A sitting posture leg flexion and extension trainer

Abstract

This invention relates to the field of fitness equipment, and more particularly to a seated leg extension trainer. The seated leg extension trainer includes a bottom support base; a weight box is fixedly installed on one side of the top of the bottom support base; two parallel guide rods are fixedly installed on the inner sidewall of the weight box along the vertical direction; multiple stackable weight blocks are slidably sleeved on the outer sides of the two guide rods; and a rope is fixedly connected to the top center of the uppermost weight block. The seated leg extension trainer provided by this invention, through the linkage structure of a resistance clutch component and a resistance application component, can not only adjust the basic resistance by increasing or decreasing the number of weight blocks, but also apply additional resistance by raising and lowering the weight blocks through the resistance application component. Furthermore, the resistance can be controlled by adjusting the cam eccentricity and the elastic extension and contraction of the abutment spring, meeting the needs of different training scenarios.

Description

Technical Field

[0001] This invention relates to the field of fitness equipment, and more particularly to a seated leg flexion and extension trainer. Background Technology

[0002] Seated leg extension and flexion exercises are a classic lower limb strength training and functional rehabilitation movement. Their background can be explored from three core dimensions: the origin of rehabilitation medicine, the development of exercise training, and the evolution of population needs. Essentially, they have been gradually improved around the goal of "improving lower limb function, preventing injuries, and adapting to different scenarios," and have become one of the basic movements in the field of modern rehabilitation and fitness.

[0003] Currently, most training devices can only adjust the training resistance by increasing or decreasing the number of weights, and cannot achieve dynamic adjustment of resistance. This makes it difficult to meet the needs of users for resistance changes at different training stages or with different training goals. Furthermore, when no additional resistance is needed, the resistance components are difficult to separate from the weights quickly, which can easily interfere with the raising and lowering of the weights and affect the smoothness of training.

[0004] Therefore, it is necessary to provide a new seated leg flexion and extension trainer to solve the above-mentioned technical problems. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, a seated leg flexion and extension trainer is provided to solve the above-mentioned problems.

[0006] The seated leg flexion and extension trainer provided by this invention includes: a bottom support base; a counterweight box is fixedly installed on one side of the top of the bottom support base, and two parallel guide rods are fixedly installed on the inner side wall of the counterweight box along the vertical direction. Multiple stackable counterweight blocks are slidably sleeved on the outer sides of the two guide rods, and a rope is fixedly connected to the top center of the uppermost counterweight block; the end of the rope away from the counterweight block passes through a pre-set pulley assembly inside the counterweight box and connects to the leg execution component of the trainer to achieve linkage between the movement of the leg execution component and the lifting and lowering of the counterweight block; wherein, a follower plate is also installed inside the counterweight box on the outer side of the rope, and the follower plate has guide grooves that correspond one-to-one with and fit the two guide rods. The follower plate slides with the guide rods through the guide grooves. The system is dynamically coordinated, and a resistance clutch assembly is installed at the bottom of the follower plate; a resistance application assembly is also provided above the counterweight in the counterweight box, with the output end of the resistance application assembly facing the counterweight, and by adjusting the output of the resistance application assembly, the resistance encountered by the counterweight when it is lifted upward can be increased; the resistance clutch assembly is detachably connected to the resistance application assembly, and the resistance clutch assembly can trigger the resistance application assembly to start when the rope is subjected to force and moves, thereby realizing the automatic increase of resistance; a lifting assembly is connected to the side of the two guide slides that are relatively far apart, and the output end of the lifting assembly is connected to the fixed end of the resistance application assembly. By driving the output end of the lifting assembly to move upward, the resistance application assembly can be moved upward as a whole, thereby separating the output end of the resistance application assembly from the counterweight.

