EP1952851B1 - Pair of sliding boards with binding axis angled compared to the boards axes and oriented in the same direction - Google Patents

Description

The present invention relates to gliding machines. It relates in particular to gliding machines which consist of a pair of gliding boards independent of each other and which are each attached to one of the feet of the user.

Such gliding machines are known and are generally called skis. There is a multitude of skis adapted to practice on snow, such as alpine skis, cross-country skis, skis, short skis, etc ... There are also skis adapted for practice on the snow. water, such as water skis. All skis have in common to have an elongated shape along a longitudinal axis, and to provide means participating in fixing a foot on said ski. These means participating in the fixing of a foot on the ski are placed in a central area of the ski and ensure a fixation of the foot in the longitudinal axis of the ski. All skis also have in common the fact of being used to slide in a given direction D, the axis of sliding, which is parallel to the longitudinal axis of the ski. To go in a straight line the user keeps his skis flat while maintaining his support in the center of the ski; to turn left, he moves his supports on the left side of the ski by pressing on the left edge, and to go to the right, he moves his supports on the right edge of the ski. Typically, to be able to chain the turns, the skier will pass successively from one square to the other by lateral supports. By using the joints of the ankles, knees, hips and spine, the user can easily change its support, and pass them back and forth, and vice versa, while maintaining its balance. On the other hand, the human body is not intended for lateral flexions. The ankles, knees and spine offer only a very small amount of flexion on the sides. So that, to pass his support from left to right, respectively from right to left, the alpine skier engages his whole body to the right, respectively to the left. In doing so, he places himself in lateral imbalance. This is why two poles are needed for a skier's balance, and it may be easier for him to turn when he has a high speed.

In recent years Alpine skis have appeared shorter than they were before. To ensure the skier sufficient lift, the skis have tended to widen. The limit to widening an alpine ski is directly related to the fact that the wider the ski, the more difficult it will be to turn it. Indeed, as the foot of the skier is placed transversely in the middle of the ski and the skier must move his supports on the edge inside the turn, with a wider ski, the lever arm, substantially equal to half of the width, is more important, and the efforts required to put the ski on the edge increase. In practice, we do not recommend the use of alpine skis wide small size, or people sports little.

FR-A-2660567 discloses skis having a fixing axis forming an angle with the ski axis, the angles being symmetrical for two boards of the pair.

The invention aims to provide a gliding machine that overcomes the disadvantages of the prior art. The object of the invention is in particular to provide a new gliding machine that better corresponds to human morphology.

Another object of the invention is to provide a new gliding apparatus, which allows easier and more accessible use of wide gliding boards.

The invention also aims to provide a new gliding device that ensures a better balance to the user and even at low speed.

The object of the invention is achieved by providing a pair of gliding boards, intended to be used together, without connection with each other, by a user to slide in a sliding direction, D, said pair of boards comprising a first board, which has an elongate shape along a first longitudinal axis and has first means participating in fixing the left foot of said user to said first board according to a first attachment axis; said pair of planks also comprising a second plank, which has an elongate shape along a second longitudinal axis and has second means participating in fixing the right foot of said user to said second plank along a second attachment axis; characterized in that the first axis of attachment makes with the first longitudinal axis a first angle, β1, in that the second axis of attachment makes with the second longitudinal axis a second angle, β2, in that the angle β1 and β1 angle β2 are oriented in the same direction; and in that at least one of said angles β1 and β2 is non-zero.

Preferably, the angle β1 and the angle β2 have a value between 0 ° and 30 °.

In one embodiment of the invention, the angle β1 and the angle β2 are oriented in the direction of clockwise.

In another embodiment of the invention, the angle β1 and the angle β2 are oriented in the opposite direction of the clockwise.

Advantageously, the gliding boards according to the invention are wide, even at the level of the pad, that is to say the area where the feet of the user are placed.

Preferably, the gliding boards according to the invention comprise offset side lines, that is to say that the "hollow" of the left side line and the "hollow" of the right side line are not placed longitudinally at the same level. One of the ways to achieve this effect is to fully shift the entire right edge relative to the left edge.

