JP2000176060A - Manufacture of golf club shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture golf club shafts with linear projections on the surface. SOLUTION: A golf club shaft S1 has on the surface of its cylindrical shaft body H linear projections T extending in the longitudinal direction of the shaft body H. A shaft thicker than the shaft body H by the height of the linear projections T is prepared, and the shaft surface is thinned down by at least the height of the linear projections T so that only the linear projections T are left.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a golf club shaft having a surface with a ridge in a longitudinal direction.

[0002]

2. Description of the Related Art As a conventional golf club shaft of this type, the present applicant has filed a prior application (Japanese Patent Application No. 10-976).
No. 46).

[0003] As shown in FIGS. 13 and 14, the shaft S is provided on the surface of the shaft body 11.
In this embodiment, eleven convex strips 12 extending in the longitudinal direction of the first roll are provided at equal intervals. When the ridge 12 is provided over the entire surface of the shaft main body 11 as shown in FIG. 13, it may be partially provided, though not shown. The ridges 12 may be provided straight as shown in FIG. 13, or may be provided in a wave shape (meandering shape), a broken line shape, or a spiral shape (not shown).

Since the shaft S has such a shape that the ridge is provided on the shaft main body 11, the air resistance of the shaft is smaller than that of a shaft having a circular cross section and a smooth surface, which is currently widely used. Smaller.

[0005] Therefore, according to the golf club using the shaft S, it is possible to swing quickly and to increase the flight distance of the ball.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a golf club shaft having the above-mentioned features.

[0007]

The method of manufacturing a golf club shaft provided by the present invention is as follows.
It is described in (4).

(1) When manufacturing a golf club shaft by forming a ridge extending in the length direction of the shaft main body on the surface of the cylindrical shaft main body, a height equivalent to the height of the ridge from the shaft main body is previously determined. Make a thick walled shaft,
A method of manufacturing a shaft for a golf club (hereinafter referred to as a first manufacturing method), characterized in that at least a portion corresponding to the height of the ridge is removed while leaving only the ridge portion of the surface of the shaft.

(2) When manufacturing a golf club shaft by forming a ridge extending in the length direction of the shaft main body on the surface of the cylindrical shaft main body, the surface of the shaft main body corresponds to the height of the ridge. A method for manufacturing a shaft for a golf club (hereinafter referred to as a second manufacturing method) in which a build-up layer having a thickness of .).

(3) When manufacturing a golf club shaft by forming a ridge extending in the length direction of the shaft main body on the surface of the cylindrical shaft main body, the shaft main body is inserted into a mold, and between the two. A method of manufacturing a golf club shaft, which comprises injecting a curable liquid material into a formed ridge forming cavity (hereinafter, referred to as a third manufacturing method).

(4) When manufacturing a golf club shaft by forming a ridge extending in the length direction of the shaft main body on the surface of the cylindrical shaft main body, a separately prepared ridge is provided on the surface of the shaft main body. A method for manufacturing a golf club shaft, comprising bonding a member for use (hereinafter, referred to as a fourth manufacturing method).

[0012]

The first to fourth embodiments of the first to fourth manufacturing methods will be described below with reference to the drawings. In Examples 1 to 4, as shown in FIG. 2, FIG. 4, FIG. 7, and FIG.
This is an example of how to provide them.

That is, as shown in FIG. 2, FIG. 4, FIG. 7 and FIG.
m, 11 straight straight ridges T each having a substantially square cross section extending over the entire length in the longitudinal direction of the shaft main body H are provided at the same center angular interval on the surface of the cylindrical shaft main body 11 having a length of 1170 mm. Golf club shafts S _{1 to} S
_This is an example of how to provide the ridges T when making ₄ .

The shafts S ₁ to S ₁ obtained by the embodiments are described.
The outer diameter of the proximal end portion of the S ₄ are 15.8Mmfai, the outer diameter of the tip portion is 9.3Mmfai.

(Embodiment 1) Embodiment 1 is an embodiment of the first manufacturing method.

[0016] This example, a steel shaft body H is provided a steel ridge T, is an example of the case of making a shaft S ₁ shown in FIG.

First, as shown in FIG. 2, a processing shaft S _{0 having} a thickness (t ₂ ) which is greater than the thickness (t ₁ ) of the steel shaft body H by the height (h) of the ridge T. make.

[0018] Then, the surface of the working shaft S _0, leaving portions of the ridges T which is scheduled in advance, is removed by cutting just equivalent height of ridges T.

A shaft using a material other than steel, such as an aluminum shaft or a carbon shaft made of a composite material of carbon fiber and epoxy resin (hereinafter referred to as carbon), can be similarly described.

(Embodiment 2) Embodiment 2 is an embodiment of the second manufacturing method.

In this embodiment, a carbon build-up layer is formed on the surface of a carbon shaft main body H, and a portion thereof is removed by cutting or the like to form a ridge T. A shaft S ₂ shown in FIG. Here is an example of making.

First, as shown in FIG. 4, a thickness (t) corresponding to the height (h) of the ridge T is formed on the carbon shaft main body H.
₃ ) Shaft S ₀ for processing by providing a carbon overlay layer N
make.

Next, the build-up layer N is removed while leaving only the projected ridge T portion.

The materials used for the build-up layer N include:
In addition to carbon, materials such as thermoplastics, thermosetting plastics, rubber, and sponge rubber can be used. Further, as the material of the shaft main body H, a metal material can be used.

(Embodiment 3) Embodiment 3 is an embodiment of the third manufacturing method.

[0026] This example inserts a carbon shaft body H in a mold, providing the ridges T on the surface of the shaft body H by cast molding, an example of the case of making a shaft S ₃ shown in FIG.

First, a carbon shaft body H is prepared,
This is inserted into the mold K as shown in FIG. The mold K is equally divided into three.

Next, epoxy resin is injected into a cavity C for forming a ridge formed between the mold K and the carbon shaft main body H.

The shaft body H can be made of metal. As a material to be injected into the cavity C, a thermoplastic material which is a liquid material,
Thermosetting plastics, rubber and the like can be used.

(Embodiment 4) Embodiment 4 is an embodiment of the fourth manufacturing method.

[0031] This example, on the surface of the carbon shaft body H, by bonding a ridge T separately prepared, an example in making shafts S ₄ shown in FIG.

The manufacturing procedure of the shaft S ₄ are as follows.

(1) As shown in FIG. 8, a release sheet 3 is adhered to one side of a polyethylene sheet (0.8 mm thick) 1 via an adhesive layer 2, and a backing sheet 4 is attached to the other side. To make a laminate L.

(2) The portion other than the backing sheet 4 of the laminated body L is cut along a cut surface 5 perpendicular to the sheet 4. The position of the cutting surface 5 at this time is set to a position corresponding to the width of the ridges T (W ₁₎ and the width of the groove M (W ₂₎ in the shaft S ₄ in FIG.

(3) As shown in FIG. 9, the portion 6 corresponding to the groove M is removed from the laminate L of FIG.

(4) As shown in FIG. 9, the laminate L having the ridge T portion is peeled off the release sheet 3 and the adhesive layer 2 is applied to the surface of the carbon shaft main body H as shown in FIG. Paste in.

(5) After the attachment, the backing sheet 4 is removed.

The shaft S ₄ in FIG. 7 is a shaft made in the above process.

The shaft S ₄ can be manufactured by the following procedure.

(1) As shown in FIG. 11, the release sheet 3 of the ridge 6 of the laminate L cut at the cut surface 5 shown in FIG.
Peel off.

(2) As shown in FIG. 12, the laminate L from which the release sheet 3 at the six ridges was removed was applied to the pressure-sensitive adhesive layer 2,
Affix to the surface of the carbon shaft body H.

(3) After attaching, the backing sheet 4 is pulled to remove only the six ridges.

Note that another plastic sheet can be used in place of the polyethylene sheet 1 described above. Further, a metal shaft main body H can be used instead of the carpon shaft main body H.

In the above-described first to fourth embodiments, carbon, that is, a composite material of carbon fiber and epoxy resin and steel are used as the material of the shaft main body H and the ridge, but other materials that can be used as the shaft are also used. If so, adopt it.

In the first to fourth embodiments, the case where the shafts S _{1 to} S _{4 in} which the ridges T are provided at equal intervals around the shaft main body H and over the entire length thereof is described. However, even when manufacturing a shaft in which the ridge T is partially provided in the length direction of the shaft main body H or a shaft in which the ridge T is partially provided in the circumferential direction of the shaft main body H, the embodiment is not limited. The description can be made in the same manner as in Nos. 1-4.

Further, even in the case of manufacturing a shaft provided with a corrugated (meandering), broken line, or helical ridge T, the description can be made in the same manner as in the first to fourth embodiments.

[0047]

As described above, according to the present invention, since the above-described structure is employed, an effect that a golf club shaft having low air resistance can be manufactured can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a shaft according to a first embodiment.

FIG. 2 is a cross-sectional view of a processing shaft used for manufacturing the shaft of Example 1.

FIG. 3 is a sectional view of a shaft according to a second embodiment.

FIG. 4 is a cross-sectional view of a processing shaft formed by providing a buildup layer on a shaft main body used for manufacturing the shaft of Example 2.

FIG. 5 is a sectional view of a shaft according to a third embodiment.

FIG. 6 is a cross-sectional view illustrating a state where the shaft main body according to the third embodiment is inserted into a mold.

FIG. 7 is a sectional view of a shaft according to a fourth embodiment.

FIG. 8 is a side view showing a layer structure of a laminate for forming a ridge stuck to a shaft main body in a fourth embodiment.

FIG. 9 is a side view of a laminate for forming a ridge by sticking to a shaft main body in Example 4.

FIG. 10 is a side view showing a state where a laminate is pasted on a shaft main body in Example 4.

FIG. 11 is a side view of a laminate for forming a ridge by sticking to a shaft main body in Example 4.

FIG. 12 is a side view showing a state where a laminate is attached to a shaft main body according to the fourth embodiment.

FIG. 13 is a side view of a conventional golf club shaft.

14 is an enlarged cross-sectional view taken along the line AA of FIG. 11;

[Explanation of symbols]

H Shaft main body T Protrusions S _{1 to} S ₄ Golf club shaft S ₀ Processing shaft N Overlay layer K-type C cavity L Laminate 1 Polyethylene sheet 2 Adhesive layer 3 Release sheet 4 Backing sheet 5 Cut surface 6 Groove M Part equivalent to

Claims (4)

[Claims] When a golf club shaft is manufactured by forming a ridge extending in the length direction of the shaft main body on the surface of the cylindrical shaft main body, the ridge is thicker than the shaft main body by an amount corresponding to the height of the ridge in advance. A method for manufacturing a golf club shaft, comprising: forming a thick shaft; removing a surface of the shaft by a height corresponding to a height of the ridge while leaving only the ridge portion. 2. When manufacturing a golf club shaft by forming a ridge extending in the length direction of the shaft main body on the surface of the cylindrical shaft main body, the surface of the shaft main body has a height equivalent to the height of the ridge. A method of manufacturing a golf club shaft, comprising: providing a thick build-up layer, leaving only the build-up layer, and removing at least the periphery thereof. 3. When manufacturing a golf club shaft by forming a ridge extending in the longitudinal direction of the shaft main body on the surface of the cylindrical shaft main body, the shaft main body is inserted into a mold and formed between the two. A method of manufacturing a golf club shaft, comprising injecting a curable liquid material into a ridge forming cavity to be formed. 4. When manufacturing a golf club shaft by forming a ridge extending in the length direction of the shaft main body on the surface of the cylindrical shaft main body, the ridge for the separately prepared ridge is formed on the surface of the shaft main body. A method for manufacturing a golf club shaft, comprising bonding members.