DE2332909A1 - HOLLOW SKI WITH A GLASS FIBER REINFORCED PLASTIC CORE - Google Patents

Description

I Our Zaichan please angaban

Dr. E. Wetzel j 25/6 (258/73)

Dipl.-Ing. E. Tergau

Patent attorneys Nuremberg, June 26th, 1973

Nippon Gakki Seizo Kabushiki Kaisha, Nakazawa-cho » Hamamatsu-shi, Shizuoka-ken, Japan

Hollow ski with a glass fiber reinforced plastic core

The invention relates to an improved hollow ski with glass fiber reinforced plastic core with excellent Strength and high performance.

Because of the growing popularity of winter sports, such as skiing, the production of skis has risen sharply. The processes for making such skies have improved significantly. This is particularly the case with the Manufacture of hollow skis from plastic. However, several inconveniences remain unsolved in the conventional plastic ski remained. In the usual known core material of hollow plastic skis with glass fibers, they are used for reinforcement Serving glass fibers arranged only in the longitudinal direction of the ski, so that the core material itself is at risk of breaking is exposed. Because of the cross-sectional structure, the adhesive bond between the parts of the core material part lengthways. As a result, desired strength and durability are never desired has been achieved with the usual production method.

309882/0684

The object of the present invention is to eliminate the disadvantages mentioned above.

Another object of the invention is to provide a new and improved ski with a hollow core body is provided, which ensures excellent strength and lasting performance. Another object of the invention is the creation of an improved ski with an upper and a lower core part, each of which at least has a U-shaped channel, the upper and the lower core portions are brought into engagement to form a cavity or cavities therebetween.

According to these objectives, the hollow ski according to the invention is characterized in that it is provided with a hollow core body consisting of an upper core part and a lower core part, both being made of glass fiber reinforced plastic and each core part consisting of a horizontal part _{T of} the d » n is arranged in the longitudinal direction of the ski, and two or more leg parts which are vertically and integrally attached to the horizontal part, and further in that the reinforcing glass fibers in each core part are arranged in the longitudinal direction of the ski in a manner that the Glass fibers run continuously substantially from one leg part through the horizontal part to the other leg part in order to give the ski excellent durability.

309882/0684

For a better understanding of the invention, this should be different further training explained on the basis of the drawings. Show it:

Fig.l shows a cross section of a conventional core body for a ski,

2 shows a partial cross section in a perspective view a ski according to the invention,

Fig.3-7 cross sections of the core part according to the invention in different shapes,

FIG. 8 is a cross-sectional view of a material arrangement in FIG a mold cavity for the production of the upper ski assembly,

Figure 9 is a cross-sectional view of an arrangement of material in a mold cavity for the production of the lower assembly of the ski,

10 shows a partial cross-section in perspective View showing the final attachment of the upper assembly and the lower assembly. coincidence.

First, the usual core material for a ski is shown in Fig.l, in which the core 10 has a lower core part 10a and includes an upper core portion 10b, both of which extend substantially the length of the ski. The upper core part 10b consists of a horizontal part and leg parts that extend downward from the horizontal part. The parts

10a and 10b are made of fiber-reinforced plastic, for example manufactured and connected to each other by an adhesive. A tread plate, barrel Edges, side panels and top decorative panel are attached to the surfaces of the core 10 by an adhesive. the Glass fibers in parts 10a and 10b are arranged so that they run only in the longitudinal direction of the ski. The usual one Plastic skis with the structure just mentioned do not result the sufficient adhesive connection between the two parts 10a and 10b. The glued part can separate if a great tension is exerted on the ski body. In addition, because the reinforced glass fibers in the core material only in the longitudinal direction of the ski, the core material 10 can be at the joints of the horizontal parts of the upper core part 10b break, especially when shear forces occur.

In the ski according to the invention, the disadvantages mentioned are eliminated. One view, partially broken away, is shown in Fig.2. The reference number 1 denotes the running plate, which is provided with running edges 2 on both longitudinal sides is. A lower plate 3 is laid in layers on the tread plate 1. The core part is on the plate 3 10 placed: side surface plates 4 are on both sides of the Core plate 10 attached. A top plate 5 and a decorative

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ration plate 6 are applied to the surface of the core 10 in layers.

