EP1154822A1 - Raquette pour jeu de balle - Google Patents

Raquette pour jeu de balle

Info

Publication number
EP1154822A1
EP1154822A1 EP00907599A EP00907599A EP1154822A1 EP 1154822 A1 EP1154822 A1 EP 1154822A1 EP 00907599 A EP00907599 A EP 00907599A EP 00907599 A EP00907599 A EP 00907599A EP 1154822 A1 EP1154822 A1 EP 1154822A1
Authority
EP
European Patent Office
Prior art keywords
strings
string
cross
ball game
elastic
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.)
Granted
Application number
EP00907599A
Other languages
German (de)
English (en)
Other versions
EP1154822B1 (fr
Inventor
Horst Kirschbaum
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.)
Kirschbaum Sportartikel GmbH
Original Assignee
Kirschbaum Sportartikel GmbH
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 Kirschbaum Sportartikel GmbH filed Critical Kirschbaum Sportartikel GmbH
Publication of EP1154822A1 publication Critical patent/EP1154822A1/fr
Application granted granted Critical
Publication of EP1154822B1 publication Critical patent/EP1154822B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • A63B51/10—Reinforcements for stringing
    • A63B51/11—Intermediate members for the cross-points of the strings

Definitions

  • the invention relates to a ball game racket, in particular tennis racket, with a plurality of main strings and a plurality of cross strings arranged substantially perpendicular to the main strings, the main strings forming crossover points with the cross strings and at least at a part of the crossover points between a respective main string and a respective cross string against falling out secured, elastic intermediate links are provided.
  • Such a ball game racket is known from DE-OS 2654896.
  • the focus of this document is the task of blocking cross and longitudinal strings of a ball game racket at the crossing points so that the strings cannot move against each other.
  • the intermediate links described there should consist of rigid or semi-rigid material, preferably of a plastic such as polyacethal or polyamide resin, but also of a metal.
  • the possibility is also mentioned that the intermediate members can store and return elastic energy.
  • the pontics are essentially fully cylindrical in shape and have a diameter of 3 to 4 mm. Grooves are provided to accommodate the strings, the bottoms of which should be at a distance from one another of between 0 and 0.4 mm.
  • the tennis racket described in the publication has a string made of natural casing, which is the preferred material for playing tennis, since natural casing has an elastic elongation of 25% and shows no signs of material fatigue over a longer period of time.
  • natural gut strings are very expensive, so that they significantly increase the purchase price of a tennis racket. For this reason, tennis rackets with strings made of nylon or polyester are predominantly used.
  • Elongation of the strings also quickly reduces the elasticity of conventional strings until they finally no longer have any elasticity.
  • the invention is therefore based on the object of creating a ball game racket which is variable in its playing properties and those of a tennis racket with strings from natural casings, without natural casings, as close as possible to or even surpasses natural casings.
  • the main strings and the cross strings are made of a material which has a maximum elastic elongation of 15%, and
  • the intermediate links in the direction from a respective cross string to a respective main string have an elastic compression which is at least 20% at a pressure of 22 N / mm 2 .
  • the main strings and the cross strings whose elastic elongation is limited to a maximum of 15%, materials for the strings come into question according to the invention, which generally show less fatigue due to continuous stress on the ball game racket than previously used materials for Ball game racket strings.
  • the elastic stretch for nylon strings is 28%, while the elastic stretch for polyester strings is between 15% and 25%.
  • string materials which have not previously been considered in bali rackets.
  • steel salty, aramid fibers with an elastic elongation of about 4% and strings made of Keflar can be used.
  • the cross strings and the long strings preferably consist of highly stretched polyester with an elastic elongation in the range from 8 to 12%.
  • a ball game racket is provided according to the invention by the intermediate members whose elastic compression exceeds a predetermined minimum value, ie that their elasticity must have a minimum value.
  • the number of pontics to be provided depends on the desired elasticity of the covering. Basically, the elastic compression of the pontics must increase with the decreasing elastic elongation of the strings.
  • the intermediate elements act like spring elements that are pressed together by the impact of a ball on the fabric and then return their stored elastic energy back to the ball.
  • At least 20% of the crossing points are preferably equipped with the pontics.
  • 50% and even 95% of the crossing points can be equipped with pontics.
  • the proportion of crossing points equipped with pontics should be as high as possible.
