DE1957046A1 - Layered ski and method of making it - Google Patents

Description

The invention relates to a layered ski made of fiberglass material impregnated with synthetic resin, the particularly favorable strength and flexibility properties

as well as a particularly good ability to maintain it original shape in the rest position as well as its flexibility even after long use. Welter refers to the Invention to a new process for the production of such Ski.

A good ski creates a good balance between stiffness and elastic flexibility, at the same time in connection with other important properties in terms of weight, curvature and shape. To the weight of the To distribute the skier as evenly as possible over the entire running surface of the ski, this is with a curvature

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provided, which corresponds to a slight curve that of the The tip of the ski extends to the rear edge of the ski and, in conjunction with the stiffness of the ski, causes part of the weight of the skier is distributed towards the front towards the tips and towards the rear towards the rear edge of the ski. The extent of the bulge and the associated stiffness of the ski should be such that the shape of the two skis is uniform and, when the skier's weight is put on them, the ski itself flattens and brings a maximum part of the tread to the snow. A ski must also be stiff enough to to be able to resist a twisting moment, so that when the skier makes a turn, the edges of the ski keep their engagement with the snow instead of sliding off, but of course a certain amount of twisting is also desirable to ensure that the ski is correct Has leadership.

On the other hand, a ski should be flexible enough so that it can follow irregularities in the snow surface, without plowing through, which is the running speed of the Reduce skis and possibly result in a break in the snow. He should also be flexible, to allow the skier to make a turn or turn, since flexibility, i. do flexibility is necessary to allow a certain bending of the ski during a turn or an arc. However, it is The ski is too flexible, so it cannot run properly on hard-packed snow) or ice because of the weight of the

Skier is not sufficiently distributed over the entire running surface and the tip of the ski and the rear edge of the ski are not involved can. It is well known that the tips of very flexible skis sometimes jump or rattle while running over hard-Cr-ipacked Snow, which is a sign not only that the tips are not in the formation of the effective tread uiitv7irken, but also that of this part of the ski Little support is available when the skier is makes an arc because the edges do not cut into the snow but keep jumping while running or:; u rattle. The end result is a ski that is too flexible is not easy in the conditions of hard packed snow au steer. By the same token, a ski that is too stiff is unable to function properly under the conditions to run from soft snow, as the pushing force of the tip downwards * lets it dip into the snow and the pushing force of the trailing edge of the ski downwards difficult.

It is also important for a good ski that it retains its original shape when at rest and its flexibility even after prolonged use. Skis were as is well known, first made of wood. Hickory wood is particularly suitable for this purpose because it is its own Retains strength and flexibility longer than any other wood. The difficulty with wood is that its elasticity decreases when the wood becomes damp. It has been found that the lifespan of a wooden ski is considerable

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is limited because no amount of wax or shellac permeates the water from inside the wooden body can keep away and both the flexibility and the initial curvature with which the ski would be made, soon to be lost. The first attempt at solving this particular problem was to apply several Types of plastic on the running surface of the ski, the plastic having a very dense structure to prevent moisture from entering to prevent the tread into the wood. This eliminated the need to constantly apply wax coatings to the tread, but it could the entry of moisture into the wooden body of the ski from above or from the sides cannot be prevented. The next attempt was to cover the entire ski with a layer of plastic or fiberglass to provide, whereby the moisture could for the most part be kept away if the plastic was not peeling off or tore.

Attempts have also been made to take other types of skis Use of metal or different combinations of wood, metal and plastic layered together to use, in order to obtain the desired flexibility and the other properties mentioned. In such cases the wood was used more to give the body of the ski the desired dimensions than for flexibility and strength rather, the flexibility should be due to either

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ORIGINAL

the metal strips or the fiberglass strips are guaranteed. Attempts have also been made to manufacture skis made entirely of plastic, but these were unsatisfactory because of their weight or because of their lack of flexibility or because of manufacturing difficulties. There is a large variety of skis on the market today, almost all of which consist of layers of wood and fiberglass or wood, fiberglass and metal. In the case of layered skis which contain metal, flexibility and stiffness are dependent on the strength of the metal and the other layers do not contribute to these properties. In such cases the problem of metal fatigue becomes significant. After a relatively small number of bends, the metal loses its proper function. There is a risk of cracking and breaking, rendering the ski unusable. This is particularly problematic with metal skis that have continuous metal edges made of very hard steel. In addition, layered metal skis often have insufficient flexibility in the tips and trailing edges unless they are constructed from strips so thin that they can easily experience permanent bends. In ^one ski material with a sandwich of fiberglass and wood ■ · supplies the wood no flexibility, but only acts as a kind of spacer and the actual effect is applied only on the top and bottom, consisting of Glasfaser3toff layer. Such skis

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• tend to be somewhat on the heavy side, and In addition, if the fiberglass layer breaks, the ski loses the ingress of moisture into the wood allows its flexibility very quickly. In such skis, the shear stresses through absorbs the wood fibers, which gradually break through with use and the wood quickly softens when it is damp, is what the fibers even further impaired, so that their ability to absorb and transmit stresses will soon be lost.

Attempts have also been made to manufacture a ski entirely from fiberglass. An attempt was made to the Excessive weight problem, which was previously a hindrance to this, from the placement of hollow cores inside of the ski. However, it has not yet been possible to find a suitable structure or a suitable method develop in order to be able to manufacture such a ski industrially, since the different ones are experimentally handcrafted executed patterns were too expensive and the required alignment of the fibers can only be monitored with difficulty could be. Namely, if the fibers are not distributed linearly while the ski is being completed, it leads to a non-linear flexibility distortion or a warping the skis that are difficult, if at all, to be corrected. Another species became so-called Experimentally developed fiberglass skis that consist of three

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Dividing consisted of: an uppermost layer, a lower layer Tread and a central core made of epoxy resin, all of which are individually cut, pre-cured and then glued together became. With this special ski, both the top and bottom layers are included continuous metal strips that are practical take up part of the load in bending that the ski undergoes during use and after prolonged use fail first. In addition, gluing the layers does not create a sufficiently uniform structure, so that internal stresses arise immediately, which then have an irreversible effect on the properties of the ski.

The invention solves the various problems which can occur with a layered ski made of fiberglass, without the use of metal or wood layers, Solved solely by exploiting the strength and elasticity of the fiberglass, and it becomes a new manufacturing process indicated by which such a ski the required strength and flexibility or pliability receives. In addition, the new manufacturing process is suitable for the industrial manufacture of skis. Included • The body of the ski is pre-hardened as a single structure with no glued connections between dissimilar ones Layers of material and hardened as a whole in the desired shape, allowing better control the desired properties and this

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Properties are made permanent from the outset.

The object of the invention is to be simple and reproducible properties to indicate manufacturable skis that have particularly good strength and flexibility and durability of its properties. He should have a light weight but be strong and the for combine the flexibility required for skiing with sufficient flexibility. The original shape and the flexibility of such a fiberglass ski should be retained even after a long period of use.

It is also a new manufacturing process for such fiberglass skis are specified, which ensures the layering and shaping or pressing to form a uniform structure. Internal and external pressure should be applied at the same time will.

The main characteristic feature of a new layered ski of the type specified at the beginning consists according to the invention in that the ski has an upper and a lower one made of laminated strips of synthetic resin has impregnated fiberglass material shell, between which one extends over less than the entire length of the ski. extending central core is arranged from consists of several elongated, channel-like hollow bodies, which are partly from the tip and partly from the rear edge of the ski run out to about the middle of the ski and start there opposite sides of the ski end, front near the tip 'and rear near the trailing edge of the ski

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are closed and there are openings on both sides of the ski center have ,, which are provided with devices for closing, and that the lower shell with one on top attached tread made of plastic and with molded metal edges between the tread and the lower shell is provided, which are partially exposed along the lower side walls of the ski and made of several pieces each with a length of less than 15 cm exist.

The following is the invention with reference to the drawings for example explained in more detail.

Pig, FIG. 1 shows a side view of a ski according to FIG Invention inside the manufacturing mold, from its bottom and top plate with one side rail removed to reveal the inside of the mold.

Fig. 2 is a plan view showing further Details of the construction and shape of the new ski can be seen.

FIG. 3 is a sectional view of the ski within FIG Shape which its cross-section after hardening, but before the removal of the inner molding ^ retention device or inflatable body) shows «

Fig. 4 is an exploded perspective view Representation of the various applied layers, which illustrates their relative positions, and

Fig. 5 is an exploded perspective view View the details of the layering and construction

ORIGINAL

made clear by the ski areas.

The various parts of the mold 10 include a base plate 12 and a cover plate 14 / on of a length which practically corresponds approximately to the total length of the ski. As shown in Fig. 1, the bottom plate 12 is bent upwards in the center at 13 to an extent sufficient to give a shaped ski the desired curvature. At the rear edge of the ski, the plate 12 is inclined slightly upwards at Io in order to form a slightly raised rear edge of the ski. The .Ski tip is bent as usual and the lower plate 12 is accordingly also curved upwards at l8. The cover plate 14 is also inclined at its rear end at 20 up slightly and she also has a curved tip 22. As shown in FIG.> Shows, the · disc lK consists of an actual cover plate 2k and a fixed projection associated with it, down Part 26, which fits between the rails 28 »

In Fig. 2, the remaining parts of the mold 10 are shown, which include four side rails 28, which with the lower plate 12 by screws 29 or similar fasteners are connected. The rare rails 28 are sufficient long to extend over the part of the ski in which its lateral flanks are straight and parallel. As can be seen from Fig. 2, the contours of the ski rear edge and the ski tip begin to be curved near the ends to run inward. Accordingly, separable -

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Side panels 30 for the trailing edge on panel 12 fastened by several screws j) l. The side plates JO each form one half of the / side of the ski rear edge and are along the center line of the mold 10 separated at 32 so that after shaping the ski, these parts are easily removed can be so that de.] "ski without damaging his Shaped body. ', Can be removed.

The side pieces ~ *> K are attached to the plate 12 by screws 35 to DEI HlUspitze, and so that it can be taken away from the molded ski also separated at 36 to the extreme end of the ski for the purpose of H-oraUis-acceptance. A perspective view of this part of the mold can be seen even more clearly in FIG.

On either side of the mold near its center are two holding blocks 38 for inflatable bodies in alignment with the side sehiei) on, 28 attached. On the holding blocks 38 are a plurality of elongated pressure pads 40 attached, the by the arrangement and design of the holding blocks 38 be held so that they are at an angle into the Inside the mold extend into and are curved so that they are parallel within the mold 10 in the longitudinal direction run to the iJeitensohienen 28. The drawing shows two groups of four pressure pads each, but this is only one example from which the number of pressure pads also differ can vary depending on the ratio between the height and width of the layered structure and the desired number of

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Hollow cells. The pressure cushions 40 extend into an end block which has a plurality of nozzles 44 protruding therefrom, which in turn are received by a distributor piece 46. The manifold 46 has an inlet 48 which can be connected to a pressure source of a medium such as steam or air. The pressure pads 4o and consequently also the holding blocks 38 are arranged so that the pads 40 can enter the interior of the mold 10 at a point near the center of the ski, since this is the part of the ski which is thickest and therefore the introduction of a special reinforcement material made it possible to avoid any weakening of the structure which could be caused by the irregularity of the cell structure at this point. In addition, the central part requires the ski, on which normally the place is where the ski is secured to the foot of the skier, the lowest degree of flexibility and therefore it experiences in ^7v this regard, the lowest loading.

In Fig. 4 further details of the mold structure can be seen. The lower plate 12 is rounded with a Longitudinal rib 50 provided, practically over their whole Length extends and the rounded guide groove on the The underside of the shaped ski is usually there is provided and improves its leadership properties. Other types of ribs can of course also be provided to create other groove formations if this be desired. Length of the crazy uken of the

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Side rails 28 are provided with slots 52 which serve to receive the metal edges 56 * and use them during the processes of assembly and hardening in place and Place to hold. .

To form the lower shell of the ski, the first piece of sheet material that is placed in the mold 10 is a strip of plastic material 5 ² I- of a type that has very low porosity and a very low coefficient of friction, such as for Example a high molecular weight polypropylene. A suitable material of this type is commercially available under one of the brand names CYTEX or P-TEX. Such materials are already in use for this purpose in the manufacture of skis. The strip 54 forms the running surface and is cut according to the general outline of the ski shown in FIG. Once the tread 54 is in place, the metal edges 56 are inserted into the slots 52. The metal edges 56 suitably consist of sections of hardened steel, which are preferably not more than 15 cm long and have an L-shaped cross-section, such that the longer leg of the L overlaps the edge of the strip forming the tread, while the short, thicker leg the L-shape forms the part of the metal edge that protrudes outwards. By inserting the metal edges 56 into the slots 52, the ski. provided with protruding metal edges that protrude slightly over its flanks on the sides. The short sections of the

