Adjustable leg trainer

Abstract

This invention discloses an adjustable leg training apparatus, comprising a frame (1), a pedal (5), a chassis (4), a pedal support and a seat (10). The pedal support comprises the coupling arm (2) and the fixing bracket (3). The lower end of the chassis (4) is hinged with the frame (1), its upper end is hinged with the front end of the coupling arm (2). The rear end of the coupling arm (2) is fixed to the lower end of the fixing bracket (3) and hinged with the frame (1). This invention can improve the training effect and comfort. (Figure for abstract: Fig.1)

Description

Title of invention: Adjustable leg training apparatus Technical field

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

[0002] The leg training apparatus, which is a common fitness equipment widely used in fitness environments such as gymnasiums, integrates exercises targeting leg muscles by mainly simulating the pedaling motion of the lower body, with the aim of toning and strengthening the muscle groups of the lower body, and at the same time trains the legs at the lower body level to effectively improve the cardiovascular system and increase the bursting energy and flexibility of the legs. At present, most of the configuration of leg training stations are not flexible enough and the apparatus can only adjust the kicking distance according to the leg length of different training people. Leg training is often performed in a sitting position such as a chair.Apart from the kicking distance, the support angle for the training person also affects the comfort and effect of training; at the same time, the pedal structure for the leg training device generally has a large dead weight, so the training person will receive the gravity of the pedal structure when retracting the legs, people with lower strength are prone to the pain of supporting the weight of the pedal structure when retracting the legs, this will cause training difficulties or even injuries to the training person. The existing leg training devices cannot meet the needs of different training people, so a leg training device with high flexibility and adaptability is required. Statement of the invention

[0003] In order to solve said 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. Said pedal support comprises the coupling arm and the fixing support, the lower end of said chassis is hinged with the frame, the upper end of the chassis is hinged with the front end of the coupling arm, the front end of said coupling arm is connected to the first dumbbell axle, the rear end of the coupling arm is fixedly connected to the lower end of the fixing support, the rear end of the arm coupling is hinged with the frame, the front side of the upper end of said fixing bracket is connected to said pedal, the second dumbbell axle is installed on the rear side of the fixing bracket, said seat is installed on the frame by means of a position adjustment mechanism and an angle adjustment mechanism. The adjustment mechanism is set on the frame, and the seat is located on the front side of the chassis.

[0004] Preferably selectively, 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 which corresponds 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 latch, a first return spring and a first limiting rod, and 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 disposed in the first fixing shell, the first latch is located at one end of the first fixing shell which approaches the sliding plate, and said first limiting rod is fixed in the first fixing shell, the first limiting rod is located at one end of the first fixing shell which 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 smaller than those of the first lock and the first limiting rod, the sliding rod slidably passes through the first limiting rod and extends outwardly of 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 hinged 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 with the sliding plate. Said angle adjustment mechanism comprises an adjustment rod and an adjustment tube, one end of said adjustment tube is hinged with the upper end of the backrest, and the other end of the adjustment tube is slidably fitted on the outer wall of one end of the adjusting rod, the other end of said adjusting rod is hinged with the sliding plate, several second adjusting holes are arranged in the length direction of the adjusting rod. The second fixing lock which corresponds to the second adjusting hole is installed on said adjusting tube.

[0008] Preferably selective, a lock 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 hinged with the backrest, the other end of the first air spring is hinged with the sliding plate.

[0009] Preferably selectively, said second fixing lock comprises a second fixing shell, a second latch, a second return spring and a second limiting rod. Said second fixing shell is fixedly connected to the adjustment tube, and the second fixing shell is connected to the adjustment tube, said second lock is slidably disposed in the second fixing shell, the second latch is located at one end of the second fixing shell which approaches the adjustment 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 which is away from the adjustment tube, a wiring hole is provided in the second limiting rod, and said second return spring is laid 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 with a seating 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 selectively, 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 selectively, said chassis is a U-shaped frame, and it has two said coupling arms. The two coupling arms are located respectively at 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 selectively, it also comprises an adjustment arm and an adjustment pull rod. The lower end of said adjustment arm is hinged to the front end of the coupling arm and the upper end of the adjustment arm is fixed to said first dumbbell axle. One end of said adjustment pull rod is hinged to the adjustment arm, and the other end of the adjustment pull rod is hinged to the frame.

