EP2133125B1 - Tige pour crosse de sport - Google Patents

Tige pour crosse de sport Download PDF

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Publication number
EP2133125B1
EP2133125B1 EP08158250A EP08158250A EP2133125B1 EP 2133125 B1 EP2133125 B1 EP 2133125B1 EP 08158250 A EP08158250 A EP 08158250A EP 08158250 A EP08158250 A EP 08158250A EP 2133125 B1 EP2133125 B1 EP 2133125B1
Authority
EP
European Patent Office
Prior art keywords
shaft
indentations
mould
stick
indentation
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.)
Not-in-force
Application number
EP08158250A
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German (de)
English (en)
Other versions
EP2133125A1 (fr
Inventor
Mikael Sundgren
Johannes Quist
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.)
Renew Group Sweden AB
Original Assignee
Renew Group Sweden AB
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Filing date
Publication date
Application filed by Renew Group Sweden AB filed Critical Renew Group Sweden AB
Priority to AT08158250T priority Critical patent/ATE535287T1/de
Priority to EP08158250A priority patent/EP2133125B1/fr
Publication of EP2133125A1 publication Critical patent/EP2133125A1/fr
Application granted granted Critical
Publication of EP2133125B1 publication Critical patent/EP2133125B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A63B59/00—Bats, rackets, or the like, not covered by groups A63B49/00 - A63B57/00
    • A63B59/70—Bats, rackets, or the like, not covered by groups A63B49/00 - A63B57/00 with bent or angled lower parts for hitting a ball on the ground, on an ice-covered surface, or in the air, e.g. for hockey or hurling
    • 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
    • A63B60/006—Surfaces specially adapted for reducing air resistance
    • 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
    • A63B60/06—Handles
    • A63B60/10—Handles with means for indicating correct holding positions
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/22—Field hockey
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/24—Ice hockey
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/34—Polo
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2225/00—Miscellaneous features of sport apparatus, devices or equipment
    • A63B2225/01—Special aerodynamic features, e.g. airfoil shapes, wings or air passages
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B59/00—Bats, rackets, or the like, not covered by groups A63B49/00 - A63B57/00
    • A63B59/60—Bats, rackets, or the like, not covered by groups A63B49/00 - A63B57/00 of mallet type, e.g. for croquet or polo
    • 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

