Folding seat structure and folding scooter

Abstract

The invention provides a folding seat structure and a folding scooter, the folding seat structure comprises a backrest mechanism, an armrest mechanism and a folding mechanism, the armrest mechanism comprises an armrest assembly, an armrest lifting assembly, an armrest rotating assembly and an armrest moving assembly, and the seat assembly is arranged at the top end of the folding mechanism; the bottom of the folding mechanism is hinged to the frame, and the folding mechanism can be switched between an unfolding position and a folding position relative to the frame. According to the folding seat structure and the folding scooter, through the design of the backrest mechanism, the armrest mechanism and the folding mechanism, the whole structure of the seat can be lowered and folded through the folding mechanism, the size of the folding scooter can be greatly reduced when the folding scooter is not used, and a user can conveniently and easily carry, carry and store the folding scooter; and the height of the armrest assembly and the left-right direction of the scooter can be shrunk, so that the space occupied by the armrest mechanism is reduced, and the armrest assembly is driven to rotate by combining the armrest rotating assembly so as to be conveniently stored into a smaller size.

Description

Technical Field

[0001] The present disclosure relates to the technical field of mobility scooters, and in particular to a folding seat structure and a folding mobility scooter. Background Art

[0002] At present, the seat structure of the mobility scooters on the market usually only has the function of lifting and adjusting, which cannot meet the needs of all people for comfortable use. In addition, the seat structure does not have the function of folding, which occupies a large space and is difficult for users to conveniently carry to public transportation facilities or to transfer manually over short distances. This is particularly prominent when it is necessary to flexibly switch travel modes or face natural obstacles such as stairs and steps, which greatly limits the convenience of its use. However, the existing folding mechanism that can fold the seat and the frame together is usually set on both sides of the frame, resulting in space occupation on both sides of the vehicle, limiting the user's activity space, and reducing the convenience of the folding operation; in addition, since the armrests on the seat structure are fixed structures and cannot be folded, they will prevent users from getting on and off the vehicle, and easily cause users to bump into them. Summary of the invention

[0003] The present disclosure provides a folding seat structure and a folding scooter to at least solve the above technical problems existing in the prior art.

[0004] According to a first aspect of the present disclosure, there is provided a folding seat structure, comprising a seat assembly, and further comprising:

[0005] A backrest mechanism, rotatably connected to the seat assembly and capable of being folded relative to the seat assembly;

[0006] An armrest mechanism, comprising an armrest assembly, an armrest lifting assembly, an armrest rotating assembly and an armrest moving assembly, wherein the armrest moving assembly is fixedly connected to the lower surface of the seat assembly and is arranged along the width direction of the seat assembly, the armrest rotating assembly is slidably connected to the armrest moving assembly and can slide along the length direction of the armrest moving assembly, one end of the armrest lifting assembly is rotatably connected to the armrest rotating assembly, and the armrest assembly is arranged on the other end of the armrest lifting assembly; and

[0007] A folding mechanism, wherein the seat assembly is arranged at the top end of the folding mechanism, and the bottom end of the folding mechanism is hinged to the center position in the width direction of the frame and can be switched between an unfolded position and a folded position relative to the frame.

[0008] In one embodiment, it also includes a seat adjustment mechanism arranged between the seat assembly and the folding mechanism, the seat adjustment mechanism includes a base and a seat moving assembly connected to the seat assembly, the base is fixedly connected to the top end of the folding mechanism, and the seat moving assembly is slidably connected to the base.

[0009] In one embodiment, a seat adjustment mechanism is further included between the seat assembly and the folding mechanism, the seat adjustment mechanism includes a seat rotation assembly for supporting the seat assembly, the seat rotation assembly is rotatably connected to the folding mechanism to drive the seat assembly to rotate relative to the folding mechanism.

[0010] In one embodiment, the seat rotation assembly includes a turntable, an elastic member, and a rotation adjustment component connected to the elastic member, the elastic member is fixedly connected to the lower surface of the turntable, and the rotation adjustment component is used to position the elastic member on a path rotating around the rotation axis of the turntable;

[0011] Wherein, the rotation adjustment component has a locked state and an unlocked state. When the rotation adjustment component is in the locked state, the elastic member is engaged with the rotation adjustment component to limit the position; when an external force is applied to the rotation adjustment component, the rotation adjustment component is converted to an unlocked state, so that the turntable and the elastic member can rotate freely and synchronously.

[0012] In one possible implementation manner, the armrest rotating assembly includes a rotating shaft component and a rotating control component, one end of the armrest lifting assembly away from the armrest assembly is sleeved on the rotating shaft component, and the armrest lifting assembly can rotate around the axis of the rotating shaft component, and the rotating shaft component and the armrest lifting assembly are connected via the rotating control component;

[0013] Wherein, the rotation control component has an initial position and a terminal position in the length direction of the rotating shaft component. When the rotation control component is located at the terminal position, the armrest lifting assembly can rotate freely around the rotating shaft component; when the armrest lifting assembly rotates to a specific position, the rotation control component rebounds from the terminal position to the initial position to limit the rotation of the armrest lifting assembly.

[0014] In one embodiment, the armrest lifting assembly includes a lifting and adjusting component and a support rod, the armrest assembly is connected to the lifting and adjusting component, and the lifting and adjusting component is sleeved on the support rod to drive the armrest assembly to move along the length direction of the support rod; the armrest moving assembly includes a hollow sleeve fixed to the lower surface of the seat assembly, and the armrest rotating assembly is inserted into the hollow sleeve to drive the two armrest assemblies to move towards or away from each other along the width direction of the seat assembly.

[0015] In one embodiment, the folding mechanism includes a forearm, a rear arm and a seat frame, the seat assembly and the seat frame are fixedly connected, the top end of the forearm is hinged to the front end of the seat frame, the bottom end of the forearm is hinged to the frame, the top end of the rear arm is hinged to the rear end of the seat frame, and the bottom end of the rear arm is hinged to the frame.

[0016] In one embodiment, the folding mechanism also includes a sliding component, the seat bracket is provided with a sliding groove, the sliding component is slidably connected to the sliding groove, the forearm is provided with a groove, and when the sliding component slides along the sliding groove into the groove, the seat bracket, the forearm and the rear arm are fixed.

