EP0260208B1 - Tennis racket - Google Patents

Tennis racket Download PDF

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Publication number
EP0260208B1
EP0260208B1 EP87420238A EP87420238A EP0260208B1 EP 0260208 B1 EP0260208 B1 EP 0260208B1 EP 87420238 A EP87420238 A EP 87420238A EP 87420238 A EP87420238 A EP 87420238A EP 0260208 B1 EP0260208 B1 EP 0260208B1
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EP
European Patent Office
Prior art keywords
frame
strings
racket
crown
axis
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP87420238A
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German (de)
French (fr)
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EP0260208A1 (en
Inventor
Gilles Du Gardin
Dominique Deville
Maurice Woehrle
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Skis Rossignol SA
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Skis Rossignol SA
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Priority to AT87420238T priority Critical patent/ATE55698T1/en
Publication of EP0260208A1 publication Critical patent/EP0260208A1/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
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B49/022—String guides on frames, e.g. grommets
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B49/03—Frames characterised by throat sections, i.e. sections or elements between the head and the shaft
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B2049/0217—Frames with variable thickness of the head in the string plane

Definitions

  • the present invention relates to a tennis racket comprising longitudinal strings and transverse strings perpendicular to the longitudinal axis of the racket, the strings being carried by a basket of rounded external shape, without any rectilinear part, the two branches forming the birth of the basket being connected by a bridge which, if it is reversed, that is to say that it has a curvature identical to that of the head of the basket, gives, in the middle part of the racket, a same length to longitudinal ropes.
  • a tennis racket generally consists of a handle held by the player, extended by branches carrying a basket, of round or oval shape for example, itself carrying the sieve composed of the longitudinal strings and the transverse strings, forming the surface typing.
  • Each rope crosses the basket right through, passing at each end inside a hole provided in the frame. In this borehole is often fitted a coaxial tubular piece for protecting the rope, known as a "barrel" or "eyelet", through which the rope passes.
  • the outside edge of the basket is generally hollowed out by an elongated groove, coplanar with a sieve, in which the strings circulate, so that their parts outside the frame are protected.
  • the branches are connected by a bridge which constitutes the base of the basket.
  • This bridge which supports one end of the median longitudinal cords, allows, in the case where it is inverted, the median longitudinal cords to be of equal length.
  • length of a cord is meant here both the total length of the latter, comprised between the external inlets of its two end eyelets, and also the part of this cord which is visible on the sieve.
  • the aim is to make the deformation of each median longitudinal cord, under a bullet impact, identical from one cord to another. It is however not the same, on this kind of known racket, for the transverse strings, so that the operation of the racket is not optimal.
  • Document FR-A 2 450 114 relates to a tennis racket, the internal shape of the basket having flats respectively parallel and perpendicular to the median longitudinal axis of the racket, which gives the longitudinal and transverse central strings an equal length, respectively. indoor to indoor basket.
  • all these cords do not work in the same way, since the part of each cord which lengthens under the effect of the stress of the impact of the ball is appreciated between the points of support of the cord, that is to say from the bottom of the throat to the bottom of the throat.
  • the object of the invention is to provide a tennis racket for which, in a defined median zone of the sieve, preferably centered on the percussion center, the deformation of each string, transverse and longitudinal, is identical to a string of the same type to another. It should be remembered that the center of percussion corresponds to the point where the impact of the ball does not cause annoying shocks in the hand or the arm of the player.
  • This object must be achieved without increasing the weight of the racket by increasing the thickness of the frame or the addition of additional elements, and without weakening the racket by reducing the thickness of the frame.
  • this tennis racket comprising longitudinal strings and transverse strings perpendicular to the longitudinal axis of the racket, the strings being carried by a basket having a rounded outer line without any straight part, with an inverted bridge conferring, in the middle part of the racket, thanks to its curvature identical to that of the head of the basket, the same length with the longitudinal strings, two opposite sections of the basket located at the port and at the other of the longitudinal axis, each having, at least in the middle part of the basket, a groove, coplanar with the sieve, in which the transverse cords circulate after having crossed the frame, the internal faces of the two opposite sections of the basket being rectilinear and parallel to the longitudinal axis, in a axial zone (S) of the middle part of the basket, is characterized in that, in this determined axial zone (S) of the middle part of these two tr opposite onces, the throat bottoms are rectilinear and parallel to the longitudinal axis, so that the transverse strings are,
  • these sections are determined so that the striking zone defined by the set of strings, respectively longitudinal and transverse, of equal length, is substantially centered on the center of percussion. This improves the tolerance to the decentering of the ball during impact.
  • this tennis racket 1 is composed of a handle 2 extended by branches 17 carrying a basket 3, the lower part of which forms an inverted point 4.
  • the basket 3 itself carries the sieve 5 , composed of longitudinal strings 6 and transverse strings 7, forming the striking surface.
  • the inverted bridge is a known technique, giving the longitudinal strings the same length in the middle of the racket.
  • the basket 3 has a rounded external shape, without any straight part, which gives it an adequate radial stiffness to obtain a good performance of the racket.
  • the two middle sections 10, 11 of the basket which are located on either side of the longitudinal axis 12 of the racket, have, in a sector S of length L and defined position, their inner faces 13, 14 having a rib such that their median parts are rectilinear and parallel to each other and to the axis 12. Furthermore, as can also be seen in FIGS. 3 and 4, the depth of the groove 9 is variable in this area of length L, gradually increasing to its center, then decreasing symmetrically thereafter, so that the bottom 15 of this groove is, in this zone, also rectilinear and parallel to the axis 12.
  • these transverse strings 70 As with the median longitudinal strings 60, these transverse strings 70, subjected to the same initial tension, having the same frequency of vibration and the same speed of movement, will thus return in synchronism after a bullet impact. Their elastic energies add up completely when the ball is returned, which improves the performance of the racket.
  • the zone S of length L has its center offset towards the bridge, with respect to the geometric center O of the basket 3, so that it coincides with the center of percussion of the racket.
  • these transverse strings 70 also of the same length, define a central striking zone 16 in which all the strings are in synchronism with the return after the impact of the ball.
  • the zone 16 being centered on the percussion center I, the tolerance to the decentering of the ball during the impact is advantageously improved, that is to say that the latter may deviate more from the point than in the usual rackets without causing annoying shocks in the hand or the arm of the player, and without significantly affecting the performance of the racket.
  • centripetal offset of the groove bottoms and / or the internal faces 14 of the basket could, for example, only exist in the areas immediately surrounding the end or ends of each protective rope barrel.
  • tennis racket not only a racket for the actual tennis game, but also a racket for ball games of the same kind, such as squash and the badmington for example.

