Blanks and handles

Abstract

To provide a ball handle and a blank in which the division is avoided when damaged.SOLUTION: A blank 17 for making up a ball handle comprises resin strengthened by carbon fibers. The blank 17 exhibits a cylindrical shape, and has a four-layer structure. Sequentially from the inside of the blank 17 toward the outside thereof, there are laminated a first fiber reinforced resin layer 31, an intermediate layer 33, a second fiber reinforced resin layer 32 and a surface coating layer 34. In the first fiber reinforced resin layer 31 and the second fiber reinforced resin layer 32, carbon fibers are arranged along the circumferential direction. A division prevention wire rod 35 is embedded in the intermediate layer 33, and is fixed. The division prevention wire rod 35 comprises the twisted yarn with multiple polyethylene fibers knitted therein. The division prevention wire rod 35 is arranged along the axial direction 21 straight.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates primarily to the structure of a blank which is a component part of a fishing rod, and to a fishing rod handle provided with this blank. [Background technology]

[0002] In this specification, the term "fishing rod" includes not only a fishing rod used to operate a fishing tackle or catch a fish that has been caught, but also, for example, a fishing rod handle used to catch a fish that has been caught.

[0003] A fishing rod generally consists of multiple blanks, which are connected longitudinally via a predetermined joint structure. At fishing spots, there are obstacles (typically, large overhanging reefs) that can hinder an angler from operating a fishing rod, and in some cases, the fishing rod may come into contact with such obstacles. For example, when fishing on reefs, the angler extends the fishing rod handle and scoops up the fish with a dip net attached to the handle. During this process, the dip net and the dip net used to scoop up the fish may be buffeted by swells near the reef, causing the dip net to be smashed against the reef and break or break apart. When such an accident occurs, the angler loses not only the dip net handle, but also the fish and dip net. This can be a serious tragedy, especially when the fish caught in the dip net is large, and can also cause psychological shock.

[0004] To prevent accidents such as the breaking of a fishing rod, a reinforcement design that not only provides practical mechanical strength but also prevents damage so that the rod will not be easily damaged when colliding with an obstacle is sufficient. However, because fishing rods are generally made of so-called CFRP, even if strength is improved to a certain extent by, for example, designing a thick-walled structure, there is a limit to how much strength can be increased. Furthermore, since the fishing rod handle must be designed to be light enough that a fisherman operating the fishing rod with one hand can use the other, there is an upper limit to the allowable weight, making it unrealistic to construct the fishing rod handle out of metal, for example. In other words, it is practically extremely difficult to design a fishing rod that prevents damage.

[0005] Although it has been difficult to prevent damage to the fishing rod handle, means have been proposed for preventing a damaged fishing rod handle from breaking apart (see, for example, Patent Document 1). In the fishing rod disclosed in Patent Document 1, a breakage prevention filament is spirally wound when the prepreg is wound around the mandrel during blank molding. It is said that the breakage prevention filament prevents the blank molded in this manner from breaking apart even if it is damaged. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 2659580 Summary of the Invention [Problem to be solved by the invention]

[0007] The practical mechanical strength of a blank depends on the orientation of the fibers contained in the prepreg. That is, it is important that the fibers extend in the circumferential direction of the molded blank (the formation of a so-called "breech layer"). Generally, the brace layer is arranged in the innermost and outermost layers of the blank.

[0008] In the fishing rod disclosed in the above document, the split-preventing filaments are arranged in a spiral shape above or below the prepreg (between the mandrel and the prepreg). In other words, the split-preventing filaments are arranged adjacent to the barbed layer on the outside or inside. Therefore, during pressure molding, the split-preventing filaments cause the fibers extending in the circumferential direction of the blank to be displaced and meander in different directions, significantly reducing the practical strength of the molded blank.

