JP2007203115A - Golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club comprising a shaft to prevent strength from lowering and varying. <P>SOLUTION: A golf club includes a shaft having prepreg sheets wound thereon, each of the prepreg sheets being formed by orienting reinforcing fibers in one direction and then by impregnating the fibers with a synthetic resin. The shaft includes an oblique fiber layer formed by winding the prepreg sheets 7a, 7b, each having the reinforcing fibers oriented in a direction oblique relative to an axis of the shaft, in such a superposed manner that the directions of orientation of the reinforcing fibers of the prepreg sheets cross each other, and a thickness of each of the prepreg sheets 7a, 7b, constituting the oblique fiber layer, is not more than 0.06 mm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a golf club.

  Normally, a shaft used for a golf club is a cellophane tape on which a so-called prepreg sheet, in which reinforcing fibers are aligned in one direction and impregnated with a synthetic resin, is polymerized on a cored bar. After being wound and stabilized, the synthetic resin is heat-cured in a heating furnace, and then cooled and prepared through processes such as decentering, cellophane tape peeling, polishing, and coating.

  And generally, the laminated structure by the said prepreg sheet wound with respect to a metal core has arranged the reinforced fiber in the direction diagonally inclined with respect to the metal core (45 degrees with respect to an axial direction). A prepreg sheet (oblique prepreg sheet) is piled so that the assembling directions cross each other (often piled so as to be ± 45 ° with respect to the axial direction), and the oblique fiber layer wound. It has a main body layer with an axial fiber layer wound with a prepreg sheet (axial prepreg sheet) in which reinforcing fibers are aligned in the axial direction with respect to the core metal, and further, for such a main body layer, The reinforcing layer is formed by laminating a prepreg sheet (circumferential prepreg sheet) in which reinforcing fibers are aligned in the axial direction or in the circumferential direction at a necessary position.

  In the above-described conventional configuration, the thickness of the oblique sheet and the axial sheet used as the main body layer is generally about 0.1 mm to 0.2 mm.

  However, as described above, the oblique sheet is wound around the core metal in a state of being overlapped so that the fiber directions thereof are crossed, and therefore has a wall thickness difference approximately double that of the axial sheet. That is, for example, when a sheet having a thickness of 0.1 mm is used as the oblique sheet and the axial sheet, the two oblique sheets are wound in a stacked state, so that the thickness is 0.2 mm. Therefore, there is a wall thickness difference that is approximately twice that of the axial sheet. Therefore, when the sheet having such a thickness is wound, an uneven thickness state due to the thickness occurs in the overlapping portion of the winding end region.

  In particular, recently, there has been a demand for weight reduction and high elasticity of the shaft, and the number of windings of the oblique sheet and the axial sheet has decreased. For this reason, when the uneven thickness due to the above-described thickness difference occurs in the end region of the sheet to be wound, there arises a problem that the strength is reduced due to the thickness difference or the variation in strength is increased.

  In addition, since the shaft generally has a large diameter on the grip side and a small diameter on the head side, the torsional rigidity is increased on the grip side, and the torsional rigidity is decreased on the head side. Therefore, the number of turns of the oblique sheet is different between the head side and the grip side so that the thickness of the oblique fiber layer is thick on the head side and thin on the grip side.

  However, according to such a configuration, there arises a problem that the strength is likely to be lowered and damaged easily at a substantially intermediate portion of the shaft due to torsion and a load on the head.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a golf club that includes a shaft that prevents strength reduction and strength variation.

  In order to solve the above problems, a golf club of the present invention includes a shaft wound with a prepreg sheet in which reinforcing fibers are aligned in one direction and impregnated with a synthetic resin, and the shaft is in the axial direction of the shaft. The prepreg sheet with the reinforcing fiber assembling direction obliquely provided with an oblique fiber layer formed by overlapping and winding the prepreg sheets so that the assembling direction crosses, and this oblique fiber layer The thickness of the prepreg sheet constituting the film is 0.06 mm or less.

