JP6704650B2 - Butt plug for fishing rod and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure of a buttocks attached to a fishing rod and a manufacturing method thereof.

Generally, a fishing rod is composed of a plurality of blanks having different outer diameters, and each blank is called a "knot". The outer diameter of the node forming the tip is the smallest, the node is referred to as the "first node", and the node adjacent to the first node is referred to as the "second node". Similarly, the section adjacent to the second section is referred to as the third section, and is sequentially referred to as the fourth section, the fifth section, and the like. The outer diameter of each node increases in order from the first node, and the node with the largest outer diameter is called the "source node", and the node adjacent to the source node is called the "source node". There is also. The lunar joint is a joint held by a fisherman, and is provided with a grip so that the fisherman can easily grasp the lunar joint. When the fishing reel is mounted, the reel seat is provided at the former section. A tail plug is provided at the rear end of the base node (see, for example, Patent Documents 1 and 2) to prevent water from entering the nodes or dust from entering the nodes.

In particular, the total rod is a fishing rod without a reel seat, and the fishing tackle is directly connected to the tip of the first section. Therefore, when the target hits in actual fishing, a tensile force and a bending moment act on the total rod at the same time, which makes the fishing man who operates the total rod physically heavy, but very exciting. On the other hand, in the case of an extended rod, when the target hits, the pulling force and the bending moment act directly as described above, so the fisherman's carelessness causes the extended rod to be hit by the hit target in actual fishing. There is a fear. Especially if the target is a large fish. In order to avoid such inconvenience, conventionally, in actual fishing, even if the tail rope is connected to the above-mentioned stopper, and the total rod is caught, the fisherman pulls the tail rope and pulls the total length. Can be recovered.

FIG. 17 is a perspective view of a conventional buttocks. As shown in the figure, the butt plug 1 includes a shaft portion 2 and a head portion 3, and the shaft portion 2 is screwed and fixed to the rear end of the former node. A connecting pin 4 is provided upright in the center of the head 3, and a ring 5 is engaged with the connecting pin 4. The tail rope is connected to this ring 5. The butt plug disclosed in Patent Document 2 is of a type in which the butt rope is not connected.

JP 2012-130281 A JP2012-217380A

The conventional butt plug has the shaft portion 2 and the head portion 3, the connecting pin 4, and the ring 5 as described above, and has a large number of parts. Therefore, the number of processing steps for each component is large, the assembly process is complicated, and the manufacturing cost is increased. On the other hand, when the butt plug 1 is attached to the total rod and a large fish is assumed as the target, it is necessary to secure the mechanical strength of the ring 5 and the connecting pin 4 and the connecting strength between the head 3 and the connecting pin 4. There is. However, there is a problem that the design is not easy in order to achieve sufficient strength with the conventional structure of the butt plug 1. Although the butt plug disclosed in Patent Document 1 has a structure in which a connecting bar is bridged inside the butt plug, even with such a structure, the number of parts is still large and sufficient mechanical strength cannot be secured. There is a problem that it is not easy.

The present invention has been made on the basis of such a background, and an object thereof is a butt plug for a fishing rod, which has a simple structure while being capable of connecting a butt rope, and exhibits sufficient mechanical strength, and a method for manufacturing the butt plug. Is to provide.

(1) The butt plug for a fishing rod according to the present invention,
An abutment plug for a fishing rod, which is detachably provided at the rear end portion of the base joint, and has a front end and a rear end opened, and the front end side extends from the front end side to the rear end portion of the base joint along the axial direction of the base joint. And a tubular plug body that is attached to the plug body and is integrally formed at the rear end of the plug body, and bulges rearward from the plug body so as to form a predetermined gap between the plug body and the plug body. And a bridge portion spanning in the radial direction.

According to this configuration, since the plug body and the bridge portion are integrally formed, the fishing rod buttocks can be composed of a single component. Therefore, the bridge portion has improved mechanical strength against external force. Moreover, since the bridge portion has a shape spanning the plug body in the radial direction, it can be formed by known simple processing such as forging or cutting, and the design and processing of the wall thickness dimension of the bridge portion, etc. Is easy.

(2) It is preferable that the plug body includes a tubular body having an outer diameter corresponding to the inner diameter of the base node, and a flange formed at a rear end portion of the tubular body.

According to this structure, the plug body is screwed into the inside of the former node. When the plug body is attached to the base segment, the flange abuts the rear end face of the base segment and covers at least a part of the rear end face of the base segment. For this reason, the design of the rear end of the lunar segment is refined.

(3) It is preferable that the bridge portion is smoothly curved.

According to this configuration, since the bridge portion is curved, the mechanical strength of the bridge portion, particularly the mechanical strength against an external force in the axial direction is improved.

(4) It is preferable that the side surface of the bridge portion extends while smoothly curving gradually from the inward direction orthogonal to the radial direction to the rear side.

According to this configuration, since the side surface of the bridge portion extends while curving, the mechanical strength of the bridge portion against an external force in a direction intersecting the axial direction is improved. In addition, the design of the side of the bridge is also sophisticated.

(5) The side surface of the bridge portion extends gradually from the inward direction orthogonal to the radial direction to the rear side while being bent at a boundary line extending along a direction orthogonal to the axial direction. Is preferred.

According to this configuration, since the side surface of the bridge portion extends while being bent, the mechanical strength of the bridge portion against an external force in a direction intersecting the axial direction is improved. In addition, the design of the side of the bridge is also sophisticated.

