FR2884432A1 - INTERFACE DEVICE BETWEEN A SLIDING BOARD AND A SHOE RETENTION MEMBER - Google Patents

Abstract

The device has a wedge (72) with a transversal notch assembly (79a-79c, 80a, 80b). The notches are made in a reception zone on the entire length and height of the wedge. The notches open at two opposite sides of the wedges such that a plate presents a reception zone at the wedge blocks connected by extensible and retractable connection zones. The wedge has a row of housings for connecting a screw of the wedge at a board and a set of screws for assembling a retention unit (70) to the wedge.

Description

Interface device between a gliding board

  The invention relates to an interface device between a gliding board and a retaining element of a boot which is intended to be mounted on the gliding board. The invention also relates to a gliding board equipped with such an interface.

  In the field of alpine skiing it is common to use skis equipped with front and rear retaining element.

  To be able to adapt the spacing of the retaining elements to shoes of different sizes, and also to allow the ski to flex more freely when sliding, what is commonly called the recoil function, at least one of these elements, in general the rear element, is mounted on a slide. There may be used for a rear restraint two superimposed slide systems, one for position adjustment, the other for the recoil function, or a first system for coarse position adjustment, and the other for fine adjustment and recoil function.

  In known manner a slide for a ski comprises two sliding slide elements relative to each other, one of the elements is integrally mounted on the board and the other is associated with the retaining element. The slide element of the ski is assembled by any appropriate means including screws or by welding as taught in patent application EP448936.

  It is known to integrate in the ski structure the slide element associated with it. Patent applications WO9104770, DE3924899 or EP1329243, WO0249728 disclose solutions of this kind. However these modes of construction are not completely satisfactory. Indeed, because of their distance from the neutral layer of the ski, the slider elements which are metal elements significantly disturb the bending of the ski. And during bending, the connection zone between the slide element and the ski is subjected to very high stresses.

  Recently it has undertaken to deliver skis with a slide member already mounted on the boards so as to simplify the mounting of the retainers. The slide elements then have a less rigid structure than the previous elements, they are generally made of a plastic material and can therefore bend more easily. These slide elements are assembled to the ski by screws or they are anchored in the structure of the ski by studs which are retained in the core of the ski. As an illustration of this type of construction, mention may be made of the patent applications WO03043707, EP1424107 and EP1161972, DE10063923.

  These systems give good results, but there remains a problem induced by the bending of the ski. Indeed, to allow the ski to flex, the slide elements which are generally two parallel rails are integrally fixed to the ski at one end and fixed with a possibility of longitudinal sliding at their other end. This need for free sliding complicates the mounting of the slide element on the ski.

  A similar problem arises with the holds that are used to enhance the retainers. As a rule these wedges are assembled to the ski integrally at one of their ends and with the possibility of sliding at their other end.

  To reduce the influence of the slide element on the bending of the ski, it is known to make transverse grooves in the rails, the document DE10063923 previously cited shows such grooves. These grooves soften the flexural slide members, but do not solve the problem of relative movement when flexing the ski.

  There is also the patent application FR2763861 which describes a platform comprising at least one series of grooves of general transverse orientation opening into its upper and lower faces. According to this document, the grooves are located between the retaining elements or behind the rear element or in front of the front element. Such a provision is not totally satisfactory.

  An object of the invention is to improve the existing devices by proposing a slide element that can be assembled integrally to a gliding board along its entire length and flex with it without the need to provide a relative movement of a portion of the slide element relative to the ski.

  This aim and other objects which will become apparent during the following description are attained by the interface device according to the invention which comprises at least one elongated shim in a longitudinal direction with a lower face intended to be applied against the ski and an upper face provided to receive at least one retaining element of a shoe.

  It is characterized in that said wedge has at least one receiving zone of a retaining element and in this zone at least one set of transversal cuts, the notches being made over the entire width or height of the wedge and opening to two opposite faces of the wedge, so that the plate has at least two wedge blocks connected by an extensible and retractable connection zone.

  It is indeed in the receiving areas of the retaining elements that the effect of the cuts is desirable.

  The invention will be better understood by reference to the description below and the appended drawings attached thereto.

  Figure 1 is a general view of a set to ski.

  Figure 2 shows in perspective the shims of Figure 1.

  Figure 3 illustrates a construction variant of the shims.

  Figure 4 relates to an alternative embodiment of the invention.

  Figures 5 and 6 are alternative construction.

  Figure 7 illustrates another embodiment of the invention.

