EP1473064A1 - Palette de la raquette de tennis de table et raquette de tennis de table - Google Patents

Palette de la raquette de tennis de table et raquette de tennis de table Download PDF

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Publication number
EP1473064A1
EP1473064A1 EP03292617A EP03292617A EP1473064A1 EP 1473064 A1 EP1473064 A1 EP 1473064A1 EP 03292617 A EP03292617 A EP 03292617A EP 03292617 A EP03292617 A EP 03292617A EP 1473064 A1 EP1473064 A1 EP 1473064A1
Authority
EP
European Patent Office
Prior art keywords
blade
table tennis
tennis racket
fibers
fiber sheet
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Withdrawn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
EP03292617A
Other languages
German (de)
English (en)
Inventor
Kimihiko Tamasu
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.)
Tamasu Co Ltd
Original Assignee
Tamasu 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 Tamasu Co Ltd filed Critical Tamasu Co Ltd
Publication of EP1473064A1 publication Critical patent/EP1473064A1/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Withdrawn legal-status Critical Current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
    • A63B59/00—Bats, rackets, or the like, not covered by groups A63B49/00 - A63B57/00
    • A63B59/40—Rackets or the like with flat striking surfaces for hitting a ball in the air, e.g. for table tennis
    • A63B59/42—Rackets or the like with flat striking surfaces for hitting a ball in the air, e.g. for table tennis with solid surfaces
    • A63B59/45—Rubber parts thereof; characterised by bonding between a rubber part and the racket body
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B59/00—Bats, rackets, or the like, not covered by groups A63B49/00 - A63B57/00
    • A63B59/40—Rackets or the like with flat striking surfaces for hitting a ball in the air, e.g. for table tennis
    • 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
    • A63B60/06—Handles
    • A63B60/10—Handles with means for indicating correct holding positions
    • 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
    • A63B2102/16—Table 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 blade which is a main part of a table tennis racket, as well as to a table tennis racket which comprises the blade.
  • a table tennis racket have various performances, for example, high level of repulsive force with respect to a ball hit by the racket.
  • Fig. 5A shows the table tennis racket having such a performance.
  • the table tennis racket has a blade 91 and a grip member 92 attached to an end portion of the blade 91.
  • Fig. 5B shows a cross section view of the blade 91 in the thickness direction thereof.
  • the blade 91 is formed by piling five base plates 93. Between the adjacent base plates 93, a woven material sheet 94 in the form of sheet shown in Fig. 6A is provided.
  • Fig. 6B shows the details view of the woven material sheet 94, in which a portion circled with broken line in Fig. 6A is enlarged.
  • the woven material sheet 94 is formed as textile obtained by regularly intersecting yarn of fiber material.
  • the fiber material continuous fiber such as aramid fiber or carbon fiber is used.
  • the woven material sheet 94 is hardened by thermoplastic resin in order to keep its sheet-like shape.
  • the flexural elastic modulus of the blade 91 can be increased by providing the woven material sheet 94 between the adjacent base plates 93.
  • the table tennis racket having high level of repulsive force for a ball hit by the racket.
  • the base plate 93 is formed of composite polymer material having porous structure reinforced by various types of particles, thereby changing the flexural elastic modulus.
  • the woven material sheet 94 has the structure in which continuous fibers are crossed as described above, the flexural elastic modulus cannot be greatly changed only by changing the orientation of the woven material sheet 94 with respect to the base plates 93.
  • the thickness of the fiber sheet increases at the crossings, thus increasing the thickness of the blade.
  • This increase of the blade thickness may increase the thickness of the assemble racket, or may increase the amount of adhesive used for making the woven material sheet 94 adhere to the base plate 93 so as to increase the total weight of the racket. Therefore, in some cases, the table tennis racket having satisfactory performances cannot be supplied.
