JPS61280880A - Light weight ski pole - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lightweight ski pole, and more particularly, the present invention relates to a lightweight ski pole, and more particularly, a unidirectional carbon fiber layer with a cloth made of carbon fiber, aramid fiber, or reinforced glass as the upper layer. The present invention relates to a lightweight ski pole having a combined multi-layer hybrid construction.

[Conventional technology]

Conventionally, ski poles have been made of aluminum alloy for alpine skiing, and made of aluminum alloy for Nordex skiing, but also made of a combination of unidirectional carbon fiber reinforced plastic (CFRP) and aluminum alloy, or CFRP and glass fiber reinforced plastic. (GFRP)
A hybrid configuration is known.

[Problem that the invention seeks to solve]

However, in conventional ski poles for alpine skiing or Nordex skiing, those made of aluminum alloy have a vibrator whose wall thickness increases toward the tip, which causes the center of gravity of the ski pole to move away from the grip, resulting in poor maneuverability. There are inferior problems, and CFRP
It had the disadvantage that it was heavy (specific gravity approximately 2.7) compared to aluminum alloy (specific gravity approximately 1.6). Furthermore, conventional ski poles using carbon fibers are unidirectional, oriented in the direction of the pole axis, and placed in the outermost layer, so if the carbon fibers are bent, they become thorny, which poses a safety problem. Ta.

Therefore, as a result of intensive research and trial production in order to overcome the above-mentioned problems, the inventor developed a unidirectional ski pole using carbon fiber, aramid fiber, or reinforced glass fiber cloth, which is not used in conventional ski pole construction, as the top shoe. By adopting a ski pole structure consisting of a multilayer hybrid structure with carbon fiber layers, it is possible to reduce the weight of the ball, move the center of gravity closer to the grip, and improve flexibility and maneuverability. In addition, by changing the ratio or order of use of carbon fiber cloth, aramid fiber cloth, or reinforced glass m fibers, or by changing the 5i of cloth.
By changing the orientation angle of iia with respect to the pole axis,
The present invention was completed by discovering that the rigidity of the ball can be adjusted.

Therefore, an object of the present invention is to provide a ski pole with a multilayer hybrid structure that is lightweight, flexible, has a center of gravity close to the grip, has improved operability, and does not become splintered even if bent, and has improved safety. It is on offer.

Another object of the present invention is to provide a ski pole in which balls of various rigidities can be easily prepared to suit the purpose of the ski pole user.

Means for Solving Problem C] In order to achieve the above object, in the lightweight ski pole according to the present invention, a multilayer hybrid is formed by combining a cross layer of carbon fiber, aramid IaM or reinforced glass fiber, and unidirectional carbon muH. A ski pole consisting of a tubular body is characterized in that a cross layer of carbon fiber, aramid fiber or reinforced glass fiber is used for the uppermost shoe.

The multi-layer hybrid construction allows for various combinations and is appropriately designed according to the required weight, flexibility and handling performance of the ski pole, but the cloth layer must always be the top layer. As a general standard multi-layer hybrid structure, illustrated by the cross section of a ski pole in Figure 1, the uppermost shoe consists of one layer of carbon fiber cloth (C), aramid fiber cloth (K), or reinforced glass fiber cloth (G). Consisting of two layers, the cloth is woven using these fibers for the warp and weft. The middle layer is a unidirectional carbon fiber layer (
UD) uses epoxy resin as a matrix. The lower layer has the same structure as the top shoe. 1st
As a standard multi-layer hybrid construction with stronger reinforcement than the ski pole shown in the figure, the ski pole with the cross section shown in FIG. It is what it is.

In C, G, each warp thread is 0 with respect to the ski pole axis direction.
The LID is configured to be oriented at ~20 degrees, and the long carbon fiber direction of the LID is aligned with the pole axis direction.

[Action of the invention]

Even if the ski pole of the present invention shown in FIGS. 1 and 2 were to bend, the C
By the cross layer of UD layer carbon! IH was prevented from breaking until it became a thorn-like shape, and a thorn-like shape was also generated.

Even if it is inside the cloth layer, danger is prevented.

By orienting the longitudinal fibers of the cross layer at an angle of 0 to 20 degrees with respect to the ball axis, it is possible to easily adjust the rigidity to various degrees even with the same material composition.

Further, in the same material configuration, the degree of rigidity can also be changed by changing the configuration order of the multilayer hybrid layers. This relationship is shown in the graph of Figure 6, where curves ■ and ■ indicate changes in stiffness due to changes in the orientation angle of the cross-warp fibers, and curves ■ and ■ indicate changes in stiffness due to changes in the order of composition of the multilayer hybrid layer. Due to this change, it is possible to manufacture balls of various rigidities with the same material composition, and it is possible to meet the purpose and request of the user. Furthermore, since the material configurations shown in FIGS. 1 and 2 have an average specific gravity of about 1.6, they can be constructed to be about 50% lighter than aluminum alloy (specific gravity 2.7) and improve operational performance. In the case of a ball with the same structure (Comparative Example 1), the number of points 11 is reduced by 28% compared to the conventional ski pole. In addition, in this comparative example, the balance index (B
) is 75% of conventional aluminum alloy alpine ski poles, and the B value is less than 75%, which improves operability, reduces weight, reduces strain on hands, and reduces inertia force. This enables quick operation and improves operational performance.

〔Example〕

Examples of the present invention will be shown below, but the present invention is not limited thereto.

Example 1 Production example of ski poles for alpine skiing Unidirectional carbon fiber epoxy resin...LID aramid fiber cloth...Carbon fiber cloth...C Reinforced glass fiber cloth...G Each cloth is made in advance Impregnated with epoxy resin.

1) Cut out the required amount of each of the above materials into the shape shown in FIG. 3(a).

2) The cut materials are wound and laminated around a mandrel in the order of UD++uD+C [Fig. 3(b)].

3) Wrap pressure tape on top of the laminated material (Fig. 3 (
C)].

4) Heat and mold the material wrapped with pressure tape.

5) Pull out the mandrel after forming. The cross section is shown in Figure 3 (d
).

6) Process and attach accessory parts to create a finished product.

Example 2 According to the method of Example 1, the following three types of alpine ski poles were manufactured.

■ The material combination order is UD 1K + K+・UD
It was wound around a mandrel in the order of +C, but the longitudinal fibers of K and C were oriented parallel to the ball axis direction, that is, at 0 degrees.

■ Unlike ■ above, the direction of the K and C m fibers is 10 degrees to the ball axis direction, that is, the horizontal fibers are 8 degrees to the ball axis direction.
It was oriented at 0 degrees and wound.

■ The material combination order is UD 10 + UD 10 + C, or 3. The vertical fiber direction of K and C is parallel to the ball axis direction.
That is, it was wound with an orientation of 0 degrees.

The resulting ski pole had a length of 125 Cffi,
Select a length of 100 cm at the center, support both ends on the knife blade as shown in Figure 5, and calculate the relationship with the displacement y of the ball when a load P is applied to the center. Shown in the graph in Figure. In addition, an aluminum alloy (
7001) was shown as a control.

As can be seen from Figure 6, the rigidity of the ball can be changed by changing the orientation angle of the vertical fibers of the cloth with respect to the ball axis direction and by changing the order of combination of materials. While providing a certain degree of rigidity, the ski pole of the present invention can be modified to suit the user's desired objectives.

For example, when the load is 10 kg, the aluminum alloy has a displacement of 21 m, but in the case of the present invention, ■ is 14°4, and ■ is 19.
2#, ■ is a displacement of 21.8 degrees, and compared to ■, which is close to the rigidity of the control aluminum alloy ■, ■ is 34%,
■ is given a displacement of 12%.

Comparative Example: An alpine ski pole (material aluminum alloy 7001) with the same dimensions as the example and an example ski pole (length 1
25 cm).

1) Weight comparison of tubes only Conventional product...139g Example amount...100g Therefore, the weight of the example was 28% less than that of the conventional product.

2) Comparison of balance index The balance index (B) is determined by the dimensions shown in Figure 4 as follows: Distance to center of gravity (α)] As a general standard regarding the operability of ski poles, it is said that ski poles with a balance index (B) of 75% or less are easy to photograph; As a result of tests carried out by instructors, etc., we were able to obtain opinions that there was no strain on the arms and that the operability was very good.

〔Effect of the invention〕

According to the lightweight ski pole of the present invention, the weight reduction reduces the burden on the hands, and as the center of gravity approaches the grip, the inertia of the ski pole is reduced, making it possible to operate quickly and improving operational performance. You can improve. By changing the orientation angle of the fiber cloth used with respect to the pole axis, balls of various rigidities can be easily adjusted using the same material, making it possible to match the user's preference.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a general standard ski pole according to the present invention, FIG. 2 is a cross-sectional view of a standard ski pole with high strength made by the ski pole of FIG. 1, and FIGS. d) is an explanatory diagram of the manufacturing process of the ski pole according to the present invention; (a)
is a perspective view of a cut sheet of the material to be wound, (b) is an explanatory view of winding and laminating sheets on a mandrel, (C) is an explanatory view of winding a pressure tape around the laminated material, (d)
4 shows the cross-sectional view of the completed ski pole, FIG. 4 is an explanatory diagram showing the dimensions for calculating the balance index of the finished ski pole with the exterior, and FIG. 5 shows the multilayer hybrid ski pole according to the present invention. An explanatory diagram of a method for measuring changes in stiffness when the orientation angle of the longitudinal fibers of the cloth is changed with respect to the pole axis direction in the cloth layer used in the construction,
FIG. 6 is a graph showing the results of measuring changes in rigidity of the ball using the measurement method shown in FIG. 10... Material 12... Mandrel 14... Pressure tape FIG, 4 FIG, 2K -
1 - Arami 1 8 spindles Waro Mata G ----- An example of Higapusu 1 Ma Guro Mata uo -----
- force direction ml carbon weft stitch FIG, 3 FIG, 5 FIG, 6 direction P (KQI

Claims (4)

[Claims] (1) In a ski pole consisting of a tubular body with a multi-layer hybrid structure consisting of a cross layer of carbon fiber, aramid fiber or reinforced glass fiber and a unidirectional carbon fiber layer, the uppermost shoe is made of carbon fiber, aramid fiber or reinforced glass fiber. A lightweight ski pole characterized by the use of cross layers. (2) The lightweight ski according to claim 1, wherein the multilayer hybrid structure consists of three or four layers of alternating cross layers of carbon fibers, aramid fibers, or reinforced glass fibers and unidirectional carbon fiber layers. Pole. (3) The lightweight ski pole according to claim 2, wherein the cross layer of carbon fiber, aramid fiber, or reinforced glass fiber is composed of one or two layers. (4) Claims 1 to 3 in which the orientation angle of the cross fibers with respect to the axial direction of the ski pole is selected from 0 to 20 degrees.
The lightweight ski pole according to any one of paragraphs.