ES2727900T3 - Racket for ball game with electronic part inserted - Google Patents

Abstract

Set with: a racket for a ball game with a head section to accommodate a string and a grip section (1) with a grip cap (11), the grip section (1) having a cavity (3) for the replaceable housing of an electronic part (2); an electronic part (2) with a battery; and a ballast piece, the ballast piece having essentially the same mass as the electronic piece (2); the cavity (3) being designed in such a way that the electronic part (2) or alternatively the ballast part can be housed with a predefined orientation in a predefined position in the cavity (3) and can be held with this orientation in this position , the cavity (3) and the electronic part (2) presenting fixing elements that mesh with each other; a connection being provided at a first end of the electronic part (2) with the help of which the battery can be charged in the cavity (3) without having to remove the handle cap (11) of the ball game racket.

Description

DESCRIPTION

Racket for ball game with electronic part inserted

The present invention relates to a ball game racket, in particular a tennis racket, with a replaceable electronic part.

It is already known to equip ball game rackets with electronic assemblies and / or sensors to, for example, actively dampen vibrations in the racket or measure certain properties during the game. Thus, for example, from document EP 1177816 A1 a ball game racket is known which has at least one converter, which, in case of deformations, converts mechanical energy into electrical energy, as well as an electrical circuit connected to the converter. All energy fed to the converter is derived in this respect from energy that is extracted from mechanical deformation. The converter in turn converts this electrical energy into mechanical energy that influences the vibrational properties of the racket. The electrical circuit is housed in this respect in a cut in the handle section and this cut is filled with a plastic foam to fix the circuit. Alternatively, the circuit may be attached to the racket grip section or be fixedly mounted to the racket grip cap.

In these conventional rackets, however, it has been found as disadvantageous that the racket must already be provided in the manufacture of the desired electrical circuit. This makes it virtually impossible to retrofit a racket accordingly or replace the electrical circuit of such a racket with a new or improved circuit.

The present invention aims to provide in this context a more flexible solution.

WO 2014/004812 A2 (priority of 03-14-2013; publication of 03-01-2014) describes a ball game racket with a head section for housing a string and a handle section with a cap handle, the handle section presenting a cavity for the replaceable housing of an electronic part. In this document, the cavity of a golf club is also designed in such a way that the electronic part or alternatively a ballast piece can be housed in the cavity. The goal stick battery can also be charged inside the golf club.

Correspondingly, the present invention relates to an assembly according to claim 1, with a ball game racket, an electronic part and a ballast piece. The ball game racket has a head section for housing a string and a handle section, a cavity for the replaceable housing of the electronic part being provided in the handle section. The cavity is designed in this respect such that the electronic part can be housed with a defined orientation in a predefined position in the cavity and can be held with this orientation in this position. The defined orientation and the defined position of the inserted electronic part are important in this respect because the electronic part, depending on its functionality, can have, for example, acceleration sensors or gyroscopic sensors whose signals can only be evaluated in a useful way if Know the orientation and position of such sensors.

The electronic part is housed in the cavity in a statically determined manner. The cavity is provided with a mechanism that allows the electronic part to be detachably fixed in the cavity. In this regard, preferably elements of the electronic part are engaged with corresponding counterparts within the cavity. For this, the electronic part, for example, can be detachably locked in the cavity. Additionally or alternatively, it is possible that the electronic part, for example, with the help of corresponding grooves, is guided on the inner side of the cavity. At the end of the cavity on the side of the racket head, a spring and / or an elastic element may preferably be provided, against whose recovery forces the electronic part is inserted into the cavity. At the end of the cavity on the side of the handle cap, a mechanism can be provided with the help of which the electronic part can be removed from the cavity again due to the missing forces. This mechanism can also be constituted by the grip handle itself which, in this case, as soon as it is fixed in the grip section of the ball game racket, holds the electronic part in position.

Particularly preferably, the cavity provided in the handle section has an opening at the end of the handle cap side of the handle section that can be closed with the help of a handle cap. In another preferred embodiment, the cavity can also, however, have an opening in a side wall section of the handle, which, for example, can be closed by means of the grip tape.

