EP0761260A1 - Vibration damping device for snowboards - Google Patents

Abstract

The shock absorber (14) is fixed to the upper surface of the ski with its longest dimension longitudinal. It has a layer of visco-elastic material (15) which is covered by a plate made of material with a high modulus of elasticity. The plate is an ellipse and its central part has two holes (17) which define a straight longitudinal tongue (18). The tongue is not fixed to the board and is flexible elastically so that it acts like a leaf spring. Its ends are joined to the plate but it does not have a layer of visco-elastic material.

Description

The subject of the present invention is a vibration damping device for snowboarding, such as skiing, monoskiing or surfing.

It is known to dampen parasitic vibrations of a board for gliding on snow, in order to improve the comfort of the skier as well as the attachment of the board on hard snow, by equipping the upper face of the board. '' at least one strain plate device, that is to say comprising a layer of visco-elastic material fixed on the upper face of the board, for example by gluing, the upper face of this layer of visco-elastic material being itself integral with a stress plate with high elasticity modulus. During the flexions of the board, there is a shearing of the layer of visco-elastic material located between the upper face of the ski and the stress plate, having the effect of damping vibrations. Depending on the type of board considered, ski intended for special slalom or ski intended for giant slalom, the parasitic frequencies to be damped are different, so that the location, the size and the number of devices equipping the board are different and adapted to each case.

Document WO / 01189 describes a ski comprising, on its upper face, pressure elements arranged in front and behind the binding zone. These elements are for example constituted by elastic blades, each of which is fixed at one of its ends to the ski, and rests by its other end on the upper face of the ski or on an elastic stop associated with the latter.

Document FR-A-2 675 392 relates to a ski having the same characteristics as those described in the preceding document, with a flexion blade connected to the ski by a rigid connection, and by a flexible connection, these connections being spaced longitudinally l from each other on the bending blade.

Document EP-A-0 490 044 relates to a ski comprising a lower part or base, as well as an upper part or stiffener. The connection between the stiffener and the base is made by flexible or partially rigid means.

Document FR-A-2 701 215 relates to a ski, the upper face of which is equipped with a flexion blade connected to the ski by at least two damping means spaced apart longitudinally on the ski relative to one another.

Document FR-A-2 709 974, in the name of the Applicant, relates to a ski equipped with a plate for mounting the binding, this plate comprising a layer of visco-elastic material surmounted by a stress plate, and the plate having, in its central part, an area not attached to the ski and deformed on the side opposite to the ski, this blade undergoing, during a bending of the ski, a buckling between its ends and tending to recall the ski in an upright position, c that is, not inflected.

The object of the invention is to provide a vibration damping device for snowboarding, such as skiing, monoskiing or surfing, which is of the strain plate type, and in which the strain plate offers other possibilities. damping or elastic return of the ski in its unconstrained position.

To this end, the device which it relates to, of the “strain plate” type, of any shape and the largest dimension of which is oriented approximately longitudinally to the board, comprising a layer of visco-elastic material coated with a plate of high elastic modulus, the layer of visco-elastic material being secured on the one hand to an outer surface of the gliding board and on the other hand to the stress plate, is characterized in that the plate stress has at least one tongue-shaped zone, separated from the board over part of the width and over part of the length of the plate, this tongue being elastically flexible, and being connected to the board by its ends, so that , during the flexions of the board, it behaves like a leaf spring acting mechanically by buckling between its two ends connected to the board, while the rest of the device ag it like a visco-elastic damper with a classic stress plate.

It follows from this structure that the device provides the ski with a shear damping function of the layer of visco-elastic material, as well as an elastic return function by the mechanical buckling effect of the tongue not bonded to the ski. .

Each tab detached from the board can be an integral part of the constraint plate, or be constituted by a separate part from the latter and fixed by its ends to the end zones of the constraint plate itself fixed to the ski. . This attachment can be achieved by an irreversible bonding technique, such as bonding, welding or riveting, or by screwing, or by embedding the ends of the tongue in recesses formed in the end zones of the stress plate.

In each zone comprising a tongue detached from the board, provision may or may not be made of visco-elastic material. Insofar as there is a layer of visco-elastic material, this is fixed on the upper face of the board and not fixed on the tongue. In order to promote the mechanical buckling of the tongue, this buckling can be proriented upwards by mechanical deformation of the tongue, for example using an elastic stud mounted between the lower face of the tongue and the upper face of the board, or by mechanical predeformation of the tongue.

