JP2015023985A - Golf club - Google Patents

Abstract

Provided is a golf club excellent in adjustment convenience.
A golf club 52 includes a shaft 56, a head 54 having a hosel, a sleeve 58 fixed to a front end portion of the shaft 56, a grip 60 fixed to a rear end portion of the shaft 56, and the sleeve 58. And a coupling member 10 that can be coupled to each other. A shaft 56 is removably attached to the head 54. The shaft 56 has an exposed portion Ex. The sleeve 58 can be fixed to the head 54 at a plurality of circumferential fixing positions. The three-dimensional angle of the shaft 56 with respect to the head 54 changes due to the circumferential fixed position of the sleeve 58. The head 54 has a head marking Hm. The exposed portion Ex has a shaft marking Sm for confirming the circumferentially fixed position.
[Selection] Figure 11

Description

  The present invention relates to a golf club.

  Golf clubs having adjustability have been proposed. This adjustability facilitates fitting.

  US 2013/0017901 and US 7980959 disclose a golf club having a shaft removably attached to a head. In these golf clubs, a sleeve is attached to the tip of the shaft, and a shaft hole provided in the sleeve is inclined. In these golf clubs, the loft angle, lie angle, and face angle can be adjusted depending on the circumferentially fixed position of the sleeve.

US Patent Publication US2013 / 0017901 US Patent Publication US79980959

  From the viewpoint of convenience, it is preferable that the adjustment situation can be easily understood. An object of the present invention is to provide a golf club excellent in adjustment convenience.

  A preferred golf club includes a shaft, a head having a hosel, a sleeve fixed to the front end portion of the shaft, a grip fixed to the rear end portion of the shaft, and a coupling member that can be coupled to the sleeve. I have. The shaft is detachably attached to the head. The sleeve can be fixed to the head at a plurality of circumferential fixing positions. The three-dimensional angle of the shaft relative to the head varies due to the circumferential fixed position of the sleeve. The shaft has an exposed portion exposed to the outside. The exposed portion has a shaft marking for confirming the circumferentially fixed position.

  Preferably, the head has a head marking. Preferably, the head marking is disposed on the hosel. Preferably, the shaft marking is disposed at a tip portion of the exposed portion.

  Preferably, the grip has a grip marking for confirming the circumferential direction fixed position.

  Preferably, the grip marking is disposed at a tip portion of the grip.

  Preferably, the shaft marking is formed after the sleeve is fixed to the shaft.

  Preferably, the shaft marking is formed after the sleeve fixed to the shaft is attached to the head.

  Preferably, the shaft marking is formed by a laser.

  Another preferred golf club includes a shaft, a head having a hosel, a sleeve fixed to the tip end portion of the shaft, a grip fixed to the rear end portion of the shaft, and a coupling member that can be coupled to the sleeve. It is equipped with. The shaft is detachably attached to the head. The sleeve can be fixed to the head at a plurality of circumferential fixing positions. The three-dimensional angle of the shaft relative to the head may vary due to the circumferential fixed position of the sleeve. The shaft has an exposed portion exposed to the outside. The exposed portion has a shaft marking. The head has a head marking. The head marking is disposed on the hosel. The shaft marking is disposed at the tip of the exposed portion.

  Preferably, the color of the shaft marking varies depending on the viewing angle. The color when the shaft marking is viewed from the angle of the standard address viewpoint is SR1, the color when the shaft marking is viewed from the front is SR2, and the color of the shaft around the shaft marking is SR3, The color difference between SR1 and SR3 is ΔEa, and the color difference between SR2 and SR3 is ΔEb. Preferably, ΔEa is smaller than ΔEb.

  A golf club excellent in adjustment convenience can be obtained.

FIG. 1 is a view showing a golf club according to the first embodiment. FIG. 1 shows only the vicinity of the head. FIG. 2 is an exploded view of FIG. FIG. 3 is a cross-sectional view of FIG. FIG. 4 is a perspective view showing an example of a sleeve. FIG. 5 is a bottom view of the sleeve of FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. FIG. 8 is a cross-sectional view taken along line F8-F8 in FIG. FIG. 9 is a side view of the golf club of FIG. 1 viewed from the heel side. In FIG. 9, the sole is on the upper side. FIG. 10 is a view showing a golf club according to the second embodiment. FIG. 11 is a side view of the golf club of FIG. 10 viewed from the heel side. Similar to FIG. 9, in FIG. 11, the sole is on the upper side. FIG. 12 is a development view of shaft marking (and / or grip marking) according to a modification.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  Unless otherwise specified, the “circumferential direction” in the present application means the circumferential direction of the shaft. Unless otherwise specified, the “axial direction” in the present application means the axial direction of the shaft.

  FIG. 1 shows a golf club 2 according to a first embodiment of the present invention. FIG. 1 shows only the vicinity of the head of the golf club 2. FIG. 2 is an exploded view of the golf club 2. FIG. 3 is a cross-sectional view of the golf club 2. FIG. 3 is a sectional view taken along the central axis of the sleeve 8.

  The golf club 2 includes a head 4, a shaft 6, a sleeve 8, a grip (not shown), a screw 10, and a ferrule 12. A sleeve 8 is fixed to the tip of the shaft 6. A grip (not shown) is attached to the rear end of the shaft 6.

  The head 4 has a head main body 14 and an engaging member 16. The head body 14 has a hosel 17. The hosel 17 has a hosel hole 18 for inserting the sleeve 8.