[0009] Therefore, a main object of the present invention is to provide a lightweight blank that can avoid breaking even if damaged while preventing a decrease in practical mechanical strength. [Means for solving the problem]

[0010] (1) The blank according to the present invention comprises a first fiber-reinforced resin layer provided radially inward and having reinforcing fibers extending circumferentially, a second fiber-reinforced resin layer provided radially outward from the first fiber-reinforced resin layer and having reinforcing fibers extending circumferentially, and an intermediate layer provided between the first fiber-reinforced resin layer and the second fiber-reinforced resin layer, the intermediate layer having anti-severance wire extending along the axial direction.

[0011] The intermediate layer forms the core of the blank as a structure. A first fiber-reinforced resin layer and a second fiber-reinforced resin layer are arranged radially inside and outside this intermediate layer, respectively, forming a so-called barbed layer. It is important that the reinforcing fibers contained in the first fiber-reinforced resin layer and the second fiber-reinforced resin layer are aligned in the circumferential direction to achieve a predetermined strength (mainly bending strength). If these reinforcing fibers are displaced anisotropically or meander, the mechanical strength of the blank will decrease.

[0012] In this invention, the split prevention wire is embedded in the blank, so even if the blank is broken, it will not split into multiple pieces. In addition, the split prevention wire is located between the first fiber-reinforced resin layer and the second fiber-reinforced resin layer and extends in the axial direction so as to be covered by the intermediate layer. Therefore, when the blank is sintered, the split prevention wire prevents the reinforcing fibers from being displaced anisotropically or meandering, and a decrease in the mechanical strength of the blank is prevented.

[0013] (2) The intermediate layer may contain reinforcing fibers extending in the axial direction.

[0014] This configuration improves the axial tensile strength of the blank, and therefore improves the bending strength of the blank as a structure.

[0015] (3) The intermediate layer may contain reinforcing fibers extending in the circumferential direction.

[0016] This configuration improves the tensile strength of the blank in the circumferential direction, thereby further improving the torsional strength of the blank as a structure.

[0017] (4) The intermediate layer may contain reinforcing fibers extending in a direction intersecting the axial direction.

[0018] This configuration further improves the buckling (crushing) strength of the blank as a structure.

[0019] (5) The intermediate layer may include an inner intermediate layer located radially inward from the splitting prevention wire material and an outer intermediate layer located radially outward from the splitting prevention wire material.

[0020] In this configuration, the anti-splitter wire is embedded in the intermediate layer, which reliably maintains the reinforcing fibers contained in the first and second fiber-reinforced resin layers in a circumferentially aligned state. Therefore, the anti-splitter wire reliably prevents the reinforcing fibers from being displaced anisotropically or meandering when the blank is fired.

[0021] (6) At least one of the inner intermediate layer and the outer intermediate layer preferably contains reinforcing fibers extending in the axial direction.

[0022] This configuration improves the axial tensile strength of the blank, and therefore improves the bending strength of the blank as a structure.

[0023] (7) At least the other of the inner intermediate layer and the outer intermediate layer preferably contains reinforcing fibers extending in the circumferential direction.

[0024] This configuration improves the tensile strength of the blank in the circumferential direction, thereby further improving the torsional strength of the blank as a structure.

[0025] (8) At least one of the inner intermediate layer and the outer intermediate layer preferably contains reinforcing fibers extending in a direction intersecting the axial direction.

[0026] This configuration further improves the buckling (crushing) strength of the blank as a structure.

[0027] (9) At least one of the inner intermediate layer and the outer intermediate layer preferably contains reinforcing fibers extending in the axial direction.

[0028] This configuration improves the axial tensile strength of the blank, and therefore improves the bending strength of the blank as a structure.

[0029] (10) At least the other of the inner intermediate layer and the outer intermediate layer preferably contains reinforcing fibers extending in the circumferential direction.

[0030] This configuration improves the tensile strength of the blank in the circumferential direction, thereby further improving the torsional strength of the blank as a structure.

[0031] (11) It is preferable that the reinforcing fibers contained in the inner intermediate layer and the outer intermediate layer extend in directions that intersect with each other.

[0032] This configuration further improves the axial and circumferential tensile strength of the blank, thereby further improving the bending strength, torsional strength, and buckling strength of the blank as a structure.

