JP2017225378A - End plug for fishing rod and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end plug for a fishing rod and its manufacturing method, the end plug that has a simple structure while a back rope can be connected and exhibits sufficient mechanical strength.SOLUTION: An end plug 29 is the end plug for a fishing rod detachably provided at a rear end part of a principal joint 25, and has a front end and a rear end. The end plug 29 includes stopper body 30 and a bridge part 40. The stopper body 30 is attached forward along the axial direction 34 of the principal joint 25 in the rear end of the principal joint 25 from the front end side. The bridge part 40 is formed integrally at the rear end of the stopper body 30. The bridge part 40 swells from the stopper body 30 to the rear part so as to form a predetermined gap 44 between the stopper body 30 and itself. The bridge part 40 is bridged to the first radial direction 35 of the stopper body 30.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a structure of a bottom plug to be attached to a fishing rod and a method for manufacturing the same.

  In general, a fishing rod is composed of a plurality of blanks having different outer diameters, and each blank is referred to as a “section”. The outer diameter of the node constituting the tip is the smallest, the node is referred to as “first node”, and the node adjacent to the first node is referred to as “second node”. Similarly, a node adjacent to the second node is referred to as a third node, and is sequentially referred to as a fourth node, a fifth node, and the like. The outer diameter of each node increases in order from the first node, the node with the largest outer diameter is specifically called the “original node”, and the node adjacent to the original node is specifically called the “original upper node”. There is also. The former section is a section that is held by the angler, and is provided with a grip so that the angler can easily grasp the former section. When a fishing reel is mounted, a reel sheet is provided at the main section. A tail plug is provided at the rear end of the main node (see, for example, Patent Document 1 and Patent Document 2), preventing water from entering each node or entering dust.

  In particular, the total rod is a fishing rod without a reel seat, and the fishing device is directly connected to the tip of the first joint. Therefore, when a target hits in actual fishing, a tensile force and a bending moment act on the total rod at the same time, and a fisherman who operates the total rod has a heavy physical burden, but can be very exciting. On the other hand, in the case of a total rod, when the target hits, the tensile force and the bending moment act directly as described above, so in the actual fishing, the total rod is pulled by the hit target by the carelessness of the fisherman. There is a fear. This is especially true if the target is a large fish. In order to avoid such inconvenience, conventionally, in actual fishing, a tail rope is connected to the above-mentioned stopper, and even if the total rod is pulled, the angler can extend the total length by pulling the tail rope. Can be recovered.

  FIG. 17 is a perspective view of a conventional butt plug. 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 fixed by being screwed into the rear end of the main clause. A connecting pin 4 is erected at the center of the head 3, and a ring 5 is engaged with the connecting pin 4. The tail rope is connected to the ring 5. The hip plug disclosed in Patent Document 2 is a type in which the hip rope is not connected.

JP 2012-130281 A JP 2012-217380 A

  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, there are many processing steps for each part, the assembly process is complicated, and the manufacturing cost is increased. On the other hand, when the butt plug 1 is attached to a total ridge and a large fish is assumed as a target, it is necessary to ensure 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 also a problem that the design is not easy in order to achieve sufficient strength with the structure of the conventional butt plug 1. Note that the bottom plug disclosed in Patent Document 1 has a structure in which a connecting bar is bridged inside the bottom plug, but even in this structure, the number of parts is still large, and sufficient mechanical strength cannot be ensured. There is a problem that it is not easy.

  SUMMARY OF THE INVENTION The present invention has been made based on such a background, and an object of the present invention is to provide a fishing rod buttocks plug having a simple structure and capable of connecting a tail rope and exhibiting sufficient mechanical strength. Is to provide.

  (1) A fishing rod bottom plug according to the present invention is a fishing rod bottom plug that is detachably provided at a rear end portion of a main clause, and has a front end and a rear end, and the rear end of the main clause from the front end side. A plug body that is attached to the end of the plug body in the axial direction along the axial direction and a rear end of the plug body, and the plug body is formed so as to form a predetermined gap between the plug body and the plug body. A bridge portion that bulges rearward from the main body and extends in the radial direction.

