JPH01113083A - Ski and method for its manufacture - Google Patents

Abstract

PURPOSE: To inexpensively form a ski board good in sliding properties by providing a protruding part on the upper surface of the ski board and improving various characteristics in the ski board such as rigidity, twist strength, vibration attenuation properties, vibration response or air resistance. CONSTITUTION: An under surface constituting member 2 and a core member 4 are preliminarily arranged to a low mold 5 and a semi-solid resin 7 of which the amt. corresponds to the vol. of a protruding part 8 and an upper surface material 11 are placed to be clamped, heated and cured under pressure by an upper mold 6 having a recessed surface 10 provided thereto to integrally form a ski board. As the semi-solid resin 7, a putty like epoxy resin and other urethane resin is used to make it possible to well perform molding. Further, by changing a resin compsn, a molded product ranging from high rigidity to low rigidity having flexibility can be obtained and desired vibration attenuation properties can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a ski in which an upper surface protrusion of an arbitrary shape is formed on the upper surface component of the ski, and a method for manufacturing the same.

(Prior Art) Conventionally, skis have been made of wood, FRP, metal φ glass, etc.

In ancient times, wooden skis often had chevrons or other ridges on the top side to maintain strength, but these skis were heavy, had poor maneuverability, and lacked bending rigidity. Skis have gradually become flat and have been replaced by high-performance skis made of FRP or metal.

Nowadays, skis have a double-tapered shape where the thickness gradually increases from the tip to the center and gradually decreases from the center to the rear end, and the top surface is flat. It's becoming common.

As for the structure, a sandwich structure in which reinforcing members such as FRP boards are arranged on the upper and lower surfaces of a core material, and a box structure in which reinforcing members are arranged around the entire circumference of the core material are known.

These structures are commonly used by ski manufacturers because the manufacturing process is easy.

However, when considering skis from the viewpoint of physical properties,
There were seven extremely difficult problems in the design, including how to balance and balance various properties that influence each other, such as torsional strength, bending strength, vibration damping, and air resistance.

For example, if the torsional strength of a ski is improved, the bending strength will increase, resulting in a ski with a stiff waist, and the vibration damping performance will also decrease, which has the disadvantage of having a negative impact on skiing performance. was.

In addition, in order to reduce the air resistance of skis while skiing, we have made holes of any arbitrary shape in the shovel part at the tip of the ski, and by making the rise of the shovel part as low as possible. Efforts have been made to suppress the resistance and increase the sliding speed, but these methods have the disadvantage that the manufacturing process is time-consuming and increases the manufacturing cost.

Therefore, it is desired to develop skis that have soft elasticity, high torsional strength, good vibration damping properties, and low air resistance by combining materials with various characteristics, and various research is being carried out. Although development is underway, a satisfactory ski has not yet been provided.

Therefore, the inventors changed the upper surface shape of the ski from the conventional flat plate with N We have provided skis with improved gliding properties (Special Publication No. 6l-41234).

However, skis with the above-mentioned chevrons and other raised parts have conventionally been manufactured by incorporating reinforcing members such as gliding surface materials, steel edges, edge liners, etc. into the lower mold for forming skis, and then hard After arranging the ridge forming auxiliary material in which the core material is coated with a wire, the upper surface member is placed, and an upper mold having a concave surface for ridge formation is placed on the upper surface member, followed by pressing and heating hardening. Therefore, a method of forming a chevron or other raised portion on the upper surface side has been used.

(Problems to be Solved by the Invention) According to this method, in order to form the raised portions, it is necessary to cover the soft core material with a fiber-reinforced member in advance. This increases the number of work steps, leading to higher costs. Considering the above-mentioned forming method, the material used to form the bulge is limited to soft materials because the shape is formed by pressing, and the range of material selection is limited. It requires processes such as molding or cutting to shape it, and also requires shape accuracy, which has led to high costs.

(Means for Solving the Problems) Therefore, in view of these conventional drawbacks, the present invention more easily provides a protrusion on the upper surface of the ski, and improves rigidity, torsional strength, vibration damping property, vibration response, air resistance, etc. The objective was to provide skis with good glide performance at low cost by improving the various characteristics of skis.

The present invention provides a ski in which an upper surface component protrusion is formed at a desired position in the longitudinal direction of the upper surface of the ski core material, and is integrally bonded with the upper surface component and the lower surface component,
The means for this purpose is a ski in which a semi-solid resin conforming to the shape of the protrusion for protruding the upper surface component is placed and hardened on the upper surface component. As shown in FIG.
are placed in the lower mold 5, semi-solid resin 7 in an amount corresponding to the volume of the protruding part 8 and the upper surface material 11 are placed, and the upper mold 6 having the concave surface 10 is pressed and heated to harden the ski. It is used to mold.

