EP0275805B1 - Tennis racket - Google Patents

Tennis racket Download PDF

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Publication number
EP0275805B1
EP0275805B1 EP87420349A EP87420349A EP0275805B1 EP 0275805 B1 EP0275805 B1 EP 0275805B1 EP 87420349 A EP87420349 A EP 87420349A EP 87420349 A EP87420349 A EP 87420349A EP 0275805 B1 EP0275805 B1 EP 0275805B1
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Prior art keywords
racquet
absorbing
fixed
plane
racket
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EP87420349A
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German (de)
French (fr)
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EP0275805A1 (en
Inventor
Pierre Antoine Movilliat
Yves Piegay
Gilles Du Gardin
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Skis Rossignol SA
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Skis Rossignol SA
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Priority to FR8618458A priority Critical patent/FR2608444B1/en
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Publication of EP0275805A1 publication Critical patent/EP0275805A1/en
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    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/54Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations

Description

  • La présente invention se rapporte à une raquette de jeu de balle, plus particulièrement destinée au jeu de tennis, cette raquette étant pourvue d'un dispositif d'amortissement des vibrations.The present invention relates to a ball game racket, more particularly intended for the game of tennis, this racket being provided with a vibration damping device.
  • Les qualités de jeu d'une raquette sont détermines par un assez grand nombre de critères que l'on peut, en général, classer en deux catégories :
    • les critères de performance : rendement, nervosité, raideur, etc.
    • les critères de confort du joueur : douceur, maniabilité, etc.
    The playing qualities of a racket are determined by a fairly large number of criteria which can, in general, be classified into two categories:
    • performance criteria: performance, nervousness, stiffness, etc.
    • the player's comfort criteria: softness, maneuverability, etc.
  • Certains critères, par exemple la tolérance au décentrage d'impact de balle, peuvent toutefois entrer dans les deux catégories.Certain criteria, for example tolerance to decentering ball impact, can however fall into both categories.
  • Ces deux catégories de critère sont le plus souvent antinomiques, de sorte que, la plupart du temps, on ne peut améliorer le confort qu'au détriment des performances et vice-versa.These two categories of criteria are most often contradictory, so that, most of the time, comfort can only be improved at the expense of performance and vice versa.
  • On sait qu'un système soumis à une perturbation vibre autour d'une ou plusieurs fréquences propres qui sont caractéristiques de sa structure et résultent de sa distribution de masse et de raideur. Le comportement résultant de cet ensemble de vibrations est la somme des déplacements qui sont générés, dans diverses directions, par les fréquences de résonance de cette structure. Ces déplacements sont minimaux aux endroits appelés couramment "noeuds" de vibration, et maximaux aux endroits appelés couramment "ventres" de vibration.It is known that a system subjected to a disturbance vibrates around one or more natural frequencies which are characteristic of its structure and result from its distribution of mass and stiffness. The behavior resulting from this set of vibrations is the sum of the displacements which are generated, in various directions, by the resonant frequencies of this structure. These displacements are minimum at the places commonly called "nodes" of vibration, and maximum at the places commonly called "bellies" of vibration.
  • Ce comportement vibratoire serait infini en l'absence de toute propriété amortissante de la structure. D'une manière générale tout système physique est soumis à un ou plusiers types d'amortissement tant que l'énergie y est dispersée soit par friction, soit par d'autres systèmes dissipatifs, par exemple visco-élastiques, ou à hystérésis.This vibratory behavior would be infinite in the absence of any damping property of the structure. In general, any physical system is subjected to one or more types of damping as long as the energy is dispersed there either by friction, or by other dissipative systems, for example viscoelastic, or hysteresis.
  • On a pu montrer que, dans le cas du joueur de tennis, les vibrations qui lui sont transmises par l'intermédiaire de sa raquette après un impact de balle sont directement corrélées à sa perception du comportement de son engin. Dans la gamme de fréquence allant de 0 à 1000 Hz, gamme dans laquelle l'homme est fortement réceptif aux vibrations, les raquettes de tennis vibrent selon plusieurs directions et fréquences, qui correspondent à ce qu'il sera dans la suite convenu d'appeler "modes vibratoires propres". C'est ainsi qu'om a pu mettre en évidence sept modes vibratoires propres fortement corrélés au comportement en jeu de la raquette :
    • trois se situent dans une direction perpendiculaire au plan de la raquette ; ce sont les modes de flexion simple perpendiculaires au plan longitudinal médian de la raquette ;
    • deux se situent dans le plan de la raquette ; ce sont les modes de flexion latérale ;
    • deux autres sont des couplages entre des vibrations de flexion perpendiculaire au plan longitudinal médian de la raquette, et de torsion par rapport à son axe longitudinal médian.
    It has been shown that, in the case of the tennis player, the vibrations which are transmitted to him via his racket after a ball impact are directly correlated to his perception of the behavior of his machine. In the frequency range from 0 to 1000 Hz, range in which humans are highly receptive to vibrations, tennis rackets vibrate in several directions and frequencies, which correspond to what will later be agreed to be called "clean vibration modes". This is how om was able to highlight seven specific vibrational modes strongly correlated to the behavior in play of the racket:
    • three lie in a direction perpendicular to the plane of the racket; these are the simple flexion modes perpendicular to the median longitudinal plane of the racket;
    • two are in the plane of the racket; these are the modes of lateral flexion;
    • two others are couplings between vibrations of flexion perpendicular to the median longitudinal plane of the racket, and of torsion with respect to its median longitudinal axis.
  • A titre d'illustration de quelques-uns de ces modes vibratoires, on a représenté schématiquement sur les dessins joints :
    • en figure 1 le premier mode vibratoire propre d'une raquette 1, vue selon la direction F de la figure 4, dans une direction perpendiculaire au plan 2 de cette raquette : il s'agit d'une flexion simple orthogonale à ce plan 2 ;
    • en figure 2 le second mode vibratoire propre de cette raquette 1, en flexion simple perpendiculaire à ce plan 2 ;
    • en figure 3 le troisième mode vibratoire propre de cette raquette 1, en flexion simple perpendiculaire a ce plan 2 ;
    • en figure 4 le premier mode vibratoire propre de cette raquette 1, vue en plan, en flexion latérale par rapport à son axe longitudinal y'y dans son plan 2 ;
    • en figure 5 son second mode vibratoire propre, toujours en flexion latérale par rapport à y'y dans le plan 2.
    By way of illustration of some of these vibratory modes, there is shown diagrammatically in the accompanying drawings:
    • in Figure 1 the first proper vibration mode of a racket 1, seen in the direction F of Figure 4, in a direction perpendicular to the plane 2 of this racket: it is a simple bending orthogonal to this plane 2;
    • in Figure 2 the second proper vibration mode of this racket 1, in simple bending perpendicular to this plane 2;
    • in FIG. 3 the third proper vibratory mode of this racket 1, in simple bending perpendicular to this plane 2;
    • in FIG. 4, the first proper vibratory mode of this racket 1, seen in plan, in lateral flexion with respect to its longitudinal axis y'y in its plane 2;
    • in FIG. 5 its second own vibratory mode, still in lateral bending with respect to y'y in the plane 2.
  • Les modes vibratoires propres sur lesquels il est le plus important d'agir sont, bien sûr, les modes de plus forte énergie, c'est-à-dire ceux qui génèrent des déformations importantes de la structure.The natural vibratory modes on which it is most important to act are, of course, the modes of higher energy, that is to say those which generate important deformations of the structure.
  • Il convient donc d'influer en priorité sur les trois premiers modes de flexion perpendiculaires au plan de la raquette, sur les deux premiers modes de flexion dans le plan de la raquette, ainsi que sur le premier mode de couplage des vibrations de flexion perpendiculaire au plan de la raquette et de torsion par rapport à son axe longitudinal.Priority should therefore be given to influencing the first three bending modes perpendicular to the plane of the racket, the first two bending modes in the plane of the racket, as well as the first mode of coupling the bending vibrations perpendicular to the racket plane and torsion with respect to its longitudinal axis.
  • Il est déjà connu, pour régler les qualités de jeu, de prévoir sur une raquette de tennis des moyens relativement complexes pour amortir les vibrations. C'est ainsi qu'il est connu de rapporter des éléments amortisseurs, relativement complexes et en outre encombrants, en des endroits choisis sur le cadre de la raquette.It is already known, to adjust the playing qualities, to provide relatively complex means on a tennis racket to dampen vibrations. Thus it is known to bring damping elements, relatively complex and also bulky, in selected locations on the frame of the racket.
  • En outre, le document FR-A-2 336 299 décrit un dispositif destiné à l'amortissement des déformations dynamiques des oscillations d'une aile ou d'une pale d'hélicoptère, comportant au moins une couche de recouvrement et une couche d'amortissement en élastomère superposées et disposées directement sur l'aile dans la zone de déformation dynamique.In addition, document FR-A-2 336 299 describes a device intended to damping the dynamic deformations of the oscillations of a wing or of a helicopter blade, comprising at least one overlapping layer and an elastomer damping layer superimposed and placed directly on the wing in the deformation zone dynamic.
  • L'invention vise, par des moyens simples et peu onéreux, à régler sélectivement l'amortissement d'une raquette de tennis en appliquant sur celle-ci, en des emplacements déterminés, un élément amortisseur dont le coefficient d'amortissement se trouve être optimal dans la plage de température et de fréquence de fonctionnement de la raquette. Elle se rapporte donc à une raquette de jeu de balle comportant au moins un système amortisseur de vibrations, positionné localement, du type plaque de contrainte associée à un matériau visco-élastique destiné à être sollicité en cisaillement et rapporté solidairement sur l'extérieur de la structure de la raquette, où chaque système amortisseur est constitué d'une plaque bi-matériaux dont l'un des matériaux est une matière visco-élastique dont le coefficient d'amortissement β est d'au moins 0,5 dans une plage de température située entre 10 et 30°C, et pour des fréquences allant de 0 à 1 000 Hz, collée par vulcanisation sur une plaque de contrainte rigide dont le module est très élevé par rapport à celui du matériau visco-élastique, et où chaque système amortisseur est situé dans la zone où le matériau visco-élastique situé entre la raquette et une plaque de contrainte est le plus sollicité en déformation de cisaillement, pour un des modes vibratoires de plus forte énergie, c'est-à-dire au niveau d'un ventre de vibration de l'un des modes vibratoires de plus forte énergie.The invention aims, by simple and inexpensive means, to settle selectively the damping of a tennis racket by applying to it, in determined locations, a damping element whose damping coefficient is found to be optimal in the temperature range and operating frequency of the racket. It therefore relates to a ball game racket comprising at least one vibration damping system, positioned locally, of the stress plate type associated with a visco-elastic material intended to be stressed in shear and attached integrally to the outside of the structure of the racket, where each damping system consists of a bi-material plate of which one of the materials is a visco-elastic material whose damping coefficient β is at least 0.5 in a temperature range located between 10 and 30 ° C, and for frequencies ranging from 0 to 1000 Hz, bonded by vulcanization on a rigid stress plate whose modulus is very high compared to that of the visco-elastic material, and where each damping system is located in the zone where the visco-elastic material located between the racket and a stress plate is the most stressed in shear deformation, for one of the vibra modes tones of higher energy, that is to say at the level of a belly of vibration of one of the vibratory modes of higher energy.
  • Chaque système amortisseur est disposé sur un ventre de vibration de l'un des six modes de plus forte énergie, c'est-à-dire les trois premiers modes de flexion perpendiculaires au plan de la raquette, les deux premiers modes de flexion dans le plan de la raquette, ainsi que le premier mode de couplage de vibrations de flexion perpendiculaire au plan de la raquette et de torsion par rapport à son axe longitudinal.Each damping system is arranged on a vibration belly of one of the six modes of highest energy, that is to say the first three modes of flexion perpendicular to the plane of the racket, the first two modes of flexion in the plane of the racket, as well as the first mode of coupling of flexural vibrations perpendicular to the plane of the racket and of torsion with respect to its longitudinal axis.
  • Avantageusement, l'épaisseur de la plaque en matériau visco-élastique se situe entre 0,5 et 1,2 mm, le coefficient d'amortissement de ce matériau visco-élastique est compris entre 0,8 et 1,2 et l'épaisseur de la plaque de contrainte est comprise entre 0,5 et 1,2 mm.Advantageously, the thickness of the plate of visco-elastic material is between 0.5 and 1.2 mm, the damping coefficient of this visco-elastic material is between 0.8 and 1.2 and the thickness of the stress plate is between 0.5 and 1.2 mm.
  • Par exemple, chaque amortisseur comporte une plaque de contrainte en Zicral, d'une épaisseur de 0,6 mm, qui est collée sur une lame de matériau visco-élastique d'une épaisseur de 0,8 mm, et de coefficient d'amortissement nommé généralement β, de l'ordre de 1,2, optimal dans une plage de température comprise entre 10 et 30°C et pour des fréquences de vibrations comprises entre 10 et 1 000 Hz.For example, each shock absorber has a Zicral stress plate, 0.6 mm thick, which is bonded to a blade of visco-elastic material 0.8 mm thick, and with a damping coefficient generally called β, of the order of 1.2, optimal in a temperature range between 10 and 30 ° C and for vibration frequencies between 10 and 1000 Hz.
  • Cette raquette peut donc comporter au moins un amortisseur visco-élastique, travaillant au cisaillement, qui est placé dans la zone où le matériau visco-élastique situé entre la raquette et la plaque de contrainte en Zicral est le plus sollicité en déformation de cisaillement : il absorbe et dissipe ainsi une grande quantité d'énergie qui n'est pas restituée à la structure. On modifie alors l'effet de la vibration, diminuant l'amplitude de déplacement de la structure.This racket can therefore include at least one shock absorber. visco-elastic, working in shear, which is placed in the area where the visco-elastic material located between the racket and the Zicral stress plate is most stressed in shear deformation: it thus absorbs and dissipates a large amount of energy that is not returned to the structure. The effect of the vibration is then modified, reducing the amplitude of movement of the structure.
  • Pour réaliser cette raquette, on place le ou les amortisseurs, conjugués éventuellement, sur le pont, sur les branches, sur les côtés des branches, ou sur toute autre partie de la raquette se trouvant dans des zones susceptibles de fournir une grande énergie au matériau visco-élastique constituant la partie inférieure de l'élément amortisseur.To make this racket, place the shock absorber (s), optionally combined, on the bridge, on the branches, on the sides of the branches, or on any other part of the racket located in areas capable of supplying great energy to the material. visco-elastic constituting the lower part of the damping element.
  • Suivant sa position sur la raquette, l'amortisseur réduit l'amplitude de certains modes vibratoires, ce qui provoque une modification des sensations du joueur. C'est ainsi que pour amortir l'amplitude du premier mode de vibration en flexion perpendiculaire au plan de la raquette, on positionne le système amortisseur sur la face extérieure et/ou intérieure des branches de la raquette, depuis la partie avant de la poignée jusqu'à l'emplanture du pont. On ressent alors la raquette comme étant plus souple, avec un contact de balle plus long.Depending on its position on the racket, the shock absorber reduces the amplitude of certain vibration modes, which causes a modification of the player's sensations. Thus, to dampen the amplitude of the first mode of vibration in bending perpendicular to the plane of the racket, the damping system is positioned on the outside and / or inside of the arms of the racket, from the front part of the handle. to the root of the bridge. We then feel the racket as being more flexible, with a longer ball contact.
