WO2021166519A1 - バドミントンラケット - Google Patents

バドミントンラケット Download PDF

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Publication number
WO2021166519A1
WO2021166519A1 PCT/JP2021/001553 JP2021001553W WO2021166519A1 WO 2021166519 A1 WO2021166519 A1 WO 2021166519A1 JP 2021001553 W JP2021001553 W JP 2021001553W WO 2021166519 A1 WO2021166519 A1 WO 2021166519A1
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WO
WIPO (PCT)
Prior art keywords
shaft
measurement point
flexural rigidity
rigidity value
sheet
Prior art date
Application number
PCT/JP2021/001553
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
渉 君塚
Original Assignee
住友ゴム工業株式会社
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 住友ゴム工業株式会社 filed Critical 住友ゴム工業株式会社
Priority to EP21756867.4A priority Critical patent/EP4098332A4/de
Publication of WO2021166519A1 publication Critical patent/WO2021166519A1/ja

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    • 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
    • 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
    • A63B60/0081—Substantially flexible shafts; Hinged shafts
    • 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
    • A63B2102/04—Badminton
    • 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
    • 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
    • A63B60/42—Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand

Definitions

  • the present invention relates to a badminton racket.
  • the present invention relates to improvements to the shaft of this racket.
  • the badminton racket has a frame, string and shaft.
  • the player shoots the shuttle with a racket. At the time of shot, the shaft is deformed.
  • Japanese Unexamined Patent Publication No. 2001-70481 discloses a racket having a shaft including two tubes made of different materials from each other.
  • the player makes various types of shots.
  • the player makes shots such as smash, lobing, cut, and clear.
  • Smash is a shot that moves the shuttle to the opponent's court in a short time.
  • players need the skill to fly the shuttle at high speed.
  • Smash-heavy players want the shuttle to fly at high speeds.
  • An object of the present invention is to provide a badminton racket suitable for a shot in which the shaft bends significantly in both the in-plane direction and the out-of-plane direction.
  • the badminton racket is grip, A shaft with a grip inserted near its bad end, And a frame mounted near the tip end of the shaft.
  • the flexural rigidity value EI (2) of the shaft at the second measurement point where the distance from the grip is 75 mm is the flexural rigidity value EI (1) of the shaft at the first measurement point where the distance from the grip is 35 mm, and the flexural rigidity value EI (1) from the grip. It is smaller than the flexural rigidity value EI (4) of the shaft at the fourth measurement point where the distance is 155 mm.
  • the flexural rigidity value EI (3) of the shaft at the third measurement point where the distance from the grip is 115 mm is smaller than the flexural rigidity value EI (1) and the flexural rigidity value EI (4).
  • the ratio of the flexural rigidity value EI (2) to the flexural rigidity value EI (1) is 0.95 or less.
  • the ratio of the flexural rigidity value EI (2) to the flexural rigidity value EI (4) is 0.95 or less.
  • the ratio of the flexural rigidity value EI (3) to the flexural rigidity value EI (1) is 0.95 or less.
  • the ratio of the flexural rigidity value EI (3) to the flexural rigidity value EI (4) is 0.95 or less.
  • the difference between the flexural rigidity value EI (2) and the flexural rigidity value EI (1) is ⁇ 0.30 Nm 2 or less.
  • the difference between the flexural rigidity value EI (2) and the flexural rigidity value EI (4) is ⁇ 0.30 Nm 2 or less.
  • the difference between the flexural rigidity value EI (3) and the flexural rigidity value EI (1) is ⁇ 0.30 Nm 2 or less.
  • the difference between the flexural rigidity value EI (3) and the flexural rigidity value EI (4) is ⁇ 0.30 Nm 2 or less.
  • the shaft may have a hollow structure.
  • the inner diameter of the shaft from the first measurement point to the fourth measurement point is substantially uniform.
  • the outer diameter of the shaft from the first measurement point to the fourth measurement point is substantially uniform.
  • the ratio (W2 / W1) of the mass W2 of the shaft from the second measurement point to the third measurement point and the mass W1 of the shaft from the first measurement point to the second measurement point is 0.95 or more. It is 1.05 or less.
  • the ratio (W2 / W3) of the mass W2 of the shaft from the second measurement point to the third measurement point and the mass W3 of the shaft from the third measurement point to the fourth measurement point is 0.95 or more and 1 It is 0.05 or less.
  • the shaft (1) A fiber reinforced layer containing a plurality of reinforcing fibers arranged in a zone containing a first measurement point and not including a third measurement point in the axial direction and substantially axially oriented, and (2) a shaft. It has another fiber reinforced layer that is located in a zone that does not include a second measurement point in the direction and contains a fourth measurement point, and that contains a plurality of reinforcing fibers that are substantially axially oriented.