  According to this configuration, since the plug main body and the bridge portion are integrally formed, the fishing rod bottom plug can be configured from a single component. For this reason, the mechanical strength with respect to the external force of the bridge portion is improved. Moreover, since the bridge portion has a shape spanned in the radial direction of the plug body, for example, it can be formed by known simple processing such as forging or cutting, and the design and processing of the thickness of the bridge portion, etc. Is easy.

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

  According to this configuration, the plug body is screwed into the inner side of the main clause. When the plug body is attached to the main clause, the flange abuts against the rear end surface of the main clause and covers at least a part of the rear end surface of the main clause. For this reason, the design of the rear end of the original section 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, in particular, the mechanical strength against the 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 perpendicular 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 against external force in the direction intersecting the axial direction in the bridge portion is improved. In addition, the design of the side of the bridge will be refined.

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

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

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

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

  (7) It is preferable that the 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 center part of the front surface of a bridge part is planar, the process of the front surface of a bridge part is comparatively easy.

  (8) Preferably, the plug body has a cylindrical shape and a contact plate is provided at the front end.

  According to this configuration, since the abutment plate is provided, the nodes abut against the abutment plate when the plurality of nodes constituting the fishing rod are moved rearward in order to place the fishing rod in the retracted state. For this reason, when the extended fishing rod is stored, the fitting between the nodes is easily released. Therefore, the fishing rod can be easily stored.

  (9) A method for manufacturing a fishing rod bottom plug according to the present invention is a method for manufacturing a fishing rod bottom plug that is detachably provided at a rear end portion of a main clause, and a columnar body having a front surface, a rear surface, and a peripheral surface. Piercing from the front surface so as to leave the rear surface with the axis as the center, and two symmetrical portions separated from each other in the radial direction with respect to the axis of the rear end portion of the columnar body And a cutting step of cutting along the radial direction of the columnar body.

  According to this configuration, the columnar body is drilled in the axial direction from the front surface to the rear surface by the drilling step. That is, the columnar body is provided with a recess that opens to the front surface, and the columnar body is processed into a bottomed cylindrical shape. Although this recessed part does not penetrate the columnar body, it extends to the rear end of the columnar body. In addition, 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 portion is left. By cutting the two symmetrical portions, the concave portion penetrates the columnar body. The central portion of the columnar body forms a bridge portion that bulges rearward and spans in the radial direction. The front part of the columnar body constitutes the plug body of the bottom plug for a fishing rod and has a cylindrical shape. The plug main body and the bridge portion are integrally formed, and the fishing rod bottom plug is composed of a single component. For this reason, the mechanical strength with respect to the external force of the bridge portion is improved.

  (10) 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 in which the rear surface and the peripheral surface are smoothly continuous before the drilling step.

  According to this structure, the outer surface of a bridge part becomes a curved surface, and the mechanical strength of a bridge part improves.

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

  According to this configuration, the contact plug is provided on the bottom plug. Therefore, when the plurality of nodes constituting the fishing rod are moved rearward in order to place the fishing rod in the retracted state, the nodes abut on the contact plate. For this reason, when the extended fishing rod is stored, the fitting between the nodes is easily released. Therefore, the fishing rod can be easily stored.

  (12) A method for manufacturing a fishing rod bottom plug according to the present invention is a method for manufacturing a fishing rod bottom plug detachably provided at a rear end portion of a main clause, and a columnar body having a front surface, a rear surface, and a peripheral surface. A cutting step of cutting two symmetrical portions separated in the radial direction with respect to the axial center of the columnar body in the rear end portion along the radial direction of the columnar body, and the columnar body with the axial center And a perforating step for perforating from the front surface so as to leave the rear surface.

