JP2018148828A - Tubular member having flexural rigidity being uniform in circumferential direction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tubular member having uniform flexural rigidity distribution in the circumferential direction.SOLUTION: A tubular member includes a tubular body formed of a prepreg sheet 11 having a winding initial side 11a and a winding terminal side 11b. The prepreg sheet 11 extends in the positive direction from the winding initial side 11a toward the winding terminal side 11b in the circumferential direction around the axial direction of the main body. The prepreg sheet is formed so that the winding initial side 11a may be a linear shape extending along the axial direction of the main body, and the winding terminal side 11b may have at least one protrusion 11b1 protruding in the positive direction more than the winding initial side 11a in the circumferential direction of the main body and at least one concave member 11b2 retreating in the negative direction more than the winding initial side 11a in the circumferential direction of the main body.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a tubular member having uniform bending rigidity in the circumferential direction. More specifically, the present invention relates to a tubular member that can be used as a fishing rod.

  2. Description of the Related Art Conventionally, fishing rod rods formed from fiber-reinforced resin prepreg sheets are known. This type of housing is formed by firing a prepreg sheet wound around a mandrel. The prepreg sheet is usually formed into a right triangle, a rectangle, or a trapezoid. The prepreg sheet is usually wound around the mandrel with the winding start side in a posture along the axial direction of the mandrel.

  In the casing manufacturing process, the prepreg sheet is wound around a mandrel so that the winding end side slightly overlaps the winding start side. Such a casing is thicker at the overlapping portion where the winding end side overlaps the winding start side than the portion other than the overlapping portion. This overlapping portion is commonly called spine.

  In the conventional case, since the winding start side is arranged in a direction extending along the axial direction of the mandrel, the spine is generally in the axial direction of the case at the position of the winding start side in the circumferential direction of the case. Appears to stretch. Therefore, the housing having the spine has a relatively high bending rigidity at a position where the spine in the circumferential direction exists, and has a relatively low bending rigidity at a position other than the spine in the circumferential direction.

  Thus, when the bending rigidity of a housing becomes non-uniform | heterogenous in the circumferential direction, the said housing will become easy to bend in the specific direction with weak bending rigidity. Such non-uniformity of the bending rigidity in the circumferential direction causes various problems such as inaccurate casting. Therefore, it is desirable that the fishing rod housing has a uniform bending rigidity in the circumferential direction.

  It has been proposed to realize uniform bending rigidity in the circumferential direction by changing the posture of the prepreg sheet with respect to the mandrel when wound around the mandrel. For example, Japanese Unexamined Patent Publication No. 2013-78295 (Patent Document 1) discloses a fishing rod housing formed by winding the winding start side and winding end side of a prepreg sheet so as to be inclined with respect to the axial direction of the mandrel. Has been. Japanese Patent Laying-Open No. 2002-153168 (Patent Document 2) discloses a fishing rod housing formed from a plurality of prepregs arranged such that the positions of the respective winding start sides are shifted in the circumferential direction. Japanese Patent Application Laid-Open No. 11-346602 (Patent Document 3) discloses a casing formed by winding a prepreg having a winding start side disposed so as to be inclined with respect to the axial center direction of the mandrel. It is disclosed. Japanese Patent Application Laid-Open No. 10-271934 (Patent Document 4) discloses a fishing rod housing formed by winding a pair of substantially right-angled triangular prepregs arranged so that the hypotenuses are opposed to each other. ing.

JP 2013-78295 A JP 2002-153168 A JP 11-346602 A Japanese Patent Laid-Open No. 10-271934

  In the prior art described above, since the prepreg sheet is wound around the mandrel in a posture in which the winding start side of the prepreg sheet is not parallel to the central axis of the mandrel, it is not easy to align the prepreg sheet with respect to the mandrel.

  The object of the present invention is to solve or mitigate at least one of the above-mentioned problems. One specific object of the present invention is to provide a tubular member having a uniform bending stiffness distribution in the circumferential direction. One of the more specific objects of the present invention is to produce a tubular member having a uniform bending rigidity distribution in the circumferential direction from a prepreg sheet in which the winding start side is arranged in a posture parallel to the central axis of the mandrel. That is. Other objects of the present invention will become apparent by referring to the entire specification.

