KR20210119265A - Golf club head and golf club - Google Patents

Abstract

The objective of the present invention is to provide a golf club head capable of adjusting a trajectory of a batted golf ball so as to approximate the trajectory intended by a player, and a golf club having the same. According to one embodiment of the present invention, the golf club head comprises: a head body which is attachable to a shaft; and a weight attachment portion which is formed on the head body and has a plurality of attachment locations to which weights can be attached, wherein the plurality of attachment locations are on a path equidistant from a vertical axis passing through the center of gravity of the head body, where the shaft is fixed at a lie angle of 60°.

Description

GOLF CLUB HEAD AND GOLF CLUB

The present invention relates to a golf club head and a golf club.

As a golf club head, the one to which a weight can be attached so that a position change is possible is used. The player can adjust the height of the trajectory of the batted ball, the adjustment of the left and right directionality, and the operability by adjusting the weight according to his or her preference.

For example, by fixing a weight member (weight) at any of a plurality of attachment positions located on an imaginary cylindrical surface centered on the axis of the shaft in the golf club head, the position of the weight member is equidistant from the axis of the shaft. , which can be changed to , has been proposed (see Japanese Patent Application Laid-Open No. 2010-148702).

Japanese Patent Laid-Open No. 2010-148702

In the golf club head, the angle of the center of gravity can be changed by changing the position of the weight member, and the angle of the face surface can be changed by changing the angle of the center of gravity. However, in this golf head, there is a possibility that the trajectory (bent state) of the batted ball not intended by the player may occur due to the change of the center of gravity angle.

In view of the above circumstances, an object of the present invention is to provide a golf club head capable of adjusting the trajectory of a batted ball so as to approximate the trajectory intended by a player, and a golf club having the same.

A golf club head according to an embodiment of the present invention made to solve the above problems is a golf comprising a head body attachable to a shaft, and a weight attachment part formed on the head body and having a plurality of attachment positions capable of attaching weights. a club head, wherein the plurality of attachment locations are on a path equidistant from a vertical axis through the center of gravity of the head body with the shaft fixed at a lie angle of 60°.

Preferably, the weight attachment portion is capable of guiding the weight, has a rail portion extending on the path, the weight is movably coupled to the rail portion, and is configured to be fixed at an arbitrary position of the rail portion .

It is preferable that the weight attachment part is engageable with the weight, has a plurality of coupling parts spaced apart from each other on the path, and is configured such that the weight is coupled to any one of the plurality of coupling parts.

A moment of inertia around a vertical axis passing through the center of gravity of the head body in a state where the weight is attached to an arbitrary attachment position in the weight attachment portion and the shaft is fixed at a lie angle of 60° is 5500 g It is preferable that it is more than *cm<2>.

Preferably, the difference between the maximum value and the minimum value of the moment of inertia when the attachment position is changed is within 5% of the minimum value.

A golf club according to another embodiment of the present invention made to solve the above problems is a golf club including a shaft, a golf club head attachable to the shaft, and a weight attachable to the golf club head, the golf club a head body having a head attachable to the shaft; and a weight attachment portion formed on the head body and having a plurality of attachment positions to which the weights can be attached, wherein the plurality of attachment positions are fixed to the shaft at a lie angle of 60° It is on a path equidistant from a vertical axis passing through the center of gravity of the head body in a closed state.

In addition, the "lie angle" means an angle of the shaft central axis with respect to the horizontal plane. The "center of gravity of the head body" means the center of gravity of the head body in a state where no weight is attached. "Vertical axis" means an axis perpendicular to the horizontal plane. "The attachment position is equidistant from the vertical axis" means that the attachment position is not only at the exact same distance from the vertical axis, but also at a different distance from the vertical axis within 5%.

(Effects of the Invention)

Since the golf club head according to the present invention can change the center of gravity angle while suppressing the change in the moment of inertia because the attachment position is equidistant from the vertical axis passing through the center of gravity, the trajectory of the batted ball is adjusted to be close to the trajectory intended by the player it is possible to do Since the golf club according to the present invention is provided with the golf club head, it is possible to adjust the trajectory of the batted ball to approximate the trajectory intended by the player as described above.

