EP4496640A1 - Sportgerät zum gleiten auf oberflächen - Google Patents
Sportgerät zum gleiten auf oberflächenInfo
- Publication number
- EP4496640A1 EP4496640A1 EP23711939.1A EP23711939A EP4496640A1 EP 4496640 A1 EP4496640 A1 EP 4496640A1 EP 23711939 A EP23711939 A EP 23711939A EP 4496640 A1 EP4496640 A1 EP 4496640A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fibers
- sports equipment
- layer
- core layer
- matrix material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
- A63C5/00—Skis or snowboards
- A63C5/12—Making thereof; Selection of particular materials
- A63C5/126—Structure of the core
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
- A63C5/00—Skis or snowboards
- A63C5/03—Mono skis; Snowboards
Definitions
- the invention relates to sports equipment for sliding on surfaces according to the preamble of claim 1.
- Sports equipment for sliding on surfaces includes, for example, skis such as alpine skis, cross-country skis and touring skis, or even snowboards. This also includes water skis or wakeboards. Further sports equipment for sliding on surfaces will be apparent to the expert from these exemplary references. What all such sports equipment has in common is that it has mechanical properties tailored to its specific intended use. For example, alpine skis can be produced with a wide range of bending and torsional stiffness to suit the needs of skiers of varying skill levels. Skis can also be tailored to their intended use, for example for deep snow, off-road or piste skiing. Competition skis for ski races on ski slopes, for example, have a particularly high level of bending and torsional rigidity in order to enable particularly fast cornering and to ensure a high level of smoothness.
- skis have a wooden core, the so-called core layer, to which one or more layers of different materials are applied. At least one further layer, which forms the so-called covering, faces the surface or the snow during operation. Furthermore, a design layer is usually provided, which is attached to the side of the ski facing away from the snow. It is also known in the prior art to manufacture the core layer from other materials such as wood. For example, attempts have been made to replace the wood of the core layer with fiber-coated stone material. Such a ski is known from DE 202017 003 752 Ul. This allows the mechanical properties of the ski to be easily adapted to the intended use.
- a disadvantage of such solutions is that the core layer fatigues during operation of the ski due to the forces continuously acting on the ski. This leads to the stone material known from DE 202017 003 752 Ul beginning to become brittle, which changes its mechanical properties, and the bending and/or torsional rigidity of the ski constructed in this way decreases. In the worst case scenario, this causes the core layer to lose its cohesion and crumble, causing the ski to buckle in one or more places. If this happens, the ski is unusable and can only be thrown away. It is the object of the present invention to provide a sports device for sliding on surfaces which avoids these disadvantages of the prior art.
- the sports equipment according to the invention for sliding on surfaces has a multi-layer structure, comprising a core layer and at least one further layer facing the surface during operation.
- the core layer extends substantially along an entire length of the sports equipment and comprises a matrix material and at least one layer of fibers.
- the core layer also has a central region arranged essentially centrally along the length of the sports equipment.
- the matrix material is essentially penetrated by the at least one layer along the entire central region, and the matrix material is a mineral building material such as concrete.
- the layer of fibers has a prestress.
- the bending properties or the stress and expansion properties, as well as the damping properties of the sports equipment in this central area can be adjusted to the respective can be specifically adapted to the application.
- the pre-stressing of the layer of fibers creates additional compressive stresses, which prevent or greatly delay the formation of cracks under load. This also prevents or at least greatly delays a gradual breaking or crumbling of the matrix material. This improves the lifespan of the sports equipment.
- the central region extends essentially along an entire length of the sports equipment. This allows the mechanical properties in every area of the sports equipment to be designed in a targeted manner by connecting the matrix material and the layer of fibers.
- the core layer comprises an area on both sides of the central area, which is made of a material different from the central area.
- the central area can have different mechanical properties from the rest of the sports equipment.
- the at least one layer of fibers is prestressed in a longitudinal direction and/or transverse direction of the core layer. This allows the torsional rigidity and bending rigidity of the sports equipment to be varied.
- the pretension of the at least one layer of fibers can vary along the longitudinal direction and/or the transverse direction of the core layer. As a result, different areas of the sports equipment can be prestressed to different degrees.
- the layer of fibers can include, for example, plastic fibers, glass fibers, basalt fibers, aramid fibers, carbon fibers and / or natural fibers such as bamboo fibers, the fibers preferably being combined into one or more fiber bundles and impregnated with, for example, epoxy resin.
- the impregnated fiber bundles are preferably sanded on the surface.
- the matrix material is preferably concrete with aggregate grains that have a maximum diameter of 4mm. This allows a particularly fine-grained structure of the matrix material to be achieved.
- the matrix material is interspersed with several layers of fibers, and at least two layers have a prestress.
- the at least two prestressed layers have different prestressing directions from one another and/or are prestressed to different degrees. This allows the bending strength of the ski to be progressively increased.
- the sports equipment is a ski or a snowboard.
- at least one ski binding or a snowboard binding is arranged in that area of the ski or snowboard in which the central area of the core layer is located.
