JP2002191735A - Golf shaft, molding method thereof, and golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club excellent in design which is lightweight, has high crushing strength and torsional strength, can prevent delamination between layers, has a three-dimensional depth, and is excellent in design, and a molding method thereof. Provide golf clubs. SOLUTION: A golf shaft obtained by firing a plurality of layers of fiber prepreg, wherein the shaft comprises a main layer 1 made of a high-strength high-elastic fiber impregnated with a synthetic resin;
The metal wire layers 2 and 4 laminated on the main body layer 1 and the low elastic fiber layer 5 impregnated on the metal wire layers 2 and 4 with a synthetic resin capable of seeing through the lower metal wire layer were laminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a golf shaft, a method for molding the same, and a golf club.

[0002]

2. Description of the Related Art In general, a golf shaft is formed by winding a filament (filament winding method) obtained by impregnating a resin into a high-strength high-elastic fiber or a prepreg (sheet winding method) formed into a sheet by aligning the filament and firing. In this case, it has both moderate bending and high rigidity. Further, by using carbon fiber as the high-strength high-elastic fiber, a golf shaft having high strength and light weight can be obtained, and golf clubs using the same have been used by a wide range of users.

[0003] Golf shafts using carbon fibers have bending stiffness (bending strength) depending on the modulus of elasticity of the fibers used, the direction of the arranged fibers with respect to the mandrel axis, the position of the fibers with respect to the entire length or the radial direction. Strength), torsional strength, crushing strength, and the like. Since the strength characteristics of such a golf shaft have a great effect on the flight distance and directionality of a hit ball as a golf club completed by attaching a head and a grip, development of a golf shaft according to the purpose is active. It has been done. In recent years, in order to obtain characteristics that can not be satisfied only with carbon fiber, for example, metal wires such as boron and titanium are arranged over the entire length to improve the transmission of vibration at impact, and the bending strength and There are many golf shafts formed by combining various materials with carbon fibers, such as arranging a metal wire as reinforcement at a head mounting position having low torsional strength.

On the other hand, in recent years, in addition to strength characteristics, golf shafts are required to have a metallic color from the viewpoint of aesthetics to impart a unique color sensation. The number of golf shafts with metal or metal deposited is increasing. However, such decoration techniques such as metallic painting and vapor deposition can simply cause a metal color to appear on the surface, but it is difficult to express a three-dimensional appearance with depth. Also, by simply arranging the above-mentioned metal wires such as titanium by simply arranging them on the surface of the golf shaft, it is possible to express the metal color, but not only is the increase in weight inevitable,
It becomes difficult to obtain ideal strength characteristics.

That is, the golf shaft is structurally
The closer to the outer layer, the greater the influence on the bending strength. However, since a metal wire having a generally circular cross-section occupies a large amount in the thickness direction, ideal strength characteristics (particularly, in terms of weight ratio strength) Bending strength). In addition, since the metal wires are arranged near the surface having a larger diameter than the inner layer conventionally arranged to ensure visibility, more metal wires must be used than when the metal wires are arranged in the inner layer. In addition, since a metal wire that is heavier than carbon fibers is used, the weight of the golf shaft as a whole inevitably increases. Furthermore, since the metal wire has poor adhesion and is liable to cause peeling, the amount of the synthetic resin that solidifies the metal wire to prevent the metal wire increases, and the weight of the entire golf shaft increases.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a lightweight and high crushing strength and torsional bending strength. , Can prevent delamination between layers,
Moreover, it is an object of the present invention to provide a golf shaft having a three-dimensional depth and excellent in design, a molding method thereof, and a golf club.

[0007]

The technical measures taken by the present inventor to achieve the above object are as follows.
The golf shaft according to claim 1, wherein the golf shaft is obtained by firing a plurality of layers of fiber prepreg, wherein the shaft is made of a high-strength high-elastic fiber impregnated with a synthetic resin, and A metal wire layer laminated on the
A low-elasticity fiber layer impregnated with a synthetic resin capable of seeing through a lower metal wire layer is laminated on the metal wire layer.

A golf shaft according to a second aspect of the present invention is the golf shaft according to the first aspect, wherein the metal wire layer is a metal wire layer in which the metal wires are arranged in the bias direction with respect to the axis of the main body layer. I do.

According to a third aspect of the present invention, there is provided the golf shaft according to the first or second aspect, wherein the metal wire layer comprises
A first metal wire layer in which metal wires are arranged at intervals in the bias direction with respect to the axis of the main body layer and a translucent material having a predetermined thickness is coated on the first metal wire layer. The light-transmitting layer includes: a light-transmitting layer; and a second metal line layer arranged on the light-transmitting layer at a distance from each other while aligning the metal wires in a bias direction opposite to that of the first metal wire layer.

The golf shaft according to a fourth aspect of the present invention is the golf shaft according to the third aspect, wherein the first metal wire layer, the second metal wire layer, or both of the metal wires forming the two metal wire layers are flat metal wires. I do.

