JP2000300123A - In-low joint fishing rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject fishing rod improved in rod pipe torsional rigidity and keeping the equilibrium between the preceding rigidity and both the bending and crushing rigidity, thereby achieving its proper bending and prevented from rod pipe breakage. SOLUTION: This in-low-joint fishing rod is made up of a larger-diameter rod pipe Ra, a smaller-diameter rod pipe Rb, and joint bars J1, J2, J3, J4. Each of the joint bars J1, J2, J3, J4 consists of slant fiber-reinforced synthetic resin containing slant fibers oriented slantly relative to the axial direction of the bar, and the slant fibers are composed of 1st fibers f1 and 2nd fibers f2, and these two kinds of fibers may be substantially symmetrically crossedly oriented with respect to the respective axial directions of the joint bars J1, J2, J3, J4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spigot fishing rod.

[0002]

2. Description of the Related Art A spigot fishing rod is composed of a large-diameter rod pipe, a small-diameter rod pipe, and a connecting rod fixed to one of them for connecting the large-diameter rod pipe and the small-diameter rod pipe. I have.

[0003] With respect to this type of spigot joint fishing rod, Japanese Utility Model Application Laid-Open No. 58-52958 discloses a technique for connecting a large-diameter rod pipe and a small-diameter rod pipe using a specially shaped connecting rod. Such a connecting rod is generally formed as a solid member in which carbon fibers are oriented in the axial direction. As another example, the connecting rod is a prepreg in which carbon fibers are oriented in the axial direction and impregnated with a thermosetting resin, and another prepreg in which carbon fibers are oriented in the circumferential direction and impregnated with a thermosetting resin. May be formed as a hollow member by stacking them on each other, winding them around a cored bar, and firing them under pressure.

[0004] According to the above-mentioned spigot type fishing rod, high rigidity against bending and crushing of the fishing rod can be obtained by the carbon fibers oriented in the axial direction and / or the circumferential direction of the fishing rod.

[0005]

However, in the spigot splicing rod described above, the reinforcing fibers, that is, carbon fibers, are oriented only in the axial direction and / or the circumferential direction of the splicing rod. The rigidity in the direction oblique to the direction tends to be insufficient. As a result, there was a problem that sufficient torsional rigidity was not obtained, it was difficult to fly the device to the target point, and it was difficult to capture fish. In particular, when taking in fish that tend to run away from side to side, such as medina or gibberish, the above-mentioned problem appears remarkably, and the fishing rod is twisted to the left and right, and it is not easy for the angler to take in as intended. .

Further, in the spigot joint fishing rod described above, since the rigidity of the fishing rod against bending and crushing is excessively increased, when stress is concentrated on the joint between the joint rod and the rod pipe,
There was a risk that the fishing rod would not bend properly and the rod tube would break. As described above, in the spigot joint fishing rod in which the large-diameter rod pipe and the small-diameter rod pipe are joined by the joining rod, which is a separate member, at the joint, the torsional rigidity is insufficient as described above, while the fishing rod is not bent or crushed. The stiffness was excessively increased, and it was difficult to solve the problem caused by such stiffness imbalance.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the torsional rigidity of a rod tube to maintain a balance with the rigidity against bending and crushing of the rod tube, thereby realizing proper bending and preventing damage to the rod tube. An object of the present invention is to provide a spigot fishing rod that can be used.

[0008]

In order to solve the above-mentioned problems, the present invention according to claim 1 relates to a connecting rod (J1, J2, J3) for connecting a large diameter rod pipe (Ra) and a small diameter rod pipe (Rb). , J4), the connecting rods (J1, J2, J3, J4) are made of an inclined fiber reinforced synthetic resin containing inclined fibers oriented obliquely to the axial direction thereof. It is characterized by.

According to a second aspect of the present invention, in the spigot spliced fishing rod of the first aspect, the inclined fiber is a first fiber (f1).
And the second fiber (f2), and the first fiber (f1) and the second fiber (f2) are connected to the connecting rod (J
1, J2, J3, J4).

According to a third aspect of the present invention, there is provided the spigot fishing rod according to the first or second aspect, wherein the connecting rods (J1, J
2, J3, J4) are the connecting rods (J1, J2, J3,
J4) An axial fiber reinforced synthetic resin containing an axial fiber (f3) oriented along the axial direction and made of a material different from the inclined fiber, and a composite of the inclined fiber reinforced synthetic resin. Features.

According to a fourth aspect of the present invention, in the spigot fishing rod according to any one of the first to third aspects, the connecting rods (J1, J3, J4) are cylindrical and solid. I do.

According to a fifth aspect of the present invention, in the spigot fishing rod according to any one of the first to third aspects, the connecting rod (J2) is cylindrical, and the connecting rod (J2) is provided at least at both ends thereof. A hole (r) extending in the axial direction of the rod (J2)
pa, fpb) are formed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a spigot fishing rod according to a first embodiment of the present invention will be described in detail with reference to FIG.

The spigot spliced fishing rod A according to the first embodiment of the present invention includes a large-diameter rod pipe Ra, a small-diameter rod pipe Rb, and a connecting rod J.
1 is provided.

The large-diameter rod Ra is formed in a tapered shape so that the outer diameter is gradually reduced from the rear end toward the front end, and has an insertion hole ha inside the front end.

Similarly, the small-diameter rod pipe Rb is also formed in a tapered shape so that the outer diameter gradually decreases from the rear end toward the front end, and has an insertion hole hb inside the rear end. The insertion hole hb is formed in a tapered shape such that the inside diameter decreases gradually from the rear end to the front end side of the small diameter rod tube Rb. The outer diameter and the inner diameter at the rear end face of the small diameter rod pipe Rb are substantially the same as the outer diameter and the inner diameter at the front end face of the large diameter rod pipe Ra, respectively.

In the present invention, the large-diameter rod pipe Ra and the small-diameter rod pipe Rb refer to two adjacent rod pipes among a plurality of rod pipes constituting a fishing rod. Refers to a rod pipe located on the rod tail side of the spliced fishing rod, and the small diameter rod pipe Rb refers to a rod pipe located on the tip side of the fishing rod.

As shown in FIG. 1, the connecting rod J1 is formed in a substantially columnar shape having substantially the same outer diameter over the entire length. The connecting rod J1 is composed of a substantially cylindrical core c1 as shown in FIG. 2A and a reinforcing layer L1 integrally formed on the outer surface thereof.

As shown in FIG. 2A, the core c1 is made of an axial fiber reinforced synthetic resin obtained by impregnating a thermosetting resin into an axial fiber f3 oriented along the axial direction. It is formed in a substantially columnar shape. Here, carbon fibers are used as the axial fibers f3.

The reinforcing layer L1 is formed in a tubular shape from an inclined fiber reinforced synthetic resin so as to cover the entire outer surface of the core c1. In the inclined fiber reinforced rigid resin, the inclined fibers are composed of the first fiber f1 and the second fiber f2, and are oriented such that they symmetrically intersect at an angle of about 45 degrees with respect to the axial direction of the core c1. Have been. Here, as the first fiber f1 and the second fiber f2, the same carbon fiber as the above-described axial fiber f3 is used.

In order to form such a reinforcing layer L1,
In the first embodiment shown in FIG. 1, a cross prepreg cp is used. This cross prepreg cp
Is a woven fabric obtained by impregnating the first fiber f1 and the second fiber f2 with a thermosetting resin, and the first fiber f
1 intersects at an angle of about 45 degrees with respect to the axial direction of the core body c1 in a downward-sloping state as shown in FIG.
The second fiber f2 rises to the right as shown in FIG.
They intersect at an angle of about 45 degrees with the axial direction of the core body c1. Therefore, the first fiber f1 and the second fiber f2 are approximately 90
Intersect each other at an angle of degrees.

The above-mentioned cross prepreg cp has a core c
1 and fired under pressure to form a connecting rod J1.

The above-mentioned connecting rod J1 has its rear end inserted into the insertion hole ha of the large-diameter rod Ra, and is fixed thereto by bonding or the like. In such a fixed state, the connecting rod J1
Of the large-diameter rod Ra protrude from an intermediate portion and a distal end of the large-diameter rod Ra.