  A tubular member according to an embodiment of the present invention includes a tubular main body formed from a prepreg sheet having a winding start side and a winding end side. The prepreg sheet extends in a positive direction from the winding start side toward the winding end side in the circumferential direction around the axial direction of the main body, and the winding start side extends along the axial direction of the main body. The winding end side is at least one convex part projecting in the positive direction from the winding start side in the circumferential direction of the main body, and the winding start side in the circumferential direction of the main body than the winding start side. And at least one recess recessed in the negative direction. The at least one convex portion and the at least one concave portion may be formed only in a part of the main body in the axial direction, or may be formed over the entire axial length of the main body.

  In this embodiment, since the at least one convex portion protrudes in the positive direction from the winding start side in the circumferential direction, the body has a relative bending rigidity at the position of the at least one convex portion in the circumferential direction. Become bigger. On the other hand, since the at least one recess is retracted in the negative direction from the winding start side in the circumferential direction, the body has a relatively small bending rigidity at the position of the at least one recess in the circumferential direction. As described above, at the position of the winding start side in the circumferential direction of the main body, the bending rigidity is increased by the at least one convex portion, while the bending rigidity is decreased by the at least one concave portion. Therefore, at the position of the winding start side in the circumferential direction of the main body, the influence of the increase in bending rigidity and the influence of the decrease are offset. Thus, in this embodiment, the occurrence of spines near the winding start side in the circumferential direction is prevented. Thereby, the tubular member according to the embodiment has a more uniform bending rigidity distribution in the circumferential direction than in the related art.

  In the tubular member according to an embodiment of the present invention, an area of one of the at least one protrusion is equal to an area of one of the at least one recess adjacent to the one protrusion. Configured.

  According to the embodiment, the effect of increasing the bending rigidity due to one of the at least one protrusion is in conflict with the effect of decreasing the bending rigidity due to one recess adjacent to the one protrusion. . Thereby, a tubular member having a more uniform bending rigidity distribution in the circumferential direction is obtained.

  The tubular member by one Embodiment of this invention is comprised so that the said winding end side may have the said convex part and multiple said recessed parts, respectively. In the embodiment, the convex portions included in the plurality of convex portions are alternately arranged along the axial direction of the main body with the concave portions included in the plurality of concave portions.

  According to the embodiment, the influence of the increase in bending rigidity and the influence of the decrease can be offset by the adjacent convex portions and concave portions.

  The tubular member according to an embodiment of the present invention is configured such that a total area of the plurality of convex portions is equal to a total area of the plurality of concave portions.

  According to the embodiment, it is possible to antagonize the effect of increasing the bending rigidity due to the plurality of convex portions and the effect of decreasing the bending rigidity due to the plurality of concave portions. Thereby, a tubular member having a more uniform bending rigidity distribution in the circumferential direction is obtained.

  In the tubular member according to an embodiment of the present invention, the same number of the plurality of convex portions and the plurality of concave portions are formed.

  According to the embodiment, it is possible to antagonize the effect of increasing the bending stiffness due to the plurality of convex portions and the effect of reducing the bending stiffness due to the same number of concave portions as the plurality of convex portions. Thereby, a tubular member having a more uniform bending rigidity distribution in the circumferential direction is obtained.

  A fishing rod according to an embodiment of the present invention has a housing made of a tubular member according to the above-described embodiment.

  According to the embodiment, a fishing rod having a uniform bending rigidity distribution in the circumferential direction can be provided. In the fishing rod, problems due to uneven bending rigidity in the circumferential direction are eliminated or alleviated. For example, according to the fishing rod, more accurate casting can be performed.

  In one embodiment of the present invention, a tubular member in which the occurrence of spine is prevented is provided. In another embodiment of the present invention, it can be more easily manufactured than such a tubular member.

