US20060182959A1 - 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
US20060182959A1
US20060182959A1 US10/542,476 US54247604A US2006182959A1 US 20060182959 A1 US20060182959 A1 US 20060182959A1 US 54247604 A US54247604 A US 54247604A US 2006182959 A1 US2006182959 A1 US 2006182959A1
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US
United States
Prior art keywords
string
synthetic
dimples
multifilament
synthetic string
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/542,476
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English (en)
Inventor
Yves Delvael
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
COUSIN COMPOSITES
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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
Assigned to COUSIN COMPOSITES reassignment COUSIN COMPOSITES ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DELVAEL, YVES
Publication of US20060182959A1 publication Critical patent/US20060182959A1/en
Abandoned legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • 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 object of the present invention is a composite synthetic string, designed in particular, but not exclusively for stringing tennis rackets or rackets for other types of similar ball games, such as squash or badminton and a method and device that gives flexibility to the string for allowing the rackets to be strung more easily.
  • FR-A-2 491 098 discloses a synthetic string with two components: multifilament polyamide threads and polyurethane, the multifilaments being integrated in a polyurethane matrix.
  • the polyurethane binder whose elastic behavior is much greater than that of polyamide, allows greater resistance to breaking and medium hardness resulting in a rapid return of the string to its initial position after impact of a ball to be obtained with a particular structure of the string.
  • Monofilament tennis strings extruded from polyester and/or polyetherether presenting a lifetime that is greater than that of the strings cited above are also known, but with inferior game characteristics. These strings, due to their rigidity, are very difficult to string, so this operation requires more time than with one of the strings cited previously.
  • the object of the present invention is a tennis or similar racket string, composite or monofilament, that allows easy stringing with an equivalent lifetime, and presents better gripping of the ball on the racket face during impact as well as a novel characteristic aspect.
  • the synthetic string particularly for tennis rackets, is characterized in that it presents a series of dimples distributed according to a given step.
  • the manufacturing process is characterized in that, after its production, the string sequentially undergoes pressures according to a given step.
  • This pressure may be exerted on a single side of the string or on several sides of the latter in the long axis of the latter or in a helix.
  • the dimples are diametrically opposed with relation to each other.
  • This operation locally produces a sort of hardening that gives the desired flexibility and a novel appearance to the string.
  • this operation gives the flexibility that is necessary for easy stringing of the string.
  • the pressure leads to a local disorganization of the molecular network that results in a modification in the reflection coefficient.
  • a polyamide-polyurethane string such as that mentioned previously, as in the case of a polyester string, better grip of the ball on the racket face is observed, hence the stronger effects.
  • the invention also deals with a device allowing the implementation of the method.
  • the string is conveyed between two pairs of wheels in which one is toothed in such a way that the string is hammered successively on one side and then on the opposite side.
  • FIG. 1 a view of a section of string according to the invention.
  • FIG. 2 a view of a device for implementing the method comprising two pairs of wheels.
  • the section of string 2 presents dimples 1 on its two sides resulting from the pressure exerted by the teeth of the toothed wheels.
  • the height of said dimples is on the order of five hundredths of mm for a string whose diameter is 1.4 millimeters.
  • the step of the dimples is, for example, four millimeters.
  • These dimples 1 preferably are formed between two wheels wherein one presents a guiding recess and wherein the other is equipped with teeth.
  • Such a device is schematically represented in FIG. 2 .
  • String 2 is held between two guide rollers 3 and 4 .
  • the guide rollers 3 and 4 are disposed on both sides of two pairs of wheels respectively 5 , 6 and 7 , 8 , each wheel of a pair turning in the opposite direction from the other wheel. Therefore, if the toothed wheel 5 turns in the counterclockwise direction, the guiding wheel 6 turns in the clockwise direction. The same is true for the second pair.
  • the dimples are formed by peripheral contact of the teeth 9 with the upper part of the string 2 .
  • the transport speed of the string may vary, for example from 60 to 200 meters per minute. In fact, this speed is only limited to the impression speed when the hammering operation is performed in combination with an impression head.
  • the wheels are simply driven by the passage of the thread 2 . However, they may be equipped with an autonomous motorized drive. In addition, a cylinder (not represented) exerts the necessary pressure between the pairs of wheels.
  • the string represented in FIG. 1 is a 625 TGV TECNIFIBRE® type string, with a diameter of 1.40 mm and presents a resistance to breaking that is greater than 80 daNs. Its breaking elongation is on the order of 25% and its mass is 1.87 grams per meter, with eleven polyamide 6.6 multifilament threads, each including 140 filaments whose diameter is 28 microns coated with polyurethane. The set of threads is twisted at a rate of 80 turns per meter. The dimples are spaced by four millimeters and their depth is five hundredths of a millimeter.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
US10/542,476 2003-01-16 2004-01-14 Synthetic strings for racket and method for making same Abandoned US20060182959A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0300702A FR2850030B1 (fr) 2003-01-16 2003-01-16 Corde synthetique pour raquette et son procede de fabrication
FR0300702 2003-01-16
PCT/FR2004/050014 WO2004064929A2 (fr) 2003-01-16 2004-01-14 Corde synthétique pour raquette et son procédé de fabrication

Publications (1)

Publication Number Publication Date
US20060182959A1 true US20060182959A1 (en) 2006-08-17

Family

ID=32605938

Family Applications (1)

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

Country Status (4)

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

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 (fr) 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

Also Published As

Publication number Publication date
FR2850030A1 (fr) 2004-07-23
FR2850030B1 (fr) 2007-03-23
EP1583591A2 (fr) 2005-10-12
WO2004064929A3 (fr) 2004-09-16
WO2004064929A2 (fr) 2004-08-05

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Legal Events

Date Code Title Description
AS Assignment

Owner name: COUSIN COMPOSITES, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DELVAEL, YVES;REEL/FRAME:016629/0209

Effective date: 20050825

STCB Information on status: application discontinuation

Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION