JP2001137404A - Shaft for golf club and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft for a golf club which does require the additional winding of a molding material around the shaft when regulating the position of its kick point and allows the easy regulation of suppleness, hardness and the position of the kick point in production, although the weight of the shaft is not increased by this additional winding. SOLUTION: The outside diameter of the shaft is formed to a two-step taper varying in the size of its taper angle and the taper angle at the outside diameter surface in the tapered part on the bottom side is set smaller than the taper angle at the outside diameter surface in the taper part on the front end side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a golf club shaft and a method for manufacturing the same.

[0002]

2. Description of the Related Art A golf club shaft is made of CFRP.
Points of wood club shafts (K ・ P, bending points)
The flexural rigidity is greatly related to the golfer's head speed, and if the kick point or the flexural rigidity is selected incorrectly, the maximum ball flight distance cannot be obtained.

In particular, it is known that the position of a kick point affects the amount of ball spin. The closer the position is to the hand, the smaller the amount of ball spin, the less likely it is to be a blown ball, and a golfer with a high head speed. Work favorably.

However, as shown in FIG. 5, in the conventional CFRP shaft 51, the taper angle of the outer diameter surface is set to a uniform angle from the distal end 52 to the grip end 53. The taper angle of the outer diameter surface of the cored bar 61 used in manufacturing the 51 is also set to a uniform angle from the front end 62 to the rear end 63 on the grip end side. This is due to the ease of decentering after molding and the prepreg sheet 5 during molding.
This is for ensuring the ease of lamination of No. 4 and the like.

The shaft 5 having such a uniform taper
In order to adjust the position of the kick point in 1 in terms of the front tone or the hand tone, as shown in the figure, it is general to adjust the kick points by partially winding short prepreg sheets 55 and 56 (inner diameter). When the sheet 56 on the side is rolled up, it is necessary to process the tip of the core bar). Adjusting the position of the kick point in this way disadvantageously increases the weight of the shaft 51 due to the rollup of the sheets 55 and 56. In particular, the tip of the hand tone shaft tends to be heavier than the tip tone shaft, and it is necessary to attach a heavier grip in order to balance the club, so that the total weight becomes considerably large. In addition, since the weight is inclined to the tip of the shaft, it becomes difficult to mount a large head.

[0006]

SUMMARY OF THE INVENTION In view of the above, the present invention does not require a molding material such as a prepreg sheet to be added to the shaft when adjusting the position of the kick point, and thus the addition of the winding increases the weight of the shaft. An object of the present invention is to provide a golf club shaft capable of easily adjusting the bending stiffness and the position of a kick point at the time of manufacture, and a method of manufacturing the same.

[0007]

According to a first aspect of the present invention, there is provided a golf club shaft according to the present invention, wherein the outer diameter of the shaft is a two-stage taper having different taper angles. The taper angle of the outer diameter surface at the proximal taper portion is set to be smaller than the taper angle of the outer diameter surface at the distal taper portion.

Further, the golf club shaft according to the second aspect of the present invention has a tip side tapered portion having a relatively large taper angle of the outer diameter surface at the tip end side of the shaft.
A tapered portion on the proximal side of the shaft having a relatively small taper angle of the outer diameter surface is provided.

According to a third aspect of the present invention, there is provided a golf club shaft according to the first or second aspect of the invention, wherein the taper angle of the outer diameter surface at the tapered portion on the distal end side is 6/1000 in terms of gradient. ~ 13/100
In addition to the setting of 0, the taper angle of the outer diameter surface in the proximal taper portion is set to 1/1000 to 5/1000 in terms of a gradient amount.

According to a fourth aspect of the present invention, there is provided a golf club shaft according to the first or second aspect of the present invention, wherein the taper angle of the outer diameter surface at the tip side tapered portion is 6/1000 in gradient amount. ~ 13/100
0, the taper angle of the outer diameter surface at the tapered portion on the hand side is set to 1/1000 to 5/1000 in gradient amount, and the length of the tapered portion on the hand side is set to 2 from the grip end.
It is characterized in that it is set to be from 00 to 600 mm.

A method of manufacturing a golf club shaft according to claim 5 of the present invention is as described in claim 1 or 2 above.
A method of manufacturing a golf club shaft according to claim 1, further comprising a distal-side tapered portion having a relatively large taper angle of an outer diameter surface on a distal side, and a proximal-side tapered portion having a relatively small taper angle of an outer diameter surface on a proximal side. The present invention is characterized in that a shaft is manufactured by laminating a molding material on the outer periphery of a metal core provided with the above.

A method of manufacturing a golf club shaft according to claim 6 of the present invention is the above-described claim 1 or 2.
A method of manufacturing a golf club shaft according to claim 1, further comprising a distal-side tapered portion having a relatively large taper angle of an outer diameter surface on a distal side, and a proximal-side tapered portion having a relatively small taper angle of an outer diameter surface on a proximal side. A shaft is manufactured by laminating a molding material on the outer periphery of a cored bar having a taper angle of an outer diameter surface at a tip side taper portion, a taper angle of an outer diameter surface at a hand side taper portion, and a taper angle of a tip side taper portion. The position of the kick point is adjusted by changing the length and the length of the proximal taper portion.

