Multi-functional table tennis bat with straight-to-cross conversion

Abstract

The utility model discloses a kind of straight transverse conversion multifunctional table tennis bat, belong to sports equipment technical field.The structure of conventional table tennis bat is fixed, cannot be converted between these two basic bat types of straight bat and transverse bat.The handle of the table tennis bat is composed of fixed handle section fixedly connected with bat body and movable handle section axially movable and sleeved on the free end thereof.A recess is provided on the free end of fixed handle section, and a clamping edge with a notch is provided on the outer end thereof.A through hole is provided in movable handle section, a button is arranged in the through hole, and a combined sliding groove and a resilient cantilever beam with a clamping block are arranged on the inner wall of the through hole.When the button is pressed, the resilient rope pulls the cantilever beam to make the clamping block radially contract, thereby releasing the locking between the movable handle section and the fixed handle section, and achieving the disassembly of the movable handle section.The movable handle section and the fixed handle section are butted and pressed, the movable handle section can be installed and locked, and the conversion between the two bat types of straight bat and transverse bat is completed.The table tennis bat is used for table tennis, and the bat type is changed by disassembling or installing the movable handle section.

Description

Technical Field

[0001] This utility model relates to the field of sports equipment technology. More specifically, this utility model relates to a multi-functional table tennis racket that can be converted between vertical and horizontal grips. Background Technology

[0002] In the field of table tennis, the penhold grip was once a traditional advantage of my country. Its core grip involves the thumb and index finger precisely gripping the edge of the racket face, while the middle to little fingers naturally rest against the back of the racket. This grip logic is highly consistent with the way Chinese people hold chopsticks. Just as using chopsticks relies on the coordinated control of the fingertips and finger pads to pick up food, the penhold grip can better utilize the physiological characteristics of Chinese people, whose hands are relatively small and whose fingertips are highly sensitive. Especially in techniques that require fine control, such as chopping, short pushes, and flicks, the penhold grip can quickly adjust the angle of the racket face through subtle wrist rotations, demonstrating a flexibility that is difficult for shakehand grips to match.

[0003] With the development of table tennis, Chinese athletes have gradually shifted to the shakehand grip, which is the mainstream grip style used by European and American athletes. The shakehand grip involves the entire palm wrapping around the handle and relying on the overall grip of the palm and the web of the thumb for power. This method is more suitable for European and American athletes with larger hands in terms of power transmission, and can release stronger hitting power when looping or smashing from a distance. It should be noted that the standard shakehand grip is approximately 10 cm long. While this fits the hand shape of European and American athletes, Chinese athletes generally have smaller hands (adult males typically have a hand length of 18-20 cm, and females 16-18 cm, 1-2 cm shorter than the average of European and American athletes). When using a shakehand grip, the palm cannot fully fit the 10 cm long grip, forcing them to rely on the gripping force of their fingers to maintain racket face stability. This results in a lack of flexibility in adjusting the racket angle through wrist rotation when handling short balls, unlike with a penhold grip. For example, when receiving a short ball, the 10 cm shakehand grip reduces the control torque of the fingers on the racket face to only about 70% of that with a penhold grip. Short shots are prone to racket face wobble, and the return trajectory is 2-3 cm higher than ideal, making it easy for the opponent to attack. Conversely, when attempting similar backhand topspin shots with a penhold grip, the width of the shakehand grip restricts the movement of the thumb and forefinger, making it difficult to replicate the delicate control of a penhold grip. Ultimately, this leads to a dilemma of "wanting to use the power of a shakehand grip but losing the flexibility of a penhold grip." At the same time, European athletes have actively adopted my country's traditional penhold technique, incorporating table control skills into their penhold playing style. In recent years, they have frequently won championships in international competitions, resulting in the weakening of my country's traditional penhold advantage and the awkward situation where athletes find it difficult to master both playing styles.

[0004] For table tennis beginners, the most difficult core problem to solve in the introductory stage is "difficulty in quickly determining their suitable playing style," which leads to many practical problems. For example, a teenager who was new to table tennis bought a standard shakehand grip (10 cm handle) after being influenced by fellow shakehand grip enthusiasts. After three months of practice, he found that his hand length was only 15 cm, and his thumb and forefinger could not grip the "waist" of the grip when he held the paddle. Every time he hit a ball from far away, he had to squeeze the grip tightly, resulting in sore forearm muscles. More importantly, because the 10 cm grip was not suitable for his hand size, the landing point deviation of his short flicks from the table was always more than 5 cm, making it difficult to meet the basic training requirements. It wasn't until he switched to a penhold grip of about 8 cm that his fingers could easily achieve the traditional grip method of "thumb and index finger gripping, and the last three fingers supporting," and he mastered the basic short flick from the table in just two weeks, reducing the landing point deviation to within 2 cm. However, the previously purchased shakehand racket was completely idle due to its unsuitability for the player's playing style. This not only resulted in a racket cost of nearly 300 yuan, but also caused unnecessary waste of resources such as wood and rubber from the idle racket. Similarly, a middle-aged enthusiast, wanting to train his child to play, purchased both a penhold and a shakehand racket for fear that the child would choose the wrong playing style. Ultimately, after the child determined that the penhold racket was suitable, the shakehand racket was stored for a long time, causing the rubber to age and lose elasticity, further exacerbating resource waste. It is worth noting that the core value of such convertible rackets lies in helping beginners complete "playing style trial and error and selection." Once the user has determined their preferred playing style, they still need to use the corresponding handle length for long-term specialized advanced training, making it impossible to achieve the effect of "simultaneously mastering both penhold and shakehand advanced techniques."

