JP2013111384A - Golf club shaft, and golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club shaft for which weight on a butt side is increased by disposing prepreg containing glass fibers on the butt side, and to provide a golf club using the golf club shaft.SOLUTION: The golf club shaft is manufactured by winding prepregs 11-21 around a mandrel 10 and curing them. The prepregs 11-21 include fibers and a matrix resin. In the prepregs 11-13 and 15-21 other than the prepreg 14, the fibers are carbon fibers. In the prepreg 14 wound around only on the butt side, the weight on the butt side is increased by disposing, on the butt side, only the glass fibers or the glass fibers containing the glass fibers and the carbon fibers.

Description

  The present invention relates to a golf club shaft, and more particularly to a golf club shaft made of fiber reinforced resin. The present invention also relates to a golf club having this golf club shaft.

  Golf club shafts are roughly classified into so-called steel shafts and carbon shafts. Carbon shafts are widely used from the viewpoint of light weight and high design freedom.

  The carbon shaft is made of a fiber reinforced resin whose main fiber is carbon fiber. As a method for producing the carbon shaft, a sheet winding method is known (Patent Document 1). In this manufacturing method, a sheet-shaped prepreg is wound around a mandrel (core metal), a wrapping tape is further wound, and then the prepreg is cured by heating.

  In the golf club, the heavier the tip side to which the head is fixed, the greater the kinetic energy. Therefore, when the golf club is swung, a large initial speed can be given to the ball, and the ball flight distance can be extended. However, if only the tip side is heavy, the center of gravity of the club is extremely biased toward the tip side, making it difficult to swing. For this reason, in order to make the tip side of the shaft heavy, the grip side of the base is also made heavy. In addition, if the tip side and the grip side are made heavy and the middle part is lightened in this way, the swing-out performance at the time of swing is improved. As described above, the golf club has a ball flight distance and a swing property that change depending on the weight distribution between the front end side and the grip side. .

  This weight adjustment varies depending on the physical strength and preference of the player, so it is necessary to prepare various types, but preparing various types of heads and shafts with different weights greatly increases manufacturing costs and storage costs. Invite. Therefore, for weight adjustment, create several types of heads and shafts with different weights, and if you want to make the tip side heavy, stick a lead plate to the head, and if you want to make the grip side heavy, lead plate on the inner side of the grip side of the shaft It was done by a simple method of pasting.

JP 2010-259694 A

  If you try to increase the weight on the grip side of the carbon shaft by attaching the lead plate, the weight of the shaft is lighter than the metal shaft made of the conventional metal pipe, and the lead plate with a large specific gravity can only be applied locally. For this reason, the entire grip side cannot be increased, and the rotation moment changes depending on the grip position of the player.

  An object of the present invention is to provide a golf club shaft in which the weight on the bat side is increased using a glass fiber-containing prepreg, and a golf club using the golf club shaft.

  The golf club shaft of the present invention is formed by curing a wound prepreg, and a golf club having a high specific gravity material higher than that of carbon fiber on the butt side of the golf club shaft. In the shaft, the high specific gravity material is distributed by winding a glass fiber-containing prepreg on the butt side.

  In one embodiment of the present invention, the glass fibers are distributed in the straight direction.

  In another aspect of the present invention, the glass fiber is distributed only in the hoop direction.

  In the present invention, the glass fiber-containing prepreg is preferably distributed in the range of 15 to 45% of the entire shaft length from the butt side.

  When the golf club shaft of the present invention is a golf club shaft for a wood club, the total weight of the glass fibers is preferably 2 to 6 g.

  The golf club of the present invention has the golf club shaft of the present invention.

  The golf club shaft of the present invention is obtained by winding a glass fiber-containing prepreg on the butt side to increase the weight on the bat side, and can distribute a high specific gravity material uniformly over a wide range on the bat side.

  The crushing strength on the butt side of the shaft is increased by winding a prepreg having a glass fiber distributed in the hoop direction on the butt side.

