JP2506474Y2 - Draw-out rod - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a swing rod, more specifically, a hollow cone-shaped hollow base rod, a tip, and a plurality of loose rods connecting the base rod and the tip. The present invention relates to a swing rod including a conical hollow intermediate rod and a buttocks.

(Prior Art) Generally, as shown in Japanese Utility Model Laid-Open No. Sho 60-94071, this type of drawing rod has a loose conical hollow base rod having a coupling inner surface at the tip and a proximal end. Having a tip with an inner surface, a tip with a binding outer surface at the base end, and a binding outer surface at the base end,
In addition, a plurality of loose conical hollow intermediate rods that have a connecting inner surface at the tip and connect the base rod and the tips, and an abutment plug provided at the base end of the base rod are provided to the fishing ground. When not in use, such as when carrying, the intermediate rods and tips are stored in the original rod, and when used at a fishing ground, the tips and intermediate rods are shaken out in sequence and the base end side The coupling outer surface is brought into contact with the coupling inner surface of the adjacent rod rods on the large diameter side to be coupled to each other, so that the coupling rods can be used with a constant length.

Further, conventionally, as seen in Japanese Utility Model Publication No. Sho 59-32274, in an oscillating rod composed of a plurality of intermediate rods of a rod and a tip and a butt plug, the rod and each of the intermediate rods. Of the rods, the large-diameter side intermediate rod is formed in the same diameter from the base end side to the distal end side without forming a gentle conical shape, and the tip end of each of these rod rods is tapered. The inner side of the reduced diameter portion is used as a joint inner surface, and the outer side of the reduced diameter portion is padded to form a joint surface that is in contact with the inner joint surface of the adjacent rod rod of the large diameter side, while the large diameter side intermediate The outer surface of the base end portion of the rod is padded, and a connecting outer surface that comes into contact with the inner peripheral surface of the rod rod on the large diameter side adjacent to the outer surface of these padding portions is provided, so that the length in use can be adjusted, and this It has been proposed to ensure that the adjusted length can be held.

(Problems to be solved by the invention) Among the problems described in the prior art, of the former, there is no problem when the tip and each of the intermediate rods are all shaken to the original rod and used in a certain length. However, for example, among the intermediate rods, stored in the original rod without shaking out the large-diameter side intermediate rod, and shake out the small-diameter side intermediate rod and the tip excluding the large-diameter side intermediate rod. When adjusting and using the total length, there is nothing that prevents the stored large diameter side intermediate rod from moving in the swinging direction, so when using this large diameter side intermediate rod moves in the swinging direction. Therefore, there is a problem that the adjusted length cannot be maintained.

Also, in the latter, the main rod and the large-diameter side rod are formed to have the same diameter except for both ends, and the outer surface of the base end of the large-diameter side intermediate rod is overlaid, so that the prepreg It is very difficult to remove the cored bar by a general manufacturing method in which the cored bar is wound around the cored bar and then the cored bar is removed to form a rod. Therefore, when manufactured by a general manufacturing method, there is a problem that the cost becomes high, and when the large-diameter-side intermediate rod is stored and shaken, the base end coupling outer surface of this large-diameter-side intermediate rod is ,
Since it comes into contact with the inner surface of the adjacent rod on the large diameter side over the entire moving range, the movement resistance of the intermediate rod on the large diameter side is very large, and it is difficult to carry out the storing and swinging operations. There was a problem that the inner surface of the large-diameter side rod was easily worn and scratched.

The present invention has been devised by appraising the above-mentioned conventional problems. The purpose is to adjust the length during fishing, and to maintain this adjusted length, and yet to use each rod in general. The intermediate rod can be easily stored and shaken out, and wear and scratches in the rod due to the storage and swing can be minimized. Is.

