Folding wheelchair

Abstract

A main body of the folding wheelchair is of a vertical folding structure, the folding wheelchair can be folded without bending down, and the folding wheelchair can be conveniently used by old people and other people who have difficulty in moving and particularly have waist discomfort. The folding wheelchair comprises a folding mechanism, a seat plate frame body and a locking mechanism. Wherein the folding mechanism comprises a front arm frame body and a rear arm frame body which are rotationally connected, the front arm frame body comprises a front arm and a connecting arm, a first included angle is formed between the front arm and the connecting arm, the rear arm frame body is provided with a first end and a second end, and the first end is connected to the joint of the front arm and the connecting arm; the seat plate frame body is fixedly mounted on the connecting arm; the locking mechanism is used for limiting rotation of the rear arm support body relative to the front arm support body, the locking mechanism comprises an unlocking pedal and a limiting assembly, the unlocking pedal is located at the second end, the limiting assembly is installed between the front arm support body and the rear arm support body, and the unlocking pedal is used for unlocking the limiting assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wheelchairs, in particular to a folding wheelchair. BACKGROUND

[0002] A wheelchair is a tool to help people with physical disabilities walk. In order to facilitate transportation and carrying, the wheelchair on the market adopts a folding design, which can change the size of the wheelchair to facilitate storage or transportation. The existing folding wheelchair, for example, Chinese patents CN120392440A and CN120501596A, adopts a horizontal folding structure. When folding the main frame of the wheelchair, it is necessary to bend over to operate, which reduces the height of the wheelchair. Such lifting and folding structure is not convenient for the operation of the elderly and people with limited mobility. SUMMARY

[0003] The folding wheelchair provided by the present application adopts a vertical folding mechanism, which can be operated without bending over, solving the problem of inconvenient operation of the folding wheelchair when folding.

[0004] The folding wheelchair provided by the embodiment of the present application comprises a folding mechanism, a seat plate frame body and a locking mechanism. The folding mechanism comprises a front arm frame body and a rear arm frame body connected by rotation, the front arm frame body comprises a front arm and a connecting arm, the front arm and the connecting arm have a first included angle, the rear arm frame body has a first end and a second end, the first end is connected to the junction of the front arm and the connecting arm; the seat plate frame body is fixedly installed on the connecting arm; the locking mechanism is used to limit the rotation of the rear arm frame body relative to the front arm frame body, and the locking mechanism comprises an unlocking pedal and a limiting component, the unlocking pedal is located at the second end, and the limiting component is installed between the front arm frame body and the rear arm frame body, and the unlocking pedal is used to unlock the limiting component.

[0005] In the above embodiment, the folding mechanism is the main frame of the folding wheelchair, which comprises two groups of front arm frame bodies and rear arm frame bodies symmetrically arranged on both sides of the seat plate frame body. When the wheelchair is opened, the rear arm frame body has a first preset included angle with the front arm, and the limiting component can lock the rear arm frame body relative to the front arm frame body, so that the first preset included angle remains fixed, thereby keeping the folding wheelchair stable when opened and improving the safety of the user. When the user steps on the unlocking pedal, the limiting component is unlocked, and the rear arm frame body can rotate freely relative to the front arm. After unlocking, continue to step on the pedal and apply force forward, so that the rear arm frame body approaches the front arm to realize the folding of the main frame, and at the same time, the front arm frame body drives the seat plate frame body to turn over forward, and the folding wheelchair is contracted forward and backward. When the rear arm frame body and the front arm reach a relative preset position, the unlocking pedal is released, so that the rear arm frame body and the front arm maintain a second preset included angle, and the folding of the main frame is completed. The whole operation does not need to be operated by bending over, but only needs to hold the folding wheelchair and kick forward with one foot to complete the folding of the main frame, which is convenient to operate.

[0006] In an embodiment, the limiting assembly comprises a locking pin and a limiting ring, the limiting ring has at least two clamping holes, the locking pin is inserted into different clamping holes to adjust the included angle between the rear arm frame body and the front arm.

[0007] In an embodiment, the locking mechanism further comprises a pull rope, one end of the pull rope is connected to the unlocking pedal and the other end is connected to the locking pin.

[0008] In an embodiment, the front arm frame body is provided with a mounting cavity, the limiting ring is fixedly installed in the mounting cavity, the mounting cavity is a cylindrical cavity, and the limiting ring is coaxially arranged with the mounting cavity.

[0009] In an embodiment, the circumferential side wall of the mounting cavity is provided with a avoiding hole, the avoiding hole is used for avoiding the locking pin.

[0010] In an embodiment, the clamping holes are arranged on the circumferential outer wall of the limiting ring, and the vertical projection of the limiting ring completely covers the at least two clamping holes.

[0011] In an embodiment, the front arm frame body is provided with a limiting groove, and the rear arm frame body is installed in the limiting groove. The limiting groove is used for limiting the rotation angle of the rear arm frame body.

[0012] In an embodiment, the rear arm frame body is provided with a guide structure, the limiting assembly comprises a locking pin, and the locking pin is arranged in the guide structure.

[0013] In an embodiment, the limiting assembly further comprises a limiting ring, one end of the locking pin away from the limiting ring is provided with a boss, and the boss abuts against the outer side wall of the guide structure to limit the movement range of the locking pin.

[0014] In an embodiment, the pull rope is fixed to the rear arm frame body through a connecting piece, the connecting piece is spaced apart from the guide structure by a preset distance, the locking mechanism further comprises a reset member, the reset member is sleeved outside the pull rope and located between the boss and the connecting piece, and the reset member is used for driving the locking pin to be close to the limiting ring.

[0015] In an embodiment, the front arm frame body is provided with a cylindrical mounting cavity, one side of the guide structure towards the mounting cavity has an arc surface, and the arc surface is coaxially arranged with the cylindrical mounting cavity.

[0016] In an embodiment, the folding wheelchair further comprises an armrest, the armrest is rotationally connected to the connecting arm, the armrest comprises an armrest body and a connecting rod, the armrest body and the connecting rod have a second included angle, and the first included angle is equal to the second included angle.

[0017] In one embodiment, the folding wheelchair further comprises a backrest pivotally connected to the seat plate frame. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structure diagram of the folding wheelchair in an unfolded state according to one embodiment of the present application;

[0019] Figure 2 An assembly diagram of the folding mechanism, locking mechanism and armrest according to one embodiment of the present application;

[0020] Figure 3 A partial assembly diagram of the folding mechanism and locking mechanism according to one embodiment of the present application;

[0021] Figure 4 An exploded diagram of the forearm frame and locking mechanism according to another embodiment of the present application;

[0022] Figure 5 An exploded diagram of the forearm frame, rear arm frame and locking mechanism according to one embodiment of the present application;

[0023] Figure 6 A structure diagram of the limiting ring according to one embodiment of the present application;

[0024] Figure 7 An assembly diagram of the unlocking pedal, pedal body and connecting rod according to one embodiment of the present application;

[0025] Figure 8 An assembly sectional view of the locking mechanism, forearm frame and rear arm frame according to one embodiment of the present application;

[0026] Figure 9 A partial structure diagram of the folding wheelchair in an unfolded state according to one embodiment of the present application;

[0027] Figure 10 A structure diagram of the button assembly, connecting rod and connecting arm when the button is in the first position according to one embodiment of the present application;

[0028] Figure 11 A structure diagram of the button assembly, connecting rod and connecting arm when the button is in the second position according to one embodiment of the present application;

[0029] Figure 12 A structure diagram of the armrest according to one embodiment of the present application;

[0030] Figure 13 A structure diagram of the button assembly, connecting rod and connecting arm when the button is in the first position according to another embodiment of the present application;

[0031] Figure 14 An assembly view of the armrest and connecting arm is provided for one embodiment of the present application;

[0032] Figure 15 An exploded view of the armrest, forearm bracket, and button assembly is provided for one embodiment of the present application;

[0033] Figure 16 A structural view of the backrest, backrest locking mechanism, and seat pan bracket is provided for one embodiment of the present application;

[0034] Figure 17 An assembly view of the locking hook assembly and the catch assembly in the locked state is provided for one embodiment of the present application;

[0035] Figure 18 An assembly view of the locking hook assembly and the catch assembly in the unlocked state is provided for one embodiment of the present application;

[0036] Figure 19 An exploded view of the locking hook assembly and the catch assembly is provided for one embodiment of the present application;

[0037] Figure 20 A structural view of the locking hook is provided for one embodiment of the present application;

[0038] Figure 21 A structural view of the locking hook mounting base is provided for one embodiment of the present application;

[0039] Figure 22 A partial cutaway view of the backrest folding locking mechanism is provided for one embodiment of the present application;

[0040] Figure 23 A front view of the locking hook assembly is provided for one embodiment of the present application;

[0041] Figure 24A A partial cutaway side view of the backrest locking mechanism when the backrest is in the fully folded state is provided for one embodiment of the present application;

[0042] Figure 24B A partial cutaway side view of the backrest locking mechanism when the backrest is in the half folded state is provided for one embodiment of the present application;

[0043] Figure 24C A partial cutaway side view of the backrest locking mechanism when the backrest is in the fully unfolded state is provided for one embodiment of the present application;

[0044] Figure 25 A structural view of the folding wheelchair in the folded state is provided for one embodiment of the present application.

[0045] Reference Signs:

[0046] 1 - base frame body; 11 - L-shaped support; 12 - frame;

[0047] 2 - locking mechanism; 21 - unlocking pedal; 211 - pedal body; 212 - connecting rod; 22 - lock pin; 221 - boss; 23 - limiting ring; 231 - clamping hole; 24 - pull rope; 25 - mounting bracket; 26 - reset member;

[0048] 3 - forearm frame body; 31 - forearm; 32 - connecting arm; 321 - second mounting hole; 322 - movable pin avoiding hole; 323 - fixed pin; 33 - limiting groove; 331 - front end surface; 332 - rear end surface;

[0049] 4 - rear arm frame body; 41 - first end; 42 - second end; 43 - guide structure; 431 - guide hole; 432 - arc surface; 44 - connecting piece;

[0050] 5 - cross beam;

[0051] 6 - mounting cavity; 61 - avoiding hole;

[0052] 7 - main shaft;

[0053] 8 - armrest; 81 - armrest body; 82 - connecting rod; 821 - first mounting hole; 8211 - second flange; 822 - first limiting guide groove; 823 - second limiting guide groove;

[0054] 83 - button assembly; 831 - button; 832 - fixed shaft; 8321 - first flange; 8322 - step structure; 833 - reset spring; 834 - locking nut; 835 - compression gasket; 836 - wave-shaped elastic sheet; 837 - first lubricating member; 838 - second lubricating member; 8381 - shaft sleeve part; 8382 - gasket part;

[0055] 84 - button connecting piece; 841 - connecting rod; 842 - movable pin; 843 - connecting plate;

[0056] 9 - backrest; 91 - mounting plate; 92 - leaning part; 93 - mounting part; 94 - backrest rotation shaft;

[0057] 10 - backrest locking mechanism; 101 - lock hook assembly; 111 - pull rod; 1112 - limiting block; 112 - first lock hook assembly; 113 - second lock hook assembly; 1121 - lock hook; 11211 - third mounting hole; 11212 - fourth mounting hole; 11213 - hook part; 2131 - arc-shaped guide surface; 11214 - lock hook connecting part; 2141 - first connecting plate; 2142 - second connecting plate; 1122 - elastic member; 11221 - first part; 11222 - second part;

[0058] 103 - hook connecting piece; 1031 - hook mounting base; 10311 - clamping block; 1032 - hook pin;

[0059] 102 - blocking buckle assembly; 1021 - blocking buckle mounting base; 1022 - blocking pin;

[0060] 104 - hook reset piece. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of the present application clearer, the following further describes the present application with examples in conjunction with the accompanying drawings.

[0062] The terms used in the following examples are only for the purpose of describing specific examples and are not intended to be limiting of the present application. As used in the specification and the appended claims, the singular forms "a," "an" and "the" are intended to include both singular and plural forms, unless the context clearly indicates otherwise.

[0063] Reference in the specification to "one embodiment" or "an embodiment" or "the specific embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The terms "including," "comprising," "having" and variations thereof are meant to be open-ended terms that do not exclude additional, unrecited elements.