[0017] According to a second aspect of the present disclosure, a foldable scooter is provided, comprising a frame, a driving wheel group, a steering wheel group and an auxiliary moving wheel group, and also comprising a handlebar mechanism and a folding seat structure as described in any one of the above-mentioned embodiments, wherein the handlebar mechanism comprises a connecting assembly fixed to the front end of the frame and a handlebar assembly rotatably connected to the connecting assembly, and when the folding seat structure as a whole is in a folded state, the handlebar assembly is folded relative to the connecting assembly to above the folding seat structure.

[0018] In one embodiment, the handlebar mechanism also includes a folding assembly, which includes a first folding member connected to the connecting assembly and a second folding member connected to the handlebar assembly, the first folding member and the second folding member are rotatably connected, a locking member is arranged between the first folding member and the second folding member, the locking member is coaxially arranged with the first folding member, and the locking member can rotate around a common axis relative to the first folding member.

[0019] The folding seat structure and the folding scooter disclosed herein enable the backrest mechanism to be stored into the seat assembly after use and to be relatively folded into a flat shape through the design of the backrest mechanism, the armrest mechanism and the folding mechanism of the folding seat structure. The folding mechanism can lower and store the entire structure of the seat, so that the volume of the scooter can be greatly reduced when not in use, which is convenient for users to carry, transport and store. The folding mechanism is arranged at the center position in the width direction of the frame, so that the seat as a whole is smoother when folded and unfolded, while reducing the occupation of the space on both sides of the vehicle and removing the restriction on the user's activity space. In addition, the armrest mechanism integrates the lifting function, the rotating function and the moving function. When the user is not using the vehicle, not only can the height of the armrest assembly be lowered and the distance between the two armrest assemblies be shrunk into the scooter to reduce the space occupied by the armrest mechanism, but it can also be combined with the armrest rotating assembly to drive the armrest assembly to rotate so as to facilitate storage to a smaller volume.

[0020] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

[0022] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0023] Figure 1 The overall structure of a folding seat structure of an exemplary embodiment of the present disclosure is shown. Figure 1 ;

[0024] Figure 2 The overall structure of a folding seat structure of an exemplary embodiment of the present disclosure is shown. Figure 2 ;

[0025] Figure 3 The overall structure of the folded seat structure of an exemplary embodiment of the present disclosure is shown in FIG. Figure 1 ;

[0026] Figure 4 The overall structure of the folded seat structure of an exemplary embodiment of the present disclosure is shown in FIG. Figure 2 ;

[0027] Figure 5 A schematic structural diagram showing a backrest mechanism of a folding seat structure according to an exemplary embodiment of the present disclosure;

[0028] Figure 6 A schematic diagram showing a seat adjustment mechanism of a folding seat structure according to an exemplary embodiment of the present disclosure Figure 1 ;

[0029] Figure 7 A schematic diagram showing a seat adjustment mechanism of a folding seat structure according to an exemplary embodiment of the present disclosure Figure 2 ;

[0030] Figure 8 A schematic diagram showing a seat adjustment mechanism of a folding seat structure according to an exemplary embodiment of the present disclosure Figure 3 ;

[0031] Fig. 9 A schematic structural diagram showing an armrest mechanism of a folding seat structure according to an exemplary embodiment of the present disclosure;

[0032] Fig.10 A partial enlargement of the armrest mechanism of a folding seat structure of an exemplary embodiment of the present disclosure is shown. Figure 1 ;

[0033] Fig.11 A partial enlargement of the armrest mechanism of a folding seat structure of an exemplary embodiment of the present disclosure is shown. Figure 2 ;

[0034] Fig.12 A schematic structural diagram showing a folding mechanism of a folding seat structure according to an exemplary embodiment of the present disclosure is shown;

[0035] Fig.13 The overall structure of a foldable scooter according to an exemplary embodiment of the present disclosure is shown in FIG. Figure 1 ;

[0036] Fig.14 The overall structure of a foldable scooter according to an exemplary embodiment of the present disclosure is shown in FIG. Figure 2 ;

[0037] Fig.15 A schematic structural diagram of a handlebar mechanism of a foldable scooter according to an exemplary embodiment of the present disclosure is shown.

[0038] Explanation of the reference numerals in the figure: 1. seat assembly; 2. backrest mechanism; 3. armrest mechanism; 4. folding mechanism; 5. seat adjustment mechanism; 6. handlebar mechanism; 7. frame; 8. driving wheel set; 9. steering wheel set; 10. auxiliary moving wheel set; 21. backrest bracket; 22. backrest assembly; 31. armrest assembly; 32. armrest lifting assembly; 33. armrest rotating assembly; 34. armrest moving assembly; 41. front arm; 42. rear arm; 43. seat bracket; 44. sliding assembly; 51. base; 52. seat moving assembly; 53. seat rotating assembly; 61. connecting assembly; 62. handlebar assembly; 63. folding assembly; 321. lifting and adjusting component; 322. support rod; 331. shaft component; 332. rotation control component; 341. hollow sleeve; 342. locking component; 411, groove; 431, slide; 521, mounting seat; 522, movable adjustment component; 523, first seat support; 524, first locking assembly; 531, turntable; 532, elastic member; 533, rotation adjustment component; 534, second seat support; 535, limit assembly; 536, second locking assembly; 631, first folding member; 632, second folding member; 633, locking member; 3221, bearing part; 3222, accommodating groove; 3223, stopper; 3311, guide part; 5211, card slot; 5212, second positioning hole; 5221, locking pin; 5222, adjustment fixing part; 5223, positioning block; 5331, positioning part; 5332, hand-held part; 5341, first limit hole; 5351, second limit hole. DETAILED DESCRIPTION

[0039] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0040] Reference Figure 1 , Figure 3 , Figure 5 and Fig. 9As shown, a folding seat structure of an exemplary embodiment of the present disclosure includes a seat assembly 1, a backrest mechanism 2, an armrest mechanism 3 and a folding mechanism 4. The seat assembly 1 provides a seat for a user. The backrest mechanism 2 is rotatably connected to the seat assembly 1 and can be folded relative to the seat assembly 1. The armrest mechanism 3 includes an armrest assembly 31, an armrest lifting assembly 32, an armrest rotating assembly 33 and an armrest moving assembly 34. The armrest moving assembly 34 is fixedly connected to the lower surface of the seat assembly 1 and is arranged along the width direction of the seat assembly 1. The armrest rotating assembly 33 is slidably connected to the armrest moving assembly 34 and can slide along the length direction of the armrest moving assembly 34. One end of the armrest lifting assembly 32 is rotatably connected to the armrest rotating assembly 33, and the armrest assembly 31 is arranged on the other end of the armrest lifting assembly 32. The seat assembly 1 is arranged at the top of the folding mechanism 4. The bottom of the folding mechanism 4 is hinged to the center position in the width direction of the frame and can be switched between an unfolded position and a folded position relative to the frame.

[0041] In this embodiment, it should be first explained that the front, back, left, right, up and down directions in this disclosure are based on the directions when the folding seat structure is normally used. For example, the seat assembly 1 is arranged in front of the backrest mechanism 2 to provide a seat for the user. The backrest mechanism 2 provides back support for the user. The design of the backrest mechanism 2 usually takes ergonomics into consideration to ensure the comfort and safety of the user during use. The width direction of the seat assembly 1 or the frame is the left and right direction. The backrest mechanism 2 includes a backrest bracket 21 and a backrest assembly 22. The backrest bracket 21 has a support portion. The backrest assembly 22 can be supported by the support portion to prevent the backrest assembly 22 from folding backwards, so as to improve the stability of the overall mechanism. One end of the backrest bracket 21 away from the support portion is fixedly connected to the seat assembly 1. The backrest assembly 22 is rotatably connected to the backrest bracket 21 and can rotate relative to the backrest bracket 21 around a rotation center. The armrest mechanism 3 integrates the lifting function, the rotating function and the moving function. When the user idles the folding seat structure, the armrest assembly 31 can be reduced in the height direction and the distance between the two armrest assemblies 31 can be shortened in the width direction to reduce the space occupied by the armrest mechanism 3. The armrest assembly 31 can also be flipped to avoid the boarding and alighting position, which is not only convenient for the user to board and alight, but also allows the armrest mechanism 3 to be stored in a smaller volume, which is convenient for carrying and transporting, and saves storage space. When using the folding seat structure, the user can adjust the position of the armrest assembly 31 in the width direction and the height direction of the seat assembly 1 according to his own volume, and has strong adaptability. Among them, the armrest moving assembly 34 is fixedly connected to the lower surface of the seat assembly 1 and is arranged along the width direction of the seat assembly 1 to ensure that the armrest rotating assembly 33 can drive the armrest assembly 31 to move in the width direction, thereby adjusting the distance between the two armrest assemblies 31. A damping control structure or a mechanical control structure may be provided at the rotational connection between the armrest lifting assembly 32 and the armrest rotating assembly 33, so as to lock the armrest lifting assembly 32 at a specific position after rotating around the armrest rotating assembly 33. For example, when a damping control structure is provided, the damper may be directly mounted on the rotating shaft to produce a damping effect through friction; when a mechanical control structure is provided, a specific mechanical structure is designed to limit or adjust the rotational position, and commonly used mechanical structure control methods include but are not limited to key connection, pin connection or threaded connection, etc. For the folding mechanism 4, when the seat assembly 1 needs to be used, the folding mechanism 4 drives the seat assembly 1 to be lifted as a whole, so that the seat assembly 1 reaches the normal use height, and the folding mechanism 4 is in the unfolded position at this time; when the seat assembly 1 needs to be folded, the folding mechanism 4 is flipped toward the front end of the frame to drive the seat assembly 1 to be lowered as a whole, and then it can be buckled with the frame, and the folding mechanism 4 is in the folded position at this time.Among them, the connection between the seat assembly 1 and the top of the folding mechanism 4, and the hinge between the bottom of the folding mechanism 4 and the frame can be provided with a damping control structure or a mechanical control structure, which is used to lock the folding mechanism 4 after rotating around the frame at a specific position. It should be noted that when the damping control structure is selected, it is necessary to design the damping control structure on the basis of ensuring the stability and safety of the user when using the seat assembly 1 normally, so that the folding mechanism 4 can be folded and unfolded. Since the folding mechanism 4 is arranged at the center position in the width direction of the frame, the seat as a whole is smoother when folding and unfolding, while reducing the occupation of the space on both sides of the vehicle, removing the restriction on the user's activity space, making it convenient for the user to get on and off the vehicle, and preventing leg bumps. It can be understood that it is preferred that the folding mechanism 4 is flipped toward the front end of the frame to drive the seat assembly 1 to be lowered as a whole, and the armrest lifting assembly 32 drives the armrest assembly 31 to flip backward, so that the space utilization rate after folding is optimal. In summary, the folding seat structure of the present invention is designed with a backrest mechanism 2, an armrest mechanism 3 and a folding mechanism 4, so that the backrest mechanism 2 can be stored into the seat assembly 1 after use and folded into a relatively flat shape. The folding mechanism 4 can lower and fold the overall structure of the seat, so that the volume of the mobility scooter can be greatly reduced when not in use, which is convenient for users to carry, transport and store easily. In addition, the folding mechanism 4 is arranged at the center position in the width direction of the frame, so that the seat as a whole is smoother when folded and unfolded, while reducing the space occupied on both sides of the vehicle and removing the restriction on the user's activity space. In addition, the armrest mechanism 3 integrates the lifting function, the rotation function and the movement function. When the user is not using the vehicle, not only can the height of the armrest assembly 31 be lowered and the distance between the two armrest assemblies 31 be shrunk into the mobility scooter to reduce the space occupied by the armrest mechanism 3, but it can also be combined with the armrest rotating assembly 33 to drive the armrest assembly 31 to rotate so as to facilitate storage to a smaller volume.

[0042] Reference Figure 2 , Figure 4 , Figure 6 and Figure 7 As shown, in one embodiment, the folding seat structure also includes a seat adjustment mechanism 5 arranged between the seat assembly 1 and the folding mechanism 4, the seat adjustment mechanism 5 includes a base 51 and a seat moving assembly 52 connected to the seat assembly 1, the base 51 is fixedly connected to the top of the folding mechanism 4, and the seat moving assembly 52 is slidably connected to the base 51.

[0043] In this embodiment, the seat moving assembly 52 includes a mounting seat 521 and a moving adjustment component 522. The seat assembly 1 is fixedly connected to the mounting seat 521. A slide rail is provided on the base 51. The mounting seat 521 is slidably connected to the base 51 through the slide rail to drive the seat assembly 1 to slide relative to the base 51. When the folding mechanism 4 is in the unfolded position, the mounting seat 521 is controlled to move along the slide rail to adjust the space in front of the seat assembly 1 to accommodate people of different sizes; when the folding mechanism 4 needs to be converted to the folding position, the mounting seat 521 is controlled to move forward along the slide rail so that the armrest lifting assembly 32 drives the armrest assembly 31 to flip backward to avoid interference between the armrest assembly 31 and other components on the scooter, thereby ensuring the folding effect. The moving adjustment component 522 is provided on the base 51 and can lock and unlock the mounting seat 521. It is understandable that the movable adjustment component 522 has a variety of structures to choose from. For example, the movable adjustment component 522 includes a locking pin 5221 that can rotate around a rotation center and an adjustment fixing portion 5222 provided on the base 51. The locking pin 5221 is inserted into the adjustment fixing portion 5222. A positioning block 5223 is fixedly connected to the locking pin 5221. The positioning block 5223 is located in the adjustment fixing portion 5222. Accordingly, a plurality of slots 5211 are provided at the side of the mounting seat 521 along the moving direction of the mounting seat 521. The positioning block 5223 can be engaged with the slots 5211. The movable adjustment component also includes a torsion spring, which is sleeved on the locking pin 5221 and connected to the adjustment fixing portion 5222. The torsion spring plays a resetting role. When the torsion spring is in the initial state, the positioning block 5223 is engaged with the slot 5211; if the mounting seat 521 needs to be unlocked so that the mounting seat 521 can move along the slide rail, the locking pin 5221 needs to be rotated to rotate the positioning block 5223 in a direction away from the slot 5211 to release the limit on the mounting seat 521. At this time, the torsion spring undergoes elastic deformation. After the mounting seat 521 is adjusted into place, the external force is removed, the torsion spring is reset, and the positioning block 5223 is engaged with the slot 5211.

[0044] In one embodiment, the folding seat structure also includes a seat adjustment mechanism 5 arranged between the seat assembly 1 and the folding mechanism 4, the seat adjustment mechanism 5 includes a seat rotation assembly 53 for supporting the seat assembly 1, and the seat rotation assembly 53 is rotatably connected to the folding mechanism 4 to drive the seat assembly 1 to rotate relative to the folding mechanism 4.

[0045] In the present embodiment, there are two ways to set the seat rotation assembly 53. One is to directly rotationally connect the seat rotation assembly 53 to the top of the folding mechanism 4 (not shown in the figure), so that the seat assembly 1 only has a rotation function; the other is to set the seat rotation assembly 53 on the basis of the previous embodiment, that is, to rotationally connect the seat rotation assembly 53 to the seat movement assembly 52, specifically, the seat rotation assembly 53 is rotationally connected to the mounting seat 521, and the seat assembly 1 is fixed on the seat rotation assembly 53, so that the seat assembly 1 has both a movement function and a rotation function. When the seat rotation assembly 53 is set in a way that it is directly rotationally connected to the top of the folding mechanism 4, the seat rotation assembly 53 drives the seat assembly 1 to rotate 90° to the left or right compared to when the seat assembly 1 is facing forward, which can facilitate the user to sit on the seat assembly 1 or leave the seat assembly 1. When the user leaves the seat assembly 1, there is no need to turn the seat assembly 1 back to the forward position, and the entire adjustable seat structure can be folded (refer to Figure 4Specifically, the folding mechanism 4 is switched to the folding position, the armrest lifting assembly 32 is lowered, and the armrest lifting assembly 32 is moved along the armrest moving assembly 34 to shorten the distance between the two armrest assemblies 31, and then the armrest lifting assembly 32 is rotated around the axis of the armrest rotating assembly 33. At this time, the rotated armrest lifting assembly 32 is almost parallel to the width direction of the seat assembly 1. The advantage of this method is that since the front space of the scooter body is large and the space in the width direction is relatively open, it can effectively avoid the situation where the armrest assembly 31 interferes with the parts on the scooter when the armrest lifting assembly 32 drives the armrest assembly 31 to rotate. When the seat rotating assembly 53 is arranged in such a way that the seat rotating assembly 53 is connected to the seat moving assembly 52 by rotation, the seat rotating assembly 53 drives the seat assembly 1 to rotate 90° to the left or right compared to when the seat assembly 1 is facing forward, so that the user can sit on the seat assembly 1 or leave the seat assembly 1 conveniently. When the user leaves the seat assembly 1, the entire adjustable seat structure can be folded without rotating the seat assembly 1 back to the forward position. Specifically, the folding mechanism 4 is switched to the folding position, the armrest lifting assembly 32 is lowered, and the armrest lifting assembly 32 is moved along the armrest moving assembly 34 to shorten the distance between the two armrest assemblies 31, and then the armrest lifting assembly 32 is rotated around the axis of the armrest rotating assembly 33. At this time, the rotated armrest lifting assembly 32 is almost parallel to the width direction of the seat assembly 1. Finally, according to the specific position of the armrest mechanism 3 after folding, the position of the seat moving assembly 52 on the base 51 is adjusted. The advantage of this method is that, since the front space of the scooter body is large and the space in the width direction is relatively open, it can effectively avoid the situation where the armrest assembly 31 interferes with the parts on the scooter when the armrest lifting assembly 32 drives the armrest assembly 31 to rotate. In addition, since the base 51 and the seat moving assembly 52 are provided, the folding seat structure can be adjusted more flexibly, further improving the space utilization rate and making the use of space more reasonable. It can be understood that the specific folding steps can be operated according to actual conditions and are not limited to the above steps. The order of adjusting each part can be reversed.

[0046] In one embodiment, the seat rotation assembly 53 includes a turntable 531, an elastic member 532, and a rotation adjustment component 533 connected to the elastic member 532. The elastic member 532 is fixedly connected to the lower surface of the turntable 531, and the rotation adjustment component 533 is used to position the elastic member 532 on a path rotating around the rotation axis of the turntable 531. The rotation adjustment component 533 has a locked state and an unlocked state. When the rotation adjustment component 533 is in the locked state, the elastic member 532 and the rotation adjustment component 533 are engaged and limited; when an external force is applied to the rotation adjustment component 533, the rotation adjustment component 533 is converted to an unlocked state, so that the turntable 531 and the elastic member 532 can rotate freely and synchronously.

[0047] In this embodiment, when the seat rotating assembly 53 is directly connected to the top of the folding mechanism 4 (not shown in the figure), the rotating adjustment component 533 includes a bearing seat fixed to the top of the folding mechanism 4, and a first positioning hole is provided on the bearing seat. The elastic member 532 includes a fixed end fixedly connected to the turntable 531 and capable of rotating with the turntable 531 and a free end in contact with the bearing seat. The rotating adjustment component 533 also includes a positioning portion 5331 provided on the lower surface of the free end and a handheld portion 5332 fixedly connected to the free end. The lower surface of the seat assembly 1, the armrest moving assembly 34 and the upper surface of the turntable 531 are fixedly connected. When the rotating adjustment component 533 is in a locked state, the positioning portion 5331 is engaged with the first positioning hole; when an external force is applied to the handheld portion 5332, the elastic member 532 is elastically deformed to separate the positioning portion 5331 from the first positioning hole, and the rotating adjustment component 533 is converted into an unlocked state. Among them, at least three first positioning holes are provided on the bearing seat, and the three first positioning holes are located on the same circumference and are arranged at intervals of 90 degrees to ensure that the seat assembly 1 can be positioned at least at three positions on the path of rotation around the rotating axis of the turntable 531, that is, the seat assembly 1 can be oriented at least in three different directions. When the seat rotating assembly 53 is arranged in a manner of rotationally connecting the seat rotating assembly 53 with the seat moving assembly 52, the elastic member 532 includes a fixed end fixedly connected to the turntable 531 and capable of rotating with the turntable 531 and a free end fitted with the mounting seat 521, the rotation adjustment component 533 includes a second positioning hole 5212 provided on the mounting seat 521, a positioning portion 5331 provided on the lower surface of the free end, and a hand-held portion 5332 fixedly connected to the free end, and the lower surface of the seat assembly 1, the armrest moving assembly 34 and the upper surface of the turntable 531 are fixedly connected. When the rotation adjustment component 533 is in a locked state, the positioning portion 5331 and the second positioning hole 5212 are engaged; when an external force is applied to the hand-held portion 5332, the elastic member 532 is elastically deformed to separate the positioning portion 5331 from the second positioning hole 5212, and the rotation adjustment component 533 is converted to an unlocked state. Among them, at least three second positioning holes 5212 are provided on the mounting seat 521, and the three second positioning holes 5212 are located on the same circumference and are arranged at intervals of 90 degrees to ensure that the seat assembly 1 can be positioned at least at three positions on the path of rotation around the axis of the rotating disk 531, that is, the seat assembly 1 can be oriented in at least three different directions.

[0048] Reference Figure 8As shown, in other embodiments, the seat moving assembly 52 includes a first seat support 523, and the seat rotating assembly 53 includes a second seat support 534 and a limiting assembly 535. The first seat support 523 is slidably connected with the second seat support 534, and the first seat support 523 can slide along the length direction of the second seat support 534. The second seat support 534 is rotatably connected with the limiting assembly 535, and the second seat support 534 can rotate around the axis of the limiting assembly 535. The second seat support 534 is provided with a plurality of first limiting holes 5341, which are arranged at intervals along the length direction of the second seat support 534. The first locking assembly 524 is penetrated through the first seat support 523 and can be locked with the first limiting hole 5341 on the second seat support 534, so that the first seat support 523 and the second seat support 534 can be limited and released. The limiting assembly 535 is specifically a pipe, and a plurality of second limiting holes 5351 are formed on the circumference of the limiting assembly 535. The second locking assembly 536 is penetrated on the second seat support 534 and can be locked with the second limiting holes 5351 on the limiting assembly 535 in the second seat support 534, so that the second seat support 534 and the limiting assembly 535 can be limited and released. The second seat support 534 is equivalent to the base 51.

[0049] In one embodiment, the armrest rotating assembly 33 includes a rotating shaft component 331 and a rotating control component 332. One end of the armrest lifting assembly 32 away from the armrest assembly 31 is sleeved on the rotating shaft component 331, and the armrest lifting assembly 32 can rotate around the axis of the rotating shaft component 331. The rotating shaft component 331 and the armrest lifting assembly 32 are connected through the rotating control component 332. The rotating control component 332 has an initial position and a terminal position in the length direction of the rotating shaft component 331. When the rotating control component 332 is located at the terminal position, the armrest lifting assembly 32 can rotate freely around the rotating shaft component 331; when the armrest lifting assembly 32 rotates to a specific position, the rotating control component 332 rebounds from the terminal position to the initial position to limit the rotation of the armrest lifting assembly 32.

[0050] In this embodiment, the end of the armrest lifting assembly 32 connected to the shaft component 331 is defined as the rotating end, and an axial hole is provided on the rotating end. Two bearing parts 3221 and a receiving groove 3222 for receiving the rotating control component 332 are provided on the hole wall of the axial hole. The two bearing parts 3221 are respectively located on both sides of the receiving groove 3222, and the rotating control component 332 can move axially along the rotating end in the receiving groove 3222. The end of the shaft component 331 connected to the armrest lifting assembly 32 is defined as the connecting end, and a guide part 3311 is provided on the outer periphery of the connecting end. The guide part 3311 is in contact with the bearing part 3221. When the armrest lifting assembly 32 rotates, the two bearing parts 3221 and the receiving groove 3222 jointly form a guide track for the guide part 3311 to pass through. The rotation control component 332 includes a limiting portion, which is connected to the bottom of the receiving groove 3222 through an elastic component. When the elastic component is in a free state, the rotation control component 332 is located at the initial position, and the limiting portion and the guide portion 3311 are located in the same plane to limit the rotation of the armrest lifting component 32; when the elastic component is in a compressed state, the rotation control component 332 is located at the end position, and the limiting portion is flush with the two bearing portions 3221 to form a guide track. A stopper 3223 is formed along the hole wall of the shaft hole between the two bearing portions 3221, and the stopper 3223 is located on the side away from the receiving groove 3222. Among them, when the armrest lifting component 32 rotates to overlap with the bearing portion 3221 and avoids the receiving groove 3222, the rotation control component 332 rebounds from the end position to the initial position, and the guide portion 3311 is limited between the limiting portion and the stopper 3223. It is understandable that when the rotation control component 332 is pressed along the depth direction of the accommodating groove 3222 until the rotation control component 332 no longer blocks the rotation shaft component 331, that is, the relative rotation of the armrest lifting assembly 32 and the rotation shaft component 331 is no longer restricted in the circumferential direction of the rotation shaft component 331, the relative limit between the armrest lifting assembly 32 and the rotation shaft component 331 is unlocked, so that the armrest lifting assembly 32 can rotate around the rotation shaft component 331 and drive the armrest assembly 31 to flip in the direction of avoiding getting on and off the scooter. During the rotation of the armrest lifting assembly 32 around the rotation shaft component 331, the rotation control component 332 is always pressed by the guide part 3311 on the rotation shaft component 331, and the position of the guide part 3311 relative to the rotation end can be from one bearing part 3221 to the other bearing part 3221 through the top of the rotation control component 332. When the armrest lifting assembly 32 rotates to a specific position, that is, when the armrest lifting assembly 32 rotates back to the original vertical position, the rotation control component 332 is no longer pressed by the guide portion 3311, so the rotation control component 332 rebounds to the initial position, and the armrest lifting assembly 32 and the shaft component 331 are limited again to prevent the two from rotating relative to each other.The function of the stopper 3223 is to limit the armrest lifting assembly 32 together with the rotation control component 332 when it is in the initial position, so as to prevent the armrest lifting assembly 32 from rotating relative to the shaft component 331. By providing the rotation control component 332, the folding and unfolding of the armrest lifting assembly 32 is facilitated, which is safer and more stable than the damping control structure.

[0051] Reference Figures 9 to 11 As shown, in one embodiment, the armrest lifting assembly 32 includes a lifting and adjusting component 321 and a support rod 322, the armrest assembly 31 is connected to the lifting and adjusting component 321, and the lifting and adjusting component 321 is sleeved on the support rod 322 to drive the armrest assembly 31 to move along the length direction of the support rod 322; the armrest moving assembly 34 includes a hollow sleeve 341 fixed to the lower surface of the seat assembly 1, and the armrest rotating assembly 33 is inserted into the hollow sleeve 341 to drive the two armrest assemblies 31 to move in the direction of approaching or moving away along the width direction of the seat assembly 1.

[0052] In this embodiment, the support rod 322 is connected to the rotating shaft component 331. The armrest lifting assembly 32 has a variety of implementation forms, which are all reflected in the existing solutions and will not be described in detail here. The armrest moving assembly 34 also includes a locking component 342 arranged on the hollow sleeve 341. The rotating shaft component 331 is inserted into the hollow sleeve 341 and can move along the length direction of the hollow sleeve 341. The locking component 342 is used to limit the movement of the rotating shaft component 331 in the length direction of the hollow sleeve 341. The locking component 342 can specifically be a buckle, a pull rod or a fastener, as long as it can lock the rotating shaft component 331 to prevent it from moving relative to the hollow sleeve 341, and can unlock the rotating shaft component 331 so that it can move relative to the hollow sleeve 341. The armrest mechanism 3 integrates lifting and moving functions. When the user is not using the vehicle, the height of the armrest assembly 31 can be lowered and the distance between the two armrest assemblies 31 can be retracted into the vehicle to reduce the space occupied by the armrest mechanism 3.

[0053] Reference Fig.12 As shown, in one embodiment, the folding mechanism 4 includes a front arm 41, a rear arm 42 and a seat bracket 43, the seat assembly 1 and the seat bracket 43 are fixedly connected, the top end of the front arm 41 is hinged to the front end of the seat bracket 43, the bottom end of the front arm 41 is hinged to the frame, the top end of the rear arm 42 is hinged to the rear end of the seat bracket 43, and the bottom end of the rear arm 42 is hinged to the frame.

[0054] In this embodiment, the folding mechanism 4 is a four-bar mechanism, and the connection between the top of the front arm 41 and the seat bracket 43, the connection between the top of the rear arm 42 and the seat bracket 43, the connection between the bottom of the front arm 41 and the frame, and the connection between the bottom of the rear arm 42 and the frame can all be provided with a damping control structure, which is used to lock the front arm 41 and the rear arm 42 at a specific position after rotating around the frame. It should be noted that when the damping control structure is selected, the damping control structure needs to be designed on the basis of ensuring the stability and safety of the user when using the seat assembly 1 normally, so that the folding mechanism 4 can be folded and unfolded. Alternatively, the front arm 41 and the rear arm 42 are locked by setting a mechanical control structure. When the mechanical control structure is set, the rotation position is limited or adjusted by designing a specific mechanical structure. Common mechanical structure control methods include but are not limited to key connection, pin connection or threaded connection.

[0055] Furthermore, in one embodiment, the folding mechanism 4 also includes a sliding component 44, the seat bracket 43 is provided with a sliding groove 431, the sliding component 44 is slidably connected to the sliding groove 431, the forearm 41 is provided with a groove 411, and when the sliding component 44 slides along the sliding groove 431 into the groove 411, the seat bracket 43, the forearm 41 and the rear arm 42 are fixed.