(Means for Solving the Problems) Accordingly, the present invention includes: a. A loose conical hollow base rod (1) having a coupling inner surface (11) at the tip, and b. A coupling outer surface at the base end. A tip (2) having (21), c. A coupling outer surface (31) at the base end and a coupling inner surface (32) at the tip, the rod rod (1) and the tip (2) A swing rod comprising a plurality of loose conical hollow intermediate rods (3) for coupling with each other and d. A buttocks plug (4) provided at the base end of the original rod (1), e. Of the intermediate rod (3), at least the outer surface on the distal end side of the intermediate rod (3) on the larger diameter side is padded so that the padding thickness gradually increases toward the tip end, and the padding portion (33 ) Is provided, and the fitting surface of a predetermined length that locks the movement in the length direction by contacting the inner surface (32) of the adjacent large-diameter-side rod with the outer surface of the built-up portion (33). (34) is the center line (in the longitudinal direction of the rod (1) ( X) and the guide surface (37) that is continuous with the mating surface (34) at the base end side.
A. An annular recess (36) is provided continuously with this guide surface (37), and i. It is in contact with the coupling inner surface (32) continuously with this recess (36) in the longitudinal direction. An auxiliary mating surface (35) of a predetermined length for locking the movement of the auxiliary rod is provided parallel to the longitudinal center line (X) of the rod rod (1), j. Is provided with a continuous guide surface (38) on the base end side thereof, and k. The base end of the intermediate rod (3) provided with the fitting surface (34) is fitted to the buttocks (4). The tip of the intermediate rod (3) provided with the surface (34) is locked at a position where it projects outward with respect to the adjacent large-diameter side rod, and l. The movement of the intermediate rod (3). The swinging rod is characterized in that it has a locking portion (41) for blocking.

(Operation) When the fishing rod is used with a short length during fishing, for example, among the intermediate rods (3), the large-diameter side intermediate rod is housed in the original rod (1), and the tip (2) And the small-diameter side intermediate rod are shaken out and used, and the stored large-diameter side intermediate rod is moved by the base end thereof being received by the engaging portion (41) of the butt plug (4). And the fitting surface (34) comes into contact with the inner connecting surface of the adjacent rods on the large diameter side to prevent movement in the longitudinal direction. It is possible to prevent the movement in the swinging direction and to maintain the adjusted length. Further, since the fitting surface (34) of the large-diameter side intermediate rod has a predetermined length that contacts the inner surface of the coupling and locks the movement in the longitudinal direction, there is some dimensional error. Also, it is possible to prevent the intermediate rod provided with the fitting surface (34) from moving in the swinging direction during storage, and the fitting surface (3
Since the continuous guide surface (37) is provided in 4), the intermediate rod can be stored smoothly and comfortably.
It is possible to reduce scratches on the tip end portion of the adjacent rod rod on the large diameter side and the overlay portion. Further, since the base rod (1) and each of the intermediate rods (3) have a gentle conical shape, they can be manufactured by the general manufacturing method described above, and at the same time, the tapered surface of the gentle cone is used. Since the rods can be joined at the time of swinging out, it is possible to easily store and swing out the intermediate rods (3) and to minimize wear and scratches on the inner surface of the large-diameter rods due to the storing and swinging out. Of.

On the other hand, since the intermediate rod rod locked to the locking portion (41) of the butt plug (4) is configured such that the tip portion thereof is projected outward with respect to the adjacent large diameter side rod, It is easy to pull out the stored intermediate rod.

Further, when the build-up portion is formed of a paint layer and the fitting surface (34) is formed on the outer surface of the build-up portion, the build-up portion and the fitting surface can be easily and easily formed. If the auxiliary fitting surface (35) is provided, this auxiliary fitting surface (35)
As a result, the stability of the stored intermediate rod (3) with respect to the adjacent large-diameter rod can be further improved, the rattling can be further reduced, and the holding can be more firmly held. For example, at the time of fishing for sweetfish, the original rod (1)
If you want to replace the decoy ayu while holding the, you can lightly lock the movement of the intermediate rod (3) with the auxiliary mating surface (35).
The intermediate rod (3) can be stored and shaken out easily and easily.

(Example) In the figure, (1) is a hollow cone-shaped hollow rod having a coupling inner surface (11) at its tip, (2) is a tip having a coupling outer surface (21) at its base, ( 3) is a coupling outer surface (31) at the base end
In addition, a plurality of loose conical hollow intermediate rods (4) having a connecting inner surface (32) at the tip portion and connecting the base rod (1) and the tip (2) with different diameters are provided. A butt plug to be attached to the base end of the original rod (1).

