Fishing rod

Abstract

To provide a fishing rod having difficulty in bending by alternately laminating a glass fiber layer, a carbon fiber layer and a glass fiber layer, further suppressing peeling of carbon fibers and suppressing damage such as deformation and breakage.SOLUTION: The fishing rod according to the present invention is a fishing rod having a circular hollow cross-sectional structure, comprising at least a first glass fiber layer formed on the innermost side of the rod and formed over the entire length in the axial direction of the rod, a first carbon fiber layer formed on the outer side in the radial direction of the first glass fiber layer and formed over the entire length in the axial direction of the rod, and a second glass fiber layer formed on the outer side in the radial direction of the first carbon fiber layer and formed so as to cover at least a part of the first carbon fiber layer, further, the carbon fiber layer and the glass fiber layer are repeatedly laminated a plurality of times on the second glass fiber layer, and the entire laminated carbon fiber layer is covered with the laminated glass fiber layer.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to fishing rods, and more particularly to fishing rods having a circular hollow cross-section. [Background technology]

[0002] In terms of material, fishing rods are divided into glass rods (fishing rods made of glass fiber reinforced plastic) and carbon rods (fishing rods made of carbon fiber reinforced plastic), and in terms of shape, they are divided into rods with a circular hollow cross-section structure (tubular rods) and solid rods with a circular solid cross-section structure.

[0003] The glass rod and the carbon rod are selected depending on the target fish or the user's preference, but generally, carbon rods are more widely used than glass rods because they have stronger tension. In terms of weight, rods with a circular hollow cross section (tubular rods) are lighter than solid rods with a circular solid cross section, and are therefore more widely used.

[0004] Incidentally, a conventional rod with a circular hollow cross section structure (tubular rod) is formed into a cylindrical shape by winding and laminating prepregs formed by impregnating reinforcing fibers with synthetic resin around a core bar, as shown in Patent Document 1, for example. Furthermore, Patent Document 2 discloses a fishing rod (tubular rod) having a circular hollow cross section structure, which is made of carbon gradient fiber and glass fiber woven fabric. Specifically, this fishing rod is formed by winding a carbon gradient fiber S1 oriented in a first direction around a core, then winding a carbon gradient fiber S2 oriented in a second direction around the outer surface of the carbon gradient fiber S1, and then winding a glass fiber woven cloth around the outer surface of the carbon gradient fiber S2, and then removing the core.

[0005] In this way, a fishing rod (tubular rod) with a circular hollow cross section structure made from carbon gradient fiber and glass fiber woven fabric is lighter than a solid rod with a circular solid cross section structure, and because the carbon gradient fiber is layered, its bending strength is also improved. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-78295 [Patent Document 2] Japanese Patent Application Publication No. 11-75630 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in a fishing rod in which carbon fibers are laminated on the outer periphery of another carbon fiber, when a large load acts on the tip of the rod and the rod bends significantly, the carbon fibers may break and peel off. Furthermore, the fibers in the carbon fiber layer may break and peel off. In extreme cases, the fishing rod may be deformed, broken, or otherwise damaged. In particular, because a large load is applied from the middle to the rear end of the fishing rod, the fishing rod may be deformed, broken, or otherwise damaged from the middle to the rear end. There is also a social demand for fishing rods that have adequate tension (resistance to bending).

[0008] The inventors decided to use a rod with a circular hollow cross section structure (tubular rod) as a fishing rod because rods with a circular hollow cross section structure (tubular rod) are lighter and more widely used than solid rods with a circular dense cross section structure. The inventors then conducted extensive research into improving bending strength by laminating carbon layers and suppressing peeling of the laminated carbon fiber layers. To prevent the laminated carbon fiber layers from peeling off, a glass fiber layer is first formed on the innermost periphery, a carbon fiber layer is then formed on the glass fiber layer, and a glass fiber layer is then formed on the carbon fiber layer, so that the glass fiber layers and the carbon fiber layers are laminated alternately. Then, a glass fiber layer is formed on the outermost periphery. It was found that by sandwiching (covering) the carbon fiber layer with glass fiber layers in this way, peeling of the carbon fiber layer is suppressed, and the present invention was completed based on this finding. Furthermore, the inventors discovered that by laminating a carbon fiber layer and a glass fiber layer on top of a glass fiber layer, the presence of the carbon fiber layer can improve bending strength, resulting in a fishing rod that is moderately difficult to bend, and thus completed the present invention.

[0009] The present invention was made under these circumstances, and aims to provide a fishing rod that is moderately hard to bend by alternately laminating glass fiber layers, carbon fiber layers, and glass fiber layers, and further suppresses peeling of the carbon fibers and damage such as deformation and breakage. [Means for solving the problem]

[0010] The fishing rod of the present invention, which has been made to solve the above problems, is a fishing rod with a circular hollow cross section structure, and is equipped with at least: a first glass fiber layer formed on the innermost side of the rod and formed over the entire length of the rod in the axial direction; a first carbon fiber layer formed on the outer peripheral surface of the first glass fiber layer and formed over the entire length of the rod in the axial direction; and a second glass fiber layer formed on the outer peripheral surface of the first carbon fiber layer and formed so as to cover at least the first carbon fiber layer from the middle to the rear end of the rod; and further characterized in that a carbon fiber layer and a glass fiber layer are laminated at least once on the outer peripheral surface of the second glass fiber layer, and the laminated carbon fiber layer is covered with the laminated glass fiber layer.

[0011] In this way, in the fishing rod according to the present invention, glass fiber layers, carbon fiber layers, and glass fiber layers are alternately laminated, with the carbon fiber layers interposed, so that the rod has a moderate degree of resistance to bending.

[0012] Moreover, the first carbon fiber layer is sandwiched between the first glass fiber layer and the second glass fiber layer, and the carbon fiber layer laminated on the second glass fiber layer is sandwiched between the second glass fiber layer and the glass fiber layer, and the laminated carbon fiber layer is further sandwiched between the glass fiber layers. In this way, since the carbon fiber layer is sandwiched between the glass fiber layers, peeling of the carbon fiber can be further suppressed, and damage such as deformation and breakage of the fishing rod can be further suppressed.

