Resistance adjustment device for seated strength training
By working in concert with the power storage component, clutch component, and adjustment component, the shortcomings of resistance adjustment in traditional seated strength training equipment are solved, realizing automated eccentric overload training, improving training efficiency and safety, and meeting the personalized needs of different trainees.
Patent Information
- Application Number
- CN202610824743.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-09
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional seated strength training equipment makes it difficult to achieve safe, precise, and rapid resistance adjustment, especially lacking independent control during the eccentric contraction phase. Furthermore, manually adding or removing weights is cumbersome and cannot meet the personalized needs of different trainees.
By employing the coordinated operation of a power storage component, a clutch component, and an adjustment component, mechanical energy is stored during the centrifugal phase through automatic locking and unlocking functions, and additional resistance is applied during the centrifugal phase. Combined with a turntable and an adjusting screw, a wide range and high precision adjustment of the resistance are achieved.
It achieves automated centrifugal overload training, improves training efficiency and safety, meets the personalized needs of different trainees, and has a compact structure and is easy to operate.
Smart Images
Figure CN122377096A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of fitness equipment technology, and in particular to a resistance adjustment device for seated strength training. Background Technology
[0002] As a core component of physical training, the effectiveness of strength training largely depends on the characteristics of the resistance applied during training and how it is adjusted. Traditional strength training equipment, especially seated trainers based on pulleys and weights, usually changes the resistance by directly increasing or decreasing the number of weights. While this method can provide a stable load during the concentric contraction (active muscle shortening) phase, the resistance often remains unchanged or lacks an independent, targeted control mechanism during the critical eccentric contraction (passive muscle lengthening) phase.
[0003] Eccentric overload training is a highly efficient training method. Its principle lies in applying a load higher than the muscle's concentric contraction capacity during the eccentric contraction phase. Studies have shown that this training method can more effectively stimulate muscle growth, enhance strength and explosiveness, and may bring unique neuroadaptive benefits. However, there are significant bottlenecks in achieving safe, effective, and precisely controllable eccentric overload on traditional equipment. First, manually adding or removing weights is cumbersome and time-consuming, making it difficult to quickly switch resistance between single training sessions or continuous movements. Second, traditional structures usually cannot automatically trigger additional resistance increments independent of the concentric phase at specific points in the movement cycle (such as when the weight plate is raised to its highest point) to achieve precise control of power accumulation and release. Finally, the range and precision of resistance adjustment are limited, making it difficult to meet the needs of different trainees or different stages for fine-tuning of eccentric load. Summary of the Invention
[0004] One objective of this invention is to provide a resistance adjustment device for seated strength training. This invention aims to overcome the above-mentioned deficiencies and provide a seated strength training resistance adjustment device that is compact in structure, easy to adjust, and capable of intelligently matching the training movement cycle, so as to optimize the eccentric overload training experience and improve training efficiency and safety.
[0005] According to an embodiment of the present invention, a resistance adjustment device for seated strength training includes a base and a pulley-type trainer adapted to the base. A counterweight plate is longitudinally slidably installed on the counterweight end of the pulley-type trainer. The base is located directly above the counterweight plate. Three first slide rails are vertically fixedly installed on the base. A lead screw is rotatably installed in the middle first slide rail. A friction coupling plate is fixedly installed at one end of the lead screw. The device also includes a power storage component, a clutch component, and an adjustment component fixedly installed on the base. The power storage component has automatic locking and unlocking functions. It stores power when the counterweight plate rises and unlocks when the counterweight plate reaches its highest point to apply pressure during the centrifugal training phase. The power storage component includes two first sliders and one second slider, each with a first slide block mounted on its back. The first slider and the second slider are slidably mounted on the first slide rail via the first slide block. The second slider is positioned between the two second sliders. A push rod pointing towards the second slider is fixedly mounted on the top of the counterweight plate. A first push rod is longitudinally fixedly inserted into the first slider. A spring clip is movably inserted into the first slider, and the spring clip has a protrusion. A lever is fixedly mounted on both sides of the second slider. The power storage component also includes two guide seats fixedly mounted on the base. The guide seats are positioned between two adjacent first slide rails. The clutch assembly is used for switching the drive between the power storage assembly and the adjustment assembly; The adjustment component is used to adjust the force storage force. The adjustment component includes a turntable rotatably mounted on a base. Multiple sets of sliding rods are fixedly mounted in a circular array on the turntable, and a fixed plate is fixedly mounted on the other end of one set of sliding rods. Two sliding discs are also slidably mounted on the sliding rods. A second push rod is fixedly mounted on one of the sliding discs. The second push rod is movably inserted into the fixed plate. A force storage spring is fixedly mounted between the two sliding discs.
