EP2762205A1 - Cadre de raquette - Google Patents

Cadre de raquette Download PDF

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Publication number
EP2762205A1
EP2762205A1 EP14152466.0A EP14152466A EP2762205A1 EP 2762205 A1 EP2762205 A1 EP 2762205A1 EP 14152466 A EP14152466 A EP 14152466A EP 2762205 A1 EP2762205 A1 EP 2762205A1
Authority
EP
European Patent Office
Prior art keywords
reinforcing layer
prepreg
elastic modulus
gpa
racket frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14152466.0A
Other languages
German (de)
English (en)
Other versions
EP2762205B1 (fr
Inventor
Yosuke Yamamoto
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.)
Dunlop Sports Co Ltd
Original Assignee
Dunlop Sports Co Ltd
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 Dunlop Sports Co Ltd filed Critical Dunlop Sports Co Ltd
Publication of EP2762205A1 publication Critical patent/EP2762205A1/fr
Application granted granted Critical
Publication of EP2762205B1 publication Critical patent/EP2762205B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B49/022—String guides on frames, e.g. grommets
    • 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
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • 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
    • 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
    • A63B2209/023—Long, oriented fibres, e.g. wound filaments, woven fabrics, mats

Definitions

  • the present invention relates to racket frames used for tennis and the like. Specifically, the present invention relates to improvement of reinforcing layers for gut grooves of racket frames.
  • the frame of a tennis racket is formed from a fiber reinforced resin.
  • the matrix resin of the fiber reinforced resin is an epoxy resin.
  • the reinforcing fibers of the fiber reinforced resin are carbon fibers.
  • the reinforcing fibers are long fibers.
  • the frame is formed by winding a plurality of prepregs and curing the epoxy resin included in each prepreg.
  • a racket frame formed from a fiber reinforced resin is disclosed in JP2011-15885 .
  • a racket frame has a gut groove. A portion of a string that is located at an outer side of the frame is received in the gut groove. Damage of the string is prevented by the gut groove.
  • a general frame includes a reinforcing layer.
  • the reinforcing layer is formed from a matrix resin and a large number of carbon fibers extending in substantially a thickness direction.
  • a great force is applied to a gut groove through a string. Breakage of the frame caused by the force is prevented by the reinforcing layer.
  • the ball When a ball is hit at or near the sweet spot of a racket, the ball is launched at a high speed. When the ball is hit at or near the sweet spot of the racket, the impact force transmitted to the player is small.
  • An object of the present invention is to provide a racket frame which is excellent in resilience when a ball is hit at a position away from the sweet spot of a racket.
  • a racket frame according to the present invention includes a head formed from a fiber reinforced resin.
  • the head includes a reinforcing layer for a gut groove.
  • the reinforcing layer is formed from a prepreg including fibers and a matrix resin.
  • a compressive elastic modulus of the prepreg is equal to or less than 100 GPa.
  • a tensile elastic modulus of the prepreg is equal to or less than 100 GPa.
  • a racket frame includes a head formed from a fiber reinforced resin.
  • the head includes a reinforcing layer for a gut groove.
  • the reinforcing layer is formed from a prepreg including fibers and a matrix resin.
  • a tensile elastic modulus of the fibers is equal to or less than 160 GPa.
  • a racket frame includes a head formed from a fiber reinforced resin.
  • the head includes a reinforcing layer for a gut groove.
  • the reinforcing layer includes amorphous carbon fibers and a matrix resin.
  • a resilience coefficient is high when a ball is hit at a position away from the sweet spot.
  • the frame is excellent in operability when a ball is hit at a position away from the sweet spot.
  • a racket frame 2 shown in FIGS. 1 and 2 includes a head 4, two throats 6, a shaft 8, and a grip 10.
  • a grommet, a grip tape, an end cap, and the like are attached to the racket frame 2, and a string is stretched on the racket frame 2, whereby a racket for regulation-ball tennis is obtained.
  • the up-down direction is the axial direction of the racket frame 2
  • the right-left direction is the width direction of the racket frame 2.
  • the racket frame 2 is formed from a fiber reinforced resin.
  • the matrix resin of the fiber reinforced resin is a thermosetting resin.
