JPH0984496A - Inwardly threaded fishing rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inwardly threaded fishing rod, capable of preventing the concentration of stress, smoothing the flexure of the fishing rod, and improving the balance of the flexure, and excellent in operability and handleability by gradually reducing the flexural rigidity in the longitudinal direction at the end part of a reinforcing part. SOLUTION: A hole 10H for the introduction of a fishing line 24 into a fishing rod pipe 10 is formed, and reinforcing parts 10A, 10B and 28 are formed in a rod pipe region around the hole 10H. The flexural elastic modulus of the rod pipe 10 is gradually decreased in the longitudinal direction at the reinforcing parts 10A, 10B and 28. Further, the hole 10H for the introduction of the fishing line is preferably formed at a place near the joint part of one fishing rod pipe 10, and the fishing rod pipe region around the hole is reinforced. A joint part is preferably formed so that the connection end of the other rod pipe 10 contacts with the reinforced part of the formed rod 10.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In a hollow fishing rod, a structure near the fishing line introducing portion for introducing the fishing line from the outside to the inside is disclosed in
100377, JP-A-4-248945,
It is disclosed in Japanese Utility Model Publication No. 1-178373. In the first and second publications, a hole for introducing a fishing line is formed in the thick portion of the rod pipe, and a frame body or a tubular frame body having the fishing line introducing hole is provided outside the hole. In the third publication, the fishing line introducing portion is arranged between the overlapping portions of both rod pipes of the joining portion of the front and rear rod pipes.

[0003]

However, in the first and second publications, the hole associated with the introduction of the fishing line is formed in the thick wall portion, and the rod pipe region near the hole is reinforced so that the other region is not reinforced. Bending rigidity is very large only in this area compared to
Even if a load is applied to the fishing rod, only this region is difficult to bend, so that the deflection is not smooth and the balance is poor, and stress concentration occurs at the end portion of the thick wall in the longitudinal direction, and the fishing rod is easily damaged. Further, in the third publication, since the fishing line introducing portion is formed while the front and rear rod pipes are overlapped with each other, the joint length becomes long and the region having high bending rigidity becomes long, so that a smooth flexure can be obtained. In addition, there is a problem that the balance of bending is poor and the strength is reduced due to the notch structure.
Furthermore, in the joint type through-fishing rod, the bending rigidity of each joint is high and the bending rigidity of the fishing line introducing portion is high, and there are many regions with high bending rigidity. Tend.

Therefore, an object of the present invention is to improve the bending balance of a fishing rod. Another object of the present invention is to improve the balance of flexure while preventing stress concentration on the hollow fishing rod due to reinforcement near the hole when the fishing line is introduced.

[0005]

In view of the above-mentioned object, the present invention according to claim 1 is characterized in that a hole for introducing a fishing line is formed in a rod pipe, and a reinforcing portion is formed in a rod pipe region around the hole, Provided is a hollow fishing rod characterized in that bending rigidity is gradually reduced in the longitudinal direction at the end of the portion. This reinforcement part means thickening reinforcement for crush resistance and buckling resistance, and brittle materials such as ceramics are not suitable for reinforcement materials, and ductility of metal, fiber reinforced resin, fiber reinforced metal, plastic, etc. Use wood. However, a general rubber material does not serve as a reinforcement. The same applies to claim 2. Claim 2
In, a splicing type continuous fishing rod that splices the front and rear rod pipes, forming a hole along with the introduction of the fishing line near the joint of one rod pipe, and reinforcing the rod pipe region around the hole, There is provided a hollow fishing rod, characterized in that the joint portion is configured so that the joint end portion of the other rod pipe is positioned and in contact with the portion.

According to the first aspect of the present invention, since the rod pipe region around the hole is reinforced, it is possible to prevent the rod peripheral region from being damaged when a load is applied to the fishing rod, and not only this but also the reinforcement portion. Since the bending rigidity is gradually reduced at the end, stress concentration at this part is prevented and it is hard to break,
The flexure is smooth and the flexure balance is good. In claim 2, since the hole associated with the introduction of the fishing line is formed near the joint, the reinforcing portion around the hole may also serve as a joint that needs reinforcement to maintain the joint strength. Therefore, when the fishing rod is viewed as a whole, the portion where the bending rigidity is extremely high is reduced, and thus the bending balance of the fishing rod can be improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments shown in the accompanying drawings. FIG. 1 shows an example of a swing-out type fishing rod according to the present invention, in which a middle rod 12 is spliced to a joint portion 10T of a tip portion of a base rod 10, and a tip rod 14 is further spliced to this. Top guide 1 at the tip
6 is attached to the rear end of the original rod 10
Is installed. Further, a reel leg fixing device 18 for fixing the reel 20 is mounted on the base rod 10, and a fishing line introducing portion 26 is provided in front of the reel leg fixing device 18.

FIG. 2 is an enlarged vertical sectional view of this portion. Referring to this, a hole 10H having a predetermined size is provided in the base rod 10, and ceramics, metal, etc. are provided around the hole 10H. A tubular frame body 28 made of, for example, plastic or fiber reinforced resin, to which the fishing line guide G1 formed of the above hard member is attached, is fixedly fitted. A fishing line guide G2 made of the same material is inserted and fixed in the hole 10H as shown in the drawing, and an upper portion thereof is formed as an opening 28H. There is no place other than the fishing line guide G1 and the fishing line guide G2 to contact when the fishing line 24 is under tension. The tubular frame 28 also serves as a member that reinforces the insufficient strength of the peripheral portion of the hole due to the hole 10H provided in the base rod 10. In addition,
An inner reinforcing layer 10A and an outer reinforcing layer 10B are provided on the inner circumference and the outer circumference of the base rod 10 as reinforcing members.

A tubular or sheet-shaped member can be used for these reinforcing layers. In particular, the tubular member can be used by being fitted onto the cored bar during molding, which is convenient as the inner reinforcing layer 10A. Examples of the member include a woven fabric of glass fiber, carbon fiber, or organic fiber (or a prepreg obtained by impregnating this with resin), a metal net, or the like. It is preferable to use a woven fabric because it is less likely to cause burrs and a crispy phenomenon during machining. Since the inner side has a smaller expansion / contraction rate when flexed, the inner side reinforcing layer can use fibers or the like having a higher elastic modulus than the outer side reinforcing layer. However, it is preferable to reinforce using a member having a lower elastic modulus than that of the main rod main body, because it is difficult to inhibit flexibility. In this way, the holes are made thicker, and the peripheral portions of the holes are reinforced by using a woven cloth or a net.

Although the tubular frame 28 is made of synthetic resin, it may be made of fiber reinforced resin. The fishing line 24
The height position of the fishing line guide G1 into which the fishing line is introduced from outside is formed high so that the fishing line 24 does not come into contact with the outer surface of the base rod.

By simply reinforcing the insufficient strength of the rod tube 10 due to the existence of the holes 10H, the flexural rigidity of this reinforcing region is increased, the flexed state of the fishing rod is not smooth, and so-called "b-shaped bending" occurs. In addition, stress concentration occurs where the rigidity changes abruptly. Therefore, supplementary auxiliary cylinders 30 are provided so as to be continuous with the longitudinal front and rear ends of the cylindrical frame 28. The auxiliary tubular body 30 is formed to have a thin wall thickness toward the end.
As the forming material, a synthetic resin softer than the tubular frame 28, a natural material such as rubber or wood, or a low elastic fiber reinforced resin is used, and the bending rigidity is made smaller than the end portion of the tubular frame 28 and the end It is gradually reduced in the direction of the part to prevent stress concentration and smooth the flexure.

In the structure in which only the hole 10H side (upper side in FIG. 2) of the rod tube is thickly reinforced, the auxiliary cylindrical body 30 may be replaced with only the upper side member. The inner reinforcing layer 10A and the outer reinforcing layer 10B are terminated by a distance L2 as shown in the figure, and the outer reinforcing layer 10B and the auxiliary tubular body 30 are separated by the distance L.
If the ends are separated by 1, the change in bending rigidity can be further moderated, stress concentration can be reduced, and bending can be smoothed.

