Multifunctional upper limb resistance training device

Abstract

The application discloses a multifunctional upper limb resistance training device, which comprises two holding handles, the holding handle is composed of two matching parts and a middle part, the radial section of the middle part is arranged in an arc shape, the matching part is provided with a movable slot, each movable slot is provided with an elastic rope group between the corresponding movable slots, the middle part is provided with a reset structure for driving the elastic rope to retract and reset into the movable slot when the elastic rope group is not subjected to external stress, the matching part and the adjacent reset structure are provided with a first adjusting structure for linkage with the reset structure to adjust the stretching damping strength of the elastic rope group, and the holding handle is provided with a second adjusting structure for adjusting the weight of the holding handle. The application solves the problem that there is no upper limb resistance training device which can adapt to the training needs of pregnant women in different pregnancy stages and flexibly adjust the training strength.

Description

Technical Field

[0001] This invention relates to the field of training equipment for pregnant women, specifically a multifunctional upper limb resistance training device. Background Technology

[0002] In the field of prenatal care and rehabilitation, upper limb resistance training, as a gentle form of exercise, can effectively promote blood circulation in the upper limbs of pregnant women, alleviate common pregnancy symptoms such as limb edema and muscle soreness, and help strengthen upper limb muscles to cope with the burden on the limbs caused by increased weight during pregnancy. This is of great significance for ensuring maternal health and a smooth delivery. However, most existing upper limb resistance trainers on the market are of general design, primarily developed for the training needs of ordinary healthy adults. They do not fully consider the physiological characteristics and stage-specific physical changes of pregnant women, resulting in many unavoidable shortcomings in practical application and failing to meet the targeted needs of prenatal training. Specifically, the core deficiencies of existing upper limb resistance trainers are concentrated in the following aspects: Firstly, the functional design is too simplistic and lacks consideration for the physiological differences experienced by pregnant women at different stages of pregnancy. In early pregnancy, women often experience fatigue, nausea, and other pregnancy reactions, resulting in low training tolerance. In mid-pregnancy, as the abdomen grows larger, limb mobility becomes limited, increasing the need for ease of operation of the training device. In late pregnancy, the body's workload reaches its peak, joint laxity increases, and training intensity needs to be strictly controlled. Currently, existing training devices have fixed structures and training parameters, making it impossible to adjust and adapt them to the physical tolerance and activity levels of pregnant women at different stages of pregnancy. This easily leads to problems such as excessive training intensity causing injury or insufficient intensity failing to achieve the desired health benefits.

[0003] Secondly, the lack of a tension damping intensity adjustment mechanism or the cumbersome adjustment method makes it difficult to match the personalized training intensity needs of pregnant women. The resistance intensity of existing training devices is mostly a fixed value preset by the factory, which cannot be flexibly adjusted according to the strength foundation and training progress of pregnant women. For pregnant women in early pregnancy with weak strength, the fixed intensity may exceed their tolerance range and cause the risk of muscle strain. For pregnant women in mid-pregnancy who need to gradually increase the training intensity, it is impossible to achieve the training goal of gradual progress.

[0004] Third, the weight of the grip components is not adjustable, resulting in extremely poor adaptability. Currently, there are significant differences in hand strength and weight-bearing tolerance among pregnant women at different stages of pregnancy. In addition, some pregnant women may experience decreased hand dexterity due to pregnancy edema. The fixed weight grips of existing training devices cannot meet these individual needs. Overly heavy grips will increase the burden on the hands, while overly light grips will not achieve the effect of assisting training, seriously affecting training comfort and safety.

[0005] Fourth, most training devices lack an automatic retraction and reset mechanism for the elastic cords. After use, the elastic cords are prone to loosening and tangling, which not only takes up storage space but also increases the difficulty for pregnant women with limited mobility to organize the equipment. In fact, the tangled cords may even cause tripping hazards.

[0006] In summary, there is currently no upper limb resistance training device that can accurately adapt to the physiological characteristics of pregnant women at different stages of pregnancy, flexibly adjust the training intensity, have excellent grip fit, and be easy to use. This makes it difficult to meet the urgent needs of the prenatal care field for safe, adaptable, and personalized upper limb training equipment. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a multifunctional upper limb resistance training device, which solves the problem of the lack of an upper limb resistance training device that can flexibly adjust the training intensity and meet the upper limb training needs of pregnant women at different stages of pregnancy.

[0008] To achieve the above objectives, the present invention provides a multifunctional upper limb resistance training device, comprising two grips, each grip consisting of two mating parts and a central part, with the two mating parts arranged parallel to each other. The central part has an arc-shaped radial cross-section. Each mating part has a movable groove that extends to the central part. The two movable grooves of one grip correspond one-to-one with the two movable grooves of the other grip and are arranged opposite each other. Each movable groove is connected to a set of elastic ropes. The central part is provided with a reset structure at the position of each two adjacent movable grooves, for driving the elastic ropes to retract and reset into the movable grooves when the elastic ropes are not subjected to external stress. A first adjustment structure is provided between the mating parts and the adjacent reset structure for cooperating with the reset structure to adjust the tensile damping strength of the elastic ropes. The grips are provided with a second adjustment structure for adjusting the weight of the grips.

[0009] The advantages of adopting the above technical solution are as follows: The parallel arrangement of the two grip handles and the combined design of the central arc structure precisely conform to the contours of a pregnant woman's hand, reducing pressure and discomfort from prolonged gripping and significantly improving grip adaptability. The movable slot not only provides dedicated storage space for the elastic rope set but also prevents it from being exposed and causing tangling or snagging, thus adapting to usage scenarios where movement is difficult during pregnancy. The aforementioned reset structure automatically retracts the elastic rope set into the movable slot when not under external stress, eliminating the tedious manual adjustment steps for pregnant women and further improving ease of operation. The first adjustment structure works in conjunction with the reset structure to flexibly adjust the tensile damping strength of the elastic rope set according to the strength tolerance of pregnant women at different stages of pregnancy, avoiding the risk of excessive training intensity in early pregnancy while also meeting the need for moderately increased training intensity in mid-pregnancy. The aforementioned second adjustment structure allows for adjustment of the grip handle weight as needed, adapting to pregnant women with different hand weight-bearing capacities, effectively solving the problem of existing upper limb trainers having limited functionality and failing to meet the needs of pregnant women at different stages of pregnancy. Through the coordinated operation of the above structures, the safety and comfort of training are ensured, while the practicality and versatility of the training device are improved, fully meeting the personalized needs of upper limb resistance training during pregnancy.

[0010] The present invention further comprises: the elastic rope assembly including a first elastic band and a second elastic band, each of the first elastic band and the second elastic band being detachably coupled to two grip handles; the first elastic band being flat; and the second elastic band being woven from at least two elastic ropes as warp and weft weaving units using an interlacing weaving process to form a preset grid pattern; the first elastic band being made of thermoplastic rubber; and the elastic ropes in the second elastic band being made of high-elastic spandex.

[0011] The advantages of adopting the above technical solution are as follows: The elastic rope set in the above technology uses a combination design of a first elastic band and a second elastic band, which realizes multi-level adaptation of training intensity. The flat structure of the first elastic band can increase the contact area with the hand or contact parts, reduce local pressure concentration, and combined with the excellent toughness and slight elastic deformation performance of thermoplastic rubber material, it can be adapted to the basic resistance training scenario of pregnant women, avoiding excessive stretching and burden on the body; while the second elastic band is formed by the interlacing of warp and weft elastic ropes to form a grid pattern. This structure can make the force more even during stretching, combined with... The high tensile elasticity of the high-elastic spandex material can meet the intensity requirements of advanced resistance training for pregnant women. The detachable and interchangeable design of both materials allows pregnant women to flexibly switch between them according to their training stage and physical condition without having to replace the entire training device, thus reducing usage costs. At the same time, both thermoplastic rubber and high-elastic spandex are mild and safe materials, with no irritating odor and a soft touch, meeting the safety standards for use during pregnancy. This effectively avoids the problem of insufficient adaptability caused by the limited function of a single elastic band, enriching the functionality of the training device and further improving its adaptability and overall practicality for pregnant women at different stages of pregnancy.

[0012] The invention further comprises: the reset structure including a flat spiral spring, the flat spiral spring being formed by winding a flat elastic steel sheet along a central axis to form a spiral structure; the flat spiral spring having an inner ring positioning part and an outer ring free part; a positioning shaft is provided at the middle corresponding to the positions of the two flat spiral springs; the positioning shaft is inserted into the shaft hole of the inner ring positioning part; the inner ring positioning part is movably mounted on the positioning shaft; the outer ring free part extends towards the opening of the movable groove to have a connecting end; a slot is provided on the outer wall of the connecting end for the end of the first elastic band to be inserted; a positioning hole is provided through the connecting end; the positioning hole is provided through the slot and a positioning pin is threadedly connected in the positioning hole; both ends of the first elastic band have mating holes; when the end of the first elastic band is inserted into the slot, the mating hole and the positioning hole are coaxially aligned and the positioning pin passes through the mating hole.

[0013] The advantages of adopting the above technical solution are as follows: The reset structure in the above technology adopts a flat spiral spring design, which is a spiral structure formed by a flat elastic steel sheet wound along the central axis. It has a stable and durable elastic restoring force, which can ensure that the elastic rope group can reliably retract and reset when there is no external stress, avoiding failures such as incomplete retraction or jamming; The insertion and matching of the positioning shaft and the inner ring positioning part of the flat spiral spring realizes the precise positioning and installation of the spring, ensures the coaxiality of the spring winding and unfolding process, reduces uneven wear and loss, and extends service life; The inner ring positioning part is movably set on the positioning shaft, which can flexibly adapt to the tension of the elastic rope group. The extension and return stroke requirements ensure the stable transmission of elastic restoring force. The connecting end of the outer ring's free extension is inserted into the end of the first elastic band via a slot, and fixed by a threaded connection of the positioning hole and positioning pin. This achieves a firm connection between the first elastic band and the spring, while also ensuring easy disassembly for later maintenance and replacement. The coaxial alignment design of the mounting hole and positioning hole prevents misalignment during installation, ensuring uniform force on the first elastic band and preventing the risk of breakage due to localized stress concentration. Through the design of the above overall structure, the stability and reliability of the return function are effectively improved, providing strong protection for safe prenatal training.

[0014] The present invention further comprises: the first adjustment structure including a damping pad, the damping pad being movably disposed in the movable groove and positioned near the opening of the movable groove; the grip having an adjustment hole corresponding to the position of the movable groove; an adjustment shaft being threadedly connected to the adjustment hole; the beginning end of the adjustment shaft being inserted into the movable groove and rotatably connected to the top wall of the damping pad; the end of the adjustment shaft extending out of the grip to form a rotating handle for external users to rotate; the bottom wall of the damping pad being a contact surface for contacting the top wall of the first elastic band or the top wall of the free part of the outer ring; and the damping pad being made of nylon or nitrile rubber.

[0015] The advantages of adopting the above technical solution are as follows: The first adjustment structure in the above technology, through the coordinated cooperation of the damping pad and the adjustment shaft, constructs a simple and efficient damping adjustment mechanism. The user only needs to rotate the handle at the end of the adjustment shaft to drive the damping pad to move within the movable groove via threaded transmission, thereby adjusting the contact pressure between the damping pad and the free part of the outer ring of the first elastic band or flat spiral spring, achieving precise adjustment of the tensile damping strength. The operation is convenient and requires no additional tools, making it suitable for pregnant women. The damping pad is positioned near the opening of the movable groove, which not only accurately acts on the force-bearing part to generate stable damping but also does not interfere with the stretching and retraction stroke of the elastic rope assembly, ensuring the training process is safe. The adjustment mechanism ensures smooth operation; the threaded connection between the adjustment hole and the adjustment shaft ensures the damping pad is fixed in position after adjustment, preventing damping intensity shift due to vibration during training and improving adjustment stability; the damping pad is made of nylon or nitrile rubber, both of which have excellent wear resistance and friction stability, maintaining a stable damping effect during long-term friction contact, preventing damping attenuation, and also have a certain degree of elasticity, reducing wear on contact parts and extending the service life of the parts; this structure effectively solves the problem of difficult adjustment of stretching damping in existing trainers, and can accurately adapt to the training intensity needs of pregnant women at different stages of pregnancy, improving the personalized adaptability of the trainer.

[0016] The present invention further comprises: a plurality of damping protrusions evenly distributed on the contact surface for abutting against the top wall of the first elastic band or the top wall of the free portion of the outer ring, the damping protrusions being made of elastic rubber material.

[0017] The advantages of adopting the above technical solution are: the damping protrusions evenly distributed on the damping pad are made of elastic rubber material, which can significantly enhance the contact friction with the free part of the outer ring of the first elastic band or flat spiral spring, improve the sensitivity and accuracy of damping adjustment, and make the change of damping intensity more intuitive and controllable, making it easier for pregnant women to fine-tune the training intensity according to their own feelings; at the same time, the buffering effect of the elastic material can reduce the hard friction between the damping protrusions and the contact parts, reduce the degree of wear, and extend the service life of both.

[0018] The present invention further includes: a mating pad connected to the inner wall of the movable groove, the mating pad being disposed opposite to the damping pad, the mating pad being made of nylon or nitrile rubber, and the top wall surface of the mating pad being a mating surface for contacting the bottom wall of the first elastic band or the bottom wall of the outer ring free part.

[0019] The advantages of adopting the above technical solution are: the mating pad and damping pad arranged opposite each other on the inner wall of the above-mentioned movable groove form a two-way clamping structure for the free part of the outer ring of the first elastic band or flat spiral spring, which can greatly enhance the stability of the contact part, avoid damping fluctuations caused by the swaying of the elastic rope group during training, and improve the uniformity of the damping effect; the mating pad is made of nylon or nitrile rubber that is compatible with the material of the damping pad. Both materials have excellent wear resistance and deformation resistance, which can maintain structural stability during long-term clamping friction and avoid loosening due to deformation. At the same time, the friction coefficients of the two materials are highly matched, which can ensure the consistency and controllability of the damping effect; the above structure takes into account both stability and adjustment precision, further optimizes the user experience of the trainer, and enhances its adaptability to training scenarios during pregnancy.

[0020] The invention further comprises: the first elastic band being divided into a left band body and a right band body, the left band body and the right band body being respectively connected to two grips; the left band body being connected to the connecting end of a corresponding flat spiral spring on an adjacent grip; the right band body being connected to the connecting end of a corresponding flat spiral spring on an adjacent grip; a buckle being provided on the left band body, the buckle being bent; a locking block being provided on the right band body, the locking block having a through notch, the notch being engaged with the locking block; the buckle being composed of a horizontal part, a vertical part and a bent part connected in sequence; the horizontal part being connected to the left band body; the vertical part being perpendicular to the horizontal part; the bent part being parallel to the horizontal part; when the buckle is engaged with the notch, the vertical part is inserted into the notch and the bottom wall of the bent part abuts against the top wall of the locking block.

[0021] The advantages of adopting the above technical solution are as follows: The design of the first elastic band being divided into a left band and a right band allows each to precisely engage with its corresponding flat spiral spring connection end, ensuring the synchronicity of both ends during the stretching and retraction of the elastic rope assembly. This avoids skewing and jamming caused by uneven force at both ends, improving the smoothness of the training process. The notched locking structure of the buckle and locking block enables quick disassembly and assembly of the left and right bands without the need for additional tools, making it suitable for pregnant women with limited mobility and operational abilities. It also facilitates the storage and carrying of the training device, reducing storage space requirements. The integrated structure, consisting of a horizontal section, a vertical section, and a bending section connected sequentially, possesses excellent structural stability and load-bearing capacity. After the vertical section is inserted into the notch, the abutment between the bottom wall of the bending section and the top wall of the locking block forms a bidirectional limiting mechanism, effectively preventing the buckle from falling off during training and improving connection reliability and safety. This connection structure not only ensures structural stability during the stretching process of the first elastic band, guaranteeing training effectiveness, but also enhances the flexibility of the trainer through its convenient assembly and disassembly design. Single or multiple elastic bands can be selected for use according to training needs, further enriching training scenarios and adapting to the diverse training needs of pregnant women at different stages of pregnancy.

[0022] The present invention further comprises: a plurality of fixed shafts are evenly distributed circumferentially on the outer peripheral walls of the two mating parts of the grip; the second elastic band has a radial cross-section in the shape of a rhombus and force-bearing parts are connected to both ends of the rhombus; the second elastic band is located between the two grips; a plurality of connecting strips are connected to the two force-bearing parts; the plurality of connecting strips correspond one-to-one with the plurality of fixed shafts; each connecting strip has a through hole for the corresponding fixed shaft to pass through; each fixed shaft is threaded with a clamping nut for pressing against the outer surface of the connecting strip; the connecting strips and the force-bearing parts are integrally formed with the second elastic band.

[0023] The advantages of adopting the above technical solution are: the diamond-shaped radial cross-section of the second elastic band significantly improves the uniformity of force during stretching, making the elastic recovery force more stable and avoiding damage to the elastic band caused by local stress concentration. Simultaneously, the diamond structure possesses excellent elastic deformation capability, adapting to a wider range of stretching strokes to meet training needs of varying intensities. The force-bearing part and connecting strip are integrally manufactured with the second elastic band, effectively improving the overall structural strength and connection reliability, preventing breakage of the connection due to tension during training, and extending service life. Furthermore, the connecting strip precisely engages with the fixed shaft of the grip handle through perforations, ensuring proper compression. The tightening of the nuts securely connects the second elastic band to the handle, preventing slippage or detachment during training. The one-to-one correspondence between the connecting strips and the fixed shaft ensures even force distribution across all connection points, further enhancing structural stability. The detachable connection allows for easy replacement of the second elastic band with different elastic strengths to suit varying strength tolerances during pregnancy, eliminating the need to replace the entire trainer and reducing operating costs. This overall structural design balances stability, durability, and flexibility, effectively expanding the trainer's functionality and enhancing its adaptability to training scenarios during pregnancy.

[0024] The present invention further comprises: a plurality of counterweight holes are provided on the outer wall of the grip, the plurality of counterweight holes are evenly distributed along the opening direction of the grip, the second adjustment structure includes a plurality of counterweight columns, the plurality of counterweight columns correspond one-to-one with the plurality of counterweight holes, and each of the counterweight columns is threadedly connected to the corresponding counterweight hole to realize the detachable connection between the counterweight column and the counterweight hole, and the top wall of the counterweight column is provided with a rotating bar for external users to squeeze to drive the counterweight column to rotate.

[0025] The advantages of adopting the above technical solution are: the numerous counterweight holes evenly distributed on the outer wall of the handle ensure a uniform weight distribution when adding or removing counterweights, preventing imbalance due to weight shift and improving comfort and safety; the detachable design with threaded connections between the counterweights and the counterweight holes allows pregnant women to flexibly add or remove the number of counterweights according to their hand strength and training needs, precisely adjusting the handle weight. This is suitable for light-load training when hand strength is weak in early pregnancy, and also meets the training needs for moderately increased load in mid-pregnancy; the top of the counterweight... The rotating bar structure on the wall provides users with a convenient grip and force application point. The counterweight column can be easily rotated to complete the installation and removal without additional tools, which is suitable for pregnant women with limited mobility and improves the ease of operation. The above-mentioned adjustment structure does not require changing the main structure of the grip handle, does not affect the grip feel and the normal operation of other components, and is simple to implement and low in cost. It effectively solves the problem of the inability to adjust the weight of the grip handle in existing trainers, further enhancing the trainer's adaptability to pregnant women at different stages of pregnancy and with different hand conditions, and improving the overall practicality and versatility.

[0026] The present invention further includes: a grip pad is provided on the inner wall of the grip along the central arc direction, the grip pad is located near the center and has a placement groove for the fingers of external users, and the grip pad is made of elastic material.

[0027] The advantages of adopting the above technical solution are as follows: the grip pad, which is set along the central arc direction on the inner wall of the grip handle, can accurately conform to the contour of the pregnant woman's hand, making the fingers fit more closely and stably, and greatly improving the comfort and fit when holding the grip; the grip pad made of elastic material has excellent cushioning performance, which can effectively relieve the pressure on the hand during training, reduce the fatigue and pressure caused by prolonged holding, and adapt to the physiological characteristics of hand edema during pregnancy; through the above structural optimization of the grip experience, the problems of uncomfortable grip and poor adaptability of existing training devices are effectively solved, meeting the comfort needs of pregnant women during long-term training, and further improving the user experience and safety and reliability of the training device. Attached Figure Description

[0028] Figure 1 A three-dimensional view of the first elastic band used in this invention; Figure 2 for Figure 1 A partial 3D view; Figure 3 for Figure 2 A magnified view of part A in the middle; Figure 4 This is a simplified three-dimensional view of the card block and the left belt body in the separated state in this invention; Figure 5 A three-dimensional view of the second elastic band used in this invention; Figure 6 for Figure 5 Side sectional view; Figure 7 This is a simplified schematic diagram of the contact surface of the damping pad in this invention. Detailed Implementation

[0029] This invention provides a multifunctional upper limb resistance training device, comprising two grips 1, each grip 1 consisting of two mating parts 11 and a central part 12, with the two mating parts 11 arranged parallel to each other. The central part 12 has an arc-shaped radial cross-section. Each mating part 11 has a movable groove 111 that connects to the central part 12. The two movable grooves 111 of one grip 1 correspond one-to-one with the two movable grooves 111 of the other grip 1 and are arranged opposite each other. Each movable groove 111 is connected to a set of elastic ropes. The central part 12 is provided with a mechanism at each of two adjacent movable grooves 111 for retracting the elastic ropes back to the movable grooves 11 when the elastic ropes are not subjected to external stress. In the reset structure of 1, a first adjustment structure is provided between the mating part 11 and the adjacent reset structure for linkage with the reset structure to adjust the tensile damping strength of the elastic rope assembly. A second adjustment structure is provided on the grip handle 1 for adjusting the weight of the grip handle 1. The elastic rope assembly includes a first elastic band 2 and a second elastic band 3. Either the first elastic band 2 or the second elastic band 3 is detachably coupled to the two grip handles 1 respectively. The first elastic band 2 is flat. The second elastic band 3 is woven from at least two elastic ropes as warp and weft weaving units using an interlacing weaving process to form a preset mesh pattern. The first elastic band 2 is made of thermoplastic rubber, and the elastic ropes in the second elastic band 3 are made of high-elastic spandex. The reset structure includes a flat spiral spring 4, which is formed by winding a flat elastic steel sheet along a central axis to form a spiral structure. The flat spiral spring 4 has an inner ring positioning part 41 and an outer ring free part 42. The middle part 12 is provided with a positioning shaft 121 corresponding to the positions of the two flat spiral springs 4. The positioning shaft 121 is inserted into the shaft hole of the inner ring positioning part 41 and is movably mounted on the positioning shaft 121. The outer ring free part 42 extends towards the opening of the movable groove 111 and has a connecting end 421. The outer wall of the connecting end 421 has a slot 422 for inserting the end of the first elastic band 2. The connecting end 421 has a through positioning hole 423 that passes through the slot 422. A positioning pin 424 is threaded into the positioning hole 423. Both ends of the first elastic band 2 have mating holes 21. When the end of the first elastic band 2 is inserted into the slot 422, the mating hole 21 is coaxially aligned with the positioning hole 423, and the positioning pin 424 passes through the mating hole 21. The first adjustment structure includes a damping pad 5, which is movably disposed in the movable groove 111 and positioned near the opening of the movable groove 111. The grip 1 has an adjustment hole 13 corresponding to the position of the movable groove 111. An adjustment shaft 51 is threaded into the adjustment hole 13. The beginning end of the adjustment shaft 51 is inserted into the movable groove 111 and rotatably connected to the top wall of the damping pad 5. The end of the adjustment shaft 51 extends out of the grip 1 handle, forming a rotating handle 52 for external users to rotate.The bottom wall of the damping pad 5 is a contact surface for contacting the top wall of the first elastic band 2 or the top wall of the outer ring free portion 42. The damping pad 5 is made of nylon or nitrile rubber. A plurality of damping protrusions 53 are evenly distributed on the contact surface for abutting against the top wall of the first elastic band 2 or the top wall of the outer ring free portion 42. The damping protrusions 53 are made of elastic rubber. A mating pad 54 is connected to the inner wall of the movable groove 111. The mating pad 54 is positioned opposite to the damping pad 5. The mating pad 54 is made of nylon or nitrile rubber. The top wall of the mating pad 54 is a mating surface for contacting the bottom wall of the first elastic band 2 or the bottom wall of the outer ring free portion 42. The first elastic band 2 is divided into a left band body 22 and a right band body 23. The left strap 22 and right strap 23 are respectively connected to two grip handles 1. The left strap 22 is connected to the connecting end 421 of the corresponding flat spiral spring 4 on the adjacent grip handle 1, and the right strap 23 is connected to the connecting end 421 of the corresponding flat spiral spring 4 on the adjacent grip handle 1. The left strap 22 is provided with a buckle 221, which is bent. The right strap 23 is provided with a locking block 231, which has a through notch 232 that engages with the locking block 231. The buckle 221 is composed of a horizontal part 222, a vertical part 223, and a bent part 224 connected in sequence. The horizontal part 222 is connected to the left strap 22, and the vertical part 223 is connected to the horizontal part 224. 2. The bending part 224 and the horizontal part 222 are arranged relatively vertically and parallel to each other. When the buckle 221 and the notch 232 are engaged, the vertical part 223 is inserted into the notch 232 and the bottom wall of the bending part 224 abuts against the top wall of the block 231. Several fixed shafts 14 are evenly distributed circumferentially on the outer peripheral walls of the two mating parts 11 of the grip 1. The second elastic band 3 has a radial cross-section that is rhomboid and the two ends of the rhombus are connected to the force-bearing parts 31. The second elastic band 3 is located between the two grips 1. Several connecting strips 32 are connected to the two force-bearing parts 31. Several connecting strips 32 correspond one-to-one with several fixed shafts 14, and each connecting strip 32 has a through hole 321 for the corresponding fixed shaft 14 to pass through. Each fixed shaft 14 is threaded with a clamping nut 141 for pressing against the outer surface of the connecting bar 32. The connecting bar 32 and the force-bearing part 31 are integrally formed with the second elastic band 3. The outer wall of the grip 1 has a plurality of counterweight holes 15, which are evenly distributed along the opening direction of the grip 1. The second adjustment structure includes a plurality of counterweight columns 6, which correspond one-to-one with a plurality of counterweight holes 15, and each counterweight column 6 is threadedly connected to the corresponding counterweight hole 15 to achieve a detachable connection between the counterweight column 6 and the counterweight hole 15. The top wall of the counterweight column 6 is provided with a rotating bar 61 for external users to squeeze and drive the counterweight column 6 to rotate. The inner wall of the grip 1 has a grip pad 71 along the arc direction of the center 12.The grip pad 71 is located near the center 12 and has a groove 72 for placing the fingers of external users. The grip pad 71 is made of elastic material.

[0030] I. Usage procedure based on the first elastic band: 1. Preliminary preparation: Check that the movable slots of the two grips are clean and free of debris, and ensure that the reset structure (flat spiral spring) is not stuck; assemble the left and right belt bodies of the first elastic band with the corresponding flat spiral spring connecting ends of the two grips, so that the end of the left belt body is placed into the connecting end slot, and after ensuring that the mating hole and the positioning hole are coaxially aligned, tighten the positioning pin to complete the fixation; connect and fix the left belt body and the right belt body by engaging the notch of the buckle and the notch of the buckle, and check that the connection is firm to prevent it from falling off.

[0031] 2. Personalized adjustment: Based on your pregnancy stage and hand weight-bearing capacity, adjust the weight of the handle through the second adjustment structure. Rotate the rotating bar on the top wall of the counterweight column to connect the corresponding number of counterweight columns to the counterweight holes in the handle, ensuring even distribution of the weight. Rotate the handle of the first adjustment structure to drive the adjustment shaft to move the damping pad, adjust the contact pressure between the damping pad and the first elastic band, set the appropriate tensile damping strength, and confirm that the position of the damping pad is fixed after adjustment.

[0032] 3. Resistance Training: Hold the central arc-shaped area of ​​the handle with both hands, and place your fingers in the slots of the grip pad to ensure a stable and comfortable grip; slowly stretch the first elastic band to both sides, feeling the resistance from the damping, hold the stretched state for 10-30 seconds, and then slowly relax. At this time, the flat spiral spring of the reset structure releases its elastic restoring force, driving the first elastic band to automatically retract and reset into the movable slot; repeat the above stretching-relaxation action to complete the preset number of training sets.

[0033] 4. Post-training cleanup: After training, you can choose to store the handle directly or replace the first elastic band with the second elastic band as needed, or disassemble it: press the bent part of the buckle to release the buckle and the locking block, and separate the left and right belt bodies; if you no longer need to use it, you can unscrew the positioning pin and remove the first elastic band for storage; check whether the moving groove, damping pad and other parts are clean, and place the handle in a dry and ventilated place for storage.

[0034] II. Usage procedure based on the second elastic band: 1. Preliminary preparation: Check whether the fixed shaft on the outer peripheral wall of the mating part of the grip is intact and whether the reset structure in the movable groove is not stuck; select a second elastic band that is suitable for your training intensity, and align the connecting strips at both ends of the band with the fixed shafts of the two grips one by one, so that the fixed shafts pass through the holes of the connecting strips; tighten the clamping nuts on each fixed shaft to firmly press the connecting strips onto the fixed shafts, ensuring that the second elastic band is positioned between the two grips and is evenly tensioned without any skewing.

[0035] 2. Personalized adjustment: Based on your own hand strength and weight-bearing tolerance during pregnancy, adjust the weight of the grip through the second adjustment structure, rotate the rotating bar to disassemble and install the weight column, so that the weight of the grip meets your needs; rotate the handle of the first adjustment structure to adjust the contact pressure between the damping pad and the outer ring free part of the reset structure, set an appropriate tensile damping strength, and ensure that the position of the damping pad is stable after adjustment, without affecting the stretching stroke of the second elastic band.

[0036] 3. Resistance Training: Hold the curved grip pad in the middle of the handle with both hands, and insert your fingers into the placement slot for a stable grip. According to the training needs, slowly stretch the second elastic band to both sides with both hands, using its high elasticity of diamond grid structure to perform resistance training. After holding the stretched state, slowly relax. The reset structure drives the roller to rotate, causing the second elastic band to retract and return to its original position. You can adjust the stretching amplitude and frequency according to your own situation to complete the preset number of training sets. During the training process, ensure that the second elastic band is subjected to uniform force and there is no localized pulling phenomenon.

[0037] 4. Post-training cleanup: After training, you can choose to directly store the grip or replace the second elastic band with the first elastic band as needed, or disassemble it: loosen the clamping nut on the fixed shaft, remove the second elastic band. If you need to replace the second elastic band with one of different elastic strengths, repeat the assembly steps in the previous preparation. Check the mesh structure and connecting strips of the second elastic band for damage. Clean the grip and the moving groove. Organize and store each part separately to avoid excessive bending or compression of the second elastic band.

[0038] To improve the storage efficiency and reduce the space occupied by the grips in the above-described technology, magnetic rings are provided at the mating ends of the grips. By bringing the two grips together, the two magnetic rings on one grip correspond one-to-one with the two magnetic rings on the other grip and magnetically attract each other, thereby closing the movable slots and allowing the two grips to connect. This reduces the space occupied and improves storage efficiency. Simultaneously, a first elastic band can be accommodated in the movable slot of one grip, while a second elastic band is placed in the movable slot of the other grip, further reducing the space occupied. The magnetic rings are designated as 16 in the accompanying drawings.

[0039] It should be noted that the specific size, model and shape of each component in the multifunctional upper limb resistance trainer involved in this patent are not limited. In actual application, they can be flexibly adjusted according to the physical characteristics, hand size, training intensity requirements and manufacturing conditions of pregnant women at different stages of pregnancy. As long as the corresponding cooperation relationship and preset functions of each component can be achieved, the adaptability and practicality of the trainer can be improved.

[0040] The spacing between the two grips in the attached diagram of the above instruction manual is only for illustrative purposes and can be adjusted according to actual needs, such as by replacing the first and second elastic bands with different lengths; the attached diagram of the above instruction manual only illustrates the position of the counterweight column and its linkage structure, and does not limit the quantity and size, which can be adjusted according to actual conditions.

[0041] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A multifunctional upper limb resistance training device, characterized in that: The device includes two grips, each grip consisting of two mating parts and a central part, with the two mating parts arranged parallel to each other. The central part has an arc-shaped radial cross-section. Each mating part has a movable groove that extends to the central part. The two movable grooves of one grip correspond one-to-one with the two movable grooves of the other grip and are arranged opposite each other. Each movable groove is connected to its corresponding movable groove by an elastic cord assembly. The central part has a reset structure at each of the two adjacent movable groove positions for driving the elastic cord assembly to retract and reset into the movable groove when the elastic cord assembly is not subjected to external stress. A first adjustment structure is provided between the mating part and the adjacent reset structure for cooperating with the reset structure to adjust the tensile damping strength of the elastic cord assembly. A second adjustment structure is provided on the grip for adjusting the weight of the grip.

2. The multifunctional upper limb resistance training device according to claim 1, characterized in that: The elastic cord assembly includes a first elastic band and a second elastic band. Either the first elastic band or the second elastic band is detachably coupled to two grip handles. The first elastic band is flat. The second elastic band is woven from at least two elastic cords as warp and weft weaving units using an interlacing weaving process to form a preset grid pattern. The first elastic band is made of thermoplastic rubber, and the elastic cords in the second elastic band are made of high-elastic spandex.

3. A multifunctional upper limb resistance training device according to claim 2, characterized in that: The reset structure includes a flat spiral spring, which is formed by winding a flat elastic steel sheet along a central axis to form a spiral structure. The flat spiral spring has an inner ring positioning part and an outer ring free part. A positioning shaft is provided in the middle corresponding to the positions of the two flat spiral springs. The positioning shaft is inserted into the shaft hole of the inner ring positioning part. The inner ring positioning part is movably mounted on the positioning shaft. The outer ring free part extends towards the opening of the movable groove and has a connecting end. A groove is opened on the outer wall of the connecting end for the end of the first elastic band to be inserted. A positioning hole is passed through the connecting end and passes through the groove. A positioning pin is threaded into the positioning hole. Both ends of the first elastic band have mating holes. When the end of the first elastic band is inserted into the groove, the mating hole and the positioning hole are coaxially aligned and the positioning pin passes through the mating hole.

4. A multifunctional upper limb resistance training device according to claim 3, characterized in that: The first adjustment structure includes a damping pad, which is movably disposed in the movable groove and positioned near the opening of the movable groove. The grip has an adjustment hole corresponding to the position of the movable groove, and an adjustment shaft is threaded into the adjustment hole. The beginning end of the adjustment shaft is inserted into the movable groove and rotatably connected to the top wall of the damping pad. The end of the adjustment shaft extends out of the grip to form a rotating handle for external users to rotate. The bottom wall of the damping pad is a contact surface for contacting the top wall of the first elastic band or the top wall of the free part of the outer ring. The damping pad is made of nylon or nitrile rubber.

5. A multifunctional upper limb resistance training device according to claim 4, characterized in that: The contact surface is evenly distributed with a number of damping protrusions for abutting against the top wall of the first elastic band or the top wall of the free part of the outer ring. The damping protrusions are made of elastic rubber material.

6. A multifunctional upper limb resistance training device according to claim 4, characterized in that: A mating pad is connected to the inner wall of the movable groove. The mating pad is arranged opposite to the damping pad. The mating pad is made of nylon or nitrile rubber. The top wall of the mating pad is a mating surface for contacting the bottom wall of the first elastic band or the bottom wall of the outer ring free part.

7. A multifunctional upper limb resistance training device according to claim 2, characterized in that: The first elastic band is divided into a left band and a right band. The left and right bands are respectively connected to two grips. The left band is connected to the connecting end of the corresponding flat spiral spring on the adjacent grip, and the right band is connected to the connecting end of the corresponding flat spiral spring on the adjacent grip. The left band is provided with a buckle, which is bent. The right band is provided with a locking block, which has a through notch. The notch engages with the locking block. The buckle is composed of a horizontal part, a vertical part, and a bent part connected in sequence. The horizontal part is connected to the left band, the vertical part is perpendicular to the horizontal part, and the bent part is parallel to the horizontal part. When the buckle engages with the notch, the vertical part is inserted into the notch and the bottom wall of the bent part abuts against the top wall of the locking block.

8. A multifunctional upper limb resistance training device according to claim 2, characterized in that: The outer peripheral walls of the two mating parts of the grip are each circumferentially distributed with several fixed shafts. The radial cross-section of the second elastic band is diamond-shaped and the two ends of the diamond are connected to force-bearing parts. The second elastic band is located between the two grips. Several connecting strips are connected to the two force-bearing parts. The several connecting strips correspond one-to-one with the several fixed shafts, and each connecting strip has a through hole for the corresponding fixed shaft to pass through. Each fixed shaft is threaded with a clamping nut for pressing against the outer surface of the connecting strip. The connecting strips and force-bearing parts are integrally formed with the second elastic band.

9. A multifunctional upper limb resistance training device according to claim 1, characterized in that: The outer wall of the grip has a plurality of counterweight holes, which are evenly distributed along the opening direction of the grip. The second adjustment structure includes a plurality of counterweight columns, which correspond one-to-one with the plurality of counterweight holes, and each counterweight column is threadedly connected to the corresponding counterweight hole to achieve a detachable connection between the counterweight column and the counterweight hole. The top wall of the counterweight column is provided with a rotating bar for external users to squeeze and drive the counterweight column to rotate.

10. A multifunctional upper limb resistance training device according to claim 1, characterized in that: A grip pad is provided on the inner wall of the grip along the central arc direction. The grip pad is located near the center and has a groove for placing the fingers of external users. The grip pad is made of elastic material.

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