EP0538523A1 - Sportschläger - Google Patents

Sportschläger Download PDF

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Publication number
EP0538523A1
EP0538523A1 EP91309820A EP91309820A EP0538523A1 EP 0538523 A1 EP0538523 A1 EP 0538523A1 EP 91309820 A EP91309820 A EP 91309820A EP 91309820 A EP91309820 A EP 91309820A EP 0538523 A1 EP0538523 A1 EP 0538523A1
Authority
EP
European Patent Office
Prior art keywords
ball
frame
striking
mesh
shaft
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Withdrawn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
EP91309820A
Other languages
English (en)
French (fr)
Inventor
Chin-San You
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP91309820A priority Critical patent/EP0538523A1/de
Publication of EP0538523A1 publication Critical patent/EP0538523A1/de
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • A63B60/54—Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations

Definitions

  • the present invention relates to a ball racket, and more particularly to a ball racket frame having netted strings with a great ball-striking force.
  • the conventional sports racket of the prior art comprises a circular frame with netted surface for hitting a ball.
  • the structure of such circular frame extends in a uniform manner along the circular path.
  • all segments of such circular frame are similar to one another in their cross sections.
  • such circular frame is structurally defective in that it is not provided with a sound elasticity and that its ball-hitting force can not be effectively enhanced.
  • such racket frame with a structural uniformity permits the shock wave to be transmitted without difficulty. That is to say that a ball player using such racket is vulnerable to an arm injury caused by the impact transmitted to the handle from the frame which has hit a ball.
  • a sports racket which is made from fiber reinforced plastic material and is composed of a circular frame, a shaft, and a handle.
  • the circular frame is provided with a long axis and a short axis, which cross each other perpendicularly for netting the frame with strings to form a ball-striking netted surface.
  • the shaft is coupled at one end thereof with one end of the long axis of the circular frame and is fastened at other end thereof with the handle.
  • the circular frame is characterized in that it is provided with elastic segments located at both ends of the axis and symmetrical to each other.
  • FIG. 1 shows a plan view of the preferred embodiment of the present invention.
  • FIG. 2 shows a sectional view of the portion taken along the line 2-2 as shown in FIG. 1.
  • FIG. 3 shows a schematic view of expansion of the strings upon hitting a ball.
  • FIG. 4 shows a plan view of another preferred embodiment of the present invention.
  • the tennis racket 10 embodied in the present invention is shown comprising ci circular frame 14, a shaft 16, and a handle 18.
  • the circular frame 14 is composed of strings 20 making up the ball-striking netted surface 22 and is made from several intertwined sheets of carbonaceous fiber fabric pre-impregnated in epoxy resin.
  • the circular frame 14 comprises a plastic foamed material 12 embedded therein.
  • the circular frame 14 is, in fact, elliptical in shape and is provided with a short axis XX' and a long axis YY'.
  • the present invention is characterized in that the frame 14 comprises the first corrugated elastic segments 30 located symmetrically at both ends of the short axis XX' and disposed along the frame surface 24 perpendicular to the ball-striking netted surface 22.
  • the grooves and the ridges of the first corrugated elastic segments 30 located at both ends of the short axis XX' should be arranged in a corresponding manner so that they are subjected to pressure uniformly.
  • the circular frame 14 comprises two sets of string holes parallel to the frame surface 24 for receiving therein the strings 20 to form the ball-striking netted surface 22. The portion of the string 20 passing through the string hole is protected by the string protective jacket 26.
  • the circular frame 14 is provided with a better and uniform elasticity by virtue of the fact that it comprises the first elastic segments 30 located at both ends of the short axis XX' thereof. In other words, the rebounding capability of the strings located at the first elastic segments 30 and the adjacent areas is greatly enhanced. As a result, the ball-striking netted surface 22 is provided with a greater striking force against the ball.
  • the striking force of the netted surface of a racket is derived mainly from the expansive strength of each of the netted strings making contact with the ball.
  • the equation is expressed in a negative value to indicate that the force of the string is exerting on the ball in a direction opposite to the traveling direction of the ball. If the initial string tension (T) and the length of string (L) remain constant, the force of the string exerting on the ball (F) is directly proportional to the ball penetration distance (X).
  • the string 40 arranged longitudinally is shown making contact with the ball 1.
  • the ball penetration distance X1 of the string 40 of the present invention is greater than the ball penetration distance X0 of the string (indicated by dotted line ) of the prior art racket.
  • the striking force exerting on the ball by the netted surface of the present invention will increase in a direct proportion to an increase in the ball penetration distance.
  • the circular frame 14 of the present invention is provided with the first elastic segments 30, as described previously.
  • the sports racket frame of the present invention affords a better control of the ball.
  • the tennis racket 50 made from the fiber reinforced plastic material is shown comprising a circular frame 52, a shaft 54, and a handle 56.
  • the circular frame 52 is composed of first elastic segments 60 located at both ends of the short axis XX' thereof and of second elastic segments 70 located at both ends of the long axis YY' thereof. Both first and second elastic segments 60 and 70 are corrugated along the frame surface 59 perpendicular to the sweet spot 58. Accordingly, such tennis racket frame 50 is provided with means to achieve the intended objectives described above.
  • Both preferred embodiments described above are capable of mitigating effectively the transmission of shock wave to the handle from the head frame so as to minimize the risk of an arm injury to the player using such rackets.
EP91309820A 1991-10-23 1991-10-23 Sportschläger Withdrawn EP0538523A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP91309820A EP0538523A1 (de) 1991-10-23 1991-10-23 Sportschläger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91309820A EP0538523A1 (de) 1991-10-23 1991-10-23 Sportschläger

Publications (1)

Publication Number Publication Date
EP0538523A1 true EP0538523A1 (de) 1993-04-28

Family

ID=8208433

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91309820A Withdrawn EP0538523A1 (de) 1991-10-23 1991-10-23 Sportschläger

Country Status (1)

Country Link
EP (1) EP0538523A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0676222A1 (de) * 1994-04-11 1995-10-11 Yoo Suk-Ho Schläger mit unebenem Rahmen
US6447412B1 (en) * 2000-04-18 2002-09-10 Ef Composite Technologies, L.P. Sports racket with undulations in frame interior surface
GB2445351A (en) * 2007-01-05 2008-07-09 Dunlop Slazenger Group Ltd Paddle racket having reduced air resistance
US20190126106A1 (en) * 2016-06-03 2019-05-02 Yonex Kabushiki Kaisha Racket and grommet

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3700072C1 (de) * 1986-12-20 1988-04-28 Jin-San Hong Ballspielschlaeger,insbesondere Badmintonschlaeger
GB2203653A (en) * 1987-04-16 1988-10-26 Lo Kun Nan A racket with improved throat portion

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3700072C1 (de) * 1986-12-20 1988-04-28 Jin-San Hong Ballspielschlaeger,insbesondere Badmintonschlaeger
GB2203653A (en) * 1987-04-16 1988-10-26 Lo Kun Nan A racket with improved throat portion

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0676222A1 (de) * 1994-04-11 1995-10-11 Yoo Suk-Ho Schläger mit unebenem Rahmen
US6447412B1 (en) * 2000-04-18 2002-09-10 Ef Composite Technologies, L.P. Sports racket with undulations in frame interior surface
US6958104B1 (en) 2000-04-18 2005-10-25 Ef Composite Technologies, L.P. Sports racket with undulations in frame interior surface
GB2445351A (en) * 2007-01-05 2008-07-09 Dunlop Slazenger Group Ltd Paddle racket having reduced air resistance
US20190126106A1 (en) * 2016-06-03 2019-05-02 Yonex Kabushiki Kaisha Racket and grommet
US10974100B2 (en) * 2016-06-03 2021-04-13 Yonex Kabushiki Kaisha Racket and grommet

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19931029