EP0495387B1 - Strings tensionable racket for ball games, in particular tennis, squash or the same - Google Patents

Strings tensionable racket for ball games, in particular tennis, squash or the same Download PDF

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Publication number
EP0495387B1
EP0495387B1 EP92100225A EP92100225A EP0495387B1 EP 0495387 B1 EP0495387 B1 EP 0495387B1 EP 92100225 A EP92100225 A EP 92100225A EP 92100225 A EP92100225 A EP 92100225A EP 0495387 B1 EP0495387 B1 EP 0495387B1
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EP
European Patent Office
Prior art keywords
racquet
facing
recess
head
longitudinal axis
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP92100225A
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German (de)
French (fr)
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EP0495387A1 (en
Inventor
Peter Suchy
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HAFNER, DIETER, DR.
STIPPL, HUBERT
Suchy Peter
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STIPPL HUBERT
Suchy Peter
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Publication of EP0495387A1 publication Critical patent/EP0495387A1/en
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • 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
    • 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
    • A63B49/03—Frames characterised by throat sections, i.e. sections or elements between the head and the shaft
    • A63B2049/0325—Frames characterised by throat sections, i.e. sections or elements between the head and the shaft with two legs having mutually different constructions
    • 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
    • A63B60/48—Details or accessories of golf clubs, bats, rackets or the like with corrugated cross-section