In order to join the small-diameter rod pipe Rb to the large-diameter rod pipe Ra, as described above, the distal end of the connecting rod J1 projecting from the distal end of the large-diameter rod pipe Ra is inserted into the insertion hole h of the small-diameter rod pipe Rb.
Insert into b. As described above, since the insertion hole hb is formed in a tapered shape so that the inner diameter decreases gradually from the rear end to the front end side of the small-diameter rod Rb, the connecting rod Jb is formed.
The gap between the distal end of the rod 1 and the inner peripheral surface of the small-diameter rod Rb forming the insertion hole hb decreases as the insertion length of the connecting rod J1 increases. In this manner, the distal end of the connecting rod J1 is inserted to the insertion limit position. In this state, between the distal end of the large diameter rod pipe Ra and the rear end of the small diameter rod pipe Rb, as shown in FIG. A gap G is formed in this portion, and in this portion, the central portion of the connecting rod J1 is exposed.

Here, the cross prepreg c of the connecting rod J1 is used.
In p, as described above, the first fiber f1 and the second fiber f2 intersect each other at an angle of about 90 degrees, and these fibers f1 and f2 are exposed outside the connecting rod J1, A stitch-like pattern is formed. Accordingly, in the gap G between the front end of the large diameter rod pipe Ra and the rear end of the small diameter rod pipe Rb, the connecting rod J
Even if the central part of 1 is exposed, a good appearance is maintained.

According to the through fishing rod A configured as described above, the axial fiber f of the core c1 in the connecting rod J1 is used.
3, and the first fiber f1 and the second fiber f of the reinforcing layer L1
By the method 2, the torsional rigidity of the rod pipe is improved, the balance with the rigidity against bending and crushing of the rod pipe is maintained, so that an appropriate bending can be realized and the rod pipe can be prevented from being damaged.

Cross prepreg cp for reinforcing layer L1
, The first fiber f1 and the second fiber f2 form a core c1
Are described to be symmetrically intersected at an angle of about 45 degrees with respect to the axial direction, but the angle is arbitrary, and it is particularly preferable that the angle be in the range of 20 to 70 degrees. .

The large-diameter rod pipe Ra and the small-diameter rod pipe Rb are
If it is made of the same woven cloth as the above-described cross prepreg cp, the gap G between the large diameter rod pipe Ra and the small diameter rod pipe Rb
The central part of the connecting rod J1 exposed from the outer surface of the rod shows substantially the same pattern as these rods, and it looks as if it is a single rod, and can provide a remarkably beautiful appearance.

It should be noted that the two bias sheets bs1 and bs2 shown in FIGS. 2B and 2C may be used instead of the above-described cross prepreg cp. Bias sheet b
In s1, the first fiber f1 as the inclined fiber is in a state of lowering to the right as shown in FIG. They cross at a 45 degree angle. On the other hand, in the bias sheet bs2, the second fiber f2 as an inclined fiber
2B, in the upward direction, as shown in FIG. 2C, in the length direction of the bias sheet bs2 (that is, in the axial direction of the core member c1).
At an angle of about 45 degrees.

The above-mentioned bias sheets bs1, bs2
Means that each of the first fiber f1 and the second fiber f2 is about 90
It is laminated and pasted so that it crosses each other at an angle of degrees,
The connecting rod is formed by being wound around the core c1 and firing it under pressure. By using the two bias sheets bs1 and bs2 as described above, the first bias sheet bs1 and bs2 can be used.
The fibers f1 and the second fibers f2 are arranged substantially symmetrically with respect to the axial direction of the core body c1, so that the stiffness can be made uniform. Only the rigidity can be improved.

Instead of the above-described cross prepreg cp, a cord-like yarn prepreg in which carbon fibers are impregnated with a thermosetting resin may be formed in a braided shape and wound around the core c1. . According to this, similarly to the cross prepreg cp, the appearance of the connecting rod becomes mesh-like, and the appearance is favorably maintained.

Furthermore, while the connecting rod J1 has been described as being fixed to the large diameter rod pipe Ra, it is fixed to the small diameter rod pipe Rb.
The connecting rod J1 fixed to the small-diameter rod pipe Rb as described above may be configured to be inserted into the distal end of the large-diameter rod pipe Ra.

Next, a spigot fishing rod according to a second embodiment of the present invention will be described below with reference to FIG.

The spigot fishing rod B according to the second embodiment of the present invention also has a large-diameter rod pipe Ra, a small-diameter rod pipe Rb, and a splicing rod J2, similarly to the spigot fishing rod A according to the above-described first embodiment. , Except that the connecting rod J2 has a different vertical cross-sectional shape. Therefore, the same components are denoted by the same reference numerals, and description thereof will be omitted.

The connecting rod J2 comprises a core c2 and a reinforcing layer L2 integrally formed on the outer surface thereof.

The core c2 is made of the same material as the core c1 used in the first embodiment. The core c2 includes a solid central portion mp, a rear end portion rp integrally formed at the rear end, and a front end portion fp integrally formed at the front end. The rear end rp has a hole rpa inside thereof. The hole portion rpa is formed coaxially with the rear end portion rp, extends in the axial direction, and communicates with the end face of the rear end portion rp. On the other hand, the tip fp also has a hole fpb inside thereof. This hole f
pb is formed coaxially with the tip fp, extends in the axial direction, and communicates with the end face of the tip fp. By forming the holes rpa and fpb in this manner, the rigidity of each of the rear end portion rp and the distal end portion fp is made smaller than the rigidity of the intermediate portion mp.

The lengths and inner diameters of the holes rpa and fpb are large factors for reducing the rigidity at the rear end rp and the front end fp of the connecting rod J2.
The length is determined according to the length, outer diameter, and material used of the connecting rod J2, and the bending of the entire fishing rod required when the large-diameter rod pipe Ra and the small-diameter rod pipe Rb are joined. When the rigidity of the rear end portion rp and the distal end portion fp of the connecting rod J2 is reduced at a large reduction rate, the lengths and the inner diameters of the holes rpa and fpb are increased, while the rigidity is reduced at a small reduction rate. In this case, the lengths and inner diameters of the holes rpa and fpb are reduced. The method of forming the holes rpa and fpb is arbitrary, but, for example, the holes rpa and fpb are formed by subjecting both ends of a solid rod to reaming.

The reinforcing layer L2 is formed of the same material and by the same method as the reinforcing layer L1 used in the first embodiment described above, and the description thereof will be omitted.

According to the spigot fishing rod B according to the second embodiment of the present invention, the first fiber and the second fiber of the reinforcing layer L2 are used for the first fiber described above by the axial fiber of the core c2 and the first fiber and the second fiber of the reinforcing layer L2.
In addition to providing the same effect regarding rigidity as in the spigot fishing rod A according to the embodiment, concentration of stress at the connecting portion can be effectively avoided. That is, in a state where the small diameter rod pipe Rb is joined to the large diameter rod pipe Ra,
The rigidity of the rear end portion rp and the distal end portion fp of the connecting rod J2 is smaller than the rigidity of the central portion mp by forming the holes rpa and fpb. Part fp is a large diameter rod pipe Ra and a small diameter rod pipe Rb
Can be flexed following the flexure. That is, the large-diameter rod pipe R
In the connection portion between the a and the small-diameter rod Rb and the connecting rod J2, the rigidity is prevented from being extremely increased, and the concentration of stress at that portion can be avoided, and the fishing rod can be prevented from being damaged. Thus, when the large-diameter rod pipe Ra and the small-diameter rod pipe Rb are spliced, appropriate bending is obtained in the entire fishing rod.

In the second embodiment described above, the connecting rod J2 has been described as having a solid central portion mp. However, the rigidity of each of the rear end rp and the distal end fp of the connecting rod J2 is low. If the rigidity of the central portion mp is smaller than that of the central portion mp, holes (not shown) similar to the holes rpa and fpb at the rear end rp and the distal end fp are formed in the central portion mp. Or, in other words, the connecting rod J
The second core c2 may be formed in a hollow shape.

Next, a spigot fishing rod according to a third embodiment of the present invention will be described below with reference to FIG.