Further, the intermediate rod (3) and the tip (2) can be stored and shaken out with respect to the original rod (1). Then, when stored, each intermediate rod (3) and tip (2)
Comes into contact with the butt plug (4) and is prevented from moving in the storing direction, and, at the time of swinging out, the connecting outer surface (31) of the thickest intermediate rod rod.
Is on the inner joint surface (11) of the base rod (1), on the inner joint surface (32) of the intermediate rod on the large diameter side to which the outer joint surface (31) of the other intermediate rod is adjacent, and on the tip (2). ), The outer joint surface (21) of each of them contacts the inner joint surface (32) of the smallest diameter intermediate rod and is joined,
The drawing length is retained.

The base rod (1) and each intermediate rod (3) are manufactured by a general manufacturing method using a prepreg. That is,
A sheet-shaped prepreg in which high-strength fibers are impregnated with synthetic resin is wrapped around the outer circumference of a loose-cone cored bar, and cellophane tape is wound around the outer periphery in a spiral shape to bind the prepreg. Pressing and heating in a heating furnace in this pressurized state, the synthetic resin in the winding prepreg is cured by this heating, then the cored bar is removed and the cellophane tape is peeled off, and the main rod (1) And each intermediate rod (3) is formed. The tip (2) is also manufactured by a general manufacturing method.

Therefore, in the embodiment shown in FIGS. 1 to 3, five intermediate rods (3) are used, and among these intermediate rods (3),
Except for the thinnest intermediate rod (3e), the four outer diameter rods (3a) (3b) (3c) (3d) on the large diameter side have the outer surface of the tip part, and the buildup thickness increases in order toward the tip side. Each padding (33) is made thicker, and the outer surfaces of these padding portions (33) are brought into contact with the connecting inner surfaces (11) (32) of the adjacent rod rods on the large diameter side to move in the longitudinal direction. A fitting surface (34) of a predetermined length to be locked is provided in parallel with the center line (X) in the length direction of the rod so that even if the position in the length direction is slightly changed due to a processing error, each of the fitting surfaces While ensuring that the (34) can be brought into contact with the respective coupling inner surfaces (11) (32), and providing a continuous guide surface (37) on the base end side of the fitting surface (34), The base end of each of the intermediate rods (3a) to (3d) provided with the fitting surface (34) on the butt plug (4) is connected to the intermediate rod (3a) provided with the fitting surface (34). ) ~
A conical locking part (3d) is locked at a position where the tip end portion of the large-diameter-side rod adjacent to it protrudes outward, and prevents movement of the intermediate rod in the storage direction and the radial direction ( 41) was established.

In the above structure, each of the built-up portions (33) is formed by applying a thick coating material to the outer surface of the tip end portion of each of the intermediate rods (3a) to (3d) manufactured by a general manufacturing method. is there. And
After the outer surface of the built-up portion (33) is polished by this application, finish coating is performed to form the fitting surface (34). The padding portion (34) may be formed integrally with the intermediate rods (3a) to (3d) at the time of manufacturing the intermediate rods (3a) to (3d). That is, a thin prepreg similar to the prepreg to be formed in a wide width may be formed on the outside of one end of the wide prepreg and wound around the core metal, and may be integrally formed by pressure firing as a conventional method, By being integrally formed in this way, the built-up portion (34)
Can be reliably prevented from coming off. In this case, the outer surface of the built-up portion (33) is ground and coated to form the fitting surface (34).

The fitting surface (34) is formed to have a length of about 2 to 10 mm, preferably about 5 to 10 mm. That is, the base rod (1) and the intermediate rod (3) are manufactured by winding the prepreg around the core metal as described above, and then cutting both ends to form a predetermined length. Since the base rod (1) and the intermediate rods (3) have a gentle conical shape over the entire length, the positional relationship between the adjacent rods is deviated depending on the cutting position, and there is no influence due to this deviance. In order to achieve this, it is preferable to form the above-mentioned length. The fitting surface (34) is the inner surface (1) of the adjacent large-diameter rod rod.
1) The diameter is formed to be the same as or slightly larger than the minimum diameter portion of (32). It is preferable that the fitting surface (34) is provided in parallel with the center line (X), but in addition, as shown in FIG. 2, the fitting surface (34) is provided in parallel with the center line (X). The front end side of the mating surface (34) may be gradually thinned, or may be a curved surface that curves outward in the radial direction.

