JP7344862B2 - Putter head with intermediate member - Google Patents

Description

The present invention relates to a putter head for constructing a golf putter, and more particularly to a putter head with a customizable intermediate member.

2. Description of the Related Art Conventionally, a technique has been proposed in which an insert made of urethane resin or the like is provided between a front member and a rear member of a putter head in order to absorb the impact and improve the feel when hitting a ball with a putter head. For example, Japanese Patent Application Laid-Open No. 11-114112 discloses that a head body is constructed by combining a front part including a shaft mounting part, which has a face surface that hits the ball, and a rear part behind the face surface, and the front part A putter head is disclosed in which the putter head is formed by cutting an ingot and the rear part is formed by casting.

Furthermore, a technology has been proposed in which the putter characteristics can be adjusted according to the player's physical condition on the day of play, the type of grass on the putting green, the situation, etc. by making the front half and the back half interchangeable. For example, Japanese Patent Application Laid-open No. 2009-297210 discloses a front half body having a shaft attachment part and whose front face is a face surface, a second half body detachably attached to the rear side of the front half body, an insert made of rubber or synthetic resin disposed between the front half body and the second half body, the insert being integral with or separate from the first insert, and having a flat plate shape; and a second insert having a smaller area than the first insert and disposed on the front side of the first insert, and a recess into which the second insert is fitted is provided on the back surface of the front half body. A putter head is disclosed.

Japanese Patent Application Publication No. 11-114112 JP2009-297210A

However, in the putter head shown in Patent Document 1, the insert is intended to fit tightly between the front member and the rear member without any gaps, and there is a problem in that it is difficult to customize the putter head according to the desired performance. . On the other hand, in the putter head shown in Patent Document 2, the front and rear halves of the head can be exchanged in order to adjust the putter characteristics, but performance cannot be customized on the premise that the same halves and halves are used. The problem was that it was difficult to do so.

One of the objects of the embodiments of the present invention is to provide a putter head equipped with a replaceable intermediate member that can be customized in size, shape, and performance according to the user's preferences. Other objects of embodiments of the present invention will become apparent upon reference to the entire specification.

A putter head according to an embodiment of the present invention includes a front member having a shaft attachment portion and whose front surface forms a face surface, and a rear member attached to the rear of the front member, the front member and A replaceable intermediate member is disposed between the rear member and the intermediate member is selectable from among a plurality of intermediate members formed of different sizes, shapes, or materials.

In the putter head according to an embodiment of the present invention, the intermediate member has a smaller specific gravity than the front member and the rear member. Further, the intermediate member is configured such that the specific gravity of the central region is smaller than that of the end portions.

In the putter head according to an embodiment of the present invention, the plurality of intermediate members are formed to differ in at least one of material, specific gravity, shape, size, color, finish, and manufacturing method. Here, in the putter head according to one embodiment of the present invention, the intermediate member can be formed of one or more constituent members.

In the putter head according to one embodiment of the present invention, the material of the plurality of intermediate members is resin, metal, or wood. In the putter head according to one embodiment of the present invention, the material of the plurality of intermediate members is cork, resin, plastic, foamed resin, aluminum, titanium, iron, stainless steel, or tungsten.

In the putter head according to one embodiment of the present invention, the shape of the plurality of intermediate members is square, polygonal, or arcuate.

In the putter head according to one embodiment of the present invention, the specific gravity of the plurality of intermediate members is from 0.1 to 18.

A putter head according to an embodiment of the present invention includes an insertion member for absorbing impact at least between the intermediate member and the front member or between the intermediate member and the rear member.

In the putter head according to one embodiment of the present invention, the insertion member is made of rubber or synthetic resin.

A putter head according to an embodiment of the present invention includes a front member having a shaft attachment portion and whose front surface forms a face surface, and a rear member attached to the rear of the front member, the front member and A replaceable intermediate member is disposed between the rear member and the intermediate member, and the intermediate member has a smaller specific gravity than the front member and the rear member. Further, the intermediate member is configured such that the specific gravity of the central region is smaller than that of the end portions.

Various embodiments of the present invention make it possible to provide a putter head with a replaceable intermediate member that can be customized in size, shape, and performance according to the user's preferences.

