JP2006320529A - Bat and cap for ball game - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bat and a cap for a ball game which is of a good design and is made of a fiber-reinforced structure. <P>SOLUTION: In the golf club head, a second shell member 18 having a curved surface is formed of a fiber-reinforced structure molded of a fabric impregnated with a resin or a light metal. The fabric is a low stitching fabric having a plurality of weft layers formed of a plurality of weft threads Y and a plurality of warp threads X into which weft threads Y of the weft layers are woven, in which some of the warp threads X incorporate weft threads Y of the other weft layers in place of some of weft threads Y forming the weft layers. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ball game tool and a cap body using a fiber reinforced structure.

As a ball hitting tool using a fiber reinforced structure, for example, there is a golf club head described in Patent Document 1 described later.
In this golf club head, the face plate portion is made of a metal matrix reinforced composite material.

Specifically, this golf club head is made of a molded body in which the face plate portion is formed in a shape matching the shape of the face plate by at least one of ceramic particles or ceramic short fibers, and at least one woven fabric. It is what is done.
The face plate part is preheated and fixed on one side of the molded body, and set in a mold while maintaining this state, and filled with a molten metal by a die casting method. A light metal melt is infiltrated into the pores of the cloth to form a metal matrix reinforced composite material.
The texture of the woven fabric appears as a pattern on the surface of the face plate portion thus formed.

JP-A-8-215354 (paragraphs [0008] to [0010] and FIGS. 1 to 8)

Here, the woven fabric includes plain weaves in which warps and wefts are alternately woven, twills in which warps and wefts form an oblique pattern, double twills, satin weaves, plain plain weaves, leno weaves, etc. Things are used.
However, in every woven fabric, the pattern of the weave is a monotonous pattern in which minute weaves are repeated, and it is difficult to give the pattern appearing on the face plate portion high design.
In addition, the woven fabrics of either weaving method are not sufficiently drapeable, and it is necessary to make cuts at several places so as to prevent sagging or overlapping when a curved surface is to be formed.
For this reason, it has been difficult to give the face plate high design properties.
And such a subject arises also in the cap body which consists of a fiber reinforced structure which has not only a ball game hitting tool but a curved surface.

  This invention is made | formed in view of such a situation, Comprising: It aims at providing the hitting tool and cap body with high design property.

In order to solve the above problems, the present invention provides the following means.
The present invention is a ball game hitting tool in which a curved surface portion is configured by a fiber reinforced structure formed by impregnating a fabric with resin or light metal, and the fabric is composed of a plurality of layers of wefts each composed of a plurality of wefts And a plurality of warps that weave each of the wefts of the weft layer, and a part of the warp weaves a weft of another weft layer instead of a part of the wefts constituting the weft layer. A ball hitting tool that is a low-binding woven fabric is provided.

In the ball striking tool constructed in this way, the fabric constituting the fiber reinforced structure is composed of a low-bonding fabric, and therefore the texture of the low-bonding fabric is patterned on the surface of the fiber reinforced structure. Appears as
The low-knotting fabric is a fiber-reinforced structure because wefts are woven with warp yarns for each weft layer, and some warp yarns are woven with weft yarns of other weft layers instead of some weft yarns. The texture is more complex than plain weaving and satin weaving that have been used as body fabrics.
For this reason, since the complicated pattern is formed in the surface of a fiber reinforced structure, the hitting tool for ball games concerning the present invention has high design nature.
In addition, the weave pattern of the low-knotting fabric can be changed in various ways by changing the weaving pattern of the warp, and the size of the weave can be set to any size by changing the thickness of the yarn. be able to.
Thus, since the ball game hitting tool according to the present invention has a wide variety of patterns, the choice of the user in terms of design can be greatly expanded as compared with the prior art.

In addition, as described above, in the low-knotted woven fabric, a part of the warp yarns that weave each weft layer skips some of the weft yarns and weaves the weft yarns of the other weft layers, Each weft layer is loosely bonded to each other. For this reason, the low-binding woven fabric has a high degree of freedom in displacement of each weft and each warp while maintaining sufficient strength as a whole, and is very flexible (that is, the drape property is very high).
Since this low-bonding woven fabric has a very high drape as described above, it has a desired curved surface shape (for example, a substantially spherical shape) without any incision or with minimal incision. Can be made.
For this reason, in the ball game hitting tool according to the present invention, the fiber-reinforced structure is not cut into the fabric, or the cut is minimized, so that the design is high.
Furthermore, in the state in which the low-bound fabric has a desired curved surface shape, each weft and each warp of the low-bound fabric has a smooth curve along the curved surface. Then, many smooth curves along the curved surface appear on the surface of the fiber reinforced structure, and the design is high.

Moreover, in the ball game hitting tool according to the present invention, it is not necessary to make a cut in the fabric constituting the fiber reinforced structure as described above, or it is only necessary to make a minimum cut. It is superior to ball hitting tools.
That is, in this ball game hitting tool, the strength of the fiber reinforced structure can be sufficiently ensured even if the number of times the woven fabric is laminated is smaller than the conventional number. For this reason, in this ball game striking tool, the mass ratio between the light weight part and the weight part can be increased, and adjustment of the weight distribution for optimizing the moment of inertia of the ball game striking tool for hitting is facilitated. High design freedom.
Further, since the low-knotted woven fabric is a thick woven fabric having a plurality of weft layers, a desired thickness can be obtained with a smaller number of layers than a conventional woven fabric, and the labor for manufacturing is greatly reduced. Thus, the ball game hitting tool according to the present invention can be manufactured at low cost.

