EP0544248A1 - Badmintonschläger - Google Patents

Badmintonschläger Download PDF

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Publication number
EP0544248A1
EP0544248A1 EP92120069A EP92120069A EP0544248A1 EP 0544248 A1 EP0544248 A1 EP 0544248A1 EP 92120069 A EP92120069 A EP 92120069A EP 92120069 A EP92120069 A EP 92120069A EP 0544248 A1 EP0544248 A1 EP 0544248A1
Authority
EP
European Patent Office
Prior art keywords
racket
handle
inches
center
head
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
EP92120069A
Other languages
English (en)
French (fr)
Other versions
EP0544248B1 (de
Inventor
Po-Jen Cheng
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.)
Wilson Sporting Goods Co
Original Assignee
Wilson Sporting Goods Co
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 Wilson Sporting Goods Co filed Critical Wilson Sporting Goods Co
Publication of EP0544248A1 publication Critical patent/EP0544248A1/de
Application granted granted Critical
Publication of EP0544248B1 publication Critical patent/EP0544248B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • 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
    • A63B49/03—Frames characterised by throat sections, i.e. sections or elements between the head and the shaft
    • A63B49/032—T-shaped connection elements
    • 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
    • A63B2049/0201—Frames with defined head dimensions
    • A63B2049/0203—Frames with defined head dimensions height
    • 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
    • A63B2049/0201—Frames with defined head dimensions
    • A63B2049/0204—Frames with defined head dimensions width
    • 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
    • A63B2049/0207—Frames with defined overall length
    • 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
    • A63B2049/0212—Frames with defined weight
    • 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
    • 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
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/06—Handles
    • 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
    • A63B60/08—Handles characterised by the material
    • 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

Definitions

  • This invention relates to badminton rackets, and, more particularly, to a badminton racket which is lighter than prior badminton rackets and which has a balance point or center of gravity closer to the head end of the racket than to the handle end.
  • Badminton rackets conventionally have a length of about 26 inches and a weight of about 100 grams. The balance point or center of gravity of those rackets lies closer to the handle end of the racket than the head end. Accordingly, the prior badminton rackets are "head light.” They typically include lead or other weight in the handle to increase the weight of the racket and to produce the "head light" characteristic.
  • Weight (Grams) Length (Inches) Balance (Inches) Iend (oz. in.2) 95 to 115 25.98 to 26.23 11.34 to 12.60 707 to 826
  • Weight is the distance of the balance point or center of gravity from the handle end of the racket.
  • Iend is the moment of inertia about an axis at the end of the handle which extends perpendicularly to the handle and is a measure of the ability of the racket to resist rotation about the axis.
  • Frolow Reissue U.S. Patent No. 31,419 describes a tennis racket which weighs less than conventional tennis rackets. Weight, removed from the handle end and added to the head end, makes the racket "head heavy," i.e. , the balance point or center of gravity lies closer to the head end of the racket than the handle end. Frolow does not describe a badminton racket, which is distinctly different than a tennis racket in shape, weight, and other physical characteristics.
  • Strauch et al. U.S. Patent No. 5,062,634 describes a "head heavy" squash racket.
  • the racket is light and has a balance point or center of gravity closer to the head than the handle.
  • Strauch et al. do not describe a badminton racket which has distinctly different physical characteristics than a squash racket.
  • the invention provides a badminton racket which is significantly lighter than prior badminton rackets and which is "head heavy.”
  • the weight of the racket is within the range of about 75 to 85 grams, and preferably within the range of about 80 to 85 grams.
  • the length of the racket is about 26 inches, and the balance point or center of gravity is about 13.4 to 15.2 inches from the handle end.
  • the moment of inertia about an axis at the end of the handle is within the range of about 700 to 780 oz. in.2, and preferably within the range of about 730 to 765 oz. in.2, and the center of percussion is about 18.7 to 20.5 inches from the handle end of the racket.
  • the numeral 20 designates a badminton racket of the present invention.
  • This racket has a frame 21 which includes a hoop-shaped head portion 22 at one end, a generally T-shaped throat portion 23, and an elongated shaft portion 24 at the other, opposite end.
  • the shaft portion terminates in a handle portion 25.
  • the head portion supports conventional string 26 with longitudinal and transverse portions which provide a conventional strung surface.
  • the outer surface of the head portion 22 has a groove 27 (See FIGS. 3 and 4) to accommodate the cross-over portions of the strings; and drilled openings 28 in the head portion 22, through which the string extends, help define a pattern for the string.
  • the racket has a conventional butt cap 29 mounted on the butt end 30 of the handle portion 25. It also includes a flexible strip of leather or synthetic material 31 (See FIG. 14) spirally wound around the handle portion to provide a hand grip. Finally, it includes a bumper guard 32 which lies in the groove 27 and includes eyelets sized to fit into the openings 28.
  • the guard 32 is a nylon member, or a member made out of any other suitable material.
  • the racket string 26 extends through its eyelets and secures it in place (See FIGS. 1-3).
  • the frame comprises molded graphite fibers and resin, although other materials may also form the frame, e.g. , aluminum, graphite reinforced aluminum, polymers, fiber reinforced metals, etc.
  • the frame's shape and cross section make it lighter than conventional badminton racket frames and head heavy.
  • the particular racket illustrated in FIGS. 1 and 2 has a weight within the range of about 75 to 85 grams, and preferably within the range of about 80 to 85 grams.
  • the overall length L of the racket is 26 inches, and the balance point or center of gravity is 13.4 to 15.2 inches from the butt end 30 of the racket.
  • the end moment of inertia of the racket about an axis G-G is from 700 to 780 oz. in.2, and preferably from 730 to 765 oz. in.2.
  • the axis G-G extends perpendicularly to the handle portion 25 at the butt end 30.
  • the moment of inertia about an axis Y-Y, lying perpendicularly of the axis G-G along the center of the racket and extending through the center of gravity, is from 9 to 12 oz. in.2.
  • the moment of inertia about an axis X-X, extending through the balance point or center of gravity and lying parallel to the axis G-G is from 160 to 220 oz. in.2.
  • the center of percussion of a racket is the point at which a ball striking a freely suspended racket will cause the racket to rotate about the axis G-G without moving the axis G-G.
  • Prior badminton rackets generally have a center of percussion less than 18.54 inches from an axis at the butt end 30.
  • the racket illustrated in FIGS. 1 and 2 has its center of percussion at 18.90 inches from the butt end 30 when measuring the center of percussion with respect to the axis G-G at the butt end.
  • the center of percussion is 17.4 inches from that axis toward the head end 33.
  • the following parameters further define the configuration of the racket of the present invention which includes a generally oval head.
  • the longitudinal dimension A of the strung surface which is the inside dimension of the head portion, is 9.32 inches. This dimension may be within the range of 9.3 to 11.0 inches.
  • the transverse dimension B of the strung surface is 7.24 inches. This dimension may be within the range of 7.0 to 8.6 inches.
  • the length D of the handle portion 25 is 5.16 inches.
  • FIGS. 3-14 illustrate the height H and width W of the cross section of the frame at Sections 3-3 through 12-12, respectively.
  • the height and width of the cross sections vary along the length of the frame as shown in FIG. 2.
  • the height H and width W of the cross sections of one example of the racket appear below in Table I.
  • One forms the racket of the present invention using conventional fabrication methods. They include forming the frame by laying graphite fibers and resin around an elongated inflatable bladder, arranging the bladder in the shape of the frame, curing the resin under heat and pressure, and deflating the bladder and removing it to provide a hollow frame. Subsequent steps include the assembly of the frame and the guard and handle components and the stringing of the racket.
  • the badminton racket of the present invention may include a frame with a thicker portion at the head end 33 to increase the weight on the head side of the racket and help provide the "head heavy" feature.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Pulmonology (AREA)
  • Golf Clubs (AREA)
  • Steroid Compounds (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Saccharide Compounds (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP92120069A 1991-11-27 1992-11-25 Badmintonschläger Expired - Lifetime EP0544248B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80059391A 1991-11-27 1991-11-27
US800593 1991-11-27

Publications (2)

Publication Number Publication Date
EP0544248A1 true EP0544248A1 (de) 1993-06-02
EP0544248B1 EP0544248B1 (de) 1995-11-08

Family

ID=25178812

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92120069A Expired - Lifetime EP0544248B1 (de) 1991-11-27 1992-11-25 Badmintonschläger

Country Status (10)

Country Link
EP (1) EP0544248B1 (de)
JP (1) JP2501277B2 (de)
KR (1) KR970006234B1 (de)
AT (1) ATE129913T1 (de)
AU (1) AU654413B2 (de)
CA (1) CA2083738A1 (de)
DE (1) DE69205948T2 (de)
DK (1) DK0544248T3 (de)
HK (1) HK122596A (de)
NZ (1) NZ245261A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015008890A (ja) * 2013-06-28 2015-01-19 美津濃株式会社 バドミントンラケットフレーム
KR101910343B1 (ko) * 2017-06-27 2018-10-22 박정숙 배드민턴 라켓
JP7085399B2 (ja) 2018-04-27 2022-06-16 ヨネックス株式会社 バドミントンラケット
JP7424096B2 (ja) * 2020-02-18 2024-01-30 住友ゴム工業株式会社 バドミントンラケット

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31419E (en) * 1976-01-05 1983-10-18 Tennis racket
GB2188848A (en) * 1986-04-12 1987-10-14 Lo Kun Nan Badminton racket
US5062634A (en) * 1990-08-31 1991-11-05 Wilson Sporting Goods Co. Squash racket
EP0456407A1 (de) * 1990-05-03 1991-11-13 Prince Sports Group, Inc. Badmintonschläger

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4291574A (en) * 1976-01-05 1981-09-29 Frolow Jack L Tennis racket

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31419E (en) * 1976-01-05 1983-10-18 Tennis racket
GB2188848A (en) * 1986-04-12 1987-10-14 Lo Kun Nan Badminton racket
EP0456407A1 (de) * 1990-05-03 1991-11-13 Prince Sports Group, Inc. Badmintonschläger
US5062634A (en) * 1990-08-31 1991-11-05 Wilson Sporting Goods Co. Squash racket

Also Published As

Publication number Publication date
NZ245261A (en) 1994-12-22
ATE129913T1 (de) 1995-11-15
DE69205948T2 (de) 1996-06-27
EP0544248B1 (de) 1995-11-08
DE69205948D1 (de) 1995-12-14
AU654413B2 (en) 1994-11-03
JPH0671001A (ja) 1994-03-15
CA2083738A1 (en) 1993-05-28
DK0544248T3 (da) 1995-12-11
JP2501277B2 (ja) 1996-05-29
AU2969392A (en) 1993-06-03
HK122596A (en) 1996-07-19
KR970006234B1 (ko) 1997-04-25
KR930009620A (ko) 1993-06-21

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