With this structure, the characteristic advantage of the invention resides in the construction of the structure of the core 10. The Core 10 comprises a lower core part 10a with an upper concave part and an upper core part 10b with a lower concave part, the part 10b being received in the concave part of the part 10a. How in detail Fig.3 can be seen, the lower core part 10a has a horizontal part 11a and two leg parts 12a, the extend upward from the side edges of the horizontal part 11a. The parts 11a and 12a define a concave one Part between themselves.

In the same way, the upper core part 10b has a horizontal part 11b and two leg parts 12b, which extend from the Side edges of part 11b extend downward. The parts 11b and 12b define the concave part between them. The lower Core part 10a, in particular its leg parts 12, are received in the concave part of the upper core part lObj, wherein the leg parts 12a are engaged with the leg parts 12b to between the core parts 10a and 10b to make a cavity. The upper and lower core parts 10a and 10b are made of glass fiber reinforced plastic. Fiberglass rovings with continuous threads can be used to accommodate the glass fibers in the core parts. The glass fibers are in the core parts 10a and 10a

ORIGINAL INSPECTED

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10b arranged so that they are in the longitudinal direction of the ski extend as indicated in FIGS. 2 and 3 by the reference number 1 and also in the transverse direction of the ski as indicated by the reference character t.

Particular attention should be paid to the fact that each thread or glass fiber t is continuous from a leg part 12a or 12b through the horizontal part 11a or 11b extends to the other leg part 12a or 12b of each core part 10a and 10b, the connections between the horizontal leg parts 11a and 12a or 11b and 12b are reinforced in particular by the glass fibers t, which run continuously at these connections.

In the embodiment of Figure 4 are the middle parts lob in cross section of the upper core part and the lower core part 10a reinforced by a support piece 13, whereby the supported middle part can be saved from the weight of the user or other forces during sink into use. In this case, the leg parts 12b of the upper core part 10b are in the concave part of the added lower core part 10a.

In the embodiment shown in Figure 5, the middle one Part of the upper core part 10b integral with the other leg part 12b in the same way as the above Leg parts praise connected. In this case, every fa-

303882/0684

ün'S-MAL IMSF ⁹ ECTED

the or each fiber of the glass fibers t extending substantially from a leg portion 12b through half of the horizontal part 11b to leg part 12b. In addition, in this embodiment, the leg parts are 12a and 12b Shaped like an edge in order to be glued together smoothly and to facilitate the shaping of the core parts.

In the further embodiment according to FIG. 6, two unions of the lower core parts 10a and the upper core parts 10b are arranged side by side, with a support piece 13 being fastened between them. The embodiment according to FIG. 7 is provided with a two-layer leg part 12a between the first horizontal part 11a and a second horizontal part II ¹ a of the lower core part 10a, in which each thread or each fiber of the reinforcing glass fiber t continuously from a leg part 12a of the lower core part 10a runs through the first horizontal part 11a, the double-layered leg part 12'a and the second horizontal part 11a of the other leg part 12a. This lower core part 10a is formed with two concave recesses to receive two upper core parts 10b.

As stated above, the ski core according to the invention is reinforced to a sufficient degree because a plurality U-shaped channel members are engaged with each other to form a hollow core of rectangular cross-section,

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ORiGlNAt INSPECTED

and further because the glass fibers in each core member are arranged to be continuous through the U-shaped cross-section of each core part. As a result, the ski according to the invention is resistant to shear force and is particularly beneficial for heavy use of the ski. In addition, the hollow part or parts lead beneficial to a reduction in ski weight within the core links. As a result, a stable ski be made with light weight according to the invention.

With reference to FIGS. 8 to 10, the method is now intended to be effective Structure of a ski with a core member according to the invention will be explained.

As FIG. 8 shows, the cavity 16 becomes a lower mold 14 with a non-hardened or only partially hardened or only partially hardened glass fiber reinforced plastic (hereinafter referred to as FRP) which constitutes the upper core part 10b. The glass fibers that are in this material are included, extend in different directions and that steadily between the horizontal part 11b and the Leg parts 12b. Then a top plate 5 and a top plate 6 are laid in layers on the FRP material. The cavity 16 in the lower mold 14 is then closed by an upper mold 15. The FRP material is made by Cured by heat and pressure, the upper core member 10b being tightly adhered to the upper plates 5 and 6.

