JP4936131B2 - shaft - Google Patents

Description

  The present invention relates to a shaft of a golf club, a fishing rod, a tennis racket or the like.

  As is well known, since the shafts of golf clubs, fishing rods, tennis rackets and the like need to be light and strong, in recent years, fiber reinforced plastic laminates have been used in place of conventionally used metal shafts. The shaft which consists of is adopted.

  As a method of forming a shaft made of a fiber reinforced plastic laminate, a sheet winding method, a filament winding method, and a blade method are mainly used. Of these, the most commonly used sheet winding method is to cut a sheet formed by impregnating resin into fibers aligned in one direction into an arbitrary shape such as a fan shape or a trapezoidal shape, and then a tapered core material called a mandrel It is a method of forming a shaft by winding and curing a plurality of sheets. The shaft formed by this method has a drawback in that a step due to the overlap of the sheets occurs at the end of the sheet winding.

  The filament winding method is a method in which a shaft is formed by winding a fiber impregnated with resin around a rotated mandrel in a spiral manner without any gaps and curing. The shaft formed by this method has a drawback that the bending strength of the shaft is lowered because the fibers are not oriented in the axial direction of the mandrel.

  In the blade method, the central yarn that extends at an angle of 0 ° with respect to the axial direction of the mandrel and the braided yarn that is wound spirally counterclockwise while maintaining the angle + α ° with respect to the axial direction and the axial direction. This is a method of forming a shaft by curing the resin impregnated into the structure assembled by the braided yarn wound spirally clockwise while maintaining the angle -α °. The shaft formed by this method does not cause a step due to the overlapping of the sheets constituting the structure unlike the shaft formed by the sheet winding method, and the center yarn is knitted, so that the shaft is formed by the filament winding method. Compared with a shaft, it has many advantages that the bending strength is remarkably improved. In recent years, many improvements have been made to further improve the advantages of the blade method.

For example, in the following Patent Document 1, a braid knitted to have a symmetrical winding angle with respect to a shaft axis that is a central axis in the longitudinal direction of the shaft, and a braid knitted into the braid, A plurality of braid layers formed from a central yarn knitted so as to have a winding angle of 0 ° are laminated, and the braid layer is formed as the braid layer changes from an inner layer to an outer layer. A fiber reinforced plastic golf club shaft is disclosed in which the number of yarns of the braided yarn and the central yarn is sequentially increased to increase the yarn interval and reduce the gap portion.
JP-A-9-253255

  However, in the shaft formed by the conventional blade method including the invention described in Patent Document 1, it is difficult to arrange the axial yarn (center yarn) without deviation with respect to the shaft axis, and the bending of the shaft is difficult. Since the number of axial yarns (center yarns) positioned in the direction affects the degree of shaft deflection, it is necessary to specify the best bending direction for each shaft, and the quality is biased. There was a problem of end.

Therefore, the present invention has a technical problem of providing a shaft used for a golf club, a fishing rod, a tennis racket, etc. that bends in almost the same bending direction in any direction. As a result of repeating the experiment, it was arranged along the axis of the shaft by one side thread that is spirally wound in a counterclockwise direction with respect to the shaft axis and the other side thread that is spirally wound in a clockwise direction. In a shaft made of a multilayer fiber-reinforced plastic laminate in which at least one cylindrical layer having a structure in which axial yarns composed of fiber bundles are assembled together, each thread constituting the structure of the cylindrical layer is The side fastener and the other side of the yarn are crossed while changing the position of the shaft yarn and the front and back, respectively, and are also crossed in a diagonal lattice pattern. A lattice hole is formed by arranging lattice holes formed by crossing the side clasps in an oblique lattice shape along the axial direction of the shaft, and the lattice holes forming one lattice hole row adjacent to each other. And the other lattice hole row adjacent to each other, and by passing alternately through the lattice holes, the knowledge that the shaft yarn can be arranged around the axis of the shaft without a large deviation has been obtained. That achieved the objective.

  The technical problem can be solved by the present invention as follows.

