EP2164579B1 - Ball-striking implement - Google Patents

Ball-striking implement Download PDF

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Publication number
EP2164579B1
EP2164579B1 EP08763313A EP08763313A EP2164579B1 EP 2164579 B1 EP2164579 B1 EP 2164579B1 EP 08763313 A EP08763313 A EP 08763313A EP 08763313 A EP08763313 A EP 08763313A EP 2164579 B1 EP2164579 B1 EP 2164579B1
Authority
EP
European Patent Office
Prior art keywords
head frame
ball
string
impact surface
holding
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.)
Not-in-force
Application number
EP08763313A
Other languages
German (de)
French (fr)
Other versions
EP2164579A1 (en
Inventor
Hubert Nagler
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.)
TEC Sportmanagement AG
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TEC Sportmanagement AG
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Publication date
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Publication of EP2164579A1 publication Critical patent/EP2164579A1/en
Application granted granted Critical
Publication of EP2164579B1 publication Critical patent/EP2164579B1/en
Not-in-force 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
    • A63B49/10—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
    • 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
    • A63B49/028—Means for achieving greater mobility of the string bed
    • 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
    • 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
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/54—Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations

Definitions

  • the invention relates to a ball impact device, in particular tennis, squash or badminton rackets, according to the preamble of patent claim 1.
  • plastic ball impact devices have a head frame with a hollow profile, in which through holes are drilled. Through these holes, the continuous string is stretched crosswise in loops. It is known that the through holes on the one hand mechanically weaken the head frame and on the other hand scrub the string or string sections, whereby they can tear there under heavy load. Therefore, the through holes are provided with single eyelets or ⁇ senb species of a soft thermoplastic material.
  • the US 4,005,862 shows a ball impact device in which holding eyes are provided for attachment of string sections, which are arranged in a recess of the head frame.
  • racquets with a median strip of thermoplastic material whose hardness is less than or equal to the hardness of the string. Hollow sections of fiber-reinforced plastic are on both sides of the median strip formed. The through holes are drilled or prefabricated in the median strip, eg with channels produced or pressed by injection molding.
  • a tennis racket which is made by injection molding and has formed a wire with rectangular eyelets, in which the string is stretched crosswise.
  • the rectangular eyelets are arranged in the plane of the clubface. Since the head frame is pear-shaped and the rectangular eyelets are arranged with the upper edges approximately parallel to the inside of the head frame, the string is pulled when stringing either in the left or right corner of the respective eyelets. Therefore, it is difficult, if not impossible, to achieve a uniform covering of the tennis racket.
  • the respective string sections are not all in the same plane because they are pulled around the eyes and thus a string or striking surface which is exactly plane-parallel to the head frame, can hardly be reached.
  • the present invention is based on the object to improve a ball impact device of the aforementioned type so that a uniform covering of the head frame without weakening of the same is obtained, making it irrelevant whether the ball is hit in the middle or at the ends of the racket.
  • FIGS. 1 to 6 refer to an example which does not form part of the claimed invention.
  • FIG. 1 is purely schematic a section of a head frame 1 of a known tennis racket with four formed as loops holding elements 2 and each clamped in two adjacent eyelets strings 3 and 3 '.
  • the eyelets 2 are attached to the head frame 1, that the annular surface of the eyelets 2 is substantially perpendicular to the frame plane 4, in which the fabric of the tennis racket is.
  • FIG. 2 shows a cross section through the head frame 1 along the line AA in Fig. 1 ,
  • the head frame 1 is formed hollow with a on the inner side a circumferential annular sector-shaped flat groove 5, which has a perpendicular thereto introduced bore 6, which serves to receive an eyelet 2.
  • FIG. 3 shows the head frame 1 in the region of the so-called heart of the tennis racket, in which the two frame parts 7 have a smaller diameter and these frame parts 7 pinch an H-shaped middle part 8, which also has a similar annular sector-shaped shallow groove 5 'and a bore 6' to Pick up an eyelet 2.
  • FIG. 4 shows an oval eyelet 2A, FIG. 5 an elliptical eyelet 2B and FIG. 6 a circular eyelet 2C.
  • the shank 9 of these loops 2A to 2C is provided with a helical coil 10 and a front tip 11, respectively, for easier insertion into the bore 6.
  • FIG. 7 shows an inventive variant of a head frame 13, which is also hollow and has a circular sector-shaped shallow groove 14.
  • head frame holding elements are also provided here as arcuate Individual parts or bracket 15 are formed, which have a circular sector-shaped central part 16 and two curved legs 17, which corresponds to the curvature of the head frame 13 in the region of the upper inner and lower inner edge.
  • bracket 15 forms with the flat groove 14 an oval opening 18 through which the string 19 of the fabric is passed.
  • the brackets 15 are fully integrated in the head frame 13, which is produced by lamination with so-called prepregs or in an injection molding process.
  • FIG. 8 is now shown a frame section 20 of a conventional tennis racket, with a string covering provided in the head frame through holes (not shown). Characterized that the string 21 is fixed at its end 22 on the head frame 20, a ball striking the string will deflect the head frame, so that the ball does not jump perpendicular to the racket plane (resting state), but at an angle of about 80 °. A professional tennis player can compensate for such a deflection of the head frame 20 with the wrist. To accurately determine the direction of the ball and the speed of the ball, it takes daily practice and a good eye, which only tennis players in the upper class succeeds.
  • FIG. 9 Now, the head frame 1 of the tennis racket according to the present invention is shown, wherein the clamped end 25 of the string 26 in the bracket 15 makes a lateral movement, which is caused by the impact of the tennis ball.
  • the energy of the tennis ball is now absorbed by the fabric and no longer by a deflection of the head frame as in FIG. 8 ,
  • the entire string or string bed is thus deflected laterally, making a much more precise ball control is possible because the rebound direction is always perpendicular to the racket level and thus the direction of the ball can be controlled with a very small spread by the tennis player. It allows tennis players of every league without much effort an exact ball control.
  • Such a covering has the further advantage that the vibrations of the head frame are greatly reduced by the lateral deflection of the strings.
  • the head frame 1 or 13 of the tennis racket described here is produced by injection molding from a suitable fiber-reinforced plastic.
  • the brackets 15 are optionally made of fiber-reinforced plastic, metal such as titanium, steel, non-ferrous metal, light metal such as aluminum or their alloys, or made of a composite of these materials.
  • the head frame can also be designed aerodynamically cheaper.

