JPH0612917Y2 - Original rod forming core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a core rod for forming a base rod.

(Prior Art) Conventionally, since the rod tube has a circular cross section, it has a drawback that it cannot slide smoothly in a grasped hand and the fishing operation cannot be performed smoothly.

For this reason, a circular tubular body is first formed using a circular core metal, and then a prepared crescent-shaped appendage is attached to it for reasons such as facilitating familiarity with the hand holding the fishing rod. Japanese Unexamined Patent Publication (Kokai) No. 57-68728 discloses that a rod tube having an elliptical cross section is formed by a manufacturing procedure in which the outer circumference is wound with a prepreg and integrally molded.

In addition, Japanese Patent Application No. 55-30954 discloses a microfilm (Japanese Utility Model Publication No. 56-133869) which discloses a bamboo sword having an oval cross section. Furthermore, for the purpose of improving the strength, a rod tube having an elliptical cross section is used in Japanese Utility Model Publication No. 45-245.
No. 35 publication.

(Problems to be Solved by the Invention) However, the techniques disclosed in the above publications have the following problems.

Although the above-mentioned first publication is a disclosure of a method for manufacturing a rod tube, it is disclosed that a conventional circular cored bar is used, and in order to form a rod tube having an elliptical cross section, a circular cored bar is used. The manufacturing process is complicated because several steps are required such as adding an additional body to the formed circular tubular body. Therefore, the cost of the product is high. In addition, since the attachment body is heavy, a lightweight rod tube cannot be obtained. Furthermore, a structure is adopted in which an appendage shorter than the circular tubular body is provided, and a step is provided between the circular tubular body and the circular tubular body to facilitate the joining of the rod tubes. Aiming to reduce the weight of a rod tube having such a shape, if a fiber reinforced prepreg sheet is used using a cored bar having a shape similar to that of the rod tube, the weight reduction can be achieved. There is a stepped portion whose cross section changes abruptly in the direction, and due to stress concentration on this portion, the strength becomes insufficient as a fishing rod rod on which a large bending force acts.

The other two publications merely disclose that the finished products have an elliptical or oval cross-sectional shape. Even if these products are made by winding a fiber reinforced prepreg sheet around a core metal, It is not easy to manufacture the core metal itself having an elliptical shape or a general oval shape, and the cost is high.

(Purpose of the Invention) Therefore, the present invention is a non-slip and easy-to-grip operability, and it is easy to join the middle rods. It is an object of the present invention to provide a core rod for forming a main rod, which can be wound in a small number of steps to be manufactured, is extremely easy to manufacture, and is low in cost.

(Means for Solving the Problem) In view of the above object, the present invention is a cored bar that winds a fiber reinforced prepreg to form a base rod, and has a cross-sectional outer peripheral shape formed in a gentle taper shape in the longitudinal direction. A front portion that is a circle and a large diameter portion that is formed behind the front portion and that has a larger diameter than a circle at the rear end of the front portion and has an outer peripheral shape is formed, and long sides are formed on both sides of the large diameter portion. A grip portion having a wide flat portion having a substantially constant width along the direction, and a cross-sectional outer peripheral shape formed by a circle or an arc and a straight line, the straight line being on an extension plane of the wide flat portion of the grip portion, The diameter of the circle or the circular arc smoothly expands from the front portion toward the grip portion, and includes a middle portion that connects the front portion and the grip portion. Provide core metal for.

(Operation) Since the front portion, the grip portion, and the intermediate portion have a circular outer peripheral shape in a cross section or a straight line forming a plane with an arc, the cross section is first formed into a circle in manufacturing. Next, by forming a wide flat portion in the grip portion and extending the flat portion to the middle portion to have a gradually reduced width, the core metal can be easily manufactured at low cost.

Due to the existence of the wide flat portion, the base rod manufactured by the core metal thus manufactured has a wide flat portion such that when the grip portion is gripped, the entire fingertip is sufficiently wide as shown in FIG. 6 to be described later. Make sure they come into contact. Further, due to a large change in the curvature of the intersection of the straight line and the circular arc in the cross-sectional shape, a hand is caught, it is hard to slip and the operability is good. Therefore,
Since the grip portion has a large diameter, the operability is excellent, and the operability of the fishing rod is significantly improved. Further, since the front portion of the core metal has a circular cross section, the tip of the manufactured base rod becomes a circular tube, and the operation of joining the middle rod to this tip is extremely easy.

