DD238726A5 - GUIDANCE APPARATUS OF A SHOE, AND SHOE AND SURFACE ADJUSTED TO THIS DEVICE - Google Patents

Abstract

Device for lateral guidance of a cross-country ski boot, which is fastened at its front end on a cross-country ski, wherein the device in the upper part of the cross-country skiing a Fueрungsrippe and in the shoe sole has a groove which is approximately in the same distance as the Fuehrungsrippe runs and these gradually covered in the mass, as the movement of the foot takes place on the ski area. The object is to design the device so that it ensures excellent lateral guidance of the cross-country ski boot and ensures excellent grip of the skier's foot when the foot is on the cross-country ski. This is achieved in that the guide rib (3), which protrudes from the upper part of the side (2a) of the cross-country ski (2), forms a single piece with the cross-country ski (2) itself. Fig. 1

Description

For this 8 pages drawings

Field of application of the invention

The invention relates to a device for lateral guidance of a cross-country ski boot, which is attached at its front end on a ski, especially a cross-country ski, and the paragraph is free to move at least in a more vertical direction, wherein the device upper part of the cross-country ski includes a guide rib and in the shoe sole a groove which runs approximately in the same distance as the guide rib and this gradually covers to the extent that the movement of the foot takes place on the ski area, and a cross-country ski which is arranged so that the lateral guidance is ensured.

Characteristic of the known technical solutions

There are already numerous devices known which make it possible to secure the lateral guidance of a cross-country ski boot with respect to the ski. Some of these devices include a longitudinal guide rib which is mounted on the cross-country ski and cooperates with a groove of the same shape with which the shoe sole is equipped to secure the lateral guidance of the shoe in its movement, that is, when this shoe even is placed on the ski, wherein the guide rib or the (longitudinal) centering extends along the sole support zone. Such a guide device is described in FR-PS 2443853. This guide device, which comprises a central, longitudinal, placed on the ski rib, has the disadvantage that for the attachment of this guide rib on the ski, a manual operation is additionally required, which also also the foot of the skier too high above the snow located.

Object of the invention

The aim of the invention is a simple construction of their device for lateral guidance of a cross-country ski boot.

Explanation of the essence of the invention

The invention is based on the object, a device for lateral guidance of a cross-country ski boot on a cross-country ski, which is attached to its front end on a cross-country ski and the paragraph is free to move at least in the vertical direction, the device comprising a guide rib in the upper part of the cross-country ski and a groove in the sole of the shoe which runs approximately in the same distance as the guide rib and covers it gradually as the foot moves on the ski surface in that it ensures excellent lateral guidance of the cross-country boot and ensures excellent grip of the skier's foot when the foot is on the cross-country ski.

This is inventively achieved in that the guide rib, which protrudes from the upper part of the side of the cross-country ski, with the cross-country ski itself forms a single piece.

The straight line of the guide rib is constant or variable in the longitudinal direction.

The horizontal dimensions of the guide rib decrease or increase gradually backwards to.

The vertical dimensions of the guide rib increase or decrease backwards to gradually.

In a further embodiment, the straight path of the guide rib has the shape of an isosceles trapezium, a curved one

Shape or the shape of a triangle. _ - - - - -

The guide rib is bounded on each side by an oblique side surface which extends across a support surface to the narrow side of the cross-country ski. The support surface is flat, curved or horizontal.

The support surface is tilted forward or backward.

The inclined side surface of the guide rib has the same inclination or a variable inclination along this guide rib.

The side surface of the guide rib is formed by a curved surface having the same radius of curvature or a variable radius of curvature over its entire length.

In another embodiment, the upper surface of the guide rib is connected to a vertical surface perpendicular to the support surface by a flat, triangular surface and then by a cylindrical surface, which in turn is bounded by two horizontal and longitudinal generatrix, the upper generatrix

is common to the flat surface and represents one of the sides of the triangle forming it, while the other longitudinal, lower generatrix is common to the vertical surface.

The upper surface of the guide rib comprises a plurality of sections of different width in the front, a front rectangular section of large width, then an intermediate section in the form of a flat trapezium and then a rear rectangular section of small width, each of these sections of the upper surface by inclined surfaces, have the corresponding inclinations, is connected to the support surface.

The side surface of the guide rib is formed by successive surfaces or edges.

