JP7176995B2 - Draw-out fishing rod - Google Patents

Description

The present invention relates to the structure of a so-called swing-out fishing rod.

A so-called swing-out fishing rod or ball handle (hereinafter referred to as a "swing-out rod") consists of a plurality of rod tubes, each of which is assembled to form a telescopic structure. Each rod is generally made of resin reinforced with carbon fiber, and among the plurality of rods, the one with the smallest outer diameter is called the first rod and the second, with the rod having the largest outer diameter. The pipe is called a base pipe. The base pipe is the part that the fisherman grips when operating the draw rod, and the rod pipe arranged inside the base pipe is called the base pipe. The inner diameter of the tip of the large-diameter rod among the adjacent rods is set to be smaller than the outer diameter of the rear end of the small-diameter rod, and when the drawn-out rod extends, the adjacent rods fit together. Together, the extended state of the drawing rod is maintained. However, when the draw-out rod is shortened, it is required that the fitting of each rod tube be easily released.

By the way, when the drawn rod is extended in actual fishing, the adjacent rod pipes are pulled relatively strongly in the axial direction, and there is a risk that they will be tightly fitted and fixed. On the other hand, in the case of a draw-out rod, if the fitting between adjacent pipes is weak, the adjacent pipes may rotate relative to each other in the axial direction, or the draw-out rod may be shortened unintentionally by the angler (each pipe may be shortened). may fall off). Various countermeasures have been taken in the past to eliminate such inconveniences (see, for example, Patent Documents 1 and 2).

In the ball handle disclosed in Patent Document 1, a ball or a metal member is arranged at the rear end portion of the base rod pipe and the tip portion of the base rod pipe, respectively, and the base rod pipe and the base rod pipe are arranged. In order to prevent sticking, a groove is provided on the inside of the tip of the base pipe to reduce the contact area with the base pipe. This realizes smooth sliding of the upper base pipe with respect to the base pipe.

In the ball handle disclosed in Patent Document 2, the diameter of the inside of the tip of the base pipe is reduced to form a stepped portion in order to prevent the base pipe and the base pipe from sticking together. The rear end portion of the upper rod tube is enlarged in diameter, and the rear end portion and the stepped portion are in contact with each other. Furthermore, in order to prevent relative rotation of the main upper rod pipe with respect to the main rod pipe, a locking groove is formed in the rear end portion of the main upper rod pipe, and the locking groove is formed inside the tip portion of the base rod pipe. An engaging locking projection is provided. The outer diameter of the rear end of the base rod and the inner diameter of the tip of the base rod can be easily disengaged when the base rod is extended from the base rod and fitted. Precise dimensional settings are made so that it is not

Japanese Patent No. 3860757 Japanese Patent Application Laid-Open No. 2003-174835

In the structures disclosed in each of the patent documents, the fitting state between adjacent rod pipes is determined when one of them is completely extended with respect to the other. In other words, each rod pipe slides smoothly, but the adjacent rod pipes do not engage with each other until they are fully extended.

In actual fishing, there is a demand for anglers to feel the degree of engagement between adjacent rod pipes when extending a fishing rod. That is, when an angler pulls out one of the adjacent rod pipes from the other, he wants to feel the process of fitting the rear end of one rod pipe into the tip of the other rod pipe. There is a demand for a feeling that the pull-out resistance of the rod tube gradually increases and the fitting state is gradually formed. If the fisherman can obtain such a feeling, the operational feeling when extending the fishing rod will be improved, and the operation of extending the fishing rod can be performed without worrying that the rod pipes will not stick to each other.

However, with the structures disclosed in each of the patent documents, the angler cannot feel that the pull-out resistance of one of the rod pipes gradually increases. Moreover, since the adjacent rod pipes have a complicated fitting structure, the processing cost of each rod pipe and the manufacturing cost of the fishing rod increase.

SUMMARY OF THE INVENTION The present invention has been made under such circumstances, and its object is to enable each rod pipe to be extended with peace of mind while providing a high-class feeling of operation, and to achieve a good fit preventing the rod pipes from sticking together. To provide a swinging rod capable of achieving a combined state at a low cost.