According to the invention, it is possible in a simple way to remove the electronic part inserted in the cavity again from the cavity without destroying in this respect the electronic part or its bearing on the side of the racket. In this way, the electronic part can be easily replaced by a new electronic part, equipped with additional components such as sensors or programmed again. Particularly preferably, for the replacement of the electronic part it is only necessary to disassemble the handle cap of the handle section and, optionally, disassemble an interlocking and / or additional fixation of the electronic part in the cavity.

Preferably, the ball game racket has at least one sensor and / or a processor. As sensors, for example, acceleration sensors, gyroscopic sensors, magnetometers, temperature sensors, g Ps sensors and the like come into consideration. The sensors may be installed in the handle section and / or in the head section of the ball game racket. Preferably, an electrically conductive connection is provided in the handle section which is suitable for connecting the electronic part with the sensors and / or the processor. If the sensor and / or processor are arranged in the handle section, in the case of the connection it may be a direct connection between these components and the electronic part. However, if some of these components or all of them are arranged in the head and / or heart section of the ball game racket, a cable preferably goes from these components to the handle section, where the connection is provided electrically conductive that is suitable for establishing a connection with the electronic part. In this sense, it can be, for example, a plug-in connection and / or a spring contact. Preferably, this connection ensures not only the electrical connection between processor and / or sensor, on the one hand, and electronic part on the other, but also a mechanical connection between the electronic part and the handle section. Thus, for example, a plug-in connection can be provided in the handle section in which the corresponding counterparts of the electronic part are mechanically interlocked, while establishing an electrically conductive connection. A connection with a spring contact can also contribute to the mechanical stabilization of the electronic part, as explained above.

Additionally or alternatively to the sensor and / or processor in the ball game racket, a sensor and / or processor may also be provided in the electronic part. If all electronic components and sensors are arranged in the electronic part, an electrically conductive connection between the electronic part, on the one hand, and the components in the handle section, on the other hand, can be dispensed with. For certain applications, however, it is preferred that external electronic components be additionally provided outside the electronic part that are mounted in the handle section, the heart section and / or the head section of the ball game racket, preferably in a fixed way. In particular, it can be advantageous to install acceleration sensors in the head section and / or heart section of the ball game racket.

The electronic part preferably has a component among the following, or a combination of them: processor, memory, acceleration sensor, gyro sensor, magnetometer, temperature sensor, GPS sensor, communication interface, for example, for Wifi, Bluetooth or USB, power supply (for example, battery).

Preferably, the electronic part also has a housing that is suitable to be housed, preferably completely, in the handle section of the ball game racket. Preferably, all the electronic components of the electronic part are disposed within the housing and protected therefrom against external influences. The housing is preferably made of plastic, for example, injection molded. The housing has a longitudinal axis and preferably does not have rotation symmetry about this longitudinal axis, such that a tight introduction of the housing into the cavity of the handle section with a defined orientation of the housing in the section is guaranteed of handle. Preferably, the cross-section through the housing also does not have rotational symmetry, such that specular assembly of the electronic part can be prevented. For example, the housing can be configured rectangularly and, in addition, have a groove in each case on two opposite sides, the two grooves being configured differently and can be engaged with projections correspondingly configured differently in the cavity of the handle section . The housing can also have connections for external components, for example, the aforementioned electrically conductive connection with possible sensors and / or processors in the grip section of the ball game racket and / or communication interfaces for connection with other components external, such as a USB connection.