1 is a schematic perspective view showing a state in which a golf club head according to a first embodiment of the present invention is fixed at a lie angle of 60°.
FIG. 2 is a schematic plan view of the golf club head of FIG. 1 as viewed from above in FIG. 1 .
3 is a schematic diagram for explaining a center of gravity angle.
Fig. 4 is a schematic plan view of a golf club head according to a third embodiment of the present invention as viewed from the downward direction and the same direction as in Fig. 1 .
Fig. 5 is a schematic plan view of a golf club head according to a fifth embodiment of the present invention as viewed from the same direction as Fig. 2;
Fig. 6 is a schematic plan view of a golf club head according to a seventh embodiment of the present invention as viewed from the same direction as Fig. 4;

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail, referring drawings suitably. In the following embodiments, a wood-type golf club head is exemplified as the golf club head, but the golf club head may be an iron-type golf club head, a utility-type (hybrid type) golf club head, or the like.

[First Embodiment]

<Golf Club Head>

1 and 2 show a golf club head 1 according to an embodiment of the present invention.

As shown in FIG. 1 , the golf club head 1 includes a head body 2 attachable to a shaft 50 , and a plurality of attachment positions formed on the head body 2 and capable of attaching a weight 40 . and a weight attachment portion (10) having a The golf club head 1 further includes a weight 40 . The golf club head 1 further includes a first filling member (not shown). 1 shows a state in which the golf club head is attached to the shaft 50 .

In addition, in FIG. 1 , the shaft 50 is fixed at a lie angle of 60°, that is, in a state where the angle with respect to the horizontal plane of the central axis S (see FIG. 3 ) of the shaft 50 is fixed to be 60°. of the golf club head 1 is schematically shown. FIG. 2 schematically shows the golf club head in the state shown in FIG. 1 from above in FIG. 1 .

(head body)

The head body 2 is attachable to the shaft 50 . The head body 2 has a face part (hit ball surface) 3, a sole part (bottom surface) 4, a crown part (upper surface) 5, and a shaft hole 6 into which the shaft 50 is inserted and fixed. It is provided with a hosel part (7) having. In the present embodiment, the weight attachment portion 10 is formed on the crown portion 5 of the head body 2 .

As a material of the head body 2, stainless copper, a titanium alloy, an aluminum alloy, tungsten etc. are mentioned, for example. In addition, the head body 2 may be formed of a part different in material.

(weight attachment part)

As shown in FIGS. 1 and 2 , in the present embodiment, the weight attachment portion 10 is formed on the crown portion 5 of the head body 2 . The weight attachment part 10 is equidistant from the vertical axis L1 passing the center of gravity G1 of the head body 2 in a state in which the shaft 50 is fixed at a lie angle of 60° (the state of FIG. 1 ). It is on path P1. The center of gravity G1 is the center of gravity of the head body 2 in a state in which the weight 40 is not attached to the head body 2 .

In this embodiment, the weight attachment part 10 can guide the weight 40, has a rail part 11 extending on the path P1, and the weight 40 is movable with the rail part 11 It is coupled and configured to be fixed at any position of the rail portion 11 .

The rail part 11 is formed in a groove shape so that the cross section becomes a concave shape in the crown part 5 of the head body 2, and the golf club head 1 is fixed so that the lie angle is 60° as described above. It is formed to have an arc shape centered on the center of gravity (G1) when viewed from a planar state. As shown in FIG. 2, the rail part 11 has a bottom face part 11a along the longitudinal direction (the arc extension direction), and the width direction of the bottom face part 11a (the direction perpendicular to the longitudinal direction, that is, the diameter of the arc). direction) respectively upward (for example, perpendicular to the bottom surface portion 11a) from both end edges, and has two side portions 11b extending along the longitudinal direction. The two side portions 11b are arranged parallel to each other.

In FIG. 2 , the bottom surface portion 11a (ie, the rail portion 11 ) is formed to express an arc shape centered on the center of gravity G1 in the width direction (diameter direction) of the center when viewed from the top. The locus expressed by the center in the width direction is the path P1, and the distance between the vertical axis L1 and the path P1 corresponds to the radius R of the arc. Let the radius of this path P1 be R [mm], and the width of the rail part 11 is X [mm] The radius of R becomes the length (R+X/2) plus the length of 1/2 of the width X of the rail part 11 plus the length (R-X/2) with respect to R.

