US20140038754A1 - Next-Generation Wooden Racket - Google Patents

Next-Generation Wooden Racket Download PDF

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Publication number
US20140038754A1
US20140038754A1 US14/112,767 US201214112767A US2014038754A1 US 20140038754 A1 US20140038754 A1 US 20140038754A1 US 201214112767 A US201214112767 A US 201214112767A US 2014038754 A1 US2014038754 A1 US 2014038754A1
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US
United States
Prior art keywords
frame
layers
layer
cross
section
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.)
Abandoned
Application number
US14/112,767
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English (en)
Inventor
Alain Gallais
Alain Zanco
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.)
Lacoste SA
Original Assignee
Lacoste SA
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 Lacoste SA filed Critical Lacoste SA
Assigned to LACOSTE reassignment LACOSTE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ZANCO, ALAIN, GALLAIS, ALAIN
Publication of US20140038754A1 publication Critical patent/US20140038754A1/en
Abandoned 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
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/02—Ballast means for adjusting the centre of mass
    • 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
    • A63B2049/0201—Frames with defined head dimensions
    • A63B2049/0202—Frames with defined head dimensions surface area
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A63B2209/18—Characteristics of used materials biodegradable

Definitions

  • the invention relates to the field of rackets for sport or various ball games.
  • rackets for sport or various ball games.
  • the term “tennis rackets” will be used hereinafter as the main, non-limitative, illustration of the invention.
  • the invention can also apply to other types of-racket, for example squash rackets or any other racket with a mesh delimited by a rigid frame.
  • the object of the present invention is to propose a new racket made principally from wood that uses a large proportion of natural and renewable materials, while offering comparable performance to rackets made from synthetic materials, which currently occupy the entire market or almost the entire market.
  • the invention relates to a racket for ball games, particularly tennis, comprising a frame delimiting a strung surface forming a mesh, a handle extending the frame outside the mesh, characterised in that the frame is formed, at least in a peripheral region, from a bent lamination of at least two layers of different materials placed adjacent to each other, the lamination being shaped so that, in a closed cross-section of said peripheral region, considered perpendicular to the neutral axis of the frame, the centre of mass of said cross-section is offset towards the mesh relative to the centre of area of said cross-section, by a value of at least 5% of the width of said cross-section, said width being defined by the intersection of the cross-section with the plane of the mesh.
  • a tennis racket formed in this way offers excellent performance in terms of handling, weight, mechanical strength, ability to stabilise the frame on large deformations and ability to filter micro-vibrations.
  • a layer of a rigid, structural material on which one or more layers of materials with the aforementioned stabilising and filtering effects can rest is positioned towards the mesh.
  • a central layer is for example intended to stabilise the frame on large vibrations while an outer layer, located away from the mesh, is capable of filtering micro-vibrations.
  • the denser and therefore heavier (by unit of area of the cross-section) layers are located closest to the mesh, which limits the inertia effects relative to a longitudinal axis of the racket, or even relative to the gripping handle of the racket.
  • the less dense and therefore lighter (by unit of area of the cross-section) layers are located on the outer periphery of the frame, on the side furthest from the mesh. These layers are preferably intended to provide good compressive strength of the frame, stabilisation on large deformations and filtration of micro-vibrations.
  • the layers of a racket frame according to the invention are advantageously made from wood (with the exception of an optional reinforcing sheath placed around one of the layers).
  • the frame according to the invention formed in this way uses over 75% natural and renewable materials, which constitutes a particularly strong technical, ecological and commercial argument.