  • the flexural elastic modulus cannot be greatly changed only by changing the orientation when adhering the woven material sheet 94 with respect to the base plates 93. Therefore, in a case where the thickness of the base plate 93 that forms the table tennis racket is varied to cause variation of the flexural elastic modulus, the adjustment of flexural elastic modulus may be difficult.
  • the material for the racket should be changed for each racket. Such a change can be causing a lot of trouble of manufacturing the racket, thus increasing the manufacturing cost.
  • a blade of a table tennis racket includes: a plurality of piled base plates which piled each other; and a fiber sheet provided between two adjacent ones of the plurality of base plates, wherein the fiber sheet is made of nonwoven fabric containing fibers aligned substantially unidirectionally and an angle formed by an alignment direction of the fibers and a longitudinal direction of the blade is set in accordance with flexural strength of the blade.
  • aramid fibers As material for the fibers, aramid fibers, polyarylate fibers, metal fibers, glass fibers, and carbon fibers can be used.
  • the above blade can be applied to any one of a penholder type racket and a shake-hand type racket.
  • Fig. 1 is a outline perspective view of a table tennis racket (shake-hand type) according to an embodiment of the present invention.
  • the reference numeral 11 denotes a blade of the table tennis racket.
  • This blade 11 is formed by a blade part 11a onto which a rubber sheet 12 is placed to adhere and a grip mounting part 11b which forms a grip together with a grip members 13.
  • the grip member 13 has a so-called FL flare shape in which the center of gravity is located at the top end of the grip member 13 and which fits a palm of a player who holds this racket.
  • Fig. 2A is an exploded perspective view of the blade 11.
  • An inner plate 31 serves as a base plate that defines the shape of the table tennis racket.
  • Fiber sheets 32 for increasing flexural elastic modulus of the blade 11 are placed on and adhere to both surfaces of the inner plate 31 with adhesive.
  • adhesive epoxy resin thermosetting adhesive is used.
  • an outer plate 33 is placed to adhere to the fiber sheet 32.
  • the material for the outer plate 33 obeche (Ayous), Japanese linden, Japanese cypress, Willow, and the like can be used just like the inner plate 31.
  • the adhesive for making the outer plate 33 adhere to the fiber sheet 32 epoxy resin thermosetting adhesive is used.
  • the fiber sheet 32 is formed by nonwoven fabric including fibers that are aligned substantially unidirectionally, as shown in Fig. 2B.
  • fiber material that may be light and strong in addition to excellent other properties can be used.
  • Examples of the material for the fiber sheet 32 include carbon fibers, aramid fibers, polyarylate fibers, glass fibers, metal fibers, and the like.
  • the flexural elastic modulus of the plate constituting the blade 11 is varied between the plates, the flexural elastic modulus of the blade 11 as a whole can be adjusted by changing the orientation of the fiber sheet 32 when the fiber sheet 32 is made to adhere to the inner plate 31.
  • the blade 11 having a level of flexural strength required by a player can be supplied to the player.
  • the fiber sheet 32 is nonwoven fabric in which the fibers are unidirectionally aligned.
  • the fiber sheet 32 is lighter than the conventional fiber sheet 94 in a case where both sheets 32 and 94 are made of the same material, because the fiber sheet 32 contains no crossing of the fibers. Therefore, by sandwiching the fiber sheet 32 between the inner plate 31 and the outer plate 33, the weight of the blade 11 can be reduced.
  • the fiber sheet 32 is nonwoven fabric and has no texture unlike woven fabric.
  • the possibility that the adhesive enters the texture can be eliminated and it is therefore possible to reduce the amount of the adhesive. Accordingly, the weight of the blade 11 can be reduced.
  • the fiber sheet 32 contains no crossing of the fibers.
  • the fiber sheet 32 can be made thinner than the conventional fiber sheet 94. This can reduce the thickness of the blade 11.
  • the flexural elastic modulus can be adjusted without changing the materials of the inner plate 31 and the outer plate 33 which form the blade 11.
  • the number of the outer plates 33 is two. However, the number of the outer plates 33 is not limited to two. For example, four outer plates 33 may be used.
  • the flexural elastic modulus of the blade 11 is changed.