[0006] Preferably, both the spring pin and the guide seat are wedge-shaped with opposite inclined surfaces. The guide seat has a slot for the spring pin to pass through. The spring pin and the lever are in the same plane. The inclined surface of the guide seat and the protrusion on the spring pin are in the same plane.
[0007] Preferably, a blocking plate for blocking the first slider is fixedly installed on the base, a contact head is threadedly installed at the bottom of the first push rod, and an extension rod is fixedly installed at the top of the first push rod.
[0008] Preferably, a second slide rail is also installed between the second slider and the first slide block, and the second slider can slide within a small range on the second slide rail.
[0009] Preferably, a distance sensor is fixedly mounted on the top of the second slider and a matching reflector is fixedly mounted on the base.
[0010] Preferably, the clutch assembly includes a splined rod, a drive gear, and a shift fork. The splined rod is splined and mounted on the base along the axis of the lead screw. Friction coupling discs are fixedly mounted at both ends of the splined rod. Two gears are symmetrically fixedly mounted on the splined rod. The drive gear is rotatably mounted on the base, and its axis is perpendicular to the axis of the splined rod in a plane. The distance between the two gears is smaller than the diameter of the drive gear. The shift fork is slidably mounted on the base and is engaged in the middle of the splined rod. The shift fork reciprocates and slides to change the meshing state of the two gears and the coupling state of the coupling friction discs.
[0011] Preferably, an adjusting screw threadedly connected to the turntable is rotatably mounted on another slide. Rotating the adjusting screw adjusts the compression of the storage spring to achieve a small range of adjustment of the storage force. The slide has graduation lines, and a blocking ring is fixedly mounted on the base to block the thrust of the second push rod without interfering with the rotation of the turntable. The blocking ring has two through holes corresponding to the pressure point in the storage assembly for the passage of the second push rod. Rotating the turntable switches storage springs with different elastic forces to achieve a large range of adjustment of the storage force.
[0012] Preferably, the adjustment assembly further includes an indexing seat fixedly installed on the base, on which an indexing disk and a transmission disk that drive each other are rotatably installed. The shaft of the indexing disk is fixedly connected to the turntable, and the shaft of the transmission disk is fixedly installed with a friction coupling disk.
[0013] Preferably, the indexing seat is provided with two mutually movable chucks, one of which is fixedly connected to the shaft of the indexing plate, and the other chuck is splined on the indexing seat and a spring is provided between it and the indexing seat. The number of teeth on the two chucks is a multiple of the number of the second push rod to prevent the turntable from spinning idly and misaligning.
[0014] The beneficial effects of this invention are: This invention achieves automated centrifugal overload pressure application. The energy storage component automatically stores mechanical energy during the concentric training phase and automatically unlocks when the counterweight plate reaches its apex (the key node for transitioning from concentric to centrifugal). The stored energy is then precisely applied as additional resistance during the centrifugal phase without manual intervention, resulting in a smooth and efficient training process. It provides wide-range, high-precision resistance adjustment. The adjustment component uses a turntable to switch between different energy storage springs to achieve a wide range of coarse resistance adjustments. Combined with the fine-tuning of the pre-compression of individual springs using the adjustment screw, it can meet the precise needs of athletes from beginners to advanced levels for different centrifugal load intensities. It also improves equipment integration and ease of operation. The clutch component intelligently switches the drive source, allowing the same motor to be used for both resetting the energy storage component and selecting the adjustment component, resulting in a compact structure. Attached Figure Description
[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the installation of a resistance adjustment device for seated strength training proposed in this invention. Figure 2 This is a schematic diagram of the counterweight plate adapted in a resistance adjustment device for seated strength training proposed in this invention.
[0016] Figure 3 This is a schematic diagram of the overall structure of a resistance adjustment device for seated strength training proposed in this invention.
