EP0455349A1 - Cadre de raquette pour jeux - Google Patents

Cadre de raquette pour jeux Download PDF

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Publication number
EP0455349A1
EP0455349A1 EP91302882A EP91302882A EP0455349A1 EP 0455349 A1 EP0455349 A1 EP 0455349A1 EP 91302882 A EP91302882 A EP 91302882A EP 91302882 A EP91302882 A EP 91302882A EP 0455349 A1 EP0455349 A1 EP 0455349A1
Authority
EP
European Patent Office
Prior art keywords
vibration
damping material
frame according
frame
parts
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
EP91302882A
Other languages
German (de)
English (en)
Other versions
EP0455349B1 (fr
Inventor
Robert Christopher Haines
Michael Edward Curtis
Andrew John Marsden
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.)
Dunlop Ltd
Original Assignee
Dunlop 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
Application filed by Dunlop Ltd filed Critical Dunlop Ltd
Publication of EP0455349A1 publication Critical patent/EP0455349A1/fr
Application granted granted Critical
Publication of EP0455349B1 publication Critical patent/EP0455349B1/fr
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
    • A63B49/02—Frames
    • A63B49/03—Frames characterised by throat sections, i.e. sections or elements between the head and the shaft
    • 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
    • A63B49/035—Frames with easily dismountable parts, e.g. heads, shafts or grips
    • 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
    • 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
    • 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 a games racket frame which includes a vibration-damping element isolating the head portion of the racket from the handle portion.
  • the portion of the racket which is gripped by the player i.e. the handle portion is effectively decoupled and mechanically isolated from the portion of the racket which is impacted by the ball or other projectile.
  • the present invention provides a games racket frame having a head portion for stringing, a shaft portion and a handle portion, the frame being discontinuous in that it comprises two parts of which one part includes the head portion and the other part includes the handle portion or part thereof, in which the said two parts are connected together by means of a coupling assembly, the said coupling assembly comprising a connecting member of a vibration-damping material and one or more reinforcing members engaging the vibration-damping material and being located so as to overlap both of the said two parts, the vibration-damping material being bonded to the said two parts and to each of the said reinforcing members, whereby the said two parts are inseparably connected together, but mechanically isolated one from the other, by the vibration-damping material.
  • the vibration-damping material may suitably be a thermosetting or a thermoplastics material and especially an injectable material, for example a polyurethane resin.
  • a suitable material may be based upon an elastomeric material compounded to produce the properties of a vibration-damping material.
  • a preferred polyurethane resin comprises an injectable thermosetting elastomeric material particularly in the form of a two-part, curable polyurethane which is mixed in liquid form and can therefore be readily injected and subsequently cured in situ .
  • a material is available from Compounding Ingredients Limited as CILCAST 101 (which is cured by the addition of CILCURE B).
  • CILCAST and CILCURE are Registered Trade Marks.
  • Such a material has the properties desirable for the vibration-damping material of the present invention being of a hardness greater than 60° SHORE A measured according to BS 2782 Part 3 and resilience below 20% when measured according to BS 903 Part A8 Method B.
  • the vibration-damping material has a hardness in the range 70 to 95° SHORE A measured according to BS 2782 Part 3, the preferable resilience for the vibration-damping material being in the range 5 to 15% measured according to BS 903 Part A8 Method B.
  • the vibration-damping material is self-bonding to the reinforcing members and the two parts of the racket frame i.e. no separate adhesive is required.
  • the aforementioned two-part curable polyurethanes have this desirable property.
  • the reinforcing member consists of a sleeve or collar to be located on the exterior of the frame in a position corresponding to that of the vibration-damping material.
  • those portions of the frame which are to be connected by the coupling assembly are of reduced external diameter, whereby the sleeve or collar lies flush with the remaining portions of the frame on either side of the coupling assembly.
  • the sleeve or collar may be provided with one or more keying portions to engage the vibration-damping material.
  • the reinforcing member includes one or more rods extending across the discontinuity between the two frame parts, to be located within the vibration-damping material.
  • the or each rod may be provided with one or more keying portions to engage the vibration-damping material.
  • the or each rod may be integrally formed with the collar or sleeve, for example a rod may extend along the longitudinal axis of the collar or sleeve.
  • the reinforcing member consists of a plate to be located within the vibration-damping material. Those parts of the frame which are connected by means of the coupling assembly may be provided with rebates to receive the plate. Additional reinforcing means, such as one or more pins extending in a radial direction through each frame part and the plate, may be provided.
  • the games racket frame is in two parts only i.e. only one coupling assembly is used. It may be possible to have more than one coupling assembly in which case the frame would be in three or more parts.
  • a racket frame comprises a head 10 for stringing, a hollow shaft 11 and a handle 12.
  • the shaft is cut through at 13 and the shaft and handle are subsequently connected by means of a coupling assembly 14.
  • the coupling assembly 14 consists of a sleeve or collar 20 surrounding the shaft at the position 13 of the cut.
  • the region between the co-operating ends of the shaft 11 and handle 12 is filled with an elastomeric material 21, injected through an injection-hole 22 in the sleeve 20 and retained in position by means of plugs 23 and 24.
  • a reinforcing rod 25 is contained within the elastomeric material 21.
  • the shaft 11 and handle 12 are respectively provided with portions 11A and 12A of reduced external diameter, so that on completion of the coupling assembly the sleeve 20 will lie flush with the remaining portions of the shaft and handle.
  • the reinforcing member comprises a generally cylindrical sleeve 31 with an integral rod 32 extending along the longitudinal axis of the sleeve.
  • reinforcing member 40 again comprises a generally cylindrical sleeve with an integral rod extending along the longitudinal axis of the sleeve, but including keying portions (indicated at 41 and 42) for enhanced attachment to the elastomeric material.
  • Figure 5 is a schematic view of a tennis racket frame having a head/shaft portion 50 and a handle/shaft portion 51.
  • the preferred position of separation of the portions 50 and 51 is shown at 52 and the dimensions of portions 50 and 51 are indicated by a, b, c and d respectively.
  • the dimension "d" (distance from the butt of the handle to the point of separation of the two portions 50 and 51) may be in the range 40 mm to 330 mm, preferably 100 mm to 200 mm and ideally about 150 mm.
  • the coupling assembly is positioned such that in the finished games racket it would be covered by a grip (e.g. of wound leather) and thus would be within the handle portion.
  • a grip e.g. of wound leather
  • This preferred construction would usually be satisfied by the dimension "d" of being in the range 100 mm to 200 mm.
  • the frame portions 60 and 61 are separated at a point of discontinuity 62.
  • the portions are subsequently connected by means of a coupling assembly comprising a sleeve 63 and an element 64 of an elastomeric material, element 64 being retained in position by plugs 65 and 66.
  • the coupling assembly includes rods 67 contained within the elastomeric material 64.
  • frame portions 80 and 81 are provided with rebates 82 and 83 respectively to receive a reinforcing plate 84.
  • the frame portions and the plate are drilled to receive pins 85 and 86 made from vibration-damping material.
  • a sleeve 87 surrounds the assembly, which is completed by the injection of elastomeric material 88 through injection hole 89 in the sleeve. The orientation of the assembly is such that the plate 84 is perpendicular to the plane of the strings of the finished racket.
  • frame parts 101 and 102 are separated at a point of discontinuity 103.
  • Parts 101 and 102 are respectively provided with portions 101A and 102A of reduced diameter, the said portions 101A and 102A being of closed, generally dumbbell section.
  • the frame parts 101 and 102 are connected by means of a coupling assembly comprising a sleeve 104, rods 105 and 106 and an element 107 of an elastomeric material, element 107 being retained in position by plugs 108 and 109 and having been injected through injection hole 110.
  • the two parts of the racket frame to be connected may be provided with co-operating flanges, in the manner of a pipe-joint, wherein the vibration-damping material acts as a gasket between the flanges.
  • One of the frames was cut through at a position 135 mm from the end of the shaft and a sleeve measuring 50 mm in length was located in position.
  • the racket frames were subsequently finished to the same weight and balance by affixing leather grips and by stringing in the customary way.
  • a test for vibration decay was made on the two rackets by fixing an accelerometer to the grip in each case and connecting this device to an oscillograph. Vibrations were set up in the frame by striking the strung area with a ball and the rate of vibration decay was measured in the two cases. Damping factors (see below) were computed for each racket and the following results were obtained : in which A1 and A2 are the amplitudes of two successive vibration peaks taken from oscillograph readings of decaying vibrations.
  • Racket frames according to the present invention may be made of wood, metal or composite materials.
  • the present invention also relates to a games racket including a frame as hereinbefore described.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Pulmonology (AREA)
  • Vibration Prevention Devices (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Toys (AREA)
  • Laminated Bodies (AREA)
  • Fishing Rods (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Vibration Dampers (AREA)
EP91302882A 1990-05-02 1991-04-02 Cadre de raquette pour jeux Expired - Lifetime EP0455349B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9009831 1990-05-02
GB909009831A GB9009831D0 (en) 1990-05-02 1990-05-02 Games racket frame

Publications (2)

Publication Number Publication Date
EP0455349A1 true EP0455349A1 (fr) 1991-11-06
EP0455349B1 EP0455349B1 (fr) 1994-06-22

Family

ID=10675324

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91302882A Expired - Lifetime EP0455349B1 (fr) 1990-05-02 1991-04-02 Cadre de raquette pour jeux

Country Status (10)

Country Link
EP (1) EP0455349B1 (fr)
JP (1) JP3021754B2 (fr)
CN (1) CN1041802C (fr)
AT (1) ATE107522T1 (fr)
AU (1) AU645550B2 (fr)
DE (1) DE69102582T2 (fr)
ES (1) ES2055533T3 (fr)
GB (2) GB9009831D0 (fr)
MY (1) MY106502A (fr)
ZA (1) ZA913268B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0546224A1 (fr) * 1991-12-11 1993-06-16 Chin-San You Cadre de raquette
EP0550121A1 (fr) * 1992-01-08 1993-07-07 Chin-San You Cadre de raquette
EP0803271A3 (fr) * 1996-04-22 1999-08-18 Boz Sports International Ltd. Raquette à cadre divisé
GB2436296A (en) * 2006-03-24 2007-09-26 Dunlop Slazenger Group Ltd Connecting means for connecting parts of a ball or like hitting appliance
ES2585041A1 (es) * 2015-04-01 2016-10-03 Foam System Plus, S.L. Procedimiento de fabricación de un marco para una pala de pádel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5263712A (en) * 1992-09-18 1993-11-23 Lo Pi Tuan Game racket having fiber reinforced shaft
US5728008A (en) * 1997-02-10 1998-03-17 Media Group Ball striking device with means of imparting enhanced forward momentum to the ball
JP6147053B2 (ja) * 2013-03-28 2017-06-14 ダンロップスポーツ株式会社 ラケットフレーム

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4340226A (en) * 1979-08-24 1982-07-20 Dunlop Limited Games racket
US4367871A (en) * 1980-07-25 1983-01-11 Schiefer William E Articulable training device for racquet sports and the like
DE3531861A1 (de) * 1984-09-07 1986-03-20 Dunlop Ltd., London Spiel-racket
US4600194A (en) * 1983-12-22 1986-07-15 Donnelly Norbert B Anti-vibration device for sports rackets
WO1986004251A1 (fr) * 1985-01-24 1986-07-31 Patrick Jeanrot Raquette de jeux de balles a monture ou carcasse pliante et separable
US4609198A (en) * 1983-11-08 1986-09-02 Tarr Robert G Racket handle assembly having vibration dampening characteristics
EP0221688A2 (fr) * 1985-10-11 1987-05-13 Fin Sports Limited Raquette munie d'un dispositif absorbant les vibrations
US4875679A (en) * 1986-12-22 1989-10-24 Societe Skis Rossignol S.A. Tennis racket

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8828143D0 (en) * 1988-12-02 1989-01-05 Dunlop Ltd Vibration-damping assembly for games rackets

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4340226A (en) * 1979-08-24 1982-07-20 Dunlop Limited Games racket
US4367871A (en) * 1980-07-25 1983-01-11 Schiefer William E Articulable training device for racquet sports and the like
US4609198A (en) * 1983-11-08 1986-09-02 Tarr Robert G Racket handle assembly having vibration dampening characteristics
US4600194A (en) * 1983-12-22 1986-07-15 Donnelly Norbert B Anti-vibration device for sports rackets
DE3531861A1 (de) * 1984-09-07 1986-03-20 Dunlop Ltd., London Spiel-racket
WO1986004251A1 (fr) * 1985-01-24 1986-07-31 Patrick Jeanrot Raquette de jeux de balles a monture ou carcasse pliante et separable
EP0221688A2 (fr) * 1985-10-11 1987-05-13 Fin Sports Limited Raquette munie d'un dispositif absorbant les vibrations
US4875679A (en) * 1986-12-22 1989-10-24 Societe Skis Rossignol S.A. Tennis racket

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0546224A1 (fr) * 1991-12-11 1993-06-16 Chin-San You Cadre de raquette
EP0550121A1 (fr) * 1992-01-08 1993-07-07 Chin-San You Cadre de raquette
EP0803271A3 (fr) * 1996-04-22 1999-08-18 Boz Sports International Ltd. Raquette à cadre divisé
GB2436296A (en) * 2006-03-24 2007-09-26 Dunlop Slazenger Group Ltd Connecting means for connecting parts of a ball or like hitting appliance
ES2585041A1 (es) * 2015-04-01 2016-10-03 Foam System Plus, S.L. Procedimiento de fabricación de un marco para una pala de pádel

Also Published As

Publication number Publication date
JPH04227284A (ja) 1992-08-17
CN1056060A (zh) 1991-11-13
MY106502A (en) 1995-06-30
GB9009831D0 (en) 1990-06-27
CN1041802C (zh) 1999-01-27
ES2055533T3 (es) 1994-08-16
GB2243790A (en) 1991-11-13
DE69102582T2 (de) 1994-10-20
AU7436391A (en) 1991-11-07
GB9106906D0 (en) 1991-05-22
AU645550B2 (en) 1994-01-20
DE69102582D1 (de) 1994-07-28
EP0455349B1 (fr) 1994-06-22
GB2243790B (en) 1993-11-24
ATE107522T1 (de) 1994-07-15
JP3021754B2 (ja) 2000-03-15
ZA913268B (en) 1992-12-30

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