JPH0810365A - Golf club shaft - Google Patents

Abstract

PURPOSE:To arrange the center of gravity in the same position as a steel shaft in a golf club shaft using carbon fiber, and smooth the bending of the shaft by winding a metal sheet on hand side, and covering the wound part with a surface layer. CONSTITUTION:A carbon shaft 1, for example, has a taper so that the diameter is increased from a tip (top end part) 2 on head side to a butt 3 on hand side, and a carbon wound thereon. A metal sheet 4 is formed of, for example, metal mesh or metal foil, and wound on a surface layer over a prescribed length from the butt 3. Thus, the center-of-gravity position is moved toward the butt 3 to move the center of gravity to the same position as a steel shaft. Further, the longitudinal strain of the surface layer on which the metal sheet 4 is wound is increased to smooth the bending of the carbon shaft 1.

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 using carbon fiber.

[0002]

2. Description of the Related Art As golf club shafts, carbon shafts have become popular in place of steel shafts.
The reason is that the characteristics of carbon shafts are much lighter than conventional steel shafts. Most conventional golf clubs use the above two types, that is, a steel shaft and a carbon shaft. However, since the carbon shaft is inferior in strength to the conventional steel shaft, it has the same strength as the steel shaft. Has been devised to ensure that. That is, in the conventional steel shaft, since the material strength is sufficiently large, it is designed such that almost the whole is made to have a uniform wall thickness and the center of gravity thereof is located substantially at the center. However, in the case of the carbon shaft, the same material strength as that of the conventional steel shaft cannot be expected, so that the strength is insufficient particularly in the tip (tip portion). Therefore, the current carbon shaft is designed to be thick on the tip side.

[0003]

In the conventional carbon shaft, since the lack of strength is compensated by designing the tip to be thick as described above, the center of gravity of the shaft is closer to the tip. If the center of gravity of the shaft differs between the steel shaft and the carbon shaft,
When a club set combining these, for example, a carbon shaft is used for wood and a steel shaft is used for irons, there is a problem in that the feeling of each shaft changes during golf swing.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a golf club shaft having a carbon shaft having a center of gravity at the same position as the steel shaft.

[0005]

To this end, the present invention is a golf club shaft using carbon fiber, characterized in that a metal sheet is wound on the hand side, and further, the metal sheet is wound on the surface layer. It is characterized by that.

[0006]

The golf club shaft of the present invention is a golf club shaft made of carbon fiber, and the metal sheet is wound around the golf club shaft. Therefore, the center of gravity of the shaft is moved to the golf club shaft side in the same manner as the steel shaft. be able to. Furthermore, since the metal sheet wound on the hand side is the surface layer, the expansion / contraction rate of the surface layer can be increased.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a golf club shaft 1 according to the present invention.
It is a figure which shows an Example, 1 is a carbon shaft, 2 is a chip, 3 is a bat, 4 is a metal sheet.

In FIG. 1, the carbon shaft 1 is designed such that the diameter increases from the tip (tip portion) 2 on the head side to the butt 3 on the proximal side, that is, it is tapered, or the head side is straightened and tapered from the middle. The metal sheet 4 is made of a metal mesh or a metal foil, and is wound on the surface layer for a predetermined length from the bat 3, for example.

In this way, when the metal sheet 4 is wound from the bat 3 over a predetermined length, the position of the center of gravity moves toward the bat 3, so that the center of gravity can be moved to the same position as the steel shaft. Further, when the metal sheet 4 is wound around the surface layer, the expansion / contraction rate of the surface layer increases, so that a smoother shaft bending can be realized than when the metal sheet 4 is wound around the intermediate layer.

FIG. 2 is a diagram for explaining a manufacturing process of the golf club shaft according to the present invention. When manufacturing the golf club shaft according to the present invention, first, for example, an epoxy having a thickness of about 0.3 mm is used. A carbon fiber sheet based on a material is cut into a rectangular shape as shown in FIG. 2A for the straight portion and a trapezoidal shape as shown in FIGS. 2B and 2C for the tapered portion. . Then, as shown in FIG. 2 (a) and (b) or (c), a mandrel made of a metal rod as a portion to be the inner diameter of the shaft is cut into 9 to 12 layers depending on the design of the shaft.
Wrap it in layers. At this time, a metal sheet made of a metal mesh or a metal foil is wound on the outermost layer. This metal sheet is integrated with a carbon fiber sheet in a width corresponding to the degree of the center of gravity that moves in advance. Then, a tape for fixing the sheet is used to wind the outer periphery while applying pressure. After that, each layer is integrated by heat treatment.
In other words, by heating, the epoxy melts to completely eliminate the fault. In this state, the tape is removed, the surface is subjected to polishing treatment, and the surface is washed, so that a so-called blank tube is completed. The carbon shaft is completed by coloring, painting and printing (logo) this raw tube.

[0011]

As is apparent from the above description, according to the present invention, the golf club shaft using the carbon fiber has the metal sheet wound on the proximal side, so that the position of the center of gravity of the shaft is set to the steel shaft. It can be moved to the hand side in the same way as, and the discomfort can be eliminated between the steel shaft and the carbon shaft. Furthermore, because the metal sheet that is rolled up on the side of the hand is used as the surface layer,
The expansion and contraction rate of the surface layer can be increased, and the bending of the shaft can be made smooth.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a golf club shaft according to the present invention.

FIG. 2 is a diagram for explaining a manufacturing process of the golf club shaft according to the present invention.

[Explanation of symbols]

1 ... Carbon shaft, 2 ... Chip, 3 ... Butt, 4 ...
Metal sheet

Claims (2)

[Claims] 1. A golf club shaft using carbon fiber, characterized in that a metal sheet is wound on the hand side. 2. The golf club shaft according to claim 1, wherein a metal sheet is wound around the surface layer.