It is a figure showing typically tubular member 1 concerning one embodiment of the present invention. It is a schematic diagram for demonstrating the manufacturing method of the main body 10a of the tubular member 1 of FIG. It is sectional drawing which cut | disconnected the main body 10 of the tubular member 1 of FIG. 1 by the surface perpendicular to the central axis A which passes through the convex part 11b1. It is sectional drawing which cut | disconnected the main body 10 of the tubular member 1 of FIG. 1 in the surface perpendicular to the central axis A which passes the boundary of the convex part 11b1 and the recessed part 11b2. It is sectional drawing which cut | disconnected the main body 10 of the tubular member 1 of FIG. 1 by the surface perpendicular to the central axis A which passed the recessed part 11b2. It is a figure which shows typically the prepreg sheet | seat 21 by other embodiment of this invention. It is a figure which shows typically the prepreg sheet | seat 31 by other embodiment of this invention. It is a figure showing typically fishing rod 100 produced using tubular member 1 concerning one embodiment of the present invention.

  Hereinafter, various embodiments of the present invention will be described with reference to the drawings as appropriate. In addition, the same referential mark is attached | subjected to the component which is common in each drawing. It should be noted that the drawings are not necessarily drawn to scale for convenience of explanation.

  Drawing 1 is a figure showing typically tubular member 1 concerning one embodiment of the present invention. As will be described later, the tubular member 1 can be used for fishing rod bodies and various other purposes. A tubular member 1 according to an embodiment of the present invention includes an elongated tubular main body 10. The main body 10 is a hollow tubular member that extends from one end 10a to the other end 10b. In FIG. 1, the central axis of the main body 10 is indicated by reference symbol A.

  The main body 10 is formed by firing a prepreg sheet 11 wound around a mandrel M, as will be described later. The prepreg sheet 11 is formed such that the winding end side has a zigzag shape. Therefore, a structure corresponding to the zigzag winding end side of the prepreg sheet 11 before firing remains in the main body 10. The structure corresponding to the zigzag winding end side of the prepreg sheet 11 shown in FIG. 1 is denoted by the same reference numerals as those attached to the prepreg sheet 11 of FIG. .

  FIG. 2 is a schematic diagram for explaining a manufacturing method of the main body 10. In order to manufacture the main body 10, first, a mandrel M and a prepreg sheet 11 are prepared. The illustrated mandrel M has a tapered shape. In this specification, when referring to the width and length of the prepreg sheet 11, the description will be made with reference to the W direction (width direction) and L direction (length direction) shown as orthogonal coordinates in FIG. 2. A central axis B of the mandrel M extends in a direction parallel to the L direction. The W direction is orthogonal to the L direction.

  The prepreg sheet 11 is a sheet-like member in which reinforcing fibers are impregnated with a matrix resin component. The reinforcing fiber is, for example, carbon fiber or glass fiber. The matrix resin component is, for example, an epoxy resin resin, a bisphenol A resin, a bisphenol F resin, or a combination thereof. The matrix resin component may contain a curing agent. The curing agent is, for example, an amine compound or an acid anhydride. As the prepreg sheet 11, a prepreg obtained by impregnating carbon fiber with an epoxy resin can be preferably used. The thickness of the prepreg sheet 11 may be, for example, 20 μm to 300 μm. A suitable commercial product can also be used as the prepreg sheet 11. The material and thickness of the prepreg sheet 11 applicable to the present invention are not limited to those specified in the present specification, and any known prepreg sheet can be used as the prepreg sheet 11 as long as it does not contradict the gist of the present invention.

  The main body 10 is formed by removing the mandrel M after winding the prepreg sheet 11 around the mandrel M and baking it.

  The prepreg sheet 11 has a triangular shape, a rectangular shape, a polygonal shape other than these, or a known arbitrary shape other than these. In the illustrated embodiment, the prepreg sheet 11 is formed in a substantially trapezoidal shape, and includes a first side 11a, a second side 11b, a third side 11c, and a fourth side 11d. The prepreg sheet 11 is formed such that the first side 11a, the third side 11c, and the fourth side 11d are linear, and the second side 11b is zigzag.

  The prepreg sheet 11 is arranged with respect to the mandrel M so that the first side 11a thereof is parallel to the central axis B of the mandrel M, and is wound around the mandrel M in this arrangement. Since the prepreg sheet 11 is wound around the mandrel M from the first side 11a, the first side 11a may be referred to as a winding start side in the present specification. In the present specification, the second side 11b facing the winding start side 11a may be referred to as a winding end side 11b. Since the winding start side 11 a is arranged with respect to the mandrel M so as to be parallel to the central axis B of the mandrel M, in the main body 10, the winding start side 11 a is in a direction parallel to the central axis A of the main body 10. Stretch.

  In the illustrated embodiment, the winding start side 11a is linearly formed over its entire length, but the winding start side 11a is at least a part thereof (for example, a portion of 50% or more of the total length of the winding start side 11a, 60% or more, 70% or more, 80% or more, 90% or more, or 90% or more) is formed in a straight line, and the linearly formed part is a mandrel. What is necessary is just to arrange | position with respect to the mandrel M so that it may become parallel to the central axis B of M. For example, the prepreg sheet 11 may be formed so that the vicinity of the fourth side 11d is wide in order to reinforce the vicinity of the end portion 10b of the main body 10. In this case, the winding start side 11a is near the center of the mandrel M near the fourth side 11d (for example, a range from the fourth side 11d of the winding start side 11a to 20% of the total length of the winding start side 11a). It is inclined with respect to the axis B.

  The third side 11 c of the prepreg sheet 11 corresponds to one end portion 10 a of the main body 10, and the fourth side 11 d of the prepreg sheet 11 corresponds to the other end portion 10 b of the main body 10. In the illustrated example, the prepreg sheet 11 is formed so that the third side 11c is shorter than the fourth side 11d.

  In one embodiment of the present invention, the winding end side 11b includes at least one convex portion 11b1 protruding outward from the prepreg sheet 11 (opposite direction to the winding start side 11a) from a virtual side 11e facing the winding start side 11a. And at least one recess 11b2 that recedes from the virtual side 11e to the inside of the prepreg sheet (in the direction of the winding start side 11a). The virtual side 11e is a virtual side corresponding to the winding end side of the prepreg sheet 11 formed so as to be wound around the mandrel M by an integer ply. When the prepreg sheet 11 is wound around the mandrel M, the virtual side 11e1 comes to the same position as the winding start side 11a in the circumferential direction. For example, the virtual side 11e is in a position corresponding to the position of the winding end side of the prepreg sheet 11 formed so as to be wound around the mandrel M by two plies. That is, if the prepreg sheet 11 is cut along the virtual side 11e, the prepreg sheet 11 is wound around the mandrel M by an integer ply if there is no deviation in the cutting position and no manufacturing error.

  Since the convex portion 11b1 protrudes outward of the prepreg sheet 11 from the imaginary side 11e, the prepreg sheet 11 is wound by the protruding width W1 of the convex portion 11b1 more than the integer ply number at the position of the convex portion 11b1. Will be. The protruding width W1 of the convex portion 11b1 from the virtual side 11e is a width that does not exceed the length corresponding to one ply. In one embodiment of the present invention, the protrusion width W1 is about 1% to 10% of the circumferential length of the outer surface of the main body 10.

  Since the recess 11b2 is retracted inward of the prepreg sheet 11 with respect to the imaginary side 11e, the prepreg sheet 11 is wound at the position of the recess 11b2 by a retraction width W2 of the recess 11b1 less than the integer ply number. Become. The receding width W2 from the virtual side 11e of the recess 11b2 is a width that does not exceed one ply. In one embodiment of the present invention, the receding width W2 is about 1% to 10% of the circumferential length of the outer surface of the main body 10.

  In the illustrated embodiment, a plurality of convex portions 11b1 and a plurality of concave portions 11b2 are arranged over the entire length of the winding end side 11b. The winding end side 11b is formed such that each of the plurality of convex portions 11b1 and each of the plurality of concave portions 11b2 appear alternately in the length direction of the prepreg sheet 11 (direction along the winding start side 11a). . In one embodiment of the present invention, it is desirable that the same number of convex portions 11b1 as the concave portions 11b2 are provided.

  The convex portion 11 b 1 and the concave portion 11 b 2 may be arranged over the entire length in the length direction of the prepreg sheet 11, or may be arranged only in a part in the length direction of the prepreg sheet 11.