Definitions

  • the present invention relates to a shaft for a sport stick comprising a hollow tube.
  • the present invention further relates to a mould to form such a shaft as well as a method to form such a shaft.
  • a stick In many sports, like hockey, bandy or floor ball, a stick is used when playing.
  • the stick normally comprises a shaft and a blade attached at, or close to, one end of the shaft, and a ball or puck is propelled by the blade when using the stick.
  • Such sticks were made of wood but material development has lead to an increased use of plastics and composite materials. Using wood, the shafts are normally solid, while using plastic and composite materials it is easy to make a hollow structure for the shaft. Thereby, it is possible to keep the weight down without sacrificing the mechanical properties of the shaft, which mechanical properties may include strength and rigidity/flexibility.
  • EP 1 862 201 discloses a hockey stick having a single, hollow primary tube of composite material, wherein tubular ports extend through the hollow tube.
  • a port has a peripheral wall and its ends are bonded to the walls of the hollow tube. According to '201, this hockey stick system has improved aerodynamics, strength and appearance.
  • JP 09 299 526 A discloses shaft that can be used for a golf club, bat, ski stick, fishing rod or bicycle required to be moved at high speed in the air.
  • On the surface of the shaft plural recessed or projecting parts of a prescribed form are formed almost uniformly over the entire surface through any suitable technique such as embossing, casting or precutting.
  • CA-A1-2 069 730 discloses a device to increase swing speed of a swung sporting implement, such as a baseball bat or a hockey stick, by reducing base drag behind such implement, with drag being reduced by including in the surface of such implement a plurality of surface discontinuities in such a pattern as to change fluid flow behaviour across the surface of such sporting implement to a more favourable flow condition.
  • WO 94/00203 discloses a tennis racquet which uses a surface modification to increase the swing speed thereof.
  • the increase of swing speed of the racquet, as used in racquet sports such as tennis, squash, badminton or racquetball, is achieved by reducing the base drag behind the frame and strings of the racquet.
  • a shaft for a sport stick comprising an elongate hollow tube with an external surface wherein the external surface is provided with a plurality of indentations, such that the aerodynamics of the shaft is modified by the indentations as compared to a shaft with a smooth surface.
  • each one of the indentations has a wall thickness which as substantially the same as the wall thickness of a neighbouring portion of theshaft
  • indentation as used herein is used to denote indentations with a closed envelope surface. Such indentations have a peripheral wall over the whole bottom of the indentation. Tubular ports extending through the shaft are thus not comprised by the invention.
  • the indentations cover at least 10%, preferably at least 20% and most preferably at least 40% of the external surface of the shaft.
  • the shaft is constituted by an upper region, adapted to form a handle for the shaft, and a lower region, and the indentations are substantially concentrated to the lower region.
  • the indentations of this embodiment cover at least 20%, preferably at least 30% and most preferably at least 60% of the external surface of the lower region. With this distribution of indentations, a good grip is provided for a player using a stick comprising the shaft, while the positive aerodynamical effects are maintained.
  • At least a majority of the indentations have an opening angle ( ⁇ ) of less than 90°, preferably less than 75° and most preferably less than 60°.
  • the indentations could have any shape; round, elliptical, hexagonal, octagonal etc. Generally, preferably at least one of the indentations has a largest extension in a first direction along the hollow tube, wherein the indentation further has an extension in a second direction, the first and second directions being substantially perpendicular to each other, wherein a first measure in the first direction of the indentation is within the range of 1 - 10, preferably 1 - 5, more preferably 1 - 2, times a second measure in the second direction of the indentation.
  • the plurality of indentations comprises a first and a second set of indentations, the design of the indentations of the first set being different from the design of the indentations of the second set.
  • a transition from the external surface of the shaft to the indentation defines an opening area which is 0.5-300 mm 2 , preferably 1-100 mm 2 , most preferably 2-50 mm 2 .
  • At least a majority of the indentations have a depth of 0.01 to 10 mm, preferably 0.03 to 5 mm and most preferably 0.05 to 1 mm.
  • a second aspect of the invention relates to a hockey stick comprising a shaft as defined hereinabove.
  • a third aspect of the invention relates to a mould for producing a shaft as defined hereinabove.
  • the mould is preferably adapted to be used for compression moulding.
  • a forth aspect of the invention relates to a method for producing a shaft according to the first aspect of the invention, which method comprises the steps of
  • FIG. 1 shows a shaft for a sport stick according to a first embodiment of the present invention.
  • the shaft 1 comprises a hollow tube 2 with a circular cross section.
