Racket shaft, racket frame, racket grip, and racket
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- CAS VALUE (FUJIAN) TECHNOLOGY CO LTD
- Filing Date
- 2026-06-05
- Publication Date
- 2026-08-03
Smart Images
Figure 0003256906000001_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of sports equipment, and particularly to racket shafts, racket frames, racket grips and rackets.
Background Art
[0002] As an essential sports equipment in badminton, the development of its production technology has played a significant role in the popularization of badminton and the improvement of the competitive level. High-performance badminton rackets can not only significantly improve the competitive performance of players, but also bring a more comfortable and efficient sports experience to ordinary enthusiasts.
[0003] In the prior art, in order to manufacture a good-performance badminton racket, not only a specific series of steps are adopted in the production process, but also many improvements have been made in terms of materials. Here, many rackets with relatively excellent performance are made of carbon fiber materials and are often produced using processes such as filament winding and press molding.
[0004] Specifically, in the filament winding process, the shaft is first processed. Carbon fiber yarn is uniformly wound around an auxiliary mandrel (e.g., an iron core) to form a specific structure. Next, the mandrel with the wound carbon fiber yarn is suspended and subjected to a heat degumming treatment to remove excess glue, and finally the auxiliary mandrel is pulled out to produce a hollow tubular carbon fiber shaft. Next, the frame preform is manufactured. Carbon fiber cloth is folded into carbon fiber strips of a specific specification, these carbon fiber strips are wound around a specific mold component, and the ends of the carbon fiber strips are brought close to each other and fixed in two grooves having a triple groove structure of the mold component. Subsequently, one end of the manufactured shaft is placed in the remaining groove of the triple groove (see Figure 1). Then, the ends of the carbon fiber strips and one end of the shaft are precisely wound and fixed using carbon fiber yarn or impregnated yarn material to produce a frame prototype, and finally, the frame prototype is placed in a molding machine and subjected to heat degumming molding. After molding, the racket undergoes finishing processes such as polishing and grinding, and through-holes are created using specialized drilling equipment, finally completing the manufacturing of the entire racket.
[0005] Clearly, when manufacturing badminton rackets using carbon fiber materials by winding or press molding, the manufacturing process is complex, requiring precise control of multiple steps. This not only increases production costs but also makes it difficult to realize complex structural designs. Furthermore, if the racket frame or shaft is damaged during use, limitations in the connection method often force the entire badminton racket to be discarded, which significantly impacts the overall performance and lifespan of the racket. [Overview of the Initiative] [Problems that the invention aims to solve]
[0006] To optimize the manufacturing process of badminton rackets and the service life of badminton rackets, this application provides a racket shaft, a racket frame, a racket grip, and a racket. [Means for solving the problem]
[0007] According to the first aspect, the racket shaft provided by this application employs the following technical solution.
[0008] A racket shaft for connecting a racket grip and a racket frame, wherein the racket shaft includes a hollow shaft body, a reinforcing structure is fixedly provided inside the shaft body, and both the reinforcing structure and the shaft body are manufactured by a 3D printing process.
[0009] According to a second aspect, the present application provides a racket frame and employs the following technical solution.
[0010] A racket frame comprising a hollow frame body, a support structure provided within the frame body, through-holes provided in the frame body through which strings pass, the through-holes penetrating the support structure, and both the support structure and the frame body being manufactured by a 3D printing process.
[0011] According to a third aspect, the present application provides a racket grip and employs the following technical solution. A racket grip fixedly connected to one end of a racket shaft, the racket grip includes a hollow grip body, the grip body is manufactured from a metal material by a 3D printing process, and the tube wall of the grip body has a plurality of hollow holes in the grip wall.
[0012] According to a fourth aspect, the present application provides a racket and employs the following technical solution.
[0013] A racket comprising the racket shaft, the racket frame, and / or the racket grip, wherein one end of the racket shaft is fixedly connected to the racket frame, and the other end is fixedly connected to the racket grip, and the racket frame, the racket shaft, and / or the racket grip are manufactured from a metal material, at least partially. [Brief explanation of the drawing]
[0014] [Figure 1] This is a reference diagram of the molding process used to manufacture badminton rackets using carbon fiber materials in the background technology. [Figure 2] This is a schematic diagram of the entire racket. [Figure 3] This is a diagram showing the racket in disassembled form. [Figure 4] This is a schematic diagram of the racket shaft of Example 1. [Figure 5] This is a cross-sectional view of the internal structure of the racket shaft of Example 1, cut along a virtual reference plane, and mainly shows the plate structure. [Figure 6] This is a cross-sectional view along line AA in Figure 4, and is mainly used to illustrate the first design for the racket shaft's reinforcing structure. [Figure 7] This is a cross-sectional view along line AA in Figure 4, and is mainly used to show a second design for the racket shaft's reinforcing structure. [Figure 8] This is a cross-sectional view along line AA in Figure 4, and is primarily used to illustrate a third design for the racket shaft's reinforcing structure. [Figure 9] This is a schematic diagram of a T-head and racket shaft manufactured as a single unit. [Figure 10] This is another schematic diagram of the racket structure of this application. [Figure 11] This is a schematic diagram of the internal structure of the racket frame of Embodiment 2 of this application, and is mainly used to show the support structure. [Figure 12] This is a cross-section of the racket frame of Embodiment 2 of this application, and is mainly used to illustrate the first design of the support structure. [Figure 13]It is a schematic diagram of the internal structure of the racket frame of the present application and is mainly used to show the second solution of the support structure. [Figure 14] It is another schematic diagram of the racket frame of Example 2 of the present application. [Figure 15] It is a cross-sectional view taken along line C-C in FIG. 14 and is mainly used to show the connection structure between the metal member and the non-metal member. [Figure 16] It is a schematic diagram of the main body of the racket grip of Example 3 of the present application. [Figure 17] It is used for the grip main body of Example 3 of the present application, mainly showing the distribution of the hollow holes. [Figure 18] It is a cross-sectional view taken along line B-B in FIG. 10 and is mainly used to show the cross-section of the frame.
Embodiments for Carrying out the Invention
[0015] Hereinafter, the present application will be further described by combining FIGS. 2 to 18.
[0016] The present application discloses a racket shaft, a racket frame, a racket grip and a racket.
[0017] Referring to Figures 2 and 3, the badminton racket of this application includes a racket grip 3, a racket shaft 1, and a racket frame 2, which are sequentially fixed together. The racket shaft 1 includes a shaft body 11. The racket frame 2 includes a frame body 21, which is provided with through holes 23, and the strings pass through these through holes to weave a string surface 28 on the inner ring of the frame body 21. To optimize the manufacturing process of the badminton racket and the service life of the badminton racket, the racket frame 2, racket shaft 1, and racket grip 3 may be manufactured integrally, or they may be manufactured individually and then assembled and fixed together. If the racket shaft 1 and the racket frame 2 are manufactured individually, a T-head 4 may be added as a connecting member. The T-head 4 corresponds to a "three-way joint," and the racket frame 2 and the racket shaft 1 can be produced independently, and the three are manufactured individually and then assembled and fixed together by welding, adhesive, etc. The T-head 4 may be manufactured integrally with the racket frame 2, or, of course, integrally with the racket shaft 1. Depending on the needs for different performance and individualization, the racket frame 2, racket shaft 1, and racket grip 3 can be manufactured using different production processes or materials, and designed into different structures. Specific combinations of structure and assembly should be seen in different embodiments.
[0018] Example 1 Referring to Figures 4 and 5, this embodiment provides a racket shaft 1 in which the shaft body 11 has a hollow structure, thereby ensuring a certain level of strength while simultaneously reducing the weight of the shaft body 11 and improving the flexibility of the racket during use. Specifically, in order to satisfy the torsional resistance, bending resistance, and recovery properties of the racket shaft 1, the wall thickness of the shaft body 11 can be designed to be 0.03 to 1.5 mm, and the diameter can be designed to be 5.5 to 6.5 mm, thereby ensuring the bending resistance of the racket shaft 1 under a certain pressure range. For example, it can recover even after applying a pressure of 20 kg to both ends of the shaft body 11 for a certain period of time. The bending resistance requirement may be that when a pressure of 30 kg is applied to both ends of the shaft body 11, the entire shaft body 11 has an elastic deformation of 9 to 10 mm.
[0019] To further enhance the bending resistance and recovery performance of the shaft body 11, a reinforcing structure 12 for bending resistance is provided on the shaft body 11. The reinforcing structure 12 and the shaft body 11 may be manufactured integrally by a 3D printing process, or they may be fixedly connected by welding or other means after each is manufactured. An integral structure allows the reinforcing structure 12 and the shaft body 11 to cooperate better, thereby increasing the overall strength and bending resistance of the shaft body 11. Integral manufacturing further simplifies the production flow, reduces errors and connection weaknesses in the production process, and allows for more uniform distribution of force in the shaft body 11, thereby effectively resisting bending. To further improve the material performance of the racket shaft 1, it may be manufactured by mixing multiple metal powders, or by compound printing of powders of multiple different materials alternately. The 3D printing process not only enables the realization of precise complex structures and ensures dimensional accuracy and performance stability of each part of the racket shaft 1, but also allows for individualized customization to meet different needs.
[0020] The reinforcing structure 12 can have multiple forms, each of which will be described below in conjunction with the attached drawings. The virtual reference plane 5 is defined as the vertical cross-section of the shaft body 11 perpendicular to the racket frame 2, which corresponds to the virtual reference plane 5 being perpendicular to the string surface 28 of the racket when the shaft body 11 is in a stationary position.
[0021] Referring to Figures 5 and 6, the reinforcing structure 12 mainly includes a single elongated plate 121, which is provided along the central axis of the shaft body 11, and its width is parallel to the virtual reference plane 5. If the shaft body 11 is hollow, both sides of the plate along the width direction are fixed to the inner wall of the shaft body 11. This increases the bending resistance of the shaft body 11, making the racket shaft 1 less likely to bend during use.
[0022] Referring to Figures 5 and 7, the reinforcing structure 12 may include at least two elongated plates 121 that intersect each other, with their longitudinal direction parallel to the central axis of the shaft body 11. Both sides of each plate 121 along its width direction are fixed to the inner wall of the shaft body 11. This reinforcing structure 12 enhances the bending resistance of the shaft body 11, and at the same time, the intersecting and fixed plates 121 can form multiple support areas inside the shaft body 11. When the shaft body 11 is subjected to bending forces from different angles, the intersecting plates 121 work together to better distribute the forces from different directions, making the forces received by the shaft body 11 uniform, avoiding bending due to localized excessive forces on the shaft body 11, further improving the overall stability of the racket shaft 1, and providing the player with a better user experience.
[0023] Referring to Figures 5 and 8, the reinforcing structure 12 may include at least two parallel elongated plates 121, the length of which is parallel to the central axis of the shaft body 11. By using parallel plates 121 as the reinforcing structure 12, the bending resistance of the shaft body 11 is increased to some extent by providing stable support to the racket shaft 1, while also facilitating production and manufacturing.
[0024] The plate 121 in the three different reinforcing structures 12 shown in Figures 6, 7, and 8 can enhance the bending resistance of the shaft body 11 in a specific direction, as if adding a support frame inside the shaft body 11. The plate 121 can be manufactured from the same material as the shaft body 11 to ensure good compatibility and integrity. The shape of the plate 121 may be a regular rectangle, or it may be designed with a certain arc or other special shape according to the actual needs to better adapt to the internal structure and force bearing conditions of the shaft body 11. For example, in some cases where the requirements for the bending resistance of the shaft body 11 are relatively high, the plate 121 can be designed with a shape that is thicker in the center and thinner at both ends, thus providing stronger support to critical areas. The plate 121 can enhance the bending resistance of the shaft body 11 by providing additional support when the shaft body 11 is subjected to bending forces and distributing stress.
[0025] Referring to Figure 5, the plate 121 may have hollow holes 122 in the thickness direction of the plate itself, thereby further reducing the weight of the shaft body 11 without affecting the reinforcing function of the plate 121, and at the same time, adjusting the elasticity and performance of the shaft body 11 to some extent.
[0026] Of course, in other embodiments, the reinforcing structure 12 may be a strip-shaped protrusion covering the inner wall of the shaft body 11, or a wire-like structure crisscrossing the inside of the shaft body 11, and the wire-like structure may be fixed to the inner wall of the shaft body 11. The wire-like structure of the reinforcing structure 12 may be a mesh structure formed from metal wire or high-strength fiber wire by weaving or welding, or it may be integrally molded with the shaft body 11 from the same material as the shaft body 11. The mesh structure can distribute forces received in multiple directions, further improving the bending resistance of the shaft body 11, and compared to the structure of the plate body 121, the mesh structure is lighter, and can better reduce the weight of the shaft. The reinforcing structure 12 may also be a protrusion installed on the outside of the shaft body 11, for example, provided as a straight protrusion parallel to the central axis of the shaft body 11 in accordance with the external structure of the shaft body 11, or as a spiral protrusion that wraps around the shaft body 11.
[0027] Referring to Figures 4 and 9, in embodiments where the racket shaft 1, racket frame 2, and T-head 4 are manufactured individually, and in embodiments where the T-head 4 and racket shaft 1 are integrally formed, the T-head 4 has two protrusions 41. The two protrusions 41 are positioned opposite each other with respect to the central axis of the shaft body 11. The T-head 4 quickly and firmly connects the racket shaft 1 and the racket frame 2 via the protrusions 41. Furthermore, the lengths at which the two protrusions 41 connect to the racket frame 2 may be different, thereby adjusting the weight in different areas of the racket frame 2 and meeting the needs of specific users. Of course, in many cases, the two protrusions 41 are positioned symmetrically with respect to the central axis of the shaft body 11, thereby uniformly distributing the force from the frame, improving connection compatibility and stability, and mitigating the problem of uneven swing force during badminton racket use.
[0028] In actual production, the racket frame 2 is provided with an insertion groove for inserting the protrusion 41, or the protrusion 41 is provided with a groove for inserting the end of the racket frame 2. After connecting the racket shaft 1 and the racket frame 2 with the T-head 4 and the protrusion 41, it is also necessary to wrap and cover the T-head 4 with carbon fiber thread, and then perform subsequent processes such as heat molding and degumming to firmly connect the racket frame 2 and the racket shaft 1.
[0029] The shaft body 11 and T-head 4 can be made of high-strength carbon fiber composite material, which is lightweight and has high strength, or metal materials such as aluminum alloy or magnesium alloy can be selected. The T-head 4 and shaft body 11 may be manufactured integrally by 3D printing, integrally by casting, forging, injection molding, or fixedly connected by sheet metal joining or the like.
[0030] To further reduce weight and improve assembly efficiency, as shown in Figure 9, both the T-head 4 and the protrusion 41 are provided in a hollow structure. The protrusion 41 has a deep groove 43 that extends toward the end, and the deep groove 43 penetrates both the side wall of the protrusion 41 near the shaft body 11 and the side wall of the protrusion 41 far from the shaft body 11 simultaneously. The direction in which the deep groove 43 penetrates both sides of the protrusion 41 aligns with the direction of the through-hole 23, ensuring that it does not affect string threading at the connection point between the protrusion 41 and the racket frame 2. This structural design makes the connection between the racket frame 2 and the T-head 4 more flexible and improves compatibility, reduces the weight of the protrusion 41 and the overall weight of the racket shaft 1, and improves racket handling performance.
[0031] Referring to Figure 9, the outer diameter of the protrusion 41 is designed to gradually decrease from the part closest to the shaft body 11 towards the end. This is advantageous for better insertion of the protrusion 41 into the connection part of the racket frame 2 (for example, the insertion groove of the racket frame 2), and is also advantageous for reducing the weight of the end of the protrusion 41, and improving the convenience and strength of the connection.
[0032] To further improve the overall bending resistance of the racket shaft 1, the plate 121 in the reinforcing structure 12 can extend in the direction of the T-head 4 and be fixed inside the T-head 4.
[0033] In other embodiments, an anti-rotation structure is provided at the end of the shaft body 11 to which the racket grip 3 is connected. This structure firmly connects the racket shaft 1 and the racket grip 3, ensuring the relative position of the racket shaft 1 and the racket grip 3 during use and improving torsional resistance. The anti-rotation structure may be a fitting structure of a protrusion and a recess. For example, a protrusion at the end of the shaft body 11 and a recess inside the racket grip 3 fit together, preventing the shaft from rotating relative to the grip during use, which improves the overall stability and operability of the racket. The anti-rotation structure may also be designed as follows: the cross-section of the end of the shaft body 11 is non-circular, for example, roughly square or roughly elliptical, and the racket grip 3 has a mounting groove that fits the end of the shaft body 11. The anti-rotation structure may be a fitting structure between a through hole opened at the end of the shaft body 11 and a pin shaft. When the racket shaft 1 is attached to the racket grip 3, the pin shaft passes through the racket grip 3 and the through hole in the shaft body 11 simultaneously, making the end of the shaft body 11 firmly fixed to the racket grip 3.
[0034] Referring to Figures 4 and 5, in one embodiment, in order to reduce air resistance, the shaft body 11 is provided with hollow holes 111 in the shaft wall that penetrate the side wall, which reduces the weight of the racket shaft 1 and improves the flexibility of use of the racket, while at the same time saving on material costs to some extent and reducing air resistance during use. Referring to Figure 5, the hollow holes 111 in the shaft wall are distributed on both sides close to the virtual reference plane 5 of the shaft body 11, in other words, the openings of these hollow holes 111 in the shaft wall are aligned with and parallel to the direction of the racket's shot, and can effectively reduce resistance during the racket's shot motion.
[0035] Example 2 Referring to Figures 10 and 11, the frame body 21 of the racket frame 2 in this embodiment has a hollow structure, thereby reducing the weight of the frame body 21 and increasing the swing speed of the racket. Referring to Figure 12, a support structure 22 is provided inside the frame body 21, and the through hole 23 passes through the support structure 22, ensuring that the strings can be stably fixed to the frame body 21. Both the support structure 22 and the frame body 21 are manufactured by a 3D printing process. The support structure 22 may be manufactured integrally with the frame body 21, avoiding potential loosening or misalignment problems between the support structure 22 and the frame body 21, making the frame body 21 more stable when subjected to torsional forces, thereby increasing the torsional resistance of the frame body 21 and simultaneously lowering production costs. The frame body 21 and the support structure 22 can be manufactured using a 3D printing method.
[0036] To further improve the material performance of the racket frame 2, it may be manufactured by mixing multiple metal powders, or by alternately compound printing multiple powders of different materials. The 3D printing process enables the realization of precise complex structures, ensuring dimensional accuracy and performance stability of each part of the racket shaft 1, and also allows for individualized customization to meet different needs.
[0037] Referring to Figures 11 and 12, in different embodiments, the support structure 22 may include several strips 221, the width of which is perpendicular to the length of the through-hole 23. The strips 221 are embedded within the frame body 21 and can be made of the same material as the frame body 21. Here, the strips 221 are annular and may be fixedly connected to the frame body 21 along their width, thereby forming multiple support surfaces inside the frame body 21. When the frame body 21 is subjected to torsional force, the strips 221 distribute the stress and prevent torsional deformation of the frame body 21, thereby improving the torsional resistance of the frame body 21.
[0038] Referring to Figure 13, in another embodiment, the support structure 22 includes a plurality of support bars 222 that are intersected inside the frame body 21, all of which are fixed to the inner wall of the frame body 21, forming a mesh structure that can distribute forces in multiple directions, thereby increasing the torsional resistance of the racket frame 2 and the bending resistance of the frame body 21.
[0039] The support structure 22 can further connect to the frame body 21 by an engagement method involving the fitting of an engagement block and an engagement groove. Here, the support structure 22 and the frame body 21 may be manufactured from the same material or from different materials.
[0040] Referring to Figures 14 and 15, to improve the individualization needs of rackets, the frame body 21 of the racket frame 2 may be locally manufactured from a metallic material, and the parts manufactured from a metallic material are defined as metallic members 26 and are used for decoration or reinforcement of local structures, while the remaining parts may be manufactured from a non-metallic material and are defined as non-metallic members 27. The metallic members 26 can first be manufactured individually by processes such as 3D printing, forging, or casting, and then connected to the non-metallic members 27 through processes such as assembly, injection molding, or 3D printing to form an annular frame body 21. For example, a fixing structure 25 may be used to enclose and fix the connection between the metallic members 26 and the non-metallic members. The fixing structure 25 may be a plastic sleeve, an injection molded product, or a structure manufactured by wrapping or heating carbon fiber cloth. By using metal components 26 in areas with relatively high strength requirements, such as the middle, top, or connection point to the shaft of the frame body 21, the strength requirements and durability of those parts of the racket frame 2 can be ensured. However, by using non-metallic components 27 in other parts, the weight of the racket can be reduced, and material costs can be saved.
[0041] Referring to Figure 14, in an embodiment in which the T-head 4 and the racket frame 2 are integrally formed, the T-head 4 and the frame are manufactured integrally by a 3D printing process, and the T-head 4 has a lower connecting portion 44 for connecting to the racket shaft 1. During assembly, the lower connecting portion 44 of the T-head 4 is inserted into the racket shaft 1 using a jig, and then the connection portion is wrapped with carbon fiber cloth and reinforced by a process such as heat degumming or injection molding, thereby firmly connecting the racket frame 2 and the racket shaft 1. To ensure an accurate and firm connection between the racket shaft 1 and the racket frame 2, the T-head 4 and the shaft body 11 may be connected to each other by insertion, and at least one of the lower connecting portion 44 and the end of the shaft body 11 is provided with an anti-rotation bump, and the other is provided with a matching groove to enable quick and accurate insertion and effectively limit the rotation of the T-head 4 and the racket frame 2 relative to the central axis of the racket shaft 1.
[0042] Example 3 Referring to Figures 10 and 16, this embodiment provides a racket grip 3, the grip body 31 of which is manufactured from a metal material by 3D printing. By combining metal material with 3D printing technology, the grip has good strength and durability, while 3D printing can accurately realize complex structural designs and meet the user's individualized racket grip 3 needs. The hollow structure design can reduce the weight of the grip.
[0043] Referring to Figures 10 and 16, to facilitate the user's grip, the grip body 31 can be further divided into an integrally formed connecting portion 311 and a gripping portion 312. The connecting portion 311 is used to connect to the shaft and has a frustoconical shape. This structural design allows for better force transmission, effectively transferring the force during ball striking from the grip to the racket shaft 1 and racket frame 2, and similarly, the force can be transmitted in the reverse direction when receiving a ball. The end of the connecting portion 311 closest to the gripping portion 312 has a protruding ring 313, the outer diameter of which is larger than the outer diameter of the adjacent portion of the gripping portion 312. The protruding ring 313 acts as a position regulating mechanism, allowing the user to more accurately find the correct position when gripping the grip and improving gripping stability. The connecting portion 311 can be made of metal materials such as aluminum alloy or titanium alloy. Aluminum alloy is lightweight and has relatively high strength, while titanium alloy has higher strength and better corrosion resistance. However, the gripping portion 312 may be made of the same metal material as the connecting portion 311, and surface treatment may be applied according to the needs, for example, by adding an anti-slip coating to improve gripping comfort and friction.
[0044] Referring to Figure 16, the grip body 31 is provided with a few reinforcing bumps 314 extending toward the shaft on the side closer to the shaft. The reinforcing bumps 314 are fixedly connected to the side wall of the shaft, with a gap 315 between each reinforcing bump 314. The reinforcing bumps 314 can enhance the connection stability between the grip and the shaft and improve the overall strength of the structure. The material of the reinforcing bumps 314 is the same as that of the grip body 31 and is manufactured integrally. The reinforcing bumps 314 may be rectangular, trapezoidal, or the like. In this embodiment, the width of the reinforcing bumps 314 gradually decreases from the grip body 31 toward the frame. For example, there are two reinforcing bumps 314, and the gap 315 forms a V-shaped notch, with the maximum distance between the notches being greater than or equal to the outer diameter of the shaft. The two reinforcing bumps 314 are symmetrically placed on both sides of the shaft and are located on both sides of the racket hitting surface. These symmetrically positioned reinforcing bumps 314 and V-shaped notches ensure connection stability while preventing excessive interference with the batted ball.
[0045] Referring to Figures 16 and 17, the grip body 31 has a hollow structure. The racket grip 3 further includes a complementary member 32, whose hardness is lower than that of the grip body 31, which can mitigate some of the impact force transmitted from the racket shaft 1 and improve the feel during movement. The complementary member 32 is provided inside the grip body 31. The complementary member 32 allows for adjustment of the weight distribution and feel of the grip as needed. In this embodiment, the complementary member 32 may be made of a foamed material, such as polyurethane foam or polyethylene foam. Foamed materials are lightweight and have excellent cushioning properties, which can improve gripping comfort.
[0046] An opening 33 is provided at the end of the grip body 31 furthest from the shaft, and the supplementary member 32 is installed inside the grip body 31 through the opening 33, thereby facilitating the installation and replacement of the supplementary member 32. Of course, the supplementary member 32 can be manufactured integrally with the grip body 31 by a molding process, making the grip structure more robust.
[0047] Referring to Figure 17, the arrangement of multiple hollow holes 316 in the tube wall of the grip body 31 not only further reduces the weight of the grip, but also improves the breathability and sweat-wicking properties of the grip, thereby enhancing gripping comfort. The hollow holes 316 in the grip wall may be circular, square, triangular, strip-shaped, or other shapes.
[0048] In an embodiment in which the hollow holes 316 of the grip wall are arranged in the tube wall of the grip body 31, the hollow design of the tube wall helps to firmly fill the complementary member 32, and if the complementary member 32 is made of foam or rubber material, the complementary member 32 can be covered onto the surface of the grip body 31 through the hollow holes during molding and manufacturing, thereby providing the grip with different tactile sensations and cushioning performance.
[0049] In embodiments in which the hollow holes 316 in the grip wall are arranged according to a certain rule (for example, in a striped pattern along the length), the elasticity of the grip body 31 can be further improved, providing a certain cushioning and vibration damping effect, and enhancing the comfort of swinging and gripping.
[0050] Example 4 Referring to Figures 2 and 3, this example provides a racket that includes one or more of the structures of the racket shaft 1, racket frame 2, and racket grip 3.
[0051] To further improve production efficiency and reduce production costs, at least two of the racket frame 2, racket shaft 1, and racket grip 3 are manufactured as a single unit using 3D printing technology. Materials that can be used in the 3D printing process include powders of magnesium alloys, aluminum alloys, titanium alloys, stainless steel, etc., and may also be non-metallic materials such as high-performance plastics or composite ceramic powders. In the embodiments of this application, preferably, light metal materials with a density less than 5 g / cm³, such as titanium alloys, aluminum-titanium alloys, magnesium-lithium alloys, aluminum-lithium alloys, aluminum alloys, and magnesium alloys, are used, with titanium alloy materials being preferred. 3D printing is performed in a high-concentration inert gas environment of 90% to 99%, and an argon environment of 90% to 99% is preferred.
[0052] Referring to Figure 10, to further reduce the weight of the racket, the hollow design of the shaft body 11 and frame body 21 can reduce air resistance during racket use. The shape, size, and distribution of the hollow holes 111 in the shaft wall and the hollow holes 24 in the frame wall can be designed according to actual needs. For example, they can be designed in different shapes such as circular or square to achieve a dual effect of aesthetics and practicality. Furthermore, by setting the diameter of these hollow holes to gradually decrease from the outside toward the central axis of the frame body 21, the area of the tube wall between the hollow holes can be increased, further reducing the weight of the frame body 21 while ensuring structural strength. At the same time, the velocity of the air passing through the hollow holes can be increased, further reducing air resistance and improving the flexibility of the racket during use.
[0053] Referring to Figure 18, in order to further reduce air resistance when using the racket, the frame cross section of the frame body 21 of the racket frame 2 is made perpendicular to the central axis of the frame itself, and the ends of the frame cross section that are symmetrical with respect to the string surface 28 are designated as tips 29, and the width of the frame cross section gradually increases from the tips 29 toward the center, which corresponds to the cross section of the frame body 21 being spindle-shaped. When in use, the windward side when swinging the racket frame 2 is the tip 29 side, which has the role of cutting through the wind and can reduce air resistance during the movement of the frame.
[0054] The above are all preferred embodiments of the present application and do not limit the scope of protection of this application. Therefore, all equivalent variations based on the structure, shape, and principle of this application are included within the scope of protection of this application. [Explanation of Symbols]
[0055] 01, carbon fiber strip, 02, shaft, 03, mold component, 04, three-way groove, 1. Racket shaft, 11. Shaft body, 111. Hollow hole in the shaft wall, 12. Reinforcement structure, 121. Plate body, 122. Hollow hole in the plate body, 2. Racket frame, 21. Frame body, 22. Support structure, 221. Strip plate, 222. Support bar, 23. Through hole, 24. Hollow hole in frame wall, 25. Fixing structure, 26. Metal component, 27. Non-metal component, 28. String surface, 29. Tip, 3. Racket grip, 31. Grip body, 311. Connecting part, 312. Gripping part, 313. Protruding ring, 314. Reinforcement bump, 315. Spacing, 316. Hollow hole in the grip wall, 32. Complementary member, 33. Opening, 4, T-head, 41, protrusion, 43, deep groove, 44, lower connection part, 5. Virtual reference plane.
Claims
1. A racket shaft for connecting a racket grip and a racket frame (2), wherein the racket shaft (1) includes a hollow shaft body (11), a reinforcing structure (12) is fixedly provided inside the shaft body (11), and both the reinforcing structure (12) and the shaft body (11) are manufactured by a 3D printing process.
2. The racket shaft according to claim 1, wherein the reinforcing structure (12) includes at least one elongated plate (121), the longitudinal direction of the at least one plate (121) is parallel to the central axis of the shaft body (11), and both sides of the plate (121) along the width direction are fixed to the inner wall of the shaft body (11).
3. The racket shaft according to claim 1, further comprising a T-head (4), the T-head (4) being fixedly connected to one end of the shaft body (11), the T-head (4) having two protrusions (41), the two protrusions (41) being arranged opposite each other with respect to the central axis of the shaft body (11), and the protrusions (41) being used for connection to the racket frame (2).
4. The racket shaft according to claim 3, characterized in that the vertical cross section of the shaft body (11) perpendicular to the racket frame (2) is defined as a virtual reference plane (5), the two protrusions (41) are provided on both sides of the T-head (4) with respect to the virtual reference plane (5), and the reinforcing structure (12) itself is symmetrical with respect to the virtual reference plane (5).
5. A racket frame characterized in that it includes a hollow frame body (21), a support structure (22) is provided inside the frame body (21), a through hole (23) for strings to pass through is provided in the frame body (21), the through hole (23) penetrates the support structure (22), and both the support structure (22) and the frame body (21) are manufactured by a 3D printing process.
6. The racket frame according to claim 5, characterized in that the support structure (22) includes several strips (221), and the width direction of the several strips (221) is perpendicular to the length direction of the through-hole (23).
7. The racket frame according to claim 5, characterized in that the support structure (22) includes a plurality of support bars (222) arranged intersectingly inside the frame body (21), the plurality of support bars (222) intersecting and fixed to the inner wall of the frame body (21) to form a mesh structure.
8. The racket frame according to claim 5, characterized in that a string surface (28) is provided on the inner ring of the frame body (21), the frame cross section is a cross section perpendicular to the central axis of the frame body (21), the ends of the frame cross section symmetrical with respect to the string surface (28) are tips (29), and the width of the frame cross section gradually increases from the tips (29) toward the center.
9. A racket grip fixedly connected to one end of a racket shaft (1), wherein the racket grip (3) includes a hollow grip body (31), the grip body (31) is made of metal and manufactured by a 3D printing process, and a plurality of hollow holes (316) are arranged in the tube wall of the grip body (31).
10. The racket grip according to claim 9, characterized in that a supplementary member (32) having a lower hardness than the grip body (31) is provided inside the grip body (31).
11. The racket grip according to claim 9, characterized in that the end of the grip body (31) closest to the racket shaft (1) is provided with several reinforcing bumps (314) extending toward the racket shaft (1), the reinforcing bumps (314) are fixedly connected to the side wall of the racket shaft (1), and there is a gap (315) between each reinforcing bump (314).
12. A racket comprising a racket shaft (1) according to any one of claims 1 to 4, a racket frame (2) according to any one of claims 5 to 8, and / or a racket grip (3) according to any one of claims 9 to 11, wherein one end of the racket shaft (1) is fixedly connected to the racket frame (2), and the other end is fixedly connected to the racket grip (3), and the racket frame (2), the racket shaft (1), and / or the racket grip (3) are manufactured from at least partially a metal material.
13. The racket according to claim 12, characterized in that the racket shaft (1), the racket frame (2), and / or the racket grip (3) are manufactured by a 3D printing process using a lightweight metal with a density less than 5 g / cm³.