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Abstract

A tennis racket has an elongated handle defining a longitudinal main axis and having an outer end and an annular frame fixed to the outer handle end and bisected by the axis. The frame has an arcuate crown concave toward the handle and an arcuate throat concave toward the handle and of substantially the same transverse size and curvature as the crown. The crown and throat are formed with respective longitudinally aligned sets of longitudinally throughgoing and transversely spaced holes. In addition the frame has a pair of sides substantially symmetrically flanking the axis and longitudinally bridging the crown and throat. These sides are formed with respective transversely aligned sets of transversely throughgoing and longitudinally spaced holes. The crown and sides together define an oval outer periphery. The side holes open outward at their outer ends into respective outwardly open grooves in the sides of the frame. Main strings extending longitudinally between respective holes of the crown and throat substantially parallel to the axis and cross strings extending transversely generally perpendicular to the axis between respective holes of the sides together define a central spot of predetermined longitudinal length and transverse width. The depth of the groove and of the inner side edge is such that the transverse lengths of the cross strings traversing the spot are all substantially identical between the respective outer and inner hole ends.

Description

La présente invention se rapporte à une raquette de tennis comportant des cordes longitudinales et des cordes transversales perpendiculaires à l'axe longitudinal de la raquette, les cordes étant portées par un panier de forme extérieure arrondie, sans aucune partie rectiligne, les deux branches formant la naissance du panier étant reliées par un pont qui, s'il est inversé, c'est-à-dire qu'il présente une courbure identique à celle de la tête du panier, confère, dans la partie médiane de la raquette, une même longueur aux cordes longitudinales.The present invention relates to a tennis racket comprising longitudinal strings and transverse strings perpendicular to the longitudinal axis of the racket, the strings being carried by a basket of rounded external shape, without any rectilinear part, the two branches forming the birth of the basket being connected by a bridge which, if it is reversed, that is to say that it has a curvature identical to that of the head of the basket, gives, in the middle part of the racket, a same length to longitudinal ropes.

