EP1981600A2

EP1981600A2 - Ball game racket

Info

Publication number: EP1981600A2
Application number: EP07703243A
Authority: EP
Inventors: Rob Cottey; Johan Kotze; Stefan Mohr; Klaus Müller; Klaus Rambach; Jürgen Wilke; Manfred Emberger; Harald Rosenkranz
Original assignee: Head Technology GmbH
Current assignee: Head Technology GmbH
Priority date: 2006-02-02
Filing date: 2007-02-01
Publication date: 2008-10-22
Also published as: WO2007088070A3; WO2007088070A2; US7967706B2; US20100048333A1

Abstract

Disclosed is a racket (2) for ball games, comprising a frame which is formed by a profiled frame or a hollow profiled member and is provided with a racket head and a handle section that is connected thereto preferably via a core region. Two concavities (12) that are symmetrical relative to the longitudinal axis of the racket are embodied in the core region on the frame. A vibrating device (20) is arranged in each of the two concavities. Preferably, the vibrating devices of the inventive racket are effective for vibrations having at least two modes or two degrees of freedom. The invention further relates to a racket for ball games, comprising a frame which forms a head region for receiving strings and a handle section for holding the racket. The frame is fitted with one respective inward-facing C-profile in at least two segments in the head region.

Description

Ball game racket

The present invention relates to a racket for ball games, in particular a tennis, squash, badminton, racquetball or paddle tennis racket with excellent handling characteristics.

Such clubs typically include a frame that forms a club head and a handle portion connected thereto. Typically, a so-called heart region is formed in the transition region between the club head and the grip section. Typically, the frame is formed from a frame profile that is often made from a carbon fiber reinforced plastic material in a molding press. The club head of the racket defines a clothing plane in which the

Covering the racket is arranged. To accommodate the strings of the covering lying through holes are provided on the frame in the stringing level for the performance of stringed strings.

In addition, it is known to provide damping devices on the racket. For example, US 5,651,545 discloses a striker-type vibration damping device comprising a viscoelastic member intended to be mounted between the struts of the striker and at least one movable member carried by the visco-elastic element. The movable member is movable relative to the viscoelastic member in response to a ball impact on the strings of the racket so that the vibration damping apparatus vibrates in the same frequency range as the racket but out of phase to dampen vibrations in the racket.

Another damper is described for example in US 2002/0058557 Al. This

Damper has a viscoelastic part and a mass part laminated thereon. The damper has a horizontal frame and a vertical frame in the form of a framework provided on both sides of the horizontal frame. In this con- In other words, the horizontal frame and the vertical frame are integrally formed with each other by connecting the horizontal frame and the vertical frame with the horizontal frame on at least one surface of the racket in a thickness direction and the vertical frame on both sides of the racket in a width direction is installed.

Furthermore, US Pat. No. 4,353,551 discloses a tennis racket in which mass parts are provided symmetrically with respect to the longitudinal axis of the racket between the heart area and the transverse axis of the clubhead. The weights are displaceable in one direction perpendicular to the clothing plane. The articulation of the weights is carried out by elastic bands whose ends are glued to the front or back of the racket frame. The weights are arranged outside the clubface. According to another embodiment, the weights are mounted on a mounting plate by means of respective coil springs, wherein Durchgangslö- are provided in the racket frame rather, in which the weights are guided in a direction perpendicular to the clothing plane of the racket. The frequency of the damper is tuned to an oscillation frequency of approximately 1.4 times to 2 times the basic natural vibration frequency of the racquet.

In addition, for example, from EP 0 898 986 Bl a device for

Damping vibrations of a ball racket known, in which a damper weight is determined elastically deflectable from the handle axis on or in griffseiti- end of the racket. The damper weight is chosen to be 0.6 to 3.5% of the weight of the stricken racket. The elastic attachment is designed or dimensioned for at least uniaxial deflection with a natural frequency between 100 and 300 Hz. The

Damper weight is disposed in a cavity at the end of the handle in an elastic support which is supported on at least two diametrically opposite positions with respect to the handle axis on the wall of the cavity.

DE 103 04 797 A1 discloses a ball game racket with a racket frame, which forms a racket head for a stringing as well as a racket shaft with racket handle projecting away from the racket head, wherein the racket frame on a racket Frame member between the club head and the racket handle having at least one area with a reduced torsional stiffness, without thereby the bending stiffness of the racket is to be impaired in a longitudinal extent of the frame element enclosing plane perpendicular to the clothing plane. At least one region with reduced torsional stiffness is provided with at least one damping material, for example an elastomeric material which is intended to have a damping effect during deformation.

Other ball game rackets, which in some cases have damping devices, are known from US Pat. No. 5,362,046, DE 196 14 247 C1, DE 100 60 457 A1, DE 195 37 062 A1, DE 195 31

642 Al, DE 201 20 766 Ul and WO-A-88/01890. Furthermore, special designs of the racket frame of a ball game racket are known for example from EP 1 060 767 A2, US 5 082 266 and DE 103 08 532 B3.

The present invention has for its object to provide an improved racket, which allows an excellent damping effect and ball acceleration. This object is achieved with a racket with the features of the independent claims. In the dependent claims preferred embodiments of the racket according to the invention are described.

The racquet for ball games according to the invention has a frame formed from a frame or hollow profile, which has a club head and a preferably connected thereto via a heart region grip portion. The clubhead defines a stringing plane. On the frame two symmetrical to the longitudinal axis of the racket indentations are formed in the heart area. The indentations extend in a direction parallel to the clothing plane and converge toward one another or are open at sides of the frame which point away from one another. Due to the indentations, the width of the racket or the frame in this area is at least partially reduced. The indentations can also be formed by an outwardly facing C-profile of the frame, ie have side walls (in the XY plane parallel to the clothing plane). In each of the two indentations a vibrating device is arranged. Preferably, the inventive Rack arranged vibration devices for vibrations with at least two vibration modes or degrees of freedom or vibrations in at least two different axial directions effectively.

According to another aspect of the invention, two vibration means are provided symmetrically to the longitudinal axis of the racket on the frame in the heart region, which are effective for vibrations with at least two vibration modes or degrees of freedom or vibrations in at least two different axial directions, and their longitudinal direction preferably in the direction of the frame their attachment point runs. The frame preferably has in the heart region two indentations provided symmetrically to the longitudinal axis of the racket, in each of which one of the vibration devices is arranged.