[0013] The second glass fiber layer is formed to cover at least the middle to rear end of the first carbon fiber layer because there is less risk of the first carbon fiber layer peeling off in areas where external forces (bending moment forces) do not act strongly. Therefore, if necessary, the second glass fiber layer may be formed so as to cover the entire first carbon fiber layer from the tip end to the butt end of the rod.

[0014] Here, it is desirable that carbon tape is wound on the outer peripheral surface of the first glass fiber layer, the carbon tape is wound in one direction at an angle of 35 to 45 degrees relative to the axis of the rod, and is wound in the opposite direction to the winding direction at an angle of 35 to 45 degrees relative to the axis of the rod, and further a first carbon fiber layer is formed on the outer peripheral surface of the carbon tape. When the carbon tape is wound in this manner, the carbon tape resists the torsion acting on the fishing rod (the force that rotates around the axis of the fishing rod), making the fishing rod resistant to torsion.

[0015] Furthermore, it is desirable that the first glass fiber layer and the first carbon fiber layer have a first length dimension, the length of the second glass fiber layer formed on the first carbon fiber layer has a second length dimension that is equal to or less than the first length dimension, the lengths of the carbon fiber layer and the glass fiber layer stacked on the second glass fiber layer have a third length dimension that is equal to or less than the second length dimension, and the third length dimension becomes shorter each time a carbon fiber layer and a glass fiber layer are stacked, so that the length dimension of the stacked carbon fiber layer and the glass fiber layer from the rear end of the rod becomes shorter.

[0016] In this way, each time a carbon fiber layer and a glass fiber layer are stacked, the third length dimension becomes shorter, and the length dimension of the stacked carbon fiber layer and glass fiber layer becomes shorter from the rear end of the rod. That is, as the carbon fiber layer and the glass fiber layer are stacked toward the rear end of the rod, the carbon fiber layer and the glass fiber layer are formed thicker. That is, in the area (the rear end of the rod) where a large external force (bending moment force) acts, carbon fiber layers and glass fiber layers are laminated, and the carbon fiber layers and glass fiber layers become thicker.

[0017] Therefore, when a load acts on the tip of the fishing rod, the rear end of the fishing rod, where a large bending moment force acts, has a large bending strength due to the thick carbon fiber layer and glass fiber layer, and even if a large external force (load) acts, peeling of the carbon fiber can be more effectively prevented, and damage such as deformation and breakage of the fishing rod can be more effectively prevented.

[0018] It is also desirable that a carbon tape is formed on the outer peripheral surface of the outermost glass fiber layer, and that the carbon tape is wound in one direction at an angle of 35 to 45 degrees relative to the axis of the rod, and also wound in the opposite direction to the winding direction at an angle of 35 to 45 degrees relative to the axis of the rod. When the carbon tape is wound in this manner, the carbon tape resists the torsion acting on the fishing rod (the force that rotates around the axis of the fishing rod), making the fishing rod resistant to torsion. [Effects of the Invention]

[0019] According to the present invention, by alternately laminating glass fiber layers, carbon fiber layers, and glass fiber layers, it is possible to obtain a fishing rod that has a moderate resistance to bending, and further, prevents the carbon fibers from peeling off, and prevents damage such as deformation and breakage. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a diagram showing a fishing rod according to one embodiment of the present invention. [Figure 2] 2 is a cross-sectional view shown in FIG. 1, in which (a) is a cross-sectional view taken along line II of the tip of the fishing rod, (b) is a cross-sectional view taken along line II-II of the tip side of the middle part of the fishing rod, (c) is a cross-sectional view taken along line III-III of the rear end side of the middle part of the fishing rod, (d) is a cross-sectional view taken along line IV-IV of the front of the rear end part of the fishing rod, (e) is a cross-sectional view taken along line VV of the tip side of the rear end part of the fishing rod, (f) is a cross-sectional view taken along line VI-VI of the rear end side of the rear end part of the fishing rod, and (g) is a cross-sectional view taken along line VII-VII of the rear part of the rear end part of the fishing rod. [Figure 3] FIG. 3 is a diagram showing the state in which the carbon tape is wound. [Figure 4] FIG. 4 is a diagram for explaining the torsion acting on a fishing rod. [Figure 5] FIG. 5 is a diagram showing a method for manufacturing a fishing rod according to the present invention. [Figure 6] FIG. 6 is a diagram showing the bent state of Comparative Example 1. [Figure 7] FIG. 7 is a diagram showing the bent state of the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] An embodiment of a fishing rod according to the present invention will be described with reference to Figures 1 to 5. Note that the drawings are schematic illustrations for ease of understanding, and do not represent the actual shape or dimensions.

[0022] As shown in Figures 1 and 2, a fishing rod 1 according to an embodiment of the present invention is a rod (tubular rod) with a circular hollow cross-section structure in which a space 1A with a circular cross-section is formed along the axis of the rod. This circular hollow cross-section rod (tubular rod) has the advantage of being lighter and easier to use than a solid circular cross-section rod.

[0023] 2(a) to 2(g) are diagrams showing cross sections II to VII-VII shown in FIG. 1. As shown in the figures, a first glass fiber layer 3 is formed on the innermost periphery of the fishing rod 1 according to the embodiment of the present invention, from the tip to the butt end of the rod 1. This first glass fiber layer 3 is formed along the axis of the rod 1. In other words, the first glass fiber layer 3 is formed as a cylindrical body, and is a basic structural part of the rod 1. The first glass fiber layer 3 is made of glass fiber prepreg. This glass fiber prepreg is a composite material made by impregnating a sheet of glass fiber with resin, and is a raw material for molding fiber-reinforced plastics, and any known prepreg can be used.