Une raquette de tennis est généralement constituée d'une poignée tenue par le joueur, prolongée par des branches portant un panier, de forme ronde ou ovale par exemple, lui-même portant le tamis composé des cordes longitudinales et des cordes transversales, formant la surface de frappe. Chaque corde traverse le panier de part en part, en passant à chaque extrémité à l'intérieur d'un perçage prévu dans le cadre. Dans ce perçage est souvent emmanchée une pièce tubulaire coaxiale de protection du cordage, dite "canon" ou "ceillet", dans laquelle passe la corde.A tennis racket generally consists of a handle held by the player, extended by branches carrying a basket, of round or oval shape for example, itself carrying the sieve composed of the longitudinal strings and the transverse strings, forming the surface typing. Each rope crosses the basket right through, passing at each end inside a hole provided in the frame. In this borehole is often fitted a coaxial tubular piece for protecting the rope, known as a "barrel" or "eyelet", through which the rope passes.

Le chant extérieur du panier est généralement creusé d'une gorge longiligne, coplanaire au tamis, dans laquelle circulent les cordes, de sorte que leurs parties extérieures à l'armature sont protégées.The outside edge of the basket is generally hollowed out by an elongated groove, coplanar with a sieve, in which the strings circulate, so that their parts outside the frame are protected.

Les branches sont reliées par un pont qui constitue la base du panier. Ce pont, qui supporte une extrémité des cordes longitudinales médianes, permet, dans le cas où il est inversé, aux cordes longitudinales médianes d'être d'égales longueurs. Par "longueur" d'une corde, on entend ici à la fois la longueur totale de celle-ci, comprise entre les entrées externes de ses deux oeillets d'extrémité, et aussi la partie de cette corde qui est visible sur le tamis.The branches are connected by a bridge which constitutes the base of the basket. This bridge, which supports one end of the median longitudinal cords, allows, in the case where it is inverted, the median longitudinal cords to be of equal length. By "length" of a cord is meant here both the total length of the latter, comprised between the external inlets of its two end eyelets, and also the part of this cord which is visible on the sieve.

On vise par ce moyen à rendre la déformée de chaque corde longitudinale médiane, sous un impact de balle, identique d'une corde à l'autre. Il n'en est cependant pas de même, sur ce genre de raquette connue, pour les cordes transversales, de sorte que le fonctionnement de la raquette n'est pas optimal.By this means, the aim is to make the deformation of each median longitudinal cord, under a bullet impact, identical from one cord to another. It is however not the same, on this kind of known racket, for the transverse strings, so that the operation of the racket is not optimal.

Il existe bien des raquettes de tennis dont le panier a une forme extérieure approximativement carrée ou rectangulaire, de sorte que la majeure partie des cordes longitudinales et transversales sont d'égales longueurs, mais ces raquettes, en dehors du fait qu'elles sont critiquables sur le plan esthétique, ont un panier dont la forme extérieure est incompatible avec des déformations radiales optimales, sous un impact de balle, ce qui est pourtant essentiel pour obtenir un bon rendement de la raquette: ces déformations radiales optimales sont obtenues, dans l'état actuel des connaissances, par un panier de forme arrondie, sans aucune partie rectiligne.There are many tennis rackets whose basket has an approximately square or rectangular outer shape, so that most of the longitudinal and transverse strings are of equal length, but these rackets, apart from the fact that they are objectionable on aesthetically, have a basket whose external shape is incompatible with optimal radial deformations, under a ball impact, which is however essential to obtain a good performance of the racket: these optimal radial deformations are obtained, in the state current knowledge, by a basket of rounded shape, without any rectilinear part.

Le document FR-A 2 450 114 concerne une raquette de tennis dont la forme intérieure du panier présente des méplats respectivement parallèles et perpendiculaires à l'axe longitudinal médian de la raquette, ce qui confère aux cordes centrales longitudinales et transversales respectivement une longueur égale prise d'intérieur à intérieur de panier. Or, toutes ces cordes ne travaillent pas de la même façon, puisque la partie de chaque corde qui s'allonge sous l'effet de la sollicitation de l'impact de la balle s'apprécie entre les points d'appui de la corde, c'est-à-dire de fond de gorge à fond de gorge.Document FR-A 2 450 114 relates to a tennis racket, the internal shape of the basket having flats respectively parallel and perpendicular to the median longitudinal axis of the racket, which gives the longitudinal and transverse central strings an equal length, respectively. indoor to indoor basket. However, all these cords do not work in the same way, since the part of each cord which lengthens under the effect of the stress of the impact of the ball is appreciated between the points of support of the cord, that is to say from the bottom of the throat to the bottom of the throat.

