposed (see Patent Document 1 below).

  As a method for fixing the weight member to the head body, an adhesive, welding, screw connection, or the like is known. However, in the method using an adhesive, there is a tendency that sufficient bonding strength cannot be obtained with respect to impact force at the time of hitting. In addition, in the case of welding, the combination of the weight member and the head main body is limited, and problems such as deterioration in productivity and increase in manufacturing cost are caused.

  In addition, when a screw shaft part is formed on the weight member and a screw connection is used to screw this into a screw hole provided in the head body, good productivity can be obtained, but the head body produced at the time of hitting the ball Is easily transmitted directly to the weight member, and as a result, looseness of the screw connection is likely to occur, resulting in insufficient joint strength.

  Further, a method of sandwiching the weight member between the head main body and the screw member by forming the weight member in an annular shape and screwing it to the head main body through a screw member separately prepared in the center hole is also considered. It is done. However, this method tends to cause a gap between the weight member and the head body. Such a gap causes the weight member having a large specific gravity to vibrate every time an impact is applied to the ball, and this tends to cause a decrease in bonding strength due to looseness of the screw shaft portion.

JP 2005-287679 A

  The present invention has been devised in view of the above circumstances, and the washer member is sandwiched between the head of the weight member having the screw shaft portion and the bottom of the opening recess provided in the head body. The main object of the present invention is to provide a golf club head capable of firmly fixing a weight member to a head body without impairing productivity.

  The invention according to claim 1 of the present invention is a golf club head in which a weight member having a specific gravity larger than that of the head body is fixed to a head body made of a metal material, and the weight member is attached to the head body. A concave portion for fixing is provided, the concave portion having an opening on the outer surface side of the head and having a bottom portion, a transverse area smaller than the bottom portion, extending from the bottom portion to the inner side of the head, and a thread groove on the inner peripheral surface. A screw shaft portion formed of a metal material having a specific gravity of 8.0 to 19.0 and screwed into the screw hole portion; and the screw shaft portion. A head portion that is formed on the outer surface side of the head and has a cross-sectional area larger than that of the screw shaft portion, and is disposed in the opening recess portion, and between the head portion and the bottom portion of the opening recess portion, The member is clamped And features.

  According to a second aspect of the present invention, the weight member is fixed to a sole base portion that forms the bottom surface of the head body, and the washer member is fitted in the opening recess and in the head front-rear direction rather than the toe-heel direction. 2. The golf club head according to claim 1, comprising a long oval plate body.

  According to a third aspect of the present invention, the washer member has a through-hole through which the screw shaft portion of the weight member passes on the back face side, and the face side protrudes laterally from the head. 3. The golf club head according to claim 1, further comprising a projecting portion visible from the head outer surface side, wherein the projecting portion includes a display portion such as a pattern provided with a mark and / or a pattern. .

  According to a fourth aspect of the present invention, the opening concave portion of the head main body extends from the bottom portion to the head outer surface side with substantially the same cross-sectional area and has a depth for accommodating the washer member, and the base portion. 4. The golf club head according to claim 1, further comprising a taper portion that is continuous with the taper and has a cross-sectional area that gradually increases toward the outer surface of the head.

  According to a fifth aspect of the present invention, the weight member is made of tungsten or a tungsten alloy, and the washer member is made of a resin, an aluminum alloy, or a stainless alloy, and has a specific gravity of 0.9 to 10. The golf club head according to any one of the above.

  In the golf club head of the present invention, a screw shaft portion is provided on a weight member having a large specific gravity, and the weight member is fixed to the head body by directly screwing the screw shaft portion into a screw hole provided in the head body. Is done. Therefore, productivity is good. A washer member is sandwiched and held between the head of the weight member and the bottom of the opening recess of the head body. Such a washer member can relieve vibrations of the head main body at the time of hitting the ball from being directly transmitted to the head of the weight member. As a result, loosening of the weight member can be suppressed over a long period of time.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a golf club head (hereinafter, simply referred to as “head” or “club head”) 1 of the present embodiment placed in a reference state, FIG. 2 is a bottom view thereof, and FIG. 1 is an XX cross-sectional view of FIG. 1, and FIG. 4 is an AA ′ cross-sectional view of FIG.