According to a fifth aspect of the present invention, in the golf shaft of the first to fourth aspects, the low elasticity fiber layer constituting the outermost layer of the shaft is formed of a glass fiber prepreg.

According to a sixth aspect of the present invention, in the golf shaft according to the third to fifth aspects, the light-transmitting layer has a thickness of 10 μm to 100 μm.

A golf shaft according to a seventh aspect of the present invention is the golf shaft according to any one of the third to sixth aspects, wherein the light-transmitting layer is a glass fiber prepreg impregnated with a synthetic resin of the same quality as the synthetic resin used for the main body layer. Constitute.

In a golf shaft according to an eighth aspect of the present invention, in the golf shaft according to the second to seventh aspects, the metal wires are arranged at intervals of 0.5 to 2 times the line width.

According to a ninth aspect of the present invention, in the golf shaft according to the first to eighth aspects, a metal wire layer is provided.
It is arranged and formed at a position deviated toward the grip mounting portion in the entire length of the golf shaft.

According to a tenth aspect of the present invention, in the golf shaft of the third to eighth aspects, the first metal wire layer and the second metal wire layer are located at positions deviated toward the grip mounting portion in the entire length of the golf shaft. Arrange and form.

In the golf shaft according to the eleventh aspect, in the golf shaft according to the third to eighth aspects, the first metal wire layer and the second metal wire layer are located at positions offset toward the head mounting portion in the entire length of the golf shaft. Arrange and form.

A golf shaft according to a twelfth aspect of the present invention is the golf shaft according to the first aspect, wherein the metal wire layer is a metal wire layer in which flat metal wires are arranged in a circumferential direction with respect to the axis of the main body layer. The metal wire layer is arranged and formed at a position deviated toward the grip mounting portion in the entire length of the golf shaft.

According to a thirteenth aspect of the present invention, in the golf shaft of the first aspect, the metal wire layer is a metal wire layer in which flat metal wires are arranged in a circumferential direction with respect to the axis of the main body layer. The metal wire layer is arranged and formed at a position deviated toward the head mounting portion in the entire length of the golf shaft.

A golf shaft according to a fourteenth aspect of the present invention is the golf shaft according to the first aspect, wherein the metal wire layer is a metal wire layer in which flat metal wires are arranged in the axial direction of the main body layer. Further, the metal wire layer is arranged and formed at a position deviated toward the head mounting portion in the entire length of the golf shaft.

According to a fifteenth aspect of the present invention, in the golf shaft according to the first aspect, the metal wire layer is constituted by a metal wire layer in which flat metal wires are arranged in the axial direction of the main body layer. In addition, the metal wire layer is arranged and formed at a position deviated toward the grip mounting portion in the entire length of the golf shaft.

A golf club according to a sixteenth aspect uses the golf shaft according to the first to fifteenth aspects, wherein a head is fitted and fixed to one end of the shaft, and a grip is attached to the other end. The metal wire layer is disposed at an exposed position between the head and the grip.

A golf shaft molding method according to claim 17, wherein a high strength and high elastic fiber impregnated with a synthetic resin is wound around a tapered mandrel to form a main body layer; On the large diameter side, a step of winding the first glass prepreg on which the metal wires are aligned and affixed so that the metal wires are located inside, and aligned on the first glass prepreg with an interval therebetween. And winding the second glass prepreg in which the flat metal wire is attached to the glass fiber prepreg such that the flat metal wire is located inside.

Further, in the method of molding a golf shaft according to claim 18, a step of winding a high-strength high-elastic fiber impregnated with a synthetic resin around a tapered mandrel to form a main body layer; On the upper large diameter side, a step of winding a laminated sheet in which the aligned metal wires are sandwiched between a prepreg made of the same material as the main body layer and a glass fiber prepreg such that the glass fiber prepreg is located outside, On the laminated sheet, a step of winding a second glass prepreg in which a flat metal wire aligned and spaced apart from each other on a glass fiber prepreg is wound such that the flat metal wire is located inside, Is to include.

A golf shaft molding method according to a twelfth aspect of the present invention is a method of forming a main body layer by winding a high-strength high-elastic fiber impregnated with a synthetic resin around a tapered mandrel. On the large diameter side, a step of winding a laminated sheet in which the aligned metal wires are sandwiched between a prepreg made of the same material as the main body layer and a glass fiber prepreg such that the glass fiber prepreg is positioned outside, A step of winding a glass sheet in which flat metal wires arranged and aligned at an interval from each other are sandwiched between two glass fiber prepregs on the bonded prepreg.

[0026] In the method of molding a golf shaft according to the present invention, the fiber prepreg is wound around a mandrel, and after firing, the molding surface is polished to obtain a fiber reinforced shaft. In the surface layer to be polished, prepregs of fibers having partially different elastic moduli are appropriately arranged, and after firing, the surface of the molded shaft is uniformly polished to partially change the bending rigidity of the shaft. .

According to a twenty-first aspect of the present invention, in the molding method of the twenty-second aspect, the prepreg to be wound around the surface layer is a low-elasticity prepreg partially disposed with respect to the prepreg of the high-elasticity fiber. After firing,
It is to make the bending rigidity of the portion where the low elasticity prepreg is disposed relatively higher than that of the other portions by uniformly polishing the whole.

