EP4154950A1 - Raquette de jeu de balle et procédé de fabrication d'une raquette de jeu de balle - Google Patents

Raquette de jeu de balle et procédé de fabrication d'une raquette de jeu de balle Download PDF

Info

Publication number
EP4154950A1
EP4154950A1 EP21198651.8A EP21198651A EP4154950A1 EP 4154950 A1 EP4154950 A1 EP 4154950A1 EP 21198651 A EP21198651 A EP 21198651A EP 4154950 A1 EP4154950 A1 EP 4154950A1
Authority
EP
European Patent Office
Prior art keywords
tube
core
ball game
partially
game racket
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.)
Pending
Application number
EP21198651.8A
Other languages
German (de)
English (en)
Inventor
Katja FÖRSTNER
Daniel Lau
Ralf Schwenger
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.)
Head Technology GmbH
Original Assignee
Head Technology GmbH
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 Head Technology GmbH filed Critical Head Technology GmbH
Priority to EP21198651.8A priority Critical patent/EP4154950A1/fr
Publication of EP4154950A1 publication Critical patent/EP4154950A1/fr
Pending legal-status Critical Current

Links

Images

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
    • A63B59/40—Rackets or the like with flat striking surfaces for hitting a ball in the air, e.g. for table tennis
    • A63B59/42—Rackets or the like with flat striking surfaces for hitting a ball in the air, e.g. for table tennis with solid surfaces
    • 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
    • A63B60/54—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
    • 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
    • A63B2102/08—Paddle tennis, padel tennis or platform tennis
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres
    • 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
    • A63B2225/62—Inflatable

Definitions

  • Ball game rackets are available for a variety of sports and/or leisure activities, for example tennis, table tennis, badminton and squash.
  • sports and/or leisure activities there is a relatively wide range of different ball game rackets, for example made of different materials, from which the respective user can choose.
  • the material used can influence the properties of the respective ball game racket, for example its stiffness.
  • Relatively inexpensive ball game racquets are usually made, at least for the most part, of plastic or metal, such as aluminum.
  • ball game rackets are often made at least partially from more demanding materials, for example from fiber composite materials using glass fibers, carbon fibers, aramid fibers, ceramic fibers or other high-performance fibers. The use of such materials can have a positive influence on the properties of the ball game racket, for example in order to increase the performance of the ball game racket.
  • ball game racquets can have different constructions, for example different shapes and/or dimensions, which can also influence the properties of the respective ball game racquet, for example its stiffness and/or ball control.
  • specific properties of the ball game racket can be brought about in order to adapt the properties of the ball game racket to the way of playing and/or the performance of the respective user.
  • padel tennis also called paddle tennis or padel
  • padel paddle tennis
  • the popularity of padel tennis is increasing worldwide, for example in other countries in Europe, such as Sweden.
  • padel tennis as in conventional tennis, a ball is hit alternately over a net into an opposing half of the field using a ball game racket.
  • the playground has outer walls that can also be played on in order to play the ball into the opposing half of the field, similar to squash.
  • a padel tennis racquet In contrast to conventional tennis racquets, squash racquets or other ball game racquets strung with strings, a padel tennis racquet generally does not have a hitting surface formed from taut strings. Instead, the padel tennis racket has a mostly continuous plate, which is often also called a core. This plate usually defines the striking surfaces of the respective padel tennis racket. The plate is often coated or planked with an additional material in order to influence or specifically change the stiffness and/or elasticity of the racket.
  • the head portion includes a core and a first hollow tube extending partially around the core to reinforce the periphery of the head portion.
  • the first hollow tube has a rounded section at the periphery of the racquet head and a flat side on a side facing the core, which abuts as a wall against the core.
  • the ball game racquet has a second hollow tube that extends into the grip portion of the ball game racquet.
  • the first and second tubes are made of a composite material.
  • the FR 3 026 016 A1 a ball game racket for padel tennis or beach tennis.
  • the ball game racquet has a head portion with a core.
  • An outer wall of a racquet frame running around the core is additionally reinforced.
  • the ball game racket can be realized with a tubeless frame.
  • the ball game racket Due to the lack of a circumferential tube and thus the lack of an inner wall in the head section, which is defined by a core-facing side of the tube, as this for example in the FR 3 042 124 A1 is described, the ball game racket has less stiffening compared to previously known designs of padel tennis rackets with a tube running around the core, as a result of which the playability of the ball game racket can be increased. Therefore, at least for padel tennis, tubeless ball game rackets have largely prevailed over ball game rackets with a surrounding tube.
  • a first aspect of the invention relates to a ball game racket with a grip portion and a head portion connected to the grip portion.
  • the head section has a frame and at least one core.
  • the core at least partially defines two striking surfaces and at least one edge that connects the striking surfaces at least in some areas and preferably runs all the way around.
  • a first tube extends at least partially through the frame at least along at least a portion of the edge of the core.
  • the first tube is partially covered with a composite material in such a way that at least a region of an outer side of the first tube facing the edge of the core is free of composite material.
  • the grip portion may be configured to be gripped by at least one hand of a user so that the ball game racket can be moved by the user and aimed at a game ball or similar target.
  • the handle section can have properties that can make it easier for the user to grip the handle section.
  • the handle section can have at least one anti-slip surface, which can prevent or at least reduce the handle section slipping in the hand of the user.
  • the head section is preferably set up, at least in some areas, to hit the ball or target object and to transmit a force to the ball or target object in order to accelerate the ball or target object and, if possible, play it into the opposing field.
  • the head section can have properties that can facilitate or improve the power transmission of the ball and/or the acceleration of the ball and/or the ball control and/or the comfort of the ball game racket in use.
  • the frame of the head section preferably defines, at least in sections, an outer circumference of the ball game racket.
  • the core is preferably at least partially located within a space defined by the frame.
  • the handle section and the head section are preferably at least partially formed in one piece.
  • the handle section and the head section can have at least one common component that extends at least in regions through the handle section and the head section.
  • the handle section and the head section can be separate components which can then be connected to one another, for example by gluing, welding or other joining methods.
  • the core of the head portion is preferably made of a material with a relatively low Density manufactured to reduce the weight of the ball game racquet and therefore increase the handling and acceleration of the ball game racquet.
  • the core can be made at least partially, preferably entirely, from a porous material, preferably a foam material.
  • the core is preferably made of a foam material made of polyurethane (PU), ethylene vinyl acetate (EVA) or a thermoplastic elastomer (TPE-A). However, other foam materials or other alternative materials may also be used.
  • the core may also have at least one aperture, preferably a plurality of apertures.
  • the opening extends completely through the core, at least in a portion of the core, along a longitudinal axis.
  • the weight of the core can be reduced.
  • air can flow through the respective opening in order to reduce the aerodynamic drag of the ball game racket during use.
  • the rigidity and/or the elasticity and/or the resilience of the ball game racket can be specifically controlled, i.e. reduced or increased, through the opening or openings.
  • the stiffness and/or the elasticity of the ball game racket can be varied by selecting the relative arrangement, dimensions, shape and/or number of openings.
  • the core has a plurality of openings which are distributed in a pattern in the core.
  • the openings are preferably arranged in a matrix-like manner, for example in one row or in a plurality of rows, preferably arranged next to one another.
  • the ball game racket can additionally have a material applied to the core at least in regions, for example a single-layer or multi-layer coating.
  • the opening or openings which may be provided in the core preferably also extend through the additional material applied to the core in this case.
  • the core can be made in one piece. Alternatively, the core can be constructed in several parts. In a multi-piece construction, a plurality of core segments can be assembled to form the core. The individual core segments can be firmly connected to one another, for example by means of an adhesive and/or other joining means. The Core segments can alternatively or additionally be connected to one another by an element extending at least in regions over the core and/or around the core, for example a cover, a frame, a planking, a coating or the like.
  • the core at least partially defines two striking surfaces and at least one edge that connects the striking surfaces at least in some areas and preferably runs all the way around.
  • the striking surfaces can be designed to transfer forces directly or indirectly from the user and via the ball game racket to the game ball or similar target object.
  • the interaction of the game ball with the ball game racket, and thus the playability of the ball game racket can be specifically controlled by developing the properties of the core, for example its rigidity, flexibility, resilience, etc.
  • the ball acceleration, the ball control and/or the comfort of the ball game racket can be influenced by a targeted choice of the properties of the core and can thus be adapted to the playing style and playing performance of the user.
  • the properties of the core can be influenced or controlled, for example, by the choice of the material or materials and/or the dimensions and/or the shape of the core.
  • the core can be made at least partially, preferably entirely, from a porous material, preferably a foam material.
  • the core is preferably made of a foam material made of polyurethane (PU), ethylene vinyl acetate (EVA) or a thermoplastic elastomer (TPE-A). However, other foam materials or other alternative materials may also be used.
  • the impact surfaces are preferably each designed as a flat surface.
  • the striking surfaces are preferably arranged essentially opposite one another.
  • the striking surfaces preferably run essentially parallel to one another.
  • the striking surfaces can run at an angle to one another, preferably in an angular range of 0.5° to 20°, more preferably 0.5° to 15°, most preferably 0.5° to 10°.
  • the edge preferably extends substantially perpendicularly to one of the striking surfaces, preferably to both striking surfaces.
  • the edge can run at an angle that is greater or less than 90° to at least one of the two striking faces.
  • the edge may be at an angle of 60° to 89.5°, preferably 70° to 89.5°, more preferably 75° to 89.5°, more preferably 80° to 89.5°, most preferably from 85° to 89.5° to at least one of the two striking surfaces.
  • the striking surfaces can be contact surfaces that come into direct contact with the ball or target object when the ball or target object hits the ball game racket.
  • the core can be covered at least in regions with a cover material, which can thus come into direct contact with the ball or target object when it hits the ball game racket.
  • the core can be coated at least in regions, preferably completely, with at least one material layer, preferably a multiplicity of material layers, preferably made of a composite material.
  • the striking surfaces are preferably completely coated with at least one layer of material, preferably a multiplicity of layers of material.
  • the layer of material preferably comprises a composite material. Stiffening and/or increased stability of the core caused by the cover material can be controlled via the selection of the cover material, for example its structure and/or composition, and/or via the number of layers of the cover material.
  • the cover material can provide a contact surface for direct contact with the ball or playing object.
  • the core preferably serves as a receiving structure and/or transmission structure that can absorb forces from the ball and/or transmit forces to the ball.
  • a first tube extends at least partially through the frame at least along at least a portion of the edge of the core.
  • the first hose is preferably made of a plastic, preferably made of polyamide, co-polyamide, polyethylene, polypropylene or a similar material.
  • the plastic is preferably stretched before the hose is installed in the ball game racket.
  • the first tube preferably has a peripheral wall and a cavity defined within the peripheral wall. The cavity preferably extends over the entire length of the hose.
  • the hose itself preferably has intrinsic flexibility and/or elastic deformability.
  • the hose extends along 30% to 100%, more preferably along 35% to 100%, more preferably along 40% to 100%, more preferably along 45% to 100%, more preferably along 50% to 100%, more preferably along 55% to 100% %, more preferably along 60% to 100%, more preferably along 65% to 95%, most preferably along 65% to 90%, of a perimeter of the rim of the core.
  • the first tube is partially covered with a composite material in such a way that at least an area of an outer side of the first tube facing the edge of the core is free of composite material.
  • the first hose can be wrapped with a composite material at least in certain areas.
  • the composite can be selected from a variety of composites.
  • the composite material can be selected according to the desired properties, for example the desired rigidity and/or damping properties of the ball game racket.
  • the composite material preferably has a large number of synthetic fibers, preferably carbon fibers and/or glass fibers.
  • the composite material can have a large number of natural fibers, for example flax and/or bamboo fibers.
  • the fibers are preferably embedded in at least one matrix material.
  • Ball game rackets that have a tube that extends through the respective frame in some areas are usually manufactured by means of a so-called tube blow molding process.
  • the ball game racquet described herein can also be manufactured using the tubular blow molding process.
  • the tube is usually either produced from a composite material or at least rolled up with a composite material over the entire circumference of the tube and then placed in a heatable mold.
  • Such a structure and a corresponding manufacturing method are, for example, in the aforementioned FR 3 042 124 A1 described.
  • the hose has openings at its two ends, which are fluidically connected to one another via the hollow space of the hose.
  • At least one of the ends of the hose is usually connected to a source of pressurized gas, preferably a source of compressed air.
  • the mold can then be heated and pressurized gas applied to the cavity of the hose to heat the composite while simultaneously pressing it against the interior surfaces of the mold so that the ball game racquet can best assume the desired shape and/or geometry.
  • the hose reinforced with composite material When a compressed gas is applied to the hollow space of the hose, the hose reinforced with composite material is expanded, as a result of which the hose presses against the core arranged at least partially within the hose and thereby braces and/or compresses it at least in regions.
  • the tubing Upon curing of the all-composite wrapped or all-composite tubing, the tubing will solidify in this expanded position, thereby retaining the core and tubing in previously known ball game racquets even after the pressurized gas supply to the tubing has been completed and the ball game racquet has been removed from the mold remain substantially in a strained and/or stiffened state.
  • the stiffening and/or compression of the core, particularly in the areas of the core close to the tube, by the tube can negatively affect the playability of the ball game racket.
  • the relatively high rigidity of the core caused at least in certain areas, especially in the areas of the core close to the hose can have a negative effect on ball control in the stiffened areas and generally in the edge area of the ball game racket.
  • the resulting relatively high non-uniformity in the stiffness of the core which can increase in particular due to the above-described tension through the tube to the edge of the core, impair the playability of the ball game racket.
  • edge area of the ball game racket is a relatively large distance from the grip section compared to areas that are arranged closer to the center of the respective striking surface, a collision of the game ball with the edge area of the ball game racket can cause relatively large forces and/or moments on the hand and/or transferred to the arm of the user, which can cause an increased risk of injury and/or impair the comfort of the ball game racket.
  • These effects can be favored by increased rigidity in the edge area of the ball game racket.
  • a softer structure and/or greater elastic deformability in the edge area of the ball game racket can result in greater cushioning of the ball game racket, as a result of which the risk of injury can be reduced and the comfort of the ball game racket can be increased.
  • a gap preferably an air gap
  • a cavity is arranged between the edge of the core and the composite material-free area of the first tube, with neither a part of the tube nor a part of the core being arranged in this cavity.
  • This reduces the rigidity in the edge area of the ball game racket can be further reduced to further improve the playability of the ball game racket.
  • the complete non-composite portion of the first tube and the edge of the core are non-contact with each other.
  • tubeless ball game rackets have largely prevailed over ball game rackets with a surrounding tube, at least for padel tennis in recent years.
  • the configuration of the ball game racquet with a tube described herein has advantages over tubeless ball game racquets, for example compared to that in US Pat FR 3 026 016 A1 described ball game racket, surprisingly advantages.
  • a smaller core can be used compared to tubeless ball game racquets because the tube replaces part of the core in the peripheral area of the ball game racquet.
  • the weight of the ball game racket can be reduced in comparison to tubeless ball game rackets with the same or at least similar dimensions.
  • the material weight that is saved as a result, especially at the edge area of the ball game racket, can be used or used elsewhere.
  • the edge area of the ball game racket can be made more robust as a result, for example by providing thicker material thicknesses and/or additional material. As a result, the robustness of the ball game racket, especially in the edge area of the same, can be increased.
  • the rackets used can be exposed relatively frequently to high loads, for example as a result of the ball rackets accidentally hitting wall structures that adjoin the playing field in padel tennis.
  • a robust design of the ball game racket, in particular the edge area of the same, can increase the service life of the ball game racket.
  • the provision of a tube used to shape the ball game racquet allows for a more flexible and/or more precise configuration of the edge of the head portion of the ball game racquet compared to tubeless ball game racquets.
  • the shape and/or geometry of the frame can be varied in a reliable, flexible and relatively simple manner.
  • a configuration of the edge of the head section in tubeless ball game rackets, in which the core essentially extends to the edge of the respective ball game racket, is significantly more complex and/or has less design freedom.
  • the edge of the core has to be cut out relatively precisely in order to realize a respectively desired contour and/or geometry of the edge of the core.
  • the blow-tube process for manufacturing a tube-equipped ball game racquet can achieve higher performance and/or durability each using a composite material compared to the manufacturing process of a tubeless ball game racquet.
  • the individual layers of the composite material can be compressed more strongly when the tube is subjected to compressed gas than during the manufacturing process of a tubeless ball game racket. As a result, the quality and/or the durability of the ball game racket can be increased.
  • the ball game racket described herein may be particularly suitable for padel tennis. However, the ball game racket can also be suitable for other sports and/or leisure activities in which a ball game racket is used.
  • the first tube extending along at least a portion of the edge of the core, substantially 10% to 50%, preferably 10% to 40%, more preferably 10% to 30%, most preferably 15% to 30% , an outer periphery of the first hose free of composite material.
  • These value ranges can enable elastic deformation and/or elastic resilience of the hose in the composite-free area in order to prevent or at least reduce stiffening and/or tensioning of the core by the hose.
  • the playability of the ball game racket, in particular in the edge area of the ball game racket can be increased.
  • the composite material extends, at least in the area of the first tube extending along at least a portion of the edge of the core, over 50% to 90%, preferably 60% to 90%, more preferably 70% to 90%, most preferably 70% to 85%, an outer circumference of the first tube.
  • a gap between the edge of the core and the outside of the first tube preferably extends at least in regions along the first tube.
  • the gap has a gap width extending from the core to the outside of the first tube from 0.5 mm to 10 mm, preferably from 0.5 mm to 8 mm, more preferably from 0.5 mm to 6 mm, more preferably from 0.5 mm to 6 mm 0.5 mm to 5 mm, more preferably from 0.5 mm to 4 mm, more preferably from 0.5 mm to 3 mm, more preferably from 0.5 mm to 2 mm, more preferably from 0.5 mm to 1.5 mm, most preferably from 0.5mm to 1mm.
  • the first hose preferably extends at least in regions through the frame and the handle section.
  • the first tube is only partially covered with a composite material along its entire extent through the frame and handle portion.
  • only the portion of the tube that extends through the frame may be partially covered with a composite material such that at least a portion of an outside of the first tube facing the edge of the core is free of composite material.
  • the portion of the hose that extends through the handle portion can be completely covered with a composite material. As a result, the composite material can produce a higher rigidity effect in the grip portion than in the frame.
  • the first tube in the head portion extends around the entire periphery of the core. This allows essentially the entire contour of the hitting faces to be formed by the tube, increasing the stability of the core and the hitting faces can be increased.
  • the entire portion of the tube extending around the edge of the core is partially covered with a composite material such that at least a portion of an outer side of the first tube facing the edge of the core is free of composite material.
  • the entire area of the outside of the first tube facing the edge of the core is free of composite material.
  • the ball game racket preferably has at least one additional tube which extends at least in certain areas through the head section and/or through the grip section.
  • different areas of the ball game racket can each be individually equipped with a hose.
  • different hoses for example made of different materials and/or with different geometries, can be used.
  • the hoses can be individually charged with a respective gas pressure.
  • the hoses can be charged with different gas pressures and/or with different courses and/or different profiles of the pressurized gas charge.
  • areas of the ball game racket can be designed individually, for example with different rigidities and/or different elastic deformabilities and/or different elastic restoring properties.
  • the additional tube preferably extends at least in certain areas through the handle section and from the handle section only in some areas into the head section and ends there.
  • the extension of the additional hose into the head section can be limited, so that the additional hose can have a predetermined, preferably only minimal, influence on the stiffness in the head section.
  • the additional hose can, for example, be completely covered or wrapped with a composite material over its circumference, in order to create a through the additional hose relatively high stiffness in the handle portion and comparatively less stiffness in the head portion.
  • the ball game racket preferably has at least two additional hoses, each of which extends at least partially through the head section and/or through the grip section.
  • the two additional hoses preferably each extend at least in certain areas through the handle section and from the handle section only in some areas into the head section and each end there.
  • the two additional tubes extend in different directions from the handle portion into the head portion.
  • the core is preferably made at least partially, preferably entirely, from a foam.
  • the composite material is preferably a fiber-plastic composite, preferably a carbon-fiber-reinforced and/or glass-fiber-reinforced plastic.
  • the ball game racket additionally has at least one coating, which extends at least in some areas over the core, preferably at least over the striking surfaces, and at least in some areas over the first tube.
  • the coating connects the core and the first tube together.
  • the coating can come into direct contact with the ball or target object.
  • the coating preferably comprises a composite material. Stiffening and/or increased stability of the core brought about by the coating can be controlled via the selection of the coating material, for example its structure and/or composition, and/or via the number of layers of the coating.
  • the coating preferably has at least one layer made of a composite material, preferably a fiber-plastic composite, preferably a carbon-fiber-reinforced and/or glass-fiber-reinforced plastic.
  • the handle section and/or the head section preferably in a fork area of the ball game racket, has an expandable material, preferably an expanded polystyrene (EPS), which is set up to expand through activation, preferably through the supply of heat.
  • EPS expanded polystyrene
  • the expandable material can also bring about compression and/or compression of composite materials, in that the expandable material expands in a targeted manner during the production of the ball game racket and presses the composite material against the corresponding heatable mold during the blow molding process. As a result, the stability and durability of the ball game racket can be increased.
  • stiffening and/or tensioning of the core by the hose can be prevented or at least reduced in order to achieve a softer structure and/or greater elastic deformability, especially in the edge area, of the ball game racket.
  • the playability of the ball game racket, particularly in the edge area of the ball game racket can be improved.
  • At least the hose coated with composite material is preferably placed in a heatable mold at least before step f), in which at least steps f) and g) can be carried out at least partially.
  • a large number of openings can be introduced at least through the core and the second composite material.
  • the openings are preferably formed as through openings which extend completely through the ball game racquet.
  • the openings preferably extend perpendicularly to at least one striking surface, preferably to both striking surfaces, through the ball game racket.
  • the outside of the first tube is partially coated with a composite such that substantially 10% to 50%, preferably 10% to 40%, more preferably 10% to 30%, most preferably 15% to 30% , an outer circumference of the first hose is free of composite material.
  • the outside of the first hose is partially coated with a composite material in such a way that the composite material changes over 50% to 90%, preferably 60% to 90%, more preferably 70% to 90%, most preferably 70% to 85% of an outer circumference of the first tube.
  • step f the application of excess pressure to the cavity of the first hose is ended.
  • a gap is then formed between the edge of the core and the outside of the first tube, preferably at least in regions along the first tube.
  • the gap has a gap width extending from the core to the outside of the first tube from 0.5 mm to 10 mm, preferably from 0.5 mm to 8 mm, more preferably from 0.5 mm to 6 mm, more preferably from 0.5 mm to 6 mm 0.5 mm to 5 mm, more preferably from 0.5 mm to 4 mm, more preferably from 0.5 mm to 3 mm, more preferably from 0.5 mm to 2 mm, more preferably from 0.5 mm to 1.5 mm, most preferably from 0.5mm to 1mm.
  • the first tube is arranged such that the first tube extends at least partially along at least a portion of the edge of the core around the core and at least partially through the grip portion of the ball game racket.
  • the first tube is arranged such that the first tube in the head portion extends around the entire edge of the core.
  • At least one additional hose is arranged in the head section and/or in the handle section.
  • the additional hose is arranged in the head section and/or in the grip section in such a way that it extends at least partially through the grip section and from the grip section only partially into the head section of the ball game racket and ends there.
  • At least two additional hoses are each arranged in the head section and/or in the handle section.
  • the two additional hoses are preferably arranged in the head section and/or in the handle section in such a way that the two additional hoses each extend at least partially through the handle section and from the handle section only partially into the head section and end there.
  • the two additional hoses extend into the head section in different directions.
  • the outside of the first hose is partially coated with a composite material in such a way that the entire area of the outside of the hose facing the core is free of composite material.
  • the core is preferably made at least partially, preferably entirely, from a foam.
  • the first composite material and/or the second composite material is preferably a fiber-plastic composite, preferably a carbon-fiber-reinforced and/or glass-fiber-reinforced plastic.
  • an expandable material preferably an expanded polystyrene (EPS)
  • EPS expanded polystyrene
  • the expandable material is preferably set up to expand through activation, preferably through the supply of heat.
  • the cavity of the first hose is preferably subjected to an overpressure of 2 bar to 10 bar, preferably 2 bar to 5 bar.
  • overpressure within the meaning of the present disclosure is to be understood as an absolute pressure that is higher than the respective ambient pressure prevailing at the production site.
  • a relatively high compression and/or shaping of the composite material used can be achieved with the value ranges specified above for pressurization of the first hose.
  • the cavity of the first hose is subjected to a variable overpressure.
  • the hose can be subjected to different gas pressures and/or different courses and/or profiles of the compressed gas admission over a continuous or discontinuous time course.
  • the overpressure can also be varied, for example, at the same time and/or at different times together with variable heat generation in a heatable mold into which the tube can be inserted at least before step f). At least steps f) and g) can be carried out at least partially in the heatable mold.
  • the cavity of the first tube is subjected to a pulsating overpressure.
  • the properties of the ball game racket for example its rigidity and/or elastic deformability and/or elastic resilience, can be optimized or specifically changed. Desired and/or predefined properties of the ball game racket can be brought about in particular via the pulse strength, pulse duration and/or pulse frequency.
  • the pulsing of the overpressure can be coordinated, for example, with a variation in the generation of heat in a heatable mold into which the hose can be inserted at least before step f).
  • the cavity of the first hose is subjected to a, preferably predetermined, profile of an at least temporarily inconstant pressure curve over a pressurization time.
  • the cavity of the first tube is subjected to a first overpressure and the cavity of the one additional tube or the cavities of the at least two additional tubes are each subjected to a second overpressure.
  • the first overpressure and the second overpressure are preferably different.
  • Areas of the ball game racket can be individually designed, for example with different stiffnesses and/or different elastic deformabilities and/or different elastic recovery properties. As a result, the properties of the ball game racket, more precisely the properties of different areas of the ball game racket, can be optimized and/or adapted to the wishes and/or needs of the user.
  • the cavity of the first hose is subjected to a first overpressure of 2 bar to 5 bar and the cavity of one additional hose or the cavities of the two additional hoses are subjected to a second overpressure of 2 bar to 10 bar .
  • the additional hoses are preferably subjected to a higher overpressure than the first hose.
  • the second overpressure is applied to the cavity of the one additional tube or the cavities of the two additional tubes and the first excess pressure is applied to the cavity of the first tube at least partially at different times.
  • the first hose and the two additional hoses can be arranged in the ball game racquet such that at least two of the hoses extend through the ball game racquet partially overlapping, or at least substantially adjacent to one another. The fact that the two additional hoses and the first hose are acted upon at different times can prevent or at least reduce increased compaction and/or compression as a result of simultaneous expansion of the two additional hoses and the first hose.
  • the start of the application of the second overpressure to the cavity of the one additional hose or the cavities of the two additional hoses preferably takes place with a time delay, preferably by 2 to 30 seconds, after the start of the application of the lumen of the first tube with the first positive pressure.
  • the ball game racket 10 has a grip portion 12 and a head portion 14 connected to the grip portion 12 .
  • the head portion 14 includes a frame 16 and a core 18 .
  • the core 18 defines two striking surfaces 20. Due to the in 1 perspective shown is just a 20 in 1 to see. Both striking surfaces 20 are in the in 2 shown cross-sectional view.
  • the second striking surface 20 can be essentially parallel to the in Fig.1 shown face 20 run.
  • the two striking surfaces 20 are preferably essentially opposite one another arranged.
  • the core 18 also defines a peripheral edge 22 connecting the striking surfaces 20.
  • the ball game racket 10 has a transition region 23 which connects the grip section 12 to the head section 14 .
  • the transition area 23 has an opening 25 .
  • the transition area 23 is often also referred to as the "heart” or "throat".
  • the ball game racquet 10 also includes a first tube 24 that extends through the frame 16 along a portion of the rim 22 of the core 18 .
  • the hose 24 is only shown schematically as a solid line in 1 shown. In 2 the tube 24 is shown in more detail.
  • the first tube 24 has a peripheral wall 26 and a cavity 28 defined within the peripheral wall 26 .
  • the cavity 28 preferably extends over the entire length of the tube 24.
  • the hose 24 has, as shown in FIG 2 a substantially square cross-sectional shape.
  • other cross-sectional shapes are also conceivable, for example a round, elliptical, triangular or polygonal cross-sectional shape.
  • the cross-sectional shape of the hose 24 formed in the ball game racket 10 essentially depends on the geometry of a compression mold in which the ball game racket 10 is pressed and cured in a blow molding process. The tubular blow molding process is described in more detail below.
  • the hose 24 is partially covered with a composite material 30 in such a way that at least one area 32 of an outer side of the hose 24 facing the edge 22 of the core 18 is free of composite material.
  • a gap 36 extends between the edge 22 of the core 18 and an exterior of the first tube 24.
  • the ball game racket 10 can additionally have a coating 34 which extends at least over the core 18 and the first tube 24 .
  • the coating 34 can come into direct contact with the ball or target object.
  • the coating 34 preferably comprises a composite material. For the sake of clarity, the coating 34 is in 1 not shown.
  • the tube is usually either produced from a composite material or at least rolled up with a composite material over the entire circumference of the tube and then placed in a heatable mold.
  • a structure and a corresponding manufacturing method are, for example, in the aforementioned FR 3 042 124 A1 described.
  • the hose has openings at its two ends, which are fluidically connected to one another via the hollow space of the hose. At least one of the ends of the hose is usually connected to a source of pressurized gas, preferably a source of compressed air.
  • the mold can then be heated and pressurized gas applied to the cavity of the hose to heat the composite while simultaneously pressing it against the interior surfaces of the mold so that the ball game racquet can best assume the desired shape and/or geometry.
  • the hose reinforced with composite material When a compressed gas is applied to the hollow space of the hose, the hose reinforced with composite material is expanded, as a result of which the hose presses against the core arranged at least partially within the hose and thereby braces and/or compresses it at least in regions.
  • the tubing Upon curing of the all-composite wrapped or all-composite tubing, the tubing will solidify in this expanded position, thereby retaining the core and tubing in previously known ball game racquets even after the pressurized gas supply to the tubing has been completed and the ball game racquet has been removed from the mold remain substantially in a strained and/or stiffened state.
  • the stiffening and / or compression of the core can negatively affect the playability of the ball game racket.
  • the relatively high rigidity of the core caused at least in certain areas, especially in the areas of the core close to the hose, can have a negative effect on ball control in the stiffened areas and generally in the edge area of the ball game racket.
  • the resulting relatively high non-uniformity in the stiffness of the core which can increase in particular due to the above-described tension through the tube to the edge of the core, impair the playability of the ball game racket.
  • an elastic deformability and/or elastic restoring movement of the hose 24 in this composite material-free area 32 can also be made possible after the composite material 30, 34 has cured.
  • stiffening and/or tensioning of the core 18 by the tube 24 can be prevented or at least reduced in order to achieve a softer structure and/or greater elastic deformability, especially in the edge area, of the ball game racket 10 .
  • the playability of the ball game racket 10, in particular in the edge area of the ball game racket 10, can be improved.
  • FIG. 3 shows a ball game racket 110 according to the invention according to a further embodiment.
  • the ball game racket 110 can essentially like the ball game racket 10 from 1 and 2 be constructed.
  • the ball game racket 110 according to in 3 The embodiment shown has two additional hoses 125, which each extend through the handle section 12 and from the handle section 12 only in certain areas into the head section 14 and end there in each case.
  • the two additional hoses 125 extend in different directions from the handle portion 12 into the head portion 14.
  • hoses 24, 125 By providing a large number of hoses 24, 125, different areas of the ball game racket 110 can each be individually equipped with their own hose. For example, different hoses 24, 125, for example made of different materials and/or with different geometries, can be used. As an alternative or in addition, the hoses 24, 125 can be individually charged with a respective gas pressure during the hose blow molding process. For example, the hoses 24, 125 can be subjected to different gas pressures and/or different courses of compressed gas application and/or different compressed gas application profiles. Alternatively or additionally, the hoses 24, 125 can be charged with compressed gas at least partially one after the other, i.e. at different times.
  • the loading of the cavity 28 of the first tube 24 with the first overpressure can begin. Subsequently, i.e. with a time delay after the beginning of the loading of the cavity 28 of the first hose 24, preferably by 2 to 30 seconds, the cavity 28 of at least one of the additional hoses 125 can be subjected to the second overpressure.
  • areas of the ball game racket 110 can be designed individually, for example with different rigidities and/or different elastic deformabilities and/or different elastic restoring properties.
  • the additional hoses 125 are only shown schematically as solid lines in 3 shown.
  • the additional hoses 125 can have essentially the same, or at least a similar, construction as the hose 24 from FIGS 1 and 2 exhibit.
  • the additional hoses 125 may each have a peripheral wall 26 and a cavity 28 defined within the peripheral wall 26 .
  • the cavity 28 preferably extends over the entire length of the respective hose 125.
  • the additional hoses 125 can be completely covered or wrapped with a composite material 30 , in particular since the additional hoses 125 only extend into the head section 14 in certain areas. As a result, the additional hoses 125 have little or no influence on the Stiffness in the head section 14.
  • the additional tubes 125 can be completely covered or wrapped with composite material 30 over its circumference in order to bring about a relatively high stiffness in the handle section 12 and a comparatively lower stiffness in the head section 14 through the additional tubes 125.
  • the additional hoses 125 can also only be partially covered or wrapped with composite material 30 .
  • FIGS 1 and 2 show a ball game racket 210 according to the invention according to a further embodiment.
  • the ball game racket 210 can essentially like the ball game racket 10 from FIGS 1 and 2 be constructed.
  • the ball game racket 210 according to in 4 has a tube 124 that extends around the entire rim 22 of the core 18 forming a loop that surrounds the core 18 .
  • FIG 5 shows a ball game racket 310 according to the invention according to a further embodiment.
  • Ball game racquet 310 is substantially like ball game racquet 210 4 built up.
  • the embodiment shown has two additional hoses 125, which each extend through the handle section 12 and from the handle section 12 only in certain areas into the head section 14 and end there in each case.
  • the two additional hoses 125 extend in different directions from the handle portion 12 into the head portion 14 .
  • the additional hoses 125 can be completely covered or wrapped with a composite material 30 , in particular since the additional hoses 125 only extend into the head section 14 in certain areas. Therefore, the additional hoses 125 have little or no influence on the rigidity in the head section 14 additional hoses 125 to bring about a relatively high rigidity in the handle section 12 and a comparatively lower rigidity in the head section 14 .
  • the additional hoses 125 can also only be partially covered or wrapped with composite material 30 .
EP21198651.8A 2021-09-23 2021-09-23 Raquette de jeu de balle et procédé de fabrication d'une raquette de jeu de balle Pending EP4154950A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21198651.8A EP4154950A1 (fr) 2021-09-23 2021-09-23 Raquette de jeu de balle et procédé de fabrication d'une raquette de jeu de balle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21198651.8A EP4154950A1 (fr) 2021-09-23 2021-09-23 Raquette de jeu de balle et procédé de fabrication d'une raquette de jeu de balle

Publications (1)

Publication Number Publication Date
EP4154950A1 true EP4154950A1 (fr) 2023-03-29

Family

ID=78086209

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21198651.8A Pending EP4154950A1 (fr) 2021-09-23 2021-09-23 Raquette de jeu de balle et procédé de fabrication d'une raquette de jeu de balle

Country Status (1)

Country Link
EP (1) EP4154950A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3026016A1 (fr) 2014-09-23 2016-03-25 Decathlon Sa Raquette pour jeu de balles, et procede correspondant
FR3038844A1 (fr) * 2015-07-13 2017-01-20 Rossignol Sa Raquette, en particulier raquette de padel avec decoration
FR3042124A1 (fr) 2015-10-07 2017-04-14 Rossignol Sa Raquette, en particulier structure de raquette de padel
EP3225288A1 (fr) * 2016-03-29 2017-10-04 Skis Rossignol Raquette, en particulier structure de raquette de padel
FR3056918A1 (fr) * 2016-10-04 2018-04-06 Skis Rossignol Raquette, en particulier structure de raquette de padel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3026016A1 (fr) 2014-09-23 2016-03-25 Decathlon Sa Raquette pour jeu de balles, et procede correspondant
FR3038844A1 (fr) * 2015-07-13 2017-01-20 Rossignol Sa Raquette, en particulier raquette de padel avec decoration
FR3042124A1 (fr) 2015-10-07 2017-04-14 Rossignol Sa Raquette, en particulier structure de raquette de padel
EP3225288A1 (fr) * 2016-03-29 2017-10-04 Skis Rossignol Raquette, en particulier structure de raquette de padel
FR3056918A1 (fr) * 2016-10-04 2018-04-06 Skis Rossignol Raquette, en particulier structure de raquette de padel

Similar Documents

Publication Publication Date Title
DE69934323T2 (de) Zweiteiliger sportschläger
DE102015209795A1 (de) Ball und Verfahren zu dessen Herstellung
DE19521268A1 (de) Sportball und Verfahren zu seiner Herstellung
DE2631288A1 (de) Rahmen fuer spiele-schlaeger
DE4426777A1 (de) Verfahren zum Herstellen eines Rahmens für einen Spielschläger
EP0337326A2 (fr) Poignée pour raquette de jeu de balles
DE2229920C2 (de) Verfahren zum Herstellen von Schlägerrahmen für Tennis und andere Ballspiele aus faserverstärktem Kunststoff
DE102016009720B4 (de) Griffschale für Ballspielschläger
EP4154950A1 (fr) Raquette de jeu de balle et procédé de fabrication d'une raquette de jeu de balle
DE2631345A1 (de) Tennisschlaeger in verbundbauweise und verfahren zu seiner herstellung
EP1452207A1 (fr) Raquette pour jeux de balle
EP1570883A1 (fr) Raquette pour des jeux de balle et procédés de fabrication
EP1557203B1 (fr) Raquette pour jeux de balle et méthode de fabrication
EP2062621B1 (fr) Raquette dotée d'un pont mobile
DE102004003526B3 (de) Schläger für Ballspiele und Herstellungsverfahren
EP2044982B1 (fr) Raquette de ping-pong
WO2008149183A1 (fr) Tête de crosse composite possédant une structure multi-tube
DE3715414C2 (fr)
DE3933831C1 (en) Handle for games racquet - has hollow plastics section defining two chambers
DE102005015495A1 (de) Ballspielschläger, insbesondere Tennisschläger
DE4102901A1 (de) Racket
DE2522857A1 (de) Tennisschlaeger
DE102004054190B3 (de) Ballspielschläger, insbesondere Tennisschläger
AT402363B (de) Ski-, berg-, eislauf- oder rollschuh mit einer kunststoffschale sowie verfahren zur herstellung desselben
DE4402301A1 (de) Verfahren zur Herstellung eines Hohlskis und danach hergestellter Hohlski

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20230926

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20240129