EP0468263B1 - Schläger für Ballspiele, insbesondere Tennisschläger - Google Patents

Schläger für Ballspiele, insbesondere Tennisschläger Download PDF

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Publication number
EP0468263B1
EP0468263B1 EP91111309A EP91111309A EP0468263B1 EP 0468263 B1 EP0468263 B1 EP 0468263B1 EP 91111309 A EP91111309 A EP 91111309A EP 91111309 A EP91111309 A EP 91111309A EP 0468263 B1 EP0468263 B1 EP 0468263B1
Authority
EP
European Patent Office
Prior art keywords
racket
handle
shaft
axis
thickness
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
EP91111309A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0468263A1 (de
Inventor
Siegfried Kuebler
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.)
Wilson Sporting Goods Co
Original Assignee
Kuebler Siegfried
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 Kuebler Siegfried filed Critical Kuebler Siegfried
Publication of EP0468263A1 publication Critical patent/EP0468263A1/de
Application granted granted Critical
Publication of EP0468263B1 publication Critical patent/EP0468263B1/de
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
    • 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
    • A63B49/08—Frames with special construction of the handle
    • 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
    • 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
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/002—Resonance frequency related characteristics
    • 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

  • the invention relates to a racket for ball games, in particular a tennis racket, according to the preamble of claim 1.
  • Tennis rackets can be found, for example, in DE-A-30 18 354. Clamped in the area of the handle, a natural frequency of 25 to max. 50 Hz detected; unstrung tennis rackets generally show slightly higher values. The frequency of the overall racket / stringing system has a significant influence on the hand that is playing with it and thus also on the creation of the so-called tennis arm.
  • FR-A 2 547 506 discloses a generic tennis racket.
  • the handle is completely separated from the racket neck, ie the actual striking area.
  • the racket neck is formed by two end parts of the strip-like profile rod that are parallel and at a distance, between which two other parallel strips of material are inserted, which protrude from the handle. These two pairs of strips are connected by two bolts which carry washers; the latter are located between the inner pair of strips of the handle and the outer pair of strips of the racket frame.
  • each of these bolts - running parallel to the covering and transverse to the longitudinal axis of the racket - can be described as axis-like, but both bolts together are only connecting means and not articulation points.
  • the handle and the racket neck are connected by a grip bolt which is axially clamped in the racket grip and is separated from that striking area by two rubber rings; the handle bolt is supported in the two rubber rings, one of which is spaced apart Separating end of the bat neck is provided, whereas the other is in the bat heart. Between these two bearing areas, the handle bolt passes through the racket neck in an axial channel.
  • the racket has a hinge point in the handle in that there is at least one groove-like indentation on both sides of the racket's longitudinal axis, the lowest point of which ends at a web part of the racket, the web part the position of which - in the prior art laid by a fixed bolt - - Axis determines which forms an articulated axis here.
  • the racket has a hinge point in the handle in that there is at least one groove-like indentation on both sides of the racket's longitudinal axis, the lowest point of which ends at a web part of the racket, the web part the position of which - in the prior art laid by a fixed bolt - - Axis determines which forms an articulated axis here.
  • the pivot point of the racket when hitting a ball is referred to in technical terms as "pivot pivot point". No forces occur at this point, but there is torque around it. From this point up to the head of the racket, the racket is influenced by forces in the direction of the incoming ball in the event of a ball impact. Forces, however, contribute from the pivot point to the forehead opposite direction. Therefore, a racket tries to tip out of the hand on a forehand stroke, whereas it hits the palm of the hand on a backhand stroke. This may be the reason why players with a so-called tennis arm can hit the forehand relatively painlessly, but that more pain occurs on a backhand.
  • the preferred location for the said joint location or the web part is in a range of 60 to 200 mm from the front of the handle. This is also the area in which that pivot lies.
  • the width, measured in the longitudinal axis of the racket, of the groove-like indentations arranged on that web part, preferably on both sides, can be up to 100 mm, but will generally be considerably shorter.
  • the depth of the web part corresponds approximately to the depth of the recess or groove, which requires a division of the shaft cross section into three sections of approximately the same width.
  • the two grooves or indentations are preferably filled by a molding compound of low flexural rigidity, in particular when the two grooves or indentations are provided in the grip area and must be covered by the grip leather.
  • the object according to the invention is also achieved by a racket with a plurality of parallel axes of adjacent articulation points directed transversely to the longitudinal axis of the racket.
  • the deflection in the elastic area of the racket which is firmly clamped to the first joint point on the handle under the action of a force that acts headwards in 400 mm sand from the joint axis, should be 1.2 to 9 times as large as the deflection of a jointless - otherwise but appropriately designed - racket with firm clamping on the handle up to the hinge axis.
  • the joint point (s) advantageously reduces the frequency of a racket firmly clamped to the first joint on the handle by ⁇ 1.2 up to ⁇ 9 compared to an identical racket without a joint.
  • the intermediate layer - seen in cross section - can also consist of several strips or strands which leave hollow spaces or gaps between them.
  • a round strand is provided which keeps the two associated shaft rods at a distance and the remaining sections of the shaft gap free.
  • the elastic mass rests on both sides of the surfaces delimiting the shaft gap and that the shaft rods can be moved - at least partially - laterally relative to one another in the direction of impact.
  • the handle is separated in the case of a symmetrical racket construction parallel to the striking direction or perpendicular to the striking surface and preferably along the longitudinal axis of the racket. If the dividing shaft gap lies outside the center line, is curved, oblique or jagged, the achievable damping results are not quite as good, but still acceptable. According to a further feature of the invention, the generally rectangular cross-section of the shaft gap runs linearly in the plane or surface, but the cross-section can also be wave-shaped or jagged.
  • the elastic connecting elements of properly separated shaft or handle bars can - e.g. B. from a silicone rubber layer - be continuous. However, it is also conceivable to arrange them in punctiform or strip-like fashion, for example at the cutting edge or the gap ends. These connecting elements can be made from pieces of tubing, round rubber cords or otherwise resilient. A partial opening, for example slots, which can also be unfilled, is also conceivable; a firm connection could only remain at the end of the handle and the slot above could contain a damping material.
  • the surface described is curved in cross section, and several surfaces can be assigned to one another.
  • linear or curved flat bars made of elastic mass are used which, as described, can completely or only partially fill the shaft gap.
  • a tennis racket 10 shown by way of example in FIGS. 1 to 4 has an oval racket head or clamping frame 14 formed by a correspondingly curved profile bar 12.
  • the profile rod 12 of the club head 14 ends on both sides of the longitudinal axis M in - profile arms 16 which laterally delimit an open heart zone H - which are connected by a frame web 18 and merge into a club neck 19.
  • the racket head 14 and the frame web 18 determine a stringing surface Q from cross strings 24 and these cross-stringing longitudinal strings 25.
  • the preferred point of impact A for a tennis ball lies in FIG. 1 approximately at the point of intersection of the racket longitudinal axis M with the section line III-III and in FIG in a line K.
  • the club head 14 or its hollow profile rod 12 is i.w. of elongated oval cross-section, the side walls 26 of which run at an inner distance a of, for example, 8 mm (outer width m about 10 mm) and merge into curved sections 27 with an inner profile height b of 20 mm and an outer profile height n of about 25 mm here.
  • This profile rod 12 is formed from a tubular blank 30, in which 27 longitudinal fiber strands 31 are arranged in the arc sections. The ends of the blank 30 are brought together on the bat neck 19 so that two chambers 29 are formed in this and in the handle 20. 4, the two ends of the blank 30 form the octagonal cross section of the handle 20.
  • the handle 20 is made of two parts 32, 32a, which are connected at a distance e by an elastic intermediate piece 34.
  • the latter comprises two transverse plates 36 made of metal or another suitable material as well as a rubber block 38 vulcanized onto them.
  • the distance of this hinge axis B from the end 15 of the club head 14 is denoted by g.
  • the joint shown in FIGS. 6, 7 is defined by grooves 40 of the greatest width z formed on both sides in the handle 20 - tapering towards the grip axis M -.
  • the grooves 40 are filled, for example, by plastic blocks 42 with low bending stiffness.
  • the depth i of the grooves 40 is somewhat shorter in FIG. 7 than the thickness c of a stopped intermediate web 44 of the handle 20; the surfaces of the intermediate web 44 each form the deepest groove 41.
  • longitudinal strands 31 of the blank 30 are wrapped around the grooves 40, that is to say not interrupted at the joint point.
  • the deflection is due to an acting force due to the lower moment of inertia in the cross-section of the bar per unit length about 4.3 times as high as the deflection with a full handle cross-section, if the modulus of elasticity is assumed to be unchanged; otherwise the deflection is inversely proportional to the product of the moment of inertia x modulus of elasticity.
  • the web thickness c is only a third of the thickness h of the handle 20, the corresponding value is 12.5 and finally becomes 20 times as high as a quarter.
  • the articulation point 34 must act fairly elastic in order to bring about small frequency changes. This will be explained using an example for the embodiment according to FIGS.
  • the thickness c of the web 44 should be half the handle thickness h of the tennis racket 10, the width z is 20 mm.
  • the distance t from the handle end 23 is set at 120 mm.
  • the ball hits the covering Q at point A, which in the selected example is 400 mm away from the articulation axis B.
  • the moment of inertia for the full grip cross-section is unchanged for all racket cross-sections - that is to say over the entire racket length - no torsional moments occur and the modulus of elasticity remains constant.
  • the calculation shows that the deflection of the tennis racket 10 with the described joint 34 under the acting ball force is 1.22 times as high as that of an identical racket without a joint.
  • the frequency of the tennis racket 10 would then vary with the reciprocal change from the root of the deflection. If the tennis racket 10 had a frequency of 80 Hz, the racket provided with this joint would have a frequency of 80 x 1 / 1.22 Hz, i.e. 72.5 Hz.
  • Another example should show how a larger frequency reduction is possible.
  • the web height c is chosen with a quarter of the handle thickness h.
  • the width z is 100 mm. Otherwise, the data of the first example apply.
  • the required deflection would be six times as large and the desired frequency root six times lower, i.e. instead of 80 Hz only 33 Hz.
  • This frequency relates to a tennis racket 10 firmly clamped to the first joint on the handle 20.
  • the racket neck 19 and the subsequent shaft of the handle 20 are symmetrically divided in the direction of the longitudinal axis M of the racket, ie each of the profile arms 16 continues with its own shaft rod 46 a in the handle 20, both shaft rods 46 a together determine the outer contour of a handle shaft 46 and delimit a shaft gap 48 between them, which receives an elastic intermediate layer 50 in FIG. 9 and determines a plane E which crosses the covering surface Q - approximately perpendicular in FIGS. 11 to 14.
  • the shaft rods 46 a - apart from the articulation point 40/44 - are symmetrical full profiles with an interposed strip of elastic mass as a filling intermediate layer 50 in the shaft gap 48, which is linear in cross section here, whereas FIG. 12 cross-sectional differently designed shaft rods 46 b , 46 c with between them - at different distances f, g to the side contours 52 - approximately undulating shaft gap 48 c , which is completely filled by the elastic intermediate layer 50 c .
  • FIG. 13 illustrates a handle 20 with symmetrically in the plane E in shaft rods 46 d divided hollow profile with elastic round strand 50 d .
  • the embodiment of FIG. 14 corresponds to that of FIG. 11 with the difference that the shaft rods 46 e are hollow profiles, each with an all-around limited profile chamber 47.
  • FIG. 15 shows a three-part handle shaft 46 f made up of two flank bars 54 and a core or central bar 55, between which intermediate layers 50 k curved in the shape of a circle can be seen.
  • two curved surfaces F can be seen here.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Laminated Bodies (AREA)
  • Golf Clubs (AREA)
  • Vibration Dampers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Prostheses (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Vibration Prevention Devices (AREA)
EP91111309A 1990-07-27 1991-07-08 Schläger für Ballspiele, insbesondere Tennisschläger Expired - Lifetime EP0468263B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4023906 1990-07-27
DE4023906 1990-07-27
DE4106067A DE4106067A1 (de) 1990-07-27 1991-02-27 Schlaeger fuer ballspiele, insbesondere tennisschlaeger
DE4106067 1991-02-27

Publications (2)

Publication Number Publication Date
EP0468263A1 EP0468263A1 (de) 1992-01-29
EP0468263B1 true EP0468263B1 (de) 1995-05-24

Family

ID=25895417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91111309A Expired - Lifetime EP0468263B1 (de) 1990-07-27 1991-07-08 Schläger für Ballspiele, insbesondere Tennisschläger

Country Status (9)

Country Link
EP (1) EP0468263B1 (ja)
JP (1) JP3129772B2 (ja)
CN (1) CN1064414A (ja)
AT (1) ATE122907T1 (ja)
CA (1) CA2047076A1 (ja)
DE (2) DE4106067A1 (ja)
DK (1) DK0468263T3 (ja)
ES (1) ES2076423T3 (ja)
MY (1) MY107222A (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4200596A1 (de) * 1991-02-27 1993-02-25 Siegfried Kuebler Schlaeger fuer ballspiele, insbesondere tennisschlaeger
DE4410664C2 (de) * 1994-01-27 1996-10-17 Franz Voelkl Gmbh & Co Ski Ten Ballspielschläger
DE19825075A1 (de) * 1998-06-04 2000-02-10 Peter Weidenschlager Tennisschläger
DE10304797B4 (de) * 2003-02-05 2007-02-01 Völkl Tennis GmbH Ballspielschläger, insbesondere Tennisschläger
JP2013022361A (ja) 2011-07-25 2013-02-04 Dunlop Sports Co Ltd ラケットフレーム

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB458103A (en) * 1935-06-12 1936-12-14 William Henri Kerr Improvements in handles for rackets used in playing games
DE1684290U (de) * 1954-07-03 1954-09-30 Adolf Maedler Schlaeger fuer federballspiel.
US4082273A (en) * 1976-02-19 1978-04-04 The Ellzey Company Striking implements
FR2547506B1 (fr) * 1983-06-17 1986-04-04 Blondy Jacques Raquette de tennis
DE3704121A1 (de) * 1986-02-19 1987-08-20 Nippon Musical Instruments Mfg Schwingungsabsorber fuer ein rakett
GB8609578D0 (en) * 1986-04-18 1986-05-21 Dunlop Ltd Games racket
DE8622129U1 (ja) * 1986-08-21 1988-06-23 Lo, Kun-Nan, Tan Tzu, Taichung, Tw
DE3706554A1 (de) * 1987-02-28 1988-09-08 Anton Ing Grad Pfeifer Haltegriff fuer tennisschlaeger mit integriertem hydraulischen stossdaempfer

Also Published As

Publication number Publication date
CN1064414A (zh) 1992-09-16
JP3129772B2 (ja) 2001-01-31
CA2047076A1 (en) 1992-01-28
EP0468263A1 (de) 1992-01-29
DE4106067A1 (de) 1992-01-30
DK0468263T3 (da) 1995-10-16
ATE122907T1 (de) 1995-06-15
DE59105564D1 (de) 1995-06-29
ES2076423T3 (es) 1995-11-01
JPH04236973A (ja) 1992-08-25
MY107222A (en) 1995-10-31

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