In a preferred embodiment, the electronic part or the housing has a communication interface at a first end and, at a second end opposite the first end, a connection in the handle section for connecting the electronic part with the sensor and / or processor When the electronic part is inserted into the cavity of the ball game racket, the second end points towards the side end of the head section cavity, in which direction they may be arranged in the ball game racket, for example, external sensors, while the first end points towards the end of the cavity on the side of the handle cap. In this way, the communication interface is particularly easily accessible to the user. If, for example, a USB connection is provided at this first end, the player can disassemble the handle cap of the ball game racket from the handle section and connect the electronic part, for example, with a USB stick, a laptop or smartphone, while the electronic part is still inside the cavity of the handle section. Additionally or alternatively, a housing area for a memory card (for example, MicroSD or similar) can also be provided at the first end, with the aid of which data collected can be transmitted to another device without removing the electronic part from the memory section. handle. Particularly preferably, the grip section of the ball game racket is configured such that an external component can be connected to the communication interface of the electronic part or the housing without removing the grip handle from the section of handle of the racket for ball game. For example, the handle cap may have a corresponding opening for the passage of a memory or USB connection that can preferably be closed. In addition, it is particularly preferred that the handle cap is part of the electronic part or of the housing. Thus, a cover or section that is suitable to serve as a handle cap can be provided at the first end of the housing for the ball game racket. Particularly preferably, the housing of the electronic part and the handle cap of the ball game racket or for the ball game racket are configured in one piece, for example, as an injection molded part. In this preferred embodiment, the communication interface is preferably provided in the handle cap. For example, a USB connection to connect the electronic part with a USB memory, a laptop or a smartphone is located in the grip cap. Additionally or alternatively in this regard, the housing may present at the first end a device (or part thereof) for wireless communication, for example, for Wifi, Bluetooth or the like. The first end of the housing or the complete grip cap is preferably configured such that wireless communication is not absorbed or dampened by the first end of the housing or the grip cap, or only sparingly. To this end, the first end of the housing or the handle cap may have corresponding openings and / or be configured of a correspondingly permeable material and / or particularly thin walls.

The housing for the electronic part is preferably suitable for housing a power source, for example, an accumulator or battery. Preferably, there is a corresponding opening at the first end of the housing, so that the accumulator or the battery can be changed without removing the electronic part from the cavity of the handle section. According to the invention, an electrical connection is provided at the first end of the housing with the aid of which the accumulator or the battery can be recharged. According to the invention, the accumulator or the battery or the corresponding connection for recharging is accessible without having to remove the grip cap from the grip section of the ball game racket. The housing may additionally or alternatively have one or more housing areas for memory cards that may also preferably be provided at the first end of the housing or the electronic part.

The assembly according to the invention composed of racket for ball game, ballast piece and electronic part offers several advantages over the state of the art. On the one hand, the electronic part according to the invention is easily replaceable, so that the electronic part can be replaced by an alternative or better electronic part or, for example, be temporarily removed for an update. In addition, the electronic part according to the invention is particularly easily accessible and allows trouble-free communication with both other components present in the ball game racket, such as sensors, and with external devices such as, for example, memories, PCs, laptops, tablets and smartphones. The housing of the electronic assembly in a stable housing protects the electronic assembly of the electronic part also when the part is not inside the cavity of the handle section. An integral piece composed of a housing and handle cap can be introduced and changed particularly easily.

The present invention is also directed to a ball game racket that can be retrofitted with an electronic part according to the invention. This ball game racket according to the invention has a corresponding cavity for housing the electronic part. In addition, a spare or ballast part that can be housed in the cavity is provided in accordance with the invention and ensures that the ball game racket according to the invention behaves exactly like a ball game racket with electronic part inserted.

The cavity is configured such that both the ballast part and the electronic part described above can be housed with a predefined orientation in a predefined position and be secured with this orientation in this position. The ballast piece in this respect has essentially the same measures and the same weight as the electronic part to ensure that the weight distribution of the ball game racket with inserted ballast piece is essentially identical to that of the game racket ball with electronic part inserted. In other words, the mass of the electronic part or its distribution is optimally harmonized with the corresponding ball game racket, so that it has optimal playing properties with an electronic part inserted. The ballast piece, which may alternatively be inserted into the handle section when an electronic part is not used, has in this respect the same properties, such that it can be played with the racket exactly the same with a ballast piece inserted as with electronic part inserted. This means that an update of the racket by means of an electronic part according to the invention does not modify the game properties.

