JPH09322677A - Inwardly threaded fishing rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inwardly threaded fishing rod excellent in handleability and good in the balance between the strength and distortion stiffness of a fishing pipe having a hole for guiding a fishing line by disposing a backwardly tapered region backwardly gradually reduced in the inner space and continued to the hole for guiding the fishing line. SOLUTION: This inwardly threaded fishing rod is provided with a hole 12H for guiding a fishing line. Therein, backwardly tapered regions L2, L3 having a backwardly gradually reduced inner space S is disposed in the front region containing the hole for guiding the fishing line. The generation of stress concentration on the distortion of the fishing rod can thereby be prevented. A fishing line guide member 26 is preferably disposed in the fishing line guide hole 12H.

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 A fishing rod has a tapered taper whose outer diameter is increased toward the original side and its internal space is tapered so that the flexural rigidity has a predetermined balance. Generally, it is generally constant.

[0003]

However, in the region where the hole for the fishing line introducing portion of the hollow fishing rod is provided, it is generally necessary to increase the thickness in order to reinforce the lack of strength due to the existence of the fishing line introducing portion hole. There is. However, if the thickness is increased, the flexural rigidity of this portion becomes too high, and the flexibility is impaired. Therefore, it is desired to have a structure capable of reinforcing the thick wall without impairing the flexibility.

Therefore, an object of the present invention is to provide a hollow fishing rod in which the strength and the flexural rigidity of a rod tube having a hole for a fishing line introducing portion are well balanced.

[0005]

In view of the above object, the present invention provides a rod tube provided with a hole for a fishing line introducing portion, which is continuous to the hole portion in a front region including the hole for the fishing line introducing portion. However, a hollow fishing rod is provided in which the inner space thereof has a rear narrow taper-shaped region that gradually decreases rearward.

Since the inner space of the rod tube having the hole for the fishing line introducing portion has a taper shape in the rear part in a predetermined length including the hole, the peripheral portion of the hole for the fishing line introducing portion is thickened for reinforcement. Even if it is made thicker, the outer diameter of the hole for the fishing line introducing portion can be set smaller than that of the conventional rod tube having a tapered inner space, and therefore, it is proportional to the fourth power of the diameter. The flexural rigidity can be pressed to a predetermined flexural rigidity so that the flexural rigidity does not become too high. Furthermore, as described above, the outer diameter can be set smaller than before in the peripheral area of the hole even if it is reinforced with a thick wall. The distance (radius) can be reduced, which reduces the maximum stress due to bending, which in turn improves the strength of the rod tube.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to an embodiment shown in the accompanying drawings. FIG. 1 is a side view of a hollow fishing rod according to the present invention, and FIG. 2 is a vertical cross-sectional view before and after the hollow fishing rod. Each rod tube is made of a fiber reinforced plastic using carbon fiber or the like, and a middle rod 12 is spliced in parallel to the front small-diameter portion 10A of the original rod 10, and the middle rod 12 has a tip rod 14 Are spliced side by side. In this case, the base rod 10 and the middle rod 12 may be of a drawing type or a spigot joint type. A top guide 16 is attached to the tip of the tip rod 14, a reel leg fixing device 18 to which the reel 20 is attached is provided in the original rod 10, and a fishing line insertion hole is formed in the rear portion of the middle rod 12. A fishing line introducing guide member 26 made of ceramics is provided in the hole 12H for the fishing line introducing portion. The fishing line 22 is pulled out from the top guide 16 through the fishing line insertion hole. Reference numeral 24 denotes a bottom plug, which is detachably screwed.

A plug 14E holding a ceramic guide ring GR is screwed to the rear end of the tip rod 14, and a bundle of carbon fibers and the like impregnated with an epoxy resin or the like is provided inside. Are heat-cured together when the tip rod 14 is heat-cured, and the spiral guide 14G is integrated. A similar spiral guide 12G is also integrated with the middle rod 12.

The inner space of the middle rod 12 is tapered backward. That is, the joint portion 12T at the tip portion is a straight internal space, and is abruptly contracted at the rear end thereof, and the rear inner surface 12S thereof has a rear thin taper shape in which the inner diameter is gradually contracted toward the rear end. In order to prevent the strength of the middle rod 12 from being insufficient due to the influence of the fishing line introducing hole 12H provided in the rear portion of the middle rod 12, it is necessary to thicken the peripheral portion of the hole. Even if the inner wall 12S is thickened, since the inner surface 12S has a rear thin taper shape, the outer diameter dimension thereof is smaller than that in the case of the front thin taper. Therefore, the flexural rigidity can be suppressed to a low level, a predetermined flexibility can be imparted to the front region including the vicinity of the fishing line introducing portion, the rod tone can be desired, the hole peripheral portion can be reinforced, and the rod pipe can be reinforced. A fishing rod having a good balance between strength and flexural rigidity can be provided. In this example, the front small-diameter portion 10A of the base rod is also set to be slightly bent.

