JPH0574565U - Carbon shaft for golf club - Google Patents

Abstract

(57) [Abstract] [Purpose] A golf club carbon shaft using a carbon fiber is to be able to easily adjust the swing balance at the time of manufacture and to be comfortable to use. [Structure] The shaft 1 is formed in a hollow shape, and an inner carbon layer 11 is formed in the innermost portion.
A balance sheet 4 in which a lead plate is sandwiched between glass fiber sheets is spirally wound around the center of the shaft 1 around the inner carbon layer 11. An outer carbon layer 12 is formed on the outer circumference of the balance sheet 4, and a clear paint layer 13 is further formed on the outer circumference thereof.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a carbon shaft for a golf club using a carbon fiber, and more particularly to a carbon shaft for a golf club having a function of adjusting swing balance.

[0002]

[Prior Art]

 Conventionally, in golf clubs using a carbon shaft, various measures have been taken to adjust the swing balance. For example, in order to increase the swing balance, solid metal or powdery lead is injected into the hosel portion of the club head or the tip of the shaft. However, in the case of powdered lead, it is injected with resin impregnated.

On the other hand, in order to reduce the swing balance, a metal plug is fitted into the grip end, or sheet lead is wound between the grip and the shaft.

[0004]

[Problems to be solved by the device]

 However, in the method of injecting solid metal or powdery lead, these were often damaged by long-term use or impact. For this reason, not only the swing balance is changed, but also debris moves inside the shaft each time the swing is performed, which gives the user an unpleasant feeling.

On the other hand, in the method of fitting the metal plug into the grip end, it is necessary to prepare various kinds of fittings according to the diameter of the shaft and to make fine adjustments each time the fitting is carried out. Was in decline.

In addition, the method of winding the sheet lead between the grip and the shaft has a problem that the shape of the grip is distorted. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a carbon club for a golf club, which allows easy adjustment of the swing balance at the time of manufacture and can be used comfortably.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a carbon shaft for a golf club, which is characterized in that a predetermined amount of plate-like lead is sandwiched between carbon fiber layers in the carbon shaft for a golf club using a carbon fiber. To be done.

[0008]

[Action]

 Since only a predetermined amount of plate-shaped lead is sandwiched between the carbon fiber layers, the swing balance can be easily adjusted and the manufacturing is also easy.

[0009] Furthermore, since the plate-shaped lead is not damaged by long-term use or impact, the user does not feel uncomfortable. Furthermore, since the carbon fiber layer is further covered on the plate-shaped lead, the shape of the grip does not become distorted.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a schematic configuration of a golf club according to an embodiment of the present invention. The shaft 1 is made of carbon fiber, and a head 2 and a grip 3 are attached to both ends of the shaft 1. Inside the shaft 1 on the grip 3 side, a balance sheet 4 is provided spirally with respect to the center of the shaft 1.

FIG. 1 is a sectional view taken along the line AA of FIG. The shaft 1 is formed in a hollow shape, and an inner carbon layer 11 is formed in the innermost portion. A balance sheet 4 is spirally wound around the outer circumference of the inner carbon layer 11 as described later. An outer carbon layer 12 is formed on the outer periphery of the balance sheet 4.

Further, a clear paint layer 13 made of a urethane material is formed on the outer circumference of the outer carbon layer 12, that is, on the outermost circumference of the shaft 1. FIG. 3 is an exploded perspective view showing the structure of the balance sheet 4. The balance sheet 4 is composed of one thin lead plate 41 and two glass fiber sheets 42 and 43. The glass fiber sheets 42 and 43 are glass fibers impregnated with resin, and are formed to be sufficiently thinner than the lead plate 41. The glass fiber sheets 42 and 43 are formed such that their widths Ya and Yb are substantially equal to each other and are slightly wider than the width Xa of the lead plate 41. The balance sheet 4 is formed by sandwiching the lead plate 41 between the glass fiber sheets 42 and 43.

FIG. 4 is a sectional view taken along the line BB of FIG. The glass fiber sheets 42 and 43 sandwiching the lead plate 41 are bonded at their edges 42a and 43a and edges 42b and 43b to each other by hot pressing. As a result, the lead plate 41 is completely enclosed by the glass fiber sheets 42 and 43.