[0028] In the method of molding a golf shaft according to a twenty-second aspect, in the molding method of the twenty-first aspect, the low elasticity prepreg is a glass fiber prepreg.

Furthermore, in the method of molding a golf shaft according to the twenty-third aspect, in the molding method of the twenty-second aspect, at least a metal fiber layer is disposed immediately below the low elastic prepreg made of the glass fiber prepreg. In

[0030]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which a golf club C and a part of a golf shaft S used in the golf club C are enlarged. FIG. 2 is an enlarged sectional view showing a part of the golf shaft S in FIG. In this golf club C, a head H is fitted and fixed to a small-diameter end of a tapered golf shaft S, and a grip G is attached and fixed to a predetermined region from the large-diameter end.

In the golf shaft S used in the golf club C, the main layer 1 is mainly composed of high-strength and high-elastic fibers impregnated with a synthetic resin. Are laminated, and a low-elasticity fiber layer impregnated with a synthetic resin capable of seeing through the metal wire layer is further laminated on the metal wire layer. As the high-strength high-elastic fiber, carbon fiber or glass fiber is mainly used, and boron fiber, aramid fiber, PBO fiber or the like is also partially used. Further, as the synthetic resin, for example, a thermosetting synthetic resin such as an epoxy resin, a phenol resin, and an unsaturated polyester is used.

The golf shaft S according to the present invention is arranged so that the metal wires 6 and 7 can be visually recognized from a certain area on the main body layer 1. The metal wires 6 and 7 are stacked and arranged in the radial direction of the golf shaft S, and constitute at least a first metal wire layer 2 (lower layer) and a second metal wire layer 4 (upper layer). A light transmitting layer 3 made of a light transmitting material is interposed between the first metal line layer 2 and the second metal line layer 4 so that the lower metal line 6 can be visually recognized from the outside. Has become. On the second metal wire layer 4, a protective layer 5 made of the same material as the light transmitting layer 3 is formed. That is, the light-transmitting layer 3 having a predetermined thickness covers the lower first metal line layer 2, and the second metal line layer 4 and the protective layer 5 are provided on the light-transmitting layer 3.

Each of the metal wire layers 2 and 4 is composed of metal wires 6 and 7 aligned in a bias direction of 10 ° to 80 ° with respect to the shaft axis, and includes a first metal wire layer 2 and a second metal wire layer. 4 are arranged so as to be opposite to each other. At least the metal wire 7 used for the second metal wire layer 4 is desirably a flat plate. The flat metal wire 7 is formed by, for example, rolling a linear metal having a circular cross section into a flat shape. The flat metal wires 7 are arranged at a predetermined interval from each other, and the gap 9 allows the lower first metal wire layer 2 to be visually recognized.

As the metal wires 6 and 7, titanium, aluminum, stainless steel, an amorphous alloy, or the like is used. Titanium is preferably used from the viewpoints of weight, strength, and glitter (color). The translucent material is, for example, a synthetic resin such as a transparent or translucent epoxy resin, or a glass fiber impregnated with the resin, and the like. It is preferable to use a synthetic resin of the same quality as the synthetic resin used for the main body layer 1 or a glass fiber impregnated with the same in order to prevent peeling of the main layer.

The golf shaft S constructed as described above
Since the flat metal wire 7 is disposed on the second metal wire layer 4, the surface area that can be visually recognized increases, and the ratio occupied in the radial direction of the golf shaft S, that is, the thickness can be reduced.
In addition, since the flat metal wires 7 can be fixed with a small amount of synthetic resin, and since the flat metal wires 7 are arranged at a predetermined interval from each other, the synthetic resin of the protective layer 5 is melted. The gap 9 is integrated with the synthetic resin of the light transmitting layer 3. Thereby, the adhesion of the second metal wire layer 4 can be increased, and separation between the layers can be prevented.

Further, as shown in FIG. 3, the metal wire 6 used for the first metal wire layer 2 can be formed in a flat plate shape. In this case, since the thickness of the first metal wire layer 2 is reduced, not only can the degree of freedom of the diameter of the golf shaft S be increased, but also the amount of synthetic resin used can be suppressed.

The flat metal wires 7 of the second metal wire layer 4,
The lower first metal wire layer 2 can be visually recognized through the light transmitting layer 3 from the gap 9 formed between the first metal wire layer 2 and the second metal wire layer 2 aligned in opposite directions. 4 and a lattice pattern is visually recognized. Moreover, since the light-transmitting layer 3 is formed between the first metal wire layer 2 and the second metal wire layer 4, the thickness of the light-transmitting layer 3 depends on the thickness of the first metal wire layer 2 and the second metal wire layer 4. It is possible to have depth in between, and to give the viewer a three-dimensional effect. Here, as the thickness of the translucent layer 3 increases, the three-dimensional appearance increases, but the weight of the entire golf shaft S also increases. , 10 μm to 10
It is preferably 0 μm.