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OFHGtNAL INSPECTED

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In the meantime, as FIG. 9 shows, the cavity 19 another lower mold 17 filled by the lower links, i.e. a running plate 1, running edges 2, a lower one Plate 3 and side face plates 4 are on the inner surfaces the cavity 19 arranged side by side. Then FRP material is put into the cavity 19 of the mold 17, and the opening is closed by the upper mold plate 18 to establish a connection under heat and pressure. Here these said parts and materials are tightly bonded together to form the lower part of a ski. The selection of the FRP material and the curing conditions as well as the adhesion of the other parts can be carried out according to the usual molding technique for plastics.

The upper and lower assemblies made by those described above Processes are then bonded together by a suitable adhesive to form a Manufacture skis according to Fig. 10.

As stated above, the upper assembly and the lower assembly are molded separately. Each of them is provided with a glass fiber reinforced plastic core part. The core parts themselves have great strength because of the arrangement of the reinforcing glass fibers. Additionally for this purpose, the formation of the core parts is designed so that they have great strength and good adhesive characteristics

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OFMGiNAL HMSPECTED

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result. Therefore, when the core members are adhered to each other, an excellent, durable, but light ski body formed by a relatively simple process.

It should be emphasized that the specific embodiments just described are merely illustrative of the invention are intended to represent and in no way limit them.

OFHGlNAL INSPECTED

Claims (8)

Patent claims: lJ ski, characterized in that it has a first core member and a second core member comprising each core member made of fiber reinforced plastic and one horizontal part and two leg parts which extend from one side of the horizontal part that the horizontal part and the leg parts define a cavity between them that one of the first and second Core member is received in the cavity of the other of the first and second core members, at least one of which the leg portions of the first and second core members abut the other, further characterized in that the Fibers steadily essentially from one leg part over the horizontal part to the other leg part get lost. 2. Ski according to claim 1, characterized in that one of the leg parts of the first core member rests on the leg part of the second core member, and that the other leg portion of the first core member abuts the other Leg portion of the second core member. 3. Ski according to claim 1, characterized in that it additionally contains a support member which is in the hollow space is attached, which is formed by the first and second core member, with the support member between the horizontal Parts of the first and second core members extends. 4. Ski according to claim 1, characterized in that the first core member has a further leg part which extending from one side of the horizontal part of the first core member and this further leg part and the other pair of leg parts have a further cavity therebetween, this further leg part from There is plastic with reinforcing glass fibers, which is essentially from the further leg part over the horizontal Pass through part of the other pair of leg parts. 5. Ski according to claim 4, characterized in that one the pair of leg parts of the first core member3 rests against the other of the pair of leg parts of the second core member, wherein the further leg of the first core member abuts the other pair of leg portions of the second Core member. 6. Ski according to claim 1, characterized in that it contains a third and fourth core member made of glass fiber reinforced Are made of plastic and have a horizontal part and two leg parts that extend from one Side of the horizontal part of the third and fourth core member extend that the horizontal part of the leg part of the third and fourth core member has a cavity between them that one of the third and fourth Core member is received in the cavity of the other third and fourth core member, the legs of the third 3 0 h - ^c ? ? / 0 β 1? 4th and fourth core member are in contact with each other that the fibers of the third and fourth core member steadily from one to the other leg part of the third and fourth Core member over the horizontal parts of the third and fourth core member to the other leg part of the third and fourth core members extend with the third and fourth core members side by side with respect to the first and fourth core members second core member are arranged. 7. Ski according to claim 6, characterized in that a further support member is provided and that the third and fourth core member are connected to the first and second core members via this support member. 8. Ski according to claim 6, characterized in that one of the leg parts of the first and second core member is insoluble is connected to the leg portion of the third and fourth core member to form a two-layer leg portion with the fibers in the other of the first and second core members along the fibers in the other of the third and fourth core link run. 3 0 ⁽ ä P 3 2/0 β ^ / ^ Blank page