[0056] In this embodiment, when the seat assembly 1 needs to be unfolded, the seat bracket 43 is raised until the slide groove 431 is directly opposite to the groove 411 of the front arm 41, and then the sliding assembly 44 is slid into the groove 411 of the front arm 41 to fix the seat bracket 43, the front arm 41 and the rear arm 42. Afterwards, when the seat assembly 1 needs to be folded, the sliding assembly 44 is moved away from the groove 411 of the front arm 41 to unlock it, and then the seat bracket 43 is lowered. Through the design of the folding mechanism 4, the volume can be greatly reduced when the folding seat structure is not in use, so that the user can easily carry the scooter to public transportation, carry it manually for a short distance, or store it in a limited space, thereby improving portability, optimizing storage space, and enhancing transportation convenience.

[0057] Reference Figure 13 to Figure 15 As shown, the present disclosure further provides a folding mobility scooter, comprising a frame 7, a driving wheel group 8, a steering wheel group 9 and an auxiliary moving wheel group 10, comprising a handlebar mechanism 6 and a folding seat structure in any one of the above-mentioned embodiments, the handlebar mechanism 6 comprising a connecting assembly 61 fixed to the front end of the frame 7 and a handlebar assembly 62 rotatably connected to the connecting assembly 61, when the folding seat structure as a whole is in a folded state, the handlebar assembly 62 is folded relative to the connecting assembly 61 to above the folding seat structure.

[0058] In this embodiment, the driving wheel set 8 is usually the rear wheel of the folding scooter, the steering wheel set 9 is usually the front wheel of the folding scooter, the number of wheels in the steering wheel set 9 can be one or two, and the embodiments shown in the present disclosure are all based on the number of wheels in the steering wheel set 9 as one. The auxiliary mobile wheel set 10 is usually arranged near the ground at the rear end of the folding scooter. When the folding scooter is running normally, the auxiliary mobile wheel set 10 forms a certain distance from the ground and does not affect the running of the folding scooter. When the folding scooter is folded, the auxiliary mobile wheel set 10 can enhance the mobility and portability of the folding scooter. Specifically, the folding scooter is designed to reduce the volume when it is not needed, so as to facilitate transportation and storage, and the auxiliary mobile wheel set 10 is still attached to the folding scooter and connected to the frame 7 after folding, so that the entire structure can be easily moved even in the folded state without additional manpower. The auxiliary moving wheel set 10 can be specifically designed as a retractable and wheelbase adjustable structure. This adjustability allows the auxiliary moving wheel set 10 to adjust the distance from the ground and the wheelbase as needed to ensure the stability and mobility of the structure. The handlebar mechanism 6 has a variety of implementation forms, which are all reflected in the existing solutions. No further details will be given here, as long as it can be rotated and folded relative to the frame 7. The folding scooter in the present disclosure is provided with a folding seat structure. The folding seat structure is designed through the backrest mechanism 2, the armrest mechanism 3 and the folding mechanism 4, so that the backrest mechanism 2 can be stored in the seat assembly 1 after use and folded into a relatively flat shape. The folding mechanism 4 can lower and fold the overall structure of the seat, so that the volume of the folding scooter can be greatly reduced when not in use, which is convenient for users to carry, transport and store easily. In addition, the folding mechanism 4 is arranged at the center position in the width direction of the frame 7, so that the seat as a whole is smoother when folding and unfolding, while reducing the occupation of the space on both sides of the folding scooter, and removing the restriction on the user's activity space; in addition, the armrest mechanism 3 integrates the lifting function, the rotation function and the movement function. When the user does not use the folding scooter, not only can the height of the armrest assembly 31 be lowered and the distance between the two armrest assemblies 31 be retracted into the folding scooter to reduce the space occupied by the armrest mechanism 3, but also the armrest rotating assembly 33 can be combined to drive the armrest assembly 31 to rotate so as to facilitate storage to a smaller volume.

[0059] Furthermore, in one embodiment, the handlebar mechanism 6 also includes a folding assembly 63, which includes a first folding member 631 connected to the connecting assembly 61 and a second folding member 632 connected to the handlebar assembly 62. The first folding member 631 and the second folding member 632 are rotatably connected, and a locking member 633 is arranged between the first folding member 631 and the second folding member 632. The locking member 633 is coaxially arranged with the first folding member 631, and the locking member 633 can rotate around a common axis relative to the first folding member 631.

[0060] In this embodiment, the locking member 633 has a first position and a second position. When the locking member 633 is located at the first position, the locking member 633 locks the second folding member 632 to limit the relative rotation of the second folding member 632 relative to the first folding member 631. When the locking member 633 is located at the second position, the locking member 633 avoids the second folding member 632 to release the limit between the second folding member 632 and the first folding member 631. The first folding member 631 and the second folding member 632 are rotatably connected, so that the second folding member 632 can rotate relative to the first folding member 631 around a rotation axis. The second folding member 632 is fixedly connected to the handlebar assembly 62, so that the handlebar assembly 62 can be folded toward the direction close to the connecting assembly 61 along with the second folding member 632. The folding assembly 63 has an upright state and a folding state. When the folding assembly 63 is in the upright state, the first folding member 631 and the second folding member 632 are coaxially arranged. When the folding assembly 63 is in the folding state, the second folding member 632 is folded together with the first folding member 631, and the axis of the first folding member 631 is parallel to the axis of the second folding member 632. The locking member 633 is used to lock the second folding member 632 when the folding assembly 63 is in the upright state, so that the handlebar mechanism 6 maintains a stable working state. Since the locking member 633 is coaxially arranged with the first folding member 631 and can only rotate relative to the first folding member 631 around a common axis, the second folding member 632 can be clamped at a position coaxial with the first folding member 631 when the locking member 633 rotates to the first position, preventing the second folding member 632 from folding around the first folding member 631 toward the connecting component 61; when the locking member 633 rotates to the second position, the restriction on the second folding member 632 is released, and the second folding member 632 can rotate freely around the first folding member 631. Since the folding scooter has a handlebar mechanism 6, the handlebar mechanism 6 includes a folding assembly 63, and the locking member 633 in the folding assembly 63 rotates to the first position around the axis of the first folding member 631, the first folding member 631 and the second folding member 632 can be locked together. When folding is required, the locking member 633 can be rotated to the second position to release the restriction on the second folding member 632. The structure is simple, the operation is convenient, and the space occupied is small and the weight is light, which can improve the user experience.

