EP0080797A2 - Cadre de raquette métallique - Google Patents

Cadre de raquette métallique Download PDF

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Publication number
EP0080797A2
EP0080797A2 EP82305062A EP82305062A EP0080797A2 EP 0080797 A2 EP0080797 A2 EP 0080797A2 EP 82305062 A EP82305062 A EP 82305062A EP 82305062 A EP82305062 A EP 82305062A EP 0080797 A2 EP0080797 A2 EP 0080797A2
Authority
EP
European Patent Office
Prior art keywords
frame
racket frame
tubular member
foamed core
metal
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Withdrawn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
EP82305062A
Other languages
German (de)
English (en)
Other versions
EP0080797A3 (en
Inventor
Kun Nan Lo
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.)
LO, KUN NAN
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
Publication of EP0080797A2 publication Critical patent/EP0080797A2/fr
Publication of EP0080797A3 publication Critical patent/EP0080797A3/en
Withdrawn legal-status Critical Current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
    • A63B49/12—Frames made of metal
    • 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

  • This invention relates to a frame of a racket for tennis, badminton etc., and particularly to those made of metals.
  • rackets with metal tubular frames are constructed in two forms, oval-shaped tubular structure and I-beam with two tubular ends.
  • racket frames are principally designed for strength and stiffness, such metal frames usually cannot possess a minimum desired weight due to the characteristic of the materials. Additionally, when striking the ball, shock and vibration will be transmitted to the hand of the player, especially when the stroke point is not at the centre of the racket. Therefore the player will easily feel fatigued and sometimes even get hurt.
  • the preferred form of metal racket frame to be employed in this invention is oval-shaped tubular structure. It is proposed by the inventor after he made a test for rigidity of the above two structures.
  • Figure 1 is a diagrammatic illustration with data of tests for rigidity in respect of the above two forms of frame, both of which have similar dimensions A, B, C and D as shown.
  • the handle portions thereof are supported fixedly and a load of 15 pounds is hung at the other free end of the frame. It is seen that the oval shaped tubular structure is bent such that the free end thereof deflects to a position having a distance of 20.2 mm from the original position, the cross-sections being 152.4 mm and 304.8 mm distant from the free end deflect to a position 9.9 mm and 5.6 mm distant from the original position respectively.
  • the I-beam frame makes a deflection that the free end, the cross-sections being at 152.4 mm and 304.8 mm distant from the free end move to the positions 23.92 mm, 11.2 mm and 6.11 mm distant from the original positions.
  • the oval-shaped tubular frame has higher strength and rigidity than the other one.
  • the object of the invention is further to improve the characteristics of the frame.
  • a racket frame comprises an elongated metal tubular member of hollow oval cross-section bent to form a head portion and a handle portion, characterised in that the oval section metal tubular member includes an elongated rigid foamed core filled therein.
  • the wall thickness of the metal may be reduced, thereby reducing the weight of the frame.
  • the foamed core reduces the vibration induced upon stroke.
  • the oval section tubular member is made of aluminium alloy and the foamed core is formed of a foamable polyurethane based composition.
  • a racket frame 10 of the present invention comprises a thin, elongated metal tube of oval cross-section bent to form a head portion 11 and a handle portion 12 of the frame.
  • This metal tube is made of aluminium alloy and the inside thereof is provided with a rigid foamed core 15 as shown in Figure 3.
  • This rigid foamed core is formed by inserting a foamable polyurethane based composition into the tube, heating to a certain temperature, and allowing it to expand and cure.
  • the formed frame 10 has an elongated metal shell 13 and a rigid foamed core 15 to reduce the weight of the frame.
  • the wall thickness of an aluminium alloy frame may be reduced to from 0.70 to 1.05 mm, compared to the 1.1 mm wall thickness shown in Figure 1 as being commonly used in prior art frames. Due to the presence of the foamed core 15 the metal tubular frame 10 is also improved in that the vibration characteristic thereof becomes less when comparing with the metal frame without foamed core.
  • Figures 4(b) and (a) are the diagrammatic representations of the vibration of the frame 10 constructed according to the invention and the frame without foamed core.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Laminated Bodies (AREA)
EP82305062A 1981-11-27 1982-09-24 Metal racket frame Withdrawn EP0080797A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32537081A 1981-11-27 1981-11-27
US325370 1981-11-27

Publications (2)

Publication Number Publication Date
EP0080797A2 true EP0080797A2 (fr) 1983-06-08
EP0080797A3 EP0080797A3 (en) 1984-03-07

Family

ID=23267608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82305062A Withdrawn EP0080797A3 (en) 1981-11-27 1982-09-24 Metal racket frame

Country Status (1)

Country Link
EP (1) EP0080797A3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2163963A (en) * 1984-09-07 1986-03-12 Dunlop Ltd Games rackets
DE3726441A1 (de) * 1987-08-08 1989-02-16 Tegro Gmbh Schlaeger fuer tennis, squash oder badminton aus einem metallrahmen sowie dessen herstellung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2126488A5 (en) * 1971-02-08 1972-10-06 Carpano & Pons Tennis racquet frame - of stiff lightweight resin lined metal tubing
FR2336952A1 (fr) * 1975-12-31 1977-07-29 Credi Sa Profile ameliore, en particulier pour la realisation de cadres de raquettes de tennis
FR2359619A2 (fr) * 1976-07-29 1978-02-24 Rossignol Sa Raquette de tennis
DE2800572A1 (de) * 1978-01-07 1979-07-12 Reinhold Sommer Rahmen fuer einen tennisschlaeger

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2126488A5 (en) * 1971-02-08 1972-10-06 Carpano & Pons Tennis racquet frame - of stiff lightweight resin lined metal tubing
FR2336952A1 (fr) * 1975-12-31 1977-07-29 Credi Sa Profile ameliore, en particulier pour la realisation de cadres de raquettes de tennis
FR2359619A2 (fr) * 1976-07-29 1978-02-24 Rossignol Sa Raquette de tennis
DE2800572A1 (de) * 1978-01-07 1979-07-12 Reinhold Sommer Rahmen fuer einen tennisschlaeger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2163963A (en) * 1984-09-07 1986-03-12 Dunlop Ltd Games rackets
DE3726441A1 (de) * 1987-08-08 1989-02-16 Tegro Gmbh Schlaeger fuer tennis, squash oder badminton aus einem metallrahmen sowie dessen herstellung

Also Published As

Publication number Publication date
EP0080797A3 (en) 1984-03-07

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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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: LO, KUN NAN

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19840831

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19851113