JPH07299167A - Shaft for golf club and its manufacture - Google Patents

Abstract

PURPOSE:To prevent the occurrence of zigzag or wrinkle in fiber of a thread like body or of an outer layer by arranging the fiber of a prepreg sheet forming the outer layer in the length direction of an axis of the shaft in the shaft for a specified golf club. CONSTITUTION:An inner layer 21 of a shaft for a golf club is made up of a plurality of prepreg sheets 33 impregnated with a matrix 31 comprising a synthetic resin wound on a high strength fiber 29. An intermediate layer 23 is made up of a plurality of prepreg sheets 39 impregnated with a matrix 37 comprising a synthetic resin wound plurality times on a high strength fiber 35. A thread-like body 25 is wound in a mesh on the outer circumference of the intermediate layer 23 and a prepreg sheet 45 in which a fiber 41 and a matrix 43 become transparent after the baking is wound on the outside of the thread-like body 25 to form an outer layer 27. Then, the fiber 41 of the prepreg sheet 45 forming the outer layer 27 is arrayed in the direction of an axis length of the inner layer 21 and the fiber 41 is fixed with the matrix 43 without being knitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club shaft and a manufacturing method thereof.

[0002]

2. Description of the Related Art Recently, for example, Japanese Utility Model Publication No. 63-46169
As disclosed in Japanese Unexamined Patent Application Publication No. 2004-242242, a golf club in which a shaft is made of fiber reinforced synthetic resin or synthetic resin has been developed.

FIGS. 4 and 5 show a golf club shaft of this type. In FIG. 4, reference numeral 11 denotes an inner layer formed by winding a prepreg sheet in which high strength fibers are impregnated with a matrix. There is.

An intermediate layer 13 is formed on the outer periphery of the inner layer 11, and a filamentous material 15 made of amorphous fibers, carbon fibers, Kepler fibers, etc. is wound around the outer periphery of the intermediate layer 13 in a mesh shape. .

An outer layer 17 is formed on the outside of the filament 15 by winding a prepreg sheet sheet made of, for example, a woven glass cloth, in which the fibers and the matrix become transparent after firing.

[0006]

In such a golf club shaft, as shown in FIG. 6, each layer is wound in a good state until the outer layer 17 is rolled, but taping or firing ( After cure),
As shown in FIGS. 7 and 8, the filament 15 and the outer layer 1
There is a problem that the meandering A or the wrinkle B gets close to the mesh-shaped fibers 19 that form 7.

In addition, a so-called zaku or whitening phenomenon occurs, and as shown in FIG. 8C, the braiding pattern formed by the filaments 15 becomes invisible, and when the outer layer 17 is surface-polished, it is exposed to light. As a result, the texture of the fibers 19 of the outer layer 17 becomes visible, resulting in poor appearance.
There is a problem that it causes a decrease in strength.

As a result of intensive studies conducted by the inventor of the present invention to solve such a conventional problem, it is found that the filaments 19 and the fibers 19 of the outer layer 17 are meandered or wrinkled due to a resin flow after taping or the like. When the diameter is reduced, the outer layer 1
It has been found that the fiber 19 wound in the circumferential direction of 7 cannot be shrunk in the center direction, and thus meanders in the axial direction, and the filament 15 also meanders in accordance with this meandering.

In addition, in the portion where the taping tightening force is insufficient, a zaku or whitening phenomenon occurs, and the filament 15
The braiding pattern formed by is no longer visible, and
It has been found that when the outer layer 17 is surface-polished, the texture of the fibers 19 of the outer layer 17 can be seen depending on how the light hits.

The present invention has been made on the basis of the above findings, and its object is to surely prevent the meandering or wrinkling of the filaments and the fibers of the outer layer and the occurrence of the zaku or whitening phenomenon. It is an object of the present invention to provide a golf club shaft and a manufacturing method thereof.

[0011]

According to a first aspect of the present invention, a filament is wound on an inner layer formed by winding a prepreg sheet in which high strength fibers are impregnated with a synthetic resin, and the filament is wound on the outer side of the filament. In a golf club shaft formed by winding an outer layer by winding a prepreg sheet in which fibers and a matrix become transparent after firing, the fibers of the prepreg sheet forming the outer layer are arranged in the axial direction of the shaft.

According to a second aspect of the present invention, a filament is wound around an inner layer formed by winding a prepreg sheet in which high-strength fibers are impregnated with a synthetic resin, and the fibers and matrix are fired outside the filament. After winding a prepreg sheet which is transparent and has the fibers arranged in the axial direction of the shaft, a tape is wound around the outer layer and fired.

[0013]

In the invention of claim 1, since the fibers of the prepreg sheet forming the outer layer are arranged on the shaft in the axial direction, the fibers do not meander even when shrink-molded toward the center. In addition, the tightening force by taping can be sufficiently applied.

In the second aspect of the present invention, first, a plurality of prepreg sheets in which high-strength fibers are impregnated with a matrix are wound around the outer periphery of the mandrel to form an inner layer. Next, a plurality of prepreg sheets in which high-strength fibers are impregnated with a matrix are wound around this inner layer to form an intermediate layer.

Thereafter, the filaments are wound around the outer periphery of the intermediate layer in a mesh shape. Next, a prepreg sheet, in which the fibers and the matrix are transparent after firing, is wound on the outside of the filamentous material so that the fibers are arranged in the axial direction of the inner layer to form the outer layer.

Then, taping is applied to the outer peripheral surface, and the tape is placed in a heating furnace and integrally formed by thermosetting treatment according to a conventional method. Then, the mandrel is pulled out to obtain a golf club shaft.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of the golf club shaft according to claim 1, and FIG. 2 is a sectional view thereof.
FIG. 3 is a process explanatory view showing an embodiment of a method for manufacturing a golf club shaft according to claim 2.

In FIG. 1, reference numeral 20 denotes a golf club shaft according to this embodiment. Reference numerals 21 and 23 represent an inner layer and an intermediate layer. A filament 25 is wound in a mesh shape on the outer side of the intermediate layer 23, and an outer layer 27 is formed on the outer side of the filament 25.

That is, as shown in FIG. 3B, the inner layer 21 is composed of high-strength fibers 29 such as carbon fibers, boron fibers, alumina fibers, aramid fibers, and glass fibers, and epoxy, polyester, phenol, etc. A plurality of prepreg sheets 3 impregnated with a resin matrix 31
It is formed by winding 3.

In the prepreg sheet 33, the high strength fibers 29 are knitted so as to intersect in the axial direction.
As shown in FIG. 3C, the intermediate layer 23 is made of carbon fiber,
A high strength fiber 35 such as boron fiber, alumina fiber, aramid fiber, glass fiber or the like is formed by winding a plurality of prepreg sheets 39 impregnated with a matrix 37 made of a synthetic resin such as epoxy, polyester or phenol a plurality of times. There is.

In the prepreg sheet 39, the high strength fibers 35 are arranged in the axial direction. This middle layer 2
As shown in (d) of FIG. 3, the outer periphery of 3 is a single yarn made of organic or inorganic fibers, or a filamentous body made by converging fibers,
For example, a filament 25 made of amorphous fiber, carbon fiber, Kepler fiber, etc. is wound in a mesh shape.

On the outside of the filament 25, as shown in FIG.
As shown in (e) of FIG.
The outer layer 27 is formed by winding the prepreg sheet 45, which is transparent after firing of No. 3.

As the fiber 41, for example, glass fiber, polyetherimide fiber or the like can be used,
Further, for the matrix 43, for example, a synthetic resin such as epoxy, polyester or phenol can be used.

However, in this embodiment, the fibers 41 of the prepreg sheet 45 forming the outer layer 27 are arranged in the axial direction of the inner layer 21. That is, the fibers 41 are not woven, but are simply arranged in the axial direction, and the fibers 41 are fixed by the matrix 43. A UD sheet (unidirectionally aligned sheet) is known as such a prepreg sheet.

The golf club shaft configured as described above is manufactured as described below. That is, first, as shown in FIG. 3A, a plurality of prepreg sheets 3 in which a high-strength fiber 29 is impregnated with a matrix 31 on a mandrel 49 having an outer circumference as a tapered surface 47.
3 is wound to form the inner layer 21.

At this time, the reinforcing pattern 51 is wound for the purpose of reinforcement and adjustment. After this, this inner layer 21
A plurality of prepreg sheets 39 in which the high-strength fibers 35 are impregnated with the matrix 37 are wound a plurality of times on the intermediate layer 2
3 is formed.

Thereafter, the filament 25 is wound around the intermediate layer 23 in a mesh shape. After this, on the outside of the filament 25,
The prepreg sheet 45, in which the fibers 41 and the matrix 43 are transparent after firing, is wound so that the fibers 41 are arranged in the axial direction of the inner layer 21 to form the outer layer 27.