[0017] Figure 4 This is a schematic diagram of the base structure in a resistance adjustment device for seated strength training proposed in this invention.
[0018] Figure 5 This is a schematic diagram of the force storage component in a resistance adjustment device for seated strength training proposed in this invention.
[0019] Figure 6 This is a schematic diagram of the installation of the second slider in a resistance adjustment device for seated strength training proposed in this invention.
[0020] Figure 7 This is a schematic diagram of the guide seat in a resistance adjustment device for seated strength training proposed in this invention.
[0021] Figure 8 This is a schematic diagram of the clutch assembly in a resistance adjustment device for seated strength training proposed in this invention.
[0022] Figure 9 This is a schematic diagram of the adjustment component in a resistance adjustment device for seated strength training proposed in this invention.
[0023] Figure 10 This is a schematic diagram of the indexing seat in a resistance adjustment device for seated strength training proposed in this invention.
[0024] In the picture: 1. Pulley-type training device; 2. Counterweight plate; 201. Top rod; 3. Base; 301. First slide rail; 302. Baffle plate; 303. Lead screw; 304. Baffle ring; 4. Power storage assembly; 401. First slider; 402. Second slider; 403. Guide seat; 404. First slide block; 405. First push rod; 406. Contact head; 407. Spring pin; 408. Second slide rail; 409. Lever; 410. Distance sensor; 5. Clutch assembly; 501. Splined rod; 502. Drive gear; 503. Shift fork; 504. Gear; 6. Adjustment components; 601. Turntable; 602. Fixed plate; 603. Slide plate; 604. Second push rod; 605. Storage spring; 606. Adjustment screw; 607. Indexing seat; 608. Indexing plate; 609. Transmission plate; 610. Chuck. Detailed Implementation
[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.
[0026] refer to Figures 1-10 This invention discloses a resistance adjustment device for seated strength training, with reference to... Figure 1 This includes a base 3 and a pulley-type training device 1 adapted to and mounted on the base 3, see reference. Figure 2 The counterweight plate 2 is longitudinally slidably mounted on the counterweight end of the pulley-type training device 1, and the base 3 is positioned directly above the counterweight plate 2. (See reference) Figure 1 and Figure 4 Three first slide rails 301 are vertically fixed on the base 3. A lead screw 303 is rotatably installed in the middle first slide rail 301. A friction coupling disk is fixedly installed at one end of the lead screw 303. The base 3 also includes a power storage component 4, a clutch component 5 and an adjustment component 6, which are fixedly installed on the base 3. The power storage component 4 has automatic locking and unlocking functions. It stores power when the counterweight plate 2 rises. When the counterweight plate 2 rises to the highest point, the power storage component 4 unlocks to apply pressure during the centrifugal training phase. The clutch component 5 is used to switch the drive between the power storage component 4 and the adjustment component 6. The adjustment component 6 is used to adjust the power storage force. The core of this device is the integration of three cooperating components: the energy storage component 4, the clutch component 5, and the adjustment component 6. The collaborative workflow of these three components is as follows: before training, the clutch component 5 drives the adjustment component 6 to set the target resistance. During training, the energy storage component 4 automatically stores energy during the centrifugal phase. At the critical node where the centrifugal phase transitions to the eccentric phase, the energy storage component 4 unlocks and applies the stored energy to the trainee through the counterweight plate 2. This generates an additional resistance that is independent of the original counterweight and whose magnitude is adjustable during the eccentric phase, thus achieving safe and precise eccentric overload training.