Moreover, in one embodiment of the invention, the contour of each of the gliding boards is defined by a closed curve passing, on the one hand, by a left spatula point and a right spatula point, both placed at level of the spatula and secondly, by a point left heel and a right heel point, both placed at the heel; the said points being further defined by the fact that they constitute concavity / convexity inversion points of the contour and by the fact that in the portion of the contour joining the left spatula point and the left heel point, called the dimension line left, respectively in the portion of the contour joining the right spatula point and the right heel point, called line of right side, the contour is always concave; said gliding board being characterized in that the line passing through the left spatula point and the right spatula point makes with said first longitudinal axis an angle δs in the clockwise direction or in the opposite direction clockwise which is not equal to 90 ° and in that the line passing the left heel point and the right heel point made with said first longitudinal axis an angle δt oriented in the same direction as δs which n ' is not equal to 90 °.

The pair of gliding boards according to the invention can be used on snow or on water.

The means participating in the attachment of the left foot and the right foot may comprise threaded inserts anchored in the gliding boards or an interface fixed on each of said gliding board; said interface being adapted to receive retaining means of a sports shoe. These means participating in fixing may also comprise a footwear device designed to receive the left foot or the right foot. These means may also include a strap designed to receive the right foot or the left foot.

While with a pair of alpine skis of the prior art, to make successive turns, the skier passes successively from one edge to the other by lateral supports, with the new gliding apparatus according to the invention, the successive passage from one edge to the other is done by front and back supports. Thus, the joints of the knees, ankles and hips will work in directions that correspond to them better, morphologically.

The feet of the user are not in the axis of the boards, or axis of the right slide. They make an angle so that the heels are closest to one of the edges and the toes are closest to the other edge. The angle that the axis of sliding with the axis of the foot is between 5 ° and 30 °.

Preferably, the two gliding boards are wide with a width at the attachment of the feet which is between 120 mm and 160 mm.

Although the gliding boards are wide, they are easy to maneuver. Indeed, because of the placement of the feet at a non-zero angle, there are always either toes or heels that are close to the edges inside the turn. To make a comparison, a pair of gliding boards according to the invention will be much easier to maneuver, and therefore much more accessible to all types of users, than a pair of skis of equal width skate.

• La figure 1 est une vue de dessus d'une paire de skis selon l'art antérieur.
• La figure 2 est une vue de dessus d'une planche de glisse d'un engin selon l'invention.
• La figure 3 est une vue de dessus d'une paire de planches de glisse selon un deuxième mode de réalisation de l'invention.
• La figure 4 est une vue d'une paire de planches de glisse selon un troisième mode de réalisation de l'invention.

The invention will be better understood in the light of the description and the drawing which accompanies it in which:

• The figure 1 is a top view of a pair of skis according to the prior art.
• The figure 2 is a top view of a gliding board of a machine according to the invention.
• The figure 3 is a top view of a pair of gliding boards according to a second embodiment of the invention.
• The figure 4 is a view of a pair of gliding boards according to a third embodiment of the invention.

The figure 1 describes a pair of skis according to the prior art. Each of the skis has an elongated shape along a longitudinal axis which is parallel to the sliding direction, D. The outline of each ski is defined as a closed curve which has the following characteristics. At the front end, the line of maximum width measured transversely to the longitudinal axis makes the separation between the spatula and the body of the ski. At the rear end of the ski, the line of maximum width measured transversely to the longitudinal axis makes the separation between the heel and the ski body. The geometry of the ski body contour, that is to say of the portion delimited by the line of maximum front width and the maximum rear width line, plays a very important role in the behavior of the ski. The left part of this outline is called the left side line, and the right side is the right side line. As a general rule, and especially for track use, the left side line and the right side line are concave. On the other hand, although there have been so-called asymmetrical skis, most of the time, the left side line and the right side line are symmetrical with respect to the longitudinal axis. In addition, even in the case where the pair of skis comprises a right ski and a left ski different from each other, the right and left skis of the ski pairs known from the prior art are always symmetrical with respect to a plane of symmetry, P. When the pair of skis is placed on the ground, this plane of symmetry, P, is a vertical plane which contains the sliding direction.

To be used, the skis are equipped with shoe retaining means, which are fixed on the skis at the level of the pad, that is to say at the level of the minimum width area of the ski. As a general rule, for each ski, a transverse line, called the "middle shoe line", MC, which is located near the minimum width line of the ski, is defined. The positioning of the retaining means of the shoes relative to the ski is such that, when the shoe is in place on the ski, the effective medium of the shoe, is close to the line "middle of shoe" MC.

On the other hand, the shoe retaining means are placed so that the foot of the user is placed in the direction of sliding. There may be shoe retaining means on a ski which comprise devices for varying the angle of the foot of the user relative to the longitudinal axis of the ski. However, these devices are designed to improve the skier's comfort in the case where the latter has articular deformities, for example when his feet make a particularly large angle with respect to each other. In addition, the adjustment of these devices ensures that the right foot position is symmetrical with the position of the left foot relative to the plane of symmetry, P.

The edges of the ski are the lower edges of the ski along the left and right side lines. When spinning, the user leans on the inside edges of the turn, ie the left edges of each skis for a left turn and the right edges for a right turn.

The figure 2 described in plan view, a gliding board according to a first embodiment of the invention. The geometry of the gliding board's contour is defined by a closed curve. This curve goes through at least four inflection points. Two of these inflection points are located near the front end of the ski, this is the left spatula point 11 and right spatula point 12. Two other inflection points are located near the rear end of the ski, it is about the left heel point 13 and the right heel point 14. The positioning of these points is such that between the left spatula point 11 and the left heel point 13, on the one hand, and between the spatula point right 12 and right heel point 14, on the other hand, there is no other point of inflection. In other words, between the left spatula point 11 and the left heel point 13, respectively between the right spatula point 12 and the right heel point 14, there is no change in the concavity / convexity of the curve. In this case, in the embodiment described in figure 2 the curve between the left spatula point 11 and the left heel point 13, respectively between the right spatula point 12 and the right heel point 14, is always concave.

The portion of the contour of the gliding board which connects the left spatula point 11 to the left heel point 13 is called left side line 15. The portion of the contour which connects the right spatula point 12 to the right heel point 14 is called the dimension line right 16. As with most skis for snow practice, the left side line and the right side line are concave. The concavity of the left and right side lines is not necessarily constant along the right line, but to ensure a healthy behavior of the gliding boards, if the concavity evolves, it evolves regularly.

The portion of the contour of the gliding board that connects the left spatula point to the right spatula point delimits the contour of the spatula 7. The portion of the contour of the gliding board which connects the left heel point to the right heel point delimits the outline of the Heel 8. The shape of the contours of the spatula and heel can take any form possible.

The front end line 18 is the line that passes through the left spatula point 11 and the right spatula point 12. This line 18 makes an angle δs with the longitudinal axis. The rear end line 19 is the line that passes through the left heel point 13 and the right heel point 14. This line 19 makes an angle δt with the longitudinal axis. The angle δs and the angle δt are both different from 90 °. These angles may be equal or not. On the other hand, these angles are anyway oriented in the same direction. In the embodiment described in figure 2 , the angle δs is oriented in the counterclockwise direction, it has a value between 5 ° and 85 °. The angle δt is also oriented in the opposite direction of the clockwise and has a value substantially equal to δs.

Since the angles δs and δt are different from 90 °, and because these angles are oriented in the same direction, there is a shift of the right side line 16 with respect to the left side line 15. this is a revolution compared to all existing skis currently. The offset before the dimension lines, Dav, is calculated as a function of the angle δs and as a function of the width of the gliding board. More exactly, the shift front of the side line, Dav, is equal to the sum of the half-width of the gliding board at the left spatula point 11, Lsg, and the half-width of the gliding board at the spatula point right 12, Lsd, all divided by the tangent of the angle δs. $$\mathrm{Dav}\mathrm{=}\left(\mathrm{Lsg}\mathrm{+}\mathrm{LSD}\right)\mathrm{/}\mathrm{tan\; \delta s}$$

