GOLF CLUB HEAD AND GOLF CLUBS

Description

TECHNICAL FIELD

[0001] The present invention relates to a club head for a golf club and a golf club with such a club head. STATE OF THE ART

[0002] Golf is a widespread sport in which both the golfer's performance and the technological properties of the golf club are of central importance. From a technological perspective, it is important that the golf ball can be hit as close to the hole as possible, with as much control and precision as possible, from a wide variety of environmental situations. Therefore, one goal in the development and design of golf clubs is to improve both directional accuracy and the achievable distance of the shots.

[0003] In addition to these purely technological requirements for the golf club, the golfer's playing ability is of crucial importance. Therefore, there is a great need to offer golfers opportunities to improve their performance. For a golfer to improve their playing skills, they must be able to understand their deficiencies. Measurement and analysis devices that enable the most accurate recording and analysis of a golfer's golf game can significantly support golfers in their training.

[0004] For example, WO 2009 / 118019 discloses a measuring device for attachment to a golf club. The measuring device wirelessly transmits data regarding the accuracy and swing movement to a mobile evaluation device, such as a cell phone, smartphone, or PDA. The device measures the accuracy on a sensor plate mounted on the clubface, as well as the direction of rotation, angular velocity, angular position, and duration of the backswing and forward swing phases of the clubhead.

[0005] DE 101 03 449 describes a golf club with a measuring device mounted on the club head for measuring the speed and / or speed profile of the club head. The maximum speed or speed profile during the stroke is displayed on a display device attached to the golf club.

[0006] Other technical options for recording or analyzing individual golf game performance, which are integrated into the clubhead itself, are known, for example, from US 2010 / 0093458. Physical parameters such as acceleration or impact forces are directly measured by sensors in the clubhead and used for golf swing analysis. For example, the clubface can have an outer metal layer and an inner metal layer, with pressure sensors arranged between them.

[0007] Detection of golf swing movements using a sensor module integrated into or mounted on the club head is known from WO 2005 / 118086. The sensor module includes a gyro sensor and acceleration sensors.

[0008] Golf clubs, all golf equipment in general, and any training accessories are often very expensive, especially due to their high technological requirements. Therefore, another golfer's need is to be able to protect their equipment against potential theft. At the same time, it's also in their interest to purchase genuine equipment that meets their quality standards, especially their technological requirements, rather than counterfeit.

[0009] WO 2006 / 124091 discloses an HF tag or RFID tag attached to the grip of a golf club. A device transmits a signal to the tag at regular intervals. As long as the tag remains within a certain distance from the device, the tag sends a signal back to the device. If the tag moves outside the specified distance, the device notifies the golfer.

[0010] In golf, the golf ball is often struck by the clubhead with great force. It is known that, as in tennis, the bouncing or rebounding of the golf club during or after impact can lead to what is known as "tennis elbow." In addition to this health aspect, the bouncing or rebounding of the golf club also affects the stroke, the immediate tee-off, and thus the entire movement and stroke profile, and therefore has a significant impact on the golfer's performance. Furthermore, the rebound and the swing of the golf club also result in the loss of impact energy that should be used to accelerate the ball. Any measuring or analysis devices attached to the golf club are also affected by this bouncing or rebounding, and depending on the extent of the bouncing or rebounding, inaccurate measurement or analysis results may result.

[0011] Due to the high impact energy, there is also a risk of damage to the sensor unit. A more robust sensor unit design could potentially reduce the risk of such damage. However, this typically increases the weight of the golf club, which can result in an unwanted change in the swing behavior. This can also increase the bouncing or rebounding of the golf club, thus increasing the risk of the aforementioned tennis elbow.

[0012] Since the greatest swing movement of a golf club occurs from the clubhead from the moment of backswing to the moment of impact, measuring or analysis devices mounted on it are highly suitable for capturing a golfer's club movement as completely as possible. However, since the clubhead is most exposed to the great force of the impact, the provision of measuring or analysis devices on the clubhead is associated with certain disadvantages and / or risks, for example due to the aforementioned bounce or reverberation. For example, bounce or reverberation can have an undesirable influence on the measurement or analysis results. Furthermore, measuring or analysis devices have their own weight, which can also lead to undesirable changes in the vibration behavior.

[0013] Furthermore, FR 2 689 407 discloses a golf club head with a hollow body, which can be made of a fiber-reinforced thermoplastic material and filled with a foam material. The interior space formed by the hollow body is closed at the front with a striking plate. At its rear, the hollow body has a recess into which a weighting element is inserted.

[0014] US 10,213,665 B1 discloses hollow golf club heads which have a recess on the underside for inserting plate-shaped weighting elements. PRESENTATION OF THE INVENTION

[0015] It is an object of the invention to provide a club head for a golf club that has improved impact behavior. This object is achieved by a club head having the features of claim 1.

[0016] A club head for a golf club is thus specified, which has a striking plate for striking a golf ball. The club head has a shell made of a first material, to which the striking plate is attached, a core made of a second material, at least partially surrounded by the shell, and at least one weighting element made of a third material. The second material of the core has a lower density than the first material of the shell. Furthermore, the third material of the weighting element has a higher density than the first material of the shell and / or than the second material of the core.

[0017] The different densities of the core and shell material enable the production of a club head with particularly low weight, which also offers good rebound and rebound absorption. Using the weighting element, the weight distribution of the club head can be optimized with regard to its impact behavior, and / or the weighting element can be used to achieve any predetermined weight specifications. The weighting element(s) can be arranged in particular at precisely defined and preferably previously calculated locations in the club head in order to achieve optimal impact behavior. By using at least one weighting element to increase the moment of inertia of the club head and / or change its center of gravity, for example, high directional accuracy and long hitting distances can be achieved.

[0018] The rebound and rebound dampening allows for ergonomic handling, increased ball acceleration due to better utilization of impact energy, and reduced trajectory dispersion. Furthermore, ergonomic handling protects the golfer and enables precise shot control. The specified clubhead is therefore characterized by particularly good impact characteristics.

[0019] In particular, it is possible that the second material of the core is softer and / or more elastic than the first material of the shell.

[0020] The shell may be partially surrounded by the striking plate. The shell completely encloses the core.

[0021] Preferably, the impact plate is attached directly to the outside of the shell and, in particular, rests directly on it. The impact plate is usually made of a relatively hard material, which is, in particular, harder than the material of the core and the shell. The impact plate can, for example, be made of a metal, such as iron.

[0022] It is preferable for the core to occupy a larger volume of the clubhead than the cover. However, it is also conceivable for the clubhead and cover to have a similar volume, which might be the case with a thin, delicate clubhead, for example.

[0023] The first material of the shell is a composite material, in particular a fiber-reinforced plastic. A composite material is understood here to be a composite material consisting of two or more joined materials that have different properties than the respective individual components. Basically, a composite material consists of a base material, referred to as the matrix, and a reinforcing material, such as a fiber. Example materials for a matrix material are thermoplastic materials such as polyetheretherketone (PEEK), thermosetting materials such as resins, etc. Examples of fibers include materials such as carbon fibers, glass fibers, aramid, Kevlar fibers, etc. Those skilled in the art are aware of a multitude of suitable composite materials for a club head.

[0024] However, the shell of the club head can also be made of other materials, such as steel, amorphous metals, ceramics, carbon, carbon fibers and other fiber materials.

[0025] As already mentioned, the second core material has a lower density than the first shell material. Thus, the second core material can be a foam material. A foam material is a substance that is usually synthetically produced and has a cellular structure with a low density. Materials suitable for foaming and for the present application include many plastics in the sense of organic, polymeric solids such as thermoplastics, thermosets, or elastomers, which can reduce their volume under pressure, thus exhibiting compressibility.

[0026] The second core material can also be a gaseous material, such as air. In this case, the shell encloses a hollow space, and the gaseous material filling this hollow space forms the core. This makes the core particularly lightweight. Surprisingly, club heads with foamed or gaseous cores have been found to exhibit particularly favorable impact characteristics.

[0027] In a particularly preferred embodiment, the club head additionally has at least one sensor unit which is arranged at least partially inside the core.

[0028] By arranging the at least one sensor unit at least partially inside the core, it is well protected and has minimal influence on the impact behavior. The sensor unit is thus at least partially surrounded by the second material of the core, but preferably it is even arranged entirely inside the core, i.e., completely surrounded by the second material of the core. Advantageously, at least a large part of the sensor unit is arranged inside the core.

[0029] The lower density and the preferred compressibility of the core dampen or attenuate the bouncing or reverberation caused by the great force of the impact, thus protecting the sensor unit from these unwanted forces. By dampening the impact energies acting on the sensor unit, precise measurement and analysis of the impact dynamics is also enabled.

[0030] It is conceivable that the sensor unit comprises, for example, a signal generator and / or an electronic unit or signal evaluation unit, wherein the signal generator rests on the impact plate and the electronic unit or signal evaluation unit is arranged at least partially inside the core. Preferably, a predominant volume portion of the sensor unit, and in particular of the electronic unit belonging to the sensor unit, is arranged inside the core.

[0031] Due to the low density of the second material of the core in which the at least one sensor unit is arranged, the teeing forces on the sensor unit that arise when the golf ball is hit are dampened, which enables precise recording and / or analysis of the club movement during the backswing and the teeing swing.

[0032] The core can partially or completely enclose the sensor unit. Preferably, however, the sensor unit is at least completely enclosed by the shell.

[0033] The sensor unit can have at least one sensor for detecting the impact dynamics. The sensor for detecting the impact dynamics can be an angular velocity sensor and / or an acceleration sensor and / or a magnetic sensor. It can also be a sensor for measuring impact accuracy, which is attached, for example, to the faceplate of the golf club. It is conceivable for the sensor unit to have two or more sensors for detecting the impact dynamics, and for one such sensor to then be an angular velocity sensor and another sensor to be an acceleration sensor or a magnetic sensor.

[0034] The sensor unit can have at least one sensor to ensure security against counterfeiting. The sensor to ensure security against counterfeiting can be designed as an RFID transponder capable of transmitting and / or receiving RF signals. It is also conceivable for the sensor unit to have two or more sensors to ensure security against counterfeiting.

[0035] RFID refers to "radio-frequency identification," a well-known technology for transceiver systems for contactless identification or localization of objects using radio waves. An RFID system typically consists of a transponder located on or in the object and containing an identifier, as well as a suitable reader for reading this identifier.

[0036] For example, the sensor unit can have one or more sensors for detecting impact dynamics, or one or more sensors for ensuring security against counterfeiting. However, the sensor unit can also have one or more sensors for detecting impact dynamics and one or more sensors for ensuring security against counterfeiting. In other words, the sensor unit can have any number of sensors for detecting impact dynamics and / or for ensuring security against counterfeiting.

[0037] The sensor unit may also comprise one or more sensors in the form of one or more chips, such as in particular RFID transponders.

[0038] Alternatively or additionally, the sensor unit can comprise a location sensor, in particular a Global Positioning System (GPS) sensor, to detect the swing and / or the location of the player. The location sensor can be combined with another sensor, e.g., located in the shaft or grip of the golf club, to determine the position of the club or club head. An inclination sensor can also be provided in the club head, shaft, or grip.

[0039] The signals detected by the sensor unit can be transmitted to a signal evaluation unit. For example, the at least one sensor for recording stroke dynamics can record the club movement during the backswing and downswing, with an acceleration sensor measuring the acceleration or an angular velocity sensor measuring the position of the club head. These measurement parameters or data can be transmitted, for example, via wire, Bluetooth, or Wi-Fi to an analysis device such as a handheld device, e.g., a mobile phone or an iPad. This allows the handheld device to evaluate, for example, stroke consistency or stroke accuracy to support the user's learning process.Similarly, security information can be transmitted or evaluated using the at least one sensor or chip to ensure counterfeit security, for example, by using a reader that generates a high-frequency alternating electromagnetic field to which the RFID transponder is exposed and thereby activated. The thus activated RFID transponder, preferably in the form of an activated microchip in the RFID tag, influences the electromagnetic transmission field of the reader and thus allows conclusions to be drawn regarding counterfeit security.

[0040] The sensor unit can be permanently mounted in the core of the club head, making it impossible to remove from the club head without causing damage. However, it is also conceivable for the sensor unit to be non-destructively removable. For example, the sensor unit could be removed non-destructively from a modular club head that was assembled using connection techniques such as screwing or plugging. With a modular design of the club head or the club itself, it would also be possible to replace the individual modules.

[0041] The club head can additionally have a power supply unit for supplying the sensor unit with power, wherein the power supply unit can be arranged in the club head, preferably in the core, in a fixed or removable manner. For example, the power supply unit can be a battery which is fixedly arranged in the club head and cannot be removed. Or it can be a battery which can be removed from the club head and recharged or replaced with a new battery. Such a power supply of the sensor unit can be referred to as active operation of the sensor unit. It is also conceivable here to arrange the power supply unit not in the club head, but at a different location in the golf club, for example in the shaft.It is also conceivable that an autonomous energy supply of the sensor unit takes place, for example by the movement of the club head or the golf club, the flywheel induces an induction voltage in an induction system, which can be made available to the sensor unit as an energy supply.

[0042] However, it is also conceivable to operate the sensor unit passively, i.e., to supply it with a power supply located outside the club head. This way, at least one of the sensors, for example, an RFID transponder, could be powered by the signals from an analysis or reading device. Preferably, a capacitor could be charged by induction, similar to a transformer, using a coil as a receiving antenna.

[0043] As already mentioned, the sensor unit often has its own weight, which can negatively impact the swing dynamics or lead to undesirable changes in the vibration behavior. The at least one weighting element can serve, among other things, to compensate for any changes in the vibration behavior caused by the sensor unit. The weighting element(s) are preferably designed and arranged in the club head in such a way that they compensate for the influence of the sensor unit on the swing dynamics. Conversely, it is also conceivable for the sensor unit itself to form a weighting element, which is designed and arranged in such a way that the swing behavior of the club head is specifically improved.

[0044] The weighting element is preferably arranged immovably in or on the club head. However, the club head can additionally have a cavity, with the weighting element being arranged displaceably within the cavity.

[0045] A movable weighting element stores kinetic energy during impact. This energy is released again when the club head hits the ball, resulting in the club's deceleration, as the weighting element moves freely in the direction of impact. This energy is transferred from the club head to the ball, in addition to the impact energy transferred from the club head to the ball. In other words, the force acting on the club as "rebound momentum" is compensated for when it impacts the ball, and an additional force equivalent to the rebound contributes to the ball's acceleration, enabling particularly long shot distances.

[0046] The weighting element is arranged entirely within the shell. Preferably, the weighting element is arranged entirely or at least partially, in particular largely, within the core. The weighting element is preferably arranged in the region of an underside of the club head.

[0047] The weighting element can be designed according to a desired weight distribution, for example semicircular or ring-shaped, and can be arranged in the area of ​​the underside or in the center of the club head.

[0048] According to a particularly preferred embodiment, a first weighting element and a second weighting element are provided, each arranged laterally to the striking plate. In this case, the striking plate is advantageously arranged between the first and second weighting elements. Advantageously, the two weighting elements in this embodiment are each attached to the outside of the shell. This not only has the advantage of optimizing the weight distribution with regard to the striking behavior, but also that the weighting elements are particularly easy to install and can, for example, be replaced with others.

[0049] The weighting element can be located only in the shell, only in the core, or both in the shell and the core. As already mentioned, the lower density of the second core material compared to the higher density of the first shell material provides rebound or rebound dampening, especially when the club head impacts the ball, which also has a corresponding effect on a weighting element. This means that while a weighting element, on the one hand, leads to additional force upon impact and, accordingly, to an additional "rebound impulse," the different densities of the shell and core materials enable dampening in the sense of cushioning.The effect of such a recoil impulse on any existing sensor unit and on the golfer can be reduced or even prevented, so that despite the additional recoil force of the weighting element, precise recording and / or analysis of the club movement as well as ergonomic handling are still possible.

[0050] Analogous to the arrangement of a weighting element according to the type described above, a cavity can be arranged in the shell and / or in the core, preferably in the region of an underside of the club head, and the weighting element can be composed of several components, wherein the several components are preferably a powder or a pellet mixture. However, it is also conceivable for the weighting element to be present in the cavity as a liquid, or for the weighting element to be a one-piece, solid weighting element that is movably arranged in the cavity. In other words, a cavity can be formed in the club head which is filled with a solid mass, e.g. a foam material, or which is filled with a movable mass, e.g. powder, pellets or a liquid.

[0051] The third material of the weighting element can be a metal or an alloy, particularly if it is formed in one piece. The metal can be lead or tungsten, for example. A weighting element in the form of a powder or a pellet mixture can have a high-density component, for example tungsten, and a compound component, for example copper or tin. A number of suitable materials for such weighting elements are known to those skilled in the art. The weighting element, such as a powder, a pellet mixture, or a liquid, arranged in a cavity, slides during the winding movement within the cavity, initially from the club head towards the shaft, and then slides back into the club head during the swing.This results in a higher clubhead speed during the swing and enables high directional accuracy and long shot distances.

[0052] To customize the swing weight of a golf club, the weighting element can be removed from the clubhead without damaging it. This allows the club to be customized to the golfer. The weighting element can be selected to create a high moment of inertia while simultaneously achieving the desired dynamic response at impact.

[0053] In general, it should be understood that one or more weighting elements can be arranged inside the shell and / or inside the core and / or that one or more weighting elements can be arranged in one or more cavities inside the shell and / or inside the core.

[0054] For example, if a weighting element is located only inside the core, the shell can completely enclose the core immediately adjacent to it. If, for example, a weighting element is located inside the core and inside the shell, the shell only partially encloses the core immediately adjacent to it, namely in those areas where there is no weighting element between the core and the shell.

[0055] A golf club is also specified, which has a club head according to the above description. The golf club can have a shaft, a grip, and a connecting piece, wherein the shaft can be attached to the club head via the connecting piece.

[0056] Further embodiments are specified in the dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Preferred embodiments of the invention are described below with reference to the drawings, which are for illustrative purposes only and are not to be construed as limiting. In the drawings: Fig. 1 shows a cross-section through a club head according to a first embodiment; Fig. 2 shows a longitudinal section through a golf club with a club head according to a second embodiment; Fig. 3 shows a cross-section through a golf club with a club head according to a third embodiment; Fig. 4 shows a cross-section through a golf club with a club head according to a fourth embodiment; Fig. 5 shows a longitudinal section through a golf club with a club head according to a fifth embodiment not according to the invention; Fig. 6 shows a longitudinal section through a golf club with a club head according to a sixth embodiment not according to the invention; Fig. 7 shows a cross-section through a golf club with a club head according to a seventh embodiment; Fig. 8 shows a cross-section through a golf club with a club head according to an eighth embodiment; Fig.Fig. 9 is a perspective view of a club head according to a ninth embodiment, not according to the invention, without a striking plate; Fig. 10 is an exploded perspective view of the club head of the . Figure 9 , with striking plate; and Fig. 11 an exploded view from the front of the club head of the Figure 9 , with striking plate. DESCRIPTION OF PREFERRED EMBODIMENTS

[0058] In the Figures 1 to 11In each case, a club head 1 for a golf club is shown, which has a shell 2 made of a first material and a core 3 made of a second material, which is completely or at least partially surrounded by the shell 2. On the outside of the shell 2, a striking plate 4 for hitting a golf ball is attached. A sensor unit 5 is arranged inside the core 3, wherein the core completely or at least partially encloses the sensor unit 5. The core 3 occupies a larger volume of the club head 1 than the shell 2. In or on the club head, at least one weighting element 6 or 6a, 6b made of a third material is arranged, wherein according to the Figures 1 to 11 Different designs and arrangements of the weighting element(s) are possible. Identical or similarly designed elements with the same or similar function are Figures 1 to 11 each provided with the same reference numerals.

[0059] The Figure 1 shows a first embodiment of the club head 1, in which the sensor unit 5 and the weighting element 6 are each arranged centrally in the area of ​​an underside of the club head 1. The sensor unit 5 is completely enclosed by the core 3 and is located in the area of ​​its underside directly next to the weighting element 6, which is immovably arranged between the shell 2 and the core 3. The weighting element 6 is designed and arranged to ensure optimal impact behavior. The weighting element 6 is essentially rectangular and extends along the entire width of the core 3.

[0060] In the second version of the club head 1 shown in Figure 2The sensor unit 5 is again located centrally in the area of ​​an underside of the club head 1 and is completely enclosed by the core 3. The core 3 is T-shaped, and the weighting element 6 is U-shaped and extends along the entire width and over a portion of the height of the core 3, so that the core is partially received in or enclosed by the channel formed by the U-shaped configuration of the weighting element 6. Both the core 3 and the weighting element 6 are completely enclosed by the shell 2.

[0061] In the third version of the club head 1 shown in Figure 3the sensor unit 5 and the weighting element 6 are arranged on one side of the club head. The weighting element extends in an L-shape over a partial area of ​​the height of the shell 2 and the core 3 in the area of ​​the front of the club head and protrudes into the shell 2 and the core 3 in this partial area. The sensor unit 5 is completely enclosed by the core 3 and is located close to the weighting element 6. The weighting element 6 has an L-shaped profile with two legs at right angles to one another, which together span an area in which the sensor unit 5 is arranged. This arrangement allows the sensor unit 5 to be additionally protected from forces acting on the club head 1. The striking plate 4 is attached to the front of the club head 1 and also has an L-shaped profile, which extends along the entire underside and on one side along the entire height of the club head 1.

[0062] In Figure 4 A club head 1 for a golf club is shown, in which a substantially L-shaped weighting element 6 extends along an underside of the core 3 and along the entire height of the striking plate 4 between the shell 2 and the core 3. The sensor unit 5 is arranged centrally in the area of ​​the underside of the club head 1 and is completely enclosed by the core 3.

[0063] The Figures 5 and 6 each show a club head 1 with a weighting element 6. In these figures, neither the shell nor the sensor unit of the club head 1 is visible. However, as with the embodiments of the Figures 1 to 4 In each case there is a shell which at least partially surrounds a core, and as in the embodiments of the Figures 1 to 4Each has a sensor unit, which is located at least partially inside the core. In contrast to the club heads 1 of the Figures 1 to 4 , the flat weighting element 6 is on the club heads 1 of the Figures 5 and 6 not arranged inside the shell 2, but attached to its underside.

[0064] The weighting element 6 of the Figure 5 The embodiment shown is designed as a flat plate. The weighting element 6 of the Figure 6 is also flat on a side facing away from the shell 2 and has a projection on a side facing the shell 2, which extends into the shell 2. The flat side of the weighting element 6 extends parallel to the outside of the shell 2. The Figure 6The weighting element 6 shown is thus substantially T-shaped, wherein the free middle leg of the T-shaped weighting element 6 is received in a recess of the shell 2 which is substantially U-shaped in longitudinal section.

[0065] The Figures 7 and 8 The versions shown differ from those of the Figure 1 in that the sensor unit 5 is not completely, but only partially, arranged inside the core 3. In these embodiments, however, a large part of the sensor unit 5 is still arranged inside the core 3, i.e., a large part of the sensor unit 5 is enclosed by the core 3.

[0066] When executed according to Figure 7The sensor unit 5 rests with its front side on the inner surface of the shell 2 in the area of ​​the impact plate 4, but is otherwise enclosed by the core 3. The sensor unit 5 is thus completely enclosed by the shell 2, but only partially by the core 3.

[0067] When executed according to Figure 8 The sensor unit 5 rests with its front side, which is usually formed by a signal generator, on the inner surface of the impact plate 4, but is also at least partially enclosed by the core 3. In contrast to the embodiment according to Figure 7 However, in the present embodiment, the sensor unit 5 is not completely enclosed by the shell 2, but rather penetrates through the shell 2 with its area facing the impact plate 4. Thus, the sensor unit 5 is also only partially enclosed by the core 3, although a predominant volume portion of the sensor unit 5 is nevertheless located in the core 3.

[0068] In the Figures 9 to 11 Another version of a club head 1 is shown. A shell 2 also encloses a Figures 9 to 11 The core is preferably formed by a foam material or a gaseous material, such as air. In the latter case, the shell 2 encloses a cavity, and the air filling this cavity forms the core. The material of the core preferably occupies a larger volume than the material of the shell 2.

[0069] The Figures 9 to 11The embodiment shown preferably, but not necessarily, has a sensor unit 5, which can be arranged, for example, in the form of a sensor plate between the shell 2 and on a striking plate 4 attached to the front of the shell 2. However, the sensor unit 5 is particularly preferably arranged at least partially, in particular completely, inside the core. It can, for example, be attached to an inner surface of the shell 2, in particular to the inner surface of the front of the shell 2, or, in particular if the core is made of a foam material, be arranged completely inside the core.

[0070] In the present embodiment, the club head 1 has two weighting elements 6a and 6b, which are attached to the outside of the shell 2, laterally to the striking plate 4. Outwardly projecting pins are formed on the shell 2 to hold the weighting elements 6a and 6b. These pins are inserted into correspondingly provided openings when the weighting elements 6a, 6b are attached. Alternatively or additionally, the weighting elements 6a, 6b can also be glued and / or screwed to the shell 2. The combination of the weighting elements 6a, 6b arranged laterally to the outside of the striking plate 4 with a core made of a foam material or a gaseous material has proven particularly advantageous with regard to the impact behavior of the golf club.

[0071] In contrast to the previous versions, the striking plate 4 here does not have an L-shaped profile, but rather a flat overall profile. Instead, a metal sole plate 9 is attached to the shell 2 to reinforce the underside of the club head 1.

[0072] As in the Figures 2 and 3 and 5 and 6, the club head 1 is connected to a shaft 8. The club head 1 is the Figures 2 , 5 and 6 formed in one piece with the shaft 8, while the club head 1 of the Figures 3 and 9 to 11 is attached to the shaft 8 via a hosel 7.

[0073] Even if in all embodiments, which are in the Figures 1 to 11 Since a sensor unit 5 is present in the club head of each of the two shown clubs, it is certainly conceivable to provide these club heads without the sensor unit. The club heads would then still exhibit particularly good impact performance. LIST OF REFERENCE SYMBOLS

[0074] 1 club head 6, 6a, 6b Weighting element 2 Peel 7 Hosel 3 core 8 shaft 4 striking plate 9 sole plate 5 Sensor unit

Claims

1. A golf club head (1) for a golf club, comprising a striking plate (4) for striking a golf ball, a shell (2) made of a composite material, to which the striking plate (4) is attached, a core (3) which is at least partially surrounded by the shell (2) and is made of a foamed material or of a gaseous material, in particular air, and at least one weighting element (6) made of a further material, wherein the foam material of the core (3) has a lower density than the composite material of the shell (2), wherein the further material of the weighting element (6) has a higher density than the composite material of the shell (2) and / or than the foam material or the gaseous material of the core (3), characterized in that the shell (2) completely encloses the core (3), and that the at least one weighting element (6) is arranged completely within the shell (2).

2. The club head (1) according to claim 1, wherein the club head (1) additionally comprises at least one sensor unit (5) which is arranged at least partially in the interior of the core (3).

3. The club head (1) according to claim 2, wherein the core (3) completely encloses the sensor unit (5).

4. The club head (1) according to one of claims 2 or 3, wherein the sensor unit (5) comprises at least one sensor for detecting the dynamics of the stroke, which is preferably an angular-velocity sensor and / or an acceleration sensor and / or a magnetic sensor.

5. The club head (1) according to one of the claims 2 to 4, wherein the sensor unit (5) comprises at least one sensor for ensuring protection against forgery, which is preferably designed as an RFID transponder suitable for transmitting and / or receiving RF signals.

6. The club head (1) according to one of the claims 2 to 5, wherein the sensor unit (5) can be removed from the club head without damage.

7. The club head (1) according to one of the claims 2 to 6, additionally comprising an energy supply unit for supplying the sensor unit (5) with energy, wherein the energy supply unit is arranged in the club head, preferably in the core (3).

8. The club head (1) according to one of the preceding claims, wherein the core (3) takes up a larger volume of the club head than the shell (2).

9. The club head (1) according to one of the preceding claims, wherein the weighting element (6) is arranged immovably in or on the club head, or wherein the club head additionally comprises a cavity and wherein the weighting element (6) is displaceably arranged in the cavity.

10. The club head (1) according to one of the preceding claims, wherein the weighting element (6) is arranged in the interior of the core (3).

11. The club head (1) according to one of claims 1 to 9, wherein a first weighting element and a second weighting element are provided, which are each arranged laterally to the striking plate (4).

12. A golf club comprising a club head (1) according to one of the preceding claims.