In the case of the racket according to the invention, each of the vibration devices is preferably attached to the frame at two spaced apart locations along the frame in the circumferential direction or in the longitudinal direction of the racket, preferably on its outside, for example in a recess or recess provided there. The vibration device preferably has a mass portion, which is fastened to the frame by at least one viscoelastic element or spring element. The mass part is preferably made of metal, for example steel, iron or non-ferrous metals such as brass, lead, tungsten, titanium, or alloys thereof. Carbon fiber composites and other materials that are rigid in the dimensions of the present invention can also be used. This mass part is preferably elongated and, for example, about 10 mm to 70 mm, preferably about 35 to 55 mm, more preferably about 40 to 50 mm long. The width of the mass part is preferably in the range between about 2 mm and 20 mm, preferably about 4 mm to 10 mm, particularly preferably about 6 mm. The length to width ratio is preferably about 2: 1 to 15: 1, more preferably about 3: 1 to 10: 1, or about 4: 1 to 8: 1. The thickness of the mass part is about 0.5 mm to 5 mm more preferably about 0.8 to 3 mm, more preferably about 1.5 to 2 mm. Preferably, the mass member is slightly bent about a longitudinally extending axis to increase stability. The mass portion of each vibrator is typically a mass of less than 35 g, preferably a mass ranging from 1 g to 30 g, more preferably from 2 g to 20 g, and most preferably from 2.5 g to 10 g. The mass m _{s of} the racket (without vibration devices) is typically about 200 g to 300 g.

The viscoelastic material or spring element is preferably made of an elastomer such as rubber, rubber, e.g. Natural rubber (NR), acrylonitrile butadiene rubber (NBR), polychloroprene rubber (CR), neoprene, formed from a thermoplastic or a thermoplastic elastomer or a flexible foam, such as polyurethane (PUR), or TPUR. For example, the elastomeric material may be a silicone

Be rubber. In principle, all materials which provide suitable spring properties can be used for the spring element. In particular, materials are suitable which have an E-modulus in the range from 1 N / mm ² to 1000 N / mm ² , preferably 50 N / mm ² to 200 N / mm ² , and / or densities preferably in the range of 0.2 g / cm ³ to 3 g / cm- ^5, and most preferably in the range of 0.4 g / cm ³ to 1.8 g / cm ³ .

The mass of the spring member is typically between 1 g and 20 g, preferably between 3 g and 10, more preferably between 5 g and 8 g.

It is further preferred that the ratio between the mass of the mass part and the mass of the spring element of a vibrator in the range of 1:10 to 10: 1, preferably in the range of 1: 5 to 5; 1 or 1: 2 to 2: 1 lies. Moreover, it is preferred that the ratio of the mass of the two vibrators, i. both spring parts and both mass parts, the total mass of the racket (without the two vibration devices) in the range of 1/30 to 1/4, preferably in the range of 1/20 to 1/10.

Preferably, the vibration device and the associated indentation are shaped such that a substantially continuously extending outer peripheral surface is present on the frame. For this purpose, the vibration device preferably has a first mounting section and a second mounting section at the two ends of the indentation and a bridge section connecting the two mounting sections. The bridge section bridges the opening of the indentation, and extends generally in the direction of the frame at the relevant location. The two mounting sections are used to attach the vibrating device at opposite locations within the indentation. For this purpose, the first and second mounting portion is respectively formed according to the curvature of the indentation on the frame. The vibration device is preferably adhered to the frame or plugged by a form or clamping connection, or held by means of form or frictional engagement by the string band of the racket, these mounting options can also be combined, for example gluing and positive engagement. The two mounting portions and the bridge portion together preferably form the spring element of the vibrating device. The mass part is preferably embedded in the bridge section. Instead of a single mass part, several separate or mutually coupled mass parts may be provided in the spring element. Alternatively, the mass part (s) forms the bridge section. In this case, the mounting sections preferably have fastening or bridgehead sections for connection or coupling to the mass part.

The vibration device is preferably effective for vibrations having a plurality of, for example, two or four and up to six degrees of freedom or vibration modes, wherein the coordinate system for describing the vibrations is advantageously chosen such that the X direction in the longitudinal direction of the vibration device, the Y Direction perpendicular to it in the clothing plane, and the Z-direction is perpendicular to the clothing plane. A vibration with a first degree of freedom or oscillation mode is, for example, in a direction of oscillation or axial direction substantially perpendicular to the clothing plane of the racket. This direction is referred to below as the Z direction. The frequency of the vibrations in this

Direction is called frequency f \. An oscillation with a second degree of freedom is, for example, in a direction of oscillation or axial direction essentially in the longitudinal direction of the oscillation device and thus in the direction of the racket frame where the oscillation device is arranged. This direction is referred to below as the X direction. The frequency of the vibrations in this direction is referred to as frequency f2. A vibration with a third degree of freedom, for example, in a vibration or axial direction substantially transversely or perpendicular to the longitudinal direction of the vibrating device in the clothing plane of the racket. This direction is hereinafter referred to as Y-direction. The frequency of the oscillations of this direction is referred to as frequency fβ. The fourth, fifth and sixth degrees of freedom are defined by respective rotational oscillations around the Z, X and Y axes, respectively. Accordingly, a vibration having a fourth degree of freedom is, for example, a rotary vibration of the vibrator about an axis in the Y direction. Such vibration may be referred to as "pounding" with respect to the longitudinal direction of the vibrator. The frequency of this oscillation is referred to as frequency 14. A vibration with a fifth degree of freedom is, for example, a torsional vibration about an axis in the Z direction. Such vibration is also called "yawing". The frequency of this torsional vibration about an axis in the Z direction is referred to as frequency f5. For example, a vibration with a sixth degree of freedom is a torsional vibration about an axis in the X direction. Such a torsional vibration can also be referred to as "rolling". The frequency of this torsional vibration is referred to as frequency fβ.

The vibration device is preferably effective for vibrations in directions of the respective degrees of freedom or vibration modes at different frequencies, or has different natural frequencies. As a result, a vibration device with a broadband damping frequency spectrum is provided, which can be used for damping the natural vibrations of the racket. Preferably, the vibrator is tuned at least in the direction of a degree of freedom to a frequency which substantially corresponds to 0.8 times to 1.2 times the vibration frequency of the racket. Particularly preferred is the

Vibration device tuned at least in a vibration mode or in the direction of a degree of freedom to a frequency which substantially corresponds to the vibration frequency of the racket f Schlöger. This degree of freedom is, for example, the oscillation with the frequency fj perpendicular to the clothing plane. At this frequency, the club vibration is particularly effectively damped. Alternatively, or preferably combined with such tuning, is the vibrator at least in the direction of another degree of freedom tuned to a frequency which is substantially 1.3 times to 3 times, preferably about 1.5 times to 2.5 times, more preferably about 2 times, the frequency of vibration of the racquet matches. As a result, an increase in the impact force of the racket can be achieved because the vibrating element oscillates approximately "in phase" with the racket when the ball leaves the clubface.

Thus, according to the invention, for the natural vibrations of the racket, the vibrator may dampen some or all of the frequencies f1 to f2. As a result, a broadband attenuation spectrum similar to a broadband filter is possible, and the attenuation can be made more effective because vibration energy can be absorbed at different vibration frequencies. In addition, however, it is also possible to set the frequencies fj to fg such that some of the frequencies have a damping effect and other frequencies cause an increase in the impact force of the racket.

Due to the specific design of the vibration device, the frequencies f \ to fg can be set to desired frequencies. It is thus a frequency tuning or frequency matching or a frequency adjustment possible. For this purpose, for example, the mass, the material, the geometry, and / or the mass ratios of the mass part and / or the spring element can be varied. Thus, for example, in the case of a change in the width or thickness of the mass part, the oscillation frequency f1 in the Z direction (perpendicular to the clothing plane) may be greater than the frequency f3 in the Y direction (in the clothing plane) or vice versa.