In order to promote the damping phenomenon, the tongue can be equipped, in its central part, and on its face turned to the side opposite to the board, with a mass-spring system tuned to a certain frequency. This system can be constituted by a cage containing a counterweight housed inside a visco-elastic product.

The disconnected tongue of the board can be straight, and oriented along the longitudinal axis of the ski or obliquely. This tab can occupy a central position relative to the plate, or be arranged laterally thereto.

The two end zones may be common for the tab detached from the plate and for the plate itself, or else the tab detached from the board may have an end zone integral with the board, but distinct from the rest of the plate .

According to another embodiment, the device comprises several tabs separated from the board, arranged obliquely to the longitudinal axis thereof, and the ends of which are integral with two longitudinal tongues integral with the board along their whole area.

According to another characteristic of the invention, on the face of the tongue detached from the board, turned towards the side opposite the ski, is fixed a layer of visco-elastic material on the other face of which is fixed a stress plate.

• Figure 1 est une vue en perspective d'un ski équipé d'un premier dispositif ;
• Figure 2 est une vue de dessus et à échelle agrandie de la partie du ski de figure 1 équipée du dispositif amortisseur de vibrations ;
• Figure 3 en est une vue en coupe transversale selon la ligne III-III de figure 2 ;
• Figure 4 est une vue en coupe transversale similaire à figure 3 d'une variante du dispositif de figure 3 ;
• Figure 5 est une vue de dessus d'un second dispositif amortisseur monté sur un ski ;
• Figures 6 et 7 sont deux vues, respectivement en section longitudinale et en section transversale, selon les lignes VI-VI et VII-VII de figure 5 ;
• Figure 8 est une vue de dessus d'une troisième forme d'exécution de ce dispositif amortisseur ;
• Figure 9 en est une vue en coupe longitudinale selon la ligne IX-IX de figure 8 ;
• Figure 10 est une vue de dessus d'un quatrième dispositif amortisseur ;
• Figure 11 en est une vue en coupe longitudinale selon la ligne XI-XI de figure 10 ;
• Figures 12, 13 et 14 sont trois vues de dessus de trois autres dispositifs amortisseurs ;
• Figure 15 est une vue en coupe longitudinale du dispositif de figure 14, selon la ligne XV-XV de cette même figure ;
• Figures 16, 17 et 18 sont trois vues de dessus de trois autres dispositifs amortisseurs ;
• Figure 19 est une vue en coupe transversale du dispositif amortisseur de figure 18 selon la XIX-XIX de cette même figure ;
• Figure 20 est une vue de dessus d'un dispositif amortisseur, dans lequel la languette désolidarisée du ski est rapportée sur la plaque de contrainte ;
• Figure 21 est une vue en coupe longitudinale de ce dispositif selon la ligne XXI-XXI de figure 20 ;
• Figure 22 est une vue de dessus d'un autre dispositif amortisseur, dans lequel la languette désolidarisée du ski est encastrée dans la plaque de contrainte ;
• Figure 23 en est une vue en coupe longitudinale selon la ligne XXIII-XXIII de figure 22.

In any case, the invention will be clearly understood with the aid of the description which follows, with reference to the attached schematic drawing representing, by way of nonlimiting examples, several embodiments of this device:

• Figure 1 is a perspective view of a ski equipped with a first device;
• Figure 2 is a top view and on an enlarged scale of the part of the ski of Figure 1 equipped with the vibration damping device;
• Figure 3 is a cross-sectional view along the line III-III of Figure 2;
• Figure 4 is a cross-sectional view similar to Figure 3 of a variant of the device of Figure 3;
• Figure 5 is a top view of a second damping device mounted on a ski;
• Figures 6 and 7 are two views, respectively in longitudinal section and in cross section, along lines VI-VI and VII-VII of Figure 5;
• Figure 8 is a top view of a third embodiment of this damping device;
• Figure 9 is a longitudinal sectional view along the line IX-IX of Figure 8;
• Figure 10 is a top view of a fourth damping device;
• Figure 11 is a longitudinal sectional view along the line XI-XI of Figure 10;
• Figures 12, 13 and 14 are three top views of three other damping devices;
• Figure 15 is a longitudinal sectional view of the device of Figure 14, along line XV-XV of this same figure;
• Figures 16, 17 and 18 are three top views of three other damping devices;
• Figure 19 is a cross-sectional view of the damper device of Figure 18 according to XIX-XIX of this same figure;
• Figure 20 is a top view of a damping device, in which the tongue detached from the ski is attached to the stress plate;
• Figure 21 is a longitudinal sectional view of this device along the line XXI-XXI of Figure 20;
• Figure 22 is a top view of another damping device, in which the tongue detached from the ski is embedded in the stress plate;
• Figure 23 is a longitudinal sectional view along the line XXIII-XXIII of Figure 22.