Further, in this ball game striking tool, at least one of the weft and the warp may be different from at least one of color and texture with respect to some of the other yarns. .
In this case, since the yarns having different colors and textures appear on the surface of the fiber reinforced structure in a complicated pattern, the design is much higher.

Moreover, this ball game hitting tool may have a hollow rod-shaped shaft portion, and at least a part of the shaft portion may be constituted by the fiber reinforced structure.
In this ball game hitting tool, the shaft portion has high designability.
Here, examples of the ball game hitting tool having the shaft portion include a golf club, a park golf club, and a badminton club.

Moreover, this ball game hitting tool may have a hollow golf club head, and at least a part of the golf club head may be constituted by the fiber reinforced structure.
In this ball game hitting tool, the golf club head has a high design.

The present invention also provides a cap body having a curved surface portion formed of a fiber reinforced structure formed by impregnating a fabric with resin or light metal, wherein the fabric is composed of a plurality of wefts each composed of a plurality of wefts. A plurality of warps that weave each of the wefts of each of the weft layers,
Provided is a cap body in which a part of the warp is a low-binding woven fabric in which wefts of other weft layers are woven in place of a part of the wefts constituting the weft layer.

In the cap body configured as described above, since the fabric constituting the fiber reinforced structure is composed of the low-bonding fabric, the texture of the low-bonding fabric appears as a pattern on the surface of the fiber reinforced structure. .
The low-knotting fabric is a fiber-reinforced structure because wefts are woven with warp yarns for each weft layer, and some warp yarns are woven with weft yarns of other weft layers instead of some weft yarns. The texture is more complex than plain weaving and satin weaving that have been used as body fabrics.
For this reason, since the complicated pattern is formed in the surface of a fiber reinforced structure, the cap body concerning this invention has high design property.
In addition, the weave pattern of the low-knotting fabric can be changed in various ways by changing the weaving pattern of the warp, and the size of the weave can be set to any size by changing the thickness of the yarn. be able to.
As described above, since the cap according to the present invention has a wide variety of patterns, the user's choices in design can be greatly expanded as compared with the conventional case.

In addition, as described above, in the low-knotted woven fabric, a part of the warp yarns that weave each weft layer skips some of the weft yarns and weaves the weft yarns of the other weft layers, Each weft layer is loosely bonded to each other. For this reason, the low-binding woven fabric has a high degree of freedom in displacement of each weft and each warp while maintaining sufficient strength as a whole, and is very flexible (that is, the drape property is very high).
Since this low-bonding woven fabric has a very high drape as described above, it has a desired curved surface shape (for example, a substantially spherical shape) without any incision or with minimal incision. Can be made.
For this reason, in the cap body concerning this invention, since the fiber reinforced structure does not have the cut of a textile fabric, or a cut is suppressed to the minimum, the design property is high.
Furthermore, in the state where the low-binding fabric has a desired curved surface shape, each weft and each warp of the low-binding fabric draw a smooth curve along the curved surface, so in the cap body according to the present invention, Many smooth curves along the curved surface appear on the surface of the fiber reinforced structure, and the design is high.

  Further, in the cap body according to the present invention, it is not necessary to make a cut in the woven fabric constituting the fiber reinforced structure as described above, or only a minimum cut is required, so that the conventional cap is also used in terms of strength performance. It is better than the body.

  In addition, since the low-knotted woven fabric is a thick woven fabric having a plurality of weft layers, a desired thickness can be obtained with a smaller number of layers than a conventional woven fabric, and the labor required for manufacturing is greatly reduced. The manufacturing cost of the cap body according to the present invention is low.

In this cap body, at least one of the weft and the warp constituting the woven fabric uses a thread that is different in color and texture from some of the other threads. It may be done.
In the cap body configured in this way, threads with different colors and textures appear in a complicated pattern on the surface of the fiber reinforced structure, and thus the design is much higher.

According to the ball game hitting tool and the cap body according to the present invention, since a complex pattern is formed on the surface of the fiber reinforced structure, the design characteristics compared to the conventional monotonous ball game hitting tool and hat body. Is very expensive.
In addition, the ball game hitting tool and the cap body according to the present invention have a wide variety of patterns, so that the options of the user in terms of design can be greatly expanded as compared with the prior art.
Furthermore, since the woven fabric constituting the curved surface portion of the fiber reinforced structure has no cut or a minimum cut, the design is high.

Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, as shown in FIG. 1, an example in which the present invention is applied to a golf club 1 is shown.
The golf club 1 has a hollow tubular shaft portion 2, a grip 3 provided at one end of the shaft portion 2, and a golf club head 4 provided at the other end of the shaft portion 2.

In the present embodiment, the golf club head 4 is a head having a hollow portion inside a driver or a fairway wood.
As shown in FIG. 2, the golf club head 4 includes a face portion 11 constituting a hitting ball portion, a crown portion 12 constituting an upper surface, a side portion 13 constituting a peripheral surface behind the face portion 11, It has a configuration including a sole portion 14 constituting the lower surface and a hosel portion 16 provided on the right side of the upper end of the face portion 11 and connected to the other end of the shaft portion 2. Note that the golf club 1 shown in the present embodiment is for right-handed use, and in the case of left-handed use, the hosel part 16 is provided on the upper left side of the face part 11.

As shown in FIGS. 3A and 4, the golf club head 4 includes a first outer shell member 17 including a face portion 11 and a hosel portion 16, and a second portion constituting the remaining portion of the golf club head 4. The outer shell member 18 is joined.
In the present embodiment, the opening end of the second outer shell member 18 is joined in a state where its outer peripheral surface is disposed so as to be in close contact with the inner peripheral surface of the opening end 17a of the first outer shell member 17. . In addition, when it is necessary to make the first outer shell member 17 and the second outer shell member 18 more firmly joined, as shown in FIG. If a separate reinforcing material 19 is laminated on the outer peripheral surface side of the joining boundary of the two outer shell members 18 so as to straddle these members, stronger joining can be realized.

In the present embodiment, the first outer shell member 17 is made of metal, and includes a face portion 11, a flange portion 21 that extends rearward from the periphery of the face portion 11, an upper end of the face portion 11, and a flange portion 21. The hosel part 16 provided continuously with the upper end and the sole part 14 extending rearward continuously from the lower end of the collar part 21 are included.
The first outer shell member 17 can be manufactured by casting, forging, hot pressing, machining, or the like. Preferably, the first outer shell member 17 is formed of titanium or stainless steel by casting or forging. The first outer shell member 17 is not limited to the above range, and can be a metal matrix composite or a ceramic material without departing from the scope of the present invention.

The second outer shell member 18 is a substantially cup-shaped fiber reinforced structure made of carbon fiber reinforced resin or the like, has a gently curved surface that protrudes upward, and a peripheral edge that protrudes outward. The crown portion 12 that draws an arc and the side portion 13 that forms a convex curved surface along the periphery of the crown portion 12 are included.
The second outer shell member 18 is configured by laminating a plurality of low-binding woven fabric prepregs P (see FIG. 7A) obtained by impregnating the low-binding fabric S shown in the overhead view of FIG. 5 with a synthetic resin. Yes.

Low stitching fabric S is constituted by warps _{X a, X b, X c} , ... and wefts _{Y 1, Y 2, Y 3} , ... and. In this low-binding woven fabric S, the weft Y has a three-layer structure in which three layers and 18 rows are one complete. This low-binding woven fabric S can be composed of carbon fiber, glass fiber, aramid fiber, or a mixed weave thereof. In this embodiment, the low-binding woven fabric S is composed of carbon fibers.
FIGS. 6 (a) to 6 (h), (j), and (k) show how the warps X are connected to the wefts Y. FIG. Illustrates how the stitching of the weft Y in the figures 6 (a) ~ (h) , (j), (k) , the warps _X a _{to X} h in this order, _{respectively,} X j, _{X k} It is. Incidentally, how the stitching of the weft Y in the warp X _i is the same as for the warps X _c shown in FIG. 6 (c), how the stitching of the weft Y in the warp X _l is 6 ( This is the same as the case of the warp _Xf shown in f).

As shown in FIGS. 6A to 6H, (j), and (k), the low binding fabric S includes a plurality of weft layers L each having a plurality of wefts Y. In this embodiment, as the weft layer L, the weft layer L ₁ composed of wefts Y ₁ , Y ₄ , Y ₇ ,..., The weft layer L ₂ composed of wefts Y ₂ , Y ₅ , Y ₈ ,. _{3, Y} 6, _{Y 9,} is provided with three layers of weft layer _{L 3} made of ....
Each of the warp yarns X _a , X _b , X _c ,... Weaves the weft Y of one weft layer L. Further, adjacent wefts X interweave different weft layers L. In the present embodiment, warps X _a is factored weft layer L _1, warps X _b is factored weft layer L _2, warps X _c is factored weft layer L _3, after the warp X similar The weft layer L is woven in the pattern.

Further, a part of the warp X is woven with the weft Y of another weft layer L in place of a part of the weft Y constituting the weft layer L.
In the present embodiment, warps _{X b} are woven with weft _{Y 12} constituting the weft layer _{L 3} in place of the weft _{Y 11} constituting the weft layer _{L 2,} warps _{X e} constitutes the weft layer _{L 2} The weft Y ₉ constituting the weft layer L ₃ is woven in place of the weft Y ₈ , and the warp Y _g is composed of the weft Y ₅ constituting the weft layer L ₂ instead of the weft Y ₄ constituting the weft layer L _1. Weaving.
Also, warps _{X j,} as well as weaving weft _{Y 8} constituting the weft layer _{L 2} in place of the yarn _{Y 7} constituting the weft layer _{L 1,} the weft layer instead of the weft _{Y 13} constituting the weft layer _{L 1} L _The weft Y ₁₄ constituting ₂ is interwoven.
The low-bonding woven fabric S having such a configuration can be woven by, for example, partially improving a general-purpose rapier loom so as to be able to cope with weaving of reinforcing fibers.

As shown in FIG. 7A, the low-bonding woven fabric prepreg P has a substantially semicircular shape in a state of being flattened, and a linear portion of the periphery of the prepreg P is a cup. An opening end (that is, a connection portion with the peripheral edge portion of the face portion 11) when deformed into a shape is formed.
The arrangement direction of the reinforcing fibers (weft Y, warp X) constituting the low-bonding woven fabric prepreg P is considered with respect to the face portion 11, and with respect to the connection end with the face portion 11 in a state of being flattened. Are arranged in each of a parallel direction and a perpendicular direction and those arranged so as to be oblique to the face portion 11 are alternately laminated.

  Further, the amount of the resin in the low-binding woven fabric prepreg P is 30% to 40% with respect to the weight of the total prepreg, and in a preferred embodiment, it is 31% to 35%. If the amount of resin is less than 31%, resin-deficient portions and voids are likely to occur during molding, making it difficult to obtain a clean surface. In addition, the strength also decreases. On the other hand, if the amount of resin is larger than 35%, the resin-rich portion, that is, the portion where no reinforcing fiber is present increases, and the strength becomes weak. As this resin, an epoxy resin, a polyester resin, a polyimide resin, or the like can be used. As a preferred embodiment, an epoxy resin is used.

  In forming the second outer shell member 18 with the low-bonding woven fabric prepreg P, as shown in FIG. 7B, the outer surface of the core member 26 having a desired shape for forming the second outer shell member 18 is formed. Among them, a plurality of low-bonding woven fabric prepregs P cut out in the shape shown in FIG. 7A are laminated at portions corresponding to the crown portion 12 and the side portion 13, and a pressure heating apparatus such as an autoclave is used. By curing the resin, a desired hollow shape shown in the cross-sectional view of FIG. In the present embodiment, the low-bonding woven fabric prepreg P is laminated in four layers so that the orientation directions of the reinforcing fibers of the respective layers are not the same in adjacent layers.

As described above, in the golf club 1 according to this embodiment, a small amount of the first outer shell member 17 is formed of a metal material, and the remaining portion is a material having a specific gravity smaller than that of the first outer shell member 7. The second outer shell member 18 is formed by firmly joining both members.
In order to make a golf club strong and durable, it is necessary to have a structure that effectively attenuates the impact caused by the hitting of the ball. Since the outer shell member 18 is made of fiber reinforced resin, the impact at the time of hitting the ball can be attenuated better than in the case where the second outer shell member 18 is made of metal, and the strength and durability are excellent. ing.

In the golf club 1 configured as described above, the fabric constituting the second outer shell member 18 that is a fiber-reinforced structure is constituted by the low-binding fabric S. Shows the texture of the low binding fabric S as a pattern.
As described above, the low-binding woven fabric S is woven with the weft Y with the warp Y for each of the weft layers L. In some warps X, instead of some wefts Y, other weft layers L Since the weft Y is woven, the weave is more complex than a plain weave or satin weave conventionally used as a fabric for a fiber reinforced structure.
For this reason, in this golf club 1, since a complicated pattern is formed in the surface of the crown part 12 and the side part 13, the design property is high.

The weave pattern of the low-knotting fabric S can be changed variously by changing the weaving pattern of the warp X, and the size of the weave can be changed to any size by changing the thickness of the yarn. Can be set.
As described above, the golf club 1 according to the present embodiment has a wide variety of patterns, so that the user's choices in design can be greatly expanded as compared with the related art.

In addition, as described above, in the low-knotting fabric S, a part of the warp yarn X that weaves each weft layer L skips some wefts Y and weaves the weft Y of another weft layer L, and each weft yarn The wefts Y of the layer L and the weft layers L are loosely coupled to each other. For this reason, the low-binding woven fabric S has a high degree of freedom in displacement of each weft Y and each warp X while maintaining sufficient strength as a whole, and is very flexible (that is, the drape property is very high). .
Since the low-bonding woven fabric S has a very high draping property as described above, in the present embodiment, the low-binding woven fabric S can faithfully follow the surface of the core material 26 without making a cut.
For this reason, in the golf club 1 concerning this embodiment, since the crown part 12 and the side part 13 do not have the cut | notch of a woven fabric, and a woven fabric pattern does not cut | interrupt in the middle or is disturbed, design nature is high.
Furthermore, in the state where this low-binding fabric S is formed into a desired curved surface, each weft Y and each warp X of the low-binding fabric S draws a smooth curve along the curved surface, so that the golf according to the present embodiment In the club 1, as shown in FIG.7 (b), many smooth curves along the curved surface appear on the surface of the crown part 12 and the side part 13, and the design property is high.

In addition, the golf club 1 is superior to the conventional golf club in terms of strength performance because it is not necessary to make a cut in the fabric constituting the second outer shell member 18 as described above.
That is, in the golf club 1, the strength of the second outer shell member 18 can be sufficiently ensured even if the number of times the woven fabric is laminated is smaller than before. For this reason, in this golf club 1, the mass ratio between the light weight part and the weight part can be increased, and the weight distribution for optimizing the moment of inertia of the golf club 1 for hitting can be easily adjusted. High degree of freedom.
Further, since the low-knotting fabric S is a thick woven fabric having a plurality of weft layers L, a desired thickness can be obtained with a smaller number of layers than a conventional fabric, and labor for manufacturing is greatly reduced. . Thereby, the manufacturing cost of the golf club 1 according to the present embodiment is low.

Here, in this embodiment, the example which comprised the low binding fabric S used for the golf club 1 only by carbon fiber was shown. In this example, the entire surface of the second outer shell member 18 is a carbon fiber color (black), and the surface texture is uniform.
On the other hand, in at least one of the weft Y and the warp X, at least one of the color and the texture may be different from the other yarns for some of the yarns.
In this case, since the yarns having different colors and textures appear on the surface of the second outer shell member 18 in a complicated pattern, the design is further enhanced.
For example, when a part of the warp yarn X is an aramid fiber, the color (yellow) of the aramid fiber appears in a complicated pattern on the surface of the black background of the second outer shell member 18, and a vivid pattern is obtained.

In the present embodiment, as the golf club 1, the example in which the second outer shell member 18 of the golf club head 4 is configured by the crown portion 12 and the side portion 13 has been described. As in the golf club 1 a shown in FIGS. 8 and 9, the sole portion 14 may be provided not on the first outer shell member 17 but on the second outer shell member 18.
In this case, the sole portion 14 is also manufactured as a cup-shaped fiber reinforced structure integrated with the crown portion 12 and the side portion 13.
As shown in FIG. 10A, the second outer shell member 18 having such a configuration is in the vicinity of the top of the arc in the substantially semicircular low-bonding woven fabric prepreg P in a state of being flattened. It is formed by a low-binding woven fabric prepreg P ₁ provided with an overhang portion 27 constituting the sole portion 14 and provided with cuts C on both sides of the overhang portion 27.
Specifically, as shown in FIG. 10 (b), the low-knotting fabric prepreg P _1, on the surface of the desired shape of the core material 28, by laminating a plurality changing the arrangement direction of the reinforcing fibers The desired hollow second outer shell member 18 shown in FIG. 10C is formed.

In this case, since the drape of the low stitching fabric prepreg P ₁ is very high, thus even the complicated shape of the second outer shell member 18 need only provide a cut C two places.
For this reason, also in the golf club 1a which integrally molded the sole part 14 with the crown part 12 and the side part 13 in this way, the design property is high and the intensity | strength is also excellent.

Here, with respect to the golf club heads 4 of the golf clubs 1 and 1a according to the present embodiment, the degree of freedom in design and durability were evaluated, and the results are shown in Table 1.
In the following description, the golf club 1 is referred to as Example 1, the golf club 1a is referred to as Example 2, and a portion corresponding to the second outer shell member 18 in Example 1 is a unidirectionally aligned (UD) prepreg. What was formed by laminating 10 layers was set as Comparative Example 1, and in Example 2, the portion corresponding to the second outer shell member 18 was formed by laminating 10 layers of unidirectionally aligned (UD) prepregs. It was set as Comparative Example 2.

Regarding the degree of freedom of design, for Example 1 and Comparative Example 1, and for Example 2 and Comparative Example 2, the mass of the first outer shell member and the second outer shell member, the mass of the adhesive that bonds them, and The thickness of the second outer shell member was compared.
As can be seen from Table 1, in Example 1, the mass of the second outer shell member is reduced by about 20% and the thickness is also reduced by about 20% compared to Comparative Example 1. Moreover, also in Example 2, compared with the comparative example 2, it turns out that the mass of the 2nd outer shell member is reduced about 20%, and thickness is also reduced about 20%.
Thus, in each Example, it turns out that the mass ratio of a lightweight part and a weight part is large with respect to a comparative example. Thereby, in each Example, since the adjustment of the weight distribution for optimizing the moment of inertia of the golf club for hitting is facilitated compared to the comparative example, the degree of freedom in design is high.

The evaluation of durability was measured when the golf club head was fixed for each of Examples 1 and 2 and Comparative Examples 1 and 2, and the second outer shell member of the golf club head was broken by applying a compressive load from the crown portion. It was performed based on the applied load value.
As can be seen from Table 1, in each example, it is understood that the durability is improved by about 35 to 40% with respect to the comparative example.

[Second Embodiment]
Next, a second embodiment of the present invention will be described using FIG. 11 and FIG.
In this embodiment, the example which applied this invention to the park golf club is shown.
The park golf club has substantially the same configuration as a normal golf club, but a shaft portion thicker than a normal golf club is used as the shaft portion.
FIG. 11 shows a shaft portion 31 of the park golf club according to the present embodiment. In FIG. 11, the dimension in the longitudinal direction of the shaft portion 31 is shown in a reduced form, but in the actual shaft portion 31, the dimension in the longitudinal direction is set sufficiently longer than the dimension in the radial direction.

The shaft portion 31 is configured by a fiber reinforced tubular body 32 that is gradually reduced in diameter from the grip side toward the golf club head side.
In the present embodiment, the fiber reinforced tubular body 32 is formed by stacking fiber reinforced resin prepregs in which reinforcing fibers are oriented substantially parallel to the axial direction (inclination of 0 ° to ± 5 ° with respect to the axial direction). A straight layer 33 and a bias layer 34 in which fiber reinforced resin prepregs oriented in a direction inclined by ± 20 ° to ± 70 ° with respect to the axial direction are laminated.

In addition to the straight layer 33 and the bias layer 34, the fiber reinforced tubular body 32 is provided with a reinforcing layer 35 for partial reinforcement as needed.
The reinforcing layer 35 is, for example, a fiber reinforced resin prepreg in which reinforcing fibers are oriented in a direction substantially parallel to the axial direction of the fiber reinforced tubular body 32 or in a direction inclined with respect to the axial direction, or a fiber reinforced tubular body. The fiber reinforced resin prepreg (hoop layer) is oriented in a direction substantially orthogonal to the 32 axial directions (inclination of ± 80 ° to 90 ° with respect to the axial direction).
In the present embodiment, the first reinforcing layer 35 a is provided on the outer peripheral surface of the narrow-side end of the straight layer 33, and the second reinforcing layer 35 b is provided on the outer peripheral surface of the narrow-side end of the bias layer 34. ing.
The number of laminated fiber reinforced resin prepregs (the number of times that a specific layer such as a straight layer or a bias layer is wound around the fiber reinforced tubular body 32) depends on the strength required for the fiber reinforced tubular body 32. Is set arbitrarily.

Examples of reinforcing fibers used in these fiber reinforced prepregs include carbon fibers, glass fibers, aramid fibers, ceramic fibers, boron fibers, metal fibers, and the like. Preferably, carbon fibers are used.
In the present embodiment, a unidirectionally aligned prepreg using carbon fibers having a tensile elastic modulus of 50 GPa to 800 GPa is used as the fiber reinforced prepreg.
As the matrix resin impregnated in the reinforcing fiber in the fiber reinforced prepreg, a thermosetting resin or a thermoplastic resin selected from an epoxy resin, an unsaturated polyester resin, a phenol resin, a silicone resin, a polyurethane resin, a urea resin, and a melamine resin is selected. It is. An epoxy resin is preferably used.

The fiber reinforced tubular body 32 is configured such that a design layer 36 in which a low-bonding woven fabric prepreg is laminated is provided on the outer periphery of each layer constituted by each of the above fiber reinforced resin prepregs.
It is not particularly limited basis weight of reinforcing fibers used in low bounding fabric prepreg that constitutes the design layer 36, in this embodiment, those of 70g ^/ m ² ~350g / m 2 is used.
When the basis weight of the reinforcing fibers is 350 g / m ² or more, the mass of the shaft portion 31 becomes too large as a general shaft portion. On the other hand, when the basis weight of the reinforcing fiber is 70 g / m ² or less, the gap becomes large and the function of the low-bonding woven fabric prepreg may not be sufficiently exhibited.
Therefore, in the present embodiment, the reinforcing fibers of the low stitching fabric ^prepreg, the reinforcing fibers of 70g / ^{m 2} ~350g / m 2 is used.
Here, in order to ensure further strength, the fiber reinforced tubular body 32 has a reinforcing layer in which a low-bonding woven fabric prepreg is laminated at any position in the radial direction in addition to the design layer 36 described above. It may be provided.

Hereinafter, the manufacturing method of this shaft part 31 is demonstrated based on sectional drawing of FIG. 11, and the exploded view of FIG.
First, as shown in FIG. 12, after applying a release agent to a tapered mandrel 41 having a diameter on the small diameter side of 13 mm, a diameter on the large diameter side of 18 mm, and a length of 900 mm,
Tensile modulus 300 GPa,
100 g / m ²
Resin content 30%
The carbon fiber unidirectionally aligned prepreg is cut to obtain two bias layer prepregs 34a and 34b each of which can be wound around the mandrel 41 twice. The bias layer prepregs 34a and 34b are obtained by mandrel 41. And the bias layer 34 is obtained. Here, the bias layer prepregs 34 a and 34 b are oriented such that the orientation directions of the carbon fibers are + 35 ° and −35 ° with respect to the axial direction of the mandrel 41 when wound around the mandrel 41.

Tensile modulus 300 GPa
100 g / m ²
Resin content 30%
Cutting the unidirectionally aligned prepreg of the carbon fiber to obtain the prepreg constituting the first reinforcing layer 35a constituting the reinforcing layer 35, and
Tensile modulus 50 GPa
100 g / m ²
Resin content 30%
The first reinforcing layer 35b constituting the reinforcing layer 35 is obtained by cutting the unidirectionally aligned prepreg of the glass fiber.

  The prepregs constituting the first reinforcing layers 35a and 35b are cut into a shape capable of making two rounds from the small diameter end on the bias layer prepreg 34 to the position of about 200 mm toward the large diameter side. Two pieces of the prepreg are wound around the bias layer 22 so that the carbon fibers of these prepregs are parallel to the axial direction of the mandrel 41.

Tensile modulus 300 GPa
100 g / m ²
Resin content 30%
The carbon fiber unidirectionally aligned prepreg is cut to obtain a single straight layer prepreg 33a having a shape capable of making two turns around the outside of the bias layer 34 including the first reinforcing layers 35a and 35b. The straight layer prepreg 33 a is wound on the bias layer 34 so that the carbon fiber is parallel to the axial direction of the mandrel 41, thereby obtaining the straight layer 33.

  The unidirectionally aligned prepreg of the same carbon fiber as the prepreg constituting the first reinforcing layer 35a is shaped so that it can make two rounds from the small diameter end on the straight layer prepreg 33a to the position of about 200 mm from the large diameter side. The prepreg is cut and wound on the straight layer 34 so that the carbon fiber is parallel to the axial direction of the mandrel 41 to obtain a second reinforcing layer 35c.

Tensile modulus 240 GPa
Weight per unit area 260g / m ²
Resin content 40%
The low-binding woven fabric prepreg 36a is a single low-bonding woven fabric layer prepreg 36a having a shape that allows the prepreg to go around the outside of the straight layer 33 including the second reinforcing layer 35c. Get. Here, the low-binding fabric used for the low-binding fabric layer prepreg 36a has the same configuration as the low-binding fabric S used for the prepreg P shown in the first embodiment.
The design layer 36 is obtained by winding the low tie layer prepreg 36 a on the straight layer 33 so that the carbon fibers are parallel to the axial direction of the mandrel 41.

  After each prepreg is wound around the mandrel 41 as described above, a wrapping tape is further wound around the obtained laminate, heated to 130 degrees and cured, and then the mandrel 41 is pulled out to obtain the shaft portion 31.

The park golf club having the shaft portion 31 configured as described above is provided with a design layer 36 on the outermost periphery of the shaft portion 31.
As described above, the low binding fabric constituting the design layer 36 has the same configuration as the low binding fabric S used in the golf club 1 shown in the first embodiment.
For this reason, a complicated pattern will be formed in the outer peripheral surface of the shaft part 31, and the design property is high.

  Moreover, since the low-bonding woven fabric layer prepreg constituting the design layer 36 of the shaft portion 31 is rich in elasticity as described above, it is easy to follow the portion with a large curvature of the straight layer 33 as a base, and the surface is easy to follow. It can be formed smoothly and beautifully. Therefore, since the amount of surface polishing for the finishing process can be reduced, the park golf club according to the present embodiment has high productivity and less mass variation.

Here, in the park golf club, the design layer 36 covering the outer peripheral surface of the shaft portion 31 also functions as a reinforcing material for the park golf club.
Hereinafter, in order to verify the reinforcing effect of the park golf club by the design layer 36, a bending property measurement test of the shaft portion 31 was performed.
Below, the said shaft part 31 is made into an Example. For comparison, instead of the design layer 36 that is the outermost layer in the shaft 31, a tensile elastic modulus of 240 GPa that has been generally used conventionally.
Weight per unit area 200g / m ²
Resin content 35%
A shaft portion having the same configuration as the shaft portion 31 (hereinafter referred to as “comparative example”) was prepared except that a plain woven cloth prepreg of carbon fiber was used.

Here, as a bending property measurement test, a three-point bending test of Examples and Comparative Examples was performed.
The test results are shown in Table 2. The “displacement amount (deflection amount)” is a value obtained by measuring the displacement amount (deflection amount) of the load point by applying a load of 29.4 [N · m] to the central portion of the shaft portion. The displacement amount (deflection amount) of the part is assumed to be 100, and the displacement amount (deflection amount) of the shaft portion of the embodiment is expressed as a percentage. Further, the “breaking strength” is a value measured when a load is applied to the central portion of the shaft portion for breaking, and the breaking strength of the shaft portion of the embodiment is set to 100 as the breaking strength of the shaft portion of the comparative example. Expressed in percentage.

As shown in Table 2, in the example, although the size of the large-diameter portion is lower than that of the comparative example, the displacement amount is 5% less than that of the comparative example, and the fracture strength is higher than 15%. .
That is, it can be said that the shaft portion 31 of the park golf club according to the present embodiment is a shaft portion that is stronger and harder to break than the conventional shaft portion.

  Here, in the present embodiment, the example in which the present invention is applied to the shaft portion 31 of the park golf club has been shown. However, the present invention is not limited thereto, and other ball hitting tools, for example, shafts such as golf clubs and badminton clubs. Can be applied to the department.

[Third embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, as shown in the perspective view of FIG. 13, an example in which the present invention is applied to a helmet 51 (cap body) used for ball games such as baseball is shown.
The helmet 51 has a substantially elliptical hemispherical shell shape along the shape of the user's head, and a fiber having a substantially hemispherical shell shape as shown in FIG. It has a cap body 52 (fiber reinforced structure) made of a reinforced resin layer and a buffer member 53 mounted in the cap body 52.
The cap body 52 is formed by molding the prepreg impregnated with the low-bonding fabric S shown in the first embodiment into a predetermined shape, and as shown in FIG. The texture of the fabric S appears as a pattern.
Carbon fibers, glass fibers, aramid fibers, and the like can be used as the fibers used in the low-bonding fabric S. Polypropylene resins, polycarbonate resins, epoxy resins, polyester resins, vinyl ester resins, and the like can be used as matrix resins. Can be used.

The cap body 52 is obtained by molding the prepreg P ₂ using the low-binding fabric S shown in FIG. 16 into the shape of the cap body 52. In the present embodiment, the low knotting fabric S formed by carbon fibers, to obtain a prepreg P ₂ by impregnating the epoxy resin to the low-stitching fabric S.
Specifically, the cap body 52 is formed by applying a prepreg P ₂ to a cap body-forming lower mold 56 having a substantially elliptical hemispheric surface having a predetermined shape, and the fiber arrangement direction with respect to the front-rear direction of the helmet 51. Cover in a direction that tilts ± 45 °.
In this state, as shown in FIG. 17, the cap body 52 having a predetermined shape is formed by heat-curing the resin in a state in which the mold is clamped by the cap body upper mold 57.

In the helmet 51 configured as described above, since the cap body 52 is composed of the low-bonding fabric S, the texture of the low-bonding fabric S appears as a pattern on the surface of the cap body 52. High designability.
Further, as described above, since the weave pattern and the size of the weave can be arbitrarily set, the helmet 51 has a wide variety of patterns, and the user can select the design. Can be greatly expanded as compared with the prior art.

The low stitching fabric S, so drape is very high, without the prepreg P ₂ a cut, it is possible to sag without faithfully along the surface of the core material 26.
For this reason, in the helmet 51 according to the present embodiment, there is no cut of the fabric on the surface of the cap body 52, and the fabric pattern is not cut or disturbed in the middle, so that the design is high.
Furthermore, in the state where this low-binding fabric S is formed into a desired curved surface, each weft Y and each warp X of the low-binding fabric S draws a smooth curve along the curved surface, so the helmet according to this embodiment. In 51, as shown in FIG. 15, many smooth curves along the curved surface appear on the surface of the cap body 52, and the design is high.

Further, this helmet 51 is superior to conventional helmets in terms of strength and performance because it is not necessary to make a cut in the fabric constituting the cap body 52 as described above.
That is, the helmet 51 can sufficiently secure the strength even when the number of times of woven fabrics is reduced as compared with the conventional case, so that the helmet 51 can be reduced in weight without reducing the strength.
Further, since the low-knotting fabric S is a thick woven fabric having a plurality of weft layers L, a desired thickness can be obtained with a smaller number of layers than a conventional fabric, and labor for manufacturing is greatly reduced. . Thereby, the manufacturing cost of the helmet 51 according to the present embodiment is low.
Here, in the present embodiment, an example in which the present invention is applied to a helmet used for ball games such as baseball is shown. However, the present invention is not limited to this, and other sports, safety helmets, motorcycles and road bikes are used. It can be applied to helmets and the like.

It is a figure which shows the golf club (ball game hitting tool) concerning 1st embodiment of this invention. It is a figure which shows the golf club head of the golf club shown in FIG. FIG. 3 is a longitudinal sectional view of the golf club head shown in FIG. 2. FIG. 3 is an exploded perspective view of the golf club head shown in FIG. 2. It is a bird's-eye view which shows the low connection textile used for the golf club concerning a first embodiment of the present invention. It is sectional drawing which shows the structure of the low connection textiles shown in FIG. It is a figure which shows the manufacturing process of the golf club concerning 1st embodiment of this invention. It is sectional drawing which shows the other example of a form of 1st embodiment of this invention. FIG. 9 is an exploded perspective view of the golf club head shown in FIG. 8. It is a figure which shows the manufacturing process of the golf club head shown in FIG. It is sectional drawing which shows the structure of the shaft part of the park golf club (ball game hitting tool) concerning 2nd embodiment of this invention. It is an exploded view of the shaft part shown in FIG. It is a perspective view which shows the helmet (cap body) concerning 3rd embodiment of this invention. It is AA arrow sectional drawing of FIG. It is a figure which shows the pattern formed in the outer surface of the helmet shown in FIG. It is a figure which shows the manufacturing process of the helmet shown in FIG. It is a figure which shows the manufacturing process of the helmet shown in FIG.

Explanation of symbols

1,1a Golf Club (ball game hitting tool)
2,31 Shaft (fiber reinforced structure)
4 Golf club head 18 Second outer shell member (fiber reinforced structure)
51 Helmet
52 Cap body (fiber reinforced structure)
L Weft layer S Low tying fabric X Warp Y Y Weft

Claims (6)

A ball hitting tool in which a curved surface portion is constituted by a fiber reinforced structure formed by impregnating a woven fabric with resin or light metal,
A plurality of weft layers each composed of a plurality of wefts;
A plurality of warps weaving each of the wefts of the weft layer;
A ball hitting tool in which a part of the warp is a low-binding woven fabric in which a weft of another weft layer is woven in place of a part of the weft constituting the weft layer.   The ball hitting tool according to claim 1, wherein at least one of the weft and the warp is different in at least one of color and texture from some of the other yarns. It has a hollow rod-shaped shaft part,
The ball hitting tool according to claim 1 or 2, wherein at least a part of the shaft portion is constituted by the fiber reinforced structure. A hollow golf club head,
The ball hitting tool according to any one of claims 1 to 3, wherein at least a part of the golf club head is constituted by the fiber reinforced structure. A cap body having a curved surface portion formed by a fiber reinforced structure formed by impregnating a woven fabric with resin or light metal,
A plurality of weft layers each composed of a plurality of wefts;
A plurality of warps weaving each of the wefts of the weft layer;
A cap body in which a part of the warp is a low-binding woven fabric in which wefts of other weft layers are woven in place of a part of the wefts constituting the weft layer.   The at least one of the weft and the warp constituting the woven fabric is a yarn in which at least one of color and texture is different from other yarns for some yarns. 5. The cap body according to 5.

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