JP3745945B2 - Jointed fishing rod - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint type fishing rod, and is applied to a swing type fishing rod and a joint type fishing rod.
[0002]
[Prior art]
In the case of a joint type fishing rod, the small-diameter rod pipe joined to the joint portion of the large-diameter rod tip deflects when a load is applied, such as when a fish is caught, and the joint of the joined large-diameter rod It is pressed against the joint tip. As a result, stress concentration occurs at this portion of the small-diameter soot tube, and the small-diameter soot tube is damaged under a large load. Furthermore, the inner diameter of the large-diameter soot tube is pressed against the rear end of the joining portion of the small-diameter soot tube, causing stress concentration. In such a case, in order to protect the soot tube from stress concentration, Japanese Utility Model Laid-Open No. 3-129065 discloses a structure in which reinforcing members are provided in the innermost layer of the large diameter soot tube and the innermost layer of the small diameter soot tube.
[0003]
[Problems to be solved by the invention]
However, if each rod is reinforced, the rigidity of the joining region is further increased in the entire fishing rod, and the smooth flexibility of the fishing rod as a whole is inhibited more than usual.
Therefore, an object of the present invention is to prevent stress concentration on the small-diameter rod pipe at the joining portion without hindering the flexibility of the fishing rod as much as possible.
[0004]
[Means for Solving the Problems]
In view of the above-mentioned object, the present invention provides a small-diameter soot tube according to claim 1 in which the distal end portion of the large-diameter soot tube has the same bending rigidity in a state where the hollow small-diameter soot tube is joined to the large-diameter soot tube. A low-rigidity portion that is less than or equal to the bending rigidity, and the main body portion on the front side of the joint portion of the small-diameter steel pipe is configured to have a smaller diameter than the joint portion, and the main-body portion is the large-diameter steel plate. The large-diameter soot tube low-rigidity region, which penetrates into the rear side of the low-rigidity portion of the pipe and is equal to or less than the bending stiffness of the small-diameter soot tube in the same position, is the low-rigidity portion other than the large-diameter soot tube tip. A joint type fishing rod characterized by the fact that it is not available.
Since the bending stiffness of the tip of the large-diameter rod is less than that of the small-diameter rod at the same position, the small-diameter rod is deflected by the bending load of the fishing rod and pressed against the tip of the large-diameter rod. The soot tube does not have to be subjected to a large stress concentration. Moreover, since the main body part, which is smaller in diameter than the joint part, penetrates into the rear inside of the low-rigidity part of the large-diameter soot tube, even if the small-diameter soot pipe is bent when subjected to a bending load, the large-diameter soot Since there is a gap between the inner surface of the low-rigidity portion of the pipe, it is difficult for pressure to be applied to the inner surface of the large-diameter saddle tube, and stress concentration is less likely to occur.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail based on an embodiment shown in the accompanying drawings.
FIG. 1 is a longitudinal cross-sectional view near a joining portion of a fishing rod according to the present invention, and FIG. 2 is an explanatory view of a method for manufacturing a large-diameter rod pipe therein. The joint type fishing rod here is a swing-type jointed fishing rod, and has rod tubes 10 and 12 made of a fiber reinforced resin reinforced with a reinforced fiber such as a carbon fiber using a synthetic resin such as an epoxy resin as a matrix. . The rear portion of the hollow small diameter trough tube 10 on the front side is a joint portion 10B, and the front side thereof is a main body portion 10A that is smaller in diameter than the joint portion. The large-diameter soot tube 12 is formed with a joint portion 12B that joins the joint portion 10B of this small-diameter soot tube in a swing-out manner.
[00 06 ]
The cross-sectional structure of the large-diameter soot pipe 12 has a reinforcing layer 12d in the innermost layer at the joint portion 12B, and extends over the entire length of the large-diameter soot pipe, and the reinforcing fibers are generally oriented in the circumferential direction. The inner layer 12c has an intermediate layer 12b on which the reinforcing fibers are generally oriented in the axial direction, and an outer layer 12a on which the reinforcing fibers are generally oriented in the circumferential direction. Is provided. However, the reinforcing fiber is generally oriented in the circumferential direction in a part (inner layer side) 12e of the intermediate layer 12b at the distal end portion 12S (also the distal end portion of the joining portion) of the large-diameter soot tube. The distal end portion 12S is a low-rigidity portion that is configured to be less rigid than the small-diameter rod 10 at the same position in the axial direction in the seamed state of FIG.
[00 07 ]
In this embodiment, the joint portion 10B of the small-diameter soot tube 10 is located behind the tip portion 12S of the large-diameter soot tube 12, and the leading-end portion 12S of the large-diameter soot tube 12 The main body 10A has a lower rigidity than the main body 10A. The intermediate layer 12b is configured to be thicker than the other layers except for the distal end portion 12S, and the bending rigidity of the large-diameter soot tube 12 is mainly controlled by this intermediate layer. Similarly to the conventional case, the small-diameter rod 10 also has a three-layer structure including the inner layer, the intermediate layer, and the outer layer over the entire length, and the joint portion 10B has a larger outer diameter as in the conventional case. In order to improve the strength, etc., a reinforcing layer is formed by winding a prepreg such as a woven fabric around the outer peripheral portion (on the three layers) and thermosetting it.
The three-layer structure of each of the soot tubes 10 and 12 described above is an example of the soot tube structure, and is not limited to this and is arbitrary.
[00 08 ]
As shown in a cutaway view in FIG. 2, a prepreg 12d ′ in which a prepreg 12d2 ′ in which reinforcing fibers are oriented in the circumferential direction is superimposed on a prepreg 12d1 ′ such as a woven cloth having reinforcing fibers intersecting on the inner side is a cored bar. It winds around 14 tips. Further, a prepreg 12b1 ′ in which the reinforcing fibers are generally oriented in the axial length direction is overlaid on the prepreg 12c ′ in which the reinforcing fibers are generally oriented in the circumferential direction. A prepreg on which short prepregs 12e ′ oriented in the circumferential direction are stacked is wound on the wound prepreg 12d ′. Furthermore, a prepreg in which a prepreg 12a ′ in which reinforcing fibers are generally oriented in the circumferential direction is stacked on a prepreg 12b2 ′ in which reinforcing fibers are generally oriented in the axial direction is wound.
[00 09 ]
This is heat-cured to form the large-diameter rod 12 of FIG. The prepreg 12a ′ corresponds to the outer layer 12a, the prepregs 12b2 ′ and 12b1 ′ correspond to the intermediate layer 12b, the prepreg 12c ′ corresponds to the inner layer 12c, and the prepreg 12e ′ corresponds to the layer 12e. The length of the tip portion 12S is set to about 5 to 50% of the length of the joint portion 12B, and the actual size is preferably about 3 to 15 mm. The length is at least 1 mm or more. These length matters are the same in other forms described later.
With the above configuration, stress concentration on the main body portion 10A of the small-diameter rod 10 is prevented when the fishing rod is bent. Unlike this embodiment, even if the joint portion 10B of the small-diameter soot tube reaches the tip of the large-diameter soot tube, or the tip of the large-diameter soot tube reaches the tip of the small-diameter soot tube, If the rigidity is the same as or lower than that of the pipe, stress concentration of the small-diameter rod is similarly prevented, but such a configuration does not belong to claim 1.
[00 10 ]
An example of the bending stiffness EI value at the tip position of the large-diameter rod pipe at each joining site is shown by taking an eight-drawing fishing rod as an example.
Each tub tube is sequentially designated as No. 1, No. 2, No. 3, No. 4, No. 5, No. 6, No. 7, and No. 8.
4th and 5th EI (kgf · mm ² ) (N · mm ² )
No. 4 (small-diameter pipe) 2,594,449 25,442,853
No. 5 (Large diameter pipe) 2,403,101 23,566,370
5th and 6th EI (kgf · mm ² ) (N · mm ² )
No. 5 (small-diameter steel pipe) 5,342,680 52,393,793
No. 6 (large-diameter pipe) 3,719,418 36,475,031
6th and 7th EI (kgf · mm ² ) (N · mm ² )
No. 6 (small-diameter steel pipe) 7,754,613 76,046,776
No. 7 (Large diameter pipe) 5,254,377 51,527,836
7th and 8th EI (kgf · mm ² ) (N · mm ² )
No. 7 (small-diameter steel pipe) 11,737,967 115,110,134
No.8 (Large diameter pipe) 6,182,916 60,633,693
[00 11 ]
In the above example, the four joining sites close to the hand are configured in the rigid relationship of the joining site of the present application, but the other joining sites have a large bending rigidity on the large-diameter side tube as usual. The bending stiffness at the distal end position of the large-diameter rod at each joint site is a value in the range of approximately 30 to 100 when the bending stiffness of the small-diameter rod at the same position is expressed as 100 as a reference. This value (ratio) is preferably gradually increased from the proximal side toward the distal side, including the same case. This is the case at the joint part from the hand to the middle, and at the joint part of the tip part, it may be a conventional rigidity relationship exceeding 100, and at all the joint parts, it is less than the bending rigidity of the small diameter pipe. It may be configured. Furthermore, the bending rigidity of the tip portion 12S of the joint portion 12B of the large-diameter rivet tube is about 30 to 60 if the bending rigidity of the remaining portion excluding the tip portion 12S from the joint portion 12B is 100. preferable. Each item of this paragraph can be used alone, or may be used in combination with the description items (such as the length of 0010) of this paragraph or other paragraphs (for example, 0010). The same applies to.
[00 12 ]
FIG. 3 is a longitudinal sectional view near another fishing rod joining portion according to the present invention, and only matters different from FIG. 1 will be described. In the distal end portion 12S of the large-diameter soot tube, the reinforcing fibers are oriented substantially in the circumferential direction in a part (outer layer side) 12e ″ of the intermediate layer 12b, whereby the distal end portion 12S is in the joined state of FIG. Is configured to be lower in rigidity than the small-diameter rod 10 at the same position in the axial direction.
[00 13 ]
FIG. 4 is a longitudinal sectional view near another fishing rod joining portion according to the present invention, and only matters different from FIG. 1 will be described. At the distal end portion 12S of the large-diameter soot tube, the intermediate layer 12b is made thin, so that the distal end portion 12S has a lower rigidity than the small-diameter soot tube 10 at the same position in the axial length direction in the joined state of FIG. It is configured. With reference to FIG. 5, a manufacturing method of the large-diameter soot tube 12 of this example will be described.
[00 14 ]
A prepreg 12 d ′ having the same structure as described in FIG. 2 is wound around the tip of the core metal 14. Further, the prepreg 12d ′ in which the prepreg 12c ′ in which the reinforcing fibers are generally oriented in the circumferential direction and the prepreg 12b2 ′ in which the reinforcing fibers are generally oriented in the axial length direction is overlapped on the prepreg 12c ′ in which the reinforcing fibers are generally oriented in the circumferential direction is wound. Wrap on top of. The prepreg 12b1 ′ in which the reinforcing fiber is oriented in the axial length direction is wound by shortening the tip portion of the prepreg by δ (the length corresponding to the large diameter trough tube tip portion 12S), and further, the prepreg 12c ′ A similar prepreg 12a 'having the same length as is wound.
[00 15 ]
When the fishing rod receives a deflection load, the reinforcing fibers are directed toward the joining portion 10B of the small-diameter rod pipe 10 so that the bending of the fishing rod is less likely to be U-shaped and smooth near the joining portion. It is preferable to be disposed. It is preferable to be arranged symmetrically with respect to the axial direction, and the inclination angle is preferably closer to 45 degrees. In addition, as a result, as shown in FIGS. 1, 3, and 4, the main body portion 10 </ b> A has a smaller diameter than the joint portion, and the main body portion penetrates into the large-diameter soot tube 12. If it is, the main body portion 10A of the small-diameter soot tube is difficult to come into contact with the tip of the large-diameter soot tube, which contributes to prevention of stress concentration in the present application.
[00 16 ]
【The invention's effect】
As is apparent from the above description, according to the present invention, it is possible to prevent stress concentration on the small-diameter rod pipe at the joining portion without hindering the flexibility of the fishing rod as much as possible.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part of a fishing rod according to the present invention.
FIG. 2 is a production diagram of the large-diameter soot tube of FIG.
FIG. 3 is a longitudinal sectional view of another embodiment according to the present invention.
FIG. 4 is a longitudinal sectional view of still another embodiment according to the present invention.
5 is a manufacturing diagram of the large-diameter soot tube of FIG. 4. FIG.
[Explanation of symbols]
10 Small Diameter Steel Pipe 10A Small Diameter Steel Pipe Body 10B Small Diameter Steel Pipe Joint 12 Large Diameter Steel Pipe 12B Large Diameter Steel Pipe Joint 12S Large Diameter Steel Pipe Tip

Claims (1)

  In a state where the hollow small-diameter soot pipe is joined to the large-diameter soot pipe, the bending rigidity of the distal end portion of the large-diameter soot pipe includes a low-rigidity portion that is equal to or less than the bending rigidity of the small-diameter soot pipe at the same position, The main body portion on the front side of the joint portion of the small-diameter soot tube is configured to have a smaller diameter than the joint portion, and the main body portion penetrates into the rear interior of the low-rigidity portion of the large-diameter soot tube. A joint type fishing rod characterized in that there is no large-diameter rod tube low-rigidity region below the bending rigidity of the small-diameter rod tube at the same position other than the low-rigidity portion which is the large-diameter rod tube tip.

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