EP0760245B1 - Tennis racket - Google Patents
Tennis racket Download PDFInfo
- Publication number
- EP0760245B1 EP0760245B1 EP96890135A EP96890135A EP0760245B1 EP 0760245 B1 EP0760245 B1 EP 0760245B1 EP 96890135 A EP96890135 A EP 96890135A EP 96890135 A EP96890135 A EP 96890135A EP 0760245 B1 EP0760245 B1 EP 0760245B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- racket
- gravity
- tennis
- tennis racket
- free
- 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
Links
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
-
- 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
- A63B49/038—Frames with head subframes for replacing strings
-
- 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
- A63B49/10—Frames made of non-metallic materials, other than wood
-
- 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
-
- 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
- A63B60/0081—Substantially flexible shafts; Hinged shafts
-
- 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
-
- 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
- A63B2049/0201—Frames with defined head dimensions
- A63B2049/0202—Frames with defined head dimensions surface area
-
- 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
- A63B2049/0201—Frames with defined head dimensions
- A63B2049/0203—Frames with defined head dimensions height
-
- 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
- A63B2049/0201—Frames with defined head dimensions
- A63B2049/0204—Frames with defined head dimensions width
-
- 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
- A63B2049/0207—Frames with defined overall length
-
- 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
- A63B2049/0212—Frames with defined weight
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2209/00—Characteristics of used materials
- A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres
- A63B2209/023—Long, oriented fibres, e.g. wound filaments, woven fabrics, mats
-
- 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
Definitions
- the invention relates to tennis rackets, in particular Tennis rackets that are lighter, stiffer, top heavy and longer than conventional tennis rackets.
- Conventional known tennis rackets have a weight of around 420 g, a club length of around 66 cm, a focus of around 33 cm and a dynamic focus about 42 cm from the end of the club.
- the racket material consisted of wood, with which one Club natural frequency in first mode with free-free suspension of about 90 Hz.
- a tennis racket is presented in US-A-1 539 019 (Nikonow), the lighter, stiffer and more top-heavy than conventional ones Racket is.
- Such a racket weighs approximately 340 g
- the center of gravity is around 41 cm, its dynamic center of gravity about 50 cm from the end of the handle.
- the bat draws are more rigid than conventional rackets.
- US-A-4 165 071 is also one compared to conventional ones Tennis rackets lighter, stiffer and more top heavy Remove tennis racket.
- the racket has one Weight less than 280 g, a distance from the center of gravity to the Handle end of more than 38 cm, a dynamic focus, the is more than 50 cm from the end of the handle and a free-free Natural frequency in the first mode greater than 155 Hz.
- US-A-5 368 295 (Severa) is also lighter in weight, higher rigidity and top-heaviness than conventional tennis rackets on.
- the weight is less than 270 g
- the focus here is more than 39 cm and the dynamic Center of gravity more than 50 cm from the end of the handle. In the first In fashion, the racket reaches a free-free natural frequency of 190 Hz.
- the invention is now aimed at a tennis racket at the beginning to create the type mentioned, by reducing weight, Increase in stiffness, top heaviness and greater Overall length the punch technique and punch power increased and thus the quality of the game can be improved with greater comfort.
- the invention essentially consists in that the tennis racket is a stringed combination Total weight less than 245 g, a total length greater than 70 cm, a free-free natural frequency in the first mode of higher than 210 Hz, a center of gravity of more than 41 cm and a dynamic Center of gravity of more than 50 cm, measured from the end of the handle, having.
- the lower weight of the racket is immediate ligament, joint and muscle-protecting effect, which in particular prevents the formation of tennis arms (epicondylitis) becomes.
- the reduction in club weight causes also a reduction in the player's premature fatigue.
- the stiffness of the racket has an immediate impact on the dissipation energy that is lost in the frame, and prevents complete impulse transmission. Greater rigidity of the frame therefore brings about a better transition of the Impact energy on the tennis ball and reduce the energy loss to a minimum. Both weight loss and increase The rigidity of the racket can be reduced by using lighter and stiffer materials in racket production to reach.
- the extension of the racket is easier Construction of the tennis racket necessary to the moment of inertia conventional racket due to the parallel displacement of the To reach the center of gravity. It also increases the active one Range of the player, which means even with conventional Balls that are inaccessible can be hit safely can.