  • a player using a badminton racket according to the present invention can easily perform a shot in which the shaft is greatly bent in both the in-plane direction and the out-of-plane direction. This racket can contribute to the victory of the game.
  • FIG. 1 is a front view showing a badminton racket according to an embodiment of the present invention.
  • FIG. 2 is a right side view showing the racket of FIG.
  • FIG. 3 is an enlarged cross-sectional view showing a part of the shaft of the racket of FIG.
  • FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV of FIG.
  • FIG. 5 is a developed view showing a prepreg for the shaft of the racket of FIG.
  • FIG. 6 is a schematic view showing a method of measuring the flexural rigidity value EI of the shaft of the racket of FIG.
  • FIG. 7 is a graph showing the flexural rigidity distribution of the shaft of the racket of FIG. FIG.
  • FIG. 8 is a graph showing the flexural rigidity distribution of the racket shaft according to the comparative example.
  • FIG. 9 is a graph showing the flexural rigidity distribution of the racket shaft according to the second embodiment of the present invention.
  • FIG. 10 is a graph showing the flexural rigidity distribution of the racket shaft according to the third embodiment of the present invention.
  • FIGS. 1 and 2 Badminton racket 2 is shown in FIGS. 1 and 2.
  • the racket 2 has a shaft 4, a frame 6, a grip 8, and a string 10.
  • the arrow X represents the width direction
  • the arrow Y represents the axial direction
  • the arrow Z represents the thickness direction.
  • the shaft 4 has a bad portion 12, a middle portion 14, and a tip portion 16.
  • the shaft 4 further has a bad end 18 and a tip end 20.
  • the shaft 4 is hollow.
  • the shaft 4 is made of a fiber reinforced resin. This fiber reinforced resin has a resin matrix and a large number of reinforcing fibers.
  • the shaft 4 includes a plurality of fiber reinforced layers (described in detail later).
  • thermosetting resins such as epoxy resin, pismareimide resin, polyimide and phenol resin; and polyether ether ketone, polyether sulfone, polyetherimide, polyphenylene sulfide, polyamide and polypropylene.
  • Thermoplastic resin is exemplified.
  • a resin particularly suitable for the shaft 4 is an epoxy resin.
  • Examples of the reinforcing fibers of the shaft 4 include carbon fibers, metal fibers, glass fibers and aramid fibers.
  • a fiber particularly suitable for the shaft 4 is carbon fiber. Multiple types of fibers may be used in combination.
  • the frame 6 is annular and hollow.
  • the frame 6 is made of a fiber reinforced resin.
  • a resin similar to the base resin of the shaft 4 can be used.
  • a fiber similar to the reinforcing fiber of the shaft 4 can be used.
  • the frame 6 is tightly coupled to the tip end 20 of the shaft 4.
  • the grip 8 has a hole 21 extending in the axial direction (Y direction). The vicinity of the bad end 18 of the shaft 4 is inserted into the hole 21. The inner peripheral surface of the hole 21 and the outer peripheral surface of the shaft 4 are joined with an adhesive.
  • the string 10 is stretched on the frame 6.
  • the string 10 is stretched along the width direction X and the axial direction Y.
  • the portion of the string 10 extending along the width direction X is referred to as a horizontal thread 22.
  • the portion of the string 10 extending along the axial direction Y is referred to as a vertical thread 24.
  • the face 26 is formed by the plurality of horizontal threads 22 and the plurality of vertical threads 24. The face 26 is generally along the XY plane.
  • reference numeral L is the length of the exposed portion of the shaft 4.
  • the length L is usually 150 mm or more and 210 mm or less.
  • FIG. 3 is an enlarged cross-sectional view showing a part of the shaft 4 of the racket 2 of FIG.
  • FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV of FIG.
  • the shaft 4 is hollow.
  • the cross-sectional shape of the shaft 4 is a circle. In other words, the shaft 4 has a cylindrical shape.
  • the arrow Di represents the inner diameter of the shaft 4.
  • a typical inner diameter Di is 3 mm or more and 10 mm or less.
  • the arrow Do represents the outer diameter of the shaft 4.
  • a typical outer diameter Do is 5 mm or more and 15 mm or less.
  • the shaft 4 is made of fiber reinforced resin.
  • the shaft 4 can be manufactured by a sheet winding method. In this sheet winding method, multiple prepregs are wrapped around the mandrel. Each prepreg has a plurality of fibers and a matrix resin. This matrix resin is not cured.
  • FIG. 5 is a development view showing a prepreg configuration for the shaft 4 of the racket 2 of FIG.
  • This prepreg configuration has 11 prepregs (sheets).
  • this prepreg configuration includes a first sheet S1, a second sheet S2, a third sheet S3, a fourth sheet S4, a fifth sheet S5, a sixth sheet S6, a seventh sheet S7, and an eighth sheet S8. It has a ninth sheet S9, a tenth sheet S10, and an eleventh sheet S11. From these prepregs, a plurality of fiber reinforcing layers are formed by a method described later.
