JP2015173597A - fishing rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fishing rod that can reduce stress concentration of a fitting part without weight increase of each rod joint and can prevent damage to the rod joint.SOLUTION: In a fishing rod 10 of this invention, a first rod joint 12, a butt front rod joint 13, and a butt rod joint 14 are connected in a longitudinal direction. An end portion of the first rod joint 12 is fit to an end portion of the butt front rod joint 13 along an axial direction 7. An end portion of the butt front rod joint 13 is fit to an end portion of the butt rod joint 14 along the axial direction 7. A tip portion of the butt rod joint 14 is cut off to have an end surface 62 tilted at 45° (30°-55°) with respect to the axial direction 7. The end surface 62 of the butt rod joint 14 is disposed to open at a side where tensile stress of the butt front rod joint 13 is generated when a bending moment M acts on each hollow rod joint 16.

Description

  The present invention relates to a fishing rod constructed by joining a plurality of nodes in the longitudinal direction, and specifically to a structure of a joint portion of adjacent nodes.

  Generally, a fishing rod is constituted by joining a plurality of nodes (blanks) in the longitudinal direction. As a method of joining each node, there are a swing-out type and a side-by-side type.

  When the fish hits and a bending moment acts on the fishing rod, stress concentration occurs at the joint portion (fitting portion) between the nodes, and as a result, when the generated stress reaches a certain level, the fishing rod is damaged. In order to alleviate the stress concentration in the fitting portion, a fishing rod having a node end cut obliquely is provided (see, for example, Patent Document 1).

JP 2001-258431 A

  In the fishing rod disclosed in Patent Document 1, since the end face of the node is inclined without being orthogonal to the longitudinal direction of the node, the stress concentration of the fitting portion is certainly alleviated. However, even if the stress concentration is relaxed, if the magnitude of the stress generated in the fitting portion exceeds a certain value, the node is still damaged. In other words, even if the end face of the node is cut obliquely, the stress generated in the fitting portion increases as the length of the fitting portion (the overlap between adjacent nodes) becomes shorter. The dangers of this are not wiped out. On the other hand, if the fitting portion is lengthened, the generated stress is suppressed, but the weight of the node increases and the fishing rod becomes heavy. If an increase in weight is allowed in the design of the node, the end surface of the node is straightened as in the past, without the advanced processing of cutting the end of the node diagonally (see reference 1). It should be cut (perpendicular to the longitudinal direction of the node), and the thickness of the fitting portion should be increased within an allowable range.

  The present invention has been made based on such a background, and its object is to reduce the stress concentration at the fitting portion without increasing the weight of each node as compared with the conventional fishing rod, and to break the node. It is to provide a fishing rod that can prevent.

  (1) A fishing rod according to the present invention is a fishing rod having a plurality of hollow nodes, and an end of a small-diameter hollow node is fitted to an end of a large-diameter hollow node along the longitudinal direction. The end of the large-diameter hollow node is cut obliquely so that the end surface of the hollow node is inclined at 30 ° to 55 ° with respect to the longitudinal direction. The end face of the large-diameter hollow node is arranged so as to open to the side where the tensile stress of the small-diameter hollow node occurs when a bending moment acts on each hollow node.

  In this fishing rod, each hollow node (blank) is joined along the longitudinal direction. Various types can be adopted as the splicing type, in addition to the parallel splicing and swing-out types. As shown in FIG. 6, the small-diameter hollow node is fitted inside the large-diameter hollow node. FIG. 2A shows a fitting portion of adjacent hollow nodes in a conventional fishing rod. In the present invention, since the end face of the large-diameter hollow node is cut obliquely, the fitting portion has the structure shown in FIG.

