JP6252129B2 - Golf club shaft, method for adjusting length thereof, and golf club - Google Patents

Description

  The present invention relates to a golf club shaft made of fiber reinforced resin, and more particularly to a golf club shaft whose length can be adjusted. The present invention also relates to a method for adjusting the length of the golf club shaft. Furthermore, the present invention relates to a golf club having this golf club shaft.

  Golf club shafts are roughly classified into so-called steel shafts and carbon shafts. Carbon shafts are widely used from the viewpoint of light weight and high design freedom.

  The carbon shaft is made of a fiber reinforced resin whose main fiber is carbon fiber (carbon fiber). As a method for producing this carbon shaft, a sheet winding method is known. In this manufacturing method, a sheet-like prepreg is wound around a mandrel (core metal), a wrapping tape is wound around, the prepreg is cured by heating, and then the mandrel is pulled out to form a hollow tubular shaft having an inner hole. Is manufactured.

  Patent Documents 1 and 2 disclose golf club shafts that can be adjusted in length. Japanese Patent Application Laid-Open No. H10-228561 describes a shaft that is composed of an inner shaft and a cylindrical outer shaft that is externally fitted to the inner shaft, and the outer shaft can be fixed to the inner shaft by a screw cap. In Patent Document 1, in order to prevent the outer shaft from rotating around the cylinder axis, a guide tube portion with a longitudinal groove is fitted on the inner shaft, and a convex portion is provided on the inner peripheral surface of the outer shaft. Yes. By engaging the convex portion with the longitudinal groove, the mutual rotation of the inner shaft and the outer shaft is prevented.

  However, with this structure, it is difficult to form minute protrusions on the inner peripheral surface of the outer shaft with high shape accuracy, and it is almost impossible to apply to a carbon shaft.

  Patent Document 2 discloses an adjustable golf club shaft in which a square bar-like body is integrally provided on the proximal side (upper end side) of the shaft, a grip member is inserted into the square bar-like body, and the pin is secured by a pin. Is described. However, in the golf club shaft of Patent Document 2, the square bar-like body is thinner than the main body portion of the shaft, and the deflection of the shaft concentrates on the hand side and exhibits unusual characteristics. Further, when the grip member is shallowly inserted so as to increase the shaft length, the square bar-like body becomes completely visible, and the appearance is remarkably inferior. Furthermore, such a square rod-shaped shaft violates the golf regulations.

JP-A-60-90578 JP-A-4-327865

  The present invention is a golf club shaft in which an extension member is attached to a shaft main body so that the fixing position can be adjusted, and the rotation of the extension member with respect to the shaft main body is reliably prevented, and the appearance is improved even if the length is adjusted. An object of the present invention is to provide a fiber reinforced resin golf club shaft having a good aesthetic appearance, a method for adjusting the length thereof, and a golf club having the golf club shaft.

  The golf club shaft of the present invention is a golf club shaft having a shaft main body and an extension member fitted on the rear end side of the shaft main body, and the shaft main body has a diameter toward the front end side. In the golf club shaft provided with a taper portion that becomes smaller, the extension member is provided with a taper portion having a smaller diameter toward the tip side on the tip side, and the extension member has a taper portion on the tip side of the taper portion of the extension member. An inner peripheral surface is engaged with an outer peripheral surface of the tapered portion of the shaft main body, and a polygonal portion is provided on the inner peripheral surface on the rear end side of the extending member and the outer peripheral surface of the rear end portion of the shaft main body. These polygonal portions are engaged with each other.

  The extending member preferably includes a straight portion having a cylindrical outer peripheral surface and a tapered portion that is continuous with a tip side of the straight portion and has an inner diameter and an outer diameter that decrease toward the tip side. It is preferable that an end cap is detachably attached to the rear end of the extension member.

  One aspect of the method of adjusting the length of the golf club shaft of the present invention is characterized in that the length of the golf club shaft is changed by replacing the extension member with one having a different length. When the end cap is detachably attached to the rear end of the extension member, it is preferable to remove the end cap and insert and remove the extension member from the front end side of the shaft body. Moreover, it is preferable to attach an end cap to the extension member after replacement of the extension member.

  Another aspect of the golf club shaft length adjusting method according to the present invention is characterized in that the length of the golf club shaft is changed by changing the locking position of the extension member to the shaft body. In this case, a taper-shaped stopper having a slit is interposed between the outer peripheral surface of the tapered portion of the shaft main body and the inner peripheral surface on the distal end side of the extension member, and the position of the stopper is changed for extension. You may make it change the latching position to the shaft main body of a member.