[0033] (12) It is preferable that the anti-breakage wire extends spirally along the axial direction.

[0034] In this configuration, the anti-severance wire further improves the mechanical strength of the blank as a structure.

[0035] (13) A ball handle may be constructed using the blank. [Effects of the Invention]

[0036] According to this invention, the breakage prevention wire is provided in the middle layer that forms the core of the blank, which prevents the reinforcing fibers that form the so-called reverse layer from being displaced anisotropically or meandering during the molding of the blank. Therefore, the practical mechanical strength of the blank and therefore the ball handle made from this blank is maintained, and even if the blank or the ball handle is damaged, it is possible to avoid breakage. [Brief explanation of the drawings]

[0037] [Figure 1] FIG. 1 is a perspective view showing the appearance of a ball handle according to one embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing a cross-sectional structure of a blank that constitutes a ball handle. [Figure 3] FIG. 3 is an enlarged view of a main part in FIG. [Figure 4] FIG. 4 is a diagram schematically showing the manufacturing process of the blank. [Figure 5] FIG. 5 is a diagram schematically showing the manufacturing process of the blank. [Figure 6] FIG. 6 is a diagram showing a schematic diagram of the manufacturing process of the blank. [Figure 7] FIG. 7 is a diagram showing a schematic diagram of the manufacturing process of the blank. [Figure 8] FIG. 8 is a diagram showing a schematic diagram of the manufacturing process of the blank. [Figure 9] FIG. 9 is a diagram schematically showing the manufacturing process of the blank. [Figure 10] FIG. 10 is an enlarged cross-sectional view of a part of a shaft of a ball according to another embodiment of the present invention. [Figure 11] FIG. 10 is a diagram schematically illustrating a cross-sectional structure of a blank according to a design modification example of one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0038] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. It should be noted that this embodiment is merely one aspect of the ball handle of the present invention, and it goes without saying that the implementation may be changed without departing from the spirit of the present invention.

[0039] <Structure of the handle>

[0040] 1 is a perspective view of the appearance of a ball handle 10 according to one embodiment of the present invention, showing the ball handle 10 in use.

[0041] As shown in the figure, a landing net 12 is attached to the fishing handle 10, and the two are used in an assembled state during actual fishing. That is, the fishing handle 10 is extendable along the axial direction 21, and the landing net 12 is detachably attached to the tip of the fishing handle 10. When landing a fish, the angler operates the fishing handle 10 to extend it, and uses the landing net 12 to scoop up the fish that have been caught.

[0042] The landing net 12 has a net body 13 and a frame body 14 that supports it. The frame body 14 has a shaft 16, which is formed with a male screw 15. The shaft 16 is screwed onto the tip of the ball handle 10, and the landing net 12 is fixed to the ball handle 10.

[0043] The hilt 10 has four blanks 17-20 (hilt body 11), which are joined together in a so-called retractable fashion. That is, the blanks 17-20 are cylindrical, and the other blanks 19, 18, 17 are nested in order inside the largest-diameter blank 20. When the hilt 10 is used, the blanks 17-19 are pulled out from the blank 20 in the axial direction 21, and the blank 17 is positioned at the most distal end of the hilt body 11. In this embodiment, the hilt body 11 is made up of four blanks 17-20, but the number of blanks constituting the hilt body 11 is not particularly limited.

[0044] A female thread is formed on the inside of the tip of the blank 17, and a cap 23 is fitted around the tip. The female thread may be formed directly on the inner peripheral surface of the blank 17, or, for example, a sleeve may be fitted inside the tip and the female thread may be formed on this sleeve. The male thread 15 is threaded onto this female thread, and the landing net 12 is removably attached to the landing net handle 10. The cap 23 is made of, for example, rubber, and its outer shape is shaped so that it can be removably fitted onto the tip of the blank 20. A butt plug 22 is provided at the rear end of the blank 20. This butt plug 22 has a known structure and is threaded onto the blank 20 in a removably manner.