In order to improve the visibility of the first metal wire layer 2 and the visibility of the flat metal wire 7, each flat metal wire 7, 7 has a line width 8 of 0.5. It is preferable to form the gap 9 at intervals of about 2 times to 2 times. Further, the metal wires 6 of the first metal wire layer 2 may be densely aligned so as not to leave a gap. Forming a complex pattern combining the main body layer 1, the first metal wire layer 2, and the second metal wire layer 4 by adjusting the line width 8 and the gap 9 between the flat metal wires 7; Can also. In this case, the synthetic resin used for the light-transmitting layer 3 is in close contact with the synthetic resin used for the main body layer 1 through the gap 8 between the metal wires 6 and 6.
The peeling of the first metal wire layer 2 can also be prevented.

It is desirable that these metal wire layers 2 and 4 are formed so as to be biased toward the grip mounting portion g in the entire length L of the golf shaft S. Thereby, the metal wires 6 and 7 are attached to the large diameter side of the entire length L of the tapered golf shaft S.
And the metal wires 6 and 7 are aligned in the bias direction, so that the crushing strength can be improved. In addition, since the metal wire layers 2 and 4 are partially formed, an increase in weight can be suppressed as compared with the case where the metal wire layers 2 and 4 are arranged over the entire length L. Also,
When the head H and the grip G are attached to the golf shaft S to form a golf club C, the grip G may partially cover the metal wire layers 2 and 4, but at least the head H and the grip G It is preferable that the metal wires 6 and 7 are arranged in a region exposed between them, and are arranged so as to be visible to a user. Thereby, the golf shaft S can be provided with high strength, and the user of the golf club C can easily recognize the metal wire layers 2 and 4 having the three-dimensional depth.

Further, the metal wire layers 2 and 4 may be formed so as to be biased toward the head mounting portion h in the entire length L of the golf shaft S as shown in FIG. In this case, the metal wires 6, 7 are present on the smaller diameter side of the entire length L of the tapered golf shaft S, and the metal wires 6, 7 are aligned in the bias direction. Strength and impact strength can be improved. In addition, since the metal wire layers 2 and 4 are partially formed, an increase in weight can be suppressed as compared with the case where the metal wire layers 2 and 4 are arranged over the entire length L. When the head H and the grip G are attached to the golf shaft S to form a golf club C, the head H may partially cover the metal wire layers 2 and 4, but at least the head H and the grip G It is preferable that the metal wires 6 and 7 are arranged in a region exposed between them and are arranged so as to be visible to a user. This allows the golf shaft S to have high strength,
The user of the golf club C can easily recognize the metal wire layers 2 and 4 having the three-dimensional depth.

Further, when the metal wire layers 2 and 4 are formed so as to be deviated toward the grip mounting portion g in the entire length L of the golf shaft S as shown in FIG. A configuration in which the metal wires are aligned in the circumferential direction (perpendicular to the axis) with respect to the axis of the main body layer may be employed. In this case, since the flat metal wires constituting the metal wire layer are arranged in the circumferential direction, the crushing strength can be increased as in the case where the metal wires are arranged in the bias direction.

FIGS. 16 and 17 show the metal wire constituting the metal wire layer when the metal wire layer is arranged at a position deviated toward the head mounting portion h in the entire length of the golf shaft, similarly to FIG. FIG. 1 shows another example of the winding form of FIG.
Reference numeral 6 denotes a form in which the flat metal wires are aligned in the circumferential direction (perpendicular to the axis) with respect to the axis of the main body layer, and FIG. 17 shows a form in which the flat metal wires are aligned in the axial direction of the main body layer. In this case, bending rigidity and bending strength can be enhanced.

Next, a specific example of the molding process of the above-described golf shaft will be described. FIG. 4 is a diagram illustrating an example of a molding process of the golf shaft S, and illustrates a procedure in a case where the prepreg is wound around the mandrel M by a sheet winding method. The case where the main prepreg P1 used here is mainly a carbon fiber prepreg will be described. The main prepreg P1 includes a prepreg (straight layer) whose fiber direction is along the axis O of the mandrel M, a prepreg (hoop layer) perpendicular to the axis O of the mandrel M, and an axis O of the mandrel M. A prepreg (bias layer) inclined with respect to is appropriately and selectively used depending on the characteristics to be obtained.

As shown in the drawing, first, a tip auxiliary prepreg P is attached to a tapered mandrel M as required.
2, and a bias prepreg (main prepreg P <b> 1) whose fiber direction is inclined with respect to the axis O of the mandrel M is entirely wound thereon. This tip auxiliary prepreg P2 and bias prepreg (main prepreg P1)
The mandrel M is wound around a predetermined region excluding the small-diameter side end region A1 and the large-diameter side end region A2. The bias prepreg P1 is formed by laminating and bonding two prepregs whose fiber directions are opposite to each other and winding about 4 to 8 plies. Then, although not shown, a straight prepreg whose fiber direction is along the axis O is wound on the whole from above. From above, the tip auxiliary prepreg P2 for adjusting the tone and adjusting the outer diameter is wound on the tip side, and the fiber direction is appropriately selected and used according to the desired characteristics. Thus, the main body layer 1 is formed.