An even broadband attenuation spectrum can be realized by virtue of the fact that the two vibration devices have different vibration characteristics. This can be realized for example by different mass parts in the respective vibration devices.

Another inventive racket for ball games has a from a Rahmenbzw. Hollow profile formed frame, which in each case has a C-profile in the head region in at least two segments, which opens inwards, ie for covering. C-profile in this context means a cross-sectional profile which is substantially C-, U-, or V-shaped, that is approximately half-ring-shaped. In other words, the profile has a base side and two legs, wings or flanks. Such a C-shaped profile or C-profile, for example, by a along the inside of the

Frame contour extending groove or depression formed. Such a C-shaped profile or C-profile is formed, for example, by two legs protruding from a base surface, wherein the base surface forms a web in which the string openings are formed.

Inwardly oriented or inwardly open means in this context that the C-profile is situated in the clothing plane defined by the head region in such a way that it opens towards the clothing. In this case, the clothing extends in particular into the C-profile, so that the legs of the C-profile or its ends project beyond the clothing on opposite sides, that is, above or below the

Covering extend, preferably substantially parallel to the clothing plane.

According to this embodiment, the side portions or legs of the frame inner side rise with respect to their usual course or with respect to the inner region of the frame inner side and extend into the racket interior, ie beyond the clothing. The inner frame portion of the frame inside preferably retains substantially its original or normal or undisturbed, for example, oval course. On the other hand, the side areas or flanks of the frame inside rise clearly inwards compared to their usual course. This results in a plan view perpendicular to the clothing plane of the racket thickening of the frame width in the corresponding segments, which is formed by the inwardly opening C-shaped contour of the frame profile in these sections. By the inwardly projecting side portions or flanks of the frame, additional material is provided at the relevant location of the frame, which has a maximum distance from the neutral fiber, whereby the flexural rigidity of the frame can be increased. According to a further embodiment of the invention, the C-shaped profile is formed by the fact that the inner region or the web of the C-profile of extending substantially perpendicular to the clothing plane frame inside out of its usual course outwards, ie towards the outside of the frame towards the Page areas is set back.

In other words, according to this preferred embodiment, the C-profile is formed by forming a groove in the frame inside at the respective segments in the head area. In this case, the groove is in cross-section, ie perpendicular to the clothing plane, preferably arranged approximately in the middle of the frame profile inside. In this case, the contour of the frame in the plan view of the clothing level may not be changed, so that the club according to the invention seems to have a common frame profile at first glance.

According to a further preferred embodiment of the invention, the C

Profile formed both in that the side portions of the frame inside or the legs of the C-profile with respect to their usual course and against an inner region of the frame side or the web of the C-profile extend inwardly, and in that the inner region of the frame side opposite its usual course outwards as well as opposite side areas of the frame side is set back.

The head shape of the racket is largely arbitrary and may for example be oval, egg-shaped, teardrop-shaped, rectangular with rounded corners, etc. To define the respective position of the C-profile along the circumference of the club head, usually a dial of a watch is used, the 12 o'clock position being located at the extreme or free end of the club head. Accordingly, the 3 o'clock or 9 o'clock position is approximately in the middle of the total length of the club head.

Preferably, the at least two segments, in which a C-profile is arranged, arranged on the club head, that a first segment between about 12.30 and 2.30 clock, preferably between 1 and 2 clock and in particular at about 1.30 clock and another segment is provided between about 9:30 and 11:30, preferably between about 10 and 11 o'clock and in particular at about 10:30 o'clock. In a further preferred embodiment, the segments are arranged on the club head such that a first segment between about 3.30 and 5.30 clock, preferably between about 4 and 5 clock and in particular at about 4.30 clock and another segment between about 6.30 and 8.30 clock, preferably between about 7 and 8 o'clock and in particular at about 7.30 o'clock is provided.

According to a further preferred embodiment of the invention four segments are arranged on the club head, wherein in each case one segment is arranged in one of the areas described above.

To define the respective position of the segments or of the C-profile along the circumference of the club head, the angle specification of a tangent tangent on the outside of the perimeter of the club head can usually be used, the tangent extending parallel to the club longitudinal axis at the sides of the club head being 0 ° tangent and the horizontal, perpendicular to the longitudinal axis of the racket extending tangent on the top of the club head is referred to as a 90 ° tangent (see Fig. 7).

Preferably, the segments or the sections with C-profile in this definition are approximately in the region of the two upper 45 "tangents and / or approximately in the area of the two lower 45 ° tangents.

The racket is preferably formed symmetrically to the longitudinal axis, wherein the

Segments or sections with C-profile, which are opposite with respect to the bat longitudinal axis, are symmetrical. Preferably, the segments or sections with C-profile are arranged on those frame sections at which the maximum torsional load is to be expected when playing.

The by a C-profile with a respect to their usual course recessed or outwardly offset frame inside caused cross-sectional constriction of the The frame is preferably sized so that the frame width (in the direction parallel to the clothing plane and perpendicular to the frame) is about 45 to 95%, preferably 50 to 80%, more preferably about 60 to 70% and even more preferably about 65% of Width of the corresponding frame profile without C-shape is. In this context, transverse or perpendicular to the frame means approximately perpendicular to a longitudinal axis extending through the frame or through individual frame regions or infinitesimal frame elements. Figuratively speaking, such a longitudinal axis approximately follows the frame contour.

In the preferred embodiment of the present invention, with respect to its usual course inwardly extending and an inner region projecting side regions, the cross-sectional widening effected on the frame profile is preferably dimensioned so that the frame width (in the direction parallel to the clothing plane and transverse or perpendicular to the frame) in about 105 to 140%, more preferably 110 to 140% and even more preferably about 120% to 140% of the width of the corresponding frame profile without C-profile is.

The length along the frame over which the frame is formed as the C-profile is preferably in the range between about 10 mm and about 150 mm, more preferably between about 30 mm and about 100 mm, even more preferably between about 50 mm and about 75 mm.

The C-shaped profile is preferably formed such that the width of the recess formed between the legs of the C or the distance between the legs of the C-profile about 30% to about 90% of the respective overall width of the frame at the appropriate location, preferably from about 40% to about 80%, and more preferably from about 60% to about 70%.

Preferably, the bottom of the trough of the C-profile, so the web at the inner region of the frame inside convex, straight or concave. Preferably, the

Interior of the frame inside, so the trough of the C-profile, flowing into the side areas of the frame inside, so the legs of the C-profile over, where the Ü transition is formed by one or more, possibly changing radii.

The recess of the C-profile preferably has, viewed in cross-section of the frame profile, a substantially circular-arc-shaped cross-section which, for example, has a radius of approximately 5 to 25 mm, more preferably approximately 10 mm. The trough can also be elliptical, hyperbolic, polygonal or rectangular with rounded corners.

Preferably, the C-profile has a cross-section changing along the frame. Preferably, in this case, the C-profile is built up gradually, i. starting from a minimum bowl depth or a minimum limb length of the side regions up to a maximum bowl depth or maximum limb length. Preferably, the C-profile reaches the maximum bowl depth or the maximum leg length in the region approximately centrally to the length of the C-profile along the frame.

According to a further preferred embodiment, the C-profile has the maximum depth of the trough or the maximum length of the legs in a range of about 1/3 to 2/3 of the respective length of the C-profile.

According to a preferred embodiment of the invention, those in the lower, i. C-profiles arranged in the region of the club head facing the handle are transferred into the heart area and / or the bridge of the racket. For example, in each case the inner surface of the side region of the frame inside passes evenly into the bridge. According to an alternative preferred embodiment, the trough formed in the frame inside continuously changes into the bridge.

In this case, if the side portions or flanks of the frame protrude inwardly, results in the plan view of the racket in the respective segments, ie at 4.30 clock to 5 clock, an inwardly projecting bead of the frame, the frame a characteristic appearance and gives increased flexural rigidity at this point. In this embodiment, the heart bridge of the frame is lowered toward the racket handle with respect to the inside of the frame in the areas adjoining the heart bridge and, in addition, its height can be reduced in order to reduce this incidence. to increase pressure. The contour of the inwardly projecting side regions or flanks of the frame can preferably merge smoothly into the contour of the inside of the respective arm of the heart region of the racquet.

In the range around 12 o'clock, 3 o'clock, 6 o'clock and / or 9 o'clock is preferably no C-profile, as described above, formed, and the frame profile has no concave sections in cross-section.

By optimizing the cross-sectional profile of the beater frame in the copy area, the C-profile allows a change in the vibration or damping behavior along the frame, so that an optimized vibration or damping behavior is achieved. In this case, in particular the provision of the C-profile in the areas described as well as the alternating arrangement of frame sections with C-profile and frame sections without C-profile proves to be advantageous. Of particular advantage is also a changing in its profile along the racket frame cross-sectional profile of the C-shape. The C-profile also causes an optimized mass distribution of the entire racket mass and a change or optimization of the rigidity of the racket over the course of the frame. In this way, the playing behavior of the racket can be influenced.

The player also feels subjectively a larger sweet spot, which in particular improves the playing characteristics of the racket. In addition, the bat according to the invention allows an extension of the longitudinal and transverse strings in the areas provided with the C-profile and thus an extension of the free-floating strings lengths. In addition, the string lengths of the transverse or longitudinal strings are aligned with each other and thus their differences in length smaller, resulting in improved shock and play behavior of the racket. Thus, by the racket according to the invention, in particular, an enlarged face area is provided with a constant frame dimension. A larger clubface flows disproportionately into the equation for calculating the impact force (power equation). Already an approximately 2 to 3% enlarged impact surface thus causes an approximately 5 to 30% increase in the Dyno. In particular, the present invention makes it possible to provide an enlarged impact surface with an otherwise constant outer racquet contour.

By covering the clothing by the C-profile also a racket is provided, which in particular has a larger clubface as subjectively perceived and thus improves the subjective gaming behavior.

Particularly preferred is the embodiment of a racquet, which has both a Schwungungseinrichtung invention and at least two segments of the Kopfbe- rich a C-profile according to the invention.

Hereinafter, preferred embodiments of the racket according to the invention are described in detail with reference to FIGS. Show it:

Fig. 1 is a front view of a first embodiment of an inventive

Racket without vibration devices;

FIG. 2 shows a detailed view of a recess in the heart area of the racket according to the invention; FIG.

Fig. 3 is a front view of the racket according to the invention similar to Figure 1, but with vibration devices.

4 shows a detailed view of a recess with oscillation device; 4a-4d are schematic representations of further embodiments of vibration devices;

5 shows a schematic illustration of the available vibration modes or degrees of freedom of the vibration device provided in the racket according to the invention;

6 shows a basic model of a vibration device according to the invention; Fig. 7 is a plan view of a ball game racket according to a preferred embodiment of the invention with C-profile; Fig. 8 is a plan view of a ball game racket according to a preferred embodiment of the invention with C-profile; Fig. 9 is a plan view of a ball game racket according to a preferred embodiment of the invention with C-profile;

10 is a plan view of a ball game racket according to a preferred embodiment of the invention with C-profile. Figure 11 shows the representation of different Rahmenpro file of a ball game racket according to a preferred embodiment of the invention according to FIG. 10. and FIG. 12 shows a schematic diagram of an embodiment of an inventive device

Racket with C-profile.

According to the illustration in FIG. 1, the racket 2 according to the invention has a club head 4, a grip section 6 and a heart area 8 provided therebetween. In the heart region 8, according to the invention, an indentation 12 is provided on the outer side 14 of the frame 16 forming the racquet 2 symmetrically with respect to the longitudinal axis 10 of the racquet 2.

At the club head 4, so-called "flex points" 18 are preferably provided in the region at about 3 o'clock or 9 o'clock, as described in more detail in DE 10 2004 003 528 and DE 10 2004 003 526. In this case, four trough-shaped indentations are provided essentially in the area of the club head, which are arranged in pairs opposite one another on the front or rear side and substantially symmetrically to the longitudinal axis of the club. Each pair of opposing indentations may have an opening that is substantially perpendicular to the stringing plane of the racquet and extends through the frame profile.

In addition, a club according to the invention preferably has a substantially C-shaped cross-sectional profile on both sides of the longitudinal axis 10 in areas of the club head facing the heart region, in which the two legs of the C project into the clothing surface. This is shown in FIG. 1 by the solid or dashed line. This is in connection with the description of the

Fig. 7 to 12 received in more detail. The indentation 12 on the racket according to the invention is shown in more detail in FIG. As shown in FIG. 2, the indentation 12 extends in a direction parallel to the clothing plane of the racket. By the indentation 12, the cross-sectional profile of the frame 16 is reduced in the region of the indentation. The logging itself preferably has a length 1 of about 40 mm to 100 mm, more preferably 50 mm to 80 mm, and most preferably 60 mm to 70 mm. The maximum depth t of the indentation across the frame is preferably about 5 mm to 30 mm, more preferably 10 mm to 20 mm, and most preferably 14 mm to 17 mm. The indentation preferably extends through the entire thickness of the frame profile, ie from the racket front to the racket back.

