EP0440682B1 - Process and device for stringing rackets for ball games - Google Patents

Process and device for stringing rackets for ball games Download PDF

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Publication number
EP0440682B1
EP0440682B1 EP89911246A EP89911246A EP0440682B1 EP 0440682 B1 EP0440682 B1 EP 0440682B1 EP 89911246 A EP89911246 A EP 89911246A EP 89911246 A EP89911246 A EP 89911246A EP 0440682 B1 EP0440682 B1 EP 0440682B1
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EP
European Patent Office
Prior art keywords
string
racket
rivet sleeve
thickening
edge
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EP89911246A
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German (de)
French (fr)
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EP0440682A1 (en
Inventor
Hans-Werner Korte-Jungermann
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Individual
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Individual
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Priority to AT89911246T priority Critical patent/ATE91640T1/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
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/14—Arrangements for stringing, e.g. for controlling the tension of the strings during stringing
    • 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
    • A63B49/025—Means on frames for clamping string ends
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/14—Arrangements for stringing, e.g. for controlling the tension of the strings during stringing
    • A63B51/143—Hand-held string-tensioning devices

Definitions

  • the invention relates to a method for stringing rackets for ball games, in particular tennis games, with single strings, in which a string is then passed from outside through a hole in the racket edge, possibly above or below strings already clamped, and from the inside of the racket through the opposite hole and a first rivet sleeve fixedly attached to one of the outwardly projecting ends of the string is drawn into the bore from the outside of the racket, so that the head of the first rivet sleeve locks this end of the string, and then on the opposite side projecting area of the string an outward tension is applied, the size of which may be displayed, and then a second rivet sleeve pushed onto the area beyond the outer edge of the string protruding prior to applying the tension is firmly connected to the string, and then the Zu The tension is reduced so that the second rivet sleeve is drawn into the facing bore of the racket by the remaining tension, and then the end of the string projecting over the rivet head of this rivet sleeve
  • the invention is based on the object of improving the method of the type mentioned at the outset in such a way that it is not necessary to draw in prefabricated individual strings, but that it is possible to use string material from non-prefabricated individual strings (i.e. from a supply reel or the like .) to move in and separate in the length required.
  • the first rivet sleeve is pushed onto the free end of the string leading to the outside and is firmly connected to the string by a clamping process and the string end protruding above the head of the first rivet sleeve is separated.
  • the method according to the invention differs from the known method, inter alia, in that the string is locked by means of the second rivet sleeve under tension from the “rear side”, that is to say on that side of the racket frame which is threaded when the string is threaded Forehead is turned away.
  • the first rivet sleeve is already firmly attached before threading the string
  • the first rivet sleeve is only attached to the front end after threading the string and the string is then locked under tension by means of the second rivet sleeve Contrary to the known method, on the "rear area" of the string during threading.
  • the method according to the invention was not obvious to the average person skilled in the art with knowledge of document EP-A-260 671, because with the known method it is imperative that the first rivet sleeve is already firmly attached to the rear end of the string to be threaded.
  • a device for stringing single-string rackets which has a contact part which can be placed on the edge of the racket and a holding part which is intended to bear against the inside edge of the racket, and a pretensioning device with a clamping device for holding the string. Furthermore, a measuring device for indicating the pre-tension reached is provided as well as a device for clamping the rivet sleeve when the string is pre-tensioned.
  • the disadvantage here is that the individual string to be tensioned, introduced from the opposite side of the racket edge, crossing the string, if any, and fastened on the opposite side of the racket edge, for applying the tension, which was effected via clamping jaws, must be passed through the tensioning head of the tensioning device.
  • This process which can be referred to as the threading process, has disadvantages in practical operation, since stringing a racket with individual strings should, among other things, enable the tennis player who has broken a string to replace this string on the spot.
  • Another object of the invention is to improve the above-mentioned method in such a way that easier operation is possible. This is achieved by the process steps specified in claims 2 and 3. Because the tension is now applied to a thickening of the single string, the laborious threading of the string required by the previous method is unnecessary, since the tension can be attached to the thickening by engaging a claw or the like. The thickening is therefore not clamped, but is loosely stored in the claw element. When the tension is applied, the individual string is not damaged by clamping elements, and the individual string can turn due to the initially loose contact in the claw before the tension is applied. Preferably, a single string is inserted without thickening and then locked on a racket edge.
  • a device for performing the method is characterized by the features contained in claim 3.
  • the advantage here is that the thickening of the single string to which the tension is to be applied can be detected with the claw of the tensioning device, and that the tensioning device can then be placed on the racket frame, the stop abutting against the outer edge of the racket. Then the clamping device is locked by means of the locking element, which can be designed, for example, as a pin. Since the claw and the locking element lie on opposite sides of the stop intended for abutment against the outer edge, a certain pretension of the string can already be achieved by detecting the thickening of the single string with the claw and by abutment against the outer edge of the racket.
  • the claw is movably arranged in a sleeve which is loosely pivotable in the tensioning lever against a biasing force.
  • the biasing force is expediently generated by a biasing spring.
  • the pre-tensioning force set in each case can be displayed by a force display device.
  • the adjusting device has a self-locking spindle gear arrangement.
  • a racket designated as a whole by 1, has in its racket head a covering with individual strings which cross each other. 1 is only denotes a single string, specifically with the reference number 2.
  • the single string 2 is shown in a position in which it is fastened on the left-hand side according to FIG. 1 in the racket edge 3 and on the opposite side by the racket edge designated there with 4 its free end 5 protrudes.
  • the end 5 has a thickening (not shown) which can be designed, for example, as a ball, clamped-on rivet sleeve or the like, such that this thickening can be detected by a claw of the tensioning device 6.
  • the claw is designated by the reference number 7 in FIG. 2 and FIG. 3.
  • the single string 2 has the aforementioned thickening at its end 5.
  • a rivet sleeve has been pushed onto the side 2 from the opposite side in such a way that the rivet head of the rivet sleeve faces the thickening.
  • the single string 2 with the side facing away from the thickening was introduced from the outside through a bore 9 in the racket edge 4 and passed over or under the strings running transversely thereto and through a bore 10 in the opposite racket edge 2.
  • a rivet sleeve was pushed onto the end projecting outward beyond the racket edge 3 according to FIG. 1 and then clamped firmly onto the single string 2 by means of a clamping device.
  • the string 2 was then tightened from the end 5, causing the rivet sleeve just attached to slide into the bore 10.
  • the bores in the edge of the racket and the rivet sleeves are matched to one another in size so that the rivet sleeve can engage in the bore while the head of the rivet sleeve bears against the edge of the bore, so that it is locked.
  • Fig. 1 shows the position in which the free end 5 of the single string 2 has now been detected with the tensioning device 6.
  • the tensioning device 6 sits on the racket edge 4.
  • a tensioning lever 12 can be pivoted in the direction of arrow A.
  • a pretensioning force is thereby applied to the single string 2.
  • the magnitude of the preload applied can be read off a scale 13.
  • the rivet sleeve (not shown in FIG. 1), which is located in the area between the thickening detected by the claw, is by means of a clamping device (not shown), which can be designed as a type of riveting pliers and the outer edge of the racket 4 is clamped.
  • the size of the tension force applied by the tensioning device 6 is chosen such that the tension force on the string in the finished state corresponds to the desired tension of the string.
  • the clamping device 6 has a stop 15 on a body 14, which is provided for bearing against the outer edge of the racket 1.
  • Flanks 16 are also present and 17 are provided, which are designed so that they can overlap the racket edge 4.
  • holes 18, 19 are provided to accommodate a locking element designed, for example, as a pin.
  • the above-mentioned tensioning lever 12 is pivotably mounted in the body 14 at 20 and can be pivoted about the pivot axis 20 via a spindle 21, which can be rotated by rotation of the handwheel 12, and a gearwheel arrangement 22.
  • the tension lever 12 has at its free end a sleeve 23 which is loosely pivotably mounted in the tension lever 12 at 24.
  • the claw 7 which serves to accommodate the thickening of the individual string to be placed under tension, is movable against the bias of a spring 24.
  • a force display device 25 is connected to the claw 7 and carries a measuring scale (not shown).
  • the user takes the tensioning device, which is not initially connected to the racket, and first detects the thickening at the free end 5 of the single string 2 by means of the claw 7. Then the user places the clamping device with the stop 15 against the outer edge of the racket edge 4. If the thickening does not protrude too far outwards, a - albeit slight - pretensioning force is already applied to the single string 2, which is sufficient, however, to prevent the thickening from being released again from the claw 7.
  • the flanks 16 and 17 are then pushed over the edge of the racket, and then the locking element is inserted into the receiving devices 18 and 19. With the associated pivoting movement of the tensioning device around the contact point of the stop 15, a further pretension is applied to the single string 2.
  • the desired tension for the string is then set on the handwheel 11. It is expedient that the value to be read on the measuring scale 25 corresponds to the tensile stress ultimately desired. This means that the value actually applied by the tensioning device must be correspondingly higher.
  • the tensile stress is then reduced until the rivet sleeve has slipped into the bore 9. The protruding end 5 is then cut off and the tensioning device is released again.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Package Frames And Binding Bands (AREA)

Abstract

A process and device for stringing rackets for ball games, in particular tennis, with single strings, are disclosed. Instead of gripping the individual string mounted on the racket and held on an edge of the racket in order to apply the required tensile force on the smooth string by means of clamping jaws, the tensile force is applied on a thickening of the string. The individual string can thus be gripped and tensioned in a more simple manner than before. An appropriate tensioning device is also disclosed.

Description

Die Erfindung betrifft ein Verfahren zur Bespannung von Schlägern für Ballspiele, insbesondere Tennisspiele, mit Einzelsaiten, bei dem eine Saite von außen durch eine Bohrung in dem Schlägerrand anschließend ggf. über bzw. unter bereits eingespannte Saiten geführt und von der Schlägerinnenseite durch die gegenüberliegende Bohrung geführt wird und eine an einem der nach außen vorstehenden Enden der Saite fest angebrachte erste Niethülse von der Schlägeraußenseite her in die Bohrung eingezogen wird, so daß der Kopf der ersten Niethülse eine Arretierung dieses Endes der Saite bewirkt, und daß dann auf den auf der gegenüberliegenden Seite vorstehenden Bereich der Saite eine nach außen weisende Zugspannung aufgebracht wird, deren Größe ggf. angezeigt wird, und daß dann durch einen Klemmvorgang eine vor Aufbringen der Zugspannung auf den über den Außenrand vorstehenden Bereich der Saite aufgeschobene zweite Niethülse fest mit der Saite verbunden wird, und dann die Zugspannung verringert wird, so daß die zweite Niethülse durch die verbleibende Spannung in die zugewandte Bohrung des Schlägers hineingezogen wird, und daß dann das über den Nietkopf dieser Niethülse vorstehende Ende der Saite abgetrennt wird.The invention relates to a method for stringing rackets for ball games, in particular tennis games, with single strings, in which a string is then passed from outside through a hole in the racket edge, possibly above or below strings already clamped, and from the inside of the racket through the opposite hole and a first rivet sleeve fixedly attached to one of the outwardly projecting ends of the string is drawn into the bore from the outside of the racket, so that the head of the first rivet sleeve locks this end of the string, and then on the opposite side projecting area of the string an outward tension is applied, the size of which may be displayed, and then a second rivet sleeve pushed onto the area beyond the outer edge of the string protruding prior to applying the tension is firmly connected to the string, and then the Zu The tension is reduced so that the second rivet sleeve is drawn into the facing bore of the racket by the remaining tension, and then the end of the string projecting over the rivet head of this rivet sleeve is separated.

Aus dem Dokument EP-A-260 671 ist ein derartiges Verfahren bekannt. Bei diesem bekannten Verfahren wird jeweils eine Saite, die an ihrem Ende eine fest angebrachte Niethülse trägt, mit ihrem keine Niethülse aufweisenden freien Ende durch das Loch des einen Randes geführt, anschließend ggf. über bzw. unter bereits eingespannte Saiten geführt und von der Schlägerinnenseite durch die gegenüberliegende Bohrung geführt. Die Arretierung der Saite mittels der zweiten Niethülse unter Zugspannung erfolgt somit an demjenigen Ende der Saite, welches bei dem Einführen der Saite "vorn" ist.Such a method is known from document EP-A-260 671. In this known method, a string carrying a fixed rivet sleeve at its end is guided with its free end not having a rivet sleeve through the hole in one edge, and then optionally passed over or under already clamped strings and led from the inside of the racket through the opposite hole. The string is then locked under tension by means of the second rivet sleeve at the end of the string which is "at the front" when the string is inserted.

Hierbei ist u.a. nachteilig, daß die bei dem bekannten Verfahren eingeführten, jeweils am Ende mit einer fest angebrachten Niethülse versehenen Saiten vorgefertigte Einzelsaiten von jeweils gleicher Länge sein müssen, da es nicht praktikabel ist, Einzelsaiten unterschiedlicher Längen in Vorrat zu halten. Man weiß nämlich nicht, ob bei einem Schläger eine "kurze" oder "lange" Einzelsaite reißt, und es muß daher für die Reparatur einer gerissenen Einzelsaite eine vorgefertigte Einzelsaite in der maximal für den Tennisschläger erforderlichen Länge verwendet werden. Nach der Anbringung der Einzelsaite wird das überstehende Ende abgetrennt. Dies führt zu einem erheblichen Verlust von Saitenmaterial.Among other things, disadvantageous that the strings introduced in the known method, each provided at the end with a firmly attached rivet sleeve, must be prefabricated individual strings of the same length, since it is not practical to keep individual strings of different lengths in stock. It is not known whether a "short" or "long" single string breaks on a racket, and therefore a prefabricated single string of the maximum length required for the tennis racket must be used to repair a broken single string. After attaching the single string, the protruding end is cut off. This leads to a considerable loss of string material.

Der Erfindung liegt zur Behebung dieses Nachteils die Aufgabe zugrunde, das Verfahren der eingangs genannten Art so zu verbessern, daß es nicht erforderlich ist, vorgefertigte Einzelsaiten einzuziehen, sondern daß es möglich ist, Saitenmaterial aus nicht vorgefertigten Einzelsaiten (also von einer Vorratsrolle od. dgl.) einzuziehen und in der jeweils individuell erforderlichen Länge abzutrennen.To overcome this disadvantage, the invention is based on the object of improving the method of the type mentioned at the outset in such a way that it is not necessary to draw in prefabricated individual strings, but that it is possible to use string material from non-prefabricated individual strings (i.e. from a supply reel or the like .) to move in and separate in the length required.

Zur Lösung dieser Aufgabe ist erfindungsgemäß vorgesehen, daß die erste Niethülse auf das nach außen geführte freie Ende der Saite aufgeschoben und diese durch einen Klemmvorgang fest mit der Saite verbunden und das ggf. über den Kopf der ersten Niethülse vorstehende Saitenende abgetrennt wird. Somit unterscheidet sich das erfindungsgemäße Verfahren von dem bekannten Verfahren u.a. dadurch, daß die Arretierung der Saite mittels der zweiten Niethülse unter Zugspannung von der "Rückseite" her erfolgt, also an derjenigen Seite des Schlägerrahmens, die bei dem Einfädeln der Saite dem eingefädelten Stirnende abgewandt ist. Während bei dem bekannten Verfahren eine Einzelsaite mit an deren rückwärtigem Ende fest angebrachte Niethülse eingefädelt wird, wird bei dem erfindungsgemäßen Verfahren eine Saite eingefädelt, die keine fest angebrachte Niethülse in dem Bereich aufweist, der dem bei dem Einfädeln die Stirnseite bildenden Ende abgewandt ist. Dies ermöglicht gegenüber dem bekannten Verfahren das Einführen einer Saite, die nicht eine vorgefertigte Länge aufweist, sondern das Einführen einer Saite von einer beliebig langen Vorratsrolle. Während bei dem bekannten Verfahren die erste Niethülse bereits vor dem Einfädeln der Saite fest angebracht ist, wird bei dem erfindungsgemäßen Verfahren die erste Niethülse erst nach dem Einfädeln der Saite an deren Stirnende angebracht und die Arretierung der Saite unter Zugspannung mittels der zweiten Niethülse erfolgt dann im Gegensatz zu dem bekannten Verfahren, an dem während des Einfädelns "rückwärtigen Bereich" der Saite. Das erfindungsgemäße Verfahren war für den Durchschnittsfachmann bei Kenntnis des Dokumentes EP-A-260 671 nicht naheliegend, denn bei dem bekannten Verfahren ist zwingend erforderlich, daß am rückwärtigen Ende der einzufädelnden Saite die erste Niethülse bereits fest angebracht ist. Da aber Saitenmaterial, welches in einer Vorratsrolle od. dgl. enthalten ist, naturgemäß keine fest angebrachte Niethülsen aufweist, schließt der Durchschnittsfachmann hieraus, daß das Verfahren zur Bespannung von Schlägern mit Einzelsaiten gemäß Dokument EP-A-260 671 nur für vorgefertigte Einzelsaiten bestimmter Länge mit an deren Ende angebrachten (ersten) Niethülsen anwendbar ist. Eine Anregung, das Aufbringen der Zugspannung und die Anbringung der "zweiten" Niethülse an - im Vergleich zum Stande der Technik - gegenüberliegenden Ende vorzusehen und außerdem ohne vorherige Aufbringung einer Zugspannung an dem "durchgefädelten" Vorderende eine Niethülse aufzustecken und zu arretieren, enthält der Stand der Technik nicht.To achieve this object it is provided according to the invention that the first rivet sleeve is pushed onto the free end of the string leading to the outside and is firmly connected to the string by a clamping process and the string end protruding above the head of the first rivet sleeve is separated. Thus, the method according to the invention differs from the known method, inter alia, in that the string is locked by means of the second rivet sleeve under tension from the “rear side”, that is to say on that side of the racket frame which is threaded when the string is threaded Forehead is turned away. While in the known method a single string is threaded with a rivet sleeve fixedly attached to its rear end, in the method according to the invention a string is threaded which does not have a fixed rivet sleeve in the region facing away from the end forming the end face during the threading. Compared to the known method, this enables the introduction of a string that does not have a prefabricated length, but rather the insertion of a string from any desired length of supply roll. While in the known method the first rivet sleeve is already firmly attached before threading the string, in the method according to the invention the first rivet sleeve is only attached to the front end after threading the string and the string is then locked under tension by means of the second rivet sleeve Contrary to the known method, on the "rear area" of the string during threading. The method according to the invention was not obvious to the average person skilled in the art with knowledge of document EP-A-260 671, because with the known method it is imperative that the first rivet sleeve is already firmly attached to the rear end of the string to be threaded. However, since string material which is contained in a supply reel or the like naturally does not have any fixed rivet sleeves, the person skilled in the art concludes from this that the method for stringing racquets with single strings according to document EP-A-260 671 only for prefabricated single strings of a certain length with (first) rivet sleeves attached to their ends. The stand contains a suggestion to provide the application of the tension and the attachment of the "second" rivet sleeve to the opposite end - compared to the prior art - and also to attach and lock a rivet sleeve to the "threaded" front end without prior application of tension of technology not.

Au dem Dokument EP-A-260 671 ist weiterhin eine Vorrichtung zur Bespannung von Schlägern mit Einzelsaiten bekannt, welche ein auf den Schlägerrand aufsetzbares Anlageteil und ein zur Anlage gegen den Schlägerinnenrand vorgesehenes Halteteil aufweist sowie eine Vorspanneinrichtung mit einer Klemmeinrichtung zum Festhalten der Saite. Weiterhin ist eine Meßeinrichtung zur Anzeige der erreichten Vorspannung vorgesehen sowie eine Vorrichtung zum Festklemmen der Niethülse bei vorgespannter Saite.From document EP-A-260 671 a device for stringing single-string rackets is also known, which has a contact part which can be placed on the edge of the racket and a holding part which is intended to bear against the inside edge of the racket, and a pretensioning device with a clamping device for holding the string. Furthermore, a measuring device for indicating the pre-tension reached is provided as well as a device for clamping the rivet sleeve when the string is pre-tensioned.

Hierbei ist von Nachteil, daß die zu spannende, von der gegenüberliegenden Seite des Schlägerrandes unter Kreuzung der ggf. vorhandenen Saite eingeführte und auf der gegenüberliegenden Schlägerrandseite befestigte Einzelsaite zum Aufbringen der Zugspannung, welche über Klemmbacken erfolgte, durch den Spannkopf der Spanneinrichtung hindurchgeführt werden muß. Dieser Vorgang, welcher als Einfädelvorgang bezeichnet werden kann, weist im praktischen Betrieb Nachteile auf, denn die Bespannung eines Schlägers mit Einzelsaiten soll es unter anderem ermöglichen, daß der Tennisspieler, dem eine Saite gerissen ist, diese Saite an Ort und Stelle erneuern kann.The disadvantage here is that the individual string to be tensioned, introduced from the opposite side of the racket edge, crossing the string, if any, and fastened on the opposite side of the racket edge, for applying the tension, which was effected via clamping jaws, must be passed through the tensioning head of the tensioning device. This process, which can be referred to as the threading process, has disadvantages in practical operation, since stringing a racket with individual strings should, among other things, enable the tennis player who has broken a string to replace this string on the spot.

Eine weitere Aufgabe der Erfindung besteht darin, das eingangs genannte Verfahren so zu verbessern, daß eine einfachere Bedienung möglich ist. Dies wird durch die in den Patentansprüchen 2 und 3 angegebenen Verfahrensschritte erreicht. Dadurch, daß die Zugspannung nunmehr auf eine Verdickung der Einzelsaite aufgebracht wird, erübrigt sich das nach dem bisherigen Verfahren erforderliche mühsame Einfädeln der Saite, da die Zugspannung durch Angreifen einer Klaue od. dgl. an der Verdickung angebracht werden kann. Die Verdickung wird also nicht geklemmt, sondern lose in dem Klauenelement gelagert. Bei Aufbringen der Zugspannung erfolgt keine Beschädigung der Einzelsaite durch Klemmelemente und die Einzelsaite kann sich durch die zunächst lose Anlage in der Klaue vor Aufbringen der Zugspannung drehen. Vorzugsweise wird eine Einzelsaite ohne Verdickung eingeführt und dann eine Arretierung an einem Schlägerrand vorgenommen. Auf das an der dann gegenüberliegenden Seite nach außen stehende freie Ende wird dann zunächst die zweite Niethülse aufgeschoben und anschließend eine Verdickung aufgebracht, beispielsweise durch Aufklemmen eines entsprechenden Elementes. Dieses aufgeklemmte Element kann dann ebenfalls mit einer gabelartigen Klaue zum Aufbringen der Zugspannung erfaßt werden.Another object of the invention is to improve the above-mentioned method in such a way that easier operation is possible. This is achieved by the process steps specified in claims 2 and 3. Because the tension is now applied to a thickening of the single string, the laborious threading of the string required by the previous method is unnecessary, since the tension can be attached to the thickening by engaging a claw or the like. The thickening is therefore not clamped, but is loosely stored in the claw element. When the tension is applied, the individual string is not damaged by clamping elements, and the individual string can turn due to the initially loose contact in the claw before the tension is applied. Preferably, a single string is inserted without thickening and then locked on a racket edge. On the side on the opposite side free end is then first pushed on the second rivet sleeve and then applied a thickening, for example by clamping a corresponding element. This clamped element can then also be gripped with a fork-like claw for applying the tension.

Eine Vorrichtung zur Durchführung des Verfahrens ist durch die im Patentanspruch 3 enthaltenen Merkmale gekennzeichnet. Hierbei ist von Vorteil, daß die Verdickung der Einzelsaite, auf welche die Zugspannung aufgebracht werden soll, mit der Klaue der Spannvorrichtung erfaßt werden kann, und daß dann die Spannvorrichtung auf den Schlägerrahmen aufgesetzt werden kann, wobei der Anschlag gegen den Außenrand des Schlägers anliegt. Dann erfolgt eine Arretierung der Spannvorrichtung mittels des Arretierelementes, welches beispielsweise als Stift ausgebildet sein kann. Da die Klaue und das Arretierelement auf jeweils gegenüberliegenden Seiten des zur Anlage gegen den Außenrand vorgesehenen Anschlages liegen, kann man durch Erfassen der Verdickung der Einzelsaite mit der Klaue und durch Anlage des Anschlages gegen den Außenrand des Schlägers bereits eine gewisse Vorspannung der Saite erreichen. Der Benutzer kann dann die Spannvorrichtung entgegen der Kraft dieser erreichten Vorspannung verschwenken, und zwar soweit, bis die Aufnahmeeinrichtungen zur Aufnahme des Arretierelementes auf der Innenseite des Schlägerrandes liegen, so daß dann das Arretierelement - beispielsweise der Stift - durchgesteckt werden kann. Damit ist dann eine weitere Vorspannung auf die Einzelsaite aufgebracht worden. Für die praktische Benutzung hat dies den wesentlichen Vorteil, daß dem Benutzer die zu spannendeA device for performing the method is characterized by the features contained in claim 3. The advantage here is that the thickening of the single string to which the tension is to be applied can be detected with the claw of the tensioning device, and that the tensioning device can then be placed on the racket frame, the stop abutting against the outer edge of the racket. Then the clamping device is locked by means of the locking element, which can be designed, for example, as a pin. Since the claw and the locking element lie on opposite sides of the stop intended for abutment against the outer edge, a certain pretension of the string can already be achieved by detecting the thickening of the single string with the claw and by abutment against the outer edge of the racket. The user can then pivot the tensioning device against the force of this pre-tensioning, until the receiving devices for receiving the locking element lie on the inside of the racket edge, so that the locking element - for example the pin - can then be inserted. A further pretension was then applied to the single string. For practical use, this has the essential advantage that the user is too excited

Saite während der Befestigung der Spannvorrichtung an dem Schlägerrand nicht herausrutscht.String does not slip out while attaching the tensioner to the racket edge.

In vorteilhafter Ausgestaltung der Erfindung ist vorgesehen, daß die Klaue in einer lose verschwenkbar in dem Spannhebel gelagerten Hülse entgegen einer Vorspannkraft beweglich angeordnet ist. Dies hat den Vorteil, daß sich die Klaue entsprechend dem bei der Anbringung der Spanneinrichtung und der Verstellung der Vorspannkraft verändernden Neigungswinkel anpassen kann. Die Vorspannkraft wird zweckmäßigerweise durch eine Vorspannfeder erzeugt. Die jeweils eingestellte Vorspannkraft kann durch eine Kraftanzeigeeinrichtung angezeigt werden.In an advantageous embodiment of the invention it is provided that the claw is movably arranged in a sleeve which is loosely pivotable in the tensioning lever against a biasing force. This has the advantage that the claw can adapt in accordance with the angle of inclination which changes when the tensioning device is attached and the prestressing force is adjusted. The biasing force is expediently generated by a biasing spring. The pre-tensioning force set in each case can be displayed by a force display device.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß die Verstelleinrichtung eine selbsthemmende Spindel-Zahnradanordnung aufweist.In a further embodiment of the invention it is provided that the adjusting device has a self-locking spindle gear arrangement.

Die Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. Es zeigen:

Fig. 1
eine Draufsicht auf einen Schläger mit einer Anzahl eingespannter Einzelsaiten und der Spannvorrichtung;
Fig. 2
eine teilweise Schnittdarstellung durch die Spannvorrichtung in vergrößertem Maßstab;
Fig. 3
eine Schnittdarstellung durch die in dem Spannhebel der Spannvorrichtung lose verschwenkbar gelagerte Hülse.
The invention is explained below with reference to the drawing. Show it:
Fig. 1
a plan view of a racket with a number of clamped individual strings and the tensioning device;
Fig. 2
a partial sectional view through the clamping device on an enlarged scale;
Fig. 3
a sectional view through the sleeve loosely pivoted in the clamping lever of the clamping device.

Ein insgesamt mit 1 bezeichneter Schläger weist in seinem Schlägerkopf eine Bespannung mit sich jeweils kreuzend angeordneten Einzelsaiten auf. In Fig. 1 ist lediglich eine Einzelsaite bezeichnet, und zwar mit der Bezugsziffer 2. Die Einzelsaite 2 ist in einer Lage dargestellt, in der sie auf der entsprechend Fig. 1 linken Seite in dem Schlägerrand 3 befestigt ist und auf der gegenüberliegenden Seite durch den dort mit 4 bezeichneten Schlägerrand mit ihrem freien Ende 5 herausragt. Das Ende 5 weist eine (nicht dargestellte) Verdickung auf, die beispielsweise als Kugel, aufgeklemmte Niethülse od. dgl. ausgebildet sein kenn, derart, daß diese Verdickung durch eine Klaue der Spanneinrichtung 6 erfaßt werden kann. Die Klaue ist in Fig. 2 und Fig. 3 mit der Bezugsziffer 7 bezeichnet.A racket, designated as a whole by 1, has in its racket head a covering with individual strings which cross each other. 1 is only denotes a single string, specifically with the reference number 2. The single string 2 is shown in a position in which it is fastened on the left-hand side according to FIG. 1 in the racket edge 3 and on the opposite side by the racket edge designated there with 4 its free end 5 protrudes. The end 5 has a thickening (not shown) which can be designed, for example, as a ball, clamped-on rivet sleeve or the like, such that this thickening can be detected by a claw of the tensioning device 6. The claw is designated by the reference number 7 in FIG. 2 and FIG. 3.

Bevor die Einzelsaite 2 in Fig. 1 die dort dargestellte Lage erreicht hat, sind folgende Verfahrensschritte vorhergegangen:Before the individual string 2 in FIG. 1 has reached the position shown there, the following process steps have preceded:

Die Einzelsaite 2 weist an ihrem Ende 5 die erwähnte Verdickung auf. Vor dem Einführen der Einzelsaite in den Schläger ist von der gegenüberliegenden Seite her eine Niethülse auf die Seite 2 so aufgeschoben worden, daß der Nietkopf der Niethülse der Verdickung zugewandt ist. Dann wurde die Einzelsaite 2 mit der der Verdickung abgewandten Seite durch eine Bohrung 9 im Schlägerrand 4 von außen her eingeführt und über bzw. unter den quer dazu verlaufenden Saiten hindurchgeführt und durch eine Bohrung 10 in den gegenüberliegenden Schlägerrand 2 durchgeführt. Auf das dann entsprechend Fig. 1 über den Schlägerrand 3 nach außen vorstehende Ende wurde eine Niethülse aufgeschoben und diese dann mittels einer Klemmeinrichtung fest auf die Einzelsaite 2 aufgeklemmt. Anschließend wurde die Saite 2 von dem Ende 5 her angezogen, wodurch die soeben befestigte Niethülse in die Bohrung 10 hineinrutschte. Die Bohrungen im Schlägerrand und die Niethülsen sind in ihrer Größe so aufeinander abgestimmt, daß die Niethülse in die Bohrung einfassen kann, während sich der Kopf der Niethülse gegen den Rand der Bohrung anlegt, so daß dadurch eine Arretierung erfolgt.The single string 2 has the aforementioned thickening at its end 5. Before inserting the single string into the racket, a rivet sleeve has been pushed onto the side 2 from the opposite side in such a way that the rivet head of the rivet sleeve faces the thickening. Then the single string 2 with the side facing away from the thickening was introduced from the outside through a bore 9 in the racket edge 4 and passed over or under the strings running transversely thereto and through a bore 10 in the opposite racket edge 2. A rivet sleeve was pushed onto the end projecting outward beyond the racket edge 3 according to FIG. 1 and then clamped firmly onto the single string 2 by means of a clamping device. The string 2 was then tightened from the end 5, causing the rivet sleeve just attached to slide into the bore 10. The bores in the edge of the racket and the rivet sleeves are matched to one another in size so that the rivet sleeve can engage in the bore while the head of the rivet sleeve bears against the edge of the bore, so that it is locked.

Anschließend wurde das ggf. Über den Nietkopf vorstehende Ende der Einzelsaite 2 abgetrennt.Subsequently, the end of the single string 2, possibly protruding from the rivet head, was cut off.

Fig. 1 zeigt die Lage, in der das freie Ende 5 der Einzelsaite 2 nunmehr mit der Spannvorrichtung 6 erfaßt wurde. Die Spannvorrichtung 6 sitzt auf dem Schlägerrand 4. Durch Drehen eines Handrades 11 kann ein Spannhebel 12 in Pfeilrichtung A verschwenkt werden. Wie ohne weiteres ersichtlich, wird dadurch auf die Einzelsaite 2 eine Vorspannkraft aufgebracht. Die Größe der aufgebrachten Vorspannkraft kann an einer Skala 13 abgelesen werden. Wenn die aufgebrachte Vorspannkraft die gewünschte Größe erreicht hat, wird mittels einer (nicht dargestellten) Klemmvorrichtung, welche als Art Nietzange ausgebildet sein kann, die (in Fig. 1 nicht dargestellte) Niethülse, die sich in dem Bereich zwischen der von der Klaue erfaßten Verdickung und dem Schlägeraußenrand 4 befindet, festgeklemmt. Dann wird die Vorspannung durch Drehung des Handrades 11 und das damit verbundene Verschwenken des Spannhebels 12 entgegen der Pfeilrichtung A verringert, und zwar so lange, bis durch die noch vorhandene Spannkraft die gerade festgeklemmte Niethülse in die Bohrung 9 hineingezogen wurde, bis der Nietkopf dieser Niethülse gegen den Rand der Bohrung 9 anliegt. Dann ist es lediglich noch erforderlich, das Über den Nietkopf vorstehende, die Verdickung aufweisende Ende 5 der Einzelsaite 2 abzutrennen.Fig. 1 shows the position in which the free end 5 of the single string 2 has now been detected with the tensioning device 6. The tensioning device 6 sits on the racket edge 4. By turning a handwheel 11, a tensioning lever 12 can be pivoted in the direction of arrow A. As can be easily seen, a pretensioning force is thereby applied to the single string 2. The magnitude of the preload applied can be read off a scale 13. When the applied prestressing force has reached the desired size, the rivet sleeve (not shown in FIG. 1), which is located in the area between the thickening detected by the claw, is by means of a clamping device (not shown), which can be designed as a type of riveting pliers and the outer edge of the racket 4 is clamped. Then the pretension is reduced by rotating the handwheel 11 and the associated pivoting of the tensioning lever 12 against the direction of arrow A, until the rivet sleeve which has just been clamped has been pulled into the bore 9 by the still existing tensioning force until the rivet head of this rivet sleeve bears against the edge of the bore 9. Then it is only necessary to separate the end 5 of the individual string 2 which projects above the rivet head and has the thickening.

Die durch die Spannvorrichtung 6 aufgebrachte Zugkraft wird in ihrer Größe so gewählt, daß die in fertigem Zustand auf der Saite befindliche Spannkraft der gewünschte Saitenspannung entspricht.The size of the tension force applied by the tensioning device 6 is chosen such that the tension force on the string in the finished state corresponds to the desired tension of the string.

Die Spanneinrichtung 6 weist an einem Körper 14 einen Anschlag 15 auf, der zur Anlage gegen den Außenrand des Schlägers 1 vorgesehen ist. Weiterhin sind Flanken 16 und 17 vorgesehen, die so ausgebildet sind, daß sie den Schlägerrand 4 Übergreifen können. In den Flanken 16 und 17 sind als Löcher 18, 19 ausgebildete Aufnahmeeinrichtungen zur Aufnahme eines beispielsweise als Stift gestalteten Arretierelementes vorgesehen. Somit kann die Spannvorrichtung in einfacher Weise von außen so auf den Schlägerrand aufgesetzt werden, daß der Anschlag 15 gegen den Außenrand anliegt und das Arretierelement die Aufnahmeeinrichtungen 18 und 19 durchfaßt und dann das Arretierelement gegen den Innenrand anliegt.The clamping device 6 has a stop 15 on a body 14, which is provided for bearing against the outer edge of the racket 1. Flanks 16 are also present and 17 are provided, which are designed so that they can overlap the racket edge 4. In the flanks 16 and 17, holes 18, 19 are provided to accommodate a locking element designed, for example, as a pin. Thus, the clamping device can be placed in a simple manner from the outside on the edge of the racket so that the stop 15 bears against the outer edge and the locking element passes through the receiving devices 18 and 19 and then the locking element bears against the inner edge.

Der bereits erwähnte Spannhebel 12 ist bei 20 verschwenkbar in dem Körper 14 gelagert und Über eine Spindel 21, welche durch Drehung des Handrades 12 drehbar ist, und eine Zahnradanordnung 22 um die Schwenkachse 20 verschwenkbar. Der Spannhebel 12 weist an seinem freien Ende eine Hülse 23 auf, die in dem Spannhebel 12 bei 24 lose verschwenkbar gelagert ist. In der Hülse 23 ist die Klaue 7, die zur Aufnahme der Verdickung der unter Zugspannung zu setzenden Einzelsaite dient, entgegen der Vorspannung einer Feder 24 beweglich. Mit der Klaue 7 ist eine Kraftanzeigeeinrichtung 25 verbunden, die eine (nicht dargestellte) Meßskala trägt.The above-mentioned tensioning lever 12 is pivotably mounted in the body 14 at 20 and can be pivoted about the pivot axis 20 via a spindle 21, which can be rotated by rotation of the handwheel 12, and a gearwheel arrangement 22. The tension lever 12 has at its free end a sleeve 23 which is loosely pivotably mounted in the tension lever 12 at 24. In the sleeve 23, the claw 7, which serves to accommodate the thickening of the individual string to be placed under tension, is movable against the bias of a spring 24. A force display device 25 is connected to the claw 7 and carries a measuring scale (not shown).

Wenn die Einzelsaite 2 die in Fig. 1 dargestellte Position erreicht hat (in der sie noch nicht von der Spannvorrichtung erfaßt ist) nimmt der Benutzer die zunächst nicht mit dem Schläger verbundene Spannvorrichtung an sich und erfaßt zunächst die Verdickung an dem freien Ende 5 der Einzelsaite 2 mittels der Klaue 7. Dann legt der Benutzer die Spanneinrichtung mit dem Anschlag 15 gegen den Außenrand des Schlägerrandes 4 an. Wenn die Verdickung nicht allzu weit nach außen vorsteht, wird dadurch schon eine - wenn auch geringe - Vorspannkraft auf die Einzelsaite 2 aufgebracht, die jedoch ausreicht, es zu verhindern, daß sich die Verdickung wieder aus der Klaue 7 löst.When the single string 2 has reached the position shown in FIG. 1 (in which it has not yet been gripped by the tensioning device), the user takes the tensioning device, which is not initially connected to the racket, and first detects the thickening at the free end 5 of the single string 2 by means of the claw 7. Then the user places the clamping device with the stop 15 against the outer edge of the racket edge 4. If the thickening does not protrude too far outwards, a - albeit slight - pretensioning force is already applied to the single string 2, which is sufficient, however, to prevent the thickening from being released again from the claw 7.

Anschließend werden die Flanken 16 und 17 über den Schlägerrand geschoben, und dann erfolgt ein Einstecken des Arretierelementes in die Aufnahmeeinrichtungen 18 und 19. Bei der damit verbundenen Verschwenkbewegung der Spanneinrichtung um die Anlagestelle des Anschlages 15 wird eine weitere Vorspannung auf die Einzelsaite 2 aufgebracht. Anschließend wird dann an dem Handrad 11 die gewünschte Zugspannung für die Saite eingestellt. Zweckmäßigerweise ist es so, daß der an der Meßskala 25 abzulesende Wert der letztlich gewünschten Zugspannung entspricht. Dies bedingt, daß der tatsächlich von der Spanneinrichtung aufgebrachte Wert entsprechend höher sein muß. Nach dem Verklemmen der lose zwischen dem Schlägeraußenrand und der Verdickung auf dem freien Ende 5 sitzenden Niethülse wird dann die Zugspannung verringert, bis die Niethülse in die Bohrung 9 hineingerutscht ist. Das vorstehende Ende 5 wird dann abgetrennt und die Spannvorrichtung wieder gelöst.The flanks 16 and 17 are then pushed over the edge of the racket, and then the locking element is inserted into the receiving devices 18 and 19. With the associated pivoting movement of the tensioning device around the contact point of the stop 15, a further pretension is applied to the single string 2. The desired tension for the string is then set on the handwheel 11. It is expedient that the value to be read on the measuring scale 25 corresponds to the tensile stress ultimately desired. This means that the value actually applied by the tensioning device must be correspondingly higher. After the rivet sleeve which is loosely seated between the outer edge of the racket and the thickening on the free end 5, the tensile stress is then reduced until the rivet sleeve has slipped into the bore 9. The protruding end 5 is then cut off and the tensioning device is released again.

Claims (8)

  1. A process for stringing rackets for ball games, in particular tennis, with individual strings, in which a string is passed from the outside through a bore in the edge of the racket, then possibly over and under strings which have already been strung, and passed from the inside of the racket through the oppositely disposed bore, and a first rivet sleeve which is fixedly disposed on one of the outwardly projecting ends of the string is drawn from the outside of the racket into the bore so that the head of the first rivet sleeve provides for arresting of that end, and that then an outwardly directed tensile force, the magnitude of which is possibly indicated, is applied to the region of the string which projects on the opposite side, and then a loose second rivet sleeve which is pushed on to the region of the string projecting beyond the outside edge prior to application of the tensile force, is fixedly connected to the string by a clamping operation and then the tensile force is reduced so that the second rivet sleeve is pulled into the bore facing same in the racket by the remaining tension and that then the end of the string which projects beyond the rivet head of said rivet sleeve is cut off, characterised in that the first rivet sleeve is pushed on to the outwardly passed free end of the string and the rivet sleeve is fixedly connected to the string by a clamping operation and the end of the string which possibly projects beyond the head of the first rivet sleeve is cut off.
  2. A process according to claim 1 characterised in that the tensile force is applied to a thickening on the region of the string which projects outwardly.
  3. A process according to claim 2 characterised in that during the operation of introducing the individual string the individual string does not initially have a thickening and that after the string is arrested at the oppositely disposed edge of the racket the loose second rivet sleeve is firstly fitted on to the free end which still projects outwardly and that a thickening is then applied to the free end, for example by clamping a suitable element thereon.
  4. A device for carrying out the process according to one of claims 1 to 3 characterised in that a tensioning device (6) is provided for applying the tensile force to the thickening on the individual string (2) and the tensioning device has a body (14) with flanks (16, 17) which project beyond an abutment (15) provided to bear against the outside edge (4) of the racket and which are provided for engaging on both sides over the edge of the racket into the inside region of the racket, the flanks (16, 17) having receiving means (18, 19) disposed at a spacing from the abutment for receiving an arresting element provided for connection in the inside region of the racket, and that the tensioning device (6) has a tensioning lever (12) which is pivotable in the plane of the racket and which is displaceable by way of an adjusting device and which is arranged remote from the receiving means for the arresting element and on which is arranged a claw (7) for receiving the thickening of the individual string (2) which is to be tensioned.
  5. A device according to claim 4 characterised in that the claw (7) is arranged movably against a prestressing force in a sleeve (23) which is loosely pivotably mounted in the tensioning lever (12).
  6. A device according to claim 5 characterised in that a prestressing spring (24) is provided for producing the prestressing force.
  7. A device according to claim 5 or claim 6 characterised in that a force indicator device (21) is provided for indicating the set tensioning force.
  8. A device according to one of claims 4 to 7 characterised in that the adjusting device has a self-locking spindle-gear assembly (21, 22).
EP89911246A 1988-10-15 1989-10-16 Process and device for stringing rackets for ball games Expired - Lifetime EP0440682B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89911246T ATE91640T1 (en) 1988-10-15 1989-10-16 METHOD FOR STRINGING RACKETS FOR BALL GAME AND DEVICE FOR CARRYING OUT THE METHOD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3835192 1988-10-15
DE3835192A DE3835192A1 (en) 1988-10-15 1988-10-15 METHOD FOR STRETCHING RACKETS FOR BALL GAMES AND DEVICE FOR IMPLEMENTING THE METHOD

Publications (2)

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EP0440682A1 EP0440682A1 (en) 1991-08-14
EP0440682B1 true EP0440682B1 (en) 1993-07-21

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US (1) US5186459A (en)
EP (1) EP0440682B1 (en)
JP (1) JPH04501072A (en)
AU (1) AU628413B2 (en)
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WO (1) WO1990003829A1 (en)

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US4484742A (en) * 1982-11-22 1984-11-27 Mccrone James G Stringing tool for tennis rackets and the like
US4491322A (en) * 1983-07-11 1985-01-01 Heilman Karl J Tensioning apparatus for a racket-stringing machine
DE3506025A1 (en) * 1985-02-21 1986-08-21 Peter 6109 Mühltal Buschbeck Tennis racquet
DE8624960U1 (en) * 1986-09-18 1987-08-20 Korte-Jungermann, Hans-Werner, 4156 Willich, De

Also Published As

Publication number Publication date
JPH04501072A (en) 1992-02-27
DE3835192A1 (en) 1990-04-19
EP0440682A1 (en) 1991-08-14
AU4428089A (en) 1990-05-01
DE58904988D1 (en) 1993-08-26
WO1990003829A1 (en) 1990-04-19
AU628413B2 (en) 1992-09-17
US5186459A (en) 1993-02-16

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