JPS6331230B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for strapping shoes to skis for Langlauf (distance) skiing, ie cross-country skiing.

Currently available Langlauf skis, i.e. cross-country ski boots, are increasingly designed with means for laterally guiding and retaining the heel; It should allow for an unfolding movement of the foot that remains as far as possible in the longitudinal axis of the ski, thereby ensuring better guidance of the ski itself. For this purpose, several types of configurations are known that provide heel retention. That is, in the first embodiment, the guiding and holding means is a V-shaped centering recess formed in the lower longitudinal direction of the heel of the shoe, and a V-shaped protrusion disposed on the ski is inserted into this recess. is accommodated. The main drawback of this solution is that the centering of the shoe on the ski takes place only at the final stage of the foot's unfolding movement when the foot is resting on the ski. This kind of centering, which occurs only in the last 10 millimeters of movement, is desirable, especially with large deformations of the sole due to torsion, since it does not prevent the foot from performing off-center movements, especially on uneven ground. It may happen that the V-notch in the sole cannot fit into the corresponding convex part on the ski. At best, the skier must center his heel on the V-shaped ridge of the ski himself. Such spontaneous attempts to center can lead to a loss of balance, a loss of speed and thus a loss of time, which is particularly disadvantageous when playing competitions.

Other types of construction use rigid projections, triangular in shape and placed on the top surface of the ski, to control the movement of the foot when the foot reaches the final stage of its deployment movement and when the foot comes to rest on the ski. This allows the protrusion to dig into the area of very soft material located under the opposing heel. In this case, in addition to the disadvantage that no centering takes place, the same disadvantages as mentioned above are found. because,
This is because when the foot unfolds, the protrusion enters the soft part of the heel without any forced guidance for the foot and without the foot remaining stationary on the ski. Finally, there are features that serve to guide the shoe onto the ski during all stages of the foot's deployment movement. However, this device
It is necessary to provide a guide member which extends perpendicularly to the ski and which, during the unfolding movement of the foot, is at least as high as the lifting height of the foot. This device, which works according to its principle, has the disadvantage, on the one hand, of being unaesthetic and, on the other hand, of being relatively bulky. Furthermore, although it can be fitted to the shoe itself, in practice it also requires a bulky guide device. Such a device is important not only in terms of the weight that the assembly has, but also in terms of its size (particularly with regard to the part that can be adapted to shoes, where it would be difficult to walk without skis). It becomes a hindrance for the wearer.

The object of the invention is to carry out Langlauf and/or cross-country skiing, in which the centering of the sole is advantageously carried out with respect to the longitudinal axis of the ski and its upper surface during all stages of the foot development movement. By creating ski shoes for
The object of the invention is to overcome the drawbacks of various types of constructions in the prior art. According to another advantageous feature of the invention, this object is achieved by using measures of reduced size and weight that work reliably under all conditions of use. For this purpose, means for holding the shoe laterally on the ski include a coupling that allows the heel of the shoe to be lifted from the upper surface of the ski by known means located at the front of the shoe. extends substantially longitudinally with respect to the shoe, at least in a region located directly below the instep;
and one part of said lateral retention means is located directly below the shoe and the other part is located on the upper surface of the ski, these two parts being in common during all stages of the foot development movement during skiing. A device for fastening a shoe to skis is realized, which is characterized in that it includes a cross-sectional contour of complementary shape that ensures a secure action.