[0045] 2 is a diagram schematically showing the cross-sectional structure of the blank 17. FIG. 3 is an enlarged view of a main part of FIG.

[0046] The blank 17 is made of resin and has a cylindrical outer shape. The resin constituting the blank 17 is generally a thermosetting resin (typically an epoxy resin), and the cylindrical blank 17 is formed by a heat treatment, as described below. This resin is preferably reinforced with fiber. Carbon fiber is generally used as the fiber reinforcing the resin, but glass fiber or other fibers may also be used. Note that the blanks 18-20 are also made of resin, like the blank 17. The outer shape of each blank 17-20 is designed to form a predetermined taper. The outer diameter of each blank 17-20 is smallest at the front end (left side in FIG. 1 ) in the axial direction 21 and gradually increases toward the rear end (right side in FIG. 1 ). The outer diameter of the rear end of the blank 17 is set larger than the inner diameter of the front end of the blank 18. Therefore, the blank 17 disposed inside the blank 18 fits into the blank 18 when pulled out of the blank 18 along the axial direction 21. In the other blanks 18 to 20, the relationship between adjacent blanks is similar to that of blanks 17 and 18.

[0047] 2 and 3, the peripheral wall 24 of the blank 17 has a four-layer structure. That is, a first fiber-reinforced resin layer 31, an intermediate layer 33, a second fiber-reinforced resin layer 32, and a surface coating layer 34 are laminated in this order from the inside along the radial direction of the blank 17, and are integrally formed. The first fiber-reinforced resin layer 31 and the second fiber-reinforced resin layer 32 are respectively disposed on the inside and outside in the radial direction of the blank 17, with the intermediate layer 33 sandwiched therebetween. A split-prevention wire 35 is provided in this intermediate layer 33.

[0048] The first fiber-reinforced resin layer 31 according to this embodiment is made of epoxy resin and is reinforced using carbon fibers as reinforcing fibers. However, it goes without saying that thermosetting resins other than epoxy resin may also be used. In this embodiment, the carbon fibers contained in the first fiber-reinforced resin layer 31 extend along the circumferential direction of the blank 17. In other words, the first fiber-reinforced resin layer 31 forms a so-called reverse-grain layer. The second fiber-reinforced resin layer 32 according to this embodiment also has the same composition as the first fiber-reinforced resin layer 31 and is made of epoxy resin or the like reinforced with carbon fibers. The second fiber-reinforced resin layer 32 is also a reverse-grain layer, and the carbon fibers contained in the second fiber-reinforced resin layer 32 extend along the circumferential direction of the blank 17.

[0049] The intermediate layer 33 according to this embodiment forms the core of the blank 17 as a structure. The intermediate layer 33 is made of epoxy resin and is reinforced using carbon fibers as reinforcing fibers. The resin constituting this intermediate layer 33 may also be other thermosetting resins instead of epoxy resin. The carbon fibers contained in the intermediate layer 33 extend along the axial direction 21. In other words, the intermediate layer 33 forms a so-called forward grain layer. However, the carbon fibers contained in the intermediate layer 33 may also extend along the circumferential direction of the blank 17. In this case, the intermediate layer 33 forms a reverse grain layer. Furthermore, the carbon fibers contained in the intermediate layer 33 may also extend along a direction intersecting the axial direction 21 of the blank 17.

[0050] However, the carbon fibers contained in the intermediate layer 33 may extend in two different directions. That is, some of the carbon fibers may extend along the circumferential direction of the blank 17, and other parts may extend along the axial direction 21 of the blank 17, forming a lattice. Furthermore, some of the carbon fibers may intersect with the axial direction 21 at an angle (θ), while other parts may intersect with the axial direction 21 at an angle (-θ). That is, some of the carbon fibers and other parts may extend in directions that intersect symmetrically with respect to the axial direction 21 of the blank 17, and be arranged in a lattice pattern. Note that the intermediate layer 33 does not have to contain carbon fibers or other reinforcing fibers.