  • the intermediate links can consist, for example, of polyurethane or rubber. In principle, however, any material is conceivable that meets the requirements for elastic compression. Intermediate links are also conceivable which consist of several components, one of which is designed as a spring element. The materials polyurethane and rubber, however, are characterized by the fact that they can be subjected to permanent stress without showing signs of fatigue. It must be taken into account here that the intermediate links are only stressed for about 10 minutes over the life of, for example, a commercially available tennis string.
  • the elastic compression of the intermediate links at a pressure of 22 N / mm 2 is between 40 and 70%, particularly preferably between 50 and 60%. It has been shown that a length of a full material cylinder made of polyurethane of 0.8 to 1.2 mm with a diameter between 1.5 and 2 mm is particularly favorable.
  • the end strings of the intermediate links facing a main string or a cross string preferably each have a groove for receiving the main or cross string.
  • the shape of the groove can be adapted to that of a conventional tennis string which has a diameter of 1.0 to 1.4, preferably of 1.1 to 1.2 mm.
  • the intermediate links can have a cross section in their central region which is larger than the cross section of the intermediate links on the end strings. In this way, the middle area of the intermediate links has an increased spring force, which is decisive for the elasticity of the intermediate link.
  • the rebound forces can be applied almost without fatigue, since a short compressive stress does not damage the material as much as a permanent tensile stress and even after a long playing time there is only a very short stress period.
  • the relatively inelastic string gives the necessary control and precision, which prevents the ball from being immersed too deeply on the stringing surface and thus prevents an undesirable trampoline effect.
  • Figure 1 shows an embodiment of an intermediate member for a tennis racket.
  • Fig. 2 shows another embodiment of an intermediate link for a tennis racket;
  • FIG. 3 shows the embodiment for an intermediate member of FIG. 2 m compressed state
  • Fig. 6 shows another embodiment of an intermediate member for a tennis racket.
  • FIG. 1 shows an intermediate link 1 for a string crossing of the strings of a tennis racket made of highly stretched polyester with an elastic elongation of 10%.
  • the intermediate member 1 which is made of polyurethane material.
  • the two ends 2, 3 of the intermediate member 1 are designed as groove-shaped brackets which are arranged at a 90 ° angle to one another and which partially encompass the strings which cross one another.
  • a block 4 made of polyurethane material is arranged between these two holders.
  • This block 4 is referred to here as a "spring element" because it is mainly responsible for the cushioning of the strings against one another in the event of a compressive stress caused by the elongation of the strings.
  • the entire intermediate link is made in one piece from the resilient polyurethane material, part of the suspension also takes place in the area of the brackets.
  • the spring element is designed as a cube with an edge length of approximately 1-2 mm. leads.
  • the brackets are elongated half-shells that protrude on both sides beyond the spring element.
  • the spring element is designed as a cuboid with a length of approx. 1.5 mm and a base area of approx. 1.2 x 1.2 mm.
  • the cup-shaped brackets resting on the strings are flush with the spring element.
  • FIG. 3 shows the intermediate link 5 from FIG. 2, the two strings being pressed against one another by impact stress. This can be done on the one hand by striking the strings directly from the ball and thus pressing the strings one above the other. Due to the alternately interwoven arrangement of the strings (cf. FIG. 4), such a pressure load is distributed over the entire string surface, so that pressure forces also occur at such string crossings, which are located away from the point of impact of the ball.
  • the spring element is elastically compressed under the pressure load. This results in the storage of energy in the spring element, which is released again during the subsequent springback. While here only a very small spring travel is achieved at the individual crossing point (depending on the embodiment, the total height of the intermediate link is approximately 0.5 to 2.5 mm), the total spring force important for the play properties of the covering results from the addition of the spring forces of the individual Intermediate elements. Depending on the number of longitudinal cross strings and the resulting crossing points of the strings of a racket, the number of possible intermediate elements is 300 to 400 pieces.
  • the covering is formed from a relatively inelastic string that cannot otherwise be used, for example a steel side or a plastic string made of highly stretched polyester (polyethylene esterphthalate).
  • the intermediate links 5 already described are inserted at some string crossings m. This results in a greater clamping force because the intermediate links have a longitudinal expansion of 0.5 to 2.5 mm.
  • the hardness of the covering is subsequently increased. Coverings that have already lost part of their elasticity due to elongation of the strings under stress can thus be given a higher covering hardness by subsequently inserting the intermediate links and regain elasticity that has already been lost.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Laminated Bodies (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)

Abstract

L'invention concerne une raquette pour jeu de balle, notamment une raquette de tennis, comportant plusieurs cordes longitudinales et plusieurs cordes transversales montées sensiblement perpendiculairement aux cordes longitudinales. Les cordes longitudinales forment des points d'intersection avec les cordes transversales. Il est prévu sur au moins une partie des points d'intersection entre une corde longitudinale et une corde transversale, des éléments intermédiaires élastiques, fixés de manière à ne pas se détacher. L'invention vise à rendre les propriétés de jeu de cette raquette plus variables. A cet effet, les cordes longitudinales et les cordes transversales consiste en un matériau dont l'allongement longitudinal élastique ne dépasse pas 15 %. Les éléments intermédiaires présentent en direction d'une corde transversale par rapport à une corde longitudinale, une déformation élastique d'au moins 20 %, à une pression de 22 N/mm2.
EP00907599A 1999-02-22 2000-02-22 Raquette pour jeu de balle Expired - Lifetime EP1154822B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19907291 1999-02-22
DE19907291 1999-02-22
PCT/EP2000/001448 WO2000050126A1 (fr) 1999-02-22 2000-02-22 Raquette pour jeu de balle

Publications (2)

Publication Number Publication Date
EP1154822A1 true EP1154822A1 (fr) 2001-11-21
EP1154822B1 EP1154822B1 (fr) 2005-12-28

Family

ID=7898253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00907599A Expired - Lifetime EP1154822B1 (fr) 1999-02-22 2000-02-22 Raquette pour jeu de balle

Country Status (4)

Country Link
EP (1) EP1154822B1 (fr)
AU (1) AU2913300A (fr)
DE (1) DE50011973D1 (fr)
WO (1) WO2000050126A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109550202A (zh) * 2018-12-18 2019-04-02 邬惠林 一种羽毛球十字拍线垫
TWI820685B (zh) * 2022-04-22 2023-11-01 陳威融 可產生震波疊加裝置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR721797A (fr) * 1931-08-20 1932-03-08 Cales élastiques à interposer dans le réseau formé par les cordes des raquettes de tennis, et instrument pour réaliser cette opération
FR786619A (fr) * 1935-03-02 1935-09-06 Raquette de tennis à cadre métallique
CH570176A5 (fr) * 1972-12-01 1975-12-15 Dischinger Gebhard
CH607748A5 (fr) 1975-12-04 1978-10-31 Gibello Carlo Selcom Camsa S A
SE407152B (sv) * 1976-04-02 1979-03-19 Goransson Per Gunnar Magnus Rackett
JPS5519107A (en) * 1978-07-27 1980-02-09 Kureha Chemical Ind Co Ltd Gut and its preparation
DE2922631C2 (de) * 1979-06-02 1985-12-05 Werner 8313 Vilsbiburg Fischer Saitenschutzteilchen für eine Tennisschlägerbespannung
DE4305829C2 (de) * 1993-02-25 1995-10-12 Pielenz Flechtgarne Kg Saite sowie Verfahren zur Herstellung einer derartigen Saite
JP2826055B2 (ja) * 1993-12-27 1998-11-18 株式会社ゴーセン ラケット用ガット及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0050126A1 *

Also Published As

Publication number Publication date
AU2913300A (en) 2000-09-14
WO2000050126A1 (fr) 2000-08-31
DE50011973D1 (de) 2006-02-02
EP1154822B1 (fr) 2005-12-28

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