EP0208639B1 - Device for suppressing vibrations in a tennis racket - Google Patents

Device for suppressing vibrations in a tennis racket Download PDF

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Publication number
EP0208639B1
EP0208639B1 EP86440038A EP86440038A EP0208639B1 EP 0208639 B1 EP0208639 B1 EP 0208639B1 EP 86440038 A EP86440038 A EP 86440038A EP 86440038 A EP86440038 A EP 86440038A EP 0208639 B1 EP0208639 B1 EP 0208639B1
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EP
European Patent Office
Prior art keywords
strings
tennis racket
string system
torus
elastomeric material
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EP86440038A
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German (de)
French (fr)
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EP0208639A1 (en
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Louis Boschian
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Individual
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Individual
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Priority claimed from FR8507830A external-priority patent/FR2582224B1/en
Priority claimed from FR8511356A external-priority patent/FR2585257B1/en
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Priority to AT86440038T priority Critical patent/ATE59310T1/en
Publication of EP0208639A1 publication Critical patent/EP0208639A1/en
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/54—Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations

Definitions

  • the present invention relates to devices intended to attenuate the vibrations of a tennis racket when the ball is struck. It is well known that each stroke struck with the racket causes high frequency vibrations of the racket, and that these vibrations are attributed to the harmful effects on the player, in the hand and arm, including affection known as "tennis elbow".
  • the document FR-A 1 398 833 presents a vibration damper for tennis rackets or other similar games, constituted by a plate of elastomeric material which is engaged in a quadrilateral formed by four contiguous strings, this damper being mounted with a some play between the hub and the rope.
  • the document FR-A 2 385 417 proposes to couple at least two longitudinal parallel cords with an element of elastomeric material molded or glued over these two cords outside the transverse cords so as to bring them together. the other.
  • the "active" element is a counterweight centered with respect to the device, and connected to it by flexible elements which transmit the vibrations to it in its entirety.
  • this counterweight is located in the center of the device and connected to it by a flexible membrane secured to at least part of its periphery.
  • the counterweight can for example consist of a steel ball trapped between two thin films of the elastomeric material, playing the role of said membrane. It can also come from molding with said membrane and the entire device.
  • the counterweight is formed by two plates each located in a plane above the cords and joined by small columns of elastomeric material playing the role of the device for spacing the four adjacent cords mentioned above.
  • the racket R consists, in the usual way, of a frame 1, a handle 2, longitudinal strings 3 and transverse strings 4
  • the device according to the invention consists of a disc 5 inserted in the square delimited by the strings 3a, 3b, 4a and 4b. As can be seen in FIG. 2, it has on its periphery a groove in which are housed said strings of said square, which ensures that device 5 is kept in place.
  • the diameter D of the groove is approximately 2 to 3 mm greater than the distance d between the two corresponding cords 4a-4b; if the disc is exactly circular, this diameter D is also greater by the distance between the strings 3a-3b. If the device 5 is slightly oblong, as shown in FIG. 1, to take account of the geometry of the rope, its diameter D ′ in the longitudinal direction will be correspondingly greater than d ′.
  • the device 5 once in place, therefore deviates about 2 to 3 mm from each other each pair of parallel strings 3a-3b and 4a-4b. This results in an equidirectional action on the string represented by the arrows F. Experience shows that this action already has the consequence of damping and considerably attenuating the vibrations which normally arise in the racket at each impact on the ball.
  • an advantage of this device is that it is removable, instead of being glued or molded on site like devices of the same kind already. propo sés, and in particular those described in the aforementioned French document. It can therefore be placed in the area of the rope where it exerts its optimal effect.
  • the device can be circular or slightly oblong. It can also consist of a solid disc or a ring as shown. We can also give it any other shape (square, etc ). It can be made of any elastomeric material, the flexibility of which allows it to be put in place without damaging the strings, while retaining sufficient rigidity to ensure the spacing of the strings under the effect of the forces F.
  • the device also consists of a torus 10, also made of elastomeric material, and in a groove 11 of which are housed the four cords C forming one of the mesh of the racket sieve, as described with reference to FIGS. 1 and 2, but comprising, moreover, according to the invention, a steel ball 12 trapped between two thin membranes 13_a-13_b made of elastomeric material also and integral with the torus 10 in its median plane.
  • the embodiment shown in section in FIG. 4 differs from the previous one in that, instead of a steel ball, trapped between two membranes, there is provided, for the same effect, a counterweight 14 molded in a single piece with a single membrane 15, itself integral with the torus 10.
  • the connection zones 16 of this torus 10 with the membrane 15 are advantageously chamfered.
  • the counterweight 12 or 14 when the racket hits the ball will receive the vibrations of the racket, transmitted by the membrane (s), and experience shows that thanks to the presence of this vibrating, foreign element with the racket, the composition of the various phenomena leads to an almost total cancellation of the harmful vibrations of the racket.
  • FIG. 5 represents another embodiment of such a counterweight this time consisting of two square plates 18 and 18 ′ joined by four colonettes 17 made of elastomeric material, coming to be placed inside the square formed by the four cords C, by exerting on them a push towards the outside.
  • the vibrations of the strings C are thus transmitted to the plates 18-18 ', which thus play, outside the strings C, the same role as the preceding flyweights 12 and 14, located inside.
  • the plates 18-18 ' can also be circular or of any other symmetrical shape.
  • FIG. 6 illustrates the fact that the membrane (s) or plates may be integral with the torus only on certain fractions of their periphery to take account of the pressure differences between the strings.
  • the pressure on the vertical strings being stronger than on the horizontal strings, it is possible to cut the membrane or the pads so that the attachment of the flyweight is preferably done on the vertical strings.
  • the metal ball 12 may consist of a drop of mercury trapped between the films 13a, 13b.
  • the advantage which one draws from it is to profit from a significant weight located punctually.
  • Incidentally it can be used to decorate or personalize the racket, by its color or shape, or by serving as a support for an initial.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Vibration Prevention Devices (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)