  The golf club of the present invention includes the golf club shaft of the present invention and a golf club head having the tip of the golf club shaft attached to a hosel portion.

  The golf club shaft of the present invention has a shaft body and an extending member that is externally fitted to the rear end side of the shaft body. A polygonal portion such as a hexagonal portion is provided on the rear end side of the extension member and the rear end portion of the shaft body, and the extension member is firmly prevented from rotating by engaging the polygonal portions. . The position of the extending member in the axial direction is fixed by engaging the tapered portion on the distal end side of the extending member with the tapered portion on the distal end side of the shaft body.

  In one aspect of the present invention, the length of the golf club shaft is changed by replacing the extension member with one having a different length. When the end cap is detachably attached to the rear end of the extension member, the extension member can be easily replaced by removing the end cap.

  In another aspect of the present invention, the length of the golf club shaft is adjusted by changing the axial position of the extending member. In this case, the length of the golf club shaft can be arbitrarily adjusted by arbitrarily changing the position of the extending member by interposing a slotted stopper between the extending member and the shaft body. .

It is a lineblock diagram of a golf club shaft concerning a 1st embodiment. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is length adjustment explanatory drawing of the golf club shaft which concerns on 1st Embodiment. It is length adjustment explanatory drawing of the golf club shaft which concerns on 2nd Embodiment. It is length adjustment explanatory drawing of the golf club shaft which concerns on 3rd Embodiment. It is length adjustment explanatory drawing of the golf club shaft which concerns on 4th Embodiment. It is an assembly explanatory view of a golf club shaft. It is a partial sectional view of a golf club.

  Hereinafter, embodiments will be described with reference to the drawings. In each figure, the shaft body and the extension member are illustrated with the longitudinal dimension shortened compared to the radial dimension.

[First Embodiment]
1 to 6 show the configuration of a golf club shaft according to a first embodiment of the present invention, and FIGS. 1 to 5 and FIGS. 6 (a) and 6 (b) are elongated golf clubs. The shaft is shown. 6 (c) and 6 (d) show a golf club shaft having a medium length, and FIGS. 6 (e) and 6 (f) show a golf club shaft having a short length.

  FIG. 1 (a) is an exploded side view of a golf club shaft (hereinafter sometimes simply referred to as a shaft), FIG. 1 (b) is a sectional view thereof, and FIG. 1 (c) is an extension member assembled to a shaft body. It is sectional drawing of the shaft at the time. 2 to 5 are sectional views taken along line II-II to VV in FIG. 6 (a) and 6 (b) are cross-sectional views of a long extension member and a golf club shaft equipped with the extension member. 6 (c) and 6 (d) are cross-sectional views of a medium length extension member and a golf club shaft equipped with the extension member. FIGS. 6E and 6F are sectional views of a short extension member and a golf club shaft equipped with the extension member.

  The golf club shaft 1 includes a shaft body 2 and an extension member 3 that is externally fitted to the shaft body 2. The shaft body 2 and the extending member 3 are both made of fiber reinforced resin. As the fiber, carbon fiber is used as the main fiber, and other fibers such as alumina fiber and glass fiber may be blended as necessary. An epoxy resin or the like is used as the matrix resin, but is not limited thereto. Since at least a part of the extension member 3 overlaps the shaft body 2, it is desirable that the rigidity of the extension member 3 is not excessively high. Therefore, the fiber used for the extension member 3 should have a rigidity equal to or lower than that of the fiber used for the shaft body 2.

  In order to manufacture the shaft body 2 and the extension member 3, a release agent is applied to the surface of each mandrel, and then a sheet-like prepreg is wound. Next, after wrapping the wrapping tape in a spiral shape, a curing process by heating is performed. Next, the mandrel is pulled out and the wrapping tape is removed to obtain a cured tubular body (element tube). Both ends of the raw tube are cut as necessary, and then polished to obtain the shaft body 2 or the extension member 3.

  The shaft body 2 has a large diameter on the grip side and a small diameter on the head side. Further, the grip end side of the shaft body 2 is a hexagonal portion 2a, which sequentially becomes a transition portion 2b, a first straight portion 2c, a tapered portion 2d, and a second straight portion 2e toward the head side. As shown in FIG. 3, the inner surface of the hexagonal portion 2a is also hexagonal.