  • the thermosetting resin is typically an epoxy resin.
  • the fibers of the fiber reinforced resin are typically carbon fibers.
  • the fibers are long fibers.
  • the racket frame 2 is hollow.
  • the racket frame 2 is formed by winding a plurality of prepregs and curing the thermosetting resin included in the prepregs.
  • the head 4 forms the contour of a ball-hitting face.
  • the front shape of the head 4 is substantially an ellipse.
  • the major axis direction of the ellipse coincides with the axial direction of the racket frame 2.
  • the minor axis direction of the ellipse coincides with the width direction of the racket frame 2.
  • One end of each throat 6 is connected to the head 4.
  • Each throat 6 is connected at the vicinity of the other end thereof to the other throat 6.
  • the throats 6 extend from the head 4 to the shaft 8.
  • the shaft 8 extends from the location where the two throats 6 are connected to each other.
  • the shaft 8 is formed so as to be integrally connected to the throats 6.
  • the grip 10 is formed so as to be integrally connected to the shaft 8.
  • a portion of the head 4 that is sandwiched between the two throats 6 is a yoke 12.
  • the head 4 includes a top reinforcing layer 14, a yoke reinforcing layer 16, and two side reinforcing layers 18.
  • a reference sign P1 indicates a boundary point between the top reinforcing layer 14 and each side reinforcing layer 18, and a reference sign P2 indicates a boundary point between the yoke reinforcing layer 16 and each side reinforcing layer 18.
  • FIG. 3 is an enlarged cross-sectional view taken along a line III-III in FIG. 1 .
  • FIG. 4 is a cross-sectional view taken along a line IV-IV in FIG. 3 .
  • the left side is the outer side of the head 4, and the right side is the inner side of the head 4.
  • the head 4 has a gut groove 20.
  • the gut groove 20 is formed on an outer surface of the head 4.
  • the gut groove 20 has two side surfaces 22 and one bottom surface 24.
  • the gut groove 20 extends along the circumferential direction of the head 4.
  • FIGS. 3 and 4 show the side reinforcing layer 18.
  • the side reinforcing layer 18 is formed from a prepreg.
  • the matrix resin of the prepreg is an epoxy resin.
  • the prepreg includes a large number of carbon fibers. Each carbon fiber extends in substantially the thickness direction of the racket frame 2 (the right-left direction in FIG. 2 ).
  • the side reinforcing layer 18 is formed by heating the prepreg to cure the epoxy resin.
  • the top reinforcing layer 14 and the yoke reinforcing layer 16 are formed by curing epoxy resins of other prepregs.
  • FIG. 5 shows the head 4 together with a grommet 26 and a string 28.
  • the grommet 26 includes a flange 30 and a pipe 32.
  • the flange 30 is in contact with the bottom surface 24 of the gut groove 20.
  • the pipe 32 extends through the head 4.
  • a portion of the string 28 is arranged on the flange 30 and along the circumferential direction. In addition, the string 28 extends through the pipe 32.
  • the side reinforcing layer 18 is arranged so as to surround the gut groove 20. Near the bottom surface 24 of the gut groove 20, the carbon fibers of the side reinforcing layer 18 extend in the thickness direction of the racket frame 2. The side reinforcing layer 18 reinforces the gut groove 20. The side reinforcing layer 18 prevents breakage of the head 4 when a tennis ball is hit with the racket.
  • the carbon fibers of the top reinforcing layer 14 and the yoke reinforcing layer 16 also extend in the thickness direction of the racket frame 2 near the bottom surface 24 of the gut groove 20. The top reinforcing layer 14 and the yoke reinforcing layer 16 also prevent breakage of the head 4 when a tennis ball is hit with the racket.
  • the compressive elastic modulus of the prepreg of the side reinforcing layer 18 is lower than the compressive elastic modulus of a prepreg of a reinforcing layer of an existing racket frame.
  • the head 4 including the side reinforcing layer 18 is excellent in deformability.
  • the string 28 When a tennis ball is hit at or near the sweet spot, the string 28 sufficiently stretches. By the stretch, the impact is absorbed. After the stretch, the string 28 returns to its original shape. By the return, the tennis ball is launched at a high speed.
  • deformation of the head 4 compensates for insufficient deformation of the string 28 when a tennis ball is hit at a position away from the sweet spot.
  • the racket frame 2 is excellent in impact absorption, operability, and resilience when a tennis ball is hit at a position away from the sweet spot.
  • the sweet area of the racket frame 2 is wide.