1 shows a perspective view of a putter head 1 according to an embodiment. 1 shows an exploded perspective view of a putter head 1 according to an embodiment. 1 shows an exploded perspective view of a putter head 1 according to an embodiment. 1 shows an exploded perspective view of a putter head 1 according to an embodiment. 1 shows an exploded perspective view of a putter head 1 according to an embodiment. 1 shows an exploded perspective view of a putter head 1 according to an embodiment. 1 shows an exploded perspective view of a putter head 1 according to an embodiment. 1 shows an exploded perspective view of a putter head 1 according to an embodiment. 1 shows an exploded perspective view of a putter head 1 according to an embodiment. It shows a performance comparison of putter heads 1 according to one embodiment.

Hereinafter, various embodiments of the present invention will be described with reference to the drawings as appropriate. Note that common components in the drawings are given the same reference numerals.

FIG. 1 is a perspective view schematically showing the configuration of a putter head 1 according to an embodiment of the present invention. Further, FIG. 2 is an exploded perspective view schematically showing the configuration of the putter head 1 according to an embodiment of the present invention. A putter head 1 according to an embodiment of the present invention includes a front member 10, a rear member 20, and an intermediate member 30 interposed therebetween. Here, in the putter head 1 according to an embodiment of the present invention, the intermediate member 30 can be formed of one or more constituent members. As shown in FIG. 2, the putter head 1 according to one embodiment of the present invention may include a vibration isolating member 40 between the front member 10 and the intermediate member 30.

A circular hole 12 is provided on the toe side and the heel side of the face surface 11 of the front member 10, respectively, and an insertion hole 12a for a bolt 13 is penetrated from the deep bottom surface of the circular hole 12 toward the back surface. A hosel 14 projects from the upper surface of the front member 10 on the heel side. The hosel 14 includes a vertical bar portion 14a, a front extending portion 14b extending forward from the upper end of the vertical bar portion 14a (forward when viewed from the face surface 11), and rising upward from the front extending portion 14b. It has a hosel hole portion 14c. The tip of a shaft (not shown) is inserted into this hosel hole 14c and fixed with adhesive or the like. A grip (not shown) is attached to the proximal end of the shaft.

A putter head 1 according to an embodiment of the present invention has a shaft attachment portion (hosel) 14, a front member 10 whose front surface forms a face surface 11, and a rear member 20 attached to the rear of the front member 10. and a replaceable intermediate member 30 disposed between the front member 10 and the rear member 20, the intermediate member 30 having a plurality of intermediate members formed of different sizes, shapes, or materials. It is possible to select from among the members. The intermediate member includes, but is not limited to, cork, resin, plastic, foamed resin, aluminum, titanium, iron, stainless steel, tungsten, etc., for example. Note that the intermediate member 30 is disposed between the front member 10 and the rear member 20, but a portion of the intermediate member 30 is located at at least one of the front member 10 and the rear member 20 ( It may extend to or beyond the position of the front member or the position of the rear member in the front-rear direction. Further, a portion of the intermediate member 30 may be configured to have a width larger than at least one of the front member 10 and the rear member 20 in its width direction.

With the putter head 1 according to an embodiment of the present invention, it is possible to provide a putter head equipped with a replaceable intermediate member that can be customized in size, shape, and performance according to the user's preferences.

The putter head 1 according to an embodiment of the present invention also includes a front member 10 having a shaft attachment portion 14 and whose front surface forms the face surface 11, and a rear member 20 attached to the rear of the front member 10. , and includes a replaceable intermediate member 30 disposed between the front member 10 and the rear member 20, the intermediate member 30 being larger than the front member 10 and the rear member 20 . Constructed with low specific gravity. The intermediate member 30 has a specific gravity of, for example, 0.1 to 18. For example, the specific gravity of foamed resin and cork is approximately 0.1, and the specific gravity of tungsten alloy, lead alloy, and copper alloy is approximately 18, and materials with intermediate specific gravity are also considered.

With the putter head 1 according to an embodiment of the present invention, since the specific gravity of the intermediate member is small, it is possible to suppress an increase in the weight of the entire head even when the size is increased, so that it is possible to maintain the balance of the entire head while meeting the user's preference. Not only can it be customized according to the requirements, but it is also possible to increase the moment of inertia by placing members with high specific gravity in the front and rear.

In the putter head 1 according to an embodiment of the present invention, the plurality of intermediate members 30 are formed to differ in at least one of material, specific gravity, shape, size, color, finish, and manufacturing method.

In the putter head 1 according to an embodiment of the present invention, the material of the plurality of intermediate members is resin, metal, or wood, but is not limited to these. In the putter head 1 according to an embodiment of the present invention, the material of the plurality of intermediate members is, for example, cork, resin, plastic, foamed resin, aluminum, titanium, iron, stainless steel, or tungsten. can also be adopted as appropriate.

In the putter head 1 according to an embodiment of the present invention, the shape of the plurality of intermediate members 30 may be, for example, a square, a polygon, or an arc, but is not limited to these. Here, the term "square, polygon, or arc shape" does not mean in a strict mathematical sense; it includes approximately square, approximately polygon, or approximately arc shape, and even shapes other than these are included. good.

In the putter head 1 according to an embodiment of the present invention, the size of the plurality of intermediate members 30 may be, for example, 3 mm to 100 mm in width between the front member and the rear member, but is not limited to this. do not have.

In the putter head 1 according to an embodiment of the present invention, the plurality of intermediate members 30 can be finished by, for example, plating, metal vapor deposition, painting, polishing, shot blasting, etc., but are not limited thereto. In the putter head 1 according to an embodiment of the present invention, the plurality of intermediate members 30 can be manufactured by, for example, cutting, injection molding, casting, die casting, forging, etc., but are not limited to these. .

The putter head 1 according to an embodiment of the present invention includes an insert for impact absorption between the intermediate member 30 and the front member 10 or between the intermediate member 30 and the rear member 20. A member 40 may also be provided. In the putter head 1 according to an embodiment of the present invention, the insertion member 40 is made of rubber or synthetic resin. In the example of FIG. 2 (referred to as STD), the putter head 1 is configured to include a vibration isolating member 40 between the front side member 10 and the intermediate member 30, and the vibration isolating member 40 is made of EPDM rubber. There is.

Next, possible embodiments of the different intermediate members 30 will be explained in more detail with reference to FIGS. 3-5. FIG. 3 is an exploded perspective view schematically showing the configuration (referred to as MID) of the putter head 1 according to an embodiment of the present invention. A putter head 1 according to an embodiment of the present invention includes a front member 10, a rear member 20, and an intermediate member 30 interposed therebetween. Compared to the intermediate member 30 shown in FIG. 2, the intermediate member 30 shown in FIG. 3 has a larger width in the front-rear direction, which is 30 mm. As shown in FIG. 3, the putter head 1 according to an embodiment of the present invention may include a vibration isolation member 40 between the front member 10 and the intermediate member 30. In the example shown in FIG. 2, the depth of the center of gravity is shallower and the moment of inertia (MOI) is smaller than in the embodiment shown in FIG. It is suitable for players who have a short swing stroke and who adjust their sense of distance based on tempo and feel, and who can control direction and distance by themselves according to their sense. On the other hand, it is suitable for players who have a long swing stroke and adjust the sense of distance by adjusting the tempo and swing width to swing more stably.

Similar to FIG. 2, the putter head 1 shown in FIG. 3 is provided with a circular hole 12 on the toe side and heel side of the face surface 11 of the front side member 10, respectively, and a circular hole 12 is provided on the toe side and heel side of the face surface 11 of the front side member 10, and a circular hole 12 is provided from the deep bottom surface of the circular hole 12 toward the back surface. An insertion hole 12a for the bolt 13 is provided therethrough. A hosel 14 projects from the upper surface of the front member 10 on the heel side. The hosel 14 includes a vertical bar portion 14a, a front extending portion 14b extending forward from the upper end of the vertical bar portion 14a (forward when viewed from the face surface 11), and rising upward from the front extending portion 14b. It has a hosel hole portion 14c. The tip of a shaft (not shown) is inserted into this hosel hole 14c and fixed with adhesive or the like. A grip (not shown) is attached to the proximal end of the shaft.

Next, FIG. 4 is an exploded perspective view schematically showing the configuration (referred to as WIDE) of the putter head 1 according to an embodiment of the present invention. Note that the configuration of the putter head 1 having the same shape as the WIDE and approximately the same weight as the STD will be hereinafter referred to as WIDE360. A putter head 1 according to an embodiment of the present invention includes a front member 10, a rear member 20, and an intermediate member 30 interposed therebetween. Compared to the intermediate member 30 shown in FIG. 3, the intermediate member 30 shown in FIG. 4 has a larger width in the front-rear direction, which is 50 mm. As illustrated, the putter head 1 according to an embodiment of the present invention may include a vibration isolating member 40 between the front member 10 and the intermediate member 30. The other configurations are basically the same as those in FIGS. 2 and 3, so details will be omitted. The example of FIG. 4 has a deeper center of gravity and a larger moment of inertia (MOI) than the embodiment of FIG. It is suitable for players who have a long swing stroke and who adjust their sense of distance by adjusting the tempo and swing width, and to swing more stably. This is because the larger the value of the moment of inertia (MOI), the more difficult it becomes for the player to adjust directionality and sense of distance, but this leads to more stable strokes and impact.

Furthermore, with reference to FIG. 5, the configuration of the putter head 1 (referred to as WIDE 360) according to an embodiment of the present invention will be described. FIG. 5 is an exploded perspective view schematically showing the configuration of a putter head 1 according to an embodiment of the present invention. A putter head 1 according to an embodiment of the present invention includes a front member 10, a rear member 20, and an intermediate member 30 interposed therebetween. Compared to the intermediate member 30 shown in FIGS. 3 and 4, the intermediate member 30 shown in FIG. 5 has a wider width in the front-rear direction, which is 65 mm. As illustrated, the putter head 1 according to an embodiment of the present invention may include a vibration isolating member 40 between the front member 10 and the intermediate member 30. The other configurations are basically the same as those in FIGS. 2 and 3, so details will be omitted. The example in FIG. 5 has a deeper center of gravity and a larger moment of inertia (MOI) than the embodiment in FIG. It is suitable for players who have a long swing stroke and who adjust their sense of distance by adjusting the tempo and swing width, and to swing more stably. This is because the larger the value of the moment of inertia (MOI), the more difficult it becomes for the player to adjust directionality and sense of distance, but this leads to more stable strokes and impact.

In this way, by selecting various intermediate members, customization can be performed according to the user's preferences. In addition, by reducing the specific gravity of the intermediate member, it is possible to suppress the increase in the weight of the entire head even if the size is increased, so it is possible to maintain the balance of the entire head, and it is possible to place members with higher specific gravity in the front and rear. This makes it possible to increase the moment of inertia.

Next, referring to FIG. 10, the results of the velocity, angular velocity, and spin amount for each aspect of FIG. 2-4 (the aspect of FIG. 4 includes both WIDE and WIDE360) are calculated for 0.03 seconds after impact. ,
It is shown divided into 0.01 seconds after the first bounce. Measurements were performed three times for each aspect, and the results are shown together with the average value. Here, in FIG. 10, as described above, the aspect of FIG. 2 is shown as STD, the aspect of FIG. 3 is shown as MID, and the aspect of FIG. 4 is shown as WIDE, which corresponds to WIDE360.

First, the test results of STD and MID will be compared. As shown in the figure, in STD, the average velocity at impact is 2.19 m/s, the average angular velocity is -180 deg/s, the average velocity at first bounce is 2.12 m/s, and the average angular velocity is 713 deg/s. In contrast, with MID, the average speed at impact is 2.27 m/s, the average angular velocity is -181 deg/s, the average speed at first bounce is 2.22 m/s, and the angular velocity is The average is 664 deg/s.

Also, as shown in the figure, in STD, the average spin rate at impact is -30.0 rpm and the average spin rate at first bounce is 118.9 rpm, whereas in MID, the average spin rate at impact is -30.0 rpm, and the average spin rate at impact is 118.9 rpm. The average spin amount is 30.1 rpm, and the average spin amount at the first bounce is 110.7 rpm.

From these results, compared to MID, STD has a shallower center of gravity and a smaller moment of inertia (MOI), so for players who have a smaller swing stroke and adjust their sense of distance with tempo and feel, STD has a shallow center of gravity and a smaller moment of inertia (MOI). It turns out that it is suitable for controlling the direction and distance by yourself according to the situation. Also, it can be seen that STD has the characteristic that it does not roll too much compared to MID even if there is a strong impact with a short stroke. On the other hand, it can be seen that MID is suitable for players who have a large swing stroke and who adjust the sense of distance by adjusting the tempo and swing width to swing more stably.

Next, the WIDE and MID test results will be compared. As shown in the figure, in WIDE, the average velocity at impact is 2.41 m/s, the average angular velocity is -180.6 deg/s, the average velocity at first bounce is 2.27 m/s, and the average angular velocity is On the other hand, with MID, the average speed at impact is 2.27m/s, the average angular velocity is -181deg/s, and the average speed at first bounce is 2.22m/s. , the average angular velocity is 664 deg/s.

Also, as shown in the figure, in WIDE, the average spin amount at impact is -30.1 rpm and the average spin amount at first bounce is 91.3 rpm, whereas in MID, the average spin amount at impact is -30.1 rpm, and the average spin amount at impact is 91.3 rpm. The average spin amount is 30.1 rpm, and the average spin amount at the first bounce is 110.7 rpm.

For these reasons, WIDE has a deeper center of gravity and a larger moment of inertia (MOI) than MID, and the larger the moment of inertia (MOI), the easier it is for the player to adjust directionality and sense of distance. Although it is more difficult to do, it can be seen that it leads to improved stroke and impact stability.

Next, the test results of WIDE and WIDE360 will be compared. As shown in the figure, in WIDE, the average velocity at impact is 2.41 m/s, the average angular velocity is -180.6 deg/s, the average velocity at first bounce is 2.27 m/s, and the average angular velocity is In contrast, with WIDE360, the average speed at impact is 2.26 m/s, the average angular velocity is -121 deg/s, and the average speed at first bounce is 2.22 m/s. , the average angular velocity is 412 deg/s.

Also, as shown in the figure, in WIDE, the average spin rate at impact is -30.1 rpm and the average spin rate at first bounce is 91.3 rpm, whereas in WIDE 360, the average spin rate at impact is -30.1 rpm, and the average spin rate at impact is 91.3 rpm. The average spin amount is -20.13 rpm, and the average spin amount at the first bounce is 68.6 rpm.

For these reasons, WIDE has a deeper center of gravity and a larger moment of inertia (MOI) than WIDE360, which is lighter and has the same weight as STD. Although it becomes difficult for the player to adjust directionality and sense of distance, it can be seen that this leads to improved stability of strokes and impact. Further, WIDE 360 has the same appearance as WIDE, but can exhibit overall performance close to MID, and can be selected according to the player's preference.

Further, what types of different intermediate members 30 can be considered will be described with reference to FIGS. 6-9 regarding a modification of the example shown in FIG. 5. FIG. 6 is a perspective view schematically showing the configuration of a putter head 1 according to an embodiment of the present invention. A putter head 1 according to an embodiment of the present invention includes a front member 10, a rear member 20, and an intermediate member 30 interposed therebetween. The intermediate member 30 shown in FIG. 6 has the same width in the front and back direction as in FIG. A notch 50 is formed. The other configurations are basically the same as those in FIGS. 2, 3, etc., so details will be omitted. This has the effect of making it easier for the player to draw the stroke straight (improved alignment). In addition, if the intermediate member 30 becomes larger, the sound when the ball is hit tends to be dull, and the cutout shape also has the effect of suppressing the echo sound when the ball is hit (particularly when the width of the intermediate member is about 10 mm or more) (There is a tendency for the sound of the ball to become dull.)

FIG. 7 is a perspective view schematically showing the configuration of a putter head 1 according to an embodiment of the present invention. A putter head 1 according to an embodiment of the present invention includes a front member 10, a rear member 20, and an intermediate member 30 interposed therebetween. The intermediate member 30 shown in FIG. 7 has the same width in the front-rear direction as in FIGS. 5 and 6, which is 65 mm, but from the viewpoint of improving the moment of inertia, reducing weight, and improving rigidity, the intermediate member 30 has a substantially square shape in the center part. A shaped notch 51 and a rigid reinforcing member 60 are formed. The other configurations are basically the same as those in FIGS. 2, 3, etc., so details will be omitted. As mentioned above, this has the effect of making it easier for the player to draw the stroke straight (improvement of alignment). In addition, if the intermediate member 30 becomes larger, the sound when the ball is hit tends to be dull, and the cutout shape also has the effect of suppressing the echo sound when the ball is hit (particularly when the width of the intermediate member is about 10 mm or more) (There is a tendency for the sound of the ball to become dull.)

FIG. 8 is a perspective view schematically showing the configuration of a putter head 1 according to an embodiment of the present invention. A putter head 1 according to an embodiment of the present invention includes a front member 10, a rear member 20, and an intermediate member 30 interposed therebetween. The intermediate member 30 shown in Fig. 8 has the same width in the front and back direction as in Figs. Two substantially circular notches 52 are formed. The other configurations are basically the same as those in FIGS. 2, 3, etc., so details will be omitted. This has the effect of making it easier for the player to draw the stroke straight (improved alignment). In addition, if the intermediate member 30 becomes larger, the sound when the ball is hit tends to be dull, and the cutout shape also has the effect of suppressing the echo sound when the ball is hit (particularly when the width of the intermediate member is about 10 mm or more) (There is a tendency for the sound of the ball to become dull.)

FIG. 9 is a perspective view schematically showing the configuration of a putter head 1 according to an embodiment of the present invention. A putter head 1 according to an embodiment of the present invention includes a front member 10, a rear member 20, and an intermediate member 30 interposed therebetween. The intermediate member 30 shown in FIG. 9 has the same width in the front-rear direction as in FIGS. Two approximately oval-shaped notches 53 are formed in the portion. The other configurations are basically the same as those in FIGS. 2, 3, etc., so details will be omitted. This has the effect of making it easier for the player to draw the stroke straight (improved alignment). In addition, if the intermediate member 30 becomes larger, the sound when the ball is hit tends to be dull, and the cutout shape also has the effect of suppressing the echo sound when the ball is hit (particularly when the width of the intermediate member is about 10 mm or more) (There is a tendency for the sound of the ball to become dull.)

In this way, by selecting various intermediate members even if they are of the same size, it is possible to customize the intermediate member according to the user's preference. In addition, by reducing the specific gravity of the intermediate member, it is possible to suppress the increase in the weight of the entire head even if the size is increased, so it is possible to maintain the balance of the entire head, and it is possible to place members with higher specific gravity in the front and rear. This makes it possible to increase the moment of inertia.

The dimensions, materials, and arrangement of each component described herein are not limited to those explicitly described in the embodiments, and each component may be any number that may fall within the scope of the present invention. dimensions, materials, and arrangements. Further, components not explicitly described in this specification can be added to the described embodiments, or some of the components described in each embodiment can be omitted.

1 Putter head 10 Front member 11 Face surface 12 Circular hole 12a Insertion hole 13 Bolt 14 Hosel 14a Vertical bar portion 14b Front extension portion 14c Hosel hole portion 20 Rear member 30 Intermediate member 40 Vibration isolating member 50 Notch 51 Notch 52 Notch 53 Notch 60 Rigid reinforcement member

Claims (10)

A putter head comprising: a front member having a shaft attachment portion and whose front surface forms a face surface; and a rear member attached to the rear of the front member,
A replaceable intermediate member is disposed between the front member and the rear member, and the intermediate member is selectable from among a plurality of intermediate members formed of different sizes, shapes, or materials. The putter head is characterized in that the intermediate member has a lower specific gravity than the front side member and the rear side member, and the intermediate member has a lower specific gravity in a central region than in its end portions. The putter head according to claim 1 , wherein the plurality of intermediate members are formed to differ in at least one of material, specific gravity, shape, size, color, finish, and manufacturing method. The putter head according to claim 1 or 2 , wherein the material of the plurality of intermediate members is resin, metal, or wood. The putter head according to claim 3 , wherein the material of the plurality of intermediate members is cork, resin, plastic, foamed resin, aluminum, titanium, iron, stainless steel, or tungsten. The putter head according to any one of claims 1 to 4 , wherein the shape of the plurality of intermediate members is square, polygonal, or arcuate. The putter head according to any one of claims 1 to 5 , wherein the plurality of intermediate members have a specific gravity of 0.1 to 18. 7. A putter head according to any one of claims 1 to 6 , wherein the intermediate member is formed by one or more components. According to any one of claims 1 to 7 , an insertion member for shock absorption is provided between the intermediate member and the front member or between the intermediate member and the rear member. Putter head as described. The putter head according to claim 8 , wherein the insertion member is made of rubber or synthetic resin. A putter head comprising: a front member having a shaft attachment portion and whose front surface forms a face surface; and a rear member attached to the rear of the front member,
A replaceable intermediate member is provided between the front member and the rear member, the intermediate member has a lower specific gravity than the front member and the rear member, and the intermediate member has an end thereof A putter head characterized in that the specific gravity of the central region is smaller than that of the central region .

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