WO1993008880A1 - Raquette de sport a agencement de cordes hybride - Google Patents

Raquette de sport a agencement de cordes hybride Download PDF

Info

Publication number
WO1993008880A1
WO1993008880A1 PCT/US1992/009500 US9209500W WO9308880A1 WO 1993008880 A1 WO1993008880 A1 WO 1993008880A1 US 9209500 W US9209500 W US 9209500W WO 9308880 A1 WO9308880 A1 WO 9308880A1
Authority
WO
WIPO (PCT)
Prior art keywords
strings
core
stringing
racquet
recited
Prior art date
Application number
PCT/US1992/009500
Other languages
English (en)
Inventor
Importing Company Ferrari
Harry M. Ferrari
Ronald H. Carr
Raymond P. Harrington
Charles N. Vietmeier
Original Assignee
Ferrari Importing Co
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 Ferrari Importing Co filed Critical Ferrari Importing Co
Publication of WO1993008880A1 publication Critical patent/WO1993008880A1/fr
Priority to PCT/US1993/005382 priority Critical patent/WO1994011064A1/fr
Priority to AU45988/93A priority patent/AU4598893A/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
    • 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
    • A63B51/001—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings using strings made of different materials on the same frame, e.g. gut and nylon

Definitions

  • the present invention generally relates to racquets for use in sports games and, more particularly, is concerned with a sports racquet having a hybrid stringing arrangement of longitudinal and cross strings of dissimilar materials.
  • a conventional sports racquet such as a tennis racquet, has a frame which includes a head portion, a throat portion and a handle portion formed as an integral structure.
  • the racquet frame is fabricated of composite-type material composed of high modulus fibers such as graphite fibers or glass fibers in a matrix of an epoxy resin.
  • racquet frames have been fabricated from other materials, such as aluminum, wood and plastics.
  • the head portion of the racquet frame typically has a round or oval configuration and contains a plurality of holes aligned in a common plane. A grid pattern of stringing extends through the holes and is applied under tension across the head portion to provide a ball striking area of the racquet.
  • the handle portion of the racquet frame is usually covered with an outer sheath for facilitating gripping of the racquet by the user's hand.
  • the present invention provides a sports racquet with a hybrid stringing arrangement designed to satisfy the aforementioned needs by optimizing the combination of playability and durability of racquet stringing. Accordingly, the present invention relates to a sports racquet which comprises: (a) a frame having a head portion encompassing an open region; and (b) a hybrid arrangement of stringing applied under tension to the head portion and extending across the open region in an interwoven grid pattern defined by a plurality of longitudinal strings and a plurality of cross strings providing a striking area of the racquet. All of the longitudinal strings of the stringing arrangement are composed of a core of metallic material. All of the cross strings of the stringing arrangement are composed of a non-metallic material, preferably a synthetic material or an animal gut material.
  • Fig. 3 is an enlarged cross-sectional view of a cross string of the hybrid stringing arrangement taken along line 3—3 of Fig. 2.
  • Fig. 4 is an enlarged cross-sectional view of a longitudinal string of the hybrid stringing arrangement taken along line 4—4 of Fig. 2.
  • the handle portion 16 of the racquet frame 10 typically includes an outer sheath (not shown) for facilitating gripping of the racquet by the user's hand.
  • the throat portion 18 typically is in the form of a pair of shafts or legs 20 having a generally V-shaped configuration.
  • a hybrid stringing arrangement 26 of the present invention can be employed in the tennis racquet 10 instead of the conventional stringing 22.
  • the hybrid stringing arrangement 26 is applied under tension to the head portion 14 and extended across the open region 24 in the same interwoven grid pattern as provided by the conventional stringing 22 to also define the ball striking area of the racquet 10.
  • the hybrid arrangement 26 of stringing is defined by a plurality of longitudinal strings 28 and a plurality of cross strings 30 which are composed of different or dissimilar materials. All of the vertical or longitudinal main strings 28 of the stringing arrangement 26 are composed of at least a core 32 of metallic material.
  • the metallic material composing the core 32 of the longitudinal strings 28 can be a ferrous alloy, such as stainless steel or another steel alloy, or a non- ferrous metal, such as titanium or a titanium alloy. Other metallic materials can also be used due to the high strength and resiliency of metallic materials.
  • the metal core of the longitudinal strings 28 is stainless steel or titanium.
  • the non-metallic material composing the cross strings 30 and the outer layer 34 surrounding the core 32 of the longitudinal strings 28 can be a synthetic polymer, such as nylon, polyester, polyolephine, or an aramid, or animal gut (for the cross strings) .
  • the combination of the longitudinal strings 28 of metallic material and cross strings 30 of non-metallic material which comprise the hybrid arrangement 26 of stringing in accordance with the present invention provide improved stringing durability, while retaining acceptable stringing playability.
  • the durability of the longitudinal strings 28 is improved since the wear of these strings is greatly reduced due to the hardness of the metal compared to that of non-metallic material.
  • metal-to-synthetic material such as nylon
  • metal-to-metal contact has a much lower coefficient of friction, than metal-to-metal contact (0.2 compared to 0.8).
  • the stiffness of the metallic longitudinal strings in comparison to the synthetic material or natural gut is stiffer, resulting in less string movement compared to all- synthetic or all natural gut longitudinal and cross strings, which results in greater synthetic or natural gut cross string durability. Therefore, the durability of the combination of metallic longitudinal strings and non-metallic cross strings is vastly improved.
  • Tests have been performed to measure the durability of the hybrid stringing arrangement 26 of the present invention for comparison with that of the prior art. The results are summarized in Table I. These tests involved a cross section of advanced players using various racquet stringing under routine playing conditions, and measuring the amount of time required for the stringing to break.
  • the playability of the hybrid stringing arrangement 26 of the present invention is also vastly improved over all-metallic or all-non-metallic stringing.
  • the resiliency provided by the metallic longitudinal strings 28 and the elasticity provided by the non-metallic cross strings 30 in the hybrid stringing arrangement 26 results in greater stringing bed flexibility and thus a softer, more preferred feeling. This combination also results in a much better energy transfer to the struck ball (greater ball velocity) .
  • Tests have also been performed to measure the playability of the hybrid stringing arrangement 26 and compare it to that of the prior art. The results are summarized in Table II. These tests involved measurement of struck ball velocities while keeping incoming ball velocities constant. These tests were conducted using stainless steel for the longitudinal strings 28, as being representative of the metallic materials, and nylon or animal gut material for the cross strings 30, as being representative of the non-metallic materials.
  • An added advantage to the present invention is the ability to reduce the diameter of the metallic longitudinal strings 28 due to the improved durability of the metallic longitudinal strings and non-metallic cross strings 30 as provided in the hybrid stringing arrangement 26 of the present invention.
  • the smaller diameter strings provide more penetration into the surface of the ball, thus providing for more ball control and spin.
  • the diameter reduction can be greatly improved over that of prior art stringing by at least thirty percent.

Landscapes

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

Abstract

Une raquette de sport (10) comprend un cadre (12) pourvu d'une tête (14) entourant une région libre (24), ainsi qu'un agencement hybride (26) de cordes appliquées sous tension à la tête (14) et s'étendant à travers la région libre (24) en une configuration de grille entrelacée définie par une multiplicité de cordes longitudinales (28) et une multiplicité de cordes transversales (30) constituant une zone de frappe de la raquette (10). Toutes les cordes longitudinales (28) de l'agencement (26) sont composées d'une âme (32) d'un matériau métallique, tel qu'un alliage d'acier inoxydable, enrobée d'une couche externe (34) d'un matériau synthétique tel qu'un polymère approprié. Toutes les cordes transversales (30) de l'agencement de cordes (26) sont composées, soit de boyaux d'animal, soit d'un matériau synthétique tel qu'un polymère approprié.
PCT/US1992/009500 1991-11-07 1992-11-06 Raquette de sport a agencement de cordes hybride WO1993008880A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US1993/005382 WO1994011064A1 (fr) 1992-11-06 1993-06-07 Agencement de cordage hybride, a cordes principales et transversales et a performances ameliorees, destine a une raquette de sport
AU45988/93A AU4598893A (en) 1992-11-06 1993-06-07 Hybrid stringing arrangement of main and cross strings with enhanced performance characteristics for use in a sports racket

