EP0701844A2 - Tischtennisschläger mit einer differenzierten Struktur - Google Patents

Tischtennisschläger mit einer differenzierten Struktur Download PDF

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Publication number
EP0701844A2
EP0701844A2 EP95114289A EP95114289A EP0701844A2 EP 0701844 A2 EP0701844 A2 EP 0701844A2 EP 95114289 A EP95114289 A EP 95114289A EP 95114289 A EP95114289 A EP 95114289A EP 0701844 A2 EP0701844 A2 EP 0701844A2
Authority
EP
European Patent Office
Prior art keywords
blade
handle
bat according
bat
central part
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Withdrawn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
EP95114289A
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English (en)
French (fr)
Other versions
EP0701844A3 (de
Inventor
Umberto Fassio
Francesco Cozzo
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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
Priority claimed from ITMI941877A external-priority patent/IT1274768B/it
Priority claimed from ITMI942054A external-priority patent/IT1271252B/it
Priority claimed from IT94MI002515A external-priority patent/ITMI942515A1/it
Priority claimed from IT95CN000010 external-priority patent/IT1281563B1/it
Application filed by Individual filed Critical Individual
Publication of EP0701844A2 publication Critical patent/EP0701844A2/de
Publication of EP0701844A3 publication Critical patent/EP0701844A3/de
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/06—Handles
    • A63B60/10—Handles with means for indicating correct holding positions
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/16—Table 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
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/06—Handles
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/06—Handles
    • A63B60/08—Handles characterised by the material
    • 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

  • This invention relates to a table tennis bat having a differentiated structure bat, particularly suitable for sporting games and competitions, such as to impart the equipment particular characteristics of reaction and bounce following the ball impact, so that the user can react promptly and in an appropriate manner to the various types of stresses.
  • table tennis bats are realized by cutting out from a multilayer plywood made from different woods, a flat and uniform shaped piece which is then fastened by glueing to a handle, which is also realized, in the most precious types, from multilayer wood.
  • a handle which is also realized, in the most precious types, from multilayer wood.
  • Such structure is normally called frame, while the flat shaped portion is called blade.
  • one or more layers constituting the slab from which the blade is obtained are realized from materials other than wood, such as glass, carbon, kevlar fibres or mixed fibres, impregnated with resin.
  • a layer of variously constituted rubber is glued on both faces of the blade, which rubber has the function of elastic intermediate layer during the impact between ball and frame.
  • the basic construction and realization characteristics according to the known art are constituted by the fact that said blade is always made from solid and relatively heavy wood layers. Such layers, which are almost always no less than five, are so arranged that the fibres have crossing directions, with the purpose of obtaining a blade with a stiff loadbearing structure almost isotropic in all directions.
  • the definitions measure quantitatively the scale of the bounce in the return stroke characterized by a given relative ball-blade impact.
  • the bats according to the known art show the so-called "edge effect”, ascribable to the structural characteristics of the blade, caused by the presence in the blade of an ideal band around the edge, on which the bounce is strongly dampened and in some points even non existent, which causes a completely unpredictable behaviour of the bat.
  • the factors determinating the quality of the return strokes are, in order of importance, and obviously besides the skill of the players, the type of adhesive glue between the rubber and the blade, the nature of the rubber, the structure of the blade and lastly, with an almost negligible effect, the structure of the handle.
  • the shape and the materials utilized for the handle are chosen with the sole purpose of easing the use of the equipment and of stiffening the frame as a whole, and therefore the bat.
  • the basic element characteristic of the bat handles according to the known art besides ergonomics, lies therefore in that they have a high and almost uniform bending stiffness around each main inertia axis (XYZ axes of Fig. 14).
  • a very frequent and effective return stroke consists in that the ball is spin-striken with great energy, and accompanied for a short length by an oblique movement of the hand which holds the bat.
  • This movement causing an effect of tangential stroke on the ball, causes the latter to quickly rotate on itself and the trajectory becomes a wide parabola which ends in the opposed field, where said ball which still retains much of the initial rotatory effect, rebounds in an unforeseeable direction.
  • the effectiveness of this strole is such that it is often conclusive.
  • Object of this invention is to provide a table tennis bat having the capacity of causing the ball to bounce in a quantitative constant manner on a wide surface of the blade and with the utmost bounce uniformity, both in the middle and in the zone near the periphery of said blade, ensuring therefore the return stroke a high reliability and certainty.
  • Another object of this invention is to provide and put at disposal a table tennis bat having at the same time high control characteristics, namely dampening capacity in the impact relative middle-velocity return strokes, and velocity characteristics, namely ball acceleration capacity in the impact relative high velocity of return strokes.
  • Still a further object of the invention is to provide a table tennis bat realized according to the type of play and in particular the type of return stroke the user wishes to perform.
  • a further object of the invention is to provide and put at disposal a table tennis bat substantially free from "edge effect", i.e. from zones on which the ball bounce is dampened and/or nonexistent.
  • Object of this invention is to provide a table tennis bat constituted by a frame whose shape is determinant for the performances obtained in the return strokes with spin movement of the types called spin or top spin strokes, as it can impart the ball a high rotation.
  • a further object of the invention is to provide a table tennis bat that can impart the ball wide parabolic trajectories in the strokes made with a spin movement like those called “spin” or “top spin” strokes.
  • a further object of the invention is to provide a table tennis bat which can be advantageously utilized without having to use "fresh” glues and such as to allow to achieve equivalent performances by using, instead of "fresh” glues, so-called “dry” glues, eliminating in this way also the risk for the user to breath in dangerous and or harmful solvents.
  • Object of this invention is to provide a handle for sports equipments or articles and the like, suitable to transmit the user of the equipment the stresses - such as impacts or blows against free bodies or the likes received by said equipment - suitably amplified and selected so that the user can promptly and adequaly react to said stress, according to the intensity and type of the latter.
  • a further object of this invention is to provide a handle for sports equipments and the like, suitable to select the stresses imparted to the equipment, and to transmit suitably amplified to the user only the stresses chosen according to the use for which said equipment is intended.
  • a further object of this invention is to provide a handle for sports equipments and articles capable of transmitting the user, suitably amplified and selected, the stresses imparted to the equipment, of smooth and easy use and such as not to involve complications and/or heaviness in the equipments with the related discomforts or drawbacks for the user.
  • a table tennis bat constituted substantially by a handle and a shaped portion or blade
  • the multilayer structure of the blade includes at least a layer of natural cork, so arranged and shaped as to constitute a basic element of said structure or which blade comprises a light, elastic and flexible central part or zone, and a peripheral edge heavier and stiffer compared with said central part, or wherein the frame can elastically bend following external stresses in the table plane, while it is stiff in the plane orthogonal to the plane of said blade and is such, besides, as not to undergo torsional elastic deformations relatively to its longitudinal axis or wherein the handle comprises at least a vibrating elastic element fastened to said structure and/or said handle in one or more points, and resonant with a suitable range of frequences generated by the vibrations ensuing from the stresses imparted to said structure, so as to amplify said vibrations and transmit them to said handle and therefore the user through suitable contact points.
  • the most suitable structure is constituted by a three-layer plywood wherein there are a thick core, elastic, light, homogeneous an yielding, and two external leaves from a much stiffer material having a modulus of elasticity E from 100 to 1000 times greater that that of the core.
  • the ratio of the overall thickness of the stiff layers and the overall thickness of the soft layer(s) must be comprised between 0.75 and 0.04.
  • the specific weight of the core must be as reduced as possible, lower than 200 kg/m3.
  • the stiff layers may be constituted either from synthetic fibres, such as carbon, kevlar, glass or mixed, impregnated with resin, or from thin one-layer or multilayer wood, provided they have a high modulus of elasticity (greater than or equal to 700-1200 kg/mm), or from a combination of layers from synthetic fibres and resin, such as carbon, kevlar, glass and the like, together with wood layers.
  • synthetic fibres such as carbon, kevlar, glass or mixed, impregnated with resin
  • thin one-layer or multilayer wood provided they have a high modulus of elasticity (greater than or equal to 700-1200 kg/mm), or from a combination of layers from synthetic fibres and resin, such as carbon, kevlar, glass and the like, together with wood layers.
  • four-layer structures are effective, in which, besides the above described layers, also two additional thin layers are comprised made from fibre o wood are located in the external part of the blade.
  • the soft inner layer(s) has the task of imparting elasticity to the impact with the ball, while the outermost stiffer ones have the task of imparting the necessary stiffness to the equipment.
  • the position of the layers within tha blade structure must not be one of simple alternance, but such as to cause a moment of bending transversal inertia as high as possible to said blade. This must be obtained in spite of the presence of the soft layers, and therefore the stiff layers must be arranged in the external zones of the blade, suitable spaced from one another.
  • the blades have a large area of uniform return and such as to comprise almost all the useful surface of said blade. Besides, they have a so-called two-velocity behaviour in the return strokes, namely a dampening effect in the strokes with medium-low impact energy (typical of defense strokes) and an accelerating effect in the strokes with high impact energy (typical of attack strokes).
  • the two velocities are due to the different reation to the impact of the two markedly different types of layers constituting the blade.
  • the number of layers, the overall thickness of the blade, the thicknesses of the individual resistant and yielding layers as well as the more suitable elastic characteristics of the layers according to this invention must be chosen from the aforementioned ranges of values on the basis of the results of practical play tests or comparative experimental tests and according to the functions of the desired return stroke characteristics.
  • the blade is made from a plywood constituted by three layers whose two outermost layers are from homogeneous wood - or from plywood in their turn - or alternatively the external layers are made from a fabric of carbon, kevlar, glass or mixed fibres, while the central layer is from natural cork.
  • the blade is made from a plywood constituted by five layers, whose two outermost layers are from homogeneous wood - or from plywood in their turn - while the intermediate layers are made from a fabric of carbon, kevlar, glass or mixed fibres impregnated with resin, while the central layer is from natural cork.
  • the blade is constituted by the same layers of the preceding embodiment, wherein however the external layers are now made from a fabric of impregnated synthetical fibres, while the external ones are from wood.
  • the blade is made from a plywood constituted by five layers, whose outermost layers are from homogeneous wood - or from plywood in their turn - or from a fabric of impregnated carbon, kevlar, glass or mixed fibres, while the core of the plywood is constituted by two thick layers of natural cork, with a layer from wood or synthetical fibres thinner than the adjoining layers interposed between the cork layers.
  • the blade is made from a plywood composed by more than five layers, whose outermost layers are from homogeneous wood - or from plywood in their turn - or from a fabric of impregnated carbon, kevlar, glass or mixed fibres, or some of such layers are from wood and other ones from synthetical fibres, while the core of the plywood is constituted by an individual layer from natural cork, or more than one layer is from natural cork with one or more thin layers from wood or synthetical fibres, or some layers from wood and some one from fibre fabric are interposed between the cork layers.
  • the useful area of the blade becomes therefore much larger and may comprise the whole surface of the blade, while the edge effect disappears, as the impact near the edge tends to assume a a neutral return characteristic, meaning that the bounce takes place by a ball velocity almost equal to the relative velocity before the impact.
  • the reliability of the equipment results to be better and the failure probabilities of the return stroke due to the uncertainty of the bat behaviour are strongly reduced.
  • edge and blade which, either individually or jointly, may be considered as typical to impart the bat the properties described in this invention to a remarkable extent.
  • Sb is indicatively comprised between 2% of S and 55% of S.
  • EJ the total bending stifness of the straight section of the blade (including the edge but excluding the handle) and EbJb the analogous bending stiffness of the straight section of the edge only, EbJb is indicatively comprised between 15% of EJ and 60% of EJ.
  • Pb the total weight of the blade (including the edge but excluding the handle) and Pb the weight of the edge only, Pb is indicatively comprised between 15% of P and 60% of P.
  • said blade is made from materials such as wood, plastic materials, such as polyvinyl chloride, polyurethane and the like, metals such as light alloys and the like, plastic materials reinforced with glass or carbon fibres and the like, and/or by the association of two or more of said materials different from one another.
  • said central part or zone is constituted by a constant thickness flat slab from homogeneous or composite or multilayer material
  • said peripheral edge constituted by an edge which surrounds fully or partly said central part is made from a different sfiffer material having a specific weight greater than the material of said central part, and is fastened to said central part by glueing, riveting, pressure, or the like.
  • said central part and said peripheral edge are shaped as a constant thickness flat slab, said edge being realized by means of the application of reinforcing elements in the peripheral zone suitable to sfiffen the edge, so that the inertia and elastic characteristics of said central part and said edge are different from one another.