In the same way, it is defined a backward shift of the dimension lines, Dar. The rear shift of the side lines is equal to the sum of the half-widths of the gliding board at the left heel point 13, Ltg, and the right heel point 14, Ltd, all divided by the tangent of the angle .delta.t. $$\mathrm{Dar}\mathrm{=}\left(\mathrm{Ltg}\mathrm{+}\mathrm{LSD}\right)\mathrm{/}\mathrm{tan\; \delta t}$$

It will be noted that the half-width of the gliding board at the left spatula point 11, Lsg, and the half-width of the gliding board at the right spatula point 12, Lsd, are respectively the maximum half widths of the gliding board at its front end, the left side and the right side. Similarly, the half widths of the gliding board at the left heel point 13, Ltg, and the right heel point 14, Ltd, are respectively the maximum half widths of the gliding board at its rear end, the left side and right side.

On the left side of the board, between the maximum half-width of the gliding board at its front end and the maximum half-width of the gliding board at its rear end, there is a half-width left minimum, Lgm. Similarly, on the right side, between the maximum half-width of the gliding board at its front end and the maximum half-width of the gliding board at its rear end, there is a right half-width minimum, Ldm.

The line where the minimum left half width, Lgm, is found corresponds to the "trough" of the left side line. Similarly, the line where the minimum right half-width, Ldm, is located corresponds to the hollow of the right-hand side line. Longitudinally, the "trough" of the left side line is further ahead than the "trough" of the right side line.

Preferably, the two gliding boards are wide with a width at the attachment of the feet which is between 120 mm and 160 mm. In general, the width at the foot attachment is slightly greater than the sum of the minimum left half width, Lgm, and the minimum right half width, Ldm.

The length of each of the sliding boards can be between 900 mm and 1700 mm, good results are obtained with lengths between 1300 mm and 1500 mm.

The figure 3 describes a pair of gliding boards according to a second embodiment of the invention, it is a pair of gliding boards for "regular" 1. The pair of gliding boards 1 comprises a first gliding board 3 intended to be fixed to the left foot of the user and a second gliding board 4 intended to be fixed to the right foot of the user. The first gliding board 3 has an elongated shape along a first longitudinal axis 5, which is parallel to the sliding direction, D, when the gliding machine is used. It is broken down into three parts, a spatula at the front end of the gliding board 3, a heel 8 at the rear end and a body 9 between the spatula 7 and the heel 8.

All that has been described for the snowboard described in figure 2 also applies to the first gliding board presented at the figure 3 and will not be repeated in the rest of the presentation. The first gliding board of the figure 3 is particularized from the gliding board of the figure 2 in that the angle δs and the angle δt are equal and in that the contour of the spatula and that of the heel are different.

The second gliding board 4 has an elongate shape along a second longitudinal axis 6, which is parallel to the sliding direction, D, when the pair of gliding boards 1 is used. For the rest, the second gliding board 4 is identical to the first gliding board 3, and all that will be said thereafter for the first gliding board 3 also applies to the second gliding board 4, unless otherwise specified.

The first gliding board also comprises means participating in fixing the left foot of the user to said first board. These means consist of a plurality of threaded inserts fixed inside the gliding board. These inserts 17 are put in place during the manufacture of the gliding board. Before using the gliding board simply mount the retainers on these inserts. According to the invention, the means participating in fixing the user's left foot to the first gliding board 3 are such as to allow the user's left foot to be fixed according to a first fastening axis 20 which makes with the first longitudinal axis 5 an angle β1 which is non-zero and which is oriented in the direction of clockwise. In practice, the angle β1 is between 0 and 30 °, and more particularly between 5 and 30 °. In the example described in figure 3 the angle β1 is equal to 12 °.

Similarly, inserts 17 are also anchored in the second gliding board 4, and they allow the attachment of retaining means of a shoe. As for the first gliding board 3, these inserts 17 are positioned in such a way that the user's right foot is fixed to the second gliding board 4 along a second fastening axis 21 which makes with the second longitudinal axis 6 a angle β2 which is non-zero and oriented in the direction of clockwise. In practice, the angle β2 is between 0 and 30 °, and more particularly between 5 and 30 °. In the example described in figure 3 the angle β2 is equal to 12 °.

