Adjustable leg training device

Abstract

This invention discloses an adjustable leg training device comprising a frame (1), a pedal (5), a chassis (4), a pedal support, and a seat (10). The pedal support includes the coupling arm (2) and the mounting bracket (3). The lower end of the chassis (4) is articulated with the frame (1), and its upper end is articulated with the front end of the coupling arm (2). The rear end of the coupling arm (2) is attached to the lower end of the mounting bracket (3) and articulated with the frame (1). This invention can improve the effectiveness and comfort of the workout. (Figure for abbreviation: Fig. 1)

Description

Title of the invention: Adjustable leg training device technical field

[0001] The present invention relates to the technical field of fitness equipment, more specifically an adjustable leg training device. Technical context

[0002] Leg training equipment, a common piece of fitness equipment widely used in fitness environments such as gyms, incorporates exercises targeting leg muscles by primarily simulating the pedaling motion of the lower body. The aim is to tone and strengthen lower body muscle groups, while simultaneously training the lower body to effectively improve the cardiovascular system and increase leg energy and flexibility. Currently, most leg training station configurations lack sufficient flexibility, and the equipment can only adjust the distance between the legs to accommodate the leg lengths of different users. Leg training is often performed in a seated position, such as in a chair.Aside from the distance of the kicks, the angle of support for the user also affects comfort and the effectiveness of the workout. At the same time, the pedal structure of leg trainers typically has significant dead weight, meaning the user will bear the brunt of the pedal structure during leg retraction. Those with lower strength are prone to discomfort from the weight of the pedal structure during leg retraction, which can lead to training difficulties or even injury. Existing leg trainers cannot meet the needs of diverse users; therefore, a leg trainer with greater flexibility and adaptability is in demand. Description of the invention

[0003] In order to resolve the aforementioned problems existing in the technical context, the present invention discloses an adjustable leg training apparatus, comprising a frame, a pedal, a chassis, a pedal support, and a seat. The pedal support comprises the coupling arm and the mounting bracket; the lower end of the chassis is articulated with the frame; the upper end of the chassis is articulated with the front end of the coupling arm; the front end of the coupling arm is connected to the first barbell axle; the rear end of the coupling arm is fixedly connected to the lower end of the mounting bracket; the rear end of the arm The coupling is articulated with the frame; the front side of the upper end of said mounting bracket is connected to said pedal; the second barbell axle is installed on the rear side of the mounting bracket; said seat is installed on the frame by means of a position adjustment mechanism and an angle adjustment mechanism. The adjustment mechanism is fixed to the frame, and the seat is located on the front side of the frame.

[0004] Preferably selective, said position adjustment mechanism comprises a sliding plate and an adjustment plate. Said adjustment plate is fixedly connected to the frame. Several first adjustment holes are arranged in the front and rear directions of the upper edge of the adjustment plate. Said sliding plate is slidably arranged on the frame, the first fixing lock corresponding to the first adjustment hole is placed on the sliding plate, and said seat is arranged on the sliding plate.

[0005] Preferably selective, an adjustment handle is installed on said sliding plate. Said first fixing lock comprises a first fixing shell, a first lock, a first return spring, and a first limiting rod. Said first fixing shell is fixedly connected to the sliding plate connection. The first fixing shell is connected to the sliding plate. Said first lock is slidably arranged within the first fixing shell. The first lock is located at one end of the first fixing shell that approaches the sliding plate. Said first limiting rod is fixed within the first fixing shell. The first limiting rod is located at one end of the first fixing shell that moves away from the sliding plate. One end of said first lock, away from the sliding plate, is provided with a sliding rod.The diameter of said sliding rod is less than those of the first lock and the first limiting rod, the sliding rod passes through the first limiting rod in a sliding manner and extends outwards from the first fixing shell, and said first return spring is disposed between the first limiting rod and the first lock; .

[0006] One end of said adjustment handle is articulated with the sliding plate, the other end of the adjustment handle extends to one side of the seat, and one end of said sliding rod located outside the first fixing shell is connected to the adjustment handle.

[0007] Preferably selective, said seat comprises a seat and a backrest. Said seat is fixedly connected to the sliding plate. The lower end of the backrest is hinged to the sliding plate. Said angle adjustment mechanism comprises an adjustment rod and an adjustment tube; one end of said adjustment tube is hinged to the upper end of the backrest, and the other end of the adjustment tube is slidably fitted onto the outer wall of one end of the adjusting rod; the other end of said adjusting rod is hinged to the sliding plate; several second adjusting holes are arranged along the length of the adjusting rod. The second fixing lock, corresponding to the second adjusting hole, is installed on said adjusting tube.