[0051] A feature of the fishing lure handle 10 according to this embodiment is that the intermediate layer 33 includes a split-prevention wire 35. The split-prevention wire 35 is typically a twisted yarn made of multiple polyethylene fibers braided together. In other words, a type of fishing line known as a "PE line" can be used. However, the material for the split-prevention wire 35 is not particularly limited. As long as sufficient tensile strength (approximately 80 kgf / mm2) is ensured, aramid fiber or metal (preferably a shape-memory alloy) can also be used. Shape-memory alloys include titanium-nickel alloys and iron-manganese-silicon alloys. The split-prevention wire 35 extends straight from the leading end to the trailing end of the blank 17 along the axial direction 21. The split-prevention wire 35 is disposed inside the intermediate layer 33 during the molding of the blank 17, as described below, and is therefore firmly attached to the intermediate layer 33 in the molded blank 17.

[0052] The surface coating layer 34 is formed by applying a predetermined paint to the outer surface of the molded blank 17. As this paint, epoxy-based and / or urethane-based paint can be used.

[0053] As shown in FIG. 3 , the thickness 36 of the blank 17 is the sum of the thicknesses 37 to 40 of the first fiber-reinforced resin layer 31, the second fiber-reinforced resin layer 32, the intermediate layer 33, and the surface coating layer 34. The thickness 37 of the first fiber-reinforced resin layer 31 is set to 0.02 mm to 0.30 mm, the thickness 38 of the second fiber-reinforced resin layer 32 is set to 0.02 mm to 0.30 mm, the thickness 39 of the intermediate layer 33 is set to 0.15 mm to 1.50 mm, and the thickness 40 of the surface coating layer 34 is set to 0.02 mm to 0.50 mm. These thicknesses 37 to 39 are set appropriately depending on the strength design of the blank 17. In this embodiment, the outer diameter of the split-prevention wire 35 is set to approximately 0.7 mm, but can be set appropriately within the range of 0.15 mm to 1.50 mm to correspond to the thickness 39 of the intermediate layer 33. That is, the separation prevention wire 35 is embedded in the intermediate layer 33 .

[0054] Blanks 18-20 have the same structure as blank 17. However, because handle body 11 is connected in a telescopic manner, the outer and inner diameters of blanks 18-20 and thicknesses 37-39 of first fiber-reinforced resin layer 31, second fiber-reinforced resin layer 32, and intermediate layer 33 are appropriately designed.

[0055] <Blank manufacturing method>

[0056] Each of the blanks 17 to 20 is formed in the following manner: Figures 4 to 9 are diagrams schematically showing the manufacturing process of the blank 17.

[0057] The blank 17 is manufactured by heat-treating (curing) the prepreg wrapped around the mandrel and then pulling out the mandrel. That is, the blank 17 is manufactured through the following steps: (1) cutting process, (2) rolling process, (3) taping process, (4) heat-treating process, (5) core-removing and tape-removing process, and (6) finishing and cutting process.

[0058] (1) Cutting process

[0059] The prepreg is a sheet in which the reinforcing fibers (carbon fibers in this embodiment) are impregnated with resin. An example of the resin is epoxy resin. The mechanical strength of the blank 17 is determined by the tensile modulus of elasticity of the reinforcing fibers. As shown in FIG. 4, this prepreg 41 is cut to a predetermined size to form a cross pattern 42. In this embodiment, the cross pattern 42 corresponding to the first fiber reinforced resin layer 31, the second fiber reinforced resin layer 32, and the intermediate layer 33 is cut. The size and shape of the cross pattern 42 are determined depending on the length, outer diameter, rigidity, and other mechanical strength factors of the blank 17.

[0060] (2) Rolling process

[0061] 5, the cross pattern 42a that forms the first fiber-reinforced resin layer 31 (see FIG. 3) is positioned relative to the mandrel 43 and completely wound around the mandrel 43. At this time, the carbon fibers contained in the cross pattern 42a are wound along the circumferential direction of the mandrel 43 (the same direction as the circumferential direction of the molded blank 17). In this embodiment, the cross pattern 42a is a single sheet, but depending on the strength design of the blank 17, multiple cross patterns 42a may be wound around the mandrel 43 so as to be overlapped.

