EP2353670B1 - Snowglide board - Google Patents

Description

The present invention relates to snow gliding boards, such as skis or snowboards, which are mainly used as winter sports equipment. It relates to snow sliding boards according to the preamble of independent claim 1.

Schwegleibretter are out for example EP 0 328 439 . EP 0 340 211 . WO 9305853 . WO 2004067118 and WO 2006069706 known.

The demands made on the handling characteristics of skis and snowboards have increased enormously in recent years in the area of recreational sports. The drivers require the sports equipment to be widely used for a wide variety of driving situations, speeds, types of snow, weather and piste conditions and driving styles. Various skis and snowboards are known from the prior art in which an attempt is made to increase the torsional stiffness or to reduce the torsional deformation of the ski or of the snowboard about the longitudinal axis. This is intended to improve the power transmission between the binding - as an interface between ski boot and ski - and the ski edge. At the same time, by means of various measures, the bending stiffness of the skis is also to be increased in order to achieve better control stability, above all at high speeds. These stiffening measures of the snow gliding boards are usually at the expense of the damping properties of the skis, which negatively affect the smoothness of the sliding boards. In order to meet all requirements, it is therefore usually attempted to achieve suitable damping and deformation properties by means of complex internal and / or external structures and a wide variety of material combinations.

Not only does this add weight to skis and manufacturing costs, it also inevitably requires compromises in product characteristics. In addition, the thus optimized skis and snowboards are increasingly difficult, which is rated by the athlete and thus the potential buyer very negative. It is therefore the object of the present invention to provide snow gliding boards, in particular skis and snowboards, of the type mentioned in which torsional stiffness, bending elasticity and other characteristics can be changed, but which are at the same time easily and efficiently produced by an extremely simple construction.

According to the invention, this object is achieved in that the snow sliding board comprises a supporting sole which has a thickness of at least 0.5 mm and consists of a composite material of continuous fibers embedded in a thermoplastic material. Preferably, the sole extends over the entire width of the snowboard. The sole may form the sliding surface or be coated with a thin sliding coating, as is known from the prior art.

According to preferred embodiments, the continuous fibers in the sole are present as unidirectional continuous fibers, scrims of fiber bundles, fabrics, fabrics of fiber bundles and combinations thereof.

Preferably, in the inventive snow gliding boards, the soles are formed by a laminate of a plurality of fiber layers, wherein the orientation of the fibers in the laminate relative to the longitudinal axis of the snow gliding board is anisotropic or quasi-isotropic. In the quasi-isotropic laminates, the fibers are oriented in the following directions with respect to the longitudinal axis of the snowboard: 0 °, + 45 °, 90 °, -45 °. In the anisotropic laminates, however, the fibers are oriented in the following directions with respect to the longitudinal axis of the snowboard: 30 °, -10 °, 50 °, -60 °.

It has proven to be advantageous to arrange the fibers in the individual fiber layers in each case unidirectionally aligned. In production, this is facilitated by the use of prefabricated strips or sheets in which a fiber layer is already embedded in the thermoplastic.

The direction of the fibers in adjacent fiber layers preferably changes relative to one another.

Thermoplastics are preferably used for the production of the snow sliding boards according to the invention, which are selected from the group: high density polyethylene (HDPE), polyamide (PA), polyphenylene sulfide (PPS), polyethyleneimine (PEI), polyetherketone (PEKK) or polyetheretherketone (PEEK) , The preferably used continuous fibers are selected from the group: carbon fibers, basalt fibers, aramid fibers, glass fibers or steel fibers. The combination of polyether ketone (PEEK) and carbon fibers has proven to be an extremely efficient combination of materials. Despite the relatively high price of these materials, especially the polyether ketone, this combination is particularly preferred because it opens up completely new ways by their excellent mechanical properties in the lightweight construction of snowboard.

It has proved to be advantageous to connect the intrinsically stable sole of the snow gliding boards according to the invention to the edges and / or a core and a top chord / or a top layer in a material-tight manner, preferably by means of a meltable adhesive. The adhesive is preferably a thermoplastic that can be melted at a temperature that is below the softening temperature of the thermoplastic in the composite.

