EP2025371A1 - Raquette pour jeux de balle - Google Patents

Raquette pour jeux de balle Download PDF

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Publication number
EP2025371A1
EP2025371A1 EP08019688A EP08019688A EP2025371A1 EP 2025371 A1 EP2025371 A1 EP 2025371A1 EP 08019688 A EP08019688 A EP 08019688A EP 08019688 A EP08019688 A EP 08019688A EP 2025371 A1 EP2025371 A1 EP 2025371A1
Authority
EP
European Patent Office
Prior art keywords
ball game
frame
racket
stiffening elements
game racket
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.)
Withdrawn
Application number
EP08019688A
Other languages
German (de)
English (en)
Inventor
Jürgen Dipl.-Ing. Wilke
Herfried Lammer
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
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
Publication of EP2025371A1 publication Critical patent/EP2025371A1/fr
Withdrawn legal-status Critical Current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
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/02—Ballast means for adjusting the centre of mass
    • 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
    • A63B49/14—Protection devices on the frame
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/54—Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations
    • 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
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B2049/0217—Frames with variable thickness of the head in the string plane

Definitions

  • the present invention relates to a racket for ball games, in particular a tennis racket, squash rackets, badminton rackets and racquetball rackets, with a frame having a head portion for receiving a string and a handle or handle portion.
  • bats often have a subsequent to the club head and in the handle portion merging heart area or a fork.
  • a beaten, d. H. a striking the clothing of the racket ball elastic deformation of the racket or an elastic displacement of the head portion from its longitudinal axis and leads to a deterioration of the accuracy.
  • Such a deflection of the club head is responsible for the direction of the ball played. Even a slight deflection of the club head can cause a significant deviation of the actual target point of the ball from the desired in a ball played over the field length.
  • the ball moves away from the bent racket. The club goes after the separation from the ball in its free damped oscillation (natural frequency) on.
  • a hit on the racket ball or a hit ball causes forces that are transmitted to the player via the racket.
  • Such forces or vibrations or shocks are, at least in the long-term effect, responsible for the player's health problems such as the so-called tennis elbow occur.
  • the US-A-5,462,274 discloses a tennis racket comprising longitudinal strings stretched in a longitudinal direction of the racket and transverse strings stretched in a transverse direction perpendicular to the longitudinal direction, the ratio of the tension of each longitudinal string to the tension of each transverse string being in the range of 2.5 / 1 to 4/1 so that a nodal line for second-order vibrations lies in the so-called sweet area, whereby the reaction of the tennis racket to an impulse by a tennis ball is to be reduced.
  • the US-A-4,997,186 discloses a racquet frame, eg for a tennis racket, having a head portion, a handle portion and a neck portion extending therebetween.
  • the head portion encloses an open area and has a plurality of string holes for attaching a string to the head portion and over the open area.
  • the heart region is in the form of a pair of legs and substantially V-shaped.
  • differing aspect ratios are provided to pre-determine the rigidity of the frame.
  • a first aspect ratio refers to the location of the maximum cross-sectional height of the racket frame in a lower portion of the head portion to provide a double reverse tapered profile along the cross-sectional height of the racket frame.
  • a second aspect ratio refers to providing a sudden transition in an inwardly facing surface of the head region of the racquet frame to provide a dual tapered conical profile along the transverse width of the head region of the racquet frame.
  • a third aspect ratio relates to changing the cross-sectional height to the cross-sectional width along the heart area of the racquet frame to provide a larger heart area height and a larger heart area width near the handle section.
  • the US-A-5,310,179 describes a tennis racket construction having an oval header area frame defining a stringing surface, wherein the longitudinal size of the stringing surface is in the range of 320 to 390 mm and the transverse length thereof is in a range of 200 to 240 mm and the longitudinal compression stiffness of the head region is at a value is set in the range of 30 to 200 kgf / mm.
  • the disclosed construction is intended to allow for the provision of greater head and cross string tensions, thereby achieving a higher degree of "spin" on shot balls.
  • the DE-A-199 53 626 describes an improved ball game racket in which a profile forming the frame at different frame positions according to the main types of stress occurring there have different cross-sectional shapes, the resistance moments adapted to the respective types of stress, wherein in the range between four and six o'clock and / or at the heart area of the racket at least one hump-like stiffening element can be provided.
  • US-A-6,293,878 describes a device for damping vibrations in a sports racquet with a first and a second elastic damping material connectable to the racket frame, and a mass accessory which is free to oscillate independently of the racket frame and has a clip arrangement.
  • the present invention is based on the object, a further improved racket, in particular an improved tennis rackets and improved Squash racket to provide.
  • Other objects of the invention are to provide a racket which overcomes the disadvantages of the prior art, which has improved stiffness or stiffness, which is simple and inexpensive to produce and / or which has improved playability. This object is achieved with the features of the claims.
  • the invention is based on the basic idea of providing a ball game racket with a frame which has a head area for receiving a clothing and a grip portion for holding the ball game racket, wherein the frame at the head area in at least two segments each have a plurality of clamps formed transversely to the frame. or rib-like stiffening elements.
  • transverse to the frame means approximately perpendicular to a longitudinal axis extending through the frame or through individual frame areas or infinitesimal frame elements.
  • a longitudinal axis approximately follows the frame contour.
  • the stiffening elements generally extend approximately radially to a circle formed by the head region, that is to say in the clothing plane, and / or perpendicular to the clothing plane.
  • the stiffening elements surround or clasp the frame at least partially and / or completely.
  • the stiffening elements allow by an optimized change of the cross-sectional profile of the racket frame in the head area a change in the vibration or damping behavior along the frame, so that an optimized vibration or damping behavior is achieved.
  • the stiffening elements cause an optimized mass distribution of the entire racket mass and an increase or change in the stiffness of the racket over the course of the racket. In this way, the playing behavior of the racket can be influenced. The player also feels subjectively a larger sweet spot.
  • the stiffening elements are arranged in at least two, preferably in four segments of the frame in the head region of the racket, each segment having a plurality of stiffening elements, preferably three to five stiffening elements.
  • the Segments are preferably provided in the range of about 3:30 to 5 o'clock and 7 o'clock to 8 o'clock 30 or in the range of 1 o'clock to 2 o'clock 30 and 9 o'clock 30 to 11 o'clock.
  • the stiffening elements within a segment have different rib widths and / or different distances from each other, wherein the width of the clamps of a segment preferably in the direction of a transverse axis extending approximately centrally through the head region of the racquet, i. in the direction of 3 o'clock or 9 o'clock, increases.
  • the width of one stiffening element relative to an adjacent stiffening element or the width of one group of stiffening elements increases relative to an adjacent group of stiffening elements, wherein the width of the individual stiffening elements or of the individual stiffening elements of a group of stiffening elements is constant.
  • one stiffening element has a greater width than a directly adjacent stiffening element and / or a smaller width than another directly adjacent stiffening element.
  • two adjacent stiffening elements have an approximately equal or equal width, wherein they in turn have a greater and / or smaller width than an adjacent group of two stiffening elements.
  • such a width change along the racket profile takes place uniformly or symmetrically with respect to the racket.
  • the individual segments preferably have a width or length of about 60 to 90 mm and more preferably a width of about 70 to 80 mm along the frame or the racket contour.
  • the width of the individual staples or ribs preferably ranges from about 2.5 to 12 mm, and more preferably from about 4.5 to 9 mm.
  • the brackets also have a distance surrounding the frame profile of about 0.25 to 1 mm, preferably about 0.5 mm.
  • the brackets have a thickness of about 0.25 to 1 mm, preferably about 0.5 mm, relative to the frame, ie, the surface of the brackets rises about 0.5 mm from the adjacent surface of the frame.
  • the racket frame thus experiences in the region of a bracket a radius extension of about 0.25 to 1 mm, preferably of at least about 0.5 mm.
  • the clip-like stiffening elements are integrally formed with the racket.
  • the brackets are preferably formed by the radius expansion of the racket frame discussed above.
  • the changes in diameter are chosen so that they do not adversely affect the transition of the frame profile to the respective clip, since if the changes are too great, the risk of breakage increases due to the deflection of the fibers contained in the frame, especially if the clamps or edges and transitions of the clips are relative are sharp-edged.
  • the edges of the cross-sectional profile of the stiffening elements are therefore preferably rounded.
  • stiffening elements in defined segments along the racket contour of the head area, among other things an increased strength or an increase and change in the stiffness of the racket along the frame course in the head area is effected, which in turn leads to an improved play behavior of the racket. Furthermore, the stiffening elements formed integrally with the racket permit simple and cost-effective production while at the same time optimizing the racket properties and the mass distribution.
  • FIGs 1 and 2 show a conventional ball game racket 2 in front and side view.
  • the ball game racket 2 has a substantially oval club head 4, a heart area 6 and a grip portion 8.
  • a recess 10 for receiving a wear frame or headband, not shown, is provided in the head region 4 of the racket 2 .
  • the heart area 6 of the racket 2 is arranged substantially between the head area 4 and the handle section 8 and represents the connection area between them.
  • the heart area 6 has, for example, as in FIG FIG. 1 shown, an opening 12. However, this opening is not mandatory. However, when the opening 12 is formed, it is generally formed by two side portions 14 and 16 and a connecting portion or bridge 18 located in the head area 4 of the racket. Further, between the two side regions 14 and 16 of the heart region 6, a second connecting element 20, for example, for reasons of strength, be provided.
  • the in the Figures 1 and 2 illustrated conventional tennis racket 2 is formed from a molded profile with substantially constant dimensions, except for the recess 10.
  • the cross-sectional shape or the cross-sectional dimensions of the profile forming the racquet frame are substantially constant from the side region 14 of the heart region 6 around the head region 4 and to the side region 16 and are substantially oval or rectangular. Only in the transition region between the heart region 6 and head region 4 or in the receiving region of the connecting element 18 does the racquet 2 have reinforced cross-sectional dimensions.
  • a preferred embodiment of a ball game racket 1 according to the invention is in the Figures 3 and 4 shown.
  • the racket 1 according to the invention essentially corresponds in its basic structure to a conventional ball game racket, as described above with reference to FIGS Figures 1 and 2 has been described.
  • the racket 1 according to the invention comprises a head area 3, a heart area 5 and a grip portion (not shown).
  • the heart area 5 of the racket according to the invention is essentially the connecting area between the head area 3 and the grip section and has, for example, an opening 7.
  • the opening 7 is formed by two side sections 9 and 11 and a connecting section or a bridge 13 in the head region 3 of the racket 1.
  • the heart region 5 of the racquet 1 according to the invention can also be counter to that in FIG FIG. 3 illustrated embodiment without the opening 7 may be formed, that is, the handle portion may extend closed to the head portion 3.
  • the connecting element or the bridge 13 is optional. Consequently, the heart region 5 may be formed only from the extensions 9 and 11 of the head portion extending toward the grip portion.
  • a second connecting element (not shown).
  • the racket 1 is based on the idea at certain points along the frame of the head area 3 of the racket 1, in particular on those segments where particularly high loads, eg in the form of static or dynamic forces and torsional or bending moments occur, provide stiffening elements in the form of ribs or brackets 15, which allow depending on the design and arrangement of a targeted influencing the strength and rigidity of the racket 1.
  • the brackets 15 are provided in the illustrated preferred embodiment in the segments 17 at about 3 o'clock 30 to 5 o'clock and 7 o'clock to 8 o'clock 30 or in the range of 1 o'clock to 2 o'clock 30 and 9 o'clock 30 to 11 o'clock.
  • the brackets in the segments 17 are arranged at about 2 o'clock, 4 o'clock, 8 o'clock and 10 o'clock.
  • the segments 17 each preferably have a width of about 60 to 90 mm and more preferably a width of about 70 to 80 mm.
  • the width of the segments 17 can also be described as a length along the circumference of the frame in the head area 3 of the racket 1.
  • the width of the individual brackets is about 2.5 to 11 mm and more preferably 4.5 to 9 mm. In the illustrated preferred embodiment, the width of the brackets in the individual segments increases in the direction of 3 o'clock and 9 o'clock, respectively.
  • the distance between the clamps 15 to each other in a preferred embodiment of the invention between 2 and 11 mm, preferably between 4 and 9 mm.
  • the brackets have different, i. Within a segment increasing and / or decreasing distances, preferably also in the direction of the increasing clip width.
  • the width and / or spacing of the individual stiffening elements or of the individual stiffening elements or of the groups of stiffening elements within one or more segments is preferably designed as described above with respect to the stiffening elements within a segment.
  • the width and / or spacing of the stiffening elements i. the individual stiffening elements or a group of stiffening elements with respect to adjacent and / or directly adjacent individual and / or groups of stiffening elements, wherein the width of and / or the distance between the individual stiffening elements or the individual stiffening elements of a group remains the same, to or from ,
  • FIGS. 4a and 4b Two corresponding preferred embodiments of the invention are in FIGS. 4a and 4b shown, where FIG. 4a a detail view of a segment in plan view and front view, and shows FIG. 4b a detail view of another segment in side view shows.
  • the illustrations clearly show that the distance 23 the stiffening elements 15 to each other in the direction of the arrow C increases. From the FIGS. 4a and 4b Furthermore, a widening of the width 21 of the individual brackets within a segment 17 in the direction of the arrow C emerges. In a preferred embodiment of the invention, the direction of the arrow C corresponds to the direction at 3 o'clock and 9 o'clock respectively.