  The zigzag winding end side 11b described above can be formed using an ultrasonic cutter, a cutting device provided with a metal blade, or any other known device.

  With further reference to FIGS. 3-5, the body 10 of the tubular member 1 according to one embodiment of the present invention will be described in further detail. 3 is a cross-sectional view of the tubular member 1 of FIG. 1 cut along a plane that passes through the convex portion 11b1 and is perpendicular to the central axis A, and FIG. 4 is a plane that passes through the concave portion 11b2 and is perpendicular to the central axis A. FIG. 5 is a cross-sectional view of the tubular member 1 of FIG. 1 cut along the main body 10. FIG. 5 is a cross-sectional view of the tubular member 1 of FIG. FIG.

  In the illustrated embodiment, the main body 10 is formed from a prepreg sheet 11 wound about two plies. Therefore, the main body 10 includes the first layer 10c and the second layer 10d disposed outside the first layer. The main body 10 can be formed from a prepreg sheet wound by an arbitrary number of plies.

  An arbitrary layer (not shown) can be formed on the inner peripheral surface and / or the outer peripheral surface of the main body 10. For example, various coating layers and protective layers may be formed on the outer peripheral surface of the main body 10. The main body 10 may have a layer formed from a prepreg sheet other than the prepreg sheet 11 inside or outside the prepreg sheet 11. Such additional prepreg sheet layers may be provided to reinforce part or all of the body 10, to adjust the tone of the body 10, or for various other reasons.

  The boundary line that distinguishes the first layer 10c and the second layer 10d is provided for convenience of explanation, and in the main body 10, such a layer structure may not be observed. For example, when the prepreg sheet 11 wound around the mandrel M by a plurality of plies is baked, the boundary between layers of the prepreg sheet may not be clearly observed. A tubular body in which such a boundary between layers is not observed can also be included in the main body 10 applicable to the present invention.

  As shown in FIG. 3, the prepreg sheet 11 is wound around the central axis A in the counterclockwise direction. That is, the prepreg sheet 11 extends in the counterclockwise direction from the winding start side 11a to the winding end side 11b in the circumferential direction around the central axis A. In this specification, the direction from the winding start side 11a to the winding end side 11b in the circumferential direction around the central axis A (counterclockwise direction around the central axis A in the example of FIG. 3) is the circumferential direction. The direction from the winding end side 11b to the winding start side 11a (clockwise direction around the central axis A in the example of FIG. 3) may be referred to as the negative direction of this circumferential direction. As described above, the protruding portion 11b1 protrudes outward of the prepreg sheet 11 by the protruding width W1 rather than the integer ply (2 plies in the illustrated example). Therefore, as shown in the drawing, the prepreg sheet 11 is wound by an extra protrusion width W1 from the position of the winding start side 11a at the position of the convex portion 11b1 in the length direction (L direction). As a result, the main body 10 has three plies in which the thickness at the position of the winding start side 11a in the circumferential direction is thicker than the reference two-ply thickness at the position of the convex portion 11b1 in the length direction (L direction). Has a thickness of minutes.

  As described above, the recess 11b2 is retracted by the retraction W2 inward of the prepreg sheet 11 rather than the integer ply (2 plies in the illustrated example). Therefore, as shown in FIG. 5, the prepreg sheet 11 is wound by a retracted width W2 less at the position of the recess 11b2 in the length direction (L direction). As a result, the main body 10 has one ply thickness that is thinner than the two ply thicknesses at the position of the winding start side 11a in the circumferential direction at the position of the concave portion 11b2 in the length direction (L direction). It has a thickness.