Thereafter, the tape 53 is wound around the outer layer 27, and the taped shaft is fired to manufacture a golf club shaft. In the golf club shaft 20 configured as described above, the fibers 41 of the prepreg sheet 45 forming the outer layer 27 are arranged in the axial direction of the inner layer 21, so that the shaft is shrink-molded toward the center. However, the meandering of the fiber 41 does not occur, and the meandering of the filament 25 can be eliminated, and the tightening force by taping can be sufficiently applied.

That is, in the golf club shaft 20 configured as described above, the filament 25 and the outer layer 27 are provided.
It is possible to reliably prevent the meandering or wrinkling of the fiber 41. Also, it becomes possible to effectively prevent the occurrence of so-called Zaku or whitening phenomenon,
It is possible to surely eliminate the visible braiding pattern formed by the filamentous material, and to see the texture of the fibers of the outer layer depending on how the light hits when the outer layer is surface-polished as in the past. Become.

Furthermore, since it is possible to reliably prevent the meandering or wrinkling of the filaments 25 and the fibers 41 of the outer layer 27, it is possible to significantly improve the strength as compared with the prior art.

In the method for manufacturing the golf club shaft described above, the manufacturing process includes the steps of winding the prepreg sheet 33 in which the high-strength fiber 29 is impregnated with the matrix 31 to form the inner layer 21, and the inner layer 21. Filament 25
The step of winding the fiber and the fiber 41 on the outside of the filament 25
And a step of winding the prepreg sheet 45, in which the matrix 43 becomes transparent after firing, so that the fibers 41 are arranged in the axial direction of the inner layer 21 to form the outer layer 27, and the tape 53 is wound around the outer layer 27. Since the process and the process of firing the shaft wound with the tape 53 are performed, the fibers of the prepreg sheet 45 forming the outer layer 27 can be easily arranged in the axial direction of the inner layer 21.

In the embodiment described above, the example in which the intermediate layer 23 is formed outside the inner layer 21 has been described, but the present invention is not limited to such an example, and the intermediate layer 23 is formed. Of course, it is not necessary to do so.

[0033]

As described above, according to the invention of claim 1,
Since the fibers of the prepreg sheet forming the outer layer are arranged in the axial direction of the inner layer, even if the outer diameter of the shaft is shrink-molded toward the center by the resin flow after taping,
The filaments are prevented from meandering, which makes the filaments visible through the outer layer look beautiful.

Further, according to the invention of claim 2, since the fibers of the prepreg sheet forming the outer layer are arranged in the axial direction of the inner layer, the fibers meander even when shrink-molded toward the center. In addition, it is possible to sufficiently apply the tightening force by taping, which ensures that meandering or wrinkling occurs in the filament and the fibers of the outer layer, and that zaku or whitening phenomenon occurs. Can be prevented.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a golf club shaft according to claim 1.

FIG. 2 is a vertical sectional view taken along the line EE of FIG.

FIG. 3 is a process explanatory view showing an embodiment of a method for manufacturing a golf club shaft according to claim 2;

FIG. 4 is a side view showing a conventional golf club shaft.

5 is a vertical cross-sectional view taken along the line of FIG.

FIG. 6 is a transverse cross-sectional view showing a state of the golf club shaft of FIG. 4 during outer layer rolling.

FIG. 7 is a transverse cross-sectional view showing a state after taping and firing of the golf club shaft of FIG.

FIG. 8 is a side view showing a state after taping and firing of the golf club shaft of FIG.

[Explanation of symbols]

 20 Shaft for Golf Club 21 Inner Layer 25 Filament 27 Outer Layer 29 Reinforcing Fiber 33,45 Prepreg Sheet 41 Fiber 43 Matrix

Claims (2)

[Claims] 1. A prepreg sheet in which a filament is wound around an inner layer formed by winding a high-strength fiber impregnated with a synthetic resin, and a fiber and a matrix are transparent to the outside of the filament after firing. A shaft for a golf club in which the outer layer is wound to form a fiber, and the fibers of the prepreg sheet forming the outer layer are arranged in the axial direction of the shaft. 2. A filament is wound around an inner layer formed by winding a prepreg sheet in which high-strength fibers are impregnated with a synthetic resin, and the fibers and the matrix are transparent to the outside of the filament, and become transparent after firing. A method for manufacturing a golf club shaft, comprising winding a prepreg sheet in which fibers are arranged in the axial direction of the shaft, winding the tape around the outer layer, and firing the tape.