  • the flexural elastic modulus of the blade 11 can be adjusted by changing the orientation when adhering the fiber sheet 32 with respect to the inner plate 31. Therefore, it is not necessary to carefully consider the relationship between the flexural modulus and the number of the outer plates 33, thus the freedom of design increases.
  • the shape of grip member may be formed to be AN anatomic, CO conic, or ST straight.
  • the angle formed by the longitudinal direction of the blade and the alignment direction of the fibers forming the fiber sheet is assumed to be ⁇ .
  • Fig. 3 is an exploded perspective view of a blade 21 according to this example.
  • the blade 21 is formed by one inner plate 41, two fiber sheets 42, and two outer plates 43. At the bottom of the blade 21, a pair of grip members 45 are attached.
  • the inner plate 41 is made of Ayous and has a thickness of 3.2 mm.
  • the surface of the inner plate 41 has the grain extending in a direction perpendicular to the longitudinal direction of the table tennis racket.
  • the fiber sheets 42 are placed on both surfaces of the inner plate 41 and adhere to the respective surfaces with epoxy resin thermosetting adhesive.
  • carbon fiber As the material for the fiber sheet 42, carbon fiber is used.
  • carbon fiber TORAYCA (trademark), available from Toray Industries, Inc., which is 0.22 g/m in weight per unit length is used.
  • the outer plate 43 is made of Ayous and has a thickness of 0.8 mm.
  • the surface of the outer plate 43 has the grain extending along the longitudinal direction of the table tennis racket.
  • Fig. 4A shows a cross section view of the table tennis racket in the longitudinal direction thereof
  • Fig. 4B is a top view of the table tennis racket. Note that a rubber sheet to be placed on the blade 21 is omitted in Figs. 4A and 4B.
  • the length L1 from the top end to the grip end of the table tennis racket is 260 mm.
  • the length L2 of the racket in the thickness direction at the grip end is 25 mm.
  • the length L3 of the racket in the thickness direction at the top end is 6 mm.
  • each grip member 45 is tapered toward the blade 21 so as to form a tapered portion 45a.
  • the length L4 of the tapered portion 45a in the longitudinal direction of the racket is 15 mm.
  • the portion of the grip member 45 other than the tapered portion 45a has the length L5 of 85 mm.
  • the length L6 of the racket in the thickness direction at the top end of the tapered portion 45a is 8 mm.
  • the length L7 of the racket in the lateral direction L7 is 150 mm.
  • the grip member 45 was obtained by cutting a block of plywood composed of a plurality of plies of Ayous, each of which has a thickness of 6 mm, into a grip shape.
  • the flexural elastic modulus was measured by performing flexural test for a flat rectangular plate having a size of 40 mm x 150 mm which was cut from the blade 21.
  • the flexural elastic modulus was measured by three point bending test in which the flat plate was supported at both ends in the longitudinal direction and the load was applied to the center of the flat plate in the longitudinal direction.
  • Strograph V10-C Toyo Seiki Seisaku-sho, Ltd.
  • ⁇ 0° 45° 90° Flexural elastic modulus (N/mm) 31.4 19.6 17.6
  • the flexural elastic modulus was 31.4 N/mm when ⁇ was equal to 0°; the flexural modulus was 19.6 N/mm when ⁇ was equal to 45°; and the flexural modulus was 17.6 N/mm when ⁇ was equal to 90°.
  • the flexural elastic modulus of the blade can be adjusted by changing the angle ⁇ . Therefore, it is possible to provide the blade and the table tennis racket that have a level of repulsive force required by each player.
  • the flexural elastic modulus of the blade can be changed only by adjusting the alignment direction of the fibers in the fiber sheet with respect to the base plate.
  • the blade and the table tennis racket that have a level of the repulsive force required by the player.
  • the flexural elastic modulus of the blade and the table tennis racket can be increased by arranging the fiber sheet with respect to the inner plate of the blade in such a manner that the alignment direction of the fibers in the fiber sheet is substantially parallel to the longitudinal direction of the table tennis racket.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Laminated Bodies (AREA)
EP03292617A 2003-04-30 2003-10-21 Palette de la raquette de tennis de table et raquette de tennis de table Withdrawn EP1473064A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003125708A JP2004329303A (ja) 2003-04-30 2003-04-30 卓球ラケットのブレード及び卓球ラケット
JP2003125708 2003-04-30

Publications (1)

Publication Number Publication Date
EP1473064A1 true EP1473064A1 (fr) 2004-11-03

Family

ID=32985587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03292617A Withdrawn EP1473064A1 (fr) 2003-04-30 2003-10-21 Palette de la raquette de tennis de table et raquette de tennis de table

Country Status (3)

Country Link
EP (1) EP1473064A1 (fr)
JP (1) JP2004329303A (fr)
CN (1) CN1541737A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2883483A1 (fr) * 2005-03-22 2006-09-29 Virginie Gamboa Plaques pour raquettes de tennis de table a base d'armature en renfort fibreux carbonne, aramide, verre
US20120010031A1 (en) * 2010-07-12 2012-01-12 Table Tennis Nation LLC Table tennis paddle
WO2013139856A1 (fr) * 2012-03-21 2013-09-26 Michael Schneider Élément plan pour former une partie d'un appareil de sport ou d'un instrument de musique

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102441263A (zh) * 2010-10-08 2012-05-09 王牧滋 超轻独木式乒乓球底板
JP6008504B2 (ja) * 2012-01-25 2016-10-19 セメダイン株式会社 木質積層体、この木質積層体を用いた卓球ラケット及び上記木質積層体に用いる無溶剤一液型接着剤組成物
JP6731824B2 (ja) * 2016-09-30 2020-07-29 美津濃株式会社 卓球用ラケット
WO2019030959A1 (fr) * 2017-08-07 2019-02-14 株式会社タマス Lame de raquette de tennis de table

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1436436A (en) * 1973-11-03 1976-05-19 Dunlop Ltd Table-tennis bats
GB1514625A (en) * 1975-07-24 1978-06-14 Nissei Co Ltd Table tennis bat
US4324400A (en) * 1979-08-08 1982-04-13 Est Industries, Inc. Table tennis bat blade
FR2615402A3 (fr) * 1987-05-18 1988-11-25 Dubois Jean Paul Raquette de tennis de table, en materiaux composites aramide et carbone
DE20121074U1 (de) * 2001-12-29 2002-10-24 Freund, Claudia, 09123 Chemnitz Tischtennisschläger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1436436A (en) * 1973-11-03 1976-05-19 Dunlop Ltd Table-tennis bats
GB1514625A (en) * 1975-07-24 1978-06-14 Nissei Co Ltd Table tennis bat
US4324400A (en) * 1979-08-08 1982-04-13 Est Industries, Inc. Table tennis bat blade
FR2615402A3 (fr) * 1987-05-18 1988-11-25 Dubois Jean Paul Raquette de tennis de table, en materiaux composites aramide et carbone
DE20121074U1 (de) * 2001-12-29 2002-10-24 Freund, Claudia, 09123 Chemnitz Tischtennisschläger

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2883483A1 (fr) * 2005-03-22 2006-09-29 Virginie Gamboa Plaques pour raquettes de tennis de table a base d'armature en renfort fibreux carbonne, aramide, verre
US20120010031A1 (en) * 2010-07-12 2012-01-12 Table Tennis Nation LLC Table tennis paddle
WO2013139856A1 (fr) * 2012-03-21 2013-09-26 Michael Schneider Élément plan pour former une partie d'un appareil de sport ou d'un instrument de musique

Also Published As

Publication number Publication date
JP2004329303A (ja) 2004-11-25
CN1541737A (zh) 2004-11-03

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