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  • 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)

Description

Die Erfindung betrifft ein Ballschlaggerät, insbesondere Tennis-, Squash oder Badminton-Schläger, nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a ball impact device, in particular tennis, squash or badminton rackets, according to the preamble of patent claim 1.

Herkömmliche, aus Kunststoff bestehende Ballschlaggeräte weisen einen Kopfrahmen mit einem Hohlprofil auf, in welchen Durchgangslöcher gebohrt sind. Durch diese Durchganglöcher wird die durchgehende Saite kreuzweise in Schlaufen gespannt. Es ist bekannt, dass die Durchgangslöcher einerseits den Kopfrahmen mechanisch schwächen und andererseits die Saite oder Saitenabschnitte scheuern, wodurch diese bei grosser Belastung dort reissen können. Deshalb werden die Durchgangslöcher mit Einzelösen oder Ösenbändern aus einem weichen thermoplastischen Kunststoff versehen.Conventional, plastic ball impact devices have a head frame with a hollow profile, in which through holes are drilled. Through these holes, the continuous string is stretched crosswise in loops. It is known that the through holes on the one hand mechanically weaken the head frame and on the other hand scrub the string or string sections, whereby they can tear there under heavy load. Therefore, the through holes are provided with single eyelets or Ösenbändern of a soft thermoplastic material.

Aus der US 3,547,440 ist ein Ballschlaggerät bekannt, bei dem winkelige Halteelemente zur Befestigung von Saitenabschnitten an dem Kopfrahmen aus Metall vorgesehen sind, die an dem Kopfrahmen aufwendig festgelötet sind.From the US 3,547,440 a ball impact device is known in which angular holding elements are provided for attachment of string sections to the head frame made of metal, which are soldered to the head frame consuming.

Die US 4,005,862 zeigt ein Ballschlaggerät, bei welchem Halteösen zur Befestigung von Saitenabschnitten vorgesehen sind, die in einer Aussparung des Kopfrahmens angeordnet sind.The US 4,005,862 shows a ball impact device in which holding eyes are provided for attachment of string sections, which are arranged in a recess of the head frame.

Aus der US 3,664,669 ist außerdem ein Ballschlaggerät bekannt, bei dem im Wesentlichen V-förmige Halteelemente ebenfalls in einer Aussparung des Kopfrahmens zur Befestigung von Saitenabschnitten angeordnet sind. Dadurch wird wesentlicher Teil des Kopfrahmens mechanisch geschwächt.From the US 3,664,669 In addition, a ball impact device is known in which substantially V-shaped retaining elements are also arranged in a recess of the head frame for attachment of string sections. As a result, essential part of the head frame is mechanically weakened.

Bekannt sind auch Schläger mit einem Mittelstreifen aus thermoplastischem Kunststoff, dessen Härte kleiner oder gleich der Härte der Saite ist. An den Mittelstreifen sind beiderseits Hohlprofile aus faserverstärktem Kunststoff angeformt. Die Durchgangslöcher werden dabei in den Mittelstreifen gebohrt oder vorgefertigt, z.B. mit im Spritzgussverfahren gefertigten oder gepressten Kanälen.Also known are racquets with a median strip of thermoplastic material whose hardness is less than or equal to the hardness of the string. Hollow sections of fiber-reinforced plastic are on both sides of the median strip formed. The through holes are drilled or prefabricated in the median strip, eg with channels produced or pressed by injection molding.

Um diese Nachteile zu verhindern ist aus EP-A-0142286 ein Tennisschläger bekannt, der in einem Spritzgussverfahren hergestellt ist und einen Draht mit rechteckförmigen Ösen eingeformt hat, in welche die Saite kreuzweise gespannt ist. Die rechteckförmigen Ösen sind dabei in der Ebene der Schlagfläche angeordnet. Da der Kopfrahmen birnenförmig ausgebildet ist und die rechteckförmigen Ösen mit der oberen Kanten etwa parallel zur Innenseite des Kopfrahmens angeordnet sind, wird die Saite beim Bespannen entweder in die linke oder rechte Ecke der jeweiligen Ösen gezogen. Deswegen ist es schwierig, wenn nicht unmöglich, um eine gleichmässige Bespannung des Tennisschlägers zu erreichen. Ferner liegen die jeweiligen Saitenabschnitte dadurch nicht alle in derselben Ebene, da sie um die Ösen herum gezogen werden und somit eine Bespannung oder Schlagfläche, welche genau planparallel zum Kopfrahmen ist, kaum zu erreichen ist.To prevent these disadvantages is out EP-A-0142286 a tennis racket, which is made by injection molding and has formed a wire with rectangular eyelets, in which the string is stretched crosswise. The rectangular eyelets are arranged in the plane of the clubface. Since the head frame is pear-shaped and the rectangular eyelets are arranged with the upper edges approximately parallel to the inside of the head frame, the string is pulled when stringing either in the left or right corner of the respective eyelets. Therefore, it is difficult, if not impossible, to achieve a uniform covering of the tennis racket. Furthermore, the respective string sections are not all in the same plane because they are pulled around the eyes and thus a string or striking surface which is exactly plane-parallel to the head frame, can hardly be reached.

Der vorliegenden Erfindung liegt nun die Aufgabe zugrunde, ein Ballschlaggerät der vorgenannten Art so zu verbessern, dass eine gleichmässige Bespannung des Kopfrahmens ohne Schwächung desselben erhalten wird, wodurch es unerheblich ist, ob der Ball in der Mitte oder an den Enden des Schlägers getroffen wird.The present invention is based on the object to improve a ball impact device of the aforementioned type so that a uniform covering of the head frame without weakening of the same is obtained, making it irrelevant whether the ball is hit in the middle or at the ends of the racket.

Diese Aufgabe wird durch ein Ballschlaggerät mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a ball impact device with the features of claim 1.

Weitere Vorteile der Erfindung folgen aus den abhängigen Patentansprüchen und aus der nachfolgenden Beschreibung, in welcher die Erfindung anhand eines in den schematischen Zeichnungen dargestellten Ausführungsbeispieles näher erläutert wird. Es zeigt:

Fig. 1
einen Ausschnitt eines Kopfrahmens eines Tennisschlägers,
Fig. 2
einen Querschnitt durch den Kopfrahmen gemäss der Linie A-A in Fig. 1
Fig. 3
einen Querschnitt durch den Kopfrahmen im Bereich des sogenannten Herzstückes,
Fig. 4 bis 6
verschiedene Ausführungen der eingesetzten Ösen,
Fig. 7
eine perspektivische Darstellung eines Ausschnittes eines erfindungsgemäss ausgebildeten Kopfrahmens,
Fig. 8
eine schematische Darstellung eines herkömmlichen Tennisschlägers bei der Ballannahme, und Fig. 9 eine schematische Darstellung eines erfindungsgemässen Tennisschlägers bei der Ballannahme.
Further advantages of the invention will become apparent from the dependent claims and from the following description in which the invention with reference to an embodiment shown in the schematic drawings is explained in more detail. It shows:
Fig. 1
a section of a head frame of a tennis racket,
Fig. 2
a cross section through the head frame along the line AA in Fig. 1
Fig. 3
a cross section through the head frame in the region of the so-called heart,
4 to 6
different versions of the eyelets used,
Fig. 7
a perspective view of a section of an inventive trained head frame,
Fig. 8
a schematic representation of a conventional tennis racket in the ball acceptance, and Fig. 9 a schematic representation of an inventive tennis racket at the ball acceptance.