Next, the first glass prepreg P3 is wound around the main layer 1 at a position deviated to the large diameter side. As shown in FIG. 5, the first glass prepreg P3 is obtained by sticking a titanium wire (metal wire 6) aligned in the bias direction to a glass fiber prepreg Pg, and the titanium wire 6 is placed inside (the body layer 1 side). ). Thereby, the first metal line layer 2 and the light transmitting layer 3 are formed at the same time.

By the way, the first glass prepreg P3 is
It is wound on the body layer 1 at a position biased toward the large diameter side.
The finished golf shaft S has a grip G attached to its large diameter end. This grip mounting part g
When the metal wires 6 and 7 are disposed on the golf shaft S, the metal wires 6 and 7 are hidden by the grip G and have no meaning in appearance. It will be bulky. On the other hand, metal wires 6, 7
Is wound, the cut ends of the metal wires 6 and 7 appear remarkably due to the boundary between the winding ends of the metal wires 6 and 7 and the lower body layer 1, which is not preferable in appearance. for that reason,
A part of the metal wires 6 and 7, that is, the ends of the metal wires 6 and 7
It is preferable that the first glass prepreg P3 be wound so as to be concealed by a grip to be mounted later, preferably with a space W of about 230 mm to 280 mm from the large-diameter end of the main body layer 1. Good.

Next, the second glass prepreg P4 is wound on the first glass prepreg P3. As shown in FIG. 5, the second glass prepreg P4 is formed by laminating a plate-shaped titanium wire 7 at a distance from each other in the bias direction and affixing the plate-shaped titanium wire 7 on the glass fiber prepreg Pg. It is wound so that it is located in. Thereby, the second metal wire layer 4 and the protective layer 5 are formed simultaneously. Then, a wrapping tape made of a heat-shrinkable resin is wound thereon, fired in a firing furnace, and after firing, the golf shaft S is formed by performing decentering, surface polishing, painting and the like of the mandrel M. (Not shown).

By molding the golf shaft S in this manner, the first metal wire layer 2 and the light transmitting layer 3 and the second metal wire layer 4 and the protective layer 5 are simultaneously formed. In addition, the efficiency of the molding process can be improved, and the golf shaft S that is lightweight, has high crushing strength and torsional strength, and has a three-dimensional depth and is excellent in design can be easily formed.

By the way, as described above, the golf shaft S
In the case where is formed, there is a difference in outer diameter between the portion where the metal wires 6 and 7 are arranged and the main body layer 1 on the smaller diameter side, and a step is generated. Also, as described above, the metal wires 6, 7 are also provided at the small-diameter end portions of the metal wire layers 2, 4.
Is remarkable at the boundary with the lower main body layer 1 and is not preferable in appearance. Therefore, as shown in FIG. 6, after the second metal wire layer 4 and the protective layer 5 are formed, the outer shape made of the carbon fiber prepreg extends from the portion where the metal wires 6 and 7 are arranged to the main body layer 1 on the smaller diameter side. Winding the auxiliary prepreg P5,
The surface may be polished after firing. This makes it possible to smooth a step formed between the metal wire layers 2 and 4 and the main body layer 1 and to cover and hide the ends of the metal wires 6 and 7, resulting in an excellent appearance. .

Although the molding example of the golf shaft S in the present invention has been described above, the present invention is not limited to the above-described molding method. For example, as shown in FIG. 7, the first glass prepreg (sheet) P3 is formed by sandwiching a titanium wire 6 between a carbon fiber prepreg Pc and a glass fiber prepreg Pg, and the carbon fiber prepreg Pc
May be wound with the main body layer 1 side (the glass fiber prepreg Pg is on the outside) to form the first metal wire layer 2 and the light transmitting layer 3. Golf shaft S formed by this
As shown in FIG. 8, the carbon fiber prepreg Pc of the first glass prepreg P3 is integrated with the main body layer 1, and the first metal wire layer 2 and the light transmitting layer 3 are simultaneously formed.

As shown in FIG. 9, the first glass prepreg P3 or the second glass prepreg P4 is made of a titanium wire 6 or a flat titanium wire 7 aligned in the bias direction with two glass fiber prepregs Pg and Pg. You may make it comprise with what was pinched. As shown in FIG. 10, the formed golf shaft S has the first metal wire layer 2 and the light transmitting layer 3 or the second metal wire layer 4 and the protective layer 5 formed at the same time. The part 1 of the main body layer 1 and the light-transmitting layer 3 or the light-transmitting layer 3 and the protective layer 5 are integrated, so that adhesion can be enhanced and separation between layers can be prevented. As described above, the first glass prepreg P3 or the second glass prepreg (glass sheet) P4 is formed and wound on the main body layer 1 or the light transmitting layer 3 to have a higher elastic modulus than carbon fiber or glass fiber. It is possible to easily wind the metal wire 6 or the flat metal wire 7 that is difficult to wind.

Of course, both the first glass prepreg P3 and the second glass prepreg P4 are made of glass sheets having the same configuration in which a metal wire is sandwiched between two glass fiber prepregs, and one of them is turned upside down to turn the metal wire in the opposite direction. It is also possible to use the same sheet, which leads to a reduction in material cost because the same sheet can be used.

Further, it is not necessary to arrange all the metal wires at equal intervals. As shown in FIG. 12, the metal wires 6 and 7 are provided on the main body layer 1 with a predetermined pattern at the intervals at which the metal wires 6 and 7 are arranged. It is also possible to give a degree of freedom to the pattern composed of the above, and as shown in FIG. 13, the glass fiber prepreg to which the aligned metal wires (flat metal wires) 6, 7 are attached is biased in the reverse direction. The layers may be appropriately laminated in the bias direction and the straight direction, and may be arranged in the triaxial direction. In this case, since the metal wires (flat metal wires) 6 and 7 are arranged in the straight direction, the bending strength is improved, and the vibration is easily transmitted, so that the shot feeling as a golf club is improved. You can also.

In the above-described example, an example (sheet winding method) in which the main body layer 1 is formed by a sheet-like prepreg obtained by solidifying high-strength high-elasticity fibers (carbon fibers) with a synthetic resin has been described. Is not limited to the above embodiment. For example, as shown in FIG. 11, the main layer 1 is formed by a filament winding method in which a filament F impregnated with a synthetic resin is wound around a mandrel M.
May be formed.

In the above-described golf shaft molding method, the molding material (prepreg, filament, or the like) is wound around the mandrel M and fired. And a polishing step of polishing the surface of the molded shaft. Specifically, a certain amount of shaving allowance is provided on the shaft from the initial design stage (bending stiffness is set high), and the method of shaving off the surface fiber eliminates wrapping marks and simultaneously adjusts the bending stiffness to the design value. Prepare. In this polishing step, even if the same amount of chips is cut off, the higher the modulus of elasticity of the fiber to be cut off, the lower the bending rigidity due to polishing greatly, and the lower the modulus of elasticity of the fiber, the lower the bending rigidity due to cutting off by polishing. Little change.

The present invention pays attention to this configuration, and devises that the distribution of bending stiffness is partially controlled by the change in stiffness generated by polishing due to the difference in the elastic modulus of the fibers used. . Specifically, a prepreg (low-elasticity prepreg) using fibers having a low elastic modulus is partially disposed on the surface of a shaft to be molded, and the entire shaft is uniformly polished (from the surface). If the shaving depth is made substantially constant), after the polishing, the bending stiffness of the portion covered with the prepreg using the fiber having a low elastic modulus becomes relatively higher than other portions. That is,
The same effect can be obtained as in the case of reinforced (increased bending rigidity) with a prepreg using expensive high-modulus fibers.

Examples of the low elasticity prepreg include a low elasticity carbon fiber prepreg in addition to a glass fiber prepreg. In particular, the glass fiber prepreg has an elastic modulus of only 1/3 of that of ordinary carbon fiber, and the difference is further increased when a woven fabric (cloth) woven in a lattice is used. The effect of the change in rigidity due to polishing can be sufficiently exhibited.

Further, by disposing the above-mentioned metal wire under the above-mentioned low elasticity glass fiber prepreg, texture such as metallic luster of the metal wire is exhibited through the glass fiber prepreg, and a visual effect is exerted. Is done.

This will be described with reference to, for example, the laminated structure of the forming step shown in FIG. 4. The bias prepreg (main prepreg P1) made of carbon fiber prepreg and the main layer 1 composed of the straight prepreg are arranged on the large diameter side outside the main layer 1. Wind the first glass prepreg P3 on the biased position,
Further, the second glass prepreg P4 is laminated and wound on the first glass prepreg P3. The first glass prepreg P3 is obtained by affixing a titanium wire 6 (metal wire) aligned in the bias direction to a glass fiber prepreg Pg, and the titanium wire 6 is located inside (the body layer 1 side). And wind it up. Similarly to the first glass prepreg P3, the second glass prepreg P4 is connected to the glass fiber prepreg Pg by a flat titanium wire 7 aligned in the bias direction.
(Metal wire), and the flat titanium wire 7
Is wound inside (the glass fiber prepreg Pg side of the first glass prepreg P3).

Thus, the metal wires of the titanium wire 6 and the flat titanium wire 7 are stacked and arranged on the large diameter side of the main body layer 1 made of the carbon fiber prepreg, and are placed on the metal wire (flat titanium wire). Glass fiber prepregs Pg are stacked and arranged. Accordingly, the wrapping tape is wound from the upper surface of the main body layer 1 on the smaller diameter side to the glass fiber prepreg Pg of the second glass prepreg P4 on the larger diameter side. Therefore, in the polishing process after firing, when the entire length of the formed shaft is uniformly cut off at a depth where the trace of the wrapping tape disappears as shown in FIG. 18 (the polishing depth is represented by a one-dot chain line), Tier 1
Is exposed, the carbon fiber of the high elasticity fiber is scraped off, and the portion on which the second glass prepreg P4 on the large diameter side is wound is the surface of the low elasticity fiber on the surface side while leaving the flat titanium wire 7 (metal wire). The glass fiber prepreg Pg is scraped off.