  Usually, the thickness of the prepreg sheet wound around the shaft is about 0.1 mm to 0.2 mm, and the thickness of the prepreg sheet constituting the oblique fiber layer is set to 0.06 mm or less. Therefore, even if this is used in an overlapping manner, it can be about 0.1 mm to 0.2 mm, the thickness difference can be reduced in the overlapping portion of the winding end region, and the strength can be reduced. Variation in strength is suppressed.

  Further, the shaft in the golf club of the present invention is a slant formed by overlapping and winding a prepreg sheet in which the assembling direction of the reinforcing fibers is oblique with respect to the axial direction so that the assembling direction crosses. The oblique fiber layer has different numbers of windings at the distal end portion and the proximal end portion of the shaft, and each pulling direction is within a range of 40% to 60% from the distal end with respect to the entire length of the shaft. It is characterized by being formed by winding two or more layers.

  Normally, the shaft of a golf club tends to break in the range of 40% to 60% from the tip with respect to the total length of the shaft due to torsion and head load. Therefore, by increasing the thickness of the oblique fiber layer at such a position, the strength can be improved and the breakage can be suppressed.

  Further, the shaft in the golf club of the present invention is a slanted fiber layer made of a polymerized prepreg sheet that is formed by superimposing prepreg sheets in which the reinforcing fiber pulling direction is slanted in a direction substantially perpendicular to the axial direction of the shaft. This oblique fiber layer is configured by using two or more of the above polymerized prepreg sheets, and each polymerized prepreg sheet is wound with its winding initial position shifted in the circumferential direction. It is characterized by.

  As described above, when two or more polymerized prepreg sheets are used in forming the oblique fiber layer, by shifting the initial winding position of each polymerized prepreg sheet in the circumferential direction, due to the thickness difference generated at the winding end. Uneven thickness can be suppressed, and strength reduction and strength variation are suppressed.

  In addition, the shaft in the golf club of the present invention includes an oblique fiber layer made of a polymerized prepreg sheet in which prepreg sheets in which the reinforcing fiber pulling direction is oblique with respect to the axial direction of the shaft are overlapped in a direction substantially orthogonal to each other. The thickness of the oblique fiber layer is 0.1 mm or less, and the resin impregnation amount is 35 wt% or less.

  Thus, by setting the thickness of the oblique fiber layer of the shaft to 0.1 mm or less and the resin impregnation amount to 35 wt% or less, the shaft can be prevented from being broken and a high strength golf club can be obtained. There is little variation in strength, and a golf club with stable strength can be obtained. Further, by winding a thin-walled polymerized prepreg sheet with a small amount of resin impregnation, the specific strength and specific torque can be improved, and the weight can be reduced.

  The shaft of the golf club of the present invention further includes an axial fiber layer, and further includes an oblique fiber layer, or an oblique fiber layer and a circumferential fiber layer, and the oblique fiber layer and the circumferential fiber layer. At least one of the layers is characterized in that the resin impregnation amount is 30 wt% or less and the thickness is 0.05 mm or less. Here, the axial fiber layer is configured by winding an axial prepreg sheet, and the oblique fiber layer is wound by overlapping the oblique prepreg sheets so that the pulling directions cross each other. The circumferential fiber layer is formed by winding a circumferential prepreg sheet.

  As described above, by constituting at least one of the oblique fiber layer and the circumferential fiber layer with a resin impregnation amount of 30 wt% or less and a thickness of 0.05 mm or less, the shaft is prevented from being damaged and has high strength. The golf club can have a stable strength with little variation in strength. In addition, uneven thickness and directivity can be prevented, specific strength and specific torque can be improved, and the weight can be reduced.

  According to the present invention, it is possible to obtain a golf club with high strength by preventing the shaft from being broken, and with a stable strength with little variation in strength.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram illustrating an arrangement configuration example of a prepreg sheet wound around a cored bar 1 when forming a shaft. In this case, each prepreg sheet described later is wound around the cored bar 1 in an area of L = 1160 mm. The core 1 has a tip P1 (shaft tip) having a diameter of 5.0 mm, a rear end P2 (shaft rear end) having a diameter of 14.9 mm, and a diameter at a position P3 of 150 mm from the tip P1 is 6.2 mm. The diameter of the position P4 from the position P3 to 80 mm is configured to be 7.2 mm, and the steep taper 1a is formed in the range from the position P3 to the position P4. Thus, by forming the steep taper 1a in the tip region of the core metal 1, the tip region of the shaft to be molded is ensured in strength and has a smooth rigidity distribution.