[0005] For athletes with a certain foundation, although a fixed grip length is necessary for advanced training, the existing fixed structure rackets still have indirect effects. For example, some athletes waste a lot of time adapting to an unsuitable playing style because they choose the wrong racket in the beginner stage, which leads to deviations in basic movements. It takes several months to correct these deviations. If the appropriate type can be quickly determined through convertible rackets in the early stages, the efficiency of advancement can be greatly improved.

[0006] Existing table tennis rackets all have a fixed structure, and their core drawback is that the handle length is not adjustable (about 8 cm for penhold and fixed at 10 cm for shakehand). This fails to meet the core need of beginners to "try and choose a playing style through the same racket": beginners need to blindly purchase multiple rackets of different types to determine suitability, which not only raises the economic threshold for entering table tennis but also causes serious waste of resources. At the same time, this fixed structure also makes it difficult for the traditional penhold playing style in my country to be effectively popularized among beginners due to the "high cost of trial and error," further exacerbating the weakening trend of traditional advantageous playing styles. Utility Model Content

[0007] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0008] Another objective of this invention is to provide a multi-functional table tennis racket that can switch between penhold and shakehand grips, enabling a quick and reliable transition between penhold and shakehand grips, thus solving the fundamental problem of the single-function nature of traditional rackets.

[0009] In order to achieve these objectives and other advantages according to the present invention, a multi-functional table tennis racket with vertical and horizontal conversion is provided, including a racket body and a racket handle, wherein the racket handle is provided with a fixed handle section and a movable handle section, the fixed handle section is fixedly connected to the racket body, and the movable handle section is axially movable and sleeved on the free end of the fixed handle section. The free end of the fixed handle section is provided with a cylindrical groove, and the outer end of the groove is provided with a retaining edge flush with the free end of the fixed handle section. The inner sidewall of the retaining edge is provided with multiple notches, and each notch has an inclined guide surface. A cylindrical through hole is coaxially formed in the movable handle section, and a button is fitted through the through hole. The inner wall of the through hole is provided with multiple sliding grooves, and multiple elastic cantilever beams are also connected to the inner wall of the through hole. The top of each elastic cantilever beam extends beyond the top of the movable handle section and is provided with a locking block. The side wall of the button is provided with multiple corresponding sliders that slide into the sliding grooves, and an elastic rope is connected between the side wall of the button and the multiple elastic cantilever beams. A spring is fitted around the outer periphery of the button, with the bottom end of the spring connected to the inner wall of the through hole and the top end of the spring connected to the side wall of the button. The movable handle segment is connected to the fixed handle segment, allowing multiple elastic cantilever beams to slide into the grooves through corresponding notches, and multiple locking blocks to be engaged in the locking edge. When the button is pressed, the elastic rope pulls the elastic cantilever beams, thereby causing the locking blocks to contract radially and allowing multiple locking blocks to slide out of the locking edge, thus realizing the conversion between vertical and horizontal shooting.

[0010] Preferably, the inner side of the locking edge is provided with a first locking tooth and a second locking tooth at intervals. When the movable handle is rotated relative to the fixed handle until either locking block abuts against the side of the first locking tooth, the locking block aligns with the notch. At this time, pressing the button can cause the locking block to retract radially and pass through the notch, thereby allowing the movable handle to move freely along the axial direction. When the movable handle rotates relative to the fixed handle until either locking block abuts against the side of the second locking tooth, the locking block is locked within the locking edge, thereby preventing the movable handle from moving axially.

[0011] Preferably, the pressing end of the button is flush with the tail end of the movable handle, the free end of the button extends beyond the mating end of the movable handle and the fixed handle, and the surface of the pressing end of the button is provided with anti-slip texture.

[0012] Preferably, multiple elastic cantilever beams are evenly distributed circumferentially, and the root of each elastic cantilever beam is integrally formed with the inner wall of the movable handle segment.

[0013] Preferably, each elastic cantilever beam is made of a highly elastic polymer material.

[0014] Preferably, both the fixed handle segment and the movable handle segment are covered with replaceable anti-slip sleeves.

[0015] Preferably, the surface of the anti-slip sleeve is provided with a raised or recessed pattern.

[0016] Preferably, the anti-slip sleeve is made of silicone or foam material.

[0017] This utility model offers at least the following advantages: The multi-functional table tennis racket with shakehand / penhold conversion, as described in this utility model, achieves the conversion between shakehand and penhold racket styles through a compact mechanism integrating a button, slide, slider, elastic cantilever beam, and elastic cord. This solves the fundamental problem of traditional rackets having only one function. Specifically, by setting a notch with a specific inclined guide surface and a locking edge with first and second locking teeth, a rotation locking mechanism is formed. This ensures that the handle can only be unlocked at a specific angle, effectively preventing accidental loosening or detachment due to accidental contact during intense exercise, significantly improving safety and stability during use.

[0018] In terms of operational details, the button is designed with the pressing end flush with the handle end, preventing accidental triggering during storage and gripping. Simultaneously, its free end extends inward, ensuring sufficient travel to reliably retract the locking blocks when pressed. Multiple flexible cantilever beams are circumferentially evenly distributed and integrally molded with the handle body. This ensures the synchronicity and consistency of all locking blocks during operation, preventing jamming or one-sided wear due to uneven force, thereby improving the overall efficiency and lifespan of the locking mechanism. These cantilever beams are made of highly elastic polymer material, enabling them to withstand repeated deformation without breaking or permanent deformation, ensuring long-term reliability.

[0019] Furthermore, a replaceable anti-slip sleeve is wrapped around the outside of the handle, directly solving the slippage problem caused by sweat and allowing users to change it according to their personal preferences, improving grip comfort and personalized experience. The textured surface of the anti-slip sleeve further increases the friction between the hand and the handle, making the grip more stable. The use of soft materials such as silicone or foam not only optimizes the feel but also effectively absorbs vibrations generated during impact, reducing user fatigue and enhancing the overall practicality and user experience of the racket.

[0020] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the structure of a multi-functional table tennis racket with vertical / horizontal conversion, according to one of the technical solutions of this utility model. Figure 2 This is a schematic diagram of the structure of the fixed handle segment in one of the technical solutions of this utility model; Figure 3 This is a schematic diagram of the structure of the movable handle segment in one of the technical solutions of this utility model; Figure 4 This is a schematic diagram of the slide groove in one of the technical solutions of this utility model; Figure 5 This is a schematic diagram of the button structure in one of the technical solutions of this utility model.

[0022] Among them, 100 is the racket body; 200 is the fixed handle section; 201 is the groove; 202 is the retaining edge; 203 is the notch; 204 is the inclined guide surface; 205 is the first retaining tooth; 206 is the second retaining tooth; 300 is the movable handle section; 301 is the through hole; 302 is the button; 303 is the slide groove; 304 is the elastic cantilever beam; 305 is the retaining block; 306 is the slider; 307 is the elastic rope; and 308 is the spring. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0024] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0025] like Figures 1-5 As shown, this utility model provides a multi-functional table tennis racket that can switch between straight and horizontal grips, including a racket body (100) and a handle. The handle is provided with a fixed handle section (200) and a movable handle section (300). The fixed handle section (200) is fixedly connected to the racket body (100), and the movable handle section (300) is axially movable and sleeved on the free end of the fixed handle section (200). The free end of the fixed handle segment (200) is provided with a cylindrical groove (201), and the outer end of the groove (201) is provided with a retaining edge (202) that is flush with the free end of the fixed handle segment (200). The inner sidewall of the retaining edge (202) is provided with multiple notches (203), and each notch (203) has an inclined guide surface (204). A cylindrical through hole (301) is coaxially opened in the movable handle section (300). A button (302) is fitted through the through hole (301). The inner wall of the through hole (301) is provided with multiple sliding grooves (303). The inner wall of the through hole (301) is also connected with multiple elastic cantilever beams (304). The top end of each elastic cantilever beam (304) extends beyond the top of the movable handle section (300) and is provided with a locking block (305). The side wall of the button (302) is provided with multiple corresponding sliders (306) that slide into the sliding grooves (303). An elastic rope (307) is connected between the side wall of the button (302) and the multiple elastic cantilever beams (304). A spring (308) is sleeved on the outer periphery of the button (302). The bottom end of the spring (308) is connected to the inner wall of the through hole (301), and the top end of the spring (308) is connected to the side wall of the button (302). The movable handle segment (300) is connected to the fixed handle segment (200), so that multiple elastic cantilever beams (304) slide into the groove (201) through the corresponding multiple notches (203), and multiple locking blocks (305) are locked in the locking edge (202). When the button (302) is pressed, the elastic rope (307) pulls the elastic cantilever beam (304), thereby driving the locking blocks (305) to retract radially, so that multiple locking blocks (305) slide out of the locking edge (202), thereby realizing the conversion between vertical and horizontal shooting.

[0026] In the above technical solution, regarding the basic structure of the racket body (100) and the handle, the racket body (100) can be made of five-layer plywood or composite material with added carbon fiber. The fixed handle section (200) of the handle is fixedly connected to the racket body (100). The movable handle section (300) is axially movable and sleeved on the free end of the fixed handle section (200). The assembly position of the fixed handle section (200) and the movable handle section (300) is such that the fixed handle section (200) is connected to the racket body (100) by adhesive bonding, and the movable handle section (300) is sleeved on the outside of the fixed handle section (200) by clearance fit, forming a detachable structure. Regarding the structure of the free end of the fixed handle section (200), a cylindrical groove (201) is machined inside the free end of the fixed handle section (200), a retaining edge (202) is located at the edge of the opening of the groove (201), and notches (203) are evenly distributed on the inner wall of the retaining edge (202). The tail end of the fixed handle segment (200) is also fitted with a detachable end cap. The end cap and the fixed handle segment (200) are connected by a cylindrical connector that matches the inner diameter of the clip. The end cap can be made of rubber.

[0027] Inside the movable handle section (300), a button (302) is fitted through a cylindrical through-hole (301). A groove (303) on the inner wall of the through-hole (301) is clearance-fitted with a slider (306) on the side wall of the button (302). An elastic cantilever beam (304) is evenly distributed circumferentially, and the top of its locking block (305) can be designed as a hemispherical shape. An elastic rope (307) connects the side wall of the button (302) to the elastic cantilever beam (304). A spring (308) is fitted around the outer periphery of the button (302). The assembly position of these components is such that the button (302) is placed inside the through-hole (301) of the movable handle section (300), the spring (308) is located between the button (302) and the inner wall of the through-hole (301), the elastic cantilever beam (304) is evenly distributed circumferentially, and the elastic rope (307) connects the upper part of the button (302) to the middle part of the cantilever beam.

[0028] The mechanism operates as follows: When a horizontal racket is needed, the movable handle (300) is aligned with the fixed handle (200). The locking block (305) at the top of the elastic cantilever beam (304) slides into the groove (201) along the inclined guide surface (204) of the notch (203). Under elastic action, the locking block (305) opens outward and locks into the inner side of the locking edge (202). When a vertical racket is needed, the button (302) is pressed to move it axially. The button (302) slides in the groove (303) via the slider (306), while the elastic rope (307) pulls the elastic cantilever beam (304) towards the center, causing the locking block (305) to retract radially. When the locking block (305) is completely disengaged from the locking edge (202), the movable handle (300) can move freely axially, separating it from the fixed handle (200), thus realizing the conversion between the vertical and horizontal racket types. After the button (302) is released, the spring (308) pushes the button (302) to reset, and the elastic cantilever beam (304) returns to its original state under its own elasticity, causing the locking block (305) to open again.

[0029] Through the above structural design, the ping-pong paddle can achieve a stable switching function. The fit gap between the fixed handle section (200) and the movable handle section (300) ensures smooth axial movement, while the structure of the groove (201) and the locking edge (202) provides a reliable locking position. The control mechanism inside the movable handle section (300) realizes the synchronous contraction and opening of the locking block (305) through mechanical linkage, ensuring the reliability of the switching operation.

[0030] In another technical solution, the inner side of the locking edge (202) is provided with a first locking tooth (205) and a second locking tooth (206) at intervals. When the movable handle segment (300) rotates relative to the fixed handle segment (200) until any locking block (305) abuts against one side of the first locking tooth (205), the locking block (305) aligns with the notch (203). At this time, pressing the button (302) can cause the locking block (305) to retract radially and pass through the notch (203), thereby allowing the movable handle segment (300) to move freely along the axial direction. When the movable handle (300) rotates relative to the fixed handle (200) until either of the locking blocks (305) abuts against one side of the second locking tooth (206), the locking block (305) is locked in the locking edge (202), thereby preventing the movable handle (300) from moving axially.

[0031] In the above technical solution, first locking teeth (205) and second locking teeth (206) can be provided at intervals on the inner side of the locking edge (202). These locking teeth can be integrally molded with the locking edge (202) using the same material, such as ABS engineering plastic. The number of first locking teeth (205) and second locking teeth (206) can each be three, evenly distributed along the circumference. The tooth surfaces of the first locking teeth (205) and second locking teeth (206) can be designed as vertical surfaces, forming a 90-degree angle with the inner wall of the locking edge (202). The height of the locking teeth can be set to 1.5 mm and the width to 3 mm. The mounting position of these locking teeth is on the inner side of the locking edge (202) at the free end of the fixed shank segment (200), alternating with the notch (203).

[0032] When the movable handle segment (300) rotates relative to the fixed handle segment (200), when either locking block (305) abuts against one side of the first locking tooth (205), the locking block (305) and the notch (203) are fully aligned. When either locking block (305) abuts against one side of the second locking tooth (206), the locking block (305) is blocked by the locking edge (202) and cannot slide off the locking edge (202). The rotational positioning of the movable handle segment (300) can be achieved through the cooperation of the locking block (305) and the locking tooth.

[0033] During operation, when the movable handle (300) rotates until the locking block (305) contacts the first locking tooth (205), the locking block (305) aligns with the notch (203). Pressing the button (302) at this time causes the elastic cantilever beam (304) to bend under force, and the locking block (305) to contract radially by 1.5 mm, allowing it to pass smoothly through the 5 mm wide notch (203), thus giving the movable handle (300) axial freedom of movement. When the movable handle (300) rotates until the locking block (305) contacts the second locking tooth (206), the vertical tooth surface of the second locking tooth (206) blocks the radial movement path of the locking block (305). Even if the button (302) is pressed at this time, the radial contraction movement of the locking block (305) is restricted by the locking edge (202), preventing it from reaching the minimum contraction required to pass through the locking edge (202), thus maintaining a locked state.

[0034] By incorporating locking teeth, selective control of the axial movement of the movable handle segment (300) is achieved. The design of the first locking tooth (205) facilitates the alignment of the locking block (305) with the notch (203), providing guidance for the switching operation; the second locking tooth (206) forms an effective mechanical barrier to prevent accidental unlocking. This structure requires a specific combination of rotation and pressing actions to complete the grip switching, reducing the possibility of misoperation while maintaining the orderliness and reliability of the operation.

[0035] In another technical solution, the pressing end of the button (302) is flush with the tail end of the movable handle (300), the free end of the button (302) extends beyond the mating end of the movable handle (300) and the fixed handle (200), and the pressing end surface of the button (302) is provided with anti-slip texture.