[0061] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0063] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A folding seat structure, comprising a seat assembly (1), characterized in that: Also includes: A backrest mechanism (2) is rotatably connected to the seat assembly (1) and can be folded relative to the seat assembly (1); An armrest mechanism (3), comprising an armrest assembly (31), an armrest lifting assembly (32), an armrest rotating assembly (33) and an armrest moving assembly (34); the armrest moving assembly (34) is fixedly connected to the lower surface of the seat assembly (1) and is arranged along the width direction of the seat assembly (1); the armrest rotating assembly (33) is slidably connected to the armrest moving assembly (34) and can slide along the length direction of the armrest moving assembly (34); one end of the armrest lifting assembly (32) is rotatably connected to the armrest rotating assembly (33); and the armrest assembly (31) is arranged on the other end of the armrest lifting assembly (32); and A folding mechanism (4), wherein the seat assembly (1) is arranged at the top end of the folding mechanism (4), and the bottom end of the folding mechanism (4) is hinged to the center position of the frame in the width direction and can be switched between an unfolded position and a folded position relative to the frame.

2. The folding seat structure according to claim 1, characterized in that: The invention also comprises a seat adjustment mechanism (5) arranged between the seat assembly (1) and the folding mechanism (4), wherein the seat adjustment mechanism (5) comprises a base (51) and a seat moving assembly (52) connected to the seat assembly (1), wherein the base (51) is fixedly connected to the top end of the folding mechanism (4), and the seat moving assembly (52) is slidably connected to the base (51).

3. The folding seat structure according to any one of claims 1 or 2, characterized in that: It also includes a seat adjustment mechanism (5) arranged between the seat assembly (1) and the folding mechanism (4), wherein the seat adjustment mechanism (5) includes a seat rotation assembly (53) for supporting the seat assembly (1), and the seat rotation assembly (53) is rotatably connected to the folding mechanism (4) to drive the seat assembly (1) to rotate relative to the folding mechanism (4).

4. The folding seat structure according to claim 3, characterized in that: The seat rotating assembly (53) comprises a rotating disk (531), an elastic member (532) and a rotating adjustment component (533) connected to the elastic member (532), wherein the elastic member (532) is fixedly connected to the lower surface of the rotating disk (531), and the rotating adjustment component (533) is used to position the elastic member (532) on a rotating path around the rotating axis of the rotating disk (531); The rotation adjustment component (533) has a locked state and an unlocked state. When the rotation adjustment component (533) is in the locked state, the elastic member (532) and the rotation adjustment component (533) are engaged and limited. When an external force is applied to the rotation adjustment component (533), the rotation adjustment component (533) is converted into an unlocked state, so that the rotating disk (531) and the elastic member (532) can rotate freely and synchronously.

5. The folding seat structure according to claim 1, characterized in that: The handrail rotating assembly (33) comprises a rotating shaft component (331) and a rotating control component (332); one end of the handrail lifting assembly (32) away from the handrail assembly (31) is sleeved on the rotating shaft component (331), and the handrail lifting assembly (32) can rotate around the axis of the rotating shaft component (331); the rotating shaft component (331) and the handrail lifting assembly (32) are connected via the rotating control component (332); The rotation control component (332) has an initial position and a terminal position in the length direction of the rotating shaft component (331); when the rotation control component (332) is located at the terminal position, the armrest lifting assembly (32) can freely rotate around the rotating shaft component (331); when the armrest lifting assembly (32) rotates to a specific position, the rotation control component (332) rebounds from the terminal position to the initial position to limit the rotation of the armrest lifting assembly (32).

6. The folding seat structure according to claim 1, characterized in that: The armrest lifting assembly (32) comprises a lifting adjustment component (321) and a support rod (322), the armrest assembly (31) is connected to the lifting adjustment component (321), the lifting adjustment component (321) is sleeved on the support rod (322) to drive the armrest assembly (31) to move along the length direction of the support rod (322); the armrest moving assembly (34) comprises a hollow sleeve (341) fixed to the lower surface of the seat assembly (1), the armrest rotating assembly (33) is inserted into the hollow sleeve (341) to drive the two armrest assemblies (31) to move in a direction of approaching or moving away from each other along the width direction of the seat assembly (1).

7. The folding seat structure according to claim 1, characterized in that: The folding mechanism (4) comprises a front arm (41), a rear arm (42) and a seat bracket (43); the seat assembly (1) and the seat bracket (43) are fixedly connected; the top end of the front arm (41) is hinged to the front end of the seat bracket (43); the bottom end of the front arm (41) is hinged to the frame; the top end of the rear arm (42) is hinged to the rear end of the seat bracket (43); and the bottom end of the rear arm (42) is hinged to the frame.

8. The folding seat structure according to claim 7, characterized in that: The folding mechanism (4) further comprises a sliding assembly (44); the seat support (43) is provided with a sliding groove (431); the sliding assembly (44) is slidably connected to the sliding groove (431); the front arm (41) is provided with a groove (411); when the sliding assembly (44) slides along the sliding groove (431) into the groove (411), the seat support (43), the front arm (41) and the rear arm (42) are fixed.

9. A foldable scooter, comprising a frame (7), a driving wheel set (8), a steering wheel set (9) and an auxiliary moving wheel set (10), characterized in that: The vehicle further comprises a handlebar mechanism (6) and a folding seat structure as claimed in any one of claims 1 to 8, wherein the handlebar mechanism (6) comprises a connecting assembly (61) fixed to the front end of the frame (7) and a handlebar assembly (62) rotatably connected to the connecting assembly (61); when the folding seat structure as a whole is in a folded state, the handlebar assembly (62) is folded relative to the connecting assembly (61) to the top of the folding seat structure.

10. The foldable scooter according to claim 9, characterized in that: The handlebar mechanism (6) also includes a folding assembly (63), which includes a first folding member (631) connected to the connecting assembly (61) and a second folding member (632) connected to the handlebar assembly (62); the first folding member (631) and the second folding member (632) are rotatably connected; a locking member (633) is provided between the first folding member (631) and the second folding member (632); the locking member (633) is coaxially arranged with the first folding member (631), and the locking member (633) can rotate relative to the first folding member (631) around a common axis.

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