  At the boundary between the convex portion 11b1 and the concave portion 11b2, as shown in FIG. 4, the prepreg sheet 11 is wound by an integer ply (2 plies in the example of FIG. 2). For this reason, the main body 10 has the same thickness as the reference thickness at the position of the winding start side 11a in the circumferential direction at the boundary position between the convex portion 11b1 and the concave portion 11b2 in the length direction (L direction). Has a thickness of

  The prepreg sheet 11 in one embodiment of the present invention is formed such that the area of the convex part 11b1 and the area of at least one of the concave parts 11b2 adjacent to the convex part 11b1 are the same. When the area of the convex portion 11b1 and the concave portion 11b2 adjacent thereto are the same, the effect of the convex portion 11b1 that works to increase the bending rigidity at the position of the winding start side 11a in the circumferential direction of the main body 10 and the work that reduces the bending rigidity. The effect of the recess 11b2 antagonizes. In other words, the bending rigidity at the position of the winding start side 11a in the circumferential direction of the main body 10 is locally increased by the convex portion 11b1, but conversely decreases by the same degree by the concave portion 11b2. The effect of increasing the bending stiffness and the effect of reducing the bending stiffness are offset, and the convex portion 11b1 and the concave portion 11b2 adjacent thereto have a neutral effect on the bending stiffness of the main body 10 in total. In the present specification, even if there is a deviation of 10% or less between the area of the convex portion 11b1 and the area of the concave portion 11b2, it does not prevent the two areas from being the same. This is because an increase or decrease in bending rigidity caused by such a difference in area often has no practical effect when the tubular member 1 is used.

  When the prepreg sheet 11 has a plurality of convex portions 11b1 and a plurality of concave portions 11b2, the prepreg sheet 11 has the same total area of the plurality of convex portions 11b1 and the area of the plurality of concave portions 11b2. It may be formed as follows. Thereby, it is possible to antagonize the influence of the convex part 11b1 that works to increase the bending rigidity at the position of the winding start side 11a in the circumferential direction of the main body 10 and the influence of the concave part 11b2 that works to reduce the bending rigidity.

  The main body 10 is configured such that the convex portions 11 b 1 and the concave portions 11 b 2 appear alternately along the length direction of the main body 10 at the position of the winding start side 11 a in the circumferential direction. Therefore, the main body 10 has a portion that is thicker by one ply than the thickness of the reference ply (2 plies in the illustrated example) at the position of the winding start side 11a in the circumferential direction, and is thinner by one ply than the thickness of the reference ply. The portions are configured to appear alternately along the length direction. Therefore, the bending rigidity at the position of the winding start side 11a in the circumferential direction of the main body 10 is increased by the convex portion 11b1, and is decreased by the concave portion 11b2. In the main body 10, the bending rigidity equivalent to the bending rigidity obtained by the thickness of the reference ply is realized by antagonizing the effect of increasing the bending rigidity by the convex portion 11b1 and the effect of decreasing the bending rigidity by the concave portion 11b2. Is done. In the circumferential direction of the main body 10, a portion other than the periphery of the winding start side 11 a has a reference ply thickness. Therefore, the main body 10 has bending rigidity corresponding to the thickness of the reference ply at any position in the circumferential direction. Thus, the bending rigidity of the main body 10 is uniformly distributed in the circumferential direction.

  In one embodiment of the present invention, the prepreg sheet 11 is arranged with respect to the mandrel M so that the first side 11a is parallel to the central axis B of the mandrel M, and the mandrel M is wound around in this arrangement. Turned. Therefore, the alignment of the prepreg sheet 11 with respect to the mandrel M is easy.

  FIG. 6 is a diagram schematically showing a prepreg sheet 21 according to another embodiment of the present invention. The prepreg sheet 21 can be used in place of the prepreg sheet 11 or together with the prepreg sheet 11. That is, in another embodiment of the present invention, at least a part of the tubular member 1 is formed from the prepreg sheet 21.

  As illustrated, the prepreg sheet 21 is formed to have a first side 21a, a second side 21b, a third side 21c, and a fourth side 21d. The prepreg sheet 21 is different from the prepreg sheet 11 in that the second side 21b is formed so as not to have an acute angle. In the prepreg sheet 21, the first side 21a is the winding start side, and the second side 21b is the winding end side. If the side of the prepreg sheet 21 has an acute angle, when the main body 10 is bent, stress may be concentrated in the vicinity of the angle. Since the winding end side 21b is formed so as not to have an acute angle, stress concentration does not occur when the main body 10 is bent.

