JP6074934B2 - Ferrule and golf club - Google Patents

Description

  The present invention relates to a ferrule used for a golf club. The present invention also relates to a golf club using a ferrule.

  In a golf club in which a shaft is inserted into a shaft insertion hole of a hosel portion of a golf club head and fixed by an adhesive, a ferrule is fitted on the shaft, and the ferrule is attached to the upper end of the hosel portion. This ferrule may be provided with an insertion portion that enters the upper end portion of the shaft insertion hole (Patent Documents 1 to 4). By providing this ferrule, the shear stress generated near the upper end portion of the shaft insertion hole of the shaft at the time of a ball hit is relieved. Further, by providing this ferrule, the beauty of the golf club is also improved.

  The ferrule is fixed to the hosel hole by an adhesive. When mounting the shaft in the shaft insertion hole of the golf club head, a ferrule is fitted on the shaft, an adhesive is applied to the tip of the shaft, the shaft is inserted into the shaft insertion hole, and then the ferrule is inserted into the hosel. Adhere to the part.

  FIG. 10 is an exploded sectional view of the vicinity of the hosel of the golf club disclosed in Patent Document 2. The shaft 3 is inserted into the shaft insertion hole 2 of the hosel portion 1 of the head, and the ferrule 4 is attached. The ferrule 4 has a tapered portion 4a and an insertion portion 4b protruding downward from the tapered portion 4a. Ferrule 4 is made of synthetic resin.

  In the shaft insertion hole 2, the upper portion 2 a is a large-diameter hole that receives the insertion portion 4 b, and the lower portion 2 b is a small-diameter hole that has substantially the same diameter as the shaft 3.

Utility model registration 2515800 JP 2000-42146 A JP-A-8-117364 JP-A-10-295856

  In the golf club having the conventional ferrule, since the insertion portion 4b is interposed between the inner peripheral edge of the uppermost portion 2t of the shaft insertion hole 2 and the shaft 3, the vicinity of the uppermost portion 2t of the shaft insertion hole 2 The shear stress generated in the shaft 3 is relaxed. However, the shear stress generated in the shaft 3 is large in the stepped portion at the boundary between the large diameter hole (upper part 2a) and the small diameter hole (lower part 2b), that is, in the vicinity of the uppermost part 2m of the small diameter hole.

  An object of the present invention is to provide a ferrule and a golf club in which shear stress generated in a shaft is small in the entire shaft insertion hole.

In the ferrule of the present invention, a shaft insertion hole passes therethrough, and a lower part is bonded to the hosel part, and the synthetic resin main body part having the shaft insertion hole is integrated with the main body part. A thin metal tube that is coaxial with the main body and protrudes downward from the main body, the metal tube is made of aluminum or an aluminum alloy, and the thickness of the metal tube is 0.1 to 0.3 mm. , and the is characterized in that the inner peripheral surface of the metal tube is in the inner circumferential surface of the shaft insertion hole of the main body and flush with each other.

  It is preferable that the upper end part of the metal tube is provided with an enlarged diameter part that expands in the radial direction.

  In the ferrule and golf club of the present invention, since a thin metal tube is interposed between the corner edge of the inner peripheral surface of the shaft insertion hole and the shaft, the shear stress generated in the shaft near the corner edge is reduced. Get smaller.

It is sectional drawing of the hosel vicinity of the golf club provided with the ferrule which concerns on embodiment. FIG. 2 is an exploded view of FIG. 1. FIG. 2 is an exploded perspective view of the vicinity of the hosel of the golf club in FIG. 1. It is sectional drawing of the hosel vicinity of the golf club provided with the ferrule which concerns on another embodiment. FIG. 5 is an exploded perspective view of the vicinity of the hosel of the golf club in FIG. 4. It is sectional drawing of the hosel vicinity of the golf club provided with the ferrule which concerns on different embodiment. FIG. 7 is an exploded view of FIG. 6. It is sectional drawing of the hosel vicinity of the golf club provided with the ferrule which concerns on another embodiment. FIG. 9 is a front view of the vicinity of the head of the golf club in FIG. 8. It is explanatory drawing which shows a prior art example.

  Hereinafter, embodiments will be described with reference to the drawings.

[Embodiment of FIGS. 1-3]
As shown in FIG. 1, a shaft insertion hole 12 is provided in a hosel portion 11 of a golf club head 10. At least the hosel portion 11 of the head 10 is made of a metal such as titanium alloy, soft iron, and stainless steel. The head 10 may be any of a wood shape, a utility shape, an iron shape, a putter shape, and the like.

