JPH1085373A - Tubular parts for sports goods - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the strength from being lowered by winding the tubular parts for sports goods with both of a fiber-reinforced prepreg made by impregnating the reinforcement fibers with plastics and a metal fiber-reinforced prepreg made by impregnating the metal fibers having a specific average fiber diameter with plastics to average fiber diameter in the reinforced fibers. SOLUTION: As the tubular part for sports goods, for instance, a metal fiber-reinforced prepreg is arranged both on the tip 3 and taper 5 of a golf club shaft, by which a tenacity vs. flexibility is demonstrated upon swinging it to make it possible to reinforce the head's fixation, and simultaneously to withstand enough any external impact. This metal fiber-reinforced prepreg protects the reinforcement fibers of the fiber-reinforced prepreg in the further inner strata. With plastics 2, this metal fiber reinforced-prepreg is made by impregnating the metal fibers 1 that is pulled and aligned in a specific direction. The fiber diameter in the metal fibers 1 is set so as to be below nearly doubling the diameter in the reinforcement fibers for fiber reinforced prepreg.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular body for sports equipment used for golf equipment, fishing equipment, ski equipment, tennis equipment and the like.

[0002]

2. Description of the Related Art In recent years, fiber-reinforced prepregs have been used for tubular bodies used in sports equipment, for example, golf club shafts. For example, Tokuho 7
Japanese Patent Application Publication No. -90046 discloses that a carbon fiber reinforced prepreg and a metal fiber reinforced prepreg are used to approximate the vibration characteristics of a steel shaft without impairing the characteristics of the carbon shaft. In this case, the fiber diameter of the carbon fiber is 5 to 8 μm, and the fiber diameter of the metal fiber is 30 to 150 μm.

[0003] However, since the fiber diameter of the carbon fiber is very small relative to the fiber diameter of the metal fiber as described above, when the two fibers are combined to form a tubular body, the carbon fiber having a small fiber diameter becomes large in diameter. It is bent or crushed by metal fibers. Therefore, there is a problem that the strength of the tubular body is reduced with the breaking of the carbon fibers.

Further, since the metal fiber has a relatively large fiber diameter, if the thickness of the metal fiber reinforced prepreg is reduced, the amount of the metal fiber cannot be increased much (about 10% by weight or less in a predetermined layer). The vibration characteristics of the steel shaft cannot be brought close enough.

[0005] The present invention has been made in view of the above points, and an object of the present invention is to provide a tubular body for sports equipment which can prevent a decrease in strength and can make use of metal properties.

[0006]

SUMMARY OF THE INVENTION The present invention provides a fiber reinforced prepreg obtained by impregnating a reinforcing fiber with a synthetic resin, and a metal fiber having an average fiber diameter of about twice or less the average fiber diameter of the reinforcing fiber. A tubular body for sports equipment characterized by being wound using a metal fiber reinforced prepreg impregnated with a resin.

[0007]

Embodiments of the present invention will be specifically described below with reference to the drawings. The metal fiber reinforced prepreg used for the tubular body for sports equipment of the present invention is shown in FIG. This metal fiber reinforced prepreg is
It is made by impregnating a synthetic resin 2 into metal fibers 1 aligned in a specific direction. By using such a metal fiber reinforced prepreg, a structure having a layer made of metal fibers is obtained instead of a structure in which a metal wire is embedded in a prepreg layer constituting a tubular body.

As the material of the metal fiber 1, tungsten, brass, copper, aluminum, nickel, titanium, stainless steel, spring steel, shape memory alloy material and the like can be used. In addition, as the synthetic resin 2, a thermosetting resin such as an epoxy resin or a thermoplastic resin such as a polyetherimide resin can be used.

The fiber diameter of the metal fibers 1 is set to be approximately twice or less the fiber diameter of the reinforcing fibers of the fiber reinforced prepreg.
For example, when the reinforcing fiber is a carbon fiber, the fiber diameter of the carbon fiber is usually 5 to 9 μm. Therefore, the fiber diameter of the metal fiber 1 is set to 15 μm or less, preferably 10 μm or less.

Further, a metal such as gold, silver, chromium or nickel may be applied to the surface of the metal fiber 1 to improve the corrosion resistance and appearance of the tubular body. Here, as the reinforcing fibers of the fiber-reinforced prepreg, besides carbon fibers, glass fibers, aramid fibers, silicon carbide and the like can be mentioned. The synthetic resin used for fiber reinforced prepreg is
The same thing as the synthetic resin 2 of the said metal fiber reinforced prepreg can be used.

The thickness of the metal fiber reinforced prepreg is preferably 0.2 mm or less, particularly preferably 0.15 mm or less, in consideration of manufacturing conditions and design freedom. It should be noted that, since ultrafine metal fibers are used, those having a thickness of 0.1 mm or less can be easily manufactured. 0.1mm thick
By using the following metal fiber reinforced prepreg, it becomes easier to produce a laminate with higher precision. Also, when such a thin metal fiber reinforced prepreg is used, the step at the end of winding is reduced, and the difference in rigidity due to the overlapping margin is reduced, thereby preventing the directionality (warping).

In the above metal fiber reinforced prepreg,
Since the fiber diameter of the metal fiber 1 is set to be approximately twice or less the fiber diameter of the reinforcing fiber of the fiber-reinforced prepreg, the metal fiber-reinforced prepreg in the metal fiber-reinforced prepreg when the outer circumference of the metal fiber-reinforced prepreg makes one round is used. 20% by weight of metal fiber distribution
(10% by volume) or more, preferably 30% by weight (15% by volume) or more, more preferably 50% by weight (25% by volume) or more. In order to efficiently increase the weight ratio, it is preferable to use a material having a specific gravity of 5.0 or more, for example, a stainless steel fiber (specific gravity of about 7.8) or the like.

The distribution of metal fibers in the tubular body is at least 7% by weight (3% by volume), preferably 15% by weight.
(5% by volume) or more, more preferably 30 to 85% by weight
(10 to 60% by volume).

[0014] The amount of the metal fiber of the metal fiber reinforced prepreg is 5
When the content is 0% by weight or more, the physical properties of the metal in the tubular body can be sufficiently exhibited, and a decrease in the physical properties due to the synthetic resin (matrix), for example, a reduction in elasticity can be prevented. For this reason, the physical properties of the tubular body are similar to those in which a metal plate is placed inside, and the strength can be improved as compared to simply winding the metal plate around the tubular body.

When the metal fiber content of the metal fiber reinforced prepreg is in the range of 30 to 50% (volume ratio), the metal fiber exhibits the physical properties and adherence to the fiber reinforced prepreg having a resin impregnation rate of 30% by weight or less. It is possible to prevent peeling and to prevent the generation of voids.

When the metal fiber reinforced prepreg is disposed between the fiber reinforced prepregs having a low resin impregnation rate or in the innermost layer or the outermost layer, the amount of the metal fibers may be 30% by weight or less.

The volume ratio of the metal fibers in the metal fiber reinforced prepreg is as follows. When using metal fiber reinforced prepreg partially as reinforcing ears, etc.,
There is no particular limitation. When used in this manner, it is preferable to provide one or more turns in the circumferential direction.

When the metal fiber reinforced prepreg is used in at least one layer over the entire length, the volume ratio of the metal fibers in the tubular body is 3% or more, preferably 5% or more. If the volume ratio is 10% or more, the characteristics become closer to the steel shaft. Therefore, when the characteristics are made closer to the steel shaft, the volume ratio is set to be as large as possible.

FIG. 2 is a plan view showing a golf club shaft which is a tubular body for sports equipment of the present invention. The golf club shaft has a tip 3 for fixing the head, a small diameter portion 4 connected to the tip 3 and having a relatively small taper or straight shape on the tip 3 side, and a connection with the small diameter portion 4. The tapered portion 5 has a relatively large taper with a small diameter portion 4 side, and a large diameter portion 6 which is a grip portion connected to the tapered portion 5.

In the golf club shaft shown in FIG. 2, a metal fiber reinforced prepreg is disposed on the tip portion 3 and the tapered portion 5. By arranging the metal fiber reinforced prepreg on the tip portion 3, sticking is provided for the deflection at the time of swing, so that the fixation of the head can be reinforced and the impact from the outside can be sufficiently endured. Further, by disposing the metal fiber reinforced prepreg extending to the front (front end side) of the tapered portion 5, stress concentration at the taper change point is prevented, the torsion against bending is provided, and the strength is improved. be able to. Further, the metal fiber reinforced prepreg can protect the reinforcing fibers of the fiber reinforced prepreg of the inner layer.