  The club head 1 includes a face portion 3 having a face 2 which is a surface for hitting a ball, a crown portion 4 which is continuous with the upper edge 2a of the face 2 and forms an upper surface of the head 2, and a head which is continuous with the lower edge 2b of the face 2. Between the sole portion 5 forming the bottom surface and the crown portion 4 and the sole portion 5, the toe side edge 2 c of the face 2 passes through the back face (surface facing away from the face 2) BF and reaches the heel side edge 2 d. The side part 6 which extends and the hosel part 7 which has the shaft insertion hole 7a provided in the heel side of the crown part 4 and in which a shaft (not shown) is inserted are provided.

  Further, as shown in FIG. 3, the club head 1 has a hollow structure in which a hollow portion i is provided, and is preferably formed as a wood type such as a driver (# 1) or a fairway wood.

  Further, the reference state of the club head 1 is a state in which the head 1 is grounded to the horizontal plane HP by tilting to a predetermined loft angle (“real loft angle”, the same shall apply hereinafter) and a lie angle. Unless otherwise specified in the present specification, the head 1 is described as being in this reference state.

The club head 1 is preferably 350 cm ³ or more, more preferably 380 cm ³ or more by volume. Such a large volume serves to increase the moment of inertia of the head 1 and to make the head center of gravity G deeper. On the other hand, it is too the volume of the club head 1 is large, the increase in head weight, because of a problem such as deterioration and golf rule violation swing balance, preferably 460 cm ³ or less.

  The total weight of the club head 1 can be arbitrarily determined, but is preferably 180 g or more and 210 g or less. If the total weight of the club head 1 is too small, the weight of the head becomes difficult to be felt during the swing, so that the timing is difficult to take and the resilience performance tends to be lowered. On the other hand, if the total weight of the head becomes too large, the club cannot be shaken and the flight distance and directionality of the hit ball tend to deteriorate.

  Further, as shown in FIGS. 3 and 4, the club head 1 of the present embodiment includes a head body 1A, a weight member 9 having a larger specific gravity than the head body 1A, the weight member 9 and the head body 1A. And a washer member 10 sandwiched between the two.

  The head main body 1A includes the face portion 3, the crown portion 4, the side portion 6, and the hosel portion 7, and also includes a sole base portion 5a that forms the bottom surface thereof. The metal material for forming the head main body 1A is not particularly limited. For example, stainless steel (specific gravity about 7.8), maraging steel, titanium, titanium alloy (specific gravity about 4.4), aluminum alloy (specific gravity about 2. 7) One or more metal materials such as a magnesium alloy (specific gravity about 1.8) or an amorphous alloy are desirable. These are formed by joining a plurality of parts obtained by, for example, forging, casting and / or pressing. However, a non-metallic material such as fiber reinforced resin may be bonded to the head main body 1A.

  Further, the specific gravity ρm of the material constituting the head main body 1A is not particularly limited. However, if the specific gravity ρm is too large, the head weight is significantly increased, or the head volume must be reduced to prevent this. From such a viewpoint, the specific gravity ρm is preferably 10.0 or less, more preferably 9.0 or less, still more preferably 8.0 or less, and most preferably 5.0 or less. The lower limit of the specific gravity ρm of the head body 1A is not particularly limited, but is preferably 1.0 or more, more preferably 2.0 or more, and further preferably 4.0 in order to ensure the basic strength of the club head. The above is desirable. When the head body 1A is made of two or more kinds of metal materials, the specific gravity ρm is an average specific gravity weighted by the volume ratio of each material.

  Further, a recess 11 for fixing the weight member 9 is provided in the sole base portion 5a of the head main body 1A, and the weight member 9 is fixed to the recess 11 via a washer member 10. As described above, the club head 1 in which the weight member 9 is fixed to the sole base portion 5a has a low center of gravity G of the head, and consequently a small sweet spot SS. Such a club head 1 makes it easier to hit the ball above the sweet spot SS. As a result, the longitudinal gear effect acts on the ball, the launch angle is large and the back spin rate is small. The ideal trajectory can be obtained.

