CN215459877U

CN215459877U - Leg flexion and extension trainer

Info

Publication number: CN215459877U
Application number: CN202121446581.3U
Authority: CN
Inventors: 田野
Original assignee: Hebei Daai Intelligent Technology Co ltd
Current assignee: Hebei Daai Intelligent Technology Co ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2022-01-11
Anticipated expiration: 2031-06-28

Abstract

The utility model discloses a leg flexion and extension trainer which comprises a base assembly, a seat assembly, a limb fixing mechanism and a driving mechanism. The seat back component is arranged at one end of the base component; the limb fixing mechanism comprises a foot and a fixing component, and the foot fixing component is arranged at one end of the base component far away from the seat component; actuating mechanism installs in the base subassembly, and actuating mechanism includes that driving motor and transmission are connected in driving motor's drive belt, and foot fixed subassembly is connected in the drive belt to accessible drive belt reciprocating motion on the base subassembly, with being close to or keeping away from the seat subassembly. The leg flexion and extension trainer of the technical scheme of the utility model can ensure that a patient can carry out comfortable and effective leg flexion and extension training and ensure good training effect.

Description

Leg flexion and extension trainer

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a leg flexion and extension trainer.

Background

For some patients with leg injuries, the legs are usually required to be subjected to flexion and extension exercises in the subsequent rehabilitation treatment process, and the knee joints and the ankle joints can be trained in the flexion and extension exercises, so that the patients can be helped to recover quickly. However, some of the flexion and extension training devices in the related art cannot keep the patient in a comfortable state for effective leg flexion and extension training during use, and thus the training effect is not ideal.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a leg flexion and extension trainer, aiming at enabling a patient to carry out comfortable and effective leg flexion and extension training and ensuring good training effect.

In order to achieve the above object, the present invention provides a leg flexion and extension training device, comprising:

a base assembly;

a seat back assembly mounted to one end of the base assembly;

the limb fixing mechanism comprises a foot fixing component, and the foot fixing component is arranged at one end of the base component far away from the seat component; and

the driving mechanism is arranged in the base assembly and comprises a driving motor and a transmission belt connected with the driving motor in a transmission mode, and the foot fixing assembly is connected with the transmission belt and can drive the base assembly to reciprocate through the transmission belt so as to be close to or far away from the seat assembly.

Optionally, the base component is provided with two parallel slide rails, the transmission belt is located between the two slide rails, the extending direction of the two slide rails is the same as the transmission direction of the transmission belt, each slide rail is provided with a slide block, the driving mechanism further comprises a fixing plate, the fixing plate is connected with the transmission belt and is connected with the two slide rails in a sliding manner through the slide blocks, and the foot fixing component is connected with the transmission belt through the fixing plate.

Optionally, the leg flexion and extension trainer further comprises a limiting mechanism, wherein the limiting mechanism comprises a first limiting part and a second limiting part which are arranged between the two slide rails, the first limiting part and the second limiting part respectively correspond to the two ends of the slide rails, and the fixing plate can be limited in sliding.

Optionally, stop gear still includes spacing axle and stopper, first locating part install in the stopper, spacing axle is installed in two between the slide rail, the length direction of spacing axle with two the extending direction of slide rail is the same, the one end of spacing axle stretch out in the base subassembly to be connected with the knob, the stopper install in spacing axle, and part stretch out in the upper surface of base subassembly, the stopper stretches out the part of base subassembly is installed spacing pointer, the upper surface of base subassembly corresponds spacing pointer is equipped with the scale.

Optionally, the foot fixing component comprises a connecting plate and a foot support, the connecting plate is connected with the fixing plate and arranged at an included angle with the base component, and the foot support is arranged on one side of the connecting plate facing the seat support component and used for fixing feet of a human body.

Optionally, the limb fixing mechanism further comprises a shank arm assembly for fixing a shank of a human body and a thigh arm assembly for fixing a thigh of the human body, one end of the shank arm assembly is hinged to the side edge of the connecting plate, the other end of the shank arm assembly is hinged to the thigh arm assembly, and one end, far away from the shank arm assembly, of the thigh arm assembly is hinged to the base assembly.