In further embodiments of the present invention, the high stability of the sole is used to positively and / or non-positively connect the correspondingly shaped sole with a core and / or a top flange / or a top layer. Thus, for example, a tongue and groove joint between sole and core and / or upper flange, which extends substantially over the entire length of the Schneegleitbretts be used to connect the individual components together. This type of connection allows the sole and the core and / or upper belt to be relatively movable relative to each other. Designated When the sole and the top chord are used as chassis, the mobility in the axial direction allows the core to slide in relation to the chassis, as a result of which the damping properties can be purposefully influenced and improved. Corresponding locking means prevent the mated components from disengaging when using the snowboard. Alternatively, the components can also be locally adhesively bonded or welded together. This combination of components allows Schneegleitbretter, for example, produce skis, where the entire surface can be easily replaced. Even when interchangeable coating, the edges are preferably glued to the sole.

According to further preferred embodiments, the snow gliding boards are made in one piece from a sole, which has only edges attached to both sides, a thin tread covering and means for attaching bonds. The novel material combination according to the invention makes it possible to produce a ski or a snowboard which consists, as it were, monolithically of the composite material of continuous fibers embedded in a thermoplastic material. The orientation of the fibers in the thermoplastic material allows the properties of the ski or the snowboard to be adjusted so that - as already described above - both the stability and the damping properties meet the highest demands.

The targeted attachment of recesses in the inventive snow gliding boards, at least in the soles, on the one hand can reduce the weight, on the other hand, the mechanical-physical properties of the snow gliding board can be specifically influenced locally. Preferably, the recesses penetrated the Schneegleitbrett in its entire thickness, so that locally removed material and thus the inertial mass is reduced. At the same time, the local weakening leads to a reduction in the stiffness of the snow gliding board.

Since the snow gliding boards according to the invention, as will be described in more detail below, can be formed thermally, such a local weakening can be fully or partially compensated or even overcompensated by corresponding spatial deformation. Local recesses that reduce the torsional stiffness can be compensated, for example, by a bulge of the sole. Ideally, the recesses in the soles are arranged such that they have continuous struts. In the present application, the term continuous strut is to be understood as meaning a region of the sole which runs without interruptions from one edge region to the other edge region. According to preferred embodiments, individual struts intersect and form nodes in the region of the central longitudinal axis. Particularly preferably, the recesses are shaped such that in the front and in the rear ski area of the struts a cable pattern is formed. The recesses may be individual large-area openings or fields formed by a number of perforations or slots.

To produce the snow gliding boards according to the invention, a multilayer laminate is produced as a plate-shaped semi-finished product, which is then processed by cutting and thermoforming to form the sole according to the invention. The consolidated laminate in sheet form can be thermoformed in a first step, wherein, for example, the later blade area bent front and rear if necessary, and the bias of the Schneegleitbretts is adjusted. In a further step, the outer contour of the snow gliding board is cut from the pre-bent plate. If, as described above, additional recesses are provided, these are cut or milled simultaneously or subsequently.

According to another method of the invention, the consolidated laminate in sheet form is cut in a first step and thermoformed in a subsequent step.

Basically, the choice of material according to the invention in one or more further steps makes it possible to set the curvature and / or torsion of at least the sole, preferably of the entire snow gliding board, by means of thermoforming as desired.

According to advantageous embodiments, the snow gliding boards, in particular skis, are shaped such that in a rest position - d. H. without the action of external forces and moments - have at least one torsion in the longitudinal direction. By "torsion" is meant here a geometric shape in which the snow sliding board is twisted or twisted along its longitudinal axis, as if a torsional moment acting on a possibly known from the prior art, unbundled snow sliding board. At least one area of the snow gliding board thus has a helical shape - but with a large pitch. The twist angle, d. H. the maximum angle between two said skewed straight lines is between about 0.2 ° and 60 °, for example between about 2 ° and 40 °, and preferably between about 8 ° and 20 °, in the snow sliding board according to the invention. The pitch of the helical shape of a snow gliding board according to the invention is in the range between about 3 m and 3600 m, for example between about 4.5 m and 360 m and preferably between about 9 m and 90 m.

Such a twist angle can be adjusted in the snow sliding board according to the present invention solely by heating over the softening temperature of the thermoplastic used, setting the desired angle of rotation and cooling and change almost any number of times. In the same way, the convex bias in the central region of the gliding board, the deflections in the area of the front blade and the rear end and the curvature in the transverse direction can be changed.

An essential feature of the aforementioned embodiments of the present invention is that the lower sole or sliding layer is not only intrinsically stable, but contributes significantly to the mechanical stability of the Schneegleitbretts. This becomes a considerable one Part is ensured by the new combination of materials whose properties are characterized in more detail below with reference to some characteristics.

The preferably used thermoplastic composite material (CF / PEEK) has a specific strength of at least 3 times higher than titanium, 4 times higher than aluminum and 5 times higher than steel. The CF / PEEK composite materials according to the invention have a fabric density of, for example, 1.56 g / cm ³ and a fiber basis weight of 145 g / m ² . The content of thermoplastic is 34% wt at a prepreg basis weight of 220 g / m ² . The nominal thickness of commercially available prefabricated prepregs which have been found to be advantageous is 0.136 mm, whose fiber density is 1.77 g / cm ³ . When cured, the density of the thermoplastic material is preferably 1.32 g / cm ³ .

On a semi-finished slab of 32 layers of unidirectional carbon fibers (type AS-4), with the following layer structure [(+ 45/0 / -45 / 90) ₄ ] _s and 4.5 mm thickness in a PEEK matrix (type APC2), the produced in a hot press, a tensile strength value of 762.5 MPa was achieved according to AITM 1-0007 type A, at 23 ° C., 50% rh.

The flexural strength was 1890 MPa and the attenuation was at least 15% higher than CF / epoxy composites.

Repeating fall test

In order to investigate differences in the energy consumption between thermosets and thermoplastics, drop weight tests were carried out. In this experiment, a sample is clamped onto a device. A weight repeatedly falls with increasing energy in the same place of the sample, whereby the introduced kinetic energy and the energy consumed by the breaking processes are measured. The energy balance shows that the CF / PEEK material is superior to the fiber-reinforced thermosets. CF / PEEK can both elastically and irreversibly absorb much more energy than the carbon fiber reinforced epoxides compared herewith.

moisture absorption

To study moisture uptake, pre-dried CF / PEEK and epoxy (914C) samples were stored in water at room temperature, taken at 24 hour intervals and weighed. At the end of the measurement (12 days), the PEEK samples had a significantly lower weight gain than the epoxy samples. The PEEK sample had already reached the maximum weight gain (0.14%) after 2 days, while the epoxy samples did not reach the maximum moisture increase after 12 days (> 0.3%).

Impact test

The results show a significantly higher impact strength of the CF / PEEK compared to the epoxy samples. While the impact strength of the epoxy samples decreases with increasing temperature, an increase can be seen in the CF / PEEK samples.

Another advantage of the snow gliding boards according to the invention is that the materials used are very readily recyclable, at least for the sole. In contrast to the recycling of fiber-reinforced thermosets, the recycling of fiber-reinforced thermoplastics is much more advantageous because theoretically the matrix can be melted in as often as desired. In the case of the endless fiber-reinforced thermoplastics used, however, it must be taken into consideration that the fiber structure in hammer or knife mills is largely destroyed by a process of material recycling and that only discontinuous long fibers with different fiber lengths are produced as starting material for further processing. This recycled material is therefore a material with poorer mechanical properties as the original material according to the invention. It has been shown that the mechanical property potential of pressed recycled material is well below the properties of continuous fiber reinforced thermoplastics, but far exceeds that of injection molded short fiber reinforced materials.

Further advantages and features of the invention will become apparent from the following description and the embodiments and with reference to the drawings.

Figur 1

einen Ski gemäss einer ersten Ausführungsform mit einer grossen Ausnehmung im vorderen Bereich;

Figur 2

eine Explosionsansicht eines Skis gemäss einer weiteren Ausführungsform in einer Ansicht von schräg Unten;

Figur 3

eine Explosionsansicht eines Skis gemäss der Figur 2 in einer Ansicht von schräg unten auf die Skispitze;

Figur 4

eine Ansicht eines zusammengebauten Skis gemäss der Figuren 2 und 3 bei dem nur die Kanten noch in einer Explosionsansicht gezeigt sind;

Figur 5

eine Explosionsansicht eines Skis gemäss einer weiteren Ausführungsform in einer Ansicht von schräg oben;

Figur 6

eine perspektivische Ansicht auf einen vorderen Bereich eines Skis gemäss einer weiteren Ausführungsform mit erfindungsgemässen Ausnehmungen;

Figur 7

eine perspektivische Ansicht auf einen vorderen Bereich eines Skis gemäss einer weiteren Ausführungsform;

Figur 8

eine perspektivische Ansicht auf einen Ski gemäss Figur 6;

Figur 9

eine perspektivische Ansicht auf das hintere Ende eines Skis gemäss Figur 8;

Figur 10

eine Draufsicht auf eine Detailvergrösserung des hinteren Endes eines Skis gemäss Figur 8;

Figur 11

eine Draufsicht auf das Vorderende eines Skis gemäss Figur 7; und

Figur 12

eine Draufsicht auf einen Ski gemäss einer weiteren Ausführungsform.

Show it

FIG. 1

a ski according to a first embodiment with a large recess in the front region;

FIG. 2

an exploded view of a ski according to another embodiment in a view from below obliquely;

FIG. 3

an exploded view of a ski according to the FIG. 2 in a view obliquely from below on the ski tip;

FIG. 4

a view of an assembled ski according to the Figures 2 and 3 in which only the edges are still shown in an exploded view;

FIG. 5

an exploded view of a ski according to another embodiment in a view obliquely from above;

FIG. 6

a perspective view of a front portion of a ski according to another embodiment with recesses according to the invention;

FIG. 7

a perspective view of a front portion of a ski according to another embodiment;

FIG. 8

a perspective view of a ski according FIG. 6 ;

FIG. 9

a perspective view of the rear end of a ski according FIG. 8 ;

FIG. 10

a plan view of a detail enlargement of the rear end of a ski according to FIG. 8 ;

FIG. 11

a plan view of the front end of a ski according to FIG. 7 ; and

FIG. 12

a plan view of a ski according to another embodiment.

In the FIG. 1 is a ski 1 according to a first embodiment with a large approximately rectangular recess 20 in the front region of the ski 1 in a view obliquely from below on the tread 30 shown. The ski 1 is preferably made monolithically from a composite material of continuous fibers embedded in a thermoplastic material. Due to the large recess 20 in the front region of the ski 1, the weight and thus the inertia in this area is substantially reduced. However, the edge portions remain in full length, so that in this respect the handling characteristics are not degraded compared to a full length solid ski. In order not to produce any undesirable resistance in the region of the trailing edge 21 of the recess 20, this edge is tapered forward or slightly bent. Without deviating from the basic idea of the invention, the underside 30 of the ski can be coated with a thin sliding coating.

In the FIG. 2 is an exploded view of a ski 2 according to another embodiment shown in a view obliquely from below. The ski is made up of a sole 10 a Core 11 and a top layer 12 together, the sole 10 is provided on both sides with steel edges 13.

From the exploded view according to the FIG. 3 will be in synopsis with the FIG. 4 the principle of interchangeable coating clearly. The core 11 is provided on the longitudinal side 111, 112 in each case with a continuous groove and dimensioned such that it can be inserted completely positively into a recess formed by recesses 121 and 101 in the sole 10 and top flange 12. The two recesses 121, 101 have on their longitudinal sides in each case an undercut, which engage in the grooves 111, 112 on the core and thus can produce the desired form fit. In the assembled state, as in the FIG. 4 is illustrated, engages the blade-shaped tapered front end 113 of the core 11 through a window 102 in the sole 10 and thereby fixed sole and upper flange in the blade area securely together.

If no value is placed on the rapid change of the covering in the form of the sole 10, the individual parts 10, 11 and 12 can be glued or welded together.

From the exploded view according to the FIG. 5 It can be seen that a sole 100 according to the invention can also be used with a ski 3 in sandwich construction. On the supporting sole 100 in turn edges 13 are arranged. A thin tread 17 made of suitable material is not intrinsically stable. An intermediate layer 14 of two side cheeks and a central support rod is located between a top flange 15, which in turn is covered by a cover layer. According to the present invention, it is essential that the sole 100, which has a thickness of at least 0.5 mm and consists of a composite material of continuous fibers embedded in a thermoplastic material, significantly affects the properties of the ski and by their high stability, a significant weight reduction allowed the use of lighter and less stable materials in the remaining assemblies 14, 15 and 16.

In the FIG. 6 is shown in a perspective view from above on a front portion of a ski 4 with a number of recesses 122, 123, 124 and 125. These recesses are arranged so that two struts 126, 127 interconnect the laterally extending edge regions 1218, 129. The two struts 126, 127 intersect and form a node in the region of the central longitudinal axis. Since a number of further recesses form further struts, a pattern arises in the front region of the ski that resembles a symmetrically entangled two-strand braid. The blade and the area in front of the formation area of the ski 4, which is shown only partially, have further recesses for weight reduction.

In FIG. 7 is shown in an enlarged detail, the front end of a ski 5 according to another embodiment. In the figure, recesses 131, 132, 133, 134 are shown, which are each formed by a plurality of transverse slots, which pass through the ski completely or partially. The recesses 131, 132, 133, 134 in turn form two struts 135, 136 which extend without interruption from the left to the right edge region 137, 138. The two struts 135, 136 intersect at the apex of the curved ski 5.

From the total view of the ski 4 according to the FIG. 8 It is clear that the weight-reducing recesses can be advantageously arranged both in the front and in the rear of the ski. In the illustrated embodiment, only the education remains free of recesses.

In the plan view according to FIG. 11 from the top to the front of the ski 4, as he also in the FIGS. 6 and 8th is shown, an advantageous embodiment of the inventive recess becomes clear. By means of two struts it is illustrated that the struts in the planar projection preferably do not run linearly but are each slightly curved in an S-shape. In the FIG. 11 this S-shaped curve is dashed for two shown crossing struts. From the FIG. 11 is yet another type of recesses evident. The recess 90 passes through in the illustrated embodiment such that the upper and the lower opening in the planar projection are not congruent.

Based on Figures 9 and 10 will now be discussed on this second type of recess. In the FIG. 9 Such a recess is shown in the region of the rear end of a ski in a perspective view. The hidden edges are partly drawn fictitious. In conjunction with the FIG. 10 is clearly that the upper and lower openings of the recess are arranged approximately mirrored. This results in that the lateral walls 51, 52 of the recess do not run vertically with respect to the lower sliding surface of the ski but are strongly twisted. Considering only the side walls of the recess 50, it is quite possible to speak of a torsion about its longitudinal axis. This torsion causes the upper edge 53 and the lower edge 54 to intersect each other in planar projection into a node. The same applies to the upper and lower edges of the second side area. This embodiment of the weight-reducing breakthroughs gives the ski much better properties than a breakthrough with side walls which are arranged perpendicular to the lower running surface of the ski. Depending on the size and geometry (ie the shape and size of the upper and the lower opening and corrosion of the side walls) of the recess, the stiffness and the damping properties of the ski can be influenced.

In the FIG. 12 is a ski according to another embodiment shown, in which two weight-saving recess of the type described above are arranged. For those skilled in the art, it will be understood from the embodiments described above that these recesses can also be arranged next to one another at other locations in the front and rear regions of the ski, or depending on the size, and that the advantages of the novel recesses also apply to other types of snow gliding boards let realize. The recesses can thereby the boards completely or only partially enforce. If the boards are completely penetrated, it is advantageous to tilt the rear walls of the recesses so that the snow is not guided into the recess.

Claims (15)

1. Snowglide board (1, 2, 3, 4, 5), characterized in that it comprises a supporting sole (10, 100) having a thickness of at least 0.5 mm and consists of a composite material of continuous fibres embedded in a thermoplastic material.
2. Snowglide board (1, 2, 3, 4, 5) according to claim 1, characterized in that the sole (10, 100) extends over the entire width of the snowglide board (1, 2, 3, 4, 5).
3. Snowglide board (1, 2, 3, 4, 5) according to claim 1 or 2, characterized in that the continuous fibres are present in the sole (10, 100) as unidirectional continuous fibres, a non-crimp fabric of fibre bundles, a woven fabric, a woven fabric preferably of fibre bundles and combinations thereof.
4. Snowglide board (1, 2, 3, 4, 5) according to one of the preceding claims, characterized in that the sole (10, 100) is a laminate made up of a plurality of fibre plies, wherein the orientation of the fibres in the laminate being anisotropic or quasi-isotropic with respect to the longitudinal axis of the snowglide board (1, 2, 3, 4, 5).
5. Snowglide board (1, 2, 3, 4, 5) according to one of the preceding claims, characterized in that fibres are oriented in the following directions with respect to the longitudinal axis of the snow glide board (1, 2, 3, 4, 5) in the quasi-isotropic laminate: 0°, +45°, 90°, -45°, and in that fibres are oriented in the following directions with respect to the longitudinal axis of the snowglide board (1, 2, 3, 4, 5) in the anisotropic laminate: 30°, -10°, 50°, -60°.
6. Snowglide board (1, 2, 3, 4, 5) according to claim 5, characterized in that the fibres are oriented unidirectionally in each of the individual fibre plies.
7. Snowglide board (1, 2, 3, 4, 5) according to claim 5 or 6, characterized in that the direction of the fibres changes in adjacent fibre plies.
8. Snowglide board (1, 2, 3, 4, 5) according to one of the preceding claims, characterized in that the thermoplastic is selected from the group of: high-density polyethylene (HDPE), polyamide (PA), polyphenylene sulphide (PPS), polyethylenimine (PEI), polyether ketone (PEKK) or polyether ether ketone (PEEK), and the continuous fibres are selected from the group of: carbon fibres, basalt fibres, aramid fibres, glass fibres or steel fibres, wherein the material combination of polyether ketone/carbon fibre is particularly preferred.
9. Snowglide board (1, 2, 3, 4, 5) according to one of the preceding claims, characterized in that the sole (10, 100) is adhesively bonded with the edges (13) and/or a core (11) and an upper chord or an upper ply (12, 15), wherein the adhesive is a meltable adhesive which can be changed into the molten state at a temperature which lies below the softening temperature of the thermoplastic in the composite material, or in that the sole (10, 100) is adhesively bonded with the edges (13) and connected to a core (11) and/or an upper chord or an upper ply (12, 15) in a form-locked and/or force-locked manner.
10. Snowglide board (1, 2, 3, 4, 5) according to one of the preceding claims, characterized in that the snowglide board (1, 2, 3, 4, 5) consists integrally of the sole (10, 100) with edges (13) fitted on both sides.
11. Snowglide board (1, 2, 3, 4, 5) according to one of the preceding claims, characterized in that an exchangeable sole (10, 100) is adhesively bonded with the edges (13) and connected to an exchangeable core (11) and/or an upper chord or an upper ply (12, 15) in a form-locked and/or force-locked manner.
12. Method for producing snowglide boards according to one of the preceding claims, characterized in that the sole (10, 100) is produced by cutting and thermoforming from a consolidated laminate as a semifinished product .
13. Method for producing snowglide boards (1, 2, 3, 4, 5) according to claim 12, characterized in that the consolidated laminate is thermoformed in plate form in a first step and cut to size in a further step.
14. Method for producing snowglide boards (1, 2, 3, 4, 5) according to claim 13, characterized in that the consolidated laminate is cut to size in plate form in a first step and thermoformed in a further step.
15. Method for producing snowglide boards (1, 2, 3, 4, 5) according to claim 13 or 14, characterized in that curvature and/or torsion at least of the sole (10, 100), preferably of the entire snowglide board (1, 2, 3, 4, 5), are set by means of thermoforming in a further step.

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