In Fig. 3 the racket 2 according to the invention with two in the indentations 12 symmetrically mounted to the longitudinal axis of the racket vibration means 20 is shown. An enlarged view of a recess 12 with mounted vibration device 20 is given in Fig. 4. As shown in FIG. 4, the vibrator 20 is preferably shaped and dimensioned to be received in the recess 12 so that the outer peripheral surface 14 of the frame travels substantially continuously over the vibrator 20. For this purpose, the vibration device according to the embodiment shown in FIGS. 3 and 4 has a first mounting section 22, a second mounting section 24 and a bridge section 26 connecting the two mounting sections. The two mounting portions 22, 24 and the bridge portion 26 are preferably formed of a viscoelastic material or elastic material as a unitary component. Suitable materials for this component are in particular elastomers, such as rubbers, rubber, or foam materials in question, for example silicone rubber. The two mounting portions 22, 24 and the bridge portion 26 form a spring element of the vibrating device. In or on the spring element, a mass portion 28 is provided. Preferably, the mass portion 28 is embedded in a cavity in the bridge portion 26. Alternatively, the mass part may also be arranged on a surface of the spring element. In addition, several mass parts 28 may be provided. It is also possible to provide a plurality of connecting regions between the mounting sections and the bridge section. The frame-side curvatures of the mounting sections 22, 24 speak preferably substantially the curvatures of the indentation 12 on the frame 16 of the racket, so that the mounting portions lie there form-fitting manner.

For the passage of a string 30 through the frame 16 in the area of the oscillation device, in particular in the region of the second mounting section 24, it is preferred that the mounting element 24 in the region of a string inlet opening or string outlet opening 32 fork-shaped with a recess (not shown). train. In this recess, the string 30 can be guided in the region of the mounting portion 24 using a conventional Ösenbandes.

The attachment of the vibration device 20 in the recess 12 is preferably carried out by bonding the contact surfaces of the mounting portions 22, 24 with the opposite surfaces of the frame 16. Preferably, the contact surface and the opposite frame surfaces have corresponding contours, to an improved attachment and / or coupling to achieve the vibration device on the frame. The length L of the vibrator extending in the direction of the X axis substantially corresponds to the length l of the indentation 12. The bridge portion 26 preferably has a length of at least 50%, more preferably at least 75%, even more preferably at least 85% Overall length L of the vibrator 20. The width of the bridge portion 26 (in the direction perpendicular to the paper or racket plane, ie in the Z direction) is preferably smaller than the frame height of the racket in this area. Typically, the width of the bridge portion 26 is less than 50%, more preferably less than 40% of the frame height in this range. The width of the bridge portion is thus, for example, in the range between 2 mm and 25 mm, more preferably between 5 mm and 15 mm, and most preferably between 7 mm and 10 mm. The thickness d of the bridging portion 26 in the Y direction measured in the racket plane is preferably in the range between 1 mm and 5 mm, more preferably in the range between 2 mm and 4 mm. The width of the mounting sections 22, 24 is preferably greater than the width of the bridge section and is limited by the height of the frame profile 16. Typically, the width of the mounting portions 22, 24 in the contact area with the frame is about 10 mm to 40 mm, more preferably 15 mm to 30 mm, and most preferably 25 mm to 28 mm.

FIGS. 4a and 4b show an alternative embodiment of a vibration device 20 provided in the heart area 8 of a racket 2 according to the invention. 4a shows a side view of the frame 16 and the vibrator 20 and Fig. 4b shows a front view similar to Fig. 4. According to this embodiment, the vibrator 20 is formed substantially cuboid, wherein the mass member 28 similar to the previously described embodiments in a Bridge section 26 is embedded. The mounting portions 22, 24 of the vibrator 20 are not specially formed in this embodiment, but formed by the opposite ends of the bridge portion. For mounting the vibration device 20 on the racket frame 16 opposite recesses 34, 36 are provided in the frame 16, in which the mounting portions 22, 24 of the vibratory device 20 are preferably received substantially positive fit.

The attachment of the mounting device itself can, preferably similar to the above-described embodiment, be made by gluing. The indentation 12 in this embodiment can, as shown, be made less continuously than in the embodiment illustrated in connection with FIGS. 1-4, namely, for example, by relative abrupt contour changes in the frame profile, and can be essentially rectangular in the frame cross section. However, it is also possible in this embodiment, the Rahmenprofϊl form by less abrupt profile changes, similar to the embodiment of Figures 1 -4.

The embodiment shown in Figure 4c in side view of the frame 16 substantially corresponds to the embodiment of Figure 4a and 4b, but there are the mounting portions 22, 24 of the vibrating device 20 formed narrower than the bridge section 26. This allows the vibration behavior of the vibrator 20 in the vary in respective vibration directions or modes.

Another embodiment of a racket according to the invention is shown schematically in front view in FIG. 4d. According to this embodiment, the sway Supply device 20 without indentation on the racket frame 16 in the heart area 8 attached. For this purpose, the mounting portions 22, 24 are fixed to the outer peripheral surface 14 of the racket frame 16 and the bridge portion 26 connects the two mounting portions 22, 24 with each other, for example, arcuate. The mass portion, not shown in FIG. 4d, may be embedded in the bridge portion 26 and, for example, may be smaller than the bridge portion 26, as shown in FIGS. 4 to 4c. The mass part can also form the entire bridge section. In this embodiment as well, the vibration device 20 has the advantages of the various vibration modes, as already discussed in connection with the above embodiments.

FIG. 5 schematically shows six different oscillation modes with the frequencies f 1 to fg. On the left side of FIG. 5, the bat or the vibrating device arranged in the indentation of the racket frame is shown in plan view, that is to say in FIG. it is shown the X-Y plane. The right-hand illustrations of FIG. 5 each show a side view and a side view, respectively, of a vibration device arranged in a recess of the racket frame, that is to say a side view. the X-Z plane. The respective deflections of the vibrating device are indicated schematically.

In the vibration mode with the frequency f \, the vibration device in Z is

Direction deflected. In the oscillation mode with the frequency f ^" 2, the deflection of the vibrator takes place in the X-direction, ie in the longitudinal direction of the vibrator

Vibration device in Y direction. In the vibration mode with the frequency fy, a rotational vibration of the vibrator takes place about the Y-axis, which may be referred to as "pounding" with respect to the longitudinal direction of the vibrator. In the vibration mode with the frequency f§, a rotational vibration takes place about the Z axis, which can be referred to as "yawing" with respect to the longitudinal direction of the vibration device. Finally, in the vibration mode of the frequency fg, rotational vibration takes place about the X-axis, which is referred to as "rolling" with respect to the longitudinal direction of the vibrator can be. In this case, practically takes place a rotation of the vibrating means about its longitudinal axis, which is not shown in the side view.

Figure 6 shows a principle model or equivalent circuit diagram of a vibrating device according to the invention, in which the mass m is suspended in the racket frame in the form of a bar by eight springs with the spring constants ci, cy to C4, C4 'in an indentation indicated only in the figure. Figure 6 is a schematic perspective view. It can be seen from FIG. 6 that the frequencies of the individual vibration modes of the vibration device can be varied or tuned by varying the mass m and the spring constants c 1 to c_v, and thus a desired one

Damping characteristics and club acceleration can be adjusted. The individual spring pairs _{Cl> Cl} , bj _{s C4> C4} , can either have the same or a different spring constant. Optionally, the spring pairs C ₃ , C _{3 '} and C ₄ , C _{4' are} each replaced by a single spring C ₃ and C ₄ , since the required restoring force at a deflection by the two spring pairs Ci, Cy and C ₂ , C _{2 '} can be provided.