  As shown in FIG. 4, the concave portion 11 includes an opening concave portion 12 that opens to the outer surface side of the head and has a bottom portion 15. The concave portion 11 extends from the bottom portion 15 to the inside of the head with a smaller cross-sectional area than the bottom portion 15. And a screw hole portion 13 in which a screw groove is formed.

  In the present embodiment, the bottom 15 of the opening recess 12 is a substantially flat surface. As understood from FIG. 2, the bottom portion 15 is non-circular when viewed from the bottom, and in this embodiment, is formed in an oval shape that is longer in the front-rear direction of the head than in the toe-heel direction. Further, the opening recess 12 includes a base portion 12b extending from the bottom portion 15 toward the outer surface of the head with substantially the same cross-sectional area, and a tapered portion 12a connected to the base portion 12b and gradually increasing in cross-sectional area toward the head outer surface side. Have. The “cross-sectional area” is a cross-sectional area cut by a plane parallel to the bottom 15. The screw hole 13 is formed perpendicular to the bottom 15. In order to form the screw hole 13, for example, a boss portion 17 is provided on the back side of the bottom portion 15 on the hollow portion i side.

  As shown in FIG. 5, the weight member 9 is formed on a screw shaft portion 9b to be screwed into the screw hole portion 13, and one end side (head outer surface side) of the screw shaft portion 9b. And a head portion 9a disposed in the opening recess 12 by having a larger cross-sectional area. In this embodiment, the head portion 9a has a disk shape provided coaxially with the screw shaft portion 9b, and a projection of a dedicated tool (not shown) is inserted into the outer side surface 9ao to tighten the weight member 9 Alternatively, a plurality (three in this example) of tool insertion holes 20 for loosening are provided.

  Moreover, the weight member 9 needs to be formed from a metal material having a specific gravity of 8.0 to 19.0. If the specific gravity ρw of the weight member 9 is smaller than 8.0, the head center of gravity G cannot be adjusted efficiently, for example, the weight member 9 must be considerably enlarged in order to obtain a required weight. In particular, the specific gravity ρw of the weight member 9 is more preferably 12.0 or more, and further preferably 13.0 or more. On the other hand, when the specific gravity ρw exceeds 19.0, there is a possibility that the material cost and the like increase and the productivity deteriorates. From such a viewpoint, the specific gravity ρw of the weight member 9 is more preferably 17.0 or less, and further preferably 15.0 or less. As the material of the weight member 9, tungsten or a tungsten alloy can be adopted, and a tungsten-nickel (W—Ni) alloy having a higher specific gravity is particularly preferable.

  The weight of the weight member 9 is not particularly limited, but if it is too small, the head center of gravity G may not be moved effectively even if the weight member 9 is attached to the head body 1A. On the other hand, if the weight member 9 is too heavy, the total weight of the head becomes large and it becomes difficult to swing, and the head body 1A may need to be lightened. From this point of view, the weight member 9 preferably has a weight of 3 g or more, more preferably 4 g or more, and even more preferably 5 g or more, and the upper limit is preferably 20 g or less, more preferably 18 g or less, even more preferably. Is preferably 15 g or less. The weight of the weight member 9 is desirably about 1.5 to 12.0% of the total weight of the head 1.

  In the club head 1 of the present embodiment, the washer member 10 is held between the head 9 a of the weight member 9 and the bottom portion 15 of the opening recess 12.

  The washer member 10 of the present embodiment is formed of a plate body having a substantially constant thickness t1, and is formed so as to be fitted to the base portion 12a of the opening recess 12. That is, the inner side surface 10 i facing the hollow portion i of the washer member 10 is formed by a surface parallel to the bottom portion 15 of the opening recess 12. Thereby, the inner surface 10 i of the washer member 10 can be in surface contact with the bottom 15 in a wide range when fitted into the opening recess 12. Further, the outer peripheral end face 10p of the washer member 10 is formed to have a contour slightly smaller than the inner peripheral face of the base portion 12a so as to be fitted into the base portion 12a. When such a washer member 10 is fitted into the opening recess 12 of the head main body 1A, movement relative to the head main body 1A is limited.

  Further, in the present embodiment, the maximum thickness t1 of the washer member 10 is formed substantially the same as the depth d1 of the base portion 12a. Thereby, the outer side surface 10o facing the head outer surface side of the washer member 10 is provided at a position reserved on the hollow portion i side with respect to the sole surface 5S. If the maximum thickness t1 of the washer member 10 is too small, the strength tends to be insufficient. On the other hand, if the maximum thickness t1 is too large, the total head weight may be increased. From such a viewpoint, the thickness t1 of the washer member 10 is preferably 0.5 mm or more, more preferably 1.0 mm or more, and most preferably 1.5 mm or more, and the upper limit is preferably 4. 0 mm or less, more preferably 3.0 mm or less is desirable.

  Further, a stepped opening 14 is provided on the back face side of the washer member 10 of the present embodiment so as to penetrate the washer member 10 in and out.

  The stepped opening 14 is formed, for example, in a through hole 14a having a cross-sectional area through which the screw shaft portion 9b of the weight member 9 is passed but not through the head 9a, and the head outer surface side of the through hole 14a. A head receiving hole 14b having a larger cross-sectional area than the hole 14a and capable of receiving the head 9a of the weight member 9 is provided coaxially. The head receiving hole 14b rotatably accommodates the head 9a of the weight member 9 therein, and the outer surface 9ao and 10o of the head 9a and the washer member 10 are substantially flush with each other. Its depth is defined.

  The stepped opening 14 is arranged substantially coaxially with the screw hole 13 by fitting the washer member 10 into the opening recess 12. Then, the screw shaft portion 9b of the weight member 9 is passed through the stepped opening portion 14 from the head outer surface side, and the screw shaft portion 9b is screwed into the screw hole portion 13 of the head main body 1A. Thus, the weight member 9 is fixed to the sole base 5a with the head portion 9b having a large outer diameter on the lower side, and the washer member 10 is interposed between the head portion 9a of the weight member 9 and the bottom portion 15 of the opening recess 12. The step 18 formed in the stepped opening 14 is clamped and clamped.

  At this time, since the opening recess 12 is provided with the taper portion 12a on the outer surface side of the head, the weight member 9 can be easily fitted into the base 12b of the opening recess 12 while being guided by the taper portion 12a. Therefore, productivity is improved. Further, since the taper portion 12a can increase the peripheral rigidity of the opening recess 12, the taper portion 12a is also useful for suppressing vibration of the sole portion 5 generated at the time of hitting, especially vibration of the weight member 9. In addition, the spacer 10 of the present embodiment is formed of an oval plate that is longer in the front-rear direction of the head than in the toe-heel direction, and thus can exhibit a high vibration suppressing effect against the front-rear force generated when the ball is hit. Moreover, the loosening prevention effect of the weight member 9 can also be enhanced. In order to sufficiently exhibit such an effect, the ratio (L1 / L2) of the length L1 of the spacer 10 in the head longitudinal direction and the length L2 in the toe-heel direction is preferably 1.5 or more. Preferably it is 2.0 or more. On the other hand, if the ratio (L1 / L2) is too large, it tends to cause an increase in weight. Therefore, it is preferably 5.0 or less, more preferably 4.0 or less, and most preferably 3.0 or less.

  Further, the washer member 10 has a protruding portion 19 that protrudes laterally from the head 9 a of the weight member 9 and is visible from the head outer surface side. The overhanging portion 19 can include a pattern display portion 21 provided with a product logo, a mark, and / or a pattern. The pattern display unit 21 is formed by, for example, unevenness by painting or cutting.

  The washer member 10 of the present embodiment configured as described above is in contact with the opening recess 12 of the head main body 1A in a wide range of the inner side surface 10i and the outer peripheral end surface 10p, and therefore absorbs vibration of the head main body 1A that occurs during hitting. As a result, vibration transmission to the head of the weight member 9 is reduced. As a result, the vibration of the weight member 9 that has a large specific gravity and is likely to vibrate can be mitigated, and as a result, a decrease in the fixing strength due to the looseness of the screw shaft portion 9b can be prevented.

  Here, the specific gravity ρs of the washer member 10 is not particularly limited, but if it is too small, there is a tendency that sufficient strength cannot be obtained, and conversely if too large, there is a possibility that the club head 1 cannot be reduced in weight. From such a viewpoint, the specific gravity ρs of the washer member is preferably 0.90 or more, more preferably 1.0 or more, still more preferably 1.5 or more, and most preferably 2.0 or more. Is preferably 10.0 or less, more preferably 9.0 or less, and still more preferably 8.0 or less. The specific gravity ρs of the washer member 10 is set to a specific gravity between the specific gravities ρm and ρw of the head main body 1A and the weight member 9 sandwiching the washer member 10, so that “the head main body 1A, the washer member 10 and the weight “Following performance as a whole combined body” with respect to the impact force when hitting a golf ball of the “combined body with the member 9” is increased. As a result, it is possible to reduce the stress applied between the three members. 9 can be suppressed. Therefore, the specific gravity ρs of the washer member 10 is desirably smaller than the specific gravity ρw of the weight member 9 and larger than the specific gravity ρm of the head body 1A. Further, when the specific gravity ρs of the washer member 10 is reduced, the deformation of the “portion of the washer member 10 that is not restrained by the head portion 9b of the weight member 9” due to the impact force can be reduced. In addition, there is an effect of reducing the weight of the head, and it is preferable to set the specific gravity of the washer member 10 to be smaller than the specific gravity of the head main body 1A and smaller than the specific gravity of the weight member 9.

  Further, if the weight of the washer member 10 is too small, the strength may be insufficient, and conversely, if it is too large, it may be difficult to fix the head body 1A with the weight member 9. From such a viewpoint, the weight of the washer member 10 is preferably 0.01 g or more, more preferably 0.05 g or more, still more preferably 0.1 g or more, and the upper limit is preferably 7 g or less, more preferably. Is 6 g or less, more preferably 5 g or less.

  As a material of such a washer member 10, in addition to a metal material such as stainless steel (specific gravity approximately 8.0) or an aluminum alloy (specific gravity approximately 2.7), various resins such as polyurethane resin (specific gravity 1.2 to ). In particular, in order to increase the tightening strength, a metal material is preferable for the washer member 10. In particular, in order to satisfy the tightening strength, light weight, and vibration absorption by the weight member 9 at a high level, the specific gravity is 2. An aluminum alloy of about 5 to 2.9 is preferred.

  If the thickness t2 (shown in FIG. 6) of the clamped portion 18 of the washer member 10 sandwiched between the head portion 9a of the weight member 9 and the bottom portion 15 of the opening recess 12 is too small, the weight member 9 is tightened. As a result, damage or deformation may occur, and if it is too large, the weight of the washer member 10 may be excessively increased. From such a viewpoint, the thickness t2 is preferably 0.3 mm or more, more preferably 0.4 mm or more, further preferably 0.5 mm or more, and the upper limit is preferably 2.0 mm or less. More preferably, it is 1.5 mm or less, and further preferably 1.0 mm or less.

  Further, as shown in FIG. 4, it is desirable that the head portion 9a of the weight member 9 (and the outer surface 10o of the washer member 10) be stored closer to the hollow portion i than the sole surface 5S of the head body 1A. That is, it is desirable that the outer side surface 9ao of the head portion 9a of the weight member 9 is provided at a position recessed toward the hollow portion i with a distance S (> 0) from the outer surface 5S. Thereby, the contact of the weight member 9 and the washer member 10 to the ground can be prevented during the swing, and as a result, damage or disconnection thereof can be suppressed. Here, if the distance S is too small, the effect cannot be expected sufficiently. Therefore, the distance S is preferably 1.0 mm or more. On the other hand, if the distance S is too large, the center of gravity G of the head may be increased. Therefore, the distance S is preferably 3.0 mm or less.

  Although the embodiments of the present invention have been described above, the present invention can be implemented with various modifications. For example, the position where the weight member 9 is provided is not limited to the sole portion 5 and can be appropriately provided at a position suitable for the intended center of gravity design. Further, as shown in FIG. 7, the washer member 10 may have a flat washer shape in which only the through hole 14a is provided instead of the stepped opening hole 14. In this case, the head portion 9 a of the weight member 9 is provided so as to protrude from the outer surface 10 o of the washer member 10 to the head outer surface side. Further, the present invention is applied to various club heads such as an iron type, a utility type, and a putter type.

Based on the specifications in FIGS. 1 to 4 and Table 1, a wood-type golf club head of the example was made as a prototype, and the joining strength of the weight member was tested. The common specifications for each club head are as follows.
Head volume: 450cm ³ Head weight: 200g
Head body material: Ti-6Al-4V (specific gravity 4.4)
Material of weight member: W-Ni alloy (specific gravity 14.0)
Washer member thickness: 2.0 mm
In addition, a thermosetting adhesive EW2010 manufactured by Sumitomo 3M Co. was applied in advance to the screw shaft portion of the weight member, and after being screwed to the head body, it was heated and cured.

  Further, in order to compare the performance, as shown in FIG. 8, a club head having no washer member (Comparative Example 1) and a washer formed of a metal material having a large specific gravity as shown in FIG. A test was also conducted on a club head (Comparative Example 2) comprising a member b and a screw c having a small specific gravity for fixing the member b to the head body.

In the weight strength test, the same FRP shaft is attached to each test head to make a 45-inch wood golf club, and each club is attached to a swing robot so that the head speed is 50 m / s. A machine test for hitting 3,000 golf balls was performed. Then, every time 100 balls were hit, the joining state of the weight members was examined, and the number of hit balls in which looseness or damage occurred was recorded.
Table 1 shows the test results.

  As a result of the test, it was confirmed that the bonding strength between the weight member and the head main body was very high in the club head of the example.

It is a perspective view of the club head which shows embodiment of this invention. It is the bottom view. FIG. It is A-A 'sectional drawing of FIG. It is a perspective view of a weight member. It is a perspective view of a washer member. It is A-A 'sectional drawing of FIG. 2 which shows other embodiment of this invention. 6 is a partial cross-sectional view of a head of Comparative Example 1. FIG. 10 is a partial cross-sectional view of a head of Comparative Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Golf club head 1A Head main body 2 Face 3 Face part 4 Crown part 5 Sole part 9 Weight member 9a Screw shaft part 9b Head part 10 Washer member 11 Recessed part 12 Opening recessed part 12a Taper part 12b Base part 13 Screw hole part 14 Stepped opening hole 14a Through-hole 14b Head receiving hole 19 Overhang part 21 Pattern display part

Claims (5)

A golf club head in which a weight member having a larger specific gravity than the head body is fixed to a head body made of a metal material,
The head main body is provided with a recess for fixing the weight member,
The concave portion includes an opening concave portion that opens to the outer surface side of the head and has a bottom portion, and a screw hole portion that has a transverse area smaller than the bottom portion and extends from the bottom portion to the inside of the head and has a thread groove formed on the inner peripheral surface. ,
The weight member is made of a metal material having a specific gravity of 8.0 to 19.0, and is formed on a screw shaft portion screwed into the screw hole portion, on the head outer surface side of the screw shaft portion, and on the screw Including a head disposed in the opening recess by having a larger cross-sectional area than the shaft portion,
A golf club head, wherein a washer member is sandwiched between the head and the bottom of the opening recess. The weight member is fixed to the sole base forming the bottom surface of the head body,
The golf club head according to claim 1, wherein the washer member is formed of an oval plate body that is fitted in the opening recess and is longer in the front-rear direction of the head than in the toe-heel direction. The washer member is provided with a through hole on the back face side through which the screw shaft portion of the weight member passes,
On the face side, there is an overhanging portion that protrudes laterally from the head and is visible from the outer surface of the head, and the overhanging portion includes a display portion such as a pattern provided with a mark and / or a pattern. The golf club head according to claim 1, comprising the golf club head. The opening recess of the head main body extends from the bottom to the head outer surface side with substantially the same cross-sectional area and has a depth to accommodate the washer member;
4. The golf club head according to claim 1, further comprising a taper portion that is continuous with the base portion and has a cross-sectional area that gradually increases toward the head outer surface side. 5.   5. The golf club head according to claim 1, wherein the weight member is made of tungsten or a tungsten alloy, and the washer member is made of a resin, an aluminum alloy, or a stainless alloy, and has a specific gravity of 0.9 to 10. 5. .

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