[0024] When the glass fiber prepreg is glass fiber impregnated with a thermoplastic resin, it softens when heated and hardens when cooled to form the first glass fiber layer 3. When the glass fiber prepreg is glass fiber impregnated with a thermosetting resin, it hardens when heated to form the first glass fiber layer 3. In the fishing rod according to the present invention, any type of glass fiber prepreg can be used.

[0025] Furthermore, as shown in Figure 3, a carbon tape 4 (4A) is wound in one direction on the outer peripheral surface of the first glass fiber layer 3 from the tip to the rear end of the rod 1 at an angle θ1 of 35 to 45 degrees with respect to the axis of the first glass fiber layer 3 (rod 1). In addition, in the opposite direction to the winding direction, carbon tape 4 (4B) is wound from the tip to the rear end of rod 1 at an angle θ2 of 35 to 45 degrees with respect to the axis of first glass fiber layer 3 (rod 1). The carbon tape is, for example, a tape made by cutting a unidirectional carbon fiber prepreg to a predetermined width, and the carbon tape manufactured by Toray Industries, Inc. can be used.

[0026] In this way, the carbon tape 4 is wound in both forward and reverse directions from the tip to the butt end of the rod 1 at an angle of 35 to 45 degrees relative to the axis of the first glass fiber layer 3 (rod 1). As a result, as shown in Figure 4, when a twist in both forward and reverse directions acts on the fishing rod 1 (a force that rotates in the X and Y directions with the axis of the rod at O), the carbon tape 4 resists the force, making the fishing rod resistant to twisting.

[0027] Here, if the carbon tape 4 is at an angle of less than 35 degrees with respect to the axis of the first glass fiber layer 3 (rod 1), the number of turns of the carbon tape 4 will increase, making the fishing rod heavy, which is not preferable. On the other hand, if the angle is more than 45 degrees with respect to the axis of the first glass fiber layer 3 (rod 1), the force that resists the rotational forces in the X and Y directions around the axis 1a of the fishing rod 1 will be weak, making the fishing rod weak against twisting, which is not preferable.

[0028] 2(a) to 2(g), a first carbon fiber layer 5 is formed on the outer peripheral surface of the carbon tape 4 from the tip to the butt end of the fishing rod 1. This first carbon fiber layer 5 is made of carbon fiber prepreg. That is, the first glass fiber layer 3, the carbon tape 4, and the first carbon fiber layer 5 are formed from the tip to the butt end of the fishing rod 1, and are the basic structural parts of the rod 1. The carbon fiber prepreg is a composite material made by impregnating a sheet of carbon fiber with resin, and is a raw material for forming fiber reinforced plastics, and any known material can be used.

[0029] For example, when the carbon fiber prepreg is carbon fiber impregnated with a thermoplastic resin, it softens when heated and hardens when cooled, forming the first carbon fiber layer 5. When the carbon fiber prepreg is carbon fiber impregnated with a thermosetting resin, it hardens when heated, forming the first carbon fiber layer 5.

[0030] 1 and 2(b), a second glass fiber layer 6 is formed on the outer circumferential surface of the first carbon fiber layer 5 from the tip end of the middle section L2 of the fishing rod 1 to the rear end of the rear section L3. This second glass fiber layer 6 is formed along the axis of the first glass fiber layer 3 (rod 1). In other words, this second glass fiber layer 6 is formed so as to cover the first carbon fiber layer 5. This second glass fiber layer 6 is formed from the same glass fiber prepreg as the first glass fiber layer 3 .

[0031] Since the first carbon fiber layer 5 is sandwiched between the first glass fiber layer 3 and the second glass fiber layer 6, peeling of the carbon fibers can be further suppressed, and damage such as deformation and breakage of the fishing rod can be further suppressed. The second glass fiber layer 6 is formed to cover the first carbon fiber layer 5 from the tip end of the middle portion L2 to the rear end of the rear portion L3 because there is little risk of the first carbon fiber layer 5 peeling off in the area where external forces (bending moment forces) do not act strongly (from the tip end to the tip end of the middle portion L2), and therefore it is not necessary to provide the second glass fiber layer 6 to cover the entire first carbon fiber layer 5.

[0032] Also, as shown in FIG. 2(c), a second carbon fiber layer 7 is formed on the outer peripheral surface of the second glass fiber layer 6 from the rear end portion of the middle portion L2 of the fishing rod 1 to the rear end of the rear half portion L3. The second carbon fiber layer 7 is formed along the axis of the first glass fiber layer 3 (rod 1). The second carbon fiber layer 7 is made of the same carbon fiber prepreg as the first carbon fiber layer 5.

[0033] Furthermore, as shown in FIG. 2(c), a third glass fiber layer 8 is formed on the outer peripheral surface of the second carbon fiber layer 7 from the rear end portion of the middle portion L2 of the fishing rod 1 to the rear end of the rear half portion L3. The third glass fiber layer 8 has the same length as the second carbon fiber layer 7, and is formed so as to cover the entire second carbon fiber layer 7.

[0034] The third glass fiber layer 8 is formed from the same glass fiber prepreg as the first glass fiber layer 3 described above. In this way, the second carbon fiber layer 7 is sandwiched between the second glass fiber layer 6 and the third glass fiber layer 8, which further prevents the carbon fibers from peeling off and further prevents damage such as deformation and breakage of the fishing rod.

[0035] As shown in FIG. 2(d), a third carbon fiber layer 9 is formed on the outer peripheral surface of the glass fiber layer 8 from the front portion of the rear half L3 of the fishing rod 1 to the rear end of the rear half L3. The third carbon fiber layer 9 is formed along the axis of the first glass fiber layer 3 (rod 1) and is shorter in length than the second carbon fiber layer 7 and the third glass fiber layer 8. The third carbon fiber layer 9 is formed from the same carbon fiber prepreg as the first carbon fiber layer 5.

