fishing rod

Abstract

To provide a fishing rod that reduces the defect rate during molding and processing and improves workability. [Solution] A fishing rod comprising a joint section 30 that connects a large-diameter rod 20 and a small-diameter rod 10 formed by winding a fiber-reinforced prepreg sheet, wherein the joint section 30 of the small-diameter rod 10 comprises a processed layer 11 exposed on the surface, a main body layer 12 wound longer in the axial direction than the processed layer 11 wound around the joint section 30, and an adjustment layer 13 in which reinforcing fibers are aligned in an oblique direction with respect to the axial direction. The adjustment layer 13 is characterized in that it is disposed on the inner side of the outermost layer of the main body layer 12.

Description

Technical Field

[0001] The present invention relates to a fishing rod provided with a joint portion provided at the ends of adjacent rod bodies for joining the rod bodies together.

Background Art

[0002] Conventionally, in a fishing rod having a plurality of rod bodies, joint portions (joint structures) are provided at the ends of a small-diameter rod body and a large-diameter rod body. For example, Patent Document 1 discloses a configuration in which an obliquely oriented fiber layer in which reinforcing fibers are aligned in a direction inclined with respect to the axial length direction (for example, ±45°) is provided in the joint portion, thereby ensuring the strength of the joint portion and suppressing plastic bending.

[0003] In addition, such an obliquely oriented fiber layer serves as a reinforcing layer (also referred to as an adjustment layer), and by being wound around the outermost layer, it also serves as a processing layer that is centerless processed during finishing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above-described joint portion, it has been found that when centerless processing is performed after winding a prepreg sheet, fine irregularities occur on the surface. This is considered to be due to variations in the depth of processing (depth from the outer surface) caused by differences in the orientation of the reinforcing fibers between layers, resin shortage, and disturbances in the roundness after molding caused by taping.

[0006] Furthermore, while carp fishing rods, in particular, are painted after processing to improve their appearance, applying paint to areas with the fine irregularities mentioned above can cause air bubbles to form, reducing their aesthetic appeal. This is especially true for carp fishing rods with low-taper joints, where defects are more likely to occur after processing, and traditionally, correcting such defects was time-consuming.

[0007] The purpose of this invention is to provide a fishing rod that can reduce the defect rate during molding and processing and improve workability. [Means for solving the problem]

[0008] The fishing rod according to the present invention is equipped with a joint that connects a large-diameter rod and a small-diameter rod formed by winding a fiber-reinforced prepreg sheet, wherein the joint of the small-diameter rod comprises a processed layer exposed on the surface, a main body layer wound longer in the axial direction than the processed layer wound around the joint, and an adjustment layer in which reinforcing fibers are aligned in an oblique direction with respect to the axial direction, wherein the adjustment layer is disposed on the inner side of the outermost layer of the main body layer.

[0009] The joint of the small-diameter rod of the fishing rod described above can be made stronger and less prone to plastic bending by providing an adjustment layer in which reinforcing fibers are aligned diagonally with respect to the axial length. Since this adjustment layer is located on the inner side of the outermost layer of the main body layer and the processed layer exposed on the surface, when the surface is centerless machined, fine irregularities will not be exposed on the surface, reducing the need for correction work after painting. In other words, a fishing rod can be obtained that reduces the defect rate and improves workability during molding and processing. [Effects of the Invention]

[0010] According to this invention, a fishing rod can be obtained that reduces the defect rate during molding and processing and improves workability. [Brief explanation of the drawing]

[0011] [Figure 1]This is a cross-sectional view along the axial direction showing an enlarged view of the joint between the small-diameter rod and the large-diameter rod after processing of the first embodiment of the present invention. [Figure 2] This diagram shows the state of the fiber-reinforced prepreg sheet being wrapped around the core metal of a small-diameter rod before processing. [Figure 3] This diagram shows a second embodiment of the present invention, with an enlarged cross-sectional view along the axial direction showing the joint between the small-diameter rod and the large-diameter rod. [Modes for carrying out the invention]

[0012] The embodiments of the fishing rod according to the present invention, and the joint between the small-diameter rod and the large-diameter rod, will be described in detail below with reference to the attached drawings.

[0013] Figure 1 is a diagram showing the first embodiment, and is a cross-sectional view showing the joint between the small-diameter rod and the large-diameter rod along the axial direction. In this embodiment, a parallel joint method is used for the joint of the fishing rod, and in the figure, the rod on the left is shown as the small-diameter rod (tip-side rod), and the rod on the right is shown as the large-diameter rod (handle-side rod). Furthermore, in the above configuration, the large-diameter rod and the small-diameter rod only need to be connected axially by the joint described below, and there are no limitations on the type of fishing rod, the number of rod joints, or whether or not a reel seat or fishing line guide is provided.

