A telescopic badminton racket handle structure

Abstract

This invention relates to the field of badminton racket technology, specifically to a telescopic badminton racket handle structure, comprising at least a racket shaft, a handle, a fixing sleeve, and a first locking member. The handle has a receiving cavity into which the racket shaft extends. The fixing sleeve is fitted onto the outer wall of the end of the racket shaft that extends into the receiving cavity, and the outer surface of the fixing sleeve has a conical structure. The first locking member is fixedly assembled at a first opening of the receiving cavity, and the first locking member has a second inner sidewall adapted to the outer surface of the fixing sleeve. When the racket shaft is extended, it is stretched away from the handle, and the fixing sleeve moves synchronously with the racket shaft and is nested within the first locking member. The second inner sidewall of the first locking member abuts against the outer surface of the fixing sleeve, locking the racket shaft and handle together. When the racket shaft is retracted, it is pushed towards the handle, and the fixing sleeve disengages from the first locking member as the racket shaft moves. The telescopic badminton racket handle structure provided by this invention has a simple overall structure and is easy to operate.

Description

Technical Field

[0001] This invention relates to the field of badminton racket technology, and more specifically to a telescopic badminton racket handle structure. Background Technology

[0002] Badminton, as a sport that combines competitiveness with mass fitness benefits, enjoys a wide audience worldwide. A badminton racket mainly consists of a handle, shaft, frame, and net.

[0003] Existing badminton rackets are generally quite long, typically 660mm to 680mm, and the shaft and handle are fixedly connected and cannot be disassembled immediately. They require a long badminton racket bag to fit in, but long badminton racket bags are inconvenient to carry and take up a lot of space.

[0004] CN222723570U discloses a badminton racket handle structure, including: a tube body and a telescopic mechanism; the telescopic mechanism includes a plate body, one end of which extends into the interior of the tube body and is fixedly connected to a limiting block, and racks are fixedly connected to both sides of the plate body. A gear is meshed on one side of the rack, and one side of the gear is rotatably connected to the inner wall of the tube body via a bracket. One side of the limiting block is movably connected to the tube body, and a slot is provided on the other side of the limiting block. A plug is inserted into the slot, and a movable rod is fixedly connected to one side of the plug. This badminton racket handle structure, through the arrangement of the tube body and the telescopic mechanism, allows the plate body to be completely retracted into the tube body, thereby enabling the badminton racket handle to reduce its volume.

[0005] The telescopic mechanism involves multiple sets of precision-fitting components, has a complex structure, and is cumbersome to process and assemble. The locking mechanism relies on the insertion block and slot to lock the badminton racket shaft and handle, which has relatively weak structural stability. During use, the vibration generated by hitting the shuttlecock for a long time can cause the insertion block to loosen from the slot, resulting in the racket shaft retracting unexpectedly and affecting the user's playing experience. Summary of the Invention

[0006] To address the shortcomings of existing badminton racket handle structures, such as complex structure and insufficient stability, this invention provides a telescopic badminton racket handle structure, comprising: The racket shaft has a first connecting end and a second connecting end that are opposite each other; The handle is movably connected to the second connecting end. The handle is hollow and has a receiving cavity and at least one first opening. The receiving cavity can accommodate the second connecting end, and the first opening is located on the side of the handle near the second connecting end. The fixing sleeve is hollow and is fitted onto the second connecting end. The outer surface of the fixing sleeve has a conical structure. The radial dimension of the conical structure gradually decreases along the X direction. The X direction is defined as the direction along the racket shaft from the second connecting end to the first connecting end. The first locking member is hollow and located inside the accommodating cavity and fixed to the first opening; the first locking member has a second inner sidewall that is adapted to the outer surface of the fixing sleeve; the minimum radial dimension of the second inner sidewall is smaller than the maximum radial dimension of the tapered structure of the outer surface of the fixing sleeve; When the second connecting end is located in the accommodating cavity and away from the first opening, the racket arm is pulled along the X direction, and the fixing sleeve moves toward the first opening; when the second inner sidewall is nested and fixed with the outer surface of the fixing sleeve, the distance between the second connecting end of the racket arm and the first opening is the smallest, and the racket arm is in an extended state; when the racket arm is pushed in the opposite direction of the X direction, the second inner sidewall is disengaged from the outer surface of the fixing sleeve, and the second connecting end of the racket arm moves away from the first opening in the accommodating cavity, and the racket arm is in a retracted state.

[0007] Furthermore, the shaft is made of carbon fiber.

[0008] Furthermore, the fixing sleeve includes a middle rod sleeve and a clamp; the middle rod sleeve is fitted and fixed to the outer wall of the second connecting end, and the clamp is fitted on the middle rod sleeve; the middle rod sleeve is provided with a protruding section and a mating section in sequence along the X direction, the clamp abuts against the protruding section, and the surface of the protruding section away from the mating section is flush with the surface of the second connecting end; the shape of the second outer side wall of the mating section is adapted to the shape of the third inner side wall of the clamp; the third outer side wall of the clamp forms a conical structure.

[0009] Furthermore, the center rod sleeve is made of [material name missing], and the clamp is made of nylon.

[0010] Furthermore, the chuck has several equally spaced slots that penetrate the third inner wall and the third outer wall of the chuck.

[0011] Furthermore, it also includes a second locking member, which is hollow and detachably connected to the handle in the first opening area; the second locking member includes a nut and a nut sleeve that are fixed together, the inner wall of the nut facing the first opening is provided with a first thread, the mating section of the middle rod sleeve is provided with a connecting section on the side away from the protruding section, and the outer wall of the connecting section is provided with a second thread that matches the first thread; when the racket shaft is in the extended state, rotating the second locking member locks the first thread and the second thread together, and the fixing sleeve is located in the area of ​​the first opening of the handle.

[0012] Furthermore, the nut is made of a lightweight alloy; the nut sleeve is made of nylon.

[0013] Furthermore, the second outer sidewall is a polygonal cylinder, and the third inner sidewall is a polygonal cylinder with the same number of sides and a matching profile as the second outer sidewall.

[0014] Furthermore, the second inner wall is a polygonal cone surface; the third outer wall is a polygonal cone surface with the same number of sides and a matching contour as the second inner wall.

[0015] Furthermore, the third outer sidewall is provided with a protruding snap-fit ​​strip along the axial direction, and the second inner sidewall is provided with a corresponding snap-fit ​​groove.

[0016] Based on the above, compared with the prior art, the telescopic badminton racket handle structure provided by the present invention allows the racket shaft to be extended when pulled away from the handle, thanks to the locking of the fixed sleeve with the first locking member and the fixed sleeve with the second locking member. This extended state is maintained stably for a long time through the locking connections. When the fixed sleeve and the second locking member are released and the racket shaft is pushed towards the handle, the fixed sleeve disengages from the first locking member, and the racket shaft moves away from the first locking member and is stored in the receiving cavity of the handle. This facilitates racket shaft storage and reduces the overall storage space occupied by the badminton racket. The present invention effectively solves the problems of complex structure and insufficient fixing reliability commonly found in existing telescopic badminton racket handles. The overall structure is simple and easy to operate, significantly improving the flexibility and stability of the badminton racket during use and enhancing the user experience.

[0017] Other features and beneficial effects of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other beneficial effects of the invention can be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Unless otherwise specified, the positional relationships shown in the drawings in the following description are based on the direction in which the components are drawn in the figure.

[0019] Figure 1 A schematic diagram of an embodiment of the telescopic badminton racket handle structure provided by the present invention; Figure 2 for Figure 1 The diagram shows a cross-sectional view of the telescopic badminton racket shaft handle structure in the retracted state. Figure 3 for Figure 1 The diagram shows a cross-sectional view of the telescopic badminton racket shaft handle in its extended state. Figure 4 for Figure 1 A three-dimensional structural diagram of the fixing sleeve in the telescopic badminton racket handle structure shown. Figure 5 for Figure 1A three-dimensional structural diagram of the second locking element in the telescopic badminton racket handle structure shown. Figure 6 for Figure 2 A magnified view of a portion of region A shown; Figure 7 for Figure 2 A magnified view of a portion of region B shown; Figure 8 for Figure 2 A three-dimensional structural diagram of the clamp and the first locking element in the telescopic badminton racket handle structure shown. Figure 9 for Figure 1 The diagram shows the structure of the handle in the telescopic badminton racket shaft handle structure. Figure 10 for Figure 8 A magnified view of a portion of region C shown; Figure 11 for Figure 8 A magnified view of a portion of region D shown.

[0020] Reference numerals: 1-Shaft; 11-First connecting end; 12-Second connecting end; 2-Handle; 21-Accommodating cavity; 211-First opening; 212-First inner wall; 213-Second opening; 22-Grip positioning surface; 23-Transition side; 3-Fixing sleeve; 31-Middle shaft sleeve; 311-Protruding section; 312-Matching section; 3121-Second outer wall; 313-Connecting section; 3131-Second thread; 32-Clamp; 321-Third inner wall; 322-Third outer wall; 3221-Snap-fit ​​strip; 323-Slot; 3231-First slot; 3232-Second slot; 4-First locking element; 41-First outer wall; 42-Second inner wall; 421-Snap-fit ​​slot; 5-Second locking element; 51-Nut sleeve; 52-Nut; 521-First thread. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that all terms used in this invention, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains, and should not be construed as limiting the invention. It should be further understood that the terms used in this invention should be understood to have the same meaning as those in the context of this specification and in the relevant field, and should not be understood in an idealized or overly formal sense, except as expressly defined in this invention.

[0023] Please see Figures 1 to 3 To provide a telescopic badminton racket with a simple structure and stable handle, this embodiment provides a telescopic badminton racket handle structure, specifically including: a racket shaft 1, having a first connecting end 11 and a second connecting end 12; a handle 2, movably connected to the second connecting end 12, the handle 2 being hollow, having a receiving cavity 21 and at least one first opening 211, the receiving cavity 21 being able to accommodate the second connecting end 12, and the first opening 211 being located on the side of the handle 2 near the second connecting end 12; a fixing sleeve 3, hollow in shape, fitted onto the second connecting end 12, the outer surface of the fixing sleeve 3 having a conical structure, the radial dimension of the conical structure gradually decreasing along the X direction, the X direction being defined as the direction along the racket shaft 1 from the second connecting end 12 to the first connecting end 11; and a first locking member 4, hollow in shape, located in the receiving cavity. The first locking member 4 has a second inner sidewall 42 that is adapted to the outer surface of the fixing sleeve 3. The minimum radial dimension of the second inner sidewall 42 is smaller than the maximum radial dimension of the tapered structure of the outer surface of the fixing sleeve 3. When the second connecting end 12 is located in the accommodating cavity 21 and away from the first opening 211, the stick 1 is pulled in the X direction, and the fixing sleeve 3 moves toward the first opening 211. When the second inner sidewall 42 is nested and fixed with the outer surface of the fixing sleeve 3, the distance between the second connecting end 12 of the stick 1 and the first opening 211 is the smallest, and the stick 1 is in an extended state. When the stick 1 is pushed in the opposite direction of the X direction, the second inner sidewall 42 is disengaged from the outer surface of the fixing sleeve 3, and the second connecting end 12 of the stick 1 moves away from the first opening 211 in the accommodating cavity 21, and the stick 1 is in a retracted state.

[0024] Specifically, the first connecting end 11 of the shaft 1 is fixedly connected to the frame (not shown in the figure). The fixed connection method is existing technology and will not be described in detail here. The second connecting end 12 of the shaft 1 is movably connected to the handle 2. The handle 2 is a grip component for the user to hold and control the badminton racket. The handle 2 is hollow in shape, and its receiving cavity 21 can accommodate the second connecting end 12 of the shaft 1, providing space for the extension and retraction of the shaft 1. The first outer side wall 41 of the first locking member 4 is a cylindrical structure. The first inner side wall 212 of the receiving cavity 21 fits against the first outer side wall 41 and can be fixed by means of adhesive bonding to ensure that the position of the first locking member 4 in the receiving cavity 21 remains stable. Preferably, the first opening 211 of the handle 2 is centrally located and located on the side of the handle 2 near the second connecting end 12. The shaft 1 passes through the first opening 211 and extends into the receiving cavity 21. The fixing sleeve 3 is fitted onto the second connecting end 12. The outer surface of the fixing sleeve 3 has a tapered structure. The second inner wall 42 of the first locking member 4 is adapted to the tapered structure of the outer surface of the fixing sleeve 3. The taper of the second inner wall 42 is consistent with the taper of the tapered structure of the outer surface of the fixing sleeve 3, and the minimum radial dimension of the second inner wall 42 is smaller than the maximum radial dimension of the tapered structure of the outer surface of the fixing sleeve 3. The first locking member 4 is a rigid structure made of light alloy material, ensuring that when the fixing sleeve 3 moves toward the first opening 211, the second inner wall 42 can nest with the outer surface of the fixing sleeve 3 and generate resistance and friction, thereby achieving stable locking of the fixing sleeve 3 and the first locking member 4. The light alloy has a density ≤ 5.4 g / cm³. 3 Alloy materials are formed by adding other alloying elements to a light metal matrix, mainly including aluminum alloys, magnesium alloys and titanium alloys.