- the top heaviness of a racket results from the increased support weight of the head section compared to the handle section with the racket stored horizontally.
- By increasing the Top heaviness is the tennis racket according to the invention impact force transferred to the ball is greatly increased. Further will by this measure the rotational tearing of the racket Ball contacts outside the longitudinal axis of the racket and thus one harmful effects on the wrist, forearm and elbow avoided.
- the parameters are the repercussions when the Balles on the racket, on the arm and on the wrists Improved power while maintaining an exact ball direction specification reached.
- the weight reduction is thereby particularly advantageous produces that the frame material one of synthetic fiber and Resin is a composite material.
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Golf Clubs (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
Description
Die Erfindung bezieht sich auf Tennisschläger, insbesondere Tennisschläger, die leichter, steifer, kopflastiger und länger als herkömmliche Tennisschläger sind.The invention relates to tennis rackets, in particular Tennis rackets that are lighter, stiffer, top heavy and longer than conventional tennis rackets.
Die große Popularität von Tennis als Massensport hat ständig steigende Anforderungen sowohl an die Athletik und Technik des Spielers als auch an das Material zur Folge. Zur Erhöhung der Spielkultur sowohl von Freizeitsportlern bzw. Amateuren oder professionellen Spielern müssen daher insbesondere die Schläger immer weiter verbessert werden. Die Schlägereigenschaften, die maßgeblich die Handhabung des Schlägers, die präzise Richtungsgebung des Balles, die Umsetzung der Reaktionsschnelligkeit des Spielers auf den Ball über den Schläger, eine hohe Ballbeschleunigung und somit insgesamt eine angenehme Spielweise beeinflussen, sind das Schlägergewicht, der Schlägerschwerpunkt und der Aufschlagschwerpunkt (dynamische Schwerpunkt), gemessen vom Griffende, die Frequenz und die Schlägergesamtlänge. Die Kombination dieser Parameter, verbunden mit der richtigen Materialwahl, hat unmittelbar hohe Stabilität und Schlagpräzision bei gleichzeitiger Schonung der Gelenke, Bänder und Muskulatur des Spielers zur Folge. Herkömmliche bekannte Tennisschläger weisen ein Gewicht von rund 420 g, eine Schlägerlänge von rund 66 cm, einen Schwerpunkt von rund 33 cm und einen dynamischen Schwerpunkt von rund 42 cm vom Schlägerende entfernt auf. Der Schlägerwerkstoff bestand dabei aus Holz, mit welchem sich eine Schlägereigenfrequenz im ersten Mode bei frei-frei Aufhängung von ca. 90 Hz erzielen ließ.The huge popularity of tennis as a mass sport has been increasing all the time increasing demands on both the athletics and technique of Player as well as the material. To increase the Game culture both by recreational athletes or amateurs or professional players must therefore especially the racket can always be improved. The club properties that decisive is the handling of the racket, the precise direction of the ball, the implementation of the responsiveness of the Player hit the ball over the racket, high ball acceleration and thus influence a pleasant playing style overall, are the club weight, the club center of gravity and the Center of gravity (dynamic center of gravity), measured from Handle end, the frequency and racket length. The combination this parameter, combined with the right choice of material, has immediate high stability and impact precision simultaneous protection of the joints, ligaments and muscles of the Player. Conventional known tennis rackets have a weight of around 420 g, a club length of around 66 cm, a focus of around 33 cm and a dynamic focus about 42 cm from the end of the club. The racket material consisted of wood, with which one Club natural frequency in first mode with free-free suspension of about 90 Hz.
In der US-A-1 539 019 (Nikonow) wird ein Tennisschläger vorgestellt, der leichter, steifer und kopflastiger als herkömmliche Schläger ist. Solch ein Schläger wiegt ungefähr 340 g, sein Schwerpunkt befindet sich rund 41 cm, sein dynamischer Schwerpunkt rund 50 cm vom Griffende entfernt. Der Schläger zeichnet sich durch höhere Steifigkeit als herkömmliche Schläger aus. A tennis racket is presented in US-A-1 539 019 (Nikonow), the lighter, stiffer and more top-heavy than conventional ones Racket is. Such a racket weighs approximately 340 g The center of gravity is around 41 cm, its dynamic center of gravity about 50 cm from the end of the handle. The bat draws are more rigid than conventional rackets.