(1) A swing-out fishing rod according to the present invention is a swing-out fishing rod constructed such that a small-diameter rod tube is pulled out from a large-diameter rod tube and both are joined at a predetermined position. The small-diameter rod tube has a first enlarged-diameter portion whose outer diameter gradually expands toward the large-diameter rod-pipe side at a first diameter expansion rate, and further from the first enlarged-diameter portion toward the large-diameter rod-pipe side. A second diameter-expansion portion extending toward the large-diameter rod tube side is provided, the outer diameter of which gradually expands at a second diameter-expansion rate different from the first diameter-expansion rate.

According to this invention, when the small-diameter rod is pulled out from the large-diameter rod, the first expanded-diameter portion and the second expanded-diameter portion are fitted inside the large-diameter rod and joined together. The second enlarged diameter portion extends from the first enlarged diameter portion and extends toward the large diameter rod tube. The outer diameters of the first enlarged diameter portion and the second enlarged diameter portion are gradually enlarged toward the large diameter rod tube side. Therefore, the second enlarged diameter portion presents a funnel shape extending radially outward continuously from the first enlarged diameter portion. Therefore, in the process of fitting the first enlarged diameter portion and the second enlarged diameter portion to the inside of the large diameter rod pipe, the second enlarged diameter portion is relatively compressed by the large diameter rod pipe and elastically deformed in the radial direction. .

That is, in conjunction with the action of the fisherman pulling out the small-diameter rod from the large-diameter rod among the adjacent rods, the first expanded-diameter portion is fitted to the large-diameter rod, and the second enlarged-diameter portion is fitted to the large-diameter rod in accordance with the amount of withdrawal. The enlarged diameter portion is elastically deformed and more strongly fitted to the large diameter rod pipe. Since the second enlarged diameter portion is fitted to the large-diameter rod by elastic deformation as described above, when the fisherman pushes the small-diameter rod into the large-diameter rod, i.e., the large-diameter rod, When it is slid in the direction of insertion, the fitting between the second enlarged diameter portion and the large diameter rod pipe is easily released, and subsequently the fitting between the first enlarged diameter portion and the large diameter rod pipe is easily performed. is released at

(2) It is preferable that the second diameter expansion rate is set larger than the first diameter expansion rate.

In this configuration, the second enlarged diameter portion protrudes radially outward. Therefore, there is an advantage that when the fisherman pulls out the small diameter rod pipe from the large diameter rod pipe, it is easy to sense the fitting state between the second enlarged diameter portion and the large diameter rod pipe.

(3) It is preferable that the second diameter expansion rate gradually increases toward the large-diameter rod tube side.

In this configuration, the outer ridgeline of the second enlarged diameter portion broadens in a curved shape toward the large-diameter rod tube side. Therefore, the fitting force between the second expanded diameter portion and the large-diameter rod pipe increases more gently with respect to the amount of withdrawal of the small-diameter rod pipe, so that the angler's operability of the small-diameter rod pipe is improved.

(4) The first enlarged diameter portion has a first rigidity in the radial direction, and the second enlarged diameter portion has a second rigidity in the radial direction. Preferably, the first stiffness and the second stiffness are different from each other. In particular, the second stiffness is more preferably set smaller than the first stiffness.

With this configuration, when the fisherman pulls out the small-diameter rod from the large-diameter rod, the second enlarged-diameter portion is more easily deformed, further improving the operational feel of the small-diameter rod.

(5) The small-diameter rod tube is made of fiber-reinforced resin, the fibers of the first enlarged diameter portion are aligned in a predetermined first fiber direction, and the fibers of the second enlarged diameter portion are different from the first fiber direction. It is preferable that the fibers are aligned in the second fiber direction. In particular, it is preferable that the first fiber direction includes at least the circumferential direction of the small-diameter rod tube, and the second fiber direction is a direction crossing the first fiber direction.

In this configuration, since the small-diameter rod is made of fiber-reinforced resin, the second enlarged-diameter portion is prevented from buckling in the circumferential direction when the second enlarged-diameter portion and the large-diameter rod are fitted together. be done. In addition, since the direction of the fibers included in the first enlarged diameter portion intersects the direction of the fibers included in the second enlarged diameter portion, there is a difference in elastic deformation between the first enlarged diameter portion and the second enlarged diameter portion. can be provided, and the mutual fitting state can be felt while pulling the adjacent small-diameter rod pipe and large-diameter rod pipe relatively. Moreover, since the fibers contained in the second enlarged diameter portion are aligned in a direction intersecting the circumferential direction, the second enlarged diameter portion is more easily deformed. You can make a difference.

