JP7394084B2 - fishing rod - Google Patents

Description

FIELD OF THE INVENTION The present invention relates to fishing rods.

For example, a fishing rod is known that includes a tube body with a hollow portion and a solid body (see Patent Document 1). By using a solid body for a fishing rod, it is possible to make it thin and soft, and since it is highly rigid despite its thinness, it is possible to set a large curvature.

The solid body includes a solid core material and a joining layer formed on the base end side of the solid core material and joined to the hollow part of the tube body. The joint layer is formed by winding a prepreg sheet around the proximal end of a solid core material so that it has a large diameter (thickness) and is made of fiber-reinforced resin. Thereby, the solid body can be joined to the hollow part of the tube without any gaps.

Japanese Patent Application Publication No. 2000-93559

If the joint layer of a solid body is made thick with fiber-reinforced resin, the difference in coefficient of linear expansion between the solid core material and the joint layer will increase, causing the problem that cracks will occur in the solid core material. . By setting the orientation direction of the fibers of the fiber-reinforced resin in the joint layer at 0 degrees with respect to the axis (parallel to the axis), cracking of the solid core material described above can be prevented. There is a problem in that cracks (white line-shaped cracks) occur in a direction parallel to the axis.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a fishing rod that can prevent the occurrence of cracks and cracks in the solid body.

In order to solve the above-described problems, the present invention provides a tubular body having a hollow portion, a solid solid core material formed of a fiber-reinforced resin in which reinforcing fibers are oriented parallel to the axial direction, and a solid body comprising a joint layer formed of fiber-reinforced resin on the proximal end side of the solid core material and joined to the hollow portion, the direction of orientation of the reinforcing fibers of the joint layer being the same as that of the solid body; It is characterized by an angle of ±5 to 35 degrees with respect to the axis of the body.

According to the present invention, by setting the fiber orientation direction of the joint layer at ±35 degrees or less with respect to the axis of the solid body, the difference in linear expansion coefficient between the solid core material and the joint layer can be reduced. This prevents the solid core material from cracking. Further, by setting the orientation direction of the fibers in the joint layer at an angle of ±5 degrees or more with respect to the axis of the solid body, it is possible to prevent cracks from occurring in the joint layer.

Further, it is preferable that a reinforcing layer containing fiber-reinforced resin is provided around the outer periphery of the solid core material. According to the present invention, it is possible to increase the rigidity of the fishing rod, and also to adjust the fishing rod.

Further, it is preferable that the reinforcing fibers of the reinforcing layer are oriented at an angle of ±0 to 35 degrees with respect to the axis of the solid body.
Further, it is preferable that the main material of the solid core material is unsaturated polyester, and the main material of the joint layer is epoxy resin.

According to the fishing rod of the present invention, cracks and cracks in the solid body can be prevented from occurring.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side sectional view which shows the fishing rod based on 1st embodiment of this invention. 2 is a sectional view taken along the line II-II in FIG. 1. FIG. It is a schematic diagram showing the orientation direction of reinforcing fibers of the joint layer according to the first embodiment. It is a side sectional view showing a fishing rod concerning a second embodiment. It is a schematic diagram which shows the orientation direction of the fiber of the joint layer based on the comparative example 1 of an evaluation test. FIG. 6 is a schematic diagram showing the orientation direction of fibers in the joint layer according to Comparative Example 2 of the evaluation test. FIG. 6 is a schematic diagram showing the orientation direction of fibers in the joint layer according to Comparative Example 3 of the evaluation test. FIG. 6 is a schematic diagram showing the orientation direction of fibers in a joint layer according to Comparative Example 4 of the evaluation test. It is a table showing the results of the evaluation test.

[First embodiment]
Hereinafter, a first embodiment of a fishing rod according to the present invention will be described. In addition, in the description of the drawings, the same elements are given the same reference numerals, and duplicate descriptions will be omitted as appropriate. In the following description, "front and rear" refers to the tip side of the rod as "front" and the grip side as "rear" according to the arrows in FIG. 1. Note that this direction is used for convenience of explanation, and does not limit the direction of the present invention.

As shown in FIGS. 1 and 2, the fishing rod 1 of this embodiment includes a tube body 10 and a solid body 20. The tubular body 10 is a tubular body having a substantially circular cross section. The tube body 10 includes a hollow portion 11 along the front-rear direction. The front side of the hollow portion 11 is open forward. The fishing rod 1 is formed by joining the rear end of a solid body 20 to a hollow portion 11 of a tube body 10.