Definitions

  • the invention relates to a stringable racket for playing balls. This particularly addresses the area of tennis racquets, badminton racquets, squash racquets or other racquets which have a handle which is connected via a central region to a hoop-like racquet head into which the strings forming the playing surface can be retracted.
  • the middle region of the racket is formed by two frame branches enclosing an approximately triangular recess.
  • the two frame branches run together at the handle-stringed end and merge into the handle.
  • the lines of the two frame branches flow continuously into the ripe head.
  • the ripe-like club head can be oval, elliptical or a circular shape, in the prior art a wide variety of shapes of the rip-like club head are known.
  • Such phenomena can intensify if the ball is hit outside the so-called “sweet spot”, ie not with the optimal area of the striking surface, but also when the ball is hit in the "sweet spot” area, vibration energy passed through the bat into the player's hand and is therefore no longer available as energy for the ball to be played back.
  • a racket is known from EP-A-0 074 339 A1, in which the grip merges into the frame of the racket head via a main shaft and a secondary shaft. Between the main shaft and the secondary shaft there is a recess which is asymmetrical in relation to the longitudinal axis of the racket. The club head is inclined to the main axis of the club.
  • a tennis racket is also known, in which two frame branches of different lengths are provided for vibration damping and for asymmetrical enlargement of the sweet spot such that the longest long side is laterally offset from the longitudinal axis of the shaft.
  • a tennis racket is known from WO-A-9 014 870, in which the center of gravity of the racket is offset with respect to the extended grip axis in order to bring about a higher rotational stability.
  • the recess between the two frame branches, which are arranged between the club head and the grip area is asymmetrical.
  • a symmetrical racket is known in which the handle merges into the head by means of two separate frame branches.
  • Each of the frame branches has a thickening projecting into the recess.
  • the invention has for its object to improve a racket with the features of the preamble of claim 1 with regard to its vibration and resonance properties.
  • This object is achieved according to the characterizing part of the claim once in that the essentially triangular shaped recess between the two frame branches is asymmetrical in relation to the central longitudinal axis of the racket running through the handle and the club head. Defacto this means that the two frame branches mentioned differ in their shape. For example, one frame branch may be thicker than the other or else longer than the other frame branch. However, it is also possible to form bulges or thickenings, which are provided in the frame branches and protrude into the receptacle, at different locations to different degrees.
  • Purpose and goal of these consciously brought about Asymmetry is to at least partially compensate for vibrations running from the club head to the handle, which must pass through the center area of the racket, i.e. the two frame branches, in the area of the frame branches, that is to say, to shift their running times so that they no longer overlap in the handle area and can even reinforce, but at least partially compensate, ie cancel.
  • the 3 corners of the recesses should be rounded with three different rounded corners.
  • This measure also contributes to making the center area of the racket largely resonance-dead, so that the center area offers a vibration separation between the club head and handle, although it has the necessary strength and stability that is necessary for a sensitive game. Further advantageous features relating to the central area result from subclaims 3-5. Measurements on a racquet prototype have shown that the measures mentioned actually lead to a resonance optimization of the racquet.
  • the racket generally designated 1, consists of a handle 2, a hoop-like racket head 3, in which the strings 5 forming the playing surface 4 can be drawn in crosswise and a central region 6, which is formed by two frame branches 7, 8 which enclose an approximately triangular recess 9 between them.
  • the recess 9 is asymmetrical in relation to the central longitudinal axis 10 of the racket 2, which extends centrally through the handle 2 and the racket head 3.
  • Each of the two frame branches 7 and 8 has a thickening 11, 12 projecting into the recess 9, the thickening 11 of the first frame branch 7 being arranged in the region of the recess 9 facing the handle 2, while the thickening 12 is located in the Area of the recess 9 facing the club head 3.
  • the three corners of the recess are rounded off with three different corner curves 13, 14, 15, the center of the lower corner curve 13 facing the handle 2 being at a lateral distance from the central longitudinal axis 10.
  • the centers of the rounded corners 14 and 15 facing the club head 3 are at different distances from the club 1 from the central longitudinal axis.
  • the inner edge 16 of the first frame branch 7 facing the recess 9 is shorter than the inner edge 17 of the second frame branch 8 facing the recess 9, which is due to the fact that the corner rounding 15 is moved further into the club head area than the corner rounding 14 on the other side .
  • the string-covered playing surface 4 of the club head 3 is spanned by two circles 18, 19 with different radii, the two circles in the side area of the club head being merged into one another by a transition.
  • the radii of the two circles 18, 19 behave approximately as 0.94 to 0.83, which essentially corresponds to the vibration relationships between the fourth and fifth.
  • the center 20 of the larger circle 18 is arranged at the intersection of the smaller circle 19 with the central longitudinal axis 10.
  • the corner rounding 14 facing the club head 3 behaves like 1.111 to 0.9375
  • the distances projected onto the central longitudinal axis 10 between the center 21 of the handle and the corner rounding 13 relate to the distances projected onto the longitudinal axis between the corner rounding 13 and the corner rounding 15 like 1.111 to 1.0.
  • the rip-like racket head 2 shown there has in its cross section two mutually adjacent tubular recesses 22, 23, with each tube cross section being essentially spiral, which is done in that the inner surface 25 facing the string bore 24 of the tubular recesses 22, 23 are formed with a larger radius, which is on the frame side facing the playing surface at points 26 merges into a smaller radius that defines the inner surfaces of the tubular recesses 22, 23 on the outside of the frame.
  • the radius transitions of the helical pipe cross-sections merge into one another, each with a convex rounded portion 27, which are opposite each other on both sides of the side bore 24.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Pulmonology (AREA)
  • Golf Clubs (AREA)
  • Cosmetics (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Physical Vapour Deposition (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a racket which can be strung for ball games, in particular tennis, badminton, squash rackets or the like, having a handle, a hoop-type racket head, in which the strings forming the playing surface can be incorporated, and a central region which connects the handle and the racket head and is formed by two frame branches enclosing an approximately triangular cutout, the cutout 9 being of asymmetrical construction relative to the longitudinal mid-axis 10 of the racket 1 running centrally through the handle 2 and the racket head 3. <IMAGE>

Description

Die Erfindung betrifft einen saitenbespannbaren Schläger zum Spielen von Bällen. Angesprochen ist damit insbesondere der Bereich der Tennisschläger, Badmintonschläger, Sqashschläger oder sonstiger Schläger, die einen Handgriff aufweisen, der über einen Mittelbereich mit einem reifartigen Schlägerkopf verbunden ist, in den die die Spielfläche bildenden Saiten einziehbar sind.The invention relates to a stringable racket for playing balls. This particularly addresses the area of tennis racquets, badminton racquets, squash racquets or other racquets which have a handle which is connected via a central region to a hoop-like racquet head into which the strings forming the playing surface can be retracted.