FIG. 3 shows another embodiment, in which a pipe-shaped guide tube 32 is inserted into a hole 10H provided in the base rod 10. This pipe-shaped guide tube is held by a plate-shaped or semi-cylindrical frame body 28 ', and this frame body is fixed to the outer periphery of the base rod and the peripheral region of the hole 10H. The inner reinforcing member 3 is provided in the inner region around the hole 10H.
4 are fixedly arranged. In particular, the reinforcing body 34 reinforces the insufficient strength of the rod tube due to the existence of the hole 10H.
Although the guide tube 32 penetrates the reinforcing member obliquely, the guide tube 32 may be omitted. The diagonal rods for the guide rods of the base rod, the reinforcement body and the frame body are made of the frame body 2 made of synthetic resin or the like.
8'may be individually drilled after injection molding, but if holes are drilled together after adhering to the base rod 10, the size of the hole and the guide tube can be easily matched, and a smaller hole is required accordingly. , The strength is improved and the need for reinforcement is reduced.

The reinforcing body 34 can be formed of fiber reinforced resin, metal or the like, but in order to reduce the flexural rigidity of the fishing line introducing portion and make it easier to bend, it is formed of a material having a lower elastic modulus than the reinforcing fiber of the main rod body. Preferably. In the case of such reinforcement of the inside of the base rod, the base rod can be made slender and a fishing rod with a clean appearance can be provided. However, the hole 10 accompanying the introduction of the fishing line
Since it is necessary for H to pass through the guide tube 32 and the like, and it is necessary to pass fishing line through such a guide tube, there is a lower limit to the diameter dimension thereof. Therefore, when the inner diameter of the base rod 10 is very small, the strength may be extremely reduced by providing the hole 10H. Further, since the reinforcing body is arranged inside the main rod body, the expansion and contraction of the reinforcing body when bent is smaller than that of the main rod body. Therefore, even if a material having a higher elastic modulus than the reinforcing fiber of the main body is used for the reinforcing body 34 in the case of such a small diameter rod tube, the flexural rigidity is not extremely increased. Therefore, it is possible to strongly reinforce the reinforcing body 34 by using a material having a higher elastic modulus than the reinforcing fiber of the main rod main body, and by doing so, the reinforcing member may be removed on the outer side of the main rod having the relatively large hole 10H. Or, it can be reduced. Therefore, it is possible to make the fishing rod slim and form a fishing rod having a clean appearance.

The inner reinforcing member 34 may be hollowed as shown by 34H, and the reinforcing member is provided only on the side where the holes 10H are present (the upper side in FIG. 3) and the opposite side (lower side). May be lost. However, as described above, in order to prevent stress concentration and to obtain a smooth flexure, the auxiliary body 36 for reinforcement is continuously provided at the front and rear ends of the reinforcement body 34.
Is arranged, and the outer periphery is fixed to the inner surface of the original rod tube. As shown in the drawing, the thickness of the auxiliary body is gradually reduced toward the end. As the material, the same material as in the case of the first embodiment can be used so that the bending rigidity is smaller than that of the reinforcing body 34. Of course, the same applies to the first embodiment, but the rigidity may be reduced only by the shape such as the wall thickness of the reinforcing body. In addition, 10T 'is a joint for splicing, and the stepped portion DS is for inserting and positioning the auxiliary body 36 and the like. The inner reinforcing body 34 and the like are the original rod 10
It may be integrally formed with.

FIG. 4 shows a third embodiment near the fishing line introducing portion 26. A hole 10H having a predetermined size is formed in the base rod 10, and the periphery of this hole is reinforced by a high-strength tubular body 38 made of metal, fiber reinforced metal, or the like. The resistance of the fishing line may be reduced by coating a wear resistant material such as ceramics on the hole edge portion of the tubular body 38 or by fixing another member G2. The reinforcement width dimension L3 from the edge of the hole 10H is generally set to be equal to or larger than the inner diameter dimension of the base rod 10. Further, the bending rigidity is gradually reduced by the auxiliary cylinder 30 similar to that of the first embodiment,
Reduce stress concentration. The auxiliary tubular body 30 is a tubular body 38.
As shown in the figure, a stepped portion is provided and held and fixed so that the end portion of is pressed from the axial direction and the outside. This tubular body 38
Is a reinforcing portion, and is provided to prevent expansion and deformation of the hole 10H and prevent damage to the base rod 10 when a bending load is applied to the base rod 10. Therefore, it may be formed integrally with the original rod tube inside the original rod. If a spiral fishing line guide is formed on the inner surface of the base rod 10 and then a hole 10H is formed, the peripheral portion of the hole is reinforced from the inside by the spiral fishing line guide.