  As shown in FIG. 4A, in the conventional fishing rod, the end surface 2 of the large-diameter hollow node 1 is orthogonal to the axial direction 7, but in the present invention, the end surface of the large-diameter hollow node 1 2 is inclined with respect to the axial direction 7, and the inclination angle θ is 30 ° (degree) to 55 °. As described above, since the end surface 2 of the large-diameter hollow node 1 is inclined, when a bending moment is applied to each hollow node, stress concentration generated in each hollow node is reduced. In addition, the overlap L between the large-diameter hollow node and the small-diameter hollow node 3 is the same. The overlap L in the present invention refers to the distance from the center C of the end surface 2 of the large-diameter hollow node 1 to the end surface 4 of the small-diameter hollow node 3 as shown in FIG. By defining the overlap L in this way, even if the end face 2 of the large-diameter hollow node 1 is cut obliquely, the weight of the fitting portion is unchanged.

  In the present invention, as shown in FIG. 5C, the opening 5 appearing on the end face 2 of the large-diameter hollow node 1 has the tensile stress of the small-diameter hollow node 3 when a bending moment M acts on the adjacent hollow node. Facing the side where That is, as shown in FIG. 6C, when the bending moment M (see FIG. 5B) is applied so that the fishing rod protrudes upward, the opening 5 is arranged to face upward. That is, in a state where the bending moment M is applied, the large-diameter hollow node 1 supports the portion where the compressive stress is generated in the small-diameter hollow node 3 on a wider surface than the other portions. The breakage of the fitting portion that occurs when the bending moment M acts is due to the buckling of the portion where the compressive stress is generated in the small-diameter hollow node 3, and thus the portion where the compressive stress is generated in the small-diameter hollow node 3 Is supported on a wide surface, the value of the generated compressive stress is reduced.

  Here, the smaller the inclination angle θ described above, the less the stress concentration generated in each hollow node, and the portion of the small diameter hollow node 3 where compressive stress is generated is supported on a wider surface. However, when the inclination angle θ is smaller than 30 °, the end surface of the large-diameter hollow node 4 becomes sharp, and the fitting portion tends to be damaged instead.

  (2) It is preferable that the direction of the normal line of the end face of the large-diameter hollow node is along a longitudinal section passing through the center of the small-diameter hollow node.

  (3) The large-diameter hollow node and the small-diameter hollow node are arranged on the butt side and tip side of the fishing rod, and the butt-side end portion of the small-diameter hollow node is the above-mentioned large-diameter hollow node. It is preferably inserted and fitted inside the tip side end.

  According to this invention, the end of the large-diameter hollow node is cut obliquely, and the opening formed in the end is directed to the side where the tensile stress occurs. Thereby, it is avoided that stress concentrates on the fitting part comprised by adjacent hollow nodes, and the value of the compressive stress causing the breakage of the fishing rod is also reduced. And since the overlap of the said fitting part is unchanged compared with the conventional fishing rod, the stress concentration and damage of the said fitting part are prevented, without increasing the weight of a fishing rod.

FIG. 1 is a front view of a main part of a fishing rod 10. FIG. 2 is an exploded perspective view of the fitting portions of the original upper section 13 and the original section 14. FIG. 3 is a front view of the fitting portion of the original upper section 13 and the original section 14. FIG. 4 is a front view and a cross-sectional view of the fitting portions of the original upper section 13 and the original section 14. FIG. 5 is a plan view and a cross-sectional view of the fitting portions of the original upper section 13 and the original section 14. FIG. 6 is a diagram showing the effects of the present invention. (A) is a front view of a fitting portion of adjacent hollow nodes in a conventional fishing rod, (B) is a front view of a fitting portion of adjacent hollow nodes in a fishing rod according to the present invention, and (C) is a book It is a perspective view of the fitting part of the adjacent hollow node in the fishing rod which concerns on invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings as appropriate. In addition, this Embodiment is only one aspect of the fishing rod which concerns on this invention, and it cannot be overemphasized that an embodiment may be changed in the range which does not change the summary of this invention.

[Overall configuration of fishing rod 10]

  FIG. 1 is a front view of an essential part of a fishing rod 10 according to an embodiment of the present invention. (A) The figure has shown the state in which the bending moment M is not acting on the fishing rod 10, (B) The figure has shown the state in which the bending moment M acted.

  The fishing rod 10 is a swing-out type. A fishing reel 11 is mounted on a fishing rod 10 shown in FIG. Note that the fishing rod 10 shown in FIG. 1A is in a state where no fish has been hit. On the other hand, the fishing rod 10 shown in FIG. 1B is in a state where the fish has been hit, and the fishing rod 10 is bent by the bending moment M acting on the fishing rod 10.

  The fishing rod 10 is made of carbon fiber reinforced plastic or glass fiber reinforced plastic. In this embodiment, the fishing rod 10 includes three hollow nodes 16 and a plurality of guide members 15. Each hollow node 16 is an elongated rod-like member (sometimes referred to as “blank”) constituting the fishing rod 10. These hollow nodes 16 are called the first node 12 and the second node 13 in order from the front end side of the fishing rod 10, and the node at the rearmost end (base end) is particularly called the original node 14. The previous section continuing to the original section 14 is particularly called the original upper section. Since the fishing rod 10 shown in FIG. 1 includes three hollow nodes 16, the second node 13 is the original upper node 13.

  Each hollow node 16 is formed in a cylindrical shape. Each hollow node 16 can be manufactured by a known method, for example, by winding a resin sheet (carbon prepreg) impregnated with carbon fiber in a spiral shape and firing it. The hollow nodes 16 are fitted to each other, and this fitting will be described in detail later.

  A guide member 15 is provided in each hollow node 16. Each guide member 15 has an insertion hole through which a fishing line 19 fed from the fishing reel 11 is inserted. Each guide member 15 guides the fishing line 19 along the outer peripheral surface of the fishing rod 10 in the axial direction 7 of the fishing rod 10 (corresponding to the longitudinal direction which is the left-right direction of the paper surface in FIG. 1A). Is. That is, the fishing rod 10 shown in FIG. 1 is a so-called outer guide type fishing rod.

  The fishing rod 10 has a tip portion 41 and a butt portion 44. The tip portion 41 is a tip portion (a tip portion and a portion in the vicinity thereof) of the fishing rod 10. The first node 12 constitutes a part of the tip portion 41. The butt portion 44 is a proximal end portion (a proximal end portion and a portion in the vicinity thereof) of the fishing rod 10. The original clause 14 constitutes a part of the butt portion 44. The butt portion 44 is provided between a rear grip 45 provided in the vicinity of the proximal end of the base clause 14, a front grip 46 provided on the front end side of the rear grip 45, and the rear grip 45 and the front grip 46. And a reel sheet 47.

  The rear grip 45 and the front grip 46 are formed of a member having a high friction coefficient such as rubber. When the fishing rod 10 is used, at least one of the rear grip 45 and the front grip 46 is gripped by the user of the fishing rod 10. The reel sheet 47 is for holding the fishing reel 11 on the fishing rod 10. The reel seat 47 includes a fixed hood 48, a movable hood 49 that can be moved toward and away from the fixed hood 48, and a lock portion (not shown) that locks the slide of the movable hood 49. The movable hood 49 cooperates with the fixed hood 48 to sandwich the legs of the fishing reel 11, whereby the fishing reel 11 is positioned and fixed to the reel seat 47.

[Fitting of hollow nodes 12, 13, 14]

  As described above, the fishing rod 10 includes the three hollow nodes 16 (the first node 12, the original upper node 13, and the original node 14). The hollow nodes 16 are fitted to each other along the axial direction 7 of the fishing rod 10. That is, the rear end portion of the first joint 12 is fitted to the distal end portion of the original upper clause 13, and the rear end portion of the former upper clause 13 is fitted to the distal end portion of the original clause 14.

  As shown in FIG. 2, the base section 14 is formed in a cylindrical shape, so that an opening 68 is formed in the end face 62 on the tip side (the tip portion 41 side) of the base section 14. The rear end side (the butt portion 44 side) portion of the original upper clause 13 is fitted into the original clause 14 through the opening 68. The original upper section 13 is formed in a tapered shape as a whole, and the outer diameter on the rear end side is larger than the outer diameter on the front end side. Further, the outer diameter of the rear end of the original upper section 13 is set larger than the inner diameter of the front end side of the original section 14. Thereby, when the original upper clause 13 is pulled out from the original clause 14, the rear end portion of the original upper clause 13 is fitted with the tip portion of the original clause 14, and both are fixed. The relationship between the first clause 12 and the original upper clause 13 is the same.

  As shown in FIG. 3A, in the present embodiment, the distal end portion of the original joint 14 is cut obliquely. The end face 62 of the original upper section 14 is inclined by an angle θ with respect to the axial direction 7, and in the present embodiment, the angle θ is 45 ° (degree). Although not shown, the tip of the original upper section 13 is also obliquely cut so as to be inclined by an angle θ with respect to the axial direction 7. Further, as shown in FIGS. 5B and 5C, the angle θ can be appropriately set in the range of 30 ° to 55 °.

  Here, as the angle θ is smaller, the stress concentration generated in each hollow node 16 is relaxed, and the portion of the original upper node 13 where the compressive stress is generated is supported on a wider surface. However, when the inclination angle θ is smaller than 30 °, the end face of the original clause 14 becomes sharp, and the fitting portion between the original upper clause 13 and the original clause 14 tends to be damaged.

  When the bending moment M acts, the end face 62 of the original node 14 is open to the side where the tensile stress is generated on the surface of the original upper node 13. When the bending moment M in the direction shown in FIG. 1 (B) acts on the fishing rod 10, the fishing rod 10 is curved so as to protrude upward as shown in FIG. 1 (B). At this time, tensile stress is generated outside the curved fishing rod 10 and compressive stress is generated inside the curved fishing rod 10. That is, in FIG. 3A, a tensile stress is generated in the upper part of the neutral plane including the central axis S.

  The end face 62 of the original clause 14 will be described in detail.

  4A and 4B show a state in which the opening 68 of the end face 62 is straight upward. An uppermost edge point P1 and a lowermost edge point P2 are defined on the end face 62. In this case, the uppermost edge point P <b> 1 is located outside the curved fishing rod 10 and the lowermost edge point P <b> 2 is located inside the curved fishing rod 10. Since the end face 62 is inclined, the overlap between the original node 14 and the original upper node 13 at the uppermost edge P1 is indicated by a distance L1, and the original node 14 and the original upper node 13 at the lowest edge point P2 are overlapped. The overlap is indicated by the distance L2. The uppermost edge point P1 is a position where the overlap is minimized, and the lowermost edge point P2 is a position where the overlap is maximized.

  FIGS. 6C and 6D show a state in which the opening 68 has been rotated by 90 ° about the central axis S from the state shown in FIGS. In this case, the imaginary line connecting the uppermost edge position P1 and the lowermost edge position P2 is orthogonal to the imaginary line connecting the uppermost edge position P1 and the lowermost edge position P2 in FIGS. Further, FIGS. 5E and 5F show a state in which the opening 68 has been rotated by 45 ° about the central axis S from the state shown in FIGS.

  5 (A) is a plan view of FIG. 4 (C), and FIG. 5 (B) is a cross-sectional view of the fitting portions of the original upper section 13 and the original section 14. 5C and 5D show a state in which the original upper joint 13 and the original joint 14 are rotated by 180 ° about the central axis S from the state of FIGS. 5A and 5B.

  In the present embodiment, when the fishing rod 10 is used, the hollow node 16 is in the posture shown in FIG. That is, when the fishing rod 10 is used, the end face 62 of the hollow node 16 faces in the lateral direction. Specifically, as shown in FIG. 5, the normal 63 of the end face 62 of the original node 14 exists on the vertical section 69 passing through the center 64 of the original upper section 13, and is along the vertical section 69.

[Effect of the embodiment]

  In the conventional fishing rod, the end surface of the main clause 14 is orthogonal to the axial direction, but in the fishing rod 10 according to the present embodiment, the end surface 62 of the original clause 14 is inclined by 45 ° with respect to the axial direction 7. ing. Since the end face 62 is inclined, the stress concentration generated in the fitting portion of the adjacent hollow nodes 16 is alleviated when the bending moment M acts on the original node 14. The same applies to the original clause 13.

  In the present embodiment, since the end face 62 of the original clause 14 is inclined, the nominal overlap L between the original clause 14 and the former upper clause 13 is defined as follows. That is, the distance from the center C of the end face 62 (a point intersecting the center line) to the rear end of the original upper section 13 is defined as the nominal overlap L. And in comparison with the overlap of the conventional fishing rod, both are the same. By defining the nominal overlap L in this manner, even if the end face 62 of the main clause 14 is cut obliquely, the fitting portion between the original clause 14 and the former upper clause 13 is compared with the conventional fishing rod. The weight is unchanged.

  As shown in FIG. 5, the normal 63 of the end face 62 of the original node 14 exists on a longitudinal section 69 passing through the center 64 of the original upper node 13. That is, the normal line 63 is along a neutral plane in which neither tensile stress nor compressive stress occurs in the original upper node 13. As shown in FIG. 1, when the bending moment M is applied so that the fishing rod 10 is convex upward, the opening 68 faces sideways as shown in FIG. The overlap L is the same as a conventional fishing rod, but stress concentration is avoided. Therefore, the stress value generated in the fitting portion between the original clause 14 and the original upper clause 13 is reduced. Moreover, there is no change in the weight of the fishing rod 10.

  By the way, the breakage of the fitting portion that occurs when the bending moment M is applied is due to the buckling of the portion where the compressive stress of the upper upper section 13 is generated. Then, when the bending moment M is applied, if the base section 14 supports the portion where the compressive stress of the original top section 13 is supported on a wider surface than the portion where the tensile stress is generated, the compression generated in comparison with the conventional fishing rod. The stress value is reduced. That is, in short, it is sufficient that the opening 68 is directed from the side to the upper side, that is, within a range rotated by ± 90 ° about the central axis S with reference to FIG. This also applies to the fitting portion between the first joint 12 and the original upper joint 13.

[Modification 1]

  In the present embodiment, the end faces 62 of both the original upper section 13 and the original section 14 are cut so as to be inclined with respect to the axial direction 7, but it is sufficient that at least the end face 62 of the original section 14 is inclined.

[Modification 2]

  In the present embodiment, each hollow node 16 has been spliced in a swing-out form, but is not limited to this, and may be a so-called joint-joint form. That is, the structure may be such that the rear end portion of the original upper clause 13 is inserted inside the front end portion of the original clause 14 and the both are fitted together. In addition, each hollow node 16 may have a hollow structure only in a portion that fits with an adjacent hollow node 16, and the other portion may have a solid structure.

[Modification 3]

  In the present embodiment, the fishing rod 10 has three hollow nodes 16, but the number of the hollow nodes 16 is not particularly limited.

[Modification 4]

  In the present embodiment, the fishing rod 10 is an outer guide type fishing rod, but may be a so-called inner guide type fishing rod.

S ... central axis 7 ... axial direction 10 ... fishing rod 11 ... fishing reel 12 ... first joint 13 ... second joint (former upper joint)
14 ... original section 41 ... tip part 44 ... butt part 62 ... end face 63 ... normal line 69 ... longitudinal section

Claims (3)

A fishing rod having a plurality of hollow nodes, the end of the small-diameter hollow node being fitted to the end of the large-diameter hollow node along the longitudinal direction,
The end of the large-diameter hollow node is cut obliquely so that the end surface of the hollow node is inclined at 30 ° to 55 ° with respect to the longitudinal direction,
A fishing rod in which an end surface of the large-diameter hollow node is arranged so as to open to a side where a tensile stress of the small-diameter hollow node is generated when a bending moment is applied to each hollow node.   The fishing rod according to claim 1, wherein the direction of the normal line of the end face of the large-diameter hollow node is along a longitudinal section passing through the center of the small-diameter hollow node. The large-diameter hollow node and the small-diameter hollow node are arranged on the butt side and tip side of the fishing rod,
The fishing rod according to claim 1 or 2, wherein the butt side end portion of the small-diameter hollow node is inserted and fitted inside the tip-side end portion of the large-diameter hollow node.

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