[0062] As shown in FIG. 6, the cross pattern 42b forming the intermediate layer 33 (see FIG. 3) is wound on the cross pattern 42a in an overlapping manner. At this time, the carbon fibers contained in the cross pattern 42b are wound along the axial direction of the mandrel 43 (the same direction as the axial direction 21). In addition, the splitting prevention wire 35 is disposed straight on the cross pattern 42a along the axial direction 21. In this embodiment, the cross pattern 42b is cut so as to make a complete circle around the outside of the cross pattern 42a (see FIG. 3). Therefore, the edges of the cross pattern 42b face each other in the circumferential direction on the cross pattern 42a, and the splitting prevention wire 35 is disposed so as to be sandwiched between the edges of the cross pattern 42b, as shown in FIG. 3. However, the cross pattern 42b may also be cut so as to overlap on the cross pattern 42a. Although FIG. 6 shows the cross pattern 42b as a single sheet, multiple cross patterns 42b may be wound in an overlapping manner depending on the strength design of the blank 17.

[0063] In the present embodiment, the cross pattern 42b is wound around the mandrel 43 so that the carbon fibers extend along the axial direction 21. However, the cross pattern 42b may also be wound so that the carbon fibers included in the cross pattern 42b extend along the circumferential direction or a direction intersecting with the axial direction 21. Furthermore, when multiple cross patterns 42b are wound, the carbon fibers may be wound so as to form a lattice. For example, one cross pattern 42b may be wound around the mandrel 43 so that the carbon fibers extend along the axial direction 21, and another cross pattern 42b may be wound around the mandrel 43 so that the carbon fibers extend along the circumferential direction. Furthermore, one cross pattern 42b may be wound around the mandrel 43 so that the carbon fibers intersect with the axial direction 21 at an angle (θ), and another cross pattern 42b may be wound around the mandrel 43 so that the carbon fibers intersect with the axial direction 21 at an angle (−θ). The cross patterns 42b do not necessarily need to contain carbon fibers.

[0064] 7, the cross pattern 42c that forms the second fiber-reinforced resin layer 32 (see FIG. 3) is wound so as to overlap on top of the cross pattern 42b. At this time, the carbon fibers contained in the cross pattern 42c are wound along the circumferential direction of the mandrel 43. In this embodiment, the cross pattern 42c is a single sheet, but similar to the cross patterns 42a and 42b, a plurality of cross patterns 42c may be wound overlapping each other.

[0065] (3) Taping process

[0066] 8, a tape 45 is wrapped around the cross pattern 42 to prevent the cross pattern 42 from peeling off from the mandrel 43. The tape 45 is made of, for example, polypropylene, and is wrapped around the cross pattern 42 and the mandrel 43 to fasten them together.

[0067] (4) Heat treatment process

[0068] 9(a), the cross pattern 42 formed into a tubular shape and taped is placed in a furnace 46 together with a mandrel 43. This furnace is typically an electric oven, and the cross pattern 42 is heated, for example, in an atmosphere of 140°C for 120 minutes. As a result, the epoxy resin contained in the cross pattern 42 hardens while being reinforced by the carbon fibers, and a lightweight blank 17 with excellent tensile strength and bending strength is baked.

[0069] (5) Core removal and tape removal process

[0070] After the heat treatment process is completed, as shown in FIG. 1(b), the mandrel 43 is pulled out from the blank 17. The tape 45 is removed from the fired blank 47.

[0071] (6) Finishing and cutting process

[0072] The cylindrical blank 17 is cut to a predetermined length. The surface of the blank 17 is polished and then coated with a desired coating. This coating forms the surface coating layer 34.

[0073] The other blanks 18 to 20 are manufactured in the same manner. The cap 23 is attached to the leading end of the blank 17, and the butt plug 22 is attached to the trailing end (see FIG. 1). These steps are well known, so a description thereof will be omitted.