  • the frame is formed from a lamination comprising at least two layers of different materials, a first layer of which, located on the inner side of the frame, has a greater density than the second layer, located on the outer side of the frame.
  • the lamination is formed from at least three layers of at least two different materials.
  • the lamination is formed from at least four layers of at least three different materials.
  • the lamination comprises several layers of different types of wood, said types of wood being chosen from acacia, balsa and walnut.
  • the lamination comprises at least one acacia layer located on the inner side of the frame and delimiting the mesh.
  • Acacia is a wood with excellent mechanical properties. It is a highly responsive and resilient wood. Placed on the inner periphery of the mesh, it forms an excellent support for one of more layers located on the opposite side to the mesh, and due to its density in relation to the other layers, it makes it possible to move the centre of mass of the cross-section towards the centre of the mesh.
  • said at least one acacia layer can be formed of two acacia layers. Said two layers can be arranged so that their fibres are facing in the same direction or, conversely, in another optional variant of the invention, so that their respective fibres are facing in opposite directions.
  • the lamination comprises at least one walnut layer located on the outside of the frame.
  • Walnut is a low-density wood with cross-grain, which gives it an ability to filter micro-vibrations effectively.
  • the lamination comprises at least one balsa layer. This material is appreciated for its great lightness.
  • said at least one balsa layer is inserted between said at least one acacia layer and said at least one walnut layer.
  • Said balsa core has great compressive strength and forms an excellent stabiliser on large deformations.
  • said at least one balsa layer is encased in a sheath made from fibreglass or carbon or a mixture of both. Said sheath contributes to the rigidity and cohesion of all of the adjacent layers.
  • the fibreglass sheath comprises a reinforcement selected from carbon threads or basalt threads.
  • the layers are bonded together by polymerisation of a synthetic resin.
  • the layers of wood of the lamination represent substantially the following proportions in the width of the cross-section:
  • the racket is a tennis racket.
  • FIG. 1 is a partial view of a tennis racket laid flat
  • FIGS. 2 and 3 show a cross-section of the frame of the racket in FIG. 1 along the line A-A, in perspective and perpendicular to the plane of the cross-section respectively, and
  • FIG. 4 is a perspective view of a longitudinal portion of the balsa layer and its composite sheath.
  • FIG. 1 shows the frame of a tennis racket without its handle.
  • the frame 1 delimits a strung surface forming a mesh 2 .
  • the racket is shown without strings.
  • the handle 3 is connected to the frame by two connecting arms 4 , 5 as shown. In a variant (not shown), the handle 3 can be connected to the frame 1 by a single central arm.
  • the frame 1 is formed, at least in a peripheral region, from a bent lamination of at least two layers 6 - 10 of different materials placed adjacent to each other, the lamination being configured so that, in a closed cross-section T of said peripheral region, considered perpendicular to the neutral axis of the frame 1 , the centre of mass M of said cross-section T is offset towards the mesh 2 relative to the centre of area S of said cross-section T, by a value of at least 5% of the width L of said cross-section T, said width being defined by the intersection of the cross-section T with the plane of the mesh 2 .
  • the cross-section is said to be “closed” in the sense that such a cross-section is only considered along a line A-A on one side of the frame 1 only, and not on both diametrically opposite sides.
  • the centre of mass is defined as the centre of weight or barycentre of the cross-section. Said centre of mass takes into account differences in density, or more accurately relative mass, in each area or region of the cross-section.
  • the centre of area is a geometric notion that corresponds to the centre of mass if the entire cross-section were fictitiously homogeneous, i.e. made from the same material with the same density or mass per unit of area in all regions.
  • this offset can for example be 10% or 20% or even more.
