WO2015001077A1 - Raquette en magnésium - Google Patents

Raquette en magnésium Download PDF

Info

Publication number
WO2015001077A1
WO2015001077A1 PCT/EP2014/064300 EP2014064300W WO2015001077A1 WO 2015001077 A1 WO2015001077 A1 WO 2015001077A1 EP 2014064300 W EP2014064300 W EP 2014064300W WO 2015001077 A1 WO2015001077 A1 WO 2015001077A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
wall thickness
magnesium
frame according
core
Prior art date
Application number
PCT/EP2014/064300
Other languages
German (de)
English (en)
Inventor
Daniel Lau
Harald Rosenkranz
Ralf Schwenger
Original Assignee
Head Technology 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 Head Technology Gmbh filed Critical Head Technology Gmbh
Priority to CN201480037997.6A priority Critical patent/CN105407987B/zh
Priority to ES14745093T priority patent/ES2758727T3/es
Priority to EP14745093.6A priority patent/EP3016721B1/fr
Priority to US14/902,412 priority patent/US20170050090A1/en
Publication of WO2015001077A1 publication Critical patent/WO2015001077A1/fr

Links

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 present invention relates to a frame for a ball game racket having magnesium, and a method of manufacturing such a frame.
  • US 3,874,667 known to use magnesium as a material for the frame of ball game rackets.
  • the racket disclosed in US 3,874,667 consists of a solid metal frame.
  • Such a solid metal frame can meet the usual weight and playability requirements of today
  • 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 present invention has as its object to provide a frame for a ball game racket or a manufacturing method of such a frame, which allows to selectively optimize the rigidity of the frame locally on the variation of the wall thickness and to achieve an optimal weight distribution the total weight of the racket should be kept as low as possible.
  • This object is achieved by a frame for a ball game racket according to claim 1 and by a method for producing a frame for a ball game racket according to claim 17.
  • the frame according to the invention for a ball game racket, in particular for a tennis racket has a head section and a handle 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, a
  • Cavity encloses, this cavity is free of additional walls, struts and the like.
  • mechanical properties such as flexural stiffness and natural frequencies are determined essentially exclusively by the variable wall thickness of the hollow profile, without it being additional, for example
  • the frame according to the invention can, for example, by means of
  • Magnesium injection molding techniques such as the so-called Thixo compiler be made. Using this technique, wall thickness can be easily achieved appropriate training of the injection mold specifically vary. Particular preference is given to the so-called melt-core technique, in which an injection-molded core is melted after the frame has been formed.
  • the wall thickness of the hollow profile not only along a
  • Cross-section through the frame hollow profile varies, but 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 the bridge and head portion of the frame is preferably greater than in the remaining head portion.
  • the variation of the wall thickness along at least one transverse and / or longitudinal section based on 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 frame profile of the frame according to the invention preferably has in the head portion an outer portion facing outward, an inner portion facing inwardly to the fabric, and two side portions, wherein at least partially the wall thickness of the inner and / or outer portion is thicker than the wall thickness of side sections.
  • the frame profile does not have to be rectangular. Rather, further sections can form a flowing transition from the inner or outer section to the two side sections, so that a polygon, a rectangle with rounded corners or the like is formed.
  • the wall thickness of the inner or outer portion is at least partially thinner than the wall thickness of the side portions. Additionally or alternatively, at least in sections, the wall thickness of
  • the frame preferably 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.
  • the frame has a magnesium alloy, preferably a fiber-reinforced or particle-reinforced alloy, particularly preferably SAE SiC / AZ91. Particularly preferably, substantially the entire frame is made of such an alloy.
  • the frame may be locally reinforced with carbon and / or fiberglass material. Such a reinforcement is preferably provided in the region of the transition between the head section and the grip section.
  • 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.
  • Embodiment one or more components can be made separately from magnesium or a magnesium alloy, in particular injection-molded, be. These components can then be placed in a tubular shape together with the prepreg layers in a mold and pressed together with the prepreg layers. These separate components may be individual sections of the head section or handle section. Particularly preferred according to the invention, however, a separate heart area is provided, the
  • Magnesium or magnesium or magnesium alloys since can be achieved in this area with a corresponding variation of the wall thickness particularly advantageous effects.
  • the magnesium-containing frame portion is preferably made of two
  • Frame section halves that are welded together, pressed and / or glued. If the entire frame has magnesium, then preferably the entire frame consists of two frame halves which are welded together, pressed and / or glued together.
  • Frame halves or frame portion halves are preferably identical, with each of the two Frame halves or frame portion halves is formed asymmetrically with respect to the frame longitudinal axis or frame portion longitudinal axis. In this way, using the injection molding process, two identical halves can be produced in a particularly simple manner, which then interlock when connecting.