  FIG. 8 shows in side view and exploded the various elements of FIG. 7.

  Figures 9 to 12 relate to alternative construction.

  Figure 1 shows the central portion 1 of an alpine ski which is surmounted by two front and rear retaining elements of a shoe, respectively 3 and 4.

  These elements are of a known type and will not be described in detail.

  According to the illustrated embodiment, the front retaining element 3 comprises a retaining jaw 6, connected to a body 7, itself mounted on a base 8. The base 8 is extended towards the rear by a plate of support 9 which is provided to receive the shoe.

  Similarly, the rear retention element 4 comprises a jaw 11 connected to a body 12, itself mounted on a base 13. The base is extended forward by a support plate 14 for the shoe sole which serves as a support for a braking device 15. In a conventional manner, the body 12 is slidably mounted along its base 13 by a sliding system and position adjustment lock.

  Any other retaining element may also be suitable, and in particular non-releasable retaining elements.

  According to this first embodiment of the invention, the retaining elements 3 and 4 are mounted on the ski 1 with intermediate wedges 17 and 18. The wedges have a lower face which rests on the ski and an upper face having a receiving zone 171, 181 for a front or rear retaining element, respectively. The function of these wedges is for example to enhance the retaining elements and the shoe, or to channel the transmission of efforts between the shoe and the ski to change the distribution of these forces towards the edges and the gliding sole of the ski. Or the wedges are provided to facilitate the mounting of the retaining elements, that is to say that the skis are delivered to the retailer with the shims already assembled and that to finish the assembly the retailer mounts the retaining elements in one of the predefined positions at the holds.

  According to the illustrated embodiment, the wedges 17 and 18 have in top view a shape and dimensions that allow them to support the bases 8 and 13 of the retaining elements. Optionally, as shown, the shims have in the length direction a dimension greater than that of the base of the associated retaining element to be able to mount the retaining element in question in different positions.

  According to the illustrated embodiment the thickness of the shims is constant, but this is not limiting. Alternatively one could have an increasing or decreasing thickness over the length of the shims.

  In this case the wedges 17 and 18 are mounted on the ski using screws. Such screws 19a, 20a, 21a, 22a are shown diagrammatically in FIG. 1, and their respective housing 25a, 25b, 26a, 26b, and 27a, 27b, 28a, 28b are visible in FIG. 2. The number and the position of the screws are not limiting. Preferably there is for each of the shims at least three assembly screws distributed on the front and on the rear to immobilize the shim relative to the ski at least in these two areas. It will be said that the housing for the screws are arranged in rows oriented transversely and spaced longitudinally from each other, each row comprising a housing or more depending on the total number of screws.

  As a rule, the rows of dwellings are located inside the reception zone 171, or at least part of them.

  Contrary to what is usually done, the housings 25a, 25b, 26a, 26b, and 27a, 27b, 28a, 28b are adjusted to the cross-sectional dimensions of the screws, that is to say that there is no oblong housing and that the screws all ensure a local immobilization of the holds on the ski without relative slip.

  The retaining elements 3 and 4 are also assembled to the wedges by screws. Such screws 29a, 30a, 31a, 32a are shown diagrammatically in FIG. 1. And FIG. 2 shows series of holes, 33a, 33b, 34a, 34b, 35a, 35b, 36a, 36b which are pre-drilled to the upper surface of the holds. It will be said that the series of holes are arranged in rows oriented transversely and spaced from each other in a longitudinal direction. The rows of the series of holes are located inside the reception zone 171, they are preferably distinct from the rows of housings so that there is no possible interference between a housing for mounting the housing. hold on the ski and a hole for mounting a retainer on the hold.

  In a conventional manner for mounting, each of the screws is screwed into one of the holes in the series, the one corresponding to the correct longitudinal position of the retaining element.

  The number of holes per series is not imitative One could also have only one hole defining a single position of the retaining element. In the same way for what preceded, we could have series of housing.

  The holes of the series of holes are adjusted to the screw dimensions so that the screws are tightened in their respective holes and locally ensure a connection of the bases on the blocks without relative sliding. Cross cuts are locally present at the upper face and the lower face. shims in the receiving area 171. Preferably the depth of a notch is greater than half the thickness of the shim in this area, but it is not essential.

  Preferably also a notch opening to one side of the shim is located at a short longitudinal distance from at least one other opening opening to the other face of the shim. Few distance means a distance of about one centimeter. The notches are thus grouped by sets of notches which open alternately to each of the opposite face of the hold. For each shim these sets of notches delimit blocks of wedge and form between these blocks of extensible and retractable connection zones.

