JPH0428614Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is based on fiber-reinforced plastics (hereinafter referred to as this) which are laminated as strength members on the upper and lower surfaces of the core material.
Regarding skis using FRP (abbreviated as FRP), in particular, the modulus of elasticity in the ski width direction of FRP laminated on the upper and lower surfaces of the core material in at least both the front and rear parts of the ski body is higher for the lower FRP than for the upper FRP. By increasing the size, it is possible to prevent concave formation in low-temperature environments and improve sliding performance.

[Prior Art] Conventionally, in skis, in order to ensure the stability of the arch bent height of the ski body against temperature changes, the elastic modulus in the longitudinal direction of the FRP laminated on the upper and lower surfaces of the core material and the linear expansion coefficient,
By balancing the elastic modulus of the sole edges attached parallel to the longitudinal direction of the ski at both left and right ends of the sliding surface of the ski body, the structure has been designed to minimize the rate of change in temperature of the arch vent. ing.

[Problem to be solved by the invention] However, in the case of the ski with the conventional structure described above, the elastic modulus of the sole edges attached parallel to the longitudinal direction of the ski at both left and right ends of the running surface of the ski body is In order to achieve height stability,
While it greatly contributes to the bending stiffness of the ski body in the ski longitudinal direction, it hardly contributes to the bending stiffness of the ski body in the ski width direction.

Moreover, the FRP laminated on the upper and lower surfaces of the core material of the ski body is balanced so that it contributes to the bending rigidity of the ski body in the longitudinal direction of the ski, together with the sole edge. It is designed so that the elastic modulus and linear expansion coefficient in the longitudinal direction are approximately equal.

As a result, the modulus of elasticity and coefficient of linear expansion in the ski width direction of the upper FRP and lower FRP, which are laminated on the upper and lower surfaces of the core material of the ski body, become unbalanced with respect to each other because the elastic modulus of the sole edge does not contribute. , the elastic modulus of the upper surface FRP in the ski width direction is larger than that of the lower surface FRP.

In addition, the mountain line and
When deforming the part of the ski in the width direction so as to form a valley line, the elasticity of the sole edge does not contribute to the neutral plane in terms of bending rigidity, so the slope line is deformed in the ski width direction. Because it is located above the neutral plane in terms of bending rigidity when deforming the longitudinal part of the ski, the lower surface is made of a synthetic resin with a high coefficient of linear expansion and reinforcing fibers with a low coefficient of linear expansion. In the case of FRP, the coefficient of linear expansion of the synthetic resin has a relatively large effect in the ski width direction.

For this reason, in a low-temperature environment, the sliding surface of the ski body deforms in the ski width direction and curves into a concave shape (hereinafter referred to as a concave tendency) so that a valley line is formed in the longitudinal direction of the ski. .

This concave tendency is particularly noticeable near the front and rear parts of the ski, where the thickness is thin and wide, and the sole edges attached to both left and right ends of the ski in the width direction are larger than the sliding surface between the sole edges. It became slightly protruding from the snow surface,
As a result, there was a problem in that the effectiveness of the edges during sliding became excessive, impeding rotational maneuverability, and reducing sliding performance (rotational performance).

[Purpose of the invention] The purpose of the invention is to provide a ski that can prevent concave formation on the sliding surface in a low-temperature environment and improve rotational maneuverability during skiing.

[Means for solving the problem] In order to solve the above problem, this invention
In at least both the front and rear parts of a ski body in which strength members made of FRP are laminated and integrated on both the upper and lower surfaces of the core material, the elastic modulus in the ski width direction of the FRP of the lower strength member constituting the ski body is calculated as The elastic modulus of the strength member FRP in the ski width direction is greater than that of the strength member.

At this time, if the FRP laminated on the lower surface of the core material of the ski body is laminated from two or three or more layers of FRP with different types of fiber arrangement, only one of the layers contributes to the stiffness. The effects of the invention can be obtained if at least some of the layers where the rate is the main factor have the features of this invention.

[Function] In other words, by adopting the above-mentioned structure, this invention can improve the strength of the ski body at least in both the front and rear parts of the ski body, which is made by laminating and integrating strength members made of FRP on both the upper and lower surfaces of the core material. Since the elastic modulus of the lower surface strength member in the ski width direction is greater than the elastic modulus of the upper surface strength member in the ski width direction, the conventional concave tendency of the ski running surface in a low temperature environment is prevented.

[Example] This invention will be described in detail below based on the illustrated example.

