JP4229390B2 - Tubular body - Google Patents

Description

  The present invention relates to a fiber reinforced resin tubular body, that is, a fishing rod, a golf club shaft, a racket frame such as tennis, a bicycle frame, and the like.

Conventionally, in a fiber reinforced plastic tubular body such as a soot tube, in order to provide a bending rigidity difference at the position in the tip direction, the type of reinforcing fiber is changed, its direction of orientation is changed, and the number of windings of the prepreg is set. I have changed. Among these, changing the type and direction of the reinforcing fiber at the position in the front direction is difficult to cope with because a boundary occurs at the changing portion. In comparison with this, it is easy to change the number of windings of the prepreg itself, for example, winding the tip part twice and the base part three times. In addition, the following Patent Document 1 by the present applicant discloses a structure in which the bending rigidity of the joint portion is reduced to reduce the stress concentration on the counterpart side pipe.
JP 2003-274802 A

However, in the method of changing the number of prepreg windings described above, the thickness at each part can be increased by making the number of windings of the tip part and the base part, which are end parts of the prepreg, substantially an integer such as 2 or 3 times. Can be made uniform, and there is no directionality in the bending rigidity at these parts, but in the middle region, the number of turns is between 2 and 3, and the directionality is Occurs. A tubular body such as a soot tube having a remarkable direction of bending rigidity cannot generally be made into a product, and is likely to bend a material during manufacturing by heating and baking, and easily becomes a defective product.
Therefore, the problem to be solved is that the bending rigidity at the front-rear direction position is changed when the bending rigidity at the position of the tubular body in the front-rear direction (same meaning as the original direction) is changed by means of different average thickness in the circumferential direction. And a difference in bending rigidity in the circumferential direction, that is, a tubular body in which the bending directionality is reduced as much as possible.

  In the invention which concerns on Claim 1, it is formed by winding a prepreg, and the bending rigidity of the original side is the same as that of a front side, or is a higher fiber-reinforced resin tubular body, Comprising: A part of said prepreg A substantially rectangular or substantially trapezoidal through-ply prepreg is provided over a predetermined length range on the front side, and a plurality of substantially triangular cut portions with one side positioned at the position of the leading edge of the through-ply prepreg are provided. In the case where the tubular body is mounted, the single-walled portions composed of the remaining region portions adjacent to the cut portions in the through-ply prepreg are dispersed at approximately equal intervals in the circumferential direction, and are circular in cross section. Each of the circumferential widths is substantially the same, and the former direction position corresponding to the apex portion that is not located on the one side of the substantially triangular cut portion of the prepreg has the same or different size as the cut portion, Position one vertex of a substantially triangular prepreg piece having the same length in the original direction, and superpose and bond to the through-ply prepreg while positioning one side not having the vertex on the original side far from the leading edge. Each piece of the laminated substantially triangular prepreg pieces in the tubular body is distributed at approximately equal intervals in the circumferential direction, and the circumferential width is substantially the same in the cross section. A tubular body is provided.

A part of a prepreg is the case of the entire prepreg of a plurality of prepregs, and the case where the number of windings of one prepreg exceeds one and is two times, three times, etc. There is a case that it is a part of one time.
Through ply prepreg is a prepreg that can be said to have substantially (substantially) the same number of turns from the leading edge to the base edge. This abbreviation means that the difference in the number of turns between the leading edge and the base edge is 15% or less. Say. Preferably it is 10% or less. However, since the above-mentioned predetermined length range on the front side has a cut portion, the cut portion is present at the upper and lower edge portions (the prepreg side portion along the length direction of the tubular body) of the prepreg (FIG. 4 of the embodiment example). If you like). In this case, it is considered in the area between the original direction position (T2 in FIG. 4) and the original edge position (T3) corresponding to the vertex position of the cut portion, and the difference between the tip of this range and the original number of windings. Is 8% or less. Preferably it is 5% or less.

  In the invention which concerns on Claim 2, the said substantially triangular prepreg piece of the said bonding provides the tubular body of Claim 1 which is the same dimension as the cut part of the said substantially triangular.

According to claim 1 of the present invention, in a general prepreg that is commercially available, the front side and the original side have the same thickness and the same rigidity. In addition, the apex portion of the approximately triangular prepreg piece is positioned and bonded to the position in the front direction corresponding to the position of the apex portion of the cut portion. If the prepreg is made, the average rigidity of the tip part will be lower than the commercially available prepreg by the cut amount, and in the former region corresponding to the range where the substantially triangular prepreg pieces are bonded, the average rigidity is commercially available. It is improved by the amount pasted than the prepreg. Therefore, if this is wound in a tubular shape, a rigidity difference can be provided more effectively in the front direction than when only a commercially available prepreg is used, and the rigidity difference design of the tubular body is facilitated.
In addition, since the apex of the substantially triangular prepreg piece is positioned at the position of the apex of the apex of the cut, the bending rigidity changes continuously at this boundary, and from the front side having the cut The change in bending rigidity is a gradual change because it is a change along a substantially triangle until it reaches the original side where the substantially triangular prepreg pieces are superposed.
Moreover, this prepreg is a through prepreg, and each piece of the flesh formed from the remaining area of each cut part and each piece of the piece to be bonded are uniformly distributed in the circumferential direction, and the width dimension in the circumferential direction. Therefore, the bending rigidity in the circumferential direction is not uniform, that is, the direction of the bending is prevented.

  According to the second aspect, the cut portion can be used as a substantially triangular prepreg piece to be bonded as it is, so that the utilization efficiency of the prepreg can be improved and the number of manufacturing steps can be reduced, which helps to reduce the cost of the tubular body.

  Hereinafter, the present invention will be described in detail with reference to the drawings. One embodiment of the fiber-reinforced resin tubular body according to the present invention is formed using a polymerized prepreg shown in FIG. The cross section of the leading edge of the tubular body is shown in FIG. 2, and the cross section of the base edge is shown in FIG. The overlapping of the winding start end and end of the prepreg in FIGS. 2 and 3 is not shown. First, for convenience of illustration, the prepreg of FIG. 1 has a short length in the left-right direction (length in the front direction), but has four corner points P1, P2, P4, and P5. A prepreg (PR1 ′) serving as a base having a rectangular shape, more precisely a trapezoidal shape, which is partitioned by four sides H2, H4, H1, and H3 is prepared. This base prepreg is a through prepreg, which is wound once, and the remaining area excluding the substantially triangular cut portion is also referred to as a base prepreg as will be described later, but the reference symbol PR1 excluding the dash It is said. The side H1 is a leading edge, the side H2 is a base edge (rear edge), the side H3 is an upper edge (side along the length of the tubular body), and the side H4 is a lower edge. An intermediate point of the side H3 is a point P6, and an intermediate point of the H4 is a point P3. Each prepreg is made of a synthetic resin such as an epoxy resin and reinforced with reinforcing fibers such as carbon fibers, and the base prepreg is an aligned fiber sheet in which the reinforcing fiber direction extends in the front direction (front-rear direction). is there.

  This trapezoidal base prepreg has one vertex at an intermediate position between the leading edge position T1 and the leading edge position T3, that is, a position T2 that is ½ of the leading edge length L. Four triangular cut portions whose sides are located on the leading edge H1 are provided, and the base prepreg after the cut is PR1. That is, four triangular portions connecting points A1, A2, A3, B1, B2, B3, C1, C2, C3, and D1, D2, D3 are cut. The length of one side of each triangle on the leading edge H1 is the same, and the intervals between the triangles are set to be equal when the prepreg is wound in a tubular shape. That is, the distance between the points A2 and B3, the distance between the points B2 and C3, and the distance between the points C2 and D3 are the same (1), the distance between the points P5 and A3, and the distance between the points D2 and P4 Half (0.5). Further, the distance between the points A1 and B1, the distance between the points B1 and C1, the distance between the points C1 and D1 at the position T2 is the same, and the distance between the remaining points P6 and A1 and the distance between the points D1 and P3 are Half of them.

  HA, HAB, HBC, HCD, HD are the remaining area portions adjacent to the upper and lower sides of the cut portions of the base prepreg. The triangular prepreg pieces PR2A, PR2B, PR2C, and PR2D that have been cut out are overlaid on the region between the base prepreg positions T2 and T3 (the region on the original side). That is, in this example, the vertex (for example, A1) of the cut portion and the vertex that was located at the original A1 of the cut triangular prepreg piece PR2A are positioned at the same A1 position, and one side (for example, for example, this vertex faces) The side corresponding to the side connecting points A3 and A2) is positioned on the base edge H2 of the base prepreg. The intervals between the triangular prepreg pieces are equal when the prepreg is wound into a tubular shape. That is, the distance between the points A2 ′ and B3 ′, the distance between the points B2 ′ and C3 ′, and the distance between the points C2 ′ and D3 ′ are the same (1), and the distance between the points P1 and A3 ′ The distance between D2 'and P2 is half (0.5) of them. Furthermore, the backing prepreg PR3 whose reinforcing fiber direction is the vertical direction is polymerized on the back surface of the base prepreg to facilitate handling of the base prepreg PR1. Since it is a backing, it is actually much thinner than the base prepreg, but for the convenience of illustration, there is almost no difference in thickness.