  • the clamps are formed by a change in diameter, in particular a diameter extension relative to the frame profile of preferably 0.25 to 1.0 mm, in particular about 0.5 mm.
  • the peripheral profile of the clamps corresponds to the racket profile at the corresponding positions, wherein the clamps have a radius extension of approximately 0.5 mm circumferentially relative to the respective frame profile.
  • the clips circulate the frame profile at least partially.
  • the racket according to the invention has a recess corresponding to recess 10, as in FIG.
  • the brackets 15 are correspondingly recessed at the points of the recess 10, that is, they include the racquet profile only partially.
  • the racquet profile partially comprising brackets 15, these have no abrupt or sudden beginning and no abrupt or sudden end, but are flowing into the respective cross-sectional profile over.
  • the clamps completely revolve around the racket profile, ie extend endlessly around the frame profile.
  • FIG. 4a further shows a detailed view of a racket, which has a recess 10, wherein the stiffening elements 15 are recessed at the locations of the recess 10 accordingly.
  • the radius extension 19 formed by stiffening elements 15 decreases in the direction of the recess 10, so that the radius extension 19 is less than that over the remaining circumference of the frame profile when the stiffening element 15 passes into the recess 10 trained radius extension and in a particularly preferred embodiment of the invention is approximately 0.
  • the in FIG. 3 illustrated ball game racket according to the invention has in the segments 17 at about 2 o'clock, 4 o'clock, 8 o'clock and 10 o'clock in each case five brackets 15, the brackets 15 in each of the segments in each case in the direction of 3 or 9 clock wider (see FIGS. 4a and 4b ).
  • the brackets widen by the same value and in a further preferred embodiment according to the invention each by a corresponding ratio.
  • the brackets of an embodiment according to the invention widen by, for example, in each case half a millimeter and in accordance with a further embodiment according to the invention by in each case 10 to 30% of the width of the preceding bracket.
  • the brackets within a range only a total of a broadening, but not each clip undergoes widening compared to an adjacent clip.
  • a ball game racket according to the invention has three brackets 15 per segment and, according to a further preferred embodiment, four brackets 15.
  • the brackets are integrally formed with the frame of the racket.
  • the brackets may also have different materials, for example, to achieve additional stiffening effects.
  • the racket made of fiber composites
  • the edges and transitions of the brackets 15 are preferably rounded, so that dangerous voltage spikes in the frame can be avoided.
  • the racket 1 according to the invention as well as the arrangement and design of the clamps is also preferably substantially symmetrical with respect to a longitudinal central axis A, so that the above-described clamp segments in the region around 7 or 8 and 10 or 11 o'clock are also symmetrical to corresponding ones Positions are provided between 1 or 2 and 4 or 5 o'clock.
  • the racket 1 according to the invention and the arrangement and design of the clamps are furthermore preferably substantially symmetrical with respect to a transverse central axis B, so that the above-described clamp segments in the range of approximately one or two and ten or 11 clock are also provided symmetrically at corresponding locations between 4 or 5 and 7 or 8 clock.
  • the racket 1 according to the invention As material for the racket 1 according to the invention all known materials for tennis, squash, badminton and other rackets for ball sports are suitable.
  • the racket 1 according to the invention is made of wood, metal, metal alloys, plastic, carbon fiber composite material, fiber materials, composites and combinations thereof.
  • the invention provides a method of manufacturing a ball game racket having a head portion along which the brackets are disposed in discrete segments, and more particularly a ball game racket in accordance with the preferred embodiments described above.
  • a preferred method has the following steps: First, the layers of a plurality of layers of a material to form the frame of the racket takes place. Furthermore, the multilayer structure thus created is set in a mold having recesses or depressions at positions corresponding to the brackets of the racket, and then formed and solidified. Thereafter, the removal of the ball game racket from the mold. If the brackets are to have different material, this can additionally be introduced at the appropriate places in the mold.
  • the layers of the frame and staple forming material comprise carbon fiber composite material which is molded and consolidated under elevated temperature and / or pressure.
  • shaping and solidification take place in a press.
  • An inventive ball game racket guarantees a comparison with the known in the art rackets improved vibration or damping behavior and improved stiffness.
  • An inventive racket thus allows influencing the playing behavior. Subjectively, the player feels a bigger sweet spot.
  • the optimized mass distribution also makes it possible to provide a racket that has excellent stiffness and dynamic behavior at low overall weight.