  • the compressive elastic modulus of the prepreg of the top reinforcing layer 14 is higher than the compressive elastic modulus of the prepreg of each side reinforcing layer 18, and the compressive elastic modulus of the prepreg of the yoke reinforcing layer 16 is higher than the compressive elastic modulus of the prepreg of each side reinforcing layer 18.
  • the compressive elastic modulus of the prepreg of the top reinforcing layer 14 may be equal to the compressive elastic modulus of the prepreg of each side reinforcing layer 18.
  • the compressive elastic modulus of the prepreg of the yoke reinforcing layer 16 may be equal to the compressive elastic modulus of the prepreg of each side reinforcing layer 18.
  • Longitudinal strings and lateral strings are formed from the string 28.
  • the front shape of the head 4 is substantially an ellipse, and the major axis direction of the ellipse coincides with the axial direction of the racket frame 2. Therefore, the length of the average longitudinal string is larger than the length of the average lateral string. In general, the longitudinal strings stretch more easily than the lateral strings.
  • a prepreg having a low compressive elastic modulus is used for each side reinforcing layer 18; a prepreg having a high compressive elastic modulus is used for the top reinforcing layer 14; and a prepreg having a high compressive elastic modulus is used for the yoke reinforcing layer 16.
  • the ratio of the compressive elastic modulus of the prepreg of each side reinforcing layer 18 to the compressive elastic modulus of the prepreg of the top reinforcing layer 14 is preferably equal to or less than 75%, more preferably equal to or less than 50%, and particularly preferably equal to or less than 25%. In light of strength of the racket frame 2, the ratio is preferably equal to or greater than 10%.
  • the ratio of the compressive elastic modulus of the prepreg of each side reinforcing layer 18 to the compressive elastic modulus of the prepreg of the yoke reinforcing layer 16 is preferably equal to or less than 75%, more preferably equal to or less than 50%, and particularly preferably equal to or less than 25%. In light of strength of the racket frame 2, the ratio is preferably equal to or greater than 10%.
  • the compressive elastic modulus of the prepreg of each side reinforcing layer 18 is preferably equal to or less than 100 GPa, more preferably equal to or less than 65 GPa, and particularly preferably equal to or less than 35 GPa. In light of strength of the racket frame 2, the compressive elastic modulus is preferably equal to or greater than 10 GPa. The compressive elastic modulus is measured according to the standards of "JIS K 7076".
  • a prepreg having a low compressive elastic modulus can be obtained by incorporating carbon fibers having a low tensile elastic modulus.
  • a specific example of carbon fibers having a low tensile elastic modulus is amorphous carbon fibers.
  • a prepreg having a low compressive elastic modulus may also be obtained by setting a fiber area weight (FAW) of the carbon fibers to be small.
  • carbon fibers suitable for each side reinforcing layer 18 include trade names “XN-05”, “XN-10”, and “XN-15” manufactured by Nippon Graphite Fiber Co., Ltd.
  • a particularly preferable carbon fiber is "XN-05”.
  • the tensile elastic modulus of the prepreg of each side reinforcing layer 18 is preferably equal to or less than 100 GPa, more preferably equal to or less than 75 GPa, and particularly preferably equal to or less than 35 GPa. In light of strength of the racket frame 2, the tensile elastic modulus is preferably equal to or greater than 10 GPa. The tensile elastic modulus is measured according to the standards of "JIS K 7073".
  • the tensile elastic modulus of the carbon fibers of each side reinforcing layer 18 is preferably equal to or less than 160 GPa, more preferably equal to or less than 120 GPa, and particularly preferably equal to or less than 60 GPa. In light of strength of the racket frame 2, the tensile elastic modulus is preferably equal to or greater than 20 GPa. The tensile elastic modulus of the carbon fibers is measured according to the standards of "JIS L 1069".
  • the carbon fibers of each side reinforcing layer 18 may be of a pitch-type or a PAN-type. In light of impact absorption, operability, and resilience, pitch-type carbon fibers are preferred.
  • the prepreg of each side reinforcing layer 18 may include fibers other than the carbon fibers.
  • the prepreg may include a thermosetting resin other than the epoxy resin.
  • a portion of the racket frame 2 other than the reinforcing layers 14, 16, and 18 is also formed from a prepreg.