The inserts 17 can receive any shoe retaining means. In particular, the safety bindings that are common in alpine skiing today will be used. We can also take different bindings, for example, telemark, Nordic hiking, ski mountaineering, cross-country skiing, fasteners with central grip and possibly non-releasable bindings in case the gliding boards are of short length .

The figure 3 describes the pair of "regular" gliding boards 1 in its position of use, that is to say respecting the relative position of the first and second gliding boards with respect to each other, when the craft glides in a straight line.

When a person must instinctively place himself in a front slot position, that is to say with one foot in front of the other, we notice that he will naturally choose to either keep the right foot more often at the back. or to keep the left foot more often at the back. The position she favors is where she feels most comfortable. She is said to be "regular" when her left foot is back and "goofy" when her right foot is in the front.

The pair of boards "regular" 1, is particularly intended for users "regular".

When sliding in a straight line with a pair of gliding boards according to the invention, the "regular" user keeps his two feet separated from each other by a distance at his convenience. The offset of the feet relative to each other is a function of a multitude of factors, for example, the height of the user, its speed, its technical level, and also the local conditions of Track.

During practice, to rotate the pair of gliding boards on the left, the user must deport his body back, rest on these heels and, to keep a good balance, put the right foot very behind the foot before. It is said that the user is in the "back" position and speaks for the turn to the left of a user "regular", a turn "back".

To turn to the right, that is to say perform a turn "front", the user comes to put the weight of his body on the toes, this movement will involve a reduction of the gap between the feet, the position " regular will still be effective, that is to say that the left foot will remain in front of the right foot.

The figure 4 describes a gliding machine according to a third embodiment of the invention, it is a gliding machine for "goofy" 2.

The "goofy" gliding apparatus 2 consists of a pair of gliding boards, each being equipped with means for retaining a shoe. It includes a first gliding board 3 intended to be fixed to the left foot of the user and a second gliding board 4 intended to be fixed to the right foot of the user. The first gliding board 3, respectively the second gliding board 4, has an elongated shape along a first longitudinal axis 5, respectively a second longitudinal axis 6, which lie parallel to the sliding direction, D, when the machine sliding is used. They are broken down into three parts, a spatula at the front end of the gliding board 3, a heel 8 at the rear end and a body 9 between the spatula 7 and the heel 8.

The first gliding board 3 and the second gliding board 4 are identical to each other. On the other hand, in the example described in figure 4 , they are symmetrical sliding boards presented at the figure 3 .

The geometry of the gliding board's contour is defined by a closed curve. This curve goes through at least four inflection points. Two of these inflection points are located near the front end of the ski, this is the left spatula point 11 and right spatula point 12. Two other inflection points are located near the rear end of the ski, it is about the left heel point 13 and the right heel point 14. The positioning of these points is such that between the left spatula point 11 and the left heel point 13, on the one hand, and between the spatula point right 12 and right heel point 14, on the other hand, there is no other point of inflection. In this case, between the left spatula point 11 and the left heel point 13, respectively between the right spatula point 12 and the right heel point 14, the left side line 15, respectively the right side line 16, is always concave .

The contour of the spatula 7, that is to say the portion of the contour delimited by the left spatula point 11 and the right spatula point 12, has, meanwhile, another point of inflection between the two previous points .

The contour of the heel 8 has a shape similar to that of the contour of the spatula 7.

The front end line 18 passing through the left spatula point 11 and the right spatula point 12 made with the longitudinal axis an angle δs, between 20 ° and 60 °. The rear end line 19 passing through the left heel point 13 and the right heel point 14, made with the longitudinal axis an angle δt, comprised between 20 ° and 60 °. Good results are obtained with the angle δs and the angle δt equal to 40 ° and oriented in the opposite direction of clockwise.