[0036] Furthermore, as shown in FIG. 2(d), a fourth glass fiber layer 10 is formed on the outer peripheral surface of the third carbon fiber layer 9 from the front portion of the rear half L3 of the fishing rod 1 to the rear end of the rear half L3. The fourth glass fiber layer 10 has the same length as the third carbon fiber layer 9, and is formed so as to cover the entire third carbon fiber layer 9.

[0037] The fourth glass fiber layer 10 is formed from a glass fiber prepreg similar to the third glass fiber layer 3 described above. In this way, the third carbon fiber layer 9 is sandwiched between the third glass fiber layer 8 and the fourth glass fiber layer 10, which further prevents the carbon fibers from peeling off and further prevents damage such as deformation and breakage of the fishing rod.

[0038] As shown in FIG. 2(e), a fourth carbon fiber layer 11 is formed on the outer peripheral surface of the fourth glass fiber layer 10 from the tip end to the butt end of the rear half L3 of the fishing rod 1. 1, this carbon fiber layer 11 is formed along the axis of the first glass fiber layer 3 (rod 1) and is shorter in length than the third carbon fiber layer 9 and the fourth glass fiber layer 10. The carbon fiber layer 11 is formed from the same carbon fiber prepreg as the first carbon fiber layer 5.

[0039] Furthermore, as shown in FIG. 2(e), a fifth glass fiber layer 12 is formed on the outer peripheral surface of the fourth carbon fiber layer 11 from the tip end side to the butt end of the rear half L3 of the fishing rod 1. The fifth glass fiber layer 12 has the same length as the fourth carbon fiber layer 11 , and is formed so that the fifth glass fiber layer 12 covers the fourth carbon fiber layer 11 . The fifth glass fiber layer 12 is formed from a glass fiber prepreg similar to the first glass fiber layer 3 described above. In this way, since the fourth carbon fiber layer 11 is sandwiched between the fourth glass fiber layer 10 and the fifth glass fiber layer 12, peeling of the carbon fibers can be further suppressed, and damage such as deformation and breakage of the fishing rod can be further suppressed.

[0040] As shown in FIG. 2(f), a fifth carbon fiber layer 13 is formed on the outer peripheral surface of the fifth glass fiber layer 12 from the rear end side to the rear end of the rear half L3 of the fishing rod 1. The fifth carbon fiber layer 13 is formed along the axis of the first glass fiber layer 3 (rod 1) and is shorter in length than the fourth carbon fiber layer 11 and the fifth glass fiber layer 12. The fifth carbon fiber layer 13 is formed from the same carbon fiber prepreg as the first carbon fiber layer 5.

[0041] Furthermore, as shown in FIG. 2(f), a sixth glass fiber layer 14 is formed on the outer peripheral surface of the fifth carbon fiber layer 13 from the rear end side to the rear end of the rear half L3 of the fishing rod 1. The sixth glass fiber layer 14 has the same length as the fifth carbon fiber layer 13 , and is formed so that the sixth glass fiber layer 14 covers the fifth carbon fiber layer 13 . The sixth glass fiber layer 14 is formed from a glass fiber prepreg similar to the first glass fiber layer 3 described above. In this way, the fifth carbon fiber layer 13 is sandwiched between the fifth glass fiber layer 12 and the sixth glass fiber layer 14, which further prevents the carbon fibers from peeling off and further prevents damage such as deformation and breakage of the fishing rod.

[0042] As shown in FIG. 2(g), a sixth carbon fiber layer 15 is formed on the outer peripheral surface of the sixth glass fiber layer 14 from the rear portion to the rear end of the rear half L3 of the fishing rod 1. The sixth carbon fiber layer 15 is formed along the axis of the first glass fiber layer 3 (rod 1) and is shorter in length than the fifth carbon fiber layer 13 and the sixth glass fiber layer 14. The sixth carbon fiber layer 15 is formed from the same carbon fiber prepreg as the first carbon fiber layer 5.

[0043] Furthermore, as shown in FIG. 2(g), a seventh glass fiber layer 16 is formed on the outer peripheral surface of the sixth carbon fiber layer 15 from the rear portion to the rear end of the rear half L3 of the fishing rod 1. The seventh glass fiber layer 16 has the same length as the sixth carbon fiber layer 15 , and is formed so that the seventh glass fiber layer 16 covers the sixth carbon fiber layer 15 . The glass fiber layer 16 is formed from a glass fiber prepreg similar to the third glass fiber layer 3 described above. In this way, since the sixth carbon fiber layer 15 is sandwiched between the sixth glass fiber layer 14 and the seventh glass fiber layer 16, peeling of the carbon fibers can be further suppressed, and damage such as deformation and breakage of the fishing rod can be further suppressed.

[0044] Since each of the carbon fiber layers 5, 7, 9, 11, 13, and 15 stacked in this manner is sandwiched between the glass fiber layers 3, 6, 8, 10, 12, 14, and 16, peeling of the carbon fibers can be further suppressed, and damage such as deformation and breakage of the fishing rod can be further suppressed.

[0045] The carbon fiber layers and glass fiber layers described above are formed by winding a carbon fiber prepreg and a glass fiber prepreg around a core metal and then applying heat, as will be described later. Furthermore, by applying heat, the carbon fiber layer and the glass fiber layer are brought into close contact with each other, and the carbon fiber layer and the glass fiber layer are integrated into one body.

[0046] In this embodiment, the carbon fiber layers are stacked six times and the glass fiber layers are stacked seven times, but the present invention is not limited to this. That is, as the number of laminations of the carbon fiber layers and glass fiber layers increases, the mechanical strength increases, but the fishing rod becomes thicker and heavier, so it is best to determine the number of laminations as needed, taking into account the purpose of use of the fishing rod, etc.