(6) The small-diameter rod pipe is preferably made of carbon fiber reinforced resin.

With this configuration, the elastic deformation of the small-diameter rod tube can be adjusted relatively freely depending on the fiber direction. Moreover, the use of carbon fiber as the reinforcing fiber facilitates strength design that realizes weight reduction of the small-diameter rod pipe.

(7) The second enlarged diameter portion is preferably made of nonwoven fabric impregnated with resin. In particular, it is more preferable to impregnate a nonwoven fabric made of fibers having an elastic modulus of 1000 kgf/mm2 or less with a resin.

With this configuration, the second enlarged diameter portion is more easily deformed, and the feeling of operation of the small-diameter rod tube is further improved for the fisherman.

According to this invention, when the small-diameter rod is pulled out from the large-diameter rod, the second expanded diameter portion of the small-diameter rod is elastically deformed according to the amount of pull-out and fits into the large-diameter rod. When the fishing rod is extended, the adjacent small diameter rod pipe and large diameter rod pipe can be pulled relatively and the mutual fitting state can be recognized by feeling, and high-grade operability is realized. Moreover, the elastic deformation of the second enlarged diameter portion securely fits and holds the adjacent rod pipes, thereby preventing the rod pipes from coming off during actual fishing. Furthermore, since the second enlarged diameter portion is elastically deformed, the fitting between the small-diameter rod tube and the large-diameter rod tube is easily released without sticking. Therefore, the fisherman can safely extend each rod pipe. In addition, in order to achieve such good fitting of the rod pipes, a structure in which the second enlarged diameter portion extends from the first enlarged diameter portion is adopted. An increase in manufacturing cost can be suppressed without complicating the structure.

FIG. 1 is an external perspective view of a fishing rod 10 according to one embodiment of the present invention. FIG. 2 is a diagram schematically showing the cross-sectional shape of the main part of the fishing rod 10. As shown in FIG. FIG. 3 is a schematic diagram showing how the fifth rod tube 15 of the fishing rod 10 is formed. FIG. 4 is a schematic diagram showing how the fifth rod pipe 15 of the fishing rod 10 is formed. FIG. 5 is a schematic diagram showing how the fifth rod pipe 15 of the fishing rod 10 is formed. FIG. 6 is a schematic diagram showing how the fifth rod tube 15 of the fishing rod 10 is formed. FIG. 7 is a schematic diagram showing how the fifth rod tube 15 of the fishing rod 10 is formed. FIG. 8 is a schematic diagram showing how the fifth rod pipe 15 of the fishing rod 10 is formed. FIG. 9 is a schematic diagram showing how the fifth rod tube 15 of the fishing rod 10 is formed.

Preferred embodiments of the present invention will now be described with reference to the drawings as appropriate. It should be noted that the present embodiment is merely one aspect of the fishing rod according to the present invention, and it goes without saying that the aspects may be changed without changing the gist of the present invention.

<Overview and points of the present embodiment>

FIG. 1 is an external perspective view of a fishing rod 10 according to one embodiment of the present invention.

This fishing rod 10 is a so-called swing-out extension rod and consists of six rod tubes 11-16. The rod pipes 11 to 16 are, in order from the tip side, the first rod pipe 11, the second rod pipe 12, the third rod pipe 13, the fourth rod pipe 14, the fifth rod pipe 15 and the sixth rod pipe. They are called rod tubes 16, and their outer diameters increase in order.

Each of the rod pipes 11 to 16 constitutes a so-called insert, and among adjacent rod pipes, the smaller diameter rod pipe slides along the axial direction 18 with respect to the larger diameter rod pipe. In the figure, the first to fifth rod pipes 11 to 15 are pulled out from the adjacent second to sixth rod pipes 12 to 16 in the axial direction 18 relative to each other, and the fishing rod 10 extends. It shows the state of Here, the “axial direction 18” is the axial direction of each of the rod pipes 11 to 16 and the longitudinal direction of the fishing rod 10. As shown in FIG. In the figure, the right side in the axial direction 18 is the front end side 24 and the left side is the rear end side 25 .