[0013] The shaft or the method of manufacturing the shaft according to the present invention having the above-described structure is characterized in that at the time of manufacturing the shaft,
By changing the taper angle of the outer diameter surface at the distal taper portion, the taper angle of the outer diameter surface at the proximal taper portion, the length of the distal taper portion or the length of the proximal taper portion, Since the position of the kick point can be easily adjusted, and since the molding material is not added, the weight of the shaft can be reduced accordingly. In addition, the above adjustment is performed by adjusting the taper angle of the outer diameter surface at the tip side taper portion of the core metal around which the molding material is wound at the time of manufacturing the shaft, the taper angle of the outer diameter surface at the hand side taper portion, the length of the tip side taper portion or the hand side. This is performed by changing the length of the tapered portion and the like.

Further, the present invention is characterized in that
By setting a very gentle taper angle up to 00 mm, and passing the portion to the tip, a tight taper angle makes it possible to easily change the bending rigidity force and the position of the kick point, and This eliminates the need for additional winding, which leads to a reduction in the weight of the shaft.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

First Embodiment A shaft 1 according to this embodiment is a shaft for a wood club, and is configured as follows.

[0017] That is, first, as shown in FIG. 1, the overall length _{L 1} of the shaft 1 is formed in a range of 1000～1300Mm. Further, the outer diameter is formed in a two-step taper shape having different taper angles, and the taper angle of the outer diameter surface is relatively large up to the tip 2 at the tip side. 4, and a hand-side tapered portion 5 having a relatively small taper angle of the outer diameter surface is provided on the hand side to the grip end 3.
The large-diameter end of the distal taper 4 and the small-diameter end of the proximal taper 5 have the same diameter and are continuous.

The taper angle of the outer diameter surface at the tip side taper portion 4 is set to 9/1000 in terms of a gradient amount (also referred to as a gradient rate). Is set to 4/1000. This is because, while the taper angle of the outer diameter surface of the conventional uniform taper shaft is 6/1000 to 9/1000 in gradient amount, the former is almost the same and the latter is smaller. .

The length L ₂ of the proximal tapered portion 5 is:
When it is set to 500 mm from the grip end 3 and the total length L _{1 of the} shaft ₁ is 1150 mm,
The length _{L 3} of the distal end taper portion 4 will be referred to as 650 mm.

The shaft 1 is formed as a hollow cylindrical body over its entire length. Also this shaft 1
Is a CFRP-based shaft, which is formed by a laminated structure of a prepreg sheet (having a reinforcing fiber material impregnated with a matrix resin and formed into a shape that is easy to form).

When the shaft 1 is manufactured, as shown in FIG. 2, a distal end 12 is provided with a distal end side tapered portion 14 having a relatively large outer surface taper angle, and a rear end 13 side (hand side). ), A mandrel (also referred to as a mold) 11 having a hand-side tapered portion 15 having a relatively small outer surface taper angle is used. A required number of prepreg sheets 6 are laminated on the outer periphery of the mandrel 11 and cured. Decenter. The taper angle of the outer diameter surface of the distal side taper portion 14 is
Is set to 9/1000 in terms of the gradient, and the taper angle of the outer diameter surface of the proximal tapered portion 15 is set to 4/1000 in terms of the gradient.

Second Embodiment The shaft 1 according to this embodiment is a shaft for a wood club, and is configured as follows.

[0023] That is, first, as shown in FIG. 3, the overall length _{L 1} of the shaft 1 is formed in a range of 1000～1300Mm. Further, the outer diameter is formed in a two-step taper shape having different taper angles, and the taper angle of the outer diameter surface is relatively large up to the tip 2 at the tip side. 4, and a hand-side tapered portion 5 having a relatively small taper angle of the outer diameter surface is provided on the hand side to the grip end 3.
The large-diameter end of the distal taper 4 and the small-diameter end of the proximal taper 5 have the same diameter and are continuous.

The taper angle of the outer diameter surface at the tip side taper portion 4 is set to 9/1000 in terms of the gradient amount, and the taper angle of the outer diameter surface in the hand side taper portion 5 is set to 4 in the gradient amount.
/ 1000 is set. This is because, while the taper angle of the outer diameter surface of the conventional uniform taper shaft is 6/1000 to 9/1000 in gradient amount, the former is almost the same and the latter is smaller. .

The length L ₂ of the proximal tapered portion 5 is
When it is set to 200 mm from the grip end 3 and the total length L _{1 of the} shaft ₁ is 1150 mm,
The length _{L 3} of the distal end taper portion 4 will be referred to as 950 mm.

The shaft 1 is formed as a hollow cylindrical body over its entire length. Also this shaft 1
Is a CFRP-based shaft, which is formed by a laminated structure of the prepreg sheet 6.