  • said central part and said peripheral edge are made from the same material and in one only piece, said central part being provided with local lightenings an unevennesses along substantially annular and concentric lines, spaced evenly or unevenly, which concern fully or partly the external surfaces of said central part or which are substantially concentrated in the core area of said central part.
  • said central part and said peripheral edge are made from the same material and in one only piece, said central part being corrugated either on one or on both external surfaces, so that said surface has alternatively a different thickness in the radial section, or, while having a constant thickness, the straight section of said central part has not a rectangular shape.
  • said blade comprising said central part and said peripheral edge is made fron one only piece whose thickness may be evenly variable along its radial section or at times constant and at times variable.
  • said blade is made by suitably combining two or more of the above described embodiments.
  • the choice of the most suitable embodiment for the blade according to this embodiment may be performed experimentally by attempts, based on the indications provided by expert players, depending on the type of play and return stroke wished. However, such choice may be also made based on the theoretical study of the ball/blade dynamic interaction during the impact as well as through simulations based on the finished elements of the phenomenon stressing the bounce unevenness and particularly the edge effect depending on the blade construction shape.
  • the so-called “fresh” glues constitute an elastic and deformable basis that reacts yieldingly to the impact, protracting the contact time and giving then back progressively the previously accumulated energy.
  • the so-called “dry” glues being stiffer, do not perform well in this use, so that they are almost ignored in competitions.
  • the frame of the bat subject matter of this invention is so shaped as to have a bending flexibility many times (>3) lower than the analogous bending stiffness around the Y axis and the torsional stiffness around the X axis, which keep a high value, equal to that found in the bats of the known art.
  • the blade results to be elastically yielding in its plane and the relative vibratory frequency lowers proportionally. This allows an active interaction of the small elastic movements of the blade during the impact with the ball, which starts rotating in the so-called spin-strokes.
  • the impact time becomes longer as at first the movement follows in synchronism and concordantly the shifting of the ball. This is the stage of elastic accumulation of the impact energy. There follows, in a second stage, a blade movement discordant relatively to the direction of the ball, which movement, giving back energy, causes said ball to strongly rotate.
  • the frame of the bat according to this invention is so shaped that the stiffness in the Z-Y plane and around the X axis remains high and greater than the stiffness in the aforementioned X-Y plane.
  • This is necessary as some characteristics of return strokes other than the so-called spin-strokes and which depend on such stiffnesses would be severely prejudiced.
  • Such characteristics include, for instance, the return uniformity of the blade and the "velocity" of the strokes directed perpendicularly to the blade.
  • such characteristic is achieved, by way of non limitative example, by obtaining in the handle a wide through-opening, so that in a section of the latter made according to a plane parallel to Z-X, the resistant section of said handle is reduced to two high and relatively thin leaves having a constant thickness, but such that said handle shows a high deformability if it is stressed by a force parallel to the Y axis, and, on the contrary, a marked stiffness if it is stressed by a force parallel to the X axis.
  • Such handle may be realized from any material either homogeneous or made from layered composite materials from wood and/or plastic materials and/or fibres in different parts, or also from homogeneous material reinforced by metal inserts or other inserts, provided that the end result is constituted by a structure wherein the above stifnesses have a marked difference from one another.
  • the resistant part of the handle which is hold by the player and which represents the structural contrast to the forces which stress the blade, takes up a characteristic form of closed ring variously shaped, while the resulting cavity may be fully or partly filled, for ergonomic reasons, with soft materials that do not show an appraisable resistance to the bending and shear deformation in the X-Y plane, so as not to hinder the functioning of the handle and therefore the frame.
  • Said vibrating elastic element may be advantageously housed in spaces or cavities suitably obtained within said handle or located fully or partly in the external part of the handle.
  • Said vibrating elastic element may be realized from different materials and have a different shape, and be fastened to said structure and/or said handle by mechanical fastening or glueing or may be formed as an integral piece from said structure or said handle.
  • said vibrating elastic element is a device constituted by cantilever-leaves, bridge-leaves, fluids oscillating in special spaces or cavities either provided or not with vibrating walls, electric, electronic or electromagnetic units for the detection, amplification and transmission, or it may be constituted by the combination and/or association of one or more of said devices.
  • the impact of the ball on the bat gives rise within the frame of this sports equipment to vibrations that are characteristic of both the elastic properties of the impacting body and those of the impacted body; these weak vibrations propagate, mixing to one another, throughout the structure, handle comprised, and represent - excluding the sensory and optical control because of the very short times - the only source of persistent and proportional information source which user can have.