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US78897991A 1991-11-07 1991-11-07
US7/788,979911107 1991-11-07

Publications (1)

Publication Number Publication Date
WO1993008880A1 true WO1993008880A1 (fr) 1993-05-13

Family

ID=25146191

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/009500 WO1993008880A1 (fr) 1991-11-07 1992-11-06 Raquette de sport a agencement de cordes hybride

Country Status (2)

Country Link
AU (1) AU3065292A (fr)
WO (1) WO1993008880A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016066706A1 (fr) * 2014-10-30 2016-05-06 Head Technology Gmbh Corde superélastique pour raquette
CN109069907A (zh) * 2016-04-27 2018-12-21 尤尼克斯株式会社 弦组、纵线用弦及横线用弦

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014793A1 (fr) * 1978-08-23 1980-09-03 General Electric Company Procédé et dispositif pour la détection directionnelle des vitesses d'écoulement du sang par ultrasons
US4391088A (en) * 1982-01-13 1983-07-05 United States Tennis Gut Association, Inc. String for sports rackets
US4437662A (en) * 1981-01-26 1984-03-20 Soong Tsai C String load apportioned racket
EP0257424A2 (fr) * 1986-08-11 1988-03-02 Otto Schwertl Corde de tennis, cordage de tennis fait de corde de tennis et procédé de fabrication de la corde de tennis
US4909510A (en) * 1989-02-03 1990-03-20 Sahatjian Ronald A Sports racquet netting

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014793A1 (fr) * 1978-08-23 1980-09-03 General Electric Company Procédé et dispositif pour la détection directionnelle des vitesses d'écoulement du sang par ultrasons
US4437662A (en) * 1981-01-26 1984-03-20 Soong Tsai C String load apportioned racket
US4391088A (en) * 1982-01-13 1983-07-05 United States Tennis Gut Association, Inc. String for sports rackets
EP0257424A2 (fr) * 1986-08-11 1988-03-02 Otto Schwertl Corde de tennis, cordage de tennis fait de corde de tennis et procédé de fabrication de la corde de tennis
US4909510A (en) * 1989-02-03 1990-03-20 Sahatjian Ronald A Sports racquet netting

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
RESEARCH DISCLOSURE, March 1975, No. 131, Racket Strings 13111, p. 13. *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016066706A1 (fr) * 2014-10-30 2016-05-06 Head Technology Gmbh Corde superélastique pour raquette
US10195496B2 (en) 2014-10-30 2019-02-05 Head Technology Gmbh Superelastic racket string
CN109069907A (zh) * 2016-04-27 2018-12-21 尤尼克斯株式会社 弦组、纵线用弦及横线用弦
KR20190022457A (ko) * 2016-04-27 2019-03-06 요넥스 씨오., 엘티디. 스트링 세트, 경사용 스트링 및 위사용 스트링
EP3449983A4 (fr) * 2016-04-27 2020-01-22 Yonex Co. Ltd. Ensemble corde, corde de chaîne, et corde de trame
CN109069907B (zh) * 2016-04-27 2021-08-06 尤尼克斯株式会社 弦组、纵线用弦及横线用弦
KR102668581B1 (ko) * 2016-04-27 2024-05-24 요넥스 씨오., 엘티디. 스트링 세트, 경사용 스트링 및 위사용 스트링

Also Published As

Publication number Publication date
AU3065292A (en) 1993-06-07

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