FIG. 5 shows an example of a form which replaces that of FIG. Original pole 10
Is formed by superposing the inner layer 10F and the outer layer 10E integrally with each other, but in the peripheral portion of the hole 10H for the fishing line guide G2, the peripheral portion of the hole is crushed in the shape shown in FIG. 6 between both layers. In order to prevent buckling or buckling, a reinforcing member 38 'such as a metal plate is provided, and further, both longitudinal end portions 3 thereof are provided.
8E 'is followed by a low elastic auxiliary member 30',
The auxiliary member 30 'is formed so that its thickness gradually decreases in the longitudinal direction. Therefore, the peripheral portion of the hole 10H can be reinforced, and stress concentration due to the reinforcement can be prevented. 10G is a portion formed by the same kind of fiber reinforced resin prepreg as the inner layer 10F and the outer layer 10E. The strip-shaped prepreg is arranged around the hole 38H of the reinforcing member 38 'to form the inner and outer layers 10G.
The holes 10H may be integrally formed with E and 10F, or a rectangular prepreg that fills the holes 38H may be provided, and the holes 10H that fill the fishing line guide G2 may be formed after being integrally formed with the inner and outer layers 10E and 10F.

As shown in FIG. 6, the thickness of the reinforcing member 38 'is gradually thinned toward both ends 38E in the circumferential direction, and the rigidity of the base rod 10 is prevented from changing suddenly in the circumferential direction. Has been done. As it goes to both ends 38E 'in the longitudinal direction, it may be gradually thinned similarly to both ends 38E in the circumferential direction, but as shown in FIG. It is preferable to dispose the auxiliary member 30 'and gradually reduce the thickness of the auxiliary member 30' in the longitudinal direction to prevent stress concentration. This is because if the end portion 38E 'of the hard reinforcing member 38' is sharper than the auxiliary member 30 ', the inner and outer layers are easily separated from each other.

FIG. 7 shows another embodiment of the present invention, which is a swing-out type middle fishing rod in which the fishing line introducing portion 26 is located near the tip of the base rod 10. That is, the hole 10H having a predetermined size is provided at the front position of the base rod, and the peripheral portion of the hole is the reinforcing portion 10K formed to be thick. A plate-like or semi-cylindrical frame 28 that is to be placed is fixedly mounted on this. The fishing line guides G1 and G2 are the same as in the case of the first embodiment, and 28H is a similar opening. As indicated by the chain double-dashed line 30 ', it is preferable to provide an auxiliary body for preventing stress concentration. In this embodiment, the joint portion 10T is in the range of the length LT, and the thick wall reinforcing portion 10 of the fishing line introducing portion 26 is included.
It extends to the K region. That is, the fishing line introducing portion 26 is positioned to the front.

When the middle rod 12 is spliced, the rear end of the splicing part reaches the position of the reinforcing portion 10K, and the outer periphery of the rear end contacts and presses the inner surface of the original rod. Since this portion is the reinforcing portion 10K, it is originally thick-walled and is suitable in terms of strength of the joint portion. However, the rear end position of the middle rod needs to be located before the hole 10H of the original rod. Otherwise, when a load such as a fish acts on the fishing rod, a strong push-up force acts from the rear end of the middle rod 12 on the original rod side in the joined region, and the hole edge portion is easily damaged. Is.
If the reinforcing portion 10K is made thicker by increasing the number of reinforcing fibers oriented in the circumferential direction as compared with the main rod main body behind the fishing line introducing portion, the flexibility is improved despite the increase in thickness. Further, if the high elastic reinforcing fibers in the axial direction of the reinforcing portion are reduced and the low elastic reinforcing fibers are increased, the flexibility is improved.

