Telescopic golf practice club

Abstract

The application provides a telescopic golf practice rod, relates to the technical field of sports training equipment, and solves the problem of inconvenient carrying of the golf practice rod with an integrated rod body. The golf practice rod comprises a first handle, a second handle and a rod head, the first handle, the second handle and the rod head are sequentially nested, the first handle and the second handle and the second handle and the rod head can slide relative to each other under the action of external force, so that the practice rod is in a fully stretched state or a contracted state; the first handle and the second handle and the second handle and the rod head are all provided with limiting structures, when the practice rod is in the fully stretched state, all the limiting structures are used to realize axial self-locking between the first handle, the second handle and the rod head. The telescopic positioning and anti-loosening functions can be realized without an additional complex locking mechanism, so that the product reliability is improved, the practice rod is convenient to store and carry when not in use, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of sports training equipment technology, and in particular to a retractable golf practice club. Background Technology

[0002] Golf demands a high degree of consistency in the rhythm, trajectory, and force of the swing. Therefore, golf practice clubs are widely used as daily training equipment for swing technique development, rhythm control, and basic strength training.

[0003] Currently, most golf practice clubs on the market use a one-piece, fixed-length shaft structure to simulate the length and center of gravity distribution of a standard club, ensuring the mechanical realism and consistent feel of the swing training.

[0004] The applicant has discovered that the existing technology has at least the following technical problems: Traditional golf practice clubs are limited by their one-piece fixed shaft structure, and their overall length is usually comparable to that of a standard golf club, making it impossible to shorten or fold them for storage. In outdoor training or home scenarios with limited storage space, they are extremely inconvenient to carry, take up a lot of space, and cannot meet the flexible and high-frequency training needs of modern users. Summary of the Invention

[0005] The purpose of this invention is to provide a retractable golf practice club to solve the technical problem of inconvenient carrying of existing golf practice clubs with a one-piece structure. The various technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The retractable golf practice club provided by this invention includes a first handle, a second handle, and a clubhead, wherein: The first handle, the second handle, and the rod head are nested in sequence. The first handle and the second handle, and the second handle and the rod head, can slide relative to each other under the action of external force, so that the exercise bar is in a fully extended state or a retracted state. Limiting structures are provided between the first handle and the second handle, and between the second handle and the club head. When the practice bar is in a fully extended state, all the limiting structures are used to achieve axial self-locking between the first handle, the second handle and the club head.

[0007] Preferably, the limiting structure includes a tapered limiting end and an inner tapered cavity, wherein: Of the conical limiting end and the inner conical cavity, one is disposed at the connecting end of the first handle, and the other is disposed at the end of the second handle connected to the first handle. Alternatively, one of the tapered limiting end and the inner tapered cavity may be disposed at the connecting end of the rod head, and the other may be disposed at the end where the second handle is connected to the rod head. The conical limiting end and the inner conical cavity are arranged coaxially, and the outer diameter tapering direction of the conical limiting end is opposite to the inner diameter tapering direction of the inner conical cavity. When the exercise bar is in its fully extended state, the conical limiting end is located in the inner conical cavity. The conical limiting end and the inner conical cavity generate radial extrusion force under axial force, thereby wedging and self-locking.

[0008] Preferably, the outer surface of the conical limiting end is a conical transition surface, and the cone angle of the conical transition surface is 2° to 6°; The cone angle of the inner conical cavity wall is equal to the cone angle of the conical transition surface.

[0009] Preferably, the practice lever further includes a counter, the counter comprising a housing, a battery, a gyroscope module, a main control unit, and a wireless transmission module connected in sequence within the housing, wherein: The housing is fixed inside the clubhead. The gyroscope module is configured to collect swing motion data in real time. The main control unit identifies the complete swing action based on the swing motion data and generates a swing count. The wireless transmission module is used to send the swing count to an external mobile terminal.

[0010] Preferably, the rod head is provided with a mounting groove, the opening of the mounting groove extending to the outer surface of the rod head; The housing is provided with a cover. When the housing is assembled in the mounting groove, the cover is fastened to the opening of the mounting groove and the mounting groove is closed.

[0011] Preferably, the first handle includes a grip portion, which is fixedly connected to the tapered limiting end. The outer diameter of the tapered limiting end gradually increases in the direction away from the grip portion, and the outer diameter of the grip portion is smaller than the outer diameter of the wide end of the tapered limiting end.

[0012] Preferably, the first handle further includes a stop end, which is fixed to one end of the grip portion away from the tapered limiting end, and the outer diameter of the stop end is larger than the outer diameter of the grip portion.

[0013] Preferably, the rod head includes a rod body and a counterweight head, the counterweight head is fixed to the end of the rod body away from the second handle, the outer contour of the counterweight head is arc-shaped, and a counterweight whip is fixedly connected to the counterweight head.

[0014] Preferably, the outer edge of the counterweight head is provided with a mounting hole, the mounting hole is located on the side of the counterweight head away from the rod body, and the counterweight whip is bound and fixed at the mounting hole; The number of mounting holes is one or more. When the number of mounting holes is two or more, all the mounting holes are arranged at intervals along the outer arc contour of the rod head.

[0015] Preferably, the first handle, the second handle, and the rod head are sequentially telescopically connected along the same central axis. The first handle, the second handle, and the rod head are all flat structures, and their flat main surfaces are parallel to each other and located in the same reference plane.

[0016] Preferably, the main control unit is further configured as follows: Based on the triaxial angular velocity data and / or acceleration data collected by the gyroscope module, calculate the swing speed and swing force for each swing; Based on the time series characteristics of the triaxial angular velocity data, identify the swing trajectory type for each swing; Based on the swing speed, the swing force, and the preset metabolic equivalent parameters, calculate the calorie consumption for each swing and the cumulative training process; The main control unit calculates calorie consumption values ​​in the following ways: The main control unit calculates the calorie consumption of a single swing according to the following formula: Esingle= MET×W×Tswing / 3600; Where, Esingle is the calorie consumption value of a single swing, in kilocalories; MET is the metabolic equivalent coefficient corresponding to the swing action, which is retrieved from a preset metabolic equivalent mapping table based on the swing speed; W is the user's weight, in kilograms; Tswing is the effective duration of a single swing, in seconds; The main control unit sums up the calorie consumption values ​​of all single swings during the training process to obtain the cumulative calorie consumption value.

[0017] Preferably, the counter further includes a storage module, which is electrically connected to the main control unit; The storage module is configured to store training data records, which include at least two of the following information: swing count, swing speed for each swing, swing power for each swing, swing trajectory type, calorie consumption, training start time, training end time, and training duration. The main control unit is configured to classify and store the training data records according to training date and / or training session, and generate training statistics reports; The training statistics report includes at least two of the following information: total number of swings per day, average swing speed, maximum swing speed, average swing power, trajectory deviation trend, cumulative calorie consumption, and training frequency statistics.

[0018] The retractable golf practice club provided by this invention has the following advantages compared with the prior art: When the first handle and the second handle, and the second handle and the clubhead are stretched outward to a predetermined position, all limiting structures are used to achieve axial self-locking among the three components. During practice, radial compressive force is generated under axial force, making the first handle and the second handle, and the second handle and the clubhead tightly locked together, thereby achieving stable positioning. That is, under the action of the inertial force generated by the swing, no two of the three components will loosen or retract, thus improving the overall structural stability. This invention achieves telescopic positioning and anti-loosening function without the need for additional complex locking mechanisms, thereby improving product reliability, facilitating storage and carrying when not in use, and reducing manufacturing costs. Attached Figure Description

[0019] 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the retractable golf practice club in its fully extended state in this embodiment; Figure 2 This is a cross-sectional view of a retractable golf practice club in its fully extended state. Figure 3 This is a schematic diagram of the decomposed structure of the counter; Figure 4 This is a schematic diagram of the retractable golf practice club in the retracted state in this embodiment; Figure 5 This is a schematic diagram of the mounting groove on the rod head.

[0021] In the diagram: 1. First handle; 11. Grip; 12. Stop end; 2. Second handle; 3. Rod head; 301. Mounting slot; 31. Rod body; 32. Counterweight head; 4. Limiting structure; 41. Conical limiting end; 42. Inner conical cavity; 5. Counter; 51. Housing; 52. Battery; 53. Gyroscope module; 54. Wireless transmission module; 55. Cover; 6. Counterweight whip; 7. Mounting hole; 8. Friction protrusion. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] In the description of this invention, it should be understood that the terms "center," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] Traditional golf practice clubs use a one-piece, fixed-length shaft structure, with an overall length similar to standard golf clubs, making it impossible to retract or fold for storage. This results in inconvenience in carrying and storing practice clubs in outdoor training or home scenarios with limited storage space, as they take up a lot of space and fail to meet the modern user's demand for flexibility and portability in training equipment.

[0025] To address the aforementioned issues, this invention provides a retractable golf practice club that enables telescopic positioning and anti-loosening functions, thereby improving product reliability, facilitating storage and carrying when not in use, and reducing manufacturing costs.

