EP0374177A1 - Dispositif utilise avec des raquettes - Google Patents

Dispositif utilise avec des raquettes

Info

Publication number
EP0374177A1
EP0374177A1 EP19880907868 EP88907868A EP0374177A1 EP 0374177 A1 EP0374177 A1 EP 0374177A1 EP 19880907868 EP19880907868 EP 19880907868 EP 88907868 A EP88907868 A EP 88907868A EP 0374177 A1 EP0374177 A1 EP 0374177A1
Authority
EP
European Patent Office
Prior art keywords
strings
units
along
string
extends
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Withdrawn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
EP19880907868
Other languages
German (de)
English (en)
Inventor
Bengt Pettersson
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.)
TOOLING PROMOTION AB
Original Assignee
TOOLING PROMOTION AB
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 TOOLING PROMOTION AB filed Critical TOOLING PROMOTION AB
Publication of EP0374177A1 publication Critical patent/EP0374177A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/10—Reinforcements for stringing

Definitions

  • the present invention relates to a device of rackets, which comprise a frame in which frame a huge number of each other crossing strings are arranged under tension so as to form a surface of impact.
  • plastic shims in the crossing areas of the strings, but these are separate elements which are made of plastic material which is slippery and relatively hard, which elements reduce the wear to a certain extent but do not prevent the movement of the crossing areas.
  • means in the shape of one or several longitudinal units of elastic, extensible material are arranged to extend along certain strings, preferably so, that they form a frame in the outer edge of said impact surface, said means being wound around the strings, crossing the string, along which said means extend respectively, said means further being arranged to be fixed at the ends of their extension along the string or strings in question.
  • the device in accordance with the invention enables a good fixation of the ' strings ' and a fitting of the device can be performed without the necessity of restringing the racket.
  • Fig. 1 shows a partly cut- a-way view of a tennis racket which is provided with the device according to the invention in a first mode of example
  • Fig. 2 shows an enlarged part-view of the mode of example according to Fig. 1
  • Fig. 3 shows a part-view of a tennis racket which is provided with a device according to the invention in a second mode of example
  • Fig. 4 is a cut-a ⁇ way-view of the cut along IV-IV of Fig. 1.
  • Fig. 1 and 2 comprises four tube-like units 1, 2, 3, 4 which are intended to extend along certain parts of the
  • the shaft comprises a longish unit which is rigidly attacked to the head and protru ⁇ des in the main plane of the racket head, i.e. the main plane in which the frame 8 and the strings 5, 6 protrude.
  • the strings are connected to the frame 8 in a conventional manner and are either separate strings for each longitudinal or transversal extension or by continuous strings, which are threaded through holes in the frame.
  • the tube-like units 1-4 comprise four elements, of which two tube ⁇ like units 1, 2 are arranged along the outermost longitudinal strings 5, whereas the two other tube-like units 3, 4 are arranged along the .outermost, transversal strings 6.
  • the expression longitudinal strings are intended to cover the strings who extend in the longitudinal direction of the racket i.e. along the length of the oval frame, whereas the transver ⁇ sal strings extend in the transversal direction of the racket i.e. across the frame.
  • the longitudinal strings 5 extends generally parallel to the shaft.
  • the tube-like units are not threaded upon any string but follows a string.
  • the units 1 and 2 follow the outermost longitudinal strings 5 and the- units 3 and 4 follow the outermost transversal strings, in each case on the outer _ side of the strings.
  • the tube-like units are fixed by means of being wound around those strings which cross the string that said tube-like unit follows. When it concerns the unit 2, does this consequently follow one of the two outermost longitudinal strings 5 and is thereby wound around each of the crossing transversal strings 6, which cross this string. How the winding can be performed is shown in Fig. 4.
  • the tube-like units are wound in such a manner that the extension between strings around which it is wound, is such that if they leave a string on one side therefore does the unit extend to the other string on this string's other side, around the latter and consequently away from this latter on the very same side as it arrived on, but then angled over to the opposite side of the next string and so on in a zig ⁇ zag pattern.
  • the tube-like unit in one gap extends close to, preferably in contact with the string which the unit extends along, and after being wound around a crossing string in an helical manner the tube-like unit extends in the following gap distanced from the string along which it extends.
  • This distan ⁇ ce is dependent on how much space the unit occupies in the transversal directon when it is wound around a string. At the following string it is wound in such a manner that it in the following gap again extends in contact , with the string along which it extends, etc, etc.
  • Fig. 4 The pattern of winding in a transversal view, in relation to the surface of impact, with tube-like element having angled parts is shown in Fig. 4, whereas the pattern comprising parallel but in a zig-zag manner displaced parts, in relation to the surface of impact, is best shown in Fig. 2 and 3.
  • the tube-like units are produced in a flexible, resilient preferably elastic material. This enables the units to follow the small elastic movement of the strings in a direction perpendicular to the impact surface, which movements occur at the moments of impact. Accordingly, a certain small amount of prolongation of the tubes occur at these moments in the longitudinal direction and as a consequence of the elastic properties they return to their original positions and do therefore reestablish each strings correct position in the main plane of the racket, which considerably reduces the possibility of permanent transversal displacement of the strings and therefore also of the crossing areas.
  • a certain small amount of the crossing areas is of course allowed in order to provide for good playing properties of the racket, which properties will be even improved since the transversal movability of the strings has been limited.
  • the power of a stroke will be more efficiently transformed to the ball when using top spin and slized strokes since the movability of the strings is reduced, which provides for an improved spin effect and an increased power of the ball.
  • the tube-like units have a vibration damping effect which accordingly implies the solu ⁇ tion of a huge problem of modern tennis rackets made of metal and composite materials where otherwise there is an especially big need for special vibration damping elements. Due to the damping, injuries of the arm of the player are preverted for to a major extent.
  • Suitable material for the tube-like units would be, as a matter of example, a relatively hard rubber material or a plastic material. It has proved to be especially preferable to use tubes made of polyurethane.
  • This material has an inner friction which is relatively high and by the time of prolongation, due to the transversal forces agianst the crossing strings, the material will reestablish its original position, after the prolongation, so that the strings will be returned to their correct position, however, not in a jerk ⁇ like manner but by means " of the inert friction in a somewhat timeextended action.
  • the vibrations of the strings are cushioned and as a consequence also in the racket, which is of major importance of physiological aspects.
  • tube-like units are not used to contain anything. That suc units are chosen instead depends on the fact that they transform into a flattened form when they are wound around the crossing strings. Hereby a good connection to these are achieved, so that they can support the adjacent string, along which said unit (or in accordance with a mode of example showed in Fig. 3, a part of the unit) extends along. Threads are characterised by being easily moved in a transverse direction by means of rolling and thereby the problem would arise that such a unit would move away from string, along which it should extend, and consequently the aimed effect of securing and vibration damping would therefore be hazardous.
  • a ribbon on the other hand is more difficult to work with during the fitting, since the ribbon is easily unintentionally twisted, which can be unfavourable.
  • the tube ⁇ like unit does not comprise any sepcific side and adopts its form to a ribbon once it is wound around a crossing string. Furthermore, it has turned out that the tube ⁇ like unit, once it is flattened receives a certain skin friction, which also is effected for damping of vibrations in conjunction with said inert friction of the material.
  • the tube-like units are tightly wound around the string and that they are stretched during the fitting with an adapted force. This can be achieved by produ ⁇ cing the units with a length which is adapated to the racket, so that if the unit is not sufficiently stretched it will not fit.
  • the units can be made with oversized comprising some kind of marking to mark the correct stretch, i.e. the markings should be leveled with the outermost crosing strings.
  • the strings are secured against the tube-like units by means of friction locking, where the surfaces of the tube-like units have been treated in order to achieve this.
  • Form locking is judged to provide for lower wear in case the friction is not so high that the crossing areas adjacent to the tube-like units is not moved.
  • the movement of the crossing areas adjacent the tube ⁇ like units, which occur is allowed due to the deformation of the tube-like units and the flexibility of their length, i.e. so that these follow the movements of the strings in question, extension and elastic contraction respectively, which implies that the distance between the crossing areas varies to some extent at the moment of impact.
  • the device is applied to other rackets than tennis rackets, i.e. squash rackets.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Golf Clubs (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

Le dispositif est destiné à être utilisé avec des raquettes comportant un cadre (8) qui comprend un grand nombre de cordes entrecroisées (5, 6), qui sont placées sous tension de façon à former une surface d'impact. Un organe, ayant la forme d'unités allongées (1, 4) en matériau plastique extensible est conçu de façon à s'étendre le long de certaines cordes (5, 6), créant ainsi un cadre dans la région extérieure de la surface d'impact. Cet organe est enroulé autour des cordes (5, 6) qui croisent la corde (6, 5) le long de laquelle il s'étend et il est conçu pour être fixé à ses parties terminales d'extension le long de la corde ou des cordes en question.
EP19880907868 1987-08-31 1988-08-29 Dispositif utilise avec des raquettes Withdrawn EP0374177A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8703389A SE461193B (sv) 1987-08-31 1987-08-31 Anordning vid racketar
SE8703389 1987-08-31

Publications (1)

Publication Number Publication Date
EP0374177A1 true EP0374177A1 (fr) 1990-06-27

Family

ID=20369448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880907868 Withdrawn EP0374177A1 (fr) 1987-08-31 1988-08-29 Dispositif utilise avec des raquettes

Country Status (3)

Country Link
EP (1) EP0374177A1 (fr)
SE (1) SE461193B (fr)
WO (1) WO1989001809A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024046993A1 (fr) 2022-08-29 2024-03-07 Chr. Hansen A/S Procédé de production d'un oligosaccharide de lait humain purifié dérivé d'un procédé de fermentation microbienne

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8902213U1 (de) * 1988-11-09 1989-04-06 Flamm, Klaus, 4030 Ratingen Bespannung für einen Schläger für Tennis, Federball o.dgl.
US4911445A (en) * 1989-01-27 1990-03-27 Ferrari Importing Company Vibration dampening device for a sports racket having a strung striking surface
US5169146A (en) * 1989-03-08 1992-12-08 Soong Tsai C Damping device for sports rackets
US5158286A (en) * 1989-03-08 1992-10-27 Soong Tsai C Damping device for sports rackets
US5211397A (en) * 1990-06-11 1993-05-18 Prince Manufacturing, Inc. String vibration dampener for a tennis racquet
US5149090A (en) * 1991-12-30 1992-09-22 Chen Sam H Vibration damping device for sports racquet

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1173712A (en) * 1916-02-29 Harry D Du Bois Tennis-racket.
US854024A (en) * 1906-10-30 1907-05-21 Horace S Brown Racket for tennis, &c.
US971773A (en) * 1909-10-05 1910-10-04 Curt B Mueller Tennis-racket.
GB191125019A (en) * 1911-11-10 1912-08-08 Oswald Edward Lewis An Improved Method of Stringing Lawn Tennis Racquets and the like.
FR580222A (fr) * 1924-02-12 1924-11-03 Mode de cordage de raquettes de tennis
GB300700A (en) * 1927-08-19 1928-11-19 Nellie Elizabeth Lovejoy Improvements in lawn tennis and like rackets
US4013289A (en) * 1975-06-30 1977-03-22 Bernard Kaminstein Tennis racket
US4190249A (en) * 1976-07-31 1980-02-26 Werner Fischer Tennis racket and method of making same
DE3324142A1 (de) * 1983-07-05 1985-01-24 Puma-Sportschuhfabriken Rudolf Dassler Kg, 8522 Herzogenaurach Ballschlaeger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8901809A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024046993A1 (fr) 2022-08-29 2024-03-07 Chr. Hansen A/S Procédé de production d'un oligosaccharide de lait humain purifié dérivé d'un procédé de fermentation microbienne

Also Published As

Publication number Publication date
SE461193B (sv) 1990-01-22
SE8703389D0 (sv) 1987-08-31
WO1989001809A1 (fr) 1989-03-09
SE8703389L (sv) 1989-03-01

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