[0014] Preferably selective, said frame is provided with an adjustable safety mechanism, the adjustable safety mechanism is 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 on the machine, said movable rod is slidably installed in the fixing tube, and both ends of the movable rod extend to the outside of the fixing tube. Several third adjustment holes are arranged in the length direction of said movable rod, and said fixing tube is provided with a third fixing lock which 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 which allows the position to be adjusted and the angle of the backrest, the seat can be adjusted according to the height of the training person, leg length, etc., flexible to use, more ergonomic, and able to meet the needs of different training people and improve the training effect and training well-being.

[0017] 2. The present invention can alleviate the problem of self-weight of the pedal part. by increasing or decreasing the weight of the dumbbell plate on the second dumbbell shaft, that is, when the training person retracts his legs and the pedal structure returns to the state where it begins to fall by its own weight. The dumbbell plate on the second dumbbell shaft is capable of exerting force on the pedal structure opposite to the gravity of the pedal structure, so as to avoid the occurrence of the situations where the training person cannot hold the pedals when retracting his legs due to the excessive weight of the pedal structure, thereby improving the training effect and training safety. At the same time, the weight of the dumbbell plate on the second dumbbell shaft can be adjusted according to the strength of different training programs, so as to meet the needs of different training people.

[0018] 3. Since the legs of the training person are bent in the state initial training, it is very painful to stand up at this time. As the legs continue to straighten, the training person will feel relaxed, so it will be difficult to straighten the legs and stand up under the large load, but under the small load, it is unable to achieve the training effect. The present invention sets up an adjustment arm and an adjustment pull rod, which can realize the change of the moment arm during pedaling training. The legs extend as the training person pedals, the adjustment pull rod drives the adjustment arm to swing backward, making the moment arm of the dumbbell plate on the first dumbbell axle at the longer hinge point, and the force required for the training person to pedal the pedal increases, so as to ensure a good training effect and smooth pedaling.

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

[0020] 5. The present invention is provided with a lock control mechanism, so that The training person can easily adjust the angle of the backrest on the seat. The adjustment is convenient and the user can feel in real time whether the angle of the backrest is adaptable, at the same time, the first air spring can play a supporting role on the backrest when adjusting the angle to prevent the training person from falling instantly and improve the reliability of the adjustment. Brief description of the drawings

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

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

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

[0024] [Fig.4] is an enlargement figure of part A in [Fig.3];

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

[0026] [Fig.6] is a 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. holding handle; 6. second barbell shaft; 7. first barbell shaft; 8. adjustment arm; 9. adjustment pull rod; 10. seat; 101. seat; 102. backrest; 11. sliding plate; 12. first fixing lock; 121. first fixing 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 fixing lock; 151. second fixing shell; 152. second limiting rod; 153. second return spring; 154. second lock; 16. brake cable; 17. adjustable safety mechanism; 171. movable rod; 172. adjustment handle; 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. pedal assembly; 24. pedal holder closing plate; 25. assist rod; 26. seat armrest handle; 27. adjustment plate; 271.first adjustment hole; 28. lever; 29. ​​second air spring; 30. connecting rod; 31. rear dumbbell axle stop. Detailed description of the embodiments

[0029] In order to make the present invention more clear and 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 embodiments given are merely one way of carrying out the invention and do not represent all embodiments.

[0030] In the present text, terms such as "upper, lower, front and rear" are established on the basis of the positional relationships illustrated in the accompanying figures, according to the various appended figures, the corresponding positional relationships are also likely to change accordingly, therefore not being understood as an absolute limitation in the coverage of the protection.

[0031] Referring 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 fixing bracket 3, the lower end of said chassis 4 is hinged with the frame 1, the upper end of the chassis 4 is hinged 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 fixing bracket 3 and the rear end of the coupling arm 2 is hinged 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 fixing bracket 3 is connected to said pedal 5, a second axle dumbbell 6 is installed on the rear side of the fixing bracket 3.The second barbell axle 6 is connected to the fixing bracket 3 through the rear barbell axle stop 31. Said seat 10 is placed 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, said pedal 5 is connected to the fixing bracket 3 by means of the pedal holder closing plate 24. The pedal 5 is fixed to the front end of the pedal holder closing plate 24. The rear end of the pedal holder closing plate 24 is provided with an assist rod 25. The upper end of the assist rod 25 is hinged with the rear end of the pedal holder closing plate 24, the lower end of the assist rod 25 is hinged with the frame 1, and the fixing bracket 3 is hinged on the middle position towards the rear of the pedal holder closing plate 24.The pedal 23 is fixed on the frame 1 in front of said seat 10. Said first dumbbell axle 7 and said second dumbbell axle 6 are used for placing dumbbell plates. The upper end of said pedal 5 is provided with a holding 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 fixing lock 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 fixing lock 12 is disengaged from the first adjustment hole 271. In the hole 271, the sliding plate 11 can slide. By moving the sliding plate 11, the first fixing locks 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, so as to realize the adjustment of the position of the seat 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 so as to improve the reliability of the position adjustment.

