JP2001246673A - Tubular body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a design-mode pattern rationally on the outer peripheral surface of a tubular body without grinding the body, regarding the tubular body having a helical pattern formed on the surface, such as a shaft of a club or a fishing rod. SOLUTION: On the occasion of winding wrapping tapes c1 and c2 helically on the outer peripheral surface of a reinforcing fiber prepreg 1 wound on a mandrel b, they are wound with an intention for a design so that they form a prescribed helical pattern, and the prepreg 1 is heated to be hardened in this state. Thereby arbitrary helical patterns c1' and c2' are formed on the outer peripheral surface of the tubular body (a).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced plastic tubular member having a spiral pattern formed on a surface thereof, and more particularly to a golf club shaft, a fishing rod, and the like.
A tubular body used for ski poles and the like.

[0002]

2. Description of the Related Art Conventionally, tubular bodies used for golf shafts, fishing rods, ski stocks, and the like are made of fiber-reinforced plastics using fibers such as carbon fibers in order to achieve weight reduction, high strength, and high rigidity. And molding. When manufacturing a tubular body for the above-mentioned applications, for example, a thermoplastic resin such as epoxy is applied to a straight carbon sheet in which carbon fibers are aligned in one direction or a carbon sheet in which carbon fibers are woven with a bias. It is molded using a prepreg impregnated.

As shown in FIG. 8, a prepreg 101 using the above-mentioned straight carbon sheet or bias carbon sheet is a mandrel 1 which is a tapered mandrel.
02 and wound around it. Then, the wrapping tape 103 is spirally wound around the outer peripheral surface of the prepreg 101 layer wound around the mandrel 102 while applying an appropriate tension, and the outer peripheral surface of the prepreg 101 is entirely covered and pressed, thereby obtaining the same result. The prepreg 101 layer is brought into close contact with the outer peripheral surface of the mandrel 102 (FIG. 9).

The prepreg 101 wound around the outer periphery of the mandrel 102 as described above is formed into a tubular body 100 by heating in a firing furnace to cure the resin impregnated in the carbon fibers. In addition, the tubular body 1 in which the resin is cured
00 performs polishing after decentering from the mandrel 102. The tubular member 100 is polished to remove the winding traces of the wrapping tape 103 formed on the outer peripheral surface, and to partially remove the excess strength carbon fiber, thereby obtaining bending rigidity and torsional rigidity. The product was made by adjusting the conditions as evenly as possible. However,
The polishing process, which is mainly performed manually, is such that the bending condition of each tubular body is slightly different depending on the skill of the operator, and this also causes a strong variation between lots. There was also a possibility that defective products might be generated due to the above factors.

[0005]

However, with the recent improvement in the technology for producing carbon raw materials, materials of stable quality have been provided, and as a result, as described above, portions having excessive strength The required bending rigidity and torsional rigidity can be made uniform without polishing the carbon fiber.

Therefore, some fishing rods and the like are manufactured as products without performing a polishing process. However, the winding traces of the wrapping tape wound at the time of manufacturing remain on the outer peripheral surfaces of these rods at random, and it is hard to say that the appearance is beautiful.

An object of the present invention, as described above, is to provide a tubular body in which a prepreg of a reinforcing fiber is wound around an outer peripheral surface of a mandrel, and a wrapping tape is entirely wound around the outer peripheral surface to be heated and cured. An object of the present invention is to provide a product which can omit a grinding process and can form a design pattern rationally on the outer peripheral surface of the tubular body.

[0008]

In the tubular body of the present invention, a sheet-like reinforcing fiber prepreg is wound around an outer peripheral surface of a mandrel serving as a mandrel, and a wrapping tape is entirely wound around the outer peripheral surface of the mandrel. When a wrapping tape is wound around the outer peripheral surface of the reinforcing fiber prepreg wound on the mandrel in a tubular body in which the prepreg is brought into close contact with the outer peripheral surface of the mandrel and the reinforcing fiber prepreg is heated and cured in this state, By winding the spiral pattern to draw a spiral pattern, and heating the reinforcing fiber prepreg in this state, a spiral pattern consisting of a winding trace of a wrapping tape was formed on the outer peripheral surface of the tubular body after resin curing. Things.

According to the above-mentioned means, the reinforcing fiber prepreg wound around the outer periphery of the mandrel is pressed against the outer peripheral surface of the mandrel by winding a wrapping tape. The wrapping tape is spirally wound around the outer periphery of a reinforcing fiber prepreg wound around a mandrel. When winding the wrapping tape, the wrapping tape is wound so as to draw a predetermined spiral shape, for example, a spiral pattern intended for a design. Therefore, after heating the reinforcing fiber prepreg and curing the resin, when the wrapping tape wound as described above is peeled off, the winding trace of the wrapping tape remains on the outer peripheral surface of the tubular body. Is formed as a design spiral pattern.

The tubular body according to the second aspect is obtained by winding a plurality of layers of the wrapping tape of the tubular body according to the first aspect, so that the spiral pitch and the winding direction of each wrapping tape can be varied. They can be combined and various spiral patterns can be drawn on the outer peripheral surface of the tubular body.

According to a third aspect of the present invention, in the tubular body according to the first or second aspect, a wrapping tape is spirally wound around an outer peripheral surface of the reinforcing fiber prepreg wound around the mandrel. An exposed portion where the surface of the reinforcing fiber prepreg is exposed is formed between the pitches, and a second wrapping tape is spirally wound around the outer periphery of the reinforcing fiber prepreg in a direction opposite to that of the first wrapping tape. The exposed portion is covered with a tape.

In this case, the first wrapping tape is spirally wound around the outer peripheral surface of the reinforcing fiber prepreg wound around the mandrel. A spiral exposed portion is formed between the spirally wound wrapping tapes, and the prepreg is exposed from the exposed portion. And
The outer peripheral surface of the prepreg is entirely covered while a second wrapping tape is spirally wound around this surface. At this time, the second wrapping tape is wound in a direction opposite to the spiral of the first wrapping tape. Therefore, after heating the reinforcing fiber prepreg to cure the resin, the two wrapping tapes are peeled off, and the helical pattern of the first wrapping tape layer and the helical exposed portion peeping between the two patterns are formed. Entangled like a heavy screw, it is formed in a twill shape. And the edge part of the spiral pattern by the second tape is formed in the exposed part as a stripe pattern of an appropriate pitch, whereby a braided pattern mainly composed of a spiral is formed on the outer peripheral surface of the tubular body. You.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The tubular body a shown in FIG. 1 is used as a shaft of a golf club, and is formed in a hollow shape using carbon fibers. As described later, the tubular body a is formed by winding a carbon prepreg 1 around the outer peripheral surface of a mandrel b serving as a mandrel, further winding a wrapping tape c with good releasability around the outer peripheral surface, and heating and curing. is there. A beautiful spiral design is formed on the outer peripheral surface of the tubular body a using the winding trace of the wrapping tape c.

As shown in FIGS. 2 and 3, the tubular body a is attached to the outer periphery of the mandrel b serving as a mandrel.
The prepreg 1 cut into a substantially trapezoidal shape is wound around the taper. The prepreg 1 is formed by laminating a prepreg formed by impregnating a synthetic resin such as epoxy into a straight carbon sheet and a prepreg formed by using a biased carbon sheet. The direction and thickness of the carbon sheet are arbitrarily changed. May be.

As described above, the mandrel b around which the prepreg 1 is wound is rotatably supported by gripping the base end thereof with the chuck d. A tape roller e is arranged on one side of the mandrel b mounted on the chuck d, and moves in parallel along the mandrel b supported as described above. The rotation of the mandrel b and the moving speed of the tape roller e are configured to operate at an arbitrary ratio, and by changing the ratio, the helical pitch of the wrapping tape c1 wound around the outer periphery of the mandrel b is reduced. Is set (FIG. 4).