  • the first fiber reinforcing layer is formed from the first sheet S1
  • the second fiber reinforcing layer is formed from the second sheet S2
  • the third fiber reinforcing layer is formed from the third sheet S3, and the fourth sheet.
  • the fourth fiber reinforcing layer is formed from S4
  • the fifth fiber reinforcing layer is formed from the fifth sheet S5
  • the sixth fiber reinforcing layer is formed from the sixth sheet S6,
  • the seventh fiber reinforcing layer is formed from the seventh sheet S7.
  • the eighth fiber reinforcing layer is formed from the eighth sheet S8, the ninth fiber reinforcing layer is formed from the ninth sheet S9
  • the tenth fiber reinforcing layer is formed from the tenth sheet S10
  • the eleventh sheet S11 is formed.
  • the eleventh fiber reinforced layer is formed from.
  • the left-right direction in FIG. 5 is the axial direction of the shaft 4.
  • the positions of the bad end 18 and the chip end 20 are indicated by arrows.
  • the positions of the four measurement points P1, P2, P3 and P4, which will be described later, are indicated by arrows.
  • the scale in the left-right direction (axial direction) does not match the scale in the up-down direction.
  • the first sheet S1 exists over the entire shaft 4.
  • the shape of the first sheet S1 is substantially rectangular.
  • the first sheet S1 contains a plurality of carbon fibers arranged in parallel.
  • the extending direction of each carbon fiber is inclined with respect to the axial direction.
  • the angle of the extending direction of the carbon fibers with respect to the axial direction is 30 ° or more and 60 ° or less. In this embodiment, this angle is 45 °.
  • the first sheet S1 has a width of 95 mm and a length of 340 mm.
  • the second sheet S2 exists over the entire shaft 4.
  • the shape of the second sheet S2 is substantially rectangular.
  • the second sheet S2 contains a plurality of carbon fibers arranged in parallel.
  • the extending direction of each carbon fiber is inclined with respect to the axial direction.
  • the angle of the extending direction of the carbon fibers with respect to the axial direction is ⁇ 60 ° or more and ⁇ 30 ° or less. In this embodiment, this angle is ⁇ 45 °.
  • the second sheet S2 has a width of 95 mm and a length of 340 mm.
  • the inclination direction of the carbon fibers in the second sheet S2 is opposite to the inclination direction of the carbon fibers in the first sheet S1. Therefore, the inclination direction of the carbon fibers in the second fiber reinforcing layer is opposite to the inclination direction of the carbon fibers in the first fiber reinforcing layer.
  • a bias structure is achieved by the first fiber reinforced layer and the second fiber reinforced layer.
  • the first fiber reinforcing layer and the second fiber reinforcing layer contribute to the flexural rigidity and the torsional rigidity of the shaft 4.
  • the first fiber reinforcing layer and the second fiber reinforcing layer particularly contribute to the torsional rigidity of the shaft 4.
  • the third sheet S3 is unevenly present in the middle portion 14 of the shaft 4.
  • the shape of the third sheet S3 is approximately a parallelogram.
  • the third sheet S3 contains a plurality of carbon fibers arranged in parallel.
  • the extending direction of each carbon fiber is inclined with respect to the axial direction.
  • the angle of the extending direction of the carbon fibers with respect to the axial direction is 30 ° or more and 60 ° or less. In this embodiment, this angle is 45 °.
  • the third sheet S3 has a width of 25 mm and a length of 70 mm.
  • the fourth seat S4 is unevenly present in the middle portion 14 of the shaft 4.
  • the position of the fourth sheet S4 coincides with the position of the third sheet S3.
  • the shape of the fourth sheet S4 is approximately a parallelogram.
  • the fourth sheet S4 contains a plurality of carbon fibers arranged in parallel.
  • the extending direction of each carbon fiber is inclined with respect to the axial direction.
  • the angle of the extending direction of the carbon fibers with respect to the axial direction is ⁇ 60 ° or more and ⁇ 30 ° or less. In this embodiment, this angle is ⁇ 45 °.
  • the fourth sheet S4 has a width of 25 mm and a length of 70 mm.
  • the inclination direction of the carbon fibers in the fourth sheet S4 is opposite to the inclination direction of the carbon fibers in the third sheet S3. Therefore, the inclination direction of the carbon fibers in the fourth fiber reinforcing layer is opposite to the inclination direction of the carbon fibers in the third fiber reinforcing layer.
  • a bias structure is achieved by a third fiber reinforced layer and a fourth fiber reinforced layer.
  • the third fiber reinforcing layer and the fourth fiber reinforcing layer contribute to the flexural rigidity and the torsional rigidity of the middle portion 14.
