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EP0310169B2 - Raquettes pour jeux de balles, en particulier raquettes de tennis - Google Patents
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EP0310169B2 - Raquettes pour jeux de balles, en particulier raquettes de tennis - Google Patents

Raquettes pour jeux de balles, en particulier raquettes de tennis Download PDF

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Publication number
EP0310169B2
EP0310169B2 EP88202025A EP88202025A EP0310169B2 EP 0310169 B2 EP0310169 B2 EP 0310169B2 EP 88202025 A EP88202025 A EP 88202025A EP 88202025 A EP88202025 A EP 88202025A EP 0310169 B2 EP0310169 B2 EP 0310169B2
Authority
EP
European Patent Office
Prior art keywords
racket
profile bar
profile
frame
cross
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
EP88202025A
Other languages
German (de)
English (en)
Other versions
EP0310169A2 (fr
EP0310169B1 (fr
EP0310169A3 (en
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.)
Individual
Original Assignee
Individual
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25825035&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0310169(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19843434956 external-priority patent/DE3434956A1/de
Application filed by Individual filed Critical Individual
Priority to AT88202025T priority Critical patent/ATE63226T1/de
Publication of EP0310169A2 publication Critical patent/EP0310169A2/fr
Publication of EP0310169A3 publication Critical patent/EP0310169A3/de
Application granted granted Critical
Publication of EP0310169B1 publication Critical patent/EP0310169B1/fr
Publication of EP0310169B2 publication Critical patent/EP0310169B2/fr
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
    • 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
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B2049/0211—Frames with variable thickness of the head in a direction perpendicular to the string plane

Definitions

  • the invention relates to a racket for ball games, in particular a tennis racket, with covering provided in a tensioning frame made of a profile bar in one plane, a heart zone adjoining the tensioning frame with flanking profile bar sections of the tensioning frame and a frame part connecting these profile bar sections, the profile bar sections with the frame part open heart boundaries, as well as with an end handle in the longitudinal axis of the racket, in particular in the axis of symmetry.
  • a tennis racket with a plate-like frame part can be found in DE-A-30 18 354, a frame bridge between profile sections shows DE-A-29 08 872.
  • the thickness of the uncovered handle of such tennis rackets measures between 23 and 32 mm, and the height of the Tensioning frame - seen in the direction of impact, i.e. at right angles to the covering - is below the handle thickness.
  • US-A-15 39 019 describes the development of a tennis racket whose center of vibration lies in the center of the stringing surface. Its handle continues up to the racket oval in an "intermediate portion", whose - to reduce the air resistance - the oval cross-section near the racket frame is knotted higher than its cross-section.
  • the club head is heavier at the head end due to a larger cross-section and supplemented by an additional weight in the form of a metal strip.
  • US-A-4 176 841 discusses the disadvantages of a racket by deflecting its frame in the direction of the stroke, and then the object is to design a mass-produced metal tennis racket so that low elasticity strings can be used without additional spring loading .
  • a racket is shown with the profile end surrounded by the handle and given as a typical profile width, which always remains constant over the profile length, with 22.5 mm.
  • the wall thickness for a hollow profile made of at least 95%, preferably 100%, titanium alloy is given as 0.6 to 0.8 mm. Since the constant profile width can be 25 to 40 times - in particular 30 times - and the profile thickness 5 to 20 times, in particular 10 times, larger than that wall thickness, comparatively high values for the profile height result. These height values, however, at the same time cause a significant weight gain in the case of the racket described, which makes it unplayable at higher profile heights - no reason for a person skilled in the art to take such paths.
  • the inventor has set himself the goal of significantly reducing the described deviations in a racket of the type mentioned at the beginning and of improving its impact behavior overall. Above all, the profile stiffness should be increased.
  • the greatest cross-sectional height of the profile bar running transversely to the plane of the covering on both sides of the longitudinal axis of the racket in the area of the heart zone is greater than the thickness of the handle, the cross-sectional height of the profile bar decreasing approximately from the heart zone of the racket to the club head.
  • the usual thickness of the handle without casing - that is, without grip leather, foam rubber covering or the like.
  • Components not belonging to the structural racket profile - and without taking into account the grip cap is between about 23 and 32 mm.
  • Its racket axis forms a line of symmetry, and the height of the cross section of the tenter frame is - without prejudice to the frame design outside the specified area in this - greater than that thickness of the handle. The latter is determined by the human hand and therefore remains without influence on the club design.
  • the above stipulation of the ratio of handle thickness to the height of a cross section also applies to a profile rod from which the stenter frame is made.
  • the height of the cross-section of the profile bar and / or stenter has proven to be a measure of the thickness of the handle up to about 45 mm.
  • the racket tapers from the greatest cross-sectional height of its profile bar in the area of the heart zone both to the handle and to the racket head, that is to say in both directions of the longitudinal axis.
  • the greatest height of the profiled bar in the specified area should be in the vicinity of the connection point between the profiled bar and the frame web, advantageously on both sides of this frame web. It is also advantageous if this greatest height is constant in an area running on both sides of the heart zone.
  • the greatest height may decrease steadily while creating a straight longitudinal contour of the profile, but it is also possible to produce the contour curved or curved.
  • the height of the cross-section or profile of the racket or stenter which is perpendicular to the covering, increases abruptly or gradually compared to the grip thickness and can also decrease again from the point of greatest extent to the racket head.
  • the racket according to the invention - which corresponds to known rackets insofar as its tenter frame or a profile rod resulting from this has a cross-sectional width between 8 and 16 mm measured in the plane of the covering - has an moment of inertia which is 4 to 16 times higher than the moment of inertia a tennis racket according to the prior art, the cross-sectional height of which is equal to or less than the thickness of its handle.
  • the longitudinal axis of the racket is also an axis of symmetry, ie the cross-section of the clamping frame described is on the other side of the axis of symmetry a corresponding cross-section.
  • the covering determines a plane of symmetry.
  • a tennis racket 10 of known type shown in FIGS. 1 to 3 has an oval clamping frame 12 made of a correspondingly curved profile bar 13, which ends on both sides of the racket longitudinal axis M in - defining a plate-shaped heart 14 - profile arms 15.
  • the latter are fixed in a handle 16 with a thickness i of 26 to 32 mm; the thickness i is measured on handles 16 without wrapping leather and without considering a handle cap 17.
  • Tensioning frame 12 and heart 14 surround a stringing surface Q made of cross strings 18 and longitudinal strings 19 crossing them.
  • the preferred point of impact for a tennis ball (not shown) is designated by S in FIG. 1.
  • the tensioning frame 12 or its profiled bar 13 is rectangular in cross section, the side walls 20 of which run, for example, at a distance a of 7 mm and the transverse walls 21 of which run at a distance b of 17 mm.
  • the outer width m is 11 mm and the outer height n is 21 mm. The latter is otherwise far lower than the thickness i of the handle 16.
  • the natural frequency f o of the tennis racket 10 clamped in accordance with the diagram according to FIG. 5 can be measured by suddenly removing a force P acting on the longitudinal axis M of the racket.
  • f O 3000 1 (HZ), where 1 is the oscillation length in mm read from the writing tape.
  • FIG. 4 shows a longitudinal vibration curve for a conventional tennis racket 10 according to FIGS. 1 to 3.
  • a ball touches the net of covering Q and forces the tenter 12 to follow the ball frequency. This movement seeks to counteract dynamic inertial forces of the tenter frame 12.
  • Arrived at point B the ball reverses its direction and leaves the string Q following the ball approximately at point C.
  • the design of a tennis racket 30 according to FIGS. 6 to 8 has a resonance frequency, which remedies the described defect;
  • the cross section of the profile rod 33 contains the following dimensions according to FIG. 8: inner width a 1 8 mm, outer width m 1 10 mm, inner height b 1 32.2 mm, outer height n 1 37 mm as the result of a calculation which confirms the agreement of the natural frequency of this tennis racket 30 and the "ball resonance", that is to say the agreement of the excitation frequency with the natural frequency.
  • the deflection d is a function of 1 J .
  • FIG. 7 shows a frame shape that takes these findings into account, in which an area E with a projecting profile height n 1 extends on both sides of a frame web 34. From the area E, the profile height n o to the head 40 on the one hand and to the handle attachment 41 decreases continuously.
  • the frame web 34 shown in section in FIG. 7 replaces the previously described heart 14 and has a lower average profile height h than the profile bar 33.
  • the vibration behavior of the tennis racket 30 according to the invention in the longitudinal direction can be seen in FIG. 9.
  • the natural frequency of the racket now matches the excitation frequency of the ball.
  • the tennis racket 30 has reached point C or in the immediate vicinity thereof, and the ball receives, in addition to an additional acceleration, the tension frame 32 of the tennis racket 30 an exact trajectory which is no longer falsified by the dimension Z of the deflection, as can be seen in FIG. 4.
  • a torsional vibration occurs about the longitudinal axis M. This torsional vibration is superimposed on the longitudinal vibration.
  • the entire tennis racket 30 only vibrates sinusoidally at a frequency when touching the ball and also compensates for torsional deflection by timely swinging back.
  • the handles 16 of the tennis racket 30 (FIGS. 6 to 8) and the embodiments 30 a and 30 b shown in FIGS. 10, 11 are of conventional thickness i, which - as said - measures 23 to 32 mm compared to this Thickness i have the adjoining profile bars - better designated as frame profiles 33 for the sake of their changing heights - in all cases a longer outer height n 1 .
  • the max. Height n 1 of frame profile 33 a ends approximately at heart zone H and decreases as height n o to racket head 40.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Golf Clubs (AREA)
  • Fishing Rods (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Moulding By Coating Moulds (AREA)
  • Laminated Bodies (AREA)

Claims (10)

  1. Raquette (30) pour jeu de balle, en particulier raquette de tennis, comprenant un cadre tendeur (32) formé d'une barre profilée (33) pour un fond prévu dans un plan, une zone formant coeur (H) adjacente au cadre tendeur (32), bordée par des tronçons de barre profilée du cadre tendeur (32), un élément de cadre (34) reliant ces tronçons de barre profilée et les tronçons de barre profilée, avec l'élément de cadre délimitant un coeur ouvert, ainsi qu'un manche (16) situé à une extrèmitè selon l'axe longitudinal de la raquette (M), en particular dans le plan de symétrie, caractérisé en ce que, dans la région de la zone format coeur, la hauteur maximale (n1), s'étendant transversalement par rapport au plan du fond (Q), de la section droite de la barre profilée (33, 33a à 33c) est supérieure à l'épaisseur (i) du manche (16), et que la hauteur (no) de la section droite de la barre profilée décroit à peu près depuis la zone formant coeur de la raquette jusqu'a la tête de la raquette (40).
  2. Raquette conforme à la revendication 1 comprenant une entretoise de cadre (34) comme élément de cadre reliant les tronçons profilés, caractérisée en ce que la hauteur (h) de la section de l'entretoise de cadre (34) est inférieure à la hauteur maximale (n1) de la barre profilée (33, 33a, 33b) dans la région de la zone formant coeur (H).
  3. Raquette conforme à l'une des revendications 1 ou 2, caractérisée en ce que la hauteur maximale (n1) de la section droite de la barre profilée (33) est prévue dans la région de la zone formant coeur (H) aux deux extrémités de l'entretoise de cadre (34).
  4. Raquette conforme à l'une des revendications 1 à 3, caractérisée en ce que la hauteur maximale (n1) de la section droite de la barre profilée (30, 30a, 30b) a la même valeur dans une région (E) de la zone formant coeur (H), des deux côtés de l'axe longitudinal de la raquette (M).
  5. Raquette conforme à l'une des revendications 1 à 4, caractérisée en ce que la barre profilée (33, 33a) se rétrécit aussi bien vers le manche (16) que vers la tête (40) de la raquette.
  6. Raquette conforme à l'une des revendications 1 à 5, caractériseée en ce que la diminution de la hauteur (n0) de la section droite est régulière ou en ce que sa hauteur (n) diminue en formant un contour courbe.
  7. Raquette conforme à l'une des revendications 1 à 6, caractérisée en ce que la barre profilée (33, 33a, 33b) est creuse.
  8. Raquette conforme à l'une des revendications 1 à 7, caractérisée en ce que la fréquence de résonance du premier ordre de la raquette cordée (30) correspond approximativement à la fréquence, calculée sur la base de la demi-oscillation de la durée du contact balle/fond (Q) et atteint sur la raquette (30) immobilisée par le manche (16) pour des jeux où la balle se trouve au contact du fond (Q) pendant une durée de 2 à 6 ms correspondant à une demi-oscillation, une valeur allant de 80 à 200 Hz, et en particulier de 100 à 140 Hz.
  9. Raquette conforme à la revendication 8, caractérisée en ce que la fréquence propre de la raquette (30) concorde sensiblement avec la fréquence excitatrice de la balle.
  10. Raquette conforme à l'une des revendications 1 à 9, dont la barre profilée formant le cadre tendeur a une section droite ayant une largeur comprise entre 8 mm et 16 mm, caractérisée en ce que le moment d'inertie de la section droite du cadre tendeur (32) ou de la barre profilée (33) de la raquette (30) représente 4 à 16 fois le moment d'inertie d'une raquette (10) dont la section droite a une hauteur inférieure ou égale à l'épaisseur (i) du manche (16).
EP88202025A 1984-09-22 1985-09-17 Raquettes pour jeux de balles, en particulier raquettes de tennis Expired - Lifetime EP0310169B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88202025T ATE63226T1 (de) 1984-09-22 1985-09-17 Schlaeger fuer ballspiele, insbesondere tennisschlaeger.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19843434956 DE3434956A1 (de) 1984-09-22 1984-09-22 Schlaeger fuer spiele mit begrenzt elastischem ball
DE3434956 1984-09-22
EP85111713A EP0176021B1 (fr) 1984-09-22 1985-09-17 Raquette de tennis

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP85111713.5 Division 1985-09-17

Publications (4)

Publication Number Publication Date
EP0310169A2 EP0310169A2 (fr) 1989-04-05
EP0310169A3 EP0310169A3 (en) 1989-08-02
EP0310169B1 EP0310169B1 (fr) 1991-05-08
EP0310169B2 true EP0310169B2 (fr) 1996-08-07

Family

ID=25825035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88202025A Expired - Lifetime EP0310169B2 (fr) 1984-09-22 1985-09-17 Raquettes pour jeux de balles, en particulier raquettes de tennis

Country Status (2)

Country Link
EP (1) EP0310169B2 (fr)
AT (1) ATE63836T1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63270068A (ja) * 1987-04-28 1988-11-08 ヤマハ株式会社 ラケツトフレ−ム
JPH06236311A (ja) * 1993-02-10 1994-08-23 Matsushita Electric Ind Co Ltd 情報管理装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539019A (en) * 1924-02-07 1925-05-26 John P Nikonow Tennis racket
US3647211A (en) * 1970-06-08 1972-03-07 James H Doessel Plastic tennis racket having predetermined cross sections effecting flexibility
US4165071A (en) * 1976-01-05 1979-08-21 Frolow Jack L Tennis racket

Also Published As

Publication number Publication date
EP0310169A2 (fr) 1989-04-05
EP0310169B1 (fr) 1991-05-08
ATE63836T1 (de) 1991-06-15
EP0310169A3 (en) 1989-08-02

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