The shaft insertion hole 12 has a large diameter portion 12a having the largest diameter on the inlet side, a middle diameter portion 12b having an intermediate diameter on the back side, and a small diameter portion 12c having the smallest diameter on the far side. A corner edge E ₁ on the inner peripheral side on the inlet side of the large diameter portion 12a, a corner edge E ₂ on the inner peripheral side on the inlet side of the medium diameter portion 12b, and a corner edge E ₃ on the inlet side of the small diameter portion 12c are: Although the cross-sectional shape of the hosel part 11 in the axial center line direction is a rounded shape, it may be a tapered shape having a larger diameter toward the inlet side.

  The ferrule 14 fitted on the shaft 13 includes a main body portion 15 made of synthetic resin and a metal tube 16 provided integrally with the main body portion 15 and coaxially. A shaft 13 is inserted through a shaft insertion hole 17 that passes through the ferrule 14.

  The main body 15 includes an upper truncated cone-shaped portion 15a and an annular insertion portion 15b protruding downward from the bottom surface of the truncated cone-shaped portion 15a. The shaft insertion hole 17 passes through the truncated cone shape portion 15a and the insertion portion 15b. The diameter (outer diameter) of the base of the truncated cone-shaped part 15 a is the same as the outer diameter of the hosel part 11. The outer diameter of the insertion part 15b is smaller than the large diameter part 12a and larger than the medium diameter part 12b.

  The metal tube 16 has a cylindrical shape, and a flange portion 16a that expands in the radial direction is provided as an enlarged diameter portion at an upper end thereof. In this embodiment, the metal tube 16 is made of aluminum or an aluminum alloy, and the thickness thereof is preferably 0.1 to 0.3 mm, particularly preferably 0.15 to 0.25 mm. The flange portion 16 a of the metal tube 16 is located in the middle of the truncated cone-shaped portion 15 a of the main body portion 15 in the vertical direction. The lower part of the metal tube 16 protrudes downward from the insertion part 15b.

  The inner peripheral surface of the metal tube 16 is flush with the inner peripheral surface of the shaft insertion hole 17 of the main body 15 other than the metal tube 16. The metal tube 16 is preferably integrated with the main body 15 by insert molding. By providing the flange portion 16a, the body portion 15 and the metal tube 16 are excellent in unity.

  In a state where the ferrule 14 is mounted on the hosel part 11 (FIG. 1), the metal tube 16 is inserted to the vicinity of the lower end of the medium diameter part 12b. The insertion part 15b is inserted only into the large diameter part 12a. The shaft 13 is inserted to the small diameter portion 12c.

  After the ferrule 14 is fitted through the shaft 13, the adhesive 18 is applied to the distal end side of the shaft 13 and the outer peripheral surface of the insertion portion 15 b and the metal tube 16, and the shaft 13 is inserted into the shaft insertion hole 12 and bonded. At the same time, the ferrule 14 is bonded to the hosel portion 13. The bottom surface of the truncated cone-shaped portion 15 a of the ferrule 14 is bonded to the upper end surface of the hosel portion 11. The inner peripheral surface of the shaft insertion hole 12 and the insertion portion 15 b, the metal tube 16, and the outer peripheral surface of the shaft 13 are bonded by an adhesive 18.

  As shown in FIG. 1, in the state where the shaft 13 and the ferrule 14 are mounted, the metal tube 16 is interposed between the medium diameter portion 12 b and the large diameter portion 12 a and the shaft 13.

Therefore, it becomes shear stress generated in the vicinity of the diameter 12b inlet side angle edge E ₂ in the shaft 13 is small. That is, if the case where the metal tube 16 is not present, the shearing force is applied to the shaft 13, the shear stress will be concentrated near the corner edge E _2. On the other hand, when the metal tube 16 made of aluminum or aluminum alloy is mounted, the shear stress is distributed over the entire area of the shaft 13 covered with the metal tube 16, and a large shear stress is locally generated. It is prevented from occurring. The metal tube 16 is made of thin aluminum or aluminum alloy, and the upper portion of the metal tube 16 is disposed in the ferrule body portion 15 made of synthetic resin. Therefore, the metal tube 16 is deformed following the deformation of the shaft 13 to some extent. Is possible. Therefore, the shear stress generated in the shaft 13 near the upper end of the metal tube 16 is also small.

[Embodiment of FIGS. 4 and 5]
In the present invention, the ferrule does not have to have the insertion portion. A ferrule 14A according to this example is shown in FIGS. FIG. 4 is a cross-sectional view of the hosel portion 11 on which the ferrule 14A is mounted, and shows a cross section of the same portion as that in FIG. FIG. 5 is an exploded view showing the same part as FIG.

  As shown in FIGS. 4 and 5, the main body portion of the ferrule 14 </ b> A consists only of the truncated cone-shaped portion 15 a and does not include the insertion portion 15 b. The large diameter portion 12 a of the shaft insertion hole 12 is filled with an adhesive 18. Other configurations are the same as those of the embodiment of FIGS. 1 to 3, and the same reference numerals denote the same parts.

  According to this embodiment, the same effect as the above embodiment can be obtained.

[Embodiment of FIGS. 6 and 7]
In the above embodiment, the metal tube 16 is integrated with the ferrule 14, but in the present invention, the metal tube 16 may be separate from the ferrule. An example of this is shown in FIGS.

  In this embodiment, as shown in FIG. 7, a metal tube 19 is mounted in advance on the hosel portion 11 of the golf club head 10A. The shaft insertion hole 12 of the hosel portion 11 has a large diameter portion 12a, a medium diameter portion 12b, and a small diameter portion 12c from the inlet side, and the metal tube 19 is forcibly fitted with an adhesive on the inner peripheral surface of the medium diameter portion 12b. It is bonded or fixed by shrink fitting or shrink fitting. The inner diameter of the metal tube 19 is the same as the inner diameter of the small diameter portion 12c. Ferrule 14B consists only of a truncated cone-shaped portion made of synthetic resin.

  As shown in FIG. 7, after the ferrule 14 </ b> B is fitted through the shaft 13, an adhesive is applied to the tip side of the shaft 13 and the bottom surface of the ferrule 14 </ b> B, the shaft 13 is inserted into the shaft insertion hole 12, Is bonded to the shaft insertion hole 12, and the ferrule 14 </ b> B is bonded to the upper end surface of the hosel portion 11. As shown in FIG. 6, an adhesive 18 is filled in the large diameter portion 12a.

Also in this embodiment, since the metal tube 19 is interposed between the corner edge E ₂ and the shaft 13 on the inlet side of the intermediate-diameter portion 12b, the shearing stress generated in the shaft 13 near the smaller. Further, in the large diameter portion 12a, the adhesive 18 exists between the metal tube 19 and the inner peripheral surface of the large diameter portion 12a, and the metal tube 19 can be deformed following the bending of the shaft 13 to some extent. The shear stress generated in the shaft 13 near the upper end of the metal tube 19 is also small.

[Embodiments of FIGS. 8 and 9]
In the above embodiment, the shaft 13 is inserted directly into the shaft insertion hole 12 of the hosel portion 11, but in the present invention, the tip of the shaft is inserted into the shaft case and fixed with an adhesive. In addition, the present invention can also be applied to a structure in which the shaft case is inserted into the hosel portion and the shaft case is fixed to the head with bolts. An example of such a head is shown in FIGS. 9 is a front view of the vicinity of the head of the golf club, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

  In this golf club, a shaft 24 is attached to a hosel portion 23 of a head 21 via a shaft case 25, a spline ring 28 and a bolt 27.

  A partition plate portion 26 is provided in the middle of the inner hole of the hosel portion 23 in the longitudinal direction. A spline ring 28 is disposed on the upper side of the partition plate portion 26 and fixed by welding. Bolts 27 are inserted from below into the bolt insertion holes (openings) 26 a provided in the partition plate portion 26 and screwed into the female screw holes 25 m of the shaft case 25.

  The shaft case 25 is a cylindrical member having an outer diameter that is slightly smaller than the inner diameter of the hosel portion 23, and an insertion hole 25h of the shaft 24 is provided from the upper end side toward the lower end side. The shaft 24 is inserted into the shaft insertion hole 25h and is fixed by an adhesive. The depth of the shaft insertion hole 25h is preferably 10 mm or more, for example, 10 to 50 mm, particularly about 20 to 40 mm.

  An outer flange-like flange portion 25 b is provided at the upper end (rear end) of the shaft case 25. A synthetic resin ferrule 29 is fixed to the upper side of the flange portion 25b with an adhesive. This ferrule 29 consists only of a truncated cone-shaped part.

  The inner peripheral surface in the vicinity of the upper end portion of the shaft case 25 has a large diameter portion on the upper end side, an intermediate diameter portion on the lower side, and a small diameter portion on the lower side. A metal tube 30 is fixed to the middle diameter portion. The inner diameter of the metal tube 30 is the same as the inner diameter of the small diameter portion. The metal tube 30 protrudes into the large diameter portion. An adhesive 31 is filled between the metal tube 30 and the inner peripheral surface of the large diameter portion. The installation form of the metal tube 30 on the shaft case 25 is the same as the installation form of the metal tube 19 on the hosel part 11 in FIGS.

  A convex shaft portion 25 a is projected from the lower portion (tip portion) of the shaft case 25. The axis of the convex shaft portion 25 a is the same as the axis of the outer peripheral surface of the shaft case 25. Splines (protrusions parallel to the axial center line) are provided on the outer peripheral surface of the convex shaft portion 25a.

  A female screw hole 25m is provided so as to penetrate from the distal end surface of the convex shaft portion 25a in the axial direction.

  The spline ring 28 is a ring having a cylindrical outer peripheral shape. A spline is provided on the inner peripheral surface of the inner hole penetrating the spline ring 28 in the axial direction.

  In this embodiment, eight splines are provided, and the circumferential phase of the shaft case 25 can be changed by 45 °. However, there may be four splines, and the circumferential phase of the shaft case 25 may be changed by 90 °. Also, the number of splines may be 12, 16, 20, or the like.

  In order to assemble a golf club, a ferrule 29 is fitted into the shaft 24, the shaft case 25 is fixed to the tip of the shaft 24 with an adhesive, and the ferrule 29 is adhered to the flange portion 25 b of the shaft case 25. A case / shaft assembly is used.

  The convex shaft portion 25a of the shaft case 25 of the shaft case / shaft coupling body and the spline of the spline ring 28 are engaged. Next, the bolt 27 is screwed into the female screw hole 25m through the bolt insertion hole 26a.

  Thereby, as shown in FIG. 8, the shaft case 25 is fixed to the head 21. Since the shaft case 25 and the shaft 24 are firmly bonded by an adhesive, a golf club in which the shaft 24 and the head 21 are integrated is completed. Since the spline of the shaft case 25 and the spline of the spline ring 28 are engaged, the circumferential phase of the shaft 24 and the shaft case 25 is accurately determined. Further, the fixing rigidity in the torque direction of the shaft 24 and the shaft case 25 is high.

  In this embodiment, the golf club shaft can be easily replaced. In order to replace the shaft of the golf club, a shaft case of the same type as the shaft case 25 is fixed to the new shaft to be replaced in advance with an adhesive.

  The bolt 27 of the existing golf club is removed, and the old shaft 24 is removed from the head 21 together with the old shaft case 25. Next, a new shaft with a shaft case (shaft case / shaft coupled body) is inserted into the head 21 and fixed with bolts 27.

  In this way, the shaft can be attached and replaced very easily and quickly. In the past, when the shaft was replaced, the hosel part of the existing golf club was heated to break the structure of the cured adhesive, and after the shaft was pulled out, the new shaft was fixed with an adhesive. Although it took about 1 day, in the above embodiment, the shaft can be replaced in several minutes by attaching the shaft case 25 to the new shaft in advance with an adhesive. Therefore, it is possible to realize a utilization method in which shafts of various specifications with a shaft case are prepared, and different shafts are sequentially attached to the same head 21 for trial hitting.

  The shaft insertion hole 25h of the shaft case 25 may be eccentric with respect to the axial center of the outer peripheral surface of the shaft case 25 or may be inclined. When the shaft is eccentric as in the former case, the progression of the shaft can be adjusted by changing the direction of the shaft case 25. In the latter case, the lie angle and slice angle can be adjusted.

  In this embodiment, as shown in FIG. 8, the metal tube 30 protrudes from the middle diameter portion of the upper portion of the shaft insertion hole to the large diameter portion, as in FIGS. Similarly to the case, the shear stress generated in the shaft 24 near the entrance-side corner edge of the medium diameter portion is reduced. Further, the shear stress generated in the shaft 24 near the upper end of the metal tube 30 is also reduced.

  Each of the above embodiments is an example of the present invention, and the present invention may be configured other than illustrated. In the present invention, the metal tube may be made of titanium alloy, soft iron, stainless steel, or the like.

10, 10A, 21 Head 11, 23 Hosel portion 12, 25h Shaft insertion hole 12a Large diameter portion 12b Medium diameter portion 12c Small diameter portion 14, 14A, 14B, 29 Ferrule 15 Main body portion 15a Frustum shape portion 15b Insertion portion 16, 19, 30 Metal tube 18, 31 Adhesive

Claims (3)

In the ferrule where the shaft insertion hole penetrates and the lower part is bonded to the hosel part,
A synthetic resin main body having the shaft insertion hole;
A thin metal tube that is integral with the main body, is coaxial with the main body, and protrudes downward from the main body;
The metal tube is made of aluminum or an aluminum alloy, and the thickness of the metal tube is 0.1 to 0.3 mm.
A ferrule, wherein an inner peripheral surface of the metal tube is flush with an inner peripheral surface of a shaft insertion hole of a main body portion.   In Claim 1, The upper end of the said metal tube is located in the middle of the up-down direction of this main-body part, The diameter-expansion part which expands radially is provided in the upper end part of this metal tube, It is characterized by the above-mentioned. A ferrule. A shaft is inserted into a shaft insertion hole provided in a hosel part or a shaft case inserted into the hosel part, and the ferrule according to claim 1 or 2 is attached to an upper end part of the hosel part or the shaft case. A golf club characterized by

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