Tip T4 of joint 10T (length range L4)
Has a thick wall to prevent the tip from being frustrated (causing vertical splitting), but the rear part has a wall thickness of the main rod rod 10 behind the fishing line introducing portion 26. . This is because the pushing force acting on the joint portion under load is taken up by the reinforcing portion 10K as described above, and it is provided by the diameter expansion effect on the base rod when the middle rod 12 is inserted into the base rod 10 and joined together. The prevention is taken care of by increasing the thickness of the tip portion, and the strength is sufficient, so that the region between them is hardly increased in thickness in order to improve the flexibility. Also, thickening of the tip is to prevent tearing and fraying,
This is mainly done by arranging the reinforcing fibers oriented in the circumferential direction, and therefore the flexibility is good for the thick wall. As an example of the length of the joining portion, the length L4 of the leading portion is about 30 mm, and the remaining length L5 of the joining portion is about 30 to 130 mm.

An auxiliary pipe 12 'arranged at the rear end of the middle rod 12.
A fishing line guide G3 made of ceramics or the like is attached to the rear end, and the fishing line is introduced into the middle rod 12 through this fishing line guide. The outer circumference of the auxiliary pipe has a small diameter so as not to press the fishing line introducing portion. If the auxiliary pipe can be moved forward and backward with respect to the middle rod and can be held at that position, it is convenient to reduce the fishing line resistance when the fishing line is introduced.

FIG. 8 shows a cross section around the fishing line introducing portion of a side-by-side type hollow fishing rod. An auxiliary rod pipe 40 having a fishing line introducing portion 26 formed on the front portion of the base rod 10 with a diameter larger than that of the base rod 10 and having a thick wall.
Is fitted or screwed on the outer peripheral side. It may be integrally molded at the time of molding. The diameter of the auxiliary rod tube is larger than that of the main rod body, but as in the case of FIG. 7, the auxiliary rod tube has more reinforcing fibers oriented in the circumferential direction than the main rod body and the axial length. The flexibility is improved by decreasing the number of directional high elasticity reinforcing fibers and increasing the amount of low elasticity reinforcing fibers. The auxiliary rod pipe 40 is provided with a hole 40H of a predetermined size. However, since the auxiliary rod pipe 40 has a larger diameter than the original rod 10, even if the hole is formed large to reduce the yarn resistance, The strength is not reduced as compared with the case where a small hole is provided.

A fishing line guide G2 made of ceramics is arranged at the edge of the hole, and the auxiliary rod pipe 40 is reinforced while the reinforcing part 42 holds the fishing line guide G2 from the surroundings. That is, the reinforcing portion 42 can be formed of fiber reinforced resin prepreg or the like like the auxiliary rod tube, and reinforces the lack of strength on the side having the hole 40H (upper side in FIG. 8). This may also be integrally formed when the auxiliary rod tube is formed. Further, an auxiliary body may be provided to prevent stress concentration as shown in FIG. As shown, this reinforcement 4
The length range LT of the splicing part 40T is determined so that the rear end of the splicing part of the middle rod 12 is located in the region 2 and the reinforcing part 42 of the fishing line introducing part 26 is used as the splicing part as in the case of FIG. To use. Range L
T is located on the front side of the hole 40H as in the case of FIG. Although it is not clear in the figure, the ceramics fishing line guide G
The holding body 12E holding 4 has a slightly smaller outer diameter size that does not press the inner surface of the auxiliary rod tube 40.

By doing so, as in the case of the embodiment shown in FIG. 7, the total length of the splicing portion 40T and the fishing line introducing portion 26 can be shortened, the area where the bending rigidity becomes high can be reduced, and the deflection balance of the fishing rod can be reduced. improves. It also reduces costs.
The member 44 is a plug, and is for blocking the water that has entered the inside and draining it from the drain hole DH provided on the lower side of the auxiliary rod pipe 40. The front side shape of the plug body 44 is defined by a two-dot chain line 44 '.
And extending to a position below the front end of the fishing line guide G2, the shape of the holding body 12E is made to correspond to the front side shape of this plug body, and when the fishing line or the line threading tool is introduced, the fishing line is It is preferable that the guide is naturally guided by the guide G2, the plug body, and the holding body 12E so that the threading can be performed without visually observing the rear end of the middle rod.