[0074] <Effects of the handle of the ball>

[0075] The blanks 17-20 manufactured in this manner are joined in a telescopic fashion to form the handle body 11. As shown in Figure 1, a landing net 12 is attached to the handle body 11, and an angler can use the landing net 12 to operate the handle body 11 to scoop up fish. In this landing net handle 10, as shown in Figure 3, a first fiber-reinforced resin layer 31 and a second fiber-reinforced resin layer 32, which are barbed layers, sandwich an intermediate layer 33. Therefore, the carbon fibers contained in the first fiber-reinforced resin layer 31 and the second fiber-reinforced resin layer 32 ensure sufficient strength (mainly bending strength) of the blanks 17-20, allowing the angler to comfortably operate the landing net handle 10 when actually fishing.

[0076] Even if the handle body 11 hits a rocky shore during actual fishing, the breakage prevention wire 35 embedded in the intermediate layer 33 prevents the blanks 17-20 from breaking even if they are damaged. This prevents the blanks 17-20 from breaking and separating, resulting in the loss of the landing net 12 and the fish scooped up by the landing net 12. Furthermore, the breakage prevention wire 35 is covered by the intermediate layer 33, positioned between the first fiber-reinforced resin layer 31 and the second fiber-reinforced resin layer 32, and extends in the axial direction 21. Therefore, when the blanks 17-20 are fired, the breakage prevention wire 35 prevents the carbon fibers contained in the first fiber-reinforced resin layer 31 and the second fiber-reinforced resin layer 32 from being displaced anisotropically or meandering. As a result, the incorporation of the breakage prevention wire 35 into the intermediate layer 33 prevents a decrease in the mechanical strength of the blanks 17-20.

[0077] When the carbon fibers contained in the intermediate layer 33 extend in the axial direction 21, i.e., when the intermediate layer 33 forms a forward-grain layer, the tensile strength of the blanks 17 to 20 in the axial direction 21 is improved. Therefore, the bending strength of the blanks 17 to 20 is improved. Furthermore, when the carbon fibers contained in the intermediate layer 33 extend in the circumferential direction, i.e., when the intermediate layer 33 forms a reverse-grain layer, the tensile strength of the blanks 17 to 20 in the circumferential direction is improved. Therefore, the torsional strength of the blanks 17 to 20 is further improved. Furthermore, when the carbon fibers contained in the intermediate layer 33 extend in a direction intersecting the axial direction 21, the buckling (crushing) strength of the blanks 17 to 20 is further improved.

[0078] <Other embodiments>

[0079] FIG. 10 is an enlarged cross-sectional view of a part of a shaft 50 of a ball according to another embodiment of the present invention.

[0080] The ball handle 50 according to this embodiment differs from the ball handle 10 in that the intermediate layer 51 is divided into an inner intermediate layer 52 and an outer intermediate layer 53, with the anti-severance wire 35 sandwiched between them. The other configurations of the ball handle 50 are the same as those of the ball handle 10.

[0081] As shown in Figure 10, the peripheral wall 24 of the blanks 17-20 that make up the handle 50 of the ball has a five-layer structure. That is, from the inside along the radial direction of the blanks 17-20, a first fiber-reinforced resin layer 31, an inner intermediate layer 52, an outer intermediate layer 53, a second fiber-reinforced resin layer 32, and a surface coating layer 34 are laminated and integrally formed. The splitting prevention wire 35 is located at the boundary between the inner intermediate layer 52 and the outer intermediate layer 53. However, it is sufficient that the splitting prevention wire 35 is located at the boundary between the inner intermediate layer 52 and the outer intermediate layer 53, and the center of the splitting prevention wire 35 does not have to be located at the boundary between the inner intermediate layer 52 and the outer intermediate layer 53.

[0082] The inner intermediate layer 52 is formed by the same process as the intermediate layer 33 of the ball handle 10. That is, the inner intermediate layer 52 is made up of a single or multiple cross patterns, and the carbon fibers reinforcing the inner intermediate layer 52 are arranged in the circumferential direction (left and right direction in the figure), the axial direction 21 (direction perpendicular to the paper surface in the figure), or a direction intersecting the axial direction 21. In particular, when the inner intermediate layer 52 is made up of multiple cross patterns, the carbon fibers may be arranged to form a lattice.

[0083] The outer intermediate layer 53 is also formed by the same process as the intermediate layer 33 and is composed of a single or multiple cross patterns. The carbon fibers reinforcing the outer intermediate layer 53 are arranged along the circumferential direction, the axial direction 21, or a direction intersecting the axial direction 21. As with the inner intermediate layer 52, when the outer intermediate layer 53 is composed of a multiple cross pattern, the carbon fibers may be arranged to form a lattice.

[0084] The direction of the carbon fibers reinforcing the inner intermediate layer 52 and the outer intermediate layer 53 is appropriately selected depending on the strength design of the blanks 17 to 20.

[0085] For example, in the design of blanks 17 to 20, the carbon fibers in either or both of the inner intermediate layer 52 and the outer intermediate layer 53 are arranged to extend along the axial direction 21. This design improves the tensile strength of blanks 17 to 20 in the axial direction 21, and improves the bending strength of blanks 17 to 20 as structures.

[0086] Furthermore, when the carbon fibers in at least one of the inner intermediate layer 52 and the outer intermediate layer 53 are arranged so as to extend along the circumferential direction of the blanks 17 to 20, the carbon fibers are arranged in a lattice pattern, improving the tensile strength of the blanks 17 to 20 in the circumferential direction, thereby further improving the torsional strength of the blanks 17 to 20.

[0087] In designing the blanks 17 to 20, the carbon fibers of either or both of the inner intermediate layer 52 and the outer intermediate layer 53 may be arranged so that they extend in a direction intersecting the axial direction 21. In particular, it is preferable that the direction of the carbon fibers contained in the inner intermediate layer 52 intersects the direction of the carbon fibers contained in the outer intermediate layer 53. This design improves the buckling (crushing) strength of the blanks 17 to 20.

[0088] <Example of design change>

[0089] FIG. 11 is a diagram showing a schematic cross-sectional structure of blanks 17 to 20 according to design modifications of the above-described embodiments.

[0090] In the blanks 17 to 20 according to this design modification, the splitting prevention wire 35 extends spirally along the axial direction 21. By winding the splitting prevention wire 35 around the blanks 17 to 20 in this way, the mechanical strength of the blanks 17 to 20 as structures is further improved. [Explanation of symbols]

[0091] 10. Ball handle 11 Handle body 17. Blank 18...Blank 19...Blank 20...Blank 21 Axial direction 31...First fiber-reinforced resin layer 32...Second fiber reinforced resin layer 33. Middle class 35. Anti-break wire 50... Ball handle 51. Middle class 52...Inner middle layer 53...outer middle layer 54 Edge 55... Edge

Claims

1. A ball handle having a blank made of a plurality of resin layers, The blank is A first fiber reinforced resin layer provided radially inside and containing reinforcing fibers extending in the circumferential direction; A second fiber reinforced resin layer provided radially outside the first fiber reinforced resin layer and containing reinforcing fibers extending in the circumferential direction; an intermediate layer having one anti-severance wire extending along the axial direction, adjacent to the first fiber reinforced resin layer and the second fiber reinforced resin layer, and provided between the first fiber reinforced resin layer and the second fiber reinforced resin layer; The intermediate layer is an inner intermediate layer located radially inward of the anti-severance wire; an outer intermediate layer radially outward from the anti-severance wire; One of the inner intermediate layer and the outer intermediate layer contains reinforcing fibers extending in the axial direction, The other of the inner intermediate layer and the outer intermediate layer contains reinforcing fibers extending in the circumferential direction.

2. The ball handle according to claim 1 , wherein the anti-breakage wire is disposed between the edges of the inner intermediate layer and between the edges of the outer intermediate layer.

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