Further, in the front region including the hole for the fishing line introducing portion, since the internal space except the splicing portion 12T has a rear thin taper shape, the thickness of the region other than the thickened hole peripheral portion is If the thickness is set to be thin as in the conventional case, the outer diameter dimension is smaller particularly toward the rear of the hole 12H as compared with the case of the front thin taper, and the flexural rigidity of the middle rod 12 is generally insufficient, and desired flexure characteristics cannot be obtained. . Therefore, the front region continuing to the peripheral portion of the hole is thickened while gradually reducing the thickness toward the front. The outer shape of the middle rod 12 formed in this manner is a front thin taper shape.

In this way, not only the peripheral portion of the hole 12H, but also the region following it is gradually made thicker, which means that the boundary between the reinforced thickened region in the peripheral region of the hole and the region following it. In the portion, it is possible to prevent stress concentration from occurring when the rod is bent, which is also preferable from the viewpoint of rod tube strength.

An example of the dimensions of the middle rod 12 having the above structure will be shown below. The length L1 of the joint portion 12T is 140 mm, the length L3 of the region including the hole peripheral portion is 280 mm, and the length L2 of the intermediate region is 841 mm. The inner diameter at the tip position P1 is 9.30 mm, the outer diameter is 10.10 mm,
Therefore, the wall thickness is 0.40 mm, the inner diameter at position P2 is 7.38 mm, and the outer diameter is 9.30 mm. Therefore, the wall thickness is 0.96 mm, and the inner diameter is 7.18 mm at the boundary position P3 with different tapers. The diameter is 12.70 mm,
Therefore, the wall thickness is 2.76 mm, the inner diameter at the rear end position P4 is 7.10 mm, and the outer diameter is 13.87 mm.
Therefore, the wall thickness is 3.39 mm.

As described above, since the inner space of the joint portion 12T of the middle rod 12 is straight and the rear space is a taper at the rear, the core metal is made continuous and the prepreg is wound around it. Can be molded. The removal is performed in front of the middle rod 12. In this way, by using the cored bar that is pulled out forward, the joint portion 12T at the front end portion can be integrally heat-molded together with the main body portions L2 and L3. Therefore, the manufacturing cost of the rod tube can be reduced and the rod tube quality and strength can be improved as compared with the case where the joining portion 12T is joined to the main body later.

If the diameter of the inside of the joint portion 12T is expanded as described above, the tip rod 14 joined in parallel to this is formed.
The inner diameter D1 of the rear joint portion can be made almost the same as the inner diameter D2 of the middle rod 12, and the resistance at the time of feeding the fishing line can be reduced. Therefore, in this example, the plug body 14E at the rear end of the tip rod 14 and the guide ring GR are set to have large inner diameters within a possible range.

Further, the spiral guides 14G and 12G are integrally heat-molded together with the rod tubes 14 and 12, but if they are integrally heat-molded in this way, the axial longitudinal reinforcing fibers near the inner surface of each rod tube tend to meander. , The strength of the rod pipe may be reduced due to the meandering. In this regard, since the inner rod 12 has a large thickness in most of its region, it is unlikely to be affected by the integral formation of the spiral guide 12G, and a decrease in strength can be prevented. In the above, the fishing line introduction guide member 26 having an open upper part is used for the fishing line introduction part, but other types of members may be used, and the fishing line introduction part may be provided by taking the middle rod 12 as an example. However, the present invention is not limited to this, and may be a base rod or another rod tube.

[0016]

As is apparent from the above description, according to the present invention, it is possible to provide a medium-through fishing rod in which the strength and the flexural rigidity of a rod tube having a hole for a fishing line introducing portion are well balanced.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional view of a main part of FIG.

[Explanation of symbols]

 12 Middle Rod 12H Fishing Line Introducing Portion 12S Rear Thin Tapered Inner Surface 12T Joint Section

Claims (1)

[Claims] 1. A rod pipe provided with a hole for a fishing line introducing portion, which is continuous with the hole portion in a front region including the hole portion for the fishing line introducing portion and whose inner space is gradually reduced rearward. An intermediate fishing rod having an area of a thin taper shape.