[0064] With the acceleration of the aging process of the population, China is facing an unprecedented super-aging challenge. The intensification of aging has increased the demand for wheelchairs. In addition, people with difficulty in moving also need to use wheelchairs for walking. Folding wheelchairs, with their lightness and easy folding characteristics, are widely used in various life scenarios to meet the travel needs of different groups of people, including the elderly. Application scenarios include home scenarios, care scenarios, shopping scenarios, medical scenarios, etc. And the folding wheelchair has a small volume after folding, which can be easily put into the trunk of a car or a public transportation tool.

[0065] In the related art, folding wheelchairs usually adopt a lying type folding manner, and the volume of the wheelchair is reduced by changing the height of the wheelchair. The folding mechanism is the main frame of the folding wheelchair, and the volume of the wheelchair can be greatly reduced after folding the main frame. The folding mechanism of the lying type folding wheelchair is a scissors type folding mechanism that intersects with each other, and the folding mechanism below the seat plate frame body is contracted towards the ground by pressing the seat plate frame body. This operation requires the user to bend down and press the seat plate frame body to fold the wheelchair, which is inconvenient for the elderly and other people with difficulty in moving, especially those with waist discomfort.

[0066] In view of this, embodiments of this application provide a folding wheelchair with a vertical folding structure, which can be folded without bending over, making it convenient for the elderly and other people with mobility impairments, especially those with back discomfort.

[0067] like Figures 1 to 3 As shown, the folding wheelchair provided in the embodiments of this application includes a folding mechanism, a seat frame 1, and a locking mechanism 2. The folding mechanism includes a forearm frame 3 and a rear arm frame 4 rotatably connected. The forearm frame 3 includes a forearm 31 and a connecting arm 32, which have a first included angle. The rear arm frame 4 has a first end 41 and a second end 42, with the first end 41 connected to the junction of the forearm 31 and the connecting arm 32. The seat frame 1 is fixedly mounted to the connecting arm 32. The locking mechanism 2 restricts the rotation of the rear arm frame 4 relative to the forearm frame 3. The locking mechanism 2 includes an unlocking pedal 21 and a limiting assembly. The unlocking pedal 21 is located at the second end 42, and the limiting assembly is installed between the forearm frame 3 and the rear arm frame 4. The unlocking pedal 21 is used to unlock the limiting assembly.

[0068] In the above embodiment, the folding mechanism is the main frame of the folding wheelchair, which includes two sets of forearm frames 3 and rear arm frames 4 symmetrically arranged on both sides of the seat frame 1. When the wheelchair is opened, the rear arm frame 4 and the forearm 31 have a first preset angle. The limiting component can lock the rear arm frame 4 relative to the forearm frame 3, keeping the first preset angle fixed, thereby making the folding wheelchair stable when opened and improving the safety of the user. When the user steps on the unlocking pedal 21, the limiting component unlocks, and the rear arm frame 4 can rotate freely relative to the forearm 31. After unlocking, continuing to step on the pedal and applying forward force causes the rear arm frame 4 to move closer to the forearm 31, realizing the folding of the main frame. At the same time, the forearm frame 3 drives the seat frame 1 to flip forward, and the folding wheelchair retracts back and forth. When the rear arm frame 4 and the forearm 31 reach a relative preset position, the unlocking pedal 21 is released, keeping the rear arm frame 4 and the forearm 31 at a second preset angle, completing the folding of the main frame. The entire operation does not require bending over. Simply hold the folding wheelchair and step on the unlock pedal 21 with one foot to kick forward to complete the folding of the main frame. It is easy to operate.

[0069] In one embodiment, the forearm 31 and the connecting arm 32 have a first included angle, which can be an obtuse angle, allowing the rear arm frame 4 to move within the space formed by the first included angle. The obtuse angle makes this space larger, thereby allowing the rear arm frame 4 to have a larger adjustment range.

[0070] The rear wheel is mounted on the second end 42 of the rear boom frame 4, and the front wheel is mounted on the end of the forearm 31 away from the connecting arm 32. When folding, the rear wheel moves closer to the front wheel.

[0071] like Figure 4As shown, in a further embodiment, the front arm body 3 is provided with a limiting slot 33, and the rear arm body 4 is installed in the limiting slot 33. The limiting slot 33 is used to limit the rotation angle of the rear arm body 4. Specifically, the limiting slot 33 is located at the joint of the front arm 31 and the connecting arm 32. The front end surface 331 of the limiting slot 33 is in the same plane as the rear side surface of the front arm 31, and the front end surface 331 is smoothly connected with the front arm 31. When the rear arm body 4 rotates away from the front arm 31, it is limited when abutting against the rear end surface 332 of the limiting slot 33.

[0072] In an embodiment, the seat plate body 1 tends to be parallel to the connecting arm 32. The seat plate body 1 is used to install the seat cushion. When the folding wheelchair is unfolded, the connecting arm 32 and the seat plate body 1 tend to be parallel to the ground.

[0073] In combination Figures 4 to 6 In an embodiment, the limiting assembly includes a locking pin 22 and a limiting ring 23, and the limiting ring 23 has at least two clamping holes 231, and the locking pin 22 is inserted into different clamping holes 231 to adjust the included angle between the rear arm body 4 and the front arm 31. Specifically, the limiting ring 23 is fixedly connected with the front arm body 3, the clamping holes 231 are arranged on the circumferential outer wall of the limiting ring 23, and at least two clamping holes 231 are arranged at intervals. The position of the clamping hole 231 determines the angle of the first preset included angle and the second preset included angle between the rear arm body 4 and the front arm 31. The locking pin 22 is installed on the rear arm body 4, and the extension direction of the locking pin 22 is consistent with the extension direction of the rear arm body 4.

[0074] In other embodiments, the limiting ring 23 can be provided with multiple clamping holes 231, such as three or four, which are not limited in the present application. Multiple clamping holes 231 realize the gear adjustment of the rear arm body 4, so as to adjust the distance of the seat plate body 1 relative to the ground to meet the needs of users of different heights.

[0075] The above-mentioned first preset included angle can be the maximum unfolding angle of the rear arm body 4. When the rear arm body 4 abuts against the rear end surface 332 of the limiting slot 33, the rear arm body 4 can be in the maximum unfolding angle position relative to the front arm 31, and the locking pin 22 corresponds to the position of the last clamping hole 231. After the unlocking pedal 21 is loosened, the locking pin 22 is inserted into the clamping hole 231, and the unfolding of the folding seat at the maximum angle is completed.

