Folding scooter body structure

Abstract

The invention relates to a folding scooter body structure, and belongs to the field of scooters, the folding scooter body structure comprises a plurality of single-degree-of-freedom folding units, a steering seat folding unit comprises a front support and a rear support which are rotatably connected, and a seat folding unit comprises a seat rear support and a seat lower support which are rotatably connected; the front support is rotationally connected with the seat lower support, the rear support is rotationally connected with the seat rear support, and therefore a transmission folding unit is formed, when a user needs to fold the scooter body, any one movable assembly can be moved according to needs, the whole scooter body is folded, and the problem that in the prior art, when the scooter is folded, the scooter body is inconvenient to fold is solved. The operation is completed by bending down and lifting up the vehicle body, the folding process is complicated, and the operation is very difficult for the disabled.

Description

Technical Field

[0001] This invention relates to the field of mobility scooters, and in particular to a folding mobility scooter body structure. Background Technology

[0002] To facilitate storage and transportation, mobility scooters need to be folded to reduce their space when not in use. In existing technologies, the folding process of folding mobility scooters is often quite complicated, especially for those that require folding the base. Unlocking the base is necessary, which means that the base needs to be lifted or the user needs to bend over to complete the folding, which is difficult for users with mobility impairments.

[0003] For example, the "seat folding structure and folding frame" disclosed in Chinese patent literature, with publication number CN207106757U, includes a seat, a first seat support rod, a second seat support rod, a first connecting rod, and a drive shaft. The upper end of the first seat support rod is pivotally connected to the front end of the seat, and the lower end is pivotally connected to the vehicle chassis. The second seat support rod is pivotally connected to the middle of the first seat support rod in a cross manner via a pivot shaft, and its upper end is pivotally connected to the first connecting rod. The first connecting rod is pivotally connected to the rear end of the seat. The drive shaft is coaxially arranged with the pivot shaft, and a drive arm extends from the drive shaft. A pin on the drive arm is pivotally connected to the second seat support rod. The patent has a drawback: when folding, the "second seat support rod" needs to be rotated about 180° clockwise to complete the folding. Firstly, since the second seat support rod is located under the seat, users have to bend over to rotate it, which is difficult for people with mobility issues. Secondly, rotating it 180° means that the vehicle body needs to be lifted to complete the operation, making the folding process even more difficult. Summary of the Invention

[0004] The present invention aims to overcome the problem that in the prior art, folding a mobility scooter requires bending over and lifting the scooter body, which is complicated and difficult for people with mobility impairments. The invention provides a folding mobility scooter body structure that allows for more convenient and faster folding of the scooter.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This invention discloses a folding mobility scooter body structure, comprising several single-degree-of-freedom folding units. The steering seat folding unit includes a front support and a rear support that are rotatably connected, and the seat folding unit includes a rear seat support and a lower seat support that are rotatably connected. The front support and the lower seat support are rotatably connected, and the rear support and the rear seat support are rotatably connected, thereby forming a transmission folding unit.

[0006] In this application, the vehicle body is composed of several single-degree-of-freedom folding units. This means that within a single folding unit, any change in the relative position of any two components will cause the entire folding unit to deform. Similarly, the two components in the steering seat folding unit and the two components in the seat folding unit also serve as components of the transmission folding unit. This means that when the relative position of any component in any folding unit relative to the fixed component changes, the entire vehicle body can deform. In other words, when the user needs to fold the vehicle body, they can move any movable component as needed to fold the entire vehicle body without having to bend over to operate specific components, making it much more convenient.

[0007] Preferably, this application also includes a front axle and a rear axle, with a front wheel mounted on the front axle and a rear wheel mounted on the rear axle, the steering seat being fixedly connected to the front axle, and the rear seat bracket being fixedly connected to the rear axle.

[0008] Preferably, the seat rear support includes a backrest support portion and a wheel axle connection portion, with a backrest plate installed on the backrest support portion and the backrest plate rotatably connected to the backrest support portion.

[0009] Preferably, the upper end of the backrest support is connected to the seat armrest, and the upper end of the steering seat is provided with a steering handle. In the folded state, the front end of the seat armrest is located on both sides of the steering handle.