  According to this configuration, the two symmetrical portions of the rear end portion of the columnar body are cut in the radial direction by the cutting process. As a result, only the central portion of the rear end portion is left. By the drilling step, the columnar body is drilled in the axial direction from the front surface to the rear surface. That is, a recess that opens to the front surface of the columnar body is formed. The recess is formed so as to penetrate the columnar body in the axial direction and leave the rear surface. Thereby, the front part of the columnar body is processed into a cylindrical shape, and the central portion bulges rearward from the front part of the columnar body and constitutes a bridge portion extending in the radial direction. The front part of the columnar body constitutes the plug body of the bottom plug for a fishing rod and has a cylindrical shape. The plug main body and the bridge portion are integrally formed, and the fishing rod bottom plug is composed of a single component. For this reason, the mechanical strength with respect to the external force of the bridge portion is improved.

  (13) It is preferable to include a post-forming step of cutting the rear end portion of the columnar body before the cutting step to form a convex curved surface in which the rear surface and the peripheral surface are smoothly continuous.

  According to this structure, the outer surface of a bridge part becomes a curved surface, and the mechanical strength of a bridge part improves.

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

  According to this configuration, the contact plug is provided on the bottom plug. Therefore, when the plurality of nodes constituting the fishing rod are moved rearward in order to place the fishing rod in the retracted state, the nodes abut on the contact plate. For this reason, when the extended fishing rod is stored, the fitting between the nodes is easily released. Therefore, the fishing rod can be easily stored.

  ADVANTAGE OF THE INVENTION According to this invention, the bottom plug for fishing rods which has a simple structure while a tail 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 bottom plug according to the first embodiment of the present invention. FIG. 2 is a side view of the rear end portion of the main clause provided with the bottom plug according to the first embodiment of the present invention. 3 is a cross-sectional view taken along the line III-III in FIG. FIG. 4 is an exploded perspective view of the bottom plug according to the first embodiment of the present invention. FIG. 5 is a rear view of the plug body and the bridge portion of the bottom plug according to the first embodiment of the present invention. FIG. 6 is a front view of the plug body and the bridge portion of the bottom plug according to the first embodiment of the present invention. 7 is a cross-sectional view taken along the line VII-VII in FIG. 8 is a sectional view taken along line VIII-VIII in FIG. FIG. 9 is a view showing a manufacturing method of the bottom plug 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 process. Show. FIG. 10 is a view showing a manufacturing method of the bottom plug according to the first embodiment of the present invention, in particular, FIG. 10 (a) shows a pre-forming step, FIG. 10 (b) shows a perforating step, 10 (c) shows a cutting process. FIG. 11 is a view showing a manufacturing method of a bottom plug according to the second embodiment of the present invention. In particular, FIG. 11 (a) shows a columnar body as a material, and FIG. 11 (b) shows a post-forming process. Show. FIG. 12 is a view showing a manufacturing method of a bottom plug 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, 12 (c) shows a perforation process. FIG. 13 is a perspective view of the plug body and the bridge portion of the bottom plug according to the second embodiment of the present invention. FIG. 14 is a longitudinal sectional view of a plug body and a bridge portion of a bottom plug according to a second embodiment of the present invention. FIG. 15 is a perspective view of the plug body and the bridge portion of the bottom plug according to the third embodiment of the present invention. FIG. 16 is a partial vertical sectional view of a side surface of a plug body and a bridge portion of a bottom plug according to a third embodiment of the present invention. FIG. 17 is a perspective view of an example of a conventional buttocks having a ring for a buttocks rope.

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

[First embodiment of the bottom plug]

  FIG. 1 is a side view of a fishing rod 20 provided with a bottom plug 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 manner. The blanks 21 to 25 are referred to as “nodes” and are referred to as the first node 21 to the fifth node 25 in order of decreasing outer diameter. The first knot is a knot constituting the tip and has the smallest outer diameter. The fifth clause 25 is specifically referred to as “original clause”, and the fourth clause 24 adjacent to the original clause is particularly referred to as “original upper clause”. In the present embodiment, the fishing rod 20 is a so-called total rod and is used for, for example, a mountain stream.

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

  The first joint 21 is formed in a tapered shape as a whole, and is formed so that the outer diameter of the rear end portion is larger than the outer diameter of the front end portion. In addition, the rear end diameter of the first joint 21 is set larger than the tip diameter of the second joint 22. Therefore, when the first joint 21 is pulled out from the second joint 22, the rear end portion of the first joint 21 is engaged with the tip portion of the second joint 22 by a predetermined dimension ( It is fitted inside), and both are fixed by this. The relationship between the second clause 22 and the third clause 23, the relationship between the third clause 23 and the original upper clause 24, and the relationship between the former upper clause 24 and the original clause 25 are also the first clause 21. And the relationship between the second clause 22 and the second clause 22.

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

  The bottom plug 29 is attached to the base clause 25 so that the axis of the bottom plug 29 coincides with the axis of the base clause 25. The directions of both axial centers coincide with the axial direction of the original joint 25 and the axial direction of the bottom plug 29. In this axial direction, reference numeral 34 is given. Further, the radial direction of the base joint 25 and the radial direction of the butt plug 29 also coincide, and in particular, the posture of the butt plug 29 is defined by using two radial directions orthogonal to each other in the radial direction. 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 bottom plug 29. As shown in FIGS. 3 and 4, the bottom 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 formed integrally with the rear end 30 b of the plug body 30. The contact plate 50 is provided at the front end 30 a of the plug body 30. Although mentioned later in detail, the 1st radial direction 35 is a direction where the bridge part 40 is extended. In FIG. 4, the contact plate 50 is separated from the plug body 30 and the bridge portion 40.

  The plug body 30 includes a cylindrical body 31 and a flange 32. Therefore, the plug body 30 has an inner peripheral surface 33. The outer diameter of the cylindrical body 31 corresponds to the inner diameter of the main node 25 (the inner diameter of the main node body 27). The flange 32 is formed at the rear end of the cylindrical body 31. As shown in FIG. 3, the cylindrical body 31 can be inserted into the base clause 25. The flange 32 covers the rear end surface of the main knot 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 main clause body 27.

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

  The contact plate 50 includes a disk-shaped plate body 51 and a columnar 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 into the cylindrical body 31 of the plug body 30. More specifically, the outer peripheral surface of the insertion portion 52 is in contact with the inner peripheral surface 33 of the cylindrical body 31, and the rear end surface 51 a of the plate body 51 is in contact with the front end 30 a of the cylindrical body 31. The contact plate 50 is fixed to the cylindrical body 31 using, for example, an adhesive. The contact plate 50 is preferably made of an elastic material.

  As shown in FIG. 4, the contact plate 50 is positioned inside the rear end portion 25 a of the main joint 25 in a state where the bottom plug 29 is attached to the main joint 25. Therefore, when the fishing rod 20 is stored (that is, when the first joint 21 to the former upper section 24 are accommodated in the former section 25), the rear of the first joint 21 to the former upper section 24, respectively. The end face comes into contact with the contact plate 50.

  With reference to FIGS. 4-8, the plug main body 30 and the bridge part 40 of the butt plug 29 are demonstrated in detail. FIG. 5 is a rear view of the plug body 30 and the bridge portion 40 of the bottom plug 29. FIG. 6 is a front view of the plug body 30 and the bridge portion 40 of the bottom plug 29. 7 is a cross-sectional view taken along the line VII-VII in FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

  As shown in FIGS. 7 and 8, the bridge 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 in the axial direction 34 (to the right in the axial direction 34) and spans in the radial direction (first radial direction 35). More specifically, the bridge portion 40 is bridged between both end portions of the flange 32 in the first radial direction 35, and the gap 44 means a space between the bridge portion 40 and the flange 32. A coupling tool such as a hook provided at the tip of the tail rope is attached to the bridge 40 using the gap 44. 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 in front and back positions in the axial direction 34. The pair of side surfaces 43 are located on the front and back sides in the second radial direction 36. As shown in FIGS. 4 and 8, when viewed from the second radial direction 36, the front surface 42 defines a gap 44 in cooperation with the rear surface 32 a of the flange 32.

  As shown in FIGS. 4 and 8, the rear surface 41 and the front surface 42 extend while being smoothly curved as the bridge portion 40 is bridged while being curved. Therefore, both the rear surface 41 and the front surface 42 are 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 rearward and a portion facing both sides of the first radial direction 35 in the outer surface of the bridge portion 40. Similarly, the shape of the front surface 42 when viewed from the front is also I-shaped. The front surface 42 includes a portion facing forward and a portion facing both sides of the first radial direction 35 in the outer surface of the bridge portion 40.

  As shown in FIGS. 5 and 7, the side surface 43 is a surface extending in parallel with the first radial direction 35. As shown in FIG. 7, when viewed from the first radial direction 35, the side surface 43 smoothly curves from the inward direction of the second radial direction 36 (leftward of the second radial direction 36 in FIG. 7) gradually to the rear. 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 a 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 the boundary line 46 as a boundary. The plane part 43b is a plane located behind the curved surface part 43a. The two boundary lines 45 and 46 are lines extending along a 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 are the same. 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. Further, the curved surface portion 43 a is smoothly connected to the rear surface 32 a of the flange 32 through the boundary line 45, and the flat surface portion 43 b is smoothly connected to the curved surface portion 43 a through the boundary line 46. The boundary lines 45 and 46 may not be provided. That is, the entire side surface 43 may be formed into a smooth curved surface.

[Operation and Effect of Buttocks 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 fishing butt plug 29 can be composed of a single component. For this reason, the bridge part 40 improves the mechanical strength with respect to an external force. Moreover, since the bridge portion 40 has a shape extending in the radial direction of the plug main body 30, it can be formed by known simple processing such as forging or cutting, and the thickness of the bridge portion can be designed. And processing is easy.

  The plug body 30 of the bottom plug 29 is attached to the inner side of the original section 25. When the plug main body 30 is attached to the main node 25, the flange 32 abuts on the rear end surface of the main node 25 and covers at least a part of the rear end surface of the main node 25. For this reason, the design of the rear end portion 25a of the original clause 25 is refined.

  Since the bridge portion 40 of the bottom plug 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 bottom plug 29 extends while being curved, 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 bottom plug 29 is a curved surface, stress concentration is avoided and the mechanical strength is improved. In addition, the design of the bridge 40 will be refined.

  Since the bottom plug 29 includes the contact plate 50, when the plurality of nodes 21 to 25 constituting the fishing rod 20 are moved rearward in order to place the fishing rod 20 in the retracted state, the nodes 21 to 25 become the contact plates. 50 abuts. For this reason, 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 stored easily.

[Manufacturing method of bottom plug 29]

  Next, with reference to FIG. 9 and FIG. 9 and 10 are diagrams showing a method for manufacturing the bottom plug 29. FIG. 9A shows a columnar body as a material, and FIG. 9B shows a post-forming process. 10A shows a pre-forming process, and FIGS. 10B and 10C show a drilling process and a cutting process, respectively.

  As shown in FIG. 9A, a columnar body 60 is prepared as a material for the plug body 30 and the bridge portion 40 of the bottom plug 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, for example, a lathe. The axial direction of the columnar body 60 coincides with the axial direction 34 of the bottom plug 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. Thereby, 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 end portion 62 of the columnar body 60 is cut, whereby the rear surface 60b and the peripheral surface 60c are formed into a smoothly continuous convex curved surface 62a. The convex curved surface 62a is an outer surface of the rear end portion 62, and bulges so as to be convex toward the rear.

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

  As shown in FIG. 10 (b), in the drilling step, holes are made in the columnar body 60. Specifically, the hole is drilled rearward along the axial direction 34 from the front surface 60 a around the axis of the columnar body 60. Thereby, the recessed part 63 is formed inside the columnar body 60. In this processing, the columnar body 60 is perforated so that the concave portion 63 does not penetrate the columnar body 60. That is, the concave portion 63 is formed so that the convex curved surface 62a remains.

  Thereby, the columnar body 60 is processed into a bottomed cylindrical shape. The concave portion 63 extends from the front portion 61 to the inside of the rear end portion 62. Thus, the said plug part 30 is formed by processing the said front part 61 in a cylinder shape.

  As shown in FIG. 10C, in the cutting process, in the rear end portion 62 of the columnar body 60, two portions 65 (regions defined by two-dot chain lines in FIG. 10B: claims) Corresponding to the “two symmetrical parts” described)) is cut. These two portions 65 are symmetrically separated in the second radial direction 36 with respect to the axis of the columnar body 60. The two portions 65 are each cut along the first radial direction 35 (direction perpendicular to the paper surface) of the columnar body 60.

  By executing 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 remains. Since the concave portion 63 extends to the inside of the rear end portion 62, the concave portion 63 opened to the front surface 60 a 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 a front surface of the bridge portion 40 at the rear end portion 62 and becomes a hemispherical curved surface 63 b. In the present embodiment, by using an NC lathe to rotate the cutting tool, the cutting tool is moved along the axis and is moved along a direction perpendicular to the axis, whereby the inner surface of the recess 63 is Is formed.

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

[Operation and Effect of Manufacturing Method of Bottom Plug 29]

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

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

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

  Furthermore, since the manufacturing method of the bottom plug 29 includes an attaching step, the bottom plate 29 is provided with a contact plate 50. Therefore, the bottom plug 29 capable of easily storing the fishing rod 20 can be manufactured. This attachment step may be omitted.

[Other manufacturing methods for bottom plug 29]

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

  11 and 12 are diagrams showing another manufacturing method of the bottom plug 29. FIG. In particular, FIG. 11A shows a columnar body as a material, and FIG. 11B shows a post-forming process. 12A shows the pre-forming process, and FIGS. 12B and 12C show the cutting process and the drilling process, respectively.

  As shown in FIG. 12 (b), in the cutting process, in the rear end portion 62 of the columnar body 60, two portions 65 (regions defined by the two-dot chain line in FIG. 12 (b): claims. (Corresponding to “two symmetrical portions”) described above) is cut along the first radial direction 35 (direction perpendicular to the paper surface) of the columnar body 60. As a result, the central portion 64 of the rear end portion 62 remains.

  As shown in FIG. 12C, in the drilling step, the columnar body 60 is provided with holes from the front surface 60a along the axial direction 34 from the front to the rear, with the axial center as the center. Thereby, the recessed part 63 opened ahead is formed in the columnar body 60. In this drilling step, a recess 63 is formed so that the central portion 64 is not penetrated. Here, since the two parts 65 are cut in the cutting process executed previously, the recess 63 formed in the drilling process communicates rearward. Thereby, the front part 61 of the columnar body 60 is processed into a cylindrical shape, and the plug body 30 is formed by the front part 61. Further, the central portion 64 forms the bridge portion 40.

[Actions and effects of other manufacturing methods]

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

  Since the said manufacturing method is equipped with a post-forming process, the outer surface of the bridge part 40 becomes a curved surface, and the mechanical strength of the bridge part 40 improves. However, the subsequent forming step may be omitted.

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

[Second embodiment of the bottom plug]

  Next, with reference to FIGS. 13 and 14, a tail plug 70 according to a second embodiment of the present invention will be described. FIG. 13 is a perspective view of the plug body 30 and the bridge portion 71 of the bottom plug 70. FIG. 14 is a longitudinal sectional view of the plug body 30 and the bridge portion 71 of the bottom plug 70. The bottom plug 70 according to the second embodiment is different from the bottom plug 29 according to the first embodiment in the shape of the front surface 72 of the bridge portion 71. In other respects, the second embodiment is the same as the first embodiment.

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

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

[Operation and Effect of Butt Plug According to Second Embodiment]

  According to the butt plug 70 according to the second embodiment, since the plug body 30 and the bridge portion 71 are integrally formed, the butt plug 70 can be configured from a single component. For this reason, the mechanical strength with respect to the external force of the bridge portion 71 is improved. Moreover, since the bridge portion 71 has a shape that spans the plug body 30 in the radial direction, it can be formed by a known simple process such as forging or cutting, and the thickness of the bridge portion 71 can be determined. Easy to design and process.

  The plug body 30 of the bottom plug 70 is attached to the inner side of the original section 25. For this reason, the design of the rear end portion 25a of the original clause 25 is refined.

  Since the bridge portion 71 of the bottom plug 70 is curved, the mechanical strength of the bridge portion 71, particularly, 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 bottom plug 70 extends while being curved, 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 bottom plug 70 is planar (see FIG. 4), the processing of the front surface 72 and thus the processing of the bridge portion 71 is relatively easy.

  The bottom plug 70 includes 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 a roof shape as described above, the inner surface of the bottom plug 70 can be easily formed by a single drill, for example.

[Third embodiment of the bottom plug]

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

  As shown in FIGS. 15 and 16, the side surface 83 according to the third embodiment has a first diameter gradually from the inward direction in the second radial direction 36 (the direction perpendicular to the first radial direction 35) to the rear. The film extends while being bent at boundary lines 45 and 46 parallel to the direction 35. That is, as shown in FIG. 16, the ridgeline of the side surface 83 extends from the bridge portion 81 to the second radial direction 36 so as to spread toward the end.

  The side surface 83 is separated from the rear surface 32a of the flange 32 with the boundary line 45 as a boundary. 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 plane 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, since the plug body 30 and the bridge portion 81 are integrally formed, the butt plug 80 can be configured from a single component. For this reason, the mechanical strength with respect to the external force of the bridge portion 81 is improved. Moreover, since the bridge portion 81 has a shape spanned in the radial direction of the plug main body 30, it can be formed by known simple processing such as forging or cutting, and the thickness of the bridge portion 81, etc. Easy to design and process.

  The plug body 30 of the bottom plug 80 is attached to the inner side of the original section 25. For this reason, the design of the rear end portion 25a of the original clause 25 is refined.

  Since the bridge portion 81 of the bottom plug 80 is curved, the mechanical strength of the bridge portion 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 bottom plug 80 extends while being bent, the mechanical strength against external force in the direction intersecting the axial direction 34 in the bridge portion 81 is improved. In addition, the design of the side surface 83 of the bridge portion 81 is refined.

  Since the central portion of the front surface 72 of the bridge portion 81 of the bottom plug 80 is planar (see FIG. 15), the processing of the front surface 72 and, in turn, the processing of the bridge portion 71 is relatively easy.

  The bottom 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 a roof shape as described above, the inner surface of the bottom plug 80 can be easily formed by a single drill, for example.
[Modification of butt plug]

  In the bottom plugs 29, 70, and 80 according to the first to third embodiments, the plug main body 30 is screwed into the rear end portion 25 a of the main joint 25. But the plug main body 30 should just be comprised so that attachment to the rear-end part 25a of the original clause 25 is possible. The plug body 30 may be attached to the rear end portion 25a of the main clause 25 by fitting, for example.

  In the first to third embodiments, the bridge portions 40, 71, 81 extend while being curved. 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 being curved and a portion that extends while going straight. In this case, the shape of the bridge portions 40, 71, 81 may be, for example, U-shaped when viewed from the second radial direction 36. Alternatively, the bridge portions 40, 71, 81 may include only a portion that extends while going straight. In this case, the bridge portions 40, 71, 81 are configured to bend at the connecting 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 square 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 being smoothly curved when viewed from the first radial direction 35. In the second embodiment, as shown in FIG. 13, the side surface 73 of the bridge portion 71 extends while being smoothly curved as viewed from the first radial direction 35. Similarly, in the third embodiment, the side surface 83 of the bridge portion 81 extends while being bent as seen from the first radial direction 35 as shown in FIGS. 15 and 16. The side surfaces of the bridge portions 40, 71, 81 need only extend gradually from the inward direction of the second radial direction 36, and are not limited to the above-described configuration. The side surfaces of the bridge portions 40, 71, 81 may be constituted by, for example, one plane, or may be constituted by a plurality of planes connected so as to be bent with respect to each other.