Der US-A-4 165 071 (Frolow) ist ebenfalls ein im Vergleich zu konventionellen Tennisschlägern leichterer, steiferer und kopflastigerer Tennisschläger zu entnehmen. Der Schläger besitzt ein Gewicht kleiner als 280 g, einen Abstand vom Schwerpunkt zum Griffende von mehr als 38 cm, einen dynamischen Schwerpunkt, der mehr als 50 cm vom Griffende entfernt ist und eine frei-frei Eigenfrequenz im ersten Mode größer als 155 Hz.US-A-4 165 071 (Frolow) is also one compared to conventional ones Tennis rackets lighter, stiffer and more top heavy Remove tennis racket. The racket has one Weight less than 280 g, a distance from the center of gravity to the Handle end of more than 38 cm, a dynamic focus, the is more than 50 cm from the end of the handle and a free-free Natural frequency in the first mode greater than 155 Hz.
Die US-A-5 368 295 (Severa) weist ebenfalls geringeres Gewicht, höhere Steifigkeit und Kopflastigkeit als herkömmliche Tennisschläger auf. Das Gewicht beträgt hierbei weniger als 270 g, der Schwerpunkt ist hierbei mehr als 39 cm und der dynamische Schwerpunkt mehr als 50 cm vom Griffende entfernt. Im ersten Mode erreicht der Schläger eine frei-frei Eigenfrequenz von 190 Hz.US-A-5 368 295 (Severa) is also lighter in weight, higher rigidity and top-heaviness than conventional tennis rackets on. The weight is less than 270 g The focus here is more than 39 cm and the dynamic Center of gravity more than 50 cm from the end of the handle. In the first In fashion, the racket reaches a free-free natural frequency of 190 Hz.
Die Erfindung zielt nun darauf ab, einen Tennisschläger der eingangs genannten Art zu schaffen, bei dem durch Gewichtsverringerung, Erhöhung der Steifigkeit, Kopflastigkeit und größerer Gesamtlänge die Schlagtechnik und Schlagkraft erhöht und somit die Qualität des Spieles bei höherem Komfort verbessert werden. Zur Lösung dieser Aufgabe besteht die Erfindung im wesentlichen darin, daß der Tennisschläger in Kombination ein bespanntes Gesamtgewicht von weniger als 245 g, eine Gesamtlänge größer als 70 cm, eine frei-frei Eigenfrequenz im ersten Mode von höher als 210 Hz, einen Schwerpunkt von mehr als 41 cm und einen dynamischen Schwerpunkt von mehr als 50 cm, gemessen vom Griffende, aufweist. Das geringere Gewicht des Schlägers hat unmittelbar bänder-, gelenk- und muskulaturschonende Wirkung, wodurch insbesondere die Ausbildung von Tennisarmen (Epicondylitis) verhindert wird. Die Verringerung des Schlägergewichtes bewirkt außerdem eine Verminderung der vorzeitigen Ermüdung des Spielers. Die Steifigkeit des Schlägers hat unmittelbare Auswirkungen auf die Dissipationsenergie, die im Rahmen verloren geht, und eine vollständige Impulsübertragung verhindert. Höhere Steifigkeit des Rahmens bewirkt demnach einen besseren Übergang der Schlagenergie auf den Tennisball und verringert die Verlustenergie auf ein Minimum. Sowohl Gewichtsreduktion als auch Erhöhung der Steifigkeit des Schlägers lassen sich durch die Verwendung leichterer und steiferer Materialien bei der Schlägerfertigung erreichen. Die Verlängerung des Schlägers ist bei leichterer Bauweise des Tennisschlägers vonnöten, um das Trägheitsmoment konventioneller Schläger durch die parallele Verlagerung der Schwerpunktdrehachse zu erreichen. Sie erhöht zudem die aktive Reichweite des Spielers, wodurch auch mit konventionellen Tennisschlägern nicht erreichbare Bälle sicher geschlagen werden können. Die Kopflastigkeit eines Schlägers ergibt sich aus dem erhöhten Auflagegewicht des Kopfteiles gegenüber dem Griffteil bei horizontaler Lagerung des Schlägers. Durch die Erhöhung der Kopflastigkeit wird bei dem erfindungsgemäßen Tennisschläger die auf den Ball übertragene Schlagkraft stark erhöht. Weiters wird durch diese Maßnahme das drehförmige Verreißen des Schlägers bei Ballkontakten außerhalb der Schlägerlängsachse und somit eine schädliche Rückwirkung auf Handgelenk, Unterarm und Ellbogen vermieden. In Kombination mit den anderen, gleichzeitig vorgegebenen Parametern werden so die Rückwirkungen beim Aufprall des Balles auf den Schläger, auf den Arm und die Handgelenke bei verbesserter Schlagkraft unter Beibehaltung einer exakten Ballrichtungsvorgabe erreicht. Mit Erfüllung der vorgenannten Parameter zur Ausführung eines Tennisschlägers der eingangs genannten Art ließen sich also überraschender Weise bei Verringerung des Schägergewichtes deutlich spürbare Verbesserungen sowohl in der Schlagtechnik als auch bei der Qualität des Spieles sowie dem Spielkomfort bei maximaler Schonung des Arm- und Schulterbereiches des Spielers erreichen. Die Einhaltung einer frei-frei Frequenz im ersten Mode von 210 Hz verleiht dem Schläger eine hohe Dynamik bei hoher Schlagpräzision und trägt weiters zur Armschonung bei.The invention is now aimed at a tennis racket at the beginning to create the type mentioned, by reducing weight, Increase in stiffness, top heaviness and greater Overall length the punch technique and punch power increased and thus the quality of the game can be improved with greater comfort. To achieve this object, the invention essentially consists in that the tennis racket is a stringed combination Total weight less than 245 g, a total length greater than 70 cm, a free-free natural frequency in the first mode of higher than 210 Hz, a center of gravity of more than 41 cm and a dynamic Center of gravity of more than 50 cm, measured from the end of the handle, having. The lower weight of the racket is immediate ligament, joint and muscle-protecting effect, which in particular prevents the formation of tennis arms (epicondylitis) becomes. The reduction in club weight causes also a reduction in the player's premature fatigue. The stiffness of the racket has an immediate impact on the dissipation energy that is lost in the frame, and prevents complete impulse transmission. Greater rigidity of the frame therefore brings about a better transition of the Impact energy on the tennis ball and reduce the energy loss to a minimum. Both weight loss and increase The rigidity of the racket can be reduced by using lighter and stiffer materials in racket production to reach. The extension of the racket is easier Construction of the tennis racket necessary to the moment of inertia conventional racket due to the parallel displacement of the To reach the center of gravity. It also increases the active one Range of the player, which means even with conventional Balls that are inaccessible can be hit safely can. The top heaviness of a racket results from the increased support weight of the head section compared to the handle section with the racket stored horizontally. By increasing the Top heaviness is the tennis racket according to the invention impact force transferred to the ball is greatly increased. Further will by this measure the rotational tearing of the racket Ball contacts outside the longitudinal axis of the racket and thus one harmful effects on the wrist, forearm and elbow avoided. In combination with the others, given at the same time The parameters are the repercussions when the Balles on the racket, on the arm and on the wrists Improved power while maintaining an exact ball direction specification reached. With fulfillment of the aforementioned parameters to execute a tennis racket of the aforementioned So sort of surprisingly, when reducing the racket weight clearly noticeable improvements both in the striking technique as well as the quality of the game as well the playing comfort with maximum protection of the arm and shoulder area of the player. Compliance with a free-free Frequency in the first mode of 210 Hz gives the racket high dynamics with high impact precision and also contributes to Comfort at.
In besonders vorteilhafter Weise wird die Gewichtsreduktion dadurch erzeugt, daß das Rahmenmaterial ein aus Kunstfaser und Kunstharz zusammengesetzter Werkstoff ist. The weight reduction is thereby particularly advantageous produces that the frame material one of synthetic fiber and Resin is a composite material.
Die Wahl kohlefaserverstärkter Kunststoffe mit Kunstharzverbingung macht es möglich, obengenannte Parameter zu erzielen und zudem Schmutz- und Wetterfestigkeit des Schlägers sicherzustellen.The choice of carbon fiber reinforced plastics with synthetic resin compound makes it possible to achieve the above parameters and also ensure that the racket is dirt and weatherproof.
Claims (2)
- A tennis racket including an impact surface and a handle and a dynamic centre of gravity of more than 50cm, measured from the handle end, characterized in that the tennis racket has in combination a strung overall weight of less than 245g, an overall length of more than 70cm, a free-free vibration frequency in the first mode of more than 210Hz, a centre of gravity of more than 41 cm, measured from the handle end.
- A tennis racket according to claim 1, characterized in that the frame material is a material composed of synthetic fibres and synthetic resin.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT453/95 | 1995-08-22 | ||
AT0045395U AT1069U1 (en) | 1995-08-22 | 1995-08-22 | TENNIS RACKET |
AT45395 | 1995-08-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0760245A1 EP0760245A1 (en) | 1997-03-05 |
EP0760245B1 true EP0760245B1 (en) | 2002-07-03 |
Family
ID=3491026
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96890135A Expired - Lifetime EP0760245B1 (en) | 1995-08-22 | 1996-08-21 | Tennis racket |
Country Status (5)
Country | Link |
---|---|
US (1) | US5893810A (en) |
EP (1) | EP0760245B1 (en) |
CN (1) | CN1108839C (en) |
AT (1) | AT1069U1 (en) |
DE (1) | DE59609394D1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6106417A (en) * | 1995-08-22 | 2000-08-22 | Head Sport Aktiengesellschaft | Lightweight tennis racket having high frequency |
GB2328379A (en) * | 1997-08-22 | 1999-02-24 | Dunlop Slazenger Group Ltd | Games racket |
ATE238827T1 (en) * | 1997-10-03 | 2003-05-15 | Head Sport Ag | BALL RACKET |
JP2005065842A (en) * | 2003-08-21 | 2005-03-17 | Sumitomo Rubber Ind Ltd | Racket frame |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1539019A (en) * | 1924-02-07 | 1925-05-26 | John P Nikonow | Tennis racket |
US3801099A (en) * | 1971-06-23 | 1974-04-02 | J Lair | Tennis racquet |
US4291574A (en) * | 1976-01-05 | 1981-09-29 | Frolow Jack L | Tennis racket |
USRE31419E (en) * | 1976-01-05 | 1983-10-18 | Tennis racket | |
USRE33372E (en) * | 1983-10-19 | 1990-10-09 | Tennis racket | |
USRE34067E (en) * | 1983-12-12 | 1992-09-15 | Ektelon | Racquetball racquet with increased hitting area improved racquetball racquet construction |
USRE34068E (en) * | 1983-12-12 | 1992-09-15 | Ektelon | Racquetball raquet with increased hitting area |
JPS63270068A (en) * | 1987-04-28 | 1988-11-08 | ヤマハ株式会社 | Racket frame |
GB2208356B (en) * | 1987-08-04 | 1991-08-07 | Wilson Sporting Goods | Tennis racket |
DE4021881A1 (en) * | 1989-07-11 | 1991-01-24 | Siegfried Kuebler | Sports racket for resilient balls - is tuned to resonant frequency between 400 and 100 Hz |
US5062634A (en) * | 1990-08-31 | 1991-11-05 | Wilson Sporting Goods Co. | Squash racket |
JP2648852B2 (en) * | 1991-10-07 | 1997-09-03 | 住友ゴム工業株式会社 | Tennis racket frame |
US5368295A (en) * | 1993-06-02 | 1994-11-29 | Wilson Sporting Goods Co. | Tennis racket |
-
1995
- 1995-08-22 AT AT0045395U patent/AT1069U1/en not_active IP Right Cessation
-
1996
- 1996-08-09 US US08/695,004 patent/US5893810A/en not_active Expired - Lifetime
- 1996-08-21 EP EP96890135A patent/EP0760245B1/en not_active Expired - Lifetime
- 1996-08-21 DE DE59609394T patent/DE59609394D1/en not_active Expired - Lifetime
- 1996-08-21 CN CN96112163A patent/CN1108839C/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
AT1069U1 (en) | 1996-10-25 |
US5893810A (en) | 1999-04-13 |
CN1108839C (en) | 2003-05-21 |
DE59609394D1 (en) | 2002-08-08 |
EP0760245A1 (en) | 1997-03-05 |
CN1148513A (en) | 1997-04-30 |
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