Optionally, the calf arm assembly and/or the thigh arm assembly is provided with a leg strap.

Optionally, the base assembly includes a chassis and a bottom frame, the bottom frame is rotatably coupled to one end of the chassis, the driving mechanism is installed in the chassis, the seat assembly is installed above the bottom frame, and the bottom frame rotates relative to the chassis and can be folded at the bottom of the chassis.

Optionally, the seat subassembly includes bedplate and back board, the bedplate is located the chassis is close to the one end of quick-witted case, the back board is located the bedplate and is kept away from one side of quick-witted case, the bedplate with the back board is the contained angle setting.

Optionally, the backrest plate is rotatably connected to the base frame to adjust an included angle between the backrest plate and the seat plate, and a supporting structure is further arranged between the backrest plate and the base frame and used for supporting and fixing the backrest plate.

According to the leg flexion and extension trainer in the technical scheme, in the training and use process, a patient can firstly keep on the seat support component in a sitting posture, then extend out of the foot to fix the foot on the foot fixing component far away from the seat support component, and the foot fixing component is connected with the transmission belt, so that when the transmission belt is driven by the driving motor to transmit in the positive and negative directions, the foot fixing component can be driven to reciprocate along the base component, and the leg is pulled to be driven to carry out flexion and extension. In the scheme, the patient can be pulled by the foot fixing component to realize leg bending and stretching under the condition of keeping the sitting and leaning posture, so that the patient can keep a comfortable state to carry out effective bending and stretching training, and a good training effect is fully ensured. Moreover, the driving motor is utilized to drive the driving belt to carry out traction, so that the stability of the bending and stretching movement process is better.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view of an embodiment of a leg flexion and extension trainer in accordance with the present invention;

FIG. 2 is a schematic diagram of the exploded structure of FIG. 1;

FIG. 3 is a schematic view of a part of the structure of the leg flexion and extension trainer of the utility model;

FIG. 4 is a schematic view of the leg flexion-extension training device of the present invention in a folded state;

FIG. 5 is a schematic view of the leg flexion-extension trainer in a training use state;

FIG. 6 is a schematic view of another training state of the leg flexion-extension trainer in accordance with the present invention;

FIG. 7 is a schematic view of the leg flexion and extension training device of the present invention in a training use state;

fig. 8 is a schematic view of the leg flexion-extension training device in a still further training use state.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The present invention provides a leg flexion and extension trainer 100.

Referring to fig. 1 and 2, in the embodiment of the present invention, the leg flexion and extension exerciser 100 includes a base assembly 10, a seat assembly 20, a limb fixing mechanism 30 and a driving mechanism. The seat back assembly 20 is mounted at one end of the base assembly 10; the limb fixation mechanism 30 comprises a foot fixation component 31, and the foot fixation component 31 is arranged at one end of the base component 10 far away from the seat component 20; the driving mechanism is installed in the base assembly 10, the driving mechanism includes a driving motor 41 and a transmission belt 42 drivingly connected to the driving motor 41, and the foot fixing assembly 31 is connected to the transmission belt 42 and can be driven by the transmission belt 42 to reciprocate on the base assembly 10 to approach or depart from the seat assembly 20.

Wherein the base assembly 10 may be formed as a bar structure and the seat assembly 20 is used to maintain the patient in a seated position for exercise. The driving motor 41 can be fixed on the base assembly 10 by the motor base 43 to ensure the stability of the installation of the driving motor 41. In this embodiment, a first driving wheel 44 and a second driving wheel 45 are installed in the base assembly 10, and the first driving wheel 44 and the second driving wheel 45 are located in the extending direction of the front side of the seat assembly 20, the first driving wheel 44 is connected to the output shaft of the driving motor 41, and the driving belt 42 is wound around the first driving wheel 44 and the second driving wheel 45, so that when the driving motor 41 is started, the first driving wheel 44 forms a driving wheel, and the second driving wheel 45 forms a driven wheel, so as to jointly drive the driving belt 42 to perform a smooth transmission motion.