[0007] Preferably, the resistance clutch assembly includes a bidirectional screw that is rotatably connected to the bottom of the follower plate. The bidirectional screw has a hole at its axis for a rope to pass through. Both outer ends of the bidirectional screw are threaded with threaded blocks. Both sides of the two threaded blocks are connected with clutch rods. The ends of the clutch rods on the same side away from the threaded blocks are connected to a toothed plate. The relatively far sides of the two toothed plates are meshed with gears. Both sides of the two gears are connected to guide slide rods through brackets.

[0008] Preferably, a worm gear is installed on the outer bottom of the bidirectional screw, and a worm is meshed with one side of the worm gear. Both ends of the worm are connected to the bottom of the follower plate through connecting brackets, and a driving component for driving the worm to rotate is installed on one side of one of the connecting brackets.

[0009] Preferably, the top of each of the two toothed plates is connected to a wedge-shaped block, and the bottom sides of the follower plate are respectively provided with wedge-shaped grooves for the wedge-shaped blocks to slide.

[0010] Preferably, the resistance application component includes cams connected to both sides of the two gears respectively, each cam having a bottom abutting block, each abutting block having a bottom connected to a sliding sleeve, each sliding sleeve having a support rod slidably connected to its inner bottom, and each support rod having a common bottom connected to a support base frame.

[0011] Preferably, the outer side of the sliding sleeve and the support rod are both fitted with an abutment spring, and the two ends of the abutment spring abut against the abutment block and the support base frame, respectively.

[0012] Preferably, the supporting base frame is a hollow structure and is located on the outside of the two guide rods.

[0013] Preferably, the lifting assembly includes support platforms respectively installed on the outer sides of the two guide slides, each support platform having an electric winch installed on its top, each electric winch having a lifting cable connected to it, and the end of each lifting cable away from the electric winch being connected to the support base frame.

[0014] Compared with related technologies, the seated leg flexion and extension trainer provided by the present invention has the following beneficial effects:

[0015] This invention achieves fine-tuning of resistance: by setting a linkage structure between the resistance clutch component and the resistance application component, not only can the basic resistance be adjusted by increasing or decreasing the number of counterweights, but additional resistance can also be applied to the lifting and lowering of the counterweights through the resistance application component. Furthermore, the resistance can be controlled by adjusting the cam eccentricity and the elastic extension and contraction of the contact spring, thus meeting the needs of different training scenarios.

[0016] The resistance clutch assembly of this invention drives the toothed plate and gear to mesh through worm gear transmission, thereby triggering the cam to rotate and apply resistance. The transmission is stable and the triggering is sensitive. The lifting assembly can quickly separate the resistance application assembly from the counterweight, avoiding interference problems when not in use. At the same time, the limiting block at the top of the guide slide can prevent the counterweight from falling off, improving the safety of use. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of the seated leg flexion and extension trainer provided by the present invention;

[0018] Figure 2 for Figure 1 The diagram shows the structure of the counterweight box.

[0019] Figure 3 for Figure 1 The diagram shows the structure of one of the resistance clutch components;

[0020] Figure 4 for Figure 1 The diagram shows the structure of the second resistance clutch assembly.

[0021] Figure 5 for Figure 1 The diagram shows the structure of the resistance application component;

[0022] Figure 6 for Figure 1 The diagram shows the structure of the lifting component.

[0023] The following are the labels in the diagram: 1. Bottom support base; 11. Counterweight box; 12. Guide slide rod; 13. Counterweight block; 14. Rope; 15. Follower plate; 2. Double-acting screw; 21. Threaded block; 22. Clutch rod; 23. Gear plate; 24. Gear; 25. Worm gear; 26. Worm; 27. Wedge block; 28. Wedge groove; 3. Cam; 31. Abutment block; 32. Sliding sleeve; 33. Support rod; 34. Support base frame; 35. Abutment spring; 4. Support platform; 41. Electric winch; 42. Lifting cable. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0026] This invention provides a seated leg flexion and extension trainer, comprising: a bottom support base 1; a counterweight box 11 fixedly installed on one side of the top of the bottom support base 1; two parallel guide rods 12 fixedly installed on the inner side wall of the counterweight box 11 along the vertical direction; multiple stackable counterweight blocks 13 are slidably sleeved on the outer sides of the two guide rods 12; and a rope 14 is fixedly connected to the top center of the uppermost counterweight block 13; the end of the rope 14 away from the counterweight block 13 passes through a pre-set pulley assembly inside the counterweight box 11 and connects to the leg execution component of the trainer to realize the linkage between the movement of the leg execution component and the lifting and lowering of the counterweight block 13; wherein, a follower plate 15 is also installed inside the counterweight box 11 on the outer side of the rope 14, and the follower plate 15 has guide grooves that correspond one-to-one with and fit the two guide rods 12. The movable plate 15 slides with the guide slide rod 12 via a guide groove, and a resistance clutch assembly is installed at the bottom of the movable plate 15. A resistance application assembly is also provided in the counterweight box 11 above the counterweight block 13. The output end of the resistance application assembly faces the counterweight block 13, and by adjusting the output of the resistance application assembly, the resistance encountered by the counterweight block 13 when it is lifted upward can be increased. The resistance clutch assembly and the resistance application assembly are detachably connected. The resistance clutch assembly can trigger the resistance application assembly to start when the rope 14 is moved under force, thereby realizing the automatic increase of resistance. A lifting assembly is connected to the side of the two guide slide rods 12 that are relatively far apart. The output end of the lifting assembly is connected to the fixed end of the resistance application assembly. By driving the output end of the lifting assembly to move upward, the resistance application assembly can be moved upward as a whole, thereby separating the output end of the resistance application assembly from the counterweight block 13.

[0027] It should be noted that: the bottom support base 1 provides basic support for the entire trainer, ensuring the stability of the equipment during use; the counterweight box 11, fixedly installed on one side of its top, is used to accommodate and install counterweight-related components, providing installation space for weight adjustment during training; two parallel guide rods 12, fixedly installed vertically on the inner wall of the counterweight box 11, mainly serve a guiding function, ensuring that multiple stackable counterweights 13 can rise and fall stably in a fixed direction, preventing the counterweights 13 from shifting or getting stuck during movement; the rope 14, fixedly connected to the top center of the uppermost counterweight 13, is a key component connecting the counterweight 13 to the leg actuator of the trainer. When the user exerts force through the leg actuator, the rope 14 will successively pass around the pre-set pulley assembly inside the counterweight box 11, driving the counterweight 13 to rise and fall along the guide rods 12, thereby realizing the linkage between the movement of the leg actuator and the rise and fall of the counterweight 13, allowing the user to obtain corresponding training resistance; the follower plate 15, installed outside the rope 14 inside the counterweight box 11, through openings on it and... Two guide rails 12 are paired with corresponding guide grooves that slide together to ensure the follower plate 15 can move stably along the guide rails 12. The resistance clutch assembly at the bottom of the follower plate 15 can trigger the resistance application assembly when the rope 14 is under force. The resistance application assembly located above the counterweight 13 inside the counterweight box 11 has its output end facing the counterweight 13. By adjusting the output of the resistance application assembly, the resistance encountered when the counterweight 13 is lifted can be increased, meeting the user's needs for different training intensities. The resistance clutch assembly and the resistance application assembly are detachably connected, facilitating subsequent maintenance or replacement. Furthermore, the lifting assembly, located on the opposite side of the two guide rails 12, has its output end connected to the fixed end of the resistance application assembly. When it is necessary to stop the resistance application assembly from applying resistance to the counterweight 13, the output end of the lifting assembly is driven upwards, causing the entire resistance application assembly to move upwards, thereby separating the output end of the resistance application assembly from the counterweight 13 and releasing the resistance. The pulley assembly and leg actuator are both existing and mature technologies, and will not be described further here.

[0028] In an embodiment of the present invention, the resistance clutch assembly includes a bidirectional screw 2 rotatably connected to the bottom of the follower plate 15. The axis of the bidirectional screw 2 has a hole for the rope 14 to pass through. Both ends of the outer side of the bidirectional screw 2 are threaded with threaded blocks 21. Both sides of the two threaded blocks 21 are connected with clutch rods 22. The ends of the clutch rods 22 on the same side away from the threaded blocks 21 are connected to a toothed plate 23. The relatively far sides of the two toothed plates 23 are meshed with gears 24. Both sides of the two gears 24 are connected to the guide slide rod 12 through brackets. A worm gear 25 is installed at the bottom of the outer side of the bidirectional screw 2. One side of the worm gear 25 is meshed with a worm 26. Both ends of the worm 26 are connected to the bottom of the follower plate 15 through connecting brackets. A driving component for driving the worm 26 to rotate is installed on one side of one of the connecting brackets. The top of the two toothed plates 23 is connected with a wedge block 27. The bottom sides of the follower plate 15 are respectively provided with wedge grooves 28 for the wedge blocks 27 to slide.

[0029] It should be noted that in the resistance clutch assembly, the bidirectional screw 2, as the core transmission component, is rotatably connected at one end to the bottom of the follower plate 15. The hole in its shaft for the rope 14 to pass through avoids interference between the bidirectional screw 2 and the rope 14 during rotation, while allowing the rope 14 to normally drive the counterweight 13 up and down. The threaded blocks 21, threaded at both ends of the bidirectional screw 2, can move relatively closer or further away along the axis of the bidirectional screw 2 during rotation, thereby driving the subsequent components. The two threaded blocks 21 are connected on both sides... The clutch lever 22 transmits force, converting the movement of the threaded block 21 into pushing or pulling the gear plate 23. The ends of the clutch lever 22 located on the same side, away from the threaded block 21, are connected to the gear plate 23, allowing the gear plate 23 to move stably under the action of the clutch lever 22. The gear 24, meshing with the two gear plates 23 on opposite sides, converts the linear motion of the gear plate 23 into its own rotational motion through meshing with the gear plate 23. The gear 24 is connected to the guide slide rod 12 on both sides via brackets, ensuring the secure installation of the gear 24. The stability of the gear 24 is ensured, allowing it to rotate smoothly under the drive of the gear plate 23. The worm gear 25 mounted on the bottom outer side of the double-sided screw 2 and the worm 26 meshing with one side form a worm gear transmission mechanism, which can stably transmit the power of the driving component to the double-sided screw 2. At the same time, the two ends of the worm 26 are connected to the bottom of the follower plate 15 through connecting brackets, ensuring the firmness of the worm 26 installation and the stability during rotation. The driving component mounted on one side of one of the connecting brackets is the power source of the entire resistance clutch assembly. The driving component is either a hand crank or an electric motor, which drives the clutch. The worm 26 rotates, which in turn drives the worm wheel 25 and the bidirectional screw 2 to move in sequence. The wedge blocks 27 connected to the top of the two toothed plates 23 cooperate with the wedge grooves 28 opened on both sides of the bottom of the follower plate 15. On the one hand, they guide the movement of the toothed plates 23 and prevent the toothed plates 23 from deviating during the movement. On the other hand, the wedge structure can enhance the stability of the toothed plates 23 during the movement, ensuring that the toothed plates 23 and the gears 24 always maintain a good meshing state, thereby ensuring the reliability of the entire resistance clutch assembly transmission, and finally realizing the triggering of the resistance application assembly.

[0030] In an embodiment of the present invention, the resistance application component includes cams 3 connected to both sides of the two gears 24 respectively. The bottom of each cam 3 abuts against abutting block 31. The bottom of each abutting block 31 is connected to a sliding sleeve 32. The bottom inner side of each sliding sleeve 32 is slidably connected to a support rod 33. The bottom of each support rod 33 is connected to a support base frame 34. The outer sides of the sliding sleeve 32 and the support rod 33 are sleeved with abutting spring 35. The two ends of the abutting spring 35 abut against the abutting block 31 and the support base frame 34 respectively. The support base frame 34 is a hollow structure and is located outside the two guide slide rods 12.

[0031] It should be noted that in the resistance application assembly, cam 3, as a key component for power transmission and resistance conversion, is connected to both sides of the two gears 24. When the gears 24 in the resistance clutch assembly rotate under the drive of the gear plate 23, the gears 24 synchronously drive cam 3 to rotate. Utilizing the eccentric structure of cam 3, it generates periodic resistance pressure on the lower component during rotation. The abutment block 31 at the bottom of each cam 3 mainly serves to transmit force, stably transmitting the resistance pressure generated when the cam 3 rotates to the lower sliding sleeve 32. It also cooperates with the abutment spring 35 to achieve a reset function. The sliding sleeve 32 connected to the bottom of the abutment block 31 has its inner bottom slidably engaged with the support rod 33. This provides guidance for the up-and-down movement of the sliding sleeve 32, ensuring stable movement of the sliding sleeve 32 along the axis of the support rod 33, and also drives the abutment block 31 to maintain a good contact state with the cam 3 through its own movement. The support rod 33 slidably connected to the inner side of each sliding sleeve 32 is connected to the support base frame at the bottom. 34 provides a stable support base for components such as the sliding sleeve 32 and the abutment block 31, limiting the range of movement of each component and preventing deviation. The abutment spring 35, which is sleeved on the outer side of the sliding sleeve 32 and the support rod 33, abuts against the abutment block 31 and the support base frame 34 at both ends. When the cam 3 applies downward pressure to the abutment block 31, the abutment spring 35 is compressed and generates an elastic restoring force. This restoring force ensures that the abutment block 31 is always in close contact with the cam 3, ensuring the continuity of power transmission. On the other hand, when the cam 3 rotates to the non-pressurized position, it can push the abutment block 31 and the sliding sleeve 32 to reset, preparing for the next resistance application. The support base frame 34, which has a hollow structure and is located outside the two guide slide rods 12, is not only the mounting carrier of the support rod 33, but also provides overall support for the entire resistance application assembly. Its hollow structure can also avoid interference with the guide slide rods 12, ensuring the normal lifting and lowering of the counterweight 13 on the guide slide rods 12, while enhancing the compatibility of the assembly with the overall structure of the trainer.

[0032] In an embodiment of the present invention, the lifting assembly includes support platforms 4 respectively installed on the outer sides of the two guide slide rods 12. Electric winches 41 are installed on the top of the two support platforms 4, and lifting cables 42 are connected to the two electric winches 41. The ends of the two lifting cables 42 away from the electric winches 41 are connected to the support base frame 34.

[0033] It should be noted that: In the lifting assembly, the support platform 4 serves as the mounting base, installed on the outer side of the two guide slides 12. Its core function is to provide a stable mounting platform for the electric winch 41, ensuring that the electric winch 41 will not shift due to vibration or force during operation. Simultaneously, the support force of the guide slides 12 further enhances the stability of the support platform 4 itself. The electric winch 41, mounted on top of the two support platforms 4, is the power core of the lifting assembly. It can achieve forward and reverse rotation through the drive of an internal motor, thereby controlling the winding and unwinding of the lifting cable 42 and providing power for the lifting action. The lifting cable 42, connected to the electric winch 41, is the key component for power transmission. Its end furthest from the electric winch 41 connects to the resistance application component. The support frame 34 is connected to the electric winch 41. When the electric winch 41 starts and winds up the lifting cable 42, the lifting cable 42 generates an upward pulling force, causing the support frame 34 to move upward along the guide slide rod 12. The upward movement of the support frame 34 simultaneously causes the entire resistance application component to move upward, ultimately separating the output end of the resistance application component from the counterweight 13 and releasing the resistance effect on the counterweight 13. Conversely, when the electric winch 41 releases the lifting cable 42, the resistance application component will reset downward under its own gravity, restoring its ability to apply resistance to the counterweight 13. The entire process, through the precise control of the electric winch 41, enables the rapid and stable lifting and lowering of the resistance application component, meeting the needs of resistance switching during training. The distance between the resistance application component and the counterweight 13 is approximately 45mm to 55mm to prevent interference between the user and the component when the resistance application component is not in use.

[0034] The working principle of the seated leg flexion and extension trainer provided by this invention is as follows: When using the device, the user first sets the basic resistance by increasing or decreasing the number of counterweights 13 stacked on the outer side of the guide slide 12 according to training needs. Then, the user sits on the seat cushion of the leg execution component, with their back against the backrest, and their feet against the push plate and push. The push plate drives the rope 14 to move through the connecting rod. The rope 14 passes around the pulley assembly inside the counterweight box 11 and pulls the uppermost counterweight 13 to slide upward along the guide slide 12, realizing the basic seated leg flexion and extension training movement. When additional resistance is needed, it is controlled by the outer wall of the counterweight box 11. The panel activates the drive unit of the resistance clutch assembly, which drives the worm 26 to rotate. The worm 26 meshes with the worm wheel 25, causing the bidirectional screw 2 to rotate synchronously. Since the threads at both ends of the bidirectional screw 2 turn in opposite directions, the two threaded blocks 21 on the outer side will move away from each other along the screw axis. The threaded blocks 21 push the toothed plate 23 to move horizontally along the wedge groove 28 at the bottom of the follower plate 15 through the clutch rod 22. The toothed plate 23 meshes with the gear 24, causing the gear 24 to rotate. The gear 24 synchronously drives the cams 3 on both sides to rotate. During the rotation, the cams 3 use an eccentric structure to periodically press down on the abutment block 31 below. The force is applied by the abutment block 31, which transmits pressure to the sliding sleeve 32, causing the sliding sleeve 32 to slide downward along the support rod 33 and compress the abutment spring 35. The elastic restoring force of the abutment spring 35 acts in the opposite direction on the abutment block 31, thereby indirectly generating resistance to the follower plate 15 through components such as the cam 3, gear 24, and toothed plate 23. The follower plate 15 slides with the guide slide rod 12, ultimately transmitting the resistance to the rope 14, increasing the difficulty of lifting the counterweight block 13 and achieving the dynamic application of additional resistance. When no additional resistance is needed, the reverse drive component is reversed, causing the toothed plate 23 to separate from the gear 24, and the electric winch of the lifting assembly is activated. 41. The electric winch 41 winds up the lifting cable 42, which pulls the support base frame 34 upward. The support base frame 34 drives the entire resistance application assembly, including the support rod 33, sliding sleeve 32, abutment block 31, and cam 3, to move upward synchronously, separating the cam 3 from the area above the counterweight 13 and relieving the additional resistance on the counterweight 13. At this time, the user only needs to overcome the basic resistance of the counterweight 13 for training. If the training is over or adjustments are needed, after releasing the push plate, the counterweight 13 returns to its original position along the guide slide rod 12 under its own weight. The rope 14 pulls the push plate back to the initial position, ready for the next use.

[0035] The circuits and controls involved in this invention are all existing technologies and will not be described in detail here.