  The prepreg sheet 21 is arranged with respect to the mandrel M such that the first side 21a (winding start side 21a) is parallel to the central axis B of the mandrel M, and is wound around the mandrel M in this arrangement. The

  The winding end side 21b includes at least one convex portion 21b1 projecting from the virtual side 21e facing the winding start side 21a to the outside of the prepreg sheet 21 (in the direction opposite to the winding start side 21a), and the prepreg sheet from the virtual side 21e. And at least one recess 21b2 that recedes inward (in the direction of the winding start side 21a). The virtual side 21e is a virtual side corresponding to the winding end side of the prepreg sheet 11 formed so as to be wound around the mandrel M by an integer ply.

  In one embodiment of the present invention, as shown in the drawing, a plurality of convex portions 21b1 and a plurality of concave portions 21b2 are arranged over the entire length of the winding end side 21b. The winding end side 21b is formed such that each of the plurality of convex portions 21b1 and each of the plurality of concave portions 21b2 alternately appear in the length direction of the prepreg sheet 21 (direction along the winding start side 21a). The convex portion 21b1 and the concave portion 21b2 may be provided not only in the entire length of the winding end side 21b but only in a partial region in the length direction.

  The prepreg sheet 21 in one embodiment of the present invention is formed such that the area of the convex portion 21b1 and the area of at least one of the concave portions 21b2 adjacent to the convex portion 21b1 are the same. When the prepreg sheet 31 has a plurality of convex portions 21b1 and a plurality of concave portions 21b2, the prepreg sheet 21 has the same total area of the plurality of convex portions 21b1 and the area of the plurality of concave portions 21b2. Formed as follows.

  Also in the tubular member 1 (or the main body 10) formed from the prepreg sheet 21 shown in FIG. 6, the influence of the increase in bending rigidity and the influence of the decrease are offset by the convex portions 21b1 and the concave portions 21b2. Therefore, the bending rigidity of the tubular member 1 (or the main body 10) formed from the prepreg sheet 21 is uniformly distributed in the circumferential direction.

  FIG. 7 is a view schematically showing a prepreg sheet 31 according to another embodiment of the present invention. The prepreg sheet 31 can be used in place of or together with the prepreg sheet 11 and the prepreg sheet 21. That is, in this embodiment, at least a part of the tubular member 1 is formed from the prepreg sheet 31.

  As illustrated, the prepreg sheet 31 is cut so as to have a first side 31a, a second side 31b, a third side 31c, and a fourth side 31d. In the prepreg sheet 31, the first side 31a is the winding start side, and the second side 31b is the winding end side. The prepreg sheet 31 is different from the prepreg sheet 11 and the prepreg sheet 21 in that the pattern that repeatedly appears on the winding end side 31b has a rectangular shape.

  The prepreg sheet 31 is arranged with respect to the mandrel M such that the first side 31a (winding side 31a) is parallel to the central axis B of the mandrel M, and is wound around the mandrel M in this arrangement. The

  The winding end side 31b includes at least one convex portion 31b1 protruding outward from the prepreg sheet 31 (in a direction opposite to the winding start side 31a) from a virtual side 31e facing the winding start side 31a, and the prepreg sheet from the virtual side 31e. And at least one recess 31b2 that recedes inward (in the direction of the winding start side 31a). The virtual side 31e is a virtual side corresponding to the winding end side of the prepreg sheet 31 formed so as to be wound around the mandrel M by an integer ply. The rectangular element repeatedly appearing at the winding end side 31b has an inclined side 31c inclined with respect to the virtual side 31e and a parallel side 31d parallel to the virtual side 31e. The inclined side 31c is a side where one side 31c1 of the convex portion 31b1 and one side 31c2 of the concave portion 31b2 are connected. In one embodiment of the present invention, the winding end side 31b is formed so that the inclined side 31c is orthogonal to the virtual side 31e.

  In one embodiment of the present invention, as shown in the drawing, a plurality of convex portions 31b1 and a plurality of concave portions 31b2 are arranged over the entire length of the winding end side 31b. The winding end side 31b is formed such that each of the plurality of convex portions 31b1 and each of the plurality of concave portions 31b2 appear alternately in the length direction of the prepreg sheet 31 (direction along the winding start side 31a). The convex portion 31b1 and the concave portion 31b2 may be provided not only in the entire length of the winding end side 31b but only in a partial region in the length direction.