The spigot splice fishing rod C according to the third embodiment of the present invention, like the spigot spike fishing rod A according to the above-described first embodiment, includes a large-diameter rod pipe, a small-diameter rod pipe, and a connecting rod J3. It has the basic configuration, but the core c3 of the connecting rod J3
Is different from the reinforcing fiber in the reinforcing layer L3 in material, and two bias sheets (not shown) are used to form the reinforcing layer L3. It is the same as the fishing rod A. Therefore, in FIG. 5, the illustration of the large-diameter rod pipe and the small-diameter rod pipe is omitted, the description thereof is omitted, and only the connecting rod J3 will be described below.

The connecting rod J3 in the spigot connecting rod C
Is composed of a core c3 and a reinforcing layer L3 integrally formed on the outer surface thereof.

The core c3 is the core c1 shown in FIG.
Similarly to the above, it is formed in a substantially cylindrical shape from an axial fiber reinforced synthetic resin obtained by impregnating a thermosetting resin into an axial fiber oriented along the axial direction. As the directional fiber, not carbon fiber,
Glass fiber is used.

The reinforcing layer L3 is formed in a tubular shape from an inclined fiber reinforced synthetic resin so as to cover the entire outer surface of the core c3. In order to form this reinforcing layer L3,
Two bias sheets similar to the bias sheets bs1 and bs2 shown in FIGS. 2B and 2C, respectively, are used. The inclination angle of the first fiber and the second fiber as the inclined fiber in each bias sheet is maintained in the range of 20 to 70 degrees with respect to the axial direction of the core c3, as in the case of the first embodiment. And these first
Carbon fibers are used as the fibers and the second fibers.

As described above, by forming the axial fibers of the core c3 and the first and second fibers of the reinforcing layer L3 from different materials, the connecting rod J1 used in the first embodiment is different. A connecting rod J3 having characteristics can be obtained. That is, since the axial fibers of the core body c3 are glass fibers, the bending stiffness can be significantly reduced by this. On the other hand, the first fibers and the second fibers of the reinforcing layer L3 are carbon fibers. The torsional rigidity can be significantly improved. Of course, carbon fibers may be used as the axial fibers, and glass fibers may be used as the first and second fibers, contrary to the combination of the above-mentioned materials.

Next, a spigot fishing rod according to a fourth embodiment of the present invention will be described below with reference to FIG.

The spigot splice fishing rod D according to the fourth embodiment of the present invention, like the spigot spike fishing rod A according to the first embodiment, includes a large-diameter rod pipe, a small-diameter rod pipe, and a connecting rod J4. It has the basic configuration, but the core c4 of the connecting rod J4
Are different in material from the reinforcing fibers in the reinforcing layer L4, and a single cross prepreg (not shown) is used to form the reinforcing layer L4. It is the same as the fishing rod A. Therefore, in FIG. 5, the illustration of the large-diameter rod pipe and the small-diameter rod pipe is omitted, and the description thereof is omitted.
Only the connecting rod J4 will be described below.

The connecting rod J4 in the spigot fishing rod D
Is composed of a core c4 and a reinforcing layer L4 integrally formed on the outer surface thereof.

The core c4 is the core c1 shown in FIG.
Similarly to the above, it is formed in a substantially cylindrical shape from an axial fiber reinforced synthetic resin obtained by impregnating a thermosetting resin into an axial fiber oriented along the axial direction, As in the first embodiment, carbon fibers are used as the fibers.

The reinforcing layer L4 is formed in a tubular shape from an inclined fiber reinforced synthetic resin so as to cover the entire outer surface of the core c4. In order to form this reinforcing layer L4,
Although the same cross prepreg as in the first embodiment is used, the first fibers and the second fibers included in the cross prepreg are glass fibers, unlike the first embodiment. The inclination angle of the first fiber and the second fiber as the inclined fibers in the cross prepreg is maintained in the range of 20 to 70 degrees with respect to the axial direction of the core c4, as in the first embodiment. .

According to this structure, since the axial fibers are carbon fibers, the bending stiffness can be improved. On the other hand, the first fibers and the second fibers as the inclined fibers are glass fibers, so that the twisted fibers are twisted. Rigidity can be suppressed appropriately.

In the first, third and fourth embodiments described above, the cores c1, c3 and c4 have been described as being solid, but they may be hollow.

In the first, second and fourth embodiments described above, the first and second fibers are obtained by impregnating a thermosetting resin to form a reinforcing layer. Although the above description has been made on the assumption that the cross prepreg is used, a cross tape obtained by cutting the cross prepreg into a tape shape may be used.

