JPH0243411Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a ski using a mica-reinforced plastic reinforcing plate as a reinforcing plate. Traditionally, reinforcing plates used as strength members for skis include aluminum alloy plates, glass fiber reinforced plastic plates (hereinafter referred to as GFRP plates), aramid (trade name: Kevlar 49), and fiber reinforced plastic plates (hereinafter referred to as GFRP plates). KFRP board), carbon graphite fiber reinforced plastic board (hereinafter abbreviated as CFRP board), etc. are used. When aluminum alloy plates are used as reinforcing members, the elastic modulus of the ski improves, but their high density increases the weight of the ski, and machinability is poor, and surface treatment is required to improve adhesive strength. It has drawbacks such as the need for primer treatment and a time-consuming process. Furthermore, because of its large coefficient of thermal expansion, it has the disadvantage that the arch camber of the ski undergoes significant dimensional changes due to changes in temperature. When using GFRP board as a reinforcing member,
Compared to aluminum alloy plates, the specific strength is improved, but the specific elasticity is lower, and the ski has disadvantages such as warping and twisting. When KFRP plates are used as reinforcing members, they have lower density and higher tensile strength than aluminum alloy plates or GFRP plates, but they have lower compressive strength, lower elastic modulus, and require cutting. It has the disadvantage of being extremely poor in quality. When using CFRP board as a reinforcing member,
It has higher specific strength and specific elasticity than aluminum alloy plates, GFRP plates, KFRP plates, etc., making it an ideal material for reinforcing materials for skis.
Because they are more expensive than skis, KFRP boards, etc., they have drawbacks such as not being able to be used in general skis. In view of these shortcomings of conventional ski reinforcing plates, and considering the physical properties and price, the present invention uses a mica-reinforced plastic plate as a reinforcing member for popular type skis. The purpose was to provide inexpensive and durable skis to the Japanese market. The gist of the present invention is that a ski is formed using mica-reinforced plastic plates either between the layers of the core material and the side materials, or between the layers of the core material or the side materials that make up the main body of the ski. It's skiing. As shown in Table 1, the mica-reinforced plastic plate used in this invention has a density similar to that of aluminum alloy.
It is lighter than GFRP and has the second highest elastic modulus after CFRP. The specific elasticity is also the same for CFRP and KFRP.
The value will be close to . Also, like aluminum alloy, it is an isotropic material, so unlike anisotropic materials such as CFRP, KFRP, and GFRP, its strength and elasticity do not vary depending on the direction, which gives it an added advantage as a reinforcing material. It is something.

[Table] As an embodiment of the present invention, as shown in FIG. 2, a mica-reinforced plastic reinforcing plate 3 with or without holes of an arbitrary shape is provided between the layers of the core material 5 of the ski. By intervening, it is possible to improve the bending strength of the core material itself,
Dimensional stability is also improved, which increases the bending strength of the ski, reduces warpage and twisting, and reduces dimensional changes in the arch chamber of the ski due to temperature changes. In addition, the elasticity distribution of the core material can be freely adjusted by changing the usage ratio of the mica-reinforced plastic plate and the position at which it is interposed in the core material. In addition, by using it for the side material 2 of skis,
In addition to being able to prevent the occurrence of lateral warping and twisting, it is also possible to improve torsional strength. As described above, the mica-reinforced plastic reinforcing plate of the present invention is more isotropic than conventional reinforcing plates, so it can improve not only the bending strength but also the torsional strength. In addition, since the coefficient of thermal expansion of mica itself is small,
This invention, which uses a mica-reinforced plastic reinforcing plate, can minimize dimensional changes in the arch chamber due to temperature changes, has good machinability, and is cheaper than CFRP or KFRP plates. It has great effects, such as being able to be used for popular types of skis. Furthermore, by setting the ratio of matrix resin in the mica-reinforced plastic reinforcing plate to about 30% ± 10%, the interlaminar strength of the mica-reinforced plastic plate is significantly improved. This produces a synergistic effect and improves durability.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a ski, and FIG. 2 is a cross-sectional perspective view of a main part showing an example of implementation between layers of core material. FIG. 3 is a cross-sectional perspective view of essential parts showing an example of implementation between the layers of the core material and the side material. 1... Ski body, 2... Side material, 3... Mica-reinforced plastic reinforcement plate, 4... Hole, 5... Core material.

Claims (1)

[Claims for Utility Model Registration] (1) Use of mica-reinforced plastic reinforcing plates in which mica is matrixed with synthetic resins such as epoxy resins and polyester resins between the layers of the core material that constitutes the ski body and/or as side materials. A ski that is characterized by: (2) The ski according to claim 1, wherein the mica-reinforced plastic reinforcing plate is provided with holes of arbitrary shapes.