  The aim is to locally divert the neutral layer of the wedge so that it follows a corrugation that facilitates a retraction or longitudinal elongation of the wedge during the bending and counter-flexing movements of the ski. Also the goal is to lower locally the neutral layer of the hold so that the wedge is close to this ski.

  Preferably there is for each of the wedges at least one set of notches between two adjacent rows of housing and a set of notches at least between two adjacent rows of holes. Also preferably there is a set of notches between a row of dwellings and each adjacent row of holes. It is possible, however, to have a row of holes and a row of dwellings on the same block or two rows of holes on the same block provided that there is no row of infill housing.

  In this way for each shim, each row of holes or housings is on a separate shim block, the blocks being isolated from each other by sets of notches which form extensible or retractable zones in a longitudinal direction. The same block of wedge may carry both a row of holes and a row of dwellings or two rows of directly adjacent holes. The sets of notches allow the different blocks to move closer or away from each other during the flexing and counter-flexing ski, to follow the relative displacement of the assembly screws wedges to the ski, and these screws relative to the assembly screws of the bases on the holds, while respecting the constant spacing of these assembly screws for the same retaining element.

  Referring to Figures 1 and 2, the front spacer 17 comprises two rows of housing formed by the housing 25a, 25b, and 26a, 26b, and two rows of holes formed by the series 33a, 33b and 34a, 34b. The shim is also traversed by two sets of notches, a first set formed by the notches 37a, 37b, 37c, and a second set of notches 38a, 38b, 38c. The notches open partly to the upper face and partly to the underside of the hold. Their depth is such that for each set of notches the bottom of a notch opening on the top is lower than the top of a notch opening on the underside of the hold.

  The wedge is thus divided into three blocks 17a, 17b, 17c. The first block 17a carries a row of slots and a row of holes, the other two blocks carry a single row of slots and holes, respectively.

  In the same way the rear wedge 18 has two rows of housing formed by the housings 27a, 27b, and 28a, 28b and two rows of holes formed by the series 35a, 35b and 36a, 36b. The rows of holes and at least a portion of the rows of dwellings are in the receiving area 181.

  The two sets of notches formed by the cuts 39a, 39b 39c and 40a, 40b, 40e define three blocks 18a, 18b and 18c. The first block carries two rows, the others carry only one row of holes or dwellings.

  According to what is shown in Figure 2 the blocks that carry two rows are located at one end of the wedge towards the middle of the ski. This provision is not limiting and these blocks could be located indifferently to the middle of the holds or to the far ends of the holds.

  According to the embodiment variant shown in FIG. 3, instead of being oriented horizontally, the notches are vertical. Thus this figure represents two wedges 42 and 43, each of the wedges comprising three blocks, respectively 42a, 42b, 42c and 43a, 43b, 43c.Each block carries one or two rows of holes or housings as described above.

  The three blocks of each of the shims 42, 43 are separated by sets of vertical notches, respectively 46, 47 and 48, 49. According to the illustrated embodiment because of the notches, the transition zones between two consecutive blocks have a shape. spring blades opposed by the top. The blades allow the blocks to move away or closer together to follow the bending and counter-flexing movements of the ski.

  For the embodiments that have been described, the retaining elements are mounted on two separate shims. This is not limiting, and one could have a single shim which carries the two retaining elements each on a receiving zone carried by a wedge portion.

  To illustrate this, FIG. 4 shows a monobloc wedge 52 having a front portion 53, and a rear portion 54 joined by an intermediate portion 55.

  The two front and rear portions are constructed as the previous holds 17 and 18 and have receiving areas 531, 541 and sets of notches in each of the receiving areas.

  According to the illustrated embodiment, the intermediate portion comprises an additional set of notches which is formed by three notches 56a, 56b, 56c. This set of notches allows the intermediate portion to extend or retract with the bending and counter-flexing movements of the ski.

  Instead of a set of notches one could have a system with sliding elements or a block of deformable material such as a damping material or a viscoelastic block.

  According to the embodiment illustrated in FIG. 5, instead of being parallel the notches 57a, 57b, 57c, 58a, 58b, 58c, 59a, 59b, 59c, 60a, 60b, 60c, 61a, 61b, 61c or at least some of them are made obliquely. According to what is shown, all the notches converge towards a fictitious point situated on one side of the hold 62. This is not limiting and one could adopt any other disposition, in particular to make the notches converge towards two points located on one side and on the other side of the hold.

  According to the embodiment of Figure 6 the notches 63a, 63b, 63c, 64a, 64b, 64c, 65a, 65b, 65c, 66a, 66b, 66c of the wedge 68 are made in chevrons.

  Figures 7 and 8 illustrate another embodiment of the invention in which the retaining element is assembled to the wedge by a rail and slide system instead of being assembled with screws. In these conditions, the receiving zones comprise rails along which the retaining element is guided.

  FIG. 7 shows a front retaining element 70 mounted in this way on a shim 72, itself assembled on a ski portion 71.

  The wedge 72 has in its upper part a receiving zone 721 with two protruding lateral extensions 72a and 72b which form guide and retaining rails for the two rounded edges 74a and 74b of a plate 74 which thus forms a slideway. The retaining element 70 is assembled to the plate 74 via its base 75.

  In this way the retaining element can be moved in the receiving zone 721 in the longitudinal direction of the shim 72. Its immobilization is carried out by any appropriate known means, and for example by means of a toothed latch whose teeth are engaged in housings made in the hold or in the notches of an attached blade which is immobilized relative to the hold.

  FIG. 8 represents the three superimposed elements, the ski portion 71, the shim 72 and the retaining element 70 with its plate 74.

  As illustrated, the shim 72 is assembled to the ski 71 by screws such as the screws 76 and 77 which are visible in this figure. The screws are housed in recesses of the wedge without longitudinal play. In known manner the screws are screwed into housing drilled in the ski 71. As previously agreed, it will be said that the assembly screws are arranged in rows. In this case there are two rows, but there could be more. At least a portion of the rows are in the receiving area 721.

  Between the rows of assembly screws the shim present in the receiving zone 721 at least one set of notches. In the case shown there are two sets of notches, one formed by the transverse notches 79a, 79b, 79c and the other by the transverse notches 80a, 80b, 80c. For each set part of the notches opens on top and another part on the underside of the hold.

  It should be noted that the notches which open on the top of the hold, in this case the notches 79a, 79c and 80a, 80c, create discontinuities in the lateral extensions 72a and 72b which form the guide rails.

  The sets of notches separate the block into blocks, here three blocks 73a, 73b, 73c. Preferably it is arranged that at least one block out of two or three carries a row of assembly screws to the ski. This is determined by the length of the blocks relative to the length of the slide. In the case where one block or more is not assembled directly to the ski by screws, it is arranged so that the length of the rounded edges 74a, 74b of the plate is greater than the length of a block, so that at least a portion of the slide is engaged with a block assembled directly to the ski. The length of the blocks can vary from one block to another.

  With such a method of construction, the blocks come closer and move away from each other with the bending and counter-flexing movements of the ski while maintaining the connection between the wedge and the plate of the retaining element.

  Figures 9 and 10 show a shim associated with a front retainer, it goes without saying that one can have a similar mode of construction for a shim associated with a rear retaining element. One could likewise have a single shim associated with the two retaining elements as has been described with reference to FIG. 4.

  Also the two retaining elements could be connected by a metal blade as described for example in the patent application FR2501514 or EP1314458.

  Apart from the sets of notches, the wedge may have other notches such as notches 82 and 83 opening on the underside of the hold in order to soften the wedge flexion.

  Also, the position of the rails and slideway between the shim and the retainer could be reversed to provide a guiding system with a recessed shape at the shim and projecting at the retainer.

  Finally, recesses such as the recesses 85 and 86 visible in FIG. 7 can be provided at each of the faces of the wedge. These recesses made in the middle zone of the wedge are intended to reduce the friction between the ski and the wedge. and the slide between the rows of holes or dwellings.

  Figure 9 relates to a construction variant. According to what is shown the wedge 88 comprises two longitudinal longitudinal members 89 and 90 which are joined by a bridge 91 located towards the middle of the length of the longitudinal members. The longitudinal members are parallel, they are assembled to the ski 92 by screws housed in housings 93, 94 or by any other appropriate means, for example anchor elements reported or from the longitudinal members which are embedded in the structure of the ski 92.

  The shim 88 also carries rows of holes for assembling the retaining elements. According to what is shown, these rows are formed by series of holes 96a, 96b, 97a, 97b and 98a, 98b, 99a, 99b located on each of the housings and respectively provided for each of the retaining elements.

  As before, sets of notches separate each of the beams in blocks, each block carrying with the associated block of the other spar a row of slots and / or a row of holes in accordance with what has been described above. Thus the beam 89 is cut on the front of the bridge in three blocks 89a, 89b, 89c and the rear 89d, 89e, 89f. Similarly, the beam 90 comprises three blocks 90a, 90b, 90c on the front of the bridge and three on the rear, 90d, 90e, 90f. The notches 100a, 100b 100c for the spar 89, 101a, 101b, 101c for the spar 90 are in alignment with each other and form a set of notches. The three blocks 89a, 89b, 89c form with the three blocks 90a, 90b, 90c of the other spar a wedge portion, with a receiving zone for the retaining element. It is the same for the other part of the side members. The number of blocks, the number of sets of notches and the number of notches per set are not limiting. We could also shift the notches between the two longitudinal members to create a dissymmetry effect.

  The bridging could be located further forward or back of the spars.

  Figure 10 shows a construction variant. The wedge 104 comprises two separate longerons 105 and 106 which are assembled to the ski 108 by anchoring studs 109, 110. These anchoring studs pass through the upper layers of the ski and are embedded in the structure of the ski, particularly in the core. .

  As for the wedge of Figures 7 and 8, the beams 105 and 106 have lateral extensions 105a, 106a which form guide rails and retaining rails associated with the front and rear retaining elements.

  As in the previous case, the sets of notches separate the longitudinal members in blocks, 105b, 105c, 105d, 105e, 105f, 105g for the spar 105, 106a, 106b, 106c, 106d, 106e, 106f for the spar 106. The blocks two forward-facing spars form the front portion of the shim with a receiving area of the front retainer, the rearward blocks form the rear portion with a rear receiving area. The sets of notches are at least partly in each of the receiving areas.

  According to what is shown an anchor pad 109, 100 is associated with each of the blocks.

  This is not limiting and as previously described one could have an anchor pad every two blocks, or even every three blocks or more depending on the length of the blocks in question. One could also have two or more blocks associated with an anchor pad.

  The anchoring studs of the longitudinal members may be embedded in the structure of the ski at the time of manufacture of the ski in the mold. They can also be assembled later, for example by gluing, during a ski recovery phase.

  For previous modes of construction we could in the same way use pads instead of screws.

  According to the variant embodiment shown in FIG. 11, the sets of notches form connecting arches between the different blocks, these arches having a reduced thickness of material. Due to their reduced thickness and their curvature the arches allow the blocks to move away or closer depending on the flexion of the ski. It can be said in this case that each set of notches is formed by the meeting of two adjacent cuts opening on the same face of the hold.

  Thus, in FIG. 11, the shim 112 has four blocks 102a, 102b, 102c, 102d, separated by sets of notches, the assembly that separates the blocks 112a and 112b being formed by notches 113a, 113b, 113c, with the notches opening to the upper surface of the wedge 113a and 113c joined together.

  As before, at least one set of notches is in the receiving area of a retainer.

  For this embodiment, preferably, each of the blocks is assembled to the ski. According to what is shown, the assembly is carried out by anchoring studs 115 in the shape of an inverted fir which are derived from each of the blocks and which are intended to be embedded in the structure of the ski.

  It could also achieve the assembly using reported anchor pads or screws.

  Figure 12 relates to another embodiment in which the different blocks 122a, 122b, 122c, 122d of the wedge are assembled to the ski by gluing or welding. For example they can be welded to the ski by a welding technique as described in the patent application EP448936.

  The blocks are separated as before by sets of notches 123, 124, 125, and at least one set is in the receiving area of a retainer on the hold.

  The shims are made of any suitable material and in particular molded plastic material.

  To prevent the penetration of snow or dirt inside the cuts can be expected to fill them with a flexible material such as foam.

  Of course, the description is given only as an indication and other embodiments of the invention could be adopted without departing from the scope thereof.

  In particular the different construction or implementation variants that have been described can be combined with one another. The arrangement of the notches on the top or bottom of the holds is not limiting and can be reversed.

  In addition, the invention is not limited to the field of alpine skiing, it applies to snowboarding or generally to any gliding or rolling board having one or more retaining elements of a boot and to less a wedge interface between the shoe and the board.

Claims (9)

CLAIMS,   1- Interface device between a retaining element of a shoe and a gliding or rolling board, the device comprising at least one shim (17, 18, 42, 43, 52, 62, 68, 72, 90, 104, 112) elongate in a longitudinal direction with a lower face adapted to be applied against the ski and an upper face having at least one receiving zone (171, 172, 531, 541, 721) for receiving at least one retaining element a shoe, characterized in that said wedge has at least one set of transverse cuts (37a-37b-37c, 38a-38b-38c, 39a-39b-39c, 46, 47, 48, 49, 57a-57b- 57c, 58a-58b-58c, 60a60b-60c, 61a-61b-61c, 63a-63b-63c, 64a-64b-64c, 65a-65b-65c, 66a-66b-66c, 79a-79b-79c, 80a-c 80b-80c, 100a-100b-100c-101a-101b-101c, 113a-113b-113c), the notches being made in a receiving zone over the entire width or height of the wedge and opening at two opposite faces of the hold, so that the plate in the receiving zone, at least two wedge blocks (17a, 17b, 17c, 18a, 18b, 18c, 42a, 42b, 42c, 43a, 43b, 43c, 73a, 73b, 73c, 89a, 89b, 89c, 89d , 89e, 89f, 90a, 90b, 90c, 90d, 90e, 90f, 105b, 105c, 105d, 105e, 105f, 105g, 106b, 106c, 106d, 106e, 106f, 106g, 112a, 112b, 112c, 112d) connected by an extensible and retractable connection zone.   2- Device according to claim 1, characterized in that a set of notches (37a-37b-37c, 38a-38b-38c, 39a-39b-39c, 57a-57b-57c, 58a-58b-58c, 60a-60b-60c, 61a-61b-61c, 63a-63b-63c, 64a-64b-64c, 65a-65b65c, 66a-66b-66c, 79a-79b-79c, 80a-80b-80c, 100a-100b- 100c-101a-101b-101c, 113a-113b-113c) comprises a series of indentations opening alternately to each of the opposite faces of the wedge (17, 18, 42, 43, 52, 62, 68, 72, 90, 104 , 112).   3- interface device according to claim 1, characterized in that two adjacent notches of a set of notches (37a-37b-37c, 38a38b-38c, 39a-39b-39c, 57a-57b-57c, 58a-58b -58c, 60a-60b-60c, 61a-61b-61c, 63a-63b-63c, 64a-64b-64c, 65a-65b-65c, 66a-66b-66c, 79a-79b-79c, 80a-80b80c, 100a -100b-100c-101a-101b-101c, 113a-113b-113c) are less than one centimeter apart.   4- Interface device according to claim 1, characterized in that for a set of notches (37a-37b-37c, 38a-38b-38c, 39a-39b-39c, 57a-57b-57c, 58a-58b-58c , 60a-60b-60c, 61a-61b-61c, 63a-63b-63c, 64a-64b64c, 65a-65b-65c, 66a-66b-66c, 79a-79b-79c, 80a-80b-80c, 100a-100b -100c101a-101b-101c, 113a-113b-113c), the bottom of a notch opening to the upper face of the hold is lower than the bottom of a notch opening to the underside of the hold.   5- interface device according to claim 1 wherein the wedge has rows of housings (25a, 25b, 26a, 261), 27a, 271), 93, 94) for assembly screws of the wedge to the board and rows holes (33a, 33b, 34a, 34b, 35a, 35b) for assembling a wedge retainer, characterized in that each wedge block (33a, 33b, 33c, 18a, 281), 28c) carries a row of holes or accommodations.   6. Interface device according to claim 1 wherein the shim has in its upper part lateral extensions (72a, 72b) forming two guide rails and retaining for the plate (74) of a retaining element, characterized in that the notches (79a, 79c, 80a, 80c) which open at the upper face of the wedge create discontinuities in the lateral extensions.   7- interface device according to claim 1 wherein the shim comprises in its lower part of the anchor pads (109, 110) provided to be embedded in the structure of the board, characterized in that an anchor pad is associated to each of the blocks (105b, 105c, 105d, 105e, 105f, 105g, 106b, 106c, 106d, 106e, 106f, 106f).   8- interface device according to claim 1 wherein the wedge has two parallel longitudinal members (89, 90 105, 106), characterized in that the notches of the two longitudinal members are in alignment with each other.   9- interface device according to claim 1, characterized in that a set of notches connecting two blocks (112a, 112b, 112c, 112d) comprises notches (113a, 113b, 113c), with the notches opening to the same face of the wedge (113a and 113c) joined together so as to form a connecting arch of reduced thickness between the two blocks.