The upper surface of the guide rib is interrupted by at least one depression.

The guide rib is formed as a support for a front extension of a cross-country ski boot or a bending plate, which is attached to the cross-country ski boot and embedded in a binding. The front extension or flexure plate are held in the cross-country ski by a single screw, which is screwed centrally in the guide rib

The cross-country ski boot is characterized in that the sole has a central longitudinal groove defining two side ribs which is engageable with a central guide rib which is integral with the cross-country ski. The depth of the groove is greater than the height of the guide rib, so that the bottom of the groove is held at a small distance from the upper surface of the guide rib when the shoe is placed on the ski.

The depth of the groove may be smaller than the height of the guide rib, so that the shoe is supported on the upper surface of the guide rib by the bottom of its groove.

The lateral edges of the side ribs of the shoe sole are not formed wider than the narrow sides of the cross-country ski. The inner side rib of the sole is interrupted at a location of the sole arch and forms a seat which is engageable with a projection on the cross-country ski.

The cross-country ski is characterized in that it has at least a portion of the length of its upper side a longitudinal guide rib, which forms a single piece with the cross-country ski and represents a guide member for a cross-country ski boot.

The guide rib can be obtained by molding out simultaneously with the rest of the cross-country ski, or by machining, that is, by removing material from the upper side of a cross-country ski made with an initial thickness equal to that of Sum of the height of the guide rib and the strength of the finished cross-country ski

The guide rib has a lateral projection which extends laterally toward the interior of the cross-country ski.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing show:

1 is a perspective view of a device for lateral guidance of a cross-country ski boot, wherein the shoe in

a position is shown in which the heel of the foot of the skier is raised; Fig. 2: a perspective view on a larger scale of the part of the cross-country ski, with a longitudinal rib

is provided for lateral guidance; Fig. 3: a cross-sectional view of the sole of a cross-country ski boot, which is placed on the part of the cross-country ski, where the

longitudinal guide rib is provided for lateral guidance; FIG. 3A: a variant of the cross-sectional view shown in FIG. 3; FIG. Figs. 4 to 11 are perspective views of different embodiments of the longitudinal guide rib for lateral

Guide; Fig. 12: the elevation of three cross-country skis on which the longitudinal guide rib for lateral guidance over

extending different lengths; Fig. 13: the elevation of a cross-country ski boot with a front extension, by means of the invention

Device that is kept on a cross-country ski; FIG. 14 shows the section XIV-XIV of FIG. 13; FIG. Fig. 15 is a partial elevational view of the front part of a cross-country ski boot, which on the cross-country ski through a

Bending plate is held; Fig. 16: the section XVI-XVI of Fig. 15;

Fig. 17 is a cross-section through a ski provided with a guide rib; Figs. 18 to 24 are perspective views of embodiments of the guide rib; Fig. 25 is a perspective view of the device with a part of the ski; Fig. 26: a bottom view of the ski and the shoe; FIG. 27 shows a variant of the cross section shown in FIGS. 3 and 3 A; Fig. 28: the bottom view of a shoe for the device according to the invention; FIG. 29 shows the bottom view of a further variant of the sole; FIG. Fig. 30: a cross-country ski in plan view;

Fig. 31 is a perspective view of the portion of the ski that receives the cross-country ski boot; FIG. 32: a perspective view of another embodiment of the guide rib; ._. FIGS. 33 and 34: perspective views of two variants of the ski according to the invention.

Fig. 1 shows a cross-country ski boot 1, which is fixed at its front end by means of a suitable fastening intermediate piece of known type, not shown, on a cross-country ski 2, wherein the heel of the cross-country ski boot 1 is free to at least in vertical direction, whereby the movement of the foot forward is possible, as shown by the arrow F (Fig. 1). The "roll-up" is transmitted by raising the heel (or vice versa), the "rolling movement" of the foot is transferred by the flat placing the cross-country ski boot 1 on the cross-country ski. 2

The device according to the invention, which is intended to secure the lateral guidance of the cross-country ski boot 1 during its course of movement, that is to say its level reciprocation on the cross-country ski 2, comprises a longitudinal guide rib 3 which is in line with the cross-country ski. Ski 2 forms a single piece and jumps out of the upper side 2a of this cross-country ski 2. Therefore, the upper surface 5 of the guide rib 3 is at a certain distance above the upper side 2a of the cross-country ski 2.

The guide rib 3 may be formed together with the rest of the cross-country ski 2 or may be obtained by machining by excavating material from the upper side 2a of the cross-country ski 2.

In the embodiments illustrated in FIGS. 1 to 3, the guide rib 3 represents a constant straight path in the form of an isosceles trapezium. In other words, the width χ 1 of the front end of the upper planar surface 5 is equal to the width x2 of the rear end thereof upper surface 5. This upper surface 5 therefore has a rectangular shape in the plane.

In addition, the guide rib 3 is bounded on each side by an inclined side surface 6, which is connected to a horizontal support surface 7, which in turn extends to the narrow side 2b of the cross-country ski 2, wherein in the plane of the upper side 2a of the cross-country ski 2 or approximately in this plane, the side surface 6 and the support surface 7 therefore form a V-position with an obtuse angle. The width X1 of each horizontal support surface 7, its height h1 below the plane of the upper surface 5 of the guide rib 3 and the inclination angle a 1 of the oblique side surface 6 of the guide rib 3 with respect to the vertical have the same values at the front end of the guide rib 3 corresponding dimensions y 2; h2; a2 at the rear end of this guide rib 3.

With the guide rib 3 a longitudinal groove 8 cooperates, which is provided in the sole 9 of the cross-country ski boot 1 (FIG. 3). This longitudinal groove 8 has in straight line about the same shape as the guide rib 3, that is, that it has the shape of an isosceles trapezium. The longitudinal groove 8 provided in the lower surface of the sole 9 covers the central guide rib 3 when the cross-country ski boot 1 is in the course of its movement at the end of the "rolling period." The oblique side surfaces 8a of the groove 8 in FIG Shape of a trapezoid gradually slide in the course of the movement of the foot on the oblique side surfaces 6 of the guide rib 3, so as to ensure the centering of the cross-country ski boot.The longitudinal and central groove 8 therefore limited in the sole 9, two side ribs 10, the each fit each other in the guide rib 3.

The cross-country ski chair carries at the end of the "rolling off" of the foot preferably solely by the two side ribs 10, which are supported by their lower horizontal surfaces on the respective horizontal support surfaces 7, the cross-country ski 2. In other words, the depth the groove 8 is larger than the height of the guide rib 3, and therefore the bottom 8b of the groove 8 is at a short distance to the top surface 5 of the guide rib 3. This corresponds to the case where the height h1 or h2 of the guide rib 3, the It should also be noted that the outer side edges 100 of the side ribs 10 in the plane of the narrow sides 2 b of the cross-country ski 2. In such a device, the lower part of the shoe sole does not exceed the width of the cross-country ski 2.

3A illustrates a variant in which the bottom 8b of the groove 8 of the sole 9 is supported on the upper surface 5 of the guide rib 3. There is therefore a clearance between the lower surfaces of the side ribs 10 of the sole 9 and the horizontal support surfaces 7.

In a variant of the embodiment shown in FIG. 4, the guide rib 3 has a profile to be reduced toward the rear, in other words, its trapezoidal straight path gradually reduces towards the rear. Thereby, the upper surface 5 of the guide rib 3 has the shape of an isosceles trapezium converging to the rear, that is, its width χ 1 at its front end is larger than its width x 2 at its rear end. The width y1 of the horizontal support surface 7 is smaller at its front end than the corresponding width y2 at its rear end. The height h 1 of the guide rib 3 is at the front end equal to the height h2 at the rear end and the inclination angle a 1; a2 of the side surface 6 have the same values.

5, the guide rib 3 also has a profile that decreases toward the rear (x1> x2, y1 <y2, a1 = a2), but the support surface 7 no longer lies horizontally. On the contrary, it is inclined from top to bottom, front to back: in other words, the height h 1 between the front end of the upper surface 5 and that of the support surface 7 is smaller than the height h 2 between the rear end of the upper surface 5 and the rear end of the support surface

7. The support surface 7 therefore terminates at its rear end slightly below the plane of the upper side 2a of the cross-country ski 2, by forming a vertical approach 4 at this point.

In the embodiment shown in Figure 6, the guide rib 3 still has the rear decreasing profile (x1> x2), the side surface 6 still has the same inclination (al = a 2), the support surface 7 is from top to bottom, of inclined to the front (h Kh 2), but it has a constant width (y1 = y2).