  • En positionnant le système amortisseur sur le pont ou de part et d'autre du pont et/ou sur la tête ou de part et d'autre de la tête du panier, symétriquement par rapport à la fois à l'axe longitudinal de la raquette et/ou au plan de la raquette, on amortit à la fois l'amplitude des deuxième et troisième modes de vibration en flexion perpendiculaires au plan médian de la raquette, ainsi que l'amplitude du premier mode de vibration couplant la flexion perpendiculaire au plan médian de la raquette et la torsion par rapport à l'axe longitudinal médian de la raquette. La raquette paraît à la fois plus nerveuse et ayant un rendement amélioré. Pour des raisons de décoration, ces formes strictement symétriques peuvent être légèrement modifiées.By positioning the shock absorber system on the deck or on either side of the deck and / or on the head or on either side of the basket head, symmetrically with respect to both the longitudinal axis of the racket and / or at the plane of the racket, the amplitude of both the second and third modes of vibration in flexion perpendicular to the median plane of the racket is damped, as well as the amplitude of the first mode of vibration coupling the flexion perpendicular to the plane racket median and torsion with respect to the median longitudinal axis of the racket. The racket appears both more nervous and with improved performance. For reasons of decoration, these strictly symmetrical shapes can be slightly modified.
  • En positionnant le système amortisseur sur les faces du panier, couplées par paires, symétriquement à la fois par rapport au plan longitudinal médian de la raquette et par rapport à la ligne nodale du premier mode de flexion perpendiculaire au plan de la raquette, on amortit préférentiellement l'amplitude de la vibration de ces modes dans la zone du panier. La raquette paraît alors plus stable au moment de l'impact entre la balle et le cordage.By positioning the damping system on the sides of the basket, coupled in pairs, symmetrically both with respect to the median longitudinal plane of the racket and with respect to the nodal line of the first bending mode perpendicular to the plane of the racket, it is preferentially damped the amplitude of the vibration of these modes in the basket area. The racket then appears more stable at the time of impact between the ball and the string.
  • De toute façon, l'invention sera bien comprise, et ses avantages ainsi que d'autres caractéristiques ressortiront, au cours de la description suivante de quelques exemples non limitatifs de réalisation de cette raquette, en référence aux dessins schématiques annexés dans lesquels :
    • Figure 6 est une vue en plan de cette raquette,
    • Figure 7 est une vue en plan agrandie du pont de cette raquette,
    • Figure 8 est une vue en coupe selon VIII-VIII de la figure 7.
    In any case, the invention will be well understood, and its advantages as well as other characteristics will emerge during the following description of a few non-limiting examples of embodiment of this racket, with reference to the appended schematic drawings in which:
    • FIG. 6 is a plan view of this racket,
    • FIG. 7 is an enlarged plan view of the deck of this racket,
    • Figure 8 is a sectional view along VIII-VIII of Figure 7.
  • En se reportant à la figure 6, cette raquette de tennis 1 est composée d'une poignée 12 prolongée par deux branches 6,7 qui portent le panier 3, dont la partie inférieure forme le pont 4. Le panier 3 porte lui-même le tamis 5, composé de cordes longitudinales et transversales et formant la surface de frappe.Referring to Figure 6, this tennis racket 1 is composed of a handle 12 extended by two branches 6,7 which carry the basket 3, the lower part of which forms the bridge 4. The basket 3 itself carries the sieve 5, composed of longitudinal and transverse ropes and forming the striking surface.
  • Comme on le voit mieux sur les figures 7 et 8, il a été fixé par collage, sur les duex faces du pont 4 qui sont parallèles au plan de la raquette 1, une paire d'amortisseurs visco-élastiques identiques 8,9. Chacun des ces deux amortisseurs, par exemple l'amortisseur 8, est formé d'une plaque 10 en matériau visco-élastique sur laquelle est collée une plaque de contrainte 11, en Zicral par exemple. Chaque amortisseur, tel que 8, est collé à plat sur le pont 4 par la face de la plaque 10 qui est opposée à la plaque de contrainte 11.As best seen in Figures 7 and 8, it has been fixed by gluing, on the two sides of the bridge 4 which are parallel to the plane of the racket 1, a pair of identical viscoelastic dampers 8,9. Each of these two shock absorbers, for example the shock absorber 8, is formed of a plate 10 of visco-elastic material on which a stress plate 11 is bonded, in Zicral for example. Each damper, such as 8, is glued flat to the deck 4 by the face of the plate 10 which is opposite to the stress plate 11.