[0014] The fishing rod 1 of this embodiment is equipped with a joint section 30 that connects a small-diameter rod 10 and a large-diameter rod 20, with the handle end of the small-diameter rod 10 and the tip end of the large-diameter rod 20 being detachably joined in the axial direction. In this case, the small-diameter rod 10 and the large-diameter rod 20 represent the relationship between adjacent rods, and the large-diameter rod 20 is further defined as a small-diameter rod when joined with the rod on the handle side.

[0015] The small-diameter rod 10 and the large-diameter rod 20 are formed into a tubular shape by winding a fiber-reinforced prepreg sheet around a core metal M, curing the synthetic resin of the fiber-reinforced prepreg sheet by heat treatment, and then removing the core, as is well known. In this case, the formed rod may have a solid section in part or all of it.

[0016] The small-diameter rod 10 has a smaller diameter at the joint portion 30 than the large-diameter rod 20. The handle end of the small-diameter rod 10 is press-fitted into the tip end opening of the large-diameter rod 20, thereby joining the two rods axially in the region of the joint portion 30 (indicated as the joint region R). For this reason, the outer circumferential surface of the handle end of the small-diameter rod 10 and the inner circumferential surface of the large-diameter rod 20 have different taper ratios so that they can be joined and fixed axially. Furthermore, the fiber-reinforced prepreg sheets that make up the small-diameter rod 10 and the large-diameter rod 20 can be made up of multiple sheets, and each reinforced fiber prepreg sheet can be appropriately deformed in terms of the orientation direction of the reinforcing fibers, wall thickness, number of turns, type of reinforcing fibers, etc.

[0017] The joint section 30 is formed by winding a prepreg sheet made of fiber-reinforced resin. The joint section 30 comprises a plurality of fiber-reinforced resin prepreg sheets 10A wound around the joint area R on the handle side of the small-diameter rod 10, and a plurality of fiber-reinforced resin prepreg sheets 20A wound around the joint area R on the tip side of the large-diameter rod 20. These are configured so that the ends of both rods can be fitted together by the tapered structure described above.

[0018] In this embodiment, the present invention is characterized by a plurality of prepreg sheets 10A that are wound around the small-diameter rod 10, which is a small-diameter rod that has been centerless processed, including the joint region R on the outer peripheral surface of the handle side. The specific configuration of the plurality of prepreg sheets 10A will be described below.

[0019] The joint portion 30 can be integrally formed with the small-diameter rod 10 when forming the small-diameter rod 10 as described above. For example, when forming the small-diameter rod 10 by winding a fiber-reinforced prepreg sheet around a core metal M (see Figure 2), the joint portion can be integrally formed by winding the prepreg sheet for the joint portion so that it protrudes on the handle side in a direction perpendicular to the axial length of the core metal.

[0020] The joint portion 30 of the small-diameter rod 10 includes a processed layer 11 exposed on the surface, a main body layer 12 wound longer in the axial length direction than the processed layer 11 wound around the joint portion 30, and an adjustment layer 13 in which reinforcing fibers are aligned obliquely with respect to the axial length direction.

[0021] Each of the above layers 11, 12, and 13 is composed of a prepreg sheet of a fiber-reinforced resin containing reinforcing fibers, such as carbon or glass. For the processed layer 11, since centerless processing is finally performed, in order not to generate fine irregularities on the surface, those in which the reinforcing fibers are aligned, for example, a prepreg sheet in which the reinforcing fibers are bonded together in the axial length direction (0°) and the circumferential direction (90°) to form one layer, or those in which the reinforcing fibers are oriented in the axial length direction (0°) or the circumferential direction (90°) are preferably used.

[0022] As shown in FIG. 2, the main body layer 12 is wound radially inward of the processed layer 11 and is composed of a fiber-reinforced resin prepreg sheet longer in the axial length direction than the axial length L of the processed layer 11, and is wound 1.5 plies or more (shown as 2 plies in FIG. 1, but the number of windings is not limited, such as making it approximately 4 plies as shown in FIG. 2). Note that the main body layer 12 may be wound over the entire length when forming the small-diameter rod 10, or may be composed of a prepreg sheet formed by bonding two different types (any one of the fiber type, direction, and basis weight) of prepreg sheets into one sheet. Or, it may be configured to cover the end of winding of the adjustment layer (having a larger number of plies than the adjustment layer).