  • the compressive elastic modulus of the prepreg is preferably higher than the compressive elastic modulus of the prepreg of each side reinforcing layer 18.
  • the compressive elastic modulus of the prepreg of the portion other than the reinforcing layers 14, 16, and 18 is preferably equal to or greater than 110 GPa and particularly preferably equal to or greater than 130 GPa.
  • a reference sign Pmax indicates a point at which the width of the racket frame 2 is at its maximum.
  • An arrow L1 indicates the distance in the axial direction between a top-side end P1 of the side reinforcing layer 18 and the point Pmax.
  • An arrow L2 indicates the distance in the axial direction between a yoke-side end P2 of the side reinforcing layer 18 and the point Pmax.
  • the distance L1 is preferably equal to or greater than 4 cm, more preferably equal to or greater than 6 cm, and particularly preferably equal to or greater than 8 cm.
  • the distance L1 is preferably equal to or less than 15 cm.
  • the distance L2 is preferably equal to or greater than 4 cm, more preferably equal to or greater than 6 cm, and particularly preferably equal to or greater than 8 cm.
  • the distance L2 is preferably equal to or less than 15 cm.
  • each side reinforcing layer 18 is located at the outer side of the center of the thickness. In other words, each side reinforcing layer 18 is located near the bottom surface 24 of the gut groove 20. Each side reinforcing layer 18 contributes to deformation of the head 4.
  • an arrow T1 indicates the thickness of the head 4
  • an arrow T2 indicates the thickness from the bottom surface 24 of the gut groove 20 to the side reinforcing layer 18.
  • the ratio of the thickness T2 to the thickness T1 is preferably equal to or less than 50%, more preferably equal to or less than 40%, and particularly preferably equal to or less than 30%. The ratio may be zero.
  • the racket frame shown in FIGS. 1 to 4 was produced.
  • the compressive elastic modulus of each prepreg used for the racket frame is as follows.
  • the tensile elastic modulus of the carbon fibers of the prepreg of each side reinforcing layer is 54 GPa.
  • the fiber area weight of the carbon fibers in the prepreg is 100 g/m 2 .
  • a racket frame of Example 2 was obtained in the same manner as Example 1, except a prepreg having a compressive elastic modulus of 64 GPa was used for each side reinforcing layer.
  • the tensile elastic modulus of the carbon fibers of the prepreg is 110 GPa.
  • the fiber area weight of the carbon fibers in the prepreg is 100 g/m 2 .
  • a racket frame of Example 3 was obtained in the same manner as Example 1, except a prepreg having a compressive elastic modulus of 85 GPa was used for each side reinforcing layer.
  • the tensile elastic modulus of the carbon fibers of the prepreg is 155 GPa.
  • the fiber area weight of the carbon fibers in the prepreg is 100 g/m 2 .
  • a racket frame of Comparative Example 1 was obtained in the same manner as Example 1, except a prepreg having a compressive elastic modulus of 129 GPa was used for each side reinforcing layer.
  • the tensile elastic modulus of the carbon fibers of the prepreg is 230 GPa.
  • the fiber area weight of the carbon fibers in the prepreg is 100 g/m 2 .
  • a racket frame of Example 4 was obtained in the same manner as Comparative Example 1, except the fiber area weight of the carbon fibers in the prepreg was 70 g/m 2 .
  • the tensile elastic modulus of the carbon fibers of the prepreg is 230 GPa.
  • a grommet, a grip tape, an end cap, and a string were mounted to each racket frame to produce a tennis racket.
  • the tennis racket was fixed, a tennis ball of a speed of 30 m/s was caused to hit at each of first to eighteenth points on a ball-hitting face, and a resilience coefficient was measured.
  • the coordinate (X, y) of each point is as follows.
  • the origin for the coordinates is at the top of the ball-hitting face
  • x is a distance (cm) in the width direction from the origin
  • y is the distance (cm) in the axial direction from the origin.
  • the average e1 of the resilience coefficients at the first to seventh points, the average e2 of the resilience coefficients at the eighth to thirteenth points, and the average e3 of the resilience coefficients at the fourteenth to eighteenth points were calculated. The results are shown in Table 1 below. Table 1 Results of Evaluation Example 1 Example 2 Example 3 Example 4 Comp.
  • Example 1 Fiber Tensile elastic modulus (GPa) 54 110 155 230 230 Prepreg FAW (g/m 2 ) 100 100 100 70 100 Tensile elastic modulus (GPa) 34 72 93 95 137 Compressive elastic modulus (GPa) 32 64 85 90 129 e1 0.38 0.38 0.38 0.38 e2 0.33 0.33 0.32 0.32 0.31 e3 0.23 0.22 0.22 0.22 0.21

