JPH11290498A - Ski pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ski pole of excellent safety without easily being parted when broken, or without being broken to split or scatter having excellent characteristics of carbon fiber-reinforced plastic such as light weight and high strength. SOLUTION: In a tubular body comprising carbon fibers and high elongation organic fibers drawn in the same direction, the carbon fibers and the high elongation organic fibers are disposed in an axial direction of the tubular body to compose a hybrid part 3, and for the hybrid part 3, (1) A part 2 comprising the high elongation organic fibers is disposed to be dispersed in a part comprising carbon fibers in a cross sectional surface of the tubular body, and (2) In a range of 200-700 mm from a tip, quantity of continuous fibers of the high elongation organic fibers disposed in the axial direction of the tubular body is set at 60 vol.% or over in the high elongation organic fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ski pole, and more particularly, to a ski pole that is lightweight and high-strength, but does not easily break at the time of destruction and does not break dangerously.

[0002]

2. Description of the Related Art Carbon fiber reinforced plastic members having excellent properties such as light weight, high strength and high elasticity are widely used as sports equipment and industrial structural materials.

[0003] By using carbon fiber reinforced plastic, the weight of the member can be reduced as compared with conventional materials. However, carbon fiber reinforced plastics may take dangerous destructive forms different from conventional materials such as metals, and depending on the application, the application of carbon fiber reinforced plastics is limited, and even if applied, its excellent properties In some cases, the characteristics cannot be fully utilized.

[0004] Above all, ski poles are applications in which the weight of the ski pole is greatly reduced by taking advantage of the properties of carbon fiber reinforced plastic, but it is necessary that the broken surface is not dangerous to the human body when broken during use. It is. Even if a conventional aluminum ski pole breaks, it will bend only in many cases without breaking, and the broken surface will not appear outside, but the ski pole made of carbon fiber reinforced plastic, which has been increasing in recent years, may break when broken. In such cases, measures such as winding glass fiber woven fabric or Kevlar fiber are taken to ensure that the fracture surface does not take a dangerous form in order to ensure safety. This causes problems such as an increase in cost and an increase in cost.

In addition, lightweight bicycle frames, wheelchairs, golf club shafts, etc. are desired.
In addition, there are many uses for members that are likely to come into contact with the human body, in which it is desired not to break and break in the event of breakage.

[0006] In order to solve such a problem, in ski poles, a combination of carbon fiber reinforced plastic with a woven fabric made of glass fiber, metal fiber, or the like has been used. However, in order to prevent the breakage by these methods, it is necessary to use a considerable amount of glass fiber or metal fiber, and there is a problem that the weight of the ski pole increases or the rigidity decreases, making it difficult to use. In addition, high-performance metal fibers and the like are generally expensive, have poor moldability, and often cause an increase in the cost of ski poles.

[0007] Also, in a bicycle frame and a handlebar, Japanese Unexamined Patent Application Publication Nos. 5-69874 and 5-1 have been disclosed.
As described in Japanese Patent No. 47569, a method is known in which a metal fiber and a heterogeneous fiber other than the metal fiber are used as reinforcing fibers to prevent splitting and destruction. However, also in this case, problems such as weight increase and cost increase often occur.

[0008]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and has the excellent properties of carbon fiber reinforced plastics such as light weight and high strength, while easily breaking when broken, The aim is to provide ski poles that do not break such as splashes at a relatively low price.

[0009]

The present invention employs the following means in order to solve the above problems. That is, the ski pole of the present invention is a tubular body made of carbon fibers and high elongation organic fibers aligned in the same direction, and the carbon fibers and the high elongation organic fibers are formed by a shaft of the tubular body. (1) On the cross section of the tubular body, the portion having the high elongation organic fiber is distributed and arranged on the portion having the carbon fiber. (2) Within the range of 200 to 700 mm from the tip, the continuous fiber amount of the high elongation organic fibers arranged in the axial direction of the tubular body is caused to exist in the high elongation organic fibers by 60% by volume or more. The feature is that it is.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The present invention has been made to solve the above problems, namely,
Despite its light weight and high strength, we intensively studied ski poles that do not break easily when broken or break like splashing or scattering.The ski poles are made of a tubular body made of carbon fiber and high elongation organic fiber. (1) On the cross section of the tubular body, the portion having the high elongation organic fiber is dispersed and arranged in the portion having the carbon fiber. ) A hybrid structure in which, within a range of 200 to 700 mm from the tip, a continuous fiber amount of the high elongation organic fibers arranged in the tubular body axial direction is present in the high elongation organic fibers at 60% by volume or more. As a result, it was determined that such a problem could be solved at once.

In the hybrid part, the high elongation organic fiber is 100% by volume of the reinforcing fiber composed of the carbon fiber and the high elongation organic fiber and 100% by volume of the high elongation organic fiber. Is preferably in the range of 5 to 50% by volume, preferably 10 to 30% by volume, more preferably 15 to 30% by volume.
-30% by volume, more preferably 17-25% by volume. If this ratio exceeds 50% by volume, the strength and rigidity of the member tend to decrease due to the reduction of carbon fibers that bear most of the load. If the ratio is less than 5% by volume, the ski poles are liable to break when broken. Tend.

The carbon fibers referred to in the present invention include not only carbon fibers but also graphite fibers, and any of polyacrylonitrile (PAN) -based and pitch-based carbon fibers can be used. Among them, a polyacrylonitrile having high tensile strength is preferably used. Any form such as a twisted yarn, untwisted yarn, and non-twisted yarn can be used. Among these forms, a non-twisted yarn or an untwisted yarn is preferably used in view of the balance between the moldability and strength of the member.

The high elongation organic fiber referred to in the present invention is
It means a fiber having a higher tensile elongation at break among organic fibers, and preferably has a higher elongation at break than a glass fiber which is a representative of inorganic fibers. Specifically, it is a polyamide fiber, a polyester fiber, a polyvinyl alcohol fiber, a polyacrylonitrile fiber, a polyurethane fiber, a polyethylene fiber, and the like. From the viewpoint, a nylon fiber which is one of the polyamide fibers is preferably used.

[0014] As such high elongation organic fibers, those having a tensile elongation at break of preferably more than 10%, more preferably more than 15% are used. That is, due to the presence of the high elongation organic fiber having such tensile elongation at break, when the ski pole member (hereinafter, simply referred to as a member) is broken, first the carbon fiber as the main load-bearing material breaks, At that time, the high elongation organic fibers are not broken at the same time, and the subsequent energy absorption is large, so that there is an effect that separation of the member and exposure of a dangerous fracture surface can be avoided.

The carbon fibers and the high elongation organic fibers of the hybrid portion need to be aligned in the same direction, but the alignment directions do not always have to be completely matched due to manufacturing restrictions. . However, the difference is preferably within 3 degrees.

The hybrid portion may include a third fiber in addition to the carbon fiber and the high elongation organic fiber, as long as the effects of the present invention are not impaired. The volume content Vf of all the fibers in the hybrid portion is preferably in the range of 40% by volume to 80% by volume, more preferably in order to balance the mechanical properties of the member with the stability of production. It should be in the range of 50% to 70% by volume.

As the matrix resin of the hybrid portion, various thermosetting resins and thermoplastic resins such as an epoxy resin, a phenol resin, a polyester resin, and a vinyl ester resin can be used. Among them, an epoxy resin which is easy to mold and has excellent physical properties is preferable. Further, in order to add various functions and performances, the matrix resin may contain particles, fibrous substances, and the like as long as the effects of the present invention are not impaired.

It is preferable that the alignment direction of the carbon fiber and the high elongation organic fiber in the hybrid portion is parallel to the main axis of the member. The member main axis corresponds to the axis at which the member is most likely to break. In the case of a plate-like, rod-like, or tubular member, it corresponds to the longitudinal direction of the member. Since the fibers are aligned on the main shaft of the member, it is possible to more effectively prevent the breakage of the member and the exposure of the fracture surface due to the breakage of the member.

In the hybrid portion, the arrangement of the carbon fibers and the high elongation organic fibers is optional. However, since the breakage of the carbon fibers hardly causes the entire high elongation organic fibers to break, the fiber is pulled. A cross section perpendicular to the alignment direction, that is, a portion having a high elongation organic fiber on the tubular body cross section,
That is, the portion where the high elongation organic fiber is surrounded by the matrix resin is complexed, the portion having the carbon fiber, that is, the portion where the carbon fiber is surrounded by the matrix resin is complexed,
It is preferable that the so-called sea-island structure is arranged while being dispersed while having a certain set unit. If it is a tubular member, it has a cross section as shown in FIG. 1, for example. Thereby, the breakage of the carbon fiber can be less likely to cause the entire breakage of the high elongation organic fiber, and the uniformity of the physical properties of the hybrid portion can be maintained. At the same time, even when the portion having the carbon fiber and the portion having the high elongation organic fiber are separated, the influence on the properties of the member can be suppressed. In the case of such an arrangement, the distance between the portions having the high elongation organic fibers is preferably not more than 5 mm.

Although the shape of the ski pole of the present invention is optional depending on the application and configuration, in order to take advantage of the characteristics of the carbon fiber reinforced plastic and to increase the effect of the present invention, a general ski pole shape is used. Certain tubes are preferred. The tubular shape is a hollow shape having a substantially circular cross section or a shape having a different material such as a foam material therein, and the main shaft may be bent or tapered as necessary.

On the other hand, a structure having aligned carbon fiber bundles and high elongation organic fibers covering the same also prevents breakage and scattering of fragments when the ski pole is broken, and is effective in improving safety. In this configuration, the high elongation organic fibers are not aligned in the same direction as the carbon fibers, but are coated in the form of, for example, spirally wrapping the unit around which the carbon fibers are bundled, that is, the carbon fiber bundle. I do. In this configuration, in a cross section perpendicular to the direction in which the carbon fibers are aligned,
It is preferable that a portion exceeding 40% of each circumference of the carbon fiber bundle is coated with the high elongation organic fiber.

As described above, in the ski pole of the present invention, the portion having the high elongation organic fiber is dispersed and arranged in the portion having the carbon fiber on the cross section of the tubular body. Even if it is broken inside, it is less likely to break or expose a fractured surface, and is less likely to injure the human body. Therefore, the safety pole is much higher in safety than a conventional carbon fiber reinforced plastic ski pole. In a buckling point test of a ski pole defined in JIS S7026, splitting failure is unlikely to occur due to buckling force. Breaking by the buckling point test often occurs within a range of 400 to 600 mm from the tip of the ski pole. Therefore, the fact that the high elongation organic fibers are not cut in this portion is convenient for preventing the division. However, as shown in FIG. 3, ski poles are generally tapered. For example, when a prepreg is formed using a prepreg, the prepreg is often cut into a trapezoidal shape. What cut | disconnects the fiber in the axial direction, ie, a prepreg longitudinal direction, is used. This is the same for the high elongation organic fiber. To increase the probability of not breaking and breaking in the buckling point test of the ski pole, the continuous elongation in the high elongation organic fiber should be within 200 to 700 mm from the tip of the ski pole. When the area of the high elongation organic fiber existing in the cross section of the tubular body at the position of 700 mm is defined as 100%, the amount of the existing fiber is present in the cross section of the tubular body at the position of 200 mm. It is necessary to make the area of the high elongation organic fiber to be 60% or more. The amount of the fiber is preferably 70% by volume, more preferably 75% by volume or more.
In a molding method using a prepreg, for example, a method of cutting into a trapezoidal shape or a method of cutting into a rectangle may be applied.

The weight, strength, rigidity, etc., which are important characteristics of a ski pole, are almost the same as those of conventional ski poles made of carbon fiber reinforced plastic, and there is almost no sense of discomfort during use.

The ski pole of the present invention may have a portion made of various fiber-reinforced plastics or metal, if necessary, in addition to the hybrid portion. For example, it is a tubular member having a cross section as shown in FIG. In particular, by providing the fiber reinforced plastic layer outside the hybrid portion, a large resistance value is exhibited against an external force due to impact, and the fracture surface after fracture is easily flattened. The reinforcing fibers used in such a fiber-reinforced plastic layer are preferably glass fibers from the viewpoint of enhancing impact resistance, but also other carbon fibers, silicon carbide fibers, aramid fibers, boron fibers, high-strength polyethylene fibers, and the like. Mixed yarn may be used.

Further, such a fiber-reinforced plastic layer is
Furthermore, if it is arranged inside the hybrid part, the amount of displacement in a bending test or a buckling point test increases, so it is preferable to arrange it both on the outside and inside.

In such a fiber-reinforced plastic layer, the reinforcing fibers can be arranged arbitrarily in the axial direction of the ski pole. Above all, the reinforcing fibers are preferably in the range of ± 30 to ± 30
It is desirable to arrange at 60 degrees. In addition, from the viewpoint of suppressing the propagation of cracks, it is preferable to use a reinforcing fiber in the form of cloth or scrim cloth for the fiber-reinforced plastic layer.

By arranging a fiber-reinforced plastic layer containing carbon fibers on the outside and / or inside of the hybrid portion, when the reinforcing fibers are arranged in the axial direction of the ski pole, they can be bent or compressed. When arranged in the circumferential direction, the repulsive force against the force of crushing the ski poles in the radial direction increases, and the orientation angle of the fiber with respect to the axial direction is 30 to 60 degrees. In some cases, there is an advantage that the torsion strength is excellent and the deformation amount is large. Here, the orientation angle is, for example, as shown in FIG. 3, when a trapezoidal prepreg is wound around a stainless steel core, a prepreg in which the fiber direction is inclined by an angle θ with respect to the central axis is prepared in advance. Refers to an angle θ in a case where a laminated body is obtained by winding.

In the case where the orientation angle is 30 to 60 degrees, the carbon fibers are alternately laminated and arranged so that the orientation angle is in both the forward and reverse directions with respect to the axial direction (-θ with respect to + θ). It is desirable because symmetry with respect to the axial direction of the pole is maintained and the balance is improved. Here, the forward and reverse directions are a right-handed twist and a left-handed twist with respect to the axial direction, and the orientation angle is ± 30 to ± 60 degrees.

This carbon fiber reinforced plastic layer has an orientation angle of 3 when disposed inside the hybrid portion.
It is preferable that the angle is 0 to 60 degrees because the deformation amount increases.
Further, when the fiber direction is arranged so as to be at least one of the axial direction and the circumferential direction, it is desirable that the carbon fiber reinforced plastic layer is arranged outside the hybrid portion in view of the destruction of the ski pole.

A ski pole is generally tapered, and becomes thinner toward the tip. Since the tip has a smaller strength against breakage, a reinforcing layer is often provided in the narrow portion of the tip in addition to the basic layer disposed on the entire ski pole. This reinforcing layer is 0 mm to 600 mm from the tip.
Often mm, the innermost layer, the outermost layer, or the intermediate layer is arranged in many cases. At least one selected from a glass fiber reinforced plastic layer and a carbon fiber reinforced plastic layer is disposed in the reinforcing layer. In particular, it is desirable that the reinforcing layer has a form (structure) in which the amount is gradually reduced as the diameter becomes larger than the tip. By using a hybrid portion for this reinforcing layer, the effect of further preventing breakage at the time of breakage is enhanced. In this case, such a reinforcing layer is preferably disposed between 0 mm and 800 mm from the tip, and in order to prevent the ski pole buckling point test from being separated, the reinforcing layer should be within a range of 0 mm to (500 mm to 800 mm) from the tip. Is desirable. Also, when using multiple reinforcement layers,
The positions where each reinforcement layer runs out are different positions,
Preferably, a position at an interval of about 50 mm can reduce a decrease in strength or a displacement amount due to stress concentration or a sudden change in rigidity. Furthermore, the same effect can be expected by arranging such reinforcing layers at different positions in the thickness direction of the tubular body.

The ski pole of the present invention is formed by using a hybrid prepreg obtained by impregnating a resin into carbon fibers and high elongation organic fibers aligned in the same direction, so that the ski pole is almost the same as a conventional carbon fiber reinforced plastic member. It can be manufactured by the same process. Therefore, the manufacturing cost is almost the same as the conventional one.

The hybrid prepreg is prepared by arranging carbon fibers and high elongation organic fibers in the same direction to form a sheet, impregnating the sheet with a resin before curing, or applying a high elongation organic fiber to the surface of a known carbon fiber prepreg. Can be obtained by, for example, affixing At this time, by appropriately arranging the carbon fibers and the high elongation organic fibers, the balance between the part having the carbon fibers and the part having the high elongation organic fibers in the cross section of the formed member is appropriately adjusted. It can be.

[0033]

The present invention will be described in more detail with reference to the following examples. Example 1 PAN-based carbon fiber bundle (number of filaments 12,000, basis weight 0.804 g / m, tensile elongation at break 2.1%, tensile strength 4
900MPa, tensile modulus 230GPa) and nylon 6
6 fiber bundles (filament number 306, basis weight 0.210 g /
m, tensile elongation at break of 19.5%, and tensile strength of 10.5 g / denier) in the same direction and spread in a sheet shape. At this time, the interval between the nylon 66 fiber bundles was 10 mm. A hybrid prepreg A impregnated with a B-stage epoxy resin (prepreg weight 261 g / m ² , fiber content 70% by weight) was prepared. Hybrid prepreg A
In the above, the volume ratio of the nylon 66 fiber bundle with respect to 100% by volume of the reinforcing fiber composed of the carbon fiber and the nylon 66 fiber bundle was 18% by volume.

PAN-based carbon fiber bundle (12 filaments)
000, basis weight 0.804 g / m, tensile elongation at break 2.1
%, Tensile strength 4900MPa, tensile modulus 230GP
The carbon fiber prepreg B (prepreg basis weight 167 g / m ² , fiber content 67% by weight) was prepared by impregnating B-stage epoxy resin into a sheet-like product prepared by amplifying a).

E-glass fiber bundle (20 filaments)
0, basis weight 22.5 g / 1000 m, tensile elongation at break 4%,
Tensile strength 2500 MPa, tensile elasticity 75 GPa) with plain weave cloth (GF driving number; warp 39 / in.,
Glass cloth prepreg C (prepreg weight: 133 g / m ² , fiber content: 52, weft 39 / in.), Spread in sheet form and impregnated with B-stage epoxy resin
% By weight).

The outer diameter of the small diameter side is 6 mm, the outer diameter of the large diameter side is 13 mm,
First, as a reinforcing layer, a glass scrim cloth prepreg C and a carbon fiber prepreg B were placed in a predetermined range as shown in FIG. Wound in shape,
Thereafter, glass scrim cloth prepreg C is wound so that the warp direction is perpendicular to the core metal main axis, then hybrid prepreg A is wound so that the fiber direction is parallel to the core metal main axis, and then carbon fiber prepreg B is wound. Wrapping is performed so that the fiber direction is parallel to the mandrel main shaft, and then the glass scrim cloth prepreg C is wrapped so that the warp direction is perpendicular to the mandrel main shaft. Winding, curing in an electric furnace, outer diameter polishing, and cutting at both ends were performed to produce a ski pole shaft having a length of 1120 mm.

The distance of 200 mm from the tip of this shaft is 70 mm.
When the end face of 0 mm was polished and observed with an optical microscope,
The hybrid part of the shaft, in which the fiber direction is parallel to the main axis, has nylon 66 in the carbon fiber-containing part.
The portion having the fiber bundle had a dispersed sea-island structure.
The thickness of the shaft excluding the reinforcing portion was 1.5 mm. The amount of nylon 66 fiber at 200 mm is 70
For 0 mm, the volume was reduced by 25% by volume. That is, the continuous fiber amount of the high elongation organic fibers arranged in the axial direction of the tubular body within the range of 200 to 700 mm from the tip is 75% by volume.
Met.

As a result of performing a buckling point test based on JIS S7026 for this shaft, the maximum load was 580 N. The shaft did not break when destroyed. Example 2 A ski pole for ski poles was prepared in the same manner as in Example 1 except that the same prepreg as used in Example 1 was used, and the hybrid prepreg A was used instead of the carbon fiber prepreg B wound around the outside of the hybrid prepreg A. A shaft was made.

From the tip of this shaft, 200 mm and 70 mm
When the end face of 0 mm was polished and observed with an optical microscope,
The hybrid part of the shaft, in which the fiber direction is parallel to the main axis, has nylon 66 in the carbon fiber-containing part.
The portion having the fiber bundle had a dispersed sea-island structure.
The thickness of the shaft excluding the reinforcing portion was 1.5 mm. The amount of nylon 66 fiber at 200 mm is 70
It was reduced by 24% by volume with respect to 0 mm. That is, the continuous fiber amount of the high elongation organic fibers disposed in the axial direction of the tubular body within the range of 200 to 700 mm from the tip is 76% by volume.
Met.

As a result of performing a buckling point test on this shaft based on JIS S7026, the maximum load was 610 N. The shaft did not break when destroyed. Example 3 The same PAN-based carbon fiber bundle and nylon 66 fiber bundle as used in Example 1 were aligned in the same direction and spread in a sheet shape. At this time, the interval between the nylon 66 fiber bundles was 6 mm. Hybrid prepreg D impregnated with B-stage epoxy resin (prepreg weight 242 g / m ² ,
The fiber content was 69% by weight. The volume ratio of the nylon 66 fiber bundle with respect to 100% by volume of the reinforcing fiber composed of the carbon fiber of prepreg D and the nylon 66 fiber bundle is 29% by volume.
It became.

A shaft for a ski pole was manufactured in the same manner as in Example 1 except that hybrid prepreg D was used instead of hybrid prepreg A.

The distance of 200 mm and 70 mm from the tip of this shaft
When the end face of 0 mm was polished and observed with an optical microscope,
The hybrid part of the shaft, in which the fiber direction is parallel to the main axis, has nylon 66 in the carbon fiber-containing part.
The portion having the fiber bundle had a dispersed sea-island structure.
In addition, the thickness of the shaft except for the reinforcing portion was 1.4 mm. The amount of nylon 66 fiber at 200 mm is 70
It was reduced by 24% by volume with respect to 0 mm. That is, the continuous fiber amount of the high elongation organic fibers disposed in the axial direction of the tubular body within the range of 200 to 700 mm from the tip is 76% by volume.
Met.

As a result of performing a buckling point test based on JIS S7026 for this shaft, the maximum load was 520 N. The shaft did not break when destroyed. Example 4 A ski pole shaft was produced in the same manner as in Example 2 except that the same prepreg used in Example 1 was used and hybrid prepreg A was wound in a predetermined shape as shown in FIG.

200 mm from the tip of this shaft and 70 mm
When the end face of 0 mm was polished and observed with an optical microscope,
The hybrid part of the shaft, in which the fiber direction is parallel to the main axis, has nylon 66 in the carbon fiber-containing part.
The portion having the fiber bundle had a dispersed sea-island structure.
The thickness of the shaft excluding the reinforcing portion was 1.5 mm. The amount of nylon 66 fiber at 200 mm is 70
It was reduced by 12% by volume with respect to 0 mm. That is, the continuous fiber amount of the high elongation organic fibers arranged in the axial direction of the tubular body within the range of 200 to 700 mm from the tip is 88% by volume.
Met.

As a result of a buckling point test of this shaft based on JIS S7026, the maximum load was 640 N. The shaft did not break when destroyed. Example 5 Using the same prepreg as used in Example 1, as a reinforcing layer, a hybrid prepreg A having a predetermined shape within a range of 600 mm from the small diameter portion and a carbon fiber prepreg B having a predetermined shape within a range of 400 mm from the small diameter portion. Example 2 except for winding
In the same manner as in the above, a shaft for a ski pole was produced.

As a result of a buckling point test of this shaft based on JIS S7026, the maximum load was 620 N. The shaft did not break when destroyed. Example 6 In the same manner as in Example 4, except that the same prepreg used in Example 1 was used and the hybrid prepreg A of the reinforcing layer was wound in a predetermined shape within a range of 750 mm and 500 mm from the small diameter portion, A shaft for a ski pole was prepared.

As a result of performing a buckling point test on this shaft based on JIS S7026, the maximum load was 660 N. The shaft did not break when destroyed. Example 7 The same PAN-based carbon fiber bundle and nylon 66 fiber bundle were aligned in the same direction and spread in a sheet shape. At this time, nylon 66
The interval between the fiber bundles was 30 mm. A hybrid prepreg E impregnated with B-stage epoxy resin (prepreg weight 247 g / m ² , fiber content 68% by weight) was prepared. The volume ratio of the nylon 66 fiber bundle with respect to 100% by volume of the reinforcing fiber composed of the carbon fiber and the nylon 66 fiber bundle of the hybrid prepreg E was 6% by volume.

From the tip of this shaft, 200 mm and 70 mm
When the end face of 0 mm was polished and observed with an optical microscope,
The hybrid part of the shaft, in which the fiber direction is parallel to the main axis, has nylon 66 in the carbon fiber-containing part.
The portion having the fiber bundle had a dispersed sea-island structure.
The thickness of the shaft excluding the reinforcing portion was 1.5 mm. The amount of nylon 66 fiber at 200 mm is 70
It was reduced by 26% by volume with respect to 0 mm. That is, the continuous fiber amount of the high elongation organic fibers disposed in the axial direction of the tubular body within the range of 200 to 700 mm from the tip is 74% by volume.
Met.

As a result of a buckling point test of this shaft based on JIS S7026, the maximum load was 600 N. The shaft did not break when destroyed. Comparative Example 1 PAN-based carbon fiber bundle (number of filaments 12,000, basis weight 0.804 g / m, tensile elongation at break 2.1%, tensile strength 4
900 MPa, tensile modulus 230 GPa)
Carbon fiber prepreg A (prepreg weight 261 g) impregnated with B-stage epoxy resin in a sheet-like shape
/ M ² , fiber content 67% by weight).

In the same manner as in Example 1 except that carbon fiber prepreg A was used instead of hybrid prepreg A,
A shaft for a ski pole was prepared.

At the end face of the shaft, the thickness of the shaft was 1.5 mm. JIS S of this shaft
As a result of performing a buckling point test based on 7026, the maximum load was 620N. At the time of destruction, fragments were scattered, the shaft was divided, and the fracture surface was in a form of a crushed shape. Comparative Example 2 The same nylon 66 fiber bundle as used in Example 1 was aligned and spread in a sheet shape. Nylon prepreg F impregnated with B-stage epoxy resin (prepreg weight 2
39 g / m ² , fiber content 58% by weight).

A shaft for a ski pole was produced in the same manner as in Example 1 except that a nylon prepreg F using no carbon fiber was used instead of the hybrid prepreg B.

At the end face of the shaft, the thickness of the shaft was 1.5 mm.

As a result of a buckling point test of the shaft based on JIS S7026, the shaft was bent and was not usable. The maximum load at this time was 35N. Comparative Example 3 The same as in Example 1 except that the same prepreg as used in Example 1 was used, and hybrid prepreg A was wound in such a shape that the length was greatly different between the small diameter portion and the large diameter portion as shown in FIG. Thus, a shaft for a ski pole was produced.

From the tip of this shaft, 200 mm and 70 mm
When the end face of 0 mm was polished and observed with an optical microscope,
The hybrid part of the shaft, in which the fiber direction is parallel to the main axis, has nylon 66 in the carbon fiber-containing part.
The portion having the fiber bundle had a dispersed sea-island structure.
The thickness of the shaft excluding the reinforcing portion was 1.5 mm. The amount of nylon 66 fiber at 200 mm is 70
For 0 mm, the volume was reduced by 42% by volume. That is, the continuous fiber amount of the high elongation organic fibers arranged in the axial direction of the tubular body within the range of 200 to 700 mm from the tip is 58% by volume.
Met.

As a result of performing a buckling point test on this shaft based on JIS S7026, the maximum load was 550 N. The shaft split at the time of destruction.

Table 1 summarizes the above results.

[0058]

[Table 1]

[0059]

According to the present invention, it is possible to provide a ski pole having the excellent characteristics of carbon fiber reinforced plastic such as light weight and high strength, and excellent in handleability.

Further, according to the present invention, it does not easily break at the time of destruction or does not break such as sacrifice or scattering. For example, after applying a compressive force in the axial direction of the tubular body,
It is possible to provide a ski pole which is not divided into two or more and has excellent safety.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a ski pole according to the present invention.

FIG. 2 is a cross-sectional view showing another example of the ski pole according to the present invention.

FIG. 3 is a plan view showing an example of a relationship between a prepreg shape used for forming a ski pole and a fiber orientation angle of the prepreg in the present invention.

FIG. 4 is a plan view showing an example of a prepreg shape of a ski pole and a winding method according to the present invention.

FIG. 5 is a plan view showing another example of a prepreg shape of a ski pole and a winding method according to the present invention.

FIG. 6 is a plan view showing still another example of a prepreg shape and a winding method of a ski pole according to the present invention.

[Explanation of symbols]

 1: a portion having a carbon fiber 2: a portion having a high elongation organic fiber 3: a hybrid portion 4: a non-hybrid portion 5: a portion having a glass fiber 6: a reinforcing layer 7: a stainless steel core 8: a prepreg 9: a fiber Prepreg oriented in the axial direction 10: Prepreg in which the fiber is inclined by θ with respect to the axial direction 11: Prepreg in which the fiber is inclined by −θ with respect to the axial direction

Claims (13)

[Claims] 1. A tubular body comprising carbon fibers and high elongation organic fibers aligned in the same direction, wherein said carbon fibers and said high elongation organic fibers are arranged in the axial direction of said tubular body. (1) On the cross section of the tubular body, the portion having the high elongation organic fiber is dispersed and arranged in the portion having the carbon fiber. (2) Within the range of 200 to 700 mm from the tip, the continuous fiber amount of the high elongation organic fibers arranged in the axial direction of the tubular body is at least 60% by volume in the high elongation organic fibers. A ski pole characterized by the following. 2. In the hybrid part, the volume fraction of the high elongation organic fiber to the volume ratio of 100% by volume of the reinforcing fiber composed of the carbon fiber and the high elongation organic fiber is in the range of 5 to 50% by volume. The ski pole according to claim 1, wherein: 3. The ski pole according to claim 1, wherein the hybrid portion has a fiber reinforced plastic layer disposed at least on the outer periphery. 4. The ski pole according to claim 3, wherein the reinforcing fibers of the fiber-reinforced plastic layer are glass fibers. 5. The ski pole according to claim 3, wherein the form of the reinforcing fibers of the fiber-reinforced plastic layer is a cloth. 6. The hybrid part has a carbon fiber reinforced plastic layer in which carbon fibers are arranged at least on the inner periphery in a range of ± 30 to ± 60 degrees with respect to the axial direction. The ski pole according to any of the above. 7. The ski pole according to claim 1, wherein the high elongation organic fibers disposed in the hybrid portion are nylon fibers. 8. The ski pole according to claim 1, wherein said carbon fiber is a PAN-based carbon fiber. 9. The ski pole according to claim 1, wherein the ski pole is not divided into two or more pieces after being broken by applying a compressive force in an axial direction of the tubular body. 10. The ski pole according to claim 1, wherein the ski pole has a reinforcing layer comprising a hybrid portion within a range of 0 mm to 800 mm from the tip of the tubular body. . 11. The ski pole has a reinforcing layer made of at least one selected from carbon fiber and glass fiber within a range of 0 mm to 600 mm from the tip of the tubular body. The ski pole according to any one of 10 above. 12. When there are a plurality of said reinforcing layers,
12. The ski pole according to claim 11, wherein the exhaustion points of the reinforcing layers are at least 50 mm apart. 13. The ski pole according to claim 1, wherein the ski pole is composed of a hybrid portion having a aligned carbon fiber bundle and a high elongation organic fiber covering the bundle.
13. The ski pole according to any one of 12.