[0076] In an embodiment, the locking mechanism 2 further includes a pull rope 24, one end of the pull rope 24 is connected with the unlocking pedal 21, and the other end of the pull rope 24 is connected with the locking pin 22. Specifically, the unlocking pedal 21 can be installed on the second end 42 of the rear arm body 4 through a mounting bracket 25, and the unlocking pedal 21 is rotationally connected with the mounting bracket 25 through a rotating shaft, and the axial direction of the rotating shaft of the unlocking pedal 21 is the same as the axial direction of the rotating shaft of the rear arm body 4. As shown in the figure, the pull rope 24 is connected with the locking pin 22 through a connecting rod 26, and the other end of the pull rope 24 is connected with the locking pin 22. Figure 7As shown, the unlocking pedal 21 comprises a pedal body 211 and a connecting rod 212 connected with each other, and a rotating shaft is arranged between the pedal body 211 and the connecting rod 212. When the pedal body 211 is stepped on, the pedal body 211 drives the connecting rod 212 to overturn backward, thereby driving the pull rope 24 to move. Under the driving of the pull rope 24, the locking pin 22 moves away from the clamping hole 231. A protective sleeve can be arranged outside the pull rope 24, the pull rope 24 is arranged in the protective sleeve and can move in the protective sleeve. The protective sleeve is fixedly installed on the inner side of the rear arm frame body 4, and an end of the protective sleeve close to the locking pin 22 is provided with a connecting piece 44 for fixing the protective sleeve and the pull rope 24 to the rear arm frame body 4. An end of the protective sleeve close to the unlocking pedal 21 is fixed to the mounting frame 25. When the unlocking pedal 21 overturns, the pull rope 24 is driven to move, and the protective sleeve remains stationary. The pull rope 24 is flexible, and the protective sleeve can be made of flexible or rigid material. The locking pin 22 is spaced apart from the connecting piece 44 by a preset distance, and the pull rope 24 between the locking pin 22 and the connecting piece 44 is not provided with a protective sleeve, so as to leave a movement space for the locking pin 22.

[0077] As shown in the drawings, Figure 8 In an embodiment, the locking pin 22 can be a wedge-shaped locking pin, and the axial section of the wedge-shaped locking pin is trapezoidal. Compared with a cylindrical locking pin, the wedge-shaped locking pin has higher structural strength. Moreover, the wedge-shaped locking pin can form a close physical locking effect with the clamping hole, effectively fill the gap between the locking pin 22 and the clamping hole 231, and enhance the stability of the connection.

[0078] As shown in the drawings, Figure 9 In an embodiment, the folding wheelchair can further comprise a cross beam 5 fixedly installed between the two rear arm frame bodies 4 and located at the second end 42 connected to the rear arm frame body 4. The cross beam 5 can improve the stability of the folding wheelchair structure, and the mounting frame 25 can also be fixedly installed on the cross beam 5.

[0079] As shown in the drawings, Figures 3 to 5 In an embodiment, the front arm frame body 3 is provided with a mounting cavity 6 which can be arranged on the inner side of the front arm frame body 3. The limiting ring 23 is fixedly installed in the mounting cavity 6, and the mounting cavity 6 is a cylindrical cavity, and the limiting ring 23 is coaxially arranged in the mounting cavity 6. A through hole is arranged at the center of the limiting ring 23, and a through hole is also arranged at the center of the mounting cavity 6, and the two through holes are coaxially arranged. The first end 41 of the rear arm frame body 4 is also provided with a through hole. The folding mechanism further comprises a main shaft 7 which is arranged in the through holes of the rear arm frame body 4, the mounting cavity 6 and the limiting ring 23.

[0080] When the rear arm frame body 4 rotates, the locking pin 22 rotates together, so that the locking pin 22 can be inserted into different card holes 231 from different angles. In an embodiment, the circumferential side wall of the mounting cavity 6 is provided with an avoiding hole 61 for avoiding the locking pin 22. The avoiding hole 61 enables the locking pin 22 to pass through the side wall of the mounting cavity 6 and be inserted into the card hole 231. In this embodiment, the avoiding hole 61 can be a circular hole (not shown in the figure), and the card hole 231 is also a circular hole. The positions of the avoiding hole 61 and the card hole 231 correspond to each other one by one.

[0081] In another embodiment, the avoiding hole 61 extends along the circumference of the mounting cavity 6 to form an elongated hole, and the avoiding hole 61 completely covers at least two card holes 231 in the vertical projection of the limiting ring 23, that is, covers all the card holes 231, so that all the card holes 231 can be exposed through the avoiding hole 61, so that the locking pin 22 can be inserted into the card hole 231. Compared with the circular hole in the above-mentioned embodiment, the elongated hole in this embodiment can weaken the misalignment of the avoiding hole 61 and the card hole 231 caused by the assembly error of the limiting ring 23 and the mounting cavity 6, which leads to the situation that the locking pin 22 cannot be inserted into the card hole 231, and it avoids the trouble of assembling the avoiding hole 61 and the card hole 231 one by one, and improves the convenience of assembly.

[0082] As shown in Figure 8 In an embodiment, the rear arm frame body 4 is provided with a guide structure 43, which has a guide hole 431, and the locking pin 22 is arranged in the guide hole 431 and can slide along the extension direction of the guide hole 431. The extension line of the axis of the guide hole 431 intersects the extension line of the main shaft 7 within the allowable error range. The guide structure 43 can play a role in fixing and guiding the locking pin 22. Specifically, the guide structure 43 is arranged on the inner side of the rear arm frame body 4, the rear arm frame body 4 is mounted on the outer side of the front arm frame body 3, and the guide structure 43 is located on the outer periphery of the mounting cavity 6.

[0083] In an embodiment, the side of the guide structure 43 facing the mounting cavity 6 has an arc surface 432, and the curvature of the arc surface 432 is consistent with the curvature of the outer wall of the mounting cavity 6. The arc surface 432 is arranged on the same axis as the cylindrical mounting cavity 6.

[0084] It is worth noting that during assembly, the arc surface 432 can be in contact with the outer wall of the mounting cavity 6, or there can be a gap between the arc surface 432 and the outer wall of the mounting cavity 6.

[0085] In an embodiment, the end of the locking pin 22 away from the limiting ring 23 is provided with a boss 221, and the boss 221 abuts against the outer side wall of the side of the guide structure 43 away from the mounting cavity 6. The boss 221 can limit the movement range of the locking pin 22, so as to avoid the damage of the limiting ring 23 caused by the impact of the locking pin 22 on the card hole 231.