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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)
  • Reinforced Plastic Materials (AREA)
  • Golf Clubs (AREA)
  • Laminated Bodies (AREA)
EP14152466.0A 2013-01-31 2014-01-24 Cadre de raquette Active EP2762205B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2013016360A JP6053539B2 (ja) 2013-01-31 2013-01-31 ラケットフレーム

Publications (2)

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EP2762205A1 true EP2762205A1 (fr) 2014-08-06
EP2762205B1 EP2762205B1 (fr) 2016-09-07

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EP (1) EP2762205B1 (fr)
JP (1) JP6053539B2 (fr)
CN (1) CN103961849B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10561907B2 (en) 2017-12-15 2020-02-18 SUMlTOMO RUBBER INDUSTRIES, LTD. Racket frame

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106512350A (zh) * 2017-01-11 2017-03-22 盐城工学院 一种网球拍框体及网球拍
TWI617429B (zh) * 2017-09-22 2018-03-11 Topkey Corp 具吸震性之複合材料結構
JP6906091B1 (ja) * 2020-07-20 2021-07-21 株式会社ゴーセン ラケット用グロメット及びこれを装着したラケット

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4436305A (en) * 1981-08-26 1984-03-13 American Sports Equipment Composite reinforced racket structure
EP0290424A2 (fr) * 1987-05-05 1988-11-09 Fischer Gesellschaft M.B.H. Cadre de raquette
WO1991012857A2 (fr) * 1990-02-21 1991-09-05 Scheruebl Franz Raquette anti-vibrations
US20050119075A1 (en) * 2003-11-27 2005-06-02 Sumitomo Rubber Industries, Ltd. Racket frame
JP2011015885A (ja) 2009-07-10 2011-01-27 Sri Sports Ltd ラケットフレーム
CN102188801A (zh) * 2010-03-15 2011-09-21 刘勇 一种减震增弹的网球拍、壁球拍或羽毛球拍
EP2550997A2 (fr) * 2011-07-25 2013-01-30 Dunlop Sports Co., Ltd. Cadre de raquette

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JPH09108385A (ja) * 1995-10-19 1997-04-28 Yamaha Corp ラケットフレーム
JPH1118631A (ja) * 1997-06-30 1999-01-26 Daiwa Seiko Inc スポーツ用品用部材
CN2316982Y (zh) * 1998-03-02 1999-05-05 生力旺兴业股份有限公司 改良球拍框架
JPH11262546A (ja) * 1998-03-17 1999-09-28 Mizuno Corp ラケットフレーム
JP3474792B2 (ja) * 1998-12-18 2003-12-08 美津濃株式会社 ラケットフレーム
JP4041031B2 (ja) * 2003-07-04 2008-01-30 Ｓｒｉスポーツ株式会社 ラケットフレーム

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4436305A (en) * 1981-08-26 1984-03-13 American Sports Equipment Composite reinforced racket structure
EP0290424A2 (fr) * 1987-05-05 1988-11-09 Fischer Gesellschaft M.B.H. Cadre de raquette
WO1991012857A2 (fr) * 1990-02-21 1991-09-05 Scheruebl Franz Raquette anti-vibrations
US20050119075A1 (en) * 2003-11-27 2005-06-02 Sumitomo Rubber Industries, Ltd. Racket frame
JP2011015885A (ja) 2009-07-10 2011-01-27 Sri Sports Ltd ラケットフレーム
CN102188801A (zh) * 2010-03-15 2011-09-21 刘勇 一种减震增弹的网球拍、壁球拍或羽毛球拍
EP2550997A2 (fr) * 2011-07-25 2013-01-30 Dunlop Sports Co., Ltd. Cadre de raquette

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
L. G. RUDENKO, F. I. SHOKOL, M. P. NOSOV: "EVALUATING THE ELASTIC PROPERTIES OF TENNIS STRINGS", 1991, XP002722680, Retrieved from the Internet <URL:http://download.springer.com/static/pdf/691/art%253A10.1007%252FBF00632899.pdf?auth66=1396604036_2e94510793308888f1992292e9bbaf54&ext=.pdf> [retrieved on 20140402] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10561907B2 (en) 2017-12-15 2020-02-18 SUMlTOMO RUBBER INDUSTRIES, LTD. Racket frame

Also Published As

Publication number Publication date
CN103961849A (zh) 2014-08-06
JP6053539B2 (ja) 2016-12-27
EP2762205B1 (fr) 2016-09-07
CN103961849B (zh) 2016-08-17
JP2014147430A (ja) 2014-08-21

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