(6) It is preferable that the front surface of the bridge section that defines the gap extends while curving smoothly.

According to this configuration, since the front surface of the bridge portion is a curved surface, stress concentration is avoided and mechanical strength is improved. Also, the design of the bridge will be refined.

(7) It is preferable that a central portion of the front surface of the bridge portion that defines the gap extends straight in the radial direction.

According to this structure, since the central portion of the front surface of the bridge portion is flat, the front surface of the bridge portion can be processed relatively easily.

(8) It is preferable that the plug body has a cylindrical shape, and an abutting plate is provided at the front end.

According to this structure, since the contact plate is provided, when the plurality of knots forming the fishing rod are moved rearward to bring the fishing rod into the stored state, the knot contacts the contact plate. Therefore, when the extended fishing rod is stored, the joints of the nodes are easily disengaged. Therefore, the fishing rod can be easily stored.

(9) A method for manufacturing a fishing rod butt plug according to the present invention is a method for manufacturing a fishing rod butt plug that is detachably provided at a rear end portion of a base node, and is a columnar body having a front surface, a rear surface, and a peripheral surface. A piercing step of piercing from the front surface so as to leave the rear surface with the axial center as a center, and two symmetrical portions of the rear end portion of the columnar body that are radially separated from each other with respect to the axial center. Is cut along the radial direction of the columnar body so as to communicate with the recess formed by the punching step .

According to this structure, the columnar body is axially perforated from the front surface to the rear surface in the perforation step. That is, the columnar body is provided with a concave portion opening to the front surface thereof, and the columnar body is processed into a bottomed tubular shape. This recess does not penetrate the columnar body but extends to the rear end of the columnar body. Further, the two symmetrical portions of the rear end portion of the columnar body are cut by the cutting process. As a result, only the central portion of the rear end is left. By cutting the two symmetrical portions, the recess penetrates the columnar body. The central portion of the columnar body constitutes a bridge portion which bulges backward and is bridged in the radial direction. The front part of the columnar body constitutes a stopper main body of the fishing rod buttocks and has a tubular shape. The plug body and the bridge portion are integrally formed, and the fishing rod buttocks are composed of a single component. Therefore, the bridge portion has improved mechanical strength against external force.

(10) Before the punching step, it is preferable to include a post-forming step of cutting the rear end portion of the columnar body to form a convex curved surface where the rear surface and the peripheral surface are smoothly continuous.

According to this structure, the outer surface of the bridge portion becomes a curved surface, and the mechanical strength of the bridge portion is improved.

(11) It is preferable to include an attaching step of attaching the contact plate to the front end portion of the columnar body after the cutting step.

According to this structure, the abutment plate is provided on the buttocks. Therefore, when a plurality of nodes forming the fishing rod are moved rearward to bring the fishing rod into the stored state, the nodes come into contact with the contact plate. Therefore, when the extended fishing rod is stored, the joints of the nodes are easily disengaged. Therefore, the fishing rod can be easily stored.

(12) The method for manufacturing a fishing rod butt plug according to the present invention is a method for manufacturing a fishing rod butt plug detachably provided at a rear end portion of a former node, the columnar body having a front surface, a rear surface, and a peripheral surface. A cutting step of cutting two symmetrical portions of the rear end portion, which are radially separated from each other with respect to the axis of the columnar body, along the radial direction of the columnar body; around the, sea urchin by forming a recess residue was and opened forward to the rear surface, and a boring step of perforating the said front.

According to this configuration, the two symmetrical portions of the rear end portion of the columnar body are radially cut by the cutting process. As a result, only the central portion of the rear end is left. By the perforation step, the columnar body is axially perforated from the front surface to the rear surface thereof. That is, the columnar body is formed with a concave portion opening to the front surface thereof. The recess is formed so as to penetrate the columnar body in the axial direction and leave the rear surface. As a result, the front portion of the columnar body is processed into a tubular shape, and the central portion constitutes a bridge portion that bulges rearward from the front portion of the columnar body and is bridged in the radial direction. The front part of the columnar body constitutes a stopper main body of the fishing rod buttocks and has a tubular shape. The plug body and the bridge portion are integrally formed, and the fishing rod buttocks are composed of a single component. Therefore, the bridge portion has improved mechanical strength against external force.

(13) Before the cutting step, it is preferable to include a post-forming step of cutting the rear end of the columnar body to form a convex curved surface where the rear surface and the peripheral surface are smoothly continuous.

According to this structure, the outer surface of the bridge portion becomes a curved surface, and the mechanical strength of the bridge portion is improved.

(14) It is preferable to include an attaching step of attaching the contact plate to the front end portion of the columnar body after the punching step.

According to this structure, the abutment plate is provided on the buttocks. Therefore, when a plurality of nodes forming the fishing rod are moved rearward to bring the fishing rod into the stored state, the nodes come into contact with the contact plate. Therefore, when the extended fishing rod is stored, the joints of the nodes are easily disengaged. Therefore, the fishing rod can be easily stored.

ADVANTAGE OF THE INVENTION According to this invention, the butt plug for fishing rods which has a simple structure, although a butt rope can be connected, and exhibits sufficient mechanical strength, and its manufacturing method are provided.

FIG. 1 is a side view of a fishing rod provided with a buttocks according to the first embodiment of the present invention. FIG. 2 is a side view of the rear end portion of the former node provided with the buttocks according to the first embodiment of the present invention. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is an exploded perspective view of the buttocks according to the first embodiment of the present invention. FIG. 5 is a rear view of the stopper body and the bridge portion of the buttocks according to the first embodiment of the present invention. FIG. 6 is a front view of the stopper main body and the bridge portion of the buttocks according to the first embodiment of the present invention. FIG. 7 is a sectional view taken along line VII-VII in FIG. FIG. 8 is a sectional view taken along line VIII-VIII of FIG. FIG. 9 is a diagram showing a method of manufacturing a buttocks according to the first embodiment of the present invention. In particular, FIG. 9A shows a columnar body as a material, and FIG. 9B shows a post-forming step. Show. FIG. 10 is a diagram showing a method for manufacturing a buttocks according to the first embodiment of the present invention. In particular, FIG. 10( a) shows a pre-forming step, and FIG. 10( b) shows a piercing step. 10(c) shows a cutting process. FIG. 11 is a diagram showing a method for manufacturing a buttocks according to the second embodiment of the present invention. In particular, FIG. 11A shows a columnar body as a material, and FIG. 11B shows a post-forming step. Show. FIG. 12 is a diagram showing a method for manufacturing a buttocks according to the second embodiment of the present invention. In particular, FIG. 12(a) shows a pre-forming step, FIG. 12(b) shows a cutting step, and FIG. 12(c) shows a perforation process. FIG. 13 is a perspective view of a stopper body and a bridge portion of the buttocks according to the second embodiment of the present invention. FIG. 14 is a vertical cross-sectional view of the stopper main body and the bridge portion of the buttocks according to the second embodiment of the present invention. FIG. 15 is a perspective view of a stopper body and a bridge portion of a buttocks according to the third embodiment of the present invention. FIG. 16 is a partial vertical cross-sectional side view of the stopper body and the bridge portion of the buttocks according to the third embodiment of the present invention. FIG. 17 is a perspective view of an example of a conventional buttocks having a ring for the buttocks rope.

Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings as appropriate.

[First embodiment of butt plug]

FIG. 1 is a side view of a fishing rod 20 including a buttocks 29 according to the first embodiment of the present invention. The fishing rod 20 is composed of five blanks 21 to 25 having different outer diameters, and is assembled in a so-called swing-out type. Each of the blanks 21 to 25 is referred to as a “node” and is referred to as a first node 21 to a fifth node 25 in order of decreasing outer diameter. No. 1 node is a node that constitutes the tip and has the smallest outer diameter. The fifth node 25 is particularly referred to as a "source node", and the fourth node 24 adjacent to the source node is particularly referred to as a "source node". In this embodiment, the fishing rod 20 is what is called a so-called total rod, and is used, for example, for mountain streams.

Each section 21 to 25 is constructed in a known manner. For example, the carbon prepreg is cut into a predetermined shape, and the carbon prepreg is wound into a tubular shape and heat-treated, so that the cylindrical nodes 21 to 25 are fired. The first section 21 is housed inside the second section 22 so as to be freely drawn out. A top member 26 to which the fishing line is connected is provided at the tip of the first joint 21. Since the structure of the top member 26 is known, detailed description thereof will be omitted.

The first joint 21 is formed in a tapered shape as a whole, and is formed such that the outer diameter of the rear end portion is larger than the outer diameter of the front end portion thereof. Further, the rear end diameter of the first joint 21 is set to be larger than the front end diameter of the second joint 22. Therefore, when the first barb 21 is pulled out from the second barb 22, the rear end portion of the first barb 21 is meshed with the front end portion of the second barb 22 by a predetermined dimension ( It is fitted inside), so that both are fixed. The relationship between the second node 22 and the third node 23, the relationship between the third node 23 and the former node 24, and the relationship between the former node 24 and the former node 25 are also the first node 21. Is the same as the relation between No. 2 and No. 22.

FIG. 2 is a side view of the rear end portion 25a of the base joint 25 provided with a butt plug 29 (corresponding to the “butt plug for a fishing rod” described in the claims). FIG. 3 is a sectional view taken along the line III-III in FIG. As shown in FIG. 2 and FIG. 3, the base link 25 includes a cylindrical base link main body 27 and a cylindrical grip member 28 provided on the outer peripheral surface of the rear part of the base link main body 27. A tail plug 29 is provided at the rear end portion 25a of the base joint 25, more specifically, at the rear end portion of the base joint main body 27.

The butt plug 29 is attached to the base link 25 such that the axis of the butt plug 29 coincides with the axis of the base link 25. The directions of the two axes coincide with the axial direction of the base joint 25 and the axial direction of the buttocks 29. Reference numeral 34 is attached to this axial direction. Further, the radial direction of the base joint 25 and the radial direction of the buttocks 29 are also the same, and in particular, the posture of the buttocks 29 is defined by using two radial directions that are orthogonal to each other. These two radial directions are a first radial direction 35 and a second radial direction 36 orthogonal to the first radial direction 35.

FIG. 4 is an exploded perspective view of the butt plug 29. As shown in FIGS. 3 and 4, the butt plug 29 includes a plug body 30, a bridge portion 40, a contact plate 50, and an O-ring 37. The plug body 30 has a front end 30a and a rear end 30b. The bridge portion 40 is integrally formed with the rear end 30b of the plug body 30. The contact plate 50 is provided at the front end 30a of the plug body 30. As will be described later in detail, the first radial direction 35 is the direction in which the bridge portion 40 extends. In addition, in FIG. 4, the contact plate 50 is separated from the stopper body 30 and the bridge portion 40.

The plug body 30 includes a tubular body 31 and a flange 32. Therefore, the plug body 30 has the inner peripheral surface 33. The outer diameter of the cylindrical body 31 corresponds to the inner diameter of the former joint 25 (inner diameter of the former joint main body 27). The flange 32 is formed at the rear end of the tubular body 31. As shown in FIG. 3, the tubular body 31 can be inserted into the base joint 25. Further, the flange 32 covers the rear end surface of the former joint body 27, but does not cover the rear end surface of the grip member 28. That is, in the present embodiment, the outer diameter of the flange 32 is substantially equal to the outer diameter of the former node main body 27.

As shown in FIGS. 3 and 4, a male screw 31a and a peripheral groove 31b are formed on the outer peripheral surface of the cylindrical body 31. The circumferential groove 31b is located at the rear end of the tubular body 31, and an O-ring 37 is attached to the circumferential groove 31b. The male screw portion 31a is formed from the front end of the tubular body 31 toward the rear to the circumferential groove 31b. A female screw 27a is formed on the inner peripheral surface of the rear end portion of the former joint main body 27. Therefore, the butt plug 29 can be screwed forward (leftward in FIG. 3) along the axial direction 34 to the rear end portion 25a of the base node 25, and the butt plug 29 is detachably attached to the base node 25. Has been.

The contact plate 50 includes a disk-shaped plate body 51 and a cylindrical insertion portion 52. The insertion portion 52 extends rearward (rightward in FIG. 3) from the central portion of the rear end of the plate body 51. The insertion portion 52 is inserted inside the cylindrical body 31 of the stopper body 30. More specifically, the outer peripheral surface of the insertion portion 52 is in contact with the inner peripheral surface 33 of the tubular body 31, and the rear end surface 51a of the plate body 51 is in contact with the front end 30a of the tubular body 31. The contact plate 50 is fixed to the tubular body 31 using, for example, an adhesive. The contact plate 50 is preferably made of an elastic material.

As shown in FIG. 4, when the buttocks 29 are attached to the base joint 25, the contact plate 50 is located inside the rear end portion 25 a of the base joint 25. Therefore, when the fishing rod 20 is stored (that is, when the first section 21 to the original upper section 24 are stored in the original section 25), after each of the first section 21 to the original upper section 24. The end surface is configured to contact the contact plate 50.

The stopper body 30 and the bridge portion 40 of the buttocks 29 will be described in more detail with reference to FIGS. 4 to 8. FIG. 5 is a rear view of the stopper body 30 and the bridge portion 40 of the buttocks 29. FIG. 6 is a front view of the stopper body 30 and the bridge portion 40 of the buttocks 29. FIG. 7 is a sectional view taken along line VII-VII in FIG. FIG. 8 is a sectional view taken along line VIII-VIII of FIG.

As shown in FIGS. 7 and 8, the bridging portion 40 is rearward (in FIGS. 7 and 8) from the plug body 30 (flange 32) so as to form a predetermined gap 44 with the plug body 30. It swells to the right in the axial direction 34 and spans in the radial direction (first radial direction 35). More specifically, the bridge 40 is bridged between both ends of the flange 32 in the first radial direction 35, and the gap 44 means a space between the bridge 40 and the flange 32. Using the gap 44, a connecting tool such as a hook provided at the tip of the tail rope is attached to the bridge portion 40. Further, in the present embodiment, the bridge portion 40 is smoothly curved, as shown in FIG.

As shown in FIGS. 4 to 8, the bridge portion 40 includes a rear surface 41, a front surface 42, and a pair of side surfaces 43. The rear surface 41 and the front surface 42 are located on the front and back sides of each other in the axial direction 34. The pair of side surfaces 43 are on the front and back sides of each other in the second radial direction 36. As shown in FIGS. 4 and 8, the front surface 42 cooperates with the rear surface 32 a of the flange 32 to define the gap 44 when viewed from the second radial direction 36.

As shown in FIGS. 4 and 8, the rear surface 41 and the front surface 42 are smoothly curved and extended as the bridge portion 40 is bridged while being curved. Therefore, the rear surface 41 and the front surface 42 are both curved surfaces. The shape of the rear surface 41 when viewed from the rear is I-shaped (see FIG. 5 ). The rear surface 41 includes a portion facing the rear of the outer surface of the bridge portion 40 and a portion facing both directions of the first radial direction 35. Similarly, the shape of the front surface 42 when viewed from the front is also I-shaped. The front surface 42 includes a portion of the outer surface of the bridge portion 40 that faces the front and a portion that faces both directions of the first radial direction 35.

As shown in FIGS. 5 and 7, the side surface 43 is a surface extending parallel to the first radial direction 35. As shown in FIG. 7, when viewed from the first radial direction 35, the side surface 43 smoothly curves inward in the second radial direction 36 (leftward in the second radial direction 36 in FIG. 7) and gradually rearward. While extending. The second radial direction 36 is a direction orthogonal to the first radial direction 35 in which the bridge portion 40 extends.

As shown in FIGS. 4 and 7, the side surface 43 is separated from the rear surface 32 a of the flange 32 with the boundary line 45 as a boundary. The side surface 43 is divided into two parts, that is, a curved surface portion 43a and a flat surface portion 43b, with a boundary line 46 as a boundary. The flat surface portion 43b is a flat surface positioned behind the curved surface portion 43a. The two boundary lines 45 and 46 are both lines extending along the direction orthogonal to the axial direction 34 and parallel to the first radial direction 35, and the curvatures of the rear surface 32 a and the side surface 43 of the flange 32. The change position is shown. That is, the rear surface 32a of the flange 32 is a flat surface, and the curved surface portion 43a is a curved surface. The curved surface portion 43a is smoothly connected to the rear surface 32a of the flange 32 via the boundary line 45, and the flat surface portion 43b is smoothly connected to the curved surface portion 43a via the boundary line 46. The boundary lines 45 and 46 may be omitted. That is, the entire side surface 43 may be formed into a smooth curved surface.

