EP0055184A1 - Cadre de raquette, en particulier pour jeu de tennis, en matière synthétique polymérisée armée de fibres résistantes, et son procédé de fabrication - Google Patents

Cadre de raquette, en particulier pour jeu de tennis, en matière synthétique polymérisée armée de fibres résistantes, et son procédé de fabrication Download PDF

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Publication number
EP0055184A1
EP0055184A1 EP81402044A EP81402044A EP0055184A1 EP 0055184 A1 EP0055184 A1 EP 0055184A1 EP 81402044 A EP81402044 A EP 81402044A EP 81402044 A EP81402044 A EP 81402044A EP 0055184 A1 EP0055184 A1 EP 0055184A1
Authority
EP
European Patent Office
Prior art keywords
fibers
panels
frame
resistant
rope
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81402044A
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German (de)
English (en)
French (fr)
Inventor
Michel Guyot
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0055184A1 publication Critical patent/EP0055184A1/fr
Withdrawn legal-status Critical Current

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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
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B49/10—Frames made of non-metallic materials, other than wood
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B49/10—Frames made of non-metallic materials, other than wood
    • A63B49/11—Frames made of non-metallic materials, other than wood with inflatable tubes, e.g. inflatable during fabrication
    • 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
    • A63B2209/023—Long, oriented fibres, e.g. wound filaments, woven fabrics, mats
    • 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

Definitions

  • the present invention relates first of all to a racket frame, in particular for tennis game, made of polymerized synthetic material reinforced with resistant fibers, and more particularly a frame of the type with a resistant structure essentially in a box, with or without internal reinforcement ribs.
  • this frame being of the general type comprising a basket intended to receive a taut rope, and a handle connected to the basket by an intermediate part or core.
  • essentially box-like resistant structure is meant to indicate that the resistant part of the racket frame structure is hollow, that is to say tubular, with or without internal reinforcing ribs.
  • the resistant fibers do not have the optimal direction at any point of the frame.
  • the braided sheaths are made of fibers which always have the same orientation relative to the general axis of the sheath; when they cross at 90 °, they make an angle of 45 ° with respect to said axis.
  • this axis follows exactly the shape of the contour of the racket, and therefore follows an oval course in the part constituting the basket, and a course also curved, concave, in the intermediate part connecting this basket to the handle, which constitutes the only straight part.
  • One of the aims of the invention is to remedy these drawbacks of known snowshoes, and to control, to a large extent, the orientation of the fibers in the different areas of the frame.
  • the object of the present invention is also to obtain a simplified manufacturing process, allowing production in large series and at lower cost; it is also, in general, to obtain rackets, in particular for tennis, which have qualities of mechanical resistance notably increased, without increase in weight, and which make it possible to obtain a better striking of the ball, with greater accuracy of the trajectory, as well as a reduction in vibrations and fatigue of the player.
  • the faces or sides of the box constituting the resistant structure by cutting panels or strips of suitable shapes from a sheet of resistant prepreg fibers. It will then suffice to position these panels or bands in the mold to constitute the hollow resistant structure, around inflatable tubes, then to implement the known operations of inflating said tubes, then of polymerization, with however the economy of the operation. for introducing synthetic material into the mold.
  • panels are meant above all to designate parts cut from a sheet of fibers, and which may have a particular shape, for example substantially the shape, seen in plan, of a racket. or a part of a tennis racket, these panels therefore being intended to constitute, in whole or in part, the upper and lower faces of the racket, parallel to the plane of the string.
  • bands is intended to denote above all elements with parallel edges, of fibers -woven or not more particularly intended to constitute the edges or sides of the racket, that is to say to extend, according to the sides of the cabinet, perpendicularly to said panels; these strips can also be cut from sheets of pre-impregnated fibers, or be made up properly of strips delivered as is, therefore precut. With such bands, we can anyway also perform on the edges of the frame, and in the most stressed places, localized thicknesses.
  • a racket frame according to the invention can therefore be essentially characterized in that at least its two flat faces parallel to the plane of the rope were made from panels of strong prepreg fibers, cut from sheets of such fibers and which, after polymerization and finishing, are connected without solution of continuity to the lateral sides or edges of said structure.
  • edges of said structure were formed from narrow plies or strips of resistant prepreg fibers, or from strip-shaped panels cut from plies of such fibers.
  • Such a frame can also be distinguished in that the panels and / or strips of fibers are arranged in several layers.
  • Some of said layers, at determined locations in the structure, may only extend along part of it, the structure thus being with localized reinforcements.
  • These reinforcements will in principle be located in particular in said intermediate part between the basket and the handle and possibly at the top of the basket and towards the free end of the handle, locations which are usually the most stressed during the game.
  • the frame comprises, as resistant fibers, unidirectional fibers, in particular as regards said faces parallel to the plane of the rope. It will then be particularly appropriate to ensure, at the time of cutting, that said faces parallel to the plane of the rope comprise panels of strong unidirectional fibers parallel to the axis of the handle (general axis of the frame).
  • the side edges or sides of the resistant box structure may also be made for the side edges or sides of the resistant box structure to have unidirectional resistant fiber bands or panels extending in planes parallel to said plane of the rope. .
  • This arrangement is also extremely advantageous, in that it gives the racket frame, in particular the oval or basket part, a very high rigidity with respect to static (tension of the rope) and dynamic (vibrations to the impact of the balls), in the plane of the rope, along the two main axes of the basket, as a result of the hoop effect, exerted by the continuous fibers of the edges, along the entire periphery of the frame. Again, all the fibers work in the optimal direction. This will give you a racket whose contractions during the game and alternative basket elongations, in the plane of the rope, will be considerably reduced, which will reduce the amplitude of the vibrations of the rope, therefore will increase the speed of the balls, and will give them a more precise trajectory.
  • edges of the structure comprise strips or panels of resistant woven fibers extending at an angle of ⁇ 45 °, or of a similar value, relative to the plane of the rope.
  • the woven fibers of the cut panels and constituting the faces of the frame parallel to the plane of the rope may have a constant direction, independent of their position in the frame.
  • the plies of resistant prepreg fibers 1 and 2 shown respectively in FIGS. 1 and 2 can be single plies, but preferably are to be considered as the top ply of a pile containing a certain number of layers, for example of the order of several units or several tens, the cutting tool, of the cookie cutter type or of any other type, then being suitable for making cuts at once over the entire height of said stack.
  • the cutting tool of the cookie cutter type or of any other type
  • the lines of the various panels or bands which are intended to be cut from a stack of plies of resistant fibers, for example carbon fibers, prepreg of a synthetic material, have been represented by lines in dashed lines. heat-polymerizable, for example of the epoxy resin type, said fibers being unidirectional.
  • contours of panels intended to constitute, over their entire surface, part of the thickness of the upper and lower faces of the resistant box-shaped structure of a snowshoe frame is thus referenced in 3.
  • contours 3 (axis of the handle) being oriented exactly in the direction of the unidirectional fibers which, in order not to overload the design, are represented, in the sheet, only in certain locations, such as 4.
  • contours 5 and 7 are intended to constitute a reinforcement panel for the lower part of the basket and the intermediate part between the latter and the handle, that the contour 6 is intended for constituting a reinforcement panel, only of this intermediate part, and that the contour 7 is intended to constitute a reinforcement panel for the top of the basket.
  • contours 5 to 7 also have a general orientation coinciding with the direction of the unidirectional fibers 4.
  • a frame produced from such panels and strips all cut so that their general orientation co-coincides with the direction of the fibers, will have the advantage of requiring only very reduced finishing operations, given that said fibers, of this done, connect extremely well, without a solution of continuity, according to the different edges of the frame, namely at the junction between the edges and the surfaces parallel to the plane of the rope; deburring operations can therefore be, if not eliminated, at least reduced to a strict minimum.
  • FIG. 3 various panels have been shown on a larger scale, referenced 3a, 5a, 6a and 7a cut from a sheet of unidirectional prepreg fibers 1 according to the contours respectively referenced in this last figure in 3, 5, 6 and 7.
  • FIG. 4 shows in profile how these various panels 3a to 7a can be superimposed, to constitute, on the one hand the upper face of the frame and, on the other hand, its lower face. These different panels are shown on either side of a central part 11 which diagrams the hollow internal space of the box.
  • Reinforcement strips 9a are also provided, superimposed on the main strip 8a inside the basket 14, in particular to reinforce the top of the basket and its opposite part, which is located near the. heart 15, and finally, as regards, according to the exemplary embodiment shown, the production of a racket with a hollowed-out heart (reference 16), reference is also made to 9a a band constituting the inner edge of the song of the hollow heart 15.
  • FIG 6 there is shown schematically and partially a mold for shaping and polymerization of a frame, in particular for tennis rackets, produced in accordance with the invention.
  • a bottom plate of the mold in 18 a middle plate for lateral closure, in 19 a removable core (positioning pins 20) corresponding to the internal shape of the racket basket, and in 21 a also removable core (positioning pins 22) corresponding to the hollowed out part of the heart of the racket (of course, this core is not necessary when it is desired to make a racket with a full heart).
  • the cores 19 and 21 are put in place on the bottom plate 17, the corresponding bands 8a and 9a are applied to the edges 23 of these cores, for example according to the type of configuration shown in FIG. 5, then similarly in place the median lateral closure plates 18 and the edges 24 are applied other bands 8a and 9a, intended to constitute the outer edges of the frame also, for example, according to the configuration of FIG. 5.
  • the inflatable tubes can then be placed in the mold housing thus formed.
  • This is for example a first inflatable tube 25 starting from the end of the mold housing which corresponds to the end of the handle of the racket, which goes around the core 21 and then returns to this same end of the mold; it is also a second inflatable tube 26 likewise starting from the end in question of the mold housing, going around the core 19 and also returning towards this same end.
  • the parts of the first tube 25 which extend along the handle of the racket are thus placed between the corresponding parts of the second tube 26.
  • the panels 3a, 5a, 6a and 7a intended to constitute the upper face of the frame are put in place, superimposed as shown in FIG. 4, after which the mold can be closed by means of a closing plate 27 , then proceed to inflate the tubes 25 and 26, which plates the various panels and edges of resistant fibers impregnated against the walls of the mold, and finally proceed to the polymerization of the reinforced synthetic material, by heating the mold.
  • the inflation of the tubes allows said panels and strips to be pressed perfectly against the walls of the mold, since these panels and strips are free to move slightly relative to one another.
  • the width of the prepreg fibers can also be provided slightly greater than that of the edges of the racket frame, which allows the edges to be folded inwards, between said panels 29
  • Such bands have been generally referenced at 30 in FIG. 7 and their edges folded at 31. It should be emphasized that the increase in width of the panels and bands has been deliberately exaggerated in this figure to make this arrangement clearer. . In order not to complicate the drawing, we have not drawn the grooves such as 28 which can also include the edges of the cores 19 and 21.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Moulding By Coating Moulds (AREA)
  • Laminated Bodies (AREA)
EP81402044A 1980-12-22 1981-12-21 Cadre de raquette, en particulier pour jeu de tennis, en matière synthétique polymérisée armée de fibres résistantes, et son procédé de fabrication Withdrawn EP0055184A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8027255A FR2496470A1 (fr) 1980-12-22 1980-12-22 Cadre de raquette, en particulier pour jeu de tennis, en matiere synthetique polymerisee armee de fibres resistantes, et son procede de fabrication
FR8027255 1980-12-22

Publications (1)

Publication Number Publication Date
EP0055184A1 true EP0055184A1 (fr) 1982-06-30

Family

ID=9249366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81402044A Withdrawn EP0055184A1 (fr) 1980-12-22 1981-12-21 Cadre de raquette, en particulier pour jeu de tennis, en matière synthétique polymérisée armée de fibres résistantes, et son procédé de fabrication

Country Status (2)

Country Link
EP (1) EP0055184A1 (enrdf_load_stackoverflow)
FR (1) FR2496470A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077134A1 (en) * 1981-10-09 1983-04-20 Kun Nan Lo Method for making fiber sheet reinforced wood racket
FR2592804A1 (fr) * 1986-01-13 1987-07-17 Rossignol Sa Raquette de tennis en materiau stratifie

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2190018A5 (enrdf_load_stackoverflow) * 1972-06-20 1974-01-25 Kicherer Karl H Inz
US3993308A (en) * 1968-01-08 1976-11-23 Jenks Herbert R Laminated fiberglass tennis racket
US4031181A (en) * 1972-04-05 1977-06-21 General Dynamics Corporation Method for molding high strength facing
FR2447800A1 (fr) * 1979-02-05 1980-08-29 Westland Aircraft Ltd Procede pour produire des objets creux en une matiere plastique renforcee de fibres et objets creux ainsi obtenus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993308A (en) * 1968-01-08 1976-11-23 Jenks Herbert R Laminated fiberglass tennis racket
US4031181A (en) * 1972-04-05 1977-06-21 General Dynamics Corporation Method for molding high strength facing
FR2190018A5 (enrdf_load_stackoverflow) * 1972-06-20 1974-01-25 Kicherer Karl H Inz
FR2447800A1 (fr) * 1979-02-05 1980-08-29 Westland Aircraft Ltd Procede pour produire des objets creux en une matiere plastique renforcee de fibres et objets creux ainsi obtenus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077134A1 (en) * 1981-10-09 1983-04-20 Kun Nan Lo Method for making fiber sheet reinforced wood racket
FR2592804A1 (fr) * 1986-01-13 1987-07-17 Rossignol Sa Raquette de tennis en materiau stratifie
EP0233128A1 (fr) * 1986-01-13 1987-08-19 Skis Rossignol S.A. Raquette de tennis en matériau stratifié

Also Published As

Publication number Publication date
FR2496470B1 (enrdf_load_stackoverflow) 1984-06-22
FR2496470A1 (fr) 1982-06-25

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