A further preferred embodiment of a ball game racket 100 according to the invention is shown in FIG. The fiction, contemporary racket 100 corresponds in its basic structure essentially a conventional ball game rackets. Accordingly, the racquet 100 according to the invention has a head region 300, a heart region 500 and a grip portion 700. As already described above, the heart area 500 of the racket according to the invention is essentially the connecting area between the head area 300 and the grip portion 700 and has, for example, an opening 900. The opening 900 is from two side sections or arms

110 and 130 and a connecting portion or a bridge 150 in the head portion 300 of the racket 100 formed. The heart area 500 of the racket 100 according to the invention can also be formed without the opening 900, contrary to the embodiment shown in FIG. 7, ie the handle section 700 can extend closed to the head area 300. Also, the connecting element or the bridge 150 is optional. Thus, the heart region 500 may be formed only from the extensions 110 and 130 of the head portion extending toward the grip portion 700. Furthermore For example, the heart region 500 may include a second connector (not shown).

As already explained above, the racket 100 according to the invention is based on the idea of providing in each case at least two segments 170 an inwardly oriented C-profile 190, which therefore opens towards the covering (not shown).

C-Profϊl 190 referred to in this context, a cross-sectional profile which is substantially C-shaped, so approximately halbbringfδrmig or provided with a base side or web and two legs. Such a C-profile can be angular, round, pointed and / or flat or wide. Such a C-shaped profile is defined, for example, by the provision of a groove, trough or depression 230 which tapers along the frame inside 210 of the frame contour. In the illustration according to FIG. 7, the groove or depression 230 is covered by the side region of the frame or one limb of the C-shaped profile. Only the bottom or the bottom 250 of the groove is shown in dashed lines as a hidden line. Here, the fabric extends into the C-profile, so that the legs or flanks 270 of the C-profile 190 and its ends project beyond the fabric, so extend over or under the fabric. In the region of the club head 400, the frame preferably has a plurality of through-holes, essentially lying in the clothing plane, for passing stringing strings which are in the region of the segments 170 or in the C-shaped profile in the region of the inner region of the frame inside or in the region of the trough or recess 230 are formed or open in the bottom 250 of the trough or recess 230.

The head shape of the racket 100 shown in Fig. 7 is formed oval, but may, as described above, be largely arbitrary. In the embodiment shown in FIG. 7, the C-shaped profile sections 190 or the segments 170 are arranged approximately between 3.30 o'clock and 5.30 o'clock or between 6.30 o'clock and 8.30 o'clock. According to a further preferred embodiment, as shown in FIG. 8, two further segments 170 or C-shaped profiles 190 are provided in areas between approximately 12:30 and 2:30 and between 9:30 and 11:30. Preferably, the frame is provided in at least two of said areas with a C-profile according to the invention. Overall, the racket is preferably formed mirror-symmetrically along its longitudinal axis C, ie, the respective segments 170 and C-profiles 190 on the left and right racket half, with respect to the longitudinal axis C, are identical.

According to a further preferred embodiment of the invention, the C-sections 190 or segments 170 are formed approximately around the area of the contact point of the racket frame with the upper and / or lower 45 "tangents to the racket frame in Fig. 7, at an angle of about 45 ° on the outer contour of the racket frame fitting tangent, wherein the vertical tangent 290, which is parallel to the C-axis, is referred to as 0 ° tangent and the horizontal tangent 310, the 7, the 45 ° tangent on the upper half of the racket shown on the right in FIG. 7 is denoted by 330. The symmetrical 45 "tangent also indicates this the left upper half of the racket and the two 45 ° tangents in the lower racket half are outlined in FIG. Their positions on the clubhead relative to the "clock" position depend on the shape of the clubhead.

Typically, the C-profiles extend approximately symmetrically about the 45 ° tangents, such as from the 20 ° tangent to the 70 ° tangent.

The segments 170 and the C-profiles 190 are preferably formed in the areas of the frame in the head region of the racket, in which the game during the maximum

Torsional stress occurs or at which can be expected with the maximum occurring torsional stress. Preferably, these areas are mirror-symmetrical to each other with respect to the C axis in each case twice in the lower club head area and twice in the upper club head area.

In the embodiment shown in FIG. 7 or FIG. 8, the C-profile 190 is preferably designed such that a dashed inner area of the frame-shaped inner side 210 is set back relative to its usual course and opposite side portions of the frame inside to the outside, so that forms a trough 230 in the frame profile and this assumes a C-shaped cross-sectional structure. In plan view (from the clothing plane) on the inside frame side 210 in the region of the C-profile 190 such a trough 230 is preferably arranged approximately in the center of the frame. Compared to the inner region of the frame inner side 210, the corresponding side regions in the region of the C-profile 190 are not set back, but essentially follow the frame contour, as defined by the non-C-profüierten areas. Thus, the contour of the racquet of FIG. 7 resembles the corresponding areas in the upper region of the racquet head in segments 170 having C-profile 190, as shown in the lower portion of the racquet head at about 5 o'clock and about 7 o'clock, at about 11 Clock and at about 1 o'clock, at which in the preferred embodiment shown in Fig. 7 no C-profile is provided.

Preferably, the frame profile in the relevant segments 170 gradually transitions into the C-profile until it assumes its maximum extent, in order subsequently to re-enter the frame profile without C-shape in a fluent or gradual manner.

9 and 10 show a further preferred embodiment of a ball game racket according to the invention, which has a C-shaped profile in sections in the head area. hi the preferred embodiment of FIG. 9, the outer contour of the racket

100, the C profile is not recognizable as such. In contrast, FIG.

10 dashed lines and hidden lines, whereby the formation of a C-profile 190 in

Segment 170 becomes clear. In the preferred embodiment according to FIG. 10, the C-profile 190 is arranged approximately in the range from 5:00 to 5:30 and approximately in the range from 6:30 to 7:00. The C-profile according to FIG. 10 differs from the C-profile.

Profϊl according to FIGS. 7 and 8 in that according to this embodiment, the

Side regions of the frame inner side 210 extend inwardly relative to their usual course, so that they protrude with respect to an inner region of the frame inner side 210. As can be seen in FIG. 10, the (dashed) inner portion of the frame inner side 210 merges from the C-shaped profile portion 170 into the bridge 150, whereas the side portions of the frame inner side, which are the legs or flanks 270 of the C-shaped profile forming, projecting inwardly and then on the handle facing the end of the segment 170 with C-shaped profile 190 flowing into the arms

110 and 130 of the heart region 500 of the racket 100 pass over. By the inwardly projecting flanks 270 of the C-Profüs additional material is provided at these locations of the club head, that is approximately between 5 o'clock and 5:30 o'clock, which has a maximum distance from the neutral fiber, whereby the flexural rigidity is increased. According to this embodiment, the bridge 150 of the heart region 500 can also have a C-profile 190 according to the invention (shown in dashed lines in FIG. 10), albeit a comparatively slightly pronounced one.

At the club head 300, so-called "fiex points" 610 are preferably provided again in the region at about 3 o'clock or 9 o'clock, as described in more detail in DE 10 2004 003

528 and DE 10 2004 003 526 are described.

