CA2039154A1 - Ski or snowboard made of several layers - Google Patents
Ski or snowboard made of several layersInfo
- Publication number
- CA2039154A1 CA2039154A1 CA 2039154 CA2039154A CA2039154A1 CA 2039154 A1 CA2039154 A1 CA 2039154A1 CA 2039154 CA2039154 CA 2039154 CA 2039154 A CA2039154 A CA 2039154A CA 2039154 A1 CA2039154 A1 CA 2039154A1
- Authority
- CA
- Canada
- Prior art keywords
- ski
- snowboard
- elastic insert
- insert
- coating
- 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.)
- Abandoned
Links
- 241001481833 Coryphaena hippurus Species 0.000 claims abstract description 15
- 238000013016 damping Methods 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 229920001971 elastomer Polymers 0.000 claims description 9
- 230000001413 cellular effect Effects 0.000 claims description 7
- 229920001821 foam rubber Polymers 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 2
- 210000002615 epidermis Anatomy 0.000 description 4
- 210000003491 skin Anatomy 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 241001125840 Coryphaenidae Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 210000000653 nervous system Anatomy 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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
- A63C5/122—Selection of particular materials for damping purposes, e.g. rubber or the like
-
- 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
- A63C5/04—Structure of the surface thereof
- A63C5/044—Structure of the surface thereof of the running sole
-
- 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
- A63C5/04—Structure of the surface thereof
- A63C5/056—Materials for the running sole
Landscapes
- Road Paving Structures (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
- Laminated Bodies (AREA)
Abstract
Abstract The invention relates to a ski or snowboard consisting of several layers, whose lowest layer forming the coating of the running surface is laterally bordered by steel edges. According to the invention, for the purpose of maintaining a laminar flow around the ski during action, between the coating (5) and the layered ski or snowboard body (1, 2, 3) a correspondingly dimensioned elastic insert (6) imitating the flow damping skin of a dolphin is inserted, whereby the turbulences occurring at the coating (5) of the running surface during running due to melt water are compensated.
Description
20391~4 erbacher Ski + Tennis AG
Heinrich-Hammer-Strasse 6 7904 Erbach/Donau 7900 Ul~, 13.07.90 st P 389 a MULTILAYERED SKI OR SNOWBOARD
The invention relates to a ski or snowboard consisting of several layers in cross section; it relates to alpine, cross-country as well as to any kind of special ski, e.g. jumper ski.
The aim pursued in both types of skis, as well as snowboards, is to make them as rapid as possible, i.e. to lower their resistance to friction.
Nature offers solutions to this problem, in the present case it is the dolphin. It is known that dolphins can reach surprisingly high projection speeds, which can not be explained only by muscle power. In this connection, the following can be 20391~
read in the book "Natur als Konstrukteur" (Nature as a Builder) by Klaus Wunderlich and Wolfgang Goede, Edition Verlag Leipzig 1977, on page 54, as quoted: " It is a fact that the specific muscle power (of the dolphin) is not abnormally high, but that the flow resistance is reduced to approximately one tenth of the value of theoretically calculated for the body of the dolphin, due to natural "devices". In this respect, the dolphin has a big advance on technical sciences. In the language of fluid mechanics a low flow resistance is equivalent to fully laminar flow about a body - flow without vortex formation in the boundary layer and behind the body. As long as the flow stays laminar, the resistance increases in proportion with the speed. When turbulences occur, the resistance increases in leaps and then starts to increase by the square value of the speed."
And further on the same page it reads:
The epidermis of the dolphin, where all d~cisive flow configurations occur, plays the most important part. It vibrates with the boundary layer wave occurring at the onset of turbulence and attenuates it. Thereby, those dangerous harbingers of turbulence are suppressed. The epidermis which is approximately 1.5 mm thick is very well equipped for this special task. It consists of a foldable membrane 0.5 ~m thick and an underlaying lmm thick elastically deformable damping layer formed of up to 20391~4 80% of water. In the finest channels, this water can flow parallelly to the surface. Underneath, there is the approximately 6 mm thick inner membrane, consisting of a very tough and tenacious tissue. Through the soft epidermis, vibrations in the boundary layer are transmitted to the damping layer where due to the deformation the water has to flow through the narrow channels towards other areas. The minute channel diameters brake the inner water flow in this layer and this way damp the vibration, similar to a vehicle shock absorber. All these are passive processes which take place automatically in the corresponding flow conditions and are not influenced by the nervous system of the dolphin."
The invention is based on the concept that during action processes similar to the ones occurring in the dolphin moving through water take place. Namely on the running surface of the ski during action a similar water film is created, which is subjected to turbulence formation, thereby having a braking effect on the ski. The formation of such turbulences can be suppressed in a manner analogous to the dolphin, when in a multilayered ski or snow board the lowermost layer forming its running surface is laterally bordered by steel edges and according to the invention for the purpose of maintaining a laminar flow around the ski during action, between the running surface coating and the layered sXi or snowboard body, an elastic insert imitating the flow-damping skin of a dolphin is 2039~54 integrated, whereby the turbulence~ occurring during action on the coating of the ski bottom essentially due to the melt water are compensated.
Tests run with a ski profile built in the aforementioned manner have proven this hypothesis to be correct. Skis provided with such a damping layer were considerably more rapid than comparable ski types.
Elastic inserts are actually known in ski construction. So for instance elastic insets are used to improve the ~oints in skis having steel edges made of several pieces for the elimination of movements between these edge links and the coating of the running surface (DE-OS 18 11 071), further for the vibration damping of a ski in the case of elastic layering of materials with a high modulus of elasticity (German Patent 24 34 423), as well as for improving the climbing assistance in cross-country and touring ski (DE-OS 37 23 974) Furthermore, from DE-OS 32 16 654 it is known to build in a damping plate underneath the ski hinding for shock a~sorption and finally the DE-OS 29 41 436 discloses the insertion of a rubber-like layer between the upper and the lower band of a ski, wherein twisted fiber bundles are embedded in the longitudinal direction of the ski for higher tensile strength. Thereby, on the one hand an increase of damping capability and on the other hand a better rigidity of the ski are intended. By arranging fibers in stranded bundles the damping capability of the ski is improved because the ~piral-shaped fibers in the stranded bundles are energy-absorbant.
- Besides the fact that the prior art aims at different objectîves, these known damping layers do not achieve the purpose and do not offer the solution of the present invention, which consist in improving the flow interaction between the ski body and the subctrate (snow) in a technical imitation of dolphin skin. Thereby, the coating of the running surface corresponds to the epidermis of the dolphin, the traction band corresponds to the inner membrane. In between, there is an elastic insert made of rubber or elastomer, which can be either solid, perforated or sectional. The thereby formed chamber or channels can be filled with a compressed medium (gas or liquld): suitably they are interconnected.
An elastic insert of cellular rubber or foam rubber, two rubber types which have a cellular, sponge-like structure, has proven to be particularly advantageous. Primarily, under the term of cellular rubber a product commercially available under the name NR is meant, while by foam rubber a product commercially available under the name NRB i~ meant. The Shore hardness A of these elastic inserts should suitably range between 10 and 90, preferably 35.
The proposed materials to be used can have a thickness of 0.5 to 3 mm, preferably between 1.5 and 2 mm. They are inserted between the wider legs of the steel edge section, preferably glued in. In order for these thicknesses to be practical, it is further advisable for the layered ski or snowboard body to be provided with a longitudinally running groove on the side of the traction or lower band of the ski or snowboard, wherein the elastic insert can be embedded or glued in.
Such a running surface construction can be provided in any desired length, up to the maximum of the entire ski length.
As long as the insert is made of a solid material, e.g. of cellular rubber or foam rubber, the damping of the flow turbulences occurring at the coating of the outsole takes place by displacement of the trapped air trapped in the elastic insert (cellular or foam rubber) in the same way the water particles are displaced in the damping layer of the dolphin's skin.
2039~
The elastic insert can also be structured with hollow chambers, whereby preferably the hollow spaces are interconnected.
Further, the elastic insert can be a corrugated cross section profile with hollow spaces in the longitudinal direction of the ski; in this case too the hollow spaces are preferably interconnected.
Finally, the elastic insert can present a one- or two-sided knobbed cross section profile, which is particularly advantageous when it comes to weight reduction.
. Embodiment examples of the invention are represented in the drawing, which shows:
Fig. 1 a cross section through a ski profile with a simple rubber insert of solid material, Fig. 2 a cross section through a ski profile with an insert structured as a hollow chamber, Fig. 3 a ski profile having a corrugated insert, 203915~
Fig. 4 a ski profile with knob-like configuration of the elastic insert, Fig. 5 a ski profile with a perforated elastic insert Fig. 6 a ski profile with a longitudinally running groove in the layered ski body.
In all embodiment examples, the core of the ski body is marked 1, the compression band is marked 2, the traction band is marked 3, the steel edges are marked 4 and the coating of the running surface is marked 5. Between traction band 3 and steel edges 4 the rubber insert 7 is provided.
Between the running surface 5 and the traction band 3 an elastic insert 6 i~ now embedded, preferably glued in, which in the embodiment of Fig. 1 is made of cellular or foam rubber with a Shore hardness between 10 and 90, preferably 35. This elastic insert has a thickness between 0.5 and 3mm, preferably between 1.5 and 2 mm.
In the embodiment according to Fig. 2, the elastic insert 6 is a hollow chamber profile, the hollow chambers being marked 8.
They are closed ~t their ends but have mutual connections.
In Fig. 3, an embodiment is shown wherein the elastic insert 6 is a corrugated profile. In this case too the hollow spaces of the corrugated profile are interconnected.
lgO94 In Fig. 4 an embodiment is shown wherein the damping layer has knobs on one side, so that between these knsbs hollow spaces 9 are created. These knobs can also be arranged on both side~.
The hollow spaces existing in the elastic inserts in the embodiment examples according to Fig. 2, 3 and 4, which are normally filled with air, can also be filled with a compressed liquid.
Finally, in Fig. 5 an embodiment is shown wherein the elastic insert 6 is perforated. The punched holes are marked 10.
In the embodiment of Fig. 6, the ski body is provided with a groove running in the longitudinal direction of the ski, wher~in first the lower band 3 and right next to it the elastic insert 6 are lodged. The latter can be glued in or only embedded.
With an elastic insert according to the invent$on the same effect as the one occurring in the dolphin' 6 skin as initially described, is achieved. Thereby the turbulences at the bottom side of the running-surface coating which normally consists of polyethylene are avoided to a large extent and the ski can reach higher speeds.
Heinrich-Hammer-Strasse 6 7904 Erbach/Donau 7900 Ul~, 13.07.90 st P 389 a MULTILAYERED SKI OR SNOWBOARD
The invention relates to a ski or snowboard consisting of several layers in cross section; it relates to alpine, cross-country as well as to any kind of special ski, e.g. jumper ski.
The aim pursued in both types of skis, as well as snowboards, is to make them as rapid as possible, i.e. to lower their resistance to friction.
Nature offers solutions to this problem, in the present case it is the dolphin. It is known that dolphins can reach surprisingly high projection speeds, which can not be explained only by muscle power. In this connection, the following can be 20391~
read in the book "Natur als Konstrukteur" (Nature as a Builder) by Klaus Wunderlich and Wolfgang Goede, Edition Verlag Leipzig 1977, on page 54, as quoted: " It is a fact that the specific muscle power (of the dolphin) is not abnormally high, but that the flow resistance is reduced to approximately one tenth of the value of theoretically calculated for the body of the dolphin, due to natural "devices". In this respect, the dolphin has a big advance on technical sciences. In the language of fluid mechanics a low flow resistance is equivalent to fully laminar flow about a body - flow without vortex formation in the boundary layer and behind the body. As long as the flow stays laminar, the resistance increases in proportion with the speed. When turbulences occur, the resistance increases in leaps and then starts to increase by the square value of the speed."