FIG. 1 represents a ski 2 comprising, in a manner known per se, a tip 3, a heel 4 and a central part 5 or skid zone in which is mounted a binding for a ski boot consisting of a stop 6 and a heel piece 7. Figure 3 and other figures very schematically represent this sectional ski, it being specified that the structure of the ski is given by way of illustration but is not the subject of the invention. As shown in FIG. 3, the ski comprises a sliding sole 7 bordered by two longitudinal metal edges 8, on which rest the lower edges of a shell 9 forming the side walls 10 as well as the upper wall 12 of the ski. The interior of this ski comprises a core 13, the possible reinforcing elements, both at the level of the sole 7 and at the level of the shell 9, not having been shown. However, the invention could apply just as well to skis of traditional structure, that is to say comprising longitudinal edges resting on the edges 8, or on reinforcing elements associated with the edges, these edges serving them -same supports with an upper wall produced independently.

As shown in FIG. 1, a damping device 14, of the strain plate type, is arranged between the stop 6 of the fixing and the spatula 3. Although only one damping device is shown in the drawing, it is possible, depending on the type of behavior sought for skiing and depending on the frequencies of the vibrations to be absorbed, depending on whether it is a ski more specifically intended for the practice of giant slalom or for the practice of special slalom, to position the device differently 14 or to mount several devices 14.

In a manner known per se, a damping device with a stress plate comprises a layer 15 of visco-elastic material fixed to the upper wall 12 of the ski, for example by gluing. On this layer of visco-elastic material is fixed, also by gluing, a constraint plate 16 with high elasticity modulus. The damping of the vibrations is obtained by a shearing phenomenon of the layer 15 of material visco-elastic between the upper wall 12 of the ski and the stress plate 16.

In the embodiment shown in FIG. 2, the damping device comprises a layer 15 of visco-elastic material as well as a stress plate 16 in the general shape of a hollow ellipse. The central part of the device has two recesses 17 delimiting a straight longitudinal tongue 18, which is separated from the upper face of the ski, it being specified that, as shown in FIGS. 2 and 3, there is no layer of visco-elastic material nor at the level of the recesses 17, nor under the tongue 18.

In FIG. 2, as in the other figures representing top views of other embodiments, the zones of the stress plate made integral with the ski by gluing the base of the layer of visco-elastic material are materialized by dotted lines, while the tongue 18 which is detached from the ski does not have such dotted lines.

The tongue 18 being elastically flexible, and being connected by its ends to the board, since its ends rest and are fixed on the layer of visco-elastic material 15, it behaves like a leaf spring, acting mechanically by buckling between its two ends connected to the board. As regards the rest of the device, it acts as a visco-elastic damper with a stress plate, by shearing the layer 15 of visco-elastic material between the upper wall 12 of the ski and the stress plate 16.

FIG. 4 represents an alternative embodiment of the device of FIGS. 1 to 3, in which the same elements are designated by the same references as above. In this embodiment, the layer 15a of visco-elastic material extends over the entire surface of the device, including at the level of the recesses 17, and under the tongue 18. However, the tongue 18 is not bonded to the layer of visco-elastic material 15a.

Figures 5 to 7 show another embodiment of this damping device, of a structure close to the device of Figures 1 to 3. In this case, the device designated by the general reference 19 has a general form of parallelogram, of which the two longitudinal branches are oriented in the direction of the length of the board. The two transverse branches are connected by a longitudinal tongue 20 oriented in the direction of the length of the board. This tongue 20 is detached from the ski in its central part, and is pre-deformed upwards, as shown in FIGS. 6 and 7, due to the presence on the upper face of the ski of a stud 22 made of an elastic material, this stud forming a support and ensuring the predeformation of the tongue 20 on the side opposite the ski. This arrangement orients the direction of deformation of the tongue and promotes the phenomenon of buckling during bending of the ski.

Figures 8 and 9 show another embodiment of this damping device in which the same elements are designated by the same references as above. This device, designated by the general reference 23, has a generally rectangular shape, the central part of which is hollowed out. In this central part, are arranged, between the two longitudinal branches, four tabs 24, 25, 26, 27 inclined at 45 ° relative to the longitudinal axis of the board. Two of the tabs 24, 26 are inclined in opposite directions to the other two. By this inclination, each tongue has a blade-spring effect by buckling on the one hand on simple flexions of the board, as in the previous cases, and on the other hand during deformations of the board by twisting or twisting. The 45 ° angle, given as an example, could be different, and the tabs could be pre-bent to orient the buckling.

FIG. 10 represents another embodiment of this device, in which the same elements are designated by the same references as above. In this device, designated by the general reference 28, the constraint plate and the layer of visco-elastic material have a general shape of diabolo. The tongue 29 separated from the ski is pre-deformed on the opposite side of the ski, thanks to the presence of folds 30, and carries, near its zone furthest from the ski, a cage 32 containing a counterweight 33 embedded inside a mattress of visco-elastic material. This assembly forming a mass of inertia also promotes the damping of certain vibrations.

FIG. 12 represents a damping device 34 of generally rectangular shape, in which are formed, in the layer of visco-elastic material and in the stress plate, two recesses rectangular 35 delimiting three parallel branches connected by two end zones which are perpendicular thereto. Among these three branches, one of them arranged laterally forms a tongue 36 whose central part is not integral with the ski.

FIG. 13 shows another device, similar to the device in FIG. 2, designated by the general reference 37, in which the tongue 38 separated from the ski is arranged obliquely.

FIG. 14 represents a damping device 39 similar to that of FIGS. 2 and 3 and in which the same elements are designated by the same references as in this figure. In this case, on the tongue 18 separated from the ski, is fixed a layer 40 of visco-elastic material, on the upper face of which is fixed a tongue 42 with high elastic modulus forming stress plate. It is thus possible to combine, on the same support, qualities of damping by buckling and by shearing.

FIG. 16 represents a damper device 43 which has, in top view, a shape of parallelogram. The constraint plate has, over part of its length, a longitudinal slot 44. The large surface located on one side of the slot 44 as well as the areas disposed in front and behind this slot, over the entire width of the plate, are integral with the ski, while the zone situated on the other side of the plate, in the upper part of the drawing, forms a tongue 45 which is not integral with the ski.

FIG. 17 shows an alternative embodiment of the device in FIG. 16, this new device 46 in the general shape of an ellipse, having two slots 47 formed in the stress plate, these slots 47 being central and longitudinal, extending over a part of the length of the constraint plate, and delimiting between them a tongue 48 separated from the upper face of the ski.

Figures 18 and 19 show another embodiment of this damping device designated by the general reference 49. In this embodiment, the stress plate and the layer of visco-elastic material associated therewith have the form general of an open O. From the central zone of the O extends a tongue 50 separated from the ski in its central part, and the free end of which is fixed at 52 to the ski, independently of the stress plate, by through a layer of visco-elastic material. In this way, the length of the tongue 50, corresponding to its central part separated from the board, can be much longer than the actual plywood, which has the consequence of increasing the buckling and therefore the spring effect.

In the embodiment shown in Figures 20 and 21, the damping device 53 comprises a layer of visco-elastic material and a generally rectangular stress plate having a central recess 54 also rectangular. On the upper face of the stress plate 55 are fixed, for example by welding or by bonding depending on the nature of the materials used, the ends of a tongue 56 made of a flexible material.

In the embodiment of FIGS. 22 and 23, the damping device 57 comprises a stress plate and a layer of visco-elastic material, designated respectively by the references 58 and 59, having a general shape of ellipse, with a recess central 60. In the internal face of the plate 58 are recessed portions 62 intended to allow the embedding of the ends of an elastic tongue 63 which has a predeformation on the side opposite to the ski.

These last two embodiments are advantageous, since they make it possible to produce the disconnected tongue of the ski 56, 63 from a material different from that constituting the stress plate, which makes it possible to obtain excellent elastic return properties of the part of the tongue detached from the ski.

As it goes without saying, the invention is not limited to the sole embodiments of this device described above by way of examples, on the contrary it embraces all variants. Thus, in particular, the same device could comprise several tabs separated from the ski, or even that this device could be applied to other gliding boards than a ski, for example a surf or a monoski, or even as following the geometry of the gliding board the damping device could be fixed not on the upper face substantially parallel to the sole, but on an inclined face, or on the edges of the board, without leaving the frame of the invention.