20 ... fishing rod 25 ... original clause 29, 70, 80 ... butt plug (fish butt plug)
30 ... Plug body 30a ... Front end 30b ... Rear end 31 ... Tube 31a ... Male screw 32 ... Flange 32a ... Rear surface 34 ... Axial direction 35 ... First 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 parts 43b, 73b, 83b... Flat part 44 ... Clearance 45, 46 ... Boundary line 50 ... Abutment plate 60 ... Columnar body 60a ... Front face 60b ... Rear face 60c ... peripheral surface 63 ... concave part 63a ... side 63b ... curved surface 64 ... central part 65 ... part (symmetric part)
72a: Central surface portion 72b: Connection surface portion

Claims (14)

A butt plug for a fishing rod that is detachably provided at the rear end of the former section,
A plug main body having a front end and a rear end and attached to the rear end portion of the main clause from the front end side along the axial direction of the main clause;
A bridge portion integrally formed at the rear end of the plug body, bulging backward from the plug body so as to form a predetermined gap with the plug body, and spanning in the radial direction of the plug body A fishing rod butt plug comprising:   2. The fishing rod butt plug according to claim 1, wherein the plug body includes a cylindrical body having an outer diameter corresponding to an inner diameter of the base section and a flange formed at a rear end portion of the cylindrical body.   The fishing rod bottom plug according to claim 1 or 2, wherein the bridge portion is smoothly curved.   4. The rod plug for a fishing rod according to claim 1, wherein a side surface of the bridge portion extends while smoothly curving gradually from the inward direction in a direction orthogonal to the radial direction to the rear. 5.   The side surface of the bridge portion extends from the inward direction in the direction orthogonal to the radial direction gradually to the rear while being bent with a boundary line extending along the direction orthogonal to the axial direction as a boundary. 4. A fishing rod bottom plug according to any one of items 1 to 3.   The fishing rod bottom plug according to any one of claims 1 to 5, wherein a front surface of the bridge section defining the gap extends while being smoothly curved.   The fishing rod bottom plug according to any one of claims 1 to 5, wherein a central portion of the front surface of the bridge section that defines the gap extends straight in the radial direction.   The fishing rod bottom plug according to any one of claims 1 to 7, wherein the plug body has a cylindrical shape, and a contact plate is provided at the front end. A method for manufacturing a fishing rod butt plug that is detachably provided at the rear end of the main section,
A drilling step of drilling a pillar-shaped body having a front surface, a rear surface, and a peripheral surface from the front surface so as to leave the rear surface around the axis;
A fishing rod bottom plug comprising: a cutting step of cutting two symmetrical portions radially separated from the axial center of the rear end portion of the columnar body along the radial direction of the columnar body. Method.   The fishing rod butt according to claim 9, further comprising a post-forming step of cutting a rear end portion of the columnar body before the drilling step to form a convex curved surface in which the rear surface and the peripheral surface are smoothly continuous. Manufacturing method of the stopper.   The manufacturing method of the bottom plug for fishing rods of Claim 9 or 10 provided with the attachment process which attaches a contact plate to the front-end part of the said columnar body after the said cutting process. A method for manufacturing a fishing rod butt plug that is detachably provided at the rear end of the main section,
Cutting that cuts two symmetrical portions radially separated from 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 circumferential surface along the radial direction of the columnar body Process,
A method for manufacturing a bottom plug for a fishing rod, comprising: a step of perforating the columnar body from the front surface so as to leave the rear surface with the axis as a center.   The fishing rod butt according to claim 12, further comprising a post-forming step of cutting a rear end portion of the columnar body before the cutting step to form a convex curved surface in which the rear surface and the peripheral surface are smoothly continuous. Manufacturing method of the stopper.   The manufacturing method of the bottom plug for fishing rods of Claim 12 or 13 provided with the attachment process which attaches a contact plate to the front-end part of the said columnar body after the said perforation process.

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