FIG. 1 shows a ski according to this invention, and numeral 1 in the figure is the ski body.

As shown in FIG. 2, this ski body 1 has a sandwich structure in which an upper surface strength member 3 and a lower surface strength member are laminated and integrated on both upper and lower sides of a core material 2.

The upper surface strength member 3 constituting the ski body 1 is made of glass fibers or carbon fibers crossed in the ski longitudinal direction and ski width direction, or reinforcing fibers made of a combination of glass fibers and carbon fibers impregnated with synthetic resin. Multiple layers of hardened
While it is made of FRP, the lower surface strength member 4 is also made of glass fibers or carbon fibers crossed in the ski longitudinal direction and ski width direction, or reinforcing fibers made of a combination of glass fibers and carbon fibers, etc., impregnated with a synthetic resin and hardened. Multi-layer FRP41,
It consists of 42 and 43.

Furthermore, at least both the front and rear parts of the ski body 1, for example, as shown in FIG. The fiber arrangement density (number) of the reinforcing fibers inside the ski is arranged more densely in the ski longitudinal direction than in the ski width direction, thereby increasing the elastic modulus of the lower surface strength member 4 of the ski body 1 in the ski width direction. It has a structure in which the elastic modulus is larger than that of the ski in the longitudinal direction and larger than the elastic modulus of the upper surface strength member 3.

Further, in the figure, reference numeral 5 denotes a decorative surface plate provided on the upper surface of the ski body 1, 6 a sliding surface plate provided on the lower surface of the ski body 1, and 7, 7 attached to both left and right ends of the lower surface of the ski body 1. A sole edge 8 is a space member provided between the lower surface strength member 4 and the running face plate 6 of the ski body 1.

In the above embodiment, when the elastic modulus of the lower surface strength member 4 of the ski main body 1 in the ski width direction is made larger than the elastic modulus of the upper surface strength member 3, the reinforcing fibers in the FRP 43 of the lowest layer of the lower surface strength member 4 are This was done by arranging the fiber arrangement density (number) in the ski width direction more densely than in the ski longitudinal direction, but in other embodiments, carbon fibers or , a material with a high elastic modulus such as a combination of carbon fiber and glass fiber is used, while a material with a relatively low elastic modulus such as glass fiber is used as the fibers arranged in the longitudinal direction of the ski, and the fibers are arranged in the ski width direction. It is also possible to use a material with a higher elastic modulus for the fibers arranged in the longitudinal direction of the ski, and to make the fiber materials different from each other in this way.

In addition, the center part of the ski body 1 has a thick wall.
Since the change in the modulus of elasticity in the ski width direction due to the lower surface strength member 4 is hardly affected, if this invention is applied at least to the front and rear parts of the ski, which are wide and thin, the functions and effects of this invention can be fully achieved. I can do it.

In this case, the applicable areas are, for example, 0 to 200 mm outward from both the front and rear contact points a and b of the ski, and inward.
A range of 200-500mm is valid.

[Effects of the invention] As explained above, this invention makes the elastic modulus of the lower FRP strength member in the ski width direction larger than the elastic modulus of the upper FRP strength member in the ski width direction in at least both the front and rear parts of the ski body. Therefore, it is possible to reliably prevent concave formation on the ski running surface under a low-temperature environment as in the past.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the ski according to the invention, and FIG. 2 is a partially enlarged sectional view taken along the line of FIG. 1. DESCRIPTION OF SYMBOLS 1... Ski body, 2... Middle core material, 3... Upper surface strength member, 4, 41, 42, 43... Lower surface strength member, a... Front contact point, b... Rear contact point.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) At least in both the front and rear parts of the ski body, which has strength members made of FRP laminated and integrated on both the upper and lower surfaces of the core material, the lower strength members constituting the ski body A ski board characterized in that the elastic modulus of FRP in the ski width direction is greater than the elastic modulus of the FRP of the upper surface strength member in the ski width direction. (2) Utility model registration claim No. 1, characterized in that the reinforcing fibers of at least some layers of FRP of the lower surface strength member are arranged in a denser fiber arrangement in the ski width direction than in the ski longitudinal direction. The ski according to item 1. (3) Fibers arranged in the ski width direction of the reinforcing fibers of at least some layers of the FRP of the lower surface strength member are made of a material with a higher elastic modulus than fibers arranged in the ski longitudinal direction. A ski according to claim 1 of the utility model registration claim.