[0047] 2 and 3, a carbon tape 2 (2A) is wound in one direction at an angle θ1 of 35 to 45 degrees with respect to the axis of the fishing rod 1 around the tip of the carbon fiber layer 5 and the outer peripheral surface of the glass fiber layers 6, 8, 10, 12, 14, and 16 (the outermost glass fiber layer of the fishing rod). This carbon tape 2 is the same carbon tape as the carbon tape wound around the outer peripheral surface of the first glass fiber layer 3. Further, the carbon tape 2 (2B) is wound in the opposite direction to the winding direction at an angle θ2 of 35 to 45 degrees with respect to the axis of the fishing rod 1. The carbon tape is, for example, a tape made by cutting a unidirectional carbon fiber prepreg to a predetermined width, and the carbon tape manufactured by Toray Industries, Inc. can be used.

[0048] In this way, the carbon tape 2 is wound in both forward and reverse directions at an angle of 35 to 45 degrees relative to the axis of the fishing rod 1. Therefore, as shown in FIG. 4, when a twist in the forward and reverse directions (a force that rotates in the X and Y directions around the axis of the fishing rod as the center O) acts on the fishing rod 1, the carbon tape 2 resists the force, making the fishing rod resistant to twisting. Moreover, since the carbon tape 2 (2B) is also wound around the outer peripheral surface of the first glass fiber layer 3, the fishing rod can be made more resistant to twisting.

[0049] Here, if the carbon tape 2 is at an angle of less than 35 degrees with respect to the axis of the fishing rod 1, the number of turns of the carbon tape 2 will increase, which is not preferable as it will make the fishing rod heavy. On the other hand, if the angle is more than 45 degrees with respect to the axis of the fishing rod 1, the force that resists the rotational forces in the X and Y directions about the center O of the fishing rod 1 will be weak, making the fishing rod weak against twisting, which is not preferable.

[0050] In the fishing rod of the present invention having the above-described configuration, the second glass fiber layer 6 is formed on the outer peripheral surface of the first carbon fiber layer 5, which further suppresses peeling of the carbon fibers of the first carbon fiber layer 5 and further suppresses damage such as deformation and breakage of the fishing rod. In particular, the number of carbon fiber layers and glass fiber layers stacked increases toward the rear end of the fishing rod where force acts at the tip and large bending moment forces are applied, which increases the mechanical strength from the middle to the rear end of the fishing rod and further reduces damage such as deformation and breakage. Furthermore, since the carbon fiber layers are laminated so as to be sandwiched between the glass fiber layers, peeling of the carbon fibers can be further suppressed, and damage such as deformation and breakage of the fishing rod can be further suppressed.

[0051] In the above embodiment, the number of laminations of carbon fiber layers and glass fiber layers increases toward the rear end of the fishing rod. However, the carbon fiber layers and glass fiber layers may be formed with the same number of laminations throughout the entire fishing rod.

[0052] Next, a method for manufacturing a fishing rod according to the present invention will be described with reference to Fig. 5. In Fig. 5, S1 to S18 indicate the order of steps. First, a core A is prepared (S1) as shown in Fig. 5. This core A is a rod-shaped body made of metal, and forms a space having a circular cross section in the center of the fishing rod 1.

[0053] Next, a glass fiber prepreg 20 is wound around the core A (S2). The glass fiber prepreg 20 forms the first glass fiber layer 3. The glass fiber prepreg is a sheet-like material made by impregnating reinforcing glass fibers cut into a predetermined shape with a synthetic resin, and known glass fiber prepregs can be used.

[0054] First, in the glass fiber prepreg 20 wound around the core A, a tip portion 20b of the rectangular prepreg is cut obliquely to form a tapered portion 20a. As a result, when the glass fiber prepreg 20 is wound around the core A from one side 20c to the other side 20d, the wound layer of the glass fiber prepreg 20 at the tip side of the core A is thin due to the portion where the tapered portion 20a is formed (the portion with a narrow width), and the wound layer gradually becomes thicker. The wound layer of the glass fiber prepreg 20 in the region of the middle portion L2 and the region of the rear end portion L3 of the core bar A shown in FIG. 1 is formed to a constant thickness.

[0055] The distance from the tip 20b to the specific point 20e, which is the intersection of the tapered portion 20a and the side 20d, affects the rigidity of the rod. That is, when the distance from the tip end 20b to the specific point 20e becomes longer, the laminated portion of the glass fiber prepreg (described later) wound after the glass fiber prepreg 20 becomes shorter, and the rigidity of the rod becomes weaker. On the other hand, when the distance from the tip end 20b to the specific point 20e becomes shorter, the laminated portion of the glass fiber prepreg (described later) wound after the glass fiber prepreg 20 becomes longer, and the rigidity of the rod becomes stronger. Therefore, it is necessary to determine the position of the specific point 20e taking into consideration the rigidity of the fishing rod.

[0056] Next, the carbon tape 4 is wound around the outer peripheral surface of the wound glass fiber prepreg 20 (glass fiber layer 3) in one direction at an angle of 35 to 45 degrees relative to the axis of the core A. In addition, the carbon tape 4 is wound in the opposite direction to the winding direction at an angle of 35 to 45 degrees relative to the axis of the core A (S3).

[0057] Next, carbon fiber prepreg 21 to be wound around carbon tape 4 is prepared (S4). This carbon fiber prepreg 21 forms first carbon fiber layer 5. The length of this carbon fiber prepreg 21 is the same as the length dimension of the first glass fiber prepreg 20 .

[0058] In this carbon fiber prepreg 21, similarly to the first glass fiber prepreg 20, a tip portion 21b of a rectangular prepreg is cut obliquely to form a tapered portion 21a. The distance from tip portion 21b to specific point 21e, which is the intersection of tapered portion 21a and side edge 21d, affects the rigidity of the fishing rod in the same way as specific point 20e, so the position of specific point 21e needs to be determined taking into account the rigidity of the fishing rod.