[Operation and Effect of Butt Plug according to First Embodiment]

According to the butt plug 29 according to the first embodiment, since the plug body 30 and the bridge portion 40 are integrally formed, the butt plug 29 for a fishing rod can be composed of a single component. Therefore, the bridge portion 40 has improved mechanical strength against external force. Moreover, since the bridge portion 40 has a shape spanning the plug body 30 in the radial direction, the bridge portion 40 can be formed by known simple processing such as forging or cutting, and the thickness of the bridge portion can be designed. And easy to process.

The stopper body 30 of the buttocks 29 is attached to the inside of the former joint 25. When the plug body 30 is attached to the base link 25, the flange 32 contacts the rear end face of the base link 25 and covers at least a part of the rear end face of the base link 25. Therefore, the design of the rear end portion 25a of the original joint 25 is refined.

Since the bridge portion 40 of the buttocks 29 is curved, the mechanical strength of the bridge portion 40, particularly the mechanical strength against an external force in the axial direction 34, is improved.

Since the side surface 43 of the bridge portion 40 of the buttocks 29 extends while curving, the design of the side surface 43 of the bridge portion 40 is refined.

Since the front surface 42 of the bridge portion 40 of the buttocks 29 is a curved surface, stress concentration is avoided and mechanical strength is improved. The design of the bridge section 40 is also refined.

Since the butt plug 29 includes the contact plate 50, when the plurality of joints 21 to 25 constituting the fishing rod 20 are moved rearward in order to put the fishing rod 20 into the stored state, the joints 21 to 25 contact the contact plate 50. Abut 50. Therefore, when the fishing rod 20 in the extended state is stored, the fitting between the nodes is easily released. Therefore, the fishing rod 20 can be easily stored.

[Method for manufacturing butt plug 29]

Next, a method of manufacturing the buttocks 29 will be described with reference to FIGS. 9 and 10. 9 and 10 are views showing a method for manufacturing the buttocks 29. FIG. 9A shows a columnar body as a material, and FIG. 9B shows a post-forming step. FIG. 10A shows a preforming step, and FIGS. 10B and 10C show a punching step and a cutting step, respectively.

As shown in FIG. 9A, a columnar body 60 is prepared as a material for the stopper body 30 and the bridge portion 40 of the buttocks 29. The material of the columnar body 60 is preferably stainless steel or aluminum alloy. The columnar body 60 has a front surface 60a, a rear surface 60b, and a peripheral surface 60c. The columnar body 60 is processed as follows using a lathe, for example. The axial direction of the columnar body 60 coincides with the axial direction 34 of the buttocks 29.

As shown in FIG. 9B, in the post-forming step, the rear surface 60b and the peripheral surface 60c of the columnar body 60 are cut. As a result, the rear end portion 62 of the columnar body 60 is formed in a hemispherical shape. In particular, in the post-forming step, the rear surface 60b and the peripheral surface 60c are formed into a smoothly continuous convex curved surface 62a by cutting the rear end portion 62 of the columnar body 60. The convex curved surface 62a is an outer surface of the rear end portion 62, and swells so as to be convex toward the rear.

As shown in FIG. 10A, in the pre-forming step, the front portion 61 of the columnar body 60 is processed. As a result, a male screw is formed on the outer peripheral surface of the front portion 61. By this processing, the rear end portion 62 that is distinguished from the front portion 61 of the columnar body 60 is formed.

As shown in FIG. 10B, the columnar body 60 is perforated in the perforation step. Specifically, with the axis of the columnar body 60 as the center, holes are bored rearward from the front surface 60a along the axial direction 34. As a result, the recess 63 is formed inside the columnar body 60. In this processing, the columnar body 60 is perforated so that the recess 63 does not penetrate the columnar body 60. That is, the concave portion 63 is formed so that the convex curved surface 62a remains.

As a result, the columnar body 60 is processed into a bottomed tubular shape. The recess 63 extends from the front portion 61 to the inside of the rear end portion 62. By processing the front portion 61 into a tubular shape in this manner, the plug body 30 is formed.

As shown in FIG. 10C, in the cutting step, in the rear end portion 62 of the columnar body 60, two portions 65 (areas defined by the chain double-dashed line in FIG. Corresponding to the described "two symmetrical parts")) is cut. These two portions 65 are symmetrically separated from each other in the second radial direction 36 with respect to the axis of the columnar body 60. Each of the two parts 65 is cut along the first radial direction 35 (direction perpendicular to the paper surface) of the columnar body 60.

By performing the cutting process, as shown in FIG. 10C, the two portions 65 are scraped off from the rear end portion 62, and the central portion 64 of the rear end portion 62 is left. Since the concave portion 63 extends to the inside of the rear end portion 62, the concave portion 63 opening to the front surface 60a penetrates the front portion 61, and as a result, the bridge portion 40 is formed by the central portion 64. Further, as the bridge portion 40 is formed, the flange 32 is formed at the rear end portion of the plug body 30.