The semi-solid resin 7 used in the present invention is manufactured by Ciba Geigy! ! XNR6101/XNH6101,X
By using a putty-like epoxy resin such as NR6102/XNH6102 or other urethane resin, it is possible to form the molding well. Furthermore, by putting microballoons or the like into the semi-solid resin 7, it is also possible to reduce the weight. Furthermore, by changing the resin composition, it is possible to obtain a molded product having high rigidity or a flexible low rigidity molded product, and desired vibration damping properties can be obtained.

In addition, carbon fiber, glass m &
It is also possible to add short fibers made of various reinforced 1a fibers including 1t and aramid 1a fibers, whiskers, ceramic powder, etc.

(Function) As described above, the present invention uses semi-solid resin for the upper surface component, so that as shown in FIGS. 5 to 7,
When the upper mold 6 is pressed, the semi-solid resin 7 flows in the direction of the gap 9, and when it is further pressed, the upper material 11 is deformed in the direction along the concave surface 10 for forming the protrusion of the upper mold 6. Along with this, the semi-solid resin 7 also flows, conforms to the concave surface 10 of the upper mold 6, and hardens and integrates with the concave surface 10 of the upper mold 6.

Thereby, a desired shape of the protrusion 8 can be formed on the upper surface of the ski.

Other examples will be described below.

<Example> As shown in FIG. 4, the upper surface material 11 may be formed in advance into a shape that matches the concave surface 10 of the upper mold 6, or may be placed in a mold. Further, as shown in FIGS. 8 and 9, the back side of the upper surface material 11 may be lined with glass fiber reinforced plastics 15, etc., which can be optionally used.

The shape and location of the upper surface protrusion can be freely determined depending on the shape of the concave surface 10 provided on the upper mold 6, and the cross section may be chevron-shaped, arch-shaped as shown in FIG. 8, or arch-shaped as shown in FIG. 9. Although it is not shown in the drawings, it can be arbitrarily designed to have a trapezoidal shape or a combination of these, as well as the longitudinal edge of the ski upper surface material, as well as the center part and the edge and center part to protrude. It is something.

Furthermore, the present invention is not limited to skis with a sandwich structure, but can also be implemented in skis with a box structure as shown in FIG.

(Effect) The above changes the elasticity and viscosity of the ski, damping properties,
Vibration response and other factors have a large effect on skis, and the degree of freedom in design has increased significantly.As for the shape of the protrusion, semi-solid resin can take any shape, making it easy to create more complex designs. It is possible to make skis with more variations.

[Brief explanation of the drawing]

Figures 1 to 10 relate to embodiments of the present invention, with Figure 1 being an overall perspective view, and Figures 2, 8, 9, and 10 being cross sections of essential parts of completed skis. Perspective view, No. 31! I is a cross-sectional perspective view of the main part showing the state before pressing with the member placed in the mold, FIG. 4 is a partial perspective view showing another example of the top material,
FIG. 5 to FIG. 7 are explanatory cross-sectional views showing the flow state of the semi-solid resin. DESCRIPTION OF SYMBOLS 1...Ski board, 2...Lower surface component, 3...Upper surface component, 4...Center member, 5...Lower mold, 6...
... Upper mold, 7... Semi-solid resin, 8... Protrusion, 9
... air gap, lO ... concave surface, 11 ... top surface material, 12
... Edge material, 13... Sliding surface material, 14... Edge liner, 15... Glass fiber reinforced plastics, 16... Top edge, 17... Fiber reinforced plastics, 1 day...・Side material. Figure 7 Figure 2 Figure 9 //

Claims (1)

[Scope of Claims] 1. A ski in which an upper surface component protrusion is formed at a desired position in the longitudinal direction of the upper surface of the ski core member, and is integrally bonded with the upper surface component and the lower surface component, the upper surface A ski board characterized in that a semi-solid resin conforming to the shape of a protrusion for protruding an upper surface component is placed and hardened on a component. 2. The ski according to claim 1, wherein the cross section of the protrusion is chevron-shaped, arch-shaped, trapezoidal, or similar. 3. The ski according to claim 1 or 2, wherein a putty-like resin is used as the semi-solid resin. 4. Incorporate reinforcing members such as gliding surface material, edge material, edge liner, etc. into the lower mold for forming skis, and then place core material alone or a core material whose core material is covered with fiber-reinforced plastic. , Further, after placing the semi-solid resin on the core member, a top material that matches the concave surface for forming a chevron or other protrusion provided on the upper mold is placed, and a chevron or other shape is placed on top of the top material. After placing an upper mold having a concave surface for forming a protrusion,
Manufacture of a ski, characterized in that a chevron-shaped or other protruding part is formed at a desired part on the upper surface of the ski by pressing and heating to make the semi-solid resin conform to the concave surface of the upper mold and harden it. Method. 5. As a method for forming the protrusion, the semi-solid resin is placed at a desired position, a flat top material is placed, and the resin is pressed and heated using a concave upper mold for forming a chevron-shaped or other protrusion. A patent claim characterized in that the resin flows and hardens along the concave surface of the upper mold to form a desired shape, and the flat upper material is also integrated by matching with the concave surface for forming the protrusion of the upper mold. A method for manufacturing a ski according to item 4.