WO2016015906A1

WO2016015906A1 - Ball-striking device and method for producing same

Info

Publication number: WO2016015906A1
Application number: PCT/EP2015/062544
Authority: WO
Inventors: Hubert Nagler
Original assignee: Tec Sportmanagement Ag
Priority date: 2014-07-29
Filing date: 2015-06-05
Publication date: 2016-02-04
Also published as: EP3174610A1; JP2017523894A; US20170203163A1; EP3174610B1; DE102014110656A1; CN106794369A

Abstract

The present invention relates to a ball-striking device (1), in particular a tennis, squash or badminton racket, with a head frame (2) which encompasses a striking surface, is of hollow design and is produced from plastic, in particular from a fibre-reinforced plastic, and with a shaft which is integrally formed on said head frame and has a grip, wherein the striking surface (12) is defined by at least one string (8) which is tensioned in a criss-cross manner and which forms string portions fastened substantially parallel to one another on the head frame, wherein the string portions are anchored on the head frame (2) via retainers (20) which are fastened on the inner side of the head frame in such a way that they each extend substantially perpendicularly to the striking surface, with the result that the ends (10) of the string portions that are clamped in the retainers (20) can be deflected laterally when striking a ball. With the aim of specifying such a ball-striking device and a method for producing same in which the string portions are anchored on the head frame via retainers which can be arranged precisely and easily in the head frame and are also suitable for a mass production process, provision is made for the retainers (20) to be open to one of the two sides of the striking surface (12) or to be freely accessible from one of the two sides of the striking surface (12) in order to clamp in the string defining the striking surface.

Description

Balischlaggerät and method for its preparation

description

The present invention relates to a ball impact device, in particular a tennis, squash or badminton rackets, comprising a head face comprising a striking surface, which is hollow and made of plastic, in particular of a fiber-reinforced plastic, and a molded handle with handle, wherein the striking surface is determined by at least one cross-stretched side, which forms substantially parallel to each other on the head frame mounted string sections, wherein the anchoring of the string sections on the head frame via brackets, which are fixed to the inside of the head frame so that they are each substantially perpendicular to Extend striking surface, whereby the clamped in the brackets ends of the string sections are laterally deflected upon impact of a ball. Furthermore, the invention relates to a method for producing such a ball impact device.

Hereinafter, the term "ball impact device" or "bat" for the purpose of the present invention, in particular tennis, squash or badminton rackets to be understood; However, the meaning of the term is not limited to this as such, but refers to any type of ball impact devices, which have a striking surface and the striking surface is determined by at least one cross-stretched string. A ball impact device of the type mentioned is known for example from EP 2 164 579 Bl. This has a head face comprising a striking surface, which is formed hollow and made of a fiber-reinforced plastic, and to which a shaft is formed with handle, wherein the striking surface is determined by at least one cross-stretched string, which are substantially parallel to each other ' formed on the head frame strings sections forms. The anchoring of the string sections on the head frame via a plurality of arcuate headband, which are laminated on the inside of the head frame such that they each extend substantially perpendicular to the club face, whereby the clamped in the brackets ends of the string sections are deflected laterally upon impact of a ball. In this known from the prior art solution, two brackets are required per clamped end of a string section to realize two parallel string sections of a defined distance. Technically, the famous racket meets all requirements. However, it is difficult to correctly label the headband aligned with each other. In addition, the stringing of such a racket takes a relatively long time, since the string must be threaded through a variety of brackets and stretched in sections. In particular, it has been shown that the covering of the racket takes longer than the covering of conventional rackets, in which the string is passed through holes on the head frame.

It is therefore an object of the present invention to provide a ball impact device and a method for its production, in which the anchoring of the string sections on the head frame via Haltebügei that can be arranged precisely and easily in the head frame and are also suitable for a mass production process.

This object is achieved by a ball impact device with the features of claim 1 and in terms of the method by the subject of claim 12. Accordingly, it is provided that a ball impact device is specified, in which the headband are open to one of the two strings of the club face open or from one of the two strings of the club face for clamping the string defining the striking surface freely accessible. The solution according to the invention has a number of significant advantages over the ball impact devices known from the prior art. Thus, by the open to one of the two sides of the face flat headband or in that the headband for clamping the impact surface defining string is freely accessible, achieved that a covering of the ball impact device is quick and easy to make. In addition, a high-precision string pattern is achieved, which has excellent playability.

Advantageous developments are specified in the subclaims.

Accordingly, it is provided that for anchoring the string sections on the head frame, a set of brackets is provided, the first number of brackets with a circumferentially direction of the head frame first predetermined length, at least a second number of brackets with a circumferentially direction of the head frame second predetermined length and optionally comprising at least a third, fourth and fifth number of retaining clips having a third, fourth and fifth predetermined length in the circumferential direction of the head frame. Ball impact devices usually have an elliptical shape, on the two major semi-axes starting from the center is in each case the first number of headband with the smallest predetermined length. These determine the size of the usually consisting of mostly equilateral rectangles string pattern. Due to the elliptical shape of the head frame, retainers with circumferential length of the head frame of different length allow a substantially same and exact string pattern. At the same time, an arrangement of a plurality of retaining clips, as known from EP 2 164 579 B1, is simplified to the effect that a single retaining clip according to the invention is sufficient to define two parallel string sections.

The string is the only material that comes into direct contact with the ball. The stringing therefore decides on game characteristics such as control, spin, power, feel and comfort of the ball impact device. A high stringing weight guarantees more control, but requires more power; softer clothing can be used to create greater power and maximum power of the ball with less effort. A soft covering is approximately between 18 and 21 kg, a normal covering is between approximately 22 and 25 kg and a hard covering is approximately between see 26 and 28 kg. While there are a variety of string patterns (for example, 14x16, 14x18, 16x15, 16x16, 16x17, 16x18, 16x19, 16x20, 18x18, 18x19, 18x20 and 18x21, where the first digit of the number of longitudinal strings and the second digit determines the number of cross strings ), the 16x19 and 18x20 string patterns differ in that 16x19 usually provides more power and spin, while 18x20 provides more control with longer string durability.

Head frame sizes are often in the classes midsize (<97 sq inch / 625 cm ^2), Midplus (98-105 sq inch / 630-675 cm ^2), oversize (106-115 sq inch / 680-740 cm ²⁾ and Super oversize (> 116 sq in / 750 cm ² ). Depending on the head frame size, the number of strings and the type of clothing can vary. For the purposes of the invention, the number and used width of the headband depends on the head frame geometry and specifically adapted to this.

Preferably, the headband used according to the invention each comprise in the state attached to the head frame a protruding from this bracket section and an anchored within the head frame mounting portion. The outstanding bow section is used for easy and precise hooking of the string during stringing. The attachment portion which within the

Head frame lies, offers the advantage of a secure anchoring of the retaining bracket in the head frame.

In order to further improve the anchoring of the fastening section and thus the load capacity of the retaining clip, the fastening section of each retaining clip has longitudinal and transverse structures for positive and non-positive anchoring within the head frame Irrespective of the design of the stirrup portion, for example, either open to one side or freely accessible from one side, in particular hook-shaped, preferably oval, a longitudinal section extending into the head frame, on which transverse webs or projections are formed hook-shaped, or closed on both sides, in particular ring-shaped, the attachment portion of each support bracket is preferably embedded between two frame halves defining the head frame.This offers the advantage that by using prefabricated semi-finished a head frame with common means quickly and easy to produce By appropriate embedding results in a durable anchorage of the retaining bracket in the head frame, which withstands even high repeated loads easily.

Preferably, it is provided that the head frame is formed by two the frame halves defining tubular prepregs approximately at the height of the club face a double-walled circumferential approximately parallel to the club surface extending transverse web, wherein the mounting portions of the headband each defining between the double-walled crosspiece Wall sections of the two tube-like prepreg embedded and thus firmly anchored. As a result, a positive and positive anchoring of the headband in the head frame is obtained in a simple manner. When the prepregs are inflated, they form fit against the attachment sections of the retaining clips. This form-fitting is fixed by curing, so that a long-lasting and robust anchoring of the headband in the head frame is created.

It has proven technically advantageous when the inner radius of the headband is in a range of 0.5 to 1.9 mm, in particular 0.5 to 1.0 mm. This radius is adapted to the diameter of commonly used strings, so that the clamped on the brackets ends of the string sections are deflected laterally upon impact of a ball and excessive wear due to friction of the string is avoided during the Auslenkvorgangs. For this purpose, it is also conceivable that the surface of the headband is treated on the side facing the string with a surface finishing process, which reduces the coefficient of friction of the interacting with the string surface of the headband.

It is preferably provided that the first predetermined length (LI) of the first number of holding straps lies in a range of 9-11 mm and / or the first number of holding straps of the first predetermined length (LI) is 12-20, in particular 16 , and / or the second predetermined length (L2) of the second number of holding straps is in a range of 10 - 11 mm and / or the second number of holding straps of the second predetermined length (L2) is 6 to 14, in particular 10, and / or the third predetermined length (L3) of the third number of brackets is in a range of 11-13 mm and / or the third number of brackets of the third predetermined length (L3) is 2 to 10, in particular and / or the fourth predetermined length (L4) of the fourth number of shrouds is in a range of 16 - 18 mm and / or the fourth number of sheaths in the fourth predetermined length (L4) is 2 to 8, especially 4 , and / or the fifth predetermined length (LS) of the fifth number of brackets is in a range of 20 - 22 mm and / or the fourth number of brackets of the fourth predetermined length (L5) is 1 to 4, in particular 2. By means of retaining brackets formed in this way, the best possible adaptation of the clothing pattern to the shaping of the head frame, which may generally be more or less pronouncedly elliptical, is achieved in order to achieve a desired clothing pattern. Furthermore, this creates an exact, rectangular string pattern within the main beat area (sweet spot). The main beat area is the area of the string pattern in which the string is determined by substantially identical or equally sized string squares. Outside this range, the cross-stretched string sections each limit more or less long rectangular fields.

When manufacturing a racket according to the invention it can, in particular for higher quantity, be advantageous to manufacture this in a machine or teilmaschinellen method _* by the retaining clips of predetermined length which have been set respectively with a provided for the purpose of typing characters, in particular visually and / or haptically or also readable in any other readable or machine-interpretable form, representing the type of a predetermined length (LI; L2; L3; L4; L5). However, this can also be advantageous in the case of manual processing and in particular when equipping a holding device for the holding clamps, since rapid and targeted equipping of the holding device with Haitebügein provided at the respective position is made possible. For easier positioning of the headband these are preferably first inserted into an insertion device, and then positioned together with the insertion device relative to the holding device for the headband, before subsequently the headband are each fixed in the region of their temple sections within the holding device. By inserting is avoided that the headband when fixing the same in the holding device change its predetermined position, eg slip. According to the invention, a lateral gap (S) is defined between the retaining clip and the head frame, the width of this gap being in the range from 1.0 to 2.0 mm, in particular in a range from 1.5 to 1.7 mm. This gap allows a lateral clamping of the string and is dimensioned so that the string can be easily hooked to the strap section of the headband.

Further, it is possible that the ends of the headband, over which the striking surface defining string is deflected, are rounded, whereby a wear or damage of the string is excluded in the game mode and the Spieligensehaften the racket be further improved.

Furthermore, according to the present invention, it is also provided that a method for producing a ball impact device is specified, in which the headband relative to a mold, within which a head frame of a ball impact device is made, are positioned so that the mounting portions of the headband in the manufacture of Head frame in these protrude and be enclosed by the material thereof. Such a method offers the advantage of a quick and easy manufacturability of a head frame with anchored in this bracket. In this case, the head frame can be made of injection-molded, but in particular also using a fiber-reinforced plastic.

It is particularly preferred if the method according to the invention comprises the following method steps:

Positioning a first prepreg tube in a first, e.g. lower - head frame shape;

Positioning a second prepreg tube in a second, e.g. upper head frame shape;

- Positioning of a holding device for in this positionally held headband between the upper and lower head frame shape such that the mounting portions defining the retaining bracket protrude with a gap between the first and second prepreg tube; - Forming and curing of the prepreg tubes in the closed head frame mold embedding the headband mounting portions; and Demolding and cooling of the finished manufactured head frame with ah the frame inside firmly anchored headband.

This allows a ball impact device with high-precision arranged, in particular equally aligned holding straps for producing a string covering with excellent playing properties quickly and easily. The retaining clips are under the influence of high force during inflation of the prepreg tubes and during the molding process. The holding device ensures that the headband keep its intended positions relative to the head frame to be produced. Committee in the manufacturing process is thus largely avoided. The predetermined position and orientation of the headband are always ensured compared to the prior art. Particularly helpful in this context is the placement of a loading device with brackets, by means of a secure and accurate positioning of the headband within the aforementioned holding device is possible without the risk that when fixing the headband in the holding device, the headband change its position.

In order to produce a ball impact device with head frame and arranged therein headband, handle with a handle and a heart arranged therebetween, it is further provided that a method for producing a ball impact device is specified, in which the frame, which consists of head frame with brackets, and shaft with handle and Heart exists, is manufactured in a procedure.

Further details and advantages of the invention will now be explained in more detail with reference to an embodiment shown in the drawing.

Show it:

Fig. 1: the head frame of a ball impact device according to the invention within a production mold in cross section and on an enlarged scale;

2 shows a plan view of an inventively designed

Embodiment of a ball impact device, namely tennis racket; 3 is a detail view of an embedded in the head frame retaining bracket in plan view.

4 shows a perspective, a top view and a side view of two retaining clips of different predetermined length L;

Flg. 5; an enlarged view (perspective, top view,

Side view) of an exemplary retaining clip according to FIG. 4;

Fig. 6 perspective of a lower part of a holding device for retaining bracket;

Perspective of a fully assembled retaining device for retaining clips;

Perspective of a lower mold half for the production of a ball impact device according to the invention with positioned holding device for retaining bracket;

FIG. 9 shows a perspective view of a ball impact device with holding device located in a lower mold half after removal of an upper mold half; FIG.

10 shows an alternative embodiment of a head frame with embedded within a transverse web semi-oval retaining clips, in cross section. and

Fig. 11 insertion devices for the positioning of the headband in a perspective view.

Only the elements essential for the immediate understanding of the invention are shown. 1 shows a transverse section AA through the head frame 2 of a ball impact device 1 according to the invention within a production mold. In this case, a headband 20 between two halves 4, 6 of a head frame 2 is embedded. The head frame 2 is formed by two frame halves 4, 6 respectively of two tubular prepregs 4, 6. Approximately at the height of the impact surface 12, the section shows a double-walled circumferential transverse to the impact surface 12 approximately transverse web 40. The headband 20 is held for positioning between a on the upper holding tool 34 and a lower holding tool 32. The holding device 30 serves the positionally correct holding of the headband (s) 20 between an upper 52 and a lower 50 head frame shape such that the headband 20 with its mounting portions 22 in a region between the two prepreg tubes 4, 6 are included. The two prepreg tubes 4, 6 are then formed under pressure and heat supply between an upper mold 52 and a lower mold 50 and cured. The fastening sections 22 of the retaining clips 20 are respectively embedded and firmly anchored between the wall sections 42 of the two tube-like pre-pregs 4, 6 defining the double-walled transverse web 40. Of course, the two wall sections 42 of the two prepregs 4, 6 merge in the production of the head frame to a cross-piece material 40 of uniform material, while the fastening portions 22 of the headband are firmly embedded and anchored in this cross-web 40 then uniform material.

As already mentioned above, each headband 20 has a mounting portion 22 embedded in the head frame 2. The attachment portion 22 consists essentially of a longitudinal structure 26 and a transverse structure 27. At the intersection of the longitudinal and transverse structure 26, 27 of each attachment portion 22 is a character attached to the purpose of typing 14 - in Fig. 1, the number "2 ^* - , The character 14 attached for the purpose of typing corresponds to the type or length (LI to L5) of the haptic 20 in the circumferential direction of the head frame. The attached sign serves essentially for identification and later placement in the holding device 30. For this purpose, a plurality of holding clips 20 are fixed in the holding device 30 and then positioned on the first prepreg tube 4 in the first, lower head frame form 50. Subsequently, the mold 50, 52 are closed and thereby the headband 20 between the first and a second prepreg tube 4, 6 from which the head frame 2 is made, positioned. At- closing takes place shaping and hardening of the prepreg tubes 4, 6 in the closed head frame shape under pressure and heat supply whereby the mounting portions 22 of the headband 20 frictionally and positively between the two formed from the prepreg tubes 4, 6 head frame halves are embedded. After cooling, the finished manufactured head frame 2 can be removed from the mold with the anchored to the inside of the frame retaining clips 20.

Fig. 2 shows a plan view of a ball impact device 1 of an embodiment of the invention. The racket 1 consists essentially of the head frame 2, of the fabric arranged therein, which defines a Sehlagfläche 12 (formed of a plurality of intersecting string sections), as well as a club shaft 17, which includes a handle 16 and a so-called over which the shaft is connected to the frame frame. The heart 18, which is made up of two forked diverging webs or prepegubes 4, 6 (see Fig. 1) emanating from the shaft 17, together with the shaft 17 and the head frame 2 results in a one-piece racket 1. The illustrated embodiment which comprises an outwardly closed hollow profile, consists of a suitable material for the intended application of a sports equipment, for example, fiber-reinforced plastic. The striking surface 12 is formed by a string 8 (see Fig. 3), which is held at the head frame 2 under a predetermined tension, usually the string is attached to the frame by means of a tensioning device and tensioned. Within the main striking area 13, the striking surface 12 has a checkerboard-like covering pattern consisting essentially of identical squares. The aim of a manufactured racket according to the invention is a high degree of accuracy in the positioning of the holding bracket 20 (see Fig. 1), so that the aforementioned string pattern is available. Outside the main striking area 13, the string pattern deviates from the checkerboard shape. The intersecting string sections then bound more or less long rectangles.

3 shows an enlargement of a retaining clip 20 embedded in the head frame 2. A lateral gap "S" is defined between the retaining clip 20 and the head frame 2. The fastening section 22 anchored within the head frame 2 and firmly anchored in the head frame 2 is indicated accordingly spans the two ends of the protruding from the head frame bracket portion 24 of the retaining clip 20. The bracket has in particular, but not exclusively, in the region of the end-side rounded corners 29. The rounded corners prevent chafing of string 8 and unintentional injury thereto by sharp edges, as is common in conventional rackets with holes in the head frame. The string deflection surface 46 of the protruding from the head frame bracket portion 24 of the Haitebügels 20, against which the deflected portion of a string drops in the circumferential direction of the Köpfrahmens of a plane of symmetry 47 of the Haitebügel 20 on both sides slightly from. This deflection surface is preferably bent in the circumferential direction of the head frame in the direction of the impact surface or in the direction away from the inside of the head frame, wherein the radius is in the range of 80-150 mm.

Fig. 4 shows a first type of headband 20 and a fifth type of headband 20 each having different predetermined length LI and LS. In order to produce a uniform and substantially checkerboard-like stringing of the ball impact device 1, the different length L of the adaptation to different frame geometries, which are generally elliptical in the rule, and may be different sizes. In general, this requires a larger number of holding straps of a smaller predetermined length and a smaller number of holding straps of a larger predetermined length.

5 shows a perspective of a shark hoop 20, an end view with a frontally attached typing mark "2 * and a top view of this shark hoop 20. The plan view shows a symmetry line 47 and the rounded corners 29 of the hoop section 24 (see FIG ). At an intersection of the longitudinal and transverse structure 26, 27 of the attachment portion 22 of the Haitebügels 20 is attached for the purpose of typing character 14 - here number "T - provided. The character 14 attached for the purpose of typing indicates the type or length LI, etc. of a shark hoop 20. The attached sign 14 essentially serves for identification and later processing in a positioning and holding device 30 (see Fig. 7). The longitudinal and transverse structures 26, 27 of the fastening section 22 (see Fig. 3) are used for non-positive and positive anchoring of the Haitebügels 20 in the head frame and are in terms of their shape on the material of the plastic used, in particular a prepreg used for use , and its wall thickness optimized and tuned. In essence, it is important that the plastic rests positively on the outside of the Haitebügels 20, without voids or gas bubbles. For this purpose, the pressure during inflation of the prepreg tube must be selected together with the curing temperature used such that this is ensured. Furthermore, the aforementioned parameters must be selected accordingly, thereby the force transmission necessary for typical loads of a ball impact device between the head frame and the retaining clips 20 embedded therein is positively and positively absorbable.

6 and 7 show a lower holding tool 32 and an upper holding tool 34, which together form a holding device 30. Between the holding tools 32, 34, the headband 20, are inserted in a preferred manner accurately. For this purpose, a defined number of retaining clips 20 are inserted, for example, in the lower holding tool 32 and then the upper holding tool 34 fit over it. The lower holding tool 32 has a plurality of threaded holes 35, whereby the upper and lower holding tool are screwed together, and the headband 20 are held against mechanical stress in a desired position. The holding tool may have a plurality of material recesses 38. After the production of a ball impact device in a molding and hardening process according to the teaching of the invention, the screw 36 of the holding device 30 can be released again. This offers the advantage that the holding device 30 is reusable and can be used in a mass production process.

8 shows a lower mold 50 for producing a ball impact device 1 with an inserted holding device 30 with retaining clips 20. At the lower end of the lower mold 50, compressed air inlets 54 are provided, via which the prepreg tubes 4, 6 (see FIG Manufacturing process can be inflated. 9 shows a perspective view of a still to be demoulded, but essentially finished ball impact device 1, with head frame 2, heart 18 and shaft 17 with handle 16 and the headband 2 firmly anchored holding brackets 20th

It should be noted here that instead of the above-mentioned "one-piece ^w - construction and constructions with head frame on the one hand and separately molded shaft and / or handle and / or open or closed heart are conceivable. For all these constructions, the above-described inventive measures are applicable. In Flg. Fig. 10 is an alternative embodiment for a retaining bow embedded within a transverse web 40 of the head frame 2! 23 shown in cross section. The bracket 23 is formed in cross-section semi-oval-shaped, with the longer branch with the larger radius of curvature as a mounting portion and the short branch with a smaller radius of curvature than on the inside of the head frame on this freely projecting bracket section is used. This bow section is freely accessible from one side of the club face, ie the clothing of the ball impact device, eg tennis racket, is made via this free access or via the gap between the free end of the bow section and the inside of the head frame facing this free end. Incidentally, the production of the above alternative is carried out in a similar manner as the production of the embodiment according to FIGS. 1 to 8. In Fig. 11, an example of an insertion device 44 is shown by means of which the retaining clip held positionally secure and introduced into the holding device 30 is, so that when screwing the holding tools 32, 34, the headband 20 can not change their predetermined position. The insertion device 44 facilitates the positioning of the retaining clip 20 in the holding device 30.

Claims

Claims 1. Ball impact device (1), in particular tennis, squash or badminton rackets, with a head frame (2) comprising a striking surface, which is hollow and made of plastic, in particular one

fiber-reinforced plastic is produced, as well as an integrally formed shaft with handle, wherein the striking surface (12) by at least one cross-tensioned string (8) is determined, which forms substantially parallel to each other on the head frame mounted string sections, wherein the anchoring of the string sections on the head frame {2} is made by holding brackets (20) which are fastened to the inside of the head frame in such a way that they respectively extend substantially perpendicular to the face, whereby the ends (10) clamped in the holding brackets (20;

Ischnet that the headband (20; 23) to one of the two sides of the striking surface (12) towards open or from one of the two sides of the striking surface (12) forth for clamping the the Striking surface defining string are freely accessible.

2. Ball impact device according to claim 1, characterized in that for anchoring the string sections on the head frame a set of

Holding brackets (20; 23) is provided which comprises

a first number of retaining clips with a circumferential direction of the

Head frame first predetermined length (LI),

- At least a second number of headband with a in

Circumferential direction of the head frame second predetermined length

(L2),

optionally at least a third, fourth and fifth number of retaining clips with a circumferentially of the head frame third, fourth and fifth predetermined length (L3, L4, L5).

3. Ball impact device according to claim 1 or 2, dadurchgekennzehnet that the headband (20; 23) each one in the head frame (2) attached state of this outstanding bracket portion (24) and within the head frame (2) anchored mounting portion (22) ,

4. The ball impact device according to claim 3, wherein the fastening section (22) of each retaining clip (20) has longitudinal (26) and transverse structures (27) for positive and non-positive anchoring within the head frame (2).

5. Ball impact device, in particular according to one of claims 1 to 4,

wherein the strap portion (24) either to one side open or freely accessible from one side, in particular hook-shaped, preferably oval-hook-shaped, or closed on both sides, in particular annular, characterized in that the attachment portion (22) of a each holding bracket (20, 23) is embedded between two frame halves (4, 6) defining the head frame (2).

6. Ball impact device according to one of the preceding claims, in particular according to claim 5,

d a d u r c h g e k e n e, the head frame (2) is characterized by two frame halves each of one

tubular prepreg (4,6) is formed, which is approximately at the level of

Impact surface (12) define a double - walled circumferential approximately parallel to the impact surface (12) extending transverse web (40), wherein the

Fastening portions (22) of the retaining bracket (20; 23) in each case between the double-walled transverse web (40) defining wall portions (42) of the two tubular prepregs (4, 6) are embedded and thus firmly anchored.

7. A ball impact device according to one of the preceding claims, characterized in that the inner radius (21) of the retaining bracket (20; 23) is in a range of 0.5 to 1.9 mm.

8. Ball impact device according to one of the preceding claims, characterized in that the length of the headband (20; 23) in the circumferential direction of the Köpfrahmens each in the range of 5-30 mm, in particular the first predetermined length (LI) of the first number of brackets in one Range of 9 - 11 mm and / or the first number of brackets of the first

predetermined length (LI) 12 to 20, in particular 16, and / or the second predetermined length (L2) of the second number of retaining clips is in a range of 10 - 11 mm and / or the second number of

Holding straps of the second predetermined length (L2) 6 to 14, in particular 10, and / or

the third predetermined length (L3) of the third number of holding brackets is in a range of 11-13 mm and / or the third number of

Holding straps of the third predetermined length (L3) is 2 to 10, in particular 6, and / or

the fourth predetermined length (L4) of the fourth number of brackets is in a range of 16 - 18 mm and / or the fourth number of Holding straps of the fourth predetermined length (L4) is 2 to 8, in particular 4, and / or

the fifth predetermined length (L5) of the fifth number of holding brackets is in a range of 20 - 22 mm and / or the fourth number of

Holding straps of the fourth predetermined length (LS) 1 to 4, in particular 2.

9. Ball impact device according to one of the preceding claims, dadurehgekennzeichnet., That the headband (20; 23) of predetermined length each with a provided for the purpose of typing characters, especially visually and / or haptic recognizable or readable in any other readable or machine-evaluable form Characters indicative of the type of headband of predetermined length (LI; L2; L3; L4; 15).

10. Ball impact device according to one of the preceding claims, characterized in that between the free end of a holding bracket (20; 23) and the facing portion of the head frame (2) a lateral gap (S) is defined, wherein the width of this gap in the range of 1 , 0 to 2.0 mm, in particular in a range of 1.5 to 1.7 mm.

11. Ball impact device according to one of the preceding claims, characterized in that the front ends (29) of the retaining bracket (20, 23) over which the

Striking surface defining string (8) is deflected in each case, are rounded,

12. A method for producing a ball impact device according to one of

preceding claims, wherein the headband (20) relative to a shape, within which a head frame (2) of a ball impact device is made, are positioned so that the fastening portions (14) of the

Bracket (20, 23) in each case in the production of the head frame in this protrude and be surrounded by the material thereof.

13. A method for producing a ball impact device according to claim 12, wherein the following steps are carried out as follows:

Positioning a first prepreg tube (4) in a first, e.g. lower head frame shape (50);

Positioning a second prepreg tube (6) in a second, e.g. upper head frame shape (52);

Positioning a holding device (30) for the holding brackets (20, 23) held in this position between the upper and lower head frame form such that the fastening sections of the holding brackets (20, 23) are inserted into a region between the first and second prepreg tubes (4; protrude);

- Forming and curing of the prepreg hoses (4; 6) in the

closed head frame shape embedding the headband mounting portions (22); and

- Cooling and demolding of the finished manufactured head frame with firmly anchored to the inside of the frame retaining clips (20; 23).

14. A method for producing a ball impact device according to claim 12 or 13, wherein the frame, which consists of head frame (2) with retaining clips (20; 23), and shaft (17) with handle (16) and possibly heart (18) in one

Process is made.