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Metal edges 5β are arranged end to end approximately over the entire length of the ski, including a short piece of the ski tip, before it has a considerable curvature in plan. The short sections allow or; the ski to bend freely, as it corresponds to the flexibility of the fiberglass materi as, without significantly changing its -ilapping properties. The sections should not be larger than about 15 cm, preferably about 2.5 to 7 * 5 cm long. Ss, sections with different lengths can also be added / ended. The short Toilstreifen are more expensive and require more Z "it for dr n structure, making the longer the ski stiff or. To take diez \ η circumstances into account, it can '/ oi'tfulhaft SMN, near the tip and the ski rear canoe · kür - '.? ro sections to be used if a larger FL - :: -; ib: ili t ^: l is desired there.

The next layer consists of a strip Sb 'which was previously folded into the shape of a channel /, e ·; so that the floor is about the width of the üki; nt and the sidewalls of the tapered contour of the jeiton walls of the ski, as shown in Fig. 1, follow. The -! R.x'ei i'on -.o consists of woven glass fiber material in which the "fibers run in two directions, i.e. run in two directions approximately the same number of fibers in the longitudinal direction of the ski and in its transverse direction. The material the layer 58 is preferably impregnated with an uncured resin and is in a dry place

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State. The U-shaped strip 58 is followed by the next layering, consisting of several flat strips 60, which are also the same as in Pig. 2 shown outline of the 3kl are cut accordingly. The strips 6c are a fiberglass material in which the fibers are oriented in only one direction, namely in the longitudinal direction of the ski. The strands of strip 60 are adequately held together by occasional, spaced transverse fibers. The strips βθ are also previously impregnated with a dry, uncured resin. The number of strips βθ can vary depending on the degree of flexibility desired for the ski. The drawing shows four such strips in FIG. 4, but this is also only an example and the invention is not restricted to this. Depending on whether greater or lesser flexibility is desired, for example if something is desired in the area of the ski behind the edge than in the tip, special stripes : can be added to various positions; ^; or it can <U ± strip W. gestures staggered in the longitudinal direction, so that a uniform taper to the tip ■ located>'he j trailing edge results in there, but also can also be a:;' -: n uniformly changing flexibility can be obtained.

In cases where additional resistance to the twisting minerite is desired for certain parts of the ski; 3t, can 'V- rub 60 with a uniform direction in

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Neighborhood to the strips 60 are inserted, the stripes running in one direction at an angle to Ski longitudinal axis are directed. The strips 60 complete the structure of the lower shell.

Next, a central core is molded around the separate the lower and upper shell from each other. This Core comprises several elongated channel-like parts., - The were previously brought into a U-shape by folding. The channel-like parts 62 are first directly on the Strip 60 placed with the open side of the channel facing up. These channel-like parts 62 do not extend over the entire length of the ski, but only about the length of the side rails 28. In Pig. 2 are the channel-like parts in dashed lines, following the curved contour of the pressure pad 40 and near the central part of the Ski endendj shown where the pressure pad 40 from exit the side walls of the ski. In Pig. 1 shows the side wall of a finished ski where the pressure pad 40 comes from step out of the sidewalls of the ski. The side walls of the channel-like parts 62 and 64 can also be seen here. the Upper parts of the channel-like parts 64 are arranged with their open sides down, so that the side walls are those of the channel-like parts 62 slidingly touch. Before the parts 64 are so arranged, the pressure pads inserted and each is inserted into one of the channel-like parts. Because the thickness of the ski is variable and according to the.

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Decreases towards the tips and trailing edges, it is necessary to that the side walls of the channel-like parts 62 and 64 taper towards their ends. This taper is in Pig. 4 denoted by 65. The channel-like parts 62, 64 are made of fiberglass material with two fiber directions, which is impregnated with uncured resin, as is the case with the other materials used here Fall is and they are dry. The channels have previously been folded with the aid of a hot press device.

Once the pressure pads 40 and channel-like members 62 and 64 are in place, they become different Side strips 66 inserted, which extend until where the ski trailing edge and the ski tip begin and the. therefore, as previously described, are beveled. Since the pressure pads 40 emerge near the center of the ski, the side strips 66 are just long enough that they are extend from the point designated by 67 in FIG. 2 to approximately the point designated by the number 68. So there are four separate groups of these hard shoulders. The. Strips 66 are placed between the outer edges, of the channel parts 62, 64 and the side walls of the U-shaped Strip 58 inserted.

The top shell is now made in a similar fashion to that shaped lower shell. The first layer is a second one Group of fiberglass strips 70 with a fiber direction i as well as the strips 60 having a pass direction,

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and are cut to the shape of the finished ski and impregnated with uncured resin. It is also possible for strips 70 to be staggered in length or, if necessary, some of them can also be placed at an angle. After this is done, a second large strip J2, designed as a U-shaped channel, is lived into the mold. The strip 72 is approximately the same as the strip 58 in that it consists of fiberglass material with two Paserrichtun ^ en and is previously impregnated with uncured resin. The side walls of the strip 72 can be disposed either inside or on the outside of the side walls of the strip 58. The end layer is a further U-shaped ^{material inserted as a cover layer 1} Jk , the side walls of which extend outside the side walls of the large U-shaped strips 72 or 58. The cover layer ^ K is preferably a fine-meshed fabric with two grain directions, for example a mat made of DACRON (trade mark), which is also previously impregnated with an uncured resin. The top ^{layer 1} JH- should primarily serve the decorative appearance and can be colored or printed if desired. The strips 70, 72 and 7 ^ together form the upper shell of the ski.

In Fig. 5 'the various layers of the pointed section of a ski shown pulled apart. The same types and order of the Stratifications are applied to the rear edge of the ski, so that a special representation is unnecessary for this. the

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Layers, which form the upper and lower shell, extend, as already mentioned, into the tip of the ski. This shows the tread 5 ^, but its sides are trimmed at so that they match the last part of the edges. The first large U-shaped strip 58 with two fiber directions extends into the actual ski tip, and in order to allow the material to be curved upwards, the sides are trimmed or grooved, as shown at 59 ¹ . The first group of strips 60 with only one gripping direction is also shown as extending directly above the strip 58 and into the ski tip. '''" ■■ ■ ■ ■■"

Since the U-shaped channels 62 and 64 do not extend all the way to the tip or to the rear edge of the ski, "it is necessary to provide a certain distance between the upper and lower" halves ", as is the case with the channels;. in d'Sn-Iload happens the ski "· For this purpose, a plurality of strips ■ ^j.'üo; 'Ge ViVbe mlt two ■ Paserriohtungen or Padenrichtungen; oil between strips 60 und'70 that ■ have only one fiber direction? , ^ r- lays. These strips "76. can be cut in such a way that they result in a central cavity 78 which is filled with a mixture 80 which consists of an uncured resin compound to which a filler of small hollow spherical elements 82 is added. After curing, this material imparts the tip of the ski has considerable strength, maintaining its solid shape, but not excess

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O ORIGINAL BATHROOM -

Causes weight in the top. .........

Above the strips J6 in the tip and of the core material 80, the strips 70 of material with one fiber direction run up to the tip itself, and above the strips 70 there is the strip 72 with two fiber directions and the strip forming the cover layer. 7 ^ ·· As mentioned, their edges can be trimmed or grooved, as shown at 75, to allow the U-shaped strips 72 and 74 to curve upward. To further protect the tip from damage and stiffen the curved portion of it, a metal tip piece 84 may be placed in the mold along the sides of the tip so that it extends along the outer sidewalls of the cover sheet 74 and when the resin is hardened, adheres to it and is made in one piece with the ski.

The process steps in the manufacture of a ski according to the invention include, above all, the assembly and the insertion of the various layers, as already described. With all of the layers and pressure pads 40 in place, the top plate 14 of the mold is placed on top of the lay-up and arranged so that the middle portion 26 fits between the side rails 28 and is directly on top. the top layer Jk-. rests. The entire arrangement is then placed in a press. Which has an upper and a lower pressing surface © which is somewhat. correspond to the upper and lower surfaces of plates-12 and I ^ .. Then the pressure inlet ports. 48 connected to a steam pder compressed air source. The outer panels