[0008] Preferably selective, a locking control mechanism is provided on one side of said seat to control the locking / unlocking of the second fixing lock in the second adjustment hole. A first air spring is installed on the rear side of said backrest; one end of said first air spring is articulated with the backrest, and the other end of the first air spring is articulated with the sliding plate.

[0009] Preferably selective, said second fixing lock comprises a second fixing shell, a second lock, a second return spring and a second limiting rod. Said second fixing shell is fixedly connected to the adjusting tube, and the second fixing shell is connected to the adjusting tube, said second lock is slidably disposed in the second fixing shell, the second lock is located at one end of the second fixing shell that approaches the adjusting tube, said second limiting rod is fixed in the second fixing shell, and the second limiting rod is located at one end of the second fixing shell that is away from the adjusting tube, a wiring hole is provided in the second limiting rod, and said second return spring is positioned between the second limiting rod and the second lock;

[0010] Said lock control mechanism comprises a brake cable and a lever. Said lever is hinged to a seat side. One end of said brake cable is connected to the lever, and the other end of the brake cable passes through the wiring hole and the second return spring, and connects to said second lock.

[0011] Preferably selective, a second buffer block is fixed on said sliding plate, and said second buffer block is located on the rear side of the backrest.

[0012] Preferably selective, said chassis is a U-shaped frame, and it has two coupling arms. The two coupling arms are located respectively on the two sides of the seat. The front ends of the two coupling arms are respectively connected to the two vertical rods of the U-shaped frame.

[0013] Preferably selective, it also includes an adjustment arm and an adjustment pull rod. The lower end of said adjustment arm is articulated to the front end of the coupling arm, and the upper end of the adjustment arm is fixed to said first barbell axle. One end of said adjustment pull rod is articulated with the adjustment arm, and the other end of the adjustment pull rod is articulated to the frame.

[0014] Preferably selective, said frame is provided with an adjustable safety mechanism, the adjustable safety mechanism being located below the coupling arm. Said adjustable safety mechanism comprises an adjustment handle, a fixing tube, and a movable rod. Said fixing tube is fixed to the machine, said movable rod is slidably installed within the fixing tube, and both ends of the movable rod extend to the outside of the fixing tube. Several third adjustment holes are arranged along the length of said movable rod, and said fixing tube is provided with a third fixing lock that corresponds to the third adjustment hole. A first buffer block is installed at the upper end of said movable rod, and said adjustment handle is fixed to the lower end of the movable rod.

[0015] The present invention has the following beneficial effects:

[0016] 1. The present invention has an adjustable seat that allows the position to be adjusted and the angle of the backrest, the seat can be adjusted according to the height of the person being trained, leg length, etc., flexible to use, more ergonomic, and able to meet the needs of different people being trained and improve the training effect and training well-being.

[0017] 2. The present invention can mitigate the problem of the self-weight of the pedal part By increasing or decreasing the weight plate on the second barbell axle, the pedal structure returns to its original position, where it begins to fall under its own weight, when the user retracts their legs. The weight plate on the second barbell axle exerts a force on the pedal structure that counteracts its gravity, preventing situations where the user cannot grip the pedals when retracting their legs due to excessive weight. This improves both the training effect and safety. Furthermore, the weight plate on the second barbell axle can be adjusted to suit the intensity of different training programs, thus meeting the needs of a variety of users.

[0018] 3. Given that the legs of the person being trained are bent in the state At the start of training, it is very difficult to stand up at that point. As the legs continue to straighten, the trainee will feel relaxed, making it difficult to straighten the legs and stand up under heavy load, but under light load, they fail to achieve the training effect. The present invention incorporates an adjustment arm and an adjustment pull rod, which can change the moment arm during pedaling training. As the legs extend while the trainee pedals, the adjustment pull rod causes the adjustment arm to tilt backward, thus changing the moment arm. barbell plate on the first barbell axle at the longer articulation point, and the force required by the person training to pedal on the pedal increases, so as to guarantee a good training effect and smooth pedaling.

[0019] 4. The present invention is equipped with an adjustable safety mechanism to prevent the coupling arm to fall due to errors during training, thus improving training safety.