  The straight portions 2c and 2e and the tapered portion 2d have a circular cross section both on the inner surface and the outer surface. The transition part 2b has a cross-sectional shape that gradually becomes circular from the hexagonal part 2a to the straight part 2c. The straight part 2c is thinner than the hexagonal part 2a, and the transition part 2b is gradually thinner from the hexagonal part 2a side to the straight part 2c side.

  In the shaft main body 2, since the grip end side has a hexagonal portion 2a having an inner hole of hexagonal shape, mechanical strength such as buckling strength, impact strength, and bending strength on the grip side is high. By changing the length of the hexagonal portion 2a in the longitudinal direction of the shaft, it is possible to manufacture the shaft body 2 in which the elastic modulus, weight balance, tone, and the like are variously changed.

  In the shaft body 2, a transition portion 2b is provided between the hexagonal portion 2a and the straight portion 2c, and the cross-sectional area gradually decreases from the hexagonal portion 2a to the straight portion 2c. For this reason, it is prevented that stress concentrates on the boundary part of the hexagonal part 2a and the straight part 2c.

  The long extending member 3 has a straight portion 3a and a tapered portion 3b. As shown in FIGS. 3 and 4, the outer peripheral surface of the straight portion 3 a is generally cylindrical. As for the internal peripheral surface of the straight part 3a, the rear part side (grip end side) is the hexagonal part 3c, and the front part side opposite to it is the cylindrical part 3d. The taper portion 3b has a tapered shape on both the inner surface and the outer surface, and has a circular cross-sectional shape. The hexagonal portion 3 c has a dimension that fits snugly into the hexagonal portion 2 a of the shaft body 2.

The taper angle θ (FIG. 1B) of the inner hole of the taper portion 3 b of the extension member 3 is larger than the taper angle of the taper portion 2 d of the shaft body 2. Inside diameter d ₁ of the distal end side of the tapered portion 3b is slightly smaller than the outer diameter of the straight portion 2c of the shaft body 2 is greater than the outer diameter of the straight portion 2e.

6A, 6C, and 6E show the long extension member 3, the medium extension member 3A, and the short extension member 3B side by side. The medium length and short length extension members 3A and 3B also have a straight portion 3a and a tapered portion 3b. The shape and length m ₁ of the straight portion 3a of the extending members 3A and 3B are the same as those of the long extending member 3. The taper portion 3b of the extension members 3A and 3B has the same taper angle θ as the taper portion 3b of the long extension member 3, but the length is larger than that of the long extension member 3. Extension member 3, 3A, _p 1 the length of the tapered portion 3b of _{3B, p 2,} p _3, if the inner diameter of the distal end side of the taper portion 3b was _{d 1, d 2, d 3} , p 1 < p ₂ <p ₃ and d ₁ > d ₂ > d ₃ .

6 (b), 6 (d) and 6 (f) show a golf club shaft in which the extension member 3, 3A or 3B shown in FIGS. 6 (a), 6 (c) and 6 (e) is attached to the common shaft body 2. FIG. 1, 1A and 1B are shown. The extension members 3, 3 </ b> A, 3 </ b> B are engaged with the hexagonal portion 2 a of the shaft body 2 at the hexagonal portion 3 c, and the inner peripheral edge at the tip side of the extension members 3, 3 </ b> A, 3 </ b> B The shaft body 2 is externally fitted so as to be engaged. Since the distal end side inner diameters of the extending members 3, 3A, 3B are in the relationship of d ₁ > d ₂ > d ₃ , the protruding length of the extending members 3, 3A, 3B from the rear end of the shaft body 2 is as shown in FIG. 6B, the golf club shaft 1A of FIG. 6D is the next longest, and in the golf club shaft 1B of FIG. 6F, the extending member 3B is the rear end of the shaft body 2. No or almost no protrusion. As a result, the lengths L ₁ , L ₂ , and L ₃ of the golf club shafts 1, 1 A, and 1 B satisfy L ₁ > L ₂ > L ₃ as shown in FIGS. 6 (b), (d), and (f).

  As described above, golf clubs having different lengths are prepared by preparing three types of extension members 3, 3 </ b> A, 3 </ b> B for one shaft body 2 and attaching the desired extension members to the shaft body 2. The shaft 1, 1A or 1B can be configured. In any of the golf club shafts 1, 1A, 1B, the hexagonal portion 3c of the extending members 3, 3A, 3B is engaged with the hexagonal portion 2a of the shaft body 2, and the extending members 3, 3A, 3B Fixed rigidity in the rotational direction is extremely high.

  It should be noted that a rubber or elastomer lining may be provided on at least the inner peripheral surface of the extension members 3, 3A, 3B to prevent the extension member from sliding in the longitudinal direction of the shaft. The same applies to each extension member described later.

[Second Embodiment]
FIG. 7 shows a golf club shaft according to the second embodiment. FIGS. 7A, 7C, and 7E are cross-sectional views of the extension members 3, 3C, and 3D, and FIG. ) Is a cross-sectional view of the golf club shaft 1 in which the extension member 3 of FIG. 7A is attached to the shaft body 2, and FIG. 7D is an extension member 3C of FIG. FIG. 7F is a sectional view of the golf club shaft 1C, and FIG. 7F is a sectional view of the golf club shaft 1D in which the extending member 3D of FIG.

The extension member 3 in FIGS. 7A and 7B is the same as the extension member 3 in the above embodiment. Extension member 3C, 3D of the straight portion 3a has the same sectional shape as the extension member 3 in any of the inner peripheral surface and outer peripheral surface thereof, the length of the length m ₁ and the tapered portion 3b of the straight portion 3a p _{1 is} also the same in each of the extending members 3, 3C, 3D.

In the extension member 3C, the taper angle of the taper portion 3b is larger than that of the extension member 3, and the taper angle of the extension member 3D is further larger than the taper angle of the extension member 3C. As a result, the inner diameters d ₁ , d ₄ , d ₅ on the distal end side of the extension members 3, 3 C, 3 D have a relationship of d ₁ > d ₄ > d ₅ .

The other configurations of the extension members 3C and 3D in FIG. 7 and the configuration of the shaft body 2 are the same as those in the above embodiment. In this embodiment, the locking position of the extension member 3, 3C, 3D in the order of the extension member 3, 3C, 3D on the shaft taper portion 2d is the shaft tip side, and the shaft body 2 in the order of the extension members 3, 3C, 3D. The projecting length from the rear end is reduced, and the relationship between the total lengths L ₁ , L ₄ , and L ₅ of the golf club shafts ₁ , ₁ C, and ₁ D is L ₁ > L ₄ > L ₅ .

[Third Embodiment]
FIG. 8 shows a golf club shaft according to the third embodiment. FIGS. 8A, 8C, and 8E are cross-sectional views of the extension members 3, 3E, and 3F, and FIG. ) Is a cross-sectional view of the golf club shaft 1 with the extension member 3 of FIG. 8A attached to the shaft body 2, and FIG. 8D shows the extension member 3E of FIG. A cross-sectional view of the golf club shaft 1C, and FIG. 8F is a cross-sectional view of the golf club shaft 1D in which the extension member 3F of FIG.

The extension member 3 in FIGS. 8A and 8B is the same as the extension member 3 in the above embodiment. The straight portions 3a of the extending members 3E and 3F have the same cross-sectional shape as the extending member 3 on both the inner peripheral surface and the outer peripheral surface, but the lengths m ₁ , m ₂ and m _{3 of the} straight portions 3a are The extension members 3, 3E, 3F are shortened in this order. That is, m ₁ > m ₂ > m ₃ . Extension member 3,3E, 3F is any length _{p 1} and the taper angle of the taper portion 3b is the same, the extension member 3,3E, and all the leading end side of the inner diameter of 3F is a _{d 1.}

The other configurations of the extension members 3C and 3D in FIG. 8 and the configuration of the shaft body 2 are the same as those in the above embodiment. In this embodiment, the total length of the extension members decreases in the order of the extension members 3, 3E, 3F. Each extension member 3,3E, since the distal end side inner diameter _{d 1} of 3F are identical, each extension member 3,3E, the locking position to 3F distal end side of the shaft taper portion 2d is the same. For this reason, the protruding length from the rear end of the shaft body 2 becomes smaller in the order of the extending members 3, 3E, 3F, and the relationship between the total lengths L ₁ , L ₆ , L ₇ of the golf club shafts ₁ , 1E, 1F is L ₁ > L ₆ > L ₇

[Fourth Embodiment]
In each of the above-described embodiments, all of the three types of extension members are used to adjust the overall length of the golf club shaft in three stages. FIGS. 9 (a), 9 (b), and 9 (c). In the fourth embodiment shown in FIG. 9, the stopper 5 shown in FIG. 9D is interposed between the shaft main body 2 and the extension member 3, and the locking position of the extension member 3 to the shaft main body 2 is arbitrary. It is possible to adjust to.

  The stopper 5 has a tapered cylindrical shape and has a slit 5a extending in the cylinder axial direction. The stopper 5 is made of fiber reinforced resin, but the material is not limited to this and may be made of metal or the like. It is preferable to apply an anti-slip lining made of rubber or elastomer on the inner peripheral surface of the stopper 5.

  The inner diameter on the distal end side of the stopper 5 in a state where no force is applied in the radial direction is equal to or smaller than the outer diameter on the rear side of the tapered portion 2d of the shaft body 2 and is larger than the outer diameter of the straight portion 2e. Since the slot 5a is provided, the width of the slot 5a can be increased or decreased in the arrow W direction. For this reason, the stopper 5 can be externally fitted to the tapered portion 2d of the shaft body 2 and can be disposed at an arbitrary position.

  The extension member 3 is attached to the shaft body 2 so that the inner peripheral surface on the distal end side is fitted to the stopper 5. Further, the hexagonal portion 3a of the extending member 3 and the hexagonal portion 2a of the shaft body 2 are engaged. The taper portion 3b of the extension member 3 fastens the stopper 5, whereby the stopper 5 is fixed so as to fasten the outer peripheral surface of the shaft body 2. Further, the extension member 3 is locked to the stopper 5.

  In the golf club shaft of this embodiment, not only the long state shown in FIG. 9A, the medium state shown in FIG. 9B, and the short state shown in FIG. It can be a length.

  7-9, since the hexagonal portion of the extension member and the hexagonal portion 2a of the shaft body 2 are engaged, the fixing member in the circumferential direction has high rigidity.

  In any of the golf club shafts shown in FIGS. 1 to 9, the shaft body 2 is composed of a taper portion having a larger diameter toward the straight portion and the rear end side, and a hexagonal portion having a large diameter at the rearmost portion. As shown in FIG. 2, the stress does not concentrate on the hand side and the hand side does not become remarkable. Also, the aesthetics are good.

  A grip member made of rubber or the like is attached to the extension member. The grip member is preferably attached to the extension member in advance, but the grip member may be attached to the extension member attached to the shaft body.

  An end cap is attached to the extension member to which the grip member is attached. FIG. 10A shows an example of the grip member and the end cap. The grip member 6 has a substantially cylindrical shape, and is attached to the outer periphery of the extension member 3 with an adhesive or an adhesive. The rear end of the grip member 6 slightly protrudes from the rear end of the extension member 3. The end cap 7 is fitted into the protruding portion. The end cap 7 is made of rubber, resin, or elastomer, and is closely fitted to the grip member 6. The end cap 7 is provided with a flange portion 7a. As shown in FIG. 10B, the flange portion 7 a of the end cap 7 abuts on the rear end surface of the grip member 6. In FIG. 10, the end cap 7 is attached to the grip member 6. However, for example, as shown in FIG. 11 described later, the end cap is similarly attached to other grip members.

  The golf club shaft of the present invention may be used so as to be directly fixed to the hosel hole of the golf club head by an adhesive, and an attachment is attached to the tip of the golf club shaft, and this attachment is attached to the golf club head. The attachment may be detachably fixed to the head with a bolt or the like.

  FIG. 10 shows an example of such an attachment. As shown in FIG. 10A, the attachment 8 has a hole 8a into which the tip of the shaft body 2 is inserted, a pyramid shaped portion 8b on the tip side, and a flange portion 8c on the rear end side. The tip of the shaft body 2 is inserted into the hole 8a and is fixed by an adhesive such as epoxy. A screw hole is provided in the distal end surface of the attachment 8.

The outer diameter of the flange 8c is smaller than the distal end side of the inner diameter of the extension member 3 (e.g., d ₁ in FIG. _1), as in FIG. 10 (b), the extension member 3 of the shaft body 2 past the attachment 8 It can move to the rear end side. As shown in FIG. 10B, after the extension member 3 is engaged with the rear end side of the shaft body 2, the grip member having the end cap 7 is attached to the extension member 3.

  As shown in FIG. 11, the back side of the hole of the hosel part 11 of the head 10 of the golf club is a pyramid-shaped part 12 with which the pyramid-shaped part 8b is engaged. The golf club shaft 1 is fixed to the head 10 by inserting the attachment 8 into the hosel portion 11, tightening the bolt 13 into the screw hole on the tip surface of the attachment 8, and pressing the flange portion 8 c against the upper end surface of the hosel portion 11. Note that a column 14 extends coaxially with the hosel portion 11 to the sole surface of the head 10. A partition wall portion 16 is provided above the inner hole 15 of the column 14. The bolt 13 is screwed into the screw hole of the attachment 8 through the opening of the partition wall portion 16. When the bolt 13 is removed, the golf club shaft 1 can be removed from the head 10, and the shaft can be replaced by attaching another shaft to the head 10. A ferrule 18 is attached to the shaft.

  If the axial center direction of the hole 8a is set obliquely with respect to the axial center direction of the attachment 8, the lie angle and face angle of the golf club can be adjusted by changing the phase in the circumferential direction of the shaft 1. When the axial center direction of the hole 8a is parallel to the axial center direction of the attachment 8, but the axial center position of the hole 8a is deviated from the axial center position of the attachment, the phase in the circumferential direction of the shaft 1 is changed. By changing, the progression of the golf club can be adjusted.

  Prior to mounting the shaft on the head, the extension member 3 is mounted on the shaft body 2.

  Further, as shown in FIG. 10, after the shaft 1 is removed from the head 10, the extension member 3 of the shaft body 2 can be replaced with another extension member.

  The above-described embodiment is an example of the present invention, and the present invention may be other than illustrated. For example, the hexagonal portion may be another polygon such as a pentagon and an octagon.

DESCRIPTION OF SYMBOLS 1,1A-1F Golf club shaft 2 Shaft main body 2a Hexagon part 2d Tapered part 3, 3A-3F Extension member 3a Straight part 3b Tapered part 3c Hexagon part 5 Stopper 5a Slot 6 Grip member 7 End cap 8 Attachment 10 Head 11 Hosel 13 Bolt

Claims (9)

A golf club shaft having a shaft body and an extension member fitted on the rear end side of the shaft body,
In the golf club shaft in which the shaft body is provided with a tapered portion whose diameter decreases toward the tip side,
The extending member is provided with a tapered portion having a smaller diameter on the distal end side, and an inner peripheral surface on the distal end side of the tapered portion of the extending member is an outer peripheral surface of the tapered portion of the shaft body. Is engaged with
Polygonal portions are provided on the inner peripheral surface on the rear end side of the extending member and on the outer peripheral surface of the rear end portion of the shaft body, and these polygonal portions are engaged with each other. Club shaft.   2. The extension member according to claim 1, wherein the extending member includes a straight portion having a cylindrical outer peripheral surface, and a taper portion that is continuous with a tip side of the straight portion and has an inner diameter and an outer diameter that are reduced toward the tip side. Golf club shaft characterized by A method for adjusting the length of a golf club shaft according to claim 1 or 2,
A method of adjusting a length of a golf club shaft, wherein the length of the golf club shaft is changed by exchanging the extension member with a member having a different length. 4. The end cap according to claim 3, wherein an end cap is detachably attached to the rear end of the extension member, and the end cap is removed when the extension member is detached from the shaft body and when the extension member is attached to the shaft body. The extension member is inserted and removed from the tip side of the shaft body,
A method for adjusting the length of a golf club shaft, comprising: attaching an end cap to the extension member after the extension member is attached to the shaft body. A method for adjusting the length of a golf club shaft according to claim 1 or 2,
A method of adjusting a length of a golf club shaft, wherein the length of the golf club shaft is changed by changing a locking position of the extension member to the shaft body. In claim 5, a tapered stopper having a slit is interposed between the outer peripheral surface of the tapered portion of the shaft body and the inner peripheral surface on the distal end side of the extending member,
A method for adjusting the length of a golf club shaft, characterized in that the position of the stopper is changed to change the locking position of the extension member to the shaft body.   3. A golf club having the golf club shaft according to claim 1 and a golf club head having a tip of the golf club shaft attached to a hosel portion.   8. The golf club according to claim 7, wherein an attachment is fixed to a tip of the golf club shaft, and the golf club shaft is detachably attached to the hosel portion via the attachment.   9. The end cap according to claim 7 or 8, wherein an end cap is detachably attached to a rear end of the extension member to which a grip member is attached, and the extension member is attached to the shaft body with the end cap removed. A golf club characterized by being inserted and removed.

Images