EP3016721B1 - Raquette en magnésium - Google Patents

Raquette en magnésium Download PDF

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Publication number
EP3016721B1
EP3016721B1 EP14745093.6A EP14745093A EP3016721B1 EP 3016721 B1 EP3016721 B1 EP 3016721B1 EP 14745093 A EP14745093 A EP 14745093A EP 3016721 B1 EP3016721 B1 EP 3016721B1
Authority
EP
European Patent Office
Prior art keywords
frame
wall thickness
magnesium
process according
halves
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.)
Active
Application number
EP14745093.6A
Other languages
German (de)
English (en)
Other versions
EP3016721A1 (fr
Inventor
Daniel Lau
Harald Rosenkranz
Ralf Schwenger
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.)
Head Technology GmbH
Original Assignee
Head Technology GmbH
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Filing date
Publication date
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Publication of EP3016721A1 publication Critical patent/EP3016721A1/fr
Application granted granted Critical
Publication of EP3016721B1 publication Critical patent/EP3016721B1/fr
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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
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • 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
    • A63B49/10—Frames made of non-metallic materials, other than wood
    • 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
    • A63B49/12—Frames made of metal
    • 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
    • A63B2049/0205—Frames comprising at least two similar parts assembled with the interface plane parallel to the string plane
    • 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
    • A63B2049/0211—Frames with variable thickness of the head in a direction perpendicular to the string plane
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/02—Tennis
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres

Definitions

  • the frame for a ball game racket in the blown from prepregs made so it is extremely challenging to vary the wall thickness of the frame specifically to influence the local stiffness of the frame and the weight distribution of the same.
  • the wall thickness of the frame profile is usually constant, since aluminum profiles with a constant cross-section are used.
  • the frame produced according to the invention for a ball game racket in particular for a tennis racket, has a head section and a grip section.
  • the frame is designed as a hollow profile and has magnesium, wherein the wall thickness of the hollow profile varies along a cross section through the frame hollow profile.
  • hollow profile is understood in the context of the present invention, a real hollow profile, which is formed only by a frame wall which surrounds a cavity, said cavity is free of additional walls, struts and the like.
  • mechanical properties such as bending stiffness and natural frequencies are determined essentially exclusively by the variable wall thickness of the hollow profile, without, for example, requiring additional stabilization struts.
  • magnesium or magnesium alloys can be used for a frame hollow profile for a ball game racket.
  • the manufacturing techniques used in this case advantageously allow a targeted variation of the wall thickness of the hollow profile, in particular also along a cross section through the frame hollow profile.
  • the section through the frame hollow profile is understood to mean a section perpendicular to the contour of the frame profile.
  • Targeted variation of the wall thickness along such a cross-section through the frame hollow profile is virtually impossible with the aid of the generally customary blow-molding method since the prepreg layers are generally wound to extend along such a cross-section through the frame hollow profile.
  • Usually only different cross-sectional shapes and / or dimensions can be realized in the blow-molding process.
  • the frame is produced by means of magnesium injection molding techniques according to the so-called thixotropic method.
  • wall thickness can be easily achieved appropriate training of the injection mold specifically vary.
  • melt-core technique in which an injection mold core is melted after the molding of the frame.
  • the wall thickness of the hollow profile varies not only along a cross-section through the frame hollow profile, but additionally also in the longitudinal direction of the frame, i. varies along the frame contour.
  • the wall thickness in the heart region or in the transition between bridge and head section of the frame is preferably greater than in the remaining head section.
  • the variation of the wall thickness along at least one transverse and / or longitudinal section relative to the minimum wall thickness is at least 25%, preferably at least 50%, more preferably at least 75% and particularly preferably at least 100%.
  • the wall thickness of the frame according to the invention is thinner in sections than 1 mm, preferably thinner than 0.8 mm, more preferably thinner than 0.7 mm and particularly preferably thinner than 0.6 mm.
  • the magnesium or magnesium alloy content does not have to be evenly distributed over the ball game racket frame. Rather, it is also preferred that the frame has a frame portion having magnesium, wherein the wall thickness of the hollow profile varies along a cross section through this frame portion.
  • the frame in this frame portion has at least 50% by weight, more preferably at least 80% by weight, even more preferably at least 90% by weight and most preferably at least 95% by weight of magnesium.
  • one or more components may be made separately from magnesium or a magnesium alloy, in particular injection molded. These components can then be placed together with the prepreg layers in a Schlauchblasform and pressed together with the prepreg layers. These separate components may be individual sections of the head section or handle section.
  • a separate heart region which consists of magnesium or has magnesium or magnesium alloys, is particularly preferably provided, since particularly advantageous effects can be achieved in this region with a corresponding variation of the wall thickness.
  • the core material preferably comprises one or a combination of the following materials or consists of one or a combination of the following materials: tin-based alloys (preferably at least 50% tin and optionally zinc, bismuth, antimony, copper, silver, lead, indium), Bismuth based alloys (preferably at least 50% bismuth and optionally tin, silver, germanium), lead based alloys (preferably at least 50% lead and optionally tin, antimony, bismuth, silver, indium), zinc based alloys (preferred at least 50% zinc), die-cast zinc alloys such as ZnAl4, ZnAl4Cu1, ZnA14Cu3, indium-based alloys, glass, plastic with or without glass-fiber reinforcement such as polyamide.
  • tin-based alloys preferably at least 50% tin and optionally zinc, bismuth, antimony, copper, silver, lead, indium
  • Bismuth based alloys preferably at least 50% bismuth and optionally tin, silver, germanium
  • an injection mold and a core are provided, wherein the core consists of a salt.
  • the frame (or frame member) is then molded between the injection mold and the core, preferably by the thixotropic method, by introducing a material comprising magnesium.
  • the core is washed out by introducing water into the cavity formed by the frame.
  • the core can also be made of an acid-soluble material, e.g. glass base, so that the core can be removed from the frame after forming the frame with the help of an acid.
  • an acid-soluble material e.g. glass base
  • first two frame halves are cast from a material which comprises magnesium. This is preferably done using the so-called thixotropic method. Subsequently, the two frame halves are connected to form a frame.
  • first two frame section halves of a material comprising magnesium are cast, and then the two frame section halves are firstly cast Frame section connected.
  • a second frame section is provided and the first and second frame sections are connected to form a frame.
  • the second frame section may be an unfinished section, for example a prepreg tube, so that the finishing of the second frame section and the connection of the second frame section to the first frame section occur in one method step.
  • the injection molding of the magnesium-containing material is preferably carried out at temperatures between 500 ° C and 800 ° C, more preferably at temperatures between 550 ° C and 700 ° C.
  • the injection of the material into the mold is preferably carried out in less than 80 ms, more preferably in less than 60 ms and particularly preferably in less than 50 ms.
  • the step of connecting the two frame halves or frame section halves preferably comprises welding and / or pressing and / or gluing. Furthermore, the two frame halves or frame section halves are preferably identical, wherein each of the two frame halves or frame section halves is formed asymmetrically with respect to the longitudinal axis.
  • the frame according to the invention for a ball game racket has a number of technical advantages over the prior art.
  • magnesium has higher density, lower specific stiffness, and lower specific strength than conventional prepreg materials
  • a frame for a magnesium or magnesium magnesium racket can be better optimized for stiffness and strength at the same weight, as the wall thickness can be reduced to simple Way can be optimally designed.
  • the use of magnesium injection molding allows automated production with short cycle times of approx. 35 seconds.
  • a pre- and post-processing, which are often done manually by conventional Perpreg compiler, accounts for virtually completely. Injection molding also allows excellent production stability and allows to produce exactly the desired structure using a defined injection mold.
  • FIG. 1 shows in perspective view a frame for a ball game racket according to a preferred embodiment of the present invention.
  • the frame is formed as a hollow profile and has a head portion 1 for receiving a fabric, not shown, a handle portion 2 and a heart portion 3, which has two arms 4a and 4b and a bridge 5.
  • the scope of this preferred embodiment is composed of two identical frame halves, with respect to the frame longitudinal axis are formed asymmetrically. One of these two identical frame halves is in perspective view in FIG. 2 shown.
  • the asymmetry of the frame half is provided so that the two frame halves can join each other during assembly.
  • the protruding webs 5a of the bridge 5 can engage with the step-shaped sections 5b of the bridge 5 of the respective other frame half. This allows a flush connection of the two frame halves to a frame.
  • the head portion (see. FIG. 5 ) Areas with projecting webs 1a and stepped portions 1b.
  • FIG. 6 is a cross section through the frame hollow profile of the frame FIG. 1 represented in the region of the head section 1.
  • the wall thickness of the frame hollow profile according to the invention vary quite considerably along a cross section through the frame hollow profile.
  • Such a finely tuned cross-sectional profile could not be achieved using the conventional bubble-blowing process.
  • magnesium or a magnesium alloy is injection-molded, such a cross-sectional profile can be designed in a simple manner by appropriate design of the injection mold, wherein the cross-sectional profile can additionally vary along the frame contour in the longitudinal direction.
  • FIG. 7 is a cross section through the hollow profile in the region of the bridge 5 is shown. Again, the wall thickness of the hollow profile varies, although the variation is not as pronounced as in the example of FIG. 6 ,
  • FIG. 8 An additional variation of the wall thickness in the longitudinal direction of the frame, ie along the frame contour, is in FIG. 8 to see a longitudinal section through the handle section 2 of the frame FIG. 1 shows.
  • the wall thickness of the frame hollow profile increases significantly in the region of the transition to the arm 4b.
  • the frame can also have a section or a separate component made of magnesium or a magnesium alloy.
  • a preferred embodiment of such a separate component of magnesium alloy is in the FIGS. 9 to 13 shown.
  • This is a section of the heart area, namely the bridge 5 and sections of the arms 4a and 4b and in the transition of the heart area in the head section.
  • the stress on this frame part during the game is particularly complex, so that in this area by means of a variation of the wall thickness of the hollow profile, the greatest effect can be achieved.
  • other insert components such as, for example, the grip section or regions of the head section can likewise be made of magnesium or a magnesium alloy and inserted into the frame according to the invention.

