Lower extremity explosive force training device with variable force arm linkage

Abstract

The present application relates to lower limb training technical field, provide a kind of variable force arm connecting rod's lower limb explosive force training device, including the bottom plate for supporting, the top of the bottom plate is fixedly connected with support seat, the top of the support seat is fixedly connected with the inclined board of lying in inclination, the top of the inclined board of lying is fixedly connected with the connecting frame in right side, the inside of the connecting frame is slidably connected with foot push plate, the bottom of the foot push plate is fixedly connected with lower extension plate in both sides, the top of the connecting frame is fixedly connected with connecting seat, the inside of the connecting seat is installed with variable force arm connecting rod assembly. By realizing training load and lower limb explosive force force curve matching, to strengthen explosive force training effect, solve the problem that existing training device resistance constant, and muscle force law does not match, explosive force limited promotion, realize the stable lifting of counterweight, accurate guidance, to avoid configuration block sway, jam, sudden fall and pull rope partial wear, improve the safety, smoothness and service life of device operation.

Description

Technical Field

[0001] This invention relates to the field of lower limb training technology, specifically to a lower limb explosive power training device with a variable lever arm linkage. Background Technology

[0002] Lower limb explosive power is a key physical quality that determines a person's jumping, sprinting, and rapid changes of direction abilities, playing a crucial role in various competitive sports and daily physical activities. To effectively improve lower limb explosive power, athletes and fitness enthusiasts typically use specialized training equipment for targeted strength training. Currently, most lower limb strength training devices on the market use weights or resistance bands as resistance sources.

[0003] In practical use, the core working principle of these traditional training devices is to directly apply the constant gravity of the counterweights or the linear tension of the elastic bands to the trainee through transmission mechanisms such as pulleys and steel cables. This means that throughout the entire extension movement, the magnitude of the resistance that the trainee's lower limbs resist remains essentially constant.

[0004] However, the muscle power exerted by the human lower limbs during explosive push-off movements is not constant. According to research in sports biomechanics, the output torque of muscles exhibits a non-linear variation with changes in joint angle, typically being weaker at the beginning and end of the movement, and reaching a peak within a certain intermediate angle range. The constant resistance provided by traditional devices cannot match the natural force curve of the human lower limb muscles.

[0005] This mismatch between resistance and power generation limits training effectiveness. At joint angles where muscle strength is weak, constant resistance may be excessive, increasing the risk of injury and inhibiting initiation speed; conversely, at peak muscle strength, the resistance may be insufficient, failing to provide adequate stimulation to maximize explosive power. Therefore, existing training devices suffer from a fundamental problem in improving lower limb explosive power: the training load is mismatched with human biomechanical characteristics, thus limiting training efficiency and effectiveness.

[0006] Therefore, this invention proposes a lower limb explosive power training device with a variable lever arm linkage to address the shortcomings of existing technologies. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a lower limb explosive power training device with a variable lever arm linkage. This device solves the problems of existing lower limb explosive power training devices, such as constant resistance, inability to match the muscle force curve with changes in the lower limb extension angle, easy swaying and jamming during weight lifting, inconvenient load adjustment, and lack of stable leverage during training.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a lower limb explosive power training device with a variable lever arm linkage, comprising a bottom plate for support, a support seat fixedly connected to the top of the bottom plate, an inclined reclining plate fixedly connected to the top of the support seat, connecting frames fixedly connected to both sides of the top right portion of the inclined reclining plate, a foot push plate slidably connected inside the connecting frame, a lower extension plate fixedly connected to both sides of the bottom end of the foot push plate, a connecting seat fixedly connected to the top of each connecting frame, a variable lever arm linkage assembly installed inside the connecting seat, a support frame fixedly connected to the top right of the bottom plate, an upper pull frame provided on the lower side of the inside of the support frame, multiple configuration blocks stacked inside the upper pull frame, the front middle of the configuration blocks slidably connected to the middle of the support frame, a stabilizing push-pull assembly installed inside the support frame, fixed seats fixedly connected to both sides of the inclined reclining plate, and a lever-assisted handle assembly installed at the top of the fixed seat for leveraging leg power.

[0009] Preferably, the lever assembly includes a rotating flip rod located at the top of the fixed base, an inner limit block is fixedly connected to the inner side of the top of the fixed base, a grip handle is fixedly connected to one side of the top of the flip rod, and an anti-slip rubber sleeve is fixedly connected to the outside of the grip handle.

[0010] Preferably, the lever handle assembly further includes a plug-in block fixed inside the flip rod. The inner limiting block has a slot, and the outside of the plug-in block is nested inside the slot. The inside of the inner limiting block is interspersed with a plug-in block, and the outside of the plug-in block also penetrates the inside of the plug-in block.

[0011] Preferably, the variable force linkage assembly includes a support column fixed inside the connecting seat, and variable force arms rotatably connected to both outer sides of the support column. The left side of the variable force arm is attached to the right side of the foot push plate. Multiple limiting rings are fixedly connected to both outer sides of the support column. The inner side of the limiting ring is connected to the inside of the variable force arm through a torsion spring. A rotating sleeve is rotatably connected to the right side of the variable force arm. A pull rope is fixedly connected to the outside of the rotating sleeve. The bottom end of the pull rope is fixedly connected to the top of the upper pull frame.

[0012] Preferably, the stable push-pull assembly includes support plates fixed on both sides inside the support frame. The bottom end of the support plate is connected to the top end of the upper pull frame through a compression spring. A damping rod is fixedly connected to the bottom inner side of the support plate. The bottom end of the damping rod is fixedly connected to the top end of the upper pull frame. The outside of the pull rope passes through the inside of the support plate.

[0013] Preferably, a fixed column is fixedly connected to the upper inner side of the support frame, and traction rollers are rotatably connected to both outer sides of the fixed column, with the outer side of the pull rope abutting against the inside of the traction rollers.

[0014] Preferably, a plurality of upper limit blocks are fixedly connected to the upper right side of the foot push plate to achieve outward limit of the variable lever arm.

[0015] Preferably, a traction plate is fixedly connected to the inner side of the pull-up frame, and the traction plate has multiple external slots. An internal slot is provided in the middle of the right side of the configuration block. The internal slots are opposite to the external slots. A pin is inserted inside the external slot, and the outside of the pin is inserted inside the internal slot.

[0016] Preferably, a protective rubber pad is fixedly connected to the top right side of the bottom plate, and the configuration block is located at the top of the protective rubber pad.

[0017] Preferably, shoulder support arc plates are fixedly connected to both sides of the top left portion of the inclined reclining board to provide shoulder support for the user.

[0018] This invention provides a lower limb explosive power training device with a variable lever arm linkage. It has the following beneficial effects:

[0019] 1. This invention utilizes the transmission and coordination of the foot push plate, support column, variable lever arm, pull rope, and configuration block inside the upper pull frame. The variable lever arm rotates around the support column to form a variable lever, causing the lever arm of the force application point and the pull point relative to the fulcrum to continuously change with the extension angle during the lower limb extension. This transforms the constant gravity of the configuration block into training resistance that dynamically changes with the joint angle, achieving a match between the training load and the lower limb explosive power curve, thereby enhancing the explosive power training effect. This solves the problems of existing training devices having constant resistance, mismatch with muscle force development patterns, and limited explosive power enhancement.

[0020] 2. This invention uses a stable push-pull assembly consisting of a support plate, a compression spring, a damping rod, and a traction roller. This assembly reliably guides the pull rope through the traction roller on the fixed column and vertically pulls the upper pull frame through the support plate. The compression spring and the damping rod together constrain the lifting trajectory of the upper pull frame, achieving smooth lifting and precise guidance of the counterweight. This avoids shaking, jamming, sudden falling of the configuration block, and uneven wear of the pull rope, thus improving the safety, smoothness, and service life of the device.

[0021] 3. The lever-assisted handle assembly in this invention, consisting of a flipping rod, a fixed base, an inner limiting block, a plug-in block, a pin, and a grip handle, allows the flipping rod to rotate around the fixed base and be inserted into the inner limiting block via the plug-in block, with the angle locked by the pin. This enables the upper body to grip and assist in the exercise, stabilizing the torso and preventing body slippage during the push-off, ensuring accurate force direction. It can also be flipped and stored when not in use, resulting in a compact structure. Combined with the shoulder support arc plate on the inclined lying board for shoulder positioning, the whole assembly forms a stable supine push-off posture, which has the advantages of reasonable structure, convenient operation, safety and reliability, and wide applicability. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a schematic diagram on the right side of the present invention;

[0025] Figure 4 This is a schematic diagram of the support base mechanism of the present invention;

[0026] Figure 5 This is a schematic diagram of the inner mechanism of the support frame of the present invention;

[0027] Figure 6 This is a schematic diagram of the pull-up frame mechanism of the present invention.

[0028] The components are as follows: 1. Bottom support plate; 2. Support seat; 3. Support frame; 4. Inclined reclining board; 5. Connecting frame; 6. Shoulder support arc plate; 7. Foot push plate; 8. Upper limit block; 9. Support column; 10. Variable lever arm; 11. Connecting seat; 12. Tilting rod; 13. Fixed seat; 14. Inner limit block; 15. Pin; 16. Insertion block; 17. Grip handle; 18. Support plate; 19. Pull rope; 20. Traction roller; 21. Fixed column; 22. Compression spring; 23. Damping rod; 24. Traction plate; 25. Pin; 26. Outer slot; 27. Upper pull frame; 28. Lower extension plate; 29. ​​Torsion spring; 30. Configuration block; 31. Limit ring; 32. Protective rubber pad; 33. Inner slot. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example:

[0031] Reference Figures 1-6A lower limb explosive power training device with a variable lever arm linkage includes a bottom plate 1 for support. A support base 2 is fixedly connected to the top of the bottom plate 1. An inclined reclining plate 4 is fixedly connected to the top of the support base 2. Connecting frames 5 are fixedly connected to both sides of the top right of the inclined reclining plate 4. A foot push plate 7 is slidably connected inside the connecting frame 5. A lower extension plate 28 is fixedly connected to both sides of the bottom end of the foot push plate 7. A connecting seat 11 is fixedly connected to the top of the connecting frame 5. A variable lever arm linkage assembly is installed inside the connecting seat 11. A support frame 3 is fixedly connected to the top right of the bottom plate 1. An upper pull frame 27 is provided on the lower side of the inside of the support frame 3. Multiple configuration blocks 30 are stacked inside the upper pull frame 27. The front middle of the configuration blocks 30 is slidably connected to the middle of the support frame 3. The support frame 3 is equipped with a stable push-pull assembly. The inclined reclining board 4 is fixedly connected to both sides of the fixed seat 13. The top of the fixed seat 13 is equipped with a lever handle assembly for leveraging the leg force. The variable force linkage assembly includes a support column 9 fixed inside the connecting seat 11. The support column 9 is rotatably connected to both sides of the outside of the support column 9. The left side of the variable force arm 10 is attached to the right side of the foot push plate 7. Multiple limiting rings 31 are fixedly connected to both sides of the outside of the support column 9. The inside of the limiting ring 31 is connected to the inside of the variable force arm 10 through a torsion spring 29. The right side of the variable force arm 10 is rotatably connected to a rotating sleeve. The outside of the rotating sleeve is fixedly connected to a pull rope 19. The bottom end of the pull rope 19 is fixedly connected to the top of the upper pull frame 27.