[0059] That is, when the distance from tip end 21b to specific point 21e becomes longer, the portion where the carbon fiber prepreg (described later) that is wound after carbon fiber prepreg 21 becomes shorter, and the rigidity of the rod becomes weaker. On the other hand, when the distance from tip end 21b to specific point 21e becomes shorter, the portion where the carbon fiber prepreg (described later) that is wound after carbon fiber prepreg 21 becomes longer, and the rigidity of the rod becomes stronger. Therefore, it is necessary to determine the position of the specific point 21e taking into consideration the rigidity of the fishing rod.

[0060] When the carbon fiber prepreg 21 is wound from one side 21c to the other side 21d, the wound layer of the carbon fiber prepreg 21 at the tip side of the core A is thin due to the portion where the tapered portion 21a is formed (the portion with a narrow width), and the wound layer gradually becomes thicker. The wound layer of carbon fiber prepreg 21 in the area of ​​the middle portion L2 and the area of ​​the rear end portion L3 of the fishing rod shown in FIG. 1 is formed to a constant thickness.

[0061] Next, a glass fiber prepreg 22 to be wound around the carbon fiber prepreg 21 is prepared (S5). This carbon fiber prepreg 22 forms the second glass fiber layer 6. The length of the glass fiber prepreg 22 is shorter than the length of the carbon fiber prepreg 21, and has a length such that the tip end 22b of the glass fiber prepreg 22 is located within the tapered portion 21a of the carbon fiber prepreg 21.

[0062] The glass fiber prepreg 22 has a tapered portion 22a formed by cutting the tip of a rectangular prepreg obliquely. Then, the tip 22b of the glass fiber prepreg 22 is positioned within the tapered portion 21a of the carbon fiber prepreg 21, and the glass fiber prepreg 22 is wound from one side 22c to the other side 22d, whereby the second glass fiber prepreg 22 (glass fiber layer 6) is formed on the outer peripheral surface of the carbon fiber prepreg 21 (first carbon fiber layer 5).

[0063] Next, a carbon fiber prepreg 23 to be wound around the glass fiber prepreg 22 (glass fiber layer 6) and a glass fiber prepreg 24 to be wound around the carbon fiber prepreg 23 are prepared (S6, S7). The carbon fiber prepreg 23 forms the second carbon fiber layer 7 , and the glass fiber prepreg 24 forms the third glass fiber layer 8 . The carbon fiber prepreg 23 and the glass fiber prepreg 24 are formed to the same length, and the tapered portions 23a, 24a are also formed to be identical. The lengths of the carbon fiber prepreg 23 and the glass fiber prepreg 24 (the dimensions from the front ends 23b, 24b to the rear ends 23f, 24f) correspond to the dimension from the rear end 22f of the glass fiber prepreg 22 to the specific point 22e.

[0064] Then, the tip 23b of the carbon fiber prepreg 23 is positioned at a specific point 22e of the glass fiber prepreg 22, and the carbon fiber prepreg 23 is wound from one side edge 23c to the other side edge 23d, and the carbon fiber prepreg 23 is wound on the glass fiber prepreg 22 (second glass fiber layer 6). Furthermore, the tip 24b of the glass fiber prepreg 24 is positioned at a specific point 22e of the glass fiber prepreg 22, and the glass fiber prepreg 24 is wound from one side 24c to the other side 24d, and the glass fiber prepreg 24 is wound on the wound carbon fiber prepreg 23.

[0065] Next, a carbon fiber prepreg 25 to be wound around the glass fiber prepreg 24 (glass fiber layer 8) and a glass fiber prepreg 26 to be wound around the carbon fiber prepreg 25 are prepared (S8, S9). The carbon fiber prepreg 25 forms the third carbon fiber layer 9, and the glass fiber prepreg 26 forms the fourth glass fiber layer 10.

[0066] The carbon fiber prepreg 25 and the glass fiber prepreg 26 are formed to have the same length, and the tapered portions 25a, 26a are also formed to be identical. The lengths of the carbon fiber prepreg 25 and the glass fiber prepreg 26 (the dimensions from the front ends 25b, 26b to the rear ends 25f, 26f) correspond to the dimension from the rear end 24f of the glass fiber prepreg 24 to the specific point 24e.

[0067] Then, the tip 25b of the carbon fiber prepreg 25 is positioned at a specific point 24e of the glass fiber prepreg 24, and the carbon fiber prepreg 25 is wound from one side 25c to the other side 25d, and the carbon fiber prepreg 25 is wound on the glass fiber prepreg 24 (third glass fiber layer 8). Furthermore, the tip 26b of the glass fiber prepreg 26 is positioned at a specific point 24e of the glass fiber prepreg 24, and the glass fiber prepreg 26 is wound from one side 26c to the other side 26d, and the glass fiber prepreg 26 is wound on the wound carbon fiber prepreg 25.

[0068] Next, a carbon fiber prepreg 27 to be wound around the glass fiber prepreg 26 (fourth glass fiber layer 10) and a glass fiber prepreg 28 to be wound around the carbon fiber prepreg 27 are prepared (S10, S11). The carbon fiber prepreg 27 forms the fourth carbon fiber layer 11 , and the glass fiber prepreg 28 forms the fifth glass fiber layer 12 . The carbon fiber prepreg 27 and the glass fiber prepreg 28 are formed to have the same length, and the tapered portions 27a, 28a are also formed to be identical. The lengths of the carbon fiber prepreg 27 and the glass fiber prepreg 28 (the dimensions from the front ends 27b, 28b to the rear ends 27f, 28f) correspond to the dimension from the rear end 26f of the glass fiber prepreg 26 to the specific point 26e.

[0069] Then, the tip 27b of the carbon fiber prepreg 27 is positioned at a specific point 26e of the glass fiber prepreg 26, and the carbon fiber prepreg 27 is wound from one side edge 27c to the other side edge 27d, and the carbon fiber prepreg 26 is wound on the glass fiber prepreg 26 (fourth glass fiber layer 10). Furthermore, the tip 28b of the glass fiber prepreg 28 is positioned at a specific point 26e of the glass fiber prepreg 26, and the glass fiber prepreg 28 is wound from one side 28c to the other side 28d, and the glass fiber prepreg 28 is wound on the wound carbon fiber prepreg 27.

