EP1060767A2 - Raquette - Google Patents

Raquette Download PDF

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Publication number
EP1060767A2
EP1060767A2 EP00305069A EP00305069A EP1060767A2 EP 1060767 A2 EP1060767 A2 EP 1060767A2 EP 00305069 A EP00305069 A EP 00305069A EP 00305069 A EP00305069 A EP 00305069A EP 1060767 A2 EP1060767 A2 EP 1060767A2
Authority
EP
European Patent Office
Prior art keywords
frame
games racket
racket according
concave region
strings
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.)
Withdrawn
Application number
EP00305069A
Other languages
German (de)
English (en)
Other versions
EP1060767A3 (fr
Inventor
Richard G. Perry
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 International Group Ltd
Original Assignee
Dunlop Slazenger Group 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 Slazenger Group Ltd filed Critical Dunlop Slazenger Group Ltd
Publication of EP1060767A2 publication Critical patent/EP1060767A2/fr
Publication of EP1060767A3 publication Critical patent/EP1060767A3/fr
Withdrawn legal-status Critical Current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
    • A63B49/022—String guides on frames, e.g. grommets
    • 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
    • A63B49/028—Means for achieving greater mobility of the string bed
    • 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
    • A63B2049/0217—Frames with variable thickness of the head in the string plane

Definitions

  • This invention relates to the head of a racket used for tennis, squash or badminton where the head is defined as the part of the racket that contains the strings.
  • the frame of the head must be strong and stiff so that it can resist the total force exerted by the tension of the strings which can in a tennis racket amount to around 500 kg force in each of the directions of the main and cross strings. Also, the frame of the head must resist bending in a sense perpendicular to the plane of the strings in a cantilever fashion. This means that the section through the head frame must be capable of providing high cantilever stiffness (i.e. along the axis of the frame section) but, due to the generally ovoid plan of racket heads, in general high torsional stiffness must also be provided by the racket head section.
  • High cantilever and high torsional stiffness together in the head section thus provide a racket head which resists distortion to loads applied perpendicular to the string plane as occur when a ball or shuttlecock is struck in the course of play.
  • normally rackets have evolved with circular, ovoid, square, or rectangular head cross-sections. Additionally, rackets with such cross sections are easy to manufacture.
  • the purpose of the invention described here is to define a cross section for the head of a racket which optimises the above requirements and which alternatively may be varied around the head of the racket to impart other desirable characteristics.
  • a games racket having a head providing a frame for a bed of strings, the strings entering holes in the frame, and at least part of the frame having a cross-section which is concave in a region where the strings enter the holes, whereby the actual area occupied by the bed of strings exceeds its visible area when viewing the racket face on.
  • the present invention can increase the strung area of the head in relation to the overall dimensions of the head.
  • the concave region is combined with a curved outer cross-section of the frame to produce a crescent-shaped overall cross-section.
  • the concave region may be provided all around the inner perimeter of the head. Alternatively, it may be provided only in one or more distinct parts of the frame. In a preferred embodiment, just the upper part of the racket opposite the handle (for example, the top half) is provided with the concave section.
  • the concave region need not be of constant shape or depth, but can vary with position around the frame, or may vary in relation to the string holes (e.g. deeper around the holes than away from the holes).
  • the concavity preferably increases gradually with a smooth transition from the non-concave to the concave part.
  • the basis of the invention is to specify a section through the head frame which is essentially concave in a sense that the concavity exists along its inner perimeter, i.e. on the side of the frame where the strings enter the section as shown in Figure 1.
  • the concavity may be incorporated into what is otherwise a square, rectangular or ovoid section as shown in Figures 2, 3 and 4 and may be an essentially crescent section as shown in Figure 5.
  • maximising stringing area can be a prime design limitation.
  • the effect of maximising string area is to increase the "power" that can be generated by the racket - that is the ball speed produced on striking, for instance a tennis ball.
  • the section is used around part of the racket head only, for instance from positions defined on a clock face say from 9 o'clock to 3 o'clock as shown in Figure 7.
  • the concave section forms a single continuous concave region around all or part of the racket head.
  • this is not essential and a similar effect may be obtained by providing a plurality of distinct concave regions (i.e. portions around the head frame in which the concave section is formed).
  • it is possible to provide local regions of concavity such that areas on the inner perimeter of the frame immediately around the strings are concave (recessed), whereas areas away from the strings are less concave or not at all concave. The effect is still provided of allowing the strings to vibrate over a larger area than would otherwise be possible.
  • Figures 1 to 5 illustrate possible cross-sections at a pair of points through the head frame; however, it is not essential for the cross-sectional shape to stay the same all around the frame.
  • the concave section may be made more or less pronounced as one proceeds around the frame, for example more pronounced towards the apex of the racket (12 o'clock position), and less so towards the sides (9 o'clock and 3 o'clock positions).
  • the concavity may begin as a smooth transition from a normal (flat or convex) inner cross-section at a position corresponding to 7 o'clock, increase as one proceeds clockwise around the head frame to a predetermined depth which is maintained around the apex of the frame, and decrease from the predetermined depth to finally reach zero (back to a non-concave section) at the 5 o'clock position.
  • the present invention is particularly applicable to tennis rackets but may also be usefully applied to rackets for other sports including squash and badminton.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Golf Clubs (AREA)
  • Fishing Rods (AREA)
EP00305069A 1999-06-17 2000-06-15 Raquette Withdrawn EP1060767A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9914090.7A GB9914090D0 (en) 1999-06-17 1999-06-17 Improved games racket
GB9914090 1999-06-17

Publications (2)

Publication Number Publication Date
EP1060767A2 true EP1060767A2 (fr) 2000-12-20
EP1060767A3 EP1060767A3 (fr) 2003-04-23

Family

ID=10855506

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00305069A Withdrawn EP1060767A3 (fr) 1999-06-17 2000-06-15 Raquette

Country Status (4)

Country Link
EP (1) EP1060767A3 (fr)
JP (1) JP2001009067A (fr)
CN (1) CN1277880A (fr)
GB (2) GB9914090D0 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006004849A1 (de) * 2006-02-02 2007-08-09 Head Technology Gmbh Ballspielschläger mit Schwingungseinrichtung
WO2007088070A2 (fr) * 2006-02-02 2007-08-09 Head Technology Gmbh Raquette
DE102006004863A1 (de) * 2006-02-02 2007-08-09 Head Technology Gmbh Schläger für Ballspiele
US8012043B2 (en) 2006-02-02 2011-09-06 Head Technology Gmbh Grip tape and grip for ball game racket
JP2014171526A (ja) * 2013-03-06 2014-09-22 Yonex Co Ltd ラケット

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899172A (en) * 1969-08-28 1975-08-12 Maark Corp Tennis racket having improved strength factor
US4204681A (en) * 1978-07-13 1980-05-27 Amf Incorporated Game ball racket wherein certain racket components are structurally integrated with the racket frame by the string with which the racket is strung
US5014987A (en) * 1982-09-27 1991-05-14 Soong Tsai C Frame for sports racket
US5082266A (en) * 1990-08-30 1992-01-21 Lo Kun Nan Racket head with inner peripheral indentations
US5460370A (en) * 1993-11-29 1995-10-24 Tung-Han; Lai Structure of racket

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1581466A (en) * 1977-07-28 1980-12-17 Goransson G P M Racket
DE3379712D1 (en) * 1982-09-27 1989-06-01 Soong Tsai C Frame for sports racket

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899172A (en) * 1969-08-28 1975-08-12 Maark Corp Tennis racket having improved strength factor
US4204681A (en) * 1978-07-13 1980-05-27 Amf Incorporated Game ball racket wherein certain racket components are structurally integrated with the racket frame by the string with which the racket is strung
US5014987A (en) * 1982-09-27 1991-05-14 Soong Tsai C Frame for sports racket
US5082266A (en) * 1990-08-30 1992-01-21 Lo Kun Nan Racket head with inner peripheral indentations
US5460370A (en) * 1993-11-29 1995-10-24 Tung-Han; Lai Structure of racket

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006004849A1 (de) * 2006-02-02 2007-08-09 Head Technology Gmbh Ballspielschläger mit Schwingungseinrichtung
WO2007088070A2 (fr) * 2006-02-02 2007-08-09 Head Technology Gmbh Raquette
DE102006004863A1 (de) * 2006-02-02 2007-08-09 Head Technology Gmbh Schläger für Ballspiele
DE102006004863B4 (de) * 2006-02-02 2007-12-27 Head Technology Gmbh Schläger für Ballspiele
DE102006004849B4 (de) * 2006-02-02 2008-01-03 Head Technology Gmbh Ballspielschläger mit Schwingungseinrichtung
WO2007088070A3 (fr) * 2006-02-02 2008-02-28 Head Technology Gmbh Raquette
US7967706B2 (en) 2006-02-02 2011-06-28 Head Technology Gmbh Racket for ball games
US8012043B2 (en) 2006-02-02 2011-09-06 Head Technology Gmbh Grip tape and grip for ball game racket
JP2014171526A (ja) * 2013-03-06 2014-09-22 Yonex Co Ltd ラケット

Also Published As

Publication number Publication date
GB9914090D0 (en) 1999-08-18
CN1277880A (zh) 2000-12-27
GB2351027A (en) 2000-12-20
JP2001009067A (ja) 2001-01-16
GB0014707D0 (en) 2000-08-09
EP1060767A3 (fr) 2003-04-23

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