FIG. 9 shows a cross section around the fishing line introducing portion of the reverse parallel splicing type middle fishing rod. A hole 10H is formed in the front portion of the base rod 10, and a pipe-shaped guide tube 32 is inserted into this hole. This pipe-shaped guide tube is held by a cylindrical frame 28, and this frame is the outer circumference of the base rod,
It is fixed and reinforced in the peripheral region of the hole 10H. An inner reinforcing body 34 is fixedly arranged in the inner region of the main rod around the hole 10H.
It reinforces the insufficient strength of the rod tube due to the presence of 0H. The guide pipe 32 obliquely penetrates the reinforcing body, and ceramic fishing line guides G1 and G2 are fixed to both ends thereof.

The material of the reinforcing body 34, the structure and material of the auxiliary body 36, and other effects are the same as in the embodiment of FIG. The joint portion 10T is formed by utilizing the reinforcement portion in the front region of the fishing line introducing portion thus reinforced, and the length range LT thereof is up to the front position of the hole 10H. That is, the inner diameter of the middle rod 12 'is configured so as to be fitted and inserted up to the range LT and joined together. In this way, it is possible to reduce the region where the bending rigidity as a whole becomes high and improve the flexural balance, but in order to further reduce the bending rigidity of the fishing line introducing portion 26,
If the guide pipe 32 is supported by a cushion member made of synthetic resin such as rubber or elastomer resin, the fishing line introducing portion 26 can be easily bent even if the guide pipe 32 has high bending rigidity.

Further, in the structure of supporting with such a cushion member, the guide tube can be attached and detached. Further, in order to attach / detach the guide tube, a screw may be used. If the annular member indicated by the chain double-dashed line 46 is fitted, it serves to determine the fitted insertion position of the middle rod 12 ′, and also serves to firmly fix the slanted guide tube 32 to the original rod 10. . In the embodiment shown in FIG. 9, both the bending balance due to the reinforcement portion of the fishing line introducing portion also serving as the joint portion and the stress relaxation at the end portion of the reinforcement portion are positively achieved.

In addition to the above-mentioned parallel joints and reverse parallel joints, the structure of the present invention can be applied to spigot joints. In the above example,
Although the hole is provided in the main rod 10 (or the auxiliary rod tube 40 fitted therein), the fishing line introducing portion may be formed by providing a hole in another rod tube such as the middle rod 12.

[0030]

As is apparent from the above description, according to claim 1 of the present invention, since the rod tube region around the hole is reinforced, the rod peripheral region is damaged when a load is applied to the fishing rod. Not only is it prevented from occurring, but the bending rigidity is gradually reduced at the end of this reinforcing part, so stress concentration on this part due to the load of the rod is prevented, the bending becomes smooth, and the bending balance is Get better. According to the present invention, since the hole associated with the introduction of the fishing line is formed near the joint, the reinforcing portion around the hole may also serve as the joint requiring strength to maintain the joint strength. Therefore, when the fishing rod is viewed as a whole, the portion where the bending rigidity is extremely high is reduced, and thus the bending balance of the fishing rod can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a hollow fishing rod according to a first embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of FIG.

FIG. 3 is a diagram of another example embodiment.

FIG. 4 is a diagram of yet another example embodiment.

5 is a diagram of another embodiment, which is an alternative to FIG.

FIG. 6 is a perspective view of the reinforcing component used in FIG.

FIG. 7 is a diagram of another example embodiment.

FIG. 8 is a diagram of another example embodiment.

FIG. 9 is a diagram of another example embodiment.

[Explanation of symbols]

 10 original rod 10A inner side reinforcement layer 10B outer side reinforcement layer 10H hole 10K reinforcement part 10T, 40T joint part 26 fishing line introduction part 30 auxiliary cylinder body 30 'auxiliary body 34 inner side reinforcement body 36 auxiliary body 38 tubular body for reinforcement

Claims (2)

[Claims] 1. A rod pipe is provided with a hole for introducing a fishing line, a reinforcing portion is formed in a rod pipe region around the hole, and bending rigidity is gradually reduced in the longitudinal direction at an end portion of the reinforcing portion. A characteristic fishing rod. 2. A splicing type intermediate fishing rod for splicing front and rear rod pipes, wherein a hole for introducing a fishing line is formed near the splicing part of one rod pipe, and the rod pipe region around the hole is reinforced. The middle fishing rod, wherein the joining portion is configured such that the joining end portion of the other rod pipe is positioned and in contact with the reinforcing portion.