[0027] refer to Figures 5-7The power storage assembly 4 includes two first sliders 401 and one second slider 402, each with a first slide block 404 mounted on its back. Both the first sliders 401 and 402 are slidably mounted on the first slide rail 301 via the first slide blocks 404. The second slider 402 is positioned between the two second sliders 402. A push rod 201 pointing towards the second slider 402 is fixedly mounted on the top of the counterweight plate 2. A first push rod 405 is longitudinally fixedly inserted into the first slider 401. A spring clip 407 is movably inserted into the first slider 401, and a spring... The locking pin 407 is provided with a protruding post, and the second slider 402 is fixedly installed with levers 409 on both sides. The power storage assembly 4 also includes two guide seats 403 fixedly installed on the base 3. The guide seats 403 are located between two adjacent first slide rails 301. The spring locking pin 407 and the guide seats 403 are both wedge-shaped and have opposite slopes. The guide seats 403 have slots for the spring locking pin 407 to pass through. The spring locking pin 407 and the levers 409 are in the same plane, and the slope of the guide seats 403 and the protruding post on the spring locking pin 407 are in the same plane. During the energy storage phase, the motor drives the second slider 402 to rise along the first slide rail 301 via the lead screw 303. The second slider 402 pushes the two first sliders 401 to rise synchronously via the levers 409 on both sides (the levers 409 are in planar contact with the spring clips 407). The first push rod 405 rises accordingly and compresses the upper adjustment component 6 (specifically the energy storage spring 605). After reaching a certain height, the mechanical energy storage (energy storage) is completed. During training, the counterweight plate 2 drives the push rod 201 to rise. After the push rod 201 contacts the second slider 402, it rises. Since the protrusion on the spring pin 407 contacts the inclined surface of the guide seat 403, when the first slider 401 continues to rise, the spring pin 407 is pressed back until the lever 409 disengages from the spring pin 407. The first slider 401 is no longer constrained by the second slider 402. At this time, the centrifugal training pressure stage begins. During centripetal training, the motor drives the second slider 402 to descend together with the first slider 401 (first push rod 405), but they will maintain a certain distance. After the centripetal training is completed (after the first slider 401 reaches the bottom), the second slider 402 continues to descend. At this time, the lever 409 contacts the inclined surface of the spring latch 407. As the second slider 402 descends, the spring latch 407 is compressed again until it disengages from the lever 409. At this time, the lever 409 contacts the plane of the spring latch 407 again, and the above-mentioned power storage phase can be repeated to complete multiple centripetal training sessions.
[0028] A blocking plate 302 for blocking the first slider 401 is fixedly installed on the base 3, a contact head 406 is threadedly installed at the bottom of the first push rod 405, and an extension rod is fixedly installed at the top of the first push rod 405. Among them, the baffle plate 302 is used to limit the extreme position of the first slider 401 downward movement, ensuring that it moves within the designed stroke and is coordinated with the trigger position of other components. The contact head 406 can be finely adjusted up and down through the threaded connection, which is used to accurately calibrate the contact accuracy between the first push rod 405 and the second push rod 604 in the adjustment assembly 6. The extension rod ensures that even if the first slider 401 is in a high position in the power storage state, its thrust can be transmitted downward through the sufficiently long extension rod. refer to Figure 6 The second slider 402 is fixedly mounted with a distance sensor 410 on its top and a matching reflector is fixedly mounted on the base 3. A second slide rail 408 is also installed between the second slider 402 and the first slide block 404. The second slider 402 can slide on the second slide rail 408 in a small range. Its function can be seen in the above-mentioned power storage stage. The distance sensor 410 is used to monitor the position of the second slider 402 in real time to ensure the accuracy of the power storage transmission and to establish a base data signal for the subsequent electrical signal transmission.