[0086] In an embodiment, the locking mechanism 2 further comprises a reset member 26, which is sleeved on the pull rope 24 and located between the boss 221 and the connecting member 44. The pull rope 24 between the boss 221 and the connecting member 44 is not provided with a protective sleeve, and the reset member 26 is located outside the segment of the pull rope 24 which is not provided with the protective sleeve. The connecting member 44 is spaced apart from the guide structure 43 by a preset distance along the extension direction of the rear arm frame 4. The reset member 26 is used to drive the locking pin 22 to be close to the limiting ring 23. Specifically, the reset member 26 can be a spring, one end of the spring is in abutment with the connecting member 44, and the other end is in abutment with the boss 221 of the locking pin 22. When the unlocking pedal 21 is stepped on, the pull rope 24 drives the locking pin 22 to be away from the guide structure 43, so that the locking pin 22 is close to the connecting member 44, and thus the spring is compressed. When the unlocking pedal 21 is released, the spring is released to drive the locking pin 22 to be close to the guide structure 43.

[0087] When the boss 221 of the locking pin 22 is in abutment with the guide structure 43, the spring has a pre-tightening force, which can always provide a pushing force for the locking pin 22 to make the boss 221 abut against the guide structure 43, thereby avoiding the locking pin 22 from falling off the guide structure 43.

[0088] Continuing to refer to Figure 1 In an embodiment, the folding wheelchair further comprises an armrest 8 and a backrest 9, the armrest 8 is rotationally connected to the connecting arm 32. The armrest 8 comprises an armrest body 81 and a connecting rod 82, the armrest body 81 and the connecting rod 82 have a second included angle, which is equal to the first included angle of the front arm frame 3. In this way, when the armrest 8 is folded, the armrest body 81 is parallel to the front arm 31, and the connecting rod 82 is parallel to the connecting arm 32. This can effectively reduce the occupied space of the armrest 8 when the wheelchair is folded. The backrest 9 is rotationally connected to the rear end of the seat plate frame 1. The backrest 9 can be folded forward to be close to the seat plate frame 1. The folded backrest 9 is attached to the seat plate frame 1, thereby reducing the volume of the folded wheelchair.

[0089] As shown in Figures 10 to 12 , the specific structure of the armrest 8 will be introduced below.

[0090] As shown in Figure 10 , the end of the connecting rod 82 away from the armrest body 81 is provided with a first mounting hole 821 and a first limiting guide slot 822, and the first limiting guide slot 822 is arranged on the side of the connecting rod 82 facing the connecting arm 32. The first mounting hole 821 is provided with a button assembly 83, and the button assembly 83 comprises a button 831 and a button connecting member 84. The connecting arm 32 is provided with a second mounting hole 321 and a movable pin avoiding hole 322. The button connecting member 84 has a connecting rod 841 and a movable pin 842, the connecting rod 841 is arranged in the second mounting hole 321 and connected with the button 831, and the movable pin 842 is arranged in the movable pin avoiding hole 322.

[0091] In combination with Figure 10 , Figure 11 andFigure 12 The button 831 is used to drive the button connecting piece 84 to move close to or away from the armrest 8. The button 831 can move close to or away from the connecting arm 32 along the axial direction of the connecting rod 841. When the button 831 is in the first position A, which can be regarded as the initial position of the button 831, the movable pin 842 is inserted into the first limiting guide slot 822 and can slide along the first limiting guide slot 822 around the connecting rod 841, and the first limiting guide slot 822 is used to limit the rotation angle of the armrest 8. When the button 831 is pressed to move to the second position B, the button 831 drives the connecting rod 841 to move away from the armrest 8, so that the movable pin 842 is disengaged from the first limiting guide slot 822, and the rotation of the armrest 8 is not limited at this time. The above-mentioned first position A and second position B are arranged along the axial direction of the connecting rod 841.

[0092] When the button 831 is in the first position A, the movable pin 842 can slide along the first limiting guide slot 822, so that the armrest 8 is rotated upward to the position close to the backrest 9 to increase the space between the armrest 8 and the connecting arm 32, thereby facilitating the user to get on and off the wheelchair. After the user sits down, the armrest 8 is adjusted to the appropriate angle in the reverse direction to provide support to the user's arms. When it is needed to fold the armrest 8, the button 831 is pressed to move to the second position B, so that the movable pin 842 is disengaged from the first limiting guide slot 822, and the armrest 8 can be freely rotated relative to the bracket. The user can adjust the position of the armrest 8 according to the needs, for example, the armrest 8 is rotated downward to the position where the connecting rod 82 and the connecting arm 32 tend to be parallel, and the armrest body 81 and the front arm 31 tend to be parallel, so that the armrest 8 occupies a smaller space. The button assembly 83 is arranged in the first mounting hole 821 and the second mounting hole 321, which realizes hidden installation and does not occupy additional space.

[0093] As shown in Figure 13 , the side of the armrest 8 facing the connecting arm 32 is also provided with a second limiting guide slot 823, and the connecting arm 32 is provided with a fixed pin 323, which is inserted into the second limiting guide slot 823, and the second limiting guide slot 823 is used to limit the rotation angle of the armrest 8. Specifically, the fixed pin 323 can be arranged on the side of the second mounting hole 321 away from the movable pin avoiding hole 322. Correspondingly, the second limiting guide slot 823 can be arranged on the side of the first mounting hole 821 away from the first limiting guide slot 822. Since the fixed pin 323 is fixedly connected with the connecting arm 32, even if the button 831 is pressed, the fixed pin 323 will not be disengaged from the second limiting guide slot 823. The fixed pin 323 and the second limiting guide slot 823 limit the rotation range of the armrest 8, so as to avoid interference between the armrest 8 and other parts of the folding wheelchair when the armrest 8 is rotated too much.

[0094] Continuing to refer to Figure 12In a specific embodiment, the first limiting guide slot 822 and the second limiting guide slot 823 are both arc-shaped slots. The arc length of the second limiting guide slot 823 is greater than that of the first limiting guide slot 822, so that the armrest 8 has a larger range of movement when folded. The first limiting guide slot 822 limits the fine adjustment of the angle of the armrest 8, and the second limiting guide slot 823 limits the folding of the armrest 8.

[0095] The first limiting guide slot 822 and the second limiting guide slot 823 are both located on the circumferential side of the first mounting hole 821. The center of the sector plane where the first limiting guide slot 822 is located overlaps with the center of the sector plane where the second limiting guide slot 823 is located, and both centers overlap with the center of the first mounting hole 821. The first mounting hole 821 is coaxially arranged with the second mounting hole 321, and the first limiting guide slot 822 and the second limiting guide slot 823 are arranged around the first mounting hole 821.

[0096] Continuing to refer to Figure 13 , the button connecting piece 84 also has a connecting plate 843, and the connecting rod 841 and the movable pin 842 are arranged on the same side of the connecting plate 843, so that the connecting plate 843 is generally U-shaped. The connecting plate 843 is arranged on the side of the connecting arm 32 away from the armrest 8, and the connecting plate 843 enables the movable pin 842 to move together with the connecting rod 841. Moreover, the connecting plate 843 is thin in structure, and when the button 831 is in the second position B, the connecting plate 843 moves away from the connecting arm 32 without occupying a large space.

[0097] As shown in Figure 14 and Figure 15 , in an embodiment, the button assembly 83 further includes a fixed shaft 832 and a return spring 833. One end of the fixed shaft 832 is fixedly installed in the second mounting hole 321, and the other end penetrates the first mounting hole 821. The fixed shaft 832 has a shaft hole, and the connecting rod 841 penetrates the shaft hole. The fixed shaft 832 can provide a guide function for the connecting rod 841, enabling it to move in a straight line. The inner wall of the shaft hole is provided with a first flange 8321, the return spring 833 is sleeved on the outer wall of the connecting rod 841, and one end of the return spring 833 abuts against the first flange 8321 and the other end abuts against the button 831. The return spring 833 is used to drive the button 831 away from the connecting arm 32, so as to reset the button connecting piece 84 and the button 831.

[0098] In an embodiment, the button assembly 83 further comprises a locking nut 834, a compression washer 835 and at least one wave spring 836 arranged along the axial direction of the connecting rod 841 in sequence, the locking nut 834, the compression washer 835 and the at least one wave spring 836 are sleeved on the outer wall of the fixed shaft 832, the first mounting hole 821 is provided with a second flange 8211, and the at least one wave spring 836 abuts against the second flange 8211. The locking nut 834 and the compression washer 835 are used for fixing the wave spring 836, and the wave spring 836 plays a damping role, so that the armrest 8 has a certain resistance when rotating, thereby facilitating the user to find a suitable angle position.

[0099] In an embodiment, the outer wall of the fixed shaft 832 away from the one end of the connecting arm is provided with a stepped structure 8322, and the outer diameter of the stepped structure 8322 is smaller than the diameter of the fixed shaft 832. The locking nut 834 and the compression washer 835 are installed on the stepped structure 8322, and the locking nut 834 is used for locking the compression washer 835 on the stepped structure 8322, so as to avoid the sliding of the compression washer 835.

[0100] In an embodiment, the button assembly 83 further comprises a first lubricating part 837, the first lubricating part 837 is sleeved on the outer wall of the fixed shaft 832, and the first lubricating part 837 is arranged between the second flange 8211 and the at least one wave spring 836. The first lubricating part 837 is used for reducing the friction between the wave spring 836 and the armrest 8, so that the armrest 8 rotates more smoothly.

[0101] In an embodiment, the button assembly 83 further comprises a second lubricating part 838, the second lubricating part 838 is sleeved on the outer wall of the fixed shaft 832, and the second lubricating part 838 comprises a sleeve part 8381 and a washer part 8382 which are connected perpendicularly to each other, the sleeve part 8381 is located between the fixed shaft 832 and the inner wall of the first mounting hole 821, and the washer part 8382 is located between the connecting rod 82 and the connecting arm 32. The second lubricating part 838 is used for reducing the friction between the armrest 8 and the connecting arm 32, and the friction between the armrest 8 and the fixed shaft 832, so that the armrest 8 rotates more smoothly.

[0102] As shown in FIG. 1, Figures 16 to 24C the specific structure of the backrest 9 will be introduced below.

[0103] As shown in FIG. 1, Figure 16 In an embodiment, the seat plate frame body 1 comprises a frame 12 and two L-shaped supports 11, and the two L-shaped supports 11 are installed at the rear end of the frame 12. The backrest 9 has two mounting plates 91, and each mounting plate 91 is rotationally connected with one L-shaped support 11.

[0104] As shown in FIG. 1, Figure 17 and Figure 18, the folding wheelchair further comprises a backrest locking mechanism 10, which comprises a hook assembly 101 and a catch assembly 102. The hook assembly 101 is rotatably installed on the backrest 9, and the catch assembly 102 is fixedly installed on the L-shaped support 11. The hook assembly 101 comprises a pull rod 111, and a first hook assembly 112 and a second hook assembly 113 are installed at both ends of the pull rod 111. The first hook assembly 112 and the second hook assembly 113 are rotatably installed on the backrest 9, respectively. The hook assembly 101 and the catch assembly 102 are clamped to limit the rotation of the backrest 9 relative to the L-shaped support 11.

[0105] In the above embodiment, the first hook assembly 112 and the second hook assembly 113 are symmetrically arranged at both ends of the pull rod 111. During installation, the hook assembly 101 is installed in the middle of the backrest 9, the first hook assembly 112 is located in the left area of the backrest 9, and the second hook assembly 113 is located in the right area of the backrest 9, so that the stress of the backrest 9 is evenly distributed during locking. When the hook assembly 101 and the catch assembly 102 are clamped, the rotation of the backrest 9 is limited, and the angle between the backrest 9 and the L-shaped support 11 is fixed, thereby achieving the locking of the backrest 9. When unlocking, the pull rod 111 is lifted to rotate the first hook assembly 112 and the second hook assembly 113 simultaneously and separate from the catch assembly 102 to achieve unlocking. The linkage structure formed by the first hook assembly 112, the second hook assembly 113 and the pull rod 111 enables the user to complete the unlocking operation of the backrest 9 with one hand, which is convenient to operate.

[0106] The first hook assembly 112 and the second hook assembly 113 have the same structure, and the structure of the first hook assembly 112 is introduced as an example.

[0107] As Figure 19As shown, in an embodiment, the first hook assembly 112 includes a hook 1121 and an elastic member 1122, which is arranged between the hook 1121 and the pull rod 111. Specifically, the elastic member 1122 can be a T-shaped rubber ring. The pull rod 111 has two limiting blocks 1112, which can limit the two hooks 1121 from approaching each other. The two hooks 1121 are arranged on the sides of the two limiting blocks 1112 away from each other. The T-shaped rubber ring includes a first portion 11221 and a second portion 11222 perpendicular to each other. The hook 1121 is provided with a third mounting hole 11211, the first portion 11221 is located between the inner wall of the third mounting hole 11211 and the outer wall of the pull rod 111, and the second portion 11222 is located between the hook 1121 and the limiting block 1112. Since the elastic member 1122 can be deformed, the connection between the hook 1121 and the pull rod 111 forms a floating connection, that is, the hook 1121 and the pull rod 111 can produce radial relative displacement or the hook 1121 rotates around the pull rod 111. The two hooks 1121 can independently rotate around the pull rod 111 within a certain pre-pressing range, or moderately deviate in a direction perpendicular to the axial direction of the pull rod 111. The pre-pressing range refers to the displacement or deformation interval allowed when a pre-pressing load is applied to a material or structure in an engineering or mechanical system. The elastic member 1122 automatically fine-tunes the position of the hook 1121, which can absorb the machining and assembly size error of the different centers of the third mounting holes 11211 of the two hooks 1121, avoid the situation that the two hooks 1121 are locked at one end due to the error, the other end of the hook 1121 is not connected with the catch assembly 102, and make the locking mechanism more reliable.

[0108] In an embodiment, the hook 1121 is also provided with a fourth mounting hole 11212, and the first hook assembly 112 and the second hook assembly 113 are respectively installed on the backrest 9 through a hook connecting piece 103. The hook connecting piece 103 includes a hook mounting base 1031 and a hook pin 1032, the hook pin 1032 penetrates the fourth mounting hole 11212 and is connected with the hook mounting base 1031, and the hook 1121 can rotate around the hook pin 1032.

[0109] As Figure 20 and Figure 21As shown, in a further embodiment, the lock hook 1121 includes a hook portion 11213 and a lock hook connecting portion 11214. The hook portion 11213 is used to engage with the latch assembly 102 to achieve locking. The lock hook connecting portion 11214 is used to connect with the lock hook mounting base 1031 and install the lock hook pin 1032, which serves as the pivot of the lock hook. A third mounting hole 11211 is provided in the hook portion 11213, and a fourth mounting hole 11212 is provided in the lock hook connecting portion 11214. The hook portion 11213 and the lock hook connecting portion 11214 are located at both ends of the lock hook 1121, making the distance between the third mounting hole 11211 and the fourth mounting hole 11212 relatively large. The pull rod 111 is installed in the third mounting hole 11211 located in the hook portion 11213, which is relatively far from the pivot, making it easier for the user to pull the pull rod 111 to unlock.

[0110] In one embodiment, the hook connecting portion 11214 includes a first connecting plate 2141 and a second connecting plate 2142 arranged parallel to each other. Along the extending direction of the hook 1121, the length of the first connecting plate 2141 is greater than the length of the second connecting plate 2142. Both the first connecting plate 2141 and the second connecting plate 2142 are provided with a fourth mounting hole 11212, and the two fourth mounting holes 11212 are coaxially arranged. The second connecting plate 2142 has a gap with the hook mounting base 1031. Since the length of the first connecting plate 2141 is greater than the length of the second connecting plate 2142, the portion of the first connecting plate 2141 that is longer than the second connecting plate 2142 can abut against the hook mounting base 1031, thereby limiting the rotation angle of the hook 1121.

[0111] like Figure 22 As shown, in one embodiment, the backrest 9 is connected to the L-shaped bracket 11 via a backrest pivot 94, which can specifically be a bolt. The axial direction of the backrest pivot 94 is consistent with the axial direction of the pull rod 111, and the backrest 9 rotates around the backrest pivot 94. The backrest 9 includes a support portion 92 and a mounting portion 93, which are located on opposite sides of the backrest pivot 94. A locking hook assembly 101 is mounted on the mounting portion 93. With the locking hook assembly 101 and the buckle assembly 102 unlocked, rotating the backrest 9 causes the support portion 92 to move closer to the frame 12, and the mounting portion 93 drives the locking hook assembly 101 away from the buckle assembly 102.

[0112] In one embodiment, the latch assembly 102 includes a latch mounting base 1021 and a stop pin 1022. The latch mounting base 1021 is fixedly mounted on one side of two L-shaped brackets 11 facing each other, and the latch mounting base 1021 is perpendicular to the lock hook mounting base 1031. The stop pin 1022 is mounted on the latch mounting base 1021, and the axial direction of the stop pin 1022 is aligned with the axial direction of the pull rod 111. When the lock hook engages the stop pin 1022, locking is achieved.

[0113] The hook 1121 rotates from a third position (the position of the hook in the figure) Figure 17 to a fourth position (the position of the hook in the figure) Figure 18 . The third position can be regarded as an initial position, and the fourth position can be regarded as an unlocking position. When the hook 1121 is in the third position, the first connecting plate 2141 abuts against the hook mounting base 1031. When the pull rod 111 is pulled to rotate the hook 1121 to the fourth position, the first connecting plate 2141 is away from the hook mounting base 1031.

[0114] As shown in the figure, Figure 23 in an embodiment, a hook reset member 104 is arranged between the hook 1121 and the hook mounting base 1031. The hook reset member 104 is used to drive the hook portion 11213 to be away from the backrest 9, i.e., to rotate from the fourth position to the third position. Specifically, the hook reset member 104 can be a torsion spring. The torsion spring is mounted on the hook pin 1032. The hook mounting base 1031 is provided with a clamping block 10311. One end of the torsion spring abuts against the clamping block 10311, and the other end abuts against the hook 1121. When the pull rod 111 is pulled to make the hook 1121 in the fourth position, the torsion spring is energized. When the pull rod 111 is released, the hook 1121 is automatically returned to the third position under the driving of the hook reset member 104.