[0023] The main body layer 12 may be composed of a plurality of independent prepreg sheets. In this case, an adjustment layer may be provided between the first main body layer and the second main body layer, and at this time, as shown in FIG. 3 described later, the adjustment layer may be completely covered by the second main body layer.

[0024] The adjustment layer 13 only needs to be positioned on the inner side (not exposed on the surface) of the outermost layer of the main layer 12. This adjustment layer 13 has the function of suppressing plastic deformation when a large bending stress is applied to the joint 30. For example, it can be constructed by bonding together two types of prepreg sheets in which the reinforcing fibers are oriented diagonally in different directions. In this case, it is preferable that such an adjustment layer 13 is a diagonally oriented fiber layer (bias layer) in which the diagonally oriented reinforcing fibers are oriented symmetrically with respect to the axis (for example, ±30° or ±45° with respect to the axial direction). The orientation angle of the diagonal direction of the two bonded reinforcing fibers does not need to be symmetrical, and there may be some error (for example, within ±5°).

[0025] In this way, by positioning the adjustment layer 13 on the inner side of the outermost layer of the main layer 12, the adjustment layer 13 is pressed down by the main layer 13, and a stable winding state is obtained without the reinforcing fibers of the adjustment layer 13 opening up. Furthermore, as shown in Figure 2, it is preferable that the main layer 12 has more layers than the adjustment layer 13. With such a main layer 12, it is possible to ensure strength at the joint 30 along the entire length. Moreover, since the adjustment layer 13 is on the inner side of the main layer 12 and is not exposed, it is preferable that the number of windings of the adjustment layer 13 be less than that of the main layer 12. For example, if the main layer 12 is wound with 1.5 plies or more, it is sufficient for the adjustment layer to be wound with about 1 to 1.4 plies.

[0026] Furthermore, the entire circumference of the adjustment layer 13, or at least a portion of it (a portion in the circumferential direction; see Figure 2), may form the innermost layer. This allows it to be pressed against the mandrel during molding, making it less likely for defects to occur during processing. Also, since the processed layer 11 is removed when surface processing such as centerless machining is performed, it is preferable that it is wound so that about 0 to 2 plies remain after processing. In Figure 2, after an arbitrary number of turns (approximately 9 plies are shown, but it is not limited to this), surface processing is performed so that it becomes approximately 1 ply, as shown in Figure 1.

[0027] As mentioned above, after sanding the surface, painting is applied to improve the appearance. This painting is done by spraying, wiping, printing, etc., and as mentioned above, the outermost surface has its fine irregularities suppressed, so the occurrence of air bubbles is prevented as much as possible, the aesthetic appearance does not deteriorate, and the effort required for correction work is eliminated.

[0028] Figure 3 shows a second embodiment of the present invention, and is an axial cross-sectional view showing an enlarged view of the joint between the small-diameter rod and the large-diameter rod. The adjustment layer 13 provided at the joint of the small-diameter rod 10 in this embodiment is constructed by winding two or more prepreg sheets so as to be sandwiched between them when forming multiple main body layers 12.

[0029] Thus, the winding configuration of the adjustment layer 13 is not limited, as long as at least a portion of it is arranged radially inward of the main layer 12. [Explanation of Symbols]

[0030] 1 fishing rod 10 Small diameter rod 11 Processing layer 12 Main Layer 13 Adjustment layer 20 Large diameter fishing rod 30 Joint M core metal

Claims

1. A fishing rod having a joint section for joining a large-diameter rod and a small-diameter rod, which are formed by winding a fiber-reinforced prepreg sheet, The joint portion of the small-diameter rod comprises a processed layer exposed on the surface, a main body layer wound longer in the axial direction than the processed layer wound around the joint portion, and an adjustment layer in which reinforcing fibers are aligned in an oblique direction with respect to the axial direction. The adjustment layer is located on the inner side of the outermost layer of the main body layer, and is a fishing rod.

2. The fishing rod according to claim 1, wherein the main body layer has more layers than the adjustment layer.

3. The fishing rod according to claim 1, wherein the reinforcing fibers of the adjustment layer are formed by laminating two types of sheets, each with a fiber direction oblique to the axial length direction and having a different oblique direction.

4. The fishing rod according to any one of claims 1 to 3, wherein at least a portion of the adjustment layer forms the innermost layer.

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