[0029] refer to Figure 8 The clutch assembly 5 includes a splined rod 501, a drive gear 502, and a shift fork 503. The splined rod 501 is splinedly mounted on the base 3 along the axis of the lead screw 303. Friction coupling discs are fixedly mounted at both ends of the splined rod 501. Two gears 504 are symmetrically fixedly mounted on the splined rod 501. The drive gear 502 is rotatably mounted on the base 3, and its axis is perpendicular to the axis of the splined rod 501 in a plane. The distance between the two gears 504 is smaller than the diameter of the drive gear 502. A servo motor and a servo motor for driving the gear and the shift fork 503 are fixedly mounted on the base 3, respectively. The shift fork 503 is slidably mounted on the base 3 and is snapped into the middle of the splined rod 501. The shift fork 503 reciprocates to change the meshing state of the two gears 504 and the coupling state of the coupling friction discs. When the shift fork 503 is driven to slide to one side, it will cause the spline rod 501 to move axially. This movement can achieve two states: one is to make one of the gears 504 on the spline rod 501 mesh with the drive gear 502, while the other is disengaged; the other is to simultaneously make the friction coupling disc at one end of the spline rod 501 press-coupled with the friction coupling disc at the end of the lead screw 303, while the friction coupling disc at the other end is disengaged from the friction coupling disc on the shaft of the transmission disc 609 of the adjusting component 6 (or vice versa). The drive gear 502 can be driven by a servo motor. When the spline rod 501 moves to the left, its left-end gear 504 meshes with the drive gear 502, and at the same time, the left-end friction... When the friction disc of the friction plate is coupled with the friction disc of the lead screw 303, the servo motor drives the lead screw 303 to rotate through the gear 504 transmission and friction coupling. The rotation of the lead screw 303 can drive the components connected to it through the threaded pair to move up and down, thereby adjusting the initial height of the power storage component 4 or providing auxiliary driving force. When it is necessary to drive the adjustment component 6 to switch the power storage spring 605, the shift fork 503 drives the spline rod 501 to move to the right, so that its right end gear 504 meshes with the active gear plate 502. At the same time, the right end friction disc is coupled with the friction disc on the shaft of the transmission plate 609. Then the servo motor drives the transmission plate 609 to rotate, and then drives the turntable 601 to rotate through the indexing plate 608.
[0030] refer to Figure 9 The adjusting assembly 6 includes a turntable 601 rotatably mounted on the base 3. Multiple sets of sliding rods are fixedly mounted in a circular array on the turntable 601, with a fixed plate 602 fixedly mounted at the other end of each set of sliding rods. Two sliding discs 603 are also slidably mounted on the sliding rods. A second push rod 604 is fixedly mounted on one of the sliding discs 603 and is movably inserted into the fixed plate 602. A storage spring 605 is fixedly mounted between the two sliding discs 603. An adjusting screw threadedly connected to the turntable 601 is rotatably mounted on the other sliding disc 603. 606. Rotate the adjusting screw 606 to adjust the compression of the storage spring 605 to achieve the purpose of adjusting the storage force within a small range. The slide bar is engraved with scale lines. A blocking ring 304 is fixedly installed on the base 3 to block the thrust of the second push rod 604 without interfering with the rotation of the turntable 601. The blocking ring 304 has two through holes corresponding to the pressure point in the storage component 4 for the second push rod 604 to pass through. Rotate the turntable 601 to switch storage springs 605 with different elastic forces to achieve the purpose of adjusting the storage force within a large range. Each set of sliding rods, fixed plate 602, two sliding plates 603, energy storage spring 605, and second push rod 604 constitutes an independent energy storage unit. All energy storage units are arranged in a circular array on the turntable 601. During operation, the second push rod 604 of one energy storage unit is directly opposite the pressure application position of the energy storage component 4 (i.e., above the extension rod of the first push rod 405). When the energy storage spring 605 of this energy storage unit is compressed, its elastic force is stored through the second push rod 604 and ready to be released by rotating the adjusting screw 60. 6. The sliding plate 603 connected to it can be pushed to slide along the sliding rod, thereby changing the distance between the two sliding plates 603, and thus precisely adjusting the pre-compression amount (initial force) of the energy storage spring 605 in the energy storage unit, realizing small-range, continuous fine adjustment of the energy storage force. The scale lines on the sliding rod are easy to observe and repeatedly set the compression amount. When a large change in energy storage force is required, the turntable 601 needs to be rotated to rotate the energy storage units with different stiffness or different pre-compression amounts (which can be set in advance) to the working position. The blocking ring 304 is fixed on the base 3. Its inner ring diameter allows the turntable 601 to rotate freely. The blocking ring 304 has two through holes. One through hole is located directly above the pressure point of the second push rod 604 in the energy storage assembly 4, allowing the working second push rod 604 to pass through and apply pressure to the first push rod 405 below. The other through hole may be used for the adjustment operation of the adjusting screw 606 or as an observation port. When the energy storage spring 605 is released, the second push rod 604 is pressed down, and its thrust is transmitted. refer to Figure 10 The adjustment assembly 6 also includes an indexing seat 607 fixedly installed on the base 3. An indexing plate 608 and a transmission plate 609 that are mutually driven are rotatably