  • the present invention further relates to a method of manufacturing a frame for a ball game racket.
  • the frame produced by the method according to the invention is preferably a frame with the properties described above.
  • an injection mold and a core are provided, wherein the core preferably consists of a material with a melting temperature below the melting temperature or heat resistance temperature of the frame material.
  • the melting temperature of the core material is less than 400 ° C, more preferably less than 370 ° C. It is further preferred that the melting temperature of the
  • 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.
  • Nuclear material is chosen so that during the molding of the frame not enough heat energy is introduced into the core to melt this, with a slight softening may be tolerated.
  • the core is melted, preferably by heating the entire racket above the melting temperature of the core, such that the core material is formed from the cavity formed by the frame can escape.
  • the heat-resistant temperature of the frame is preferably not exceeded.
  • 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), zinc die cast alloys such as ZnA14, ZnA14Cul, ZnA14Cu3, alloys based on indium, glass, plastic with or without glass fiber reinforcement such as polyamide. Particularly preferred are metallic integral foam cores based on these low-melting alloys. These can be produced, for example, by die casting. The addition of a propellant results in an integral foam with closed outer skin. For example, the relative density may be 50% to 100% of the absolute
  • Material density amount is used compared to a solid core.
  • 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 by means of the so-called
  • 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 completion of the second frame section and the connection of the second frame section to the first frame section in one
  • 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 with 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 is often done manually by conventional Perpreg compiler, eliminates virtually completely. Injection molding also allows excellent production stability and allows to produce exactly the desired structure using a defined injection mold.
  • Fig. 1 is a perspective view of the frame according to the invention.
  • FIG. 2 is a perspective view of a frame half of the frame according to FIG. 1;
  • Fig. 3 is an enlarged perspective view of the heart region of the frame according to
  • Fig. 4 is a perspective view of the transition from the handle portion in the
  • FIG. 5 is a perspective view of a portion of the head portion of the frame of FIG. 2;
  • Fig. 6 is a perspective cross-section through the head portion of the frame according to
  • FIG. 1 A first figure.
  • Fig. 7 is a perspective cross-section through the bridge of the frame according to FIG.
  • Fig. 8 is a perspective longitudinal section through the handle portion of the frame
  • FIG. 9 is a plan view of a separate component for a frame according to a
  • Fig. 10 is a side view viewed from the clothing plane on the component
  • FIG. 11 is a side view of a figure 10 opposite side on the component according to Figure 9;
  • FIG. 12 shows a perspective view of the component according to FIG. 9; FIG. and
  • FIG. 13 is a further perspective view of the component according to FIG. 9.
  • Figure 1 shows a perspective view of a frame for a ball game racket according to a preferred embodiment of the present invention.
  • the frame is as
  • 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 shown in a perspective view in FIG.
  • FIG. 2 shows the asymmetry of the frame half such that the two frame halves can engage with each other during assembly.
  • FIG. 3 which shows the heart region 3 of the frame half from FIG. 2, this can be seen particularly clearly: for example, 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
  • the head portion (see Fig. 5) has portions with protruding lands 1a and step-shaped portions 1b.
  • the step forms a kind stop for the second frame half and web and stage can be welded or glued together, for example.
  • the frame halves may also, for example, projections and grooves or similar areas have, which allow the two
  • FIG. 6 shows a cross section through the frame hollow profile of the frame of FIG. 1 in the region of the head section 1.
  • the wall thickness of the hollow frame profile according to the invention can vary considerably considerably along a cross section through the frame hollow profile.
  • the illustrated preferred embodiment the
  • Cross-sectional profile can additionally vary along the frame contour in the longitudinal direction.
  • FIG. 7 shows a cross section through the hollow profile in the region of the bridge 5. Again, the wall thickness of the hollow profile varies, although the variation is not as pronounced as in the example of Figure 6.
  • FIG 8 shows a longitudinal section through the handle portion 2 of the frame of Figure 1.
  • the wall thickness of the frame hollow profile increases significantly in the region of the transition to the arm 4b.
  • the frame does not have the entire frame magnesium. Rather, according to the invention, the frame can also have a section or a separate component made of magnesium or a magnesium alloy.
  • FIG. 9 to 13 Embodiment of such a separate component of magnesium alloy is shown in Figures 9 to 13.
  • 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 use of 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 profiles can achieve the greatest effect.
  • 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. This is preferably done by the separate magnesium component is pressed with the prepreg layers of the rest of the frame in the tube blowing process.
  • injection molding can be controlled so well with the aid of the method according to the invention that even the string openings 10 for the passages of the string forming the string can be manufactured without requiring an additional step of drilling is.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