  • the shaft has a longitudinal direction is constituted by two regions, an upper region 3 and a lower region 4.
  • the lower region 4 is intended to be closest to the ground or floor when using the stick, while a person using the stick usually has his/her grip in the upper region 3.
  • a blade is attached to the shaft in the lower region 4 close to or at the lower end 17.
  • the blade is adapted to the sport for which the stick is intended, e.g. ice-hockey, bandy or floor ball.
  • the expression "hockey stick” as used herein encompasses sticks which are suitable for ice-hockey, bandy or floor ball, although the shaft of the present invention preferably is used for a floor ball stick.
  • the lower region 4 is about 30-90%, preferably 35-80% and most preferably 40-70 % of the length of the whole shaft 1.
  • the lower region is 50% of the whole length of the shaft.
  • the lower region is covered by a pattern of indentations.
  • the lowest portion of the shaft, adjacent to the lower end 17, has no indentations since it is intended to be inserted into a blade.
  • the shaft 1 of Figure 1 is used as a floor ball stick 1'.
  • a floor ball blade 6 is mounted at the lower end 17 of the shaft 1.
  • the upper region 3 of the shaft is covered by a handle 5, where the user grips the shaft.
  • the lower region 4 except for the portion being inside the blade 6 is covered by a pattern of indentations.
  • Figure 3 is a magnification of a portion of the lower region 4 in Figure 1 .
  • the remaining external surface of the shaft 1 in between the indentations forms intermediate areas 9 with a size being of the same order of magnitude as the size of the indentations 7, 8.
  • the shape of an indentation is taken as the shape of its opening area.
  • the opening area of an indentation is delimited by a transition from the external surface of the shaft to the indentation. If the shaft has a circular cross section like in Fig. 1-7 , the opening area is curved in one direction, being transverse to the longitudinal direction, and flat in the longitudinal direction of the shaft.
  • a round indentation 7 When looking at the shaft 1 from a distance, a round indentation 7 will look circular although its rim in a strict mathematical sense does not form a circle, which is a 2-dimensional geometry, but instead forms a curved opening area as described above. In the same way an elliptic indentation look elliptic although it as well has an opening area which is curved in the transverse direction.
  • Figure 4 is a cross section of the shaft 1 along the line A-A in Figure 3 .
  • the cross section cuts through two round indentations 7.
  • Each round indentation 7 has a depth d and a diameter b.
  • the depth d as used herein is the perpendicular distance from the corresponding surface line 12 of a shaft with a flat surface (shown as a dashed line) to the deepest point of the indentation.
  • the diameter b is measured along the corresponding surface line 12.
  • the depth is typically 0.01 to 10 mm, preferably 0.03 to 5 mm and most preferably 0.05 to 1 mm.
  • the diameter is typically 0.5 to 20 mm, preferably 1 to 15 mm, most preferably 1.5 to 10 mm.
  • the opening angle ⁇ is defined as the angle between the corresponding curvature of the shaft, which is aligned with the external surface of the shaft 1 and the flank 11 of the indentation at the opening of the indentation 7. In this cross section the corresponding curvature coincides with the corresponding surface line 12.
  • the round indentations 7 are shallow and a have a hemi-spherical cross section.
  • the peripheral wall 13 of the indentation is smooth. As used herein, the expression “smooth" relates to that that the wall has no abrupt angular changes except for possibly at the opening.
  • the opening edge 14 being at the transition between the indentation and the external surface of the shaft, could preferably be rounded off, like in Figure 4 , to avoid sharp corners.
  • Figure 5 is a cross-section through one of the indentations of Fig 3 in the transverse direction of the shaft.
  • the dashed-dotted line (-••-) shows the shape of a corresponding curvature 20, that is the curvature the shaft would have had, if there were no indentations and the shaft had a circular cross section.
  • the corresponding surface line 12 (dashed line) is a line between the opening edges 14 of the indentation 7.
  • the diameter b is measured along the corresponding surface line 12.
  • the opening angle ⁇ is the angle between the corresponding curvature 20 of the shaft, which is aligned with the external surface of the shaft 1 having no indentations, and the flank 11 of the indentation at the opening of the indentation 7
  • Figure 3 also shows elliptical indentations 8 with a major axis c and a minor axis e.
  • the elliptical indentation 8 has a three-dimensional shape as a cut-away portion of an ellipsoid, a so called hemi-ellipsoidal shape. The shape of the opening area when seen from a distance, and being a section of an ellipsoid is thus elliptical.
  • Figure 6 and 7 show cross sections of the elliptical indentations 8.
  • Figure 6 being cross section C-C along the major axis
  • Figure 7 the cross section D-D along the minor axis.
  • the minor axis is about 65% of the major axis.
  • the elliptical indentations 8 are smaller than the round indentations 7 and not as deep.
  • the round indentations 7 have a diameter of 3 mm and are 0.2 mm deep.
  • the elliptical indentations 8 have a 1.6 mm major axis c, a 1.2 mm minor axis e and are 0.1 mm deep. It would of course also be possible to give the elliptical 8 and round indentations 7 the same area or let the elliptical indentations 8 be larger and/or deeper than the round indentations.
  • the embodiment of Figures 1-7 have the indentations evenly distributed over most of the lower region 4 of the shaft.
  • the indentations could also be placed in groups with areas with a smooth external surface of the shaft in between.
  • reference is made to the second embodiment shown in Figure 8 where the indentations are arranged in bands 21 with smooth areas without indentations in between the bands 21.
  • the smooth areas could for example offer a good grip under circumstances where the player needs to grip the lower region 4 of the shaft 1.
  • the indentations could also be distributed along more or less the whole length of the lower region 4 but only at part of the circumference, e.g. half of the circumference. That part can then be arranged so that this portion of the stick meets the air when moving the stick for e.g. a fore-hand stroke.
  • Figure 9 shows a third embodiment of the present invention. All indentations in the third embodiment are elliptical, but they are of two different sizes, a first set of small indentations 15 and a second set of large indentations 16. The indentations are arranged so that each small indentation 15 has four large indentations 16 as closest neighbours, while each large indentation 16 has four small indentations 15 as closest neighbours. Most of the lower region is covered by a pattern of indentations.
  • the general shape of the shaft 1 is preferably frusto-conical.
  • the diameter of the shaft is largest at the upper end 18 and reduces gradually towards the lower end 17.
  • the pattern of the indentations has been adopted in order to compensate for this decrease of diameter, by using the same number of indentations per a certain circumference of the shaft and making the indentations more elongated by for example keeping the major axes of the ellipses and reducing the minor axes.
  • the pattern of indentations could for example also be adapted to a reduced diameter of the shaft by reducing the number of indentations per circumference, making all indentations smaller according to scale, by skipping some indentations or by making the intermediate areas 9 in between the indentations smaller.
  • Figure 10 shows a fourth embodiment which is similar to Figure 9 , but with more and smaller indentations
  • the shaft comprises a hollow tube.
  • the wall thickness of the tube should be adapted to withstand the mechanical stresses but at the same time using as little material as possible to keep weight down. Different sports have different needs.
  • a wall thickness of a shaft for a floor ball stick may be in the range of 0.5 to 1 mm.
  • the indentations are normally made so that the indentations have substantially the same wall thickness as the neighbouring portion of the shaft, as shown principally in the cross sections in Fig. 4-7 .
  • each indentation the has a corresponding protrusion on the wall surface inside the hollow tube.
  • the indentations could also be formed as local compressions, that is the peripheral wall of the indentation is thinner than the wall of the rest of the shaft and has a locally higher density.
  • the wall inside the tube is then flat.
  • the indentations could also be formed by a combination of these two ways.
  • the hollow tube 2 could have any cross-sectional shape. Depending on the type of sport the stick is intended for, it could for example have circular, elliptical, square or rectangular cross-section. There could also be intermediate shapes, e.g. a rectangle with rounded-off corners. There could also be transitions, e.g. where one section of the shaft has a round shape and another section ellipsoidal with transitions there in between.
  • indentations It is in general preferred to use shapes and sizes for the indentations, which makes it possible to pack them closely on the surface. This can be achieved by mixing two or more sets of indentations like in Fig 1-7 , Fig 9 or Fig 10 , where the indentations have two different sizes and the smaller ones are in between the larger ones. The indentations could be so closely packed that they are tangent to the closest neighbouring indentations. It is also possible to distribute the indentations rather sparsely with large areas in between without indentations. At least 10%, preferably at least 20% and most preferably at least 40% of the external surface of the shaft should preferably be covered by indentations.
  • the sum of the opening areas of all the indentations should be compared to the area of the external surface of the shaft, should there be no indentations on the shaft, i.e. the surface area of a smooth shaft.
  • indentations could have in principle any shape. They could for example be polygonal, e.g. square, rhombic, rhomboidal, hexagonal or octagonal. Square, rhombic, rhomboidal and hexagonal shapes could be closely packed. Octagonal indentations could be mixed with square indentations also giving the possibility to pack the indentations closely. Also non-polygonal shapes are possible.
  • the indentations could be chosen to fulfil the following condition: at least one of the indentations has a largest extension in a first direction along the shaft, wherein the indentation further has an extension in a second direction, the first and second directions being substantially perpendicular, wherein a first measure in the first direction of the indentation is within the range of 1 - 10, preferably 1 - 5, more preferably 1 - 2, times a second measure in the second direction of the indentation.
  • the first direction coincides with the longitudinal direction of the shaft, but the first direction could be any direction being on the external surface of the shaft.
  • the number of indentations per circumference depends on the size of the indentations and how closely they are packed.
  • the shown embodiments show 4, 6 and 8 indentations per circumference, but there might be fewer or more.
  • the number of indentations on the whole shaft varies depending on e.g. size, shape, how closely they are packed, how large percentage of the area is covered.
  • the number of indentations on a shaft is normally between 25 and 1500, preferably between 50 and 1000 and most preferably between 100 and 500.
  • the peripheral wall 13 of the indentation is smooth.
  • smooth relates to that that the wall has no abrupt angular changes except for possibly at the opening. Normally the edge at the opening is rounded off to avoid a sharp edge.
  • the three-dimensional form of the indentation should be adapted to its shape. A round indentation could preferably have a hemi-spherical form and an elliptical indentation a hemi-ellipsoidal, that is a cut-off portion of an ellipsoid. If using indentations with polygonal shape, the three-dimensional form should preferably be smooth without abrupt angular changes.
  • a shaft intended to be used for a floor ball stick could have a pattern of indentations comprising a first set of large round indentations with a diameter of 3 mm and a depth of 0.2 mm, and a second set of small round indentations with a diameter of 1.6 mm and a depth of 0.1 mm.
  • the indentations are arranged so that each large round indentation is surrounded by four small round indentations as closest neighbours and each small round indentation is surrounded by four small large indentations as closest neighbours.
  • the distance from one large round indentation to the nearest large indentation is 1-2 mm.
  • the large indentations are arranged so that a large indentation has its nearest large indentations in the directions 0°, 90°, 180° and 270°.
  • the small indentations are in between the large indentations, that is in 45°, 135°, 225° and 315°.
  • the shaft for a sport stick could be made in a mould 30 like the one showed schematically in Figure 12 .
  • the mould is shown in its open state, so that the two halves, a first half 31 and a second half 32, could be seen.
  • this mould 30 is intended for making one shaft at the time, but any number of shafts, including 1, 2, 3, 4 and 8 could be made at the same time by using multiple cavities.
  • a channel 33 in the first half together with the corresponding channel 34 in the second half 32 will form a mould cavity.
  • the geometrical form of the mould cavity reflects the geometry of the shaft, which is intended to be produced in the mould 30.
  • the wall of the mould cavity has protrusions 35 corresponding to the indentations of the shaft to be produced. What has been said above about the geometry of the indentations is thus valid for the protrusions 35 correspondingly.
  • the mould 30 further comprises at least one inlet 36, where air can enter into the cavity. If more than one shaft is intended to be produced at the same time it is preferred to use a number of inlets 36, at least one for each channel.
  • Protrusions 37 on the second half 32 are fitted into corresponding bores 38 when closing the mould 30, in order to secure that the two halves 31, 32 are aligned to each other.
  • the invention also relates to a method to produce shafts for sport sticks, like the shafts with indentations as described above.
  • a suitable method is so called compression moulding.
  • the method comprises a number of steps. First an intermediate material is prepared. Reinforcing fibres, such as carbon and glass, are embedded in a resin. Typically the resin is a thermosetting material such as epoxy, polyester, vinyl, phenolic, polyimide.
  • the intermediate material is typically prepared in the form of sheets.
  • the next step is to form a tubular structure.
  • a cover is applied to a core, e.g. a steel core covered by a nylon bag.
  • This cover is covered by a layer or a plurality of layers made of the intermediate material. If a plurality of layers is used, the layers could be arranged so that the reinforcing fibres therein have different orientation from one another. The layers could for example be wound on the core as strips.
  • the core is removed and the rest of the structure is moved to a mould 30 as the one described above, in order to attain the desired shaft by applying heat and air pressure.
  • Air fittings are applied to the interior of the tubular structure through the inlets 36.
  • the two halves 31, 32 of the mould 30 are closed and the mould 30 is placed in a platen press.
  • the tubular structure is pressurized from the inside.
  • the material of the tubular structure compresses and the tubular structure is forced to adapt to the geometrical form of the mould.
  • the heat cures the intermediate material.
  • the temperature and pressure depends on the material used but could, purely as an example, be about 155°C, with a curing time of 30 min and an air pressure which gradually is increased to 15 bar.
  • the shaft formed by the tubular structure is cooled and the mould is opened and the shaft taken out for further processing such as grinding and lacquering.

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Claims (13)

  1. Tige (1) pour crosse de hockey comprenant un tube creux allongé (2) avec une surface externe, ladite surface externe étant pourvue d'une pluralité d'indentations (7, 8, 15, 16) de sorte que l'aérodynamique de ladite tige soit modifiée par lesdites indentations par comparaison avec une tige ayant une surface lisse,
    caractérisée en ce que chacune desdites indentations (7, 8, 15, 16) a une épaisseur de paroi qui est sensiblement la même que l'épaisseur de paroi d'une partie voisine de ladite tige (1).
  2. Tige (1) selon la revendication 1, dans laquelle lesdites indentations (7, 8, 15, 16) couvrent au moins 10 %, de préférence au moins 20 % et avec le plus de préférence au moins 40 % de ladite surface externe de ladite tige (1).
  3. Tige (1) selon la revendication 1 ou 2, dans laquelle ladite tige (1) est constituée d'une région supérieure (3), apte à former une poignée (5) pour ladite tige (1), et une région inférieure (4), lesdites indentations (7, 8, 15, 16) étant sensiblement concentrées sur ladite région inférieure.
  4. Tige (1) selon la revendication 3, dans laquelle lesdites indentations (7, 8, 15, 16) couvrent au moins 20 %, de préférence au moins 30 % et avec le plus de préférence au moins 60 % de la surface externe de ladite région inférieure (4).
  5. Tige (1) selon l'une quelconque des revendications précédentes, dans laquelle au moins une majorité desdites indentations (7, 8, 15, 16) a un angle d'ouverture (α) de moins de 90°, de préférence de moins de 75° et avec le plus de préférence de moins de 60°.
  6. Tige (1) selon l'une quelconque des revendications précédentes, dans laquelle au moins l'une desdites indentations (7, 8, 15, 16) a une extension la plus grande dans une première direction le long dudit tube creux (2), dans laquelle ladite indentation comprend en outre une extension dans une deuxième direction, lesdites première et deuxième directions étant sensiblement perpendiculaires l'une à l'autre, dans laquelle une première mesure dans ladite première direction de ladite indentation est dans la plage de 1 à 10, de préférence de 1 à 5, et avec plus de préférence de 1 à 2 fois une deuxième mesure dans ladite deuxième direction de ladite indentation.
  7. Tige (1) selon l'une quelconque des revendications précédentes, dans laquelle la pluralité d'indentations comprend un premier ensemble (7 ; 15) et un deuxième ensemble (8; 16) d'indentations, la conception des indentations dudit premier ensemble étant différente de la conception des indentations dudit deuxième ensemble.
  8. Tige (1) selon l'une quelconque des revendications précédentes, dans laquelle, pour chacune d'au moins une majorité desdites indentations (7, 8, 15, 16), une transition de ladite surface externe de ladite tige (1) à ladite indentation définit une surface d'ouverture qui est de 0,5 à 300 mm2, de préférence de 1 à 100 mm2, et avec le plus de préférence de 2 à 50 mm2.
  9. Tige (1) selon l'une quelconque des revendications précédentes, dans laquelle au moins une majorité desdites indentations (7, 8, 15, 16) a une profondeur de 0,01 à 10 mm, de préférence de 0,03 à 5 mm et avec le plus de préférence de 0,05 à 1 mm.
  10. Crosse de hockey, de préférence crosse de unihockey (1') comprenant une tige (1) selon l'une quelconque des revendications 1 à 9.
  11. Moule (30) pour produire la tige (1) pour une crosse de sport selon l'une quelconque des revendications 1 à 9.
  12. Moule selon la revendication 1 dans lequel le moule (30) est apte à produire la tige (1) par moulage par compression.
  13. Procédé pour produire une tige (1) pour une crosse de sport selon l'une quelconque des revendications 1 à 9, comprenant les étapes de :
    - insertion dans une cavité de moule dans un moule (30) d'une structure tubulaire fabriquée d'un matériau formable, la paroi de ladite cavité de moule reflétant la surface externe souhaitée de ladite tige (1),
    - fermeture dudit moule (30),
    - forçage dudit matériau formable pour le mettre en contact avec ladite paroi de ladite cavité de moule tout en chauffant ledit moule à une température à laquelle ledit matériau formable durcit,
    - durcissement dudit matériau formable tout en le maintenant dans ledit moule,
    - ouverture dudit moule,
    - enlèvement de ladite tige dudit moule.
EP08158250A 2008-06-13 2008-06-13 Tige pour crosse de sport Not-in-force EP2133125B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT08158250T ATE535287T1 (de) 2008-06-13 2008-06-13 Schaft für einen sportstock
EP08158250A EP2133125B1 (fr) 2008-06-13 2008-06-13 Tige pour crosse de sport

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08158250A EP2133125B1 (fr) 2008-06-13 2008-06-13 Tige pour crosse de sport

Publications (2)

Publication Number Publication Date
EP2133125A1 EP2133125A1 (fr) 2009-12-16
EP2133125B1 true EP2133125B1 (fr) 2011-11-30

Family

ID=39800501

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08158250A Not-in-force EP2133125B1 (fr) 2008-06-13 2008-06-13 Tige pour crosse de sport

Country Status (2)

Country Link
EP (1) EP2133125B1 (fr)
AT (1) ATE535287T1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2514565A (en) * 2013-05-29 2014-12-03 Evan Alun Harrison Mackrill Design to reduce vibrations in a field hockey stick when striking the ball

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2069730A1 (fr) * 1992-05-29 1993-11-30 Willi H. Velke Dispositif aerodynamique permettant d'augmenter la vitesse de frappe d'un article de sport
AU4413993A (en) * 1992-06-30 1994-01-24 Velke, Willi H. Tennis racquet having a surface structure adapted for the reduction of air resistance
US5284332A (en) * 1992-09-23 1994-02-08 Massachusetts Institute Of Technology Reduced aerodynamic drag baseball bat
JPH09299526A (ja) * 1996-05-13 1997-11-25 Junichi Hirata スポーツ道具用シャフト
EP1862201B1 (fr) 2006-05-29 2011-05-04 Prince Sports, Inc. Crosse de sport avec un seul tube primaire creux

Also Published As

Publication number Publication date
EP2133125A1 (fr) 2009-12-16
ATE535287T1 (de) 2011-12-15

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