In the case of the tubular body a of this embodiment, the pitch of the wrapping tape c1 is set large. In particular,
When the wrapping tape c1 is spirally wound around the outer periphery of the prepreg 1 wound around the mandrel b, a spiral exposed portion 1a is formed between the spirals of the wrapping tape c1 so that the outer peripheral surface of the prepreg 1 can be seen. It is set so that it can be done. The width of the exposed portion 1a and the wrapping tape c
The width of 1 substantially matches. After the wrapping tape c1 is wound over substantially the entire length of the mandrel b as described above, the wrapping tape c2 is wound thereon.

The second wrapping tape c2 is wound in a direction opposite to the winding direction of the first wrapping tape c1. The helical pitch of the second wrapping tape c2 is set small, and the wrapping tapes c2 are wound so that adjacent wrapping tapes c2 partially overlap each other (FIG. 5). That is, the outer peripheral surface of the mandrel b around which the prepreg 1 is wound is entirely covered with the second wrapping tape c2, and at the same time, the spiral exposed portion 1a formed between the wrapping tapes c1 is covered with the wrapping tape c2. To be covered by The second wrapping tape c2 wound as described above crosses the exposed portion 1a formed between the first wrapping tapes c1 like a stripe pattern. In the case of this embodiment,
The first and second two wrapping tapes are used to cover the entire surface of the prepreg, but if the pressing force on the prepreg is insufficient, a third wrapping tape may be wound.

As described above, the wrapping tapes c1 and c2
Is heated in a firing furnace while being mounted on the mandrel b (for example, at about 130 ° C. to 140 ° C. for about 2 hours) to cure the resin of the prepreg 1 and integrate the carbon sheet layers. I do. Further, when the resin of the prepreg 1 is cured, the two wrapping tapes c1, c wound on the outer peripheral surface.
2 is a mandrel b by compressing the prepreg 1 from the surface side.
To the outer peripheral surface of At this time, both wrapping tapes c1 and c2 are prepreg 1 softened in the early stage of heating.
The layer is pressed against the surface of the layer to form a wrapping mark (winding mark). Tubular body a formed by curing the resin as described above
When the wrapping tapes c1 and c2 wound on the outer peripheral surface are peeled off, winding marks of both wrapping tapes c1 and c2 are formed on the outer peripheral surface (FIG. 1).

The winding trace formed on the outer peripheral surface of the tubular body a is
The spiral pattern c1 'of the first wrapping tape c1 and the spiral exposed portion mark 1a' to be viewed between the pattern c1 'are formed in a manner to be entangled with each other. The second wrapping tape c2 is located within the range of the above-mentioned spiral exposed portion mark 1a '.
Of the spiral pattern is exposed as a stripe pattern at substantially equal intervals, and a beautiful design pattern mainly composed of a spiral is formed on the outer peripheral surface of the tubular body a.

According to the gist of the present invention, the helical pitch, the winding direction, the winding order, the width of the spiral exposed portion, the thickness and width of the tape itself, and the use of the wrapping tape wound around the outer periphery of the prepreg are used. The number and the like may be freely changed, and the tubular body a
Various spiral patterns can be formed on the outer peripheral surfaces of 2, 3 (FIGS. 6 and 7). In addition, by forming irregularities such as characters and patterns on the wrapping tape that forms the spiral pattern as described above, the traces of the spiral pattern can be captured in the range of the spiral pattern on the outer periphery of the tubular body. The tubular body of the present invention can be used for ski poles, baseball bats, badminton shafts, poles, etc., in addition to golf club shafts and fishing rods.

[0021]

As described above, when the wrapping tape is spirally wound on the outer peripheral surface of the reinforcing fiber prepreg wound on the mandrel, the tubular body of the present invention is drawn in a predetermined spiral pattern. By turning and heating and curing the reinforcing fiber prepreg in this state, an arbitrary spiral pattern is formed on the outer peripheral surface of the tubular body. According to the above-described means, the step of grinding the outer peripheral surface of the tubular material, which is performed after the prepreg of the reinforcing fiber is heated and cured, as in the case of the conventional tubular body, can be omitted.
Manufacturing costs can be significantly reduced. In addition, it is possible to prevent the variation in strength due to manual grinding and the occurrence of defective products caused by humans, and to use the winding trace of the wrapping tape remaining on the outer peripheral surface of the tubular material to design the outer peripheral surface of the tubular body. Since a typical spiral pattern can be formed, a beautiful appearance as a product can be maintained.

Since the tubular body according to the second aspect is obtained by winding the above-mentioned tubular body wrapping tape over a plurality of layers, the spiral pitch, the width of the exposed portion, and the winding direction for each wrapping tape are determined. Arbitrary combination is possible, and various spiral patterns can be drawn on the outer peripheral surface of the tubular body.

According to a third aspect of the present invention, in the tubular body, the first wrapping tape is spirally wound around the outer peripheral surface of the reinforcing fiber prepreg wound around the mandrel, and the surface of the reinforcing fiber prepreg is spirally wound between the wrapping tapes. At the same time, the second wrapping tape is spirally wound in the opposite direction to the first wrapping tape to cover the spirally exposed portion. Therefore, after heating the reinforcing fiber prepreg and curing the resin, when the two wrapping tapes are peeled off, the spiral pattern of the first wrapping tape is formed in a spiral shape, and the spiral pattern peeking between the spiral patterns is formed. The edge portion of the spiral pattern formed by the second tape is exposed as a striped pattern on the exposed portion, and a beautiful braided pattern mainly composed of a spiral can be formed on the outer peripheral surface of the tubular body.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a tubular body embodying the present invention.

FIG. 2 is a perspective view showing a mandrel and a prepreg wound around the mandrel.

FIG. 3 is a perspective view showing a state in which a prepreg is wound around the outer periphery of a mandrel.

FIG. 4 is a perspective view showing a state in which a wrapping tape is spirally wound around an outer peripheral surface of a prepreg wound around a mandrel.

FIG. 5 is a perspective view showing a state in which a second wrapping tape is wound on the prepreg by reverse rotation.

FIG. 6 is a perspective view showing a tubular body having a spiral design pattern on the outer peripheral surface.

FIG. 7 is a perspective view showing a tubular body having a spiral design pattern on the outer peripheral surface.

FIG. 8 is a perspective view showing a state in which a wrapping tape is wound around an outer periphery of a prepreg wound around an outer periphery of a mandrel by a conventional method.

FIG. 9 is a partially cutaway perspective view showing a state in which a wrapping tape is entirely wound around the outer periphery of the prepreg by a conventional method.

[Explanation of symbols]

 a, a2, a3: tubular body b: mandrel c1, c2: wrapping tape 1: prepreg 1c ': trace of exposed part c1': spiral pattern c2 ': edge part Trace

Claims (3)

[Claims] 1. A sheet-like reinforcing fiber prepreg is wound around an outer peripheral surface of a mandrel which becomes a mandrel, and a wrapping tape is completely wound around the outer peripheral surface so that the reinforcing fiber prepreg is brought into close contact with the outer peripheral surface of the mandrel. In a tubular body that heats and hardens the reinforcing fiber prepreg in a state, when winding a wrapping tape around the outer peripheral surface of the reinforcing fiber prepreg wound around the mandrel, the wrapping tape is wound so as to draw a predetermined spiral pattern. A tubular body configured to form a spiral pattern formed by winding traces of a wrapping tape on the outer peripheral surface of the tubular body after resin curing by heating the reinforcing fiber prepreg in a state. 2. The tubular body according to claim 1, wherein said wrapping tape is formed by winding a plurality of layers of said wrapping tape. 3. A wrapping tape is spirally wound around an outer peripheral surface of a reinforcing fiber prepreg wound around a mandrel,
An exposed portion where the surface of the reinforcing fiber prepreg is exposed is formed between the pitches of the wrapping tape, and a second wrapping tape is spirally wound around the outer periphery of the reinforced prepreg in a reverse direction to the first wrapping tape. 3. The tubular body according to claim 1, wherein the exposed portion is covered with a two-layer wrapping tape.