[0020] 5. The present invention is equipped with a locking control mechanism, so that The trainer can easily adjust the backrest angle on the seat. The adjustment is convenient, and the user can feel in real time whether the backrest angle is adjustable. At the same time, the first air spring can provide support on the backrest during angle adjustment to prevent the trainer from falling instantly and improve the reliability of the adjustment. Brief description of the drawings

[0021] Fig. 1 is a diagram of the overall structure of the present invention;

[0022] The [Fig.2] is a diagram of the lateral structure of the present invention;

[0023] Fig. 3 is a diagram of the structure concealing the sliding plate of the present invention;

[0024] The [Fig.4] is an enlargement figure of the Asur part of the [Fig.3];

[0025] Fig. 5 is a cross-sectional view of the structure of the first fixing lock of the present invention;

[0026] The [Fig.6] is a cross-sectional view of the structure of the second fixing lock of the present invention;

[0027] The attached figures are labeled as follows:

[0028] 1. frame; 2. coupling arm; 3. mounting bracket; 4. chassis; 5. pedal; 51. 1. Support handle; 6. Second barbell axle; 7. First barbell axle; 8. Adjustment arm; 9. Adjustment pull rod; 10. Seat; 101. Seat; 102. Backrest; 11. Sliding plate; 12. First locking mechanism; 121. First locking shell; 122. First lock; 123. First limiting rod; 124. Sliding rod; 125. First return spring; 13. Adjustment tube; 14. Adjustment rod; 141. Second adjustment hole; 15. Second locking mechanism; 151. Second locking shell; 152. Second limiting rod; 153. Second return spring; 154. Second lock; 16. Brake cable; 17. Adjustable safety mechanism; 171. Moving rod; 172. Adjustment lever; 173. First buffer block; 174. Fixing tube; 18. Sliding sleeve; 19. Sliding axle; 20. First air spring; 21. Adjustment handle; 22. Second buffer block; 23. Crankset; 24. Pedal holder closing plate; 25. Assist rod; 26. Seat armrest handle; 27. Adjustment plate; 271.1. Adjustment hole; 28. Lever; 29. ​​Second air spring; 30. Connecting rod; 31. Rear barbell axle stop. Detailed description of the implementation methods

[0029] To make the present invention clearer and more understandable, the present invention is described in more detail below with reference to the accompanying figures and specific embodiments. It should be understood that the given embodiments are merely one possible embodiment and do not represent all possible embodiments.

[0030] In this text, terms such as "upper, lower, front and rear" are established on the basis of the position relations illustrated in the accompanying figures; according to the various annexed figures, the corresponding position relations are also liable to change accordingly, therefore not allowing them to be understood as an absolute limitation in the coverage of the protection.

[0031] With reference to Figures 1-6, an adjustable leg training apparatus comprises a frame 1, a pedal 5, a chassis 4, a pedal holder, and a seat 10. Said pedal holder comprises a coupling arm 2 and a mounting bracket 3. The lower end of said chassis 4 is articulated with the frame 1, the upper end of the chassis 4 is articulated with the front end of the coupling arm 2, the front end of said coupling arm 2 is connected to the first barbell axle 7, the rear end of the coupling arm 2 is fixedly connected to the lower end of the mounting bracket 3, and the rear end of the coupling arm 2 is articulated to the frame 1. The position of the rear end of the coupling arm 2 is higher than the position of the front end of the coupling arm 2. The front side of the upper end of the mounting bracket 3 is connected to said pedal 5, a second barbell axle 6 is installed on the rear side of the mounting bracket 3.The second barbell axle 6 is connected to the mounting bracket 3 via the rear barbell axle stop 31. The seat 10 is mounted on the frame 1 by means of a position adjustment mechanism and an angle adjustment mechanism, and the seat 10 is located on the front side of the frame 4. More specifically, the pedal 5 is connected to the mounting bracket 3 via the pedal holder closure plate 24. The pedal 5 is attached to the front end of the pedal holder closure plate 24. The rear end of the pedal holder closure plate 24 is provided with an assist rod 25. The upper end of the assist rod 25 is hinged to the rear end of the pedal holder closure plate 24, the lower end of the assist rod 25 is hinged to the frame 1, and the mounting bracket 3 is hinged to the position of the middle towards the rear of the pedal door closing plate 24.The pedal assembly 23 is fixed to the frame 1 in front of said seat 10. Said first barbell axle 7 and said second barbell axle 6 are used to hold barbell plates. The upper end of said pedal 5 is provided with a grip handle 51.

[0032] Specifically, said position adjustment mechanism comprises a sliding plate 11 and an adjustment plate 27. Said adjustment plate 27 is fixedly connected to the frame 1. Several first adjustment holes 271 are arranged along the front and rear directions on the adjustment plate 27, and the sliding plate 11 is slidably arranged on the frame 1. The first retaining latch 12, which corresponds to the first adjustment hole 271, is placed on the sliding plate 11. Said seat 10 is arranged on the sliding plate 11, and when the first retaining latch 12 is disengaged from the first adjustment hole 271, the sliding plate 11 can slide within the hole 271. By moving the sliding plate 11, the first retaining latches 12 correspond to different first adjustment holes 271.By inserting the first fixing locks 12 into the first adjustment holes 271, the sliding plate 11 is fixed, thus enabling the adjustment of the seat position 10. More specifically, a second air spring 29 is provided on the front side of the sliding plate 11. One end of said second air spring 29 is connected to the sliding plate 11, and the other end of the second air spring 29 is connected to the frame 1. Said second air spring 29 can play an assisting role in order to improve the reliability of the position adjustment.

[0033] Specifically, a sliding shaft 19 is fixed to said frame 1. There are two said sliding shafts 19 distributed on either side of the frame 1. A sliding sleeve 18 is slidably mounted on said sliding shaft 19. The end of the sliding shaft 19 is provided with a buffer. The buffer can prevent the sliding sleeve 18 from colliding, etc. The length of said sliding sleeve 18 is less than that of the sliding shaft 19. The two ends of said sliding plate 11 are fixedly connected to the two sliding sleeves 18 respectively. The sliding plate 11 can slide along the sliding shaft 19 by means of the sliding sleeve 18, and the sliding plate 11 is located above the adjusting plate 27.

[0034] Specifically, said sliding plate 11 is provided with an adjustment handle 21, and the first fixing lock 12 comprises a first fixing shell 121, a first lock 122, a first return spring 125 and a first limiting rod 123. Said first fixing shell 121 is fixedly connected to the sliding plate 11, and the first fixing shell 121 is connected to the sliding plate 11, said first lock 122 is slidably arranged in the first fixing shell 121, the first lock 122 is located at one end of the first fixing shell 121 that approaches the sliding plate 11, and said first limiting rod 123 is fixed in the first fixing shell 121, the first limiting rod 123 is located at one end of the first fixing shell 121 that moves away from the sliding plate 11. One end of the said first lock 122 away from the sliding plate 11 is provided with a sliding rod 124. The diameter of said sliding rod 124 is less than those of the first lock 122 and the first limiting rod 123, the sliding rod 124 slides through the first limiting rod 123 and extends outwards from the first fixing shell 121, and said first return spring 125 is disposed between the first limiting rod 123 and the first lock 122;

[0035] One end of said adjustment handle 21 is articulated with the sliding plate 11, the other end of the adjustment handle 21 extends to one side of the seat 10, and one end of said sliding rod 124 located outside the first fixing shell 121 is connected to the adjustment handle 21. When the position of the seat 10 needs to be adjusted, the trainer simply needs to lift one end of the adjustment handle 21 which is located on one side of the seat 10, the adjustment handle 21 will pull the first lock 122 upwards at the moment of lifting it, the first lock 122 will disengage from the first adjustment hole 271, the first return spring 125 will be compressed, and the sliding plate 11 can slide at that moment.After moving the sliding plate 11 into the correct position, the trainer releases the adjustment handle 21. The first return spring 125 loses its compression and returns to its initial position. This first return spring 125 causes the first lock 122 to move downwards, and the first lock 122 is inserted into the first adjustment hole 271, securing the sliding plate 11. The method for adjusting the position of the seat 10 is simple and convenient, and the trainer can easily make the adjustment on the seat 10.

[0036] Specifically, said seat 10 comprises a seat 101 and a backrest 102. Said seat 101 is fixedly connected to the sliding plate 11, the positions on both sides of the seat 101 are provided with the armrest handles of the seat 26, the trainer can hold the armrest handles of the seat to obtain support. The lower end of the backrest 102 is articulated with the sliding plate 11, said angle adjustment mechanism includes an adjustment rod 14 and an adjustment tube 13, one end of said adjustment tube 13 is articulated with the upper end of the backrest 102, and the other end of the adjustment tube 13 is slidably fitted onto the outer wall of one end of the adjustment rod 14. Another end of said adjustment rod 14 is articulated with the sliding plate 11, several second adjustment holes 141 are arranged in the direction of the length of the adjustment rod 14.The second fixing lock 15, which corresponds to the second adjustment hole 141, is installed on said adjustment tube 13. When the second fixing lock 15 is released from the second adjustment hole 141, the adjustment tube 13 can slide along the adjustment rod 14, causing the backrest 102 to rotate, thus adjusting the angle of the backrest 102; the adjustment tube 13 can be fixed. by inserting the second fixing lock 15 into the second adjustment hole 141, so as to fix the backrest 102.

[0037] Specifically, a locking control mechanism is provided on one side of said seat 101 to control the locking / unlocking of the second fixing lock 15 in the second adjustment hole 141. A first air spring 20 is installed on the rear side of said backrest 102, one end of said first air spring 20 is articulated with the backrest 102, another end of the first air spring 20 is articulated with the sliding plate 11, the first air spring 20 can act as a support on the backrest 102 when adjusting the angle to prevent the trainee from falling instantly and improve the reliability of the adjustment.

[0038] Specifically, said second fixing lock 15 comprises a second fixing shell 151, a second lock 154, a second return spring 153 and a second limiting rod 152.The second fixing shell 151 is fixedly connected to the adjusting tube 13, and the second fixing shell 151 is connected to the adjusting tube 13, the second lock 154 is slidably disposed in the second fixing shell 151, the second lock 154 is located at one end of the second fixing shell 151 which approaches the adjusting tube 13, the second limiting rod 152 is fixed in the second fixing shell 151, and the second limiting rod 152 is located at one end of the second fixing shell 151 which is away from the adjusting tube 13, a wiring hole is provided in the second limiting rod 152, and the second return spring 153 is positioned between the second limiting rod 152 and the second lock 154; .

[0039] Said lock control mechanism comprises a brake cable 16 and a lever 28. Said lever 28 is articulated with a seat side 101. One end of said brake cable 16 is connected to the lever 28, and another end of the brake cable 16 passes through the wiring hole and the second return spring 153, and connects to said second lock 154. When the angle of the backrest 102 needs to be adjusted, the operator simply needs to lift the lever 28, thereby pulling the brake cable 16. The brake cable 16 pulls the second lock 154, the second lock 154 is disengaged from the second adjustment hole 141, and the second return spring 153 is compressed; at this point, the adjustment tube 13 can slide. After adjusting the backrest 102 to a suitable angle, the trainer releases the lever 28, the second return spring 153 loses its compression effect and returns to its initial position.The second return spring 153 causes the second lock 154 to move, allowing the second lock 154 to be inserted into the second adjustment hole 141 and the adjustment tube 13 to be fixed, thus fixing the backrest 102. The lock control mechanism makes it easy for the trainer to adjust the angle of the backrest 102 on the seat 10, convenient. and simple to use. More specifically, several cable tubes are provided on the rear side of the backrest 102, and the routing of the brake cable arrangement 16 is limited by the cable tubes, so that the brake cables 16 are neatly arranged and prevent the brake cables 16 from being caught by external objects.

[0040] Specifically, a second buffer block 22 is fixed on said sliding plate 11, said second buffer block 22 is located on the rear side of the backrest 102, the second buffer block 22 can play a role in protecting the backrest 102.

[0041] Specifically, said chassis 4 is a U-shaped frame, and there are two said coupling arms 2, the two coupling arms 2 are respectively located on the two sides of the seat 10, and the front ends of the two coupling arms 2 are respectively connected to the two vertical rods of the U-shaped frame. A connecting rod 30 and a repositioning handle are installed on the front side of the lower end of the chassis 4, said repositioning handle is articulated on the frame 1, one end of said connecting rod 30 is articulated with the chassis 4, and the other end of the connecting rod 30 is articulated with the repositioning handle, the articulation point of the connecting rod 30 with the repositioning handle is located below the articulation point of the frame 1 with the repositioning handle;A third buffer block and a fourth buffer block are also fixed to said chassis 1, and said third buffer block is located on the front side of the lower end of chassis 4, the fourth buffer block is located on the rear side of the upper end of chassis 4, the two buffer blocks give a protective and supporting effect to chassis 4; the trainer can rotate chassis 4 by waving the repositioning handle to adjust the state of the trainer, specifically, before training, push the repositioning handle forward, so that chassis 4 presses against the fourth buffer block on its rear side, at the end of training, simply pull the repositioning handle.