  The head main body 14 has a through hole 19 through which the screw 10 is inserted. The through hole 19 passes through the bottom of the hosel hole 18. The head body 14 has a sole opening 20 (see FIG. 3). The sole opening 20 and the hosel hole 18 are continuous by the through hole 19. The head body 14 has a hollow portion.

  The type of the head 4 is not limited. The head 4 of this embodiment is a wood type golf club. The head 4 may be a utility type head, a hybrid type head, an iron type head, a putter head, or the like.

  The shaft 6 is not limited, and a general-purpose carbon shaft or steel shaft can be used. The shaft 6 of this embodiment is a carbon shaft.

  The shaft 6 has an exposed portion Ex and a non-exposed portion Ey (see FIG. 3). The exposed portion Ex is exposed to the outside. The exposed part Ex can be visually recognized from the outside. The non-exposed portion Ey is not exposed to the outside. The unexposed portion Ey is covered with the sleeve 8, the ferrule 12, or the grip.

  The screw 10 has a head portion 22 and a shaft portion 24 (see FIG. 2). The screw 10 passes through the through hole 19 from the sole opening 20 and reaches a screw hole 32 (described later). The screw 10 is screwed to the sleeve 8. The head 22 has a rotation recess 26 (see FIG. 3). By using a tool suitable for the recess 26, the screw 10 positioned inside the head main body 14 can be rotated. By this shaft rotation, the sleeve 8 can be attached and detached. The screw 10 is an example of a coupling member that can be coupled to the sleeve 8. This connection is a mechanical connection.

  The engaging member 16 is fixed to the head body 14 (see FIG. 3). The fixing method is not limited, and examples thereof include adhesion, welding, fitting, and a combination thereof. The engaging member 16 is inserted into the hosel hole 18 from the upper opening of the hosel hole 18. The engaging member 16 is fixed to the bottom of the hosel hole 18.

  The engaging member 16 has a rotation preventing part. The rotation preventing portion is formed on the inner surface of the engagement member 16. This rotation prevention unit will be described later.

  FIG. 4 is a perspective view of the sleeve 8. FIG. 5 is a bottom view of the sleeve 8. 6 is a cross-sectional view taken along line VI-VI in FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.

  The sleeve 8 has a shaft hole 30 and a screw hole 32 (FIGS. 6 and 7). The shaft hole 30 is open to one side (upper side). The screw hole 32 opens to the other side (lower side). A screw hole 32 is disposed below the shaft hole 30.

  Further, the sleeve 8 includes a circumferential surface 34, an inclined surface 35, an exposed surface 36, and a rotation preventing unit 38. The circumferential surface 34 is a portion having a constant outer diameter. A stepped surface 39 exists at the lower end of the exposed surface 36.

  FIGS. 1 and 3 show an attached state in which the shaft 6 is attached to the head 4. In this attached state, the exposed surface 36 is exposed to the outside. The outer diameter of the lower end of the exposed surface 36 is substantially equal to the outer diameter of the hosel end surface 37. The outer diameter of the upper end of the exposed surface 36 is substantially equal to the outer diameter of the lower end of the ferrule 12. The exposed surface 36 and the ferrule 12 as a whole look like a general ferrule. The exposed surface 36 improves the appearance.

  A portion of the sleeve 8 below the exposed surface 36 is inserted into the hosel hole 18 (see FIG. 3). The shape of the inclined surface 35 corresponds to the shape of the chamfered portion 41 of the hosel hole 18.

  As shown in FIG. 6, the axis h <b> 1 of the shaft hole 30 is inclined with respect to the axis z <b> 1 of the outer surface of the sleeve 8. Accordingly, the axis s1 of the shaft 6 is inclined with respect to the axis z1. The axis line e1 of the hosel hole 18 coincides with the axis line z1. The axis s1 of the shaft 6 is inclined with respect to the axis e1 of the hosel hole 18.

  In FIG. 6, what is indicated by a double arrow θ1 is an angle formed by the axis e1 and the axis s1. From the viewpoint of appropriate adjustability, the inclination angle θ1 is preferably not less than 0.5 ° (degree) and not more than 2 °.

  The tip of the shaft 6 is fixed to the shaft hole 30. This fixing is achieved by bonding with an adhesive. The outer surface of the shaft 6 is bonded to the inner surface of the shaft hole 30. Fixing may be achieved by means other than adhesion.

  The sleeve 8 is prevented from coming off by screw connection. As shown in FIG. 3, the screw hole 32 of the sleeve 8 is screwed to the screw 10. This screw connection prevents the sleeve 8 from coming off. The axial force resulting from this screw connection is balanced with the pressure between the hosel end surface 37 and the step surface 39. In order to secure this axial force, a gap K1 exists between the tip of the screw 10 and the bottom surface of the screw hole 32 in the state where the screw coupling is completed (see FIG. 3).

  As shown in FIGS. 4 and 5, the rotation preventing portion 38 of the sleeve 8 has a plurality of convex portions t2. The rotation preventing part 38 has twelve convex parts t2. The plurality of convex portions t2 are equally arranged in the circumferential direction. In the present embodiment, the plurality of convex portions t2 are arranged every 30 °.