That is, the shaft according to the present invention is formed in a taper shape as the shaft goes from the original end to the tip, and spirals clockwise with one side retaining thread wound spirally counterclockwise with respect to the axis of the shaft. A multilayer fiber reinforced plastic laminate in which at least one cylindrical layer having a structure in which axial yarns composed of fiber bundles arranged along the axis of the shaft are assembled together with the other side fastening yarn wound in a shape is laminated Each of the yarns constituting the structure of the cylindrical layer is a shaft made of a body, and both the fastening yarns are thinner than the axial yarns, and the one-side fastening yarns and the other-side fastening yarns are respectively the axial yarns. Crossing while changing the position of the front and back, and crossing each other in an oblique lattice shape, lattice holes formed by crossing the one side fastening thread and the other side fastening thread in a diagonal lattice form in the axial direction of the shaft Along A lattice hole row is formed by arranging them in a line, and the axial thread alternately passes through the lattice hole constituting one adjacent lattice hole row and the other lattice hole row adjacent to each other. When matching axial yarns pass through the same lattice hole, the fibers of the fiber bundles constituting both axial yarns are dispersed, and the openings of the lattice holes are covered with the fibers of the fiber bundles constituting both axial yarns. The fibers of the fiber bundle constituting the axial yarn are arranged without being biased with respect to the axis of the shaft, and the fibers of the fiber bundle constituting the axial yarn extend from the original end of the shaft toward the tip side, and the fiber bundle The number of fibers decreases as it goes toward the tip of the shaft .

  According to the present invention, at least one layer of the laminate constituting the shaft has a lattice hole array in which the lattice holes are arranged along the axial direction of the shaft by intersecting the one side retaining yarn and the other side retaining yarn in an oblique lattice shape. A cylindrical layer having a structure in which an axial thread made of fiber bundles is alternately passed through a lattice hole constituting one adjacent lattice hole row and a lattice hole constituting the other adjacent lattice hole row; Therefore, in the cylindrical layer, the fibers of the fiber bundle constituting the axial thread that passes through each lattice hole are dispersed and evenly arranged around the axis of the shaft, which affects the directionality of the shaft deflection. In addition, since the bending strength of the shaft is sufficiently strengthened by the shaft yarn incorporated in the cylindrical layer, the shaft of the shaft with respect to the tissue constituting other layers other than the cylindrical layer of the laminate is not provided. Completely or almost a set of axial threads extending in the axial direction It is not necessary to writing, thereby, it does not cause directionality to the degree deflection of the shaft under the influence of the other layers.

  Therefore, it can be said that the industrial applicability of the present invention is very high.

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

Embodiment 1 FIG.

  FIG. 1 is a perspective view showing a golf club using a shaft according to the present embodiment. FIG. 2 is a side view showing a cylindrical layer constituting the shaft of the golf club shown in FIG. FIG. 3 is an enlarged view showing the structure of the cylindrical layer shown in FIG. In these drawings, reference numeral 1 denotes a golf club including a grip 2, a shaft 3 extending from the grip 2, and a head 4 fixed to the tip of the shaft 3.

  The shaft 3 according to the present embodiment is composed of a laminate formed by laminating layers made of reinforced fiber plastics, and the cylindrical layer 5 shown in FIG. 2 is used as one layer of the laminate. Have.

  As shown in FIG. 3, the structure of the cylindrical layer 5 maintains an angle + α ° with respect to the shaft yarn 6 composed of fiber bundles extending at an angle ± 0 ° with respect to the axis of the shaft 3 and the axis of the shaft 3. And one side retaining thread 7 wound spirally counterclockwise and the other side retaining thread 8 wound spirally counterclockwise while maintaining an angle −α ° with respect to the axial direction of the shaft 3. Has been. Note that the same number of the both retaining threads 7 and 8 are wound around the axis of the shaft 3, and the retaining threads 7 and 8 are arranged at equal intervals.

  When the one-side retaining thread 7 and the other-side retaining thread 8 cross each other, the one-side retaining thread 7 crosses in an oblique lattice shape while maintaining the relationship of being positioned on the front side (the front side in FIG. 3), The rhomboid lattice holes 9 aligned vertically and horizontally are formed.

  The lattice holes 9 form lattice hole rows 10 arranged along the axial direction of the shaft 3 (the direction of the arrow X in FIG. 3). Adjacent lattice hole rows 10 are latticed with respect to the axial direction of the shaft 3. They are in close contact with 9 half holes.

