WO1989001809A1 - Device of rackets - Google Patents
Device of rackets Download PDFInfo
- Publication number
- WO1989001809A1 WO1989001809A1 PCT/SE1988/000438 SE8800438W WO8901809A1 WO 1989001809 A1 WO1989001809 A1 WO 1989001809A1 SE 8800438 W SE8800438 W SE 8800438W WO 8901809 A1 WO8901809 A1 WO 8901809A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- strings
- string
- units
- along
- crossing
- Prior art date
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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8703389A SE461193B (sv) | 1987-08-31 | 1987-08-31 | Anordning vid racketar |
SE8703389-0 | 1987-08-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1989001809A1 true WO1989001809A1 (en) | 1989-03-09 |
Family
ID=20369448
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1988/000438 WO1989001809A1 (en) | 1987-08-31 | 1988-08-29 | Device of rackets |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0374177A1 (sv) |
SE (1) | SE461193B (sv) |
WO (1) | WO1989001809A1 (sv) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4911445A (en) * | 1989-01-27 | 1990-03-27 | Ferrari Importing Company | Vibration dampening device for a sports racket having a strung striking surface |
US5141227A (en) * | 1988-11-09 | 1992-08-25 | Klaus Flamm | Prefabricated stringing for a sports racket |
US5149090A (en) * | 1991-12-30 | 1992-09-22 | Chen Sam H | Vibration damping device for sports racquet |
US5158286A (en) * | 1989-03-08 | 1992-10-27 | Soong Tsai C | Damping device for sports rackets |
US5169146A (en) * | 1989-03-08 | 1992-12-08 | 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 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024046993A1 (en) | 2022-08-29 | 2024-03-07 | Chr. Hansen A/S | Process for the production of a purified human milk oligosaccharide derived from a microbial fermentation process |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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. |
US1173712A (en) * | 1916-02-29 | Harry D Du Bois | Tennis-racket. | |
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 |
US4575083A (en) * | 1983-07-05 | 1986-03-11 | Puma-KG | Racket with elastic vibration damping strip |
-
1987
- 1987-08-31 SE SE8703389A patent/SE461193B/sv not_active IP Right Cessation
-
1988
- 1988-08-29 WO PCT/SE1988/000438 patent/WO1989001809A1/en not_active Application Discontinuation
- 1988-08-29 EP EP19880907868 patent/EP0374177A1/en not_active Withdrawn
Patent Citations (9)
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 |
US4575083A (en) * | 1983-07-05 | 1986-03-11 | Puma-KG | Racket with elastic vibration damping strip |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5141227A (en) * | 1988-11-09 | 1992-08-25 | Klaus Flamm | Prefabricated stringing for a sports racket |
US4911445A (en) * | 1989-01-27 | 1990-03-27 | Ferrari Importing Company | Vibration dampening device for a sports racket having a strung striking surface |
US5158286A (en) * | 1989-03-08 | 1992-10-27 | Soong Tsai C | Damping device for sports rackets |
US5169146A (en) * | 1989-03-08 | 1992-12-08 | 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 |
Also Published As
Publication number | Publication date |
---|---|
SE461193B (sv) | 1990-01-22 |
SE8703389D0 (sv) | 1987-08-31 |
EP0374177A1 (en) | 1990-06-27 |
SE8703389L (sv) | 1989-03-01 |
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