EP0176021A2 - Raquette de tennis - Google Patents

Raquette de tennis Download PDF

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Publication number
EP0176021A2
EP0176021A2 EP85111713A EP85111713A EP0176021A2 EP 0176021 A2 EP0176021 A2 EP 0176021A2 EP 85111713 A EP85111713 A EP 85111713A EP 85111713 A EP85111713 A EP 85111713A EP 0176021 A2 EP0176021 A2 EP 0176021A2
Authority
EP
European Patent Office
Prior art keywords
racket
height
handle
cross
ball
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.)
Granted
Application number
EP85111713A
Other languages
German (de)
English (en)
Other versions
EP0176021B1 (fr
EP0176021A3 (en
Inventor
Siegfried Kuebler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP88202025A priority Critical patent/EP0310169B2/fr
Priority to AT85111713T priority patent/ATE63836T1/de
Publication of EP0176021A2 publication Critical patent/EP0176021A2/fr
Publication of EP0176021A3 publication Critical patent/EP0176021A3/de
Application granted granted Critical
Publication of EP0176021B1 publication Critical patent/EP0176021B1/fr
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
    • 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
    • A63B2049/0211—Frames with variable thickness of the head in a direction perpendicular to the string plane
    • 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
    • A63B60/002—Resonance frequency related characteristics

Definitions

  • the invention relates to a racket for games with a limited elastic ball, in particular tennis rackets, with a covering provided in a clamping frame, a heating zone adjoining the clamping frame and an end handle.
  • Such a conventional tennis racket has a height of the uncovered handle of 23 to 32 mm, and the height of the tensioning frame - seen in the direction of impact, that is to say at right angles to the stringing - is below the handle thickness. OS 30 18 354 reproduced.
  • the basic idea leads to the solution of this task.
  • the resonance frequency of the strung racket which is fixed to the handle, approximately to the time period in which the ball remains in contact with the covering;
  • the natural frequency of the racket with the excitation frequency of the ball - i.w. agree, that is 83 to 200 Hz, preferably 100 to 140 Hz.
  • the ball contact is 2.5 to 6 ms for half a vibration. Thanks to these specifications, a racket is created that completely fulfills the task seen by the inventor.
  • the racket according to the invention - which corresponds to known rackets insofar as its tensioning frame or a profile rod resulting from it has a cross-sectional width between 8 and 16 mm measured in the plane of the covering - has an moment of inertia which is 4 to 16 times higher than the moment of inertia of a tennis racket according to the prior art, the cross-sectional height of which is equal to or less than the thickness of its handle.
  • the latter is determined by the human hand and therefore remains without influence on the club design.
  • the foregoing proviso applies the ratio of Hand g riffdicke to the height of a cross section for a profiled bar, from which the clamping frame is made and which extends over the clamping frame out of the core region to the handle.
  • the height of the cross-section of the profile bar and / or stenter has proven to be a measure above the thickness of the handle up to approximately 45 mm.
  • the height of the cross section or profile of the racket or stenter which is perpendicular to the covering, increases in relation to the handle thickness abruptly or gradually and can decrease - abruptly or gradually - from the point of greatest extent to the club head.
  • the racket has thus proven to be advantageous for the racket to have its greatest height in the heart zone and to taper both towards the handle and towards the club head, that is to say in both directions of the longitudinal axis, with its greatest height preferably remaining constant in an area running on both sides of the heart zone is.
  • the greatest height of the racket is arranged at the transition to the handle - the racket or cross-sectional height can decrease from this transition or at a distance from it towards the racket head.
  • the decrease may take place continuously with the creation of a straight longitudinal section for the profile, but it is also possible to produce the contour curved or curved.
  • the configuration of the heart zone as a narrow frame web, the height of which is less than the height of the profile bar.
  • the longitudinal axis of the racket is also an axis of symmetry, i. H. the cross-section of the clamping frame described is on the other side of the axis of symmetry a corresponding cross-section.
  • the covering determines a plane of symmetry according to a feature of the invention.
  • a tennis racket 10 of known type shown by way of example in FIGS. 1 to 3 has an oval clamping frame 12 made of a correspondingly curved profile bar 13, which ends on both sides of the racket longitudinal axis M in - defining a plate-shaped heart 14 - profile arms 15.
  • the latter are fixed in a handle 16 with a thickness i of 26 to 32 mm; the thickness i is measured on handles 16 without wrapping leather and without considering a handle cap 17.
  • Tensioning frame 12 and heart 14 surround a stringing surface Q composed of transverse strings 18 and longitudinal strings 19 crossing them.
  • the preferred point of impact for a tennis ball (not shown) is designated by S in FIG. 1.
  • the tensioning frame 12 or its profile bar 13 is rectangular in cross section, the side walls 20 of which run, for example, at a distance a of 7 mm and the transverse walls 21 of which run at a distance b of 17 mm.
  • the outer width m is 11 mm and the outer height n is 21 mm. The latter is otherwise far lower than the thickness i of the handle 16.
  • the natural frequency f o of the tennis racket 10 clamped in accordance with the diagram according to FIG. 5 can be measured by an action on the longitudinal axis M of the racket Force P is suddenly removed.
  • the dimension d is proportional to the deflection of the force P made clear in FIG. 5. But it is also related to the natural frequency of the tennis racket 10 in the longitudinal direction; If a tennis racket has a deflection of d 1 and another one of d 2 under the same force P, the natural frequency of the second tennis racket can be calculated approximately according to the following relationship:
  • Fig. 4 shows a vibration curve in the longitudinal direction for a conventional tennis racket D according to Fig. 1 to 3.
  • a ball touches the net of covering Q and forces the tenter 12 to follow the ball frequency. This movement seeks to counteract dynamic inertial forces of the tenter frame 12.
  • Arrived at point B the ball reverses its direction and leaves the string Q following the ball approximately at point C.
  • the design of a tennis racket 30 according to FIGS. 6 to 8 has a resonance frequency, which remedies the described defect;
  • the cross section of the profile rod 33 contains the following dimensions according to FIG. 8 : as the result of a calculation which confirms the agreement of the natural frequency of this tennis racket 30 and the "ball resonance", that is to say the agreement of the excitation frequency with the natural frequency.
  • the calculable cross-sectional area is here is therefore equal to the cross-sectional area of tennis racket 10, which is referred to below as TS 10 .
  • d 10 deflection of TS 10
  • d 30 deflection of tennis racket 30 (TS 30 )
  • FR 10 natural resonance of TS 10 50 Hz *)
  • the deflection under a load P must be 1/6 compared to TS 10 with TS 30 .
  • the deflection d is a function of .
  • the resonance frequency is One assumes so is
  • FIG. 7 shows a frame shape that takes these findings into account, in which an area E with a projecting profile height n extends on both sides of a frame web 34.
  • the profile height n decreases steadily from the area E to the club head 40 on the one hand and to the handle attachment 41.
  • the frame web 34 shown in section in FIG. 7 replaces the previously described heart 14 and has a lower average profile height h than the profile bar 33.
  • the vibration behavior of the tennis racket 30 according to the invention in the longitudinal direction can be seen in FIG. 9.
  • the excitation frequency of the ball now corresponds to its natural frequency.
  • the tennis racket 30 has reached point C or in the immediate vicinity thereof, and in addition to an additional acceleration from the clamping frame 32 of the tennis racket 30, the ball receives an exact trajectory which is no longer distorted by the dimension Z of the deflection is, as shown in Fig. 4. If inaccurate - d. H. outside the longitudinal axis M on the tennis racket 30 or its strings Q-striking balls, a torsional vibration occurs about the longitudinal axis M. This torsional vibration is superimposed on the longitudinal vibration.
  • the entire tennis racket 30 only vibrates sinusoidally at a frequency when it touches the ball and also compensates for torsional deflection by timely swinging back.
  • the handles 16 of the tennis racket 30 (FIGS. 6 to 8) and the embodiments 30 a to 30 c shown in FIGS. 10 to 12 a are of conventional thickness i, which - as said - measures 23 to 32 mm, opposite this thickness i have the subsequent profile bars - better referred to for their changing heights as frame profiles 33 - in all cases a longer outer height n l .
  • the frame profile 33 b of FIG. 11 is a total of that max. Height n l , while the max. Height n 1 of frame profile 33 c (FIG. 12) ends approximately at heart zone H and decreases as height n 0 to club head 40.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Pulmonology (AREA)
  • Golf Clubs (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Toys (AREA)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)
EP85111713A 1984-09-22 1985-09-17 Raquette de tennis Expired - Lifetime EP0176021B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP88202025A EP0310169B2 (fr) 1984-09-22 1985-09-17 Raquettes pour jeux de balles, en particulier raquettes de tennis
AT85111713T ATE63836T1 (de) 1984-09-22 1985-09-17 Tennisschlaeger.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843434956 DE3434956A1 (de) 1984-09-22 1984-09-22 Schlaeger fuer spiele mit begrenzt elastischem ball
DE3434956 1984-09-22

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP88202025.8 Division-Into 1985-09-17

Publications (3)

Publication Number Publication Date
EP0176021A2 true EP0176021A2 (fr) 1986-04-02
EP0176021A3 EP0176021A3 (en) 1986-10-08
EP0176021B1 EP0176021B1 (fr) 1991-05-29

Family

ID=6246171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85111713A Expired - Lifetime EP0176021B1 (fr) 1984-09-22 1985-09-17 Raquette de tennis

Country Status (4)

Country Link
US (1) US4664380A (fr)
EP (1) EP0176021B1 (fr)
AT (1) ATE63226T1 (fr)
DE (5) DE3434956A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0168041A2 (fr) * 1984-07-10 1986-01-15 Sumitomo Rubber Industries Limited Instrument pour battre la balle
GB2203953A (en) * 1987-04-28 1988-11-02 Yamaha Corp Racket frames
EP0317711A2 (fr) * 1987-08-04 1989-05-31 Wilson Sporting Goods Company Raquettes pour jeux de balles
FR2626186A1 (fr) * 1988-01-23 1989-07-28 Yonex Kk Raquette de tennis
AT393967B (de) * 1989-09-11 1992-01-10 Head Sportgeraete Gmbh Ballschlaeger, insbesondere tennisschlaeger
US5080361A (en) * 1989-07-19 1992-01-14 Skis Rossignol S.A. Racket for ball games
EP0477533A1 (fr) * 1990-08-21 1992-04-01 Wilson Sporting Goods Company Raquette de tennis
US5249798A (en) * 1991-07-09 1993-10-05 Sumitomo Rubber Industries, Ltd. Tennis racket frame
US5277422A (en) * 1991-09-27 1994-01-11 Dunlop Limited Games racket frame
US10328316B1 (en) 2018-03-12 2019-06-25 Wilson Sporting Goods Co. Racquet configured with increased flexibility in multiple directions with respect to a longitudinal axis

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3735069A1 (de) * 1986-10-17 1988-06-16 Siegfried Kuebler Tennisschlaeger
JPH0429624Y2 (fr) * 1987-11-17 1992-07-17
US5211398A (en) * 1988-02-19 1993-05-18 Yamaha Corporation Hollow tennis racket frame with matched frequency of vibration
JP2625825B2 (ja) * 1988-02-19 1997-07-02 ヤマハ株式会社 ラケットフレーム
US5037098A (en) * 1988-04-06 1991-08-06 Prince Manufacturing, Inc. Tennis racquet with tapered profile frame
US5037097A (en) * 1988-08-18 1991-08-06 Athletic Alternatives, Inc. Sports racket
US4903967A (en) * 1989-01-27 1990-02-27 Ferrari Importing Company, Inc. Racket frame having holes for tailoring frame stiffness
US5029859A (en) * 1989-04-10 1991-07-09 Prince Manufacturing, Inc. Protective bumper strip, especially for wide body tennis racquets
US4997186A (en) * 1989-12-08 1991-03-05 Ferrari Importing Company, Inc. Racket frame having multi-dimensional cross-sectional construction
US5211396A (en) * 1990-03-16 1993-05-18 Ferrari Importing Company Multi-frame racket
US5005834A (en) * 1990-03-16 1991-04-09 Ferrari Importing Company Multi-frame racket
US5071124A (en) * 1990-05-03 1991-12-10 Prince Manufacturing, Inc Badminton racquet
US5062634A (en) * 1990-08-31 1991-11-05 Wilson Sporting Goods Co. Squash racket
US5048830A (en) * 1990-09-20 1991-09-17 Lo Kun Nan Racket frame with shock absorbing characteristics
DE4116901A1 (de) * 1991-05-23 1992-11-26 Donnay Int Sa Tennisschlaeger
DE4037568A1 (de) * 1990-11-26 1992-05-27 Donnay Int Sa Tennisschlaeger
US5299801A (en) * 1991-05-23 1994-04-05 Donnay International S.A. Tennis racket
US5417418A (en) * 1992-12-10 1995-05-23 Prince Manufacturing, Inc. Monoshaft composite tennis racquet
US5257781A (en) * 1993-01-19 1993-11-02 Mitt Usa Corporation Retained rocker string sports racket
US5312102A (en) * 1993-02-04 1994-05-17 Lisco, Inc. Variable inertia head racket
US5368295A (en) * 1993-06-02 1994-11-29 Wilson Sporting Goods Co. Tennis racket
AT406734B (de) * 1993-08-05 2000-08-25 Degaris Kenneth Godfrey Schlägerrahmen
US6383099B1 (en) * 1995-05-22 2002-05-07 Wilson Sporting Goods Co. Tennis racquet
US5810683A (en) * 1996-12-23 1998-09-22 Prince Sports Group, Inc. Morph frame for sports racquet
US5913740A (en) * 1997-07-25 1999-06-22 Miklos; Edward J. Flat beam aerodynamic tennis racquet
US6062994A (en) * 1998-04-10 2000-05-16 Ef Composite Technologies, L.P. Reinforced racquet with flat string bed
DE19825075A1 (de) * 1998-06-04 2000-02-10 Peter Weidenschlager Tennisschläger
DE19953626B4 (de) * 1999-11-08 2004-02-05 Head Sport Ag Schläger für Ballspiele
US6447412B1 (en) 2000-04-18 2002-09-10 Ef Composite Technologies, L.P. Sports racket with undulations in frame interior surface
US20080026658A1 (en) * 2002-03-07 2008-01-31 Matthew Kriesel Multi-axially stretchable polymer shock absorbing pad
DE20305073U1 (de) 2003-03-24 2004-09-16 Turzer, Harald Ballschläger
GB0319259D0 (en) * 2003-08-15 2003-09-17 Imp College Innovations Ltd Tennis racket
US8302213B2 (en) * 2004-10-08 2012-11-06 Ig Holdings Llc Helmets and vests

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539019A (en) 1924-02-07 1925-05-26 John P Nikonow Tennis racket
DE3018354A1 (de) 1980-05-14 1981-11-19 Kuebler & Co, 7700 Singen Schlaeger fuer tennis o.dgl. spiele

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB327796A (en) * 1929-02-04 1930-04-17 Robert John Nash Improvements in racquets for games and in the manufacture thereof
GB415707A (en) * 1933-02-28 1934-08-28 George Stanley Milne Improvements in badminton rackets
FR827983A (fr) * 1937-10-15 1938-05-06 Raquette perfectionnée pour jeu de tennis et jeux analogues
US2171223A (en) * 1937-12-02 1939-08-29 Roy H Robinson Racket for tennis and batting games and method of manufacturing same
US3809402A (en) * 1969-01-02 1974-05-07 Dunlop Holdings Ltd Tennis rackets and frames therefor
US3647211A (en) * 1970-06-08 1972-03-07 James H Doessel Plastic tennis racket having predetermined cross sections effecting flexibility
US3640533A (en) * 1970-07-08 1972-02-08 Tyler B Davis Reinforcing facing for a strung racket
FR2195163A5 (fr) * 1972-08-02 1974-03-01 Martel Rene
US4291574A (en) * 1976-01-05 1981-09-29 Frolow Jack L Tennis racket
US4165071A (en) * 1976-01-05 1979-08-21 Frolow Jack L Tennis racket
US4196901B1 (en) * 1977-03-07 1998-05-26 Enoch J Durbin Tennis racquet
US4297308A (en) * 1978-03-07 1981-10-27 Dunlop Limited Method of manufacturing games rackets
US4367874A (en) * 1979-01-04 1983-01-11 Starwin Industries, Inc. Tennis racquet and method of making same
US4293129A (en) * 1979-05-21 1981-10-06 Planakis Leo N Game rackets and paddles with nonparallel playing surfaces
DE2920680A1 (de) * 1979-05-22 1980-12-04 Marsteller & Killmann Kg Ballschlaeger, insbesondere tennisschlaeger
US4280699A (en) * 1980-01-25 1981-07-28 Leach Industries Game racquet
US4438925A (en) * 1982-02-09 1984-03-27 Lindstrom James A Handle for racquetball racquet

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539019A (en) 1924-02-07 1925-05-26 John P Nikonow Tennis racket
DE3018354A1 (de) 1980-05-14 1981-11-19 Kuebler & Co, 7700 Singen Schlaeger fuer tennis o.dgl. spiele

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
AUFSATZ: "Physics of the tennis racket", AMERICAN JOURNAL OF PHYSICS, June 1979 (1979-06-01), pages 482 - 487

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4928965A (en) * 1984-07-10 1990-05-29 Sumitomo Rubber Industries, Ltd. Golf club and method of designing same
EP0168041A3 (en) * 1984-07-10 1987-08-26 Sumitomo Rubber Industries Limited A ball striking instrument
EP0168041A2 (fr) * 1984-07-10 1986-01-15 Sumitomo Rubber Industries Limited Instrument pour battre la balle
GB2203953B (en) * 1987-04-28 1991-09-04 Yamaha Corp An improved racket frame
FR2614541A1 (fr) * 1987-04-28 1988-11-04 Yamaha Corp Cadre de raquette ameliore
GB2203953A (en) * 1987-04-28 1988-11-02 Yamaha Corp Racket frames
EP0317711A2 (fr) * 1987-08-04 1989-05-31 Wilson Sporting Goods Company Raquettes pour jeux de balles
EP0317711A3 (en) * 1987-08-04 1990-05-16 Wilson Sporting Goods Company Racket for playing a game with a ball
FR2626186A1 (fr) * 1988-01-23 1989-07-28 Yonex Kk Raquette de tennis
AU604881B2 (en) * 1988-01-23 1991-01-03 Yonex Kabushiki Kaisha Tennis racket
US5080361A (en) * 1989-07-19 1992-01-14 Skis Rossignol S.A. Racket for ball games
AT393967B (de) * 1989-09-11 1992-01-10 Head Sportgeraete Gmbh Ballschlaeger, insbesondere tennisschlaeger
US5540434A (en) * 1990-08-21 1996-07-30 Wilson Sporting Goods Co. Tennis racket
EP0477533A1 (fr) * 1990-08-21 1992-04-01 Wilson Sporting Goods Company Raquette de tennis
US5249798A (en) * 1991-07-09 1993-10-05 Sumitomo Rubber Industries, Ltd. Tennis racket frame
US5277422A (en) * 1991-09-27 1994-01-11 Dunlop Limited Games racket frame
US10328316B1 (en) 2018-03-12 2019-06-25 Wilson Sporting Goods Co. Racquet configured with increased flexibility in multiple directions with respect to a longitudinal axis
EP3539623A1 (fr) * 2018-03-12 2019-09-18 Wilson Sporting Goods Co. Raquette conçue avec une flexibilité accrue dans plusieurs directions par rapport à un axe longitudinal
JP2019155060A (ja) * 2018-03-12 2019-09-19 ウィルソン・スポーティング・グッズ・カンパニーＷｉｌｓｏｎ Ｓｐｏｒｔｉｎｇ Ｇｏｏｄｓ Ｃｏｍｐａｎｙ 縦軸線に関して複数方向の可撓性を高めた構成のラケット
CN110251906A (zh) * 2018-03-12 2019-09-20 威尔逊运动货品公司 构造成相对于纵向轴线在多个方向上具有增大的柔韧性的球拍
US10646753B2 (en) 2018-03-12 2020-05-12 Wilson Sporting Goods Co. Racquet configured with increased flexibility in multiple directions with respect to a longitudinal axis
US10653924B2 (en) 2018-03-12 2020-05-19 Wilson Sporting Goods Co. Racquet configured with increased flexibility in multiple directions with respect to a longitudinal axis
US10751581B2 (en) 2018-03-12 2020-08-25 Wilson Sporting Goods Co. Racquet configured with increased flexibility in multiple directions with respect to a longitudinal axis
US10946253B2 (en) 2018-03-12 2021-03-16 Wilson Sporting Goods Co. Racquet configured with increased flexibility in multiple directions with respect to a longitudinal axis
CN110251906B (zh) * 2018-03-12 2022-05-13 威尔逊运动货品公司 构造成相对于纵向轴线在多个方向上具有增大的柔韧性的球拍
US11541282B2 (en) 2018-03-12 2023-01-03 Wilson Sporting Goods Co. Racquet configured with increased flexibility in multiple directions with respect to a longitudinal axis
US11986706B2 (en) 2018-03-12 2024-05-21 Wilson Sporting Goods Co. Racquet configured with increased flexibility in multiple directions with respect to a longitudinal axis
US11986705B2 (en) 2018-03-12 2024-05-21 Wilson Sporting Goods Co. Racquet configured with increased flexibility in multiple directions with respect to a longitudinal axis

Also Published As

Publication number Publication date
DE3582805D1 (de) 1991-06-13
DE3582987D1 (de) 1991-07-04
US4664380A (en) 1987-05-12
EP0176021B1 (fr) 1991-05-29
DE3434898C2 (fr) 1993-06-24
EP0176021A3 (en) 1986-10-08
DE8427999U1 (de) 1987-03-26
DE3434898A1 (de) 1986-04-17
DE3434956A1 (de) 1986-04-03
ATE63226T1 (de) 1991-05-15

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