installed on the indexing seat 607. The number and position of the indexing plate 608 correspond to the second push rod 604. The shaft of the indexing plate 608 is fixedly connected to the turntable 601. A friction coupling plate is fixedly installed on the shaft of the transmission plate 609. Among them, the friction coupling disk at the shaft end of the transmission disk 609 is used to couple with the friction coupling disk at the corresponding end of the spline rod 501 of the clutch assembly 5 to receive driving force. The outer periphery of the indexing disk 608 has an indexing and positioning structure corresponding to the number of power storage units on the turntable 601, ensuring that the second push rod 604 of a power storage unit can be accurately aligned with the working through hole every time the turntable 601 rotates by an angle. The indexing seat 607 provides support for the entire indexing and positioning mechanism. The indexing seat 607 is provided with two mutually movable chucks 610. One chuck 610 is fixedly connected to the shaft of the indexing plate 608, and the other chuck 610 is splined on the indexing seat 607 and a spring is provided between the chuck 610 and the indexing seat 607. The number of teeth on the two chucks 610 is a multiple of the number of teeth on the second push rod 604 to prevent the turntable 601 from spinning idly and misaligning. Since the number of teeth is a multiple of the number of the second push rod 604 (for example, if there are 8 power storage units, the number of teeth is 16 or 24), it ensures that each indexing rotation can accurately position one power storage unit to the working position, while avoiding inaccurate positioning or "idling" caused by gear 504 backlash or transmission error, thus ensuring the alignment accuracy of the second push rod 604 with the working through hole.
[0031] Working principle: Before training, the clutch assembly 5 switches the drive to the adjustment assembly 6, rotates the turntable 601 to select the energy storage unit with the corresponding energy storage spring 605, and fine-tunes the pre-compression of the spring by adjusting the screw 606, thereby setting the target additional resistance. During training, the clutch assembly 5 switches the drive to the lead screw 303, and the motor drives the second slider 402 of the energy storage assembly 4 to rise synchronously with the first slider 401 through the lead screw 303. The first push rod 405 compresses the energy storage spring 605 in the working position, completing the storage of mechanical energy (energy storage). The spring catch 407 cooperates with the lever 409 to make the first slider 402... 01 After reaching the predetermined height, it locks. When the counterweight plate 2 rises to the highest point in the centrifugal stage, its push rod 201 pushes the second slider 402 to continue moving upward, forcing the spring latch 407 to disengage from the lever 409, and the first slider 401 is unlocked. In the subsequent centrifugal stage, the compressed storage spring 605 applies downward pressure through the second push rod 604 and the first push rod 405, converting the stored energy into additional resistance applied to the counterweight plate 2, achieving centrifugal overload. After centrifugation, the motor drives the second slider 402 to move downward, and re-engages the first slider 401 through the inclined plane action. The device resets and prepares for the next cycle.
[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A resistance adjustment device for seated strength training, characterized in that, The equipment includes a base (3) and a pulley-type trainer (1) adapted to the base (3). The pulley-type trainer (1) has a counterweight plate (2) slidably mounted on the counterweight end. The base (3) is located directly above the counterweight plate (2). Three first slide rails (301) are vertically fixed on the base (3). A lead screw (303) is rotatably mounted in the middle first slide rail (301). A friction coupling plate is fixedly mounted on one end of the lead screw (303). The equipment also includes a power storage component (4), a clutch component (5), and an adjustment component (6) fixedly mounted on the base (3). The power storage component (4) has automatic locking and unlocking functions. It stores power when the counterweight plate (2) rises and unlocks when the counterweight plate (2) reaches its highest point to apply pressure during the eccentric training phase. The power storage component (4) includes two first sliders (401) and one second slider (402), and each has a first slide block (404) mounted on its back. The first sliders (401) and one second slider (402) are slidably mounted on the first slide rail (301) via the first slide block (404). The second slider (402) is located on the two second sliders (402). Between the two slide rails (301), a top rod (201) pointing to the second slide rail (402) is fixedly installed on the top of the counterweight plate (2). A first push rod (405) is fixedly inserted longitudinally on the first slide rail (401). A spring pin (407) is movably inserted on the first slide rail (401) and a protrusion is provided on the spring pin (407). A lever (409) is fixedly installed on both sides of the second slide rail (402). The power storage component also includes two guide seats (403) fixedly installed on the base (3). The guide seats (403) are located between two adjacent first slide rails (301). The clutch assembly (5) is used for driving switching between the power storage assembly (4) and the regulating assembly (6); The adjustment component (6) is used to adjust the force storage. The adjustment component (6) includes a turntable (601) rotatably mounted on the base (3). Multiple sets of sliding rods are fixedly mounted in a circular array on the turntable (601), and a fixed plate (602) is fixedly mounted on the other end of one set of sliding rods. Two sliding discs (603) are also slidably mounted on the sliding rods. A second push rod (604) is fixedly mounted on one of the sliding discs (603). The second push rod (604) is movably inserted into the fixed plate (602). A force storage spring (605) is fixedly mounted between the two sliding discs (603).
2. The resistance adjustment device for seated strength training according to claim 1, characterized in that, The spring pin (407) and the guide seat (403) are both wedge-shaped with opposite inclined surfaces. The guide seat (403) has a slot for the spring pin to pass through. The spring pin (407) and the lever (409) are in the same plane. The inclined surface of the guide seat (403) and the protrusion on the spring pin (407) are in the same plane.
3. The resistance adjustment device for seated strength training according to claim 1, characterized in that, A blocking plate (302) for blocking the first slider (401) is fixedly installed on the base (3), a contact head (406) is threaded on the bottom of the first push rod (405), and an extension rod is fixedly installed on the top of the first push rod (405).
4. The resistance adjustment device for seated strength training according to claim 3, characterized in that, A second slide rail (408) is also installed between the second slider (402) and the first slide block (404), and the second slider (402) can slide within a small range on the second slide rail (408).
5. The resistance adjustment device for seated strength training according to claim 4, characterized in that, The second slider (402) has a distance sensor (410) fixedly installed on its top and a matching reflector fixedly installed on its base (3).
6. The resistance adjustment device for seated strength training according to claim 1, characterized in that, The clutch assembly (5) includes a spline rod (501), a drive gear (502), and a shift fork (503). The spline rod (501) is splined and mounted on the base (3) along the axis of the lead screw (303). Friction coupling discs are fixedly mounted at both ends of the spline rod (501). Two gears (504) are symmetrically fixedly mounted on the spline rod (501). The drive gear (502) is rotatably mounted on the base (3) and its axis is perpendicular to the axis of the spline rod (501) in a plane. The distance between the two gears (504) is smaller than the diameter of the drive gear (502). The shift fork (503) is slidably mounted on the base (3) and is engaged in the middle of the spline rod (501). The shift fork (503) reciprocates and slides to change the meshing state of the two gears (504) and the coupling state of the coupling friction disc.
7. The resistance adjustment device for seated strength training according to claim 1, characterized in that, Another slide (603) is rotatably mounted with an adjusting screw (606) threadedly connected to the turntable (601). Rotating the adjusting screw (606) adjusts the compression of the energy storage spring (605) to achieve a small range of adjustment of the energy storage force. The slide is engraved with scale lines. A blocking ring (304) is fixedly mounted on the base (3) to block the thrust of the second push rod (604) without interfering with the rotation of the turntable (601). The blocking ring (304) has two through holes for the second push rod (604) to pass through at the pressure point in the energy storage assembly (4). The turntable (601) rotates to switch energy storage springs (605) with different elastic forces to achieve a large range of adjustment of the energy storage force.
8. The resistance adjustment device for seated strength training according to claim 7, characterized in that, The adjustment assembly (6) further includes an indexing seat (607) fixedly installed on the base (3). An indexing disk (608) and a transmission disk (609) that drive each other are rotatably installed on the indexing seat (607). The shaft of the indexing disk (608) is fixedly connected to the turntable (601), and a friction coupling disk is fixedly installed on the shaft of the transmission disk (609).
9. A resistance adjustment device for seated strength training according to claim 8, characterized in that, The indexing seat (607) is provided with two mutually movable chucks (610). One of the chucks (610) is fixedly connected to the shaft of the indexing plate (608), and the other chuck (610) is splined on the indexing seat (607) and a spring is provided between the chuck and the indexing seat (607). The number of teeth on the two chucks (610) is a multiple of the number of the second push rod (604) to prevent the turntable (601) from spinning idly and misaligning.