[0033] Specifically, a sliding shaft 19 is fixed on said frame 1. There are two said sliding shafts 19 which are distributed at both sides of the frame 1, a sliding sleeve 18 is slidably laid 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 adjustment 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 which 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 which moves away from the plate sliding 11. One end of said first lock 122 remote from the sliding plate 11 is provided with a sliding rod 124. The diameter of said sliding rod 124 is smaller than those of the first lock 122 and the first limiting rod 123, the sliding rod 124 slidably passes through the first limiting rod 123 and extends outward 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 adjusting handle 21 is hinged with the sliding plate 11, the other end of the adjusting 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 adjusting handle 21. When the position of the seat 10 needs to be adjusted, the training person simply needs to lift one end of the adjusting handle 21 which is located on one side of the seat 10, the adjusting handle 21 will pull the first lock 122 upwards at the time of lifting it, the first lock 122 will disengage from the first adjusting hole 271, the first return spring 125 will be compressed, and the sliding plate 11 can slide at this time.After moving the sliding plate 11 to the proper position, the training person releases the adjustment handle 21, the first return spring 125 loses its compressive effect and returns to its initial position. The first return spring 125 drives the first lock 122 to move downward, and the first lock 122 is inserted into the first adjustment hole 271, and fixes the sliding plate 11. The method of adjusting the position of the seat 10 is simple and convenient, and the training person can simply perform 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 of two sides of the seat 101 are provided with the seat armrest handles 26, the training person can hold the seat armrest handles to obtain supports. The lower end of the backrest 102 is hinged with the sliding plate 11, said angle adjustment mechanism comprises an adjustment rod 14 and an adjustment tube 13, one end of said adjustment tube 13 is hinged with the upper end of the backrest 102, and the other end of the adjustment tube 13 is slidably fitted on the outer wall of one end of the adjustment rod 14. Another end of said adjustment rod 14 is hinged with the sliding plate 11, several second adjustment holes 141 are arranged in the length direction 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 disengaged from the second adjustment hole 141, the adjustment tube 13 can slide along the adjustment rod 14, causing the backrest 102 to rotate, thereby 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 lock 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 hinged with the backrest 102, another end of the first air spring 20 is hinged with the sliding plate 11, the first air spring 20 can play a supporting role on the backrest 102 when adjusting the angle to prevent the training person 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.Said second fixing shell 151 is fixedly connected to the adjustment tube 13, and the second fixing shell 151 is connected to the adjustment tube 13, said 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 adjustment tube 13, said 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 adjustment tube 13, a wiring hole is provided in the second limiting rod 152, and said second return spring 153 is laid 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 hinged 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 driving person simply needs to lift the lever 28, to pull the brake cable 16 by lifting the lever 28. The brake cable 16 pulls the second lock 154, the second lock 154 is released from the second adjustment hole 141, and the second return spring 153 is compressed, at this time, 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 drives 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, thereby fixing the backrest 102. The control mechanism of the lock is easy for the training person to adjust the angle of the backrest 102 on the seat 10, convenient. and simple to use. Specifically, multiple wiring tubes are provided on the rear side of the backrest 102, and the routing of the arrangement of the brake cables 16 is limited through the wiring tubes, so that the brake cables 16 are neatly arranged and prevent the brake cables 16 from being snagged by external objects.

[0040] Specifically, a second buffer block 22 is fixed on said sliding plate 11, said second buffer block 22 is located at the rear side of the backrest 102, the second buffer block 22 can play a role of 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 at 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 hinged to the frame 1, one end of said connecting rod 30 is hinged with the chassis 4, and the other end of the connecting rod 30 is hinged with the repositioning handle, the hinge point of the connecting rod 30 with the repositioning handle is located below the hinge point of the frame 1 with the repositioning handle;a third buffer block and a fourth buffer block are also fixed on said chassis 1, and said third buffer block is located at the front side of the lower end of the chassis 4, the fourth buffer block is located at the rear side of the upper end of the chassis 4, the two buffer blocks give a protection and support effect to the chassis 4; the training person can rotate the chassis 4 by shaking the reposition handle to adjust the state of the training apparatus, precisely, before training, push the reposition handle forward, so that the chassis 4 press the fourth buffer block on its rear side, at the end of training, just pull the reposition handle. ;

