EP0455349B1 - Games racket frame - Google Patents
Games racket frame Download PDFInfo
- Publication number
- EP0455349B1 EP0455349B1 EP91302882A EP91302882A EP0455349B1 EP 0455349 B1 EP0455349 B1 EP 0455349B1 EP 91302882 A EP91302882 A EP 91302882A EP 91302882 A EP91302882 A EP 91302882A EP 0455349 B1 EP0455349 B1 EP 0455349B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vibration
- frame
- frame according
- damping material
- 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.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 claims abstract description 37
- 238000013016 damping Methods 0.000 claims abstract description 33
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 18
- 230000008878 coupling Effects 0.000 claims description 25
- 238000010168 coupling process Methods 0.000 claims description 25
- 238000005859 coupling reaction Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 13
- 238000007373 indentation Methods 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 229920003225 polyurethane elastomer Polymers 0.000 claims description 2
- 208000027418 Wounds and injury Diseases 0.000 abstract description 3
- 208000002240 Tennis Elbow Diseases 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000006378 damage Effects 0.000 abstract description 2
- 208000014674 injury Diseases 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract description 2
- 239000013536 elastomeric material Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229920005749 polyurethane resin Polymers 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000004744 fabric 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
- 238000002955 isolation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000002023 wood 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
- 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.
- a two part games racket frame is described in US Patent Specification No. 4367871 (Schiefer) which has a head portion for stringing, a shaft portion and a handle portion, the frame being in two parts i.e. discontinuous, the discontinuity being in the handle. Between the two parts is a flexible key member held in place by one or more rigid members each of which is in contact with both parts of the racket.
- the purpose of the discontinuous racket frame is as a training aid.
- 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 whch 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 a 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 and one or more reinforcing members engaging the connecting member and being located so as to overlap both of the said two parts characterised in that the connecting member is 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 connecting member which is a thermoset vibration-damping material comprising a polyurethane elastomer having a rebound resilience in the range 5 to 15% measured according to British Standard B.S.
- vibration-damping material has its usual meaning of the art i.e. a material of low resilience where resilience is defined as the percentage of energy returned after putting energy in in terms of a force-deflection.
- resilience is defined as the percentage of energy returned after putting energy in in terms of a force-deflection.
- B.S. 903 Part A8 : 1990 : Method B a pendulum is dropped onto an elastomeric sample and the percentage rebound is measured which at 5 to 15% means that 95 to 85% of the energy is absorbed by the elastomer, this indicating an excellent vibration-damping material.
- the vibration-damping material may especially be an injectable material, for example a polyurethane resin.
- a suitable material may be based upon an elastomeric material compound 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 : Method 365B : 1992 : Determination of Indentation Hardness by Durometer, and resilience below 20% when measured according to BS 903 Part A8 : 1990 : Method B : Method for Rebound Resilience.
- the vibration-damping material has a hardness in the range 70 to 95° SHORE A measured according to BS 2782 Part 3 Method 365B : 1992 Determination of Indentation Hardness by Durometer, the preferable resilience for the vibration-damping material being in the range 5 to 15% measured according to BS 903 Part A8 : 1990 : Method B : Method for Rebound Resilience.
- 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 correspondng to that of the vbibration-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 dimensions were as follows :
- 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)
- Fishing Rods (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
- Vibration Dampers (AREA)
- Laminated Bodies (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB909009831A GB9009831D0 (en) | 1990-05-02 | 1990-05-02 | Games racket frame |
GB9009831 | 1990-05-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0455349A1 EP0455349A1 (en) | 1991-11-06 |
EP0455349B1 true EP0455349B1 (en) | 1994-06-22 |
Family
ID=10675324
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91302882A Expired - Lifetime EP0455349B1 (en) | 1990-05-02 | 1991-04-02 | Games racket frame |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0455349B1 (zh) |
JP (1) | JP3021754B2 (zh) |
CN (1) | CN1041802C (zh) |
AT (1) | ATE107522T1 (zh) |
AU (1) | AU645550B2 (zh) |
DE (1) | DE69102582T2 (zh) |
ES (1) | ES2055533T3 (zh) |
GB (2) | GB9009831D0 (zh) |
MY (1) | MY106502A (zh) |
ZA (1) | ZA913268B (zh) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2057180C (en) * | 1991-12-11 | 1998-06-30 | Chin-San You | Shock-absorbing racket frame made from fiber reinforced plastic material |
EP0550121B1 (en) * | 1992-01-08 | 1995-12-20 | Chin-San You | Racket frame |
US5263712A (en) * | 1992-09-18 | 1993-11-23 | Lo Pi Tuan | Game racket having fiber reinforced shaft |
CA2174696A1 (en) * | 1996-04-22 | 1997-10-23 | Charles Dicerbo | Sports racket |
US5728008A (en) * | 1997-02-10 | 1998-03-17 | Media Group | Ball striking device with means of imparting enhanced forward momentum to the ball |
GB2436296A (en) * | 2006-03-24 | 2007-09-26 | Dunlop Slazenger Group Ltd | Connecting means for connecting parts of a ball or like hitting appliance |
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 |
ES2585041B1 (es) * | 2015-04-01 | 2017-07-17 | Foam System Plus, S.L. | Procedimiento de fabricación de un marco para una pala de pádel |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE2720T1 (de) * | 1979-08-24 | 1983-03-15 | Dunlop Limited | Schlaegerrahmen. |
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 |
GB8422666D0 (en) * | 1984-09-07 | 1984-10-10 | Dunlop Ltd | Games rackets |
WO1986004251A1 (fr) * | 1985-01-24 | 1986-07-31 | Patrick Jeanrot | Raquette de jeux de balles a monture ou carcasse pliante et separable |
ZA867666B (en) * | 1985-10-11 | 1987-05-27 | Fin Sports Ltd | Racquet vibration absorbing device |
FR2608444B1 (fr) * | 1986-12-22 | 1989-03-31 | Rossignol Sa | Raquette de tennis |
GB8828143D0 (en) * | 1988-12-02 | 1989-01-05 | Dunlop Ltd | Vibration-damping assembly for games rackets |
-
1990
- 1990-05-02 GB GB909009831A patent/GB9009831D0/en active Pending
-
1991
- 1991-04-02 ES ES91302882T patent/ES2055533T3/es not_active Expired - Lifetime
- 1991-04-02 DE DE69102582T patent/DE69102582T2/de not_active Expired - Fee Related
- 1991-04-02 EP EP91302882A patent/EP0455349B1/en not_active Expired - Lifetime
- 1991-04-02 GB GB9106906A patent/GB2243790B/en not_active Expired - Lifetime
- 1991-04-02 AT AT91302882T patent/ATE107522T1/de not_active IP Right Cessation
- 1991-04-12 AU AU74363/91A patent/AU645550B2/en not_active Ceased
- 1991-04-22 MY MYPI91000656A patent/MY106502A/en unknown
- 1991-04-30 ZA ZA913268A patent/ZA913268B/xx unknown
- 1991-04-30 CN CN91102767A patent/CN1041802C/zh not_active Expired - Lifetime
- 1991-05-01 JP JP3100171A patent/JP3021754B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP3021754B2 (ja) | 2000-03-15 |
DE69102582D1 (de) | 1994-07-28 |
CN1056060A (zh) | 1991-11-13 |
JPH04227284A (ja) | 1992-08-17 |
AU645550B2 (en) | 1994-01-20 |
GB2243790A (en) | 1991-11-13 |
AU7436391A (en) | 1991-11-07 |
ATE107522T1 (de) | 1994-07-15 |
ES2055533T3 (es) | 1994-08-16 |
GB9106906D0 (en) | 1991-05-22 |
GB2243790B (en) | 1993-11-24 |
DE69102582T2 (de) | 1994-10-20 |
MY106502A (en) | 1995-06-30 |
ZA913268B (en) | 1992-12-30 |
EP0455349A1 (en) | 1991-11-06 |
GB9009831D0 (en) | 1990-06-27 |
CN1041802C (zh) | 1999-01-27 |
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