  • Les plaques 10 et 11 sont de même forme et dimensions et leur pourtour épouse celui de la surface du pont 4 sur lequel la plaque 10 est collée, en lui étant toutefois légèrement inférieur. L'épaisseur de la plaque 10 est de 0,8 mm et son coefficient d'amortissement β est de 1,2 dans la plage de températures comprise entre 10 et 30°C, qui est la plage d'utilisation la plus fréquente de la raquette. La plaque de contrainte de Zicral 11 a une épaisseur de 0,6 mm. Chaque amortisseur, 8 ou 9, est totalement symétrique par rapport à l'axe longitudinal y'y de la raquette et peut donc étre considéré comme composé d'un couple d'amortisseurs 81,82 symétriques par rapport à cet axe y,y et travaillant au cisaillement et en opposition. Il y a dans ce cas de figure un couple 8,9 d'amortisseurs placés chacun de part de d'autre du pont.The plates 10 and 11 are of the same shape and dimensions and their periphery matches that of the surface of the bridge 4 on which the plate 10 is glued, while being slightly lower thereto. The thickness of the plate 10 is 0.8 mm and its damping coefficient β is 1.2 in the temperature range between 10 and 30 ° C, which is the most frequent use range of the racket. The stress plate of Zicral 11 has a thickness of 0.6 mm. Each shock absorber, 8 or 9, is completely symmetrical with respect to the longitudinal axis y'y of the racket and can therefore be considered to be composed of a pair of shock absorbers 81, 82 symmetrical with respect to this axis y, y and working in shear and in opposition. In this case there is a pair 8.9 of shock absorbers each placed on either side of the bridge.
  • Avec cette disposition, chaque paire d'amortisseurs 81,82 amortit les modes vibratoires qui prennent naissance dans le plan de la raquette, ce qui augmente le confort du joueur.With this arrangement, each pair of dampers 81.82 dampens the vibration modes which arise in the plane of the racket, which increases the comfort of the player.
  • L'invention n'est bien évidemment pas limitée à cette forme de réalisation. On peut prévoir, en plus des amortisseurs 8,9 ou au lieu de ceux-ci, des amortisseurs analogues 14,15,16,17 collés, préférentiellement de manière symétrique par rapport à l'axe y,y, sur les faces latérales extérieures, et/ou intérieures, des deux branches 6,7. Ces amortisseurs 14 à 17 amortissent les modes vibratoires perpendiculaires au plan de la raquette, ce qui tend à améliorer ses performances. On peut aussi prévoir, seuls ou combinés avec d'autres en d'autres endroits, des amortisseurs 18 rapportés en tête du panier 3, et/ou des amortisseurs 19,20 rapportés sur le panier 3, par exemple au milieu de celui-ci, de part et d'autre de l'axe y'y. Dans chaque cas, au lieu d'avoir des paires d'amortisseurs couplés 8,9, un sur chaque face de la raquette, on peut n'avoir qu'un amortisseur sur une seule face, par exemple l'amortisseur 8 uniquement et pas l'amortisseur 9. La symétrie par rapport à l'axe y'y n'est que préférentielle. Cette raquette peut donc comporter, à titre d'exemples préférentiels :
    • au moins un élément amortisseur 8 et/ou 9 fixé sur le pont 4 de la raquette 1,
    • deux éléments amortisseurs 8 et 9 couplés et fixés de part et d'autre du pont 4,
    • au moins un élément amortisseur 18 et/ou 19 et/ou 20 fixé sur le panier 3,
    • au moins un élément amortisseur 18 fixé en tête du panier 3,
    • deux éléments amortisseurs 18 couplés et fixés en tête du panier 3 de part et d'autre du plan 2 de celui-ci,
    • au moins deux éléments amortisseurs 19,20 couplés et fixés sur le panier 3 de part et d'autre de l'axe longitudinal y'y de la raquette,
    • quatre amortisseurs 19,20 couplés et fixés sur le panier 3 de part et d'autre de son plan 2 ainsi que de son axe longitudinal y'y,
    • au moins un élément amortisseur 14 et/ou 15 et/ou 16 et/ou 17 fixé à l'intérieur ou à l'extérieur d'une branche 6 et/ou 7 de la raquette,
    • deux éléments amortisseurs 16 et 17 couplés et fixés à l'intérieur des deux branches 6,7,
    • deux éléments amortisseurs 14 et 15 couplés et fixés à l'extérieur des deux branches 6,7,
    • quatre éléments amortisseurs 14 à 17 couplés et fixés à l'intérieur et à l'extérieur des deux branches 6,7,