It is preferred that the cavity has a damping material that is suitable for protecting the electronic part against shocks. This damping material may have one of the following materials or a combination of them: plastic foam, elastomers, thermoplastic elastomers, polyurethane, plastic with an elastic modulus of less than 1000 MPa. Preferably, a large part of the inner surface of the cavity and, particularly preferably, the entire inner surface of the cavity is coated with the damping material. The layer thickness of the damping material and the measurements of the electronic part (or of the ballast part) are chosen in this respect in such a way that a tight introduction of the electronic or ballast part into the cavity of the section is possible. of handle.

Preferably, the bearing for the electronic part constitutes a mechanical filter for vibrations, in particular a low pass filter. By selecting appropriate damping materials and corresponding layer thicknesses of the damping material, the limit frequencies of such a low-pass filter can be adjusted in such a way that the signal to be recorded by the sensors can reach the sensors arranged within the electronic part, but the noise is eliminated with the help of the low pass filter. In this preferred embodiment, the electronic part bearing would already contribute to the signal conditioning and, correspondingly, would be part of the technical measuring device.

The electronic or ballast part preferably has a volume of at least 3 cm3, more preferably of at least 5 cm3 and particularly preferably of at least 10 cm3. The electronic or ballast part preferably has a length between 4 cm and 16 cm, more preferably between 6 cm and 14 cm and particularly preferably between 8 cm and 12 cm. The electronic or ballast part preferably has a width between 15 mm and 35 mm, more preferably between 15 mm and 30 mm and particularly preferably between 18 mm and 22 mm. The electronic or ballast part preferably has a height between 10 mm and 30 mm, more preferably between 12 mm and 26 mm and particularly preferably between 14 mm and 22 mm. The electronic or ballast part preferably has a weight of between 10 g and 100 g, more preferably between 20 g and 60 g and particularly preferably between 25 g and 45 g.

Of course, the electronic or ballast part can be arranged in the cavity according to the invention.

Preferably, the ballast piece also has a housing, preferably an injection molded plastic housing. In addition, it is preferred that the ballast piece is integrally connected with the handle cap of the ball game racket. Particularly preferably, the casing of the ballast piece and the handle cap are injection molded from one piece. The casing of the ballast piece may be suitable to accommodate different masses with different mass distribution. Preferably, the ballast part or the cavity is configured such that the ballast part is detachably interlocked with the cavity or engaged in another way.

The assembly according to the invention offers different advantages with respect to the prior art. Since the costs for an electronic piece can be negligible depending on its performance, a player can first decide on a ball game racket that is basically able to accommodate a corresponding electronic piece, but which, however , equip it first with a piece of ballast. At a later time, you can additionally purchase the desired electronic part and replace the ballast part without problem with the electronic part. With the help of the set according to the invention, it is also possible that, for example, a tennis club has a racket with electronic part and club members possess a corresponding racket with ballast piece. Members can temporarily replace, for example, during training hours, the ballast piece on their racket with an electronic part and, for example, allow a corresponding analysis of their game technique. The electronic part can then be removed without problem and replaced by a ballast part. Since the electronic part and the ballast piece with respect to its dimensions, masses and mass distribution are essentially identical, with this exchange the playing properties of the racket are not modified.

The invention relates to a set of a ball game racket, an electronic part such as the one described above and a ballast piece like the one described above, the electronic part and the ballast part being able to be exchanged without modification of the racket specifications for ball game. In particular, in this respect the total racket mass, its balance and / or its so-called "swingweight" must remain constant after the change.

Preferred embodiments are described below with reference to the figures, none of the figures describing a handle cover in combination with an accumulator that can be charged inside the cavity without having to remove the handle cap from the racket for ball game. They show:

Figure 1 a sectional view, as well as an open view of a preferred embodiment of a handle section according to the invention, as well as an electronic part;

Figure 2 a partial section through the racket according to Figure 1;

Figure 3 a perspective view of the preferred embodiment according to Figure 1;

Figure 4 a top view of the handle section according to a preferred alternative embodiment;

Figure 5 a partial section through the handle section of a ball game racket of another preferred embodiment;

Figure 6 a partial section through the handle section of a ball game racket according to another preferred embodiment;

Figure 7 a partial section through the handle section of a ball game racket of another preferred embodiment;

Figure 8 a partial section through the handle section of a ball game racket of another preferred embodiment; Y

Figure 9 a partial section through the handle section of a ball game racket of another preferred embodiment;

Figures 1 to 3 show (at least partially) the assembly according to the invention.

