WO2004064929A2 - Synthetic strings for racket and method for making same - Google Patents

Synthetic strings for racket and method for making same Download PDF

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Publication number
WO2004064929A2
WO2004064929A2 PCT/FR2004/050014 FR2004050014W WO2004064929A2 WO 2004064929 A2 WO2004064929 A2 WO 2004064929A2 FR 2004050014 W FR2004050014 W FR 2004050014W WO 2004064929 A2 WO2004064929 A2 WO 2004064929A2
Authority
WO
WIPO (PCT)
Prior art keywords
rope
synthetic
string
strings
racket
Prior art date
Application number
PCT/FR2004/050014
Other languages
French (fr)
Other versions
WO2004064929A3 (en
Inventor
Yves Delvael
Original Assignee
Cousin Composites
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cousin Composites filed Critical Cousin Composites
Priority to US10/542,476 priority Critical patent/US20060182959A1/en
Priority to EP04701985A priority patent/EP1583591A2/en
Publication of WO2004064929A2 publication Critical patent/WO2004064929A2/en
Publication of WO2004064929A3 publication Critical patent/WO2004064929A3/en

Links

Classifications

    • 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
    • A63B51/02—Strings; String substitutes; Products applied on strings, e.g. for protection against humidity or wear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
    • B29C59/043—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts for profiled articles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber

Definitions

  • the present invention relates to a composite synthetic rope, intended in particular, but not exclusively, for the stringing of tennis rackets or other similar ball game such as squash or badminton and a method and a device for providing flexibility rope to allow easier racket stringing.
  • Composite synthetic strings are already known.
  • FR-A-2 491 098 a synthetic cord with two components is described: multifilament yarns of polyamide and polyurethane, the multifilaments being integrated in a polyurethane matrix.
  • the polyurethane binder whose elastic behavior is much higher than that of polyamide, makes it possible to obtain, with a particular structure of the rope, a high breaking strength and a medium hardness resulting in a rapid return of the rope in its initial position after the impact of a bullet.
  • the present invention relates to a tennis rope or the like, composite or single filament, allowing easy stringing, although with an equivalent lifespan, and having better grip of the ball on the sieve during impact as well that a characteristic new aspect.
  • the synthetic cord in particular for tennis rackets, is characterized in that it has a series of bowls distributed in a determined pitch.
  • the manufacturing process is characterized in that, after its constitution, the rope is subjected sequentially to pressures according to a determined pitch.
  • This pressure can be exerted on only one side of the rope or on several sides of the latter in the long axis thereof or in a helix.
  • the bowls are diametrically opposite one another.
  • the invention also relates to a device allowing the implementation of the method.
  • the rope is routed between two pairs of wheels one of which is toothed so that the rope is hammered successively on one side and then on the opposite side.
  • Figure 2 a view of a device for implementing the method comprising two pairs of wheels.
  • the rope section 2 has on its two faces of the cups 1 resulting from the pressure exerted by the teeth of toothed wheels.
  • the height of said bowls is of the order of five hundredths of a mm for a cord whose diameter is 1.4 millimeters.
  • the pitch of the bowls is, for example, four millimeters.
  • These cups 1 are preferably formed between two wheels, one of which has a guide groove and the other of which is provided with teeth. Such a device is shown diagrammatically in FIG. 2.
  • the rope 2 is stretched between two return pulleys 3 and 4.
  • the idler pulleys 3 and 4 are arranged on either side of two pairs of wheels 5,6 and 7,8 respectively, each wheel of a pair turning in opposite direction of the other wheel.
  • the toothed wheel 5 rotates in the sinistrorsum direction
  • the grooved wheel 6 rotates in the dextrorsum direction.
  • the same goes for the second pair.
  • the cups are formed by a peripheral contact of the teeth 9 with the upper part of the cord 2.
  • the speed of travel of the cord can vary, for example from 60 to 200 meters per minute. In fact, this speed is only limited by the printing speed when The hammering operation is carried out in combination with a print head.
  • the wheels are simply driven by the passage of wire 2. However, they can be provided with an autonomous motorized drive. Furthermore, a jack (not shown) exerts the necessary pressure between the pairs of wheels.
  • the rope shown in Figure 1 is a TECNIFIBRE® rope of the 625 TGV type, with a diameter of 1.40mm and has a breaking strength greater than 80 daNs. Its elongation at break is of the order of 25, and its mass is 1.87 grams per meter, and eleven polyamide 6.6 multifilament yarns, each including 140 filaments with a diameter of 28 microns coated at the core with polyurethane. All of the wires are twisted at the rate of 80 turns / meter. The bowls are spaced four millimeters apart and their depth is five hundredths of a millimeter.

Abstract

The invention concerns a synthetic string in particular for tennis racket. The invention is characterized in that the string, after its production, is hammered at regular intervals thereby causing surface dimples (1) to be formed. The invention facilitates stringing, provides a novel appearance and better grip of the ball on the strings.

Description

CORDE SYNTHÉTIQUE POUR RAQUETTE .ET SON PROCÉDÉ DE SYNTHETIC ROPE FOR RACQUET. AND METHOD FOR
FABRICATIONMANUFACTURING
La présente invention a pour objet une corde synthétique composite, destinée en particulier, mais non exclusivement, au cordage de raquettes de tennis ou autre jeu de balle analogue tel que le squash ou le badminton et un procédé et un dispositif permettant de donner de la souplesse à la corde pour permettre un cordage plus facile des raquettes.The present invention relates to a composite synthetic rope, intended in particular, but not exclusively, for the stringing of tennis rackets or other similar ball game such as squash or badminton and a method and a device for providing flexibility rope to allow easier racket stringing.
On connaît déjà des cordes synthétiques composites. Dans FR-A-2 491 098, est décrite une corde synthétique à deux composants : des fils multifilaments de polyamide et du polyuréthane, les multifilaments étant intégrés dans une matrice de polyuréthane. Le liant de polyuréthane, dont le comportement élastique est très supérieur à celui du polyamide, permet d'obtenir avec une structure particulière de la corde, une résistance à la rupture élevée et une dureté moyenne se traduisant par un retour • rapide de la corde dans sa position initiale après l'impact d'une balle.Composite synthetic strings are already known. In FR-A-2 491 098, a synthetic cord with two components is described: multifilament yarns of polyamide and polyurethane, the multifilaments being integrated in a polyurethane matrix. The polyurethane binder, whose elastic behavior is much higher than that of polyamide, makes it possible to obtain, with a particular structure of the rope, a high breaking strength and a medium hardness resulting in a rapid return of the rope in its initial position after the impact of a bullet.
On connaît également des cordes de tennis mono filament extrudées en polyester et/ou en polyetherether présentant une durée de vie supérieure à celle des cordes citées ci- dessus mais avec des caractéristiques en jeu inférieures. Ces cordes en raison de leur rigidité sont très difficiles à corder de sorte que cett ' opération nécessite un temps plus important qu'avec l'une des cordes citées précédemment. La présenta invention a pour objet une corde de tennis ou analogue, composite ou mono filament, permettant un cordage aisé, bien qu'avec une durée de vie équivalante, et présentant une meilleure accroche de la balle sur le tamis lors de l'impact ainsi qu'un aspect nouveau caractéristique.Also known are monofilament tennis strings extruded in polyester and / or polyetherether having a longer lifespan than the strings mentioned above but with lower playing characteristics. These strings due to their rigidity are very difficult to string so that this operation requires more time than with one of the strings mentioned above. The present invention relates to a tennis rope or the like, composite or single filament, allowing easy stringing, although with an equivalent lifespan, and having better grip of the ball on the sieve during impact as well that a characteristic new aspect.
Selon la présente invention, la corde synthétique, notamment pour raquette de tennis, est caractérisée en ce qu'elle présente une série de cuvettes réparties selon un pas déterminé.According to the present invention, the synthetic cord, in particular for tennis rackets, is characterized in that it has a series of bowls distributed in a determined pitch.
Le procédé de fabrication est caractérisé en ce que, après sa constitution, la corde est soumise séquentiellement à des pressions selon un pas déterminé.The manufacturing process is characterized in that, after its constitution, the rope is subjected sequentially to pressures according to a determined pitch.
Cette pression peut s'exercer sur un seul coté de la corde ou sur plusieurs côtés de celle-ci dans l'axe long de celle-ci ou en hélice.This pressure can be exerted on only one side of the rope or on several sides of the latter in the long axis thereof or in a helix.
Selon une autre caractéristique de l'invention, les cuvettes sont diamétralement opposées l'une à l'autre.According to another characteristic of the invention, the bowls are diametrically opposite one another.
Cette opération produit localement une sorte d'écrouissage qui donne à la corde la souplesse désirée et un aspect nouveau. Dans le cas d'une corde polyester mono filament ou analogue, cette opération donne à la corde la souplesse nécessaire à un cordage aisé. En effet, la pression conduit à une désorganisation locale du réseau moléculaire ce qui se traduit par une modification du coefficient de réflexion. Dans le cas d'une corde polyamide-polyuréthane telle que celle mentionnée précédemment, comme dans le cas d'une corde polyester, on observe une meilleure accroche de la balle sur le tamis d'où des effets accentués.This operation locally produces a sort of work hardening which gives the rope the desired flexibility and a new appearance. In the case of a monofilament polyester cord or the like, this operation gives the cord the flexibility necessary for easy cording. Indeed, the pressure leads to a local disorganization of the molecular network which results in a modification of the reflection coefficient. In the case of a polyamide-polyurethane rope such as that mentioned above, as in the case of a polyester rope, a better grip of the bale on the sieve is observed, hence accentuated effects.
L'invention vise également un dispositif permettant la mise en œuvre du procédé. Dans un mode de réalisation préféré, la corde est acheminée entre deux paires de roues dont l'une est dentée de sorte que la corde est martelée successivement sur une face puis sur la face opposée.The invention also relates to a device allowing the implementation of the method. In a preferred embodiment, the rope is routed between two pairs of wheels one of which is toothed so that the rope is hammered successively on one side and then on the opposite side.
D' autres caractéristiques et avantages de i ' invention apparaîtront au cours de la description qui va suivre d'un mode particulier de réalisation, donné uniquement à titre d'exemple non limitatif, en. regard des dessins qui représentent :Other characteristics and advantages of the invention will appear during the description which follows of a particular embodiment, given solely by way of nonlimiting example, in. look at the drawings which represent:
- la figure 1, une vue d'un tronçon de corde selon l' invention.- Figure 1, a view of a section of rope according to the invention.
• la figure 2, une vue d'un dispositif de mise en œuvre du procédé comprenant deux paires de roues.• Figure 2, a view of a device for implementing the method comprising two pairs of wheels.
Sur la figure 1, on voit que le tronçon de corde 2 présente sur ses deux faces des cuvettes 1 résultant de la pression exercée par les dents de roues dentées. La hauteur desdites cuvettes est de l'ordre de cinq centièmes de mm pour une corde dont le diamètre est de 1,4 millimètre. Le pas des cuvettes est, par exemple, de quatre millimètres.In Figure 1, we see that the rope section 2 has on its two faces of the cups 1 resulting from the pressure exerted by the teeth of toothed wheels. The height of said bowls is of the order of five hundredths of a mm for a cord whose diameter is 1.4 millimeters. The pitch of the bowls is, for example, four millimeters.
Ces cuvettes 1 sont, de préférence formées entre deux roues dont 1 ' une présente une gorge de guidage et dont l'autre est munie de dents. Un tel dispositif est représenté schématiquement sur la figure 2.These cups 1 are preferably formed between two wheels, one of which has a guide groove and the other of which is provided with teeth. Such a device is shown diagrammatically in FIG. 2.
La corde 2 est tendue entre deux poulies de renvoi 3 et 4. Les poulies folles 3 et 4 sont disposées de part et d'autre de deux paires de roues respectivement 5,6 et 7,8, chaque roue d'une paire tournant en sens opposé de l'autre roue. C'est ainsi que si la roue dentée 5 tourne dans le sens sinistrorsum, la roue à gorge 6 tourne dans le sens dextrorsum. Il en va de même pour la seconde paire. Les cuvettes sont formées par un contact périphérique des dents 9 avec la partie supérieure de la corde 2. La vitesse de défilement de la corde peut varier, par exemple de 60 à 200 mètres par minute. E fait, cette vitesse n'est limitée que par la vitesse d'impression lorsque 1'opération de martelage est effectuée en combinaison avec une tête d'impression.The rope 2 is stretched between two return pulleys 3 and 4. The idler pulleys 3 and 4 are arranged on either side of two pairs of wheels 5,6 and 7,8 respectively, each wheel of a pair turning in opposite direction of the other wheel. Thus, if the toothed wheel 5 rotates in the sinistrorsum direction, the grooved wheel 6 rotates in the dextrorsum direction. The same goes for the second pair. The cups are formed by a peripheral contact of the teeth 9 with the upper part of the cord 2. The speed of travel of the cord can vary, for example from 60 to 200 meters per minute. In fact, this speed is only limited by the printing speed when The hammering operation is carried out in combination with a print head.
Les roues sont simplement entraînées par le passage du fil 2. Toutefois, elles peuvent être munies d'un entraînement motorisé autonome. Par ailleurs un vérin (non représenté) exerce entre les paires de roues la pression nécessaire.The wheels are simply driven by the passage of wire 2. However, they can be provided with an autonomous motorized drive. Furthermore, a jack (not shown) exerts the necessary pressure between the pairs of wheels.
EXEMPLE: La corde représentée sur la figure 1 est une corde TECNIFIBRE® du type 625 TGV, d'un diamètre de 1,40mm et présente une résistance à la rupture supérieure à 80 daNs. Son allongement de rupture est de l'ordre de 25 , et sa masse de 1,87 gramme par mètre, et de onze fils multifilaments de polyamide 6.6, chacun incluant 140 filaments dont le diamètre est de 28 microns enrobés à cœur par du polyuréthane. L'ensemble des fils est retordu à raison de 80 tours/mètre. Les cuvettes sont espacées de quatre millimètres et leur profondeur est de cinq centièmes de millimètre.EXAMPLE: The rope shown in Figure 1 is a TECNIFIBRE® rope of the 625 TGV type, with a diameter of 1.40mm and has a breaking strength greater than 80 daNs. Its elongation at break is of the order of 25, and its mass is 1.87 grams per meter, and eleven polyamide 6.6 multifilament yarns, each including 140 filaments with a diameter of 28 microns coated at the core with polyurethane. All of the wires are twisted at the rate of 80 turns / meter. The bowls are spaced four millimeters apart and their depth is five hundredths of a millimeter.
L'opération qui vient d'être décrite permet une plus grande facilité de cordage dans le cas de cordes très raides en polyester ou analogue et donne une meilleure accroche de la balle sur le tamis et, par suite, une amplification des effets.The operation which has just been described allows greater ease of stringing in the case of very stiff polyester or similar strings and gives better grip of the ball on the sieve and, consequently, an amplification of the effects.
Il va de soi que de nombreuses variantes peuvent être apportées, notamment par substitution de moyens techniquement équivalents sans pour autant sortir du cadre de l'invention. En particulier, la présente invention peut s'appliquer à toute corde synthétique thermoplastique. It goes without saying that many variants can be made, in particular by replacing technically equivalent means without departing from the scope of the invention. In particular, the present invention can be applied to any thermoplastic synthetic cord.

Claims

REVENDICATIONS
° Procédé de fabrication d'une corde synthétique, caractérisé en ce que, après sa constitution, la corde° Process for manufacturing a synthetic rope, characterized in that, after its constitution, the rope
>>
(2) est soumise séquentiellement à des pressions locales.(2) is sequentially subjected to local pressures.
° Corde synthétique, notamment pour raquette de tennis, obtenue par le procédé de la revendication 1, caractérisée en ce que, après constitution de la corde (2), celle-ci est soumise à un martelage provoquant des cuvettes superficielles (1).° Synthetic string, in particular for tennis rackets, obtained by the process of claim 1, characterized in that, after constitution of the string (2), it is subjected to hammering causing superficial cups (1).
° Corde synthétique, selon la revendication° Synthetic rope, according to claim
2, caractérisée en ce que les cuvettes (1) sont diamétralement opposées l'une à l'autre.2, characterized in that the bowls (1) are diametrically opposed to each other.
° Corde synthétique composite selon la revendication 2 ou 3, caractérisée en ce qu'elle est constituée de fils multifilaments en polyamide intégrés à une matrice de polyuréthane.° Composite synthetic rope according to claim 2 or 3, characterized in that it is made up of polyamide multifilament threads integrated into a polyurethane matrix.
° Corde synthétique selon la revendication 2 ou 3, caractérisée en ce qu'elle est constituée de polyester ou analogue. 6° Dispositif de mise en œuvre du procédé selon la revendication 1, caractérisé en ce que la corde (2) est acheminée entre deux paires de roues (5,6) et (7,8) dont l'une (5,8) est dentée de sorte que la corde soit martelée successivement sur une face puis sur la face diamétralement opposée. ° Synthetic rope according to claim 2 or 3, characterized in that it is made of polyester or the like. 6° Device for implementing the method according to claim 1, characterized in that the rope (2) is conveyed between two pairs of wheels (5.6) and (7.8), one of which (5.8) is toothed so that the rope is hammered successively on one side then on the diametrically opposite side.
PCT/FR2004/050014 2003-01-16 2004-01-14 Synthetic strings for racket and method for making same WO2004064929A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10/542,476 US20060182959A1 (en) 2003-01-16 2004-01-14 Synthetic strings for racket and method for making same
EP04701985A EP1583591A2 (en) 2003-01-16 2004-01-14 Synthetic strings for racket and method for making same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0300702A FR2850030B1 (en) 2003-01-16 2003-01-16 SYNTHETIC ROPE FOR RACKET AND METHOD FOR MANUFACTURING THE SAME
FR0300702 2003-01-16

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WO2004064929A2 true WO2004064929A2 (en) 2004-08-05
WO2004064929A3 WO2004064929A3 (en) 2004-09-16

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PCT/FR2004/050014 WO2004064929A2 (en) 2003-01-16 2004-01-14 Synthetic strings for racket and method for making same

Country Status (4)

Country Link
US (1) US20060182959A1 (en)
EP (1) EP1583591A2 (en)
FR (1) FR2850030B1 (en)
WO (1) WO2004064929A2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434533A (en) * 1945-05-24 1948-01-13 Paul D Wurzburger Imitation filaments, ropes, yarns, and the like
US6117383A (en) * 1997-07-25 2000-09-12 Kirschbaum Sportartikel Gmbh Process for producing strings for stringing rackets

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2491098B1 (en) 1980-09-26 1983-05-27 Cousin Freres Sa
US4805393A (en) * 1986-11-20 1989-02-21 Reta Marcos A String construction for a sports racket

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434533A (en) * 1945-05-24 1948-01-13 Paul D Wurzburger Imitation filaments, ropes, yarns, and the like
US6117383A (en) * 1997-07-25 2000-09-12 Kirschbaum Sportartikel Gmbh Process for producing strings for stringing rackets

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1583591A2 *

Also Published As

Publication number Publication date
WO2004064929A3 (en) 2004-09-16
FR2850030A1 (en) 2004-07-23
US20060182959A1 (en) 2006-08-17
EP1583591A2 (en) 2005-10-12
FR2850030B1 (en) 2007-03-23

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