In addition, each intermediate rod (3a) to which the fitting surface (34) is provided.
On the outer surface of the tip of (3d), the mating surface (3
On the base end side of the rod with respect to 4), an auxiliary mating surface (35) having the same diameter as each mating surface (34) at a predetermined interval from each mating surface (34).
It is preferable that each of them is provided by padding. By doing so, each intermediate rod (3a) provided with the fitting surface (34).
When storing (3d) and shortening the overall length for use, the fitting surface (34) and auxiliary fitting surface (35) of the stored intermediate rod (3)
Since it is possible to make contact with the connecting inner surface (11) or (32) of the adjacent rod rods on the large diameter side, the intermediate rod rod (3) stored
The stability of the rods against the adjacent large diameter rods can be further improved, and it is possible to further reduce rattling. Also, when fishing with a reduced length, the stored intermediate rods (3) The auxiliary fitting surface (35) comes into contact with the coupling inner surface (11) or (32) to prevent further movement of the intermediate rod (3) even when the intermediate rod (3) moves in the swinging direction. The intermediate rod (3) can be held in the stored state, and the intermediate rod (3) can be securely held in the unused state.

In this case, each of the built-up portions (33) is connected to each of the fitting surfaces (3
4) Formed from the formation position to the base end side position of the rod,
An annular recess (36) is formed in the middle of the buildup portion (33) in the longitudinal direction.
Are formed by cutting or the like to form the fitting surface (34) on the outer surface of the front buildup portion and the auxiliary fitting surface (35) on the outer surface of the base buildup portion.
And a guide surface (38) continuous to the base end side of the auxiliary fitting surface (35). Of course, the build-up portion for providing the auxiliary fitting surface (35) may be formed separately from the build-up portion (33). Further, it is preferable that the auxiliary fitting surface (35) is provided within a range of 50 mm from the tip edge of each intermediate rod (3). Further, it is preferable that the auxiliary fitting surface (35) is provided parallel to the center line (X), but it may be a curved surface which is curved outward in the radial direction.

Further, the locking portion (41) of the buttocks (4) is preferably formed in a conical shape as shown in the figure, but it may be formed in other shapes, for example, in a podium shape. Further, the butt plug (4) is formed of a soft material such as rubber, but the material is not particularly limited.

The present invention is configured as described above, and when the tip (2) and each intermediate rod (3) are shaken out during fishing, it can be used at the longest length. In this case, as in the case of a general conventional swing-out rod, the connecting outer surface (31) of the thickest diameter intermediate rod (3a) is connected to the connecting inner surface (11) of the original rod (1), and another intermediate rod. The outer coupling surface (31) of (3b) to (3e) is adjacent to the inner coupling surface (32) of the large-diameter side intermediate rod, and the outer coupling surface (21) of the tip (2) is the thinnest intermediate rod (). 3e) can be held in contact with the inner joint surface (32) and joined together to maintain the splay length.

Further, when the fishing rod is used with a short length during fishing, for example, as shown in FIG. 3, of the intermediate rods (3), two large-diameter side intermediate rods (3a) (3b) are used as the base rod. The tip (2) and the three rod rods on the small diameter side (3c) to (3e) are housed in the rod (1) and shaken out for use. In this case, the stored intermediate rods (3a) (3b) have the base end of the locking portion (41) of the buttocks (4).
It is received by the rod and is prevented from moving in the storage direction and the radial direction, and the fitting surface (34) of the intermediate rod (3a) and the coupling inner surface (11) of the original rod (1) and the intermediate rod. The fitting surface (34) of the rod (3b) is brought into contact with the joint inner surface (32) of the thickest intermediate rod rod (3a) to prevent movement in the swinging direction. Therefore, when fishing with the adjusted length, the stored intermediate rods (3a, 3b) can be prevented from moving in the swinging direction, and the adjusted length can be maintained.
Also, when adjusting the length during use, the intermediate rod (3)
It is possible to adjust the length to an arbitrary value by selecting the number of storages, and the adjusted state can be maintained as described above.
Further, the intermediate rods (3a) (3b) have the fitting surface (3
Since the continuous guide surface (37) is provided on the base end side of 4), the intermediate rods (3a) (3b) can be smoothly and comfortably accommodated by the guide surface (37) and adjacent to each other. It is possible to reduce scratches on the tip end of the large-diameter side rod and the build-up portion. Further, the intermediate rods (3a) (3b) locked to the locking part (41) of the butt plug (4) are As shown in FIG. 3, the tip portion thereof projects outwardly with respect to the adjacent rod rod on the large diameter side, so that the stored intermediate rod rods (3a) (3b) can be easily pulled out.