Der Mittelbereich des Schlägers wird bei herkömmlichen Schlägern durch zwei eine etwa dreieckige Ausnehmung einschließende Rahmenzweige gebildet. Die beiden Rahmenzweige verlaufen am handgriffsaitigen Ende zusammen und gehen in den Handgriff über. An dem schlägerkopfsaitigen Ende fließen die Linien der beiden Rahmenzweige kontinuierlich in den reifartigen Schlägerkopf ein. Der reifartige Schlägerkopf kann oval, elyptisch oder einer Kreisform angenähert sein, im Stand der Technik sind unterschiedlichste Ausformungen des reifartigen Schlägerkopfes bekannt.In the case of conventional rackets, the middle region of the racket is formed by two frame branches enclosing an approximately triangular recess. The two frame branches run together at the handle-stringed end and merge into the handle. At the end of the racket head, the lines of the two frame branches flow continuously into the ripe head. The ripe-like club head can be oval, elliptical or a circular shape, in the prior art a wide variety of shapes of the rip-like club head are known.

Tennisschläger der neuesten Generation bestehen fast ausschließlich aus Kunststoffmaterialien. Durch Einbindung von Graphit-, Kevlar- oder Boronfasern errreicht man mit Schlägern relativ schlanker Ausbildung sehr hohe Festigkeiten bei relativ geringem Gewicht. Allerdings neigen derartige Schläger dazu, die beim Schlagen eines Balles auftretenden Vibrationen und Schwingungen nahezu ungedämpft in den Griff hineinzuübertragen. Dies führt zum einen dazu, daß die gesamte zur Verfügung stehende Energie nicht in den zurückzuspielenden Ball gebracht werden kann, sondern teilweise als nutzlose Schwingungsenergie in den Körper des Spielers geht. Zum anderen fühlt sich ein derart "resonierender" Schläger beim Schlag unangenehm an, was letztlich auch zu Ermüdungserscheinungen des Spielers führen kann. Derartige Phänomene können sich verstärken, wenn der Ball außerhalb des sog. "sweet spot", d.h. nicht mit dem optimalen Bereich der Schlagfläche getroffen wird, aber auch bei Schlägen, bei denen der Ball im "sweet spot"-Bereich getroffen wird, wird Schwingungsenergie durch den Schläger in die Hand des Spielers geleitet und steht damit nicht mehr als Energie für den zurückzuspielenden Ball zur Verfügung.The latest generation of tennis rackets are made almost entirely of plastic materials. By incorporating graphite, Kevlar or Boron fibers, clubs with a relatively slim design achieve very high strengths with a relatively low weight. However, rackets of this type tend to transmit the vibrations and vibrations which occur when hitting a ball into the handle almost undamped. On the one hand, this leads to the fact that the entire available Energy cannot be brought into the ball to be played back, but partly goes into the player's body as useless vibration energy. On the other hand, such a "resonating" racket feels uncomfortable when struck, which can ultimately also lead to fatigue of the player. Such phenomena can intensify if the ball is hit outside the so-called "sweet spot", ie not with the optimal area of the striking surface, but also when the ball is hit in the "sweet spot" area, vibration energy passed through the bat into the player's hand and is therefore no longer available as energy for the ball to be played back.

Aus EP-A-0 074 339 A1 ist ein Schläger bekannt, bei welchem der Griff über einen Hauptschaft und einen Nebenschaft in den Rahmen des Schlägerkopfes übergeht. Zwischen dem Hauptschaft und dem Nebenschaft ist eine Ausnehmung angeordnet, die bezogen auf die Längsachse des Schlägers asymmetrisch ausgebildet ist. Der Schlägerkopf ist gegenüber der Hauptachse des Schlägers geneigt.A racket is known from EP-A-0 074 339 A1, in which the grip merges into the frame of the racket head via a main shaft and a secondary shaft. Between the main shaft and the secondary shaft there is a recess which is asymmetrical in relation to the longitudinal axis of the racket. The club head is inclined to the main axis of the club.

Aus WO-A-8 902 296 ist ebenfalls ein Tennisschläger bekannt, bei welchem zur Vibrationsdämpfung und zur asymmetrischen Vergrößerung des sweet spots zwei Rahmenäste unterschiedlicher Länge vorgesehen sind derart, daß die längste Längsseite seitlich versetzt zur geometischen Schaftlängsachse angeordnet ist.From WO-A-8 902 296 a tennis racket is also known, in which two frame branches of different lengths are provided for vibration damping and for asymmetrical enlargement of the sweet spot such that the longest long side is laterally offset from the longitudinal axis of the shaft.

Aus WO-A-9 014 870 ist ein Tennisschläger bekannt, bei dem zur Herbeiführung einer höheren Drehstabilität der Schlägerkopfschwerpunkt bezogen auf die verlängerte Griffachse versetzt angeordnet ist. Dadurch ist die Ausnehmung zwischen den beiden Rahmenästen, die zwischen Schlägerkopf und Griffbereich angeordnet sind, unsymmetrisch.A tennis racket is known from WO-A-9 014 870, in which the center of gravity of the racket is offset with respect to the extended grip axis in order to bring about a higher rotational stability. As a result, the recess between the two frame branches, which are arranged between the club head and the grip area, is asymmetrical.

Aus GB-PS 1 322 606 ist ein symmetrischer Schläger bekannt, bei dem der Griff mittels zweier gesonderter Rahmenäste in den Kopf übergeht. Jeder der Rahmenäste weist eine in die Ausnehmung hineinstehende Verdickung auf.From GB-PS 1 322 606 a symmetrical racket is known in which the handle merges into the head by means of two separate frame branches. Each of the frame branches has a thickening projecting into the recess.

Der Erfindung liegt die Aufgabe zugrunde, einen Schläger mit den Merkmalen des Oberbegriffes des Anspruches 1 bezüglich seiner Schwingungs- und Resonanzeigenschaften zu verbessern. Diese Aufgabe wird nach dem Kennzeichen des Anspruches einst dadurch gelöst, daß die zwischen den beiden Rahmenzweigen im wesentlichen dreieckig geformte Ausnehmung bezogen auf die durch den Griff und den Schlägerkopf mittig verlaufende Mittellängsachse des Schlägers unsymetrisch ausgebildet ist. Defacto bedeutet dies, daß sich die beiden angesprochenen Rahmenzweige in ihrer Formgebung unterscheiden. Beispielsweise kann der eine Rahmenzweig dicker sein als der andere oder aber auch länger als der andere Rahmenzweig ausgebildet sein. Es ist aber auch möglich, Ausbauchungen oder Verdickungen, die in den Rahmenzweigen vorgesehen sind und in die Aufnehmung hineinstehen, an unterschiedlichen Stellen unterschiedlich stark auszubilden. Zweck und Ziel dieser bewußt herbeigeführten Asymetrie ist es, vom Schlägerkopf zum Griff laufende Schwingungen, die den Mittelbereich des Schlägers, d.h. die beiden Rahmenzweige durchlaufen müssen, im Bereich der Rahmenzweige zumindenst teilweise zu kompensieren, d.h. bezüglich ihrer Laufzeiten so zu verschieben, daß sie sich im Griffbereich nicht mehr überlagern und damit sogar verstärken können, sondern zumindest teilweise kompensieren, d.h. aufheben.The invention has for its object to improve a racket with the features of the preamble of claim 1 with regard to its vibration and resonance properties. This object is achieved according to the characterizing part of the claim once in that the essentially triangular shaped recess between the two frame branches is asymmetrical in relation to the central longitudinal axis of the racket running through the handle and the club head. Defacto this means that the two frame branches mentioned differ in their shape. For example, one frame branch may be thicker than the other or else longer than the other frame branch. However, it is also possible to form bulges or thickenings, which are provided in the frame branches and protrude into the receptacle, at different locations to different degrees. Purpose and goal of these consciously brought about Asymmetry is to at least partially compensate for vibrations running from the club head to the handle, which must pass through the center area of the racket, i.e. the two frame branches, in the area of the frame branches, that is to say, to shift their running times so that they no longer overlap in the handle area and can even reinforce, but at least partially compensate, ie cancel.

Gemäß Anspruch 2 sollen die 3 Ecken der Ausnehmungen mit drei unterschiedlichen Eckenrundungen ausgerundet sein. Auch diese Maßnahme trägt dazu bei, den Mittelbereich des Schlägers weitgehend resonanztot auszubilden, so daß der Mittelbereich gleichsam eine Schwingungstrennung zwischen Schlägerkopf und Griff bietet, obwohl er die notwendige Festigkeit und Stabilität aufweist, die zu einem gefühlvollen Spiel notwendig ist. Weitere vorteilhafte Merkmale betreffend den Mittelbereich ergeben sich aus den Unteransprüchen 3-5. Messungen an einem Schlägerprototyp haben ergeben, daß die angesprochenen Maßnahmen tatsächlich zu einer Resonanzoptimierung des Schlägers führen.According to claim 2, the 3 corners of the recesses should be rounded with three different rounded corners. This measure also contributes to making the center area of the racket largely resonance-dead, so that the center area offers a vibration separation between the club head and handle, although it has the necessary strength and stability that is necessary for a sensitive game. Further advantageous features relating to the central area result from subclaims 3-5. Measurements on a racquet prototype have shown that the measures mentioned actually lead to a resonance optimization of the racquet.

Wird der Schlägerkopf nach den Merkmalen der Ansprüche 6-8 ausgebildet, so ergeben sich gerade im Zusammenhang mit den Merkmalen der vorstehenden Ansprüche weitere Verbesserungen betreffend die Resonanzeigenschaften. Werden bei dem gesamten Schläger die Verhältnisse gewählt, wie es in den Ansprüchen 9, 10, und 11 gelehrt wird, so erhält man einen Schläger, der einem tatsächlich das Gefühl verleiht, man treffe den Ball bei jedem Schlag nahezu optimal und könne dem Ball einen optimierten Rückflügimpuls mitgeben.If the club head is designed according to the features of claims 6-8, further improvements regarding the resonance properties result precisely in connection with the features of the preceding claims. If the ratios are selected for the entire racket, as taught in claims 9, 10 and 11, a racket is obtained which actually gives the feeling that the ball is hit almost optimally with each stroke and one can hit the ball give the optimized return flight impulse.

Werden beim gesamten Schläger parallel verlaufende Rahmenflächen vermieden, so wird sich dies ebenfalls resonanzmindernd auf den gesamten Schlägerrahmen aus. Rahmeninterne Schwingungsreflektionen können so vermieden werden, der Schläger spielt sich insgesamt ruhiger und angenehmer. Ansprüche 12-14 befassen sich mit einer besonders resonanzoptimierten Querschnittsausbildung des reifartigen Schlägerkopfes, wobei hervorzuheben ist, daß entsprechende Bereiche bei Schlägern nach dem Stand der Technik die beiden nebeneinanderliegenden rohrförmigen Ausnehmungen nicht aufweisen, sondern lediglich nur eine rohrförmige Ausnehmung haben, die von den in den Schlägerkopf eingezogenen Saiten durchsetzt wird. Vorteilhaft für die resonanzoptimierten Eigenschaften des Schlägers ist es, wenn die Saiten zwischen den beiden rohrförmigen Ausnehmungen in gesonderten Bohrungen, die das Schlägerkopfmaterial durchsetzen, unmittelbar und ohne Zwischenschaltung von Hülsen oder Leisten eingezogen sind.If frame surfaces running parallel to the entire racket are avoided, this will also reduce the resonance of the entire racket frame. Vibration reflections within the frame can thus be avoided, the racket plays overall more calmly and comfortably. Claims 12-14 deal with a particularly resonance-optimized cross-sectional configuration of the rip-like racket head, it being emphasized that corresponding areas in rackets according to the prior art do not have the two adjacent tubular recesses, but only have one tubular recess which differs from that in the Strings struck through racket head. It is advantageous for the resonance-optimized properties of the racket if the strings are drawn in directly between the two tubular recesses in separate bores which penetrate the racket head material and without the interposition of sleeves or strips.

Die Erfindung ist anhand eines Ausführungsbeispieles in den Zeichnungsfiguren näher erläutert. Diese zeigen:

  • Figur 1: eine Draufsicht auf einen Schläger nach der Erfindung
  • Figur 2: einen querschnitt durch den den Schlägerkopf bildenden Rahmenbereich.
The invention is explained in more detail using an exemplary embodiment in the drawing figures. These show:
  • Figure 1: a plan view of a racket according to the invention
  • Figure 2: a cross section through the frame area forming the club head.

Unter Bezugnahme auf Figur 1 besteht der insgesamt mit 1 bezeichnete Schläger aus einem Handgriff 2, einem reifartigen Schlägerkopf 3, in dem die die Spielfläche 4 bildenden Saiten 5 kreuzweise einziehbar sind und einem Mittelbereich 6, der durch zwei Rahmenzweige 7, 8 gebildet wird, die eine etwa dreieckige Ausnehmung 9 zwischen sich einschließen.With reference to FIG. 1, the racket, generally designated 1, consists of a handle 2, a hoop-like racket head 3, in which the strings 5 forming the playing surface 4 can be drawn in crosswise and a central region 6, which is formed by two frame branches 7, 8 which enclose an approximately triangular recess 9 between them.

Wie in Figur 1 deutlich zu sehen ist, ist die Ausnehmung 9 bezogen auf die durch den Handgriff 2 und den Schlägerkopf 3 mittig verlaufende Mittellängsachse 10 des Schlägers 2 unsymetrisch ausgebildet.As can be clearly seen in FIG. 1, the recess 9 is asymmetrical in relation to the central longitudinal axis 10 of the racket 2, which extends centrally through the handle 2 and the racket head 3.

Jeder der beiden Rahmenzweige 7 und 8 weist eine in die Ausnehmung 9 hineinstehende Verdickung 11, 12 auf, wobei die Verdickung 11 des ersten Rahmenszweiges 7 in dem dem Handgriff 2 zugewandten Bereich der Ausnehmung 9 angeordnet ist, die Verdickung 12 hingegen befindet sich in dem dem Schlägerkopf 3 zugewandten Bereich der Ausnehmung 9.Each of the two frame branches 7 and 8 has a thickening 11, 12 projecting into the recess 9, the thickening 11 of the first frame branch 7 being arranged in the region of the recess 9 facing the handle 2, while the thickening 12 is located in the Area of the recess 9 facing the club head 3.

Weiterhin ist deutlich zu sehen, daß die drei Ecken der Ausnehmung mit drei unterschiedlichen Eckenrundungen 13, 14, 15 ausgerundet sind, wobei das Zentrum der dem Handgriff 2 zugewandten unteren Eckenrundung 13 von der Mittellängsachse 10 einen seitlichen Abstand aufweist. Die Zentren der dem Schlägerkopf 3 zugewandten Eckenrundungen 14 und 15 weisen von der Mittellängsachse den des Schlägers 1 unterschiedliche Abstände aus.Furthermore, it can be clearly seen that the three corners of the recess are rounded off with three different corner curves 13, 14, 15, the center of the lower corner curve 13 facing the handle 2 being at a lateral distance from the central longitudinal axis 10. The centers of the rounded corners 14 and 15 facing the club head 3 are at different distances from the club 1 from the central longitudinal axis.

Ferner ist die der Ausnehmung 9 zugewandte Innenkante 16 des ersten Rahmenzweiges 7 kürzer als die der Ausnehmung 9 zugewandte Innenkante 17 des zweiten Rahmenzweiges 8, was darauf zurückzuführen ist, daß die Eckenrundung 15 weiter in den Schlägerkopfbereich hineinverlegt ist als die Eckenrundung 14 auf der anderen Seite.Furthermore, the inner edge 16 of the first frame branch 7 facing the recess 9 is shorter than the inner edge 17 of the second frame branch 8 facing the recess 9, which is due to the fact that the corner rounding 15 is moved further into the club head area than the corner rounding 14 on the other side .

Die saitenbespannbare Spielfläche 4 des Schlägerkopfes 3 wird durch 2 Kreise 18, 19 mit unterschiedlichen Radien aufgespannt, wobei die beiden Kreise im Seitenbereich des Schlägerkopfes durch einen Übergang ineinander übergeführt werden. Die Radien der beiden Kreise 18, 19 verhalten sich etwa wie 0,94 zu 0,83, was im wesentlichen den Schwingungsverhältnissen zwischen Quarte und Quinte entspricht.The string-covered playing surface 4 of the club head 3 is spanned by two circles 18, 19 with different radii, the two circles in the side area of the club head being merged into one another by a transition. The radii of the two circles 18, 19 behave approximately as 0.94 to 0.83, which essentially corresponds to the vibration relationships between the fourth and fifth.

Das Zentrum 20 des größeren Kreises 18 ist auf dem Schnittpunkt des kleineren Kreises 19 mit der Mittellängsachse 10 angeordnet.The center 20 of the larger circle 18 is arranged at the intersection of the smaller circle 19 with the central longitudinal axis 10.

Die auf die Mittellängsachse 10 projezierten Abstände zwischen dem Zentrum des Griffes - oder anders ausgedrückt - dem tatsächlichen Greifpunkt, der zwischen dem Mittelhandknochen von Zeige- und Ringfinger liegt und dem Zentrum der dem Griff zugewandten Eckenrundungen 13 bzw. der dem Griff zugewandten Eckenrundung 13 und der dem Schlägerkopf 3 zugewandten Eckenrundung 14 verhält sich wie 1,111 zu 0,9375, die auf die Mittellängsachse 10 projezierten Abstände zwischen dem Zentrum 21 des Griffes und der Eckenrundung 13 zu den auf die mit Längsachse projezierten Abständen zwischen der Eckenrundung 13 und der Eckenrundung 15 verhalten sich wie 1,111 zu 1,0. Mit diesen Längenverhältnissen sind wiederum die Resonanzverhältnisse zwischen den Oberschwingungen Sekunde, Terz und Quarz einer Grundschwingung angesprochen.The distances projected onto the central longitudinal axis 10 between the center of the handle - or in other words - the actual gripping point, which lies between the metacarpus of the index and ring fingers and the center of the corner curves 13 facing the handle or the corner curve 13 facing the handle and The corner rounding 14 facing the club head 3 behaves like 1.111 to 0.9375, the distances projected onto the central longitudinal axis 10 between the center 21 of the handle and the corner rounding 13 relate to the distances projected onto the longitudinal axis between the corner rounding 13 and the corner rounding 15 like 1.111 to 1.0. With these aspect ratios, the resonance relationships between the harmonics second, third and quartz of a fundamental vibration are addressed.

Im folgenden wird auf Figur 2 Bezug genommen. Der dort dargestellte reifartige Schlägerkopf 2 weist in seinem querschnitt zweinebeneinanderliegende rohrförmige Ausnehmungen 22, 23 auf, wobei jeder Rohrquerschnitt im wesentlichen spiralförmig ausgebildet ist, was dadurch vorgenommen wird, daß die der Saitenbohrung 24 zugewandten Innenflächen 25 der rohrföhrmigen Ausnehmungen 22, 23 mit einem größeren Radius ausgebildet sind, der auf der Rahmenseite, die der Spielfläche zugewandt ist bei den Punkten 26 in einen kleineren Radius übergeht, der rahmenaussenseitig die Innenflächen der rohrföhrmigen Ausnehmungen 22, 23 definiert. Rahmenaußenseitig gehen die Radienübergänge der schraubenförmigen Rohrquerschnitte mit je einer konvexen Rundung 27 ineinanderüber, die sich zu beiden Seiten der Seitenbohrung 24 gegenüberliegen.In the following, reference is made to FIG. 2. The rip-like racket head 2 shown there has in its cross section two mutually adjacent tubular recesses 22, 23, with each tube cross section being essentially spiral, which is done in that the inner surface 25 facing the string bore 24 of the tubular recesses 22, 23 are formed with a larger radius, which is on the frame side facing the playing surface at points 26 merges into a smaller radius that defines the inner surfaces of the tubular recesses 22, 23 on the outside of the frame. On the outside of the frame, the radius transitions of the helical pipe cross-sections merge into one another, each with a convex rounded portion 27, which are opposite each other on both sides of the side bore 24.

Claims (14)

  1. String-tensionable racquet (1) for ball games, more especially tennis, badminton, squash racquets or the like, having a hand grip (2), a hoop-like racquet head (3) into which the strings forming the playing surface are insertable, and a central portion connecting the hand grip (2) and the racquet head (3), said central portion being formed by two frame branches (7, 8) defining a substantially triangular recess (9), whereby the recess (9) has a non-symmetrical configuration relative to the central longitudinal axis (10) of the racquet (1) extending centrally through the hand grip (2) and the racquet head (3), characterised in that each of the frame branches (7, 8) comprises a thickened portion (11, 12) extending into the recess, the thickened portion (11) of the first frame branch (7) is disposed in the region of the recess (9) facing the hand grip (2) and the thickened portion (12) of the second frame branch (8) is disposed in the region of the recess (9) facing the racquet head (3).
  2. Racquet according to claim 1, characterised in that the three corners of the recess (9) are rounded-out with three different corner roundings (13, 14, 15).
  3. Racquet according to one of the preceding claims 1 or 2, characterised in that the centre of the corner rounding (13) facing the hand grip (2) has a spacing from the central longitudinal axis (10).
  4. Racquet according to one of the preceding claims, characterised in that the centres of the corner roundings (14, 15) facing the racquet head (3) have different spacings from the central longitudinal axis (10) of the racquet.
  5. Racquet according to one of the preceding claims, characterised in that the inner edge (16) of the first frame branch (7) facing the recess (9) is shorter than the inner edge (17) of the second frame branch (8) facing the recess (9).
  6. Racquet according to one of the preceding claims, characterised in that the string-tensionable playing surface (4) of the racquet head (3) is stretched by two circles (18, 19) of different radii, the centres of which circles are disposed on the central longitudinal axis (10).
  7. Racquet according to one of the preceding claims, characterised in that the radii of the two circles (18, 19) are substantially 0.94 to 0.83, more especially 0.9375 to 0.833.
  8. Racquet according to one of claims 6 or 7, characterised in that the centre (20) of the larger circle (18) is disposed on the intersection between the smaller circle (19) and the central longitudinal axis (10).
  9. Racquet according to one of the preceding claims, characterised in that the spacings projected on the central longitudinal axis (10) between the centre (21) of the hand grip (2) and the centre of the corner rounding (13) facing the hand grip, or respectively of the corner rounding (13) facing the grip and the corner roundings (14, 15) facing the racquet head (3), are substantially 1.1 (more especially 1.111) to 0.94 (more especially 0.9375), or respectively 1.111 to 1.0.
  10. Racquet according to one of the preceding claims, characterised in that the radius of the larger circle (18) corresponds to the spacing projected on the central longitudinal axis (10) between the corner rounding (13) facing the hand grip and the further corner rounding (14) disposed at the racquet head end of the first frame branch (7).
  11. Racquet according to one of the preceding claims, characterised by the avoidance of parallel-extending frame surfaces.
  12. Racquet according to one of the preceding claims, characterised in that the hoop-like racquet head (3) has a cross-section with two adjacently-situated tube-like recesses (22, 23), the tube cross-sections of said recesses having a substantially helical configuration.
  13. Racquet according to claim 12, characterised in that the radii transitions of the screw-shaped tube cross-sections are provided with a convex rounding (27).
  14. Racquet according to claim 13, characterised in that the two convex roundings (27) are situated opposite each other.
EP92100225A 1991-01-12 1992-01-09 Strings tensionable racket for ball games, in particular tennis, squash or the same Expired - Lifetime EP0495387B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9100325U 1991-01-12
DE9100325U DE9100325U1 (en) 1991-01-12 1991-01-12 A stringed racket for playing with balls, especially a tennis racket, squash racket or similar.

Publications (2)

Publication Number Publication Date
EP0495387A1 EP0495387A1 (en) 1992-07-22
EP0495387B1 true EP0495387B1 (en) 1996-04-10

Family

ID=6863284

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92100225A Expired - Lifetime EP0495387B1 (en) 1991-01-12 1992-01-09 Strings tensionable racket for ball games, in particular tennis, squash or the same

Country Status (4)

Country Link
EP (1) EP0495387B1 (en)
AT (1) ATE136474T1 (en)
DE (2) DE9100325U1 (en)
ES (1) ES2088508T3 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4031180A1 (en) * 1990-10-03 1992-04-09 Matthias S Bothe RACKETS, ESPECIALLY TENNIS, SQUASH, BADMINTON OR RACKETBALL RACKETS
FR2689022B1 (en) * 1992-03-31 1994-10-28 Rossignol Sa Tennis racket or similar.
FR2707506B1 (en) * 1993-06-29 1995-09-08 Rossignol Sa Tennis racket or the like.
FR2821756B1 (en) * 2001-03-12 2003-06-06 Rossignol Sa TENNIS, SQUASH OR BADMINGTON RACQUET

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1322606A (en) * 1971-08-12 1973-07-11 Yoneyama Racket Kk Games racket
US4413822A (en) * 1981-07-31 1983-11-08 American Sports Equipment Elastic core composite structure and method of making same
IT8153581V0 (en) * 1981-09-04 1981-09-04 Gibello Carlo RACKET FOR THE PLAY OF TENNIS
DE3731529A1 (en) * 1987-09-18 1989-03-30 Kneissl Tirol Sportartikel Ag BALL STRIKE, ESPECIALLY TENNIS OR SQUASH RACKETS
EP0530180A1 (en) * 1989-06-06 1993-03-10 Josef Baumgartner Tennis racket

Also Published As

Publication number Publication date
DE9100325U1 (en) 1991-04-04
DE59205921D1 (en) 1996-05-15
ATE136474T1 (en) 1996-04-15
ES2088508T3 (en) 1996-08-16
EP0495387A1 (en) 1992-07-22

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