According to a first embodiment of the invention, the sole is made of a flexible but wear-resistant material.
A Langlauf ski or cross-country ski shoe comprising, in the instep area, at least one groove extending generally longitudinally from the tip of the shoe to at least below the metatarsal area where the flexing area of the sole is located. Realized. The shoe made in this way cooperates with a convex shape corresponding to the groove arranged on the upper surface of the ski, so that when the shoe is connected to the ski via the binding, the convexity The engagement of the groove within the groove causes the groove and the protrusion to cooperate. This cooperation occurs not only when the sole is completely stationary on the ski, but also when the foot lifts forward during the walking motion of Langlauf skis, the cooperation between the grooves and the convex portions becomes smaller. This is also done when only a portion is involved. Therefore, when the foot returns to its flat position on the ski in the final stage of its unfolding movement, the cooperating part gradually restores its surfaces to full contact and to this substantially longitudinal guidance. This ensures lateral retention of the shoe on the ski. In this first embodiment of the invention, the cooperating part is constructed with a complementary shaped cross-sectional contour that allows the projection to be fixed longitudinally on the ski, so that it is already mounted on the ski. There is no need to make very complex positioning adjustments to existing bindings.

According to a second embodiment of the invention, a shoe is realized having a sole extending over its entire length and comprising a substantially longitudinal recess cooperating with a corresponding projection located on the ski. Ru. This type of construction ensures a lateral retention of the foot relative to the ski during all stages of the foot's deployment movement, so that the sole can actually receive constant guidance. Moreover, the arrangement of the recess directly beneath the sole over its entire length has the advantage of allowing guidance of the shoe and facilitating its introduction into the binding. As in the previous case,
The cooperating part is constructed with a constant cross-sectional profile.
Nevertheless, without departing from the scope of the invention, said cooperating parts may be constructed with a contour of variable cross-section, such that the foot moves towards its final stage (the moment when the foot comes to rest on the ski) and the unfolding movement. Accordingly, the contact surface of the cooperating part may be increased to the maximum in order to provide an optimal guiding effect for skiing in the snow. Of course, the cross-sectional profile may have various shapes without departing from the scope of the invention. That is, they may be polygonal or circular. Similarly, in order to effectively maintain the guidance of the sole and the ski, the cooperating part can also be provided with laterally arranged snow removal notches on both sides of the part, whereby the cooperating part The working area will be free of snow or ice. These notches can be placed on the sole of the shoe or
Although they may be arranged independently on the projections arranged on the ski, it may be advantageous to provide them on the two elements mentioned above. Finally, in addition to the so-called "centering side" or "guiding side", the guide of the shoe on the ski is created by forming a cross-sectional profile that includes two sides whose cross section is perpendicular to the upper surface of the ski. It also becomes possible to improve the lateral retention. In this way, a cooperating part is obtained which brings about a significant improvement in the lateral retention means according to the invention. Depending on the configuration, the holding area (together with its vertical sides) is arranged independently, for example above or below the guiding area of the projection located on the ski. According to a particular embodiment of the co-operating part that connects the guiding area and the holding area, a convex part is created which is arranged on the ski and which comprises perpendicular ridges on both sides, from which the said ridges are formed by means of an inclined generatrix. Ribs extending vertically connect the top of the ridge to the upper surface of the ski. This design has the advantage of providing guidance and lateral holding at a minimum height. It should be noted here that the shoe as well as the ski can advantageously be provided with a plurality of these lateral retention means arranged parallel to each other between the two parts, for example between the ski and the shoe.

According to a third embodiment of the invention, the cooperating parts of the shoe and ski maintain a constant height, while lateral retention means having a variable cross-sectional contour are realized. These cross-sectional contours represent, for example, a volume with a constant thickness, the bases of which are similar triangles, the largest base being on the upper surface of the ski,
The height of this large triangle coincides with the longitudinal axis of the shoe on the ski. In this type of configuration, the reduced height of the convex profile provides progressive guidance and lateral retention, which helps to hold the leg posteriorly in preparation for the subsequent gait. During the deployment phase of the foot in the required passive extension, the convex contour acts as a wedge in the sole, and also acts like a herringbone pattern (for example on a tractor tire). do. It is clear that this constructional aspect can be implemented over the entire length of the underside of the shoe sole, like one of the various aspects described above, with the aim of obtaining the same advantages. Generally speaking, a person skilled in the art will be able to create any one of the configuration aspects described above, without departing from the scope of the invention, the configuration that seems most advantageous to him from the point of view of performance and/or ease of use. It is understood that more than one may be combined with each other. Therefore, for example, it is not always necessary to make a convex part arranged on a ski as a single body; on the contrary, it is not necessary to make a convex part disposed on a ski as a single body; on the contrary, it is possible to arrange a plurality of convex parts coaxially on an extension line of each other, and to create a free space between the parts. Leaving gaps is permitted within the scope of this invention. Finally, if the convex part is arranged on the sole and the recess is arranged on the ski, it is not excluded from the scope of the invention to provide lateral retention means, for example between the shoe and the ski. .

According to a fourth embodiment of the invention, lateral retention means are furthermore provided which are located particularly in the sole tip region of the Langlauf ski boot. Langlauf
During locomotion on skis, the foot tilts forward and the foot receives a slight support between the sole and the upper surface of the ski, localized by the contact area from the binding means to the toe support area. The lack of lateral retention of the foot is greatest when only the surface remains.
This lack of lateral retention of the foot in position is particularly dangerous immediately after the foot has returned to the ski. It is therefore important to guide the foot along the longitudinal axis of the ski back to a flat position on the ski with maximum efficiency and in a single movement.

For this purpose, the device for binding shoes for Langlauf skis or cross-country skis further comprises a sole contact area from the binding means to the support area of the toes for binding the shoe to the ski. comprising lateral retention means extending generally longitudinally with respect to the shoe, the lateral retention means cooperating with each other and configured with complementary shaped contours whose volume decreases from the front to the rear of the shoe. It consists of parts.

The invention will be better understood and become clearer by reference to the following description and accompanying drawings, in which: FIG.

FIG. 1 shows an assembly for binding a Langlauf ski boot 3 to a ski 1 via a binding 2 of known type. A feature of the assembly constructed in this way is that the sole 4 of the Langlauf ski boot 3 has a longitudinal cross-section, for example triangular, in the front part 4a of the sole located under the instep area of the skier. It has a directional groove 5. This groove 5 is formed in an area corresponding to the support area of the instep.
The cross section disposed on the ski cooperates with a triangular longitudinal protrusion 6, so that when the skier's foot deploys, the two parts, the concave part and the convex part, fit into each other. . The cooperation between the ski and the shoe through the concave portion and the convex portion permanently guides the shoe against the ski and holds it laterally at all stages of the foot deployment movement. ensure that In fact, these co-operating parts 5 and 6, according to the arrangement of the invention, are located in the front area of the sole when the foot is in a passively extended position (a stage in which the foot is essentially supported on the toes). to the area of the sole corresponding to at least the midfoot and tarsal supports of the foot when the foot is placed on the ski. This area of the wider foot is progressively created by the centering of the lateral holding means (in the case of FIG.
Because of the continuous guidance, the risk of the arch arching due to uneven competition courses or skiing areas is further reduced, and a side-slipping phenomenon of the heel 4c relative to the upper surface 1a of the ski is therefore avoided.

In a second embodiment shown in FIG. 2, a Langlauf ski shoe 30 is provided in which the assembly of the device according to the invention can be used on any type of Langlauf ski, i.e. cross-country ski shoe. Other types of bindings 20 are included to demonstrate what is possible. In this case, a concave portion 50 under the sole 40 and a convex portion 60 cooperating with the concave portion 50
The lateral retention means consisting of extend unbroken over the entire length under the sole 40 from the tip region 40b to the heel region 40c, cooperating with a binding 20 of known type. Therefore, not only is the guidance of the shoe advantageous during all stages of the foot deployment movement, but this arrangement also makes it easier for the skier to engage the shoe in the binding 20 before guiding the shoe 30. enable. It will be seen that in the embodiments described above, the complementary shaped cooperating parts have a generally constant triangular cross-section over their entire length. Nevertheless, these certain cross-sectional shapes may vary as shown in FIGS. 4, 5, 6, and 11. That is, these figures show various shapes of cooperating protrusions that may be used without departing from the scope of the present invention, provided that a recess of complementary shape is provided directly below the sole of the shoe. . However, the first
The two embodiments described in connection with the figures and FIG. change over time. The illustrated cooperating portions 600, 610 each include a cross section 601, 611, which cross section is larger than the preceding surface and said cooperating portion 600, 6
Surfaces 601', 61 located near the rear end of 10
It increases towards 1'. Due to this cross-sectional change,
As the shoe rests on the ski, the mating surfaces of the two complementary cooperating parts increase, which can advantageously increase the lateral retention of the shoe.

Finally, FIG. 9 shows a possible refinement for entering the protrusion 620 into the corresponding V-shaped groove of the sole according to the invention. In fact, said convex portion 620
A notch 621 is cut on a converging wall 622 that widens towards the base of the shoe, thereby displacing snow or ice that has accumulated in the groove of the sole as the protrusion enters the recess. can do. It goes without saying that this type of shaped notch can also be applied to other types of protrusions. It is likewise possible to arrange such a notch perpendicularly to the recess in the sole. In the embodiments shown in FIGS. 1 and 2, it is also possible to advantageously use lateral retention means in which the cross-sectional shape of the cooperating part has an area perpendicular to the upper surface of the ski. (Fig. 6, Fig. 10, Fig. 11). In this configuration,
Two main functions are required of said lateral retention means, namely guidance or centering in the first step of the entry of the cooperating projections 6'', 630, 640 into the corresponding cooperating recesses; In the second and final step, lateral retention of the recess fitted into the projection is advantageously achieved.For example, in the case of FIG. of the cooperating part located directly below said upper triangular part 7'', and then, as the sole moves relative to the ski, as the sole develops relative to the ski. The vertical walls 8'', 9'' are accommodated in corresponding concave parallelepiped sections of the sole. In the cooperating convex portion 640 shown in FIG.
It functions similarly to the previous case, except that it is located above 44. In this case, the ridge 641 firstly contacts the inclined wall of the guiding triangular part located at the entrance of the groove of the sole to ensure the guidance of said sole;
It then ensures a continuous unfolding movement of the sole relative to the ski, so that the vertical side walls 642, 643 of said ridge 641 are accommodated within the concave rectangular cross-section area of said sole.

In the case of FIG. 10, an advantageous arrangement of the cooperating protrusion 630 is such that the part with vertical walls for the lateral holding function and the triangular (or nearly triangular) cross-sectional part for the guiding function are located at a predetermined height. The assembly is adjusted according to the specified value. For this purpose,
The protrusion 630 consists, for example, of a central web 631 at a constant height and perpendicular to the ski. Perpendicular to the central web 631 and from its vertical walls 632, 633, a rib 634 extends transversely from the top 636 of the web to the base of the protrusion 630 along a generatrix 635. . The advantage of this type of construction is that not only the guiding and lateral retention functions are performed by the central web 631 and the transverse ribs 634, respectively, but also that the corresponding complementary part of the sole fits onto said protrusion 630. When mating, this same rib ensures a supporting stop for starting the walk.

FIG. 3 shows, on the one hand, a binding 2 of known type and, on the other hand, a cooperating recess 500 provided in the instep region of a sole 400 according to the invention.
A particular type of binding device for fastening a Langlauf ski boot 300 to a ski 1 using a retaining means consisting of a complementary protrusion 610 fixed in a corresponding relationship on the ski. An embodiment of the invention is shown.

As before, the axis of said retaining means is arranged in the longitudinal direction of the shoe. In this embodiment, the cooperating protrusion 610 is defined by a triangular major base surface adjacent to the ski and a similarly triangular minor base surface preferably spaced from this base surface by a certain height. It is advantageous to form it as a solid body of limited volume. These two base surfaces then form inclined side walls 612, 6 as shown in FIG.
12', the cross section of said solid body 610 varies along a rearwardly increasing plane, for example from 611 to 611'. Complementary thereto, cooperating recesses 500 of the same volume are formed and arranged in the sole. The advantages of this type of construction are obvious. That is, even though the height of the convexity is reduced, as the foot is developed onto the ski, guidance and centering are progressively obtained and lateral retention is increased. Moreover, as already mentioned, during the unfolding movement of the foot, a support stop is obtained for the next start of walking which is proportional to the amount of surfaces of the cooperating parts 500, 610 that are in contact with each other. It is possible, without departing from the scope of the invention, to extend these cooperating parts from the area of the flexible lamella that fits into the binding 2, for example into the area of the heel 400c.

12 and 13 show possible construction combinations for a binding device according to the invention. The binding device shown in FIG.
In the instep area of 01, it includes two lateral retention means arranged parallel to each other, but in the heel area, it has a larger shape than the two parallel first lateral retention means, One centering V-shaped member, known per se, is provided. shoes 700
is in a position to return flat on the ski 1, as indicated by arrow 708. The lateral retention means located in the instep area of the sole 701 include two protrusions 703 with a V-shaped cross section arranged parallel to each other.
It is defined by two longitudinal grooves 702 with a V-shaped cross section in the sole cooperating with the sole. At every stage in which the shoe attempts to return flat on the ski, the shoe is forced into contact with the heel 7, which is also provided with a groove 704.
06 has already been guided and centered at the instep so that it is finally centered at the moment it comes into contact with the protrusion 705 with a V-shaped cross section fixed to the upper surface of the ski. I understand.

The binding device shown in FIG.
0 has a longitudinal groove 802 of arbitrary cross-section disposed on its lower surface over the entire length of the bottom 801, with which a plurality of cooperating protrusions 803, which are integrally fixed to the ski, are provided. work These cooperating protrusions 803 form a series of discontinuous longitudinal contact surfaces, which are advantageous from the point of view of reducing the weight of the device. Despite this discontinuity,
Guidance and centering of the sole 801 is always ensured during the unfolding movement of the foot, as indicated by the various positions 804 (dot-dashed line) and 805 (dashed line) of the shoe.

14 to 16 show a device for fastening a Langlauf ski boot 3 onto a ski 1 via a binding 2 of a known type. A feature of the device constructed in this way is that the sole 4 of the Langlauf ski shoe 3 extends at its front end 4a from the end 4a of the sole at least into the supporting area of the sole corresponding to the toe. in that it has an extending longitudinal groove 5.

This groove 5 extends over the entire length of the sole on its underside. This groove 5 having a triangular cross section is
When the shoe 3 is fixed on the ski 1, the contact area 4a of the sole from the binding to the toe support area
It cooperates with a projection 6 of complementary shape to said groove fixed on the ski in an area corresponding to the groove. Therefore,
The protrusion 6 is immediately adjacent to the binding 2 so that the recess 5 and the protrusion 6, which constitute the lateral holding means, fit into each other when the skier's foot makes a deployment movement. In fact, even when the foot is in a passive extended position, i.e. when the foot is supported in particular on the toe, the cooperating parts 5, 6 are located in this toe support area, so that the sole of the shoe A cooperative relationship between the end and the ski is ensured. According to the invention, this cooperative relationship changes the cross-sectional contour of these parts, with respect to the protrusion 6, to a large base 6b in its front part.
(triangular cross section in the illustrated case) is located on the side of the binding 2, and the small base 6c is formed by a part of a truncated cone or truncated pyramid 6a located toward the rear of the shoe. Therefore, it can be realized even better. Therefore, also, to be precise, the 16th
When the sole is in the position of minimal contact with the ski during the phase of passive extension of the foot shown in the figure, this guidance and lateral retention of the sole is maintained from the beginning of the flat return phase of the foot onto the ski. It's just happening.
A front portion 6a whose cross section decreases toward the rear of the convex portion 6
may be extended rearward by a prismatic or cylindrical portion 6d having a constant height.

Accordingly, from FIG. 15 it can be seen that the front end area 4a of the sole 4
is centered on the ski with maximum efficiency, determined by the fact that the cross-sectional contour of the cooperating parts 5, 6 has a cross-sectional volume that decreases from the front to the rear, thereby reducing the impact of the sole relative to the ski. It becomes clear that maximum guidance and centering is obtained with minimum contact area.

17 and 18 show advantageous embodiments of the adaptation of the binding device of the invention to Langlauf ski boots and bindings of the type currently available on the market.

Langlauf ski shoes 10 having soles 12 of standard type 35, standard "Lin" type, standard type 50, etc.
is attached to the ski 1, and the sole end 1
It is fixed to the ski by a binding 11 of a type corresponding to the standard No. 2a. The device made in this way, similar to the previous example, has a recess 14 with respect to the minimum contact surface of the sole 12 on the ski 1.
In order to ensure maximum cooperation between the sole and the protrusion 13, it includes lateral retention means located in the front end area of the sole. In this case, a conical or pyramidal convexity 13 located on the longitudinal axis of the ski is provided, which convexity is located in the center of the width of the tongue constituting the end 12a of the sole 12. It cooperates with a corresponding conical or pyramidal recess 14 located therein. From these conical or pyramidal lateral holding means extend in the longitudinal direction portions 13a, 14a with triangular cross section. These parts, which are respectively convex and concave and have a triangular cross-section substantially smaller than the cross-section of the cones or pyramids 13, 14, at the stage of the return of the foot to a flat position on the ski (indicated by arrow 15) From the outset, it is ensured that the centering and guiding achieved by the co-operation of the parts 13, 14 with one another is continuous. Advantageously, the recess 14 is open to allow snow that has entered into it to be expelled.

In the case of this illustration, the embodiment of the device according to the invention is not limited to conical recesses and convexities, the volume decreasing from the front to the rear and having a maximum center at the point of minimum contact of the sole on the ski. All shapes that allow mating are quite reasonable and within the scope of the invention.

FIGS. 19 to 22 furthermore show two possible variants of a projection 16, 17 which is arranged under the front end area of the sole and cooperates with a corresponding recess provided in the sole. .

In particular, in FIGS. 21 and 22, the convex portion 1
The front part 1 has a cross section that decreases towards the rear of 7.
7b may have a prow 17a which engages a corresponding groove in the sole when the sole is in the stage of returning to a flat position on the ski.

The invention can only find its full advantages by combining the lateral retention means provided in the front region of the sole with lateral retention means extending also under the midfoot region or under the heel region. That is clear.

[Brief explanation of the drawing]

FIG. 1 shows a binding according to the invention in which the sole, shown in bold lines, includes a part of lateral retention means arranged in the instep region and a complementary part of said means arranged on the ski; A perspective view of the device. FIG. 2 shows the invention in which the sole includes a portion of lateral retention means disposed on its underside over the entire length of the sole, and a complementary portion of said means is disposed on the ski; FIG. FIG. 3 shows that the sole includes a portion of a lateral retention means disposed in the instep region having a contour of constant height but varying cross section, and a complementary portion of the retention means; FIG. 6 is a perspective view of yet another embodiment of a binding device for binding shoes to skis, which is disposed on skis; 4 to 11 are perspective views showing various types of cooperating projections for lateral holding means that can be arranged on the upper surface of a ski. 12th
1 is a perspective view of a binding device including a particular arrangement with a plurality of lateral retention means provided along the entire length of the sole, showing the shoe about to be lowered onto a ski; FIG. FIG. 13 is a partially sectional side view showing another modified embodiment of a binding device for binding shoes to skis. FIG. 14 is a perspective view of essential parts showing another modified embodiment of the binding device according to the present invention. FIG. 15 is a partially longitudinal side view showing the front of the shoe secured flat in the use position on the ski by the binding device of FIG. 14; FIG. 16 shows the permanence of the cooperative relationship between the shoe and the ski by means of lateral retention means located in the front end area of the sole;
FIG. 4 is a schematic side view of the binding device of FIG. 4; FIG. 17 is a perspective view of a binding device according to the invention installed in a commercially available Langlauf ski boot. FIG. 18 is a partially longitudinal side view of the front part of the shoe shown in FIG. 17, showing a possible variant embodiment of the binding device of the invention as applied to a commercially available Langlauf ski shoe; Figures 19 and 20
The figures show a side view and a plan view, respectively, of a variant embodiment of the holding means of the binding device according to the invention. Figures 21 and 22 are, respectively,
FIG. 7 is a side view and a plan view showing another modified embodiment of the holding means. Explanation of the symbols of the main parts, likes...1, bindings...2, 11, 20, shoes...3, 10, 3
0,300,700,800, recess...5,1
4, 14a, 50, 500, 702, 802, protrusion...6, 6', 6'', 13, 13a, 16, 1
7,60,600,610,620,630,6
40,703,705,803.

Claims (1)

[Claims] 1. Complementary shaped cross-sectional contours to ensure co-operation with each other, one part being provided under the sole and the other part being provided on the upper surface of the ski so that the shoe can be skied. A device for strapping a Langlauf or cross-country ski boot to a ski board, comprising means for lateral retention on the board, said lateral retention means 5, 6; 13, 13a, 1
4, 14a; 16, 17, 17a, 17b are areas located directly below the instep, and are arranged so as to extend substantially in the longitudinal direction of the shoe 3, 10, and the cross-sectional contour of the complementary shape is A device characterized in that it has a volume that decreases from the front to the rear of the shoe. 2. parts 5, 14 of said lateral retention means with a concave cross-sectional contour are arranged below the sole 4, 12, and parts 6, 16 of said lateral retention means with a convex cross-sectional contour;
17. The device according to claim 1, wherein the ski 17 is arranged on the upper surface of the ski 1. 3. The parts 6, 16, 17 of said lateral retention means with a convex cross-sectional contour are arranged under the sole 4, 12, and the parts 5, 14 of said lateral retention means with a concave cross-sectional contour are arranged on the ski 1. 2. The device according to claim 1, wherein the device is arranged on the top surface of the device. 4. Device according to claim 1, characterized in that the complementary cross-sectional contours of the two cooperating parts constituting the lateral holding means consist of cylindrical parts. 5. The device according to claim 4, wherein the cylindrical portion has a semicircular cross section. 6. Device according to claim 1, characterized in that the complementary cross-sectional contours of the two cooperating parts constituting the lateral holding means consist of truncated conical sections. 7. The device according to claim 6, wherein the truncated conical portion has a semicircular cross section. 8. Device according to claim 1, characterized in that the complementary cross-sectional contours of the two cooperating parts constituting the lateral retention means have a polygonal cross-section. 9. Device according to claim 8, characterized in that the complementary cross-sectional contours of the two cooperating parts consist of prismatic parts. 10. Device according to claim 8, characterized in that the complementary cross-sectional contours of the two cooperating parts consist of pyramidal parts. 11 The complementary cross-sectional contours of the two cooperating parts constituting the lateral retention means are at least two parallel to each other and perpendicular to the plane of the sole and of the ski on which the sole rests. 9. Device according to claim 8, characterized in that it has a polygonal cross section, including the sides. 12. A device according to claim 1, characterized in that a plurality of said lateral holding means are arranged parallel to each other in the longitudinal direction. 13 The complementary cross-sectional contours of the two cooperating parts are
2. Device according to claim 1, each having a V-shape, the surfaces of which decrease from front to rear. 14. Device according to claim 1, characterized in that the complementary cross-sectional contours of the two cooperating parts are curved, the surfaces thereof decreasing from front to rear. 15. Claims characterized in that, of the convex portion having a cross-sectional profile that decreases toward the rear, the side portion with the largest cross-sectional area has a beveled prow shape that engages with a corresponding groove in the sole of the shoe. The device according to paragraph 1.