When the fitting surface (34) is provided only on the large-diameter intermediate rod (3a), the fitting surface (34) is located closer to the base end than the central portion in the longitudinal direction of the large-diameter intermediate rod (3a). It may be provided on the outer surface of the tip side including the portion, preferably on the outer surface of the central portion in the longitudinal direction. In this case, the length of the original rod (1) is changed to the intermediate rod (3) as shown in FIG.
While being formed shorter than the length of the above, the large-diameter intermediate rod (3a)
In the vicinity of the fitting surface (34) and at the base end side with respect to the fitting surface (34), the auxiliary fitting surface (35) is provided to form a swing rod for ayu fishing. Good. That is, when performing ayu fishing, generally, when exchanging a decoy while holding the rod end of the original rod (1) or when putting a hanging ayu into a tugboat or the like, a large diameter intermediate rod (3a ) Is stored in the original rod (1) to shorten the overall length, and when making a decoy ayu to swim, the middle rod (3a) with a large diameter is shaken out to increase the overall length. Since the intermediate rod (3a) can be stored and shaken out frequently, it is preferable to configure it as shown in FIG.

Then, when performing ayu fishing, a large diameter intermediate rod (3a)
If the total length is shortened by housing the inside of the rod (1), the auxiliary fitting surface (35) provided on the base end side with respect to the fitting surface (34).
Can be lightly contacted with the coupling inner surface (11) of the original rod (1) to lightly lock the movement of the large-diameter intermediate rod (3a), so that the large-diameter intermediate rod (3a) can be extended. The operation can be performed very easily and easily. Therefore, even if the large-diameter intermediate rod (3a) is stored and shaken out frequently, the fatigue caused by this operation can be reduced. Even if the large-diameter intermediate rod (3a) is stored and shaken out frequently, it is possible to further reduce the abrasion and scratches on the inner surface of the original rod (1) due to the storing and shaking. Further, when storing the swung-out intermediate rod (3) and the tip (2), such as when changing the fishing ground, the fitting surface (34) of the large-diameter intermediate rod (3a) is attached to the original rod. It is fitted to the coupling inner surface (11) of (1), and the large diameter intermediate rod (3
Lock the base end of a) to the locking part (41) of the buttocks (4),
It is possible to firmly prevent the movement of the large diameter intermediate rod (3a).

In the embodiment described above, the five intermediate rods (3)
Among these intermediate rods, four large diameter intermediate rods (3a) to (3d) are provided with fitting surfaces (34), respectively. The intermediate rods provided with these fitting surfaces (34) Is not particularly limited. Moreover, since it is considered that the tip (2) is not used in a length in which only the tip (2) is shaken out, it is preferable not to provide the fitting surface (34) on the smallest diameter intermediate rod (3e). Further, the total number of the intermediate rods (3) is not particularly limited.

The butt plug (4) has a closing part (4a) having a locking part (41) as shown in FIG. 1, and the closing part (4a) is attached to the outer surface of the rod butt of the rod rod (1). In addition to forming with the tubular mounting portion (4b), as shown in FIG. 4, the closing portion (4a) and the tubular mounting portion (4b)
And an inner ring (4c), and the inner ring (4c) and the rod rod inner surface of the original rod (1) are fixed to each other, and the inner surface of the inner ring (4c) serves as the locking portion (41). The outer surface of the base end portion of the large-diameter intermediate rod (3a) may be brought into contact with the locking portion of the inner surface of the inner ring (4c) to prevent the movement of the large-diameter intermediate rod (3a). In this case, the large diameter intermediate rod (3
Providing a locking portion that comes into contact with the inner surface of the base end of a), the movement of the large-diameter intermediate rod (3a) is prevented by both the locking portion of this closing portion and the locking portion of the inner surface of the inner ring. It is preferable to do so.

(Effects of the Invention) As described above, according to the present invention, when the fishing rod is used by shortening the length during fishing, for example, among the intermediate rods (3), the large-diameter side intermediate rod is the original rod ( 1) It is housed in the inside, and the tip (2) and the narrow diameter side intermediate rod are shaken out and used, and the stored large diameter side intermediate rod has a butt plug (4) at its base end. The movement is blocked by being received by the stop portion (41), and the fitting surface (34) comes into contact with the coupling inner surface of the adjacent rod rod on the large diameter side to prevent movement in the longitudinal direction. During fishing, the stored intermediate rod can be prevented from moving in the swinging direction, and the adjusted length can be maintained.