And further on the same page it reads:
The epidermis of the dolphin, where all d~cisive flow configurations occur, plays the most important part. It vibrates with the boundary layer wave occurring at the onset of turbulence and attenuates it. Thereby, those dangerous harbingers of turbulence are suppressed. The epidermis which is approximately 1.5 mm thick is very well equipped for this special task. It consists of a foldable membrane 0.5 ~m thick and an underlaying lmm thick elastically deformable damping layer formed of up to 20391~4 80% of water. In the finest channels, this water can flow parallelly to the surface. Underneath, there is the approximately 6 mm thick inner membrane, consisting of a very tough and tenacious tissue. Through the soft epidermis, vibrations in the boundary layer are transmitted to the damping layer where due to the deformation the water has to flow through the narrow channels towards other areas. The minute channel diameters brake the inner water flow in this layer and this way damp the vibration, similar to a vehicle shock absorber. All these are passive processes which take place automatically in the corresponding flow conditions and are not influenced by the nervous system of the dolphin."
The invention is based on the concept that during action processes similar to the ones occurring in the dolphin moving through water take place. Namely on the running surface of the ski during action a similar water film is created, which is subjected to turbulence formation, thereby having a braking effect on the ski. The formation of such turbulences can be suppressed in a manner analogous to the dolphin, when in a multilayered ski or snow board the lowermost layer forming its running surface is laterally bordered by steel edges and according to the invention for the purpose of maintaining a laminar flow around the ski during action, between the running surface coating and the layered sXi or snowboard body, an elastic insert imitating the flow-damping skin of a dolphin is 2039~54 integrated, whereby the turbulence~ occurring during action on the coating of the ski bottom essentially due to the melt water are compensated.
Tests run with a ski profile built in the aforementioned manner have proven this hypothesis to be correct. Skis provided with such a damping layer were considerably more rapid than comparable ski types.
Elastic inserts are actually known in ski construction. So for instance elastic insets are used to improve the ~oints in skis having steel edges made of several pieces for the elimination of movements between these edge links and the coating of the running surface (DE-OS 18 11 071), further for the vibration damping of a ski in the case of elastic layering of materials with a high modulus of elasticity (German Patent 24 34 423), as well as for improving the climbing assistance in cross-country and touring ski (DE-OS 37 23 974) Furthermore, from DE-OS 32 16 654 it is known to build in a damping plate underneath the ski hinding for shock a~sorption and finally the DE-OS 29 41 436 discloses the insertion of a rubber-like layer between the upper and the lower band of a ski, wherein twisted fiber bundles are embedded in the longitudinal direction of the ski for higher tensile strength. Thereby, on the one hand an increase of damping capability and on the other hand a better rigidity of the ski are intended. By arranging fibers in stranded bundles the damping capability of the ski is improved because the ~piral-shaped fibers in the stranded bundles are energy-absorbant.
- Besides the fact that the prior art aims at different objectîves, these known damping layers do not achieve the purpose and do not offer the solution of the present invention, which consist in improving the flow interaction between the ski body and the subctrate (snow) in a technical imitation of dolphin skin. Thereby, the coating of the running surface corresponds to the epidermis of the dolphin, the traction band corresponds to the inner membrane. In between, there is an elastic insert made of rubber or elastomer, which can be either solid, perforated or sectional. The thereby formed chamber or channels can be filled with a compressed medium (gas or liquld): suitably they are interconnected.
An elastic insert of cellular rubber or foam rubber, two rubber types which have a cellular, sponge-like structure, has proven to be particularly advantageous. Primarily, under the term of cellular rubber a product commercially available under the name NR is meant, while by foam rubber a product commercially available under the name NRB i~ meant. The Shore hardness A of these elastic inserts should suitably range between 10 and 90, preferably 35.
The proposed materials to be used can have a thickness of 0.5 to 3 mm, preferably between 1.5 and 2 mm. They are inserted between the wider legs of the steel edge section, preferably glued in. In order for these thicknesses to be practical, it is further advisable for the layered ski or snowboard body to be provided with a longitudinally running groove on the side of the traction or lower band of the ski or snowboard, wherein the elastic insert can be embedded or glued in.
Such a running surface construction can be provided in any desired length, up to the maximum of the entire ski length.
As long as the insert is made of a solid material, e.g. of cellular rubber or foam rubber, the damping of the flow turbulences occurring at the coating of the outsole takes place by displacement of the trapped air trapped in the elastic insert (cellular or foam rubber) in the same way the water particles are displaced in the damping layer of the dolphin's skin.
2039~
The elastic insert can also be structured with hollow chambers, whereby preferably the hollow spaces are interconnected.
Further, the elastic insert can be a corrugated cross section profile with hollow spaces in the longitudinal direction of the ski; in this case too the hollow spaces are preferably interconnected.
Finally, the elastic insert can present a one- or two-sided knobbed cross section profile, which is particularly advantageous when it comes to weight reduction.
. Embodiment examples of the invention are represented in the drawing, which shows:
Fig. 1 a cross section through a ski profile with a simple rubber insert of solid material, Fig. 2 a cross section through a ski profile with an insert structured as a hollow chamber, Fig. 3 a ski profile having a corrugated insert, 203915~
Fig. 4 a ski profile with knob-like configuration of the elastic insert, Fig. 5 a ski profile with a perforated elastic insert Fig. 6 a ski profile with a longitudinally running groove in the layered ski body.
In all embodiment examples, the core of the ski body is marked 1, the compression band is marked 2, the traction band is marked 3, the steel edges are marked 4 and the coating of the running surface is marked 5. Between traction band 3 and steel edges 4 the rubber insert 7 is provided.
Between the running surface 5 and the traction band 3 an elastic insert 6 i~ now embedded, preferably glued in, which in the embodiment of Fig. 1 is made of cellular or foam rubber with a Shore hardness between 10 and 90, preferably 35. This elastic insert has a thickness between 0.5 and 3mm, preferably between 1.5 and 2 mm.
In the embodiment according to Fig. 2, the elastic insert 6 is a hollow chamber profile, the hollow chambers being marked 8.
They are closed ~t their ends but have mutual connections.
In Fig. 3, an embodiment is shown wherein the elastic insert 6 is a corrugated profile. In this case too the hollow spaces of the corrugated profile are interconnected.
lgO94 In Fig. 4 an embodiment is shown wherein the damping layer has knobs on one side, so that between these knsbs hollow spaces 9 are created. These knobs can also be arranged on both side~.
The hollow spaces existing in the elastic inserts in the embodiment examples according to Fig. 2, 3 and 4, which are normally filled with air, can also be filled with a compressed liquid.
Finally, in Fig. 5 an embodiment is shown wherein the elastic insert 6 is perforated. The punched holes are marked 10.
In the embodiment of Fig. 6, the ski body is provided with a groove running in the longitudinal direction of the ski, wher~in first the lower band 3 and right next to it the elastic insert 6 are lodged. The latter can be glued in or only embedded.
With an elastic insert according to the invent$on the same effect as the one occurring in the dolphin' 6 skin as initially described, is achieved. Thereby the turbulences at the bottom side of the running-surface coating which normally consists of polyethylene are avoided to a large extent and the ski can reach higher speeds.
Claims (10)
1. Ski or snowboard consisting of several layers, whose bottom layer forming the coating of the running surface is laterally bordered by steel edges, characterized in that, for the purpose of maintaining a laminar flow around the ski during action, between the coating (5) of the running surface and the layered ski or snowboard body (1, 2, 3) an elastic and correspondingly dimensioned insert (6) imitating the flow damping skin of a dolphin is provided, whereby the turbulences occurring at the coating (5) of the running surface during action due to melt water are compensated.