[0025] For specific implementation details, please refer to [link / reference]. Figure 2 In the initial state, the handle 1 is retracted, and the retaining sleeve 3, along with the second connecting end 12 of the handle 1, is located at the bottom of the receiving cavity 21. At this time, the retaining sleeve 3 is axially unlocked from the first locking member 4 and spaced apart. When it is necessary to extend the handle 1, the user applies external force to pull the handle 1 in the X direction. The second connecting end 12 of the handle 1 drives the retaining sleeve 3 to move towards the first opening 211. The axial distance between the retaining sleeve 3 and the first locking member 4 gradually decreases. Because the minimum radial dimension of the second inner sidewall 42 is smaller than the maximum radial dimension of the conical structure, the retaining sleeve 3 can smoothly enter the first locking member 4. The side of the retaining sleeve 3 adjacent to the first opening 211 first enters the interior of the first locking member 4, entering a pre-nesting state. Under the pulling force, the handle 1 moves continuously towards the first opening 211. Since the taper of the second inner wall 42 matches the tapered structure of the outer surface of the fixing sleeve 3, and their dimensions are compatible, the tapered structure of the outer surface of the fixing sleeve 3 contacts the second inner wall 42 of the first locking member 4. As the fixing sleeve 3 continues to move, the contact area gradually increases, thereby increasing the radial resistance and friction. Please refer to [link / reference]. Figure 3 When the fixing sleeve 3 moves to the preset position, the conical structure on the outer surface of the fixing sleeve 3 is completely nested into the first locking member 4. Since the minimum radial end size of the second inner sidewall 42 is smaller than the minimum radial end size of the conical structure on the outer surface of the fixing sleeve 3, and combined with the characteristic that the two have the same taper, the conical structure on the outer surface of the fixing sleeve 3 forms a full circumferential contact with the second inner sidewall 42. The radial pressure and friction force of the second inner sidewall 42 on the fixing sleeve 3 are evenly distributed circumferentially, thereby fixing the fixing sleeve 3 in the first locking member 4. The relative displacement between the fixing sleeve 3 and the first locking member 4 is terminated, and the part of the racket shaft 1 that extends out of the handle 2 can remain stable and fixed, allowing the user to hit the ball normally.

[0026] When it is necessary to retract the handle 1, the user applies an external force to push the handle 1 in the opposite direction of the X direction, causing the fixing sleeve 3 to move synchronously away from the first opening 211. This thrust overcomes the radial pressure and friction of the second inner wall 42 on the fixing sleeve 3, causing the conical structure on the outer surface of the fixing sleeve 3 to gradually separate from the full circumference of the second inner wall 42, and the contact area gradually decreases as the fixing sleeve 3 moves. As the thrust continues to be applied, the fixing sleeve 3 gradually exits the first locking member 4, and the contact area between the conical structure on the outer surface of the fixing sleeve 3 and the second inner wall 42 gradually decreases until the fixing sleeve 3 is completely disengaged from the first locking member 4. At this time, the fixing sleeve 3 continues to move away from the first opening 211 along with the handle 1 until the handle 1 is retracted to the initial retracted state, and the entire retraction process is completed.

[0027] In this embodiment, the fixing sleeve 3 and the first locking member 4 are engaged to achieve fixation through the mutual pressure of the conical mating structure. No additional locking buttons or complex mechanisms are required, resulting in a simple and stable structure with no risk of loosening during impact. Extension and retraction operations can be completed simply by pulling or pushing the shaft 1, making operation convenient and requiring no additional professional tools. When swinging the badminton racket to hit the shuttlecock, centrifugal force and inertia cause the racket and fixing sleeve 3 to tend to move relative to the first locking member 4 in the X direction. This tendency further increases the radial pressure exerted by the second inner wall 42 on the fixing sleeve 3, making the fit between the fixing sleeve 3 and the first locking member 4 even tighter. Therefore, during actual play, the shaft structure becomes more stable as the hitting action progresses.

[0028] Please see Figure 2 and Figure 3To facilitate the replacement and maintenance of components within the accommodating cavity 21, the racket handle 2 has a second opening 213 at the end opposite to the first opening 211. The radial dimension of the second opening 213 is larger than the maximum radial dimension of the fixing sleeve 3, ensuring that the fixing sleeve 3 can be easily removed from the second opening 213 without disassembling the entire racket handle 2 to complete the maintenance or replacement of the fixing sleeve 3. To seal the second opening 213, the telescopic badminton racket handle structure also includes a bottom cover, which is detachably connected to the second opening 213. The connection method can be a snap-fit ​​connection, a threaded connection, etc. The bottom cover helps to seal the second opening 213, preventing dust, sweat, and other impurities from entering the accommodating cavity 21. When maintenance or replacement of the fixing sleeve 3 is required, only the bottom cover needs to be removed according to the corresponding connection method, and the relevant operation can be carried out through the second opening 213. The entire process is convenient and efficient and will not damage the overall structure of the racket handle 2.

[0029] The frame, bottom cover, etc. are all conventional technical means, so they are not clearly shown in the attached drawings.

[0030] Preferably, to improve the durability and reliability of the product, the shaft 1 is made of lightweight alloy or carbon fiber material, which is lightweight and high-strength.