[0036] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A seated leg flexion and extension trainer, characterized in that, include: Bottom support (1); A counterweight box (11) is fixedly installed on one side of the top of the bottom support (1). Two parallel guide slide rods (12) are fixedly installed on the inner side wall of the counterweight box (11) in the vertical direction. Multiple stackable counterweight blocks (13) are slidably sleeved on the outer side of the two guide slide rods (12). A rope (14) is fixedly connected to the top center of the uppermost counterweight block (13). The end of the rope (14) away from the counterweight (13) passes through the pre-set pulley assembly inside the counterweight box (11) and then connects to the leg execution component of the trainer to realize the linkage between the movement of the leg execution component and the lifting and lowering of the counterweight (13); Among them, a follower plate (15) is installed inside the counterweight box (11) on the outside of the rope (14). The follower plate (15) has guide grooves that correspond to and are adapted to the two guide slide rods (12). The follower plate (15) slides with the guide slide rods (12) through the guide grooves. The bottom of the follower plate (15) is equipped with a resistance clutch assembly. A resistance application component is also provided inside the counterweight box (11) above the counterweight block (13). The output end of the resistance application component is set towards the counterweight block (13), and by adjusting the output of the resistance application component, the resistance encountered by the counterweight block (13) when it is lifted upward can be increased. The resistance clutch assembly is detachably connected to the resistance application assembly. The resistance clutch assembly can trigger the resistance application assembly to start when the rope (14) is under force and moves, thereby realizing the automatic increase of resistance. A lifting component is connected to the side of the two guide slides (12) that are relatively far apart. The output end of the lifting component is connected to the fixed end of the resistance application component. By driving the output end of the lifting component to move upward, the resistance application component can be moved upward as a whole, thereby separating the output end of the resistance application component from the counterweight (13).

2. The seated leg flexion and extension trainer according to claim 1, characterized in that, The resistance clutch assembly includes a bidirectional screw (2) rotatably connected to the bottom of the follower plate (15). The bidirectional screw (2) has a hole at its axis for the rope (14) to pass through. Both ends of the bidirectional screw (2) are threaded with threaded blocks (21). Both sides of the two threaded blocks (21) are connected with clutch rods (22). The ends of the clutch rods (22) on the same side away from the threaded blocks (21) are connected with toothed plates (23). The sides of the two toothed plates (23) that are relatively far apart are meshed with gears (24). Both sides of the two gears (24) are connected to the guide slide rods (12) through brackets.

3. The seated leg flexion and extension trainer according to claim 2, characterized in that, A worm gear (25) is installed on the outer bottom of the bidirectional screw (2). A worm (26) is meshed with one side of the worm gear (25). Both ends of the worm (26) are connected to the bottom of the follower plate (15) through a connecting frame. A drive component for driving the worm (26) to rotate is installed on one side of one of the connecting frames.

4. The seated leg flexion and extension trainer according to claim 2, characterized in that, The top of each of the two toothed plates (23) is connected to a wedge block (27), and the bottom sides of the follower plate (15) are respectively provided with wedge grooves (28) for the wedge block (27) to slide.

5. The seated leg flexion and extension trainer according to claim 2, characterized in that, The resistance application component includes cams (3) connected to both sides of the two gears (24), each cam (3) having a bottom abutting block (31), each abutting block (31) having a bottom connected to a sliding sleeve (32), each sliding sleeve (32) having a support rod (33) slidably connected to the bottom of its inner side, and each support rod (33) having a common bottom connected to a support base frame (34).

6. The seated leg flexion and extension trainer according to claim 5, characterized in that, The sliding sleeve (32) and the support rod (33) are both fitted with abutment spring (35), and the two ends of the abutment spring (35) abut against the abutment block (31) and the support base frame (34) respectively.

7. The seated leg flexion and extension trainer according to claim 6, characterized in that, The supporting base frame (34) is a hollow structure and is located on the outside of the two guide slide rods (12).

8. The seated leg flexion and extension trainer according to claim 1, characterized in that, The lifting assembly includes support platforms (4) respectively installed on the outside of two guide slides (12). Electric winches (41) are installed on the top of the two support platforms (4). Lifting cables (42) are connected to the two electric winches (41). The ends of the two lifting cables (42) away from the electric winches (41) are connected to the support base frame (34).

Images