[0010] Preferably, the seat folding unit further includes a front seat support and a seat plate, on which a seat cushion is installed. In the folded state, the seat cushion abuts against the rear seat support.

[0011] Preferably, the rear seat support includes two rear support units, a seat support beam is connected between the two rear support units, a seat rear swing arm is provided on the seat support beam, and one end of the seat rear swing arm away from the seat support beam is rotatably connected to the seat plate.

[0012] Preferably, the seat panel is also provided with a pull ring.

[0013] Preferably, both the front seat support and the rear seat support are located inside the lower seat support, and a bending section is provided between the backrest support portion and the wheel axle connection portion of the rear seat support.

[0014] Preferably, in the folded state, the front wheel is located inside the rear wheel.

[0015] Preferably, during the folding process, the rotation angle between the front support and the lower seat support is greater than 180°.

[0016] Therefore, the present invention has the following beneficial effects: (1) The folding process is simple and does not require bending over; (2) The space is small after folding, which is convenient for storage and transportation; (3) In the unfolded state, the vehicle body is not easily folded due to non-human forces. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of one structure of the present invention.

[0018] Figure 2 This is a front view schematic diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of a folding unit for the steering seat of the present invention.

[0020] Figure 4 This is a schematic diagram of the base locking structure and base unlocking structure of the present invention.

[0021] Figure 5 This is a schematic diagram of the structure of the connection between the upper and lower buckles of the present invention.

[0022] Figure 6 This is a schematic diagram of the structure of the seat folding unit of the present invention.

[0023] Figure 7 This is a schematic diagram of the transmission folding unit of the present invention.

[0024] The diagram shows: 1. Steering seat; 2. Front axle; 3. Front wheel; 4. Swing arm; 5. Rear support; 6. Rear axle; 7. Rear wheel; 8. Rear seat support; 9. Lower seat support; 10. Front seat support; 11. Seat plate; 12. Bottom support; 13. Front side support; 14. Front side connecting structure; 15. Figure-eight connecting rod; 16. Crossbeam; 17. Lower buckle mounting part; 18. Rear side support; 19. Crossbar; 20. Upper buckle mounting seat; 21. Upper buckle; 22. Lower buckle mounting seat; 23. Lower buckle; 24. Locking part; 25. Locking buckle part; 26. Unlocking part; 27. Pedal; 28. Rotary unlocking part; 29. ​​Unlocking lever; 30. Limiting plate; 31. First return spring; 32. Second return spring; 33. Front side seat rod; 34. Connecting seat; 35. Folded bracket; 36. Seat support beam; 37. Rear seat swing arm; 38. Backrest support part; 39. Bent section; 40. Wheel axle connection part; 41. Seat armrest part; 42. Backrest panel 43. Detailed Implementation

[0025] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0026] Example: Figure 1-7As shown, a folding mobility scooter body structure includes a steering seat 1, a front axle 2, a front wheel 3, a front support 4, a swing arm 5, a rear support 6, a rear axle 7, a rear wheel 8, a rear seat support 9, a lower seat support 10, a front seat support 11, and a seat plate 12.

[0027] The vehicle body structure includes three single-degree-of-freedom folding units: the steering seat folding unit, the seat folding unit, and the transmission folding unit. These three folding units are interconnected.

[0028] The steering seat 1 folding unit includes a steering seat 1, a front bracket 4, a rear frame, and a swing arm 5. These four components are rotatably connected in sequence, and all the rotating shafts of the rotatable connections are parallel to each other, thus forming a planar four-bar linkage. This planar four-bar linkage has a single degree of freedom. When the relative angle between any two adjacent components changes, the relative angle between the other adjacent components also changes accordingly.

[0029] Specifically, taking the relative positional relationship of the components when the vehicle body is in the unfolded state as an example: The steering seat 1 includes a bottom support 13 located at its bottom. The upper part of the bottom support 13 is rotatably connected to the swing arm 5, and the lower part of the bottom support 13 is connected to the front bracket 4. The front wheel axle 2 is installed at the left and right ends of the bottom support 13. The front bracket 4 includes two parallel front side brackets 14. The front bracket 4 has a front connecting structure 15 at one end near the steering seat 1, which is directly connected to the bottom support 13. The width of the front connecting structure 15 is smaller than the distance between the two front side brackets 14. The front connecting structure 15 and the front side brackets 14 are connected by a figure-eight connecting rod 16. The front side of the figure-eight connecting rod 16 forms a notch to avoid the front wheel 3 from being hit during the folding process. A crossbeam 17 is also connected between the two front side brackets 14. The crossbeam 17 is located at the rear of the front bracket 4. The middle part of the crossbeam 17 is provided with a lower buckle 24 mounting part 18. The connection point between the crossbeam 17 and the front bracket 14 is located on the front side of the lower buckle 24 mounting part 18. This is because the lower buckle 24 mounting seat 23 needs to be used to install the locking structure of the vehicle body. Its position is designed as far back as possible to increase the lever arm length of the locking structure. However, the position of the connection point cannot be too far back, otherwise it will cause interference at the connection between the front bracket 4 and the lower seat bracket 10.

[0030] The rear support 6 includes two parallel rear supports 19 and a crossbar 20 located at the front of the rear support 6. Both ends of the crossbar 20 are connected to the two rear supports 19 respectively. An upper buckle 22 mounting seat 21 is provided at the middle of the crossbar 20. The front end of the upper buckle 22 mounting seat 21 is rotatably connected to the swing rod 5. The crossbar 20 is rotatably connected to the front support 14. The front support 14 is parallel to the rear supports 19. The crossbar 20 is located at the front end of the rear support 19, but a distance from the rear end of the front support 14. The portion of the front support 14 located behind the crossbar 20 serves as a limiting part between the front support 4 and the rear support 6. This limiting part is located above the rear support 19, thereby limiting the rear support 6 in the counterclockwise rotation direction relative to the front support 4.

[0031] The swing arm 5 is provided with a first bend and a second bend. At the first bend, the swing arm 5 forms a downward recess. This structure is used to limit the upper buckle 22 mounting seat 21 when the vehicle body is folded. At the second bend, the swing arm 5 forms an upward protrusion. This structure allows the swing arm 5 and the upper buckle 22 mounting seat 21 to fit together when the vehicle body is folded, forming a storage recess, thus occupying less space.

[0032] The front bracket 4 and the rear bracket 6 together form the base of this application, and the base also includes a base locking structure and a base unlocking structure.

[0033] The base locking structure includes an upper buckle 22 mounted on an upper buckle 22 mounting base 21 and a lower buckle 24 mounted on a lower buckle 24 mounting base 23. The lower buckle 24 mounting base 23 is mounted on the lower buckle 24 mounting part 18. Since the lower buckle 24 is located below the upper buckle 22, it can prevent the rear support 6 from rotating downwards. Therefore, in the unfolded state, the clockwise and counterclockwise rotation of the rear support 6 is restricted, and it cannot move relative to the front support 4. In the planar four-bar linkage, once the relative positions of any two bars are fixed, the entire planar four-bar linkage is in a fixed state, thus allowing the vehicle body to be completely locked. Here, the limit in the counterclockwise rotation direction of the rear support 6 needs to be maintained permanently, while the limit in the clockwise rotation direction can be canceled by unlocking.

[0034] The crossbeam 17 serves two purposes: firstly, it acts as a reinforcement for the rear end of the front support 4, strengthening the structure and connecting the two front supports 14; secondly, it provides support for the installation of the lower buckle 24. Similarly, the crossbar 20 also serves as a reinforcement for the rear support 6, strengthening the structure while connecting the two rear supports 19 and providing support for the installation of the upper buckle 22. Furthermore, the upper buckle 22 mounting base 21 is located at the midpoint of the crossbar 20, and the lower buckle 24 mounting base 23 is located at the midpoint of the crossbeam 17. This arrangement allows for a more balanced distribution of forces between the crossbar 20 and the crossbeam 17.

[0035] The upper side of the upper buckle 22 is fixed to the lower side of the upper buckle 22 mounting base 21 by screws. The upper buckle 22 includes a locking part 25 located at its rear side. The lower side of the upper buckle 22 is located on the locking part 25 and abuts against the lower buckle 24. The upper side of the locking part 25 is an arc surface, and the center of curvature of the arc surface is located at the front side of the arc surface. The lower buckle 24 includes a latching part 26 that abuts against the lower side of the upper buckle 22 and an unlocking part that abuts against the unlocking structure. A notch is formed between the latching part 26 and the main body of the lower buckle 24 to accommodate the unlocking part of the upper buckle 22. The upper side of the latching part 26 is flat and abuts against the locking part 25 when the vehicle body is unfolded. The front side of the latch 26 is a self-driving surface. During the locking process, it abuts against the arc surface on the upper side of the locking part 25 and is subjected to pressure from the locking part 25, thereby causing the latch 26 to rotate until the locking part 25 can be engaged in the notch on the latch 26. At this point, the locking process is completed and the vehicle body enters the unfolded state.

[0036] The unlocking structure includes a pedal 28, a rotating unlocking component 29, and an unlocking lever 30 that abuts against the lower latch 24. The unlocking lever 30 is fixed to the rotating unlocking component 29. One end of the rotating unlocking component 29 is connected to the pedal 28 via a connecting rod, and the two rotate synchronously; the other end of the rotating unlocking component 29 is rotatably connected to the unlocking component support. The unlocking component support is fixedly installed on the crossbar 20 of the rear bracket 6. The unlocking lever 30 has a C-shaped structure, and its shape and size can be designed according to the relative position of the rotating unlocking component 29 and the lower latch 24. The unlocking lever 30 includes a lever surface that abuts against the unlocking part of the lower latch 24. The rotating unlocking component 29 is also provided with a limiting stop 31 that abuts against the crossbar 20 when the pedal 28 is not pressed. The position of the lower latch 24 is positioned by the position of the limiting stop 31 when it abuts against the crossbar 20.

[0037] A first return spring 32 is connected between the rotating unlocking component 29 and the base. Further, one end of the first return spring 32 is connected to the limiting stop 31 on the rotating unlocking component 29, and the other end is connected to the rear bracket 19 near the limiting stop 31. The first return spring 32 is in a stretched state during unlocking, allowing the rotating unlocking component 29 to tend towards the abutment between the crossbar 20 and the limiting stop 31 when no external force is applied. A second return spring 33 is connected between the lower buckle 24 and the lower buckle 24 mounting base 23. The second return spring 33 is a torsion spring, and the elastic force generated by the torsion spring on the lower buckle 24 causes the lower buckle 24 to tend towards the abutment between the locking part 26 and the upper opening.

[0038] When this application is in the unfolded state, the front support 4 and the rear support 6 are parallel, and the front support 4 and the steering seat 1 form an angle greater than 60° but not exceeding 90°. The pedal 28 is parallel to the rear support 19. The rear support 6 is limited in the clockwise direction relative to the front support 4 by the lower buckle 24 and the upper buckle 22, and the rear support 6 is limited in the counterclockwise direction relative to the front support 4 by the front support 14 and the rear support 19. At this time, the four wheels of this application are on the ground, and the base is in a horizontal state. When the user needs to fold this application, the pedal 28 is pressed down. Since the vehicle body is supported on the ground by the wheels, the rear support 6 can remain in a horizontal state. When the pedal 28 is pressed down, the pedal 28 rotates relative to the rear support 6, thereby driving the rotating unlocking member 29 to rotate. After the rotating unlocking member 29 rotates, the lower buckle 24 and the upper buckle 22 disengage, so that the rear support 6 is unlocked by clockwise rotation relative to the front support 4. Since the steering seat 1, swing arm 5, front bracket 4, and rear bracket 6 together form a single-degree-of-freedom planar four-bar linkage, the entire mechanism can be deformed simply by changing the relative positions of any two links in the planar four-bar linkage. It is important to note that in the unfolded state, the angle between the swing arm 5 and the rear frame is greater than 180° in its folding direction, which is the direction in which the rear bracket 6 rotates clockwise. This structure ensures that during driving, if a large external force in the front-rear direction is applied due to a collision, the planar four-bar linkage will exhibit a movement tendency opposite to the folding direction. This prevents the base locking structure from automatically unlocking due to collision forces, thereby improving the reliability of the lock and avoiding increased damage caused by vehicle collisions.

[0039] The seat folding unit includes a front seat support 11, a seat plate 12, a rear seat support 9, and a lower seat support 10. These four components are rotatably connected in sequence, and all the rotating shafts of the rotatable connections are parallel to each other, thus forming a planar four-bar linkage. This planar four-bar linkage has a single degree of freedom, and when the relative angle between any two adjacent components changes, the relative angle between the remaining adjacent components also changes accordingly.

[0040] The front seat support 11 includes two parallel front seat side rods 34. Each front seat side rod 34 has a straight structure, with its upper end rotatably connected to the seat plate 12 and its lower end rotatably connected to the lower seat support 10. The lower seat support 10 includes two parallel lower seat side rods, also straight structures. Each lower seat side rod has its upper end rotatably connected to the rear seat support 9, and its upper part rotatably connected to the upper seat support at a certain distance from its upper end.

[0041] The seat panel 12 is horizontally positioned, with two connecting seats 35 on its lower side. The seat panel 12 is rotatably connected to the front seat support 11 at the connecting seats 35. By providing a connecting seat 35, the connection point is located below the seat panel 12, rather than on the plane of the seat panel 12. This allows the front seat support 11 to be closer to the seat panel 12 after folding, reducing the space occupied when folded. The rear side of the seat panel 12 is rotatably connected to the rear seat support 9.

[0042] The seat panel 12 is also provided with four screw holes, through which the seat cushion can be installed on the seat panel 12, thereby making the user more comfortable sitting on the seat panel 12. The front side of the seat panel 12 is also provided with a pull ring, which is located at the top of the entire vehicle body after folding, allowing the user to pull the entire vehicle body to move, thereby making this application more convenient for movement and transportation.

[0043] The rear seat support 9 includes two parallel zigzag supports 36. Each zigzag support 36 has two bends, which form a shape to support and store the seat panel 12 and seat cushion when folded. In the folded state, the seat cushion fits snugly against the rear seat support 9, forming a buffer to prevent damage to components due to bumps or other factors during vehicle movement. Two horizontal support rods connect the two zigzag supports 36, positioned at the two bends of the zigzag supports 36. The lower support rod is a seat support beam 37, which has two rear seat swing arms 38. The upper ends of the rear seat swing arms 38 are rotatably connected to the seat panel 12. The two bends divide the rear seat support 9 into three sections: a backrest support section 39, a bend section 40, and a wheel axle connection section 41. Seat armrests 42 are also installed on both sides of the upper end of the backrest support portion 39, which can improve driving safety. A backrest panel 43 is also installed on the backrest support portion 39. The backrest panel 43 is rotatably connected to the backrest support portion 39, and a damping element is provided on the pivot between the backrest panel 43 and the backrest support portion 39. The backrest panel 43 can be flipped over by rotating it. When the vehicle is unfolded, the backrest panel 43 can be flipped up; when the vehicle is folded, the backrest panel 43 can be folded down.

[0044] When this application is in the unfolded state, the upper ends of the front seat bracket 11 and the rear seat swing arm 38, which are connected to the seat plate 12, both face the front of the vehicle body. This structure ensures that when the front seat bracket 11 and the rear seat swing arm 38 are subjected to downward pressure from the seat plate 12, the resulting torque is in a counterclockwise direction, which is opposite to the direction of movement during the folding process. In other words, when the user's weight impacts the seat plate 12 due to road bumps during driving, a movement trend opposite to the folding direction of the vehicle body is generated. This prevents the base locking structure from automatically unlocking due to external collision forces, thereby improving the reliability of the lock and avoiding increased damage caused by vehicle collisions.

[0045] The transmission folding unit includes a front support 4, a rear support 6, a rear seat support 9, and a lower seat support 10. These four components are rotatably connected in sequence, and all the rotating shafts of the rotatable connections are parallel to each other, thus forming a planar four-bar linkage. This planar four-bar linkage has a single degree of freedom, and when the relative angle between any two adjacent components changes, the relative angle between the remaining adjacent components also changes accordingly.

[0046] When the vehicle is in its unfolded state, the upper end of the lower seat support 10 faces the rear of the vehicle body. This structure provides two benefits: During driving, in the event of a collision, the vehicle body tends to compress in the rear-to-rear direction. This means the lower seat support 10 will rotate counter-clockwise relative to the front support 4, opposite to its folding direction. This prevents the base locking structure from automatically unlocking due to external impact forces, thus improving locking reliability and preventing increased damage during collisions. Furthermore, during vehicle folding, the lower seat support 10 and the front support 4 are the only pair of adjacent components with a folding angle greater than 180°. This means that during folding, if the user does not change the two components they are operating, only one change in operating direction is required. This simplifies the vehicle folding process as much as possible.

[0047] During the folding process of this application's vehicle body, the user first unlocks the base unlocking structure, and then folds the vehicle body. Throughout the folding process, the front wheel 3 and the rear wheel 8 remain in contact with the ground, thus making the operation easier with ground assistance. The user can hold the upper part of the steering seat 1 with one hand and the upper part of the rear seat support 9 with the other hand to perform the folding operation. The folding operation is divided into two stages: In the first stage, the user swings the upper end of the rear seat support 9 backward. At this time, the rear end of the front support 4 and the front end of the rear support 6 both flip upward. When the lower seat support 10 and the front support 4 are on the same plane, the second stage begins, where the upper end of the rear seat support 9 is swinged forward. At this time, the steering seat 1 and the rear seat support 9 move closer together until they reach the fully folded state. In other words, to fold the vehicle body, the first stage requires flipping the upper end of the rear seat support 9 backward, and the second stage is when the folding is achieved. The purpose of this folding method is that in the event of a collision, the vehicle body will inevitably experience a tendency to compress forward and backward. If the first stage of folding directly folds the vehicle body, it will move in the same direction as the collision, causing the vehicle body to deform rapidly and potentially injuring the user. In this application, the deformation direction caused by the collision is opposite to the deformation direction of the first stage. Therefore, the vehicle body, due to its inherent structure, provides support during the collision, minimizing deformation and reducing the risk of injury to the user. Furthermore, too many changes in the folding direction would make the folding process inconvenient. Therefore, a two-stage folding method is a more preferred solution.

[0048] It should be noted that the folding method described above is the simplest and most labor-saving folding method in this application, but it is not the only folding method.

Claims

1. A folding mobility scooter body structure, characterized in that, It includes several single-degree-of-freedom folding units, wherein the steering seat folding unit includes a front bracket and a rear bracket that are rotatably connected, and the seat folding unit includes a rear seat bracket and a lower seat bracket that are rotatably connected; the front bracket is rotatably connected to the lower seat bracket, and the rear bracket is rotatably connected to the rear seat bracket, thereby forming a transmission folding unit.

2. The folding mobility scooter body structure according to claim 1, characterized in that, It also includes a front axle and a rear axle, with a front wheel mounted on the front axle and a rear wheel mounted on the rear axle. The steering seat is fixedly connected to the front axle, and the rear seat bracket is fixedly connected to the rear axle.

3. The folding mobility scooter body structure according to claim 2, characterized in that, The seat rear support includes a backrest support part and a wheel axle connection part. A backrest plate is installed on the backrest support part, and the backrest plate is rotatably connected to the backrest support part.

4. The folding mobility scooter body structure according to claim 3, characterized in that, The upper end of the backrest support is connected to the seat armrest, and the upper end of the steering seat is provided with a steering handle. In the folded state, the front end of the seat armrest is located on both sides of the steering handle.

5. The folding mobility scooter body structure according to claim 4, characterized in that, The seat folding unit also includes a front seat support and a seat plate, on which a seat cushion is installed. In the folded state, the seat cushion abuts against the rear seat support.

6. The folding mobility scooter body structure according to claim 5, characterized in that, The rear seat support includes two rear support units, and a seat support beam is connected between the two rear support units. A seat rear swing arm is provided on the seat support beam, and one end of the seat rear swing arm away from the seat support beam is rotatably connected to the seat plate.

7. The folding mobility scooter body structure according to claim 5, characterized in that, The seat panel is also equipped with a pull ring.

8. The folding mobility scooter body structure according to claim 5, characterized in that, Both the front seat support and the rear seat support are located inside the lower seat support, and a bent section is provided between the backrest support part and the wheel axle connection part of the rear seat support.

9. The folding mobility scooter body structure according to claim 2, characterized in that, When folded, the front wheels are located inside the rear wheels.

10. A folding mobility scooter body structure according to any one of claims 1-9, characterized in that, During the folding process, the rotation angle between the front support and the lower seat support is greater than 180°.

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