EP0260208B1 - Tennisschläger - Google Patents

Tennisschläger 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
Authority
EP
European Patent Office
Prior art keywords
frame
strings
racket
crown
axis
Prior art date
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
Application number
EP87420238A
Other languages
English (en)
French (fr)
Other versions
EP0260208A1 (de
Inventor
Gilles Du Gardin
Dominique Deville
Maurice Woehrle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Skis Rossignol SA
Original Assignee
Skis Rossignol SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Skis Rossignol SA filed Critical Skis Rossignol SA
Priority to AT87420238T priority Critical patent/ATE55698T1/de
Publication of EP0260208A1 publication Critical patent/EP0260208A1/de
Application granted granted Critical
Publication of EP0260208B1 publication Critical patent/EP0260208B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Pulmonology (AREA)
  • Golf Clubs (AREA)
  • Laminated Bodies (AREA)
  • Fishing Rods (AREA)
  • Polarising Elements (AREA)
  • Prostheses (AREA)
  • Tires In General (AREA)

Claims (3)

1. Tennisschläger, umfassend Längssaiten (6) und senkrecht zur Längsachse (12) des Schlägers verlaufende Quersaiten (7), wobei die Saiten von einem eine abgerundete Außenkontur ohne einen geraden Abschnitt aufweisenden Schlägerkopf (3) mit einer umgedrehten Brücke (4) gehalten werden, die in dem mittleren Abschnitt des Schlägers aufgrund ihrer zu der Spitze des Schlägerkopfes gleichen Krümmung den Längssaiten (6) eine gleiche Länge verleiht, wobei weiter zwei gegenüberliegende, beidseits der Längsachse angeordnete Teilabschnitte (10, 11) des Schlägerkopfes (3) jeweils wenigstens in dem mittleren Abschnitt des Schlägerkopfes eine zur Bespannung koplanare Vertiefung (9) aufweisen, in welcher die Quersaiten, nachdem sie den Rahmen durchsetzt haben, ihre Durchquerungsrichtung umkehren, und wobei die innenliegenden Flächen (13, 14) der zwei gegenüberliegenden Teilabschnitte (10, 11) des Schlägerkopfes (3) gerade und parallel zu der Längsachse (12) in einem axialen Bereich (S) des mittleren Abschnittes des Schlägerkopfes sind, dadurch gekennzeichnet, daß in diesem axialen Bereich (S), der von dem mittleren Abschnitt der beiden gegenüberliegenden Teilabschnitte (10, 11) bestimmt ist, die Böden der Vertiefung (15) geradlinig und parallel zur Längsachse (12) sind, so daß in diesem Bereich (S) die Quersaiten (70) die gleiche Länge von dem einen Boden der Vertiefung zu dem gegenüberliegenden Boden der Vertiefung aufweisen.
2. Tennisschläger nach Anspruch 1, dadurch gekennzeichnet, daß der Bereich (S) in der Weise festgelegt ist, daß die Schlagzone (16), die durch die Gruppe gleichlanger Längs- (60) und Quersaiten (70) gebildet ist, im wesentlichen auf dem Schlagzentrum (I) zentriert ist.
3. Schläger nach Anspruch 1 und 2, umfassend an den Enden jeder Saite rohrförmige Schutzösen oder Schutzhülsen (8), welche die Arme (10, 11) des Schlägerkopfes (3) durchsetzen, dadurch gekennzeichnet, daß die rohrförmigen Ösen oder Hülsen (8) in dem Bereich (S) die gleiche Länge besitzen, wo die Böden der Vertiefung (15) und die innenliegenden Flächen (13, 14) der beiden gegenüberliegenden Teilabschnitte (10, 11) des Schlägerkopfes parallel zu der Achse des Schlägers sind.
EP87420238A 1986-09-11 1987-09-11 Tennisschläger Expired - Lifetime EP0260208B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87420238T ATE55698T1 (de) 1986-09-11 1987-09-11 Tennisschlaeger.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8612955A FR2603813B1 (fr) 1986-09-11 1986-09-11 Raquette de tennis
FR8612955 1986-09-11

Publications (2)

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

Family

ID=9339004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87420238A Expired - Lifetime EP0260208B1 (de) 1986-09-11 1987-09-11 Tennisschläger

Country Status (6)

Country Link
US (1) US4834383A (de)
EP (1) EP0260208B1 (de)
JP (1) JPS6346168U (de)
AT (1) ATE55698T1 (de)
DE (1) DE3764434D1 (de)
FR (1) FR2603813B1 (de)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2630920B1 (fr) * 1988-05-05 1991-01-11 Lacoste Sa Chemise Raquette pour le tennis
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 (ja) * 1991-07-29 1996-06-19 ヤマハ株式会社 テニス用ラケットフレ―ム
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 (ja) * 1993-03-16 1997-12-10 住友ゴム工業株式会社 テニスラケット
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 (ja) * 2000-03-10 2010-07-28 ブリヂストンスポーツ株式会社 ラケット
US6344006B1 (en) 2000-11-17 2002-02-05 Richard A. Brandt Sports racket having a uniform string structure
ITBG20030010A1 (it) * 2003-02-07 2004-08-08 Benetton Group S P A Ora Benetton Trading Usa In Struttura di racchetta sportiva con testa provvista di
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 (ja) * 2013-03-06 2017-09-13 ヨネックス株式会社 ラケット
EP3492814B1 (de) 2017-12-04 2021-08-25 Aico S.p.A. Biomasseoven mit gesenkten emissionen

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3917267A (en) * 1973-03-23 1975-11-04 Charles A Mcgrath Tennis racket
NL7710635A (nl) * 1977-09-29 1979-04-02 Philips Nv Werkwijze voor het vervaardigen van een halfgeleiderinrichting.
FR2450114A1 (fr) * 1979-02-28 1980-09-26 Agosto Leon Cadre de raquette permettant au centre tension et longueur egale des cordes
FR2455906A3 (fr) * 1979-05-08 1980-12-05 Rossignol Sa Raquette de tennis
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 (de) * 1985-06-13 1985-10-31 Jürgen 8500 Nürnberg Richter Verfahren zum bespannen von spielschlaegern, insbesondere von tennisschlaegern

Also Published As

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

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