Each of the rod tubes 11 to 16 has an elongated wedge shape with a so-called taper. That is, the outer diameter of each of the rod pipes 11 to 16 is gradually enlarged at a predetermined diameter expansion rate toward the larger diameter rod pipe side, and the outer diameter of the rear end side 25 is larger than the outer diameter of the tip end side 24. designed to grow. The outer diameter of the rear end portion of the small diameter rod pipe among the adjacent rod pipes is set larger than the inner diameter of the tip portion of the large diameter rod pipe. Therefore, when the smaller diameter rod pipe is pulled out from the larger diameter rod pipe among the adjacent rod pipes, the two are fitted together and the connected state is maintained by a constant holding force.

For example, the No. 5 rod pipe 15 (corresponding to the “small diameter rod pipe” described in the claims) and the No. 6 rod pipe (corresponding to the “large diameter rod pipe” described in the claims) which are adjacent to each other. ), the fifth rod pipe 15 advances and retreats relative to the sixth rod pipe 16 along the axial direction 18 . When the fisherman pulls out the fifth rod pipe 15 from the sixth rod pipe 16 to the tip end side 24, the fifth rod pipe 15 extends from the sixth rod pipe 16 and the two are connected. Also, when the angler inserts the fifth rod pipe 15 into the sixth rod pipe 16 so as to push it in, the connection between the two is released and the fifth rod pipe 15 is shortened with respect to the sixth rod pipe 16. . The same relationship applies to other adjacent rod pipes 11-16. The sixth rod tube 16 is provided with a grip 17, and the angler can easily operate the fishing rod 10 by gripping the grip 17.

Each rod tube 11-16 is formed in a known manner. For example, a carbon fiber reinforced resin sheet (prepreg) is cut into a predetermined shape and wound around a mandrel. The prepreg is heat-treated at a predetermined temperature and then removed from the mandrel, thereby firing each of the cylindrical rod pipes 11-16. A specific molding method for each of the rod pipes 11 to 16 will be described later.

FIG. 2 is a diagram schematically showing the cross-sectional shape of the main part of the fishing rod 10. As shown in FIG. This figure shows the structure of the rear end portion 19 of the fifth rod tube 15 . In the figure, the chain double-dashed line indicates the centerline 23 of the fifth rod tube 15, and the direction of this centerline 23 coincides with the axial direction 18. As shown in FIG.

A feature of this embodiment is the shape of the rear end portion 19 of the fifth rod pipe 15, and the point that the rod pipe body 20 is provided with the first enlarged diameter portion 21 and the second enlarged diameter portion 22. is. It should be noted that the present invention is not applied only to the rear end portion 19 of the fifth rod pipe 15, but in each of the rod pipes 11 to 16, of the adjacent rod pipes 11 to 15 on the smaller diameter side. The rear end can be similarly applied and implemented.

<Configuration of No. 5 rod pipe>

As shown in FIG. 2, the fifth rod pipe 15 has a cylindrical shape centered on a center line 23, and includes a rod pipe main body 20, a first expanded diameter portion 21 provided on the rod pipe main body 20, and a 2 enlarged diameter portion 22 . The first enlarged diameter portion 21 and the second enlarged diameter portion 22 constitute the rear end portion 19 . The length L1 of the fifth rod tube 15 in the axial direction 18 is appropriately changed in design according to the specifications of the fishing rod 10, but is set to 400 mm to 1500 mm. A predetermined taper is formed along the axial direction 18 for the outer shape of the rod tube main body 20 . That is, the outer diameter of the rod pipe main body 20 is gradually increased from the front end side 24 toward the rear end side 25, in other words, toward the No. 6 rod pipe 16 side (toward the right side in the figure). ing. The diameter expansion rate of the rod tube body 20 (predetermined taper size) is 1.2/1000 in this embodiment, but is set to 0.3/1000 to 5/1000.

The first enlarged diameter portion 21 is cylindrical and has a truncated cone shape. The first enlarged diameter portion 21 is integrally formed on the outside of the outer peripheral surface of the rod pipe main body 20 and arranged so as to increase the outer diameter of the rod pipe main body 20 . A constant taper is formed along the axial direction 18 for the outer shape of the first enlarged diameter portion 21 . In other words, the outer diameter of the first enlarged diameter portion 21 has a constant diameter expansion rate T1 (described in the scope of claims) from the front end side 24 to the rear end side 25 (toward the sixth rod tube 16 side). (equivalent to the “first diameter expansion rate”). This diameter expansion rate T1 is 2.5/1000 in this embodiment, but is set to 0.5/1000 to 5/1000.