2. Ski or snowboard according to claim 1, characterized in that the elastic insert (6) consists of cellular rubber or foam rubber.
3. Ski or snowboard according to claim 1 and 2, characterized in that the elastic insert (6) has a thickness of 0.5 to 3 mm, preferably 1.5 to 2 mm.
4. Ski or snowboard according to claims 1 to 3, characterized in that the elastic insert (6) has a Shore hardness A between 10 and 90, preferably of 35.
5. Ski or snowboard according to claim 1 to 4, characterized in that the layered ski or snowboard body (1) has on the side of the traction or lower band (3) a groove (11) running in the longitudinal direction of the ski, wherein the insert (6) is embedded or glued in.
6. Ski or snowboard according to claim 1 to 5, characterized in that the elastic insert (6) is designed as a hollow chamber profile, whose hollow spaces (8) are preferably interconnected.
7. Ski or snowboard according to Claim 1 to 5, characterized in that the elastic insert (6) is a corrugated cross section profile with hollow spaces in the longitudinal direction of the ski (Fig. 3), whereby the hollow spaces are preferably interconnected.
8. Ski or snow board according to claim 1 to 5, characterized in that the elastic insert 63) (sic) is a one- or two-sided knobbed profile (Fig. 4).
9. Ski according to claim 6 to 8, characterized in that the hollow spaces of the elastic insert (6) are filled with a liquid, preferably water.
10. Ski according to claim 1 to 5, characterized in that the elastic insert (6) is perforated (Fig. 5).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3927323.7 | 1989-08-18 | ||
| DE19893927323 DE3927323A1 (en) | 1989-08-18 | 1989-08-18 | Multilayer ski or snow-board - has its bottom layer forming tread surface with side steel edges, and has elastic inlay |
| DEG8915277.8 | 1989-12-30 | ||
| DE8915277 | 1989-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2039154A1 true CA2039154A1 (en) | 1991-02-19 |
Family
ID=25884143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2039154 Abandoned CA2039154A1 (en) | 1989-08-18 | 1990-07-20 | Ski or snowboard made of several layers |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0439563A1 (en) |
| JP (1) | JPH03504683A (en) |
| CA (1) | CA2039154A1 (en) |
| WO (1) | WO1991002571A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012099981A2 (en) * | 2011-01-19 | 2012-07-26 | Flow Sports, Inc. | Sports board having deformable base feature |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1111049B (en) * | 1959-07-28 | 1961-07-13 | Coleman Kramer Inc | Device to achieve a laminar boundary layer |
| CA995265A (en) * | 1973-07-18 | 1976-08-17 | Olin Corporation | Vibration damped ski |
| JPS5152038A (en) * | 1974-10-31 | 1976-05-08 | Nippon Musical Instruments Mfg | SUKII |
| JPS5498831A (en) * | 1978-01-18 | 1979-08-04 | Nippon Gakki Seizo Kk | Ski plate with characteristic variable center core |
| JPS5745021U (en) * | 1980-08-25 | 1982-03-12 | ||
| AT378479B (en) * | 1983-12-09 | 1985-08-12 | Kaestle Gmbh | SKI |
| JPS6236713A (en) * | 1985-08-09 | 1987-02-17 | Matsushita Electric Ind Co Ltd | Production of magnetic head |
| DE3723974A1 (en) * | 1987-07-20 | 1989-02-02 | Trak Sportartikel Gmbh | Ski, namely a cross-country or touring ski |
-
1990
- 1990-07-20 CA CA 2039154 patent/CA2039154A1/en not_active Abandoned
- 1990-07-20 JP JP2510416A patent/JPH03504683A/en active Pending
- 1990-07-20 EP EP19900910559 patent/EP0439563A1/en not_active Withdrawn
- 1990-07-20 WO PCT/DE1990/000553 patent/WO1991002571A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03504683A (en) | 1991-10-17 |
| EP0439563A1 (en) | 1991-08-07 |
| WO1991002571A1 (en) | 1991-03-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |