EP0301530B1 - Racket, particulary for tennis - Google Patents

Racket, particulary for tennis Download PDF

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Publication number
EP0301530B1
EP0301530B1 EP88112183A EP88112183A EP0301530B1 EP 0301530 B1 EP0301530 B1 EP 0301530B1 EP 88112183 A EP88112183 A EP 88112183A EP 88112183 A EP88112183 A EP 88112183A EP 0301530 B1 EP0301530 B1 EP 0301530B1
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EP
European Patent Office
Prior art keywords
racquet
frame
diagonals
arms
racket
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EP88112183A
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German (de)
French (fr)
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EP0301530A1 (en
Inventor
Hans Zinner
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Tegro Gross- und Einzelhandel fur Tennisartikel GmbH
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Tegro Gross- und Einzelhandel fur Tennisartikel GmbH
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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
    • A63B49/03—Frames characterised by throat sections, i.e. sections or elements between the head and the shaft

Definitions

  • the invention relates to a racket, in particular for tennis, with a racket head which is delimited by a frame consisting of a tube, the frame being guided to the handle with both arms and ending there.
  • Rhots of the generic type are known from sports such as tennis, but also squash or badminton. They are produced by cutting an initially straight, tubular material to the required length and then bending it in such a way that the arms which run symmetrically to one another come to lie against one another at the end and are rigidly connected to this and to one another by applying and fastening the handle. In the area of the racket head, the bores which later receive the sides and thereby form the covering are introduced, and in addition a racket heart which limits the racket head in the direction of the handle and connects the two frames to one another is arranged. The racket is then either embedded in plastic or painted.
  • the cross section of the tube used here is in principle arbitrary, it can in particular be round, elliptical, rectangular or square.
  • the tube is hollow on the inside or filled with a non-load-bearing material to improve the damping properties.
  • Ld.R. hits the ball during the game on the club head outside of the central axis defined by the handle, so that a torsion of the entire club head is triggered around this straight line.
  • their amplitude is determined by the distance of the point of impact from the axis and the speed of the impacting ball. This causes deviations of the kicked-back ball from the departure direction determined by the reflection laws in the case of an ideally rigid club head, which give rise to inaccuracies in the ball being played and deviation from the desired destination.
  • the term “diagonal” defines a course that starts from the front of one arm and ends on the back of the other arm of the frame. This applies to both arms, so that a total of two diagonals are to be attached, through which a plane is spanned, which is approximately perpendicular to that of the club head, but can have a certain curvature in itself, so that a right angle in the area of the connection is possible on both arms of the frame.
  • the arrangement according to the invention provides support and equilateral stabilization against torsion of the club head.
  • the rule is that both diagonals intersect at one point in the axis of the racket defined by the handle, although in principle a mutual offset and distance with respect to this axis is conceivable and possible. Viewed in the direction of the center axis of the racket, both diagonals may form two intersecting straight lines when viewed in projection.
  • the advantage that can be achieved with the invention consists primarily in the support caused by the above-described mode of action and the torsional stiffening of the club head caused thereby.
  • the fastening points of the diagonal are arranged far out as possible, that is to say in the region of the outer edge of the arms. The moment exerted on the arms by the diagonals and opposing the torsion then becomes maximum.
  • both diagonals as a single web, which is then seen in the axis direction of the racket and is formed from two triangles connected to one another at their tips, the bases of which each abut the frame.
  • the triangular shape is only a first approximation, since in general the shape of the web in both coordinates perpendicular to the central axis will be limited by hyperbolas due to the adaptation to the outer edge of the frame and in order to avoid two-dimensional transitions.
  • the web spans either a plane or a surface so curved that a right angle is included at the transition to the frame. The expansion in the direction of the axis, which is significant for increasing the air resistance, is minimal here.
  • the contact area of the diagonal to the frame should preferably be increased.
  • the improvement in the force transfer due to the enlarged edition additionally results in a support against the rotational stress of the racket about an axis of rotation running perpendicular to the plane of the racket head. It is a support against the shape of the club head deforming loads.
  • the axis of symmetry of the diagonal or the truncated cone end vertically on the frame.
  • This symmetry axis defined by the symmetrical arrangement of the truncated cone or the two diagonals runs in the plane defined by the club head.
  • a certain curvature is required, the extent of which is determined by the height of the arrangement in the region between the handle and the club head. The curvature increases when the club head is approached. The right angle requires maximum torque to be applied when the frame is twisted.
  • the transitions between frame and diagonal or web asymptotically since otherwise high stresses that would cause premature breakdown would occur at the transition points.
  • the torsional stiffening according to the invention is used in addition and next to the racket heart and whether it is used directly as a racket heart.
  • the term "club heart” is to be interpreted in the sense of the invention so that the sides forming the club head are at least partially taken up. A bat heart therefore needs additional holes through which the sides could be pulled and stretched.
  • Figure 1 shows the part of a racket according to the invention seen perpendicular to the plane of the racket head 1.
  • the two arms of the frame are shown, which merge downwards into the handle (not shown here) and, at the top, likewise not shown, merge into one another and completely enclose the racket head 1.
  • the covering formed by the sides 4 is located in the racket head 1.
  • the structure of the racket is symmetrical with respect to the central axis 5 defined by the handle.
  • the club head is limited in the direction of the grip by the club heart 6. Part of pages 4 ends there.
  • both racket heart 6 and the known and between the racket heart and handle between the two arms 2, 3 the frame web 7 are of the shape described in more detail below.
  • the borders of both the club heart 6 and the web 7 are parabolas, the upper border facing the club heart being of less curvature.
  • the contact surface 8 of bat heart 6 or web 7 on the arms 2, 3 is widened.
  • the structure is also symmetrical to the central axis 5.
  • FIG. 2 shows a section through web 7 along the line I-I and it can be seen much better from this that web 7 (in a similar way to beater heart 6) is approximately in the form of a hyperboloid.
  • the boundaries are perpendicular to the club head in the sectional plane, as can now be clearly seen in FIG. 2, two parabolas of the same curvature, the transition to the arms 2, 3 of the frame is as wide as possible and also limited by parabola in the sectional view.
  • FIG. 3 Another embodiment in the same sectional view as FIG. 2 shows FIG. 3, in which the two frames are connected to one another via a reinforcement consisting of two intersecting diagonals 9, 10. From this illustration, the effect and stabilization, and thus the generation of the torsional stiffness, which work towards supporting the two arms 2, 3 against the same torsion of the arms 2, 3, can be recognized and removed most easily.
  • the result is a racket that allows and allows a high degree of directional accuracy of the ball being played.

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  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Golf Clubs (AREA)
  • Laminated Bodies (AREA)
  • Compounds Of Unknown Constitution (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)

Abstract

1. Racquet especially for tennis having a racquet head that is delimited by a surrounding frame, said frame extending to the handle with two arms and terminating there, wherein the two arms 2, 3 of the frame are connected together via diagonals 9, 10 between the racquet head 1 and handle, and the plane encompassed by said two diagonals 9, 10 is disposed approximately vertically to the plane of the racquet head, and symmetrically about the center axis 5 of the racquet.

Description

Die Erfindung bezieht sich auf einen Schläger, insbesondere für Tennis mit einem Schlägerkopf, der durch einen aus einem Rohr bestehenden Rahmen begrenzt ist, wobei der Rahmen mit beiden Armen zum Griff geführt ist und dort endet.The invention relates to a racket, in particular for tennis, with a racket head which is delimited by a frame consisting of a tube, the frame being guided to the handle with both arms and ending there.

Von Sportarten wie Tennis, aber auch Squash oder Badminton her sind Schläger der gattungsgemäßen Art bekannt. Sie werden dadurch hergestellt, daß ein zunächst gerades, rohrförmiges Material auf erforderliche Länge geschnitten und anschließend so gekrümmt wird, daß die symmetrisch zueinander verlaufenden Arme endseitig aneinander zu liegen kommen und durch Aufbringen und Befestigen des Griffes starr mit diesem sowie untereinander verbunden werden. Im Bereich des Schlägerkopfes werden die später die Seiten aufnehmendend und dadurch die Bespannung bildenden Bohrungen eingebracht sowie zusätzlich ein den Schlägerkopf in Richtung auf den Griff zu begrenzendes und beide Rahmen miteinander verbindendes Schlägerherz angeordnet. Der Schläger wird anschließend entweder in Kunststoff eingebettet oder mit einer Lackierung versehen. Der Querschnitt des hierbei verwendeten Rohres ist grundsätzlich beliebig, er kann insbesondere rund, elliptisch, rechteckförmig oder quadratisch sein. Das Rohr ist im Inneren hohl oder aber zur Verbesserung der Dämpfungs eigenschaften mit einem nichttragenden Material ausgefüllt. Als Rohrmaterial kommen in Betracht Metall, Graphit, Kunststoff und Kompositbauweisen insbesondere GFK.Racquets of the generic type are known from sports such as tennis, but also squash or badminton. They are produced by cutting an initially straight, tubular material to the required length and then bending it in such a way that the arms which run symmetrically to one another come to lie against one another at the end and are rigidly connected to this and to one another by applying and fastening the handle. In the area of the racket head, the bores which later receive the sides and thereby form the covering are introduced, and in addition a racket heart which limits the racket head in the direction of the handle and connects the two frames to one another is arranged. The racket is then either embedded in plastic or painted. The cross section of the tube used here is in principle arbitrary, it can in particular be round, elliptical, rectangular or square. The tube is hollow on the inside or filled with a non-load-bearing material to improve the damping properties. Metal, graphite, plastic and composite construction methods, in particular GRP, come into consideration as pipe material.

Ld.R. trifft der während des Spieles auf den Schlägerkopf auftreffende Ball außerhalb der durch den Griff definierten Mittelachse auf, so daß eine Torsion des gesamten Schlägerkopfes um diese Gerade ausgelöst wird. Neben den Materialeigenschaften bestimmt sich deren Amplitude durch den Abstand des Auftreffpunktes von der Achse und die Geschwindigkeit des auftreffenden Balles. Hierdurch werden Abweichungen des zurückgeschlagenen Balles von der bei ideal starrem Schlägerkopf durch die Reflexionsgesetze bestimmten Abflugrichtung hervorgerufen, die zu Ungenauigkeiten des gespielten Balles und Abweichung vom gewünschten Ziel Anlaß geben. Da der Griff durch die Hand des Spielers fixiert ist, treten aufgrund der Torsion des Schlägerkopfes als ganzes zusätzliche Torsionen desjenigen Teiles des Rahmens, der sich zwischen Schlägerkopf und Griff befindet, in dem Sinne auf, daß beide dort verlaufenden Teile des Rahmens um gleichsinnig ihre Längsachse tordieren.Ld.R. hits the ball during the game on the club head outside of the central axis defined by the handle, so that a torsion of the entire club head is triggered around this straight line. In addition to the material properties, their amplitude is determined by the distance of the point of impact from the axis and the speed of the impacting ball. This causes deviations of the kicked-back ball from the departure direction determined by the reflection laws in the case of an ideally rigid club head, which give rise to inaccuracies in the ball being played and deviation from the desired destination. Since the grip is fixed by the hand of the player, additional torsions of the part of the frame located between the racket head and the grip occur due to the torsion of the racket head, in the sense that both parts of the frame running there in the same direction have their longitudinal axis twist.

Hiervon ausgehend hat sich die Erfindung die Weiterentwicklung derartiger Schläger dahingehend zur Aufgabe gemacht, daß die Genauigkeit des abgespielten Balles wesentlich verbessert und erhöht wird.Proceeding from this, the invention has made the further development of such rackets the task that the accuracy of the played ball is significantly improved and increased.

Gelöst wird diese Aufgabe erfindungsgemäß dadurch, daß zwischen Schlägerkopf und Griff beide Arme des Rahmens über Diagonalen miteinander verbunden sind und die durch beide Diagonalen aufgespannte Ebene etwa senkrecht zur Ebene des Schlägerkopfes verläuft.This object is achieved according to the invention in that between the club head and the handle both arms of the frame are connected to one another via diagonals and the plane spanned by the two diagonals runs approximately perpendicular to the plane of the club head.

Der Begriff "Diagonale" definiert im Sinne der Erfindung einen Verlauf der von der Vorderseite des einen Armes ausgeht und auf der Rückseite des anderen Armes des Rahmens endet. Dies trifft für beide Arme zu, so daß insgesamt zwei Diagonalen anzubringen sind, durch die eine Ebene aufgespannt wird, die in etwa senkrecht zu der des Schlägerkopfes verläuft, jedoch in sich eine gewisse Krümmung aufweisen kann, so daß ein rechter Winkel im Bereich des Anschlusses an beiden Armen des Rahmens möglich ist. Hierdurch entsteht eine Abstützung und eine Steifigkeit gegen Torsion des Schlägerkopfes dadurch, daß bei einer Torsion in Richtung der einen Diagonale ein auf Verkürzen der einen Diagonalen gerichtete Kräfte auftreten und in Richtung der anderen Diagonale Kräfte, die eine Dehnung derselben zu wirken versuchen. Durch die erfindungsgemäße Anordnung wird eine Abstützung und gleichseitige Stabilisierung gegen Torsion des Schlägerkopfes erreicht. Der Regelfall ist, daß beide Diagonalen sich in der durch den Griff definierten Achse des Schlägers in einem Punkt schneiden, obwohl grundsätzlich ein gegenseitiger Versatz und Abstand im Bezug auf diese Achse denkbar und möglich ist. In Richtung der Mittelachse des Schlägers gesehen, bilden beide Diagonalen evtl. in Projektion gesehen, zwei sich schneidende Geraden.In the context of the invention, the term “diagonal” defines a course that starts from the front of one arm and ends on the back of the other arm of the frame. This applies to both arms, so that a total of two diagonals are to be attached, through which a plane is spanned, which is approximately perpendicular to that of the club head, but can have a certain curvature in itself, so that a right angle in the area of the connection is possible on both arms of the frame. This results in a support and a rigidity against torsion of the club head in that a torsion in the direction of the one diagonal results in a shortening of the one diagonal forces and in the direction of the other diagonal forces which attempt to effect an expansion thereof. The arrangement according to the invention provides support and equilateral stabilization against torsion of the club head. The rule is that both diagonals intersect at one point in the axis of the racket defined by the handle, although in principle a mutual offset and distance with respect to this axis is conceivable and possible. Viewed in the direction of the center axis of the racket, both diagonals may form two intersecting straight lines when viewed in projection.

Der mit der Erfindung erreichbare Vorteil besteht in erster Linie in der durch vorbeschriebene Wirkungsweise bedingten Abstützung und dadurch hervorgerufenen Torsionsvorsteifung des Schlägerkopfes.The advantage that can be achieved with the invention consists primarily in the support caused by the above-described mode of action and the torsional stiffening of the club head caused thereby.

Das Ergebnis ist eine wesentlich verbesserte Zielgenauigkeit und Treffsicherheit der gespielten Bälle, die von außeraxialen Auftreffpunkten herrühren. Dieser Effekt ist um so bedeutender, je weiter sich der Rahmen senkrecht zum Schlägerkopf erstreckt (Großkopfschläger). Gleichzeitig wird durch die erfindungsgemäße Anordnung der Luftwiderstand nicht wesentlich erhöht.The result is a significantly improved accuracy and accuracy of the balls played, which result from off-axis impact points. This effect is all the more significant the further the frame extends perpendicular to the club head (big head racket). At the same time, the air resistance is not significantly increased by the arrangement according to the invention.

Zur Erreichung einer maximalen Abstützung des Rahmens gegen Torsion ist bevorzugt, die Befestigungspunkte der Diagonale möglichst weit außen, also im Bereich der Außenkante der Arme anzuordnen. Das durch die Diagonalen dann auf die Arme ausgeübte und der Torsion entgegenstehende Moment wird dann maximal.To achieve maximum support of the frame against torsion, it is preferred to arrange the fastening points of the diagonal as far out as possible, that is to say in the region of the outer edge of the arms. The moment exerted on the arms by the diagonals and opposing the torsion then becomes maximum.

In einer Weiterbildung wird vorgeschlagen, beide Diagonalen als einen einheitlichen Steg auszubilden, der dann in Achsenrichtung des Schlägers gesehen, aus zwei an ihren Spitzen miteinander verbundenen Dreiecken gebildet wird, deren Basis jeweils am Rahmen anliegt. Allerdings stellt die Dreiecksform nur eine erste Näherung dar, da im allgemeinen durch die Anpassung an die äußere Berandung des Rahmens und aus dem Bestreben heraus, flächige Übergänge zu vermeiden die Form des Steges in beiden Koordinaten senkrecht zur Mittelachse durch Hyperbeln begrenzt sein wird. Der Steg spannt entweder eine Ebene oder eine derart gekrümmte Fläche auf, daß am Übergang zum Rahmen ein rechter Winkel eingeschlossen ist. Die für die Erhöhung des Luftwiderstandes bedeutende Ausdehnung in Richtung der Achse ist hierbei minimal.In a further development, it is proposed to design both diagonals as a single web, which is then seen in the axis direction of the racket and is formed from two triangles connected to one another at their tips, the bases of which each abut the frame. However, the triangular shape is only a first approximation, since in general the shape of the web in both coordinates perpendicular to the central axis will be limited by hyperbolas due to the adaptation to the outer edge of the frame and in order to avoid two-dimensional transitions. The web spans either a plane or a surface so curved that a right angle is included at the transition to the frame. The expansion in the direction of the axis, which is significant for increasing the air resistance, is minimal here.

Zur Verbesserung der Kraftübertragung zwischen Rahmen und Diagonalen ist bevorzugt die Berührungsfläche der Diagonale zum Rahmen hin zu vergrößern. Im Falle eines Steges ergibt sich damit die Form eines Hyperboloids, dessen begrenzende Hyperboläste in Achsenrichtung gesehen gleiche Krümmung, in Richtung senkrecht zum Schlägerkopf gesehen unterschiedliche Krümmungen der Berandungsparabein aufweisen. Die durch die vergrößerte Auflage bedingte Verbesserung des Kraft- überganges bewirkt zusätzlich eine Abstützung auf Drehbeanspruchung des Schlägers um eine senkrecht zur Schlägerkopfebene verlaufende Rotationsachse. Es handelt sich um Abstützungen gegen die Form des Schlägerkopfes deformierende Belastungen.To improve the transmission of force between the frame and the diagonal, the contact area of the diagonal to the frame should preferably be increased. In the case of a web, this results in the shape of a hyperboloid, the limiting hyperbola branches of which have the same curvature when viewed in the axial direction and have different curvatures of the boundary parabein when viewed in the direction perpendicular to the club head. The improvement in the force transfer due to the enlarged edition additionally results in a support against the rotational stress of the racket about an axis of rotation running perpendicular to the plane of the racket head. It is a support against the shape of the club head deforming loads.

Eine ebenfalls verbesserte Abstützung auf dem Rahmen erhält man, wenn die Diagonalen in zwei, an der Spitze miteinander verbundenen Hohlkegelstümpfen integriert sind, deren Basis am Rahmen anliegt. Die Kontaktfläche am Rahmen ist im allgemeinsten Fall eine Ellipse. Die Kegelstümpfe sind in ihrem Inneren entweder hohl oder mit nichttragenden, ähnlich wie beim Rahmen Dämpfung bewirkendes Material gefüllt. Die die Abstützung gegen Torsion bewirkende Kraftübertragung erfolgt allein über den Mantel der Hohlkegel. Im Idealfall sind die Kegelstümpfe nahezu von der Gestalt eines Kegels, mit dem einzigen geringfügigen Unterschied, daß die an der Spitze herzustellende Verbindung keinen idealisierten Punkt zuläßt sondern eine Kontaktfläche endlicher Ausdehnung erfordert. Die Spitze des Kegels ist dann in sehr geringer Höhe abgeschnitten.An improved support on the frame is also obtained if the diagonals are integrated in two hollow truncated cones, which are connected to each other at the tip and whose base lies against the frame. In the most general case, the contact surface on the frame is an ellipse. The inside of the truncated cones are either hollow or filled with non-load-bearing material, similar to that used for the frame damping. The force transmission which provides support against torsion takes place solely via the shell of the hollow cone. In the ideal case, the truncated cones are almost of the shape of a cone, with the only slight difference that the connection to be made at the tip does not allow an idealized point but requires a contact area of finite extension. The tip of the cone is then cut off at a very low height.

Zur verbesserten Abstützung der Torsionsbewegung ist in einer Weiterbildung vorgeschlagen, die Symmetrieachse von Diagonale oder Kegelstumpf senkrecht auf dem Rahmen enden zu lassen. Diese durch die symmetrische Anordnung vom Kegelstumpf oder der beiden Diagonalen festgelegte Symmetrieachse verläuft in der durch den Schlägerkopf definierten Ebene. Um senkrecht auf dem Rahmen bzw. Längsachse zu enden, ist eine bestimmte Krümmung erforderlich, die in ihrem Ausmaß bestimmt wird durch die Höhe der Anordnung im Bereich zwischen Griff und Schlägerkopf. Die Krümmung nimmt zu bei Annäherung an den Schlägerkopf. Der rechte Winkel bedingt die Ausübung eines maximalen Drehmomentes bei Torsion des Rahmens.To improve the support of the torsion movement, it is proposed in a further development to have the axis of symmetry of the diagonal or the truncated cone end vertically on the frame. This symmetry axis defined by the symmetrical arrangement of the truncated cone or the two diagonals runs in the plane defined by the club head. In order to end perpendicular to the frame or longitudinal axis, a certain curvature is required, the extent of which is determined by the height of the arrangement in the region between the handle and the club head. The curvature increases when the club head is approached. The right angle requires maximum torque to be applied when the frame is twisted.

Grundsätzlich ist von Vorteil, die Übergänge zwischen Rahmen und Diagonale bzw. Steg asymptotisch zu wählen, da andernfalls an den Ubergangsstellen punktuell hohe und zum frühzeitigen Zerbrechen Anlaß gebende Belastungen auftreten würden. Weiter steht im Rahmen der Erfindung frei, ob die erfindungsgemäße Verdrehungsversteifung zusätzlich und neben dem Schlägerherz eingesetzt und ob sie direkt als Schlägerherz genutzt wird. Hierbei ist der Begriff "Schlägerherz" im Sinne der Erfindung so auszulegen, daß die den Schlägerkopf bildenden Seiten zumindestens teilweise aufgenommen werden. Ein Schlägerherz benötigt deshalb zusätzliche Bohrungen, durch die die Seiten gezogen und aufgespannt werden könnten.Basically, it is advantageous to choose the transitions between frame and diagonal or web asymptotically, since otherwise high stresses that would cause premature breakdown would occur at the transition points. Furthermore, it is free within the scope of the invention whether the torsional stiffening according to the invention is used in addition and next to the racket heart and whether it is used directly as a racket heart. Here, the term "club heart" is to be interpreted in the sense of the invention so that the sides forming the club head are at least partially taken up. A bat heart therefore needs additional holes through which the sides could be pulled and stretched.

Weitere Einzelheiten, Merkmale und Vorteile der Erfindung lassen sich dem nachfolgenden Beschreibungsteil entnehmen, in dem anhand der Zeichnung ein Ausführungsbeispiel der Erfindung näher erläutert wird. Es zeigen:

  • Figur 1 einen erfindungsgemäßen Schläger mit Schlägerherz und zusätzlicher Verdrehungsversteifung.
  • Figur 2 einen Schnitt gemäß Figur 1 entlang der Linie I-I.
  • Figur 3 ein Schläger mit einer Verdrehversteifung aus zwei Diagonalen.
Further details, features and advantages of the invention can be found in the following description, in which an embodiment of the invention is explained in more detail with reference to the drawing. Show it:
  • 1 shows a racket according to the invention with a racket heart and additional torsional stiffening.
  • 2 shows a section according to FIG. 1 along line II.
  • Figure 3 shows a racket with a torsional stiffening from two diagonals.

Figur 1 zeigt senkrecht zur Ebene des Schlägerkopfes 1 gesehen den Teil eines erfindungsgemäßen Schlägers. Wiedergegeben sind die beiden Arme des Rahmens, die nach unten zu in den hier nicht gezeigten Griff einmünden und an ihrer Oberseite, ebenfalls nicht wiedergegeben, ineinander übergehen und den Schlägerkopf 1 vollständig umschließen. In an sich üblicher Weise befindet sich im Schlägerkopf 1 die durch die Seiten 4 gebildete Bespannung. Der Aufbau des Schlägers ist bezüglich der durch den Griff definierten Mittelachse 5 symmetrisch. Wie ebenfalls geläufig, wird der Schlägerkopf in Richtung auf den Griff zu durch das Schlägerherz 6 begrenzt. Ein Teil der Seiten 4 endet dort.Figure 1 shows the part of a racket according to the invention seen perpendicular to the plane of the racket head 1. The two arms of the frame are shown, which merge downwards into the handle (not shown here) and, at the top, likewise not shown, merge into one another and completely enclose the racket head 1. In a conventional manner, the covering formed by the sides 4 is located in the racket head 1. The structure of the racket is symmetrical with respect to the central axis 5 defined by the handle. As is also common, the club head is limited in the direction of the grip by the club heart 6. Part of pages 4 ends there.

Für die Erfindung ist nunmehr entscheidend, daß sowohl Schlägerherz 6 als auch der an sich bekannte und zwischen Schlägerherz und Griff zwischen den beiden Armen 2, 3 den Rahmens befindliche Steg 7 von der im folgenden näher beschriebenen Gestalt sind. Die Berandung sowohl vom Schlägerherz 6 als auch Steg 7 sind Parabeln, wobei die jeweils obere, dem Schlägerherz zugewandte Berandung von geringerer Krümmung ist. Die Berührungsfläche 8 von Schlägerherz 6 bzw. Steg 7 an den Armen 2, 3 ist verbreitert. Ebenso ist der Aufbau symmetrisch zur Mittelachse 5.It is now crucial for the invention that both racket heart 6 and the known and between the racket heart and handle between the two arms 2, 3 the frame web 7 are of the shape described in more detail below. The borders of both the club heart 6 and the web 7 are parabolas, the upper border facing the club heart being of less curvature. The contact surface 8 of bat heart 6 or web 7 on the arms 2, 3 is widened. The structure is also symmetrical to the central axis 5.

In Figur 2 ist ein Schnitt durch Steg 7 entlang der Linie I-I wiedergegeben und es läßt sich hieraus wesentlich besser erkennen, daß Steg 7 ( in ähnlicher Weise wie Schlägerherz 6) etwa von der Form eines Hyperboloids ist. Die Berandungen sind in der Schnittebene senkrecht zum Schlägerkopf, wie auß Figur 2 nunmehr gut zu erkennen, zwei Parabeln gleicher Krümmung, der Übergang zu den Armen 2, 3 des Rahmens ist möglichst breit gewählt und ebenfalls in Schnittdarstellung von Parabel begrenzt.FIG. 2 shows a section through web 7 along the line I-I and it can be seen much better from this that web 7 (in a similar way to beater heart 6) is approximately in the form of a hyperboloid. The boundaries are perpendicular to the club head in the sectional plane, as can now be clearly seen in FIG. 2, two parabolas of the same curvature, the transition to the arms 2, 3 of the frame is as wide as possible and also limited by parabola in the sectional view.

Eine andere Ausführungsform in gleicher Schnittdarstellung wie Figur 2 zeigt Figur 3, in der die beiden Rahmen über einen aus zwei sich kreuzenden Diagonalen 9, 10 bestehenden Verstärkung miteinander verbunden sind. Aus dieser Darstellung läßt sich am leichtesten die auf Abstützung der beiden Arme 2,3 gegen gleichsinnige Torsion der Arme 2,3 hinarbeitende Wirkung und Stabilisierung und damit die Erzeugung der Verdrehsteifigkeit erkennen und entnehmen.Another embodiment in the same sectional view as FIG. 2 shows FIG. 3, in which the two frames are connected to one another via a reinforcement consisting of two intersecting diagonals 9, 10. From this illustration, the effect and stabilization, and thus the generation of the torsional stiffness, which work towards supporting the two arms 2, 3 against the same torsion of the arms 2, 3, can be recognized and removed most easily.

Im Ergebnis erhält man einen Schläger, der ein hohes Maß an Richtungsgenauigkeit des abgespielten Balles erlaubt und zuläßt.The result is a racket that allows and allows a high degree of directional accuracy of the ball being played.

Claims (8)

1. Racquet especially for tennis having a racquet head that is delimited by a surrounding frame, said frame extending to the handle with two arms and terminating there, wherein the two arms 2, 3 of the frame are connected together via diagonals 9, 10 between the racquet head 1 and handle, and the plane encompassed by said two diagonals 9, 10 is disposed approximately vertically to the plane of the racquet head, and symmetrically about the center axis 5 of the racquet.
2. Racquet according to claim 1 wherein the fastening point of the two diagonals 9, 10 is disposed in the vicinity of the outer edge of the arms 2, 3.
3. Racquet according to claim 1 or 2 wherein the two diagonals 9, 10 form a bridge 7 in area contact with the frame.
4. Racquet according to one of claims 1 to 3 wherein said diagonals 9, 10 have an enlarged contact 8 with said frame.
5. Racquet according to one of claims 1 to 4 wherein the two truncated cones connected at their tips are fastened with their bases on the arms 2, 3.
6. Racquet according to one of claims 1 to 5 wherein the axis of said diagonal or truncated cone terminates vertically on the arms of said frame.
7. Racquet according to one of claims 1 to 6 wherein the transition between said frame and diagonals 9, 10 is asymptotic.
8. Racquet according to one of claims 1 to 7 wherein the diagonals 9, 10 form the racquet heart 6.
EP88112183A 1987-07-29 1988-07-28 Racket, particulary for tennis Expired - Lifetime EP0301530B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88112183T ATE51532T1 (en) 1987-07-29 1988-07-28 RACKETS ESPECIALLY FOR TENNIS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3725117 1987-07-29
DE19873725117 DE3725117A1 (en) 1987-07-29 1987-07-29 RACKETS IN PARTICULAR FOR TENNIS

Publications (2)

Publication Number Publication Date
EP0301530A1 EP0301530A1 (en) 1989-02-01
EP0301530B1 true EP0301530B1 (en) 1990-04-04

Family

ID=6332624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88112183A Expired - Lifetime EP0301530B1 (en) 1987-07-29 1988-07-28 Racket, particulary for tennis

Country Status (4)

Country Link
EP (1) EP0301530B1 (en)
AT (1) ATE51532T1 (en)
DE (2) DE3725117A1 (en)
ES (1) ES2015608B3 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1562881A (en) * 1923-06-29 1925-11-24 Gower Francis William Tennis racket and the like
FR1568145A (en) * 1968-02-27 1969-05-23
FR1578059A (en) * 1968-05-07 1969-08-14
FR2038747A5 (en) * 1969-03-28 1971-01-08 Chervin Michel
BE795562A (en) * 1972-02-18 1973-06-18 Franz Volkl O H G TENNIS RACKET
US4614341A (en) * 1984-07-19 1986-09-30 David Fernandez Tennis racket frame made of metal oxide fibers and ceramic particles

Also Published As

Publication number Publication date
EP0301530A1 (en) 1989-02-01
DE3725117A1 (en) 1989-01-26
ES2015608B3 (en) 1990-09-01
ATE51532T1 (en) 1990-04-15
DE3860066D1 (en) 1990-05-10

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