FIG. 11 shows profile views at different positions along the frame profile of the ball game racket 100 shown in FIG. 10. FIG. 11a shows a cross-sectional view of the profile of the racket 100 according to FIG. 10 at the section AA, FIG BB, Fig. 1 Ic at the section CC and Fig. 1 Id at the section DD. By way of example, FIG. 1a shows a cross-sectional profile of a ball game racket according to the invention outside the segments 170 with C-shaped profile 190. In this area, the frame has only on its outside a trough 350 for receiving, for example, a wear frame or head band, not shown. 1b shows the cross-sectional profile of a ball game racket according to the invention in the region of the segments 170 with C profile 190. Here, clearly visible is the trough 230 formed in the inner area of the frame inner side 210, which is defined by the projecting side areas 370 of the frame inside 210 towards the inside of the racket oriented C-profile 190 is formed. As described in connection with Fig. 10, the C-profile 190 is formed by the side portions 370 as leg 270 of the C-profile 190 with respect to the usual course of the frame inside 210, dashed lines in Fig. I Ib shown as 410, inwardly , So projecting towards the fabric and thus form the trough 230.

11 c and 1 Id show, by way of example, further cross-sectional profiles of a ball game racket according to the invention outside the segments 170 and without C profile 190.

Fig. He shows a superposition of the cross-sectional profiles according to Fig. I Ia to Hd and Fig. 1 If shows the profile of the frame profile in plan view of FIG. 9 in the region of

Sections A-A to D-D.

The circumference of the frame profile is approximately 120 mm in the cross section illustrated in FIG. 1b, and only approximately 67 mm in the case of the cross section in the copier region (see, for example, FIG. 10 at 12 o'clock). Preferably, the ratio of the maximum circumference of the C-profile to a minimum circumference in the head region is at least about 1.4, preferably at least about 1.6, more preferably at least about 1.75. Such a circumferential variation allows advantageous design possibilities of the rigidity in the circumferential course due to the C-profile.

The ratio of circumference to enclosed area is substantially greater in the case of the cross section in Fig. Ib and generally in the region of the C-profile than without the C-profile. The combination of this circumference-to-area ratio with the variation in the perimeter of the frame profile, as described above, enables the achievement of particularly advantageous properties in terms of stalling torsional obstruction and torsional properties in general.

As material for the racket 100 according to the invention, all known materials for tennis, squash, badminton, paddle tennis and other racquets for ball sports are suitable. In particular, the racket 100 according to the invention is made of wood, metal,

Metal alloys, plastic, carbon fiber composite material, fiber materials, composites and combinations thereof can be produced. The racket according to the invention allows an optimized change of the cross-sectional profile of the racket frame by the formation of an inwardly open C-profile in selective sections of the head area. The reduction of the torsional strength in the area of the C-profile allows an optimized absorption of the corresponding forces and

Moments in the rackets, which are taken up in particular by the club at the transitions of the C-profile in the ordinary profile structure. Thus, by the inventive design of a ball game racket an optimization of the vibration or damping behavior of the racket along the frame aims, so that an optimized vibration or damping behavior is achieved, resulting in particular to improved handling and play characteristics of the racket leads to a reduction in the forces, shocks or vibrations that go into the player and, as a result, to a reduction in the burden, susceptibility to illness and fatigue of the player. In this case, in particular the provision of the C-profile in the described areas and the alternating arrangement of frame sections with C-profile and frame sections without C-Profϊl and in particular the creation of transitions between C-profiled frame structure and not C-profiled frame structure proves to be advantageous. Of particular advantage is also a C-profile changing within the respective segments along the racket frame, wherein advantageously the depth, width and shape of the tray or the length, width and shape of the legs change continuously and preferably uniformly.

In this context, the various configurations of the C-profile, as described for example with reference to FIGS. 7 and 10, basically do not differ. The various possibilities of forming a C-profile, however, allow optimized beater characteristics, depending on the application requirements. According to a preferred embodiment, the two types of C-profile can also be combined on a racket, but the racket, as already described, preferably is mirror-symmetrical along its longitudinal axis.

The C-profile of the invention also causes an optimized mass distribution of the entire racket mass. In particular, the provision of such a C Profils in addition to the advantages mentioned reach an optimized positioning of the club's center of gravity. In this case, in particular by the inwardly projecting C-shaped profile, as shown for example in Fig. 10, a displacement of the club center of gravity to the heart area can be achieved, which in particular causes a more power-saving handling and thus improved playability of the racket.

In addition, the formation of a C-profile, as described for example in connection with FIG. 8, makes possible an enlargement of the striking surface and thus an improvement of the playing characteristics. In particular, the free-floating string length of the longitudinal and / or transverse strings of the racquet clothing can be increased, which likewise improves the playing characteristics of the racquet.

Fig. 12 shows a schematic diagram of an embodiment of a racket according to the invention, in which by providing four segments with C-shaped profile, the exit surface of the strings extending therefrom from the frame relative to a conventional cross-sectional profile can be offset to the outside, creating an extension of the free-swinging Strings is achieved. In this case, FIG. 12a schematically shows the positioning of the eye point 510 according to a conventional club profile and the positioning of the eye point 530 according to a club tread according to the invention, resulting in an extension of the respective string 550, 550 'by a length

Δs yields. With appropriate alignment of opposite (in the longitudinal and / or transverse direction) C-profiles, an extension of Δs _j + Δs2, as shown in Fig. 12a. FIG. 12b shows a schematic diagram of a conventional string 550, 550 'with a length L, which is struck by a ball 570 and thereby deflected by Δxj. In contrast, a string 550, 550 'according to the invention

Training with a length of L + Δs _j + ΔS2 is shown, on which a ball 570 impinges, this string undergoes a deflection of Δx2.

With otherwise the same ratios, the deflection Δx2 is greater than the corresponding deflection Ax \ a shorter side alone in a string of the racket according to the invention due to the difference in the string length alone. The shorter string according to the The prior art is thus stiffer, which in turn leads to increased ball deformation. Since the elastic properties, in particular the energy substitution at the impact, of the ball are many times worse than those of the string, a large part of the energy of the impact is lost by the deformation of the ball. In comparison, the string of a racquet designed according to the invention experiences a greater elastic deflection, ie a larger amount of impact energy leads to greater elastic deformation of the strings, which in turn deliver this energy to the ball, thus resulting in less energy being lost. A racket according to the invention, in particular in the embodiment shown in FIGS. 9 and 10, accordingly allows particularly good energy utilization, protects the player and improves the playing characteristics.