FIG. 5 is a diagram showing the configuration of the shaft 1 with the balance sheet 4 wound thereon. The balance sheet 4 is spirally wound around the inner carbon layer 11 by a length proportional to the required weight. However, the balance sheet 4 is wound from the end portion 14 of the shaft 1 at a predetermined distance Za (about several cm). An outer carbon layer 12 is formed on the outer side of the balance sheet 4.

When the inner carbon layer 11, the balance sheet 4, and the outer carbon layer 12 are thus formed, the shaft 1 is heat-treated. By the heat treatment, the resin impregnated in each carbon fiber of the inner carbon layer 11 and the outer carbon layer 12 is melted and fused, and the inner carbon layer 11 and the outer carbon layer 12 are bonded. At this time, the resin impregnated in the glass fiber sheets 42 and 43 of the balance sheet 4 also melts. As a result, the balance sheet 4 is also securely bonded to the inner carbon layer 11 and the outer carbon layer 12.

As described above, in this embodiment, since the balance sheet 4 having the lead plate 41 is sandwiched between the inner carbon layer 11 and the outer carbon layer 12, the grip shape is not distorted. You can easily adjust the swing balance. For this reason, manufacturing is also easy. Further, the balance sheet 4 is not likely to be damaged by long-term use, impact, etc., so that the user does not feel uncomfortable.

Further, in the present embodiment, the balance sheet 4 is configured so that the lead plate 41 is enclosed by the two glass fiber sheets 42 and 43, so that the inner carbon layer 11 or the outer carbon layer 12 is Peeling is prevented.

Further, in the present embodiment, the balance sheet 4 is wound around the end portion 14 of the shaft 1 at a predetermined distance Za, so that the balance sheet 4 is not exposed from the end portion 14. Therefore, peeling of the carbon layer from the exposed portion can be prevented, and damage to the shaft 1 can be prevented. Further, depending on how the predetermined distance Za is taken, even if the end portion of the shaft 1 is cut, the balance sheet 4 is not exposed from that portion.

In the present embodiment, the balance sheet 4 is formed in a strip shape and spirally wound on the outer circumference of the inner carbon layer 11. However, one sheet-shaped material is formed on the outer circumference of the inner carbon layer 11. You may stick it along.

In this embodiment, the balance sheet 4 is provided on the grip 3 side to lighten the swing balance. On the contrary, when it is desired to make the swing balance heavy, the balance sheet 4 is attached to the shaft 1. If it is provided on the head 2 side, the purpose can be easily achieved.

[0021]

[Effect of the device]

 As described above, in the present invention, the plate-shaped lead of a predetermined amount is sandwiched between the carbon fiber layers, so that the swing balance can be easily adjusted without distorting the shape of the grip. For this reason, manufacturing becomes easy.

Further, the balance sheet is not likely to be damaged by long-term use, impact, etc., so that the user does not feel uncomfortable.

[Brief description of drawings]

1 is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a diagram showing a schematic configuration of a golf club according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a configuration of a balance sheet.

4 is a cross-sectional view taken along the line BB of FIG.

FIG. 5 is a diagram showing a configuration of a shaft with a balance sheet wound thereon.

[Explanation of symbols]

 1 Shaft 2 Head 3 Grip 4 Balance Sheet 11 Inner Carbon Layer 12 Outer Carbon Layer 41 Lead Plate 42, 43 Glass Fiber Sheet

Claims (4)

[Scope of utility model registration request] 1. A carbon shaft for a golf club using a carbon fiber, wherein a predetermined amount of lead is sandwiched between carbon fiber layers. 2. The carbon shaft for a golf club according to claim 1, wherein the plate-shaped lead is sandwiched between glass fiber sheets. 3. The carbon shaft for a golf club according to claim 1, wherein the plate-shaped lead is provided in a portion separated from the end of the shaft by a predetermined distance. 4. The carbon shaft for a golf club according to claim 1, wherein the plate-shaped lead is provided on the grip side.