  • the third fiber reinforcing layer and the fourth fiber reinforcing layer particularly contribute to the torsional rigidity of the middle portion 14.
  • the fifth sheet S5 is biased toward the tip end 20 side of the shaft 4.
  • the shape of the fifth sheet S5 is generally trapezoidal.
  • the fifth sheet S5 contains a plurality of carbon fibers arranged in parallel.
  • the extending direction of each carbon fiber coincides with the axial direction. In other words, the angle of the extending direction of the carbon fibers with respect to the axial direction is substantially 0 °.
  • the width is 50 mm
  • the length of the upper base is 105 mm
  • the length of the lower base is 115 mm.
  • the carbon fibers contained in the fifth sheet S5 are substantially oriented in the axial direction. Therefore, even in the fifth fiber reinforcing layer, the carbon fibers are substantially oriented in the axial direction.
  • a structure in which the carbon fibers are substantially axially oriented is referred to as a "straight structure".
  • the fifth fiber reinforced layer has a straight structure. When the shaft 4 bends, a large tension is applied to these carbon fibers. This tension suppresses further bending of the shaft 4. In other words, these carbon fibers contribute to the flexural rigidity of the shaft 4. As shown in FIG.
  • the fifth sheet S5 is arranged in a zone that does not include the first measurement point P1 and the second measurement point P2 and includes the third measurement point P3 and the fourth measurement point P4 in the axial direction. ing. Therefore, the fifth fiber reinforced layer is also located in the zone which does not include the first measurement point P1 and the second measurement point P2 and includes the third measurement point P3 and the fourth measurement point P4 in the axial direction.
  • the fifth fiber reinforced layer particularly contributes to the flexural rigidity of the tip portion 16.
  • the sixth sheet S6 is biased toward the bad end 18 side of the shaft 4.
  • the shape of the sixth sheet S6 is generally trapezoidal.
  • the sixth sheet S5 contains a plurality of carbon fibers arranged in parallel. The extending direction of each carbon fiber coincides with the axial direction. In other words, the angle of the extending direction of the carbon fibers with respect to the axial direction is substantially 0 °.
  • the width is 50 mm
  • the length of the upper base is 155 mm
  • the length of the lower base is 165 mm.
  • the carbon fibers contained in the sixth sheet S6 are substantially oriented in the axial direction. Therefore, even in the sixth fiber reinforcing layer, the carbon fibers are substantially oriented in the axial direction.
  • the sixth fiber reinforcing layer has a straight structure. When the shaft 4 bends, a large tension is applied to these carbon fibers. This tension suppresses further bending of the shaft 4. In other words, these carbon fibers contribute to the flexural rigidity of the shaft 4.
  • the sixth sheet S6 is arranged in a zone containing the first measurement point P1 and the second measurement point P2 and not including the third measurement point P3 and the fourth measurement point P4 in the axial direction. ing.
  • the sixth fiber reinforced layer is also located in the zone containing the first measurement point P1 and the second measurement point P2 and not including the third measurement point P3 and the fourth measurement point P4 in the axial direction.
  • the sixth fiber reinforcing layer particularly contributes to the flexural rigidity of the bad portion 12.
  • the seventh sheet S7 is unevenly present in the middle portion 14 of the shaft 4.
  • the shape of the seventh sheet S7 is approximately a parallelogram.
  • the seventh sheet S7 contains a plurality of carbon fibers arranged in parallel.
  • the extending direction of each carbon fiber is inclined with respect to the axial direction.
  • the angle of the extending direction of the carbon fibers with respect to the axial direction is 30 ° or more and 60 ° or less. In this embodiment, this angle is 45 °.
  • the seventh sheet S7 has a width of 25 mm and a length of 110 mm.
  • the eighth sheet S8 is unevenly present in the middle portion 14 of the shaft 4. In the axial direction, the position of the eighth sheet S8 coincides with the position of the seventh sheet S7.
  • the shape of the eighth sheet S8 is approximately a parallelogram.
  • the eighth sheet S8 contains a plurality of carbon fibers arranged in parallel. The extending direction of each carbon fiber is inclined with respect to the axial direction. The angle of the extending direction of the carbon fibers with respect to the axial direction is ⁇ 60 ° or more and ⁇ 30 ° or less. In this embodiment, this angle is ⁇ 45 °.
  • the eighth sheet S8 has a width of 25 mm and a length of 110 mm.
  • the inclination direction of the carbon fibers in the eighth sheet S8 is opposite to the inclination direction of the carbon fibers in the seventh sheet S7. Therefore, the inclination direction of the carbon fibers in the eighth fiber reinforcing layer is opposite to the inclination direction of the carbon fibers in the seventh fiber reinforcing layer.
  • a bias structure is achieved by the seventh fiber reinforcing layer and the eighth fiber reinforcing layer.
  • the seventh fiber reinforcing layer and the eighth fiber reinforcing layer contribute to the flexural rigidity and the torsional rigidity of the middle portion 14.
  • the seventh fiber reinforcing layer and the eighth fiber reinforcing layer particularly contribute to the torsional rigidity of the middle portion 14.
  • the ninth sheet S9 is biased toward the tip end 20 side of the shaft 4.
  • the shape of the ninth sheet S9 is generally trapezoidal.
  • the ninth sheet S9 contains a plurality of carbon fibers arranged in parallel.
  • the extending direction of each carbon fiber coincides with the axial direction. In other words, the angle of the extending direction of the carbon fibers with respect to the axial direction is substantially 0 °.
  • the width is 50 mm
  • the length of the upper base is 85 mm
  • the length of the lower base is 95 mm.
  • the carbon fibers contained in the ninth sheet S9 are substantially oriented in the axial direction. Therefore, even in the ninth fiber reinforcing layer, the carbon fibers are substantially oriented in the axial direction.
  • the ninth fiber reinforced layer has a straight structure. When the shaft 4 bends, a large tension is applied to these carbon fibers. This tension suppresses further bending of the shaft 4. In other words, these carbon fibers contribute to the flexural rigidity of the shaft 4.
  • the ninth sheet S9 is arranged in a zone that does not include the first measurement point P1, the second measurement point P2, and the third measurement point P3 and includes the fourth measurement point P4 in the axial direction. ing.
  • the ninth fiber reinforced layer is also located in the zone which does not include the first measurement point P1, the second measurement point P2, and the third measurement point P3 in the axial direction and also includes the fourth measurement point P4.
  • the ninth fiber reinforcing layer particularly contributes to the flexural rigidity of the tip portion 16.
  • the tenth sheet S10 is biased toward the bad end 18 side of the shaft 4.
  • the shape of the tenth sheet S10 is generally trapezoidal.
  • the tenth sheet S10 contains a plurality of carbon fibers arranged in parallel.
  • the extending direction of each carbon fiber coincides with the axial direction. In other words, the angle of the extending direction of the carbon fibers with respect to the axial direction is substantially 0 °.
  • the width is 50 mm
  • the length of the upper base is 135 mm
  • the length of the lower base is 145 mm.
  • the carbon fibers contained in the tenth sheet S10 are substantially oriented in the axial direction. Therefore, even in the tenth fiber reinforced layer, the carbon fibers are substantially oriented in the axial direction.
  • the tenth fiber reinforced layer has a straight structure. When the shaft 4 bends, a large tension is applied to these carbon fibers. This tension suppresses further bending of the shaft 4. In other words, these carbon fibers contribute to the flexural rigidity of the shaft 4.
  • the tenth sheet S10 is arranged in a zone containing the first measurement point P1 and not including the second measurement point P2, the third measurement point P3, and the fourth measurement point P4 in the axial direction. ing.
  • the tenth fiber reinforced layer is also located in a zone containing the first measurement point P1 and not including the second measurement point P2, the third measurement point P3, and the fourth measurement point P4 in the axial direction.
  • the tenth fiber reinforced layer particularly contributes to the flexural rigidity of the bad portion 12.
  • the eleventh sheet S11 exists over the entire shaft 4.
  • the shape of the eleventh sheet S11 is substantially rectangular.
  • the eleventh sheet S11 contains a plurality of carbon fibers arranged in parallel.
  • the extending direction of each carbon fiber coincides with the axial direction.
  • the angle of the extending direction of the carbon fibers with respect to the axial direction is substantially 0 °.
  • the eleventh sheet S11 has a width of 30 mm and a length of 340 mm.
  • the carbon fibers contained in the eleventh sheet S11 are substantially oriented in the axial direction. Therefore, even in the eleventh fiber reinforced layer, the carbon fibers are substantially oriented in the axial direction.
  • the eleventh fiber reinforced layer has a straight structure. When the shaft 4 bends, a large tension is applied to these carbon fibers. This tension suppresses further bending of the shaft 4. In other words, these carbon fibers contribute to the flexural rigidity of the shaft 4.
  • the first fiber reinforcing layer, the second fiber reinforcing layer and the eleventh fiber reinforcing layer exist from the bad end 18 to the chip end 20. These fiber reinforced layers can contribute to the durability of the shaft 4.
  • the sheets shown in FIG. 5 are sequentially wound around the mandrel.
  • the first sheet S1 and the second sheet S2 may be overlapped and wound around a mandrel.
  • the third sheet S3 and the fourth sheet S4 may be overlapped and wound around a mandrel.
  • the seventh sheet S7 and the eighth sheet S8 may be overlapped and wound around a mandrel.
  • other sheets may be wrapped around the mandrel. Examples of other sheets include those containing glass fiber.