Die Figuren 1 bis 6 beziehen sich auf ein Beispiel, welches nicht Teil der beanspruchten Erfindung ist.The FIGS. 1 to 6 refer to an example which does not form part of the claimed invention.

In den Figuren sind für dieselben Elemente jeweils dieselben Bezugszeichen verwendet worden und erstmalige Erklärungen betreffen alle Figuren, wenn nicht ausdrücklich anders erwähnt.In the figures, the same reference numerals have been used for the same elements and first explanations apply to all figures, unless expressly stated otherwise.

In der Figur 1 ist rein schematisch einen Ausschnitt eines Kopfrahmens 1 eines an sich bekannten Tennisschlägers mit vier als Ösen ausgebildeten Halteelementen 2 und jeweils in zwei benachbarten Ösen eingespannte Saiten 3 und 3'. Wie ersichtlich sind die Ösen 2 so am Kopfrahmen 1 befestigt, dass die Ringfläche der Ösen 2 im wesentlichen senkrecht zur Rahmenebene 4, in welchem die Bespannung des Tennisschlägers liegt.In the FIG. 1 is purely schematic a section of a head frame 1 of a known tennis racket with four formed as loops holding elements 2 and each clamped in two adjacent eyelets strings 3 and 3 '. As can be seen, the eyelets 2 are attached to the head frame 1, that the annular surface of the eyelets 2 is substantially perpendicular to the frame plane 4, in which the fabric of the tennis racket is.

Figur 2 zeigt einen Querschnitt durch den Kopfrahmen 1 gemäss der Linie A-A in Fig. 1. Wie deutlich erkennbar ist der Kopfrahmen 1 hohl ausgebildet mit einer auf der innenliegenden Seite eine umlaufende ringsektorförmige flache Nut 5, welche eine senkrecht dazu eingebrachte Bohrung 6 aufweist, welche zur Aufnahme einer Öse 2 dient. FIG. 2 shows a cross section through the head frame 1 along the line AA in Fig. 1 , As can be clearly seen, the head frame 1 is formed hollow with a on the inner side a circumferential annular sector-shaped flat groove 5, which has a perpendicular thereto introduced bore 6, which serves to receive an eyelet 2.

Figur 3 zeigt den Kopfrahmen 1 im Bereich des sogenannten Herzstückes des Tennisschlägers, bei welchem die beiden Rahmenteile 7 einen geringeren Durchmesser aufweisen und diese Rahmenteile 7 ein H-förmiges Mittelteil 8 einklemmen, welches ebenfalls eine ähnliche ringsektorförmige flache Nut 5' und eine Bohrung 6' aufweist zur Aufnahme einer Öse 2. FIG. 3 shows the head frame 1 in the region of the so-called heart of the tennis racket, in which the two frame parts 7 have a smaller diameter and these frame parts 7 pinch an H-shaped middle part 8, which also has a similar annular sector-shaped shallow groove 5 'and a bore 6' to Pick up an eyelet 2.

Figur 4 zeigt eine ovalförmige Öse 2A, Figur 5 eine elliptische Öse 2B und Figur 6 eine kreisrunde Öse 2C. Der Schaft 9 dieser Ösen 2A bis 2C ist jeweils mit einer Schraubenwindung 10 und einer vorderen Spitze 11 versehen, um einfacher in die Bohrung 6 eingeführt zu werden. FIG. 4 shows an oval eyelet 2A, FIG. 5 an elliptical eyelet 2B and FIG. 6 a circular eyelet 2C. The shank 9 of these loops 2A to 2C is provided with a helical coil 10 and a front tip 11, respectively, for easier insertion into the bore 6.