Description

La présente invention concerne les dispositifs destinés à atténuer les vibrations d'une raquette de tennis au moment de la frappe de la balle. Il est bien connu que chaque coup frappé avec la raquette détermine des vibrations à haute fréquence de la raquette, et que l'on attribue à ces vibrations les effets nuisibles sur le joueur, au niveau de la main et du bras, notamment l'affection connue sous le nom de "tennis elbow".The present invention relates to devices intended to attenuate the vibrations of a tennis racket when the ball is struck. It is well known that each stroke struck with the racket causes high frequency vibrations of the racket, and that these vibrations are attributed to the harmful effects on the player, in the hand and arm, including affection known as "tennis elbow".

De nombreuses tentatives ont déjà été faites en vue d'amortir ces vibrations, soit par l'emploi de nouveaux matériaux pour la construction du cadre ou le cordage, soit par l'incorporation de dispositifs amortisseurs entre les cordes et le cadre, ou entre la tête et le manche. Ainsi le document FR-A 1 398 833 présente un amortisseur de vibrations pour raquettes de tennis ou autres jeux analogues, constitué par une plaque en matériau élastomère que l'on engage dans un quadrilatère formé par quatre cordes contigües, cet amortisseur étant monté avec un certain jeu entre le moyeu et le cordage.Many attempts have already been made to dampen these vibrations, either by the use of new materials for the construction of the frame or the rope, or by the incorporation of damping devices between the cords and the frame, or between the head and handle. Thus the document FR-A 1 398 833 presents a vibration damper for tennis rackets or other similar games, constituted by a plate of elastomeric material which is engaged in a quadrilateral formed by four contiguous strings, this damper being mounted with a some play between the hub and the rope.

De même, le document FR-A 2 385 417 propose d'accoupler au moins deux cordes parallèles longitudinales avec un élément en matériau élastomère moulé ou collé par dessus ces deux cordes à l'extérieur des cordes transversales de manière à les rapprocher l'une de l'autre.Likewise, the document FR-A 2 385 417 proposes to couple at least two longitudinal parallel cords with an element of elastomeric material molded or glued over these two cords outside the transverse cords so as to bring them together. the other.

Ces solutions ne sont pas entièrement satisfaisantes, et le déposant a constaté que l'on peut rendre ce genre du dispositif beaucoup plus efficace en réunissant un élément "passif", constitué par une plaque semblable à celle de FR-A 1 398 833, mais exerçant un effet de pression et d'écartement simultanément sur quatre cordes contigües, à savoir deux cordes transversales et deux cordes longitudinales définissant le carré dans lequel est logé le dispositif, avec un élément "actif", c'est-à-dire susceptible de prendre lui-même un mouvement vibratoire, qui, venant se composer avec celui de la raquette, parvient à l'annuler. Ce dispositif constitue l'objet de la revendication 1.These solutions are not entirely satisfactory, and the applicant has observed that this type of device can be made much more effective by assembling a "passive" element, constituted by a plate similar to that of FR-A 1 398 833, but exerting a pressure and spreading effect simultaneously on four contiguous cords, namely two transverse cords and two longitudinal cords defining the square in which the device is housed, with an "active" element, that is to say capable of take a vibratory movement itself, which, coming to compose with that of the racket, manages to cancel it. This device is the subject of claim 1.

La mise sous tension simultanée des quatre côtés du carré par l'élément passif se traduit par une action d'amortissement équidirectionnelle, c'est-à-dire sans direction préférentielle, ce qui semble être l'explication de l'efficacité de ce dispositif sur l'atténuation des vibrations de la raquette.The simultaneous energization of the four sides of the square by the passive element results in an equidirectional damping action, that is to say without preferential direction, which seems to be the explanation of the effectiveness of this device on damping racket vibrations.

Par ailleurs, l'élément "actif" est une masselotte centrée par rapport au dispositif, et reliée à lui par des éléments souples lui transmettant intégralement les vibrations.Furthermore, the "active" element is a counterweight centered with respect to the device, and connected to it by flexible elements which transmit the vibrations to it in its entirety.

Selon un premier mode de réalisation de l'invention, cette masselotte est située au centre du dispositif et reliée à lui par une membrane souple solidaire d'au moins une partie de sa périphérie.According to a first embodiment of the invention, this counterweight is located in the center of the device and connected to it by a flexible membrane secured to at least part of its periphery.

Dans ce cas, la masselotte peut par exemple être constituée par une bille d'acier emprisonnée entre deux pellicules minces du matériau élastomère, jouant le rôle de ladite membrane. Elle peut également venir de moulage avec ladite membrane et l'ensemble du dispositif.In this case, the counterweight can for example consist of a steel ball trapped between two thin films of the elastomeric material, playing the role of said membrane. It can also come from molding with said membrane and the entire device.

Selon un second mode de réalisation, la masselotte est formée de deux plaquettes situées chacune dans un plan au-dessus des cordes et réunies par des colonettes de matériau élastomère jouant le rôle du dispositif d'écartement des quatre cordes adjacentes précité.According to a second embodiment, the counterweight is formed by two plates each located in a plane above the cords and joined by small columns of elastomeric material playing the role of the device for spacing the four adjacent cords mentioned above.

On notera que, dans US-A 4 057 250 est décrit un dispositif visant le même résultat et comportant en son centre un logement creux partiellement rempli de petits grains de plomb. Toutefois ce dispositif n'est pas placé entre les cordes de la raquette, mais en haut du manche, à l'extétrieur de la surface du tamis.It will be noted that, in US Pat. No. 4,057,250, a device is described having the same result and comprising in its center a hollow housing partially filled with small grains of lead. However, this device is not placed between the strings of the racket, but at the top of the handle, outside the surface of the sieve.

On va décrire maintenant l'invention plus en détail en se référant à ses diverses variantes et à un certain nombre de modes de réalisation de celles-ci.The invention will now be described in more detail with reference to its various variants and to a number of embodiments thereof.

Sur ce dessin:

  • - la figure 1 est une illustration schématique du dispositif dont l'invention représente un perfectionnement, mis en place sur une raquette;
  • - la figure 2 est une coupe suivant II-II de la figure 1;
  • - la figure 3 illustre en perspective avec arrachement partiel un premier mode de réalisation du dispositif selon l'invention;
  • - la figure 4 est une coupe illustrant un mode de réalisation analogue à celui de la figure 3;
  • - la figure 5 illustre en perspective avec arrachement partiel un second mode de réalisation de ladite invention;
  • - la figure 6 est une vue en plan d'une autre forme de mode de réalisation de la figure 5.
On this drawing:
  • - Figure 1 is a schematic illustration of the device whose invention represents an improvement, implemented on a racket;
  • - Figure 2 is a section along II-II of Figure 1;
  • - Figure 3 illustrates in perspective with partial cutaway a first embodiment of the device according to the invention;
  • - Figure 4 is a section illustrating an embodiment similar to that of Figure 3;
  • - Figure 5 illustrates in perspective with partial cutaway a second embodiment of said invention;
  • FIG. 6 is a plan view of another embodiment of FIG. 5.

Si l'on se reporte tout d'abord aux figures 1 et 2, on voit que la raquette R se compose, de manière usuelle, d'un cadre 1, d'un manche 2, de cordes longitudinales 3 et de cordes transversales 4. Le dispositif selon l'invention est constitué par un disque 5 inséré dans le carré délimité par les cordes 3a, 3b, 4a et 4b. Comme on le voit sur la figure 2, il présente sur sa périphérie une gorge dans laquelle viennent se loger lesdites cordes dudit carré, ce qui assure le maintien en place du dispositif 5.If we refer first to Figures 1 and 2, we see that the racket R consists, in the usual way, of a frame 1, a handle 2, longitudinal strings 3 and transverse strings 4 The device according to the invention consists of a disc 5 inserted in the square delimited by the strings 3a, 3b, 4a and 4b. As can be seen in FIG. 2, it has on its periphery a groove in which are housed said strings of said square, which ensures that device 5 is kept in place.

Le diamètre D de la gorge est supérieur d'environ 2 à 3 mm à la distance d entre les deux cordes correspondantes 4a-4b; si le disque est exactement circulaire, ce diamètre D est également supérieur d'autant à la distance d'entre les cordes 3a-3b. Si le dispositif 5 est légèrement oblong, comme représenté à la figure 1, pour tenir compte de la géométrie du cordage, son diamètre D' dans le sens longitudinal sera supérieur d'autant à d'.The diameter D of the groove is approximately 2 to 3 mm greater than the distance d between the two corresponding cords 4a-4b; if the disc is exactly circular, this diameter D is also greater by the distance between the strings 3a-3b. If the device 5 is slightly oblong, as shown in FIG. 1, to take account of the geometry of the rope, its diameter D ′ in the longitudinal direction will be correspondingly greater than d ′.

Le dispositif 5, une fois en place, écarte donc d'environ 2 à 3 mm l'un de l'autre chaque couple de cordes parallèles 3a-3b et 4a-4b. Il en résulte sur le cordage une action équidirectionnelle représentée par les flèches F. L'expérience montre que cette action a déjà pour conséquence un amortissement et une atténuation importante des vibrations qui prennent normalement naissance dans la raquette à chaque impact sur la balle.The device 5, once in place, therefore deviates about 2 to 3 mm from each other each pair of parallel strings 3a-3b and 4a-4b. This results in an equidirectional action on the string represented by the arrows F. Experience shows that this action already has the consequence of damping and considerably attenuating the vibrations which normally arise in the racket at each impact on the ball.

Outre cet effet, dont l'efficacité est expérimentalement supérieure à celle de tous les moyens essayés jusqu'ici, un avantage de ce dispositif est d'être amovible, au lieu d'être collé ou moulé sur place comme les dispositifs du même genre déjà proposés, et notamment ceux décrits dans le document français précité. Il peut donc être placé dans la zone du cordage où il exerce son effet optimal.In addition to this effect, the effectiveness of which is experimentally higher than that of all the means tested so far, an advantage of this device is that it is removable, instead of being glued or molded on site like devices of the same kind already. propo sés, and in particular those described in the aforementioned French document. It can therefore be placed in the area of the rope where it exerts its optimal effect.

Comme déjà indiqué, le dispositif peut être circulaire ou légèrement oblong. Il peut également consister en un disque plein ou un anneau comme représenté. On peut également lui donner toute autre forme (carrée, etc...). Il peut être réalisé en tout matériau élastomère dont la souplesse permet la mise en place sans endommager les cordes, tout en conservant suffisamment de rigidité pour assurer l'écartement des cordes sous l'effet des forces F.As already indicated, the device can be circular or slightly oblong. It can also consist of a solid disc or a ring as shown. We can also give it any other shape (square, etc ...). It can be made of any elastomeric material, the flexibility of which allows it to be put in place without damaging the strings, while retaining sufficient rigidity to ensure the spacing of the strings under the effect of the forces F.

Si l'on se reporte maintenant à la figure 3, on voit que, selon l'invention, le dispositif se compose encore d'un tore 10, également en matériau élastomère, et dans une gorge 11 duquel viennent se loger les quatre cordes C formant une des mailles du tamis de la raquette, comme il est décrit à propos des figures 1 et 2, mais comportant, au surplus, selon l'invention, une bille d'acier 12 emprisonnée entre deux membranes minces 13_a-13_b en matériau élastomère également et solidaires du tore 10 dans son plan médian.Referring now to Figure 3, we see that, according to the invention, the device also consists of a torus 10, also made of elastomeric material, and in a groove 11 of which are housed the four cords C forming one of the mesh of the racket sieve, as described with reference to FIGS. 1 and 2, but comprising, moreover, according to the invention, a steel ball 12 trapped between two thin membranes 13_a-13_b made of elastomeric material also and integral with the torus 10 in its median plane.

La réalisation représentée en coupe sur la figure 4 se distingue de la précédente en ce que, au lieu d'une bille d'acier, emprisonnée entre deux membranes, il est prévu, au même effet, une masselotte 14 venue de moulage en une seule pièce avec une membrane unique 15, elle-même solidaire du tore 10. Les zones de raccordement 16 de ce tore 10 avec la membrane 15 sont avantageusement chanfreinées.The embodiment shown in section in FIG. 4 differs from the previous one in that, instead of a steel ball, trapped between two membranes, there is provided, for the same effect, a counterweight 14 molded in a single piece with a single membrane 15, itself integral with the torus 10. The connection zones 16 of this torus 10 with the membrane 15 are advantageously chamfered.

Dans ces deux réalisations, la masselotte 12 ou 14 au moment où la raquette frappe la balle, va recevoir les vibrations de la raquette, transmises par la ou les membranes, et l'expérience montre que grâce à la présence de cet élément vibrant, étranger à la raquette, la composition des différents phénomènes conduit à une annulation pratiquement totale des vibrations nocives de la raquette.In these two embodiments, the counterweight 12 or 14 when the racket hits the ball, will receive the vibrations of the racket, transmitted by the membrane (s), and experience shows that thanks to the presence of this vibrating, foreign element with the racket, the composition of the various phenomena leads to an almost total cancellation of the harmful vibrations of the racket.

La figure 5 représente une autre réalisation d'une telle masselotte constituée cette fois de deux plaquettes carrées 18 et 18' réunies par quatre colonettes 17 en matériau élastomère, venant se placer à l'intérieur du carré formé par les quatre cordes C, en exerçant sur elles une poussée vers l'extérieur. Les vibrations des cordes C sont ainsi transmises aux plaques 18-18', qui jouent ainsi, à l'extérieur des cordes C, le même rôle que les masselottes précédentes 12 et 14, situées à l'intérieur. Bien entendu les plaques 18-18' peuvent également être circulaires ou de toute autre forme symétrique.FIG. 5 represents another embodiment of such a counterweight this time consisting of two square plates 18 and 18 ′ joined by four colonettes 17 made of elastomeric material, coming to be placed inside the square formed by the four cords C, by exerting on them a push towards the outside. The vibrations of the strings C are thus transmitted to the plates 18-18 ', which thus play, outside the strings C, the same role as the preceding flyweights 12 and 14, located inside. Of course the plates 18-18 'can also be circular or of any other symmetrical shape.

Dans tous les cas, l'introduction du dispositif dans le cordage se fait par déformation élastique, ce qui implique un matériau élastomère relativement souple.In all cases, the introduction of the device into the rope is done by elastic deformation, which implies a relatively flexible elastomeric material.

Enfin la figure 6 illustre le fait que la (ou les) membrane(s) ou plaquettes peuvent n'être solidaires du tore que sur certaines fractions de leur périphérie pour tenir compte des différences de pression entre les cordes. Ainsi, la pression sur les cordes verticales étant plus forte que sur les cordes horizontales, on peut opérer un découpage sur la membrane ou les plaquettes pour que l'accrochage de la masselotte se fasse préférentiellement sur les cordes verticales.Finally, FIG. 6 illustrates the fact that the membrane (s) or plates may be integral with the torus only on certain fractions of their periphery to take account of the pressure differences between the strings. Thus, the pressure on the vertical strings being stronger than on the horizontal strings, it is possible to cut the membrane or the pads so that the attachment of the flyweight is preferably done on the vertical strings.

C'est ce qui apparaît sur la figure 6 où les plaquettes 19 analogues aux plaquettes 17 de la figure 5 sont chanfreinées en 20 dans le même sens longitudinal que la gorge 21; cela impose d'ailleurs un repère 22 pour placer correctement le dispositif entre les cordes.This is what appears in FIG. 6 where the plates 19 similar to the plates 17 of FIG. 5 are chamfered at 20 in the same longitudinal direction as the groove 21; this also imposes a mark 22 to correctly place the device between the strings.

Enfin, il est également possible d'atteindre un résultat semblable par un masselottage réalisé au moyen d'un ensemble de balourds répartis symétriquement sur le tore ou les plaquettes, soit vers l'intérieur, soit vers l'extérieur. Ces balourds peuvent consister en des pattes très souples venues de moulage avec le tore, avec une section d'accrochage très mince par rapport au diamètre du dispositif.Finally, it is also possible to achieve a similar result by a weighting carried out by means of a set of unbalances distributed symmetrically on the torus or the plates, either inwards or outwards. These unbalances can consist of very flexible tabs coming from molding with the torus, with a very thin hooking section compared to the diameter of the device.

On notera que, dans la réalisation de la figure 3, la bille métallique 12 peut consister en une goutte de mercure emprisonnée entre les pellicules 13a, 13b. L'avantage qu'on en tire est de bénéficier d'un poids important localisé ponctuellement.Note that, in the embodiment of Figure 3, the metal ball 12 may consist of a drop of mercury trapped between the films 13a, 13b. The advantage which one draws from it is to profit from a significant weight located punctually.

L'expérience a montré que ce nouveau dispositif se révèle le plus efficace de tous ceux qui ont été proposés et expérimentés à ce jour.Experience has shown that this new device proves to be the most effective of all those which have been proposed and tested to date.

Accessoirement il peut être utilisé pour décorer ou personnaliser la raquette, par sa couleur ou sa forme, ou en servant de support à une initiale.Incidentally it can be used to decorate or personalize the racket, by its color or shape, or by serving as a support for an initial.

Claims (8)

1. Tennis racket string system, provided with a device for attenuating the vibrations caused by the use of said racket, said device being constituted by at least one elastomeric material plate having a peripheral groove and which is to be placed in a quadrilateral defined by four continguous strings of said racket, characterized in that the dimensions of said plate are such that, once in place, without clearance in the said groove, the two parallel strings of each pair of strings forming said quadrilateral are spaced from one another by a distance of approximately 2 to 3 mm and in that at least one weight is associated with said plate by a membrane integrally transmitting to it the vibrations of the strings.
2. Tennis racket string system provided with a device according to claim 1, characterized in that the device comprises an elastomeric material torus, in a peripheral groove of which are located four strings of the string system, said weight being associated with the torus by a membrane keeping it in the centre of the torus.
3. Tennis racket string system equipped with the device according to claims 1 and 2, characterized in that the weight is a metal ball trapped in the centre of the torus by two elastomeric material films together serving as the membrane.
4. Tennis racket string system provided with the device according to claims 1 and 2, characterized in that the weight is an elastomeric material block integral with the membrane and the torus.
5. Tennis racket string system provided with the device according to claim 3, characterized in that the metal ball is a drop of mercury.
6. Tennis racket string system provided with the device according to claim 1, characterized in that the weight is formed from two plates positioned above the strings and joined by small columns of elastomeric material at the same time exerting a pressure towards the outside on the four adjacent strings.
7. Tennis racket string system provided with the device according to one of the claims 3 to 6, characterized in that the membrane is cut in such a way as to transmit in preferred manner the vibrations of certain strings.
8. Tennis racket string system provided with the device according to claim 1, characterized in that the weight is constituted by a plurality of unbalances symmetrically distributed over the said system.
EP86440038A 1985-05-22 1986-05-22 Device for suppressing vibrations in a tennis racket Expired - Lifetime EP0208639B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86440038T ATE59310T1 (en) 1985-05-22 1986-05-22 TENNIS RACKET VIBRATION DAMPING DEVICE.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8507830 1985-05-22
FR8507830A FR2582224B1 (en) 1985-05-22 1985-05-22 DEVICE FOR MITIGATION OF VIBRATION ON A TENNIS RACKET
FR8511356 1985-07-23
FR8511356A FR2585257B1 (en) 1985-07-23 1985-07-23 DEVICE FOR SUPPRESSING VIBRATION FROM A TENNIS RACKET

Publications (2)

Publication Number Publication Date
EP0208639A1 EP0208639A1 (en) 1987-01-14
EP0208639B1 true EP0208639B1 (en) 1990-12-27

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EP86440038A Expired - Lifetime EP0208639B1 (en) 1985-05-22 1986-05-22 Device for suppressing vibrations in a tennis racket

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US (1) US4761007A (en)
EP (1) EP0208639B1 (en)
AU (1) AU588876B2 (en)
DE (1) DE3676575D1 (en)
ES (1) ES8706461A1 (en)
PT (1) PT82630B (en)

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Publication number Priority date Publication date Assignee Title
USRE34420E (en) * 1986-06-19 1993-10-26 Darling James P Sports racquet
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US20130310203A1 (en) * 2012-05-15 2013-11-21 HK Innovations, LLC Device and method for improved tennis racket damping and weight adjustment
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Also Published As

Publication number Publication date
AU5770086A (en) 1987-01-15
AU588876B2 (en) 1989-09-28
ES8706461A1 (en) 1987-03-16
DE3676575D1 (en) 1991-02-07
US4761007A (en) 1988-08-02
EP0208639A1 (en) 1987-01-14
ES555688A0 (en) 1987-03-16
PT82630B (en) 1992-07-31
PT82630A (en) 1986-06-01

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