JP2512504B2 - Ski pole - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to ski poles, and in particular to a lightweight pole that is flexible.

(Prior Art) In addition to a conventional ski pole made of an aluminum alloy for a Nordex ski, the alloy is used as an inner layer and a layer in which a unidirectional carbon fiber material is fixed by a resin is integrally formed on the outer layer. A pole laminated with a resin, a pole in which a unidirectional material using carbon fiber and glass fiber is fixed with a resin, and further a resin fixed inner layer of a unidirectional material of carbon fiber disclosed in JP-A-61-280880. There is a pole in which a layer of carbon resin, aramid fiber or glass fiber cloth fixed with resin is integrally laminated as an outer layer.

(Problems to be Solved by the Invention) Among these conventional ski poles, an aluminum alloy pole is disadvantageous in that it is heavy. The pole made of a combination of aluminum and carbon fiber has a drawback in safety because the outer layer carbon fiber is used as a unidirectional material and the fiber is easily broken when the pole is largely bent. A pole made of a combination of carbon resin and glass fiber is also a problem because the glass fiber is apt to be broken especially when it is bent. JPA
The pole described in Japanese Patent No. 61-280880 can withstand a certain degree of bending, but is still insufficient.

An object of the present invention is to provide a pole that is lightweight and has large bending.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention has a structure of a pole different from the prior art, in which a layer of wholly aromatic polyester fiber cloth is fixed with a resin as an outer layer of the pole. It is characterized in that it is provided. Further, in the present invention, particularly excellent results are obtained when the inner layer and the intermediate layer with respect to the outer layer are laminated layers of carbon fiber and glass fiber, respectively.

That is, according to the present invention, a plurality of fiber layers adhered with a resin are integrally laminated from the inside to the outside of the ski pole, and the outside layer is a layer in which a cloth of wholly aromatic polyester fiber is adhered with a resin. It is a characteristic ski pole,
More preferably, the ski pole is characterized in that the fiber layers fixed with the resin are integrally laminated in the following order in order from the inside to the outside of the ski pole.

Inner layer; layer of carbon fiber unidirectional material fixed with resin Intermediate layer; layer of glass fiber unidirectional material or cloth fixed with resin Outer layer: layer of wholly aromatic polyester fiber cloth fixed with resin In the ski pole of the present invention, the outer layer is formed by fixing a cloth of wholly aromatic polyester fiber with resin.
The reason why the wholly aromatic polyester fiber is used is that it is possible to cope with the large bending of the pole as compared with the conventional carbon fiber, aramid fiber or glass fiber, that is, the surface outer layer fiber does not bend or fluff even if it bends more than before. This is because. Further, the outer layer is less suitable because it is less flexible than when used as a cloth used as a unidirectional member. The wholly aromatic polyester used in the present invention is a molten liquid crystal polyester which contains hydroxybenzoic acid as one component and is copolymerized with hydroxynaphthoic acid, bisphenol, terephthalic acid and other aromatic ring-containing monomers.
About 10 mol% of the aromatic ring-containing monomer may be replaced with an aliphatic monomer. Such fibers are generally high performance fibers having a strength of 20 g / d or more and a Young's modulus of 600 g / d or more. The type of resin used for fixing is typically an epoxy resin because of the hardness of the resin and the ease of finishing, but an unsaturated polyester resin may be used. By having such an outer layer, the ski pole of the present invention achieves the above-mentioned object, but more preferably, it has an inner layer and an intermediate layer as described above. Is. The inner layer and the intermediate layer will be described below.

First, even if the inner layer is a resin fixing layer of carbon fiber, it is not used as a cloth, but in order to have strength in the longitudinal direction due to the basic structure of the pole, it is a resin of unidirectional material. It is preferably used as a fixing layer. The resin used may be the same as that used for the outer layer. The number of wound layers of the inner layer is the same for the intermediate layer and the outer layer, but one or more layers can be appropriately selected depending on the thickness (fiber amount, resin amount) of each layer used. Generally, the unidirectional material has a thickness of about 0.1 to 0.15 mm for one layer, and the cloth has a thickness of about 0.2 to 0.25 mm for one layer, so that the number of turns of each of the inner layer, the intermediate layer, and the outer layer can be arbitrarily determined.

Next, the intermediate layer is a unidirectional member of glass fiber or a cloth to which a resin is fixed. Since the intermediate layer has a structure sandwiched between the inner and outer layers, the glass fiber may be used as a unidirectional material or as a cloth as long as it is a glass fiber. One reason for using this intermediate layer is to retain the strength of the highly flexible and sticky fiber layer used as the outer layer. Another reason is that the carbon fiber of the inner layer does not cut sufficiently to withstand the impact, so that the point is covered. The resin used for this layer is also selected from the above-mentioned resins and the like.

As described above, the pole of the present invention is preferably composed of three layers of an inner layer, an intermediate layer and an outer layer. Even in such a case, if necessary, the pole was fixed to each layer or the inside of the inner layer with a resin. A fiber layer or the like may be present.

The unidirectional material referred to in the present invention is a sheet formed by aligning fibers in one direction and adhering a resin thereto, and in the present invention, the unidirectional material is such that the fibers are oriented in the length direction of the pole. Alternatively, it is preferable to form the unidirectional material so that the fibers are oblique with respect to the length direction of the pole.

(Effects of the Invention) With the configuration of the pole of the present invention, it is possible to provide an ideal pole that is light and has a large flexure and does not cause thorns or fluffing of fibers. According to the pole of the present invention, the weight is 20 to 30% lighter than that of the aluminum alloy stock, and the degree of the flexure is as shown in Japanese Patent Application Laid-Open No. Sho 61-61.
It is 15-20% larger than the pole disclosed in Japanese Patent No. 280880, and can be safely used by skiers.

(Example) Using the following fiber layers as an inner layer, an intermediate layer, and an outer layer, length
A 100 cm ski pole was made. The manufacturing is done by winding a pre-preg impregnated with a required amount of three layers of epoxy resin (Epikote 210 from Ciel Epoxy Co., pre-cure condition 160 ° C × 1 hour, after-cure condition 170 ° C × 3 hours) on a rotating mandrel and then after-cure. Then I pulled it out of the mandrel.

Inner layer; unidirectional carbon fiber thickness 0.1 mm x 3 turns Middle layer: glass fiber cloth thickness 0.25 x 4 turns Outer layer: 70:30 polyester of oxybenzoic acid and oxynaphthalic acid Fiber cloth thickness 0.2mm x winding 3
The weight of this pole is 90g, 5cm from each end is fixed, and the width of the deflection by 3 point bending with a load of 10kg from the top of the pole at the center of 90cm length is 3cm. No thorns or fluffs of fibers were observed.
The weight of an aluminum alloy pole of the same size is 11
It was 0g.

(Comparative Example) As an example of a ski pole disclosed in JP-A-61-280880, the inner layer and the intermediate layer are made of the same material and have the same number of windings as those of the embodiment, and the outer layer and the intermediate layer are made of the same material (however, the number of windings is two. As a result, a pole was prepared. The weight of this pole was also 90 g, but the width of deflection due to three-point bending was 2.3 cm, and it was found that the pole deflection under the same load was inferior to that of the present invention.

Claims (2)

(57) [Claims] 1. A plurality of fiber layers fixed to each other with a resin are integrally laminated from the inside to the outside of a ski pole, and the outer layer is a layer obtained by fixing a cloth of wholly aromatic polyester fiber with a resin. A characteristic ski pole. 2. The ski pole according to claim 1, wherein the fiber layers fixed with the resin are integrally laminated in this order from the inside to the outside of the ski pole. Inner layer: layer of carbon fiber unidirectional material fixed with resin Intermediate layer: layer of glass fiber unidirectional material or cloth fixed with resin Outer layer: layer of wholly aromatic polyester fiber cloth fixed with resin