[0036] In the above technical solution, the pressing end of the button (302) can be designed to be flush with the tail end of the movable handle (300), and the height difference can be controlled within ±0.2 mm. The total length of the button (302) can be set to 25 mm, of which the thickness of the pressing end is 3 mm. The button (302) can be made of ABS engineering plastic, and its surface hardness can reach Rockwell hardness R115. The assembly position of the button (302) and the tail end of the movable handle (300) is such that the button (302) protrudes from the inside of the movable handle (300), and the outer surface of its pressing end is on the same plane as the tail end surface of the movable handle (300) or slightly recessed, with a recess depth not exceeding 0.2 mm.

[0037] The free end of the button (302) can extend beyond the mating end of the movable handle segment (300) and the fixed handle segment (200), and the extension length can be set to 2 mm. A connecting hole can be provided inside the button (302) for fixing the elastic cord (307). The button (302) is assembled in such a way that its free end is always located inside the movable handle segment (300), and can move towards the fixed handle segment (200) when pressed, with a maximum movement distance limited to 3 mm.

[0038] The surface of the button (302) can be provided with anti-slip texture. The texture can be a ring groove or a dotted raised array. The anti-slip texture can be directly made on the surface of the button (302) by injection molding or by subsequent machining. The material of the button (302) can be a plastic with a high coefficient of friction, such as nylon with added glass fiber, whose surface friction coefficient can reach 0.4.

[0039] During operation, when a change in grip is required, the user rotates the movable handle (300) to make the locking block (305) abut against the first locking tooth (205), thereby aligning with the notch (203) and pressing the pressing end of the button (302). Since the pressing end is flush with the tail end of the movable handle (300), the user's fingers can accurately find the pressing position and apply force. The anti-slip texture increases the friction between the fingers and the surface of the button (302), preventing slippage during pressing. After being subjected to force, the button (302) moves axially, and its free end displaces towards the fixed handle (200). Through the elastic rope (307), the elastic cantilever beam (304) is pulled to produce radial contraction, thereby disassembling the movable handle (300) and separating it from the fixed handle (200).

[0040] By optimizing the positional relationship and surface finish of the button (302), the ease and accuracy of operation are improved. The flush design of the button (302) with the end of the handle reduces the possibility of accidental triggering while maintaining the integrity of the handle's appearance. The appropriate extension of the free end of the button (302) ensures sufficient pressing travel, enabling the locking mechanism to operate reliably. The anti-slip texture improves the feel when pressing, making the operation more firm and powerful. These design features collectively enhance the user experience and reliability of the entire switching mechanism.

[0041] In another technical solution, multiple elastic cantilever beams (304) are evenly distributed circumferentially, and the root of each elastic cantilever beam (304) is integrally formed with the inner wall of the movable handle segment (300).

[0042] In the above technical solution, the number of elastic cantilever beams (304) can be selected as three or four, evenly distributed circumferentially. When three cantilever beams are used, the included angle between adjacent cantilever beams is 120 degrees; when four cantilever beams are used, the included angle between adjacent cantilever beams is 90 degrees. The thickness of each elastic cantilever beam (304) can be set to 1.2 mm, the width to 3.5 mm, and the length of the free end to 15 mm. The radius of the transition fillet connecting the root of the cantilever beam to the inner wall of the movable handle section (300) can be set to 1.5 mm to reduce stress concentration. The width of the locking block (305) set at the top of the free end of the cantilever beam can be slightly larger than the cantilever beam body, reaching 4 mm, and the height of the locking block (305) is 2 mm. The assembly position of these cantilever beams is on the inner wall of the through hole (301) of the movable handle section (300), evenly arranged circumferentially, with their roots firmly connected to the inner wall of the movable handle section (300), and their free ends extending towards the fixed handle section (200).

[0043] The flexible cantilever beam (304) and the movable stem segment (300) can be manufactured using an integral injection molding process, and can be made of the same engineering plastic material, such as polyoxymethylene or reinforced nylon. The connection part at the root of the cantilever beam can be designed as a gradually thickening transition structure, with the length of the transition area set to 3 mm and the thickness gradually increasing from 1.2 mm on the cantilever beam body to the same 3 mm as the inner wall of the movable stem segment (300). The inner wall of the movable stem segment (300) can be provided with reinforcing ribs at the connection area at the root of the cantilever beam. The height of the reinforcing ribs can be set to 1 mm and the width to 2 mm to enhance the connection strength. The materials of the cantilever beam and the movable stem segment (300) can be selected from plastics with good fatigue resistance, and their elastic modulus can be controlled within the range of 2.5 GPa to 3.0 GPa.

[0044] During operation, when button (302) is pressed, elastic rope (307) pulls the middle part of multiple elastic cantilever beams (304). Since the cantilever beams are evenly distributed circumferentially, each cantilever beam is subjected to uniform force and can synchronously generate radial bending deformation, thereby slipping and separating the fixed handle section (200) from the notch (203). The integral molding structure of the cantilever beam root and the inner wall of the movable handle section (300) ensures that it will not loosen or fall off during repeated bending deformation. When the cantilever beam bends, the stress distribution in the transition area at its root is relatively gentle, and the maximum stress value can be controlled below 50% of the material yield strength through finite element analysis.

[0045] The cantilever beam layout with evenly distributed circumferential force ensures that each locking block (305) experiences balanced force and synchronized movement during locking and unlocking, avoiding jamming or unilateral wear caused by uneven force distribution. The one-piece molding design eliminates assembly gaps, improves structural integrity and connection reliability, reduces the number of parts, and simplifies the manufacturing process. This structural layout makes the locking mechanism more stable and reliable during operation, contributing to extended service life.

[0046] In another technical solution, each elastic cantilever beam (304) is made of a highly elastic polymer material.

[0047] In the above technical solutions, the elastic cantilever beam (304) can be made of various highly elastic polymer materials, among which polyoxymethylene is a common choice, and its elastic modulus can be controlled within the range of 2.5GPa to 3.2GPa. Reinforced nylon materials can also be used, in which 15% to 30% glass fiber reinforcement can be added, and its tensile strength can reach over 80MPa. Another optional material is thermoplastic polyurethane, whose elongation at break can reach over 300%. The Shore hardness of these materials can be selected between D75 and D85, which can meet the elastic recovery requirements of the cantilever beam during repeated bending deformation. The fatigue life of the material can be tested by rotational bending fatigue testing, and it can withstand more than 100,000 cycles of load under the condition of a maximum bending strain of 0.5%.

[0048] Regarding material properties, the flexural strength of the cantilever beam material can be set to no less than 90 MPa, and the flexural modulus to no less than 2.8 GPa. The impact strength can be determined using the simply supported beam impact test method, and can be no less than 8 kJ / m². 2 The creep properties of the materials can be tested under conditions of 23 degrees Celsius and 20 MPa stress, with a creep variation of no more than 0.5% after 24 hours. The heat distortion temperature of these polymer materials can reach above 120 degrees Celsius, and the Vicat softening point can be controlled at around 140 degrees Celsius. The water absorption rate of the materials can be controlled below 0.8% to avoid significant changes in dimensional stability and mechanical properties due to humidity variations.

[0049] During operation, when the button (302) is pressed, the elastic rope (307) applies radial tension to the cantilever beam, causing it to bend and deform. The maximum bending strain can be controlled within 60% of the material's yield strain. Due to the excellent elastic recovery characteristics of the highly elastic polymer material, it can maintain stable mechanical properties during repeated deformation. When the cantilever beam bends, the maximum stress on its surface can be calculated using material mechanics formulas to ensure that it does not exceed the material's fatigue limit. When the external force is released, the cantilever beam, relying on the material's own elastic memory effect, can quickly restore its original shape, causing the locking block (305) to accurately reset.

[0050] This structure utilizes a highly elastic polymer material with specific mechanical properties, enabling the elastic cantilever beam (304) to maintain stable elastic deformation capacity during long-term use. The material's appropriate elastic modulus ensures the cantilever beam has sufficient stiffness to maintain the locked state, while also possessing the necessary flexibility to achieve smooth radial contraction. The material's excellent fatigue resistance ensures the cantilever beam can withstand frequent bending deformation without fracture or permanent deformation, thereby improving the service life and reliability of the entire locking mechanism.

[0051] In another technical solution, the outer periphery of both the fixed handle segment (200) and the movable handle segment (300) is covered with a replaceable anti-slip sleeve.

[0052] In the above technical solution, the thickness of the anti-slip sleeve can be set to 1.5 mm to 2.0 mm, and the length can be matched according to the size of the handle segment. The length of the anti-slip sleeve for the fixed handle segment (200) can be set to 70 mm, and the length of the anti-slip sleeve for the movable handle segment (300) can be set to 60 mm. The inner diameter of the anti-slip sleeve can be 0.3 mm to 0.5 mm smaller than the outer diameter of the corresponding handle segment to form an interference fit. The two ends of the anti-slip sleeve can be provided with a gradually thinning transition area, and the length of the transition area can be set to 5 mm. The inner wall of the anti-slip sleeve can be designed with annular anti-slip protrusions, the height of which can be set to 0.2 mm, the width to 1 mm, and the distance between adjacent protrusions to 2 mm. The assembly position of these anti-slip sleeves is to tightly wrap around the outer peripheral surface of the fixed handle segment (200) and the movable handle segment (300), and their ends are flush with or slightly exceed the ends of the handle segments, with the excess not exceeding 1 mm.

[0053] The anti-slip sleeve can be detachably connected, with an adhesive layer on the inner wall of the sleeve. The adhesive layer thickness can be set to 0.1 mm, using removable pressure-sensitive adhesive. Alternatively, a connecting mechanism can be installed at the joint of the anti-slip sleeve, using a Velcro structure. The hook width of the Velcro can be set to 3 mm, and the corresponding rough side width to 5 mm. An elastic tightening band can also be installed at the end of the anti-slip sleeve, with a width of 8 mm and a thickness of 0.8 mm. The material of the anti-slip sleeve can be a thermoplastic elastomer with a Shore A hardness controlled between 50 and 60 and a tensile strength of not less than 10 MPa.

[0054] During operation, when the anti-slip sleeve needs to be replaced, the user can remove the old anti-slip sleeve from the handle section axially. Because the anti-slip sleeve material has a certain degree of elasticity and ductility, it will not tear or permanently deform during disassembly. When installing a new anti-slip sleeve, first align the anti-slip sleeve with the end of the handle section, and then slowly push it in axially. The design of the anti-slip sleeve's inner diameter being slightly smaller than the handle section's outer diameter ensures a tight fit after assembly, preventing slippage or rotation during use. The annular protrusions on the inner wall of the anti-slip sleeve further enhance the bonding force with the handle section surface and facilitate precise positioning.

[0055] This design provides users with convenient maintenance and personalization options by wrapping the handle with a replaceable anti-slip sleeve. When the anti-slip sleeve becomes worn, dirty, or aged due to long-term use, it can be replaced individually without replacing the entire handle, reducing maintenance costs. Different users can choose anti-slip sleeves of different materials, colors, or surface textures according to their personal preferences, enhancing the personalized experience. The reliable connection between the anti-slip sleeve and the handle ensures that it will not accidentally fall off during use, while maintaining grip comfort and stability.

[0056] In another technical solution, the surface of the anti-slip sleeve is provided with a raised or recessed pattern.

[0057] In the above technical solutions, the raised and recessed patterns on the surface of the anti-slip sleeve can take various forms. A wavy pattern can be used, with a peak height of 0.8 mm, a corresponding trough depth of 0.8 mm, and a wavelength of 3 mm. Alternatively, a matrix of dotted protrusions can be used, with a protrusion diameter of 1.2 mm, a height of 0.5 mm, and a center-to-center distance of 2.5 mm between adjacent protrusions. Another option is a diamond grid pattern, with a grid line width of 1 mm, a depth of 0.4 mm, and a diagonal length of 5 mm for each diamond unit. These raised and recessed patterns can be directly molded onto the surface of the anti-slip sleeve, or they can be formed on a finished anti-slip sleeve through machining.

[0058] The structural parameters of the raised pattern can be adjusted according to usage requirements. The top of the raised portion can be designed as a flat surface, with rounded edges. The depth-to-width ratio of the pattern can be controlled between 1:2 and 1:3, ensuring sufficient friction while facilitating cleaning and maintenance. The spacing between pattern units can be uniformly set to 1 mm to ensure even distribution.

[0059] The raised and recessed patterns on the surface of the anti-slip sleeve can cover the main gripping area. The pattern density can be appropriately increased in the middle of the sleeve, with 20 raised bumps per square centimeter. The pattern density can gradually decrease towards the ends of the sleeve, with the transition area length set at 15 millimeters. The pattern arrangement direction can be designed based on grip mechanics analysis; a 45-degree diagonal arrangement can be used in the thumb-pressing area, while a vertical arrangement can be used in the finger-wrapping area. The pattern depth gradually decreases from the middle to both ends of the sleeve, with a decrease gradient of 0.1 millimeters per 10 millimeters of depth.

[0060] During operation, when the user holds the racket handle, the skin of the hand makes full contact with the raised patterns on the surface of the anti-slip sleeve. The raised parts provide appropriate pressure to the skin, increasing the local pressure at the contact points. When swinging the racket to hit the ball, the additional friction generated by the raised patterns effectively resists relative slippage between the hand and the racket handle, especially when the hands are sweaty, preventing the formation of a continuous film of water that could cause slippage.

[0061] This structure significantly increases the static friction coefficient between the hand and the handle by setting a specific embossed pattern on the surface of the anti-slip sleeve. The reasonable layout of the pattern ensures effective anti-slip protection in the main force-bearing areas, while taking into account the mechanical distribution characteristics under different grip postures. The appropriate pattern depth and spacing design provides sufficient friction while avoiding discomfort caused by an excessively deep pattern. This surface treatment helps improve the control stability of the handle during hitting the ball and reduces technical errors caused by hand slippage.

[0062] In another technical solution, the anti-slip sleeve can be made of silicone material, with a Shore A hardness of 30 to 50 and a density between 1.1 and 1.3 g / cm³. Alternatively, foam material can be used, with polyurethane foam being a common choice. Its density can be controlled within the range of 25 to 45 kg / m³, and its resilience rate can be no less than 60%. The thickness of the silicone material can be set to 1.8 mm, while the foam material can be slightly thicker, reaching 2.2 mm. The surface friction coefficient of these materials can be measured using a static friction coefficient tester, and should be no less than 0.6 in a dry state and above 0.4 in a wet state. The tear strength of the material should be no less than 15 kN / m to ensure that it will not break due to localized stress during use.

[0063] Silicone materials can be processed using liquid silicone injection molding, with molding temperatures controlled between 160 and 180 degrees Celsius and a holding time of 30 seconds. Foam materials can be manufactured using compression molding, with a foaming ratio controlled between 3 and 5 times and a foaming temperature set between 120 and 140 degrees Celsius. Appropriate amounts of color masterbatch can be added to the materials to obtain the desired color; the addition ratio of color masterbatch can be controlled between 1% and 3%. Fumed silica can be used as a reinforcing agent for silicone materials, with an addition amount set to 10%. Appropriate amounts of ultraviolet absorbers can be added to foam materials, with an addition amount set to 0.5%, to improve weather resistance.

[0064] During operation, when the user grips the handle, the silicone or foam material effectively conforms to the curves of the hand, providing even support. Silicone, due to its high density and resilience, offers clear tactile feedback; foam, with its porous structure, has better compressibility and can distribute hand pressure effectively. Over extended use, these materials effectively absorb vibrations generated during impact; the vibration decay time can be measured using a dynamic mechanical analyzer, and the vibration transmissibility in the main frequency bands can be controlled below 0.7. The materials' sweat resistance can be evaluated through artificial sweat immersion tests; after 24 hours of immersion, the weight change rate does not exceed 2%, and the mechanical property retention rate is not less than 90%.

[0065] This structure, through the selection of silicone or foam materials with specific physical properties, allows the anti-slip sleeve to provide effective friction while also improving grip comfort. The appropriate hardness and elasticity of the material reduce hand fatigue while ensuring support, and its excellent shock absorption helps reduce the impact force transmitted to the arm during impact. The stable physicochemical properties of the material ensure that the anti-slip sleeve maintains its original functional characteristics during long-term use and is not prone to aging and failure due to environmental factors. This material selection allows the anti-slip sleeve to meet basic functional requirements while enhancing the overall user experience.

[0066] To further enhance the overall aesthetics, usability, and ease of maintenance of the multi-functional table tennis racket with vertical / horizontal conversion capability, a detachable end cap is fitted to the tail end of the fixed handle section (200). This end cap design not only seals the tail structure of the fixed handle section and enhances its appearance, but also effectively prevents dust, sweat, and other foreign matter from entering the internal groove (201) and retaining edge (202) areas of the fixed handle section, thereby protecting the cleanliness and normal function of the internal mechanism. Specifically, the end cap adopts a cylindrical structure matching the outer diameter of the fixed handle section (200), and its inner wall can be provided with an annular groove or threaded structure to achieve reliable connection and convenient disassembly with the tail end of the fixed handle section. The outer surface of the end cap can be coordinated with the overall style of the racket handle and can be injection molded from polymer materials of the same or contrasting colors.

[0067] The number of devices and processing capacity described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of the multi-functional table tennis racket with vertical / horizontal conversion of this utility model will be readily apparent to those skilled in the art.

[0068] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A multi-functional table tennis racket that can be switched between penhold and shakehand orientations, characterized in that: It includes a racket body and a racket handle. The racket handle is provided with a fixed handle section and a movable handle section. The fixed handle section is fixedly connected to the racket body, and the movable handle section is axially movable and sleeved on the free end of the fixed handle section. The free end of the fixed handle section is provided with a cylindrical groove, and the outer end of the groove is provided with a retaining edge flush with the free end of the fixed handle section. The inner sidewall of the retaining edge is provided with multiple notches, and each notch has an inclined guide surface. A cylindrical through hole is coaxially formed in the movable handle section, and a button is fitted through the through hole. The inner wall of the through hole is provided with multiple sliding grooves, and multiple elastic cantilever beams are also connected to the inner wall of the through hole. The top of each elastic cantilever beam extends beyond the top of the movable handle section and is provided with a locking block. The side wall of the button is provided with multiple corresponding sliders that slide into the sliding grooves, and an elastic rope is connected between the side wall of the button and the multiple elastic cantilever beams. A spring is fitted around the outer periphery of the button, with the bottom end of the spring connected to the inner wall of the through hole and the top end of the spring connected to the side wall of the button. The movable handle segment is connected to the fixed handle segment, allowing multiple elastic cantilever beams to slide into the grooves through corresponding notches, and multiple locking blocks to be engaged in the locking edge. When the button is pressed, the elastic rope pulls the elastic cantilever beams, thereby causing the locking blocks to contract radially and allowing multiple locking blocks to slide out of the locking edge, thus realizing the conversion between vertical and horizontal shooting.

2. The multi-functional table tennis racket with vertical / horizontal conversion as described in claim 1, characterized in that, The inner side of the locking edge is provided with a first locking tooth and a second locking tooth at intervals. When the movable handle is rotated relative to the fixed handle until either locking block abuts against the side of the first locking tooth, the locking block aligns with the notch. At this time, pressing the button can cause the locking block to retract radially and pass through the notch, thereby allowing the movable handle to move freely along the axial direction. When the movable handle rotates relative to the fixed handle until either locking block abuts against the side of the second locking tooth, the locking block is locked within the locking edge, thereby preventing the movable handle from moving axially.

3. The multi-functional table tennis racket with vertical / horizontal conversion as described in claim 1, characterized in that, The pressing end of the button is flush with the tail end of the movable handle, the free end of the button extends beyond the mating end of the movable handle and the fixed handle, and the surface of the pressing end of the button is provided with anti-slip texture.

4. The multi-functional table tennis racket with vertical / horizontal conversion as described in claim 1, characterized in that, Multiple elastic cantilever beams are evenly distributed circumferentially, and the root of each elastic cantilever beam is integrally formed with the inner wall of the movable handle segment.

5. The multi-functional table tennis racket with vertical / horizontal conversion as described in claim 1, characterized in that, Each elastic cantilever beam is made of a highly elastic polymer material.

6. The multi-functional table tennis racket with vertical / horizontal conversion as described in claim 1, characterized in that, Both the fixed and movable handle sections are covered with replaceable anti-slip sleeves.

7. The multi-functional table tennis racket with vertical / horizontal conversion as described in claim 6, characterized in that, The surface of the anti-slip sleeve is decorated with embossed patterns.

8. The multi-functional table tennis racket with vertical / horizontal conversion as described in claim 7, characterized in that, The anti-slip sleeve is made of silicone or foam material.

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