Moreover, since the fitting surface (34) of the large-diameter-side intermediate rod has a predetermined length that contacts the inner surface of the coupling and locks the movement in the longitudinal direction, there is some dimensional error. Also, it is possible to prevent movement of the intermediate rod provided with this fitting surface (34) in the swinging direction during storage, which can increase the yield accordingly and reduce the cost, and the fitting surface ( Since the continuous guide surface (37) is provided in 34), the intermediate rod can be stored smoothly and comfortably, and the tip of the adjacent rod rod on the large diameter side and the buildup portion are not scratched. It can be reduced.

In addition, since the base rod (1) and each intermediate rod (3) are of a conical shape, they can be easily manufactured by a general manufacturing method, and the cost can be further reduced. Since the rod rods can be joined at the time of swinging out by using the taper surface of the loose cone shape, it is possible to easily store and swing out the intermediate rod rods (3), and also the rod rods on the large diameter side by the storing and swinging out. The wear and scratches on the inner surface can be minimized.

On the other hand, since the intermediate rod rod locked to the locking portion (41) of the butt plug (4) is configured such that the tip portion thereof is projected outward with respect to the adjacent large diameter side rod, It is easy to pull out the stored intermediate rod.

Further, when the build-up portion is formed of a paint layer and the fitting surface (34) is formed on the outer surface of the build-up portion, the build-up portion and the fitting surface can be easily and easily formed. If the auxiliary fitting surface (35) is provided, this auxiliary fitting surface (35)
As a result, the stability of the stored intermediate rod (3) with respect to the adjacent large-diameter rod can be further improved, the rattling can be further reduced, and the holding can be more firmly held. For example, at the time of fishing for sweetfish, the original rod (1)
If you want to replace the decoy ayu while holding the, you can lightly lock the movement of the intermediate rod (3) with the auxiliary mating surface (35).
The intermediate rod (3) can be stored and shaken out easily and easily.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway side view showing an embodiment of the drawing rod of the present invention, FIG. 2 is a partially enlarged sectional view, and FIG. 3 is an explanatory view of a state in which the length is adjusted, FIG. 4 is a partially cutaway side view showing another embodiment. (1) …… Gon rod (11) …… Inner surface of coupling (2) …… Tip (21) …… Outer surface of coupling (3) …… Intermediate rod (31) …… Outer surface of coupling (32) …… Inner surface of coupling (34) …… Mating surface (35) …… Auxiliary mating surface (37) …… Guide surface (4) …… Bottom plug (41) …… Locking part

Claims (1)

(57) [Scope of utility model registration request] Claims: 1. a. A loose cone-shaped hollow base rod (1) having a joint inner surface (11) at the tip, and b. A tip (2) having a joint outer surface (21) at the base. , C. A plurality of loose conical hollows that have a coupling outer surface (31) at the base end and a coupling inner surface (32) at the tip and that couple the main rod (1) and the tip (2). A swinging rod comprising an intermediate rod (3) and d. A buttocks plug (4) provided at the base end of the original rod (1), e. The outer surface on the tip side of the intermediate rod (3) on the radial side is built up so that the buildup thickness gradually increases toward the tip side to provide a buildup portion (33). F. 33) On the outer surface, a fitting surface (34) of a predetermined length is provided, which comes into contact with the coupling inner surface (32) of the adjacent rod rods on the large diameter side and locks the movement in the length direction of the rod rod (1). Parallel to the longitudinal centerline (X) of the g. This mating surface (34) Guide surface continuous with the base end (37)
A. An annular recess (36) is provided continuously with this guide surface (37), and i. It is in contact with the coupling inner surface (32) continuously with this recess (36) in the longitudinal direction. An auxiliary mating surface (35) of a predetermined length for locking the movement of the auxiliary rod is provided parallel to the longitudinal center line (X) of the rod rod (1), j. Is provided with a continuous guide surface (38) on the base end side thereof, and k. The base end of the intermediate rod (3) provided with the fitting surface (34) is fitted to the buttocks (4). The tip of the intermediate rod (3) provided with the surface (34) is locked at a position where it projects outward with respect to the adjacent large-diameter side rod, and l. The movement of the intermediate rod (3). A swing rod having a locking portion (41) for preventing the m.