By using the metal fiber reinforced prepreg, the vibration damping of the club shaft approaches that of the steel shaft. In addition, since the metal fibers are very thin compared to conventional ones, the amount of the metal fibers to be added and the fiber direction of the metal fibers can be easily controlled, so that the vibration characteristics of the club shaft can be easily adjusted. be able to.
Further, it is possible to improve the poor vibration transmission of the shaft made of the prepreg containing only the reinforcing fibers other than the metal fibers, and it is also possible to solve the disadvantage inherent to the steel shaft that the hand is vibrated in the event of an impact. Furthermore, the breakage of the reinforcing fibers of the prepreg constituting the main body layer can be prevented.

The metal fiber reinforced prepreg may be wound and disposed on any of the innermost layer, intermediate layer and outermost layer of each part. In particular, by arranging it on the outermost layer, external impact can be reduced. Further, a thin layer such as a synthetic resin layer, a film layer, a glass scrim layer, and a nonwoven fabric layer may be provided on at least one surface of the metal fiber reinforced prepreg. When the metal fiber reinforced prepreg is provided on the outermost layer, it is preferable to provide a protective layer thereon so that the metal fibers are not exposed. This protective layer is preferably made of a transparent material.

The metal fiber reinforced prepreg may be provided in a large tapered portion or a drawn portion other than the tip portion (head fixing portion) 3 or the tapered portion 5 as reinforcement. Further, by using a metal fiber reinforced prepreg in a layer inclined in the axial direction (circumferential direction) (for example, a layer composed of a prepreg in which fibers are aligned at approximately ± 45 ° with respect to the axial direction), torsional vibration characteristics Can approach the level of a steel shaft.

The metal fiber reinforced prepreg can be used not only for a club shaft but also for a club head (not shown). In this case, one or more layers may be provided only on the face of the club head, one or more layers may be provided on at least the area including the face, or one or more layers may be provided on the entire club head. good. By using the metal fiber reinforced prepreg for the club head in this way, a high hitting sound close to the metal head can be output instead of a low hitting sound with poor sound. Also, due to low vibration damping,
Vibration can be efficiently transmitted to the club shaft. Further, by using the metal fiber reinforced prepreg for both the club shaft and the club head, the effect can be further enhanced.

Further, the metal fiber reinforced prepreg can be disposed at the front, middle and base portions (grip portion) of the shaft for weight distribution. Further, the metal appearance can be obtained by disposing the metal fiber reinforced prepreg at a position where the appearance appears.

Next, a golf club shaft which is a tubular body for sports equipment of the present invention will be specifically described. FIG. 3 is a sectional view of the golf club shaft 10. The golf club shaft having such a sectional structure is shown in FIG.
In the mandrel 20 shown in the figure, the prepregs indicated by reference numerals 11 to 18 are sequentially wound separately, or the prepregs adjacent to each other are appropriately overlapped and wound,
After that, it is manufactured through a process such as fastening by taping, heat hardening, removal of a mandrel, removal of a tape, and polishing.

The line direction of each prepreg shown in FIG. 4 indicates the fiber direction, and the number of plies can be variously changed according to the application, required characteristics, and the like. Further, in FIG. 4, the basic main body layer is the A layer provided on the inner layer side.
P prepreg (prepreg obtained by impregnating a synthetic resin into reinforcing fibers aligned in a direction inclined with respect to the axial direction) 13;
SP prepreg (prepreg in which reinforcing fibers impregnated in the axial direction are impregnated with a synthetic resin) disposed on the outer layer side
6.

Hereinafter, the golf club shaft shown in FIG. 3 will be described in the order of the prepreg to be wound.
In FIG. 3, reference numeral 11 denotes a prepreg for reinforcing the tip of the shaft. The prepreg 11 may be made of, for example, a UD sheet (one-way sheet) in which carbon fibers are aligned in the axial direction, or may be made of a woven fabric, or a combination of a woven fabric and a UD sheet. Is also good. Further, the fiber direction may be a direction other than the axial direction as shown in FIG. By setting the fiber direction to the circumferential direction, the strength in the crushing direction is improved, and by orienting the fiber in an inclined direction with respect to the axial direction, the strength in the twisting direction is improved.

The amount of the prepreg 11 impregnated with the synthetic resin is set to an impregnation ratio larger than that of the main body layer described later. Specifically, the synthetic resin impregnation amount is preferably about 25% by weight or more, and more preferably about 30% by weight or more. As described above, by setting the content to approximately 30% by weight or more, the adhesion between the mandrel 20 and the mandrel 20 is reduced, and the mandrel is easily removed. Further, generation of air bubbles can be prevented, impact resistance is improved, and peeling due to cracks and interlayer displacement can be prevented.