Figur 7 zeigt eine erfindungsgemässe Variante eines Kopfrahmens 13, der ebenfalls hohl ausgebildet ist und eine kreissektorförmige flache Nut 14 aufweist. In diesen Kopfrahmen sind ebenfalls Halteelemente vorgesehen, hier als bogenförmige Einzelteile oder Bügel 15 ausgebildet, welche einen kreissektorförmigen Mittelteil 16 und zwei gekrümmte Beine 17 aufweisen, welche der Krümmung des Kopfrahmens 13 im Bereich des oberen inneren und unteren inneren Randes entspricht. Somit bildet der Bügel 15 mit der flachen Nut 14 eine ovale Öffnung 18, durch welche die Saite 19 der Bespannung hindurchgeführt ist. Die Bügel 15 sind voll integriert im Kopfrahmen 13, welcher durch Laminieren mit sogenannten Prepregs oder in einem Spritzgussverfahren hergestellt ist. FIG. 7 shows an inventive variant of a head frame 13, which is also hollow and has a circular sector-shaped shallow groove 14. In this head frame holding elements are also provided here as arcuate Individual parts or bracket 15 are formed, which have a circular sector-shaped central part 16 and two curved legs 17, which corresponds to the curvature of the head frame 13 in the region of the upper inner and lower inner edge. Thus, the bracket 15 forms with the flat groove 14 an oval opening 18 through which the string 19 of the fabric is passed. The brackets 15 are fully integrated in the head frame 13, which is produced by lamination with so-called prepregs or in an injection molding process.

In Figur 8 ist nun einen Rahmenausschnitt 20 eines herkömmlichen Tennisschlägers dargestellt, mit einer Saitenbespannung durch in den Kopfrahmen vorgesehenen Durchbohrungen (nicht ersichtlich). Dadurch dass die Saite 21 an ihrem Ende 22 am Kopfrahmen 20 fixiert ist, wird ein auf die Bespannung treffender Ball den Kopfrahmen auslenken, so dass der Ball nicht senkrecht zur Schlägerebene (Ruhezustand) abspringt, sondern in einem Winkel von etwa 80°. Ein professioneller Tennisspieler kann eine solche Auslenkung des Kopfrahmens 20 mit dem Handgelenk kompensieren. Um die Ballrichtung und die Ballgeschwindigkeit genau zu bestimmen, braucht es tagtägliche Übung und ein gutes Augenmass, was nur Tennisspieler in der oberen Klasse gelingt.In FIG. 8 is now shown a frame section 20 of a conventional tennis racket, with a string covering provided in the head frame through holes (not shown). Characterized that the string 21 is fixed at its end 22 on the head frame 20, a ball striking the string will deflect the head frame, so that the ball does not jump perpendicular to the racket plane (resting state), but at an angle of about 80 °. A professional tennis player can compensate for such a deflection of the head frame 20 with the wrist. To accurately determine the direction of the ball and the speed of the ball, it takes daily practice and a good eye, which only tennis players in the upper class succeeds.

In Figur 9 ist nun der Kopfrahmen 1 des Tennisschlägers gemäss der vorliegenden Erfindung dargestellt, wobei das eingespannte Ende 25 der Saite 26 im Bügel 15 eine seitliche Bewegung macht, welche durch den Aufprall des Tennisballs verursacht wird. Dadurch wird die Energie des Tennisballs nunmehr von der Bespannung aufgefangen und nicht mehr durch eine Auslenkung des Kopfrahmens wie in Figur 8. Die ganze Bespannung oder Saitenbett wird somit seitlich ausgelenkt, wodurch eine viel präzisere Ballkontrolle möglich ist, da die Abprallrichtung stets senkrecht zur Schlägerebene ist und somit die Richtung des Balles mit einer ganz geringen Streubreite vom Tennisspieler beherrscht werden kann. Es ermöglicht Tennisspieler von jeder Spielklasse ohne grossen Kraftaufwand eine exakte Ballführung. Eine solche Bespannung hat den weiteren Vorteil, dass durch die seitliche Auslenkung der Saiten die Vibrationen des Kopfrahmens stark reduziert werden.In FIG. 9 Now, the head frame 1 of the tennis racket according to the present invention is shown, wherein the clamped end 25 of the string 26 in the bracket 15 makes a lateral movement, which is caused by the impact of the tennis ball. As a result, the energy of the tennis ball is now absorbed by the fabric and no longer by a deflection of the head frame as in FIG. 8 , The entire string or string bed is thus deflected laterally, making a much more precise ball control is possible because the rebound direction is always perpendicular to the racket level and thus the direction of the ball can be controlled with a very small spread by the tennis player. It allows tennis players of every league without much effort an exact ball control. Such a covering has the further advantage that the vibrations of the head frame are greatly reduced by the lateral deflection of the strings.