[0032] Reference Figures 1-6 The stable push-pull assembly includes support plates 18 fixed on both sides inside the support frame 3. The bottom end of the support plate 18 is connected to the top end of the upper pull frame 27 through a compression spring 22. A damping rod 23 is fixedly connected to the bottom inner side of the support plate 18. The bottom end of the damping rod 23 is fixedly connected to the top end of the upper pull frame 27. The outside of the pull rope 19 passes through the inside of the support plate 18. A fixed column 21 is fixedly connected to the upper inner side of the support frame 3. Traction rollers 20 are rotatably connected to both sides of the outside of the fixed column 21. The outside of the pull rope 19 abuts against the inside of the traction rollers 20. Multiple upper limit blocks 8 are fixedly connected to the upper right side of the foot push plate 7 to achieve the outward tilting limit of the variable lever arm 10.

[0033] During training, the trainee lies supine on the inclined lying board 4, with their shoulders against the shoulder support arc plate 6, and their feet push against the foot push plate 7. The foot push plate 7 slides forward along the connecting frame 5 via the lower extension plate 28. The foot push plate 7 then pushes the variable lever arm 10 that is in contact with it. The variable lever arm 10 rotates with the support column 9 inside the connecting seat 11 as the fulcrum. Its right end is pulled by the pull rope 19 via the rotating sleeve. The pull rope 19 passes around the traction roller 20 assembled on the fixed column 21 to complete the direction change, and pulls the upper pull frame 27 upward. This causes the upper pull frame 27 and the selected hanging configuration block 30 to be raised synchronously, thereby converting the gravity of the configuration block 30 into the counter load of the lower limb extension movement.

[0034] During the rotation of the variable lever arm 10, the force application point of the foot push plate 7 and the traction point of the pull rope 19 relative to the support column 9 will continuously change with the extension angle, so that the training resistance changes dynamically with the extension stroke, matching the force characteristics of the lower limb explosive power; the upper limit block 8 set on the foot push plate 7 limits the outward rotation stroke of the variable lever arm 10 to prevent the mechanism from overtraveling; the torsion spring 29 assembled inside the limit ring 31 can drive the variable lever arm 10 to rotate and reset during the leg retraction phase, preparing the mechanism for the next extension stroke.

[0035] The lever-operated handle assembly includes a rotating flip rod 12 located at the top of the fixed base 13. An inner limiting block 14 is fixedly connected to the inner side of the top of the fixed base 13. A grip handle 17 is fixedly connected to one side of the top of the flip rod 12. An anti-slip rubber sleeve is fixedly connected to the outside of the grip handle 17. The lever-operated handle assembly also includes a plug-in block 16 fixed inside the flip rod 12. A slot is opened inside the inner limiting block 14. The outside of the plug-in block 16 is nested inside the slot. A 15 is inserted inside the inner limiting block 14, and the outside of the 15 also penetrates the inside of the plug-in block 16. (The last sentence appears to be incomplete and possibly refers to a pull-up frame 2.) A traction plate 24 is fixedly connected to the inside of the 7. The traction plate 24 has multiple external slots 26 inside. An internal slot 33 is opened in the middle of the right side of the configuration block 30. The internal slots 33 are opposite to the external slots 26. A pin 25 is inserted inside the external slot 26, and the outside of the pin 25 is inserted inside the internal slot 33. A protective rubber pad 32 is fixedly connected to the top right side of the bottom plate 1. The configuration block 30 is located at the top of the protective rubber pad 32. Shoulder support arc plates 6 are fixedly connected to both sides of the top left side of the inclined reclining plate 4 to provide shoulder support for the user.

[0036] When adjusting the load, align the outer slot 26 of the inner traction plate 24 of the upper pull frame 27 with the inner slot 33 of the configuration block 30, and then insert the pin 25. This allows you to select the number of configuration blocks 30 that rise and fall synchronously with the upper pull frame 27, thereby achieving graded adjustment of the training load. Throughout the entire lifting stroke of the upper pull frame 27, the support plates 18 on both sides inside the support frame 3 are connected to the upper pull frame 27 via compression springs 22 and damping rods 23, and the pull rope 19 passes through the support plates 18. The compression springs 22 and damping rods 23 work together to constrain the trajectory of the lifting motion of the upper pull frame 27, suppressing the shaking and impact of the configuration blocks 30 during operation. When the configuration blocks 30 fall back, they are cushioned by the protective rubber pads 32 on the bottom plate 1.

[0037] During training, the trainee can operate the lever arm assembly to maintain upper body stability and achieve coordinated force exertion. After the rotating rod 12 of this assembly rotates around the fixed base 13 to a suitable angle, the plug block 16 on the rotating rod 12 is inserted into the slot of the inner limit block 14, and then the position is locked by the pin 15. The trainee can then hold the grip handle 17 with the anti-slip rubber sleeve for leverage. When the equipment is running, it cycles through a series of movements, including pushing off, changing the lever arm to drive the counterweight to lift, and retracting the leg to return smoothly to the starting position, thereby conducting continuous training of lower limb explosive power.

[0038] Working principle section:

[0039] The working principle of this embodiment is as follows: During training, the trainee lies supine on an inclined reclining board with their shoulders against the shoulder support arc plate. They push the foot-push plate with both feet, causing it to slide forward along the connecting frame via the lower extension plate. The foot-push plate then pushes the variable-force arm that is in contact with it. The variable-force arm rotates around the support column inside the connecting seat, and its right end pulls the pull rope via a rotating sleeve. The pull rope reverses direction along the traction roller on the fixed column and pulls the upper pull frame upwards, causing the upper pull frame and the selected configuration block to rise together. This converts the weight of the configuration block into a counter-load for the lower limb extension. As the variable-force arm rotates, the lever arm of the foot-push plate and the pull rope relative to the support column changes continuously with the extension angle, thus changing the load resistance. This matches the force curve of the lower limb explosive power. The upper limit block on the foot-push plate limits the variable-force arm outwards, and the torsion spring inside the limit ring drives the variable-force arm to rotate back when the legs are retracted, resetting for the next push.

[0040] During adjustment, align the outer slot on the inner traction plate of the upper pull frame with the inner slot of the configuration block and insert the pin to select the number of configuration blocks that rise and fall with the upper pull frame, thus achieving graded load adjustment. Throughout the entire process of raising and lowering the upper pull frame, the support plates on both sides of the support frame are connected to the upper pull frame via compression springs and damping rods. The pull rope passes through the support plates, and the compression springs and damping rods together constrain the rising and falling trajectory of the upper pull frame, suppressing the shaking and impact of the configuration blocks. When falling back, the protective rubber pad on the bottom plate cushions the impact. Trainees can also grip the lever assembly to maintain upper body stability and coordinate force exertion. After the flipping rod in this assembly rotates around the fixed seat to a suitable angle, its plug-in block is inserted into the slot of the inner limit block and locked by the pin, allowing the trainee to use the grip handle with anti-slip rubber sleeve for leverage. This cycle of pushing off, changing the lever arm to lift the counterweight, and retracting the leg to return smoothly completes continuous training of lower limb explosive power.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lower limb explosive power training device with a variable lever arm linkage, characterized in that, The system includes a bottom plate (1) for support, a support base (2) fixedly connected to the top of the bottom plate (1), an inclined reclining plate (4) fixedly connected to the top of the support base (2), connecting frames (5) fixedly connected to both sides of the top right of the inclined reclining plate (4), a foot push plate (7) slidably connected inside the connecting frame (5), a lower extension plate (28) fixedly connected to both sides of the bottom end of the foot push plate (7), a connecting seat (11) fixedly connected to the top of the connecting frame (5), and a variable lever arm connecting rod installed inside the connecting seat (11). The bottom plate (1) is fixedly connected to a support frame (3) on the top right side. The support frame (3) is provided with an upper pull frame (27) on the lower side inside. Multiple configuration blocks (30) are stacked inside the upper pull frame (27). The front middle of the configuration block (30) is slidably connected to the middle of the support frame (3). A stable push-pull assembly is installed inside the support frame (3). Fixed seats (13) are fixedly connected to both sides of the inclined reclining plate (4). A lever handle assembly is installed at the top of the fixed seat (13) to enable the lever to generate force from the legs.