[0042] Specifically, it also includes an adjustment arm 8 and an adjustment pull rod 9. The lower end of said adjustment arm 8 is articulated with the front end of the coupling arm 2, the upper end of the adjustment arm 8 is fixed to said first barbell axle 7. One end of said adjustment pull rod 9 is articulated with the adjustment arm 8, and the other end of the adjustment rod 9 is articulated with the frame 1, the adjustment arm 8 and the adjustment rod 9 make it possible to change the moment arm during training, so that the training load can be increased with the extension of the legs of the person being trained, while ensuring that the person being trained can pedal smoothly, at the same time ensuring that the training weight meets the training requirements.More specifically, the front end of said coupling arm 2 is fitted with a safety hook, when the adjustment arm 8 falls due to. In the event of the screws falling or for other reasons, the safety hook can retain the adjustment arm 8 and prevent the adjustment arm 8 from falling towards the seat 10, so as to prevent the adjustment arm 8 from injuring the training person, thus providing a guarantee of safety to the user.

[0043] Specifically, said frame 1 is provided with an adjustable safety mechanism 17, the adjustable safety mechanism 17 being located below said coupling arm 2. Said adjustable safety mechanism 17 comprises an adjustment handle 172, a fixing tube 174 and a movable rod 171, said fixing tube 174 is fixed to the frame 1, said movable rod 171 is slidably installed in the fixing tube 174, and the two ends of the movable rod 171 extend to the outside of the fixing tube 174, there are several third adjustment holes which are arranged in the longitudinal direction on said movable rod 171. The third fixing lock which corresponds to the third adjustment hole is placed on said fixing tube 174, a first buffer block 173 is installed at the upper end of said movable rod 171, said adjustment handle 172 is fixed to the lower end of the movable rod 171.The adjustable safety mechanism 17 prevents the coupling arm 2 from falling due to errors during training, thus improving training safety.

[0044] The foregoing describes embodiments of the present invention with reference to the accompanying figures, but the present invention is not limited to the embodiments described. It should be emphasized that, for technical personnel in this field, provided they do not depart from the principle and spirit of the present invention, a number of changes, modifications, replacements, and transformations must also be taken into account in the scope of protection of the present invention.

Claims

Demands

1. Adjustable leg training apparatus, characterized in that it consists of: a frame (1), a chassis (4), a pedal (5), a pedal support and a seat (10); said pedal support comprising a coupling arm (2) and a fixing support (3); the lower end of said chassis (4) being articulated with the frame (1), the upper end of the chassis (4) being articulated with the front end of the coupling arm (2); the front end of said coupling arm (2) being connected with a first barbell axle (7), the rear end of the coupling arm (2) being fixedly connected to the lower end of the fixing support (3), the rear end of the coupling arm (2) being articulated on the frame (1); the front side of the upper end of said fixing support (3) being connected to said pedal (5), the rear side of the fixing support (3) being housing a second barbell axle (6);said seat (10) being installed on the frame (1) by means of a position adjustment mechanism and an angle adjustment mechanism, and the seat (10) being located on the front side of the chassis (4).;

2. Adjustable leg training device according to claim 1, characterized in that: said position adjustment mechanism comprising a sliding plate (11) and an adjustment plate (27), said adjustment plate (27) being fixedly connected to the frame (1) and along the front and rear directions of the adjustment plate (27) being arranged several first adjustment holes (271), said sliding plate (11) being slidably arranged on the frame (1), on the sliding plate (11) being placed the first fixing lock (12) which corresponds to the first adjustment hole (271); said seat (10) being arranged on the sliding plate (11).

3. Adjustable leg training device according to claim 2, characterized in that: said sliding plate (11) is provided with an adjustment handle (21), and said first locking device (12) comprises a first locking shell (121), a first locking device (122), a first return spring (125), and a first limiting rod (123); said first locking shell (121) is fixedly connected to the sliding plate (11), and the first locking shell (121) is connected to the sliding plate (11); said first locking device (122) is slidably arranged in

4.

5. the first fixing shell (121), the first lock (122) being located at one end of the first fixing shell (121) which approaches the sliding plate (11); said first limiting rod (123) being fixed in the first fixing shell (121), the first limiting rod (123) being located at one end of the first fixing shell (121) which moves away from the sliding plate (11); one end of said first lock (122) away from the sliding plate (11) being provided with a sliding rod (124); the diameter of said sliding rod (124) being less than those of the first lock (122) and of the first limiting rod (123), the sliding rod (124) sliding through the first limiting rod (123) and extending outwards from the first fixing shell (121); said first return spring (125) being disposed between the first limiting rod (123) and the first lock (122);one end of said adjustment handle (21) being articulated with the sliding plate (11), the other end of the adjustment handle (21) extending to one side of the seat (10); one end of said sliding rod (124) located outside the first fixing shell (121) being connected to the adjustment handle (21). Adjustable leg training device according to claim 2, characterized in that: said seat (10) comprising a seat (101) and a backrest (102); said seat (101) being fixedly connected to the sliding plate (11), the lower end of the backrest (102) being articulated with the sliding plate (11); said angle adjustment mechanism comprising an adjustment rod (14) and an adjustment tube (13), one end of said adjustment tube (13) being articulated with the upper end of the backrest (102), and the other end of the adjustment tube (13) being slidably fitted onto the outer wall of one end of the adjustment rod (14), another end of said adjustment rod (14) being articulated with the sliding plate (11), in the direction of the length of the adjustment rod (14) several second adjustment holes (141);on said adjustment tube (13) being installed the second fixing lock (15) which corresponds to the second adjustment hole (141).; Adjustable leg training device according to claim 4, characterized in that: a locking control mechanism is provided on one side of said seat (101) to control the locking / unlocking the second fixing lock (15) in the second adjustment hole (141).

6. Adjustable leg training device according to claim 5, characterized in that: said second fixing lock (15) comprising a second fixing shell (151), a second lock (154), a second return spring (153) and a second limiting rod (152); said second fixing shell (151) being fixedly connected to the adjustment tube (13), and the second fixing shell (151) being connected to the adjustment tube (13); said second lock (154) being slidably arranged in the second fixing shell (151), the second lock (154) being located at one end of the second fixing shell (151) which approaches the adjustment tube (13);said second limiting rod (152) being fixed in the second fixing shell (151), and the second limiting rod (152) being located at one end of the second fixing shell (151) which is away from the adjusting tube (13), a wiring hole being provided in the second limiting rod (152); said second return spring (153) being positioned between the second limiting rod (152) and the second lock (154); said lock control mechanism comprising a brake cable (16) and a lever (28); said lever (28) being articulated with a seat side (101); one end of said brake cable (16) being connected to the lever (28), and another end of the brake cable (16) passing through the wiring hole and the second return spring (153), and connecting to said second lock (154).

7. Adjustable leg training device according to claim 4, characterized in that: a second buffer block (22) is fixed on said sliding plate (11), said second buffer block (22) being located on the rear side of the backrest (102).

8. Adjustable leg training device according to claim 1, characterized in that: said chassis (4) being a U-shaped frame; said chassis (4) having two coupling arms (2), the two coupling arms respectively located on the two sides of the seat (10), and the front ends of the two coupling arms (2) being respectively connected to the two vertical rods of the U-shaped frame.

9. Adjustable leg training device according to claim 1 or 7, characterized in that: it also comprises an adjustment arm

10. (8) and an adjustment pull rod (9); the lower end of said adjustment arm (8) being articulated with the front end of the coupling arm (2), the upper end of the adjustment arm (8) being fixed to said first barbell axle (7); one end of said adjustment pull rod (9) being articulated with the adjustment arm (8), and the other end of the adjustment rod (9) being articulated with the frame (1). Adjustable leg training apparatus according to claim 1 or 7, characterized in that: said frame (1) being provided with an adjustable safety mechanism (17), the adjustable safety mechanism (17) being located below said coupling arm (2); said adjustable safety mechanism (17) comprising an adjustment handle (172), a fixing tube (174) and a movable rod (171); said fixing tube (174) being fixed to the frame (1);said movable rod (171) being slidably installed in the fixing tube (174), the two ends of the movable rod (171) extending to the outside of the fixing tube (174), and in the lengthwise direction on said movable rod (171) being arranged several third adjustment holes; on said fixing tube (174) being housed the third fixing lock which corresponds to the third adjustment hole; at the upper end of said movable rod (171) being housed a first buffer block (173); said adjustment lever (172) being fixed to the lower end of the movable rod (171).

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