  • an offset of the same magnitude is provided between the centre of mass M of the cross-section T and the neutral axis of the frame 1 , the neutral axis conventionally being defined in that it forms a fictitious line in which the tensile or compressive forces are theoretically zero despite the bending of the frame.
  • the frame 1 In the particular embodiment of the invention shown in FIGS. 1 to 3 , provision is made for the frame 1 to be formed homogeneously whatever the peripheral region considered. The cross-sections are thus formed in the same way at any point on the periphery of the frame 1 .
  • the adjacent layers 6 - 9 therefore have a substantially annular shape corresponding to the general shape of the frame 1 .
  • the frame is configured so that, in at least one peripheral region, the mass or weight of the frame is substantially concentrated towards the mesh, i.e. towards the inside of the frame 1 rather than towards the outside.
  • the frame is configured so that said concentration of mass or weight is provided evenly over the entire periphery thereof.
  • the frame 1 is thus formed from a lamination comprising at least two layers 6 - 9 of different materials, a first layer of which, located on the inner side of the frame, has a greater density than the second layer, located on the outer side of the frame.
  • the frame 1 is formed from a lamination with four layers 6 - 9 of three different materials.
  • Said materials are advantageously wood.
  • the types of wood are selected from acacia, balsa, walnut. Said types of wood are bonded and bent in a conventional manner known to a person skilled in the art of wooden rackets. In particular, the layers of wood are oven-bonded together by polymerisation of a synthetic resin.
  • the two layers 6 , 7 located on the inner side of the frame 1 are preferably acacia.
  • acacia is an extremely responsive, resilient wood, arranging it on the inner side of the mesh 2 turns it into a support or bearing element for the other two layers 8 , 9 , which are placed adjacent to it on the outer side from the mesh 2 .
  • As acacia is relatively dense, arranging it on the inner side of the mesh 2 makes it possible to reduce the polar inertia due to the distance of the masses from the centre of the mesh 2 .
  • the two acacia layers are arranged so that their respective fibres are in opposite directions to each other.
  • the layers are thus arranged head to toe. This arrangement increases the rigidity of the two acacia layers, which limits the deformation thereof.
  • the laminated frame 1 also comprises a walnut layer 9 located on the outside of the frame, at least on the outer side in relation to the acacia layers 6 , 7 .
  • Walnut is a low-density wood with cross-grain, which gives it an ability to filter micro-vibrations effectively.
  • the frame 1 of the racket also comprises a balsa layer 8 . This is inserted between the two acacia layers 6 , 7 and the walnut layer 9 . Said balsa core has great compressive strength and forms an excellent stabiliser on large deformations.
  • the balsa layer 8 is encased in a fibreglass sheath 10 , which can be seen in FIGS. 2 to 4 .
  • Said sheath contributes to the rigidity and cohesion of all of the adjacent layers.
  • the sheath 10 is arranged around the balsa layer 8 in such a way as to form a reinforced central layer.
  • the acacia layers 6 , 7 and walnut layer 9 are then placed on either side of said reinforced central balsa layer 8 , 10 prior to bending and bonding.
  • the fibreglass sheath 10 comprises a reinforcement selected from carbon threads or basalt threads.
  • the racket frame 1 is proportionally defined as follows:
  • the frame has a cross-section T with the general shape of a rectangle with rounded edges.
  • the layers 6 - 9 are oriented parallel to the long sides of the rectangle.
  • the frame 1 leaves visible the edges of the different layers 6 - 9 on the opposite parallel faces thereof, which correspond to the short sides of the rectangle.
  • the rectangle is deformed/domed on the inner side, i.e. on the side of the mesh 2 .
  • the two acacia layers 6 , 7 can therefore be of different thicknesses and shapes.
  • a variant embodiment of the invention can comprise a single acacia layer on the inner side of the frame 1 . Provision can also be made for at least two balsa layers or at least two walnut layers on the outer side of the frame 1 .
US14/112,767 2011-04-20 2012-04-19 Next-Generation Wooden Racket Abandoned US20140038754A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1153422 2011-04-20
FR1153422A FR2974307B1 (fr) 2011-04-20 2011-04-20 Raquette en bois de nouvelle generation
PCT/FR2012/050855 WO2012172217A1 (fr) 2011-04-20 2012-04-19 Raquette en bois de nouvelle generation

Publications (1)

Publication Number Publication Date
US20140038754A1 true US20140038754A1 (en) 2014-02-06

Family

ID=46146936

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/112,767 Abandoned US20140038754A1 (en) 2011-04-20 2012-04-19 Next-Generation Wooden Racket

Country Status (6)

Country Link
US (1) US20140038754A1 (fr)
EP (1) EP2699322B1 (fr)
JP (1) JP6002208B2 (fr)
CN (1) CN103561828B (fr)
FR (1) FR2974307B1 (fr)
WO (1) WO2012172217A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3026015B1 (fr) * 2014-09-18 2018-03-23 Decathlon Sa Raquette pour jeu de balles, et procede correspondant

Citations (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2097616A (en) * 1936-03-30 1937-11-02 Theophilus A Davis Racket
US2626804A (en) * 1944-07-19 1953-01-27 Roy H Robinson Racket for tennis and batting games
US2878020A (en) * 1949-12-16 1959-03-17 Roy H Robinson Racket for batting games
US3545755A (en) * 1969-07-09 1970-12-08 Haruo Owada Racket with an inclined frame and twisted handle
US3840230A (en) * 1972-04-05 1974-10-08 Gen Dynamics Corp Game racket
US3856603A (en) * 1972-04-05 1974-12-24 Gen Dynamics Corp Method of manufacturing game rackets
US3889951A (en) * 1972-04-05 1975-06-17 Gen Dynamics Corp Laminated reinforcing facing for a game racket
US4070019A (en) * 1975-12-08 1978-01-24 Groves-Kelco Sales, Inc. Laminated game rackets and method of constructing same
US4147348A (en) * 1975-12-17 1979-04-03 Lee J Kelly Tennis racket providing increased hitting power
US4155550A (en) * 1977-07-14 1979-05-22 Planakis Leo N Offset game racket
US4183528A (en) * 1978-01-26 1980-01-15 An Benjamin J Natural physiological grip for game rackets
US4278251A (en) * 1976-05-05 1981-07-14 Paul Lafourcade Racket frame for ball games
US4360201A (en) * 1979-03-05 1982-11-23 Roy J. Biehl Racquetball or tennis racquet
US4390182A (en) * 1981-05-29 1983-06-28 You Chin San Reinforced racket frame and method of producing same
US4565371A (en) * 1983-04-09 1986-01-21 Ulrich Pawlicki Racket having a handle with different striking characteristics on opposite sides
US4659080A (en) * 1983-06-20 1987-04-21 Stoller Leo D Racquet handle
US4743021A (en) * 1986-06-19 1988-05-10 Gonzales Jr Frank Sports racket having arcuately curved handle
US4983242A (en) * 1988-11-02 1991-01-08 Roland Reed Tennis racquet having a sandwich construction, vibration-dampening frame
US5080361A (en) * 1989-07-19 1992-01-14 Skis Rossignol S.A. Racket for ball games
US5261673A (en) * 1992-04-13 1993-11-16 Sportdesign, Inc. Polyfunctional racket for use in the game of hit and catch
US5960834A (en) * 1994-03-24 1999-10-05 Toray Industries, Inc. Curved pipe and process and apparatus for producing the same
US6083125A (en) * 1998-12-01 2000-07-04 West; David W. Sports racquet with offset angled handle
US7077768B2 (en) * 2004-05-27 2006-07-18 Ef Composite Technologies, L.P. Composite racquet with double tube head frame
US20070117646A1 (en) * 2005-11-19 2007-05-24 Ray Solari Golf club head recess
US7976415B2 (en) * 2006-02-06 2011-07-12 Burt Lionel J Racket with versatile handle
US20120190473A1 (en) * 2011-01-26 2012-07-26 Jason Swist Variable stiffness sports equipment
US20120214624A1 (en) * 2011-02-23 2012-08-23 Edward Allen Stein Racket and a Process that Allows the Entire Length of the Racket Handle Accessible to Receive Insertable and Removable Cartridge Carriers of Various Weights for Play Testing and Racket Customization
US20120214625A1 (en) * 2011-01-26 2012-08-23 Brandt Richard A Tennis racket and method
US8328666B2 (en) * 2009-06-18 2012-12-11 Chien Sheng Hsu Fiber composite and process of manufacture
US20130203529A1 (en) * 2012-01-19 2013-08-08 Revolutionary Tennis Innovations, Llc Sports racket and method of manufacturing same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1180866A (fr) * 1956-08-07 1959-06-10 Sportex G M B H Raquette à cordes
JPS5089132A (fr) * 1973-12-01 1975-07-17
JPS5095040A (fr) * 1973-12-25 1975-07-29
US5417418A (en) * 1992-12-10 1995-05-23 Prince Manufacturing, Inc. Monoshaft composite tennis racquet

Patent Citations (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2097616A (en) * 1936-03-30 1937-11-02 Theophilus A Davis Racket
US2626804A (en) * 1944-07-19 1953-01-27 Roy H Robinson Racket for tennis and batting games
US2878020A (en) * 1949-12-16 1959-03-17 Roy H Robinson Racket for batting games
US3545755A (en) * 1969-07-09 1970-12-08 Haruo Owada Racket with an inclined frame and twisted handle
US3840230A (en) * 1972-04-05 1974-10-08 Gen Dynamics Corp Game racket
US3856603A (en) * 1972-04-05 1974-12-24 Gen Dynamics Corp Method of manufacturing game rackets
US3889951A (en) * 1972-04-05 1975-06-17 Gen Dynamics Corp Laminated reinforcing facing for a game racket
US4070019A (en) * 1975-12-08 1978-01-24 Groves-Kelco Sales, Inc. Laminated game rackets and method of constructing same
US4147348A (en) * 1975-12-17 1979-04-03 Lee J Kelly Tennis racket providing increased hitting power
US4278251A (en) * 1976-05-05 1981-07-14 Paul Lafourcade Racket frame for ball games
US4155550A (en) * 1977-07-14 1979-05-22 Planakis Leo N Offset game racket
US4183528A (en) * 1978-01-26 1980-01-15 An Benjamin J Natural physiological grip for game rackets
US4360201A (en) * 1979-03-05 1982-11-23 Roy J. Biehl Racquetball or tennis racquet
US4390182A (en) * 1981-05-29 1983-06-28 You Chin San Reinforced racket frame and method of producing same
US4565371A (en) * 1983-04-09 1986-01-21 Ulrich Pawlicki Racket having a handle with different striking characteristics on opposite sides
US4659080A (en) * 1983-06-20 1987-04-21 Stoller Leo D Racquet handle
US4743021A (en) * 1986-06-19 1988-05-10 Gonzales Jr Frank Sports racket having arcuately curved handle
US4983242A (en) * 1988-11-02 1991-01-08 Roland Reed Tennis racquet having a sandwich construction, vibration-dampening frame
US5080361A (en) * 1989-07-19 1992-01-14 Skis Rossignol S.A. Racket for ball games
US5261673A (en) * 1992-04-13 1993-11-16 Sportdesign, Inc. Polyfunctional racket for use in the game of hit and catch
US5960834A (en) * 1994-03-24 1999-10-05 Toray Industries, Inc. Curved pipe and process and apparatus for producing the same
US6083125A (en) * 1998-12-01 2000-07-04 West; David W. Sports racquet with offset angled handle
US20060223659A1 (en) * 2004-05-27 2006-10-05 Ef Composite Technologies L.P. Composite racquet with double tube head frame
US7077768B2 (en) * 2004-05-27 2006-07-18 Ef Composite Technologies, L.P. Composite racquet with double tube head frame
US20070117646A1 (en) * 2005-11-19 2007-05-24 Ray Solari Golf club head recess
US7976415B2 (en) * 2006-02-06 2011-07-12 Burt Lionel J Racket with versatile handle
US8328666B2 (en) * 2009-06-18 2012-12-11 Chien Sheng Hsu Fiber composite and process of manufacture
US20130274037A1 (en) * 2009-06-18 2013-10-17 Hsu Chien Sheng Fiber composite and process of manufacture
US20120190473A1 (en) * 2011-01-26 2012-07-26 Jason Swist Variable stiffness sports equipment
US20120214625A1 (en) * 2011-01-26 2012-08-23 Brandt Richard A Tennis racket and method
US20120214624A1 (en) * 2011-02-23 2012-08-23 Edward Allen Stein Racket and a Process that Allows the Entire Length of the Racket Handle Accessible to Receive Insertable and Removable Cartridge Carriers of Various Weights for Play Testing and Racket Customization
US20130203529A1 (en) * 2012-01-19 2013-08-08 Revolutionary Tennis Innovations, Llc Sports racket and method of manufacturing same

Also Published As

Publication number Publication date
FR2974307B1 (fr) 2013-05-24
CN103561828A (zh) 2014-02-05
JP6002208B2 (ja) 2016-10-05
WO2012172217A1 (fr) 2012-12-20
CN103561828B (zh) 2017-01-18
EP2699322B1 (fr) 2019-12-25
EP2699322A1 (fr) 2014-02-26
JP2014511744A (ja) 2014-05-19
FR2974307A1 (fr) 2012-10-26

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AS Assignment

Owner name: LACOSTE, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GALLAIS, ALAIN;ZANCO, ALAIN;SIGNING DATES FROM 20131120 TO 20131209;REEL/FRAME:031806/0128

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION