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EP4154950B1 - Ballspielschläger und verfahren zum herstellen eines ballspielschlägers - Google Patents

Ballspielschläger und verfahren zum herstellen eines ballspielschlägers Download PDF

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Publication number
EP4154950B1
EP4154950B1 EP21198651.8A EP21198651A EP4154950B1 EP 4154950 B1 EP4154950 B1 EP 4154950B1 EP 21198651 A EP21198651 A EP 21198651A EP 4154950 B1 EP4154950 B1 EP 4154950B1
Authority
EP
European Patent Office
Prior art keywords
tube
ball game
core
partially
composite material
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.)
Active
Application number
EP21198651.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP4154950A1 (de
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 ES21198651T priority Critical patent/ES2988555T3/es
Priority to EP21198651.8A priority patent/EP4154950B1/de
Publication of EP4154950A1 publication Critical patent/EP4154950A1/de
Application granted granted Critical
Publication of EP4154950B1 publication Critical patent/EP4154950B1/de
Active 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
    • A63B59/40—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

  • padel tennis as in traditional tennis, a ball is hit over a net into the opponent's half of the court using a racket.
  • the court In contrast to traditional tennis, the court has external walls that can also be used to hit the ball into the opponent's half of the court, similar to squash.
  • the handle section can be designed 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 object.
  • 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 a slip-reducing surface that can prevent or at least reduce slipping of the handle section in the user's hand.
  • 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 partially through the handle section and the head section.
  • the handle section and the head section can be separate components that can then be connected to one another, for example by gluing, welding, or other joining methods.
  • the tube 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 circumference of the edge of the core.
  • Ball game rackets that have a tube that partially extends through the respective frame are usually manufactured using a so-called tube blowing process.
  • the ball game racket described here can also be manufactured using the tube blowing process.
  • the tube In the tube blowing process, the tube is usually either made 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 process are described, for example, in the aforementioned FR 3 042 124 A1 described.
  • the hose usually has openings at both ends that 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 compressed gas, preferably a source of compressed air.
  • the stiffening and/or compression of the core, particularly in the areas of the core close to the hose, by the hose can have a negative effect on the playability of the ball game racket.
  • the relatively high stiffness of the core caused at least in some areas, especially in the areas of the core close to the tube can have a negative effect on ball control in the stiffened areas and generally in the edge area of the ball game racket.
  • the relatively high unevenness of the stiffness of the core caused by this which can increase in particular due to the tension described above through the tube to the edge of the core, can impair the playability of the ball game racket.
  • edge area of the ball game racket is a relatively large distance from the handle section compared to areas that are closer to the center of the respective hitting surface, an impact of the ball on the edge area of the ball game racket can transfer relatively large forces and/or moments to the hand and/or arm of the user, which can cause an increased risk of injury and/or a deterioration in the comfort of the ball game racket.
  • These effects can be promoted 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, which can reduce the risk of injury and increase the comfort of the ball game racket.
  • the composite-free region of the first tube facing the edge of the core can, when the ball game racket is ready for use, at least partially rest against the edge of the core.
  • a gap preferably an air gap
  • a cavity is therefore arranged between the edge of the core and the composite-free region of the first tube, with neither part of the tube nor part of the core being arranged in this cavity.
  • the rigidity in the edge region of the ball game racket can be further reduced in order to further improve the playability of the ball game racket.
  • the entire composite-free area of the first tube and the edge of the core are non-contacting with each other.
  • tubeless ball game rackets have largely prevailed over ball game rackets with a surrounding tube in recent years.
  • the configuration of the ball game racket with a tube described here has advantages over tubeless ball game rackets, for example compared to the configuration mentioned at the beginning.
  • FR 3 026 016 A1 described ball game rackets surprisingly have advantages. For example, a smaller core can be used compared to tubeless ball game rackets, since the tube replaces part of the core in the edge area of the ball game racket.
  • the weight of the ball game racket can be reduced compared to tubeless ball game rackets with the same or at least similar dimensions.
  • the material weight saved as a result, especially in the edge area of the ball game racket, can be used or employed elsewhere.
  • the edge area of the ball game racket can be made more robust, for example by providing thicker material thicknesses and/or additional material. This can increase the robustness of the ball game racket, especially in the edge area of the same.
  • the ball game rackets used can relatively frequently be exposed to high loads, for example due to the ball game rackets accidentally hitting wall structures that border the playing field in padel tennis.
  • a robust design of the ball game racket, especially the edge area can increase the service life of the ball game racket.
  • a more flexible and/or more precise design of the edge of the head section of the ball game racket can be made possible compared to tubeless ball game rackets.
  • the shape and/or geometry of the frame can be varied in a reliable, flexible and relatively simple manner. Designing the edge of the head section in tubeless ball game rackets, where the core extends essentially to the edge of the respective ball game racket, is much more complex and/or has less design freedom. For example, the edge of the core must be cut out relatively precisely in order to achieve the desired contour and/or geometry of the edge of the core.
  • the tube blowing process for producing a ball game racket equipped with a tube can achieve a higher quality and/or fatigue strength when using a composite material compared to the manufacturing process for a tubeless ball game racket.
  • the individual layers of the composite material can be compressed more strongly when the tube is subjected to compressed gas than in the manufacturing process for a tubeless ball game racket. This can increase the quality and/or durability of the ball game racket.
  • the ball game racket described herein may be particularly suitable for padel tennis. However, the ball game racket may also be suitable for other sports and/or leisure activities in which a ball game racket is used.
  • substantially 10% to 50%, preferably 10% to 40%, more preferably 10% to 30%, most preferably 15% to 30%, of an outer circumference of the first tube is free of composite material.
  • These value ranges can enable elastic deformation and/or elastic recovery of the tube in the composite material-free region in order to prevent or at least reduce stiffening and/or tensioning of the core by the tube. This can increase the playability of the ball game racket, particularly in the edge region of the ball game racket.
  • the composite material extends, at least in the region of the first tube extending along at least a region of the edge of the core, 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.
  • the gap has a gap width extending from the core to the outside of the first tube of 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 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 0.5 mm to 1 mm.
  • the first tube extends at least partially through the frame and the handle section.
  • the first tube is only partially covered with a composite material along its entire extension through the frame and the handle section.
  • only the section of the tube that extends through the frame can be partially covered with a composite material such 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 section of the tube that extends through the handle section can be completely covered with a composite material.
  • the composite material can have a higher stiffening effect in the handle section than in the frame.
  • the first tube in the head section extends around the entire edge of the core. This allows essentially the entire contour of the striking surfaces to be formed by the tube, thereby increasing the stability of the core and the striking surfaces can be increased.
  • the entire section of the tube which extends around the edge of the core is partially covered with a composite material such 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 entire region 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 hose that extends at least partially through the head section and/or through the handle 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 pressurized with a respective gas pressure.
  • the hoses can be pressurized with different gas pressures and/or with different courses and/or different profiles of the pressurized gas application. In this way, 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.
  • the additional hose extends at least partially through the handle section and from the handle section only partially into the head section and ends there.
  • the ball game racket has at least two additional tubes, each of which extends at least partially through the head section and/or through the handle section.
  • the core is made at least partially, preferably completely, from a foam.
  • the composite material is a fiber-plastic composite, preferably a carbon fiber-reinforced and/or glass fiber-reinforced plastic.
  • the coating has at least one layer made of a composite material, preferably of a fiber-plastic composite, preferably of a carbon fiber-reinforced and/or glass fiber-reinforced plastic.
  • the handle section and/or the head section preferably in a fork region of the ball game racket, has an expandable material, preferably an expanded polystyrene (EPS), which is designed to expand by activation, preferably by supplying heat.
  • EPS expanded polystyrene
  • the expandable material can additionally cause a pressing and/or compaction of composite materials by the expandable material expanding in a targeted manner during the manufacture of the ball game racket and pressing the composite material against the corresponding heatable mold during the tube blow molding process. This can increase the stability and durability of the ball game racket.
  • the tube in the composite-free region can at least partially return from the expanded state caused by the pressurized gas exposure to the non-expanded state due to the intrinsic elastic recovery force of the tube after the pressurized gas exposure of the hollow space of the tube has at least partially ended when the composite-reinforced tube has hardened.
  • the gap has a gap width extending from the core to the outside of the first tube of 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 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 0.5 mm to 1 mm.
  • 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 handle portion of the ball game racket.
  • the outside of the first tube is partially coated with a composite material such that the entire area of the outside of the tube facing the core is free of composite material.