  • Wrapping tape is further wrapped around these sheets.
  • These mandrels, prepregs (sheets S1-S11) and lapping tape are heated in an oven or the like. By heating, the resin of the matrix flows. Further heating causes the resin to undergo a curing reaction to obtain a molded product. The end face is processed, polished, painted, and the like to complete the shaft 4.
  • FIG. 6 is a schematic view showing a method of measuring the flexural rigidity value EI of the shaft 4 of the racket 2 of FIG.
  • FIG. 6 shows the measurement at the measurement point P where the distance from the grip 8 is L1.
  • the shaft 4 is supported from below by the first support point 28 and the second support point 30.
  • the distance from the measurement point P to the first support point 28 is 30 mm.
  • the distance from the measurement point P to the second support point 30 is 30 mm.
  • the measurement is performed by a universal material testing machine (trade name "2020" of Intesco Co., Ltd.).
  • This testing machine has an indenter 32.
  • the shape of the indenter 32 is a hemisphere.
  • the radius of curvature of this hemisphere is 20 mm.
  • the indenter 32 gradually descends at a speed of 2 mm / min.
  • the indenter 32 comes into contact with the measurement point P and further pushes the shaft 4. This push gradually bends the shaft 4.
  • the amount of deflection B (m) of the shaft 4 when the load on the shaft 4 by the indenter 32 reaches 100 N is measured.
  • This amount of deflection B is substituted into the following mathematical formula to calculate the flexural rigidity value EI (Nm 2 ).
  • EI F ⁇ L2 3 / (48 ⁇ B)
  • F is the load (N)
  • L2 is the distance (m) between the two support points
  • B is the amount of deflection (m).
  • the load F is 100N and the distance L2 is 0.06m.
  • the flexural rigidity value EI of the shaft 4 may be measured in a state where the grip 8 and the frame 6 are not attached.
  • the flexural rigidity value EI is measured at the first measurement point P1, the second measurement point P2, the third measurement point P3, and the fourth measurement point P4.
  • the distance L1 from the grip 8 to each measurement point is as follows. First measurement point P1: 35 mm Second measurement point P2: 75 mm Third measurement point P3: 115 mm Fourth measurement point P4: 155 mm
  • the flexural rigidity value EI (1) at the first measurement point P1 is 5.67 Nm 2
  • the flexural rigidity value EI (2) at the second measurement point P2 is 3. It is .16 Nm 2
  • the flexural rigidity value EI (3) at the third measurement point P3 is 3.50 Nm 2
  • the flexural rigidity value EI (4) at the fourth measurement point P4 is 5.05 Nm 2 .
  • the flexural rigidity distribution of the shaft 4 is shown in the graph of FIG.
  • the flexural rigidity value EI (2) at the second measurement point P2 is smaller than the flexural rigidity value EI (1) at the first measurement point P1, and the flexural rigidity value at the fourth measurement point P4. It is smaller than EI (4).
  • the flexural rigidity value EI (3) at the third measurement point P3 is smaller than the flexural rigidity value EI (1) at the first measurement point P1, and the flexural rigidity at the fourth measurement point P4. Less than the value EI (4).
  • the shaft 4 has a downwardly convex stiffness distribution.
  • the fifth fiber reinforced layer is located in a zone that does not include the first measurement point P1 and the second measurement point P2 and includes the third measurement point P3 and the fourth measurement point P4 in the axial direction.
  • the sixth fiber reinforced layer is located in a zone containing the first measurement point P1 and the second measurement point P2 and not including the third measurement point P3 and the fourth measurement point P4 in the axial direction.
  • the ninth fiber reinforced layer is located in a zone that does not include the first measurement point P1, the second measurement point P2, and the third measurement point P3 in the axial direction and includes the fourth measurement point P4.
  • the tenth fiber reinforced layer is located in a zone containing the first measurement point P1 and not including the second measurement point P2, the third measurement point P3, and the fourth measurement point P4 in the axial direction. There is no fiber reinforced layer that is located in the zone that does not include the first measurement point P1 and includes the second measurement point P2 and the third measurement point P3, and has a straight structure. There is no fiber reinforced layer located in the zone containing the second measurement point P2 and the third measurement point P3 and not including the fourth measurement point P4, and having a straight structure. With this layered structure, a downwardly convex flexural rigidity distribution can be achieved.
  • a downwardly convex flexural rigidity distribution can also be achieved by other layer structures. Since the fiber reinforcing layers having a straight structure are unevenly distributed in the bad portion 12 and the chip portion 16, a downwardly convex bending rigidity distribution can be achieved.
  • the shaft 4 having a downwardly convex flexural rigidity distribution is suitable for smashing.
  • a player who smashes using this racket 2 can fly the shuttle at high speed.
  • the reason why the racket 2 according to the present invention is suitable for smashing is that the bending rigidity distribution shown in FIG. 7 matches the deformation behavior of the shaft 4 in smashing. In the smash, the shaft 4 bends significantly in the in-plane direction (direction along the XY plane) and in the out-of-plane direction (Z direction).
  • the racket 2 according to the present invention is also suitable for shots other than smash, in which the shaft 4 bends significantly in both the in-plane direction and the out-of-plane direction.
  • the flexural rigidity distribution can be adjusted by changing the position of the prepreg, the number of prepregs, the width of the prepreg, the length of the prepreg, the angle of the fiber, the amount of the grain of the fiber, the elastic modulus of the fiber, and the like.
  • the ratio of the flexural rigidity value EI (2) to the flexural rigidity value EI (1) is preferably 0.95 or less, preferably 0.75 or less. More preferably, 0.65 or less is particularly preferable. From the viewpoint of ease of manufacturing the shaft 4, this ratio is preferably 0.30 or more.
  • the ratio of the flexural rigidity value EI (2) to the flexural rigidity value EI (4) is preferably 0.95 or less, preferably 0.84 or less. More preferably, 0.75 or less is particularly preferable. From the viewpoint of ease of manufacturing the shaft 4, this ratio is preferably 0.30 or more.
  • the ratio of the flexural rigidity value EI (3) to the flexural rigidity value EI (1) is preferably 0.95 or less, preferably 0.80 or less. More preferably, 0.70 or less is particularly preferable. From the viewpoint of ease of manufacturing the shaft 4, this ratio is preferably 0.30 or more.
  • the ratio of the flexural rigidity value EI (3) to the flexural rigidity value EI (4) is preferably 0.95 or less, preferably 0.89 or less. More preferably, 0.79 or less is particularly preferable. From the viewpoint of ease of manufacturing the shaft 4, this ratio is preferably 0.30 or more.
  • the ratio (EI (1) / EI (4)) is preferably 0.5 or more and 2.0 or less.
  • the ratio (EI (2) / EI (3)) is preferably 0.5 or more and 2.0 or less.
  • the difference (EI (2) -EI (1)) between the flexural rigidity value EI (2) and the flexural rigidity value EI (1) is preferably ⁇ 0.30 Nm 2 or less, and -1. 25 Nm 2 or less is more preferable, and -1.75 Nm 2 or less is particularly preferable. From the viewpoint of ease of manufacturing the shaft 4, this difference is preferably ⁇ 5.0 Nm 2 or more.
  • the difference (EI (2) -EI (4)) between the flexural rigidity value EI (2) and the flexural rigidity value EI (4) is preferably ⁇ 0.30 Nm 2 or less, and ⁇ 0. 73Nm more preferably 2 or less, -1.20Nm 2 or less is particularly preferred. From the viewpoint of ease of manufacturing the shaft 4, this difference is preferably ⁇ 5.0 Nm 2 or more.
  • the difference (EI (3) -EI (1)) between the flexural rigidity value EI (3) and the flexural rigidity value EI (1) is preferably ⁇ 0.30 Nm 2 or less, and -1. 03 Nm 2 or less is more preferable, and -1.50 Nm 2 or less is particularly preferable. From the viewpoint of ease of manufacturing the shaft 4, this difference is preferably ⁇ 5.0 Nm 2 or more.
  • the difference (EI (3) -EI (4)) between the flexural rigidity value EI (3) and the flexural rigidity value EI (4) is preferably ⁇ 0.30 Nm 2 or less, and ⁇ 0. 51 Nm 2 or less is more preferable, and ⁇ 1.00 Nm 2 or less is particularly preferable. From the viewpoint of ease of manufacturing the shaft 4, this difference is preferably ⁇ 5.0 Nm 2 or more.
  • the preferable range of the flexural rigidity value EI is as follows. EI (1): 3.5Nm 2 or 7.5 nm 2 or less EI (2): 1.0Nm 2 or 5.0 nm 2 or less EI (3): 1.0Nm 2 or 5.0 nm 2 or less EI (4): 3.5Nm 2 or more and 7.5Nm 2 or less
  • FIG. 3 shows the first measurement point P1, the second measurement point P2, the third measurement point P3, and the fourth measurement point P4.
  • the inner diameter Di of the shaft 4 is substantially uniform from the first measurement point P1 to the fourth measurement point P4.
  • the shaft 4 can be manufactured with a mandrel having a simple shape. In the manufacture of the shaft 4, the prepreg can be easily wound.
  • the shaft 4 may have some variation in the inner diameter Di due to a manufacturing error or the like.
  • the ratio (Di1 / Di2) of the maximum inner diameter Di1 to the minimum inner diameter Di2 from the first measurement point P1 to the fourth measurement point P4 is preferably 1.10 or less, more preferably 1.05 or less, and 1.03 or less. Is particularly preferable.