The second enlarged diameter portion 22 is also cylindrical and has a truncated cone shape. The second enlarged diameter portion 22 extends continuously from the first enlarged diameter portion 21 so as to expand in a funnel shape toward the rear end side 25 (toward the sixth rod tube 16 side). formed. A constant taper is formed along the axial direction 18 for the outer shape of the second enlarged diameter portion 22 . That is, the outer diameter of the second enlarged diameter portion 22 has a constant diameter expansion rate T2 (corresponding to the "second diameter expansion rate" described in the claims) from the front end side 24 to the rear end side 25. is gradually expanding. Although this diameter expansion rate T2 is 8/1000 in this embodiment, it is not particularly limited as long as it is equal to or greater than the diameter expansion rate T1. However, it is preferable to set within the range of 8/1000 or less.

In this embodiment, the diameter expansion rate T2 is not uniform, but is formed so as to gradually increase toward the rear end side 25 . That is, the diameter expansion rate T2 is 2/1000 at the portion 26 where the second diameter expansion portion 22 and the first diameter expansion portion 21 are continuous, but gradually increases from this portion 26 toward the rear end side 25. and 8/1000 at the rear end 27 of the second enlarged diameter portion 22 . Note that the change rate of the diameter expansion rate T2 may or may not be uniform, and the design may be changed as appropriate.

The length L2 of the first enlarged diameter portion 21 can be set to 20 mm to 150 mm, and the length L3 of the second enlarged diameter portion 22 can be set to 5 mm to 50 mm. Therefore, the length (L2+L3) of the rear end portion 19 is 25 mm to 200 mm.

The rod tube main body 20 is made of a carbon fiber-reinforced resin having an elastic modulus E1 of 40000 kgf/mm2. However, the modulus of elasticity E1 can be appropriately set within the range of 5000 kgf/mm2 to 80000 kgf/mm2 depending on the specifications of the fishing rod 10.

The first enlarged diameter portion 21 is also made of resin (typically epoxy resin) reinforced with carbon fiber, and the elastic modulus E2 of this carbon fiber is the same as the elastic modulus E1. However, the elastic modulus E2 does not need to match the elastic modulus E1. In this embodiment, the carbon fibers are aligned along the circumferential direction of the first enlarged diameter portion 21 (corresponding to the "first fiber direction" described in the claims). For this reason, the first enlarged diameter portion 21 has a predetermined rigidity (corresponding to "first rigidity" described in the claims) in the radial direction. Note that the carbon fibers may be aligned along a direction other than the circumferential direction. Also, as the fibers that reinforce the resin, glass fibers or other fibers may be employed instead of carbon fibers. However, the resin does not have to be reinforced with fibers.

The second enlarged diameter portion 22 is also made of carbon fiber-reinforced resin (typically epoxy resin). The carbon fibers are aligned along a direction crossing the circumferential direction of the first enlarged diameter portion 21 (corresponding to the "second fiber direction" described in the claims). In this embodiment, the modulus of elasticity E3 of this carbon fiber is set to 24000 kgf/mm2, but it can be set appropriately between 5000 kgf/mm2 and 60000 kgf/mm2. Therefore, the second enlarged diameter portion 22 has a predetermined rigidity (corresponding to the “second rigidity” described in the claims) in the radial direction 28 . In this embodiment, the rigidity of the second enlarged diameter portion 22 is smaller than the rigidity of the first enlarged diameter portion 21 . However, the rigidity of the second enlarged diameter portion 22 may be greater than the rigidity of the first enlarged diameter portion 21 .

In this case, the "rigidity" is the degree of elastic distortion of the first enlarged diameter portion 21 and the second enlarged diameter portion 22 when a constant external force acts in the radial direction 28, and this "rigidity" is large. The distortion of the first enlarged diameter portion 21 and the second enlarged diameter portion 22 becomes smaller as the number increases. Therefore, in the present embodiment, the second enlarged diameter portion 22 is more likely to be elastically deformed in the radial direction 28 than the first enlarged diameter portion 21, and particularly the rear end 27 of the second enlarged diameter portion 22 is easily displaced. can.

In the present embodiment, the first enlarged diameter portion 21 and the second enlarged diameter portion 22 are made of resin reinforced with carbon fibers, but the second enlarged diameter portion 22 is made of a material in which a nonwoven fabric is impregnated with resin. may In this case, the elastic modulus of the fibers forming the nonwoven fabric is set to 1000 kgf/mm2 or less.

3 to 9 are schematic diagrams showing how the fifth rod tube 15 is formed.

FIG. 3 is a diagram showing the layout of the resin sheets 31 to 34 and the mandrel 30 that constitute the fifth rod pipe 15. As shown in FIG. The resin sheets 31 to 34 are arranged on the mandrel 30 as shown in the figure. The mandrel 30 is a metal core around which the resin sheets 31 to 34 are wound, and the outer shape of the mandrel 30 determines the shape of the rod pipe main body 20 (the expansion rate of the outer diameter of the rod pipe main body 20). The resin sheet 31 is a prepreg containing carbon fiber having the elastic modulus E1, and constitutes the rod tube main body 20. As shown in FIG. The resin sheet 32 is a prepreg containing carbon fiber having the elastic modulus E2, and constitutes the first enlarged diameter portion 21 . The resin sheet 33 is a prepreg containing carbon fiber having the elastic modulus E3, and constitutes the second enlarged diameter portion 22 . As described above, the fibers contained in the resin sheets 31 to 33 may be glass fibers or other fibers instead of the carbon fibers, and the resin sheet 33 may contain the nonwoven fabric instead of the carbon fibers. It may be However, the resin sheets 31 to 34 may not contain the fibers. The resin sheet 34 covers the resin sheets 32 and 33, and is a prepreg containing carbon fiber having the elastic modulus E1 in this embodiment. The fibers contained in the resin sheet 34 may also be glass fibers or other fibers instead of carbon fibers, or the fibers may not be contained.

The resin sheets 31 and 32 are cut into a predetermined shape as shown in the drawing. The resin sheet 31 is wound around the mandrel 30, as shown in FIG. At this time, the rear end of the resin sheet 32 is arranged so as to match the rear end of the resin sheet 31 . Next, the resin sheet 33 is cut into a shape as shown in FIG. That is, the resin sheet 33 has a narrow width portion 35 and a wide width portion 36 . The narrow width portion 35 is rectangular, and the wide width portion 36 is trapezoidal, the width dimension of which is gradually increased continuously from the narrow width portion 35 . As shown in FIG. 5, the resin sheet 33 is wound around the mandrel 30 from the narrow portion 35 side. At this time, the narrow portion 35 is arranged to face the rear ends of the resin sheets 31 and 32, and the resin sheet 33 is wound around the mandrel 30 in this state. As a result, the resin sheet 33 is arranged in the position and region shown in FIG. 6 with respect to the resin sheets 31 and 32 . Furthermore, the resin sheet 34 is cut into a trapezoidal shape as shown in FIG. The resin sheet 34 is placed at the position shown in FIG. 7 and wrapped around the resin sheets 32 and 33 . At this time, the rear end of the resin sheet 34 is displaced from the rear end of the resin sheet 33 toward the rear end side 25 by a predetermined dimension S. This dimension S is set to 10 mm in this embodiment, but is designed in the range of 5 mm to 50 mm. The resin sheet 34 completely covers the resin sheet 33 as shown in FIG.

Each of the resin sheets 31 to 34 is heated at a predetermined temperature for a predetermined time while being wound around the mandrel 30 . This heat treatment is performed by known processes. By this heat treatment, the resin sheets 31 to 34 are integrated. After that, the mandrel 30 is pulled out, and as shown in FIG. 9, the No. 5 rod tube 15 is fired. As shown in the figure, the rear end portion 19 of the fifth rod pipe 15 has three layers 37 to 39 formed around the rod pipe main body 20 by resin sheets 32 to 34 . This rear end portion 19 is cut at a predetermined position 41 to determine the rear end 42 of the fifth rod tube 15 . Further, the layer 37 constitutes the first enlarged diameter portion 21 and the layer 38 constitutes the second enlarged diameter portion 22 through a grinding process which will be described later. Layer 39 formed by resin sheet 34 prevents layer 38 from crashing when mandrel 30 is withdrawn.

Next, the grinding process for the fifth rod tube 15 will be described. In this grinding step, the outer peripheral surface of the rear end portion 19 is ground, and the shapes of the first enlarged diameter portion 21 and the second enlarged diameter portion 22 are finished. In the figure, a dotted line 40 indicates the boundary between the cutting margins of the first enlarged diameter portion 21 and the second enlarged diameter portion 22 . The procedure for grinding the rear end portion 19 is known, and is performed by a grinding machine using a so-called "profiling die". First, layer 37 is ground along dotted line 40 . As a result, the outer peripheral surface of the layer 37 is tapered at the diameter expansion rate T1, and the first enlarged diameter portion 21 is formed (see FIG. 2). Further, layer 38 is ground along dashed line 40 . The dotted line 40 corresponding to the region of this layer 38 is a curved line that gradually expands radially outwardly toward the trailing edge 25 as shown in FIG. As a result, the outer peripheral surface of the layer 38 is tapered at the diameter expansion rate T2, and the second enlarged diameter portion 22 is formed (see FIG. 2). By grinding the layers 37 and 38, the layer 39 is completely removed.

The other rod pipes 11-14 are formed in a similar manner. Since the sixth rod tube 16 is a so-called base rod, it does not have a structure corresponding to the first enlarged diameter portion 21 and the second enlarged diameter portion 22 at its rear end portion.

<Action and effect of the present embodiment>

When the fifth rod pipe 15 is pulled out from the sixth rod pipe 16 , the rear end portion 19 of the fifth rod pipe 15 is fitted with the front end portion of the sixth rod pipe 16 . Specifically, the first enlarged diameter portion 21 and the second enlarged diameter portion 22 (see FIG. 2) are pressed against the inner wall of the tip portion of the sixth rod tube 16, and are fitted together. Since the diameter expansion ratio T2 of the second diameter expansion portion 22 and the diameter expansion ratio T1 of the first diameter expansion portion 21 are set as described above, the second diameter expansion portion 22 has a shape as shown in FIG. , and has a funnel shape in which the outer diameter gradually increases from the first enlarged diameter portion 21 toward the rear end side 25 (the sixth rod pipe 16 side). Therefore, when the fifth rod pipe 15 is pulled out from the sixth rod pipe 16, the second expanded diameter portion 22 slides on the inner wall of the tip portion of the sixth rod pipe 16 and is radially compressed and elastically compressed. transform.

In other words, when the fisherman pulls out the No. 5 rod pipe 15 from the No. 6 rod pipe 16, the first enlarged diameter portion 21 is fitted to the No. 6 rod pipe 16 and the No. 5 rod pipe Deformation of the second enlarged diameter portion 22 progresses elastically according to the amount by which the rod pipe 15 is pulled out. This allows the fisherman to feel the fitting state of the rod pipes while pulling the adjacent rod pipes, thereby realizing high-grade operability. Moreover, since the fifth rod pipe 15 and the sixth rod pipe 16 are securely fitted together due to the elastic deformation of the second enlarged diameter portion 22, the fifth rod pipe 15 is prevented from coming off during actual fishing. Furthermore, since the second enlarged diameter portion 22 is elastically deformed, the adhesion between the second enlarged diameter portion 22 and the sixth rod pipe 16 is suppressed, and the fifth rod pipe 15 and the sixth rod pipe 16 are suppressed. can be easily released. Therefore, the fisherman can extend the No. 5 rod pipe 15 with confidence. In addition, in order to realize good fitting between the fifth rod pipe 15 and the sixth rod pipe 16, the second enlarged diameter portion 22 is provided in the first enlarged diameter portion 21, which is a simple arrangement. Since the structure is adopted, there is also an advantage that an increase in the manufacturing cost of the fishing rod 10 can be suppressed.

In this embodiment, the description is limited to the relationship between the fifth rod pipe 15 and the sixth rod pipe 16, but it goes without saying that the same applies to a pair of adjacent rod pipes.

In the present embodiment, since the diameter expansion rate T2 of the second enlarged diameter portion 22 is larger than the diameter expansion rate T1 of the first enlarged diameter portion 21, the second enlarged diameter portion 22 protrudes radially outward. Therefore, when the fisherman pulls out the fifth rod pipe 15, it is easier to sense the fitting state between the second enlarged diameter portion 22 and the sixth joint 16 in more detail.

In particular, by setting the diameter expansion rate T2, the second diameter expansion portion 22 broadens in a curved shape toward the sixth rod pipe 16 side. Therefore, the fitting force between the second expanded diameter portion 22 and the sixth rod pipe 16 increases more gently with respect to the amount of withdrawal of the fifth rod pipe 15, which is convenient for the angler. operation feeling is improved.

In the present embodiment, the second enlarged diameter portion 22 deforms more easily than the first enlarged diameter portion 21, so when the fisherman pulls out the No. 5 rod tube 16, the second enlarged diameter portion 22 deforms more. , and the operational feeling of the fifth rod tube 15 is further improved. In addition, even if the second enlarged diameter portion 22 is configured to be more difficult to deform than the first enlarged diameter portion 21, the second enlarged diameter portion 22 is easily deformed.

In this embodiment, since the resin forming the fifth rod pipe 15 is reinforced with the fibers, when the second enlarged diameter portion 22 and the sixth rod pipe 16 are fitted together, the second enlarged diameter Buckling of the portion 22 is suppressed. In particular, the fibers contained in the first enlarged diameter portion 21 are aligned along the circumferential direction and intersect with the fibers contained in the second enlarged diameter portion 22 . That is, since the fibers included in the second enlarged diameter portion 22 are aligned in the direction intersecting the circumferential direction, the second enlarged diameter portion 22 is more easily deformed, and the operational feeling is further improved. .

In particular, if the second enlarged diameter portion 22 is made of a nonwoven fabric (preferably, a nonwoven fabric made of fibers having an elastic modulus of 1000 kgf/mm2 or less) impregnated with a resin, the second enlarged diameter portion 22 becomes even more It becomes easy to deform, and the feeling of operation of the No. 5 rod pipe 15 is improved for the fisherman.

In the present embodiment, the fifth rod pipe 15 is made of resin reinforced with carbon fibers, so that the elastic deformation of the fifth rod pipe 15 can be adjusted relatively freely according to the direction of the fibers. Moreover, the use of carbon fibers as reinforcing fibers facilitates strength design while achieving weight reduction.

DESCRIPTION OF SYMBOLS 10... Fishing rod 15... No. 5 rod pipe 16... No. 6 rod pipe 18... Axial direction 19... Rear end part 20... Main body of rod pipe 21... First extension Diameter portion 22 Second enlarged diameter portion 23 Center line 24 Front end side 25 Rear end side 26 Continuous portion 28 Radial direction T1 Diameter expansion rate T2...Diameter expansion rate

Claims (7)

A swing-type fishing rod constructed so that a small-diameter rod pipe is pulled out from a large-diameter rod pipe and both are joined at a predetermined position,
The small-diameter rod pipe is made of fiber-reinforced resin,
a first diameter-expansion portion whose outer diameter gradually expands toward the large-diameter rod tube side at a first diameter expansion rate and whose fibers are aligned in a predetermined first fiber direction ;
Further extending from the first enlarged diameter portion toward the large diameter rod tube side, the outer diameter gradually expands toward the large diameter rod tube side at a second diameter expansion rate different from the first diameter expansion rate. and a second expanded diameter portion in which fibers are aligned in a second fiber direction different from the first fiber direction . The second diameter expansion rate is greater than the first diameter expansion rate,
A swing-type fishing rod according to claim 1. The second diameter expansion rate gradually increases toward the large-diameter rod tube side,
A swing-type fishing rod according to claim 1 or 2. The first enlarged diameter portion has a first rigidity in the radial direction, the second enlarged diameter portion has a second rigidity in the radial direction, and the first rigidity and the second rigidity are different from each other,
A swing-type fishing rod according to any one of claims 1 to 3. the second stiffness is less than the first stiffness;
A swing-type fishing rod according to claim 4. The first fiber direction includes at least the circumferential direction of the small-diameter rod pipe,
The second fiber direction is a direction crossing the first fiber direction,
A swing-type fishing rod according to any one of claims 1 to 5 . The fiber reinforced resin is a carbon fiber reinforced resin ,
A swing-type fishing rod according to any one of claims 1 to 6 .

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