It is winding explanatory drawing of a prepreg. It is a perspective view of a golf club and its shaft.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 is a view for explaining a golf club shaft manufacturing method according to an embodiment of the present invention. In this manufacturing method, the mandrel 10 and the prepregs 11 to 21 are used. The central axis of the mandrel 2 is a straight line. The cross-sectional shape perpendicular to the axial center line of the mandrel 2 is a circle. The mandrel 2 has a taper in which the tip side (head side) is thin and the bat side (grip side) is thick, but it may have an equal diameter part with a constant diameter.

  Preferably, after a release agent is applied to the surface of the mandrel 10, the sheet-like prepregs 11 to 22 are sequentially wound.

  The prepregs 11 to 22 include fibers and a matrix resin. In the prepregs 11 to 14, 16 to 21 other than the prepreg 15, the fiber is a carbon fiber. In the prepreg 15, the fiber is a glass fiber.

  In this embodiment, in the prepregs 11, 14, 17, 19, 20, 21, and 22, the fibers are oriented in the straight direction, that is, the longitudinal direction of the shaft. In the prepregs 15, 16, and 18, the fibers are oriented in the hoop direction, that is, the shaft circumferential direction. The fibers of the prepreg 20 may be in the hoop direction. In the prepreg 12, the fibers are oriented in the + 45 ° bias direction (shaft longitudinal direction and oblique direction), and in the prepreg 13, the fibers are oriented in the −45 ° bias direction. The fibers of the prepreg 12 may be oriented at −45 °, and the fibers of the prepreg 13 may be oriented at + 45 °. Further, the bias direction is not limited to 45 °, and may be in the range of 30 to 60 °.

  The prepregs 12, 13, 16 to 20 have a length extending over the entire length of the shaft. The prepregs 11, 21, and 22 have a length of about 5 to 45%, particularly about 8 to 30% of the total length of the shaft so as to be distributed only on the tip side of the shaft. The prepregs 14 and 15 are distributed only on the butt side, and the length in the longitudinal direction of the shaft is preferably 15 to 45%, particularly 20 to 40%, particularly 25 to 35% of the total length of the shaft.

  The prepregs 16 to 20 have a width that is wound around the outer periphery of the mandrel 10 only once. The prepregs 11 to 15, 21, and 22 have a width that is wound around the outer periphery of the mandrel 10 a plurality of times, for example, about 2 to 5 times.

  The thickness of the prepregs 12 and 13 is preferably 0.125 mm or less, particularly about 0.05 to 0.1 mm. The thickness of the prepregs 16 and 18 is preferably 0.1 mm or less, particularly about 0.02 to 0.05 mm. The thickness of the prepregs 17, 19, and 20 is preferably 0.125 mm or less, particularly about 0.05 to 0.1 mm. The thickness of the prepreg 14 is preferably 0.125 mm or less, particularly about 0.05 to 0.1 mm. The thickness of the prepregs 11, 21, 22 is preferably 0.125 mm or less, particularly preferably about 0.05 to 0.1 mm. The thickness of the glass fiber-containing prepreg 15 is preferably 0.05 mm or less, for example, about 0.01 to 0.05 mm so that the prepreg 15 can be easily wound.

The ratio of the fibers in each of the prepregs 11 to 22 is preferably about FAW 10 to 150 g / m ^2, particularly about ²⁰ to 125 g / m ² . As the resin, an epoxy resin or the like is suitable.

The tensile modulus of the carbon fibers in the prepreg is preferably the case of the straight direction is 10~80ton / mm ² particularly 24~40ton / mm ² approximately, when the hoop direction 8~30ton / mm ² (about 78.4 ˜294 GPa) Particularly preferred is about 10 to 24 ton / mm ² . The carbon fiber in the bias direction preferably has a high elastic modulus of 40 ton / mm ² (about 392 GPa) or more, for example, 40 to 46 ton / mm ² .

In the glass fiber-containing prepreg 15, the tensile modulus of the glass fiber is preferably about 7 to 10 ton / mm ² (about 68.6 to 98 GPa).

  Since the sizes of the prepregs 14 and 15 are the same, they can be overlapped and wound.

  When the prepregs 11 to 22 are wound around the mandrel 10, each of the prepregs 11 to 22 may be wound one by one, or a part of the prepregs may be bonded and wound. For example, the prepregs 14 and 15, the prepregs 16 and 17, and the prepregs 18 and 19 may be bonded together. The operation of winding the prepregs 11 to 22 around the mandrel 10 may be performed manually or a winding machine (also referred to as a rolling machine) may be used. After the prepregs 11 to 22 are wound around the mandrel, a wrapping tape winding step is performed. Although not shown, the wrapping tape is wound spirally.

  After the winding process, a curing process is performed by heating, and the matrix resin in the prepreg is cured.

  After the curing step, the mandrel 16 is pulled out and the wrapping tape is removed to obtain a cured tubular body (element tube). Both ends of the base tube are cut as necessary, and then polished to obtain a golf club shaft 3 (FIG. 2B). By attaching the head 2 and the grip 4 to the golf club shaft 3, the golf club 1 (FIG. 2A) is obtained.

  In this shaft 3, since the glass fiber is contained in the prepreg 15 distributed only on the butt side, the weight on the butt side of the shaft 3 is increased. The range L in which the glass fibers are present is preferably 15 to 45%, particularly 20 to 40%, especially 25 to 35% of the total length of the shaft 3 from the butt side of the shaft 3. In the case of a shaft for a wood type golf club, the total length of the shaft is about 1050 to 1220 mm. In the case of a golf club shaft for wood, the total weight of the glass fiber is preferably about 2 to 6 g, particularly about 3 to 5 g.

Since the prepreg 15 contains glass fibers in the hoop direction, the crush strength on the butt side of the shaft 3 is high. Therefore, the shaft is prevented from being crushed even when the shaft is strongly clamped with a clamping tool such as a vise at the time of grip replacement.
In the above description, the prepreg 14 is a carbon fiber-containing prepreg, but the prepreg 14 may be a glass fiber-containing prepreg in which glass fibers are distributed in a straight direction. In this case, the thickness of the glass fiber-containing prepreg 14 is preferably 0.05 to 0.13 mm, particularly preferably about 0.12 to 0.13 mm.
Moreover, in the said description, although the glass fiber of the glass fiber containing prepreg 15 has become the hoop direction, a straight direction may be sufficient.

  The above-described lamination example of the prepreg in FIG. 1 is an example of the present invention, and may be a lamination example other than FIG. For example, in FIG. 1, a prepreg in the hoop direction similar to the prepreg 16 (or 18) may be interposed between the prepregs 19 and 20 in the straight direction. In FIG. 1, some prepregs in the hoop direction, for example, the prepreg 18 in FIG. 1 may be omitted. The bias prepregs 12 and 13 may be 4 to 6 in total. In a normal case, it is preferable to laminate 3 to 5 prepregs in the straight direction, 2, 4 or 6 prepregs in the bias direction, and 1 to 3 prepregs in the hoop direction.

  In the above description, only the carbon fiber or the glass fiber is included in the prepreg, but other fibers such as silicon carbide fiber, alumina fiber, aromatic polyamide fiber, and boron fiber may be further blended.

1 golf club 2 head 3 shaft 4 grip 10 mandrel 11-22 prepreg

Claims (6)

It is formed by curing the wound prepreg,
In the golf club shaft in which a high specific gravity material having a higher specific gravity than the carbon fiber is distributed on the butt side of the golf club shaft,
A golf club shaft, wherein the high specific gravity material is distributed by winding a glass fiber-containing prepreg.   2. The golf club shaft according to claim 1, wherein the glass fibers are distributed in a straight direction and a hoop direction.   2. The golf club shaft according to claim 1, wherein the glass fiber is distributed only in the hoop direction.   4. The golf club shaft according to claim 1, wherein the glass fiber-containing prepreg is distributed in a range of 15 to 45% of a total length of the shaft from the butt side. 5.   5. The golf club shaft according to claim 1, wherein the golf club shaft is a wood club golf club shaft, and the total weight of the glass fibers is 2 to 6 g.   A golf club having the golf club shaft according to claim 1.

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