In addition, as described above, when the path P1 is equidistant from the vertical axis L1, the central position in the width direction (radial direction) of the entire rail portion 11 included in the path P1 is from the vertical axis L1. A case where any of the above-mentioned widthwise central positions in the path P1 are at different distances within 5% from the vertical axis L1 other than being at the exact same distance is also included.

Coupling grooves 13 extending along the longitudinal direction are formed in both side portions 11b, respectively. These coupling grooves 13 are formed parallel to the bottom portion 11a. These coupling grooves 13 are coupled to each coupling piece portion 40b of the weight 40 to be described later, and are formed to guide the weight 40 in the longitudinal direction.

<Weight>

The weight 40 is for adjusting the center of gravity angle. The weight 40 can be attached to the weight attachment portion 10 formed in the head body 2 , and, here, to the rail portion 11 . The weight 40 includes a main body portion 40a constituting its main body, two engaging piece portions 40b capable of being engaged in each engaging groove 13 of both side portions 11b of the rail portion 11, and a main body portion 40a ) has a first fixing portion (40c) for fixing to the rail (11).

The body portion 40a is formed to be slidable on both side portions 11b of the rail portion 11 . A screw hole through which the first fixing portion 40c is screwed is formed in the main body portion 40a.

Each coupling piece portion 40b engages with each coupling groove 13 of both side portions 11b of the rail portion 11, and the body portion 40a when viewed from a plan view so as to be guided to each coupling groove 13. It is formed to protrude outward from both sides in a direction perpendicular to the longitudinal direction.

The first fixing portion 40c is formed by, for example, a screw (male screw) having a flat portion at its tip. The first fixing portion 40c is formed so as to penetrate the screw hole of the main body portion 40a while screwing it. The first fixing portion 40c presses the bottom surface portion 11a of the rail portion 11 by screwing it in at the tip end thereof, and each engagement piece portion 40b is fixed to each engagement portion 31b by this pressing pressure. It is formed (so that the weight 40 is fixed to the rail part 11).

The density of the weight 40 is preferably greater than the density of the head body 2 . In this way, since the density of the weight 40 is greater than the density of the head body 2, the amount of change in the center of gravity angle when the attachment position of the weight 40 is changed can be made larger. Even when the amount of change in the center of gravity angle is large as described above, since a plurality of attachment positions of the weight 40 are on the path P1, it is possible to suppress a change in the moment of inertia due to a change in the attachment position.

<First Filling Member>

The golf club head 1 further includes a first filling member (not shown) filled in an area of the rail portion 11 to which the weight 40 is not attached, and the mass of the first filling member It is preferably smaller than the mass of the weight 40 . In addition, it is preferable that the specific gravity of the first filling member is equal to or less than that of the head body 2 . For example, as a forming material of such a 1st filling member, when the forming material of the head main body 2 is titanium, resin other than titanium, magnesium, aluminum, etc. are mentioned, for example.

When the first filling member is filled in the region of the rail portion 11 to which the weight 40 is not attached, it is possible to suppress entry of sand, dust, and the like from the external environment into the rail portion 11 . Further, since the first filling material is lighter than the weight 40, the influence of the first filling material on the moment of inertia can be reduced.

Dimensions such as length, width, and depth of the rail portion 11 are not particularly limited and are appropriately set. For example, the dimensions of the rail portion 11 can be appropriately set so that a desired amount of change in the center of gravity angle is obtained.

<Adjustment of the center of gravity angle>

For example, as shown in FIG. 3 , in the golf club head 1 in a state where the shaft 50 is attached and the weight 40 is not attached, the golf club head 1 is the shaft 50 ) When the shaft 50 is horizontally supported in a circumferentially rotatable state, viewed from the central axis (S) direction of the shaft 50, an imaginary straight line in the vertical direction passing through the central axis (S) and the face portion (3) The angle formed by the extension direction of (the batted ball) is the center of gravity angle (θ). At this time, the center of gravity G1 of the golf club head 1 in a state in which the weight 40 is not attached exists on an imaginary straight line in the vertical direction. In addition, since the face part 3 is not normally planar, the extension direction of the face part 3 makes the tangential direction of the leading edge of the center of the face part 3 a reference|standard (the extension direction of the face part 3).