L'invention concerne un cadre de raquette pour jeux de balles comprenant une partie tête et une partie manche, le cadre présentant un profilé creux et comportant du magnésium, et l'épaisseur des parois du profilé creux variant le long d'une section transversale à travers le profilé creux du cadre. L'invention concerne également un procédé de fabrication d'une raquette de ce type.
PCT/EP2014/064300 2013-07-04 2014-07-04 Raquette en magnésium WO2015001077A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201480037997.6A CN105407987B (zh) 2013-07-04 2014-07-04 镁球拍
ES14745093T ES2758727T3 (es) 2013-07-04 2014-07-04 Raqueta de magnesio
EP14745093.6A EP3016721B1 (fr) 2013-07-04 2014-07-04 Raquette en magnésium
US14/902,412 US20170050090A1 (en) 2013-07-04 2014-07-04 Racket or club consisting of magnesium

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013011174.9 2013-07-04
DE102013011174.9A DE102013011174B4 (de) 2013-07-04 2013-07-04 Magnesiumschläger

Publications (1)

Publication Number Publication Date
WO2015001077A1 true WO2015001077A1 (fr) 2015-01-08

Family

ID=51260836

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/064300 WO2015001077A1 (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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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
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
USD1027089S1 (en) * 2021-11-19 2024-05-14 Head Technology Gmbh Racket throat

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Publication number Priority date Publication date Assignee Title
US1587919A (en) * 1922-04-26 1926-06-08 Spalding & Bros Ag Racket
US3874667A (en) 1972-08-09 1975-04-01 Nl Industries Inc Die-cast light-metal racket and stringing means therefor
WO1980002510A1 (fr) * 1979-05-17 1980-11-27 J Frolow Raquette de tennis
US6234921B1 (en) * 1999-05-05 2001-05-22 Benetton Sportsystem Usa, Inc. Sports racquets with tripod weighting
US20030054908A1 (en) * 2001-09-14 2003-03-20 Minoru Yoneyama Tennis racket with shaft having light weight metal piece

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DE1757527U (de) * 1957-09-25 1957-12-05 Fuchs Fa Otto Ballspielschlaeger, insbesondere tennisschlaeger.
US4176841A (en) * 1974-04-10 1979-12-04 Reinhold Sommer Tennis racket
US4290604A (en) * 1979-08-07 1981-09-22 Ektelon Racquetball racquet having a metal frame meshable with a throat piece
US5037097A (en) * 1988-08-18 1991-08-06 Athletic Alternatives, Inc. Sports racket
US5358261A (en) * 1993-12-16 1994-10-25 Cheng Chin Cheng Metal racket frame
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
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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1587919A (en) * 1922-04-26 1926-06-08 Spalding & Bros Ag Racket
US3874667A (en) 1972-08-09 1975-04-01 Nl Industries Inc Die-cast light-metal racket and stringing means therefor
WO1980002510A1 (fr) * 1979-05-17 1980-11-27 J Frolow Raquette de tennis
US6234921B1 (en) * 1999-05-05 2001-05-22 Benetton Sportsystem Usa, Inc. Sports racquets with tripod weighting
US20030054908A1 (en) * 2001-09-14 2003-03-20 Minoru Yoneyama Tennis racket with shaft having light weight metal piece

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
EP3016721B1 (fr) 2019-09-11
DE102013011174B4 (de) 2016-08-18
EP3016721A1 (fr) 2016-05-11
US20170050090A1 (en) 2017-02-23
CN105407987B (zh) 2019-03-15
ES2758727T3 (es) 2020-05-06
DE102013011174A1 (de) 2015-01-08
CN105407987A (zh) 2016-03-16

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