  • the device according to this invention picks up such vibrations, selects them, amplifies them and transmits them to the user, through the interface unit between the equipment and the human body.
  • such interface is constituted by the handle.
  • the player gets a strong, persistent and unequivocal sensory information on the moment and the point where the impact of the ball on the bat takes place, and acquires a marked and objective control of the stroke.
  • the player even though inexpert, reaches by a very short training the mastery of the equipment.
  • the handle according to the invention detects, amplifies and transmits in real time to the user the signal and/or the vibration caused by the impact of the ball on said bat, which signal is such as to constitute a precise information to the player on the point, time and control of the impact.
  • the table tennis bats (Figs. 1 and 2) are made up by handle 1 and blade 2. On both faces of the blade, the rubber leaves 3 and 3a for the practical utilization of the bat during the game are glued.
  • Fig. 3 shows the detail of the section of a blade constituted by three layers, whose layers 4 and 4a are made from natural wood having a high traction elasticity modulus, or from fabric from carbon, kevlar, glass or mixed fibres, impregnated with resin, while the internal layer 5, thicker than the preceding ones, is from natural cork.
  • FIG. 4 shows the detail of the section of a blade constituted by five layers, whose layers 4 and 4a are made from homogeneous natural wood or plywood or a fabric from carbon, kevlar, glass or mixed fibres impregnated with resin, layers 6 and 6a are made from homogeneous wood or plywood or a fabric from carbon, kevlar, glass of mixed fibres impregnated with resin, while the internal layer 7, thicker than the preceding ones is from natural cork.
  • layers 4 and 4a are made from homogeneous natural wood or plywood or a fabric from carbon, kevlar, glass or mixed fibres impregnated with resin
  • layers 6 and 6a are made from homogeneous wood or plywood or a fabric from carbon, kevlar, glass of mixed fibres impregnated with resin
  • the internal layer 7, thicker than the preceding ones is from natural cork.
  • FIG. 5 shows the detail of the section of a blade constituted by five layers whose layers 4 and 4a are made from homogeneous natural wood or plywood, layers 8 and 8a from natural cork, while the internal layer 9 is from homogeneous wood or plywood or a fabric of carbon, kevlar of mixed fibres impregnated with resin.
  • FIG. 6 shows the detail of the section of a blade constituted by seven layers whose layers 4 and 4a are made from homogeneous natural wood or plywood or a fabric from carbon, kevlar, glass or mixed fibres impregnated with resin, layers 10 and 10a are made from homogeneous wood or plywood or a fabric from carbon, kevlar, glass or mixed fibres impregnated with resin, while the internal layer 11, thicker than the preceding ones, is from natural cork.
  • Figs. 7 are schematically indicated, for the bat of Fig. 1 according to the known art, the uniform bounce blade zone 12, which is therefore useful and utilizable for the game, and the zone concerned by the edge effect 13, within which the bounce is uneven and casually variable from one point to another.
  • Figs. 8 and 9 show two types of bat according to this invention, wherein the central part 14 of the blade is made from a material other than the material of edge 15, which edge may take up different shapes, as shown in Fig. 10; for instance, it may have a rounded shape 15a, or it may have a substantially "H"-shaped section 15b, or a hollow parallelepiped section 15c, or a hollow rounded section 15d, etc.
  • the blade is realized by means of the association of two parts from different materials and having different elastic characteristics, namely: a central constant thickness flat part 14 made from a slab of homogeneous or composite or multilayer material, characterized by a relative lightness and flexibility, and a stiffer part from a different material, such as metal or other materials, so shaped as to constitute edge 15 surrounding the central part 14.
  • a central constant thickness flat part 14 made from a slab of homogeneous or composite or multilayer material, characterized by a relative lightness and flexibility
  • a stiffer part from a different material, such as metal or other materials, so shaped as to constitute edge 15 surrounding the central part 14.
  • Such edge 15 may have the same thickness as the blade or a different thickness.
  • peripheral edge 15 of the bat of Fig. 8 is “external” relatively to the blade, while in the bat of Fig. 9, it is “internal” to the blade.
  • the blade is made from one only piece, but so shaped that the inertia and elastic characteristics of the central zone 16 and of the edge 17 are caused to be different by the application of reinforcements 18 opportunely arranged in the peripheral zone and suitable to constitute an edge 17 stiffer than the central part 16.
  • the diversity of inertia and elastic behaviour of the two parts that constitute the blade is realized by suitably shaping the central part 19, to make it more elastic and/or lighter than edge 20.
  • Such shaping provides for the individual or joint realization of lightenings 21, 22, 23 and/or local differences in the elastic characteristics of the blade along lines having an almost annular and concentric shape 19a, 19b, 19c, evenly or unevenly spaced, which may concern in full or partly the external surfaces of blade 22, or be limited to the core zone of the blade (21 and 23), so that the latter shows only a smooth surface, or the realization of local differences of the elastic characteristics of the blade along the lines obtained as described above, by suitably corrugating (24) one or both external surfaces of the blade, so that the latter has alternatively in the radial section a different thickness or, while having a constant thickness, the straigh section of the blade is no longer rectangular.
  • the blade is made from one only piece and has inertia and elastic characteristics different between edge 25 and the central part 26, obtained by means of variations of continuous thickness along the radial section as shown in 26a and 26c, i.e. the thickness is at times constant and at times variable, as shown for instance in 26b.
  • X is the longitudinal axis of the frame
  • X-Y the plane of the blade
  • Z-X the plane orthogonal to the plane of said blade.
  • the bat according to this invention is constituted by blade 2 at one end of which handle 28 is fastened.
  • the handle In the handle there is obtained the wide through-opening or cavity 27, which goes through the X-Y plane, so that the two side parts which circumscribe the opening, substantially parallel to the longitudinal axis X, take up the shape of leaves 28a and 28b, substantially parallel to one another and to the X-Z plane.
  • the stifnesses of the handle may be furtherly differentiated by suitably shaping the outlines of the opening, for instance, as shown by Fig. 17, in an 8-shape; by inserting in the side walls of the opening stiff elements, for instance the strip-shaped elements 29 and 29a, as shown by Fig. 16, or by adopting both solutions.
  • the handle of the bat according to the invention may be also realized from any homogeneous material, for instance, as shown by Fig. 17a, or from composite or layered materials or materials provided with various inserts, as shown, always by way of example, by Figs. 17b and 17c.
  • the vibrating elastic element is constituted by leaf 30 located within cavity 31 provided in handle 32 and is cantilever-fastened within the handle by means of screws or rivets 33.
  • the vibrating elastic element is constituted by a couple of cantilever-leaves 34 and 35, fastened in special cavities 36 and 37 respectively, obtained in handle 32.
  • the vibrating elastic element is constituted by vibrating leaves 38, 38a, 38b and 38c, different from one another and resonant with different frequency ranges which provide to detecting, amplifying and transmitting vibrations distinct from one another.
  • Fig. 21 shows, in a half of the figure, a vibrating elastic element constituted by a leaf 39 fastened to structure 2 of the equipment, while the second half of the figure shows the elastic element 40 fastened, always externally to the handle, in the hollow space 41 of said handle.
  • handle 32 is hollow and the vibrating elastic elements 44 are located within cavities 42 and 43, said elements being constituted by leaf 45 associated to the bridge leaf 46, and the vibrating elastic element 47, constituted by the two leaves 48 and 49, associated to the bridge leaves 50 and 51 respectively.
  • the vibrating units instead of being realized in one only piece, are made up by several pieces, each of which either individually or jointly with the other ones, performs one or several functions of detection, amplification and transmission of said vibrations to the handle and therefore the user.
  • the vibrating elastic element is constituted by an oscillating fluid 52 which fills the cavity of handle 32 and is in touch, on the one hand with the internal wall of said handle and on the other hand with the surface of structure 2; or, according to another embodiment, the oscillating fluid 53 is kept against the internal wall of handle 32 by a vibrating membrane 54, associated to the bridge-leaf 55 fastened to structure 2 of the bat.
  • the vibrating elastic element is constituted, in an embodiment, by detector 56 applied to structure 2 of the bat and located externally to handle 32; the blow or impact signal is sent by the detector to the amplifier 57 and from here to the vibrating devices 58 in touch with the handle wall.
