JP7649643B2 - Fishing rod manufacturing method and fishing rod - Google Patents

Description

The present invention relates to a method for manufacturing a fishing rod and to a fishing rod.

2. Description of the Related Art A conventional telescopic fishing rod has a spiral projection provided on the inner peripheral surface of the front end of a rod body (large diameter rod tube) at the base of the rod (see, for example, Patent Document 1).
In a fishing rod with such a structure, when a protrusion is provided on the inner surface of the rod at the butt side of the fitting portion, a resin tape is first wound around a mandrel (core metal) used to manufacture the rod at the butt side. At this time, a protrusion with the desired shape and performance is formed by adjusting conditions such as the width, thickness, and winding lead angle of the resin tape, or the characteristics of the prepreg, and the characteristics of the synthetic resin and reinforcing fibers that make up the prepreg.

Japanese Patent Application Publication No. 10-14450

However, the conventional fishing rods described above are manufactured by winding a narrow resin tape around a tapered core with a specified taper angle. The task of precisely winding the narrow resin tape around the tapered core is a complicated process, which can easily lead to variations in product quality.

In addition, in the conventional technology described in Patent Document 1, the cross section of the protrusion is made trapezoidal, which means that there is a risk of the protrusion being damaged when the rod tube is fixed when casting out the rod, and when the protrusion is released when storing the rod. In particular, there remains a possibility of damage due to foreign matter such as seawater that gets mixed in during use when fixing and releasing the rod tube, and there is room for improvement in terms of the fixation of the rod body between the large diameter rod tube and the small diameter rod tube.

The present invention has been made in consideration of the above circumstances, and its purpose is to provide a fishing rod and a manufacturing method thereof that can reduce quality variation during manufacturing and enable smooth fastening and unfastening without damaging the rod body.

(1) The fishing rod according to the present invention is a fishing rod in which the inner peripheral surface of the front end of a large diameter rod tube and the outer peripheral surface of the rear end of a small diameter rod tube are joined so as to be freely fitted together, the inner peripheral surface of the front end of the large diameter rod tube is provided with a tapered portion that is inclined with respect to the rod axis of the large diameter rod tube, and a step portion formed in a spiral shape is provided along the inner peripheral surface of the tapered portion, the step portion has a first step surface that extends in a direction intersecting with the rod axis of the large diameter rod tube and faces the rear end side of the large diameter rod tube, and a second step surface that extends from the outer peripheral end of the first step surface toward the rear end side and faces the rod axis, and is characterized in that in a cross section of the large diameter rod tube that includes the rod axis, a plurality of the step portions are continuously arranged along the rod axis direction.

According to the fishing rod of the present invention, the step portion is continuously provided along the taper in the tapering direction, so that the front end inner peripheral surface of the large diameter rod tube and the rear end outer peripheral surface of the small diameter rod tube can be smoothly fixed and released. In other words, since the step portion provided on the large diameter rod tube is only on one side of the first step surface facing the rear end side in the rod axis direction, damage that occurs during the above-mentioned fixing and release can be suppressed compared to the conventional case in which the step surface facing the rod axis direction has a protrusion on both the front end side and the rear end side.
In addition, in the present invention, since the step portion is formed in a spiral shape, foreign matter such as seawater cannot become caught between the inner surface of the front end of the large diameter rod tube and the outer surface of the rear end of the small diameter rod tube, the female side of the large diameter rod tube and the male side of the small diameter rod tube can be securely joined, and further, the male side and female side can be prevented from becoming stuck to each other.

When manufacturing the fishing rod according to the present invention, for example, a resin film is wound around a stepped core bar in an overlapping manner and then fired, thereby forming a spiral step portion on the tapered portion of the inner peripheral surface of the front end of the large diameter rod tube. Therefore, the taper angle of the step portion formed on the inner peripheral surface of the front end of the large diameter rod tube can be set by the winding angle and number of windings of the overlapping resin film, and further the lead angle, spacing, and number of steps of the spiral step portion can be appropriately set, allowing for flexibility in the product as a fishing rod.

Furthermore, when manufacturing fishing rods, it is possible to wrap and sinter a resin film around the stepped core as described above in an overlapping manner, and since it can be manufactured by wrapping a planar resin film around the same diameter part of the core, the work process is simplified and quality variation can be reduced compared to the conventional method of winding the film in a spiral shape with gaps between them.