  • the core is made at least partially, preferably completely, from a foam.
  • the variation of the overpressure can, for example, also be carried out simultaneously and/or at different times together with variable heat generation in a heatable mold into which the hose 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.
  • a pulsating overpressure This allows the properties of the ball game racket, for example its rigidity and/or elastic deformability and/or elastic recovery capacity, to be optimized or specifically changed. Desired and/or predefined properties of the ball game racket can be achieved 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 heat generation in a heatable mold into which the tube can be inserted at least before step f).
  • the cavity of the first tube is subjected to a, preferably predetermined, profile of an at least temporarily inconstant pressure curve over a pressurization time.
  • the cavity of the first hose is subjected to a first overpressure and the cavity of the one additional hose or the cavities of the at least two additional hoses are each subjected to a second overpressure.
  • the first overpressure and the second overpressure are preferably different.
  • the cavity of the first hose is subjected to a first overpressure of 2 bar to 5 bar and the cavity of the 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 subjected to a higher overpressure than the first hose. This allows a relatively high rigidity to be achieved in the handle section, while the rigidity and a pressing force caused by the expansion of the first hose in the head section, at least around the core, can be limited or reduced.
  • the cavity of the one additional hose or the cavities of the two additional hoses are subjected to the second overpressure and the cavity of the first hose is subjected to the first overpressure at least partially at different times.
  • the first hose and the two additional hoses can be arranged in the ball game racket in such a way that at least two of the hoses extend through the ball game racket, partially overlapping or at least substantially adjacent to one another.
  • the ball game racket 10 has a transition area 23 that connects the handle 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 racket 10 also has a first tube 24 which extends through the frame 16 along a portion of the edge 22 of the core 18.
  • the tube 24 is only shown schematically as a solid line in Fig.1 shown. In Fig.2 the hose 24 is shown in more detail.
  • the first tube 24 has a circumferential wall 26 and a cavity 28 defined within the circumferential 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, an elliptical, a triangular or a polygonal cross-sectional shape.
  • the cross-sectional shape of the hose 24 formed in the ball game racket 10 depends essentially on the geometry of a mold in which the ball game racket 10 is pressed and cured in a hose blow molding process. The hose blow molding process is described in more detail below.
  • the tube 24 is partially covered with a composite material 30 such that at least a region 32 of an outer side of the tube 24 facing the edge 22 of the core 18 is free of composite material.
  • the composite-reinforced hose When the hollow space of the hose is subjected to a pressurized gas, the composite-reinforced hose is expanded, whereby the hose presses against the core arranged at least partially within the hose and thereby at least partially tensions and/or compresses it.
  • the hose completely wrapped with composite material or made entirely of composite material hardens, the hose solidifies in this expanded position, whereby in previously known ball game rackets the core and the hose remain essentially in a tensioned and/or stiffened state even after the hose has been subjected to pressurized gas and after the ball game racket has been removed from the mold.
  • Fig.4 shows a ball game racket 210 according to the invention according to a further embodiment.
  • the ball game racket 210 can essentially be designed like the ball game racket 10 from the Fig.1 and 2
  • the ball game racket 210 has, according to the Fig.4
  • the embodiment shown in FIG. 1 has a tube 124 which extends around the entire edge 22 of the core 18 and thereby forms a loop which surrounds the core 18.
  • the area in Fig.1 shown tube 24 only around a portion of the edge 22 of the core 18.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Laminated Bodies (AREA)
EP21198651.8A 2021-09-23 2021-09-23 Ballspielschläger und verfahren zum herstellen eines ballspielschlägers Active EP4154950B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES21198651T ES2988555T3 (es) 2021-09-23 2021-09-23 Raqueta de juego de pelota y procedimiento para fabricar una raqueta de juego de pelota
EP21198651.8A EP4154950B1 (de) 2021-09-23 2021-09-23 Ballspielschläger und verfahren zum herstellen eines ballspielschlägers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21198651.8A EP4154950B1 (de) 2021-09-23 2021-09-23 Ballspielschläger und verfahren zum herstellen eines ballspielschlägers

Publications (2)

Publication Number Publication Date
EP4154950A1 EP4154950A1 (de) 2023-03-29
EP4154950B1 true EP4154950B1 (de) 2024-07-03

Family

ID=78086209

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21198651.8A Active EP4154950B1 (de) 2021-09-23 2021-09-23 Ballspielschläger und verfahren zum herstellen eines ballspielschlägers

Country Status (2)

Country Link
EP (1) EP4154950B1 (es)
ES (1) ES2988555T3 (es)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3026016B1 (fr) 2014-09-23 2018-03-16 Decathlon Sa Raquette pour jeu de balles, et procede correspondant
FR3038844B1 (fr) * 2015-07-13 2018-07-27 Rossignol Sa Raquette, en particulier raquette de padel avec decoration
FR3042124B1 (fr) 2015-10-07 2018-04-06 Skis Rossignol Raquette, en particulier structure de raquette de padel
FR3049469B1 (fr) * 2016-03-29 2018-04-06 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

Also Published As

Publication number Publication date
EP4154950A1 (de) 2023-03-29
ES2988555T3 (es) 2024-11-21

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