[0115] As shown in the figure, Figures 24A to 24C in an embodiment, the hook portion 11213 of the hook 1121 is provided with an arc-shaped guide surface 2131 away from the backrest 9. The arc-shaped guide surface 2131 is curved towards the backrest 9. When the backrest 9 is in a completely folded state, the hook 1121 is spaced apart from the blocking pin 1022 by a predetermined distance. Figure 24A During the process of the backrest 9 from the folded state to the open state, the backrest 9 rotates around the backrest rotating shaft 94. The mounting portion 93 gradually approaches the L-shaped support 11, and the leaning portion 92 gradually moves away from the L-shaped support 11. The mounting portion 93 drives the hook 1121 to gradually approach the blocking buckle assembly 102. After the arc-shaped guide surface 2131 of the hook portion 11213 hits the blocking pin 1022, the blocking pin 1022 slides along the arc-shaped guide surface 2131. Figure 24B Under the pushing force of the blocking pin 1022, the hook 1121 rotates to the fourth position. When the blocking pin 1022 slides to the end of the arc-shaped guide surface 2131, the backrest 9 is completely opened. Under the action of the hook reset member 104, the hook 1121 is automatically reversely rotated. The blocking pin 1022 slides into the hook portion 11213 and is clamped with the hook portion 11213. Figure 24C , thereby locking the backrest 9. At this time, the backrest 9 is opened to a predetermined position.

[0116] When the locking hook assembly 101 is locked with the blocking buckle assembly 102, the backrest 9 is in an unfolded state, and the backrest 9 tends to be at a preset angle with the frame 12 of the seat plate frame body 1, which can be about 90°. The present application does not limit the preset angle of the unfolded backrest 9. When the locking hook assembly 101 is not locked with the blocking buckle assembly 102, the backrest 9 can be in a folded state or in a freely rotating state.

[0117] In an embodiment, the folding wheelchair can further comprise a power mechanism for driving the wheelchair to move, and the user can independently drive the wheelchair to move. The power mechanism is a prior art in electric wheelchair, and the specific structure thereof will not be described herein.

[0118] As shown in Figure 25 The folding steps of the folding wheelchair are as follows: first, hold the upper edge of the backrest 9 with hands and lift upward. Then, step on the unlocking pedal 21 and kick the unlocking pedal 21 forward to make the rear arm frame body 4 close to the front arm frame body 3. When the rear wheel contacts the front wheel, the rear arm frame body 4 cannot continue to rotate, at this time, release the unlocking pedal 21, and make the locking pin 22 inserted into the clamping hole 231 to lock the folding mechanism. Then, press the button 831 on the armrest 8 and rotate the armrest 8 forward to fold the armrest 8. Finally, after pulling the pull rod 111 to unlock the backrest 9, turn the backrest 9 forward to fold the backrest 9.

[0119] The folding wheelchair of the present application adopts a vertical folding manner and a three-axis folding structure, which makes the wheelchair easy to fold, and the folded wheelchair has a small volume, which is convenient for storage and carrying.

[0120] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A folding wheelchair, characterized in that, The folding mechanism, the seat frame body and the locking mechanism, wherein, The folding mechanism comprises a front arm frame body and a rear arm frame body connected by rotation, the front arm frame body comprises a front arm and a connecting arm, the front arm and the connecting arm have a first included angle, the rear arm frame body has a first end and a second end, the first end is connected to the junction of the front arm and the connecting arm; The seat frame body is fixedly installed on the connecting arm; The locking mechanism is used to limit the rotation of the rear arm frame body relative to the front arm frame body, the locking mechanism comprises an unlocking pedal and a limiting assembly, the unlocking pedal is located at the second end, the limiting assembly is installed between the front arm frame body and the rear arm frame body, and the unlocking pedal is used to unlock the limiting assembly.

2. The foldable wheelchair of claim 1, wherein, The limiting assembly comprises a locking pin and a limiting ring, the limiting ring has at least two clamping holes, and the locking pin is inserted into different clamping holes to adjust the included angle between the rear arm frame body and the front arm.

3. The foldable wheelchair of claim 2, wherein, The locking mechanism further comprises a pull rope, one end of the pull rope is connected to the unlocking pedal, and the other end of the pull rope is connected to the locking pin.

4. The foldable wheelchair of claim 2, wherein, The front arm frame body is provided with a mounting cavity, the limiting ring is fixedly installed in the mounting cavity, the mounting cavity is a cylindrical cavity, and the limiting ring is coaxially arranged with the mounting cavity.

5. The foldable wheelchair of claim 4, wherein, The circumferential side wall of the mounting cavity is provided with an avoiding hole, and the avoiding hole is used to avoid the locking pin.

6. The foldable wheelchair of claim 5, wherein, The clamping holes are arranged on the circumferential outer wall of the limiting ring, and the vertical projection of the limiting ring completely covers the at least two clamping holes.

7. The foldable wheelchair of claim 1, wherein, The front arm frame body is provided with a limiting groove, and the rear arm frame body is installed in the limiting groove, and the limiting groove is used to limit the rotation angle of the rear arm frame body.

8. The foldable wheelchair of claim 1, wherein, The rear arm frame body is provided with a guide structure, the limiting assembly comprises a locking pin, and the locking pin is arranged in the guide structure.

9. The foldable wheelchair of claim 8, wherein, The limiting assembly further comprises a limiting ring, one end of the locking pin away from the limiting ring is provided with a boss, and the boss is abutted with the outer side wall of the guide structure to limit the movement range of the locking pin.

10. The foldable wheelchair of claim 9, wherein, The pull rope is fixedly connected to the rear arm frame body through a connecting piece, the connecting piece is spaced apart from the guide structure by a preset distance, the locking mechanism further comprises a reset member, the reset member is sleeved outside the pull rope and located between the boss and the connecting piece, and the reset member is used to drive the locking pin to be close to the limiting ring.

11. The foldable wheelchair of claim 8, wherein, The front arm frame body is provided with a cylindrical mounting cavity, one side of the guide structure towards the mounting cavity has an arc surface, and the arc surface is coaxially arranged with the cylindrical mounting cavity.

12. The foldable wheelchair of claim 1, wherein, Further comprising an armrest, the armrest is rotationally connected to the connecting arm, the armrest comprises an armrest body and a connecting rod, the armrest body and the connecting rod have a second included angle, and the first included angle is equal to the second included angle.

13. The foldable wheelchair of claim 1, wherein, Further comprising a backrest, the backrest is rotationally connected to the seat frame body.

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