[0042] Specifically, it also comprises an adjustment arm 8 and an adjustment pull rod 9. The lower end of said adjustment arm 8 is hinged with the front end of the coupling arm 2, the upper end of the adjustment arm 8 is fixed to said first dumbbell shaft 7. One end of said adjustment pull rod 9 is hinged with the adjustment arm 8, and the other end of the adjustment rod 9 is hinged with the frame 1, the adjustment arm 8 and the adjustment rod 9 can realize the change of the moment arm during training, so that the training load can be increased with the extension of the legs of the training person, while ensuring that the training person can pedal smoothly, at the same time ensuring that the training weight meets the training needs.More specifically, the front end of said coupling arm 2 is provided with a safety hook, when the adjustment arm 8 falls due to . the screws fall off or for other reasons, the safety hook can hold 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, thereby providing safety guarantee for the user.

[0043] Specifically, said frame 1 is provided with an adjustable safety mechanism 17, the adjustable safety mechanism 17 is 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 on the frame 1, said movable rod 171 is slidably installed in the fixing tube 174, and both 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 length 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 at the lower end of the movable rod 171.The adjustable safety mechanism 17 can prevent the coupling arm 2 from falling due to errors during training, thereby improving the safety of the training.

[0044] The foregoing describes embodiments of the present invention with reference to the accompanying figures, but the present invention is not limited to the described embodiments. It should be emphasized that, for those skilled in the art in the present field, provided that they do not deviate from the principle and spirit of the present invention, a number of changes, modifications, replacements and transformations should also be considered within the scope of protection of the present invention.

Claims

Claims

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 bracket (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 dumbbell axle (7), the rear end of the coupling arm (2) being fixedly connected to the lower end of the fixing bracket (3), the rear end of the coupling arm (2) being articulated to the frame (1); the front side of the upper end of said fixing bracket (3) being connected to said pedal (5), the rear side of the fixing bracket (3) being housed a second dumbbell axle (6);said seat (10) being installed on the frame (1) through a position adjustment mechanism and an angle adjustment mechanism, and the seat (10) being located at the front side of the chassis (4).;

2. An adjustable leg training apparatus according to claim 1, characterized in that: said position adjustment mechanism comprises 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. An adjustable leg training apparatus according to claim 2, characterized in that: said sliding plate (11) is provided with an adjustment handle (21), and said 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

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 latch (122) moved away from the sliding plate (11) being provided with a sliding rod (124);the diameter of said sliding rod (124) being smaller than those of the first latch (122) and the first limiting rod (123), the sliding rod (124) slidingly passing through the first limiting rod (123) and extending outwardly of the first fixing shell (121);said first return spring (125) being disposed between the first limiting rod (123) and the first latch (122);one end of said adjustment handle (21) being hinged 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).; An adjustable leg training apparatus according to claim 2, characterized in that: said seat (10) comprises 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 hinged with the sliding plate (11);said angle adjustment mechanism comprises an adjustment rod (14) and an adjustment tube (13), one end of said adjustment tube (13) being hinged with the upper end of the backrest (102), and the other end of the adjustment tube (13) being slidably fitted on the outer wall of one end of the adjustment rod (14),another end of said adjustment rod (14) being hinged with the sliding plate (11), in the length direction of the adjustment rod (14) being arranged 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).; An adjustable leg trainer according to claim 4, characterized in that: a lock control mechanism is provided on one side of said seat (101) for controlling the locking / unlocking the second fixing lock (15) in the second adjustment hole (141).

6. An adjustable leg training apparatus according to claim 5, characterized in that: 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); 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 disposed 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 distant from the adjustment tube (13), a wiring hole being provided in the second limiting rod (152);said second return spring (153) being laid 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 hinged 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. An adjustable leg training apparatus 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 at the rear side of the backrest (102).

8. An adjustable leg training apparatus according to claim 1, characterized in that: said frame (4) is a U-shaped frame; said frame (4) has two coupling arms (2), the two coupling arms respectively located at 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.

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

10. (8) and an adjusting pull rod (9); the lower end of said adjusting arm (8) being hinged with the front end of the coupling arm (2), the upper end of the adjusting arm (8) being fixed to said first dumbbell shaft (7); one end of said adjusting pull rod (9) being hinged with the adjusting arm (8), and the other end of the adjusting rod (9) being hinged with the frame (1). Adjustable leg training apparatus according to claim 1 or 7, characterized in that: 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) comprising an adjusting handle (172), a fixing tube (174) and a movable rod (171); said fixing tube (174) being fixed on the frame (1);said movable rod (171) being slidably installed in the fixing tube (174), both ends of the movable rod (171) extending to the outside of the fixing tube (174), and in the length 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 handle (172) being fixed to the lower end of the movable rod (171).;

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