  The rotation preventing unit 38 has rotational symmetry with the axis line z1 as a rotational symmetry axis. Rotational symmetry means that the shape before rotation is coincident when rotated (360 / W) degrees around the rotational symmetry axis. However, W is an integer of 2 or more. Matching with the shape before the rotation when rotating about the rotational symmetry axis (360 / W) is also referred to as “W-fold rotational symmetry”. The rotation preventing unit 38 of the present embodiment is 12-fold rotationally symmetric with respect to the axis line z1.

  FIG. 8 is a cross-sectional view taken along line F8-F8 in FIG.

  The outer surface of the engaging member 16 is a circumferential surface having a constant outer diameter. On the other hand, an anti-rotation portion 48 is provided inside the engagement member 16. The rotation prevention unit 48 has twelve recesses r2. These recesses r2 are arranged at equal intervals in the circumferential direction. The engaging member 16 may be integrally formed with the head main body 14.

  The rotation prevention unit 48 has rotational symmetry with the axis line z1 as a rotational symmetry axis. The rotation prevention unit 48 is 12-fold rotationally symmetric with respect to the axis line z1. The shape of the rotation prevention unit 48 corresponds to the shape of the rotation prevention unit 38.

  Restriction of the relative rotation between the sleeve 8 and the hosel hole 18 is achieved by the engagement between the rotation preventing portion 38 and the rotation preventing portion 48. The rotation prevention unit 38 and the rotation prevention unit 48 are engaged. By this engagement, the relative rotation between the head 4 and the shaft 6 is restricted. The rotation of the sleeve 8 with respect to the head 4 is restricted by the engagement between the rotation prevention unit 48 and the rotation prevention unit 38. The shaft 6 does not rotate with respect to the head 4 by the impact.

  The sleeve 8 can be fixed at a plurality of circumferential fixing positions. In the present embodiment, the sleeve 8 has 12 circumferentially fixed positions. In other words, there are 12 circumferential relative positions at which the rotation preventing portion 38 and the rotation preventing portion 48 can be engaged. When the circumferential fixed position of the sleeve 8 changes due to the inclination angle θ1, the three-dimensional angle of the shaft 6 with respect to the head 4 changes. The loft angle, lie angle, and hook angle change due to the change in the three-dimensional angle.

  Examples of the number of circumferentially fixed positions of the sleeve 8 include twelve, four, five, six, eight and the like. From the viewpoint of enhancing adjustability, the number of circumferentially fixed positions of the sleeve 8 is preferably 4 or more, and more preferably 8 or more. From the viewpoint of preventing the shape of the rotation preventing portion from becoming complicated, the number of circumferentially fixed positions of the sleeve 8 is preferably 24 or less, and more preferably 20 or less.

  FIG. 9 is a side view of the golf club 2 as seen from the heel side. In FIG. 9, the sole of the golf club 2 is the upper side.

  As described above, the sleeve 8 can be fixed to the head 4 at a plurality of circumferentially fixed positions. The three-dimensional angle of the shaft 6 with respect to the head 4 changes due to the circumferential fixed position of the sleeve 8. Due to the change in the three-dimensional angle, the real loft angle, the lie angle, and the face angle change. Thus, the golf club 2 has an angle adjustment function that can adjust the real loft angle, the lie angle, and the face angle.

  As shown in FIG. 9, the head 4 has a head marking Hm. The head marking Hm is provided on the hosel 17. The head marking Hm is provided on the outer peripheral surface of the hosel 17. The head marking Hm is provided at one place in the circumferential direction. The head marking Hm may be provided at a plurality of locations in the circumferential direction.

  In the present embodiment, the head marking Hm is an asterisk. The shape of the head marking Hm is not limited. The head marking Hm can be visually recognized.

  As shown in FIG. 9, the shaft 6 has a shaft marking Sm. The shaft marking Sm is provided to confirm the circumferential fixed position Pv of the sleeve 8.

  The shaft marking Sm is provided on the surface of the shaft 6. The shaft marking Sm is provided at the tip of the exposed portion Ex. The shaft marking Sm is provided at one place in the circumferential direction. The shaft marking Sm may be provided at a plurality of locations in the circumferential direction.

  In the present embodiment, the shaft marking Sm is a line. The shape of the shaft marking Sm is not limited. The shaft marking Sm can be visually recognized.

  When the sleeve 8 is in at least one of the circumferential fixing positions, the relative position between the head marking Hm and the shaft marking Sm can be visually confirmed. As FIG. 9 shows, both the head marking Hm and the shaft marking Sm can be visually recognized from one viewpoint. Therefore, the relative position of the head marking Hm and the shaft marking Sm is confirmed.

  In the following, the circumferential position of the sleeve 8 is Pv. In the following, the circumferential position of the head marking Hm is Ph. Hereinafter, the circumferential position of the shaft marking Sm is Ps. In the following, the circumferential position of the grip marking Gm (described later) is Pg.

  In the state of FIG. 9, the circumferential position Ph of the head marking Hm and the circumferential position Ps of the shaft marking Sm coincide. Preferably, there is a circumferential fixed position Pv of the sleeve 8 such that the circumferential position Ph coincides with the circumferential position Ps. In the present embodiment, the circumferential fixed position Pv is 12. At one of the circumferential fixed positions Pv, the circumferential position Ph coincides with the circumferential position Ps.

  The circumferential fixed position Pv of the sleeve 8 can be easily determined based on the relative position between the head marking Hm and the shaft marking Sm. Therefore, the real loft angle, the lie angle, and the face angle can be easily adjusted.

  FIG. 10 shows a golf club 52 of the second embodiment. The golf club 52 includes a head 54, a shaft 56, a sleeve 58, a grip 60, a screw (not shown), and a ferrule 62.

  The head 54 is the same as the head 4 described above. The head 54 has a head marking Hm. The head marking Hm is provided for determining the circumferential fixed position Pv of the sleeve 58. The shaft 56 is the same as the shaft 6 described above. The shaft 56 has a shaft marking Sm. The shaft marking Sm is provided to determine the circumferential fixed position Pv of the sleeve 58. The sleeve 58 is the same as the sleeve 8 described above. The screw (not shown) is the same as the screw 10 described above. The ferrule 62 is the same as the ferrule 12 described above.

  FIG. 11 is a side view of the golf club 52 as seen from the heel side. The grip 60 has a grip marking Gm. The grip marking Gm is provided in order to confirm the circumferential fixed position Pv of the sleeve 8. The grip marking Gm is provided on the surface of the grip 60. The grip marking Gm can be visually recognized from the outside. The grip marking Gm is provided at one place in the circumferential direction. The grip marking Gm may be provided at a plurality of locations in the circumferential direction.

  In the present embodiment, the grip marking Gm is a line. The shape of the grip marking Gm is not limited. The grip marking Gm can be visually recognized. The grip marking Gm is provided for determining the circumferential fixed position Pv of the sleeve 58.

  In the present embodiment, the circumferential position Pg of the grip marking Gm is the same as the circumferential position Ps of the shaft marking Sm. Therefore, it is easy to grasp the circumferential fixed position Pv of the sleeve 58. The circumferential position Pg may be different from the circumferential position Ps.

  The shaft marking Sm may be arranged at a position where it is difficult to see from the golfer at the address. In the state shown in FIG. 11, the shaft marking Sm is located on the back side as viewed from the golfer at the address. The circumferential fixing position Pv of the sleeve includes a circumferential position where the shaft marking Sm is not visible to the golfer at the address. At this circumferential position, the golfer who holds and addresses the golf club 52 cannot see the shaft marking Sm. The shaft marking Sm does not unduly hinder the golfer's concentration at the address.

  The head marking Hm may be arranged at a position where it is difficult to see from the golfer at the address. As shown in FIG. 11, the head marking Hm is located on the back side as viewed from the golfer at the address. The head marking Hm is arranged at a position where it cannot be seen from the golfer at the address. A golfer who holds and addresses the golf club 52 cannot see the head marking Hm. Therefore, the head marking Hm does not hinder the concentration of the golfer at the address.

  The grip marking Gm may be arranged at a position where it is difficult to see from the golfer at the address. In the state shown in FIG. 11, the grip marking Gm is located on the back side as viewed from the golfer at the address. The circumferential fixing position Pv of the sleeve includes a circumferential position where the grip marking Gm is not visible to the golfer at the address. At this circumferential position, the golfer who holds and addresses the golf club 52 cannot see the grip marking Gm. Therefore, the grip marking Gm does not excessively inhibit the golfer's concentration at the address.

  Whether the marking is visible to the golfer at the address is determined by the following determination method. In this determination method, the club is set to the reference state, and the standard address viewpoint is set. The determination is made by viewing the club in the reference state from the standard address viewpoint. The above determination can be made by an image of a camera in which the center of the lens is set at the standard address viewpoint.

  In the reference state, the golf club is placed on the horizontal plane HP at a specified lie angle. The shaft axis s1 is arranged in a plane VP perpendicular to the horizontal plane HP. The shaft 6 is supported such that the lie angle is maintained, the shaft 6 is movable in the direction of the axis s1, and is rotatable about the axis s1. The sole is grounded to the horizontal plane HP so that the head 4 is most stable while maintaining the support of the shaft 6. The state in which the head 4 is most stable is the reference state. In the club in this reference state, a position 60 cm above the grip end in the vertical direction is defined as a standard address viewpoint.

[Axial position of shaft marking Sm]
In FIG. 11, a double arrow D <b> 1 indicates the axial distance between the exposed end of the sleeve 58 and the shaft marking Sm. The exposed end of the sleeve 58 is the end of the portion exposed in the assembled state. This exposed end is the end of the sleeve 58 on the grip 60 side.

  From the standpoint that the relative position with respect to the head marking Hm can be easily determined, the shaft marking Sm is preferably disposed in the vicinity of the exposed end of the sleeve 58. This “neighborhood” means that the D1 is 15 cm or less.

  From the viewpoint that the relative position with respect to the head marking Hm can be easily determined, the distance D1 is preferably 15 cm or less, more preferably 13 cm or less, more preferably 10 cm or less, more preferably 5 cm or less, and more preferably 3 cm or less. Preferably, 1 cm or less is more preferable. The distance D1 may be 0 cm.

  In FIG. 11, a double arrow D5 indicates the axial distance between the tip of the exposed portion Ex of the shaft 56 and the shaft marking Sm. From the viewpoint that the relative position with respect to the head marking Hm can be easily determined, the distance D5 is preferably 10 cm or less, more preferably 8 cm or less, more preferably 7 cm or less, more preferably 5 cm or less, and more preferably 3 cm or less. Preferably, 1 cm or less is more preferable, and 0.5 cm is more preferable. In the embodiment of FIG. 11, the distance D5 is 0 cm.