Since the concave portion 63 extends to the inside of the rear end portion 62, the inner surface of the concave portion 63 forms the front surface of the bridge portion 40 at the rear end portion 62 and becomes a semispherical curved surface 63b. In the present embodiment, by using an NC lathe, while rotating the cutting tool, the cutting tool is moved along the axis and along a direction orthogonal to the axis, whereby the inner surface of the recess 63 is Has been formed.

As shown in FIG. 10C, in the attaching step, the contact plate 50 is attached to the front end portion of the plug body 30. Through the above steps, the butt plug 29 is formed.

[Operation and effect of manufacturing method of butt plug 29]

The method of manufacturing the butt plug 29 includes the punching step and the cutting step. Through these two steps, the tail stopper 29 in which the stopper body 30 and the bridge portion 40 are integrally formed is easily manufactured. Therefore, according to this manufacturing method, the tail plug 29 formed of a single component can be manufactured at low cost.

In particular, since the method of manufacturing the butt plug 29 includes a post-forming step, the outer surface of the bridge portion 40 has a curved surface. Therefore, the mechanical strength of the bridge portion 40 of the buttocks 29 is improved. However, the subsequent forming step may be omitted.

Further, since the method for manufacturing the butt plug 29 includes a pre-forming step, a male screw is formed on the plug body 30. Therefore, the butt plug 29 that can be screwed into the base joint 25 can be manufactured. However, this pre-forming step may be omitted, and in that case, the butt plug 29 is fitted into the base joint 25.

Furthermore, since the method for manufacturing the butt plug 29 includes an attaching step, the abutment plate 50 is provided on the butt plug 29. Therefore, the butt plug 29 that can easily store the fishing rod 20 can be manufactured. Note that this attaching step may be omitted.

[Other manufacturing method of butt plug 29]

Next, with reference to FIGS. 11 and 12, another method of manufacturing the buttocks 29 will be described. In the other manufacturing methods, the order of the punching step and the cutting step is reversed as compared with the previous manufacturing method. That is, the post-forming step, the pre-forming step, the cutting step, the punching step, and the attaching step are sequentially executed. In other respects, the other manufacturing method is the same as the previous manufacturing method.

11 and 12 are views showing another method for manufacturing the buttocks 29. In particular, FIG. 11A shows a columnar body as a material, and FIG. 11B shows a post-forming step. FIG. 12A shows a preforming step, and FIGS. 12B and 12C show a cutting step and a punching step, respectively.

As shown in FIG. 12B, in the cutting step, in the rear end portion 62 of the columnar body 60, two parts 65 (regions partitioned by the chain double-dashed line in FIG. 12B: The described "corresponding to two symmetrical portions")) are each cut along the first radial direction 35 (direction perpendicular to the paper surface) of the columnar body 60. This leaves the central portion 64 of the rear end 62.

As shown in FIG. 12C, in the drilling step, the columnar body 60 is provided with holes from the front side to the rear side along the axial direction 34 from the front surface 60a around the axis. As a result, the concave portion 63 that opens forward is formed in the columnar body 60. In this punching step, the recess 63 is formed so that the central portion 64 is not penetrated. Here, since the two parts 65 have been cut in the cutting process performed previously, the recess 63 formed in the punching process communicates backward. As a result, the front portion 61 of the columnar body 60 is processed into a tubular shape, and the front portion 61 forms the plug body 30. Further, the central portion 64 forms the bridge portion 40.

[Operation and effect of the other manufacturing method]

This manufacturing method includes a cutting step and a punching step. Through these two steps, the tail stopper 29 in which the stopper body 30 and the bridge portion 40 are integrally formed is easily manufactured. Therefore, the tail plug 29 composed of a single component is manufactured at low cost.

Since the above-described manufacturing method includes the post-forming step, the outer surface of the bridge portion 40 becomes a curved surface, and the mechanical strength of the bridge portion 40 is improved. However, the subsequent forming step may be omitted.

According to the above manufacturing method, the abutment plate 50 is provided on the buttocks 29. Therefore, the fishing rod 20 can be easily stored. However, this pre-forming step may be omitted, and in that case, the butt plug 29 is fitted into the base joint 25.

[Second embodiment of butt plug]

Next, the buttocks 70 according to the second embodiment of the present invention will be described with reference to FIGS. 13 and 14. FIG. 13 is a perspective view of the stopper body 30 and the bridge portion 71 of the buttocks 70. FIG. 14 is a vertical cross-sectional view of the stopper body 30 and the bridge portion 71 of the buttocks 70. The butt plug 70 according to the second embodiment differs from the butt plug 29 according to the first embodiment in the shape of the front surface 72 of the bridge 71. In other respects, the second embodiment is similar to the first embodiment.

As shown in FIGS. 13 and 14, the front surface 72 of the bridge portion 71 has a central surface portion 72a located at the center in the first radial direction 35 and a pair of front surface 72 located on both sides of the central surface portion 72a in the first radial direction 35. And a connection surface portion 72b. Each connecting surface portion 72b extends forward from the central surface portion 72a and is connected to the rear end of the plug body 30. The central surface portion 72a extends straight in the first radial direction 35.

Also in the second embodiment, the butt plug 70 is manufactured using the same manufacturing method as that of the first embodiment. The inner surface of the buttocks 70 according to the second embodiment is also configured by the inner peripheral surface 33 of the stopper body 30 and the front surface 72 of the bridge portion 71, as shown in FIG. 14. The central surface portion 72a and the connection surface portion 72b that form the front surface 72 both draw a straight line. That is, the shape of the front surface 42 (see FIG. 8) of the buttocks 29 according to the first embodiment includes a curved line, whereas the shape of the front surface 72 is composed of only straight lines.

[Operation and effect of butt plug according to second embodiment]

According to the butt plug 70 according to the second embodiment, since the butt plug 30 and the bridge portion 71 are integrally formed, the butt plug 70 can be composed of a single component. Therefore, the bridge portion 71 has improved mechanical strength against external force. Moreover, since the bridging portion 71 has a shape spanning the plug body 30 in the radial direction, the bridging portion 71 can be formed by known simple processing such as forging or cutting, and the thickness of the bridging portion 71 and the like can be determined. Easy to design and process.

The stopper main body 30 of the buttocks 70 is attached to the inside of the base joint 25. Therefore, the design of the rear end portion 25a of the original joint 25 is refined.

Since the bridge portion 71 of the buttocks 70 is curved, the mechanical strength of the bridge portion 71, in particular, the mechanical strength against an external force in the axial direction 34 is improved.

Since the side surface 73 of the bridge portion 71 of the buttocks 70 extends while curving, the design of the side surface 73 of the bridge portion 71 is refined.

Since the central portion of the front surface 72 of the bridge portion 71 of the buttocks 70 is flat (see FIG. 4 ), it is relatively easy to process the front surface 72 and thus the bridge portion 71.

The buttocks 70 include a contact plate 50. Therefore, the fishing rod 20 can be easily stored as in the first embodiment.

Since the front surface 72 is formed in the roof shape as described above, the inner surface of the buttocks 70 can be easily formed by a single drill, for example.

[Third embodiment of butt plug]

Next, the buttocks 80 according to the third embodiment of the present invention will be described with reference to FIGS. 15 and 16. FIG. 15 is a perspective view of the stopper body 30 and the bridge portion 81 of the buttocks 80. FIG. 16 is a partial vertical cross-sectional view of a side surface of the stopper body 30 and the bridge portion 81 of the buttocks 80. The butt plug 80 according to the third embodiment is different from the butt plug 70 according to the second embodiment in the shape of the side surface 83 of the bridge 81. In other respects, the third embodiment is the same as the second embodiment. Therefore, the buttocks 80 according to the third embodiment are the same as the buttocks 29 according to the first embodiment except the shapes of the front surface 72 and the side surfaces 83 of the bridge 81.

As shown in FIG. 15 and FIG. 16, the side surface 83 according to the third embodiment gradually moves from the inward side in the second radial direction 36 (the direction orthogonal to the first radial direction 35) to the rear side in the first radial direction. It extends while being bent at boundaries 45 and 46 parallel to the direction 35. That is, as shown in FIG. 16, the ridgeline of the side surface 83 extends toward the second radial direction 36 with the bridge 81 as the center.

The side surface 83 is separated from the rear surface 32 a of the flange 32 with the boundary line 45 as a boundary. Further, the side surface 83 is divided into two parts, that is, a curved surface portion 83a and a flat surface portion 83b, with the boundary line 46 as a boundary. The curved surface portion 83a is bent with respect to the rear surface 32a of the flange 32 with the boundary line 45 as a boundary. The flat surface portion 83b is bent with respect to the curved surface portion 83a with the boundary line 46 as a boundary.

[Operation and effect of butt plug according to third embodiment]

According to the butt plug 80 according to the third embodiment, the butt plug 80 and the bridge portion 81 are integrally formed, so that the butt plug 80 can be configured by a single component. Therefore, the bridge portion 81 has improved mechanical strength against external force. Moreover, since the bridging portion 81 has a shape spanning the plug body 30 in the radial direction, the bridging portion 81 can be formed by known simple processing such as forging or cutting. Easy to design and process.

The stopper main body 30 of the butt stopper 80 is attached to the inside of the base joint 25. Therefore, the design of the rear end portion 25a of the original joint 25 is refined.

Since the bridge 81 of the buttocks 80 is curved, the mechanical strength of the bridge 81, particularly the mechanical strength against an external force in the axial direction 34, is improved.

Since the side surface 83 of the bridge portion 81 of the buttocks 80 extends while being bent, the mechanical strength of the bridge portion 81 against an external force in a direction intersecting the axial direction 34 is improved. Further, the design of the side surface 83 of the bridge 81 is also refined.

Since the central portion of the front surface 72 of the bridge portion 81 of the buttocks 80 is flat (see FIG. 15), it is relatively easy to process the front surface 72 and thus the bridge portion 71.

The butt plug 80 includes a contact plate 50. Therefore, the fishing rod 20 can be easily stored as in the first embodiment.

Since the front surface 82 is formed in the roof shape as described above, the inner surface of the butt plug 80 can be easily formed by a single drill, for example.
[Variation of butt plug]

In the butt plugs 29, 70, 80 according to the first to third embodiments, the plug body 30 is screwed to the rear end portion 25a of the base joint 25. However, the plug body 30 may be configured so that it can be attached to the rear end portion 25a of the base joint 25. The plug body 30 may be attached to the rear end portion 25a of the base joint 25 by fitting, for example.

In the first to third embodiments, the bridge portions 40, 71, 81 extend while curving. As shown in FIGS. 4, 10, and 15, the bridge portion 40 has a substantially C-shape that is uniformly curved when viewed from the second radial direction 36. However, the bridge portions 40, 71, 81 are not limited to this configuration. The bridge portions 40, 71, 81 may include a portion that extends while curving and a portion that extends while advancing straight. In this case, the shape of the bridge portions 40, 71, 81 may be, for example, a U shape when viewed from the second radial direction 36. Alternatively, the bridge portions 40, 71, 81 may include only a portion extending straight. In this case, the bridge portions 40, 71, 81 are configured to bend at the connection portion between the portions extending while going straight. In this case, the shape of the bridge portions 40, 71, 81 may be, for example, a substantially Π shape or a V shape when viewed from the second radial direction 36.

In the first embodiment, as shown in FIGS. 4 and 7, the side surface 43 of the bridge portion 40 extends while curving smoothly when viewed from the first radial direction 35. In the second embodiment, the side surface 73 of the bridge portion 71 extends while curving smoothly as seen from the first radial direction 35, as shown in FIG. 13. Similarly, in the third embodiment, the side surface 83 of the bridge portion 81 extends while bending as viewed in the first radial direction 35, as shown in FIGS. 15 and 16. The side surfaces of the bridge portions 40, 71, 81 only need to extend gradually from the inward side in the second radial direction 36 to the rear side, and are not limited to the above-described configurations. The side surfaces of the bridge portions 40, 71, 81 may be configured by, for example, one flat surface, or may be configured by a plurality of flat surfaces that are connected so as to bend each other.

20...Fishing rod 25...Mosetsu 29,70,80...Butt plug (Butt plug for fishing rod)
30... Plug body 30a... Front end 30b... Rear end 31... Cylindrical body 31a... Male screw 32... Flange 32a... Rear surface 34... Axial direction 35... 1 radial direction 36... 2nd radial direction 40, 71, 81... Bridge part 41... Rear surface 42, 72, 82... Front surface 43, 73, 83... Side surface 43a, 73a, 83a. ..Curved surface portions 43b, 73b, 83b... Plane portion 44... Gap 45, 46... Boundary line 50... Abutting plate 60... Columnar body 60a... Front surface 60b... Rear surface 60c... Circumferential surface 63... Recessed portion 63a... Side surface 63b... Curved surface 64... Central portion 65... Part (symmetrical part)
72a... central surface portion 72b... connection surface portion

Claims (14)

A butt plug for a fishing rod, which is detachably provided at the rear end of the lunar joint,
A front end and a rear end are open, and a cylindrical plug body attached from the front end side to the rear end of the base node along the axial direction of the base node,
A bridge portion integrally formed at the rear end of the stopper body, bulging rearward from the stopper body so as to form a predetermined gap with the stopper body, and bridged in the radial direction of the stopper body. And a butt plug for a fishing rod. The butt plug for a fishing rod according to claim 1, wherein the plug body includes a tubular body having an outer diameter corresponding to the inner diameter of the base node, and a flange formed at a rear end portion of the tubular body. The butt plug for a fishing rod according to claim 1, wherein the bridge portion is smoothly curved. The butt plug for a fishing rod according to any one of claims 1 to 3, wherein a side surface of the bridge portion gradually and smoothly extends from the inner side in the direction orthogonal to the radial direction to the rear side. The side surface of the bridge portion extends from the inward side in the direction orthogonal to the radial direction to the rear side gradually while being bent at a boundary line extending along a direction orthogonal to the axial direction. The butt plug for a fishing rod according to any one of 1 to 3. The butt plug for a fishing rod according to any one of claims 1 to 5, wherein a front surface of the bridge section that defines the gap extends while curving smoothly. The butt plug for a fishing rod according to claim 1, wherein a central portion of a front surface of the bridge portion that defines the gap extends straight in the radial direction. The butt plug for a fishing rod according to claim 1, wherein the plug body has a cylindrical shape, and an abutting plate is provided at the front end. A method of manufacturing a butt plug for a fishing rod, which is detachably provided at the rear end of the lunar joint,
A front surface, a rear surface, and a columnar body having a peripheral surface, with the axis centered, leaving the rear surface, a perforation step of perforating from the front surface,
In the rear end portion of the columnar body, two symmetrical portions that are radially separated from each other with respect to the axial center are communicated with the recess formed by the boring step along the radial direction of the columnar body. A method for manufacturing a buttocks for a fishing rod, which comprises a cutting step of cutting. The butt for a fishing rod according to claim 9, further comprising a post-forming step of cutting a rear end portion of the columnar body to form a convex curved surface where the rear surface and the peripheral surface are smoothly continuous before the perforating step. Method of manufacturing stopper. The method for manufacturing a tail rod for a fishing rod according to claim 9, further comprising an attaching step of attaching the contact plate to the front end portion of the columnar body after the cutting step. A method of manufacturing a butt plug for a fishing rod, which is detachably provided at the rear end of the lunar joint,
Cutting for cutting two symmetrical portions, which are radially separated from each other in the radial direction with respect to the axial center of the columnar body, of the rear end portion of the columnar body having a front surface, a rear surface, and a peripheral surface, along the radial direction of the columnar body. Process,
The columnar body, around the axis, urchin by forming a recess open to and forward to remaining the rear, and a piercing step of piercing from the front surface, method of manufacturing a fishing rod for butt plug. The fishing rod butt according to claim 12, further comprising a post-forming step of cutting a rear end portion of the columnar body to form a convex curved surface where the rear surface and the peripheral surface are smoothly continuous before the cutting step. Method of manufacturing stopper. The method for manufacturing a tail rod for a fishing rod according to claim 12, further comprising an attaching step of attaching the contact plate to the front end portion of the columnar body after the punching step.

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