2. The lower limb explosive power training device with variable lever arm linkage according to claim 1, characterized in that, The lever handle assembly includes a rotating flip rod (12) located at the top of the fixed base (13). An inner limit block (14) is fixedly connected to the inner side of the top of the fixed base (13). A grip handle (17) is fixedly connected to one side of the top of the flip rod (12). An anti-slip rubber sleeve is fixedly connected to the outside of the grip handle (17).

3. The lower limb explosive power training device with variable lever arm linkage according to claim 2, characterized in that, The lever handle assembly also includes a plug-in block (16) fixed inside the flip rod (12). The inner limit block (14) has a slot inside, and the outside of the plug-in block (16) is nested inside the slot. The inside of the inner limit block (14) is interspersed with (15), and the outside of (15) also penetrates the inside of the plug-in block (16).

4. The lower limb explosive power training device with a variable lever arm linkage according to claim 1, characterized in that, The variable force linkage assembly includes a support column (9) fixed inside the connecting seat (11). Variable force arms (10) are rotatably connected to both sides of the support column (9). The left side of the variable force arm (10) is attached to the right side of the foot push plate (7). Multiple limiting rings (31) are fixedly connected to both sides of the support column (9). The inner side of the limiting rings (31) is connected to the inside of the variable force arm (10) through a torsion spring (29). A rotating sleeve is rotatably connected to the right side of the variable force arm (10). A pull rope (19) is fixedly connected to the outside of the rotating sleeve. The bottom end of the pull rope (19) is fixedly connected to the top of the upper pull frame (27).

5. The lower limb explosive power training device with a variable lever arm linkage according to claim 4, characterized in that, The stable push-pull assembly includes a support plate (18) fixed on both sides inside the support frame (3). The bottom end of the support plate (18) is connected to the top end of the upper pull frame (27) through a compression spring (22). A damping rod (23) is fixedly connected to the bottom inner side of the support plate (18). The bottom end of the damping rod (23) is fixedly connected to the top end of the upper pull frame (27). The outside of the pull rope (19) passes through the inside of the support plate (18).

6. The lower limb explosive power training device with a variable lever arm linkage according to claim 4, characterized in that, The upper inner side of the support frame (3) is fixedly connected to a fixed column (21), and the outer sides of the fixed column (21) are rotatably connected to traction rollers (20). The outer side of the pull rope (19) abuts against the inside of the traction roller (20).

7. The lower limb explosive power training device with a variable lever arm linkage according to claim 1, characterized in that, Multiple upper limit blocks (8) are fixedly connected to the upper right side of the foot push plate (7) to achieve the outward limit of the variable lever arm (10).

8. The lower limb explosive power training device with variable lever arm linkage according to claim 1, characterized in that, The inner side of the pull-up frame (27) is fixedly connected to a traction plate (24). The traction plate (24) has multiple external slots (26) inside. The right middle part of the configuration block (30) has an internal slot (33). The internal slots (33) are opposite to the external slots (26). The external slots (26) have pins (25) inserted inside, and the outside of the pins (25) is inserted inside the internal slots (33).

9. A lower limb explosive power training device with a variable lever arm linkage according to claim 1, characterized in that, A protective rubber pad (32) is fixedly connected to the top right side of the bottom plate (1), and the configuration block (30) is located at the top of the protective rubber pad (32).

10. A lower limb explosive power training device with a variable lever arm linkage according to claim 1, characterized in that, The top left side of the inclined reclining board (4) is fixedly connected to shoulder support arc plates (6) to provide shoulder support for the user.

Images