Although this embodiment illustrates a multi-piece rod in which two or more piece rods are joined together, the present invention may also be applied to a form in which the solid body 20 is joined to a grip (butt joint), for example. good. That is, the present embodiment includes both a case in which the tubular body 10 and the solid body 20 are removably fitted together, and a case in which both are bonded and joined together.

The solid body 20 includes a solid core material 21, a reinforcing layer 22, and a joint layer 23. The solid core material 21 is a solid member and has a cylindrical shape. The solid core material 21 is formed including fiber-reinforced resin. The solid core material 21 can be formed, for example, by a known pultrusion method. Specifically, the solid core material 21 is formed by drawing continuous thread-like reinforcing fibers (carbon fiber, glass fiber, etc.) through a synthetic resin tank filled with synthetic resin. The type of synthetic resin (main material) may be appropriately selected from thermosetting resins such as unsaturated polyester, epoxy resin, phenol resin, and vinyl ester resin, but unsaturated polyester is used in this embodiment. The orientation direction of the reinforcing fibers may be set as appropriate, but the solid core material 21 is formed to include reinforcing fibers that are at least parallel to the axis L.

The reinforcing layer 22 is a layered portion formed of fiber-reinforced resin over the entire circumferential direction of the solid core material 21 . The reinforcing layer 22 can increase the rigidity and also adjust (adjust) the fishing rod 1. The reinforcing layer 22 may be provided all over the solid core material 21 in the front-rear direction, or may be provided only on a portion thereof. The reinforcing fibers of the reinforcing layer 22 are, for example, carbon fibers, glass fibers, or the like. The reinforcing layer 22 can be formed by winding a prepreg sheet in which reinforcing fibers are impregnated with a synthetic resin and heat-treating the prepreg sheet. Although the type of synthetic resin (main material) of the reinforcing layer 22 may be set as appropriate, epoxy resin is used in this embodiment. The orientation direction of the reinforcing fibers of the reinforcing layer 22 may be set as appropriate, and is set to, for example, 0 to 35 degrees.

The joining layer 23 is a layered portion formed of fiber-reinforced resin over the entire circumferential direction of the reinforcing layer 22 at the rear end (base end) of the reinforcing layer 22 . The joint layer 23 is formed so that only the rear end portion of the reinforcing layer 22 is thick (large diameter). Thereby, the joining layer 23 is joined to the hollow part 11 of the tube body 10 without any gaps. The length of the joint layer 23 in the front-rear direction is, for example, about 3 to 20 cm, preferably about 5 to 15 cm. As shown in FIG. 3, the reinforcing fibers of the joint layer 23 are, for example, carbon fibers, glass fibers, or the like. The joint layer 23 can be formed by winding a prepreg sheet or the like in which reinforcing fibers are impregnated with a synthetic resin and heat-treating the sheet. After the resin has hardened, the thick portion can be cut to form the joint layer 23, if necessary.

Although the type of synthetic resin (main material) of the joint layer 23 may be set as appropriate, epoxy resin is used in this embodiment. The joint layer 23 is formed so that the orientation direction of the reinforcing fibers is inclined at an angle of ±5 to 35 degrees with respect to the axis L, more preferably ±10 to 25 degrees.

Note that the vf (fiber volume) of the reinforcing layer 22 and the joint layer 23 may be set as appropriate, and for example, both may be set to be larger than the vf of the solid core material 21.

In the fishing rod 1, after a solid core material 21 is formed, a prepreg sheet for the reinforcing layer 22 and a prepreg sheet for the joint layer 23 are sequentially wound around the solid core material 21, and heated and cured. Thereby, the fishing rod 1 can be manufactured. Note that the fishing rod 1 may be manufactured using other methods or orders.

<Conventional issues (problem location)>
The conventional issues will be explained in detail. A solid core material can be formed to be thin and soft, but as it can be made thinner, the difference in diameter between the hollow tube and the solid body tends to increase. Therefore, there is a problem in that stress is concentrated at the joint layer (joint portion) between the tube body and the solid body. In particular, conventional fishing rods have had problems with "cracks that occur when the rod is molded" and "cracks that occur when the rod is bent."

<<Cracks that occur during molding of fishing rods>>
When molding a rod, after being heated and hardened, the solid core material contracts or expands relative to the joint layer. When the solid core material contracts, there is a risk that a gap (peeling) may occur between the solid core material and the joint layer. On the other hand, if the solid core material expands due to residual stress or the like, there is a risk that the joint layer will crack due to the expansion.

In order to solve these problems, it is possible to make the physical properties of the solid core material and the joint layer similar. For example, it is conceivable that the resin materials of the solid core material and the joint layer are both unsaturated polyesters or both epoxy resins. However, considering the adhesion, rigidity, and condition of the parts, the reality is that the solid core material is made of unsaturated polyester and the joint layer is made of epoxy resin, and it is difficult to use the same resin material. situation.

In addition, in order to prevent cracks caused by the expansion of the solid core material, it is possible to make the joint layer thicker, but the difference in linear expansion coefficient with the solid core material becomes large, and the radial direction of the solid core material increases. There is a risk of cracking.

<<Cracks that occur when the rod bends>>
If the curvature of the rod becomes large, the joint layer will not be able to follow the deflection of the solid core material, and there is a risk that the joint layer will crack (split) parallel to the axis. In order to solve this problem, it is conceivable to make the orientation direction of the reinforcing fibers of the joint layer oblique. However, since the reinforcing fibers of the solid core material are normally oriented at 0 degrees (parallel) to the axis, if the orientation direction of the reinforcing fibers of the joint layer is set to 45 degrees, for example, the reinforcing fibers of the solid core material The angle difference between the reinforcing fibers becomes large. As the angular difference between reinforcing fibers increases, the difference in linear expansion coefficient also increases. Therefore, if the orientation direction of the reinforcing fibers in the joint layer is set to 45 degrees, the difference in linear expansion coefficient between the solid core material and the joint layer becomes large, causing cracks. In order to prevent this, it is possible to set the reinforcing fiber orientation direction of the joint layer to 0 degrees to match the solid core material, but cracks occur in the joint layer in the direction parallel to the axis. There is a risk of it tearing and causing white lines.

<Actions and effects of this embodiment>
In this regard, according to the fishing rod 1 according to the embodiment described above, the reinforcing fibers of the joint layer 23 are oriented at an angle of ±5 to 35 degrees, preferably 10 to 25 degrees, with respect to the axis L. , cracks and cracks in the solid body 20 can be prevented. More specifically, by setting the orientation direction of the reinforcing fibers of the joint layer 23 to ±35 degrees or less, it is possible to reduce the difference between the linear expansion coefficient of the solid core material 21 and the linear expansion coefficient of the joint layer 23. Therefore, cracking of the solid core material 21 can be prevented. Further, by setting the orientation direction of the reinforcing fibers of the joint layer 23 at ±5 degrees or more with respect to the axis L, it is possible to prevent cracks from forming in the joint layer 23.

Further, as in this embodiment, it is preferable to form a reinforcing layer 22 between the solid core material 21 and the joint layer 23. Thereby, the rigidity of the fishing rod 1 can be increased, and the condition can be adjusted.

Further, by setting the orientation direction of the reinforcing fibers of the reinforcing layer 22 at ±0 to 35 degrees with respect to the axis L, the difference in linear expansion coefficients between the reinforcing layer 22 and the joint layer 23 can be reduced. Note that the orientation direction of the reinforcing fibers in the reinforcing layer 22 may be set to be the same as the orientation direction of the reinforcing fibers in the joining layer 23. Thereby, the physical properties of the reinforcing layer 22 and the joint layer 23 can be made similar.

Further, the main material of the solid core material 21 is preferably unsaturated polyester, and the main material of the joint layer 23 is preferably an epoxy resin. Thereby, it is possible to provide a fishing rod 1 with excellent adhesion between members, rigidity, etc. Furthermore, according to the present embodiment, even in a situation where it is not possible to uniformize the types of resins, cracks and cracks in the solid body 20 can be easily prevented by simply changing the orientation direction of the reinforcing fibers.

[Second embodiment]
Next, a fishing rod according to a second embodiment of the present invention will be described. As shown in FIG. 4, a fishing rod 1A according to the second embodiment includes a tubular body 10 and a solid body 20A including a solid core material 21 and a joint layer 23. As in the fishing rod 1A, the reinforcing layer 22 may be omitted and the joint layer 23 may be formed directly on the outer periphery of the solid core material 21. Other configurations and effects of the second embodiment are the same as those of the first embodiment, so descriptions thereof will be omitted.

[Evaluation test]
Next, an evaluation test for fishing rods will be explained. A plurality of examples and comparative examples of the above-described embodiments were created and the following two evaluation tests were conducted.
(1) A large load was applied to the fishing rod, and it was evaluated whether cracks would occur in the solid body at a predetermined curvature (when the curvature became large).
(2) It was evaluated whether cracks would occur in the solid body during molding.

In addition, the cracks and fractures of the solid bodies of Examples and Comparative Examples were evaluated based on the following criteria.
"◎": There are almost no constraints on the joint layer thickness.
"○": The constraint on the joint layer thickness is loose (less).
“△”: Constraints on joint layer thickness are normal (exist).
"×": The constraints on the joint layer thickness are severe (many).

Note that the orientation direction of the reinforcing fibers of the solid core material 21 is 0 degrees. Further, in this test, the reinforcing layer 22 was not provided between the solid core material 21 and the joint layer 23.

[Example]
In the example, the reinforcing layer 22 was omitted, and the reinforcing fiber resin was wound around the solid core material 21 to form the joint layer 23. As shown in FIG. 9, there are seven orientation directions of the reinforcing fibers in the joint layer 23: ±5 degrees, ±10 degrees, ±15 degrees, ±20 degrees, ±25 degrees, ±30 degrees, and ±35 degrees. Set.

[Comparative example 1]
In Comparative Example 1, as shown in FIG. 5, a joint layer 23A including carbon fibers was formed around the outer periphery of the solid core material 21. The orientation direction of the carbon fibers of the joint layer 23A was set to 0 degrees.

[Comparative example 2]
In Comparative Example 2, as shown in FIG. 6, a joint layer 23B including carbon fibers and glass fibers was formed around the outer periphery of the solid core material 21. The orientation direction of the carbon fibers of the joint layer 23B was set to 0 degrees. The orientation directions of the glass fibers of the joint layer 23B were made to intersect at 0 degrees and 90 degrees.

[Comparative example 3]
In Comparative Example 3, as shown in FIG. 7, a joint layer 23C including carbon fibers was formed around the outer periphery of the solid core material 21. The orientation directions of the carbon fibers in the joint layer 23C were crossed at 0 degrees and 90 degrees.

[Comparative example 4]
In Comparative Example 4, as shown in FIG. 8, a joint layer 23D including carbon fibers was formed around the outer periphery of the solid core material 21. The orientation directions of the carbon fibers in the joint layer 23D were crossed at ±45 degrees.

The results of each evaluation test are shown in FIG. 9. As shown in FIG. 9, in Comparative Example 1, cracks did not occur in the solid during molding, but cracks occurred in the solid body 20 when the deflection (curvature) of the rod increased. In Comparative Example 2, cracks did not occur during molding, but cracks occurred when the deflection (curvature) of the rod increased. In Comparative Examples 3 and 4, no cracks occurred when the deflection (curvature) of the rods increased, but solid cracks occurred during molding.

On the other hand, in the example, when the orientation direction of the reinforcing fibers in the joint layer 23 was between ±5 and 25 degrees, cracks did not occur when the deflection (curvature) of the rod increased, and cracks did not occur during molding. There was nothing to do. When the orientation direction of the reinforcing fibers in the joint layer 23 was ±30 to 35 degrees, cracks did not occur when the deflection (curvature) of the rod increased, but some cracks occurred during molding.

The embodiments according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and each component can be modified as appropriate without departing from the spirit of the present invention. For example, although the reinforcing fibers included in the fiber-reinforced resin of the joint layer of this embodiment are carbon fibers, they may also be glass fibers or the like.

1 Fishing rod 10 Pipe body 20 Solid body 21 Solid core material 22 Reinforcement layer 23 Joint layer L Axial core

Claims (4)

a pipe body with a hollow part;
A solid solid core material formed of a fiber-reinforced resin in which reinforcing fibers are oriented parallel to the axial direction, and a fiber-reinforced resin formed on the base end side of the solid core material and spliced into the hollow part. a solid body having a joint layer;
A fishing rod characterized in that the orientation direction of the reinforcing fibers of the joint layer is ±5 to 35 degrees with respect to the axis of the solid body. The fishing rod according to claim 1, further comprising a reinforcing layer containing fiber-reinforced resin on the outer periphery of the solid core material. The fishing rod according to claim 2, wherein the reinforcing fibers of the reinforcing layer are oriented in an angle of ±0 to 35 degrees with respect to the axis of the solid body. The fishing rod according to any one of claims 1 to 3, wherein the main material of the solid core material is unsaturated polyester, and the main material of the joint layer is epoxy resin.

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