  • detector 59 in touch with structure 2 is located within the handle and transmits the impact signal to amplifier 60, also located within said handle, which transmits the amplified signal to transmitter 61 located externally to handle 32, directly in touch with the hand of the user.
  • the detecting, amplifying and transmitting devices are electric, electronic, electromechanical devices of a known type.
  • Fig. 25 shows, in a half of the figure, a vibrating elastic element constituted by a leaf 62 fastened to one end of the hollow handle 1 projecting towards the outside, while in the other half its shows the vibrating elastic element constituted by a leaf 63 fastened between the solid handle 64 and structure 2, projecting towards the outside.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Golf Clubs (AREA)
EP95114289A 1994-09-14 1995-09-12 Tischtennisschläger mit einer differenzierten Struktur Withdrawn EP0701844A3 (de)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
ITMI941877 1994-09-14
ITMI941877A IT1274768B (it) 1994-09-14 1994-09-14 Impugnatura per attrezzi sportivi atta a trasmettere all'utente amplificate e selezionate le sollecitazioni ricevute particolarmente adatta per racchette per tennis da tavolo e simili
ITMI942054A IT1271252B (it) 1994-10-10 1994-10-10 Racchetta per tennis-tavolo a rimbalzo uniforme e sostanzialmente esente da effetto bordo
ITMI942054 1994-10-10
IT94MI002515A ITMI942515A1 (it) 1994-12-15 1994-12-15 Racchetta da tennis-tavolo con telaio a flessibilita' differenziata ad alte prestazioni, particolarmente adatta per agonismo e simili
ITMI942515 1994-12-15
ITCN950010 1995-06-08
IT95CN000010 IT1281563B1 (it) 1995-06-08 1995-06-08 Racchetta per tennis-tavolo a rimbalzo uniforme con caratteristiche contemporanee ed in alto grado di controllo e velocita'.

Publications (2)

Publication Number Publication Date
EP0701844A2 true EP0701844A2 (de) 1996-03-20
EP0701844A3 EP0701844A3 (de) 1996-05-29

Family

ID=27452995

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114289A Withdrawn EP0701844A3 (de) 1994-09-14 1995-09-12 Tischtennisschläger mit einer differenzierten Struktur

Country Status (1)

Country Link
EP (1) EP0701844A3 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2044982A1 (de) * 2007-10-03 2009-04-08 Perseus Co. Ltd. Tischtennisschläger
FR2932390A3 (fr) * 2008-06-13 2009-12-18 Jean Remy Bouvier Raquette de tennis de table
WO2011085692A1 (zh) * 2010-01-17 2011-07-21 Liu Yong 一种握柄减震的乒乓球拍、网球拍、羽毛球拍或壁球拍
WO2012104709A1 (fr) 2011-02-02 2012-08-09 Compagnie Generale Des Etablissements Michelin Raquette de tennis de table et revêtement pour raquette
DE102022112520A1 (de) 2022-05-18 2023-11-23 janova GmbH Intelligenter Tischtennisschläger

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE515748C (de) * 1931-01-06 Spiel Und Sportartikel Fabrik Tischtennisschlaeger
JPS5215734A (en) * 1975-07-24 1977-02-05 Nippon Tatsukiyuu Kk Table tennis racket
US4324400A (en) * 1979-08-08 1982-04-13 Est Industries, Inc. Table tennis bat blade
DE3417728A1 (de) * 1984-05-12 1985-11-14 Adolf K.W. 7441 Unterensingen Stroh Schlaegerblatt fuer einen tischtennisschlaeger
DE3826986A1 (de) * 1988-08-09 1990-02-15 Jean Werner Dequet Tischtennisschlaeger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2044982A1 (de) * 2007-10-03 2009-04-08 Perseus Co. Ltd. Tischtennisschläger
FR2932390A3 (fr) * 2008-06-13 2009-12-18 Jean Remy Bouvier Raquette de tennis de table
WO2011085692A1 (zh) * 2010-01-17 2011-07-21 Liu Yong 一种握柄减震的乒乓球拍、网球拍、羽毛球拍或壁球拍
WO2012104709A1 (fr) 2011-02-02 2012-08-09 Compagnie Generale Des Etablissements Michelin Raquette de tennis de table et revêtement pour raquette
DE102022112520A1 (de) 2022-05-18 2023-11-23 janova GmbH Intelligenter Tischtennisschläger

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