The left retaining means 22, respectively the right retaining means 23, are fixed to the first gliding board 3, respectively to the second gliding board 4, so that the left foot of the user, respectively the right foot make with the first longitudinal axis 5, respectively the second longitudinal axis 6, an angle β1, respectively an angle β2. The angle β1 and the angle β2 are non-zero and they are both oriented in the opposite direction of the clockwise. The angles β1 and β2 are equal and between 5 ° and 30 °. Good results are obtained with angles β1 and β2 equal to 12 °. When the angles β1 and β2 are equal, it is ensured that during practice, the right and left feet will remain parallel to each other. However, the equality of the angles β1 and β2 is in no way a limiting feature of the invention and it is possible to envisage gliding machines whose angles β1 and β2 are not equal. In this case the feet will no longer be exactly parallel. We can make this choice for reasons of comfort or for reasons of performance.

The figure 4 shows the footprint of the left foot 26 and the footprint of the right foot 27 of the user. The front of the left foot, respectively the front of the right foot, is close to the left edge of the first gliding board, respectively close to the left edge of the second gliding board. The rear of the left foot, respectively the back of the right foot, is close to the right edge of the first gliding board, respectively close to the right edge of the second gliding board.

The gliding device "goofy" 2, is particularly intended for users "goofy". It is used as follows: When sliding in a straight line with a "goofy" gliding machine, the user keeps his right foot in front of his left foot, the offset of the two feet one with respect to the other is a function of a multitude of factors, for example, the height of the user, its speed, its technical level, and also the local conditions of the track. To start a turn to the left, the user must bear on the edges inside the turn, that is to say the left edges of each board gliding. To do this, he tilts the weight of his body forward and therefore he brings his supports to the level of his toes. It operates a forward flexion that combines with a decrease in the offset between the right foot and the left foot. For the goofy user, the left turn is the front turn.

To be able to start a turn to the right, the user must bear on the edges inside the turn, that is to say, in this case, the right edges of each of the gliding boards. To do this, he moves the weight of his body backwards and therefore he brings his supports to the level of his heels. To keep the balance, it increases the shift between the right foot and the left foot.

The movement of the body to turn in "front" and "back" will be all the easier as the shoulders are in the axis of sliding, and not, as is the case in the practice of Alpine skiing, perpendicular to it.

When in the "front" position, the user places the weight of his body in support on the two "front" support zones 24, each of them being fixed on one of the sliding boards. For the "regular" gliding device 1, the "front" support zones 24 are placed close to the right edge, while they are placed close to the left edge for a "goofy" gliding machine 2 .

When in the "back" position, the user places the weight of his body in support on the two support zones "back" 25, each of them being fixed on one of the gliding boards. For the "regular" gliding device 1, the "back" support zones 25 are placed close to the left edge, while they are placed close to the right edge for a "goofy" gliding machine 2 .

Longitudinally, the support zones "front" 24 and "back" 25 are placed close to the lines of half-width minimum left, Lgm, and right, Ldm. In addition, if one connects between them by a straight line, the support zones "front" 24 and "back" 25, this line makes with the longitudinal axis an angle which is close to the angle δs and the angle .delta.t.

The invention is not limited to the few embodiments described here by way of example and is intended to cover any equivalent embodiment.

NOMENCLATURE

1. 1- pair of "regular" boards
2. 2- "goofy" gliding machine
3. 3- first board of glide
4. 4- second snowboard
5. 5- first longitudinal axis
6. 6- second longitudinal axis
7. 7- spatula
8. 8- heel
9. 9- body of the gliding board
10. 10- middle of shoe
11. 11- left spatula point
12. 12- right spatula point
13. 13- left heel stitch
14. 14- point right heel
15. 15- left side line
16. 16- right side line
17. 17- threaded insert
18. 18- front end right
19. 19- rear end right
20. 20- first fixing axis
21. 21- second fixing axis
22. 22- left restraint
23. 23- Right retaining means
24. 24- "front" support zone
25. 25- back support area
26. 26- footprint left
27. 27- footprint right

Claims (15)