In the embodiment shown in Fig. 7, the guide rib 3 has the same characteristics as that of Fig. 6 (x1> x2; y1 = y 2; h Kh 2), but the inclination of the inclined side surface 6 varies from the front in magnification in other words, the inclination angle α1 is smaller than the inclination angle a2. The inclination angle a1, which defines the inclination of the inclined side surface 6,

which, in turn, limits the guiding rib 3, may vary from a value of zero: in this case, the side surface 6 is perpendicular to the supporting surface 7.

In the embodiment shown in Figure 8, the upper surface 5 of the guide rib 3 with the support surface 7, which is preferably inclined from top to bottom and from front to rear, by a curved surface 11, over its entire length the same radius of curvature or having a variable radius of curvature, and connected by a vertical surface 12 to the support surface 7. Since the upper surface 5 of the guide rib 3 has the shape of a trapezium converging to the rear, the curved surface 11 has been formed by arcs of the same radius of curvature, the length of which, however, increases from front to rear.

In the embodiment shown in Fig. 9, the upper surface 5 of the guide rib 3 by a flat surface 14 of triangular shape which tapers pointed forward and then connected by a cylindrical surface 15 with the vertical surface 12 which is perpendicular to the support surface 7 , The cylindrical surface 15 is defined by two horizontal and longitudinal generatrix 15a; 15b, wherein the upper generatrix 15a is common to the surface 14 and represents one of the sides of the triangle forming it, while the other longitudinal lower generatrix 15b is common to the vertical surface 12b. In the embodiment shown in Fig. 10, the upper surface 5 of the guide rib 3 from front to rear comprises several sections of different width, namely in front a front rectangular section 5a large width, then an intermediate portion 5b in the form of a flat trapezium and then a rear rectangular section 5c narrow width. Each of these sections 5a; 5b; 5c of the upper surface 5 is defined by inclined surfaces 6a; 6b; 6 c, which have corresponding inclinations, connected to the support surface 7.

FIG. 11 illustrates the embodiment of a progressive profile guide rib 3, that is, its straight line increases from front to back: in this case, the width x1 of the horizontal upper surface 5 at the front end is smaller than the width x2 of this surface 5 their rear end. This arrangement is exactly the opposite of that shown in Fig. 4. In the same way, all embodiments of Fig. 5; 6; 7; 8th; 9 and 10 are reversed with the rear replacing the front and vice versa.

Fig. 12 shows that the guide rib 3 can extend only over a small length Ades cross-country ski 1, over a greater length B or even over the entire length C of the cross-country ski 1. This length should be sufficient to allow the use of different shoe sizes 1A; 1 B to allow.

13 and 14 show the support and guidance of a cross-country ski boot 16 with a front extension 17. In this case, the extension 17 of the cross-country ski boot 16 can also be held laterally by the guide rib 3 formed in the cross-country ski 2.

Figs. 15 and 16 show the application of the device for supporting and guiding a cross-country ski boot provided with an attachment. In this case, the cross-country ski boot 18 is extended at its front end by a bending plate 19, which in turn is held immovable by a fastening 21. At this point, the bending plate 19 can still be held laterally by the guide rib 3.

Under the conditions that only a single screw 200 is provided, the lateral support must be ensured by the guide rib 3 for connection to the cross-country ski 2. The screw 200 is screwed in the middle in the guide rib 3. Fig. 17 shows a cross section of a cross-country ski 2, which has a variant of the guide rib 3, according to which each side surface 6 of the guide rib 3 is formed by a longitudinal cylindrical surface. Fig. 18 shows a perspective view of a guide rib 3 with a cylindrical surface.

According to the embodiments described above, the horizontal support surfaces 7 and the side surfaces 6 are flat surfaces, but they may also be formed differently, as shown in FIGS. 19 and 20. In Fig. 19, each support surface 7 is a curved convex surface. In Fig. 20, it is the side surface 6 curved toward the outside of the cross-country ski 2 and convex. The side surface 6 could of course also be concave, as shown in Fig.21.