(2) The fishing rod manufacturing method of the present invention is a fishing rod manufactured using a stepped core having a small diameter portion with a circumferential surface parallel to the axial direction, a step portion extending from the rear end of the small diameter portion in a direction perpendicular to the axial direction, and an expanded diameter portion expanding rearward from the maximum diameter end of the step portion at a predetermined taper angle with respect to the axial direction, the fishing rod is characterized by having a process of overlapping a resin film on the small diameter portion and winding it up to the maximum diameter of the step portion, a process of winding a prepreg around the resin film and the expanded diameter portion, a process of baking the resin film and the prepreg, a process of pulling out the hardened resin film and the prepreg from the stepped core after baking, and a process of peeling the resin film from the prepreg.

According to the fishing rod manufacturing method of the present invention, a step portion is provided along the taper in the tapering direction, so that the step portion is formed in the prepreg, and the front end inner peripheral surface of one rod tube and the rear end outer peripheral surface of the other rod tube to be joined can be smoothly fixed and released. In other words, since the step surface facing the rod axis direction of the step portion provided on one rod tube manufactured by the manufacturing method of the present invention is only in one direction facing the rear end, it is possible to suppress damage and the like that occurs during the above-mentioned fixing and releasing, compared to the conventional case in which the step surface facing the rod axis direction has a protrusion on both the front end side and the rear end side.
Furthermore, in the present invention, the manufactured fishing rod has a spirally formed step portion, so that foreign matter such as seawater cannot get caught between the inner surface of the front end of one rod tube and the outer surface of the rear end of the other rod tube, allowing the two rod tubes to be securely joined together and preventing the joined rod tubes from sticking together.

In addition, in the fishing rod manufacturing method according to the present invention, a resin film is wound around a stepped core metal in an overlapping manner and then baked, thereby forming a spiral step portion on the tapered portion of the inner peripheral surface of the front end of one of the rod tubes to be joined. Therefore, the taper angle of the step portion formed on the inner peripheral surface of the front end of one of the rod tubes can be set by the winding angle and number of windings of the overlapping resin film, and further the lead angle, spacing, and number of steps of the spiral step portion can be appropriately set, allowing for flexibility in the product as a fishing rod.

Furthermore, when manufacturing fishing rods, it is possible to wrap and sinter a resin film around the stepped core as described above in an overlapping manner, and since it can be manufactured by wrapping a planar resin film around the same diameter part of the core, the work process is simplified and quality variation can be reduced compared to the conventional method of winding the film in a spiral shape with gaps between them.

(3) The resin film may be formed into a single plane having a straight side and an inclined side extending at an acute angle from one end of the straight side, and when the resin film is overlapped and wound around the small diameter portion, the straight side of the resin film may be parallel to the axial direction, and the inclined side may be arranged so as to extend obliquely from the front end side to the rear end side in the axial direction.

The fishing rod manufacturing method of the present invention allows a single resin film with an inclined edge to be arranged with its straight edge parallel to the axial direction of the stepped core bar, and then wrapped around the stepped portion of the stepped core bar, forming a stepped portion with a constant gap and no variation, improving product quality.

According to the fishing rod manufacturing method and fishing rod of the present invention, it is possible to reduce the variation in quality during manufacturing, and to smoothly fasten and release the rod body without damaging it.

FIG. 2 is a side view showing a fitting portion between a large diameter rod tube and a small diameter rod tube in a telescopic rod according to an embodiment of the present invention. FIG. 2 is a horizontal cross-sectional view passing through the rod shaft of the telescopic rod shown in FIG. 1. FIG. 4 is a horizontal cross-sectional view showing the configuration of the front end portion of the large diameter rod pipe. FIG. 1 is a diagram for explaining the manufacturing process of a telescopic rod. FIG. 5 is a diagram for explaining the manufacturing process of the telescopic rod following FIG. 4. FIG. 6 is a diagram for explaining the manufacturing process of the telescopic rod following FIG. 5 . FIG. 7 is a diagram for explaining the manufacturing process of the telescopic rod following FIG. 6. FIG. 8 is a diagram for explaining the manufacturing process of the telescopic rod following FIG. 7.

Hereinafter, a fishing rod manufacturing method and a fishing rod according to the present invention will be described with reference to the drawings. Note that in each drawing, the scale of each component may be appropriately changed as necessary to make each component large enough to be visible.

As shown in Figures 1 and 2, the telescopic rod 1 (fishing rod) of this embodiment is applied to a telescopic fishing rod in which multiple tapered rod tubes are connected and the front end inner surface 2a of the large diameter rod tube 2 at the base of the rod and the rear end outer surface 3a of the small diameter rod tube 3 at the tip of the rod are joined so as to be freely fitted together.

When the telescopic fishing rod 1 is in use, the small diameter rod tube 3 extends from the front end 2b of the large diameter rod tube 2, and the rear end of the small diameter rod tube 3 is fixed to the front end 2b of the large diameter rod tube 2. When not in use, the small diameter rod tube 3 is stored in a tubular state within the large diameter rod tube 2. Although the large diameter rod tube 2 and the small diameter rod tube 3 are shown as a pair in Figures 1 and 2, the telescopic fishing rod 1 is configured so that the diameters of the multiple rod tubes become smaller in succession as they approach the front end.
The telescopic rod 1 can be provided with a fishing line guide (not shown) as required, and a reel can be provided on the rod body at the handle side as required.

In this embodiment, the circumferential direction is defined as the direction that rotates around the rod axis O, which is the central axis of the telescopic rod 1.

The large diameter rod 2 and the small diameter rod 3 are each a cylindrical rod made of resin formed by laminating multiple layers of prepreg 6 (see Figure 8) in which a large number of reinforcing fibers are embedded.

A male tapered section 31 is formed on the outer peripheral surface 3a of the rear end of the small diameter rod 3, the diameter of which gradually decreases from the rear end 3b toward the front end. The male tapered section 31 is connected to a straight section 32 whose outer diameter does not change at the front end side of the male tapered section 31.

As shown in FIG. 3, the large diameter rod 2 is a tapered cylinder with a female tapered section 21 that gradually expands in diameter from the front end 2b to the rear end. A step section 22 that spirals from the front end 2b to the rear end of the large diameter rod 2 is formed along the female tapered section 21. The female tapered section 21 is connected to a straight section (not shown) whose inner diameter does not change at the rear end side of the female tapered section 21. As shown in FIG. 2, the female tapered section 21 is set to be longer in the length dimension in the rod axis O direction than the male tapered section 31 of the small diameter rod 3.

As shown in FIG. 3, the female taper portion 21 (two-dot chain line in FIG. 3) is a virtual taper portion because the step portion 22 is formed as described above. In other words, in a side cross-sectional view passing through the rod axis O, the straight line connecting the inner ends of the step portions 22 (the inner ends 22a of the first step surface 22A) positioned with a gap in the direction of the rod axis O is defined as the female taper portion 21.

As shown in Figures 1 and 2, when the large diameter rod 2 and the small diameter rod 3 are fitted together by taper fitting, the fitting portion P is set so that the inner diameter of the front end inner surface 2a of the large diameter rod 2 is smaller than the outer diameter of the rear end outer surface 3a of the small diameter rod 3, so that the small diameter rod 3 does not slip out of the large diameter rod 2.

The taper angle of the female taper portion 21 is set to be the same as the taper angle of the male taper portion 31. When the small diameter rod pipe 3 is extended and fitted into the large diameter rod pipe 2, the female taper portion 21 of the large diameter rod pipe 2 and the male taper portion 31 of the small diameter rod pipe 3 are in contact with each other.
The taper angle of the female taper portion 21 and the taper angle of the male taper portion 31 are each, for example, about 2.0/1000.

As shown in FIG. 3, the large diameter rod tube 2 has a plurality of step portions 22 arranged continuously along the rod axis O in a vertical cross section passing through the rod axis O, forming a staircase shape. The step portions 22 have a first step surface 22A that extends in a direction intersecting with the rod axis O and faces the rear end of the large diameter rod tube 2, and a second step surface 22B that extends from the outer circumferential end of the first step surface 22A toward the rear end and faces the rod axis O. In other words, the front end inner peripheral surface 2a of the large diameter rod tube 2 has a shape in which the first step surface 22A and the second step surface 22B are alternately provided along the rod axis O.

Specifically, as shown in FIG. 2, at the mating portion P between the small diameter rod 3 and the large diameter rod 2, only the inner end apex 22b of the first step surface 22A of the step portion 22 of the female taper portion 21 contacts the male taper portion 31. The female taper portion 21 has a clearance portion 24 (see FIG. 3) that is located radially outward of the female taper portion 21 and does not contact the male taper portion 31. The clearance portion 24 is the first step surface 22A and the second step surface 22B that constitute the step portion 22. In other words, at the mating portion P, the male taper portion 31 is in line contact with the female taper portion 21 so as to draw a spiral.

The helical angle (lead angle) of the step portion 22 formed in a helical shape can be easily changed by changing the shape of the resin film 5 and the number of turns in the manufacturing method of the telescopic fishing rod 1 described later.

Next, a method for manufacturing the above-mentioned telescopic fishing rod 1 will be specifically described with reference to the drawings.
As shown in FIG. 4, in the manufacturing method of this embodiment, a stepped core bar 4 is used to manufacture the telescopic fishing rod 1 (see FIGS. 1 and 2).
The stepped core bar 4 used has a small diameter portion 41 having a peripheral surface parallel to the axis C, a step portion 42 extending perpendicular to the axis C from the rear end 41a of the small diameter portion 41, and an expanded diameter portion 43 which expands in diameter rearward from the maximum diameter end 42a of the step portion 42 at a predetermined taper angle relative to the axis C.

First, as shown in Figures 4 and 5, the resin film 5 is overlapped on the small diameter portion 41 and wound around from the front end 41b of the small diameter portion 41 to the maximum diameter end 42a of the step portion 42.

The resin film 5 used here is, for example, a PP (polypropylene) film. The thickness of the PP film is mainly 22 μm, but 25 μm, 30 μm, etc. can also be used. The conditions of the resin film 5, such as the shape, thickness, and winding lead angle, are set according to the desired taper angle and size of the step portion 22 in the female taper portion 21 to be formed on the front end inner surface 2a (see Figure 3) of the large diameter rod 2 described above. In other words, by adjusting the above conditions of the resin film 5, a step portion 22 of the desired shape can be obtained on the front end inner surface 2a of the large diameter rod 2.

As shown in FIG. 4, the resin film 5 used is formed in the shape of a single plane having a straight side 51 and an inclined side 52 extending at an acute angle from one end (front end apex 51a) of the straight side 51.
The resin film 5 is placed over the small diameter portion 41 of the stepped core 4 in an orientation R before it is wrapped around the small diameter portion 41 of the stepped core 4, with the straight side 51 of the resin film 5 parallel to the axis C and the inclined side 52 positioned in the direction of the axis C from the front end 41b side to the diagonal rear end side of the small diameter portion 41 of the stepped core 4.

By winding the resin film 5 around the small diameter portion 41 after placing it in the above-mentioned orientation R, a spiral step portion 5a is formed on the outer circumferential surface of the wound resin film 5, as shown in FIG. 5.

6, prepreg 6 is wound around resin film 5 wound around small diameter portion 41 and enlarged diameter portion 43. As the prepreg 6, a general reinforced plastic molding material is used, which is made by uniformly impregnating a fibrous reinforcing material such as glass cloth or carbon fiber with a thermosetting resin such as epoxy and then heating or drying it to a semi-cured state.
Thereafter, the resin film 5 and the prepreg 6 wrapped around the stepped core 4 are fired.

After the baking, the baked and hardened resin film 5 and prepreg 6 are pulled out from the stepped core 4 as shown in FIG.
Then, in the final step, the resin film 5 is peeled off from the prepreg 6 as shown in FIGS.
As a result, a female tapered portion 21 with an appropriate taper is formed on the inner peripheral surface 2a of the front end of the large diameter rod pipe 2 as shown in FIG. 3, and a spiral step portion 22 (a step portion indicated by the symbol 61 in FIG. 8) is formed in this female tapered portion 21.

Next, the operation of the fishing rod and the method for manufacturing the fishing rod thus constructed will be explained in detail with reference to the drawings.

In this embodiment, as shown in Figures 1 to 3, a step portion 22 is provided along the taper in the tapering direction, so that the front end inner peripheral surface 2a of the large diameter rod tube 2 and the rear end outer peripheral surface 3a of the small diameter rod tube 3 can be smoothly fixed and released. In other words, since the step portion 22 provided on the large diameter rod tube 2 is only in one direction, the first step surface 22A facing the rear end side in the rod axis O direction, damage that occurs during the above-mentioned fixing and release can be suppressed compared to the conventional case in which the step surface facing the rod axis direction has a protrusion on both the front end side and the rear end side.

In addition, in this embodiment, the step portion 22 is formed in a spiral shape, so that foreign matter such as seawater does not get caught between the front end inner surface 2a of the large diameter rod 2 and the rear end outer surface 3a of the small diameter rod 3, and the female side of the large diameter rod 2 and the male side of the small diameter rod 3 can be reliably joined, and the male side and female side can be prevented from becoming stuck together.

Furthermore, when manufacturing the telescopic fishing rod 1 in this embodiment, a resin film 5 can be wound around a stepped core 4 in an overlapping manner and then fired, as shown in Figure 5, to form a spiral step portion 22 in the tapered portion of the inner surface 2a of the front end of the large diameter rod tube 2.
Therefore, the taper angle of the step portion 22 formed on the inner surface 2a of the front end of the large diameter rod tube 2 can be set by adjusting the winding angle and the number of windings of the overlapping resin film 5, and further the lead angle, spacing and number of steps of the spiral step portion 22 can be appropriately set, allowing for flexibility in the product as a fishing rod.

Furthermore, when manufacturing the telescopic fishing rod 1, it is possible to wrap the resin film 5 around the stepped core 4 as described above in an overlapping manner and then sinter it. Since it can be manufactured by wrapping the planar resin film 5 around the same diameter portion of the stepped core 4, the work process is simplified and quality variation can be reduced compared to the conventional method of winding it in a spiral shape with gaps between each other.

In addition, in this embodiment, as shown in FIG. 4, a single resin film 5 having an inclined edge 52 is arranged with its straight edge 51 parallel to the axis C of the stepped core 4, and is then wrapped around the stepped portion 42 of the stepped core 4, thereby forming a stepped portion 42 with a constant spacing and no variation, thereby improving product quality.

The telescopic rod 1 and the manufacturing method for the telescopic rod 1 according to this embodiment configured as described above can reduce the variation in quality during manufacturing, and can be attached and detached smoothly without damaging the rod body.

Although the embodiments of the fishing rod and the method of manufacturing the fishing rod according to the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. The embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. The embodiments and their variations include, for example, those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the scope of equivalents.

For example, in the above embodiment, in the manufacturing method of the telescopic fishing rod 1, the shape of the resin film 5 wound around the small diameter portion 41 of the stepped core 4 is a single plane having a straight edge 51 and an inclined edge 52, but the shape of the resin film 5 is not limited to this. For example, a strip-shaped resin film may be used. In the case of this strip-shaped resin film, the step portion 22 can be formed by overlapping the strips without leaving any gaps in the direction of the rod axis O and winding them in a spiral shape.

1 Telescopic fishing rod
2 Large diameter rod 2a Front end inner peripheral surface 3 Small diameter rod 3a Rear end outer peripheral surface 4 Stepped core metal 5 Resin film 6 Prepreg 21 Female tapered portion 22 Step portion 22A First step surface 22B Second step surface 24 Relief portion 31 Male tapered portion 41 Small diameter portion 42 Step portion 43 Enlarged diameter portion 51 Straight side 52 Inclined side C Axis line O Rod shaft

Claims (2)

a small diameter portion having a peripheral surface parallel to an axial direction;
a step portion extending from a rear end of the small diameter portion in a direction perpendicular to the axial direction;
an expanded diameter portion that expands rearward from a maximum diameter end of the step portion at a predetermined taper angle with respect to the axial direction;
A method for manufacturing a large-diameter rod of a fishing rod in which an inner peripheral surface of a front end of a large-diameter rod and an outer peripheral surface of a rear end of a small-diameter rod are joined so as to be freely fitted together, comprising:
A step of overlapping the resin film itself on the small diameter portion and winding it up to the maximum diameter of the step portion;
a step of winding a prepreg around the resin film and the expanded diameter portion;
baking the resin film and the prepreg;
a step of extracting the cured resin film and the prepreg from the stepped core;
peeling the resin film from the prepreg;
having
the resin film is formed in a single plane having a straight side and an inclined side extending at an acute angle from one end of the straight side,
When the resin film is overlapped and wound around the small diameter portion, the straight side of the resin film is parallel to the axial direction, and the inclined side is disposed so as to extend from the front end side to the oblique rear end side in the axial direction,
a first step portion of the resin film overlapped and wound on the small diameter portion and a second step portion of the prepreg wound around the resin film are formed to have the same step shape,
The second step portion has a first step surface extending in a direction intersecting with the rod axis of the large diameter rod tube and facing the rear end side of the large diameter rod tube, and a second step surface extending from an outer circumferential end of the first step surface toward the rear end side and facing the rod axis,
A method for manufacturing a fishing rod, wherein a plurality of the second step portions are continuously arranged along the rod shaft direction in a cross section of the large diameter rod tube including the rod shaft. In a fishing rod in which a front end inner peripheral surface of a large diameter rod tube and a rear end outer peripheral surface of a small diameter rod tube are joined so as to be freely fitted together,
A tapered portion inclined with respect to the rod axis of the large diameter rod is provided on an inner peripheral surface of the front end side of the large diameter rod, and a step portion formed in a spiral shape is provided along the inner peripheral surface of the tapered portion,
The step portion has a first step surface extending in a direction intersecting with the rod shaft of the large diameter rod tube and facing the rear end side of the large diameter rod tube, and a second step surface extending from an outer circumferential end of the first step surface toward the rear end side and facing the rod shaft,
A fishing rod in which, in a cross section of the large diameter rod tube including the rod shaft, the second step portions of the plurality of step portions are continuously arranged in a spiral shape along the rod shaft direction.

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