When the shaft 1 is manufactured, as shown in FIG. 4, the distal end 12 is provided with a distally tapered portion 14 having a relatively large taper angle of the outer diameter surface at the distal end 12 side and a rear end 13 side (hand side). ) Using the metal core 11 provided with the proximal tapered portion 15 having a relatively small outer surface taper angle,
A required number of prepreg sheets 6 are laminated on the outer periphery of the cored bar 11, cured, and de-centered. The taper angle of the outer diameter surface of the tip side taper portion 14 is set to 9/1000 in terms of the gradient amount in accordance with the specification setting of the shaft 1, and the taper angle of the outer diameter surface of the hand side taper portion 15 is 4/10 in gradient amount
00 is set.

The shaft 1 according to a second embodiment the shaft 1 according to the first embodiment, the length L ₂ of the proximal tapered portion 5 is in the range of 500mm from the grip end 3 in the former, the latter the only difference was and in that the length L ₂ of the proximal tapered portion 5 is 200mm from the grip end 3 (Accordingly, the length L ₃ of the distal end taper portion 4 is also different), the only Based on the differences
The position of the kick point in the former is approximately 7 from tip 2
In contrast, the position of the kick point in the latter is approximately 600 mm from the tip 2, and the position of the kick point is shifted by about 100 mm. Therefore, the length L ₂ of the proximal tapered portion 5
The position of the kick point can be arbitrarily adjusted by appropriately changing the position of the kick point, and the position of the kick point can be arbitrarily adjusted without partially winding the molding material as in the related art. Therefore, the weight of the shaft 1 can be substantially reduced without the need for additional winding. According to a test conducted by the inventors of the present invention, this weight reduction was approximately 5 g (conventional example (uniform tapered shaft) was 65 g, whereas the product of the present invention was 60 g).
In addition, since the weight of the shaft 1 is reduced, the size of the head can be increased, and the total weight of the club can be reduced.

Incidentally, in each of the embodiments, each drawing is extremely deformed and shows the cross section of the shaft 1 and the cross section of the metal core 11, and therefore each drawing is merely a configuration explanatory view of the shaft 1. .

[0030]

The present invention has the following effects.

That is, according to the shaft or the method of manufacturing the shaft according to the present invention having the above-described structure, it is not necessary to wind a molding material such as a prepreg sheet around the shaft when adjusting the position of the kick point. Although the weight of the shaft does not increase due to the addition, it is possible to provide a golf club shaft in which the bending rigidity and the position of the kick point can be easily adjusted at the time of manufacturing. Further, the weight of the shaft can be reduced by eliminating the need to add the molding material.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view of a shaft according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a method for manufacturing the shaft.

FIG. 3 is a configuration explanatory view of a shaft according to a second embodiment of the present invention.

FIG. 4 is an explanatory view showing a method for manufacturing the shaft.

FIG. 5 is an explanatory view of a configuration and a manufacturing method of a shaft according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft 2, 12 Tip 3 Grip end 4 Tip side taper part 5 Hand side taper part 6 Pre-preg sheet 11 Core metal 13 Rear end 14 Tip side taper part 15 Hand side taper part

Claims (6)

[Claims] The outer diameter of the shaft is a two-step taper having different taper angles, and the outer diameter of the outer diameter surface at the proximal taper portion is larger than the taper angle of the outer diameter surface at the distal taper portion. A golf club shaft, wherein the taper angle is set smaller. 2. A tip side taper portion having a relatively large taper angle of an outer diameter surface is provided on a tip side of a shaft, and a hand side taper portion having a relatively small taper angle of an outer diameter surface is provided on a hand side of the shaft. A shaft for a golf club, wherein the shaft is provided. 3. The golf club shaft according to claim 1, wherein the taper angle of the outer diameter surface at the tip side taper portion is set to 6/1000 to 13/1000 in terms of a gradient amount, and the outer diameter at the proximal side taper portion is set. A shaft for a golf club, wherein a taper angle of a radial surface is set in a gradient amount of 1/1000 to 5/1000. 4. The golf club shaft according to claim 1, wherein the taper angle of the outer diameter surface at the tip side taper portion is set to 6/1000 to 13/1000 in terms of gradient, and the outer diameter at the proximal side taper portion. The taper angle of the diameter surface is 1
/ 1000 to 5/1000, and the length of the hand side tapered portion is set to 200 to 600 mm from the grip end. 5. The method for manufacturing a golf club shaft according to claim 1, wherein a tip side tapered portion having a relatively large taper angle of an outer diameter surface is provided at a tip side and the outer diameter surface is formed at a hand side. A method of manufacturing a shaft for a golf club, comprising manufacturing a shaft by laminating a molding material on an outer periphery of a metal core having a proximal taper portion having a relatively small taper angle. 6. The method for manufacturing a golf club shaft according to claim 1, wherein a tip side tapered portion having a relatively large outer diameter surface is provided at a tip side, and the outer diameter surface is formed at a hand side. The shaft is manufactured by laminating a molding material on the outer periphery of a core metal having a relatively small taper portion on the proximal side and a taper angle of an outer diameter surface on the distal side taper portion, and an outer diameter on the proximal side taper portion. A method for manufacturing a golf club shaft, comprising: adjusting a position of a kick point by changing a taper angle of a surface, a length of a tip side taper portion, and a length of a hand side taper portion.