Claims (12)

  1. Procédé de fabrication d'un cadre ou d'un segment de cadre pour une raquette pour jeu de balle, avec une partie de tête (1) et une partie de poignée (2), où au moins une partie du cadre est réalisée comme profilé creux et comporte du magnésium, et l'épaisseur de paroi du profilé creux varie le long d'une section transversale du profilé creux de cadre, ledit procédé comprenant les étapes suivantes :
    préparation d'un moule et d'un noyau, le noyau étant constitué d'un matériau dont la température de fusion est inférieure à 400 °C ;
    moulage du cadre ou du segment de cadre au moyen du procédé thixo par apport d'un matériau contenant du magnésium entre le moule et le noyau ; et
    fusion du noyau par chauffage du cadre ou du segment de cadre avec le noyau au-dessus de la température de fusion du noyau, sans dépasser la température de distorsion à la chaleur du cadre ou du segment de cadre.
  2. Procédé selon la revendication 1, où le matériau du cadre comprend au moins 50 % en poids, avantageusement au moins 80 % (en poids), préférentiellement au moins 90 % (en poids), tout particulièrement au moins 95 % (en poids) de magnésium.
  3. Procédé selon la revendication 1 ou la revendication 2, où le matériau du cadre comporte un alliage de magnésium, avantageusement un alliage renforcé par des fibres ou des particules, tout particulièrement SAE SiC/AZ91.
  4. Procédé selon l'une des revendications précédentes, où le matériau du noyau comprend ou est composé d'un des matériaux suivants ou une combinaison de ceux-ci : alliage à base d'étain, alliage à base de bismuth, alliage à base de plomb, alliage à base de zinc, alliage à base d'indium, verre, matière plastique renforcée ou non aux fibres de verre, polyamide.
  5. Procédé selon l'une des revendications précédentes, où l'épaisseur de paroi du profilé creux varie dans le sens de la longueur du cadre ou du segment de cadre.
  6. Procédé selon l'une des revendications précédentes, où la variation de l'épaisseur de paroi le long d'au moins une section transversale et/ou une section longitudinale par rapport à l'épaisseur de paroi minimale est d'au moins 25 %, avantageusement d'au moins 50 %, préférentiellement d'au moins 75 %, tout particulièrement d'au moins 100 %.
  7. Procédé selon l'une des revendications précédentes, où l'épaisseur de paroi du cadre ou du segment de cadre est partiellement inférieure à 1 mm, avantageusement inférieure à 0,8 mm, préférentiellement inférieure à 0,7 mm, tout particulièrement inférieure à 0,6 mm.
  8. Procédé selon l'une des revendications précédentes, où le profilé du cadre dans la partie de tête (1) comprend une section extérieure (7), une section intérieure (6) et deux sections latérales (8a, 8b), et où l'épaisseur de paroi de la section intérieure et/ou de la section extérieure est au moins partiellement supérieure à l'épaisseur de paroi des sections latérales et/ou l'épaisseur de paroi de la section intérieure et/ou de la section extérieure est au moins partiellement inférieure à l'épaisseur de paroi des sections latérales.
  9. Procédé selon l'une des revendications précédentes, où le profilé du cadre dans la partie de tête (1) comprend une section extérieure (7), une section intérieure (6) et deux sections latérales (8a, 8b), et où l'épaisseur de paroi de la section intérieure est au moins partiellement inférieure à l'épaisseur de paroi de la section extérieure.
  10. Procédé selon l'une des revendications précédentes, où le cadre est renforcé localement par des fibres de carbone et/ou des fibres de verre, le cadre étant avantageusement renforcé par des fibres de carbone et/ou des fibres de verre au niveau de la transition entre la partie de tête (1) et la partie de poignée (2).
  11. Procédé selon l'une des revendications précédentes, où le cadre ou le segment de cadre comprend deux moitiés de cadre ou deux moitiés de segment de cadre, soudées, assemblées à la presse et/ou collées l'une à l'autre, les deux moitiés de cadre ou les deux moitiés de segment de cadre étant avantageusement identiques et chacune des deux moitiés de cadre ou des deux moitiés de segment de cadre étant avantageusement prévue asymétrique à l'autre par rapport à l'axe longitudinal du cadre ou à l'axe longitudinal du segment de cadre.
  12. Procédé selon l'une des revendications précédentes, où le cadre comprend un segment de cadre comportant du magnésium, et l'épaisseur de paroi du profilé creux varie le long d'une section transversale dudit segment de cadre, le cadre comprenant avantageusement dans ledit segment de cadre au moins 50 % (en poids), très avantageusement au moins 80 % (en poids), préférentiellement au moins 90 % (en poids), tout particulièrement au moins 95 % (en poids) de magnésium, et/ou où ledit segment de cadre comprend avantageusement deux moitiés de segment de cadre soudées, assemblées à la presse et/ou collées l'une à l'autre.
EP14745093.6A 2013-07-04 2014-07-04 Raquette en magnésium Active EP3016721B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013011174.9A DE102013011174B4 (de) 2013-07-04 2013-07-04 Magnesiumschläger
PCT/EP2014/064300 WO2015001077A1 (fr) 2013-07-04 2014-07-04 Raquette en magnésium