  A prepreg sheet 3 serving as a reinforcing layer is wound around the core bar 1, and prepreg sheets 5, 7, 9, 11, and 13 serving as a main body layer forming the entire shaft are wound in order. And the prepreg sheet 15 used as a reinforcement layer in the front-end | tip area | region is wound. Each prepreg sheet is made by aligning carbon fibers in one direction and including a thermosetting synthetic resin such as an epoxy resin, a urethane resin, or an acrylic resin, and has the following configuration.

The prepreg sheet 3 serving as a reinforcing layer in the distal end region is obtained by aligning carbon fibers having an elastic modulus of 24 tonf / mm ^{2 in} the axial direction, a resin content of 30 wt%, and a fiber basis weight of 125 g / m ² . It has a thickness of 0.114 mm, and is cut into a size of 3 plies each for the cored bar 1 at both axial ends. The prepreg sheet 3 may be backed with a glass woven fabric.

The prepreg sheet 5 serving as the innermost layer constituting the main body layer is obtained by aligning carbon fibers having an elastic modulus of 40 tonf / mm ^{2 in} the circumferential direction, a resin content of 40 wt%, and a fiber basis weight of 28 g / m ^{2 has} a thickness of 0.032 mm and is cut into a size of 1.1 ply with respect to the core 1 at both ends in the axial direction.

On the prepreg sheet 5, prepreg sheets 7 a and 7 b in which carbon fibers having an elastic modulus of 40 tonf / mm ² are aligned obliquely with respect to the axial direction are aligned so that the alignment directions of the carbon fibers cross ( A prepreg sheet 7 formed by being overlapped (preferably ± 45 ° with respect to the axial direction) is wound. Each of the prepreg sheets 7a and 7b has a resin content of less than 30 wt%, preferably 25 wt% or less and 10 wt% or more, a fiber basis weight of 58 g / m ² , and a thickness of 0.048 mm. . In this case, the thickness may be 0.06 mm or less, and is preferably 0.048 mm or less as in this example. Each of the prepreg sheets 7a and 7b is 4 ply (8 ply in the overlapped state) on the front end side and 1.6 ply (3.2 ply in the overlapped state) on the base end side. It is cut by. The prepreg sheets 7a and 7b are preferably overlapped so that the initial winding position is shifted in the circumferential direction as shown in the figure. Further, in this configuration, each prepreg sheet 7a, 7b has at least 2 plies (both 4 plies) in the intermediate region.

The prepreg sheet 9 wound on the prepreg sheet 7 is made by aligning carbon fibers having an elastic modulus of 30 tonf / mm ^{2 in} the axial direction, the resin content is 30 wt%, and the fiber basis weight is 150 g / m ² and a thickness of 0.137 mm. And it is cut | judged to the magnitude | size by which each 2 plies with respect to the metal core 1 in the axial direction both ends.

The prepreg sheet 11 wound on the prepreg sheet 9 has the same configuration as the prepreg sheet 5 and is cut into a size of 1.1 ply with respect to the core metal 1 at both ends in the axial direction. . Further, the prepreg sheet 13 wound on the prepreg sheet 11 is obtained by aligning carbon fibers having an elastic modulus of 24 tonf / mm ^{2 in} the axial direction, a resin impregnation amount of 30 wt%, and a fiber basis weight of 125 g. / M ² and a thickness of 0.114 mm, and are cut into a size that is one-ply to the cored bar 1 at both ends in the axial direction.

  On the prepreg sheet 13, a prepreg sheet 15 serving as a reinforcing layer in the tip region is wound. The prepreg sheet 15 has the same configuration as the prepreg sheet 3 serving as a reinforcement layer on the innermost layer side. The prepreg sheet 15 is three-ply with respect to the tip end portion of the core metal 1 and is cut so as to be 0 ply at the position P3. ing.

  Each of the prepreg sheets configured as described above may be individually wound around the core 1 one by one, or each sheet may be preliminarily attached to each other and wound. . For example, the prepreg sheet 5 may be attached to the prepreg sheet 7 in advance, or the prepreg sheet 11 may be attached to the prepreg sheet 13 in advance. The prepreg sheet 7 described above is configured by pasting the prepreg sheets 7a and 7b in advance, but may be wound individually without being pasted together.

  As described above, the prepreg sheets 7a and 7b constituting the oblique fiber layer have a thickness of 0.048 mm and are not more than 0.1 mm even if they are stacked on two sheets, and the carbon fibers are drawn in the axial direction. Even when compared with the aligned prepreg sheets 9 and 13, the thickness is thin. Therefore, there is almost no wall thickness difference with respect to the prepreg sheets 9 and 13, and when these are wound, the occurrence of uneven thickness due to the wall thickness difference is suppressed in the overlapping portion of the winding end region, Reduced strength and variations in strength of the completed shaft are suppressed. In order to effectively obtain such an effect, the thickness of the prepreg sheets 7a and 7b constituting the oblique fiber layer is approximately half or less than the thickness of the prepreg sheets 9 and 13 in which the carbon fibers are aligned in the axial direction. It is good to configure.

  The prepreg sheet 7 may be configured by accurately aligning the prepreg sheets 7a and 7b. However, as shown in the figure, the prepreg sheets 7a and 7b are shifted in a direction perpendicular to the axial direction. By superposing in this way, it is possible to more effectively suppress the wall thickness change that occurs in the winding end region when the metal core 1 is wound. Furthermore, when the resin content of the prepreg sheets 7a and 7b constituting the oblique fiber layer is less than 30 wt%, preferably 25 wt% or less, the shaft can be lightened and strengthened. In this case, in order to ensure interlayer strength, the lower limit value is preferably 10 wt%.

  Further, as described above, it is preferable to interpose prepreg sheets 5 and 11 in which the thickness of the prepreg sheet constituting the main body layer is as thin as 0.032 mm and the carbon fibers are aligned in the circumferential direction. Thus, by providing the thin circumferential fiber layer, the movement of the carbon fibers of the adjacent prepreg sheets can be fixed, and the crushing strength of the entire shaft can be improved.

  As shown in FIG. 2, each prepreg sheet configured as described above is wound around a cored bar 1, and then subjected to conventional methods, that is, steps such as a heating step, a cooling step, decentering, polishing, and painting. A straight shaft 20 is formed. Then, as shown in FIG. 3, the club head 25 is inserted into the distal end portion of the shaft 20 thus formed, and the clip 30 is attached to the proximal end portion, whereby the golf club 40 is completed.

  In addition, when the prepreg sheets configured as described above are wound, in particular, when the prepreg sheets 7a and 7b cut to be 4 ply at the distal end side and 1.6 ply at the proximal end side are wound, the shaft The cross-sectional structure of the shaft in the range of 40% to 60% from the tip with respect to the total length (the range between the position P5 of L1 = 464 mm and the position P6 of L2 = 464 mm when the total shaft length is L-1160 mm) is shown in FIG. As shown, the oblique fiber layer is in a state in which each prepreg sheet 7a, 7b is wound two or more layers to increase the thickness.

  As described above, the shaft of the golf club is easily damaged in the range of 40% to 60% from the tip with respect to the entire length of the shaft due to torsion and the load of the head. By increasing the thickness of the fiber layer, the strength can be improved and damage can be suppressed.

Actually, in the shaft obtained by the arrangement configuration example of the prepreg shown in FIG. 1, the prepreg sheet 7 is configured as in the present embodiment as shown in the following table (a) and the same as the conventional one. A comparative experiment was conducted with the one constructed in (Mouth). In this case, the configuration of the prepreg sheet other than the prepreg sheet 7 (prepreg sheets 7a and 7b) is the same, and the shaft weight and thickness are also the same.

  The shaft with the configuration (A) obtained with the above configuration has a 21% improvement in torsional strength over the conventional (port) configuration shaft, and there is no variation in strength, and the strength can be stabilized and improved. It was. In addition, according to the shaft having the configuration (A), the torque is 6.6 degrees, and the torque is decreased by 0.4 degrees (5.7%) with respect to 7.0 degrees of the configuration shaft of the (mouth). I was able to. Furthermore, since the strength was improved and the torque was reduced, the weight of the shaft was reduced, and a golf club that was easy to swing and swing was obtained.

  Next, another embodiment of the present invention will be described with reference to FIGS. 5 (a) and 5 (b). Since the configuration of the cored bar 1 and the prepreg sheets 3, 5, 9, 11, and 13 used in this embodiment is the same as that of the first embodiment, description thereof is omitted.

  This embodiment is characterized by the prepreg sheet constituting the oblique fiber layer. That is, in the oblique fiber layer, the prepreg sheets 8a and 8b in which the reinforcing fiber assembling direction is obliquely inclined with respect to the axial direction of the shaft (preferably 45 ° with respect to the axial direction) It is configured by using two or more polymerization prepreg sheets 8 configured to overlap each other so as to be substantially orthogonal.

Each of the prepreg sheets 8a and 8b has a resin impregnation amount of less than 30 wt%, preferably 25 wt% or less and 10 wt% or more, and preferably has a basis weight of the fiber of 29 g / m ² and a thickness of 0.024 mm. It is configured. That is, the prepreg sheet 8 obtained by polymerizing the prepreg sheets 8a and 8b has a thickness of 0.048 mm, the same thickness as the prepreg sheets 7a and 7b in the first embodiment, and the fiber basis weight. Amount. Each of the prepreg sheets 8a and 8b constituting the polymerized prepreg sheet 8 is 4 plies (8 plies in the overlapped state) on the front end side and 1.6 ply (3. 2 ply). Therefore, by winding two or more such polymerized prepreg sheets 8 on top of each other, the front end side is 16 plies and the base end side is 6.4 plies, and in the middle region, at least 2 plies ( It is 4 plies or more with both the polymerized prepreg sheets.

And each above-mentioned superposition | polymerization prepreg sheet | seat 8 is wound with the winding initial position shifted | deviated to the circumferential direction with respect to the metal core 1, as shown in FIG.5 (b). That is, by shifting the winding initial position of each polymerization prepreg sheet 8 with respect to the metal core 1, it is possible to suppress the occurrence of uneven thickness due to the thickness difference in the overlapping portion of the winding end region. As a result, as in the first embodiment, it is possible to suppress a decrease in strength and variation in strength of the completed shaft. In addition, the oblique fiber layer of this embodiment includes two or more polymerized prepreg sheets 8 made of prepreg sheets 8a and 8b each having a basis weight of 29 g / m ² and a thickness of 0.024 mm. By being constituted by several turns, in particular, the torsional strength can be improved and the strength can be stabilized.

  Further, in the configuration shown in FIG. 5, the number of the two prepreg sheets 8, 8 may be one, and the width may be widened to increase the number of windings. The oblique fiber layer formed at this time is formed by winding such a prepreg sheet in a range of 1 ply or more, usually 2 to 6 plies. In this case, the thickness of the oblique fiber layer formed by the polymerized prepreg sheet is set to 0.1 mm or less, but is set to 0.07 mm or less so as to further improve specific strength, specific torque, and weight. And more preferably 0.04 mm or less. Further, the resin impregnation amount of such a polymerized prepreg sheet is set to 35 wt% or less, but it is preferable to make it 30 wt% or less so as to further improve specific strength, specific torque, and weight, and more preferably It is good to make it 25 wt% or less. Further, the prepreg sheets 3, 5, 9, 11, 13, 15 for forming layers other than the oblique fiber layers are the same as those in the embodiment shown in FIG. 5, but the winding position, the number of layers, etc. It may be set arbitrarily.

In the embodiment shown in FIG. 1 to FIG. 5, the prepreg sheet forming the oblique fiber layer, or the oblique fiber layer and the circumferential fiber layer, or the circumferential fiber layer is capable of preventing damage and unevenness in strength and stability. In order to effectively achieve the strength, uneven thickness and directionality prevention, specific strength, specific torque improvement, weight reduction, etc., the following configuration is preferable. That is, the resin impregnation amount is 30 wt% or less, preferably 25 wt% or less, more preferably 25 wt% to 10 wt%, and the wall thickness is 0.06 mm or less, preferably 0.04 mm or less, more preferably 0.035 mm to 0. and .005Mm, the fiber basis weight 40 g / ^{m 2} or less, preferably 35 g / ^{m 2} or less, more preferably 35~10g / ^{m 2.} In addition, it is good to comprise an axial direction fiber layer by winding the prepreg sheet | seat thickened more than equivalent above-mentioned layer. By using such a prepreg sheet, the bending rigidity can be improved efficiently and the molding operation can be easily performed. Further, when the number of turns is set to an integer number of turns rather than an odd number of turns, directionality and uneven thickness can be prevented. Note that the winding position and the number of windings of each prepreg sheet may be arbitrarily set.

  Further, the prepreg sheet 11 shown in FIGS. 1 and 5 may be an oblique prepreg sheet. The oblique sheet may be one sheet (the fiber assembling direction is only one direction), or two sheets are overlapped so that the assembling directions cross each other so that the initial winding positions are shifted in the circumferential direction. Things can be used. Alternatively, a polymerized prepreg sheet in which the prepreg sheet 11 is inclined may be used. In this case, the thickness of the oblique fiber layer formed by such a prepreg sheet is 0.1 mm or less, preferably 0.07 mm or less, more preferably 0.04 mm or less. The prepreg sheet 11 may be wound around the outermost layer, the innermost layer, or between the prepreg sheets 3 and 5, between the prepreg sheets 5 and 7, between the prepreg sheets 7 and 9, and the like. However, in consideration of efficiency such as improvement in torque, it is preferable to wind the prepreg sheet 9 outside. In addition, the torque of a shaft can be made small efficiently by winding the axial direction length of the layer formed by the prepreg sheet 11 in the range of 200 mm-500 mm from the shaft front-end | tip of a thin diameter part. However, it is not limited to such a range, it may be wound in a longer range, or it may be wound over the entire length of the shaft, or it may be wound only on the intermediate part or only on the original side part, for example, the grip part. . Alternatively, an oblique prepreg sheet may be wound on the distal end side, and a circumferential prepreg sheet may be wound on the proximal end side (the oblique prepreg sheet and the circumferential prepreg sheet are divided in the axial direction). In this case, the length and distribution of each prepreg sheet can be arbitrarily adjusted.

  Further, when the prepreg sheet 11 is constituted by an oblique prepreg sheet and is wound outside the oblique prepreg sheet 7, the amount of shear strain at the time of torsion load is larger than that of the oblique prepreg sheet 7. Therefore, the oblique prepreg sheet 11 is composed of a reinforcing fiber having a breaking elongation larger than that of the reinforcing fiber of the oblique prepreg sheet 7, or is configured to be aligned in a direction that does not break even if the breaking elongation is large. Good to do. The reinforcing fiber used in the oblique prepreg sheet 11 may be made of a material having a breaking elongation larger than that of the reinforcing fiber of the oblique prepreg sheet 7 by 5% or more, preferably 10% or more. Thereby, the torsional strength can be improved.

  However, in general, a material having a high elongation at break often has a low elastic modulus, so it is better to reduce the resin impregnation amount (increase the fiber ratio) in order to increase the specific elasticity, 35 wt% or less, Preferably it is 30 wt% or less, more preferably 10 wt% to 25 wt%. Thereby, torsional rigidity can be improved. As described above, the thickness of the prepreg sheet is 0.06 mm or less, preferably 0.04 mm or less, more preferably 0.035 mm to 0.005 mm.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, although carbon fibers are used as the reinforcing fibers of each prepreg sheet, organic fibers and inorganic fibers such as glass, boron, aramid, alumina, and the like can be used. Further, as described above, the present invention is to make the thickness of the prepreg sheet constituting the oblique fiber layer thinner than that of the prepreg sheet constituting the axial fiber layer, and to increase the thickness of the oblique fiber layer at the substantially central portion of the shaft. The prepreg constituting the oblique fiber layer, such as increasing the thickness (at least two layers in each assembling direction) and shifting the initial winding position when the prepreg sheet constituting the oblique fiber layer is polymerized. The specific configuration of the sheet is characteristic. For this reason, the elastic modulus of the reinforcing fiber, the resin content, the fabric weight, the thickness, and the number of plies in each of the other prepreg sheets are merely examples, and these specific examples About a structure, besides the structure of embodiment mentioned above, it can change variously according to the count of a golf club, a required characteristic, etc. For example, with respect to the auxiliary prepreg sheets for partial reinforcement such as the prepreg sheets 3 and 15, in addition to the fiber assembling direction being the axial direction as in the above-described configuration, the inclined fibers that are crossed. It may be configured in a direction, aligned in the circumferential direction, or a combination thereof. In particular, when used in combination, it is preferable to make it thinner than the main body prepreg sheet, for example, the prepreg sheets 7, 9, and 13.

It is a figure which shows the 1st Embodiment of this invention and is a figure which shows the example of arrangement | positioning structure of the prepreg sheet wound with respect to a metal core. The figure which shows the shaft formed by the arrangement structure of the prepreg sheet | seat of FIG. The figure which shows the golf club comprised by attaching a head and a grip to the shaft shown in FIG. The figure which shows the cross-sectional ellipse in the approximate center part of a shaft. It is a figure which shows the 2nd Embodiment of this invention, (a) is a figure which shows the example of arrangement | positioning structure of the prepreg sheet wound with respect to a metal core, (b) is the prepreg which comprises a diagonal fiber layer The figure which shows the superposition | polymerization state of a sheet | seat.

Explanation of symbols

1 cored bar 3,15 prepreg sheet (reinforcing layer)
5, 7, 9, 11, 13 Prepreg sheet (main layer)
20 shaft 25 club head 40 golf club

Claims (5)

  In a golf club having a shaft wound with a prepreg sheet in which reinforcing fibers are aligned in one direction and impregnated with a synthetic resin, the shaft is inclined in a direction in which the reinforcing fibers are aligned with respect to the axial direction of the shaft. The prepreg sheet is provided with an oblique fiber layer constituted by overlapping and winding so that the assembling directions cross, and the thickness of the prepreg sheet constituting the oblique fiber layer is 0.06 mm or less. A golf club characterized by that.   In a golf club having a shaft wound with a prepreg sheet in which reinforcing fibers are aligned in one direction and impregnated with a synthetic resin, the shaft is inclined in a direction in which the reinforcing fibers are aligned with respect to the axial direction of the shaft. The prepreg sheet is provided with an oblique fiber layer formed by overlapping and winding the prepreg sheets so that the assembling directions cross, and the oblique fiber layer has the number of windings of the shaft front end and the base end. A golf club comprising two or more layers wound in each assembling direction within a range of 40% to 60% from the tip with respect to the entire length of the shaft.   In a golf club having a shaft wound with a prepreg sheet in which reinforcing fibers are aligned in one direction and impregnated with a synthetic resin, the shaft is inclined in a direction in which the reinforcing fibers are aligned with respect to the axial direction of the shaft. It is provided with an oblique fiber layer made of a polymerized prepreg sheet constituted by superimposing prepreg sheets in a direction substantially perpendicular to the prepreg sheet, and this oblique fiber layer is constituted by using two or more of the polymerized prepreg sheets, Each polymer prepreg sheet is wound with an initial winding position shifted in the circumferential direction.   In a golf club having a shaft wound with a prepreg sheet in which reinforcing fibers are aligned in one direction and impregnated with a synthetic resin, the shaft is inclined in a direction in which the reinforcing fibers are aligned with respect to the axial direction of the shaft. It has an oblique fiber layer made of a polymerized prepreg sheet in which prepreg sheets are superposed in a direction substantially orthogonal to each other. The thickness of the oblique fiber layer is 0.1 mm or less, and the resin impregnation amount is 35 wt% or less. A golf club characterized by that.   In a golf club including a shaft wound with a prepreg sheet in which reinforcing fibers are aligned in one direction and impregnated with a synthetic resin, the shaft includes an axial fiber layer and an oblique fiber layer, or an oblique fiber. And at least one of the oblique fiber layer and the circumferential fiber layer is configured such that the resin impregnation amount is 30 wt% or less and the thickness is 0.05 mm or less. A golf club characterized by that.

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