    ou une autre combinaison en positions et dimension de ces éléments amortisseurs.The invention is obviously not limited to this embodiment. It is possible to provide, in addition to the dampers 8, 9 or instead of these, similar dampers 14, 15, 16, 17 bonded, preferably symmetrically with respect to the axis y, y, on the external lateral faces. , and / or interior, of the two branches 6,7. These shock absorbers 14 to 17 dampen the vibration modes perpendicular to the plane of the racket, which tends to improve its performance. One can also provide, alone or combined with others in other places, shock absorbers 18 attached to the top of the basket 3, and / or shock absorbers 19,20 attached to the basket 3, for example in the middle of the latter , on either side of the y'y axis. In each case, instead of having pairs of shock absorbers coupled 8.9, one on each side of the racket, it is possible to have only one shock absorber on one side, for example shock absorber 8 only and not the damper 9. The symmetry with respect to the y'y axis is only preferential. This racket can therefore include, as preferred examples:
    • at least one damping element 8 and / or 9 fixed on the deck 4 of the racket 1,
    • two damping elements 8 and 9 coupled and fixed on either side of the bridge 4,
    • at least one damping element 18 and / or 19 and / or 20 fixed on the basket 3,
    • at least one damping element 18 fixed at the head of the basket 3,
    • two damping elements 18 coupled and fixed at the head of the basket 3 on either side of the plane 2 thereof,
    • at least two damping elements 19,20 coupled and fixed to the basket 3 on either side of the longitudinal axis y'y of the racket,
    • four shock absorbers 19,20 coupled and fixed to the basket 3 on either side of its plane 2 as well as its longitudinal axis y'y,
    • at least one damping element 14 and / or 15 and / or 16 and / or 17 fixed inside or outside of a branch 6 and / or 7 of the racket,
    • two damping elements 16 and 17 coupled and fixed inside the two branches 6,7,
    • two damping elements 14 and 15 coupled and fixed outside the two branches 6,7,
    • four damping elements 14 to 17 coupled and fixed inside and outside the two branches 6,7,

    or another combination in positions and dimensions of these damping elements.
  • Il a été décrit une raquette 1 à pont inversé 4, mais cette raquette peut être de tout autre sorte, par exemple à pont perpendiculaire à l'axe y'y, à pont de courbure inverse de celle de la tête du panier, à pont présentant deux courbures opposées et de sens contraire, etc...A racket 1 with an inverted bridge 4 has been described, but this racket can be of any other kind, for example with a bridge perpendicular to the axis y'y, with a bridge of curvature opposite to that of the head of the basket, with a bridge having two opposite and opposite curvatures, etc.

Claims (21)

  1. A racquet for ball games, more particularly intended for the game of tennis, having at least one system, positioned locally for absorbing vibrations, of the type having a restraint plate associated with a visco-elastic material intended to be acted upon in shear and rigidly joined to the exterior of the racquet structure, in which each absorbing system is constituted by a two-material plate (8, 9, 14, 29) of which one of the materials is a visco-elastic material (10) having a coefficient of absorption β of at least 0.5 in a temperature range located between 10 and 30°C, and for frequencies from 0 to 1,000 Hz, adhered by vulcanisation onto a rigid restraint plate (11) of which the modulus is very high compared with that of the visco-elastic material, and on the other hand in that each absorbing system is located in the zone in which the visco-elastic material located between the racquet and the restraint plate is most urged into shear deformation, for one of the highest energy vibratory modes, i.e. in the region of a vibration peak of one of the highest energy vibratory modes.
  2. A racquet according to Claim 1, characterised in that at least one absorbing system (14-17) is arranged on a vibration peak corresponding to the first vibratory flexion mode perpendicular to the plane of the racquet.
  3. A racquet according to Claim 1, characterised in that at least one absorbing system (8, 9, 18, 19, 20) is located on a vibration peak corresponding to a second vibratory flexion mode perpendicular to the plane of the racquet.
  4. A racquet according to Claim 1, characterised in that at least one absorbing system (8, 9, 18, 19, 20) is located on a vibration peak corresponding to the third vibratory flexion mode perpendicular to the plane of the racquet.
  5. A racquet according to Claim 1, characterised in that at least one absorbing system (8, 9) is located on a vibration peak corresponding to the first vibratory mode of lateral flexion of the racquet.
  6. A racquet according to Claim 1, characterised in that at least one absorbing system (19, 20) is located on a vibration peak corresponding to the second vibratory mode of lateral flexion of the racquet.
  7. A racquet according to Claim 1, characterised in that at least one absorbing system (8, 9, 18, 19, 20) is located on a vibration peak corresponding to the first coupling mode of flexion vibrations perpendicular to the plane of the racquet, and of torsion with respect to its longitudinal axis.
  8. A racquet according to one of Claims 1 to 7, characterised in that the thickness of the plate (10) of visco-elastic material is between 0.5 and 1.2 mm, in that the coefficient of absorption β of the visco-elastic material is between 0.8 and 1.2, and in that the thickness of the restraint plate is between 0.5 and 1.2 mm.
  9. A racquet according to one of Claims 1 to 8, characterised in that the thickness of the plate (10) of visco-elastic material is of the order of 0.8 mm, and in that its coefficient of absorption β is of the order of 1.2.
  10. A racquet according to Claim 9, characterised in that the restraint plate (11) is of Zicral and has a thickness of the order of 0.6 mm.
  11. A racquet according to one of Claims 1 to 10, characterised in that it has at least one absorbing element (8 and/or 9) fixed to the bridge (4) of the racquet (1).
  12. A racquet according to Claim 11, characterised in that it has two coupled absorbing elements (8 and 9) fixed to either side of the bridge (4).
  13. A racquet according to one of Claim 1 to 10, characterised in that it has at least one absorbing element (18 and/or 19 and/or 20) fixed to the racquet head (3).
  14. A racquet according to Claim 13, characterised in that it has at least one absorbing element (18) fixed to the top of the racquet head (3).
  15. A racquet according to Claim 14, characterised in that it has two coupled absorbing elements (18) fixed at the top of the racquet head (3) to either side of the plane (2) thereof.
  16. A racquet according to one of Claims 13 to 15, characterised in that it has at least two coupled absorbing elements (19, 20) fixed on the racquet head (3) to either side of the longitudinal axis (y', y) of the racquet.
  17. A racquet according to Claim 16, characterised in that it has four coupled absorbers (19, 20) fixed on the head (3) to either side of its plane (2), as well as of its longitudinal axis (y', y).
  18. A racquet according to one of Claims 1 to 10, characterised in that it has at least one absorbing element (14 and/or 15 and/or 16 and/or 17) fixed to the interior or to the exterior of one branch (6 and/or 7) of the racquet.
  19. A racquet according to Claim 18, characterised in that it has two coupled absorbing elements (16 and 17) fixed to the interior of the two branches (6, 7).
  20. A racquet according to Claim 18, characterised in that it has two coupled absorbing elements (14 and 15) fixed to the exterior of the two branches (6, 7).
  21. A racquet according to Claim 18, characterised in that it has four coupled absorbing elements (14 to 17) fixed to the interior and to the exterior of the two branches (6, 7).
EP87420349A 1986-12-22 1987-12-21 Tennis racket Expired - Lifetime EP0275805B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8618458A FR2608444B1 (en) 1986-12-22 1986-12-22 Tennis racket
FR8618458 1986-12-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT87420349T AT66627T (en) 1986-12-22 1987-12-21 Tennis racket.

Publications (2)

Publication Number Publication Date
EP0275805A1 EP0275805A1 (en) 1988-07-27
EP0275805B1 true EP0275805B1 (en) 1991-08-28

Family

ID=9342507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87420349A Expired - Lifetime EP0275805B1 (en) 1986-12-22 1987-12-21 Tennis racket

Country Status (7)

Country Link
US (1) US4875679A (en)
EP (1) EP0275805B1 (en)
JP (1) JPS63164968A (en)
AT (1) AT66627T (en)
DE (2) DE275805T1 (en)
ES (1) ES2003855A4 (en)
FR (1) FR2608444B1 (en)

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AT406734B (en) * 1993-08-05 2000-08-25 Degaris Kenneth Godfrey RACKET FRAME

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US4964635A (en) * 1989-04-14 1990-10-23 Fitzgerald Gary C Tennis racket
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US5314180A (en) * 1989-08-28 1994-05-24 Toray Industries, Inc. Sports instrument and impact-absorbing element to be attached to sports equipment
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Also Published As

Publication number Publication date
ES2003855A4 (en) 1988-12-01
AT66627T (en) 1991-09-15
JPS63164968A (en) 1988-07-08
EP0275805A1 (en) 1988-07-27
DE3772549D1 (en) 1991-10-02
FR2608444B1 (en) 1989-03-31
DE275805T1 (en) 1989-01-05
FR2608444A1 (en) 1988-06-24
US4875679A (en) 1989-10-24

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