[0026] The following is combined with Figures 1-5 The technical solution provided by this invention will be described in more detail below.

[0027] See Figures 1-5 As shown, the retractable golf practice club provided by the present invention includes a first handle 1, a second handle 2, and a club head 3, wherein: the first handle 1, the second handle 2, and the club head 3 are nested in sequence, and the first handle 1 and the second handle 2, and the second handle 2 and the club head 3 can slide relative to each other under the action of external force, so that the practice club is in a fully extended state or a retracted state; a limiting structure 4 is provided between the first handle 1 and the second handle 2, and between the second handle 2 and the club head 3, and when the practice club is in a fully extended state, all the limiting structures 4 are used to achieve axial self-locking between the first handle 1, the second handle 2, and the club head 3.

[0028] It should be understood that the retractable golf practice club in this embodiment is intended as a daily training tool for swing technique development, rhythm control, and basic strength training. It is preferably used for training purposes rather than as a standard golf club on a course. The first handle 1 is the part held by the user, the second handle 2 serves as the intermediate connecting section, and the clubhead 3 is a component that simulates the striking part of a golf club.

[0029] Among them, see Figure 1 Fully extended refers to the practice club being stretched to its maximum working length, simulating the length of a standard golf club. See also Figure 4 The retracted state refers to the fact that each component is pushed in or retracted to its minimum length, making it easy to carry and store.

[0030] The practice bar in this embodiment can switch between a fully extended state and a retracted state. For example, the user can move it axially relative to the first handle 1, the second handle 2, and the bar head 3 by pulling or pushing them. See also Figure 1 When all parts are fully pulled out, the exercise bar is in its fully extended state; see also Figure 4 When all parts are fully pushed in, the exercise bar is in a retracted state.

[0031] This embodiment provides a specific implementation of the limiting structure 4: see [link / reference] Figure 1 and Figure 2 As shown, the limiting structure 4 includes a tapered limiting end 41 and an inner tapered cavity 42, wherein: one of the tapered limiting end 41 and the inner tapered cavity 42 is located at the connecting end of the first handle 1, and the other is located at the end of the second handle 2 connected to the first handle 1; or, one of the tapered limiting end 41 and the inner tapered cavity 42 is located at the connecting end of the rod head 3, and the other is located at the end of the second handle 2 connected to the rod head 3; the tapered limiting end 41 and the inner tapered cavity 42 are arranged coaxially, and the outer diameter tapering direction of the tapered limiting end 41 is opposite to the inner diameter tapering direction of the inner tapering cavity 42; when the exercise bar is in the fully extended state, the tapered limiting end 41 is located in the inner tapered cavity 42, and the tapered limiting end 41 and the inner tapered cavity 42 generate radial extrusion force under axial force, thereby wedging and self-locking.

[0032] The aforementioned limiting structure 4 is provided at the connection point between the first handle 1 and the second handle 2. (See below) Figure 2 The connecting end of the first handle 1 is the aforementioned conical limiting end 41. The end of the second handle 2 connected to the first handle 1 has the aforementioned inner conical cavity 42. The outer surface of the conical limiting end 41 is a conical transition surface. The cavity wall of the inner conical cavity 42 and the conical cavity wall, the conical transition surface and the conical cavity wall are matched, and the conical directions of the two are opposite.

[0033] See Figure 1 and Figure 2As shown, when the first handle 1 is extended outward from the second handle 2 to a predetermined position, the conical limiting end 41 and the inner conical cavity 42 can form a self-locking limiting fit. That is, as the extension length increases, the contact surface between the conical limiting end 41 and the inner and outer conical cavity 42 gradually increases, and a radial compressive force is generated under axial force, causing the first handle 1 to form a tight engagement with the second handle 2, thereby achieving stable positioning. Similarly, the second handle 2 and the clubhead 3 are also extended and locked in the same way. Furthermore, in the fully extended state, this structure can form a "wedge-like effect," that is, under the action of the inertial force generated by the swing, the first handle 1, the second handle 2, and the clubhead 3 will not loosen or retract, thereby improving the overall structural stability. In the retracted state, the user can apply a reverse axial thrust to disengage the conical limiting end 41 from the inner conical cavity 42, thereby releasing the lock and achieving smooth retraction.

[0034] This invention achieves telescopic positioning and anti-loosening functions without the need for additional complex locking mechanisms, thereby improving product reliability, facilitating storage and carrying when not in use, and reducing manufacturing costs.

[0035] As an optional implementation, see Figure 1 and Figure 2 The cone angle of the tapered transition surface is 2° to 6° to ensure both self-locking effect and smooth adjustment. The cone angle of the inner cone cavity 42 is equal to that of the tapered transition surface and they are coaxially and oppositely fitted together. This structure ensures that the tapered limiting end 41 can make tight contact with the cavity wall of the inner cone cavity 42. When the exercise bar is in a fully extended state, under axial force, the matching cone angle can effectively convert the axial force into a uniformly distributed radial compressive force, thereby achieving stable and reliable wedge-locking.

[0036] In existing technologies, golf practice clubs cannot accurately identify and count the swing motion, resulting in a lack of training data management. Current external counting devices are typically worn on the wrist or placed in a training bag. The motion data collected by their built-in accelerometers or gyroscopes is easily affected by everyday, non-training arm swings, making it difficult to accurately identify the complete cycle of the golf swing based on the kinematic characteristics of the club itself. If manual counting is used, missed or incorrect counts are highly likely during continuous or high-intensity training, leading to distorted training data and severely impacting the quantitative evaluation of training effectiveness. Furthermore, the external device and the practice club are structurally completely independent, lacking hardware integration and data linkage mechanisms, making it difficult for users to conveniently access training records directly linked to the club's usage status.

[0037] For the above issues, please refer to Figures 1-3As shown, the practice club of this embodiment further includes a counter 5. The counter 5 comprises a housing 51, and a battery 52, a gyroscope module 53, a main control unit and a wireless transmission module 54 that are electrically connected in sequence inside the housing 51. Wherein: the housing 51 is fixed inside the club head 3, the gyroscope module 53 is configured to collect swing motion data in real time, the main control unit identifies a complete swing motion according to the swing motion data and generates a swing count, and the wireless transmission module 54 is configured to transmit the swing count to an external mobile terminal.

[0038] Wherein, the gyroscope directly records the angular velocity of the club head 3 rotating around the spatial axis. The main control unit is a low-power microcontroller (MCU), in which a swing recognition algorithm program is solidified, and the algorithm program is configured to execute the sliding window analysis, threshold comparison and counting trigger logic.

[0039] The counting principle of this embodiment is: a complete golf swing presents a typical rise-zero crossing / low valley-peak-fall waveform on the angular velocity-time curve. Specifically, in the backswing phase: the angular velocity slowly increases to a positive peak; at the top transition: the angular velocity drops sharply and quickly falls back to a low valley value; in the downswing phase: the angular velocity rises sharply in the reverse direction (explosive force concentration zone); in the follow-through phase: the angular velocity rapidly attenuates to a static state.

[0040] After the main control unit (MCU) performs low-pass filtering and noise reduction on the raw data, it calculates the angular velocity vector modulus V(t), and matches it with the standard swing dynamic curve. A complete swing is decomposed by the algorithm into four characteristic phases: Backswing start: V(t) rises for the first time from the baseline, breaks through the threshold Th1, and the curve increases monotonically; Top transition: V(t) quickly falls back to a low valley value (<Th2), and the duration conforms to the human physiological limit (0.1 to 0.4s), reflecting the brief pause when the swing reaches the top; Downswing burst: V(t) rises sharply for the second time, with a peak significantly higher than that of the backswing, corresponding to the hitting moment of center of gravity transfer and torso release; Follow-through attenuation: after the peak, V(t) smoothly falls back to the static baseline within 1.5s, completing the action closed loop.

[0041] Counting trigger condition: the built-in algorithm of the main control unit (MCU) performs sliding window analysis on the continuous angular velocity data. Only when a complete waveform of direction reversal and amplitude threshold breakthrough is recognized, in other words, only when the gyroscope data strictly appears in the complete time sequence of rise, fall, sharp rise and slow fall, and the parameters of each phase fall within a reasonable physical range, the MCU determines it as a valid swing cycle, and the counter 5 increments by one.

[0042] To avoid miscounting caused by everyday actions such as walking, carrying a bag, half-swing practice, and collisions with the pole, the system has a built-in dynamic filtering mechanism. This mechanism includes: first, setting a time interval threshold, requiring an interval of ≥1.2 to 2.0 seconds between two consecutive valid counts; second, setting an amplitude window limit, requiring the peak angular velocity to be within a reasonable training range (e.g., 200 to 800° / s); and third, setting a spatial trajectory verification, requiring the direction of the principal vector of the angular velocity to conform to the rotational pattern of the Y-axis dominating the upper swing and the X and Z axes dominating the lower swing in space.

[0043] As an optional implementation, the main control unit is also configured to: calculate the swing speed and swing force for each swing based on the three-axis angular velocity data and / or acceleration data collected by the gyroscope module; identify the swing trajectory type for each swing based on the time series characteristics of the three-axis angular velocity data; and calculate the calorie consumption value for each swing and the cumulative training process based on the swing speed, swing force, and preset metabolic equivalent parameters.

[0044] Specifically, the swing speed is calculated as follows: the main control unit integrates the three-axis angular velocity data output by the gyroscope module 53 over time to obtain the change in angular displacement of the clubhead 3 during the swing. Combined with the effective lever arm length from the clubhead 3 to the grip 11 (i.e., the total length of the practice club in its fully extended state), the linear velocity of the clubhead 3 at the moment of impact is calculated using the conversion relationship between linear velocity and angular velocity, v=ω×r. Here, ω is the peak angular velocity during the downswing, and r is the effective lever arm length.

[0045] The swing force is calculated as follows: The main control unit calculates the kinetic energy value of the clubhead 3 at the moment of impact using the kinetic energy formula E = ½mv², based on the swing speed and the equivalent mass of the clubhead 3. This kinetic energy value is then used as a quantitative indicator of the swing force. Here, m is the equivalent mass of the clubhead 3 (including the equivalent mass of the weight head 32 and the weight whip 6), and v is the swing speed calculated above.

[0046] The swing trajectory type is identified as follows: the main control unit uses the time integral of the three-axis angular velocity data during each swing as a sequence of attitude angle changes. This sequence reflects the evolution of the clubhead's rotational attitude in three-dimensional space over time. The main control unit matches this sequence of attitude angle changes with a variety of pre-stored standard swing trajectory templates and outputs the swing trajectory type with the highest matching degree and the corresponding trajectory deviation parameters.

[0047] The standard swing trajectory template is pre-calibrated using standard swing movements by professional golf coaches and stored in the main control unit's memory. Swing trajectory types include, but are not limited to: backswing plane angle (i.e., the angle of inclination of the club body 31 relative to the horizontal plane during the backswing), downswing plane angle (i.e., the angle of inclination of the club body 31 relative to the horizontal plane during the downswing), and clubface opening / closing state (i.e., the degree to which the clubface is open or closed relative to the target line at the moment of impact).

[0048] The trajectory deviation parameters are the angular and / or temporal deviation values ​​between the actual swing trajectory and the standard swing trajectory template. The angular deviation value reflects the degree of deviation between the user's swing plane and the standard plane, while the temporal deviation value reflects the degree of deviation between the user's rhythm at each stage of the movement and the standard rhythm. Through these trajectory deviation parameters, users can intuitively understand the shortcomings of their swing movement and thus conduct targeted corrective training.

[0049] As an optional implementation: the main control unit calculates the calorie consumption value in the following way: the main control unit calculates the calorie consumption value of a single swing according to the following formula: Esingle= MET×W×Tswing / 3600; Wherein, Esingle is the calorie consumption value of a single swing, in kilocalories; MET is the metabolic equivalent coefficient corresponding to the swing action, which is retrieved from a preset metabolic equivalent mapping table based on the swing speed; W is the user's weight, in kilograms; Tswing is the effective duration of a single swing, in seconds; Tswing / 3600 is the swing duration in hours; the main control unit sums up the calorie consumption values ​​of all single swings during the training process to obtain the cumulative calorie consumption value.

[0050] The metabolic equivalent mapping table is a pre-stored lookup table within the main control unit, which maps swing speed ranges to corresponding MET values. For example, low-speed swings (swing speed below 30 m / s) correspond to MET values ​​of 3.5–4.0, medium-speed swings (swing speed 30–50 m / s) correspond to MET values ​​of 4.5–5.5, and high-speed swings (swing speed above 50 m / s) correspond to MET values ​​of 6.0–7.5. These MET values ​​are set with reference to research data on golf swing energy consumption in the field of sports medicine.

[0051] The main control unit sums up the calorie consumption values ​​of all single swings during the training process to obtain the cumulative calorie consumption value, and then sends it to an external mobile terminal for display via the wireless transmission module 54.

[0052] The counter 5 in this embodiment also includes a storage module, which is electrically connected to the main control unit. The storage module preferably uses a low-power non-volatile memory chip (such as Flash memory or EEPROM) to store training data records.