From this state, the weight 40 is inserted into the rail portion 11, and each engagement piece portion 40b of the weight 40 is inserted into each engagement groove 13 of each side surface portion 11b. Thereby, in the rail part 11, each engagement piece part 40b is guided by each engagement groove 13, and the weight 40 is movable (possible to change a position) in the longitudinal direction of the rail part 11, and is attached. do. While each engaging piece portion 40b engages with each engaging groove 13 of the rail portion 11 , the weight 40 is inserted into the rail portion 11 , so that the weight 40 does not fall off from the rail portion 11 . The inside of this rail part 11 becomes movable.

Next, the weight 40 is moved to an arbitrary attachment position in the rail part 11, and the weight 40 is fixed at that position by screwing in the 1st fixing part 40c. Since the position of the center of gravity of the golf club head 1 (center of gravity after attaching the weight 40) from the state shown in Fig. 3 according to this attachment position is changed (not shown), according to this change, the center of gravity angle ( θ) is changed.

On the other hand, by holding the screw insertion of the first fixing part 40c from this state in which the weight 40 is attached in this way, the fixing of the weight 40 is released and the weight 40 is movable in the rail part 11 . becomes The weight 40 is fixed again by moving the weight 40 to an arbitrary attachment position different from the past attachment position, and screwing in the first fixing portion 40c. According to the change of the attachment position of the weight 40, the position of the center of gravity of the golf club head 1 (the center of gravity of the golf club head in the state where the weight 40 is attached) changes, and according to this change, the position of the center of gravity of the golf club head 1 is changed. The center of gravity angle θ is changed.

In this embodiment, the attachment position of the weight 40 to the rail portion 11 is on the path P1 that is equidistant (radius R) from the vertical axis L1 passing through the center of gravity G1, so that the center of gravity angle When the attachment position of the weight 40 is changed to change (θ), the change in the moment of inertia can be reduced.

A state in which the weight 40 is attached to an arbitrary attachment position in the weight attachment portion 10 (here, the rail portion 11) and the shaft 50 is fixed at a lie angle of 60°. The lower limit of the moment of inertia around the vertical axis L1 passing through the center of gravity G1 of the head body 2 is preferably 5500 g·cm 2 , more preferably 5700 g·cm 2 , and still more preferably 5800 g·cm 2 . When the moment of inertia does not satisfy the lower limit, the fall of the flying distance during an off-center hit increases, and as a result, there is a risk that the head body 2 is weak against a miss shot. On the other hand, the larger the moment of inertia, the better, and the upper limit is not particularly limited. The upper limit of this moment of inertia may be limited by, for example, a tool rule or the like. In such a case, the upper limit of the moment of inertia may be appropriately set according to a tool rule or the like. For example, in the case where the upper limit of the moment of inertia is set at 5900+100 g·cm 2 (that is, 6000 g·cm 2 ) by the tool rule, the upper limit of the moment of inertia is 6000 g·cm 2 according to the tool rule in order to conform to the tool rule. It can be set in cm2.

The difference between the maximum value and the minimum value of the moment of inertia when the attachment position is changed is preferably within 5% of the minimum value, more preferably within 3%, and still more preferably within 2%. When the difference exceeds the above range, an attachment location having a smaller moment of inertia among a plurality of attachment locations occurs, and when the weight 40 is attached to this attachment location, the drop of the flying distance during off-center hit increases, As a result, there is a possibility that the head body 2 is weak against a miss shot.

<Advantage>

The golf club head 1 has a weight ( 40), the change in the moment of inertia before and after the change can be reduced. Accordingly, the golf club head 1 can adjust the trajectory of the batted ball to approximate the trajectory intended by the player.

[Second embodiment]

<Golf Club>

The golf club of this embodiment is provided with the shaft 50 and the said golf club head 1 mentioned above. The shaft 50 is not particularly limited, and a conventionally known shaft 50 can be employed. The golf club head 1 is as described above. Therefore, the detailed description of the golf club of this embodiment is abbreviate|omitted.

<Advantage>

Since the golf club of this embodiment is provided with the said golf club head 1, as mentioned above, the trajectory of a batted ball can be adjusted so that it may approximate the trajectory intended by a player.