[0031] The use of lightweight alloy or carbon fiber materials for the racket shaft 1 effectively reduces the overall weight of the shaft, decreasing hand load during swings and improving swing flexibility and ease of control. Furthermore, lightweight alloys offer excellent strength and toughness, while carbon fiber boasts high strength and high modulus. These properties ensure that the shaft 1 is resistant to deformation or breakage when subjected to impacts, vibrations, and other external forces, guaranteeing structural stability and lifespan.

[0032] Please combine Figure 2 and Figure 3 See Figure 4 To further enhance the stability of the fit between the fixing sleeve 3 and the first locking member 4, and improve their tightness, the fixing sleeve 3 includes a middle rod sleeve 31 and a clamp 32. The middle rod sleeve 31 is fitted and fixed to the outer wall of the second connecting end 12, and the clamp 32 is fitted onto the middle rod sleeve 31. The middle rod sleeve 31 has a protruding section 311 and a mating section 312 in sequence along the X direction. The clamp 32 abuts against the protruding section 311, and the surface of the protruding section 311 away from the mating section 312 is flush with the surface of the second connecting end 12. The shape of the second outer side wall 3121 of the mating section 312 is adapted to the shape of the third inner side wall 321 of the clamp 32. The third outer side wall 322 of the clamp 32 forms a conical structure. The middle rod sleeve 31 is made of light alloy material, and the clamp 32 is made of nylon material. The clamp 32 has several equally spaced slots 323, which penetrate the third inner side wall 321 and the third outer side wall 322 of the clamp 32.

[0033] Specifically, the fixing sleeve 3 is assembled from a center shaft sleeve 31 made of light alloy material and a clamp 32 made of nylon material. The center shaft sleeve 31 is a hollow cylindrical structure through which the racket 1 is inserted. The center shaft sleeve 31 has a protruding section 311 and a mating section 312 arranged sequentially along the X direction. The second outer side wall 3121 of the mating section 312 is adapted to the shape of the third inner side wall 321 of the clamp 32, so that the clamp 32 is fitted onto the mating section 312 of the center shaft sleeve 31. The radial dimension of the protruding section 311 is larger than the radial dimension of the mating section 312 and larger than the radial dimension of the inner surface of the side of the clamp 32 that abuts against the protruding section 311. The clamp 32 abuts against the protruding section 311 to restrict the movement of the clamp 32 in the opposite direction along the X direction. The radial and axial dimensions of the mating section 312 are adapted to the radial and axial dimensions of the third inner side wall 321 of the clamp 32 to meet the requirements of the fitting assembly. The inner diameter of the middle rod sleeve 31 is adapted to the outer diameter of the second connecting end 12. The middle rod sleeve 31 can be glued and tightly fitted onto the outer wall of the second connecting end 12. The chuck 32 has several axially extending slots 323 evenly spaced around its circumference. The slots 323 completely penetrate the third inner sidewall 321 and the third outer sidewall 322. The axial length of the slots 323 is less than the axial length of the chuck 32. The circumferential spacing between adjacent slots 323 is uniform and the slot width is less than the width of the chuck 32 body between adjacent slots, ensuring that the chuck 32 has both radial deformation capability and structural strength.

[0034] In specific implementation, please combine Figure 2 See Figure 4 During assembly, first, slip the clamp 32 onto the outer wall of the mating section 312 from the end of the middle rod sleeve 31 away from the protruding section 311. Continue pushing the clamp 32 until one end of the clamp 32 abuts against the protruding section 311 of the middle rod sleeve 31, completing the assembly of the middle rod sleeve 31 and the clamp 32 to form the fixing sleeve 3. Then, slip the assembled fixing sleeve 3 onto the second connecting end 12 of the racket shaft 1, and fix it with glue or the like, completing the assembly of the fixing sleeve 3 and the racket shaft 1.

[0035] Please see combination Figure 3 See Figure 4When it is necessary to extend the shaft 1, the user applies an external force along the X direction to pull the shaft 1, causing the middle shaft sleeve 31 to move synchronously toward the first opening 211. The clamp 32, which is fitted into the mating section 312 of the middle shaft sleeve 31, moves together with the middle shaft sleeve 31. When the clamp 32 contacts the second inner sidewall 42, the clamp 32 begins to undergo slight elastic deformation under the action of the second inner sidewall 42. The clamp 32 has several axially extending slots 323 evenly spaced around its circumference, and each slot 323 allows the various parts of the clamp 32 to undergo coordinated elastic deformation. As the clamp 32 gradually moves into the interior of the first locking member 4, the elastic deformation causes the clamp 32 to fully fit with the second inner sidewall 42. The clamp 32 continues to move along the X direction with the middle shaft sleeve 31 until it is completely nested into the first locking member 4. At this time, the shaft 1 and the handle 2 form a stable lock.

[0036] Please see combination Figure 2 See Figure 4 When it is necessary to retract the racket shaft 1, the user applies external force to push the racket shaft 1 in the opposite direction of the X direction, causing the middle shaft sleeve 31 and the clamp 32 to move synchronously away from the first opening 211. At this time, the reversible deformation of the nylon material causes the clamp 32 to gradually return to its original shape. With the spring-loaded action of the slot 323, the clamp 32 can easily disengage from the first locking member 4.

[0037] In this embodiment, the fixing sleeve 3 includes a detachably connected middle rod sleeve 31 and a collet 32. On the one hand, if the collet 32 ​​wears out due to long-term use, its function can be restored simply by replacing the collet 32, without replacing the middle rod sleeve 31. Furthermore, the nylon collet 32 ​​has slight elasticity, which helps compensate for minor assembly deviations, improves the conical surface fit, and avoids rigid friction between the lightweight alloy middle rod sleeve 31 and the first locking member 4, effectively reducing component wear and significantly lowering overall maintenance costs. On the other hand, the middle rod sleeve 31 and the collet 32 ​​are assembled separately, allowing for separate control of machining accuracy according to their functional requirements, reducing cumulative deviations in the overall assembly, and thus improving the fitting accuracy and stability of the collet 32 ​​and the first locking member 4. Several equally spaced slots 323 provide sufficient and uniform elastic deformation space for the collet 32 ​​in the circumferential direction, ensuring that the collet 32 ​​can undergo sufficient and coordinated radial contraction when under force, further preventing irreversible damage to the lightweight alloy middle rod sleeve 31 and the first locking member 4, which would affect their normal use and lifespan.

[0038] The collet 32 ​​needs to fit snugly against the tapered surface of the first locking member 4 and has a slot 323, which presents a high level of process complexity during machining. If the collet 32 ​​is made of nylon and manufactured through injection molding, compared to using light alloys or other metal materials, it can achieve mass production of the fixture 32 through injection molding. Moreover, the dimensional tolerance of the injection-molded fixture 32 can be stably maintained at 0.01mm, which is significantly improved compared to the conventional tolerance of 0.05mm for rigid machined fixtures. This can effectively ensure the stability and batch adaptability of the fixture 32 in high-precision assembly and positioning scenarios.

[0039] Meanwhile, the nylon material has excellent elastic deformation reversibility. Even with long-term, high-frequency extension and retraction of the racket shaft 1, the clamp 32 can still accurately adapt to the matching requirements of the first locking part 4, ensuring the long-term reliability of the extension and retraction function.

[0040] The protruding section 311 of the middle shaft sleeve 31 axially limits the clamp 32, effectively preventing the clamp 32 from sliding in the opposite direction of the X-axis, ensuring that the clamp 32 cannot fall off the middle shaft sleeve 31, and further improving the reliability of the racket shaft 1 fixation. The nylon clamp 32 has good elastic deformation capability. During the compression process, it can increase the contact area with the first locking member 4 through its own deformation, and at the same time form a circumferentially evenly distributed radial pressure and friction on the contact surface, strengthening the locking effect. In addition, both the middle shaft sleeve 31 and the first locking member 4 are made of light alloy material. With its high rigidity, it provides stable support for the overall shaft and handle structure, significantly enhancing the structural load-bearing stability. Moreover, the middle shaft sleeve 31 is sleeved on the outside of the second connecting end 12 of the racket shaft 1, which can effectively disperse the radial pressure on the racket shaft 1 when the first locking member 4 clamps, extending the service life of the racket shaft 1. The elastic contact between the nylon chuck 32 and the light alloy first locking member 4 can effectively disperse local stress and avoid the problem of local stress concentration that is easy to occur when rigid materials are in direct contact.

[0041] For preferred options, please refer to [link / reference]. Figure 4 To further optimize the structure of the chuck 32 and improve its crack resistance, the slot 323 includes a first slot 3231 and a second slot 3232 arranged alternately in the circumferential direction. The first slot 3231 starts at the end of the chuck 32 adjacent to the protruding section 311 and extends axially away from the protruding section 311; the second slot 3232 starts at the end of the chuck 32 away from the protruding section 311 and extends axially towards the protruding section 311. The extension length of each slot 323 is less than the total axial length of the chuck 32, and they do not form a continuous through-hole along the axial direction of the chuck 32.

[0042] By alternately setting the first slot 3231 and the second slot 3232 on the chuck 32, the chuck 32 can achieve axial coordinated deformation when subjected to radial compression from the first locking member 4 and the middle sleeve 31. This design provides the chuck 32 with ample and uniform radial shrinkage space, ensuring that the stress distribution inside the chuck 32 is optimized during the locking process, which is beneficial to improving the fatigue resistance of the chuck 32.

[0043] In use, when the clamp 32 is nested inside the first locking member 4, the second inner sidewall 42 exerts radial pressure on the clamp 32. The multiple slots 323 evenly distributed around the circumference of the clamp 32 facilitate slight contraction of various parts of the clamp 32, dispersing the pressure and preventing the clamp 32 from cracking due to stress concentration. At the same time, the contracted clamp 32 fits more tightly with the first locking member 4, further improving the fixation stability of the handle 1.

[0044] Please combine Figure 5 See Figure 6 and Figure 7 To further enhance the stability and reliability of the racket shaft 1, the telescopic badminton racket handle structure may also include a second locking member 5, which is hollow and detachably connected to the handle 2 in the area of ​​the first opening 211. The second locking member 5 includes a nut 52 and a nut sleeve 51 that are fixed together. The inner sidewall of the nut 52 facing the first opening 211 has a first thread 521. The mating section 312 of the shaft sleeve 31 has a connecting section 313 on the side away from the protruding section 311. The outer wall of the connecting section 313 has a second thread 3131 that matches the first thread 521. When the racket shaft 1 is in the extended state, rotating the second locking member 5 locks the first thread 521 and the second thread 3131 together, and the fixing sleeve 3 is located in the area of ​​the first opening 211 of the handle 2. The nut 52 is made of light alloy material; the nut sleeve 51 is made of nylon material.

[0045] Specifically, the second locking member 5 is a hollow structure and is detachably connected to the handle 2 in the area of ​​the first opening 211. The second locking member 5 is formed by a nut 52 made of light alloy material and a nut sleeve 51 made of nylon material. Preferably, the nut 52 is a nut 52 with a tapered outer surface and a radial dimension of the outer surface that gradually decreases along the X direction. The nut 52 has a cylindrical cavity section facing the first opening 211, and the inner sidewall of the cylindrical cavity section has a first thread 521. The inner sidewall of the nut sleeve 51 adjacent to the first opening 211 is adapted to the outer surface of the nut 52 and fixed with glue or the like. The radial dimension of the inner sidewall of the nut sleeve 51 away from the first opening 211 is adapted to the radial dimension of the outer sidewall of the handle 1 and is movably connected to the handle 1, allowing the second locking member 5 to slide axially or rotate circumferentially along the handle 1. The middle rod sleeve 31 is provided with an integrally formed protruding section 311, a mating section 312, and a connecting section 313 along the X direction. The maximum radial dimension of the connecting section 313 is not greater than the minimum radial dimension of the third inner sidewall 321 of the chuck 32, so that the chuck 32 can be assembled onto the mating section 312 through the connecting section 313. The radial and axial dimensions of the connecting section 313 are adapted to the inner sidewall of the nut 52. The outer wall of the connecting section 313 is provided with a second thread 3131 adapted to the first thread 521, so that the middle rod sleeve 31 and the second locking member 5 can be locked together by threaded connection. When the racket shaft 1 is in the extended state, the fixing sleeve 3 is positioned in the area of ​​the first opening 211 of the handle 2. The connecting section 313 of the middle rod sleeve 31 extends out of the accommodating cavity 21 through the first opening 211. By rotating the second locking member 5, the first thread 521 and the second thread 3131 are screwed together and locked. The second locking member 5 and the fixing sleeve 3 are locked together by threaded connection.

[0046] In practice, when it is necessary to extend and fix the racket shaft 1, the racket shaft 1 is initially fixed by the tapered structure on the outer surface of the fixing sleeve 3 pressing against the second inner wall 42 of the first locking member 4. Then, the second locking member 5 is rotated so that the first thread 521 and the second thread 3131 are screwed together, further locking the middle rod sleeve 31 in the current position, forming a double fixation. The locking between the second locking member 5 and the fixing sleeve 3 enhances the locking stability of the racket shaft 1 when it is in the extended state.

[0047] When it is necessary to retract the lever 1, rotate the second locking member 5 in the opposite direction to disengage the first thread 521 from the second thread 3131, and then push the lever 1 in the opposite direction along the X direction to retract the lever 1 into the receiving cavity 21.

[0048] In this embodiment, by adding a second locking member 5 and a connecting section 313 as a threaded locking structure, a double locking is formed by the mutual pressing and fixing of the fixing sleeve 3 and the first locking member 4. This significantly improves the stability and reliability of the racket shaft 1 in the extended state. Even if the fixing sleeve 3 or the first locking member 4 experiences slight wear, the threaded locking can still effectively limit the retraction of the racket shaft 1, extending its service life. Simultaneously, the second locking member 5 covers the first opening 211 of the receiving cavity 21, preventing dust, sweat, and other impurities from entering the receiving cavity 21, reducing the risk of corrosion and contamination of the components inside the receiving cavity 21, and improving the convenience of structural maintenance. The nut 52, made of lightweight alloy material, ensures the load-bearing capacity and structural stability of the threaded connection due to its high rigidity and strength, avoiding thread deformation or damage caused by long-term tightening operations. The nylon nut sleeve 51 reduces the overall structural weight, and its elastic properties help reduce the hard friction wear of the racket on the second locking member 5 when rotating or axially moving it, extending the service life of the second locking member 5.

[0049] Please see Figure 4 and Figure 8 To limit the relative rotation between the handle 2 and the shaft 1 in the extended state, the second inner wall 42 is a polygonal conical surface; the third outer wall 322 is a polygonal conical surface with the same number of sides and a matching profile as the second inner wall 42. To limit the relative rotation between the clamp 32 and the middle rod sleeve 31, the second outer wall 3121 of the middle rod sleeve 31 is a polygonal cylindrical surface, and the third inner wall 321 of the clamp 32 is a polygonal cylindrical surface with the same number of sides and a matching profile as the second outer wall 3121, in order to increase torque and limit the relative rotation between the clamp 32 and the middle rod sleeve 31.

[0050] Specifically, the second inner wall 42 and the third outer wall 322 are set as polygonal cone structures with the same number of sides, the same taper, and the inclination angle and side length of each cone surface are one-to-one corresponding; the second outer wall 3121 and the third inner wall 321 are set as polygonal structures with the same number of sides and perfectly matched contours.

[0051] In use, because the second outer sidewall 3121 and the third inner sidewall 321 are fitted polygonal cylindrical surfaces, the middle rod sleeve 31 and the clamp 32 can fit together along the axial direction after assembly, and the two cannot rotate relative to each other in the circumferential direction, thereby realizing the circumferential limit of the rod handle structure.

[0052] When it is necessary to extend and fix the racket shaft 1, pull the racket shaft 1 along the X direction. The racket shaft 1 drives the middle rod sleeve 31 and the clamp 32 to move synchronously along the X direction. When the middle rod sleeve 31 and the clamp 32 enter the first locking member 4, rotate the racket shaft 1 so that the polygonal conical surface of the third outer side wall 322 of the clamp 32 and the second inner side wall 42 of the first locking member 4 gradually fits together axially. Because the third outer side wall 322 and the second inner side wall 42 have the same number of sides, the contours are compatible and the tapers are consistent, the middle rod sleeve 31 and the clamp 32 are finally nested in place with the first locking member 4, and the racket shaft 1 is simultaneously axially stable and fixed without relative rotation in the circumferential direction.

[0053] When it is necessary to retract the racket shaft 1, push the racket shaft 1 in the opposite direction along the X direction. The racket shaft 1 drives the middle shaft sleeve 31 and the clamp 32 to move in the opposite direction simultaneously. The middle shaft sleeve 31 and the clamp 32 gradually disengage from the first locking member 4, and the circumferential limiting effect is released as the contact surface separates. After the middle shaft sleeve 31 and the clamp 32 are completely away from the first locking member 4, the second connecting end 12 of the racket shaft 1 can be smoothly retracted into the receiving cavity 21 of the handle 2.

[0054] In this embodiment, by optimizing the shapes of the middle sleeve 31, the clamp 32, and the first locking member 4, the torsional resistance of the shaft 1 is effectively improved, enhancing the practicality and reliability of the handle structure. Even in high-power scenarios such as smashes and flat drives, there is no risk of relative rotation, thus ensuring the accuracy of the hitting direction.

[0055] Preferably, for ease of processing, the second inner sidewall 42 is a regular polygonal cone surface; the third outer sidewall 322 is a regular polygonal cone surface with the same number of sides and a matching contour as the second inner sidewall 42.

[0056] In use, compared to irregular polygonal structures, regular polygonal conical surfaces have a regular and uniform geometric shape, which not only simplifies the processing steps and significantly reduces the complexity of the process, but also helps to improve production efficiency and ensure the stability of processing accuracy. Furthermore, the regular polygonal structure allows for uniform distribution of circumferential force along each side, thereby significantly enhancing the resistance to rotational torque of the fixed sleeve 3. This further optimizes the torsional resistance of the telescopic badminton racket using this shaft handle structure, ensuring that the shaft 1 does not rotate circumferentially during hitting the shuttlecock. In terms of user experience, this design allows the racket's center of gravity to precisely coincide with the shaft's central axis, ensuring a balanced and stable feel during hits.

[0057] Please see Figure 4 and Figure 8Preferably, to balance the processing difficulty and torque resistance of the fixing sleeve 3, the second outer side wall 3121 of the middle rod sleeve 31 can be selectively set as a regular hexagonal cylinder, a regular octagonal cylinder, or a regular dodecagonal cylinder, and the third inner side wall 321 of the clamp 32 is set as a regular polygonal cylinder with the same number of sides that matches the second outer side wall 3121; the third outer side wall 322 of the clamp 32 can be selectively set as a regular hexagonal cone, a regular octagonal cone, or a regular dodecagonal cone with the same number of sides as the cylinder, and the second inner side wall 42 of the first locking member 4 is set as a regular polygonal cone with the same number of sides that matches the third outer side wall 322.

[0058] Specifically, taking a regular octagon as an example, the second outer sidewall 3121 and the third inner sidewall 321 are both set as mutually adaptable regular octagonal prisms. Preferably, each edge of the second outer sidewall 3121 is chamfered, and each edge of the third inner sidewall 321 is set with a corresponding chamfer that adapts to the above-mentioned chamfer. The second inner sidewall 42 and the third outer sidewall 322 are both set as mutually adaptable regular octagonal cones. Preferably, each edge of the third outer sidewall 322 is chamfered, and each edge of the second inner sidewall 42 is set with a corresponding chamfer that adapts to the above-mentioned chamfer.

[0059] In use, circumferential positioning is achieved through the cylindrical section formed by the second outer side wall 3121 of the middle rod sleeve 31 and the third inner side wall 321 of the chuck 32, which directly restricts the relative rotation between the middle rod sleeve 31 and the chuck 32. Axial locking is achieved through the conical section formed by the third outer side wall 322 of the chuck 32 and the second inner side wall 42 of the first locking member 4. During assembly, the guiding effect of the conical surface ensures that the locking force is evenly transmitted to each contact surface. The aforementioned chamfered edge structure further enhances the torsional resistance of the rod handle structure. In addition, regular hexagons, regular octagons, and regular dodecagons are conventional side count structures in the field of machining, with mature and stable machining processes and more convenient processing. Compared to polygons with more sides, such as regular icosagons, regular hexagons, regular octagons, and regular dodecagons have fewer milling planes, simplifying the movement control of CNC equipment. Furthermore, the moderate number of sides allows for higher tolerances in dimensional analysis, and the larger angles between adjacent sides eliminate the need for excessively precise toolpath adjustments during machining. This effectively reduces assembly stalls or excessive clearances caused by dimensional deviations, lowering rework rates. Among these, the regular octagon achieves the optimal balance between machining difficulty and torsional resistance, making it the best choice in this design.

[0060] Optionally, considering the functional requirements of each component, the shaft 1 and the center sleeve 31 are already fixed together with glue or similar materials; while the clamp 32 and the first locking member 4, as the core force-bearing parts for fixing the shaft 1, need to withstand the high-frequency impact torque generated during ball impact. Therefore, the third outer side wall 322 of the clamp 32 and the second inner side wall 42 of the first locking member 4 are made of regular polygons with more sides than the third inner side wall 321 of the clamp 32, in order to enhance torsional resistance. This gradient design of the number of sides can not only accurately match the stress intensity of each mating part, but also optimize the torque transmission path from the shaft 1 to the first locking member 4, avoiding wear or deformation caused by stress concentration on local surfaces.

[0061] Please see Figure 9 To accommodate a natural hand grip, the outer periphery of the handle 2 is integrally formed with two relatively parallel grip positioning surfaces 22 along the axial direction, and these surfaces are parallel to the mesh surface of the frame. The grip positioning surfaces 22 are either flat or curved, and the distance between the two opposing grip positioning surfaces 22 is adapted to the width of an adult's palm, allowing the palm, thumb, and fingertips to fit comfortably and provide support, forming a clear grip positioning. The handle 2 also has several transition sides 23, located between adjacent grip positioning surfaces 22, which are smoothly transitioned curved or flat surfaces. Each grip positioning surface 22 and transition side 23 smoothly connect, together forming a non-circular cylindrical structure that accommodates a natural hand grip. The handle 2 is made of wood, providing a comfortable and non-slip grip.

[0062] Please combine Figure 8 See Figure 9 , Figure 10 and Figure 11 When the racket shaft 1 is extended and fixed, in order to keep the grip positioning surface 22 of the handle 2 parallel to the net surface of the racket frame, and to ensure that the direction of force when hitting the ball matches the direction of force on the racket frame, the third outer side wall 322 is provided with a protruding snap-fit ​​strip 3221 along the axial direction, and the second inner side wall 42 is provided with a corresponding snap-fit ​​groove 421.

[0063] Specifically, to ensure that the grip positioning surface 22 remains parallel to the racket frame mesh surface when the racket shaft 1 is in the extended state, the third outer side wall 322 is provided with a protruding snap-fit ​​strip 3221 along the axial direction, and the second inner side wall 42 is provided with a snap-fit ​​groove 421 that matches the shape of the snap-fit ​​strip 3221.

[0064] Specifically, one or more locking strips 3221 are protruding along the axial direction of the third outer wall 322 of the chuck 32. The cross-sectional profile of the locking strip 3221 is rectangular, trapezoidal, or arc-shaped. On the second inner wall 42 of the first locking member 4, one or more locking grooves 421 are provided corresponding to the position and profile of the locking strip 3221. The depth and width of the locking grooves 421 are adapted to the height and width of the locking strip 3221, respectively, to ensure that the locking strip 3221 can be smoothly inserted without obvious gaps.

[0065] In practice, during the extension of the racket shaft 1, rotating the racket shaft 1 causes the locking strip 3221 and the locking groove 421 to engage with each other to circumferentially position the racket shaft 1, ensuring that the gripping positioning surface of the handle 2 and the racket frame mesh surface always maintain a preset parallel position relationship. Subsequently, the user applies external force to pull the racket shaft 1 in the X direction, thereby nesting the clamp 32 into the first locking member 4, keeping the gripping positioning surface of the handle 2 parallel to the racket frame mesh surface. When it is necessary to retract the racket shaft 1, the user applies external force to push the racket shaft 1 in the opposite direction of the X direction.

[0066] In this embodiment, by setting the locking strip 3221 and the locking groove 421, the misalignment of the handle 2 and the frame caused by the extension and retraction of the shaft 1 or the vibration of hitting the ball can be avoided, thus improving the grip comfort and the stability of the hitting action. At the same time, it can also limit the circumferential rotation of the shaft 1 relative to the handle 2.

[0067] The various embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments.

[0068] In summary, compared with the prior art, the telescopic badminton racket handle structure provided by this invention allows the racket shaft 1 to be extended when pulled away from the handle 2, thanks to the locking of the fixing sleeve 3 and the first locking member 4. This extension is further reinforced by the threaded connection between the fixing sleeve 3 and the second locking member 5, achieving double locking and maintaining a stable extended state. When the fixing sleeve 3 and the second locking member 5 are released and the racket shaft 1 is pushed closer to the handle 2, the fixing sleeve 3 disengages from the first locking member 4, and the racket shaft 1 moves away from the first locking member 4 and is stored in the receiving cavity 21 of the handle 2. This facilitates the storage of the racket shaft 1 and reduces the overall storage space occupied by the badminton racket. This invention effectively solves the problems of complex structure and insufficient fixing reliability commonly found in existing telescopic badminton racket handles. The overall structure is simple and easy to operate, significantly improving the flexibility and stability of the badminton racket during use and enhancing the user experience.

[0069] Furthermore, those skilled in the art should understand that although many problems exist in the prior art, each embodiment or technical solution of the present invention can be improved in only one or a few aspects, without necessarily solving all the technical problems listed in the prior art or the background art simultaneously. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as a limitation on that claim.

[0070] Although this document frequently uses terms such as handle, shaft, first locking element, second locking element, fixing sleeve, center rod sleeve, clamp, nut sleeve, and nut, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention. The terms "first," "second," etc. (if present), in the specification, claims, and accompanying drawings of the embodiments of the invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A telescopic badminton racket handle structure, characterized in that, include: The racket arm (1) has a first connecting end (11) and a second connecting end (12) opposite to each other. The handle (2) is movably connected to the second connecting end (12). The handle (2) is hollow and has a receiving cavity (21) and at least one first opening (211). The receiving cavity (21) can accommodate the second connecting end (12). The first opening (211) is located on the side of the handle (2) near the second connecting end (12). The fixing sleeve (3) is hollow and is fitted onto the second connecting end (12). The outer surface of the fixing sleeve (3) has a conical structure. The radial dimension of the conical structure gradually decreases along the X direction. The X direction is defined as the direction along the handle (1) from the second connecting end (12) to the first connecting end (11). The first locking member (4) is hollow and is located in the accommodating cavity (21) and fixed to the first opening (211); the first locking member (4) has a second inner sidewall (42) that is adapted to the outer surface of the fixing sleeve (3); the minimum radial dimension of the second inner sidewall (42) is smaller than the maximum radial dimension of the tapered structure of the outer surface of the fixing sleeve (3); When the second connecting end (12) is located in the accommodating cavity (21) and away from the first opening (211), the stick (1) is pulled along the X direction, and the fixing sleeve (3) moves toward the first opening (211); when the second inner sidewall (42) is nested and fixed with the outer surface of the fixing sleeve (3), the distance between the second connecting end (12) of the stick (1) and the first opening (211) is the smallest, and the stick (1) is in an extended state; when the stick (1) is pushed in the opposite direction of the X direction, the second inner sidewall (42) is disengaged from the outer surface of the fixing sleeve (3), and the second connecting end (12) of the stick (1) moves away from the first opening (211) in the accommodating cavity (21), and the stick (1) is in a retracted state.

2. The telescopic badminton racket handle structure according to claim 1, characterized in that: The racket shaft (1) is made of carbon fiber.

3. The telescopic badminton racket handle structure according to any one of claims 1 or 2, characterized in that: The fixing sleeve (3) includes a middle rod sleeve (31) and a clamp (32); the middle rod sleeve (31) is fitted and fixed to the outer wall of the second connecting end (12), and the clamp (32) is fitted on the middle rod sleeve (31); the middle rod sleeve (31) is provided with a protruding section (311) and a mating section (312) in sequence along the X direction, the clamp (32) abuts against the protruding section (311), and the surface of the protruding section (311) away from the mating section (312) is flush with the surface of the second connecting end (12); the second outer side wall (3121) of the mating section (312) is adapted to the shape of the third inner side wall (321) of the clamp (32); the third outer side wall (322) of the clamp (32) forms the conical structure.

4. The telescopic badminton racket handle structure according to claim 3, characterized in that: The middle rod sleeve (31) is made of light alloy material, and the clamp (32) is made of nylon material.

5. The telescopic badminton racket handle structure according to claim 4, characterized in that: The chuck (32) has a plurality of equally spaced slots (323), which penetrate the third inner sidewall (321) and the third outer sidewall (322) of the chuck (32).

6. The telescopic badminton racket handle structure according to claim 3, characterized in that: It also includes a second locking member (5), which is hollow and detachably connected to the handle (2) in the area of ​​the first opening (211); the second locking member (5) includes a nut (52) and a nut sleeve (51) that are fixed together. The nut (52) has a first thread (521) on the inner sidewall facing the first opening (211). The mating section (312) of the middle rod sleeve (31) has a connecting section (313) on the side away from the protruding section (311). The outer wall of the connecting section (313) has a second thread (3131) that is adapted to the first thread (521); when the racket (1) is in the extended state, the second locking member (5) is rotated, and the first thread (521) and the second thread (3131) are locked together. The fixing sleeve (3) is located in the area of ​​the first opening (211) of the handle (2).

7. The telescopic badminton racket handle structure according to claim 6, characterized in that: The nut (52) is made of light alloy material; the nut sleeve (51) is made of nylon material.

8. The telescopic badminton racket handle structure according to claim 3, characterized in that: The second outer sidewall (3121) is a polygonal cylinder, and the third inner sidewall (321) is a polygonal cylinder with the same number of sides and a matching profile as the second outer sidewall (3121).

9. The telescopic badminton racket handle structure according to claim 3, characterized in that: The second inner wall (42) is a polygonal cone surface; the third outer wall (322) is a polygonal cone surface with the same number of sides and a matching contour as the second inner wall (42).

10. The telescopic badminton racket handle structure according to claim 3, characterized in that: The third outer sidewall (322) is provided with a protruding snap-fit ​​strip (3221) along the axial direction, and the second inner sidewall (42) is provided with a corresponding snap-fit ​​groove (421).

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