The ball game racket basically has a head section for housing a stringing, of which in this case only the beginnings of the two arms 5a and 5b are represented in Figure 2, as well as a handle section 1. The handle section 1 has a cavity 3 for the replaceable housing of an electronic part 2. The cavity 3 is designed in this respect such that the electronic part 2 can be accommodated with a predefined orientation in a predefined position in the cavity 3 and can be held with this orientation in this position. In the preferred embodiment shown, this happens among other things also because the cross-sectional profile of the electronic part 2 does not have rotational symmetry, but in the example shown it has an octagonal shape. In this regard, the wall sections of the handle section 1 that form the cavity 3 of the ball game racket correspond in their shape to the outer shape of the electronic part 2 preferably such that the electronic part 2 can be inserted with precise adjustment in the cavity 3. Due to the absence of rotational symmetry, the electronic part 2 cannot rotate inside the cavity 3, which ensures that the signal, for example, of a gyroscopic sensor present in the piece electronics correspond to the orientation of the handle section 1 of the ball game racket.

In this respect, the internal shape of the electronic part does not need to correspond, as in the embodiment shown, with the outer shape of the handle section 1. On the contrary, the cross section of the cavity 3 or the electronic part 2 may have a completely different shape and size of the outer contour of the handle section 1. An example of this is provided by the preferred embodiment of Figure 4, in which the handle section 1 of the ball game racket It is filled with PU foam 6. Within this foam material 6 a cavity 3 is formed by means of a wall 7 which, for example, can be composed of carbon fiber, a cavity which in the case of the embodiment shown is approximately rectangular Correspondingly, also the electronic part (not shown) adapted for this cavity 3 has an essentially rectangular cross-sectional shape.

At the end of the handle cap side of the electronic part 2, a communication interface 4 is preferably provided. In this sense, it can be, for example, a plug-in USB connection by means of which the electronic part 2 can Be connected to an external device. Additionally or instead, a plug-in connection can be provided, with the help of which an accumulator that is in the electronic part 2 can be charged. This is also preferably possible via the USB connection.

Preferably, the cavity 3 or the wall sections that form the cavity 3 of the handle section 1 have a damping material that is suitable for protecting the electronic part 2 from shocks that usually occur during the game of the racket for game play. ball. This damping material 8 may be provided, as shown in the preferred embodiment of Figure 5, only by sections and may be preferably arranged in particular in the areas of the cavity 3 where the two ends of the electronic part 2 in the inserted state. In this way, the electronic part 2 can be accommodated in a particularly stable manner and be protected against shocks. Preferably, the damping material 8 is also arranged in this respect such that, as shown in Figure 5, the electronic part 2 is damped with respect to movements in the longitudinal axis of racket. Preferably, another damping material is provided between the handle cap not shown in Figure 5 and the electronic part 2.

The electronic part 2 of the embodiment shown in Figure 5 contains, in addition to a processor and a memory, also the necessary sensors for the corresponding application and, therefore, does not require a connection with another electronic assembly arranged in the racket for ball game.

According to another preferred embodiment, which is represented in Figure 6, only electronic assembly elements are found in electronic part 2, while at least one sensor is mounted on the ball game racket, preferably in a fixed manner . This sensor can also be mounted in a durable manner in the handle section or in the head section of the ball game racket, which also includes, in the context of the present invention, the heart section with the two arms and a possible bridge. In this embodiment, at the end of the head side of the electronic part and within the handle section are provided elements that engage each other of an electrically conductive connection 9 and which allow the electronic part to be electrically connected with the sensor and, optionally, other elements of the electronic assembly in the ball game racket. For this purpose, for example, a plug-in connection 9 can be installed in a corresponding place in the handle section 1 of the ball game racket from which one or more cables 10 lead to the sensor or the sensors and / or electronic components additional, such as antennas.