  When a polymer prepreg having the above structure is wound around a metal core or the like to form a tubular body, the cross section of the leading edge is as shown in FIG. 2, and the cross section of the base edge is as shown in FIG. In other words, the so-called single-walled portion has the same width in the circumferential direction and is equally arranged. That is, the direction of bending is minimized. More specifically, the single-sided portions composed of the region portions HAB, HBC, and HCD that remain adjacent to each other above and below each triangular cut portion are arranged at intervals of 90 degrees, and the remaining single-sided portions HA and HD are Since the winding start end side H3 and the winding end side H4 of the prepreg coincide with each other (the winding width for one turn), they are in a state of being attached to each other. In addition to having the same width as the single-walled portion, they are arranged at intervals of 90 degrees. However, in an actual prepreg, it is difficult to make just one round of winding, so some polymerization occurs. The expression “match” or “one time” above also allows such an error.

Referring to FIG. 3, the base edge portion of the tubular body is formed by superposing one layer of the base prepreg PR1 on the outer side of the one-layer backing PR3, and each triangular prepreg piece on the base prepreg. The single-walled portions are arranged at intervals of 90 degrees, and the respective circumferential widths are the same.
In the above, it has been described that the single-walled portions are equally disposed with respect to the leading edge portion and the original edge portion of the tubular body, but as is clear from the explanation of the prepreg structure in FIG. Similarly, each piece of meat is the same width and is evenly arranged.

  In this example, the number of single-sided portions is four in the circumferential direction, but may be any number of two or more. Further, in this example, the tip vertices of the triangle prepreg pieces PR2A, PR2B, etc. are matched with the tip vertices A1, B1, etc. of the triangle cut portion, but the front direction position is the same (position T2). The position in the vertical direction (width direction) may be shifted (the circumferential position in the tubular body may be shifted). Furthermore, the position T2 of the tip vertex A1 and the like of the triangular cut portion is a position that is ½ of the base prepreg length L, but is not limited thereto, and may be, for example, a position that is L / 3 from the leading edge H1. . In this case, since the length of the cut-out triangular prepreg piece is L / 3, if this is overlapped and pasted from the leading edge H1 to the position of the original side direction L / 3 to 2L / 3, the original area is further increased. Between 2L / 3 and L, only the base prepreg is used. For example, the other side of the prepreg is wound around the region (2L / 3 to L) one time or two times, so that the rigidity of the original side can be obtained. Can be the same as or higher than the previous side.

Further, when the position T2 such as the tip vertex A1 of the triangular cut portion is set to a position L / 3 from the leading edge, another length having this length (2L / 3) between the remaining areas L / 3 to L is obtained. A triangular prepreg piece made of prepreg may be polymerized and pasted in the same way (so as to be uniform in the circumferential direction). In this sense, also in the example of FIG. 1, the triangular prepreg pieces PR2A and the like may be triangular prepreg pieces made of other prepregs, and further, triangular cut portions (A1, A2, A2, A2 cut from the leading edge side of the base prepreg). Triangular prepreg pieces having dimensions different from the dimension (size) of the A3 triangle cut portion or the like may be used, and these may be superposed and adhered to the base prepreg so as to be uniform in the circumferential direction. Furthermore, it is needless to say that a triangular prepreg piece cut out from a prepreg having an elastic modulus different from that of the base prepreg can be used. In addition, the base prepreg has a size corresponding to one turn of winding, but for example, the base prepreg may further have a spread area for one turn of winding continuously to the upper position of the upper edge H3. That is, a normal simple winding region and a polymerization prepreg region unique to the present application may be integrally provided. Moreover, you may have separately. Further, although the backing has the reinforcing fiber direction in the up-down direction, it may be oriented in the tip direction. In addition, the superposition bonded triangular prepreg piece is also directed to the antegrade direction of the reinforcing fiber, but may be a prepreg piece oriented in the direction of ± 45 degrees or other inclination angle.
Each of the modifications described in this paragraph and the preceding paragraph can be similarly applied to the other embodiments described below.

  FIG. 4 shows another example of the polymerized prepreg unique to the present application. FIG. 5 is a partial perspective view thereof. Portions that can be easily understood in the description of the above-described embodiment with reference to FIG. 1 and the like will be omitted or simply described. The generally trapezoidal base prepreg (PR1 ') surrounded by the sides H2, H4', H4, H1, H3 connecting the points P1, P2, P3, P4, P5 (, P6) is a through ply for one turn. It is a prepreg. In the region between the leading edge position TI and the intermediate position T2, four triangular cut portions are cut out so as to be even in the tubular body. The feature in this example is that a triangular cut portion connecting points D1 (P3), D2 (P4), and D3, which is one of the cut portions, is located at one lower edge H4 of the upper and lower edges of the base prepreg. It is that you are. Accordingly, in the base prepreg after being cut, the leading edge H1 is a line portion connecting the points P5 and D3, and the line segment connecting the points D3 and D2 is smaller than the portion wound once. However, the widths of the partial lower edge H4 'and the upper edge H3 from the position of the point P3 to the point P2 remain as they are for one turn.

  The triangular cut portions are provided so that the intervals are uniform, and the distance between the points P5 and A3, the distance between the points A2 and B3, and the like are the same. In this example, the cut triangular prepreg pieces are superposed and pasted in a region between T2 and T3 so as to be evenly dispersed when formed into a tubular body. FIG. 6 is a cross section of the leading edge portion, and the single-wall portions HDA, HAB, HBC, and HCD are evenly arranged at intervals of 90 degrees. The difference from FIG. 2 is that the winding start and end positions are different. FIG. 7 is a cross-sectional view of the base edge, which is the same as FIG.

Various modifications of this embodiment are as described above.
FIG. 8 is a production diagram schematically showing a general method for forming a tubular body. A tubular body using not only a polymerized prepreg unique to the present application but also other prepregs will be described. First, in order to prevent tearing of the tubular body, a material obtained by polymerizing a woven fabric prepreg PR8 and a prepreg PR7 in which reinforcing fibers are oriented in the circumferential direction is wound around the tip portion of the core metal 10 and then tubular. A prepreg PR5 having a length corresponding to the length of the body and serving as a main body layer, in which the reinforcing fiber is axially oriented, is wound together with a circumferentially oriented backing prepreg PR6. In order to make this tubular body have a desired flexing tone, it is unique to the present application, and the reinforcing fiber has an axially-oriented prepreg PR1 + a substantially triangular prepreg piece (PR2A, etc.) on the inside, and the reinforcing fiber is on the outside. A direction-oriented backing prepreg PR3 is polymerized and wound. In this way, it is possible to provide a tubular body having a desired change in bending rigidity and a reduced bending directionality.

  In this example, the prepregs PR5 and PR6 constituting the main body layer are disposed inside the prepregs PR1 and PR3. However, the internal / external relationship may be reversed. The prepregs PR1 and PR3 have the same length as the prepregs PR5 and PR6 for the main body layer, but may be relatively short. Moreover, the winding position is also arbitrary.

  The present invention can be used for fishing rod rods, golf club shafts, racket frames such as tennis, bicycle frames, and the like.

FIG. 1 is a plan view of a polymerized prepreg for producing a tubular body according to the present invention. FIG. 2 is a cross-sectional view of a tubular body tip portion by the prepreg of FIG. FIG. 3 is a cross-sectional view of the tubular body base portion of the prepreg of FIG. FIG. 4 is a plan view of a polymerized prepreg of another embodiment for producing a tubular body according to the present invention. FIG. 5 is a partial perspective view of the polymerized prepreg of FIG. FIG. 6 is a cross-sectional view of a tubular body tip portion by the prepreg of FIG. FIG. 7 is a cross-sectional view of the tubular body base portion of the prepreg of FIG. FIG. 8 is a production diagram showing a method for producing another tubular body according to the present invention.

Explanation of symbols

A1, A2, A3; ... Each vertex of the triangular cut portion H1 Base edge of base prepreg H2 Base edge of base prepreg H3 Upper edge of base prepreg H4 Bottom edge of base prepreg HA, HAB, ... Area (single meat)
PR1 Base prepreg PR3 Lined prepreg PR2A, PR2B ... Triangle prepreg piece (one side)
T1 The leading edge position in the leading direction T3 The leading edge position in the leading direction

Claims (2)

It is formed by winding a prepreg, and the original side bending rigidity is the same as that of the front side or a higher fiber-reinforced resin tubular body,
A substantially rectangular or substantially trapezoidal through-ply prepreg, which is a part of the prepreg, extends over a predetermined length range on the front side, and a substantially triangular cut portion having one side located at the position of the leading edge of the through-ply prepreg. When a plurality of portions are provided and wound into a tubular body, each single-walled portion made of the remaining region adjacent to each cut portion in the through-ply prepreg is dispersed at approximately equal intervals in the circumferential direction. In the cross section, the circumferential width is approximately the same,
The tip direction position corresponding to the apex portion that is not located on the one side of the substantially triangular cut portion of the prepreg has the same or different dimension as the cut portion, and the length in the tip direction is substantially the same. Is positioned on one side of the substantially triangular prepreg piece, and is wound by being superposed and bonded to the through-ply prepreg while positioning one side not having the top part on the original side far from the leading edge side. A tubular body, characterized in that each piece of the portion composed of each bonded substantially triangular prepreg piece is dispersed in the circumferential direction at approximately equal intervals, and the circumferential width is substantially the same in the cross section.   The tubular body according to claim 1, wherein the substantially triangular prepreg piece to be bonded has the same size as the cut portion of the substantially triangular shape.

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