[0055]

According to the spigot splicing fishing rod of the present invention, since the splicing rod is formed of the inclined fiber reinforced synthetic resin including the inclined fiber obliquely oriented with respect to the axial direction, The torsional rigidity of the rod tube is improved, and the accurate throwing of the device becomes possible, and the fish running around the right and left can be easily taken in. In addition, by appropriately reducing the rigidity against bending and crushing, it is possible to maintain the balance of rigidity against torsion, bending and crushing of the rod pipe, achieve proper bending, and break the rod pipe even if excessive stress is concentrated. Can be prevented.

In the spigot splicing rod according to the first aspect, as described in the second aspect, the inclined fiber is formed by the first fiber and the second fiber.
If the first fiber and the second fiber are oriented substantially symmetrically intersecting with respect to the axial direction of the connecting rod, the torsional rigidity is symmetrical on the left and right with respect to the center axis of the fishing rod. Thus, variation in rigidity in the fishing rod portion can be prevented, and the bending of the connecting rod during manufacture can be avoided.

In the spigot fishing rod according to claim 1 or 2, the connecting rod is oriented along the axial direction of the connecting rod and is made of a material different from the inclined fiber. An axial fiber reinforced synthetic resin containing fibers,
If it is composed of a composite with the inclined fiber reinforced synthetic resin, a spigot fishing rod having a wide variety of rigidities can be obtained.

In the spigot fishing rod according to any one of claims 1 to 3, if the connecting rod is cylindrical and solid as described in claim 4, the diameter of the fishing rod is increased to obtain a desired strength. It can be reduced, resulting in a fishing rod with a small outer diameter.

In the spigot splicing rod according to any one of claims 1 to 3, the splicing rod is formed in a columnar shape and extends at least at both ends in the axial direction of the splicing rod. By forming the holes, it is possible to prevent the rigidity of the joint between the large-diameter rod pipe and the small-diameter rod pipe from becoming excessively high, and to prevent damage to the rod pipe due to stress concentration. Further, in the connecting portion, a smooth tone is obtained, an appropriate bending degree of the rod is obtained, and the operability is improved. Further, processing for forming the hole is easy,
Moreover, the weight of the rod can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of a spigot type fishing rod according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a core body and a bias sheet used for manufacturing the spigot fishing rod of FIG. 1;

FIG. 3 is a partial longitudinal sectional view of a spigot type fishing rod according to a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a connecting rod in a spigot connecting fishing rod according to a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a connecting rod in a spigot connecting fishing rod according to a fourth embodiment of the present invention.

[Explanation of symbols]

 A A spigot fishing rod according to the first embodiment B A spigot fishing rod according to the second embodiment C A spigot fishing rod according to the third embodiment D A spigot fishing rod according to the fourth embodiment Ra Large diameter rod pipe Rb Small diameter rod pipe J1 , J2, J3, J4 Connecting rod f1 First fiber f2 Second fiber f3 Axial fiber rpa, fpb Hole

Claims (5)

[Claims] 1. A spigot fishing rod for connecting a large-diameter rod pipe and a small-diameter rod pipe via a connecting rod, wherein the connecting rod has a tilted fiber reinforcement including a tilted fiber oriented obliquely with respect to the axial direction thereof. A spigot fishing rod made of synthetic resin. 2. The inclined fiber is composed of a first fiber and a second fiber, and the first fiber and the second fiber are substantially symmetric with respect to the axial direction of the connecting rod. The spigot fishing rod according to claim 1, characterized in that it is oriented crosswise. 3. An axial fiber reinforced synthetic resin that is oriented along an axial direction of the connecting rod and includes an axial fiber made of a material different from the inclined fiber, and the inclined fiber reinforced synthetic resin. The spigot spliced fishing rod according to claim 1, comprising a composite with 4. The spigot fishing rod according to claim 1, wherein the fishing rod is cylindrical and solid. 5. The connecting rod is cylindrical, and
The spigot fishing rod according to any one of claims 1 to 3, wherein at least both ends thereof are formed with holes extending in the axial direction of the fishing rod.