  From the viewpoint that the relative position with respect to the head marking Hm can be easily determined, the shaft marking Sm is preferably disposed at the tip of the exposed portion Ex. When the distance D5 is 10 cm or less, it is determined that the shaft marking Sm is disposed at the tip of the exposed portion Ex.

[Axial position of head marking Hm]
In FIG. 11, a double arrow D2 indicates the axial distance between the hosel end face and the head marking Hm. From the viewpoint that the relative position to the shaft marking Sm can be easily determined, the distance D2 is preferably 3 cm or less, more preferably 2 cm or less, and more preferably 1 cm or less. The distance D2 may be 0 cm.

[Axial position of grip marking Gm]
In FIG. 11, the double arrow D3 indicates the axial distance between the tip 66 of the grip 60 and the grip marking Gm. The tip 66 is an end surface on the head side. From the viewpoint that the circumferential fixed position Pv can be easily determined, the distance D3 is preferably 3 cm or less, more preferably 2 cm or less, and more preferably 1 cm or less. The distance D3 may be 0 cm. In the embodiment of FIG. 11, the distance D3 is 0 cm. In other words, the grip marking Gm is in contact with the tip 66.

  From the viewpoint that the determination of the circumferential fixed position Pv can be facilitated, the grip marking Gm is preferably disposed at the tip of the grip 60. When the distance D3 is 3 cm or less, it is determined that the grip marking Gm is disposed at the tip of the grip 60.

  In FIG. 11, a double arrow D4 indicates an axial distance between the head marking Hm and the shaft marking Sm. From the viewpoint that the positional relationship between the marking Hm and the marking Sm can be easily determined, the distance D4 is preferably 20 cm or less, more preferably 15 cm or less, preferably 10 cm or less, more preferably 5 cm or less, and more preferably 3 cm or less. preferable. Considering the presence of the ferrule and the sleeve, the distance D4 is preferably 0.5 cm or more.

[Method of forming shaft marking Sm]
The method for forming the shaft marking Sm is not limited. If it can be recognized visually, it can function as the shaft marking Sm. The shaft marking Sm may be a two-dimensional display or a three-dimensional display. As the three-dimensional display, a concave portion (including a groove) and a convex portion are exemplified. The three-dimensional display may be formed by the shaft itself, or may be formed by a display member attached to the shaft. Examples of the display member include a seal attached to the shaft. Examples of the method for forming a two-dimensional display include a method using a laser, ink jet printing, painting, and screen printing.

An example of a preferred shaft marking Sm is formed by a laser. In this method, the shaft marking Sm is formed by laser irradiation. For example, a commercially available laser marker can be used. The marking can be formed easily, accurately and quickly by the laser. This laser method can be easily applied to an assembled club, for example. Therefore, the method using this laser is suitable for the following (a) and (b).
(A) After the sleeve is fixed to the shaft, the shaft marking Sm is formed.
(B) After the sleeve fixed to the shaft is attached to the head, the shaft marking Sm is formed.

  In the case of (a), since the shaft marking Sm is attached after the sleeve is fixed, the relative position of the shaft marking Sm with respect to the sleeve is set with high accuracy.

  In the case of (b), since the shaft marking Sm is given after the shaft is fixed to the head, the relative position of the shaft marking Sm with respect to the head and the sleeve is set with high accuracy.

  The shaft marking Sm may be printed by inkjet. Commercially available inkjet printers can be used.

[Method of forming head marking Hm]
The method for forming the head marking Hm is not limited. Any device that can be recognized visually can function as the head marking Hm. The head marking Hm may be a two-dimensional display or a three-dimensional display. Examples of the three-dimensional display include concave portions (including grooves), through holes, and convex portions. An example of this three-dimensional display is a notch provided on the end face of the hosel. The three-dimensional display may be formed by the head itself or may be formed by a display member attached to the head. Examples of the display member include a seal attached to the head. Examples of the method for forming a two-dimensional display include a method using a laser, ink jet printing, painting, and screen printing.

As a preferable method for forming the head marking Hm, a method using a laser is exemplified. In this method, the head marking Hm is formed by laser irradiation. For example, a commercially available laser marker can be used. The marking can be formed easily, accurately and quickly by the laser. This laser method can be easily applied to an assembled club, for example. Therefore, the method using this laser is suitable for the following (c).
(C) After the sleeve having the shaft is fixed to the head, the head marking Hm is formed.

  In the case of (c), since the head marking Hm is attached after the shaft is fixed to the head, the relative position of the head marking Hm with respect to the shaft and the sleeve is set with high accuracy.

  The head marking Hm may be printed by inkjet. Commercially available inkjet printers can be used.

[Formation method of grip marking Gm]
The formation method of the grip marking Gm is not limited. If it can be recognized visually, it can function as the grip marking Gm. The grip marking Gm may be a two-dimensional display or a three-dimensional display. Examples of the three-dimensional display include concave portions (including grooves), through holes, and convex portions. An example of this three-dimensional display is a groove provided on the grip surface. A paint may be disposed inside the groove. The three-dimensional display may be formed by the grip itself or may be formed by a display member attached to the grip. Examples of the method for forming a two-dimensional display include a method using a laser, ink jet printing, painting, and screen printing.

  The grip marking Gm may be formed depending on the material. For example, in a grip formed of rubber, the grip marking Gm may be formed by changing the color of the rubber.