[0053] Training data records include at least two of the following: swing count, swing speed per swing, swing power per swing, swing trajectory type, calorie consumption, training start time, training end time, and training duration. The main control unit is configured to store training data records categorized by training date and / or training session. Specifically, when the main control unit detects that the gyroscope module 53 has not collected valid swing data within a preset time window (e.g., no valid swing signal for 5 consecutive minutes), it automatically determines that the current training session has ended and archives the training data records for that session. When a valid swing signal is detected again, the main control unit automatically starts recording a new training session.

[0054] The main control unit is also configured to generate training statistics reports based on the categorized and stored training data records. The training statistics reports include at least two of the following information: total number of swings per day, average swing speed, maximum swing speed, average swing power, trajectory deviation trend (i.e., the trend of trajectory deviation parameters in multiple consecutive training sessions), cumulative calorie consumption, and training frequency statistics (such as the number of training days per week, the average duration of each training session, etc.).

[0055] Training statistics reports can be sent to an external mobile terminal via the wireless transmission module 54 for visualization via a mini-program, or briefly displayed on the display screen of the training pole itself (if a display screen is provided). Through the training data recording and viewing functions, users can clearly understand their own training progress and changes in results, thereby more scientifically formulating and adjusting training plans to achieve better practice results.

[0056] In this embodiment, the wireless transmission module 54 preferably uses a Bluetooth Low Energy (BLE) module to establish a data communication connection with a mini-program running on an external mobile terminal. The mini-program is an application running on a mobile terminal (such as a smartphone or tablet).

[0057] As an alternative implementation, see [link to implementation details]. Figure 5 As shown, the club head 3 is provided with a mounting groove 301, the opening of which extends to the outer surface of the club head 3; see also Figure 4 The housing 51 is provided with a cover 55. When the housing 51 is assembled in the mounting groove 301, see [reference needed]. Figure 2 and Figure 4 , Figure 5 The cover 55 is fastened to the groove of the mounting groove 301 and the mounting groove 301 is sealed.

[0058] Mounting slot 301 provides an assembly channel for counter 5, allowing the main body of counter 5 to be quickly and accurately inserted into or removed from the rod head 3. Simultaneously, the cover 55 on the housing 51 tightly engages with the groove of mounting slot 301, effectively protecting counter 5 and its internal components from external intrusion. This also ensures the outer surface of the rod head 3 remains flat and integrated, enhancing the overall aesthetics and user experience. This structure achieves stable installation of the counter 5 main body inside the rod head 3, simplifying the user's procedures for battery 52 replacement or equipment maintenance, and improving product maintainability.

[0059] As an alternative implementation, see [link to implementation details]. Figure 1 and Figure 2 As shown, the first handle 1 includes a gripping part 11, which is fixedly connected to a conical limiting end 41. The outer diameter of the conical limiting end 41 gradually increases in the direction away from the gripping part 11, and the outer diameter of the gripping part 11 is smaller than the outer diameter of the wide end of the conical limiting end 41.

[0060] See Figure 1 As shown, friction protrusions can be provided on the grip part 11 to increase the friction between the user's hand and the grip part 11, prevent the hand from slipping, and facilitate force application practice.

[0061] The grip portion 11 adopts an ergonomic structure, such as having an appropriate diameter, shape, and surface texture, to provide a comfortable and non-slip grip experience. Its material can be rubber, silicone, or other composite materials with a good coefficient of friction and cushioning properties to enhance grip stability and comfort. The grip portion 11 is fixedly connected to the tapered limiting end 41, for example, through bonding, threaded connection, interference fit, welding, or integral molding.

[0062] See Figure 1 and Figure 2 As shown, the narrower end of the tapered limiting end 41 is closer to the grip portion 11, while the wider end is farther away from the grip portion 11. The outer diameter of the grip portion 11 is smaller than the outer diameter of the wider end of the tapered limiting end 41. This dimensional relationship ensures that the diameter of the grip area is moderate, facilitating a comfortable grip for the user, while avoiding interference with grip comfort from the wider portion of the tapered limiting end 41. A reasonable transition area is formed between the grip portion 11 and the tapered limiting end 41, ensuring grip comfort while providing sufficient structural space and strength for the self-locking function of the tapered limiting end 41.

[0063] As an alternative implementation, see [link to implementation details]. Figure 1 and Figure 2 As shown, the first handle 1 also includes a stop end 12, which is fixed to one end of the grip portion 11 away from the conical limiting end 41. The outer diameter of the stop end 12 is larger than the outer diameter of the grip portion 11.

[0064] See Figure 1 and Figure 2 The stop end 12 provides a clear physical boundary for the hand when the user grips the practice club and performs a swing. When the user's hand may slip outwards due to inertia or improper force during the swing, the increased outer diameter of the stop end 12 effectively hinders further hand movement, thus preventing slippage. This improves the user's grip stability during the swing, avoids accidents or movement distortions caused by hand slippage, and ultimately improves practice efficiency and the overall practice experience.

[0065] As an alternative implementation, see [link to implementation details]. Figure 1 , Figure 2 and Figure 5 The rod head 3 includes a rod body 31 and a counterweight head 32. The counterweight head 32 is fixed to one end of the rod body 31 away from the second handle 2. The outer contour of the counterweight head 32 is arc-shaped, and a counterweight whip 6 is fixedly connected to the counterweight head 32.

[0066] See Figure 1 , Figure 2 and Figure 5 The outer contour of the weight head 32 is arc-shaped. The arc-shaped outer contour helps to optimize the flow characteristics of the clubhead 3 in the air, reduce air resistance during the swing, and make the swing process smoother.

[0067] The counterweight whip 6 is a flexible component with a certain mass, designed to provide additional dynamic feedback during the swing. As the swing accelerates, the counterweight whip 6 lags behind due to inertia and then rapidly whips out at a specific point in the swing due to centrifugal force, creating a "whipping" effect. This effect helps the player perceive the rhythm of the swing, the point of power release, and the speed of the clubhead 3, thereby effectively correcting the swing motion and improving swing efficiency and power.

[0068] As an alternative implementation, see [link to implementation details]. Figure 1 , Figure 2 and Figure 5 The outer edge of the counterweight head 32 is provided with mounting holes 7. The mounting holes 7 are located on the side of the counterweight head 32 away from the rod body 31. The counterweight whip 6 is tied and fixed at the mounting holes 7. The number of mounting holes 7 is one or more. When the number of mounting holes 7 is two or more, all mounting holes 7 are arranged at intervals along the outer arc contour of the rod head 3.

[0069] By fixing the counterweight whip 6 to the mounting holes 7 at different positions, users can obtain different counterweight modes and achieve various training effects by changing the position of the counterweight whip 6.

[0070] According to the parallel axis theorem, changing the axial position of the weight module directly adjusts the overall rotational inertia. Moving the weight forward (closer to the clubhead 3) increases swing resistance, suitable for strength training and lower body stability training; moving the weight backward (closer to the second handle 2) reduces rotational inertia, suitable for swing rhythm calibration and neuromuscular coordination training. Users can flexibly switch weight modes according to training stages. Swing data recorded by counter 5 is linked to the weight configuration tag, facilitating later comparative analysis of differentiated training effects.

[0071] As an alternative implementation, see [link to implementation details]. Figure 1 and Figure 2 As shown, the first handle 1, the second handle 2, and the rod head 3 are sequentially telescopically connected along the same central axis; the first handle 1, the second handle 2, and the rod head 3 are all flat structures, and their flat main surfaces are parallel to each other and located in the same reference plane. The reference plane is a design alignment reference plane parallel to the flat main surfaces of each component. Figure 2 The cut lines shown are only for illustrating internal assembly relationships.

[0072] The aforementioned structure, with its flattened shape for the first handle 1, second handle 2, and clubhead 3, effectively solves the problem of relative rotation of components that may exist in traditional circular cross-section telescopic clubs. The flattened structure provides anti-rotation constraints when nested, allowing the practice club to maintain a stable posture during the swing, avoiding poor feel or inaccurate swing trajectory caused by component rotation. Simultaneously, the practice club forms a flat, integrated shape in its retracted state, greatly improving the product's portability and storage efficiency. Users can more easily place it in a golf bag or carry it with them without taking up too much space. Furthermore, the flattened grip 11 may also provide a more ergonomic grip experience, further enhancing user comfort.

[0073] The specific features, structures, or characteristics described in this specification may be combined in any suitable manner in one or more embodiments or examples.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A retractable golf practice club, characterized in that, Includes a first handle, a second handle, and a club head, wherein: The first handle, the second handle, and the rod head are nested in sequence. The first handle and the second handle, and the second handle and the rod head, can slide relative to each other under the action of external force, so that the exercise bar is in a fully extended state or a retracted state. Limiting structures are provided between the first handle and the second handle, and between the second handle and the club head. When the practice bar is in a fully extended state, all the limiting structures are used to achieve axial self-locking between the first handle, the second handle and the club head.

