EP0523913B1 - Striking implements - Google Patents
Striking implements Download PDFInfo
- 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
Links
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 51
- 238000005755 formation reaction Methods 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 47
- 238000013016 damping Methods 0.000 claims abstract description 40
- 230000000295 complement effect Effects 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims description 11
- 238000007373 indentation Methods 0.000 claims description 5
- 229920001187 thermosetting polymer Polymers 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims 1
- 239000000806 elastomer Substances 0.000 claims 1
- 229920003225 polyurethane elastomer Polymers 0.000 claims 1
- 230000035939 shock Effects 0.000 description 8
- 239000000835 fiber Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 241000288673 Chiroptera Species 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000013536 elastomeric material Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 241000333074 Eucalyptus occidentalis Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
Images
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
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Health & Medical Sciences (AREA)
- Golf Clubs (AREA)
- Percussion Or Vibration Massage (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Stringed Musical Instruments (AREA)
- Lock And Its Accessories (AREA)
- Disintegrating Or Milling (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Percussive Tools And Related Accessories (AREA)
- Vibration Prevention Devices (AREA)
- Laminated Bodies (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9115559 | 1991-07-18 | ||
GB919115559A GB9115559D0 (en) | 1991-07-18 | 1991-07-18 | Striking implements |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0523913A1 EP0523913A1 (en) | 1993-01-20 |
EP0523913B1 true EP0523913B1 (en) | 1996-04-17 |
Family
ID=10698584
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92306298A Expired - Lifetime EP0523913B1 (en) | 1991-07-18 | 1992-07-09 | Striking implements |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0523913B1 (zh) |
JP (1) | JPH05184695A (zh) |
CN (1) | CN1050063C (zh) |
AT (1) | ATE136802T1 (zh) |
AU (1) | AU660989B2 (zh) |
DE (1) | DE69209915T2 (zh) |
GB (2) | GB9115559D0 (zh) |
ZA (1) | ZA925356B (zh) |
Cited By (2)
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)
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)
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 |
-
1991
- 1991-07-18 GB GB919115559A patent/GB9115559D0/en active Pending
-
1992
- 1992-06-25 AU AU18526/92A patent/AU660989B2/en not_active Ceased
- 1992-07-09 EP EP92306298A patent/EP0523913B1/en not_active Expired - Lifetime
- 1992-07-09 DE DE69209915T patent/DE69209915T2/de not_active Expired - Fee Related
- 1992-07-09 AT AT92306298T patent/ATE136802T1/de not_active IP Right Cessation
- 1992-07-09 GB GB9214615A patent/GB2257636B/en not_active Expired - Fee Related
- 1992-07-17 JP JP4190954A patent/JPH05184695A/ja active Pending
- 1992-07-17 ZA ZA925356A patent/ZA925356B/xx unknown
- 1992-07-18 CN CN92105912A patent/CN1050063C/zh not_active Expired - Lifetime
Cited By (4)
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 |
---|---|
EP0523913A1 (en) | 1993-01-20 |
DE69209915T2 (de) | 1996-09-19 |
ATE136802T1 (de) | 1996-05-15 |
GB9214615D0 (en) | 1992-08-19 |
GB9115559D0 (en) | 1991-09-04 |
AU660989B2 (en) | 1995-07-13 |
CN1050063C (zh) | 2000-03-08 |
CN1068511A (zh) | 1993-02-03 |
AU1852692A (en) | 1993-01-21 |
ZA925356B (en) | 1994-01-17 |
JPH05184695A (ja) | 1993-07-27 |
DE69209915D1 (de) | 1996-05-23 |
GB2257636A (en) | 1993-01-20 |
GB2257636B (en) | 1995-08-30 |
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