In practical applications, the driving motor 41 is electrically connected to the power line 411 and the controller 412, so that when the power line 411 is connected to the power source, a user can hold the controller 412 to control the driving motor 41 to rotate forward and backward, thereby driving the foot fixing component 31 fixed on the transmission belt 42 to reciprocate and realizing the leg flexion and extension training.

Therefore, as shown in fig. 5 to 8, in the leg flexion and extension training device 100 according to the technical solution of the present invention, during training and use, a patient can firstly keep on the seat rest component 20 in a sitting posture, and then extend out of the feet to fix the feet on the foot fixing component 31 far away from the seat rest component 20, and the foot fixing component 31 is connected to the transmission belt 42, so that when the driving motor 41 drives the transmission belt 42 to transmit in the forward and reverse directions, the foot fixing component 31 can be driven to reciprocate along the base component 10, so as to pull and drive the legs to perform flexion and extension movements. In the scheme, the patient can be pulled by the foot fixing component 31 to realize leg bending and stretching under the condition of keeping the sitting and leaning posture, so that the patient can keep a comfortable state to carry out effective bending and stretching training, and a good training effect is fully ensured. Moreover, the driving motor 41 is used to drive the driving belt 42 for traction, so that the stability of the bending and stretching movement process is better.

Referring to fig. 3 in combination, in order to further improve the stability of the reciprocating motion of the foot fixing component 31 on the base component 10, in an embodiment of the present application, the base component 10 is provided with two slide rails 46 parallel to each other, the driving belt 42 is located between the two slide rails 46, the extending direction of the two slide rails 46 is the same as the conveying direction of the driving belt 42, each slide rail 46 is provided with a sliding block 47, the driving mechanism further includes a fixing plate 48, the fixing plate 48 is connected to the driving belt 42 and slidably connected to the two slide rails 46 through the sliding block 47, and the foot fixing component 31 is connected to the driving belt 42 through the fixing plate 48.

In this embodiment, two slide rails 46 are disposed in the base assembly 10, and the length of the slide rail 46 is equivalent to the length of the transmission belt 42, and the fixing plate 48 spans between the two slide rails 46 and is connected to the two slide rails 46 through two sliding blocks 47, respectively, and is connected to the transmission belt 42 at the middle position of the fixing plate 48. Thus, when the driving motor 41 drives the driving belt 42 to move, the fixing plate 48 can move along the sliding rail 46, so that when the foot is fixed on the foot fixing component 31 to move for performing flexion and extension exercises, the foot can be stably stressed and move smoothly.

Referring to fig. 1 and 3, further, the leg flexion and extension trainer 100 further includes a limiting mechanism, the limiting mechanism includes a first limiting member 51 and a second limiting member 52 disposed between the two slide rails 46, the first limiting member 51 and the second limiting member 52 respectively correspond to two end portions of the slide rails 46, and can limit the fixed plate 48 in a sliding manner. In this embodiment, the first limiting member 51 and the second limiting member 52 may be sensors, the sensors are in signal connection with the driving motor 41, and when the sensors sense that the fixing plate 48 approaches, the sensors send signals to the driving motor 41 to stop or reverse the rotation of the driving motor 41, so as to realize the stroke limiting during the flexion and extension training.

Further, stop gear still includes spacing axle 53 and stopper 54, first locating part 51 install in stopper 54, spacing axle 53 installs between two slide rails 46, and the length direction of spacing axle 53 is the same with the extending direction of two slide rails 46, and the one end of spacing axle 53 stretches out in base subassembly 10 to be connected with knob 531, and stopper 54 installs in spacing axle 53, and the part stretches out in the upper surface of base subassembly 10, and stopper 54 stretches out the part of base subassembly 10 and installs spacing pointer 541, and the upper surface of base subassembly 10 corresponds spacing pointer 541 and is equipped with the scale. In this embodiment, make the distance between first locating part 51 and the second locating part 52 adjustable through setting up spacing axle 53, stopper 54 and knob 531 to accessible spacing pointer 541 judges and controls the foot and stretches out the distance of removal with corresponding scale, and then judges and control the intensity that the shank bends and stretches, can adjust control training intensity to the patient of different situation, and it is more convenient to train the use.