According to a preferred embodiment, the plug-in connection 9 serves not only for the electrical contact, but also for the mechanical connection of the electronic part 2 with the handle section 1 and / or for stabilization or fixing. Thus, for example, the damping material 8, which can be provided on the inner wall of the handle section 1 of the ball game racket, can secure the electronic part 2 against a radial movement or displacement with respect to the longitudinal axis of the handle section or optionally simultaneously also dampen the electronic part 2 in this direction against vibrations. The damping material 8 may be provided for this purpose, as shown in Figure 6, for example, in the form of two rings or essentially cover the entire inner wall that forms the cavity 3 of the handle section 1.

Alternatively, several strips of cushioning material 8 oriented longitudinally of the handle section 1 may be distributed around the perimeter of the cavity 3, preferably uniformly. Preferably, the damping material 8 does not have a pure damping function, but also serves as a low-pass filter for vibrations, so that the movements that must be measured from the racket arrive as a signal to the sensors found in the electronic part, noise or other unwanted signals being filtered on the contrary by the damping material. Along the longitudinal axis of the handle section 1 of the ball game racket, a mechanical fixation and, optionally, a damping can be carried out preferably by means of connection 9. The two complementary parts of connection 9 can be interlocked between yes, detachably, for example, by inserting the electronic part into the cavity 3. Alternatively, in this case a thread can also be provided for threading a joint section of the electronic part into a joint section in the section of handle or a union with the help of a bayonet, click, quick or similar closure.

The end of the handle section is covered with a so-called handle cap 11 as shown, for example, in Figure 7. In the present invention, a handle cap 11 of this type preferably closes the cavity 3, preferably contributing the handle cap 11 positioned to hold the electronic part 2 with a predefined orientation in a predefined position. For this, the end of the handle cap side of the electronic part 2, as this is shown in Figure 7, can protrude beyond the grip section 1 and be introduced with precise adjustment into the grip cap 11. Also the Handle cap 11 may have a damping material that is suitable for protecting the electronic part 2 against shocks generated during the game of the ball game racket. Preferably, such damping material is also provided between the cover 12 of the handle cap 11 and the end of the side of the handle cap of the electronic part 2.

The handle cap 11 and the electronic part 2 can represent independent elements. However, preferably the handle cap 11 and the electronic part 2 are joined together or configured in one piece as shown, for example, in the embodiment of Figure 9. This has the advantage that the introduction of the electronic part in the cavity of the handle section and the placement of the handle cap do not require independent work steps, but with a single and same movement, the electronic part 2 can be introduced in the cavity 3 of the section of handle 1 and the handle cap 11 closes the cavity 3, the electronic part 2 being stabilized at the same time with its predefined orientation in a predefined position and the handle cap 11 being fixed. The attachment of the grip cap 11 in the section of handle 1 of the ball game racket is preferably carried out in this respect by means of an interlocking of the handle cap ura 11 with corresponding projections or the like of the handle section 1. A particularly preferred technique for the corresponding fixation of the handle cap 11 in the handle section 1 of the ball game racket is described in detail in DE 102009058896 A1, whose content is referred to in its entirety.

Another preferred alternative for simultaneous mechanical stabilization of the electronic part 2 in the cavity 3 of the handle section 1 of a ball game racket and for the connection of the electronic part with an electronic assembly provided in the ball game racket Figure 9 is shown. In this case, the connection is formed by means of a spring contact 13 which, on the one hand, establishes an electrical contact between the electronic assembly of the ball game racket and a corresponding contact surface at the end of the head side of the electronic part and, on the other hand, using the immanent spring force of the spring 13, press the electronic part 2 against the cover 12 of the handle cap 11. Preferably, in this respect a damping material 8 is provided between the cover 12 of the grip cap 11 and the end of the handle cap side of the electronic part 2 In this way, the electronic part 2 is effectively protected against vibrations along the longitudinal axis of the handle section 1.

At the end of the handle cap side of the electronic part 2, different communication interfaces 4 and 14 may be provided, as shown by way of example in FIG. 8. In this respect, it may be, for example, a USB connection 4 with the help of which the electronic part 2 can be connected to an external device. Alternatively or additionally, a device 14 may be present for wireless configuration, for example, for connection with external devices via Wifi and / or bluetooth. By installing the communication interfaces 4 and 14 at the end of the handle cap side of the electronic part 2, a corresponding communication with external devices is also possible when the electronic part 2 is housed in the cavity 3 of the control section. handle 1. Preferably, the cover 12 of the grip cap 11 is configured in this respect such that wireless communication with the communication device 14 can take place through the cover 12.

In addition, it is preferred that a user interface is provided on the side of the handle cap that is suitable for communicating optically (for example, with the help of LED lights, a screen or the like) and / or acoustically (for example, with the help of a speaker) with a user. With the help of such a user interface, specific indications can be given to the player (such as "hitting now") or transmitting results of the evaluation of the measured data to the player (for example, "good hit").

Claims (14)

1. Set with: a ball game racket with a head section for housing a string and a handle section (1) with a handle cap (11), the handle section (1) having a cavity (3) for housing replaceable one electronic part (2); an electronic part (2) with a battery; and a ballast piece, the ballast piece having essentially the same mass as the electronic part (2); the cavity (3) being designed such that the electronic part (2) or alternatively the ballast part can be housed with a predefined orientation in a predefined position in the cavity (3) and can be held with this orientation in this position , presenting the cavity (3) and the electronic part (2) fasteners that engage each other; a connection being provided at a first end of the electronic part (2) with which the battery can be charged in the cavity (3) without having to remove the handle cap (11) from the ball game racket. 2. An assembly according to claim 1, wherein the ball game racket comprises at least one sensor, preferably an acceleration sensor and / or a gyroscopic sensor and / or a magnetometer and / or a temperature sensor, and / or a processor, and an electrically conductive connection is provided in the handle section and / or in the electronic part to connect the electronic part to the sensor and / or processor. 3. Assembly according to one of the preceding claims, the electronic part presenting a housing that is suitable for being housed in the grip section of the ball game racket, preferably completely, and an electronic assembly arranged in the housing. 4. Assembly according to claim 3, the housing at a first end presenting a device for wireless communication. 5. Assembly according to claim 4, a cover being provided at the first end of the housing that is suitable to serve as a handle cap for the ball game racket. 6. Assembly according to one of the preceding claims, the electronic part presenting at least one sensor, preferably an acceleration sensor and / or a gyro sensor. 7. Assembly according to one of the preceding claims, the ballast part having essentially the same mass distribution as the electronic part. 8. Assembly according to one of the preceding claims, the cavity being also suitable for replacing an electronic part, with measures that essentially correspond to those of the ballast piece with a predefined orientation in a predefined position, and holding it With this orientation in this position. 9. Assembly according to one of claims 2 to 8, the connection having a plug-in connection and / or a spring contact and the connection being preferably suitable for connecting the electronic part also mechanically to the handle section. 10. Assembly according to one of the preceding claims, the cavity presenting a damping material that is suitable for protecting the electronic part against shocks, the damping material preferably presenting one of the following materials or a combination thereof: plastic foam, elastomers, thermoplastic elastomers, polyurethane, plastic with an elastic modulus of less than 1000 MPa. 11. Assembly according to one of the preceding claims, the electronic or ballast part having a volume of at least 3 cm3, preferably at least 5 cm3, particularly preferably at least 10 cm3. 12. Assembly according to one of the preceding claims, the electronic or ballast part having a length between 4 cm and 16 cm, preferably between 6 cm and 14 cm, particularly preferably between 8 cm and 12 cm and / or the electronic or ballast part having a width between 15 mm and 35 mm, preferably between 15 mm and 30 mm, particularly preferably between 18 mm and 22 mm and / or having the electronic or ballast part a height between 10 mm and 30 mm, preferably between 12 mm and 26 mm, particularly preferably between 14 mm and 22 mm. 13. Assembly according to one of the preceding claims, the electronic or ballast part having a weight between 10 g and 100 g, preferably between 20 g and 60 g, particularly preferably between 25 g and 45 g. 14. Assembly according to one of the preceding claims, the electronic or ballast part being arranged in the cavity.