  In the adjacent lattice hole row 10, two axial yarns are alternately passed through the lattice holes 9 constituting one adjacent lattice hole row 10 and the lattice holes 9 constituting the other adjacent lattice hole row 10. 6 is passing through. When attention is paid to one lattice hole row 10, the one lattice hole row 10 shares two axial yarns 6 with each of the left and right neighboring lattice hole rows 10, so a total of four axial yarns 6. Is going through.

  When the shaft yarn 6 passes through the adjacent lattice hole row 10, it passes through the lattice hole 9 constituting one adjacent lattice hole row 10 from the front side to the back side, and then the other adjacent lattice hole row 10. Through the lattice holes 9 from the back side to the front side, the shaft thread 6 inserted repeatedly, and the lattice holes 9 constituting one of the adjacent lattice hole rows 10 from the back side to the front side. A state in which the lattice holes 9 constituting the other lattice hole row 10 are passed through from the front side to the back side and the shaft yarns 6 are inserted into both lattice hole rows 10 by repeating this process. It has become.

  Therefore, when the adjacent shaft yarns 6 intersect one of the retaining yarns 7 and 8, one shaft yarn 6 intersects on the front side and the other shaft yarn 6 intersects on the back side. The fibers are separated by the fastening yarns 7 and 8, and the fibers of the fiber bundles constituting the biaxial yarns 6 are not bundled on the fastening yarns 7 and 8. On the other hand, when passing through the lattice hole 9, the partitioning by the retaining threads 7 and 8 is eliminated, and the fibers of the fiber bundles constituting the biaxial threads 6 are dispersed to be bundled together. As a result, as shown in FIG. 2, the openings of the lattice holes 9 are covered with the fibers of the fiber bundles constituting the axial yarn, and the axial yarn 6 is configured without being biased with respect to the axis of the shaft 3. The fibers of the fiber bundle are arranged.

  And after making resin penetrate | infiltrate with respect to the structure | tissue which consists of each fastening thread 7 and 8 and each axial thread 6, the cylindrical layer 5 is formed by hardening the said resin.

  Fibers of the fiber bundle constituting the axial yarn 6 are inorganic fibers such as carbon fibers, glass fibers, alumina fibers, silicon carbide fibers, organic fibers such as aramid fibers and polyparaphenylene benzobisoxazole fibers, boron fibers, stainless fibers, What is necessary is just to select from metal fibers, such as a titanium fiber. The fiber bundle is a bundle of 3000 to 24,000 single fibers made of the above fibers, more preferably 6000 to 12000. In addition, the fiber bundle may be composed of a single fiber or a mixture of two or more of the fibers.

  The fastening yarns 7 and 8 may be fiber bundles formed by bundling fibers, or may be yarns obtained by twisting fibers. What is necessary is just to select a fiber from the options similar to the said axial thread 6. FIG. In addition, it is preferable to use a thread that is thinner than the axial thread 6, and it is sufficient to use a thread of 100 to 2000 denier (11 to 222 tex), more preferably 600 to 1800 denier (66 ~ 200 tex) may be used.

  Examples of resins that penetrate each yarn include epoxy resins, unsaturated polyester resins, phenol resins, polyurethane resins, cross-linked epoxy-modified polyaminoamide resins, and the like, polypropylene resins, polyphenylene sulfide resins, polyether ether ketone resins, A thermoplastic resin such as polyether sulfone resin, ABS resin, or nylon resin may be used.

  The cylindrical layer 5 is only required to be laminated at least in one layer on the laminated body forming the shaft 3, and other layers other than the cylindrical layer 5 constituting the laminated body may be replaced with a conventional sheet winding method, a filament winding method, It may be formed by a blade method. When forming other layers of the laminate by the sheet winding method or the blade method, the shaft thread 6 constituting the structure of the cylindrical layer 5 can sufficiently maintain the strength of the shaft. It is possible to reduce or eliminate the axial yarn (the yarn passed in the axial direction of the shaft) constituting the structure so that little or no directionality occurs in the deflection state of the shaft.

Embodiment 2. FIG.

  The present embodiment is a modification of the tissue forming the cylindrical layer of the first embodiment. FIG. 4 is an enlarged view showing a modification of the tissue forming the cylindrical layer according to the present embodiment. FIG. 5 is an enlarged view showing another modification of the tissue forming the cylindrical layer according to the present embodiment. FIG. 6 is an enlarged view showing another modification of the tissue forming the cylindrical layer according to the present embodiment. FIG. 7 is an enlarged view showing another modification of the tissue forming the cylindrical layer according to the present embodiment. In these drawings, the same reference numerals as those in FIGS. 1 to 3 denote the same or corresponding parts.

  Modification 1: As shown in FIG. 4, the structure forming the cylindrical layer in this modification is such that the front and back positions are reversed each time the one side fastening thread 7 and the other side fastening thread 8 cross each other. It crosses in a diagonal lattice.

  In the adjacent lattice hole row 10, one axial thread so as to alternately pass through the lattice hole 9 constituting one adjacent lattice hole row 10 and the lattice hole 9 constituting the other adjacent lattice hole row 10. 6 is passing through. When attention is paid to one lattice hole row 10, the one lattice hole row 10 shares one axial thread with each of the left and right neighboring lattice hole rows 10, so that a total of two axial yarns 6 are formed. It will pass through.

  Modification 2: As shown in FIG. 5, the structure forming the cylindrical layer in this modification reverses the position of the front and back each time the one side fastening thread 7 and the other side fastening thread 8 intersect each other twice. While crossing in a diagonal grid.

  One or two adjacent lattice hole arrays 10 pass through the lattice holes 9 constituting one adjacent lattice hole array 10 and the lattice holes 9 constituting the other adjacent lattice hole array 10 alternately. Shaft thread 6 passes through. When attention is paid to one lattice hole row 10, the one lattice hole row 10 shares one axial thread with the left neighboring lattice hole row 10 and two right adjacent lattice hole rows 10. Therefore, a total of three shaft yarns 6 pass through.

  Modification 3: In the structure forming the cylindrical layer in this modification, as shown in FIG. 6, different numbers of the one-side fasteners 7 and the other-side fasteners 8 are wound around the shaft 3. The double side thread 7 is wound twice as many as the other side thread 8.

  The one-side retaining thread 7 intersects with the other-side retaining thread 8 so as to be positioned on the front side when the other-side retaining thread 8 intersects, and the other-side retaining thread 7 when the other-side retaining thread 8 intersects. By focusing on the other side fastening yarn 8 and the one side fastening yarn 7a, the one side fastening yarns 7b intersecting so as to be located on the back side with respect to the side fastening yarn 8 are aligned. The structure is the same as the structure of the cylindrical layer in the first embodiment.

  In addition, the one side retaining thread 7b runs so as to bisect a lattice hole formed by the other side retaining thread 8 and the one side retaining thread 7a intersecting in an oblique lattice shape.

  Modification 4: The structure forming the cylindrical layer in this modification has the same number of fasteners 7 and 8 wound around the shaft 3 as shown in FIG. And the other side retaining thread 8 are aligned so that four lines arranged at equal intervals are repeatedly arranged at intervals wider than the four intervals.

  Then, the one side retaining thread 7 and the other side retaining thread 8 intersect with each other in an oblique lattice shape while the positions of the front and back surfaces are reversed irregularly.

  In this modification, not all of the one side retaining thread 7 and all of the other side retaining thread 8 are arranged at equal intervals, so that the two retaining threads 7 and 8 have different sizes by crossing in a diagonal lattice pattern. Although the lattice hole 9 is formed, even if it is the adjacent lattice hole row 10 including the lattice hole row 10 in which any lattice hole 9 is arranged along the axial direction of the shaft 3, one adjacent lattice hole row 10. One or two shaft yarns 6 pass through alternately so as to pass through the lattice holes 9 constituting the lattice holes 9 constituting the other lattice hole rows 10 adjacent to each other.

  Each modification according to the present embodiment also has the same functions and effects as the structure forming the cylindrical layer in the first embodiment.

Embodiment 3 FIG.

  This embodiment is a modification of the cylindrical layer in the first embodiment. FIG. 8 is an enlarged view showing the structure on the former end side of the cylindrical layer according to the present embodiment. FIG. 9 is an enlarged view showing an intermediate structure of the cylindrical layer according to the present embodiment. FIG. 10 is an enlarged view showing the tissue on the distal end side of the cylindrical layer according to the present embodiment. In these drawings, the same reference numerals as those in FIGS. 1 to 3 denote the same or corresponding parts.

  The cylindrical layer 5 according to the present embodiment is gradually formed from the grip 2 side (original end side) toward the head 4 side (tip end side) in accordance with the shape of the shaft 3 formed in the tapered shape of the golf club 1. It is formed narrowly. Then, as shown in FIGS. 8 to 10, the size of the lattice holes 9 formed by the two retaining threads 7 and 8 constituting the cylindrical layer is gradually reduced from the original end side of the shaft 3 toward the front end side. In addition, the number of fibers of the fiber bundle constituting the axial yarn 6 of the cylindrical layer gradually decreases as it goes from the original end side of the shaft 3 to the front end side.

  Specifically, 1/3 of the fibers in the fiber bundle constituting the axial yarn 6 extending from the original end of the shaft 3 toward the front end side extend from the original end of the shaft 3 to a length of 1/3. 1/3 of the fiber extends from the original end of the shaft 3 to a length of 2/3, and 1/3 of the fiber extends from the original end of the shaft to the front end. The number of fibers in the fiber bundle constituting the shaft yarn 6 is decreased in three stages.

  According to the present embodiment, even if the lattice holes formed by the two fastening threads constituting the structure of the cylindrical layer are gradually reduced from the original end side of the shaft toward the front end side, each lattice hole is accordingly accompanied. Since the number of fibers in the fiber bundle that passes through is adjusted, even in a tapered shaft, an equal amount of fibers can be arranged around the shaft axis on the front end side and the original end side.

  In the present embodiment, the number of fibers of the fiber bundle constituting the shaft yarn 6 is decreased in three steps as it goes from the original end side of the shaft 3 to the tip end side, but is divided in two steps. It may be reduced or may be reduced in four or more stages. Further, it may be gradually reduced steplessly.

  In each of the above embodiments, the shaft of a golf club is illustrated, but the shaft according to the present invention can also be used for fishing rods, tennis rackets and the like.

1 is a perspective view showing a golf club using a shaft according to Embodiment 1. FIG. It is the side view which showed the cylindrical layer which comprises the shaft of the golf club shown in FIG. It is the enlarged view which showed the structure | tissue of the cylindrical layer shown in FIG. 6 is an enlarged view showing a structure forming a cylindrical layer according to Modification 1. FIG. 10 is an enlarged view showing a structure forming a cylindrical layer according to Modification 2. FIG. 10 is an enlarged view showing a structure forming a cylindrical layer according to Modification 3. FIG. It is the enlarged view which showed the structure | tissue which forms the cylindrical layer which concerns on the modification 4. 10 is an enlarged view showing a structure on the former end side of a cylindrical layer according to Embodiment 3. FIG. 10 is an enlarged view showing an intermediate structure of a cylindrical layer according to Embodiment 3. FIG. 10 is an enlarged view showing a tissue on the tip side of a cylindrical layer according to Embodiment 3. FIG.

DESCRIPTION OF SYMBOLS 1 Golf club 2 Grip 3 Shaft 4 Head 5 Cylindrical layer 6 Axle thread 7 One side fastening thread 8 The other side fastening thread 9

Claims (1)

The shaft is formed in a taper shape as it goes from the original end to the tip, and one side retaining thread that is spirally wound in a counterclockwise direction with respect to the shaft axis and the other side retaining thread that is spirally wound in a clockwise direction A shaft made of a multilayer fiber-reinforced plastic laminate in which at least one cylindrical layer having a structure in which axial yarns made of fiber bundles arranged along the axis of the shaft are assembled together is laminated, Each thread that makes up the structure of the cylindrical layer is such that both the retaining threads are thinner than the axial thread, and the one-side retaining thread and the other-side retaining thread cross each other while changing the position of the axial thread and the front and back sides. And the lattice holes formed by intersecting the one-side fasteners and the other-side fasteners in the oblique lattice shape are arranged along the axial direction of the shaft. The axial yarns pass alternately through the lattice holes constituting one adjacent lattice hole row and the other adjacent lattice hole row, and the adjacent axial yarns are the same lattice hole. covered by the fibers of the fiber bundle in which the opening of the grating holes in a state in which the fibers are dispersed in the fiber bundles constituting the both axes yarns constituting both axes thread when passing through the by bias with respect to the axis around the shaft The fibers of the fiber bundle constituting the axial yarn are arranged, the fibers of the fiber bundle constituting the axial yarn extend from the original end of the shaft toward the tip side, and the number of fibers of the fiber bundle is the tip of the shaft. A shaft composed of a laminate made of fiber-reinforced plastic, characterized in that the shaft decreases as it goes to .

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