Le but de l'invention est de fournir une raquette de tennis pour laquelle, dans une zone médiane définie du tamis, centrée préférentiellement sur le centre de percussion, la déformée de chaque corde, transversale et longitudinale, est identique d'une corde de même type à l'autre. Il est à rappeler que le centre de percussion correspond au point où l'impact de balle ne provoque pas de chocs gênants dans la main ou le bras du joueur.The object of the invention is to provide a tennis racket for which, in a defined median zone of the sieve, preferably centered on the percussion center, the deformation of each string, transverse and longitudinal, is identical to a string of the same type to another. It should be remembered that the center of percussion corresponds to the point where the impact of the ball does not cause annoying shocks in the hand or the arm of the player.

Ce but doit être atteint sans augmentation du poids de la raquette par augmentation de l'épaisseur du cadre ou l'ajout d'éléments complémentaires, et sans fragilisation de la raquette par diminution de l'épaisseur du cadre.This object must be achieved without increasing the weight of the racket by increasing the thickness of the frame or the addition of additional elements, and without weakening the racket by reducing the thickness of the frame.

A cet effet, cette raquette de tennis comportant des cordes longitudinales et des cordes transversales perpendiculaires à l'axe longitudinal de la raquette, les cordes étant portées par un panier présentant une ligne extérieure arrondie sans aucune partie rectiligne, avec un pont inversé conférant, dans la partie médiane de la raquette, grâce à sa courbure identique à celle de la tête du panier, une même longueur aux cordes longitudinales, deux tron- cons opposés du panier situés de port et d'autre de l'axe longitudinal, présentant chacun, au moins dans la partie médiane du panier, une gorge, coplanaire au tamis, dans laquelle circulent les cordes transversales après avoir traversé l'armature, les faces internes des deux tronçons opposés du panier étant rectilignes et parallèles à l'axe longitudinal, dans une zone axiale (S) de la partie médiane du panier, est caractérisée en ce que, dans cette zone axiale (S) déterminée de la partie médiane de ces deux tronçons opposés, les fonds de gorge sont rectilignes et parallèles à l'axe longitudinal, afin que les cordes transversales soient, dans cette zone, toutes d'égales longueurs de fond de gorge à fond de gorge.For this purpose, this tennis racket comprising longitudinal strings and transverse strings perpendicular to the longitudinal axis of the racket, the strings being carried by a basket having a rounded outer line without any straight part, with an inverted bridge conferring, in the middle part of the racket, thanks to its curvature identical to that of the head of the basket, the same length with the longitudinal strings, two opposite sections of the basket located at the port and at the other of the longitudinal axis, each having, at least in the middle part of the basket, a groove, coplanar with the sieve, in which the transverse cords circulate after having crossed the frame, the internal faces of the two opposite sections of the basket being rectilinear and parallel to the longitudinal axis, in a axial zone (S) of the middle part of the basket, is characterized in that, in this determined axial zone (S) of the middle part of these two tr opposite onces, the throat bottoms are rectilinear and parallel to the longitudinal axis, so that the transverse strings are, in this zone, all equal lengths from bottom of throat to bottom of throat.

Préférentiellement, ces tronçons sont déterminés de sorte que la zone de frappe définie par l'ensemble des cordes, respectivement longitudinales et transversales, d'égales longueurs, est sensiblement centrée sur le centre de percussion. On obtient ainsi une amélioration de la tolérance au décentrage de la balle lors de l'impact.Preferably, these sections are determined so that the striking zone defined by the set of strings, respectively longitudinal and transverse, of equal length, is substantially centered on the center of percussion. This improves the tolerance to the decentering of the ball during impact.

De toute façon, l'invention sera bien comprise, et ses avantages ainsi que d'autres caractéristiques ressortiront, au cours de la description suivante d'un exemple non limitatif de réalisation, en référence aux dessins annexés dans lesquels:

  • Figure 1 est une vue en plan de cette raquette,
  • Figure 2 est une vue partielle agrandie, avec coupe partielle, du cadre de cette raquette,
  • Figure 3 est une vue en coupe, selon III-111 de la figure 2, au niveau du panier hors de la zone médiane,
  • Figure 4 est une vue en coupe, selon IV-IV de la figure 2, au niveau du panier dans la zone médiane.
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 nonlimiting exemplary embodiment, with reference to the appended drawings in which:
  • FIG. 1 is a plan view of this racket,
  • FIG. 2 is a partial enlarged view, with partial section, of the frame of this racket,
  • FIG. 3 is a sectional view, along III-111 of FIG. 2, at the level of the basket outside the middle zone,
  • Figure 4 is a sectional view, along IV-IV of Figure 2, at the basket in the middle area.

En se reportant à la figure 1, cette raquette de tennis 1 est composée d'une poignée 2 prolongée par des branches 17 portant un panier 3, dont la partie inférieure forme un point inversé 4. Le panier 3 porte lui-même le tamis 5, composé de cordes longitudinales 6 et de cordes transversales 7, formant la surface de frappe.Referring to Figure 1, this tennis racket 1 is composed of a handle 2 extended by branches 17 carrying a basket 3, the lower part of which forms an inverted point 4. The basket 3 itself carries the sieve 5 , composed of longitudinal strings 6 and transverse strings 7, forming the striking surface.

Le pont inversé est une technique connue, conférant, dans la partie médiane de la raquette, une même longueur aux cordes longitudinales. Le panier 3 a une forme extérieure arrondie, sans aucune partie rectiligne, ce qui lui confère une raideur radiale adéquate pour obtenir un bon rendement de la raquette.The inverted bridge is a known technique, giving the longitudinal strings the same length in the middle of the racket. The basket 3 has a rounded external shape, without any straight part, which gives it an adequate radial stiffness to obtain a good performance of the racket.

Comme on le voit mieux sur la figure 2, toutes les cordes, qui sont identiques dans leur matière et de même masse linéique, traversent à chacune de leurs extrémités le panier 3, en passant dans des oeillets tubulaires de protection 8 d'égales longueurs. Elles circulent dans une gorge longiligne 9, coplanaire au tamis 5.As best seen in FIG. 2, all the cords, which are identical in their material and of the same linear mass, pass through each basket 3 at each of their ends, passing through tubular protective eyelets 8 of equal length. They circulate in an elongated groove 9, coplanar with a sieve 5.

Les deux tronçons médians 10, 11, du panier, qui sont situés de part et d'autre de l'axe longitudinal 12 de la raquette, ont, dans un secteur S de longueur L et de position définies, leurs faces intérieures 13, 14 présentant une nervure telle que leurs parties médianes soient rectilignes et parallèles entre elles ainsi qu'à l'axe 12. Par ailleurs, comme on le voit également sur les figures 3 et 4, la profondeur de la gorge 9 est variable dans cette zone de longueur L, croissant progressivement jusqu'en son centre, puis décroissant symétriquement ensuite, de façon que le fond 15 de cette gorge soit, dans cette zone, également rectiligne et parallèle à l'axe 12.The two middle sections 10, 11 of the basket, which are located on either side of the longitudinal axis 12 of the racket, have, in a sector S of length L and defined position, their inner faces 13, 14 having a rib such that their median parts are rectilinear and parallel to each other and to the axis 12. Furthermore, as can also be seen in FIGS. 3 and 4, the depth of the groove 9 is variable in this area of length L, gradually increasing to its center, then decreasing symmetrically thereafter, so that the bottom 15 of this groove is, in this zone, also rectilinear and parallel to the axis 12.

Il en résulte que, sur cette longueur L, toutes les cordes transversales 70 sont d'égales longueurs, d'un fond de gorge à l'autre, et qu'elles sont portées dans leur encastrement de la même manière par des oeillets de protection 8 qui sont identiques et d'égales longueurs.It follows that, over this length L, all the transverse cords 70 are of equal lengths, from one bottom of the throat to the other, and that they are carried in their embedding in the same manner by protective eyelets 8 which are identical and of equal length.

De même que pour les cordes longitudinales médianes 60, ces cordes transversales 70, soumises à la même tension initiale, ayant la même fréquence de vibration et la même vitesse de déplacement, reviendront ainsi en synchronisme après un impact de balle. Leurs énergies élastiques s'additionnent intégralement au moment du renvoi de la balle, ce qui améliore le rendement de la raquette.As with the median longitudinal strings 60, these transverse strings 70, subjected to the same initial tension, having the same frequency of vibration and the same speed of movement, will thus return in synchronism after a bullet impact. Their elastic energies add up completely when the ball is returned, which improves the performance of the racket.

La zone S de longueur L a son centre décalé vers le pont, par rapport au centre géométrique O du panier 3, de façon à ce qu'il coïncide avec le centre de percussion de la raquette.The zone S of length L has its center offset towards the bridge, with respect to the geometric center O of the basket 3, so that it coincides with the center of percussion of the racket.

Avec les cordes longitudinales médianes 60, ces cordes transversales 70, également de mêmes longueurs, définissent une zone de frappe centrale 16 dans laquelle toutes les cordes sont en synchronisme au retour après l'impact de la balle. La zone 16 étant centrée sur le centre de percussion I, on améliore avantageusement la tolérance au décentrage de la balle lors de l'impact, c'est-à-dire que celui-ci pourra s'écarter d'avantage de point que dans les raquettes usuelles sans provoquer de chocs gênants dans la main ou le bras du joueur, et sans affecter significativement le rendement de la raquette.With the median longitudinal strings 60, these transverse strings 70, also of the same length, define a central striking zone 16 in which all the strings are in synchronism with the return after the impact of the ball. The zone 16 being centered on the percussion center I, the tolerance to the decentering of the ball during the impact is advantageously improved, that is to say that the latter may deviate more from the point than in the usual rackets without causing annoying shocks in the hand or the arm of the player, and without significantly affecting the performance of the racket.

Bien entendu, l'invention n'est pas limitée à la forme de réalisation qui vient d'être décrite à titre d'exemple non limitatif. Le décalage centripète des fonds de gorge et/ou des faces internes 14 du panier pourrait par exemple n'exister que dans les zones entourant immédiatement l'extrémité ou les extrémités de chaque canon protecteur de corde. Par ailleurs, il est bien évident que l'on entend ici par "raquette de tennis", non seulement une raquette pour le jeu de tennis proprement dite, mais aussi une raquette pour des jeux de balle du même genre, tels que le squash et le badmington par exemple.Of course, the invention is not limited to the embodiment which has just been described by way of nonlimiting example. The centripetal offset of the groove bottoms and / or the internal faces 14 of the basket could, for example, only exist in the areas immediately surrounding the end or ends of each protective rope barrel. In addition, it is quite obvious that one understands here by "tennis racket", not only a racket for the actual tennis game, but also a racket for ball games of the same kind, such as squash and the badmington for example.

Claims (3)

1. A tennis racket having longitudinal strings (6) and transverse strings (7) perpendicular to the longitudinal axis (12) of the racket, the strings being held by a frame (3) having a rounded exterior shape without any straight part, with an inverted bridge (4) giving at the medial part of the racket, thanks to its curvature being identical to that of the head of the racket, longitudinal strings (6) of the same length, two opposite sections (10, 11) of the frame (3) located on either side of the longitudinal axis each having, at least in the medial part of the frame, a groove (9), coplanar with the mesh, through which the transverse strings pass after passing across the frame, the interior surfaces (13, 14) of the two opposite sections (10, 11) of the frame (3) being straight and parallel to the longitudinal axis (12), in the axial zone (S) of the medial part of the frame, characterized in that, in this axial zone (S) determined by the medial part of these two opposite sections (10, 11) the groove's bases (15) are straight and parallel to the longitudinal axis (12), in order for the transverse strings (70) in this zone (S) to be all of equal length from groove base to groove base.
2. A tennis racket according to Claim 1, characterized in that the zone (S) is determined so as to cause the striking zone (16) defined by the strings of equal length as a whole being longitudinal (60) and transverse (70) respectively, as a whole, to be centered approximately on the centre of impact (I).
3. A racket according to Claims 1 and 2 of the type having at the ends of each string tubular eyes or protective barrels (8) passing through the arms (10, 11) of the frame (3), characterized in that the tubular eyes or barrels (8) are all of equal length in the zone (S) where the groove bases (15) and the interior surfaces (13, 14) of the two opposite sections (10, 11) of the frame are parallel to the axis of the racket.
EP87420238A 1986-09-11 1987-09-11 Tennis racket Expired - Lifetime EP0260208B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87420238T ATE55698T1 (en) 1986-09-11 1987-09-11 TENNIS RACKET.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8612955 1986-09-11
FR8612955A FR2603813B1 (en) 1986-09-11 1986-09-11 TENNIS RACKET

Publications (2)

Publication Number Publication Date
EP0260208A1 EP0260208A1 (en) 1988-03-16
EP0260208B1 true EP0260208B1 (en) 1990-08-22

Family

ID=9339004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87420238A Expired - Lifetime EP0260208B1 (en) 1986-09-11 1987-09-11 Tennis racket

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US (1) US4834383A (en)
EP (1) EP0260208B1 (en)
JP (1) JPS6346168U (en)
AT (1) ATE55698T1 (en)
DE (1) DE3764434D1 (en)
FR (1) FR2603813B1 (en)

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FR2630920B1 (en) * 1988-05-05 1991-01-11 Lacoste Sa Chemise TENNIS RACKET
US4964635A (en) * 1989-04-14 1990-10-23 Fitzgerald Gary C Tennis racket
US5082266A (en) * 1990-08-30 1992-01-21 Lo Kun Nan Racket head with inner peripheral indentations
US5299801A (en) * 1991-05-23 1994-04-05 Donnay International S.A. Tennis racket
JP2508947B2 (en) * 1991-07-29 1996-06-19 ヤマハ株式会社 Racket frame for tennis
US5184818A (en) * 1991-11-14 1993-02-09 Lo Kun Nan Metal racket
US5312102A (en) * 1993-02-04 1994-05-17 Lisco, Inc. Variable inertia head racket
JP2690671B2 (en) * 1993-03-16 1997-12-10 住友ゴム工業株式会社 tennis racket
US6132325A (en) * 1997-06-25 2000-10-17 Bertolotti; Fabio P Interlocking string network for sport rackets
US6506134B2 (en) 1997-06-25 2003-01-14 Fabio Paolo Bertolotti Interlocking string network for sports rackets
JP4511675B2 (en) * 2000-03-10 2010-07-28 ブリヂストンスポーツ株式会社 racket
US6344006B1 (en) * 2000-11-17 2002-02-05 Richard A. Brandt Sports racket having a uniform string structure
ITBG20030010A1 (en) * 2003-02-07 2004-08-08 Benetton Group S P A Ora Benetton Trading Usa In SPORTS RACKET STRUCTURE WITH HEAD PROVIDED WITH
US7077768B2 (en) * 2004-05-27 2006-07-18 Ef Composite Technologies, L.P. Composite racquet with double tube head frame
WO2006029170A2 (en) * 2004-09-07 2006-03-16 Brandt Richard A Tennis racket having a primarily rectangular shape
US7806789B2 (en) * 2007-05-03 2010-10-05 John L Sledge Sports racket
JP6196786B2 (en) * 2013-03-06 2017-09-13 ヨネックス株式会社 racket
ES2899173T3 (en) 2017-12-04 2022-03-10 Aico S P A Biomass stove with reduced emissions

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US3917267A (en) * 1973-03-23 1975-11-04 Charles A Mcgrath Tennis racket
NL7710635A (en) * 1977-09-29 1979-04-02 Philips Nv METHOD OF MANUFACTURING A SEMICONDUCTOR DEVICE.
FR2450114A1 (en) * 1979-02-28 1980-09-26 Agosto Leon Frame for sports racquet - has internal symmetrical flat surfaces arranged as polygon so that string lengths and tensions are equal
FR2455906A3 (en) * 1979-05-08 1980-12-05 Rossignol Sa Tennis racquet with forked handle - has bridge joining two arms of handle with curvature equal to that of opposite part of frame
US4394014A (en) * 1981-04-27 1983-07-19 Balaban J A Tennis racket
US4512575A (en) * 1982-11-30 1985-04-23 Tzeng Kuo Nan Racquet having strings of equal length
US4662634A (en) * 1984-05-31 1987-05-05 Chris Development Corporation Tennis racket with convex throat
ZA852092B (en) * 1984-07-31 1985-11-27 Cons Sporting Goods Tapered racquet
DE3521117A1 (en) * 1985-06-13 1985-10-31 Jürgen 8500 Nürnberg Richter Method for stringing rackets used in games, especially tennis rackets

Also Published As

Publication number Publication date
JPS6346168U (en) 1988-03-29
ATE55698T1 (en) 1990-09-15
FR2603813A1 (en) 1988-03-18
FR2603813B1 (en) 1989-05-12
DE3764434D1 (en) 1990-09-27
EP0260208A1 (en) 1988-03-16
US4834383A (en) 1989-05-30

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