2. The retractable golf practice club according to claim 1, characterized in that, The limiting structure includes a tapered limiting end and an inner tapered cavity, wherein: Of the conical limiting end and the inner conical cavity, one is disposed at the connecting end of the first handle, and the other is disposed at the end of the second handle connected to the first handle. Alternatively, one of the tapered limiting end and the inner tapered cavity may be disposed at the connecting end of the rod head, and the other may be disposed at the end where the second handle is connected to the rod head. The conical limiting end and the inner conical cavity are arranged coaxially, and the outer diameter tapering direction of the conical limiting end is opposite to the inner diameter tapering direction of the inner conical cavity. When the exercise bar is in its fully extended state, the conical limiting end is located in the inner conical cavity. The conical limiting end and the inner conical cavity generate radial extrusion force under axial force, thereby wedging and self-locking.

3. The retractable golf practice club according to claim 2, characterized in that, The outer surface of the conical limiting end is a conical transition surface, and the cone angle of the conical transition surface is 2° to 6°; The cone angle of the inner conical cavity wall is equal to the cone angle of the conical transition surface.

4. The retractable golf practice club according to claim 1, characterized in that, The practice stick also includes a counter, which comprises a housing, a battery, a gyroscope module, a main control unit, and a wireless transmission module connected in sequence within the housing, wherein: The housing is fixed inside the clubhead. The gyroscope module is configured to collect swing motion data in real time. The main control unit identifies the complete swing action based on the swing motion data and generates a swing count. The wireless transmission module is used to send the swing count to an external mobile terminal.

5. The retractable golf practice club according to claim 4, characterized in that, The rod head is provided with a mounting groove, the opening of which extends to the outer surface of the rod head; The housing is provided with a cover. When the housing is assembled in the mounting groove, the cover is fastened to the opening of the mounting groove and the mounting groove is closed.

6. The retractable golf practice club according to claim 2, characterized in that, The first handle includes a grip portion, which is fixedly connected to the tapered limiting end. The outer diameter of the tapered limiting end gradually increases in the direction away from the grip portion, and the outer diameter of the grip portion is smaller than the outer diameter of the wide end of the tapered limiting end. The first handle also includes a stop end, which is fixed to one end of the grip portion away from the tapered limiting end, and the outer diameter of the stop end is larger than the outer diameter of the grip portion.

7. The retractable golf practice club according to claim 1, characterized in that, The rod head includes a rod body and a counterweight head. The counterweight head is fixed to the end of the rod body away from the second handle. The outer contour of the counterweight head is arc-shaped. A counterweight whip is fixedly connected to the counterweight head. The outer edge of the counterweight head is provided with a mounting hole, which is located on the side of the counterweight head away from the rod body, and the counterweight whip is bound and fixed at the mounting hole. The number of mounting holes is one or more. When the number of mounting holes is two or more, all the mounting holes are arranged at intervals along the outer arc contour of the rod head.

8. The retractable golf practice club according to claim 1, characterized in that, The first handle, the second handle, and the rod head are sequentially telescopically connected along the same central axis. The first handle, the second handle, and the rod head are all flat structures, and their flat main surfaces are parallel to each other and located in the same reference plane.

9. The retractable golf practice club according to claim 4, characterized in that, The main control unit is also configured to: Based on the triaxial angular velocity data and / or acceleration data collected by the gyroscope module, calculate the swing speed and swing force for each swing; Based on the time series characteristics of the triaxial angular velocity data, identify the swing trajectory type for each swing; Based on the swing speed, the swing force, and the preset metabolic equivalent parameters, calculate the calorie consumption for each swing and the cumulative training process; The main control unit calculates calorie consumption values ​​in the following ways: The main control unit calculates the calorie consumption of a single swing according to the following formula: Esingle= MET×W×Tswing / 3600; Where, Esingle is the calorie consumption value of a single swing, in kilocalories; MET is the metabolic equivalent coefficient corresponding to the swing action, which is retrieved from a preset metabolic equivalent mapping table based on the swing speed; W is the user's weight, in kilograms; Tswing is the effective duration of a single swing, in seconds; The main control unit sums up the calorie consumption values ​​of all single swings during the training process to obtain the cumulative calorie consumption value.

10. The retractable golf practice club according to claim 4 or 9, characterized in that, The counter also includes a storage module, which is electrically connected to the main control unit. The storage module is configured to store training data records, which include at least two of the following information: swing count, swing speed for each swing, swing power for each swing, swing trajectory type, calorie consumption, training start time, training end time, and training duration. The main control unit is configured to classify and store the training data records according to training date and / or training session, and generate training statistics reports; The training statistics report includes at least two of the following information: total number of swings per day, average swing speed, maximum swing speed, average swing power, trajectory deviation trend, cumulative calorie consumption, and training frequency statistics.

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