FIGS. 22 to 24 show further variants of the guide rib 3. According to these variants, the guide ribs 3 are more or less interrupted, but it is clear that they effectively ensure the lateral support of the cross-country ski boot 1. According to the embodiment according to FIG. 22, the cross-country ski 2 has a guide rib 3, which on each of its side surfaces 6 comprises lateral cavities 60, which are longitudinally separated from one another by intermediate spaces. The side surface 6 is therefore formed by successive simple surfaces 600 separated from each other by the cavities 60.

Fig. 23 shows a similar variant as described with reference to Fig. 22. In this embodiment, each side surface 6 of the guide rib 3 has, in plan view, the shape of a kinked line formed by a succession of teeth and triangular cavities separated from one another by successive edges 62.

According to the embodiment of Figure 24, the guide rib 3 is interrupted by successive cavities or depressions 61 which extend transversely across the upper surface 5 of the guide rib 3 and emerge therefrom. 25 and 26 show the device according to the invention, and in particular a cross-country ski boot 1, which is held by a cross-country ski 2, which has a guide rib 3, as shown for example in Figure 4.

Fig. 27 is a similar to Fig. 3 and 3 A cross-section. According to this embodiment, the guide rib 3 is bounded on each side by a chamfer as a side surface 6 extending from the upper surface 5 of the guide rib 3 to a narrow side 2 b of the cross-country ski 2 in such a way that, in contrast to the above embodiments, no horizontal support surfaces 7 are present, the corresponding cross-country ski boot 1 is the same as it has already been described.

Fig. 28 is a bottom view of the embodiment of a shoe according to the invention in which the side ribs 10 of the sole have successive recesses 101 leading to the interior of the central groove 8.

29 to 31 show a variant according to the invention, in which the longitudinal guide rib 3 is extended to one side, over a part of its length, by a lateral projection 300

 This projection 300 advantageously extends to the interior of the cross-country ski 2 down to the vertical of the inner

Narrow side 2b. On the other hand, the inner side rib 10 of the corresponding cross-country ski boot 1 at one point

Sohlenwoelbüng interrupted to form a seat 110, which is intended to receive the projection 300 of the guide rib 3 when the foot is just placed on the cross-country ski 2.

Fig. 29 is a bottom view of the sole 9, while Fig. 30 is a plan view of the cross-country ski 2.

Fig. 31 is a perspective view showing the cross-country ski 2 at a location where the foot must be to be supported.

Fig. 32 is a perspective view of a shape variant of the guide rib 3 in which this is a straight line in the form of a

has isosceles triangle which tapers upwards so that the upper surface 5 of the guide rib 3 therefore decreases and represents only one edge.

FIG. 33 shows a cross-country ski 2 according to the invention, while FIG. 34 shows another variant.

The position of the guide ribs 3 can also be reversed, that is, the front part can be to the rear and

Claims (36)

Invention claim: 1. A device for lateral guidance of a cross-country ski boot, which is attached at its front end on a cross-country ski and the paragraph is free to move at least in the vertical direction, the device in the upper part of the cross-country ski a Guide rib and in the shoe sole comprises a groove which extends approximately in the same distance as the guide rib and this gradually covers the extent to which the movement of the foot on the ski surface, characterized in that the guide rib (3), which from the the upper part of the side (2 a) of the cross-country ski (2) protrudes, with the cross-country ski (2) itself forms a single piece. 2. Device according to item 1, characterized in that the straight line of the guide rib (3) is constant. 3. Device according to item 1, characterized in that the straight line of the guide rib (3) is variable in the longitudinal direction. 4. The device according to item 3, characterized in that the horizontal dimensions of the guide rib (3) gradually decrease towards the rear. 5. The device according to item 3, characterized in that the horizontal dimensions of the guide rib (3) gradually increase towards the rear. 6. Apparatus according to item 3 or 4, characterized in that the vertical dimensions of the guide rib (3) decrease gradually towards the rear. 7. Device according to item 3 or 4, characterized in that the vertical dimensions of the guide rib (3) gradually increase towards the rear. 8. Device according to one of the items 1 to 7, characterized in that the straight line of the guide rib (3) has the shape of an isosceles trapezium. 9. Device according to one of the items 1 to 7, characterized in that the straight line of the guide rib (3) has a curved shape. 10. Device according to one of the items 1 to 7, characterized in that the straight line of the guide rib (3) has the shape of a triangle. 11. Device according to one of the items 8 to 10, characterized in that the guide rib (3) on each side by an oblique side surface (6) is limited. 12. The device according to item 11, characterized in that the oblique side surface (6) on a support surface (7) away to the narrow side (2 b) of the cross-country ski (9) pulls away. 13. The device according to item 12, characterized in that the support surface (7) is flat. 14. The device according to item 12, characterized in that the support surface (7) is curved. 15. The device according to item 13 or 14, characterized in that the support surface (7) is formed horizontally. 16. The device according to item 12 or 13, characterized in that the support surface (7) is inclined forward or backward. 17. The device according to item 11,15 or 16, characterized in that the oblique side surface (6) of the guide rib (3) along this guide rib (3) has the same inclination. 18. Device according to item 11,15 or 16, characterized in that the oblique side surface (6) of the guide rib (3) along this guide rib (3) has a variable inclination. 19. The device according to item 11,15 or 16, characterized in that the side surface of the guide rib (3) by a curved surface (11) is formed, which has the same radius of curvature or a variable radius of curvature over its entire length. 20. The device according to item 11,15 or 16, characterized in that the upper surface (5) of the guide rib (3) with a support surface (7) vertical vertical surface (12) by a flat, triangular surface (14) and then is bounded by a cylindrical surface (15) which in turn is bounded by two horizontal and longitudinal generatrixes (15a; 15b), the upper generatrix (15a) being common to the planar surface (14) and being one of the sides of the triangle, which it forms while the other longitudinal lower generatrix (15b) is common to the vertical surface (12). 21. The device according to item 11,15 or 16, characterized in that the upper surface (5) of the guide rib (3) from front to rear comprises a plurality of sections of different width. Device according to item 15, characterized in that the upper surface (5) of the guide rib (3) has a large-width front right-angled section (5a), then an intermediate section (5b) in the form of a flat trapezium and then a rear rectangular section (5). 5c), each of said portions (5a; 5b; 5c) of the upper surface (5) being connected to the support surface (7) by inclined surfaces (6a; 6b; 6c) having corresponding inclinations. 23. Device according to one of the items 1 to 22, characterized in that the side surface (6) of the guide rib (3) by successive surfaces (600) or by successive edges (62) is formed. 24. Device according to one of the items 1 to 23, characterized in that the upper surface (5) of the guide rib (3) is interrupted by at least one recess (61). ^: 25. Device according to one of the items 1 to 24, characterized in that the guide rib (3) is designed as a support for a front extension (17) of a cross-country ski boot (16). 26. Device according to one of the items 1 to 24, characterized in that the guide rib (3) is designed as a support for a bending plate (19) attached to the front of the cross-country ski boot (18) and embedded in a fastening (21) is. 27. The device according to item 25 or 26, characterized in that the front extension (17) of the cross-country ski boot (16) or the bending plate (19) are held in the cross-country ski (2) by a single screw (200), which is screwed in the middle in the guide rib (3). Cross-country ski boot, characterized in that the sole (9) has a central longitudinal groove (8) which has two lateral ribs (10) delimited with a central guide rib (3) connected to the cross-country ski (2). forms a single piece, is engageable. 29. Cross-country ski boot according to item 28, characterized in that the depth of the groove (8) is greater than the height of the guide rib (3). 30. Cross-country ski boot according to item 28, characterized in that the depth of the groove (8) is smaller than the height of the guide rib (3). 31. Cross-country ski boot according to one of the items 28 to 30, characterized in that the lateral edges (100) of the side ribs (10) of the shoe sole are not wider than the narrow sides (2 b) of the cross-country ski (2) are formed. 32. Cross-country ski boot according to any one of items 28 to 31, characterized in that the inner side rib (10) of the sole (9) is interrupted at a position of the sole arch and forms a seat (110) provided with a projection (300). on the cross-country ski (2) is engageable. 33. Cross-country ski, characterized in that it comprises at least a portion of the length of its upper side (2a) a longitudinal guide rib (3) which forms a single piece with the cross-country ski (2) and a guide member for cross-country skiing -Skischuh represents. 34. Cross-country ski according to item 33, characterized in that the guide rib (3) is formed together with the rest of the ski. 35. Cross-country ski according to item 33, characterized in that the guide rib (3) is formed by hollowing out the ski material. A cross-country ski according to any one of items 33 to 35, characterized in that the guide rib (3) has a lateral projection (300) extending laterally toward the inside of the cross-country ski (2).