  • the ideal ratio (Di1 / Di2) is 1.00.
  • the outer diameter Do of the shaft 4 is substantially uniform from the first measurement point P1 to the fourth measurement point P4.
  • the shaft 4 can be manufactured with a mandrel having a simple shape. In the manufacture of the shaft 4, the prepreg can be easily wound.
  • the shaft 4 may have some variation in outer diameter Do due to manufacturing error or the like.
  • the ratio (Do1 / Do2) of the maximum outer diameter Do1 to the minimum outer diameter Do2 from the first measurement point P1 to the fourth measurement point P4 is preferably 1.10 or less, more preferably 1.05 or less. 03 or less is particularly preferable.
  • the ideal ratio (Do1 / Do2) is 1.00.
  • the ratio (W2 / W1) of the mass W2 of the shaft 4 from the second measurement point P2 to the third measurement point P3 and the mass W1 of the shaft 4 from the first measurement point P1 to the second measurement point P2 is 0. It is preferably 95 or more and 1.05 or less. Further, the ratio (W2 / W3) of this mass W2 to the mass W3 of the shaft 4 from the third measurement point P3 to the fourth measurement point P4 is preferably 0.95 or more and 1.05 or less. In this shaft 4, there is no bias in mass. The player can swing the racket 2 having the shaft 4 without discomfort. From this viewpoint, the ratio (W2 / W1) and the ratio (W2 / W3) are more preferably 0.97 or more and 1.03 or less, and particularly preferably 0.98 or more and 1.02 or less.
  • the flexural rigidity distribution is not adjusted by adjusting the wall thickness.
  • the flexural rigidity distribution is not adjusted by forming the opening.
  • the shaft 4 has excellent durability.
  • Example 1 The badminton racket shown in Fig. 1-6 was manufactured.
  • the flexural rigidity value EI of this racket is shown in Table 1 and FIG. 7 below.
  • Example 2 and 3 and comparative examples The badminton rackets of Examples 2 and 3 and Comparative Example were obtained in the same manner as in Example 1 except that the prepreg configuration was changed.
  • the flexural rigidity EI of these rackets is shown in Table 1 and FIG. 8-10 below.
  • the badminton racket according to the present invention is suitable for a smash-heavy style player. This racket is also suitable for other styles of players.

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PCT/JP2021/001553 2020-02-18 2021-01-19 バドミントンラケット WO2021166519A1 (ja)

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JPH0568561U (ja) * 1992-02-26 1993-09-17 富傑體育用品股▲ふん▼有限公司 ラケット
JPH0671001A (ja) * 1991-11-27 1994-03-15 Wilson Sporting Goods Co バドミントン用ラケット
JP2001070481A (ja) 1999-08-27 2001-03-21 Kanko Fukugo Zairyo Kofun Yugenkoshi バドミントンラケット
JP2014045947A (ja) * 2012-08-31 2014-03-17 Globeride Inc バドミントンラケットに用いられるシャフトを製造する方法
CN203763800U (zh) * 2014-01-16 2014-08-13 石狮市冠豪体育用品有限公司 一种改良型羽球拍
CN205252447U (zh) * 2015-10-20 2016-05-25 徐建昇 一种羽毛球拍中管补强结构
JP2021023724A (ja) * 2019-08-08 2021-02-22 住友ゴム工業株式会社 バドミントンラケットの仕様決定方法及びシャフト挙動の解析方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012147846A (ja) * 2011-01-17 2012-08-09 Yonex Co Ltd バドミントンラケット
CN205340022U (zh) * 2015-11-26 2016-06-29 徐建昇 羽毛球拍中管增强结构

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0671001A (ja) * 1991-11-27 1994-03-15 Wilson Sporting Goods Co バドミントン用ラケット
JPH0568561U (ja) * 1992-02-26 1993-09-17 富傑體育用品股▲ふん▼有限公司 ラケット
JP2001070481A (ja) 1999-08-27 2001-03-21 Kanko Fukugo Zairyo Kofun Yugenkoshi バドミントンラケット
JP2014045947A (ja) * 2012-08-31 2014-03-17 Globeride Inc バドミントンラケットに用いられるシャフトを製造する方法
CN203763800U (zh) * 2014-01-16 2014-08-13 石狮市冠豪体育用品有限公司 一种改良型羽球拍
CN205252447U (zh) * 2015-10-20 2016-05-25 徐建昇 一种羽毛球拍中管补强结构
JP2021023724A (ja) * 2019-08-08 2021-02-22 住友ゴム工業株式会社 バドミントンラケットの仕様決定方法及びシャフト挙動の解析方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4098332A4

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JP7424096B2 (ja) 2024-01-30
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EP4098332A1 (de) 2022-12-07

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