Der Kopfrahmen 1 bzw. 13 des hier beschriebenen Tennisschlägers ist im Spritzguss aus einem geeigneten faserverstärkten Kunststoff hergestellt. Die Bügel 15 sind wahlweise aus faserverstärktem Kunststoff, Metall wie beispielsweise Titan, Stahl, Buntmetall, Leichtmetall wie Aluminium oder deren Legierungen, oder aus einem Verbund dieser Materialien hergestellt. Dadurch kann der Kopfrahmen auch aerodynamisch günstiger gestaltet sein.The head frame 1 or 13 of the tennis racket described here is produced by injection molding from a suitable fiber-reinforced plastic. The brackets 15 are optionally made of fiber-reinforced plastic, metal such as titanium, steel, non-ferrous metal, light metal such as aluminum or their alloys, or made of a composite of these materials. As a result, the head frame can also be designed aerodynamically cheaper.

Claims (2)

  1. Ball-striking implement, especially a tennis, squash or badminton racket, having a head frame (1; 13) which comprises an impact surface and which is of hollow construction and made of a fibre-reinforced plastics material, and having, formed thereon, a stem with a handle, the impact surface being defined by at least one string (3; 19) which is stretched crosswise and which forms string portions fastened to the head frame substantially parallel to one another, characterised in that holding elements (15) are so embedded and fully integrated, as individual arcuate parts in the form of arcuate holding bows, in the head frame, which is manufactured by laminating with so-called prepregs or in an injection-moulding process, that the arched surface is substantially perpendicular to the impact surface, the holding bows each having a central part (16) in the shape of a sector of a circle and two curved legs (17), corresponding to the curvature of the head frame (13) in the region of the upper inner and lower inner edge, so that the string portions are located in a single plane forming the impact surface and the ends (26) of the string portions which are tautly secured in the holding bows (15) are laterally deflectable when struck by a tennis ball.
  2. Ball-striking implement according to claim 1, characterised in that the head frame (13) has an inner oval-shaped groove (14) which forms, together with the arcuate holding element (15), an oval opening for receiving the string (19) of the stringing.
EP08763313A 2007-07-04 2008-06-12 Ball-striking implement Not-in-force EP2164579B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH10752007 2007-07-04
PCT/IB2008/052325 WO2009004514A1 (en) 2007-07-04 2008-06-12 Ball-striking implement

Publications (2)

Publication Number Publication Date
EP2164579A1 EP2164579A1 (en) 2010-03-24
EP2164579B1 true EP2164579B1 (en) 2013-01-16

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EP08763313A Not-in-force EP2164579B1 (en) 2007-07-04 2008-06-12 Ball-striking implement

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US (2) US8333672B2 (en)
EP (1) EP2164579B1 (en)
CN (1) CN101687109B (en)
WO (1) WO2009004514A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014110656A1 (en) 2014-07-29 2016-02-04 Tec Sportmanagement Ag Ball impact device and method for its production

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8333672B2 (en) * 2007-07-04 2012-12-18 Tec Sportmanagement Ag Ball-striking implement
CN102688586A (en) * 2011-03-25 2012-09-26 梅显道 Novel badminton racket
CN112386888B (en) * 2020-10-26 2022-01-18 富阳双龙防火门有限公司 Tennis racket with adjustable string tightness

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US6062994A (en) * 1998-04-10 2000-05-16 Ef Composite Technologies, L.P. Reinforced racquet with flat string bed
US6916035B2 (en) * 2001-01-23 2005-07-12 Russell A. Houser Athletic devices and other devices with superelastic components
US6440015B1 (en) * 2001-08-16 2002-08-27 Chen-Chung Chang String fastener for a racket
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US7371197B1 (en) * 2007-05-25 2008-05-13 Yuan Min An Enterprise Co., Ltd. Safety racket
US8333672B2 (en) * 2007-07-04 2012-12-18 Tec Sportmanagement Ag Ball-striking implement
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Publication number Priority date Publication date Assignee Title
DE102014110656A1 (en) 2014-07-29 2016-02-04 Tec Sportmanagement Ag Ball impact device and method for its production

Also Published As

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US20120322590A1 (en) 2012-12-20
WO2009004514A1 (en) 2009-01-08
US8333672B2 (en) 2012-12-18
EP2164579A1 (en) 2010-03-24
CN101687109A (en) 2010-03-31
US20100190591A1 (en) 2010-07-29
US8574103B2 (en) 2013-11-05
CN101687109B (en) 2012-09-19

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