Since, in particular, as shown in Fig. 12a, an inventive design of the ball game racket when providing four segments with C-shaped profile, as also described in connection with Figure 7 or 9, to an extension of both longitudinal and transverse strings, and In particular, the usually shorter strings in the upper, lower and lateral edge region of the racket clothing leads, the ratios of the string lengths are equalized. By such an approximation of the ratios of the string lengths, in particular an enlargement of the sweet spot is achieved. An inventive racket thus allows an increase in the free-floating string length and, consequently, an increase in the

Face and the sweet spot with otherwise unchanged outer geometry and dimensions of the racket and along with the advantages already described above with respect to the damping and vibration behavior. Thus, a club according to the invention preferably has a striking surface which is increased by about 0.5 to 5%, more preferably a 1 to 3% larger striking face than a conventional club face

Racket without inventive C-profile on. It should be noted that due to the explained in connection with Fig. 12 relationships, the percentage increase in the club face receives disproportionately in the so-called "power equation" for calculating the impact behavior of the racket. Even a slight enlargement of the striking surface thus leads to a perceptible improvement in the playing behavior. In addition, by the legs of the C-profile just the area of the fabric is covered, which was gained by the provision of the C-profile. Thus, for example, in the embodiment according to FIGS. 7 and 8, the racket subjectively has a smaller top surface than the actual striking surface due to the C-shaped profile drawn inwards. Thus, the player perceives the perceived face smaller than the actual face. Thus, a ball game racket according to the invention has objectively greatly improved game characteristics and in particular a larger sweet spot than expected by the player compared to the subjectively expected game characteristics. Due to the high influence of the subjective feelings of the athlete when practicing the sport can thereby achieve an improved game of the player.

An inventive ball game racket thus ensures compared to the known in the art racket improved vibration or damping and torsional behavior and improved stiffness.

To be particularly advantageous, the combination of the vibrating device according to the invention, as described for example in connection with FIGS. 1 to 6, with the inventive C-profile, such as in connection with the

Fig. 7 to 12 described, result.

An example of such a combination is shown in Figs. 1-4 and 4d. In particular, the improved by the C-profile racquet behavior and the vibrating device according to the invention cause synergistic effects in relation to the club behavior of the invention and the associated effects on the game behavior.

The ball game racket according to the invention also proves advantageous, in particular in combination with the so-called "flex points" 610 described above, with regard to the stiffness behavior of the racket and the associated effects on the gaming behavior.

Claims

claims

A ball game racket comprising a frame having a club head, a handle portion and a heart portion provided between the racket head and the handle portion, the frame having two indentations symmetrical to the longitudinal axis of the racket, in each of which a vibrator is arranged.

The ball game racket of claim 1, wherein each of the vibrators is connected to the frame at two spaced locations along the frame.

A ball game racket comprising a frame having a club head, a handle portion and a heart portion provided between the racket head and the handle portion, the frame having two vibrating means symmetrical to the longitudinal axis of the racket, each of the vibrating means being at two spaced locations along the frame connected to the frame.

4. Ball game rackets according to claim 3, wherein the frame has two symmetrical to the longitudinal axis of the racket provided indentations, in each of which one of the vibration means is arranged.

A ball game racket having a frame having a club head, a handle portion, and a heart portion provided between the club head and the handle portion and having two vibrating means symmetrically to the longitudinal axis of the racket, in particular any one of claims 1 to 4, wherein the vibration vibrating means comprises at least two Degrees of freedom are effective.

6. Ball game racket according to one of claims 1 to 5, wherein the vibration means are arranged in the heart region of the frame.

7. Ball game racket according to one of claims 1 to 6, wherein the vibration device comprises a mass portion which is fixed by at least one spring element on the frame.

8. Ball game rackets according to claim 7, wherein the mass portion is formed of metal.

9. Ball game rackets according to claim 7 or 8, wherein the spring element is formed of a rubber.

10. Ball game racket according to one of claims 1, 2 and 4 to 9, wherein the vibration device and the associated indentation are shaped such that a substantially continuously extending outer peripheral surface is present.

11. A ball game racket according to any one of claims 1 to 10, wherein the vibrating means comprises a first mounting portion, a second mounting portion, and a bridge portion connecting the two mounting portions.

12. Ball game racket according to claim 11, wherein the mass part is embedded in the bridge section.

13. Ball game racket according to claim 11, wherein the mass portion forms the bridge portion.

14. Ball game racket according to one of claims 11 to 13, wherein the first and second mounting portion and the bridge portion form the spring element.

15. Ball game racket according to one of claims 11 to 14, wherein the first and second mounting portion respectively corresponding to the curvature of the indentation on

Frame are shaped.

16. Ball game racket according to one of claims 1 to 15, wherein the vibration device is glued to the frame.

17. A ball game racket according to any one of claims 1 to 16, wherein the vibrator is effective for six degree of freedom vibrations.

18. A ball game racket according to any one of claims 1 to 17, wherein the vibrator is effective for oscillations in directions of the respective degrees of freedom at different frequencies (fj, f2, f3, f_}, f5, fβ).

19. Ball game racket according to one of claims 1 to 18, wherein the vibration device has a broadband attenuation spectrum.

20. Ball game racket according to one of claims 1 to 19, wherein the vibration device is tuned at least in the direction of a degree of freedom to a frequency which substantially corresponds to 0.8 times to 1, 2 times the vibration frequency of the racket (fschläger) ,

21. A ball game racket according to claim 20, wherein the vibration device is tuned at least in the direction of a degree of freedom to a frequency which substantially corresponds to the vibration frequency of the racket (fschläger).

22. Ball game racket according to one of claims 1 to 21, wherein the vibration device is tuned at least in the direction of a degree of freedom to a frequency which corresponds to substantially 1.3 times to 3 times the vibration frequency of the racket (fschläger).

23. Ball game racket according to claim 22, wherein the vibration device is tuned at least in the direction of a degree of freedom to a frequency which corresponds to substantially 2 times the vibration frequency of the racket (fschläger).

24. Ball game racket according to one of claims 1 to 23, wherein the vibration device is arranged on the outside of the frame.

25. Ball game racket according to one of claims 1 to 24, wherein the two vibration devices have different vibration characteristics.

26. A ball game racket comprising a frame forming a head portion (300) for receiving a string and a handle portion (700) for holding the ball game racket, the frame on the head portion (300) in at least two segments (170) each one inwardly oriented C-profile (190).

27. Ball game racket according to claim 26, wherein the C-profile (190) consists essentially of two legs (270) and a recess (230) arranged therebetween.

28. Ball game racket according to claim 27, wherein the C-profile (190) is at least partially formed by the legs (270) on the frame inside (210) opposite to the usual course (410) of the frame inside (210) projecting inwardly.

29. Ball game racket according to one of claims 26-28, wherein the C-profile (190) is at least partially formed by the inner region of the frame inside (210) is set back relative to its usual course (430) out to the outside of the frame.

The ballgame racquet of any of claims 26-29, wherein segments (170) are located at about 12.30 to 2.30pm and at about 9.30am to 11.30pm.

The ballgame racquet of any one of claims 26-30, wherein segments (170) are located at about 3.30 to 5.30pm and at about 6.30am to 8.30pm.

32. Ball game racket according to one of claims 26-31, characterized in that the C-profile is formed such that the frame profile at the two legs (270) of the C-profile is at least 10% wider than at the web connecting the legs ( 250) of the C-profile.

33. Ball game racket with the features according to any one of claims 1-25 in combination with the features according to any one of claims 26-32.