[Third embodiment]

4 shows a golf club head 1' according to another embodiment of the present invention. The golf club head 1 ′ includes a head body 2 attachable to a shaft 50 (see FIG. 1 ) and a plurality of attachment locations formed on the head body 2 and for attaching a weight 40 . and a weight attachment part 10 having The golf club head 1 ′ further includes a weight 40 . The golf club head 1' further includes a first filling member (not shown).

In the golf club head 1' of the present embodiment, the weight attachment portion 10 is formed on the sole portion 4 of the head body 2 . The configuration other than that is the same as that of the above-described first embodiment. Accordingly, a detailed description of the golf club head 1' is omitted.

<Advantage>

The golf club head 1' has the weight 40 to change the center of gravity angle θ by the attachment position of the weight 40 being equidistant (here, the radius R) from the vertical axis L1 passing through the center of gravity G1. When the attachment position of (40) is changed, the change in the moment of inertia before and after the change can be reduced. Accordingly, the golf club head 1' can adjust the trajectory of the batted ball to approximate the trajectory intended by the player.

[Fourth embodiment]

<Golf Club>

The golf club of this embodiment is provided with the shaft 50 and the said golf club head 1' mentioned above. The shaft 50 is not particularly limited, and a conventionally known shaft 50 can be employed. The golf club head 1' is as described above. Therefore, the detailed description of the golf club of this embodiment is abbreviate|omitted.

<Advantage>

Since the golf club of the present embodiment includes the golf club head 1', the trajectory of the batted ball can be adjusted so as to approximate the trajectory intended by the player as described above.

[Fifth embodiment]

<Golf Club Head>

5 shows a golf club head 20 according to another embodiment of the present invention. The golf club head 20 includes a head body 2 attachable to a shaft 50 (see FIG. 1 ), and a plurality of attachment positions formed on the head body 2 and for attaching a weight 45 . and a weight attaching part (30) having a The golf club head 20 further includes a weight 45 . The golf club head 20 further includes a second filling member (not shown).

In addition, FIG. 5 shows a state in which the shaft 50 is fixed at a lie angle of 60° as in FIG. 1 , that is, the angle with respect to the horizontal plane of the central axis S (see FIG. 3 ) of the shaft 50 is 60°. The golf club head 20 in a fixed state is schematically shown from above.

(head body)

In the present embodiment, the weight attachment portion 30 is formed on the crown portion 5 of the head body 2 . Since the structure of the head main body 2 other than that is the same as that of 1st Embodiment, the same code|symbol is attached|subjected to the same structure, and description is abbreviate|omitted.

(weight attachment part)

In the present embodiment, the weight attachment portion 30 is formed on the crown portion 5 of the head body 2 . The weight attachment part 30 is a path equidistant from the vertical axis L2 passing the center of gravity G2 of the head body 2 in a state in which the shaft 50 is fixed at a lie angle of 60° (see FIG. 1 ). It is on (P2). The center of gravity G2 is the center of gravity of the head body 2 in a state in which the weight 45 is not attached to the head body 2 .

In the present embodiment, the weight attachment portion 30 is capable of being coupled to the weight 45 , and has a plurality of coupling portions 31 disposed at intervals from each other on the path P2 , and the weight 45 is coupled to a plurality of coupling portions 31 . It is configured to be coupled with any of the parts 31 .

The plurality of engaging portions 31 are formed in the crown portion 5 of the head body 2 in the present embodiment. The plurality of engaging portions 31 may be engaged with the weight 45, respectively, and are not particularly limited. For example, the plurality of coupling portions 31 are formed in a concave hole shape. The plurality of coupling portions 31 are formed on a circular arc-shaped locus centered on the center of gravity G2 when viewed from a plan view with the golf club head 20 fixed so that the lie angle becomes 60° as described above. formed to be placed. The engaging portion 31 includes, for example, a bottom surface portion 31a having a circular shape, a polygonal shape, etc. (circular in FIG. 5 ) in plan view, and upward from the peripheral edge of the bottom surface portion 31a (for example, , a side portion 31b extending perpendicularly to the bottom surface portion 31a), and a screw hole portion 31c formed in the bottom surface portion 31a. Each coupling part 31 is formed in the same shape and the same dimension.

In FIG. 5 , the plurality of coupling parts 31 are arranged such that their respective centers (radial centers) express an arc shape centered on the center of gravity G2 when viewed from a plan view. In this way, the trajectory expressed by the respective centers is the path P2, and the distance between the vertical axis L2 and the path P2 corresponds to the radius R. In this way, if the radius of the path P2 is R and [mm], and the width (diameter in Fig. 5) in the radial direction of each engaging portion 31 is X [mm], the The radius of the arc expressed by the edge edges (outer edges in the radial direction) farthest from the center of gravity (G2) is R plus the length of 1/2 of the width X of the coupling part 31 (R+X/2). and the radius of the arc expressed by the end edges (inner end edges in the radial direction) closest to the center of gravity G2 in each engaging portion 31 is 1/2 of the width X of the engaging portion 31 from R It is the length (R-X/2) minus the length of .

In addition, as described above, when the path P2 is equidistant from the vertical axis L2, the central position of the entire coupling portion 31 included in the path P2 is at the same distance from the vertical axis L2. In addition, the case where the central position of the arbitrary coupling part 31 in the path P2 is different within 5% from the vertical axis L2 is also included.

(wait)

The weight 45 is for adjusting the center of gravity angle. The weight 45 can be attached to the weight attaching portion 30 formed in the head body 2 , in this case a plurality of engaging portions 31 . In the present embodiment, the weight 45 is configured to be fixed at an arbitrary position by being attached to different engaging portions 31 in the plurality of engaging portions 31 . The weight 45 has a main body portion 45a constituting the main body of the weight 45 and a second fixing portion 45b for fixing the main body portion 45a to any one coupling portion 31 .

The body portion 45a is formed to be inserted into the coupling portion 31 . A screw hole through which the second fixing portion 45b is screwed is formed in the main body portion 45a.

The 2nd fixing part 45b is formed by the screw (male thread) which can be screwed to the screw hole part 31c of the engaging part 31, for example. The second fixing portion 45b is formed so as to penetrate the screw hole of the body portion 45a while screwing it. This second fixing portion 45b is formed so that the weight 45 is fixed to any one engagement portion 31 by screwing it into the screw hole 31c of the engaging portion 31 .

As in the first embodiment, it is preferable that the density of the weight 45 is greater than that of the head body 2 . In this way, since the density of the weight 45 is greater than the density of the head body 2, the amount of change in the center of gravity angle when the attachment position of the weight 45 is changed can be made larger. Even when the amount of change in the center of gravity angle is large as described above, since a plurality of attachment positions of the weight 45 are on the path P2, it is possible to suppress a change in the moment of inertia due to a change in the attachment position.

(second filling member)

The golf club head 20 further includes a second filling member filled in the coupling part 31 to which the weight 45 is not attached among the plurality of coupling parts 31, and the mass of the second filling member is It is preferably smaller than the mass of the weight 45 . In addition, it is preferable that the specific gravity of the second filling member is equal to or less than that of the head body 2 . For example, as a forming material of such a 2nd filling member, when the forming material of the head main body 2 is titanium, resin, magnesium, aluminum etc. other than titanium are mentioned, for example.

When the second filling member is filled in the region where the weight 45 is not attached in the plurality of engaging portions 31, it is possible to suppress entry of sand, dust, etc. into the engaging portion 31 from the external environment. Further, since the second filling material is lighter than the weight 45 , the influence of the second filling material on the moment of inertia can be reduced.

The size of the plurality of coupling portions 31, the dimension such as the depth, the quantity, the interval, etc. are not particularly limited and are appropriately set. For example, they may be appropriately set so that a desired amount of change of the center of gravity angle is obtained.

<Adjustment of the center of gravity angle>

As in the case of the first embodiment described above, the center of gravity angle can be changed by changing the attachment position of the weight 45 in the weight attachment portion 30 .

In the present embodiment, the weight 45 is inserted into any one engaging portion 31 of the plurality of engaging portions 31 , and the second fixing portion 45b of the weight 45 is connected to the engaging portion 31 . ), the weight 45 can be attached to the coupling part 31 by screwing it into the screw hole 31c. Since the position of the center of gravity of the golf club head 20 (center of gravity after attaching the weight 45) is changed (not shown) from the state shown in Fig. 3 described above according to this attachment position, this change Accordingly, the center of gravity angle θ is changed.

On the other hand, by holding the screw insertion of the second fixing part 45b from the state in which the weight 45 is attached in this way, the fixing of the weight 45 is released, and the weight 45 is detached and movable. The weight 45 is fixed again by inserting the weight 45 into an arbitrary engaging portion 31 at an attachment position different from the past attachment position, and screwing the second fixing portion 45b. According to the change of the attachment position of the weight 45, the position of the center of gravity of the golf club head 20 (the center of gravity of the golf club head in the state where the weight 45 is attached) is changed, and according to this change, the position of the center of gravity of the golf club head 20 is changed. The center of gravity angle θ is changed.

In the present embodiment, the attachment position of the weight 45 to the plurality of engaging portions 31 is at an equidistant (radius R) from the vertical axis L2 passing through the center of gravity G2, thereby changing the center of gravity angle θ. When the attachment position of the weight 45 is changed, the change in the moment of inertia can be reduced.

Also in this embodiment, as in the above-described first embodiment, the weight 45 is attached to any attachment position in the weight attachment portion 30 (here, the plurality of engagement portions 31), and the shaft As the lower limit of the moment of inertia around the vertical axis L2 passing through the center of gravity G2 of the head body 2 in a state where 50 is fixed at a lie angle of 60°, 5500 g·cm2 is preferable, and 5700 g·cm2 is It is more preferable, and 5800 g*cm<2> is still more preferable. When the moment of inertia does not satisfy the lower limit, the fall of the flying distance during an off-center hit increases, and as a result, there is a risk that the head body 2 is weak against a miss shot. On the other hand, the larger the moment of inertia, the better, and the upper limit is not particularly limited. The upper limit of this moment of inertia may be limited by, for example, a tool rule or the like. In such a case, the upper limit of the moment of inertia may be appropriately set according to a tool rule or the like. For example, in the case where the upper limit of the moment of inertia is set at 5900+100 g·cm 2 (that is, 6000 g·cm 2 ) by the tool rule, the upper limit of the moment of inertia is 6000 g·cm 2 according to the tool rule in order to conform to the tool rule. It can be set in cm2.

Also in this embodiment, similarly to the first embodiment described above, the difference between the maximum value and the minimum value of the moment of inertia when the attachment position is changed is preferably within 5% of the minimum value, more preferably within 3%, , more preferably within 2%. When the difference exceeds the above range, an attachment location having a smaller moment of inertia occurs among a plurality of attachment locations, and when the weight 45 is attached to this attachment location, the drop of the flying distance during off-center hit increases, As a result, there is a possibility that the head body 2 is weak against a miss shot.

<Advantage>

The golf club head 20 has a weight ( 45), the change in the moment of inertia before and after the change can be reduced. Accordingly, the golf club head 20 can adjust the trajectory of the batted ball to approximate the trajectory intended by the player.

[Sixth embodiment]

<Golf Club>

The golf club of this embodiment is provided with the shaft 50 and the said golf club head 20 mentioned above. The shaft 50 is not particularly limited, and a conventionally known shaft 50 can be employed. The golf club head 20 is as described above. Therefore, the detailed description of the golf club of this embodiment is abbreviate|omitted.

<Advantage>

Since the golf club of the present embodiment includes the golf club head 20, the trajectory of the batted ball can be adjusted so as to approximate the trajectory intended by the player as described above.

[Seventh Embodiment]

6 shows a golf club head 20' according to another embodiment of the present invention. The golf club head 20 ′ has a head body 2 attachable to a shaft 50 (see FIG. 1 ) and a plurality of attachment locations formed on the head body 2 for attaching a weight 45 . and a weight attachment part 30 having The golf club head 20 ′ further includes a weight 45 . The golf club head 20' further includes a second filling member (not shown).

In the golf club head 20' of the present embodiment, the weight attachment portion 30 is formed on the sole portion 4 of the head body 2 . The configuration other than that is the same as that of the above-described fifth embodiment. Accordingly, a detailed description of the golf club head 20' is omitted.

<Advantage>

The golf club head 20' has the weight 45 to change the center of gravity angle θ such that the attachment position of the weight 45 is equidistant (here, the radius R) from the vertical axis L2 passing through the center of gravity G2. When the attachment position of (45) is changed, the change in the moment of inertia before and after the change can be reduced. Accordingly, the golf club head 2O' can be adjusted so that the trajectory of the batted ball is in close contact with the trajectory intended by the player.

[Eighth embodiment]

<Golf Club>

The golf club of this embodiment is provided with the shaft 50 and the said golf club head 20' mentioned above. The shaft 50 is not particularly limited, and a conventionally known shaft 50 can be employed. The golf club head 20' is as described above. Therefore, the detailed description of the golf club of this embodiment is abbreviate|omitted.

<Advantage>

Since the golf club of this embodiment is provided with the golf club head 20', as described above, the trajectory of the batted ball can be adjusted so as to approximate the trajectory intended by the player.

[Other embodiments]

The above embodiments do not limit the configuration of the present invention. Accordingly, in the above embodiment, it is possible to omit, substitute, or add components of each part of the above embodiment based on the description and technical common sense of the present specification, and they should all be construed as belonging to the scope of the present invention.

For example, in the first to fourth embodiments, the weight 40 is connected to the rail portion 11 by engagement of each engagement groove 13 of the rail portion 11 and each engagement piece portion 40b of the weight 40 . ) has been described, but the method for movably attaching the weight 40 to the rail 11 is not particularly limited to the above embodiment. In addition, the fixing method of the weight 40 to the arbitrary attachment position of the rail part 11 is not specifically limited, either.

For example, in the above fifth to eighth embodiments, the case of using the screw engagement between the screw hole portion 31c and the second fixing portion 45b as the engagement portion 31 and the weight 45 has been described. The method of coupling the coupling part 31 and the weight 45 is not specifically limited to the said embodiment.

Although the case where the golf club head is attached to the shaft has been described in the first embodiment, the golf club head may be attached to the shaft, and may be in a state before attachment.

(industrial applicability)

The golf club head and golf club according to the present invention can adjust the trajectory of the batted ball to approximate the trajectory intended by the player. Therefore, they can be suitably used as various golf club heads and golf clubs excellent in operability.

1, 1', 20, 20': golf club head 2: head body
3: face part 4: sole part
5: Crown part 6: Shaft hole
7: hosel part 10, 30: weight attachment part
11: rail part 11a: bottom part
11b: side part 13: coupling groove
31: coupling portion 31a: bottom portion
31b: side part 31c: screw hole part
40, 45: weight 40a: body part
40b: coupling piece portion 40c: first fixing portion
45a: body portion 45b: second fixing portion
50: shaft
G1, G2: Center of gravity of the head body when no weight is attached
L2, L2: vertical axis P1, P2: path
S: central axis of shaft R: distance (radius)
θ: center of gravity angle

Claims (6)

a head body attachable to the shaft;
A golf club head formed on the head body and having a weight attachment portion having a plurality of attachment positions capable of attaching weights, the golf club head comprising:
A golf club head in which the plurality of attachment locations are on a path equidistant from a vertical axis through the center of gravity of the head body with the shaft fixed at a lie angle of 60°. The method of claim 1,
The weight attachment part is capable of guiding the weight and has a rail part extending on the path,
A golf club head configured such that the weight is movably coupled to the rail portion and is fixed at an arbitrary position of the rail portion. The method of claim 1,
The weight attachment part is engageable with the weight, and has a plurality of coupling parts disposed at a distance from each other on the path,
A golf club head configured to engage the weight with any of the plurality of engagement portions. 4. The method according to any one of claims 1 to 3,
A moment of inertia around a vertical axis passing through the center of gravity of the head body in a state where the weight is attached to an arbitrary attachment position in the weight attachment portion and the shaft is fixed at a lie angle of 60° is 5500 g · A golf club head of more than one square centimeter. 4. The method according to any one of claims 1 to 3,
A golf club head wherein a difference between a maximum value and a minimum value of the moment of inertia when the attachment position is changed is within 5% of the minimum value. A golf club comprising: a shaft; a golf club head attachable to the shaft; and a weight attachable to the golf club head;
The golf club head,
a head body attachable to the shaft;
a weight attachment portion formed on the head body and having a plurality of attachment positions capable of attaching the weight;
wherein the plurality of attachment locations are on a path equidistant from a vertical axis passing through the center of gravity of the head body with the shaft fixed at a lie angle of 60°.

Images