[0070] Next, a carbon fiber prepreg 29 to be wound around the glass fiber prepreg 28 (fifth glass fiber layer 12) and a glass fiber prepreg 30 to be wound around the carbon fiber prepreg 29 are prepared (S12, S13). The carbon fiber prepreg 29 forms the fifth carbon fiber layer 13, and the glass fiber prepreg 30 forms the sixth glass fiber layer 14. The carbon fiber prepreg 29 and the glass fiber prepreg 30 are formed to the same length, and the tapered portions are also formed to be the same. The lengths of the carbon fiber prepreg 29 and the glass fiber prepreg 30 (the dimensions from the front ends 29b, 30b to the rear ends 29f, 30f) correspond to the dimension from the rear end 28f of the glass fiber prepreg 28 to a specific point 28e.

[0071] Then, the tip 29b of the carbon fiber prepreg 29 is positioned at a specific point 28e of the glass fiber prepreg 28, and the carbon fiber prepreg 29 is wound from one side 29c to the other side 29d, and the carbon fiber prepreg 29 is wound on the glass fiber prepreg 28 (the fifth glass fiber layer 12). Furthermore, the tip end 30b of the glass fiber prepreg 30 is positioned at a specific point 28e of the glass fiber prepreg 28, and the glass fiber prepreg 30 is wound from one side 30c to the other side 30d, and the glass fiber prepreg 30 is wound on the wound carbon fiber prepreg 29.

[0072] Next, a carbon fiber prepreg 31 to be wound around the glass fiber prepreg 30 (sixth glass fiber layer 14) and a glass fiber prepreg 32 to be wound around the carbon fiber prepreg 31 are prepared (S14, S15). The carbon fiber prepreg 31 forms the sixth carbon fiber layer 15 , and the glass fiber prepreg 31 forms the seventh glass fiber layer 16 . The carbon fiber prepreg 31 and the glass fiber prepreg 32 are formed to the same length, and the tapered portions are also formed to be the same. The length of the carbon fiber prepreg 31 and the glass fiber prepreg 32 (the dimension from the front ends 31b, 32b to the rear ends 31f, 32f) corresponds to the dimension from the rear end 30f of the glass fiber prepreg 30 to a specific point 30e.

[0073] Then, the tip 31b of the carbon fiber prepreg 31 is positioned at a specific point 30e of the glass fiber prepreg 30, and the carbon fiber prepreg 31 is wound from one side edge 31c to the other side edge 31d, and the carbon fiber prepreg 31 is wound on top of the glass fiber prepreg 30 (sixth glass fiber layer 14). Furthermore, the tip end 32b of the glass fiber prepreg 32 is positioned at a specific point 30e of the glass fiber prepreg 30, and the glass fiber prepreg 32 is wound from one side 32c to the other side 32d, and the glass fiber prepreg 32 is wound on the wound carbon fiber prepreg 31.

[0074] As described above, the glass fiber prepreg and the carbon fiber prepreg are wound alternately, with the glass fiber prepreg being formed so as to cover the carbon fiber prepreg. That is, the glass fiber layers are formed so as to sandwich the carbon fiber layers. The fishing rod 1 is formed so that the number of layers of carbon fiber prepreg and glass fiber prepreg increases from the tip to the butt end of the fishing rod 1. In other words, the fishing rod 1 is configured so that the number of carbon fiber layers and glass fiber layers increases from the tip to the butt end of the fishing rod 1, increasing the mechanical strength.

[0075] Next, carbon tape 2 is wound around the entire wound outer circumferential surface in one direction at an angle of 35 to 45 degrees with respect to the axis of core A (fishing rod 1). Further, the carbon tape 2 is wound in the opposite direction to the winding direction at an angle of 35 to 45 degrees with respect to the axis of the carbon solid core material 1a (S16).

[0076] Then, the core metal 1 is removed and the wire is cut to a predetermined length (S17). Thereafter, the laminate of cut carbon fiber prepreg and glass fiber prepreg is subjected to a heat treatment (S18). This heat treatment differs depending on the synthetic resin that constitutes the prepreg, but typically the heating temperature is 120°C to 130°C, and the treatment time is about 2 to 3 hours.

[0077] In the case of heat-curing prepregs, the synthetic resin impregnated in the carbon fiber prepreg and glass fiber prepreg softens in the early stage of the heating step, and air trapped during winding and gas generated by heating are released to the outside. At this time, the carbon fiber prepreg, glass fiber prepreg, and carbon tape are integrated, and the carbon fiber layer, glass fiber layer, and carbon tape are integrated. When the heating in the heat treatment step is continued, the synthetic resin impregnated in the prepreg hardens, the shape is fixed, and the rod is completed. [Example]

[0078] Example 1 As shown in Figure 5, first, a test rod was fabricated using glass fiber prepreg manufactured by Toray, carbon tape manufactured by Toray, and carbon prepreg manufactured by Toray, following the process shown in Figure 5. In this case, a prepreg in which fibers were incorporated in the 0° and 90° directions was used as the glass fiber prepreg, and a prepreg in which fibers were incorporated in the 0° and 90° directions was used as the carbon fiber prepreg.

[0079] The glass fiber prepreg was laminated so that the warp threads of the glass fibers were oriented in the axial direction of the core and the weft threads were oriented in the circumferential direction of the core. Similarly, the carbon fiber prepreg was laminated so that the warp threads of the carbon fibers were oriented in the axial direction of the core and the weft threads were oriented in the circumferential direction of the core. The carbon tape wound around the glass fiber prepreg constituting the first glass fiber layer and the carbon tape wound around the outermost periphery were wound so that θ1 was 45 degrees and θ2 was 45 degrees, as shown in Figure 3.