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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)
  • Golf Clubs (AREA)
  • Laminated Bodies (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Prostheses (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
EP08019688A 2003-02-27 2004-02-26 Raquette pour jeux de balle Withdrawn EP2025371A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10308532A DE10308532B3 (de) 2003-02-27 2003-02-27 Schläger für Ballspiele
EP04004444A EP1452207B1 (fr) 2003-02-27 2004-02-26 Raquette pour jeux de balle

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP04004444A Division EP1452207B1 (fr) 2003-02-27 2004-02-26 Raquette pour jeux de balle

Publications (1)

Publication Number Publication Date
EP2025371A1 true EP2025371A1 (fr) 2009-02-18

Family

ID=32748083

Family Applications (2)

Application Number Title Priority Date Filing Date
EP04004444A Expired - Fee Related EP1452207B1 (fr) 2003-02-27 2004-02-26 Raquette pour jeux de balle
EP08019688A Withdrawn EP2025371A1 (fr) 2003-02-27 2004-02-26 Raquette pour jeux de balle

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP04004444A Expired - Fee Related EP1452207B1 (fr) 2003-02-27 2004-02-26 Raquette pour jeux de balle

Country Status (6)

Country Link
US (1) US7070525B2 (fr)
EP (2) EP1452207B1 (fr)
CN (2) CN100428969C (fr)
AT (1) ATE444783T1 (fr)
DE (2) DE10308532B3 (fr)
TW (1) TWI330538B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102133472A (zh) * 2011-03-01 2011-07-27 常延秋 柔力荡球

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Publication number Priority date Publication date Assignee Title
DE10308532B3 (de) * 2003-02-27 2004-10-21 Head Technology Ges.M.B.H. Schläger für Ballspiele
ATE438447T1 (de) 2006-02-02 2009-08-15 Head Technology Gmbh Griffband und griff für ballspielschläger
WO2007088070A2 (fr) 2006-02-02 2007-08-09 Head Technology Gmbh Raquette
DE102006004863B4 (de) * 2006-02-02 2007-12-27 Head Technology Gmbh Schläger für Ballspiele
DE102006004849B4 (de) * 2006-02-02 2008-01-03 Head Technology Gmbh Ballspielschläger mit Schwingungseinrichtung
WO2007124620A1 (fr) * 2006-04-28 2007-11-08 Chia-Yuan Chang Raquette de jeu de volant
JP2017217067A (ja) * 2016-06-03 2017-12-14 ヨネックス株式会社 ラケット、及び、グロメット
CN107187071A (zh) * 2017-05-11 2017-09-22 厦门新凯复材科技有限公司 一种实心异形球拍的生产工艺
WO2023128848A1 (fr) * 2021-12-29 2023-07-06 Evosport Ab Raquette de padel
SE546079C2 (en) * 2021-12-29 2024-05-14 Evosport Ab Padel racket with curved ribs in the frame, a mould for producing said padel racket and a method for producing said padel racket

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FR2544208A1 (fr) * 1983-04-15 1984-10-19 Rossignol Sa Club Rossignol Sk Raquette en bois
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EP0676222A1 (fr) * 1994-04-11 1995-10-11 Yoo Suk-Ho Raquette avec cadre inégal
US5462274A (en) 1993-03-09 1995-10-31 Yamaha Corporation Tennis racket with longitudinal strings different in tensile force from transversal strings
DE19953626A1 (de) 1999-11-08 2001-06-21 Head Sport Ag Schläger für Ballspiele
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EP1149607A2 (fr) * 2000-04-18 2001-10-31 EF Composite Technologies LP Raquette de sport avec cadre à surface interne ondulée

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JP2001269424A (ja) * 2000-03-27 2001-10-02 Mizuno Corp 高反発性ラケットフレーム
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Publication number Priority date Publication date Assignee Title
DE2751171A1 (de) * 1977-11-16 1979-05-17 Reppert Ruediger Lothar Von Di Schlaeger fuer ballspiele mit erhoehter schwung- und schlagkraft
FR2544208A1 (fr) * 1983-04-15 1984-10-19 Rossignol Sa Club Rossignol Sk Raquette en bois
US4997186A (en) 1989-12-08 1991-03-05 Ferrari Importing Company, Inc. Racket frame having multi-dimensional cross-sectional construction
US5310179A (en) 1991-07-29 1994-05-10 Yamaha Corporation Tennis racket
US5462274A (en) 1993-03-09 1995-10-31 Yamaha Corporation Tennis racket with longitudinal strings different in tensile force from transversal strings
EP0676222A1 (fr) * 1994-04-11 1995-10-11 Yoo Suk-Ho Raquette avec cadre inégal
US6293878B1 (en) 1998-11-30 2001-09-25 Sumitomo Rubber Industries, Ltd. Tennis racket with vibration damping member
DE19953626A1 (de) 1999-11-08 2001-06-21 Head Sport Ag Schläger für Ballspiele
EP1149607A2 (fr) * 2000-04-18 2001-10-31 EF Composite Technologies LP Raquette de sport avec cadre à surface interne ondulée

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102133472A (zh) * 2011-03-01 2011-07-27 常延秋 柔力荡球

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EP1452207B1 (fr) 2009-10-07
DE10308532B3 (de) 2004-10-21
CN101428174A (zh) 2009-05-13
TWI330538B (en) 2010-09-21
CN100428969C (zh) 2008-10-29
EP1452207A1 (fr) 2004-09-01
TW200422074A (en) 2004-11-01
ATE444783T1 (de) 2009-10-15
US7070525B2 (en) 2006-07-04
DE502004010183D1 (de) 2009-11-19
CN1533815A (zh) 2004-10-06
US20040229719A1 (en) 2004-11-18

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