Thus, after polishing, the bending rigidity of the portion on the large diameter side covered with the prepreg having a low elastic modulus (second glass prepreg P4) becomes relatively higher than the other portions.
Then, through the glass prepreg, the titanium wire 6 and the flat titanium wire 7 disposed thereunder are seen through, and the design effect is enhanced. That is, the above-described molding method simultaneously satisfies both the functional aspect of controlling the bending rigidity and the visual aspect of developing a texture such as metallic luster through a glass prepreg, and they are closely emphasized. Together, they offer unprecedented advantages. Also, by using a flat metal wire as the metal wire, the glass / metal prepreg can be made thinner, and a stronger metallic texture can be exhibited, and at the same time, the amount of metal and synthetic resin used can be reduced. It can also contribute greatly to weight reduction.

[0062]

As described above, according to the present invention, a golf shaft which is lightweight, has high crushing strength and torsional strength, can prevent delamination between layers, and has a three-dimensional depth and is excellent in design is provided. It can be formed efficiently and easily. In addition, it is possible to provide a golf shaft and a golf club which are lightweight, have high crushing strength and torsional strength, can prevent peeling between layers, and have a three-dimensional depth and are excellent in design. Further, by disposing the low elasticity fiber on the outermost side of the shaft, the distribution of the bending rigidity of the shaft can be changed. Further, the stability of strength can be improved.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view showing a golf club C according to the present invention and a part of a golf shaft S used in the golf club C. FIG.

FIG. 2 is a sectional view showing a part of the golf shaft S in FIG. 1 in an enlarged manner.

FIG. 3 is a sectional view showing another embodiment in FIG. 2;

FIG. 4 is a view showing an example of a molding process of a golf shaft according to the present invention.

5 shows a configuration of a prepreg used in the molding method of FIG. 4, wherein (A) is a cross-sectional view showing a first glass prepreg, and (B) is a cross-sectional view showing a second glass prepreg.

FIG. 6 is a view showing another example of a molding step.

FIG. 7 is a sectional view showing another embodiment of the first glass prepreg.

FIG. 8 is a sectional view of a shaft using the prepreg shown in FIG. 7;

FIG. 9 is a diagram showing another embodiment in FIG. 5;

10 is a cross-sectional view of a shaft using the prepreg shown in FIG.

FIG. 11 is a view showing another example of the molding of FIG. 4;

FIG. 12 is a diagram showing another example of the partially enlarged view in FIG. 1;

FIG. 13 is a diagram showing another example of the partially enlarged view in FIG. 1;

FIG. 14 is a perspective view showing a golf club C in which a metal wire layer (bias direction) is biased toward the head.

FIG. 15 is a perspective view showing a golf club C in which a metal wire layer (circumferential direction) is biased toward a grip side.

FIG. 16 is a perspective view showing a golf club C in which a metal wire layer (circumferential direction) is arranged on the head side.

FIG. 17 is a perspective view showing a golf club C in which a metal wire layer (axial direction) is biased toward the head.

FIG. 18 is an explanatory diagram illustrating a polishing step after firing.

[Explanation of symbols]

C: Golf club D: Thickness F: Filament G: Grip g: Grip mounting part H: Head M: Mandrel P1: Main prepreg P2: Tip auxiliary prepreg P3: First glass prepreg P4: Second glass prepreg P5: Outline auxiliary Prepreg Pg Glass fiber prepreg Pc Carbon fiber prepreg S Golf shaft W Interval 1 Body layer 2 First metal layer 3 Translucent layer 4 Second metal layer 5 Protective layer 6 Metal wire 7 Flat plate Metal wire 8 ... Line width 9 ... Gap

Claims (23)

[Claims] 1. A golf shaft obtained by firing a plurality of layers of fiber prepreg, wherein the shaft has a main layer made of high-strength and high-elastic fibers impregnated with a synthetic resin, and is laminated on the main body layer. A golf shaft, comprising: a metal wire layer; and a low elastic fiber layer impregnated with a synthetic resin capable of seeing through a lower metal wire layer on the metal wire layer. 2. The metal wire layer laminated on the main body layer comprises a metal wire layer in which metal wires are arranged in a bias direction with respect to the axis of the main body layer. The golf shaft of the above. 3. A first metal wire layer in which a metal wire layer laminated on the main body layer is arranged with metal wires arranged in a bias direction with respect to an axis of the main body layer at intervals in a bias direction; A light-transmitting layer formed by coating a light-transmitting material having a predetermined thickness on one metal wire layer, and aligning the metal wires on the light-transmitting layer in a bias direction opposite to that of the first metal wire layer; The golf shaft according to claim 1, comprising a second metal wire layer spaced apart from each other. 4. The golf shaft according to claim 3, wherein the metal wire constituting the first metal wire layer, the second metal wire layer, or both layers is a flat metal wire. 5. The low-elasticity fiber layer is formed of a glass fiber prepreg.
The golf shaft according to claim 1. 6. The light-transmitting layer according to claim 3, wherein said light-transmitting layer has a thickness of 10 μm to 100 μm.
The golf shaft according to any one of the preceding claims. 7. The light-transmitting layer according to claim 3, wherein the light-transmitting layer is formed of a glass fiber prepreg impregnated with a synthetic resin of the same quality as the synthetic resin used for the main body layer. The golf shaft according to claim 1. 8. The metal wires may have a mutual width of 0.5 times or more.
The golf shaft according to any one of claims 2 to 7, wherein the golf shaft is arranged at twice the interval. 9. The golf shaft according to claim 1, wherein the metal wire layer is formed at a position deviated toward the grip mounting portion in the entire length of the golf shaft. 10. The golf ball according to claim 3, wherein the first metal wire layer and the second metal wire layer are formed at positions deviated toward the grip mounting portion in the entire length of the golf shaft. The golf shaft according to claim 1. 11. The golf club according to claim 3, wherein the first metal wire layer and the second metal wire layer are formed at positions deviated toward the head mounting portion in the entire length of the golf shaft. The golf shaft according to claim 1. 12. The metal wire layer comprises a metal wire layer in which flat metal wires are arranged in a circumferential direction with respect to the axis of the main body layer, and the metal wire layer is grip-mounted in the entire length of the golf shaft. The golf shaft according to claim 1, wherein the golf shaft is formed at a position deviated to the part side. 13. The golf club head according to claim 1, wherein the metal wire layer comprises a metal wire layer in which flat metal wires are arranged in a circumferential direction with respect to the axis of the main body layer, and the metal wire layer comprises a head mounting portion of the entire length of the golf shaft. The golf shaft according to claim 1, wherein the golf shaft is formed at a position deviated to the part side. 14. The metal wire layer includes a metal wire layer in which flat metal wires are arranged in the axial direction of a main body layer and arranged.
The golf shaft according to claim 1, wherein the metal wire layer is formed at a position deviated toward the head mounting portion in the entire length of the golf shaft. 15. The metal wire layer comprises a metal wire layer in which flat metal wires are arranged in the axial direction of the main body layer and arranged.
The golf shaft according to claim 1, wherein the metal wire layer is formed at a position deviated toward the grip mounting portion in the entire length of the golf shaft. 16. A golf club according to claim 1, wherein a head is fitted and fixed to one end of the golf shaft and a grip is attached to the other end. The golf club, wherein the layer is provided at a position exposed between the head and the grip. 17. A step of winding a high-strength high-elasticity fiber impregnated with a synthetic resin around a tapered mandrel to form a main body layer, and aligning a metal wire on the large diameter side of the main body layer. Winding the attached first glass prepreg such that the metal wire is positioned inside; and, on the first glass prepreg, affixing the plate-shaped metal wires aligned at intervals to each other on the glass fiber prepreg. Winding the attached second glass prepreg such that the flat metal wire is located inside. 18. A step of winding a high-strength high-elasticity fiber impregnated with a synthetic resin around a tapered mandrel to form a main body layer, and forming a metal wire aligned on the large diameter side of the main body layer. Winding a laminated sheet sandwiched between a prepreg made of the same material as the main body layer and a glass fiber prepreg so that the glass fiber prepreg is positioned outside; and aligning and aligning the laminated sheet at intervals on the laminated sheet. Winding a second glass prepreg obtained by attaching the flat metal wire to a glass fiber prepreg such that the flat metal wire is located inside. 19. A step of winding a high-strength high-elasticity fiber impregnated with a synthetic resin around a tapered mandrel to form a main body layer, and forming a metal wire aligned on the large diameter side of the main body layer. Winding a laminated sheet sandwiched between a prepreg made of the same material as the main body layer and a glass fiber prepreg so that the glass fiber prepreg is positioned outside; and pulling the laminated prepreg at an interval on the bonded prepreg. Winding a glass sheet in which the aligned flat metal wires are sandwiched between two glass fiber prepregs. 20. A method of forming a shaft in which a fiber prepreg is wound around a mandrel, baked and then polished on a molding surface to obtain a fiber-reinforced shaft. A method for forming a golf shaft, comprising: appropriately arranging prepregs of different fibers from each other, and after firing, uniformly polishing the surface of the formed shaft to partially change the bending rigidity of the shaft. 21. The prepreg to be wound around the surface layer portion has a low-elasticity prepreg arranged by partially arranging a low-elasticity prepreg with respect to a prepreg of a high-elasticity fiber, and after firing, uniformly polishing the whole. 3. The bending rigidity of a part is made relatively higher than other parts.
0. The method of molding a golf shaft according to item 0. 22. The method according to claim 21, wherein the low elasticity prepreg is a glass fiber prepreg. 23. The method according to claim 22, wherein at least a metal fiber layer is disposed immediately below the low elasticity prepreg made of the glass fiber prepreg.