1. Pair of sliding boards (1), designed to be used together, without being linked one to the other, by a user for sliding in a sliding direction D, said pair of boards comprising a first board (3), which has an elongate form along a first longitudinal axis (5) and has first means involved in the binding (22) of the left foot of said user to said first board (3) along a first binding axis (20);
   said pair of boards also comprising a second board (4), which has an elongate form along a second longitudinal axis (6) and has second means involved in the binding (23) of the right foot of said user to said second board (4) along a second binding axis (21);
   characterized in that the first binding axis (20) forms, with the first longitudinal axis (5), a first angle β1, in that the second binding axis (21) forms, with the second longitudinal axis (6), a second angle β2, in that the angle β1 and the angle β2 are oriented in the same direction; and in that one at least of said angles β1 and β2 is non-zero.
2. Pair of sliding boards according to Claim 1, characterized in that the angle β1 and the angle β2 have a value of between 0° and 30°.
3. Pair of sliding boards according to one of Claims 1 to 2, characterized in that the angle β1 and the angle β2 are oriented clockwise.
4. Pair of sliding boards according to one of Claims 1 to 2, characterized in that the angle β1 and the angle β2 are oriented anticlockwise.
5. Pair of sliding boards according to one of Claims 1 to 4, characterized in that the contour of said first sliding board is defined by a closed curve passing, on the one hand, through a left tip point and a right tip point, both placed at the tip, and, on the other, through a left heel point and a right heel point, both placed at the heel; said points furthermore being defined in that they constitute points of inversion of concavity/convexity of the contour and in that, in the portion of the contour connecting the left tip point and the left heel point, known as the left side line, and also in the portion of the contour connecting the right tip point and the right heel point, known as the right side line, the contour is always concave; said sliding board being also characterized in that the straight line passing through the left tip point and the right tip point forms, with said first longitudinal axis, an angle δs clockwise or anticlockwise that is not equal to 90° and in that the straight line passing the left heel point and the right heel point forms, with said first longitudinal axis, an angle δt oriented in the same direction as δs, which is not equal to 90°.
6. Pair of sliding boards according to one of Claims 1 to 5, characterized in that the contour of said second sliding board is defined by a closed curve passing, on the one hand, through a left tip point and a right tip point, both placed at the tip and, on the other, through a left heel point and a right heel point, both placed at the heel; said points furthermore being defined in that they constitute points of inversion of concavity/convexity of the contour and in that, in the portion of the contour connecting the left tip point and the left heel point, known as the left side line, and also in the portion of the contour connecting the right tip point and the right heel point, known as the right side line, the contour is always concave; said sliding board being also characterized in that the straight line passing through the left tip point and the right tip point forms, with said second longitudinal axis, an angle δs clockwise or anticlockwise that is not equal to 90° and in that the straight line passing the left heel point and the right heel point forms, with said second longitudinal axis, an angle δt oriented in the same direction as δs, which is not equal to 90°.
7. Pair of sliding boards according to one of Claims 1 to 6, characterized in that said means involved in binding the left foot and the right foot comprise a plurality of threaded inserts.
8. Pair of sliding boards according to one of Claims 1 to 6, characterized in that said means involved in binding the left foot and the right foot comprise an interface fixed on each of said first and second sliding boards; said interface being provided in order to receive means for holding a sports boot.
9. Pair of sliding boards according to one of Claims 1 to 6, characterized in that said means involved in binding the left foot to said first sliding board and also the right foot to the second sliding board comprise a shodding device provided in order to receive the left foot or the right foot.
10. Pair of sliding boards according to one of Claims 1 to 6, characterized in that said means involved in binding the left foot to said first sliding board or the right foot to the second sliding board comprise a strap provided in order to receive the left foot or the right foot.
11. Pair of sliding boards according to one of Claims 1 to 10, characterized in that it is used to slide over snow.
12. Pair of sliding boards according to one of Claims 1 to 10, characterized in that it is used to slide over water.
13. Sliding device comprising a pair of sliding boards according to one of Claims 1 to 12, characterized in that it comprises a pair of holding means, each of said holding means being fixed to one said sliding board.
14. Pair of sliding boards according to either of Claims 5 and 6, characterized in that the angle δs and the angle δt are between 5° and 85°.
15. Pair of sliding boards according to one of Claims 5, 6 or 14, characterized in that the angle δs and the angle δt are substantially equal.

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