Publications (2)

Publication Number Publication Date
EP3016721A1 EP3016721A1 (fr) 2016-05-11
EP3016721B1 true EP3016721B1 (fr) 2019-09-11

Family

ID=51260836

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14745093.6A Active EP3016721B1 (fr) 2013-07-04 2014-07-04 Raquette en magnésium

Country Status (6)

Country Link
US (1) US20170050090A1 (fr)
EP (1) EP3016721B1 (fr)
CN (1) CN105407987B (fr)
DE (1) DE102013011174B4 (fr)
ES (1) ES2758727T3 (fr)
WO (1) WO2015001077A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3241590A1 (fr) 2016-05-06 2017-11-08 Head Technology GmbH Raquette pour jeu de balle avec pont en magnésium
DE102017000565A1 (de) 2016-05-06 2017-11-09 Head Technology Gmbh Ballspielschläger mit Magnesiumbrücke
RU2750575C1 (ru) * 2020-02-25 2021-06-29 Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" Насос шестеренный реверсивный
USD1026140S1 (en) * 2021-01-28 2024-05-07 Derek Mitchell Rope grip exercise device with looped strap
CN113069741A (zh) * 2021-04-28 2021-07-06 上海迎轩体育科技有限公司 羽毛球拍稳固型三通装置制备工艺

Citations (1)

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US5551689A (en) * 1988-08-18 1996-09-03 Athletic Alternatives Inc. String suspension and frame construction for sports rackets

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US1587919A (en) * 1922-04-26 1926-06-08 Spalding & Bros Ag Racket
DE1757527U (de) * 1957-09-25 1957-12-05 Fuchs Fa Otto Ballspielschlaeger, insbesondere tennisschlaeger.
US3874667A (en) 1972-08-09 1975-04-01 Nl Industries Inc Die-cast light-metal racket and stringing means therefor
US4176841A (en) * 1974-04-10 1979-12-04 Reinhold Sommer Tennis racket
WO1980002510A1 (fr) * 1979-05-17 1980-11-27 J Frolow Raquette de tennis
US4290604A (en) * 1979-08-07 1981-09-22 Ektelon Racquetball racquet having a metal frame meshable with a throat piece
US5358261A (en) * 1993-12-16 1994-10-25 Cheng Chin Cheng Metal racket frame
US6234921B1 (en) * 1999-05-05 2001-05-22 Benetton Sportsystem Usa, Inc. Sports racquets with tripod weighting
CN2460147Y (zh) * 2001-01-15 2001-11-21 厦门侨兴工业有限公司 网球拍改进结构
JP4051198B2 (ja) * 2001-11-14 2008-02-20 ヨネックス株式会社 テニスラケット
CN2897342Y (zh) * 2006-02-27 2007-05-09 白尧嘉 碳纤维复合材料网球拍
CN103083877B (zh) * 2013-02-05 2015-04-15 梁栌伊 羽毛球拍

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5551689A (en) * 1988-08-18 1996-09-03 Athletic Alternatives Inc. String suspension and frame construction for sports rackets

Also Published As

Publication number Publication date
ES2758727T3 (es) 2020-05-06
DE102013011174B4 (de) 2016-08-18
EP3016721A1 (fr) 2016-05-11
CN105407987A (zh) 2016-03-16
WO2015001077A1 (fr) 2015-01-08
DE102013011174A1 (de) 2015-01-08
CN105407987B (zh) 2019-03-15
US20170050090A1 (en) 2017-02-23

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