From the viewpoint of adapting the circumferential position of the grip marking Gm to the circumferential position of the shaft marking Sm, the following method (d) or (e) may be employed.
(D) After the grip having the grip marking Gm is fixed to the shaft, the shaft marking Sm is formed.
(E) The grip having the grip marking Gm is attached to the shaft having the shaft marking Sm. In this mounting, the relative position between the grip marking Gm and the shaft marking Sm is adjusted.

  In the cases (d) and (e), the relative position of the shaft marking Sm with respect to the grip marking Gm is set with high accuracy.

[Comparison between markings]

  The shape may be the same or different between the shaft marking Sm and the head marking Hm. In the embodiment of FIG. 11, both shapes are different. That is, in this embodiment, the head marking Hm is a star shape, and the shaft marking Sm is a rectangle. When the two shapes are different, the markings can be easily distinguished from each other. When both shapes are the same, the relative position of both may be easily determined.

  The shape may be the same or different between the shaft marking Sm and the grip marking Gm. In the embodiment of FIG. 11, both shapes are the same. That is, in this embodiment, the grip marking Gm is rectangular and the shaft marking Sm is also rectangular. Thus, when both are the same, it is easy to understand that both are markings for determining the circumferential fixed position Pv.

  The axial length may be the same or different between the shaft marking Sm and the head marking Hm. In the embodiment of FIG. 11, these axial lengths are different. That is, as shown in FIG. 11, the axial length LH of the head marking Hm is different from the axial length LS of the shaft marking Sm. When the length LH and the length LS are different, it is easy to distinguish between markings.

  In the embodiment of FIG. 11, the length LS is greater than the length LH. When the circumferential fixing position Pv of the sleeve is changed, the circumferential position Ps of the shaft marking Sm moves. By making the length LS larger than the length LH, the movement of the circumferential position Ps can be easily determined. Therefore, the circumferential fixed position Pv can be easily grasped.

  The axial length between the shaft marking Sm and the grip marking Gm may be the same or different. In the embodiment of FIG. 11, these axial lengths are the same. That is, as shown in FIG. 11, the axial length LG of the grip marking Gm is the same as the axial length LS. When the length LG and the length LS are the same, it is easy to understand that both are markings for determining the circumferential fixed position Pv.

  The length LS may be greater than the length LG, and the length LG may be greater than the length LH. Due to the large LS, the circumferential position Ps of the shaft can be easily determined. In the address, the grip marking Gm is closer to the golfer's eyes than the shaft marking Sm. Therefore, when the length LG is excessive, the grip marking Gm may be too conspicuous at the time of addressing. By making the length LG smaller than the length LS, the grip marking Gm is not easily noticeable at the time of addressing.

  The area of the shaft marking Sm is As, the area of the head marking Hm is Ah, and the area of the grip marking Gm is Ag. From the viewpoint that the circumferential position Ps of the shaft can be easily determined, the area As is preferably larger than the area Ah. From the same viewpoint, the area As may be larger than the area Ag.

  The shaft marking Sm and the head marking Hm may be the same color. In this case, it is easy to determine the relative position between the marking Sm and the marking Hm. In the present application, “same color” means that the color difference ΔE is 10 or less, and more preferably, ΔE is 3 or less.

The color difference ΔE is calculated based on the following mathematical formula.
ΔE = ((ΔL ^* ) ² + (Δa ^* ) ² + (Δb ^* ) ² ) ^1/2
In this equation, ΔL ^* is the difference in lightness index L ^* between the first color and the second color. In this equation, Δa ^* is a difference between the first color index a ^* and the second color index a ^* . In this equation, Δb ^* is the difference between the first color index b ^* and the second color index b ^* . L ^* , a ^* and b ^* are indices in the CIELAB display system. The indices L ^* , a ^* and b ^* are calculated by the following mathematical formulas.
L ^* = 116 (Y / Yn) ¹ / 3-16
a ^* = 500 ((X / Xn) ¹ /3-(Y / Yn) ^1/3 )
b ^* = 200 ((Y / Yn) ¹ /3-(Z / Zn) ^1/3 )
In these mathematical formulas, X, Y, and Z are tristimulus values in the XYZ display system, and Xn, Yn, and Zn are tristimulus values on the perfect diffuse reflection surface. The CIELAB display system is a standard determined in 1976 by the International Commission on Illumination (CIE). In Japan, the CIELAB display system is adopted in “JIS Z 8729”. L ^* is a lightness index. a ^* and b ^* are indices that correlate with hue and saturation. The negative direction of a ^* is the green direction, and the positive direction is the red direction. The negative direction of b ^* is the blue direction, and the positive direction is the yellow direction. The index is measured by a color difference meter “CM-3500d” manufactured by Konica Minolta. The light receiving unit is applied to the surface of the object, and measurement is performed. “Standard light D ₆₅ ” is adopted as the light source. The color temperature of this light source is 6504k. As the spectral sensitivity, “2 ° field of view” is adopted. As the hole diameter, 8 mm is adopted.

  FIG. 12 shows a shaft marking Sm according to a modification. FIG. 12 is a development view. Actually, twelve scales of the shaft marking Sm are evenly arranged in the circumferential direction of the shaft.

  The shaft marking Sm includes a display that can determine the state of the angle adjustment function. In the present embodiment, the letter “N” means “NEUTRAL”. In the present embodiment, the letter “R” means “RIGHT”. This “R” means that the face angle is adjusted to the rightmost. This “R” means that the hit ball tends to go right. In the present embodiment, the letter “L” means “LEFT”. This “L” means that the face angle is adjusted to the leftmost. In other words, this “L” means that the hit ball tends to go to the left. In the present embodiment, the character “NU” means “NEUTRAL UPRIGHT”. This “NU” means that the face angle is neutral and the lie angle is maximum. The state of the angle adjustment function can be determined based on the relative positions of these characters and the head marking Hm.

  Similarly, the grip marking Gm may include a display that can determine the state of the angle adjustment function. Similarly, the head marking Hm may include a display that can determine the state of the angle adjustment function. For example, the grip marking Gm may be displayed as shown in FIG.

  The color of the shaft marking Sm may change depending on the viewing angle. Based on this color change, it is preferable that the color when viewed from the angle X of the standard address viewpoint is less noticeable than the color when viewed from the front (angle 90 °). In this case, the shaft marking Sm is not conspicuous in the address, and the circumferential fixed position Pv can be easily confirmed. From this viewpoint, the following (S1) is preferable.

  (S1) The color when the shaft marking Sm is viewed from the standard address viewpoint angle X is SR1, the color when the shaft marking Sm is viewed from the front is SR2, and the color of the shaft around the shaft marking Sm is When the color difference between SR1 and SR3 is ΔEa and the color difference between SR2 and SR3 is ΔEb, ΔEa is smaller than ΔEb. The color difference is calculated by the method described above.

  When there are a plurality of circumferential fixed positions Pv, a plurality of the angles X can exist. In this case, preferably, (S1) is satisfied at at least one angle X. More preferably, the above (S1) is satisfied at all the angles X.

  For the formation of such a shaft marking Sm, for example, a paint whose color changes depending on the viewing angle is used. An example of this paint is a polarizing paint. Preferred polarizing paints include pigment flakes having multiple layers. An example of this polarizing paint is “Majora” (registered trademark) manufactured by Nippon Paint Co., Ltd.

  The color of the grip marking Gm may change depending on the viewing angle. Based on this color change, it is preferable that the color when viewed from the angle Y of the standard address viewpoint is less noticeable than the color when viewed from the front (angle 90 °). In this case, the grip marking Gm is not conspicuous at the address, and the circumferential fixed position Pv can be easily confirmed. From this viewpoint, the following (G1) is preferable.

  (G1) The color when the grip marking Gm is viewed from the angle Y of the standard address viewpoint is GR1, the color when the grip marking Gm is viewed from the front is GR2, and the color of the grip around the grip marking Gm is When the color difference between GR1 and GR3 is ΔEc and the color difference between GR2 and GR3 is ΔEd, ΔEc is smaller than ΔEd.

  When there are a plurality of circumferential fixed positions Pv, a plurality of the angles Y can exist. In this case, preferably, (G1) is satisfied at at least one angle Y. More preferably, the above (G1) is satisfied at all the angles Y.

  For example, a paint whose color changes depending on the viewing angle is used to form the grip marking Gm. An example of this paint is a polarizing paint. Preferred polarizing paints include pigment flakes having multiple layers. An example of this polarizing paint is “Majora” (registered trademark) manufactured by Nippon Paint Co., Ltd.

  The color of the head marking Hm may change depending on the viewing angle. Based on this color change, it is preferable that the color viewed from the angle Z of the standard address viewpoint is less noticeable than the color viewed from the front (angle 90 °). In this case, the head marking Hm is not conspicuous at the address, and the circumferential fixed position Pv can be easily confirmed. From this viewpoint, the following (H1) is preferable.

  (H1) The color when the head marking Hm is viewed from the angle Z of the standard address viewpoint is HR1, the color when the head marking Hm is viewed from the front is HR2, and the color of the head around the head marking Hm is When the color difference between HR1 and HR3 is ΔEe and the color difference between HR2 and HR3 is ΔEf, ΔEe is smaller than ΔEf.

  For forming the head marking Hm, for example, a paint whose color changes depending on the viewing angle is used. An example of this paint is a polarizing paint. Preferred polarizing paints include pigment flakes having multiple layers. An example of this polarizing paint is “Majora” (registered trademark) manufactured by Nippon Paint Co., Ltd.

  As described above, the shaft marking Sm preferably has a viewpoint effect. The viewpoint effect means that the visibility when viewed from the angle of the standard address viewpoint is lower than the visibility when viewed from the front. In the above (S1), this viewpoint effect is achieved by color. This viewpoint effect may be achieved by the shape. For example, the circumferential width of the shaft marking Sm may be reduced as it approaches the sleeve. An example of such a shaft marking Sm is a shaft marking Sm having a tapered shape and a tip thereof pointing to the sleeve side.

  As described above, the grip marking Gm preferably has a viewpoint effect. In (G1) above, this viewpoint effect is achieved by color. This viewpoint effect may be achieved by the shape. For example, the circumferential width of the grip marking Gm may be reduced as it approaches the tip 66 of the grip 60. An example of such a grip marking Gm is a grip marking Gm having a tapered shape and a tip thereof pointing to the sleeve side.

  As described above, the head marking Hm preferably has a viewpoint effect. In (H1) above, this viewpoint effect is achieved by color. This viewpoint effect may be achieved by the shape. For example, the circumferential width of the head marking Hm may be reduced as it approaches the sole. An example of such a head marking Hm is a head marking Hm having a tapered shape and a tip thereof pointing to the sole side.

  Hereinafter, the effects of the present invention will be clarified by examples. However, the present invention should not be construed in a limited manner based on the description of the examples.

  As an example, a golf club shown in FIG. 11 was produced.

  The rubber raw material was pressurized and heated by a known method to obtain a grip molded body. This grip molded body had a groove for grip marking. The grip marking Gm was formed by arranging the paint inside the groove. As shown in FIG. 11, the grip marking Gm was a line extending from the end face of the grip toward the grip end.

  The same sleeve as the sleeve 8 was prepared. In this sleeve, the angle θ1 was 1.0 °. This sleeve was fixed to the tip of a commercially available carbon shaft. This fixation was achieved by gluing with an adhesive. A shaft with a sleeve was obtained by this adhesion.

  A commercially available titanium alloy head was prepared. A head marking Hm was formed on this head. The head marking Hm was formed by painting. The shaft with sleeve was fixed to this head by screw connection, and an assembled club was obtained. In this club, the sleeve could be fixed at a plurality (12) of circumferential fixing positions.

  A shaft marking Sm was formed on this assembled golf club. This shaft marking Sm was formed by a laser. As shown in FIG. 11, the shaft marking Sm was formed at a position in contact with the ferrule. The shaft marking Sm was formed while confirming the relative position with respect to the head marking Hm. The shaft marking Sm was formed at the same circumferential position as the head marking Hm. Next, the grip was attached. The grip was attached while confirming the relative position between the shaft marking Sm and the grip marking Gm. The circumferential position was consistent between the shaft marking Sm and the grip marking Gm.

  In this club, the circumferential positions of the shaft marking Sm and the grip marking Gm changed with the change in the circumferential fixing position of the sleeve.

  FIG. 11 shows a state in which the circumferential position is matched between the shaft marking Sm and the head marking Hm. In this embodiment, the face angle and the real loft angle are neutral when the circumferential position is the same between the shaft marking Sm and the head marking Hm. The face angle is neutral means that the face angle is the median value in the adjustment range. The real loft angle being neutral means that the real loft angle is the median value in the adjustment range.

  In this embodiment, the lie angle is the minimum value in the adjustment width when the circumferential position matches between the shaft marking Sm and the head marking Hm.

  In this example, since the shaft marking Sm was formed after the assembly, the positional relationship between the marking Hm and the marking Sm was accurate. In this example, since the grip was mounted while checking the relative position between the shaft marking Sm and the grip marking Gm, the positional relationship between the marking Sm and the marking Gm was accurate.

  The invention described above can be applied to any golf club.

2, 52 ... Golf club 4, 54 ... Head 6, 56 ... Shaft 8, 58 ... Sleeve 10 ... Screw 12 ... Feral 14 ... Head body 16 ... Joint member 18 ... Hosel hole 19 ... Through hole 20 ... Sole hole 30 ... Shaft hole 32 ... Screw hole 36 ... Exposed surface of sleeve 60 ... Grip Ex ... Shaft Exposed part Hm ... Head marking Sm ... Shaft marking Gm ... Grip marking

Claims (9)

A shaft, a head having a hosel, a sleeve fixed to the tip of the shaft, a grip fixed to the rear end of the shaft, and a coupling member that can be coupled to the sleeve,
The shaft is removably attached to the head;
The sleeve can be fixed to the head at a plurality of circumferentially fixed positions;
The three-dimensional angle of the shaft relative to the head changes due to the circumferentially fixed position of the sleeve;
The shaft has an exposed portion exposed to the outside;
The golf club in which the exposed portion has a shaft marking for confirming the circumferentially fixed position. The head has a head marking,
The head marking is arranged on the hosel,
The golf club according to claim 1, wherein the shaft marking is disposed at a tip portion of the exposed portion.   The golf club according to claim 1, wherein the grip has a grip marking for confirming the circumferentially fixed position.   The golf club according to claim 3, wherein the grip marking is disposed at a tip portion of the grip.   The golf club according to claim 1, wherein the shaft marking is formed after the sleeve is fixed to the shaft.   The golf club according to claim 1, wherein the shaft marking is formed after the sleeve fixed to the shaft is attached to the head.   The golf club according to claim 1, wherein the shaft marking is formed by a laser. A shaft, a head having a hosel, a sleeve fixed to the tip of the shaft, a grip fixed to the rear end of the shaft, and a coupling member that can be coupled to the sleeve,
The shaft is removably attached to the head;
The sleeve can be fixed to the head at a plurality of circumferentially fixed positions;
The three-dimensional angle of the shaft relative to the head changes due to the circumferentially fixed position of the sleeve;
The shaft has an exposed portion exposed to the outside;
The exposed portion has a shaft marking,
The head has a head marking,
The head marking is arranged on the hosel,
A golf club in which the shaft marking is disposed at a tip portion of the exposed portion. The color of the shaft marking changes depending on the viewing angle,
The color when the shaft marking is viewed from the angle of the standard address viewpoint is SR1, the color when the shaft marking is viewed from the front is SR2, and the color of the shaft around the shaft marking is SR3. 9. The color difference between SR1 and SR3 is ΔEa, and when the color difference between SR2 and SR3 is ΔEb, ΔEa is smaller than ΔEb. Golf club.

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