[0080] The laminated body consisting of the carbon fiber prepreg, the glass fiber prepreg, and the carbon tape was then subjected to a heat treatment at a heating temperature of 130°C for two hours to produce a test rod. After the heat treatment, the test rod of Example 1 had a length of 1500 mm, a diameter of 2 mm at the tip, and a diameter of 10 mm at the rear end.The test rod had a circular hollow cross section, with a space of 1 mm in diameter inside the tip and a space of 5 mm in diameter inside the rear end.

[0081] Furthermore, as Comparative Example 1, a test rod was produced by laminating only carbon fiber prepregs without using any glass fiber prepregs, with the same number of prepreg layers as in Example 1. That is, the glass fiber prepregs in Fig. 5 were used as carbon fiber prepregs, and carbon fiber prepregs were laminated according to the process shown in Fig. 5. The carbon tape wound around the first glass fiber prepreg and the carbon tape wound around the outermost periphery were wound so that θ1 was 45 degrees and θ2 was 45 degrees.

[0082] Then, the laminate of Comparative Example 1 wound with the carbon fiber prepreg was subjected to a heat treatment at a heating temperature of 130°C for a treatment time of 2 hours, and a test rod was produced. After the heat treatment, the test rod of Comparative Example 1 had a length of 1500 mm, a diameter of 2 mm at the tip, and a diameter of 10 mm at the rear end. A test rod with a circular hollow cross section was obtained, with a space of 1 mm in diameter inside the tip and a space of 5 mm in diameter inside the rear end.

[0083] The rear ends of the test rods of Example 1 and Comparative Example 1 were fixed, and a 375 g weight was hung from the tip. This state is shown in Figures 6 and 7. Note that Figure 6 shows the test rod made of carbon fiber of Comparative Example 1, and Figure 7 shows the test rod of Example 1.

[0084] As is clear from FIGS. 6 and 7, when a weight was hung, the test rod of Example 1 (FIG. 7) was more easily bent than the test rod of Comparative Example 1 made of only carbon fiber (FIG. 6). Furthermore, when the weights were measured, the test rod of Example 1 weighed 51 g, and the test rod of Comparative Example 1 made of carbon fiber only weighed 49 g. Furthermore, since the inclusion of glass fiber prepreg increases the weight, a fishing rod made only of glass fiber layers will be the heaviest.

[0085] From these results, it can be seen that the test rod of Example 1 bends firmly when a load is applied, and is lighter in weight than a fishing rod made of glass fiber. This difference becomes larger as the fishing rod becomes longer and thicker, which greatly changes its performance.

[0086] The weight of the weight hung from the tip of the test rod of Example 1 and the test rod of Comparative Example 1 was increased, and the weight at which the rod broke was determined. As a result, the test rod of Example 1 broke at 9.2 kg, and the test rod of Comparative Example 1 broke at 7.9 kg. This verified that the test rod of Example 1 was less likely to break.

[0087] Next, a torsion bending test was carried out. That is, the tip of the test rod of Example 1 and Comparative Example 1 was twisted left and right, and the weight at which it broke was determined. As a result, the test rod of Example 1 broke at 8.6 kg, and the test rod of Comparative Example 1 broke at 7.2 kg. This verified that the test rod of Example 1 was less likely to break. [Explanation of symbols]

[0088] 1 fishing rod 1A space section 2 carbon tape 3 First glass fiber layer 4 carbon tape 5 First carbon fiber layer 6 Second fiberglass layer 7 Second carbon fiber layer 8. Third fiberglass layer 9. Third carbon fiber layer 10 Fourth glass fiber layer 11 Fourth carbon fiber layer 12 Fifth glass fiber layer 13 Fifth carbon fiber layer 14 Sixth fiberglass layer 15 Sixth carbon fiber layer 16 Seventh glass fiber layer A Core 20,22,24,26,28,30,32 Glass fiber prepreg 21, 23, 25, 27, 29, 31 Carbon fiber prepreg

Claims

1. A fishing rod having a circular hollow cross section, a first glass fiber layer formed on the innermost side of the rod and extending over the entire length of the rod in the axial direction; a first carbon fiber layer formed on the outer peripheral surface of the first glass fiber layer and extending over the entire length of the rod in the axial direction; a second glass fiber layer formed on the outer peripheral surface of the first carbon fiber layer and covering at least the first carbon fiber layer from the middle to the butt end of the fishing rod; At least The fishing rod further comprises a carbon fiber layer and a glass fiber layer laminated at least once on the outer peripheral surface of the second glass fiber layer, and the laminated carbon fiber layer is covered with the laminated glass fiber layer.

2. 2. The fishing rod according to claim 1, wherein the second glass fiber layer is formed so as to cover the entire first carbon fiber layer from the tip end to the butt end of the rod.

3. a carbon tape is wound around the outer peripheral surface of the first glass fiber layer; The carbon tape is wound in one direction at an angle of 35 to 45 degrees relative to the axis of the rod, and is wound in the opposite direction to the winding direction at an angle of 35 to 45 degrees relative to the axis of the rod, 2. The fishing rod according to claim 1, further comprising a first carbon fiber layer formed on an outer peripheral surface of the carbon tape.

4. the first glass fiber layer and the first carbon fiber layer have a first length dimension; a second glass fiber layer formed on the first carbon fiber layer has a second length dimension that is equal to or less than the first length dimension; the carbon fiber layer and the glass fiber layer laminated on the second glass fiber layer have a third length dimension that is equal to or less than the second length dimension; 2. The fishing rod according to claim 1, wherein the third length dimension is shortened each time a carbon fiber layer and a glass fiber layer are laminated, and the length dimension is shortened from the rear end of the rod of the laminated carbon fiber layer and glass fiber layer.

5. a carbon tape is formed on the outer peripheral surface of the outermost glass fiber layer; 2. The fishing rod according to claim 1, wherein the carbon tape is wound in one direction at an angle of 35 to 45 degrees relative to the axis of the rod, and is wound in the opposite direction to the winding direction at an angle of 35 to 45 degrees relative to the axis of the rod.

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