In addition, since the surface of the core metal is formed smoothly without any step portion from the front portion to the middle portion to the grip portion, stress concentration is not exerted on the base rod manufactured by the fiber-reinforced prepreg that can be formed thin. It is possible to obtain a highly practical base rod that is lightweight, durable, and durable.

(Embodiment) Hereinafter, the present invention will be described with reference to an illustrated embodiment. 1 to 3 show a core rod 1 for forming a base rod, and the front part, which is about the front half where the wide flat part 2 is not formed, has a circular cross-sectional outer peripheral shape, The outer diameter thereof changes in a tapered shape so that the cored bar 1 can be easily removed when forming the base rod.

Further, there is a grip portion which is formed at the rear of the front portion and whose outer peripheral shape in cross section is formed by an arc and a straight line as shown in FIG. This arc is formed to have a larger diameter than the diameter of the circle at the rear end of the front portion, and is formed so that the fishing rod can be easily operated when the manufactured rod is gripped. Further, as shown in FIG. 2 and FIG. 3, the width of the flat surface portion 2 in this illustrated example is a width approximately equal to the radius of the arc of the grip portion to form a wide flat surface portion 2. The grip has a substantially constant width.

As shown in the figure, the grip portion and the front portion are smoothly connected by an intermediate portion therebetween. The cross-section outer peripheral shape of this intermediate portion is formed by a circle, an arc, or a straight line, and the straight line is on the extension plane of the wide flat portion 2 of the grip portion, and the diameter of the circle or the circular arc is the forward direction. The front portion and the grip portion are connected to each other by smoothly expanding from the portion toward the grip portion.

The core metal 1 can be formed into a circular outer shape easily and at low cost by a well-known lathe or the like. Then, both sides of the rear large-diameter portion thus formed are easily formed on the wide flat portion 2 described above by well-known milling or the like,
Form the grip at low cost. At this time, since the middle portion smoothly connects the grip portion and the front portion, the outer diameter thereof is formed to be thinner toward the front, and when the flat portion 2 is formed, it is shown in FIG. As described above, both side surfaces thereof are also shaved at the same time, and the front part of the flat surface portion 2 gradually decreases and becomes thinner.

A method of manufacturing the base rod 3 shown in FIGS. 4 to 6 using the core metal 1 will be described with reference to FIG. A liquid release agent in which paraffin wax is dissolved in a solvent such as toluene is applied to the outer periphery of the core rod forming core metal 1 with a brush and dried to form a release agent layer.

A fiber-reinforced prepreg sheet 4 obtained by impregnating a thermosetting synthetic resin such as an epoxy resin, a phenol resin, or a polyester resin into a high-strength fiber sheet such as a carbon fiber, a glass fiber, or a Kepler fiber cut into a quadrangle around its periphery is wound appropriately To be turned. This winding work is performed by rolling the core metal 1 on a workbench. After that, taping is applied to the outside, and it is placed in a heating furnace and subjected to thermosetting treatment according to a conventional method. After this heat curing treatment, the core metal 1 is pulled out from the rear side, and the base rod 3 is manufactured.
In this way, the base rod 3 can be easily manufactured by the operation of winding the fiber-reinforced prepreg sheet 4 around the core metal 1 and curing it.

The grip portion 5 of this easily manufactured base rod 3 is wide and has a wide flat portion 6 having a substantially constant width along the longitudinal direction,
As shown in FIG. 6, its cross-sectional shape is formed by an arc and a straight line, and when it is gripped by the hand, the entire fingertip sufficiently and surely abuts against the wide flat portion 6. Further, due to a large change in the curvature of the intersection of the straight line and the circular arc in the cross-sectional shape, the hand is caught, it is difficult to slip, and the grip becomes easy. Therefore, the operability of the base rod 3, that is, the operability of the fishing rod is remarkably improved together with the grip portion 5 having a large diameter.

Further, since the cored bar 1 has a smooth outer peripheral shape without a sudden change in cross section from the front part to the rear grip part, the base rod 3 made of the fiber reinforced prepreg sheet is thin and lightweight. It will be a strong rod without stress concentration.
Therefore, the operability is further improved in combination with the formation of the wide flat portion 6 for slip prevention.

Furthermore, the front portion of the base rod 3 is a circular tube because the front portion of the cored bar 1 has a circular cross section, and when joining the middle rods in parallel, the joining work can be performed very easily.

In addition, since the wide flat portions 6 are formed on the left and right sides of the base rod 3, the vertical cross section has a long cross-sectional shape, which increases the strength of the swinging down operation of the fishing rod and facilitates the directionality of the fishing rod during the swinging operation. A device can be cast away.

Further, it can be easily and stably pinched to the side.
Furthermore, so that each flat surface portion 6 is located above and below, that is,
When the base rod 3 of FIG. 6 is gripped in the direction in which the base rod 3 is rotated 90 degrees, the flat surface portion 6 of the upper surface can be brought into contact with the lower surface of the gripping arm, and the fishing rod holding Is stable and can be held easily.

In addition, since the base rod 3 has the flat portion 6 formed along the longitudinal direction by the core metal 1, compared to a circular rod tube without this, it prevents accidents such as rolling accidentally and falling into the water. be able to.

The above embodiment is only one embodiment of the present invention, and the present invention is not limited to this.

(Effects of the Invention) As is apparent from the above description, according to the present invention, since the outer peripheral shape of the core metal is formed by a circle, or an arc and a straight line, it is easy and low-cost by a lathe or the like. Can be manufactured by processing.

Further, in the base rod easily manufactured by the core metal, due to the existence of the wide flat portion, the entire fingertip of the hand to be gripped is sufficiently and surely abutted and is hard to slip. Furthermore, since the surface of the core metal has a smooth shape with no steps along the longitudinal direction, it is possible to form a thin and lightweight base rod manufactured by winding a fiber reinforced prepreg around this and to make a step in the longitudinal direction. It has a smooth outer shape and is durable without stress concentration.
Therefore, in addition to the large diameter grip,
Since it is non-slip, lightweight and durable, the operability of the fishing rod is significantly improved.

In addition, since the tip of the base rod is a circular tube, it is extremely easy to join the middle rod. Furthermore, the rod is pinched and held on the side, and the flat portion is supported by contacting the lower surface of the arm. It is also possible to operate various fishing rods easily.

In addition, if the plane of the plane portion of the base rod manufactured by the cored bar according to the present invention is positioned to the left and right to perform the transfer, the cross-sectional shape is long in the vertical direction, so the rod strength of the operation of swinging down the fishing rod is increased, In addition, the directionality of the rod can be easily obtained, and the device can be cast far away.

As described above, the present invention can provide a low-cost core metal that can easily manufacture a base rod having excellent functionality.

[Brief description of drawings]

1 is a plan view of the core rod forming core rod, FIG. 2 is a side view of the core rod, FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1, and FIG. 4 is a core rod of FIG. Fig. 5 is a plan view of the base rod manufactured in Fig. 5, Fig. 5 is a side view of the same, Fig. 6 is a cross-sectional view of the base rod in a state in which the base rod is gripped, and Fig. 7 is an explanatory view of a method of manufacturing the base rod by a core metal is there. 1 ... Core rod for forming a base rod 2 ... Plane portion 3 ... Base rod 4 ... Fiber reinforced prepreg sheet 5 ... Grip portion 6 ... Plane portion

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Claims (1)

[Scope of utility model registration request] 1. A cored bar for winding a fiber reinforced prepreg to form a base rod, the front part having a circular cross-sectional outer peripheral shape formed in a gentle taper shape in the longitudinal direction, and the rear part of the front part. A large-diameter portion is formed that has an outer peripheral shape of a circle having a diameter larger than that of the rear end of the front portion, and wide flat portions having a substantially constant width are formed on both sides of the large-diameter portion along the longitudinal direction. And the cross-section outer peripheral shape is formed by a circle, an arc or a straight line, the straight line being on the extension plane of the wide flat part of the grip part, and the diameter of the circle or the arc is the front. A core rod for forming a base rod, comprising: an intermediate portion connecting the front portion and the grip portion by smoothly expanding from the portion toward the grip portion.