- the prestress is selected such that the prestress in the fibers is more than 0% and up to 60% of the breaking strength of the fibers. This means that the fibers can only be slightly stretched, thereby achieving fiber alignment.
- Figure 1 shows a sectional view of a sports device according to the invention with a core layer.
- Figure 2 shows a schematic representation of the core layer in a top view.
- Figure 3 shows a schematic representation of the core layer in a side view.
- a sports device 1 according to the invention for sliding on surfaces with a multi-layer structure is shown in a sectional view in FIG. The surface itself is not shown.
- the sports device 1 according to the invention comprises a core layer 2 and at least one further layer 3 facing the surface during operation.
- This layer 3 can, for example, be a sliding coating if the sports device 1 is used as a winter sports device, such as is designed as a ski or snowboard.
- the core layer 2 extends essentially along an entire length of the sports equipment 1 and comprises a matrix material 4 and at least one layer 5 made of fibers.
- the core layer 2 also has a central region 6 arranged essentially centrally along the length of the sports equipment 1, the matrix material 4 being penetrated by the at least one layer 5 essentially along the entire central region 6, and the matrix material 4 being a mineral building material such as concrete is.
- Concrete that can be used within the scope of the invention is also fine-grain concrete with a grain size of preferably less than 4 mm.
- the central area 6 of the core layer 2 can also be made as a prefabricated part or from in-situ concrete.
- the position 5 is also shown in Figure 2 and Figure 3, which show the central area 6 in a schematic representation from above and from the side.
- the layer 5 made of fibers also has a prestress.
- This prestressing can be applied, for example, as part of the production of the core layer 2 by prestressing the layer 5 of fibers, for example with a clamping frame, a clamping device or other aids, and then casting the matrix material 4 around it.
- the clamping device and/or the clamping frame preferably comprise one or more hydraulic cylinders for applying the preload.
- the core layer 2 in the central region 6 receives a prestress, which is defined by the prestress applied to the layer 5 of fibers.
- This pretension gives the sports equipment in the central area 6 tension, expansion and damping properties, which can be adapted to the planned application of the sports equipment 1 during the production of the sports equipment 1. This allows a range of sports equipment 1 with different properties to be produced using the same construction materials and the same method.
- This construction method makes it possible to produce very thin-walled cross-sections in the range of 8-12 mm with very high load-bearing capacities compared to wooden cross-sections, as well as higher torsional and bending stiffness with adequate damping behavior, whereby this depends on the number of Layers 5 of fibers, the pre-tension of which depends on the material of the fibers.
- the durability is also very high and therefore represents an economical variant over the service life compared to other building materials with these strength properties.
- the prestress is selected such that the prestress in the fibers is more than 0% and up to 60% of the breaking strength of the fibers.
- the fibers can only be slightly stretched, thereby achieving fiber alignment.
- biases of 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55% and 60% and ranges between these values can be provided.
- the fibers can be prestressed to different degrees in different spatial directions, for example within the framework of the prestresses mentioned.
- the central region 6 extends essentially along an entire length of the sports equipment 1.
- the preload can be applied to the entire sports equipment 1 by means of the layer 5.
- the core layer 2 can include an area on both sides of the central area 6, which is made of a material that is different from the central area 6.
- the areas adjoining the central area 6 can be made of fiberglass, wood, carbon, etc.
- the sports equipment 1 can also only include an area on one side of the central area 6, which is made of a material that is different from the central area 6.
- the at least one layer 5 made of fibers can be prestressed in a longitudinal direction L of the core layer 6, which can be seen in FIG. 2, and/or in a transverse direction Q of the core layer 6.
- the prestressing of the at least one layer 5 made of fibers can also vary along the longitudinal direction L and/or the transverse direction Q of the core layer 2.
- different areas of the sports equipment 1 can have different mechanical properties.
- the layer 5 of fibers can comprise plastic fibers, glass fibers, basalt fibers, aramid fibers, carbon fibers and/or natural fibers such as bamboo fibers.
- the mechanical properties of the core layer 2 can be designed in a targeted manner through the mechanical properties of the selected fibers.
- the fibers can also be in processed form. For example, a felt, a fabric, a knitted fabric, embroidered textiles, etc. can be formed by the fibers.
- the layer of fibers can comprise bundled endless fibers, or several longitudinal fiber strands with or without transverse fiber strands.
- the layer can therefore consist of bundled endless fibers, a single fiber strand, several parallel fiber strands, processed textiles such as wovens, braids, knitted fabrics, knitted fabrics and/or embroideries consist of or include these.
- the fibers can also be in the form of processed products such as rods or strands.
- the respective fiber bundles can be impregnated and/or also have a processed surface, such as sanding, to improve the composite properties.
- the fibers are preferably sanded or unsanded carbon fiber strands.
- the selected matrix material 4 is preferably a concrete with aggregates which have a maximum diameter of 4mm. Such concrete is also referred to as fine combination concrete or mortar. Alternatively, matrix materials such as stoneware can also be used.
- the matrix material 4 can also, as can be seen in Figure 3, be penetrated by several layers 4 of fibers, with at least two layers 5 having a prestress. These at least two prestressed layers 5 can also have different prestressing directions and/or be prestressed to different degrees.
- the sports equipment 1 can be a ski or a snowboard.
- the sports equipment according to the invention can also be, for example, a water ski, a wakeboard and the like.
- at least one ski binding or a snowboard binding is arranged in that area of the sports equipment 1 designed as a ski or snowboard in which the central area 6 of the core layer 2 is located.
- the core layer 2 provided in the context of the present invention and its structure make it possible to produce very thin-walled cross-sections in the range of 8-12 mm with very high load-bearing capacities compared to wooden cross-sections, as well as higher torsional and bending stiffness with adequate damping behavior, which depends on the mechanical properties and the cross-sectional area of the embedded fiber reinforcement, as well as the degree of prestressing, resulting in a new application in the ski sports equipment sector.
- the durability is also very high and therefore represents an economical variant over its service life compared to other building materials with these strength properties.
- the ski core or core layer 2 of the ski has always been the heart of every ski. There used to be wooden skis, but until today the core was made of wood. The core is covered with high-quality materials to influence the properties of the skis. Almost all high-quality skis are sandwich constructions. The preload of the ski is one of the most important properties for the handling of the skis. In order to maximize these and other factors such as smooth running and elasticity, many types of wood have been used as natural materials. The layers above and below are varied with first-class materials such as carbon and titanium. Vibration tests were carried out on test specimens of a core layer 2, the test specimens having dimensions of approximately oscillation length and approximately 10cm width.
- test specimen PK6 is unreinforced, all other test specimens PK1 to PK5 were reinforced in two layers, with layers 5 comprising textile reinforcements made of carbon fibers, which were soaked with epoxy resin and made smooth or additionally sanded.
- layers 5 comprising textile reinforcements made of carbon fibers, which were soaked with epoxy resin and made smooth or additionally sanded.
- test specimen made of wood and a ski as a reference test specimen. Starting with “load level 0”, in which the test specimens were examined unloaded and in an uncracked state, the load was increased with each additional load level. In load level 1, the test specimens were loaded up to a defined force, in which case the first cracks formed in all reinforced components.
- the damping values from the preliminary tests are of a similar order of magnitude to that of a conventional ski.
- the bending stiffness of the textile-reinforced components when cracked is lower than comparable skis with a wooden core.
- textile-reinforced core layers 2 are prestressed, as a result of which the matrix material 4 remains free of cracks under load. This significantly increases the rigidity, which means that other areas of application such as classic piste skis can also be opened up.
Landscapes
- Laminated Bodies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA50188/2022A AT525996B1 (de) | 2022-03-23 | 2022-03-23 | Sportgerät zum Gleiten auf Oberflächen |
| PCT/AT2023/060070 WO2023178370A1 (de) | 2022-03-23 | 2023-03-13 | Sportgerät zum gleiten auf oberflächen |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP4496640A1 true EP4496640A1 (de) | 2025-01-29 |
| EP4496640C0 EP4496640C0 (de) | 2026-01-28 |
| EP4496640B1 EP4496640B1 (de) | 2026-01-28 |
Family
ID=85704881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23711939.1A Active EP4496640B1 (de) | 2022-03-23 | 2023-03-13 | Sportgerät zum gleiten auf oberflächen |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20250205584A1 (de) |
| EP (1) | EP4496640B1 (de) |
| AT (1) | AT525996B1 (de) |
| CA (1) | CA3246332A1 (de) |
| WO (1) | WO2023178370A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1082534B (de) * | 1954-08-09 | 1960-05-25 | Jack Boison Nethercutt | Ski |
| AT349367B (de) * | 1975-06-20 | 1979-04-10 | Rossignol Sa | Mehrschichtiger ski |
| DE29818660U1 (de) * | 1998-10-20 | 1999-03-04 | Brauner, Siegfried, 86660 Tapfheim | Steingutträger |
| DE102007055532B4 (de) * | 2007-11-21 | 2012-09-06 | Technische Universität Chemnitz | Spiel- oder Sportgerät |
| DE202009017666U1 (de) * | 2009-12-25 | 2010-05-20 | Kuse, Kolja | Steinträger |
| DE202017003752U1 (de) * | 2017-07-18 | 2017-12-12 | Kolja Kuse | Ski-Kern aus faserstabilisiertem Steinmaterial |
-
2022
- 2022-03-23 AT ATA50188/2022A patent/AT525996B1/de active
-
2023
- 2023-03-13 CA CA3246332A patent/CA3246332A1/en active Pending
- 2023-03-13 EP EP23711939.1A patent/EP4496640B1/de active Active
- 2023-03-13 WO PCT/AT2023/060070 patent/WO2023178370A1/de not_active Ceased
- 2023-03-13 US US18/849,717 patent/US20250205584A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20250205584A1 (en) | 2025-06-26 |
| CA3246332A1 (en) | 2025-06-13 |
| EP4496640C0 (de) | 2026-01-28 |
| AT525996B1 (de) | 2023-10-15 |
| WO2023178370A1 (de) | 2023-09-28 |
| AT525996A4 (de) | 2023-10-15 |
| EP4496640B1 (de) | 2026-01-28 |
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