In an embodiment of the present application, the foot fixing component 31 includes a connecting plate 311 and a foot support 312, the connecting plate 311 is connected to the fixing plate 48 and forms an included angle with the base component 10, the foot support 312 is disposed on one side of the connecting plate 311 facing the seat support component 20 and is used for fixing the foot of the human body.

In this embodiment, two opposite sides of the connecting plate 311 extend downward to form extending plates (not shown), two corresponding sides of the fixing plate 48 extend upward to form protruding plates (not shown), and the protruding plates are connected to the extending plates, so that after the connecting plate 311 is connected to the fixing plate 48, an included angle of approximately 90 ° is formed between the connecting plate 311 and the base assembly 10, and thus during training, the feet of the patient can be stably fixed on the foot support 312 for stable bending and stretching training. Moreover, after the feet are fixed, the included angle between the connecting plate 311 and the base component 10 can be matched with the included angle between the back of the human foot and the arm of the lower leg, so that the training process is more comfortable.

In addition, a foot strap 313 can be arranged on the foot support 312, the foot strap 313 can be a fastening belt, and the instep can be further fastened and fixed on the foot support 312 through the foot strap 313, so that the fixation of the foot is further enhanced.

Further, the connection between the connection plate 311 and the fixing plate 48 may be a rotation connection with an angle limitation, that is, the extension plate and the protruding plate are a rotation connection with a limitation, so that the foot fixing component 31 can be folded and stored above the base component 10 for transportation and carrying. In use, the connection plate 311 may be opened to a defined maximum angle for foot fixation.

With continued reference to fig. 1 and 2, in one embodiment, the limb fixation mechanism 30 further comprises a lower leg arm assembly 32 for fixing the lower leg of the human body and a upper leg arm assembly 33 for fixing the upper leg of the human body, wherein one end of the lower leg arm assembly 32 is hinged to the side of the connecting plate 311, the other end is hinged to the upper leg arm assembly 33, and one end of the upper leg arm assembly 33 away from the lower leg arm assembly 32 is hinged to the base assembly 10.

In this embodiment, each of the lower leg arm assembly 32 and the upper leg arm assembly 33 includes two oppositely disposed arms to be clamped on the left and right sides of the upper leg arm and the lower leg arm, respectively. The lower leg arm assembly 32 and the thigh arm assembly 33 are hinged to form a shape similar to an inverted V, wherein one end of the lower leg arm can be hinged to the extending plate extending from the two sides of the connecting plate 311, and the thigh arm can be hinged to the two sides of the base assembly 10, so that the thigh arm and the lower leg arm can be supported and pulled along with the bending and extending actions in the bending and extending training process, and the comfort in the training process is greatly improved.

Further, the lower leg arm assembly 32 and/or the upper leg arm assembly 33 are also provided with leg straps 34. Specifically, the leg strap 34 may also be a fastening strap capable of being folded and unfolded, and the leg strap 34 can bind and fix the thigh arm and the calf arm, so that the thigh and the calf can be better fixed.

In one embodiment of the present application, the base assembly 10 includes a housing 11 and a chassis 12, the chassis 12 is rotatably coupled to an end of the housing 11, the driving mechanism is installed in the housing 11, the seat assembly 20 is installed above the chassis 12, and the chassis 12 rotates relative to the housing 11 and can be accommodated and folded at the bottom of the housing 11.

Specifically, the chassis 11 includes a bottom plate 111 and a casing 112 covering the upper surface of the bottom plate 111, the bottom plate 111 and the casing 112 enclose to form a rectangular box structure, and the aforementioned driving motor 41, the driving belt 42 and the sliding rail 46 are all installed on the upper surface of the bottom plate 111 and located inside the box structure, so as to form a good protection. Gaps are formed on two opposite side walls of the housing 112, so that after the fixing plate 48 is connected with the transmission belt 42, two ends of the fixing plate 48 extend out through the gaps on two sides and extend upwards to form the convex plates for connecting the connecting plates 311. The base frame 12 is arranged in a rectangular frame structure, the base frame 12 can be rotatably connected with the case 11 through a rotating shaft, so that in the practical application process, the case 11 and the base frame 12 can be spread on the ground after being rotated and opened, the base frame 12 is used for supporting the seat rest component 20, and the case 11 is used for reciprocating the foot fixing component 31, so that the patient can keep the sitting and leaning posture to perform leg flexion and extension training; and the whole volume is reduced after the bottom frame 12 is rotated and folded, thereby being convenient for transportation and carrying.

Referring again to fig. 1 and 2, in the embodiment of the present application, the seat back assembly 20 includes a seat plate 21 and a back plate 22, the seat plate 21 is disposed at an end of the bottom frame 12 close to the case 11, the back plate 22 is disposed at a side of the seat plate 21 away from the case 11, and the seat plate 21 and the back plate 22 are disposed at an angle. Wherein, the seat plate 21 and the backrest plate 22 can be detachably connected and fixed on the base frame 12 so as to be conveniently disassembled and assembled. The included angle formed between the seat plate 21 and the backrest plate 22 can be an obtuse angle or a right angle, so that the seat plate 21 and the backrest plate 22 can form a seat leaning type, and the use is more comfortable. In this embodiment, in order to further improve the comfort of the patient in the sitting and leaning posture for performing flexion and extension training, flexible members, such as sponge, silica gel, rubber, cotton cloth, may be further disposed on the seat plate 21 and the backrest plate 22, so that the patient can achieve soft contact when contacting the seat plate 21 and the backrest plate 22, thereby improving the comfort. In addition, the seat plate 21 can be inclined downwards towards the backrest plate 22, so that the seat plate 21 forms a certain back inclination angle, and when a patient sits on the seat plate 21 for training, the body is not easy to slide forwards due to the bending and stretching of legs, and the convenience in use is further improved.

Further, in an embodiment, the backrest plate 22 is rotatably connected to the base frame 12 to adjust an included angle between the backrest plate 22 and the seat plate 21, and a support structure is further disposed between the backrest plate 22 and the base frame 12 for supporting and fixing the backrest plate 22 after rotation.

The backrest plate 22 may be rotatably connected to the base frame 12 through the hinge 13 and the folding rotating shaft 14, and the supporting structure may be an electrically controlled push rod or a pneumatically controlled cylinder, etc. to push the backrest plate 22 to rotate relative to the base frame 12 and to support and fix the backrest plate 22. Therefore, the size of the included angle between the backrest plate 22 and the seat plate 21 can be adjusted in the using process so as to meet the using requirements of different patients.

In an embodiment of the present application, the supporting structure includes an adjusting lever 61 and a plurality of limiting teeth 62 disposed on the bottom frame 12, the limiting teeth 62 are spaced apart along the length direction of the bottom frame 12, one end of the adjusting lever 61 is rotatably connected to the back portion of the back plate 22, and the other end of the adjusting lever is selectively engaged with one of the limiting teeth 62, so that the back plate 22 is fixed after rotating relative to the seat plate 21. The limiting tooth openings 62 can be symmetrically arranged on the bottom frame 12 to form two rows, the number of the limiting tooth openings 62 in each row is multiple, the limiting tooth openings 62 in the other row are transversely arranged in a one-to-one correspondence manner, and the clamping rods arranged transversely can be arranged at one end of the adjusting rod 61 far away from the back plate 22, so that when the back plate 22 is fixed after being rotated, the clamping rods can be clamped into the two rows of corresponding limiting tooth openings 62, and the adjusting rod 61 can be stably supported. In this way, the angle between the backrest plate 22 and the seat plate 21 can be adjusted by a mechanical structure without adjusting and supporting through an electric control device, so that the adjustment operation is convenient, and the cost is effectively saved. Meanwhile, as shown in fig. 4, when the base frame 12 is rotated and folded under the chassis 11, the back board 22 can be rotated and folded under the base frame 12 after the leveling adjustment rod 61 is rotated, and the limb fixing mechanism 30 is folded over the chassis 11, so as to realize the integral folding and storage of the leg flexion and extension trainer 100.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A leg flexion and extension trainer, characterized by comprising:

a base assembly;

a seat back assembly mounted to one end of the base assembly;

2. The leg flexion and extension trainer as claimed in claim 1, wherein the base assembly is provided with two parallel slide rails, the transmission belt is located between the two slide rails, the two slide rails extend in the same direction as the transmission direction of the transmission belt, each slide rail is provided with a slide block, the driving mechanism further comprises a fixing plate, the fixing plate is connected with the transmission belt and is slidably connected with the two slide rails through the slide blocks, and the foot fixing assembly is connected with the transmission belt through the fixing plate.

3. The leg flexion and extension trainer as claimed in claim 2, wherein the leg flexion and extension trainer further comprises a limiting mechanism, the limiting mechanism comprises a first limiting member and a second limiting member disposed between the two slide rails, the first limiting member and the second limiting member respectively correspond to two ends of the slide rails and can limit the fixed plate in a sliding manner.

4. The leg flexion and extension trainer as claimed in claim 3, wherein the limiting mechanism further comprises a limiting shaft and a limiting block, the first limiting member is mounted on the limiting block, the limiting shaft is mounted between the two slide rails, the length direction of the limiting shaft is the same as the extending direction of the two slide rails, one end of the limiting shaft extends out of the base assembly and is connected with a knob, the limiting block is mounted on the limiting shaft and partially extends out of the upper surface of the base assembly, a limiting pointer is mounted on the portion of the limiting block extending out of the base assembly, and the upper surface of the base assembly is provided with a scale corresponding to the limiting pointer.

5. The leg flexion and extension training aid as claimed in claim 2, wherein the foot fixing member comprises a connecting plate and a foot rest, the connecting plate is connected to the fixing plate and disposed at an angle to the base member, and the foot rest is disposed on a side of the connecting plate facing the seat assembly and used for fixing the foot of the human body.

6. The leg flexion and extension training device as claimed in claim 5, wherein the limb fixation mechanism further comprises a lower leg arm assembly for fixing the lower leg of the human body and a thigh arm assembly for fixing the thigh of the human body, one end of the lower leg arm assembly is hinged to the side of the connecting plate, the other end of the lower leg arm assembly is hinged to the thigh arm assembly, and the end of the thigh arm assembly, which is far away from the lower leg arm assembly, is hinged to the base assembly.

7. Leg flexion and extension training aid according to claim 6, characterised in that the lower leg arm assembly and/or the upper leg arm assembly is provided with a leg strap.

8. The leg flexion and extension trainer according to any one of claims 1 to 4, wherein the base assembly comprises a chassis rotatably coupled to one end of the chassis, the drive mechanism being mounted within the chassis, the seat assembly being mounted above the chassis, the chassis being rotatable relative to the chassis and being stowable folded against the bottom of the chassis.

9. The leg flexion and extension training device as claimed in claim 8, wherein the seat back assembly comprises a seat plate and a back plate, the seat plate is disposed at one end of the bottom frame close to the case, the back plate is disposed at a side of the seat plate away from the case, and the seat plate and the back plate are disposed at an included angle.

10. The leg flexion and extension trainer as claimed in claim 9, wherein the backrest plate is pivotally connected to the base frame to adjust the angle between the backrest plate and the seat plate, and a support structure is provided between the backrest plate and the base frame for supporting and fixing the backrest plate.