  The prepreg sheet 31 in one embodiment of the present invention is formed such that the area of the convex part 31b1 and the area of at least one of the concave parts 31b2 adjacent to the convex part 31b1 are the same. When the prepreg sheet 31 has a plurality of convex portions 31b1 and a plurality of concave portions 31b2, the prepreg sheet 31 has the same total area of the plurality of convex portions 31b1 and the area of the plurality of concave portions 31b2. Formed as follows.

  Also in the tubular member 1 (or the main body 10) formed from the prepreg sheet 31 shown in FIG. 7, the influence of the increase in bending rigidity and the influence of the decrease are offset by the convex portions 31b1 and the concave portions 31b2. Therefore, the bending rigidity of the tubular member 1 (or the main body 10) formed from the prepreg sheet 31 is uniformly distributed in the circumferential direction.

  The shape of the prepreg sheet explicitly described in this specification is merely an example, and the shape of the prepreg sheet applied to the present invention is not limited to the above.

  The tubular member 1 can be used in various industrial products. The tubular member 1 can be used as, for example, a badminton racket shaft, a golf club shaft, or a fishing rod housing. The tubular member 1 is configured not to generate spine, and is difficult to have strong bending rigidity in a specific bending direction. Therefore, when the tubular member 1 is used as a fishing rod rod, for example, it is more accurate. Casting is realized.

  FIG. 8 is a diagram schematically showing a fishing rod 100 according to an embodiment of the present invention. The fishing rod 1 includes a tubular member 1 according to an embodiment of the present invention as a rod body. The fishing rod 1 is configured in the same manner as a conventional fishing rod except that the rod body is a tubular member 1. For example, as shown in FIG. 8, a fishing rod 1 according to an embodiment of the present invention includes a rod body 101, a reel 102 that is detachably attached to the rod body 101 via a reel sheet 103, And a grip 104 attached to the base end side of the body 101. The housing 101 may include a plurality of joined blanks, or may be composed of a single blank. The tubular member 1 described above is used as a blank constituting the casing 101.

  The dimensions, materials, and arrangement of each component described in this specification are not limited to those explicitly described in the embodiments, and each component may be included in the scope of the present invention. Can be modified to have different dimensions, materials, and arrangements. In addition, components that are not explicitly described in the present specification can be added to the described embodiments, or some of the components described in the embodiments can be omitted.

DESCRIPTION OF SYMBOLS 1 Tubular member 10 Main body 11,21,31 Pre-preg sheet | seat 11a, 21a, 31a Winding start side 11b, 21b, 31b Winding end side 100 Fishing rod

Claims (8)

A tubular body formed from a prepreg sheet having a winding start side and a winding end side;
The prepreg sheet is
In the circumferential direction around the axial direction of the main body, it extends in the positive direction from the winding start side toward the winding end side,
At least a part of the winding start side becomes a linear shape extending along the axial direction of the main body,
The winding end side protrudes in the positive direction from the winding start side in the circumferential direction of the main body, and retreats in the negative direction from the winding start side in the circumferential direction of the main body. Having at least one recess,
A tubular member formed as described above.   2. The tubular member according to claim 1, wherein an area of one of the at least one protrusion is equal to an area of one of the at least one recess adjacent to the one protrusion. The winding end side includes a plurality of the convex portions and the concave portions, respectively.
The tubular portions according to claim 1 or 2, wherein the convex portions included in the plurality of convex portions are alternately arranged along the axial direction of the main body with the concave portions included in the plurality of concave portions. Element.   The tubular member according to claim 3, wherein a total area of the plurality of convex portions is equal to a total area of the plurality of concave portions.   The tubular member according to any one of claims 1 to 4, wherein the same number of the plurality of convex portions and the plurality of concave portions are formed.   The tubular member according to any one of claims 1 to 5, wherein the at least one convex portion and the at least one concave portion are formed only in a part in the axial direction of the main body.   The tubular member according to any one of claims 1 to 5, wherein the at least one convex portion and the at least one concave portion are formed over the entire axial length of the main body.   A fishing rod having a housing made of the tubular member according to any one of claims 1 to 7.

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