EP0212014A1 - Raquette - Google Patents

Raquette Download PDF

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Publication number
EP0212014A1
EP0212014A1 EP85305562A EP85305562A EP0212014A1 EP 0212014 A1 EP0212014 A1 EP 0212014A1 EP 85305562 A EP85305562 A EP 85305562A EP 85305562 A EP85305562 A EP 85305562A EP 0212014 A1 EP0212014 A1 EP 0212014A1
Authority
EP
European Patent Office
Prior art keywords
frame
racket
strings
structural member
holes
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Withdrawn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
EP85305562A
Other languages
German (de)
English (en)
Inventor
Yutaka Takashima
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.)
Gosen Co Ltd
Original Assignee
Gosen 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
Priority to AU45576/85A priority Critical patent/AU575417B2/en
Application filed by Gosen Co Ltd filed Critical Gosen Co Ltd
Priority to EP85305562A priority patent/EP0212014A1/fr
Publication of EP0212014A1 publication Critical patent/EP0212014A1/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Withdrawn legal-status Critical Current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
    • 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
    • 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

  • This invention relates to rackets used for outdoor and indoor sports such as tennis and badminton.
  • Rackets with a larger hitting face have become popular recently and the strings for these larger face rackets are smaller in diameter and are stretched more tightly to make the whole racket less heavy and to improve the feeling when hitting the ball.
  • the cause for lowered durability is regarded as wear of the strings due to friction between the strings at the crossing points.
  • Smaller meshes at the sweet spot can be realized by making the spacing of the through holes for the strings on the frame smaller. This arrangement, however, causes other problems such as deformation of the frame by tension of the strings or cracking of the frame between the through holes for the strings. Cutting of the frame could be avoided by increasing the strength of the frame, but the weight of the frame would be increased by such an arrangement.
  • a racket having a frame comprising a core member and a structural member covering said core member, said structural member being strengthened, at least in regions where the holes for the racket strings are close together, by being made thicker on the outside and thinner on the inside of the frame.
  • the racket of the present invention comprises a core member 2 made of light weight foamed plastic material and a structural member 3 which covers the core member 2.
  • the structural member 3 is made of several layers of resin-impregnated fibre sheet 4 superimposed and the surface is covered with an exterior member 12, which is made by spraying or coating a one-component or two-component system resin material of amino-resin such as melamine resin or of urethane resin or enamel.
  • the frame 1 has a gut groove 9 formed on the outside of almost the entire circumference and a number of through holes 6 for guts are drilled through the frame in the gut groove 9. Guts 7 are passed through the holes 6 and are crossed inside the frame 1 to form the meshes 8a...., 8b....
  • adjacent through holes 6 are spaced smaller than the adjacent stringing holes at other parts.
  • This arrangement makes the meshes 8a of the guts 7 at the sweet spot (centre of the frame 1) smaller than the meshes 8b at other parts and the flexure of the strings in both directions larger.
  • the structural member 3 of the frame 1 is made thicker at the outer side 10 by increasing the number of layers of the resin-­impregnated fibre sheets 7 to seven layers and is made thinner at the inside 11 to the equal degree by reducing the resin-impregnated fibre sheets 4 to five layers, although conventional frames are made of the same number of layers at both outer side 10 and inner side 11. By this arrangement, the strength of the outer side 10 can be increased without increasing the weight of the frame.
  • the resin-impregnated fibre sheets are made of high-­strength fibres such as glass or carbon fibre bound together and fixed into sheet form with an adequate resin.
  • the sheets are attached with the fibre direction perpendicular or inclined to the peripheral direction of the frame since the reinforcement effect is lower if the fibres extend along the peripheral direction of the frame. It is still better for reinforcement to overlap successive sheets 4 with the fibre directions crossing each other diagonally or at right angles.
  • Fig. 5 shows an embodiment of a racket for badminton in accordance with the present invention.
  • the frame 13 is made in the same way as the above described embodiment.
  • the spacing between the through stringing holes (not illustrated) on the frame 13 is so arranged that the meshes 15a of the strings 14 at the sweet spot are smaller than the meshes 15b in other parts of the racket face.
  • the structural member of the frame 13 is so adjusted, although not illustrated, that the outside of the frame is thicker and the inside is thinner at the middle of the upper, lower, right and left parts 13a, 13b, 13c, 13d.
  • the structural member of the frame is made of laminated resin-impregnated fibre sheets.
  • the material is not limited to this and can be layers of aramid fibre such as Kevlar (by Du Pont) and of resin-impregnated fabric, or boron, aluminium and other metals, or may be wood.
  • the number of layers of the frame structural member is so adjusted that the outer side is thicker and the inner side is thinner by the equal degree.
  • Thickness adjustment of the structural member is not limited to the method of exact adjustment of the number of sheets as described above. Any other adjustment is acceptable if the outer side strength is increased and inner side strength is maintained at the required level.
  • Adjustment of thickness need not necessarily be made around the whole periphery of the frame but may be only at the parts where the spacing of the stringing holes is smaller than the spacing at other parts, which means at least two parts, either the upper and lower parts or the right and left parts.
  • the racket of the present invention is effective to prevent mesh deflection of the strings and thus reduce wear of the strings and increase the durability of the strings since the spacing between stringing holes on the frame is so adjusted that the meshes of the strings at the sweet spot are smaller than the meshes at any other part allowing larger flexure of the guts.
  • the effect can be more significant when the invention is applied to rackets of large size.
  • the invention is also effective to prevent cutting of the frame between stringing holes on the frame and deformation of the frame because the structural member of the frame is made thicker at the outside and thinner at the inside at least where the spacing of the stringing holes is smaller than the spacing at other parts and thus the strength of the frame at the outer side is increased without increasing the weight of the frame.
EP85305562A 1985-08-05 1985-08-05 Raquette Withdrawn EP0212014A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU45576/85A AU575417B2 (en) 1985-08-05 1985-07-30 Sports racket
EP85305562A EP0212014A1 (fr) 1985-08-05 1985-08-05 Raquette

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85305562A EP0212014A1 (fr) 1985-08-05 1985-08-05 Raquette

Publications (1)

Publication Number Publication Date
EP0212014A1 true EP0212014A1 (fr) 1987-03-04

Family

ID=8194312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85305562A Withdrawn EP0212014A1 (fr) 1985-08-05 1985-08-05 Raquette

Country Status (2)

Country Link
EP (1) EP0212014A1 (fr)
AU (1) AU575417B2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5242162A (en) * 1991-08-02 1993-09-07 Arthur Hong String holes of a sports racket frame
US5507486A (en) * 1991-10-07 1996-04-16 Sumitomo Rubber Industries, Ltd. Tennis racket frame
US5700210A (en) * 1995-04-20 1997-12-23 Yamaha Corporation Racket frame and process for producing the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB603917A (en) * 1945-11-05 1948-06-25 Spalding & Bros Ltd Ag Improvements in or relating to tennis and like racquets
US4070021A (en) * 1976-07-07 1978-01-24 Fansteel Inc. Composite high strength to weight structure having shell and sleeved core
DE2910424A1 (de) * 1979-03-16 1980-09-25 Voelkl Ohg Franz Tennisschlaeger
EP0046204A2 (fr) * 1980-08-14 1982-02-24 Friedrich Dr. Esper Profilé en matière stratifiée
US4399992A (en) * 1980-03-10 1983-08-23 Questor Corporation Structural member having a high strength to weight ratio and method of making same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB603917A (en) * 1945-11-05 1948-06-25 Spalding & Bros Ltd Ag Improvements in or relating to tennis and like racquets
US4070021A (en) * 1976-07-07 1978-01-24 Fansteel Inc. Composite high strength to weight structure having shell and sleeved core
DE2910424A1 (de) * 1979-03-16 1980-09-25 Voelkl Ohg Franz Tennisschlaeger
US4399992A (en) * 1980-03-10 1983-08-23 Questor Corporation Structural member having a high strength to weight ratio and method of making same
EP0046204A2 (fr) * 1980-08-14 1982-02-24 Friedrich Dr. Esper Profilé en matière stratifiée

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5242162A (en) * 1991-08-02 1993-09-07 Arthur Hong String holes of a sports racket frame
US5507486A (en) * 1991-10-07 1996-04-16 Sumitomo Rubber Industries, Ltd. Tennis racket frame
US5700210A (en) * 1995-04-20 1997-12-23 Yamaha Corporation Racket frame and process for producing the same

Also Published As

Publication number Publication date
AU4557685A (en) 1987-02-05
AU575417B2 (en) 1988-07-28

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Legal Events

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

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AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE FR GB IT NL

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19870907

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TAKASHIMA, YUTAKA