Although the thickness of the prepreg 11 is arbitrary, it is preferable to make the prepreg thinner than the prepreg of the main body layer, for example, to allow a step at the end of winding and to prevent meandering of fibers of the main body layer. In addition, when a prepreg for reinforcement is wound around a part of the length direction other than such a front end portion, it can be configured as described above.

It is preferable that the reinforcing fibers constituting the prepreg 11 be made of a material having a lower elastic modulus than the reinforcing fibers constituting the SP prepregs 15 and 16 of the main body layer. By using fibers having a lower elastic modulus than the reinforcing fibers constituting the SP prepregs 15, 16, the bending strength can be improved, and further, the shear strength and impact resistance can be improved. In addition, the specific gravity is usually selected to be lighter than the specific gravity of the reinforcing fibers of the prepreg for reinforcement used on the main body layer or the grip portion side, but in order to adjust the weight balance of the entire shaft, A prepreg that is heavier than the specific gravity of the reinforcing fibers may be used.

In FIG. 3, reference numeral 12 denotes an innermost prepreg provided on the inner layer side of the AP prepreg, which can be constituted by, for example, a UD sheet in which carbon fibers are aligned in the circumferential direction. In the innermost prepreg, the adhesion between the innermost prepreg and the mandrel 20 is reduced,
In order to prevent the generation of air bubbles on the surface, the amount of the synthetic resin impregnated is preferably about 30% by weight to 50% by weight, which is larger than that of the main body layer.

The thickness of the innermost layer prepreg 12 is arbitrary, but is preferably set smaller than the main body layer in order to avoid a reduction in specific strength and specific rigidity as a whole. As the reinforcing fibers of the prepreg, those having an elastic modulus lower than that of the AP prepreg of the main body layer are used. In particular, in order to improve the crushing strength (strength against crushing), the AP of the main body layer is preferably used. A prepreg having an elastic modulus equal to or larger than that of the prepreg may be used.

The innermost prepreg 12 is provided as a reinforcing layer, and its fiber direction is not limited. Also, without using a prepreg, for example, a narrow tape-shaped prepreg containing an inorganic fiber or an organic fiber such as carbon fiber is spirally wound to form an innermost prepreg 12.
May be configured.

In FIG. 3, reference numeral 13 denotes an AP prepreg constituting the main body layer. This AP prepreg 1
3 is preferably such that the fiber direction is ± 4 with respect to the axial direction so that the shaft may be twisted in either direction.
It is constituted by prepregs 13a and 13b inclined in two directions of 5 °. In addition, it is preferable to overlap the prepregs in advance by about a half turn as shown in FIG. 4 so that these prepregs are alternately wound. In addition, the fiber direction of each prepreg 13a, 13b is not limited to ± 45 ° with respect to the axial direction, but may be in the range of approximately 30 ° to 55 ° (−30 ° to −55 °) with respect to the axial direction. Alternatively, a prepreg having reinforcing fibers in the fiber direction exceeding this range may be used. This AP prepreg 13
Is configured such that the amount of impregnation of the synthetic resin is as low as approximately 20% by weight to 35% by weight, but may exceed this range.

The thickness of the AP prepreg 13 is arbitrary, but is preferably smaller than the SP prepreg constituting the main body layer since the reinforcing fibers are oriented so as to cross each other. Also,
It is preferable that the number of turns of the AP prepreg 13 is larger than that of the SP prepreg. Note that, depending on conditions, the thickness of the AP prepreg 13 is made thicker than the SP prepreg, and A
The number of turns of the P prepreg 13 may be smaller than that of the SP prepreg. However, when AP prepregs having different fiber directions are stacked, the thickness thereof is preferably substantially the same as or less than twice the thickness of the main body layer formed by the SP prepreg in order to prevent uneven thickness. .

In order to improve the torsional rigidity (efficiently) of the AP prepreg 13, it is preferable that the reinforcing fibers have higher elasticity than the reinforcing fibers of the SP prepreg of the main body layer.

In FIG. 3, reference numeral 14 denotes an intermediate layer (buffer layer) interposed between the main body layers of the AP prepreg 13 and the SP prepregs 15 and 16. This intermediate layer 14
Is a UD sheet in which carbon fibers are aligned in the circumferential direction, impregnated with a synthetic resin, and is wound by a predetermined number of plies. In addition, when increasing the impregnation amount of a synthetic resin, it is preferable to use a woven fabric. Further, the fibers as the reinforcing material are not limited to long fibers, and short fibers, whiskers, and particles may be used. Further, such an intermediate layer may be composed of only a synthetic resin.

When the intermediate layer is made of a prepreg, the amount of the synthetic resin impregnated is determined by the amount of the adjacent main body layer (AP prepreg 1).
3, set to be greater than the impregnation amount of the synthetic resin of the SP prepregs 15 and 16). Specifically, when the synthetic resin impregnation amount of the main layer is 20% by weight to 35% by weight, a material impregnated with the synthetic resin so as to be 30% by weight to 50% by weight is used as the intermediate layer. In this case, the thickness of the UD sheet is preferably set to 0.06 mm or less, more preferably 0.04 mm or less. Further, the number of turns of the UD sheet is set to be sufficiently smaller than the thickness of the adjacent main body layer.

Further, the intermediate layer 14 preferably has a greater contact with the synthetic resin than with the reinforcing fibers of the adjacent main body layer (all may be in contact with the synthetic resin). ). Preferably, 80% or more comes into contact with the synthetic resin.

When the fiber is used as the reinforcing material of the intermediate layer 14, its elastic modulus (or the elastic modulus of the prepreg) is 24.
It is preferable to use a material having an elongation at break of 40 ton / mm ² or a material having a high elongation at break.

In FIG. 3, reference numerals 15 and 16 denote SP prepregs constituting the main body layer. The SP prepreg is formed of, for example, a unidirectionally aligned prepreg in which carbon fibers are aligned in the axial direction. In this embodiment, the SP prepreg is divided into a plurality of pieces in order to prevent twisting and wrinkling during winding.

The SP prepreg has a thickness of 0.1 mm.
Although those having a range of from 05 mm to 0.25 mm are used, the present invention is not particularly limited thereto. ±
It may be inclined with respect to the axial direction within a range of 5 ° or ± 15 °. Further, it is preferable to use a high-density, high-elasticity fiber as the reinforcing fiber. For example, when the main body layer is divided into a plurality of layers as in this embodiment, it is preferable that the outer layer has higher strength than the inner layer, and the inner layer is made of a highly elastic fiber (prepreg).

In the outer layer of the SP prepreg constituting such a main body layer, an ultrathin (0.06 mm or less) circumferential fiber may be further formed, or a thread may be wound in a spiral or helical shape. . In this case, the synthetic resin impregnation amount is set to be larger than that of the SP prepreg constituting the main body layer. SP
By forming such a layer on the outer layer of the prepreg, effects such as protection of the main body layer and improvement in appearance can be obtained.

In FIG. 3, reference numerals 17 and 18 denote prepregs for reinforcing the distal end portion of the shaft and the grip portion side, respectively. The reinforcing prepreg has the same configuration as the reinforcing prepreg 11 described above.

By using a metal fiber reinforced prepreg for at least one of the prepregs 11 to 18, the effect of the present invention is exhibited. Since the metal fibers of the metal fiber reinforced prepreg in the present invention are much thinner than conventional ones, the amount of the metal fibers to be added and the fiber direction of the metal fibers can be easily controlled. For this reason, the metal fibers can be easily arranged in a direction other than the axial direction, for example, a direction inclined with respect to the circumferential direction or the axial direction. In addition, prepregs having different shapes (polygonal, non-circular) can be easily formed. Even in such a case, the reinforcing fibers of the prepreg of the main body layer can be prevented from being damaged, and the strength of the tubular body can be prevented from lowering.

More specifically, the distribution amount of the metal fibers in the portion of the tubular body composed of the prepregs 11 to 18 is as follows. (1) Prepreg 11 or prepreg 17 for reinforcement
When used for at least one of the above, the content is set to 7% by weight (3% by volume) or more. In this case, the metal fibers are partially arranged. As a result, stickiness against bending is obtained, the head fixing portion can be reinforced, and moreover, the impact from the outside can be increased, and the internal main body fibers can be protected.

When used for the prepreg 18 for reinforcement, the content is not less than 7% by weight (3% by volume). Again, in this case,
Metal fibers are partially arranged. In this case, the metal fibers are partially arranged. As a result, stickiness against bending is obtained, the grip portion can be reinforced, and the impact from the outside can be increased, so that the internal main body fibers can be protected.

When used for the innermost prepreg 12, the content is 7% by weight (3% by volume) or more. Again, in this case,
Metal fibers are partially arranged. This allows
Stickiness against crushing including crushing deformation due to bending deformation is obtained, and strength is improved. In this case, the innermost prepreg 12 does not necessarily need to have the entire length.

When used for the intermediate layer prepreg 14, the content is 7% by weight (3% by volume) or more. Again, in this case,
Metal fibers are partially arranged. This allows
Stickiness against crushing including crushing deformation due to bending deformation is obtained, strength is improved, and transmission of torsional impact to the AP prepreg can be mitigated. in this case,
The intermediate layer prepreg 14 does not necessarily need to have the entire length. (2) When used for at least one of the main body layer SP prepregs 15 and 16, the content is 15% by weight (5% by volume) or more. In this case, one or more layers in which the axial fiber extends over substantially the entire length of the tubular body are wound. Thereby, in the bending of the entire shaft during the swing, stickiness is obtained,
A sharp feel and a heavy feeling can be obtained. In addition, it is resistant to external impacts, and can protect the internal body fibers. In particular, when used for the main body layer SP prepreg 16, in addition to the above effects, a high-grade appearance can be obtained. (3) When used for at least one of the main body layer SP prepregs 15 and 16, 30 to 85% by weight (10 to 60% by weight).
% By volume). In this case, a plurality of layers in which the axial fibers cover almost the entire length of the tubular body are wound. Thereby, the effect in (2) can be further clarified.

Further, in addition to at least one of the main body layer prepregs 15 and 16, when used for the main body layer AP prepreg 13 or used for the main body layer AP prepreg 13, 30 to 85% by weight (10 to 60% by weight). % By volume). In this case, one or more layers in which the fibers in the axial direction cover almost the entire length of the tubular body are wound as an AP prepreg. Thereby, in addition to the effect of (2), the torsion of the entire shaft during the swing is obtained, and the vibration is attenuated, a sharp feel is obtained, and a heavy feeling is obtained.

The reason why the upper limit of the volume ratio is set to 60% is that when metal fibers are added more, the characteristics of the fiber reinforced prepreg are reduced. In this manner, the prepregs 11 to 18 can be arbitrarily combined and wound, and the weight ratio and the volume ratio of the metal fibers can be arbitrarily set. Thereby, a tubular body exhibiting various characteristics as described above can be obtained as needed.

In the above embodiment, the case where the tubular body for sports equipment is a golf club shaft is described. However, the case where the tubular body for sports equipment is a fishing rod, tennis racket, badminton racket, ski pole, bicycle frame, or the like. Even so, the effect of the present invention is exhibited. That is, adjustment of the vibration characteristics is easy, reinforcement, protection of the reinforcing fibers in the inner layer, weight adjustment, and the like are simultaneously achieved. In addition, when the metal fiber reinforced prepreg is used for a reel, a cooler box, or the like, the above-described effects of the present invention are sufficiently exhibited.

[0054]

As described above, the tubular body for sports equipment of the present invention comprises a fiber reinforced prepreg obtained by impregnating a reinforcing fiber with a synthetic resin, and a fiber reinforced prepreg having an average fiber diameter of about 2%.
Since it is wound using a metal fiber reinforced prepreg obtained by impregnating a metal fiber having an average fiber diameter of twice or less with a synthetic resin, the reinforcing fiber is not damaged by the metal fiber, and a reduction in strength is prevented. be able to. Further, since a relatively large amount of metal fiber can be used, the physical properties of the metal can be sufficiently exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a metal fiber reinforced prepreg used for a tubular body for sports equipment of the present invention.

FIG. 2 is a plan view showing a golf club shaft which is a tubular body for sports equipment of the present invention.

FIG. 3 is a sectional view showing a golf club shaft which is a tubular body for sports equipment of the present invention.

FIG. 4 is a view showing a configuration of a prepreg wound around a mandrel when the golf club shaft shown in FIG. 3 is manufactured.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... metal fiber, 2 ... synthetic resin, 3 ... tip part, 4 ... small diameter part,
5: tapered portion, 6: large diameter portion, 10: golf club shaft, 11 to 18: prepreg, 20: mandrel.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B29D 23/00 C08J 5/24 B32B 1/08 A01K 87/00 630A C08J 5/24 B29C 67/14 X // B29K 105: 08 305: 12 307: 04 B29L 23:00

Claims (1)

[Claims] 1. A fiber reinforced prepreg obtained by impregnating a synthetic resin into a reinforcing fiber, and a fiber reinforced prepreg having an average fiber diameter of about 2
A tubular body for sports equipment, which is wound using a metal fiber reinforced prepreg obtained by impregnating a synthetic resin into a metal fiber having an average fiber diameter of twice or less.