Claims (20)

Vibration damping device for snowboarding, such as skiing, monoskiing or snowboarding, of the "stress plate" type, of any shape and the largest dimension of which is oriented approximately longitudinally to the board, comprising a layer of material visco-elastic coated with a high elastic modulus stress plate, the layer of visco-elastic material being secured on the one hand to an outer surface of the gliding board and on the other hand to the stress plate, characterized in that the constraint plate comprises at least one tongue-shaped zone (18, 20, 24, 29, 36, 38, 45, 48, 50, 56, 63), separated from the board on a part of the width and over part of the length of the plate, this tongue being elastically flexible, and being connected to the board by its ends, so that, when the board bends (2), it behaves like a leaf spring acting mechanically nt by buckling between its two ends connected to the board, while the rest of the device acts as a visco-elastic damper with a conventional stress plate. Device according to claim 1, characterized in that each tongue (18, 20, 24, 29, 36, 38, 45, 48, 50) detached from the board forms an integral part of the stress plate, and is formed therein. ci by means of cutouts in the form of slots and / or recesses. Device according to claim 1, characterized in that each tongue detached from the board consists of a part (56, 63) distinct from the constraint plate and fixed by its ends to the end zones of the constraint plate, it - same fixed on the ski. Device according to claim 3, characterized in that each tab (56) detached from the board is fixed to the end zones of the plywood by an irreversible connection technique, such as gluing, welding, riveting. Device according to claim 3, characterized in that each tab (63) detached from the board is embedded and clipped by its ends in two recesses provided in the end zones of the stress plate. Device according to any one of Claims 1 to 5, characterized in that, in each zone comprising a tongue (18) separated from the board, no visco-elastic material (15) is provided between it and the upper face of the board (2). Device according to any one of Claims 1 to 5, characterized in that, in each zone comprising a tongue (18) detached from the board, there is a layer of visco-elastic material (15a) fixed on the upper face of the board, and not fixed on the tongue. Device according to any one of claims 1 to 7, characterized in that the tongue (20, 24, 29) detached from the board is preformed by bending to form a boss on the side opposite to the upper face of the board. Device according to all of claims 6 and 8, characterized in that an elastic stud (22), integral with the central part of the tongue (20) detached from the board or from the upper face of the board (2), and of thickness greater than the distance between the upper face of the board and the tongue, preforms the tongue on the side opposite to the board. Device according to any one of Claims 1 to 9, characterized in that the tongue (29) detached from the board is equipped, in its central part and on its face turned towards the side opposite to the board, with a mass system. spring (32, 33). Device according to claim 10, characterized in that the tongue (29) separated from the board is equipped, on its face turned to the side opposite the board, with a cage (32) containing a counterweight (33) embedded in the interior of a visco-elastic product. Device according to any one of claims 1 to 11, characterized in that the tongue (18, 20, 29, 36, 38, 45, 48, 50, 56, 63) detached from the board is straight. Device according to claim 12, characterized in that the tongue (18, 20, 29, 36, 45, 48, 50, 56, 63) separated from the board is oriented longitudinally relative to the board (2). Device according to claim 12, characterized in that the tongue (24, 25, 26, 27, 38) separated from the board has an oblique orientation relative to the longitudinal axis of the board (2). Device according to claim 1, characterized in that it comprises several tongues (24, 25, 26, 27) separated from the board (2), arranged obliquely relative to the longitudinal axis thereof, and whose ends are integral with two longitudinal tongues integral with the board along their entire surface. Device according to any one of claims 1 to 14, characterized in that it comprises a central tongue (18, 20, 24, 29, 38, 48, 50, 56, 63) separated from the board, arranged between two tongues integral with the board along their entire surface. Device according to any one of claims 1 to 14, characterized in that it comprises a tongue (36, 45) detached from the board, arranged on one side of two tongues integral with the board along their entire surface. Device according to any one of claims 16 and 17, characterized in that the two end zones are common for the integral tongues and for the tongue detached from the board. Device according to any one of claims 16 and 17, characterized in that the integral tongues and the tongue (50) separated from the board have a common glued end zone, while the other glued end zone (52 ) is distinct for the tabs integral with the plate on the one hand, and for the tab detached from the plate on the other hand. Device according to any one of Claims 1 to 19, characterized in that a layer (40) of viscous material is fixed on the face of the tongue (18) separated from the board (2), facing the side opposite the ski. elastic on the other side of which is fixed a constraint plate (42).

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