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The outer press are then operated to simultaneously pressurize the outer layers, the pressure pads are pressurized and can be heated somewhat, if steam is used, until the resin softens and something begins to flow. The panels of the. outer molds are also heated until the plastic is soft, and this state is maintained until all of the uncured resin has become soft and easy to flow. When the outer press is pressurized, the pressure on the inner pressure pads 40 is interrupted for a short period of time and then reapplied to allow a significant amount of the trapped air to escape between the various layers. The pressure within the pads 40 is then increased until the soft resin begins to emerge from the cracks in the mold, indicating that all of the resin has melted. The pressure on the inner pads is then increased to about - at (125 lbs. Per square inch) and the temperature on the outer plates to 150 to 15.5. C. "(500-330 degrees Fahrenheit). The entire assembly is then left at these temperature and pressure values for hardening for about 30 minutes The upper plate 14 is then removed and the side rails 28, 30 and y \ separated from the lower plate 12 and the pressure pads 40 are removed from the interior of the channels 62, 64.

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pulled so that the ski can be removed from the mold can. The ski is then ready for sandblasting cleaning and surface finishing, and the edges 56 can be ground and also finally processed.

During the operation of the action of heat and pressure, after the resin has become liquid, the expansion of the tubular pressure pad 40 against the adjacent side and bottom walls of the channels 62, 64 causes these channels to initially adhere to one another and when the pressure pad 40 expands further move vertically and try to slide in ■ this plane. Since the initial pressure against these sidewalls compresses them and the heat on the uncured resin causes them to adhere to one another, the final application of. Pressure on the cushions under a / ¹ bias as they try to slide away the filaments in the sidewalls, and in that state they are allowed to set. A maximum structural strength is created by fibers which are under pre-tension, since they are the first to bear any tension load and, in the same way, are the first to hit the pressure loads. As a result of the fact that these strands are placed under a pretension if they are not to experience any pressure load, the amount of load they can withstand becomes significantly greater than if these strands were not strengthened by pretension, but only kinked or folded ,

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in which case they would fail much more easily under load.

The strips 60 and TO, which have only one fiber direction, also experience certain changes during the pressing process. Since a number of gaps or spaces between the adjacent channels and · the various other layers are present within the ski itself, the initial pressure caused by the pressure pad, that the ä fibers βθ with only one fiber direction in the strip and 70 to condense and Filling gaps so that they form strips in which the fibers are oriented lengthways, among other things? result in maximum strength. As a result of the fitting process, the entire internal arrangement of the stratification becomes a unitary body with a solid structure of great internal adhesion in the desired shape without internal stresses. Fig. 3 shows this one-piece structure and illustrates the state of the interior of the mold following

the hardening ^ curtain and before the removal of the pressure from the ^ Inside the pressure pad 40, after the ski has been removed, a narrow strip of plastic material (not shown) are glued over the openings 86, which are in the

Sides of the ski remain. ■ '

The possibilities for using and carrying out the invention are not limited to those described here and details shown, which are only intended to explain the "principle" of the invention.

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Claims (1)

1857046 αν Claims Layered ski made of fiberglass material impregnated with synthetic resin, characterized in that it has an upper and a lower shell consisting of stacked strips of fiberglass material impregnated with synthetic resin, between which a shell extends over less than the entire length of the ski. extending central core is disposed, said elongated from a plurality of channel-like hollow bodies is that extend partly from the top and partly on the trailing edge of the ski out to about the middle of the ski, and terminate there on opposite sides of the ski, the front near the tip and the rear near the rear edge of the ski are closed and have openings on both sides of the ski center, which are provided with devices for closing, and that the lower shell with a tread made of plastic and molded between the tread and the lower shell Metal edges are provided, which are partially exposed along the lower side walls of the ski and consist of several parts, each less than 15 cm in length. 2. Layered ski according to claim 1, characterized in that the side walls of the channel-like hollow body adhere to each other and their fibers are biased in the vertical plane. 3, layered ski according to claim 1, characterized 109821 / 0d99 .JAtt & fcÖ OAtttfr ORIGINAL characterized in that the upper and the lower shell each consist of several strips of fiberglass material, part of which is of a type in which virtually all of the fibers run in the longitudinal direction of the ski. 4. Layered ski according to claim J5, characterized in that that the remaining strips of fiberglass material are of a type in which the pasers are approximately uniform run in the longitudinal direction and in the lateral direction of the ski. 5 Layered ski according to claim 1, characterized in that that the trailing edge and the tip of the ski contain several strips of fiberglass material impregnated with synthetic resin, interposed between the upper and lower Shell are arranged and from the core ends to the respective the outermost end of the ski, whose outer contours run accordingly the shape of the rear edge and the tip "of the ski are tailored and the one central open. Have area which forms a cavity which is filled with a liquid synthetic resin combined with a filler. 6. A method for producing a ski according to one of the AruprU'ihe 1 to 5, characterized in that several Fiberglass stripes impregnated with synthetic resin be placed in a mold to form an upper and a lower shell, between which a central core eye- is brought, which has several elongated hollow cells, in which a stretchable device for producing a 1098 21/0909 original 257046 Internal pressure is introduced, dsS at the same time heat as well internal and external print on Iia impregnated with synthetic resin Strips are applied 30 that the glass fibers at the beginning the curing of the synthetic resin crosslinked in a stress state; that gut -.las Kunsbh.u-z hardened in dan strips so that a uniform structure is created, and that finally the -hiiiunre device for generating a Internal fructures are removed from the hollow cells again. 7. The method according to claim 5, characterized in each case, that to form the rear edge of the ski and the ski point, additional strips of impregnated fiberglass material inserted between the upper and lower shell // ground, and that a central cavity in this strip provided and with a mixture of a synthetic resin and a filler is filled. 8. The method according to claim Y, characterized in that a plastic tread is applied to the outer bottom surface of the lower shell and a plurality of metal edges consisting of separate pieces are inserted between the tread and the lower shell, so that a part of this along the side walls of the ski outside introduces. 9. The method according to claim 6 or 3, characterized in that that practically all fibers Ln part of the stripe eil In the upper and in the lower S j ha Le parallel aligned with the longitudinal direction of the Slci. 10. The method according to claim 6, characterized in that 10982Ί / 0999 that several resin-impregnated strips along both sides the upper and lower shell and the central core to be ordered. 11. A method for producing a ski according to one of the Claims 1 to 5, characterized in that several resin-impregnated glass fiber strips are arranged in a mold to form a lower shell by folding some fiberglass strips so that they form a central Form core with several elongated hollow cells, whereupon several resin-impregnated glass fiber strips to form the are placed in the upper shell, an expandable device maintaining the internal pressure is inserted into the hollow cells and the Form is closed, after which the. Form warms And the Pressure holding device is pressurized so that a pretensioning is exerted on the glass fibers when the resin begins to harden, after which the resin is hardened, so that a one-piece structure is created and the pressure retaining device is removed from the hollow cells again. 12. A method for manufacturing a ski according to one of claims 1 to 5 * _t characterized in that at first one of the shape of the finished ski is prepared corresponding shape been whereupon a plurality of dry resin-impregnated glass fiber strips inserted to form the lower shell in it, that then a plurality of dry resin-impregnated fiberglass strips are shaped into elongated channels and placed on the lower shell in the mold, several dry- 109821 / Q9Ö9 BADORLGiNAL 196 7 resin-impregnated glass fiber strips to form the upper Ichale placed in the mold and elongated pressure holding devices are introduced into the channels, whereupon the Form heated and at the same time external pressure exerted on it and internal pressure on the elongated pressure holding devices is exercised, after which the resin is cured to produce a uniform structure, and the Pressure holding devices removed from the channels vi ground. 13. The method according to claim 12, characterized in that that the channels previously obtained by folding an approximately rectangular cross-section and in a cross-sectional pattern which the Kanalqi incisions partly above partly below lying interlocked, arranged so that elongated Hollow cells are created 14. The method according to claim 13, characterized in that that the application of the pressure holding device with internal Pressure is applied after the application of heat and external pressure at a time when the resin has become sticky. 15 «The method according to claim 13, characterized in that that several openings on the sides of the mold close by provided from the center and the channel-like hollow body bent to the side approximately in the middle of the mold so that their cores coincide with the openings, that the pressure holding devices through the openings in the Sidewalls of the mold are introduced - so that the channels 10 9 8 2 1/0999 and the pressure holding devices in the vicinity of the ' Are curved in the center of the mold and extend longitudinally from the center of the mold towards the ends thereof. 16. The method according to claim 15. » characterized in that subsequent to the removal of the pressure holding device from the channels, the openings remaining in the side walls of the ski are covered by the removal of the pressure holding device. ' \ 109821/0999 CiAS 3ο Blank page