EP0523913B1 - Dispositif de frappe - Google Patents

Dispositif de frappe Download PDF

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Publication number
EP0523913B1
EP0523913B1 EP92306298A EP92306298A EP0523913B1 EP 0523913 B1 EP0523913 B1 EP 0523913B1 EP 92306298 A EP92306298 A EP 92306298A EP 92306298 A EP92306298 A EP 92306298A EP 0523913 B1 EP0523913 B1 EP 0523913B1
Authority
EP
European Patent Office
Prior art keywords
striking
vibration
damping material
striking implement
formations
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.)
Expired - Lifetime
Application number
EP92306298A
Other languages
German (de)
English (en)
Other versions
EP0523913A1 (fr
Inventor
Robert Christopher Haines
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 EP0523913A1 publication Critical patent/EP0523913A1/fr
Application granted granted Critical
Publication of EP0523913B1 publication Critical patent/EP0523913B1/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
    • 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
    • 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
    • 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
    • A63B2102/20—Cricket

Definitions

  • This invention relates to a handheld striking implement which includes a vibration-damping element isolating the portion which is held from the portion used for striking.
  • the present invention provides a striking implement such as a tennis racket which has a discontinuity between the part gripped in use and the part used to strike. It incorporates features in which elements extending from each of the separate parts of the implement overlap in a unique manner and are bonded where they overlap by a vibration-damping material such that the parts are strongly joined together and yet are mechanically isolated one from another so that shock waves and vibration passing from the striking part to the gripping part are substantially absorbed.
  • the product is strong but light and is easy to manufacture.
  • the present invention provides a striking implement which comprises a hollow handle portion and a striking portion, in which the striking implement is discontinuous in that it comprises two parts one part including the striking portion and the other part including at least a part of the hollow handle portion, the said two parts having complementary formations which are assembled to overlap axially with a vibration-damping material interposed therebetween characterised in that the vibration-damping material is bonded to said formations and is in substantially mutually perpendicular planes parallel to the longitudinal axis of the handle portion, whereby said formations are inseparably connected together but mechanically isolated one from another by the vibration-damping material.
  • complementary formations assemble so as to constitute a substantially identical cross-section to that of the remainder of the handle portion.
  • Examples of complementary formations are:
  • the axial overlap of the complementary formations means that the confronting faces extend in planes angled to each other and in a preferred embodiment these planes are substantially perpendicular to each other.
  • the complementary formations are substantially identical but merely rotated through 90° in the final assembly it is possible and convenient to mould in one piece hollow handle portions with formations, cut through the formations, rotate one of the handle portions 90° and then assemble the complementary formations. The assembly must be suitably jigged to align the components prior to the vibration-damping material being injected to fill the gap between the said complementary formations.
  • 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 cures 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. (The hardness and resilience of the vibration-damping materials are measured according to British Standards (B.S.) tests which are internationally available and familiar to the skilled artisan).
  • 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 "Indentation Hardness by Durometer (Shore A)" and resilience below 20% when measured according to BS 903 Part A8 Method B "Method for Rebound Resilience". More preferably the vibration-damping material has a hardness in the range 70 to 95° SHORE A measured according to BS 2782 Part 3 "Indentation Hardness by Durometer (Shore A)", the preferable resilience for the vibration-damping material being in the range 5 to 15% measured according to BS 903 Part A8 Method B "Method for Rebound Resilience".
  • the vibration-damping material is self-bonding to the complementary formations of the two parts of the striking implement i.e. no separate adhesive is required.
  • the aforementioned two-part curable polyurethanes have this desirable property.
  • the handle portion includes only one discontinuity according to the present invention but the handle portion itself may be joined to the striking portion rather than being integral therewith.
  • the present invention is particularly applicable for use in a cricket bat where it is important for the handle to be light, strong and able to absorb at least some of the shock received when the striking portion (i.e. the blade) strikes a cricket ball.
  • the part which includes the handle portion is designed so that the formations are substantially in a plane perpendicular to the face of the striking portion (blade) and thus the formations of the part which includes the blade are in a plane substantially parallel to the face of the blade. This arrangement will improve shock absorbency of the final product.
  • the formation of one part consists of 2 or more fingers which interdigitate with the corresponding 2 or more fingers of the other part it may be preferable to provide a web between the fingers of one said part to reduce bending of the formations when the implement is used for striking and thus to reduce the strain imposed on the bond between the complementary formations.
  • the web should be provided between the formations, the free ends of which will be nearer to the striking portion when the striking implement is in use.
  • Preferred materials for the handle portion are of fibres e.g. of carbon or glass impregnated with a thermosetting or thermoplastics resin. Such compositions can be moulded to give hollow, and thus light, strong handle portions. Particularly for striking implements where there is a high degree of shock in use, e.g. a cricket bat or hockey stick, the fibres may be of material with increased shock absorbency properties e.g. aramid or polyethylene fibres.
  • a part handle portion 1 has formations (fingers) 2 and 3.
  • the part handle portion 1 is hollow and made by wrapping layers of resin impregnated fibre in fabric or 'warp sheet' form around an inflation tube and then moulding under heat and internal pressure, as is well known to those skilled in the art of making hollow articles from polymer composite materials.
  • the inflation tube may be replaced by a plastic material capable of expanding under the action of heat to produce the necessary internal consolidating pressure.
  • Fibre alignment of the wrapping layers is chosen to produce the desirable directional strength in the handle portion, and the fibre type may be chosen to produce desirable properties of enhanced shock absorbency over and above that provided by the vibration-damping material interposed between the complementary formations.
  • a part handle portion 4 is made in the same way and has formations 5 and 6 (which lies behind formation 3 in Figure 3).
  • the complementary formations (fingers) of these two part handle portions are assembled so as to interdigitate and vibration-damping material 7 is injected between the said formations. When the vibration-damping material 7 sets it bonds to the formations.
  • the part handle portions are mechanically isolated but strongly bonded by the vibration-damping material.
  • Such an assembly may be used e.g. as part of a games racket.
  • a cricket bat which incorporates a further embodiment of the present invention consists of a part handle portion 8 with formations 9, 10 assembled with and bonded via a vibration-damping material 11 to complementary formations 12, 13 of part handle portion 14.
  • the handle assembly is hollow and of consolidated resin impregnated fibre composite and is bonded to a wooden blade 15.
  • the main direction in which a cricket ball will strike is shown by the arrow F in Figure 10.
  • the formations 9, 10 of the part handle portion 8 are in a plane perpendicular to the face of the bat and thus there will be improved shock absorbency compared to an arrangement where the formations 9, 10 are in a plane parallel to the face of the bat.
  • the part handle portion 16 has hollow fingers 17 and 18 joined along part of their length by an integral web 19.
  • the part handle portion 20 has hollow fingers 21 and 22 (22 lies behind 21).
  • the complementary formations (fingers) of the two part handle portions shown in Figures 11 and 12 are assembled so as to interdigitate as shown in Figure 13.
  • Vibration-damping material 23 is injected between the said formations including transversely 24 of the longitudinal axis of the striking implement and then set to bond to the formations as shown in Figure 14.
  • the arrow F indicates the direction of the force which will be experienced by the striking implement, whether it be a cricket bat or tennis racket, during use.
  • the web 19 resists the opening of the fingers 17 and 18 which would otherwise occur during use of the striking implement.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Golf Clubs (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Stringed Musical Instruments (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Lock And Its Accessories (AREA)
  • Disintegrating Or Milling (AREA)
  • Vibration Prevention Devices (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Laminated Bodies (AREA)

Claims (18)

  1. Instrument de frappe comprenant une partie formant manche creuse et une partie de frappe, instrument de frappe qui est discontinu en ce sens qu'il se compose de deux éléments dont l'un comprend la partie de frappe et l'autre la partie formant manche creuse, ou une partie de celle-ci, lesdits deux éléments ayant des structures complémentaires qui sont assemblées pour se chevaucher axialement, tandis qu'un matériau amortisseur de vibrations est interposé entre celles-ci, caractérisé en ce que le matériau amortisseur de vibrations (11) est assemblé par adhérence avec lesdites structures (9, 10 et 13, 12) et s'étend dans des plans sensiblement perpendiculaires entre eux et parallèles à l'axe longitudinal de la partie formant manche, pour qu'ainsi lesdites structures (9, 10 et 13, 12) soient reliées l'une à l'autre d'une manière inséparable tout en étant isolées mécaniquement l'une de l'autre par le matériau amortisseur de vibrations (11).
  2. Instrument de frappe selon la revendication 1, caractérisé en ce que les structures complémentaires (9, 10 et 13, 12) se composent chacune d'au moins deux doigts qui s'imbriquent lorsqu'ils sont assemblés.
  3. Instrument de frappe selon la revendication 1 ou 2, caractérisé en ce que le matériau amortisseur de vibrations (11) est un matériau thermodurcissable.
  4. Instrument de frappe selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau amortisseur de vibrations (11) est un matériau injectable.
  5. Instrument de frappe selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau amortisseur de vibrations (11) comprend un élastomère.
  6. Instrument de frappe selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau amortisseur de vibrations (11) comprend un polyuréthane.
  7. Instrument de frappe selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau amortisseur de vibrations (11) possède une dureté supérieure à 60° SHORE A mesurée conformément à la Norme Britannique B.S. 2782, Partie 3 "Détermination de la Dureté à la Pénétration par un Duromètre (Dureté Shore A)" et une élasticité inférieure à 20% mesurée conformément à la Norme Britannique B.S. 903, Partie A8, Méthode B "Méthode relative à l'Elasticité de Rebondissement".
  8. Instrument de frappe selon la revendication 7, caractérisé en ce que le matériau amortisseur de vibrations (11) possède une dureté qui se situe dans la plage de 70 à 95° SHORE A mesurée conformément à la Norme Britannique B.S. 2782, Partie 3 "Détermination de la Dureté à la Pénétration par un Duromètre (Dureté Shore A)".
  9. Instrument de frappe selon la revendication 7 ou 8, caractérisé en ce que le matériau amortisseur de vibrations (11) possède une élasticité qui se situe dans la plage de 5 à 15% mesurée conformément à la Norme Britannique B.S. 903, Partie A8, Méthode B "Méthode relative à l'Elasticité de Rebondissement".
  10. Instrument de frappe selon la revendication 1, 2, 3, 4, 5, 6, 8 ou 9, caractérisé en ce que le matériau amortisseur de vibrations (11) comprend un élastomère de polyuréthane thermodurcissable injectable et possède une dureté de 70 à 95° SHORE A mesurée conformément à la Norme Britannique B.S. 2782, Partie 3 "Détermination de la Dureté à la Pénétration par un Duromètre (Dureté Shore A)" et une élasticité qui se situe dans la plage de 5 à 15% mesurée conformément à la Norme Britannique B.S. 903, Partie A8, Méthode B "Méthode relative à l'Elasticité de Rebondissement".
  11. Instrument de frappe selon l'une quelconque des revendications précédentes, caractérisé en ce que l'instrument de frappe se compose de deux éléments ayant des structures complémentaires (9, 10 et 12, 13) reliées au moyen d'un matériau amortisseur de vibrations (11).
  12. Instrument de frappe selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau amortisseur de vibrations (11) est assemblé par auto-adhérence avec les structures complémentaires (9, 10 et 12, 13) sans adhésif séparé.
  13. Instrument de frappe selon l'une quelconque des revendications précédentes, caractérisé en ce que les structures complémentaires se composent chacune d'au moins deux doigts (17, 18 et 21, 22) qui s'imbriquent lorsqu'ils sont assemblés, et en ce que l'une des structures complémentaires composée d'au moins deux doigts (17, 18) possède une nervure (19) qui relie partiellement les doigts dans le sens de leur longueur.
  14. Instrument de frappe selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau amortisseur de vibrations (11) est interposé entre lesdites structures (9, 10 et 12, 13) et assemblé par adhérence avec celles-ci dans deux plans sensiblement perpendiculaires entre eux qui se coupent sur l'axe de symétrie desdits deux éléments (8, 14) assemblés.
  15. Instrument de frappe selon la revendication 14, caractérisé en ce que l'un au moins des plans perpendiculaires entre eux passe par l'axe longitudinal de l'instrument de frappe.
  16. Méthode de fabrication d'un instrument de frappe comprenant les étapes qui consistent à définir une partie formant manche (8) creuse et une partie de frappe (14, 15), à réaliser des structures complémentaires (9, 10 et 12, 13) dans la partie formant manche creuse et dans la partie de frappe, à assembler axialement les structures complémentaires, à disposer un matériau amortisseur de vibrations (11) entre les structures complémentaires dans des plans sensiblement perpendiculaires entre eux et à obliger ou à autoriser le matériau amortisseur de vibrations (11) à assembler par adhérence lesdites structures complémentaires afin que la partie formant manche creuse et la partie de frappe soient isolées mécaniquement l'une de l'autre tout en étant reliées l'une à l'autre de manière inséparable.
  17. Méthode selon la revendication 16, caractérisée en ce que la partie formant manche creuse et la partie de frappe sont moulées sous la forme d'une seule pièce qui est ensuite découpée, en ce que la partie formant manche (8) creuse et la partie de frappe (14, 15) résultantes qui ont des structures complémentaires (9, 10 et 12, 13) sont alors soumises à une rotation l'une par rapport à l'autre, et en ce que lesdites structures complémentaires sont assemblées axialement afin de s'imbriquer l'une avec l'autre.
  18. Instrument de frappe selon l'une quelconque des revendications 1 à 15, caractérisé en ce que le matériau amortisseur de vibrations s'étend également transversalement (24) par rapport à l'axe longitudinal de l'instrument de frappe.
EP92306298A 1991-07-18 1992-07-09 Dispositif de frappe Expired - Lifetime EP0523913B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919115559A GB9115559D0 (en) 1991-07-18 1991-07-18 Striking implements
GB9115559 1991-07-18

Publications (2)

Publication Number Publication Date
EP0523913A1 EP0523913A1 (fr) 1993-01-20
EP0523913B1 true EP0523913B1 (fr) 1996-04-17

Family

ID=10698584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92306298A Expired - Lifetime EP0523913B1 (fr) 1991-07-18 1992-07-09 Dispositif de frappe

Country Status (8)

Country Link
EP (1) EP0523913B1 (fr)
JP (1) JPH05184695A (fr)
CN (1) CN1050063C (fr)
AT (1) ATE136802T1 (fr)
AU (1) AU660989B2 (fr)
DE (1) DE69209915T2 (fr)
GB (2) GB9115559D0 (fr)
ZA (1) ZA925356B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7789778B2 (en) 2000-09-15 2010-09-07 Easton Sports, Inc. Hockey stick
US8216096B2 (en) 2000-09-15 2012-07-10 Easton Sports, Inc. Hockey stick

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4881268A (en) * 1986-06-17 1989-11-14 Laurel Bank Machines Co., Ltd. Paper money discriminator
GB9205569D0 (en) * 1992-03-13 1992-04-29 Dunlop Ltd Games rackets
US6652398B2 (en) * 2001-08-27 2003-11-25 Innercore Grip Company Vibration dampening grip cover for the handle of an implement
CN2519682Y (zh) * 2001-09-25 2002-11-06 厦门侨兴工业有限公司 球拍的断面结构
GB2391486B (en) * 2002-08-09 2005-08-24 Timothy William Keeley Sports bat handle
US7232386B2 (en) 2003-05-15 2007-06-19 Easton Sports, Inc. Hockey stick
GB2428585B (en) * 2005-07-25 2007-08-01 Grays Of Cambridge Ltd Cricket bat
US7914403B2 (en) 2008-08-06 2011-03-29 Easton Sports, Inc. Hockey stick
US20140243120A1 (en) * 2013-02-26 2014-08-28 Easton Sports, Inc. Multi-piece shaft for a lacrosse stick

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB452607A (en) * 1935-07-01 1936-08-26 John Bernard Dickson Improvements in or relating to badminton rackets
GB478008A (en) * 1935-11-13 1938-01-11 Edward James Horace Brooks Improvements in handles for cricket bats and the like
FR827983A (fr) * 1937-10-15 1938-05-06 Raquette perfectionnée pour jeu de tennis et jeux analogues
US4609198A (en) * 1983-11-08 1986-09-02 Tarr Robert G Racket handle assembly having vibration dampening characteristics
US4983242A (en) * 1988-11-02 1991-01-08 Roland Reed Tennis racquet having a sandwich construction, vibration-dampening frame
GB2230458B (en) * 1989-04-11 1993-04-21 Jung Ching Peng Shock absorbing racket
US5071125A (en) * 1991-05-08 1991-12-10 Walter Shen Racket

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7789778B2 (en) 2000-09-15 2010-09-07 Easton Sports, Inc. Hockey stick
US7850553B2 (en) 2000-09-15 2010-12-14 Easton Sports, Inc. Hockey stick
US8216096B2 (en) 2000-09-15 2012-07-10 Easton Sports, Inc. Hockey stick
US8517868B2 (en) 2000-09-15 2013-08-27 Easton Sports, Inc. Hockey stick

Also Published As

Publication number Publication date
DE69209915T2 (de) 1996-09-19
GB2257636B (en) 1995-08-30
CN1068511A (zh) 1993-02-03
DE69209915D1 (de) 1996-05-23
ATE136802T1 (de) 1996-05-15
EP0523913A1 (fr) 1993-01-20
JPH05184695A (ja) 1993-07-27
AU1852692A (en) 1993-01-21
GB9214615D0 (en) 1992-08-19
CN1050063C (zh) 2000-03-08
ZA925356B (en) 1994-01-17
AU660989B2 (en) 1995-07-13
GB2257636A (en) 1993-01-20
GB9115559D0 (en) 1991-09-04

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