Foldable mobile device and folding method thereof

Abstract

The invention provides a foldable mobile device and a folding method thereof, the foldable mobile device comprises a front wheel frame assembly, a rear wheel frame assembly, a backrest support and a connecting member, the front wheel frame assembly comprises a seat surface support, and the rear wheel frame assembly and the front wheel frame assembly are rotatably connected to form a first rotating connection position; the backrest bracket and the seat surface bracket are rotatably connected to form a second rotating joint; the connecting component is rotationally connected with the rear wheel frame assembly to form a third rotating joint, and the connecting component is further rotationally connected with the backrest support to form a fourth rotating joint; in the unfolded state, the first rotating connection position, the second rotating connection position, the third rotating connection position and the fourth rotating connection position are distributed in a quadrilateral mode, so that the front wheel frame assembly, the rear wheel frame assembly, the backrest support and the connecting component form a four-connecting-rod mechanism. The mobile equipment is simple in folding structure, few in folding steps and labor-saving in folding operation, and different people can flexibly select folding operation positions according to needs.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of mobile devices, and more particularly to a foldable mobile device and a folding method thereof. Background Art

[0002] A known type of mobile device is a walking tool for special groups of people such as the disabled, the elderly and infirm, the people with difficulty walking, the limbs injured and the medical clinical rehabilitation patients.

[0003] In order to facilitate carrying, storage, transportation and storage, such mobile devices are designed to be foldable, and the length or volume of the whole vehicle can be reduced after folding. At present, in the process of folding such mobile devices, there are technical problems such as a complex folding structure, a low folding operation position, a large force required for the folding operation, and a large number of folding steps. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a foldable mobile device and a folding method thereof.

[0005] The foldable mobile device provided by this application includes:

[0006] A front wheel frame assembly, the front wheel frame assembly comprising a seat support, the seat support being used for a passenger to sit on in an unfolded state;

[0007] A rear wheel frame assembly, wherein the rear wheel frame assembly is rotatably connected to the front wheel frame assembly, and the rotation connection is a first rotation connection;

[0008] A backrest bracket, the backrest bracket is rotatably connected to the seat bracket and can swing forward and backward relative to the seat bracket, the rotation connection is a second rotation connection, and the backrest bracket is used for the passenger to lean on in the unfolded state;

[0009] A connecting member, wherein the connecting member is rotatably connected to the rear wheel frame assembly, and the rotational connection is a third rotational connection. The connecting member is also rotatably connected to the backrest bracket, and the rotational connection is a fourth rotational connection.

[0010] In the unfolded state, the first rotation connection, the second rotation connection, the third rotation connection and the fourth rotation connection are distributed in a quadrilateral, so that the front wheel frame assembly, the rear wheel frame assembly, the backrest bracket and the connecting member form a four-bar linkage.

[0011] The folding method of the foldable mobile device is: operate any one or any multiple of the front wheel frame assembly, the rear wheel frame assembly, the backrest bracket and the connecting member to rotate to realize the folding of the foldable mobile device.

[0012] The folding structure of the present application is simple, the folding steps are few, and the folding operation is labor-saving. Different people can flexibly choose the folding operation position according to their needs. For example, for people with waist discomfort, they can manually operate the backrest bracket to fold or use their feet to operate the front wheel frame assembly or the rear wheel frame assembly to fold without bending over. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 A schematic diagram of the structure of a foldable mobile device in an unfolded state provided in Embodiment 1 of the present application;

[0015] Figure 2 A schematic structural diagram of another angle of the foldable mobile device embodiment 1 provided in embodiment 1 of the present application in an unfolded state;

[0016] Figure 3 A left view of the foldable mobile device in the unfolded state provided in the first embodiment of the present application;

[0017] Figure 4 A left view of the foldable mobile device provided in the first embodiment of the present application during the folding process;

[0018] Figure 5 A left view of the foldable mobile device in a folded state provided in Embodiment 1 of the present application;

[0019] Figure 6 A left view of the armrest of the foldable mobile device provided in the first embodiment of the present application sliding backward to a certain position;

[0020] Figure 7 A left view of the foldable mobile device armrest provided in the first embodiment of the present application sliding forward to a certain position;

[0021] Figure 8 A schematic diagram of a foldable mobile device armrest and an armrest bracket provided in Embodiment 1 of the present application being slidably connected via a slide groove;

[0022] Fig. 9 An internal view of the foldable mobile device armrest provided in the first embodiment of the present application sliding backward along the armrest bracket to the extreme position;

[0023] Fig.10An internal view of the foldable mobile device armrest provided in the first embodiment of the present application sliding forward along the armrest bracket to the limit position;

[0024] Fig.11 A schematic diagram of two positions of a pedal member of a foldable mobile device provided in Embodiment 1 of the present application;

[0025] Fig.12 A schematic diagram of a method of using a foldable mobile device when passing through stairs provided in the first embodiment of the present application;

[0026] Fig.13 A position diagram of a first limiting member and a limiting pin of a foldable mobile device provided in the first embodiment of the present application in an unfolded state;

[0027] Fig.14 A position diagram of a first limiting member and a limiting pin of a foldable mobile device in a folded state provided in Embodiment 1 of the present application;

[0028] Fig.15 A diagram showing the position of a release pedal when the foldable mobile device is limited in position provided in the first embodiment of the present application;

[0029] Fig.16 A position diagram of a time-limit release pedal for a foldable mobile device provided in Example 1 of the present application;

[0030] Fig.17 A diagram showing a foldable mobile device with its handle facing forward provided in Embodiment 1 of the present application;

[0031] Fig.18 A diagram showing a foldable mobile device with its handle facing backwards provided in Embodiment 1 of the present application;

[0032] Fig.19 A diagram showing a foldable mobile device with its handle facing inwards provided in Embodiment 1 of the present application;

[0033] Fig. 20 A structural diagram of a locking and unlocking mechanism for a foldable mobile device provided in Embodiment 1 of the present application;

[0034] Fig.21 A diagram showing the matching of the locking tooth sleeve and the locking tooth block corresponding to the locking and unlocking mechanism of the foldable mobile device provided in the first embodiment of the present application, which restricts the handle to the forward, backward and inward positions respectively;

[0035] Fig. 22 A structural diagram of a locking tooth block of a locking and unlocking mechanism for a foldable mobile device provided in Example 1 of the present application;

[0036] Fig.23 A structural diagram of a locking gear sleeve of a locking and unlocking mechanism of a foldable mobile device provided in Example 1 of the present application;

[0037] Fig.24 An angle diagram of a backrest and a seat cushion of a foldable mobile device provided in Embodiment 1 of the present application in an unfolded state;

[0038] Fig.25 A diagram showing the curved shape of the backrest of the foldable mobile device in the horizontal direction provided in the first embodiment of the present application;

[0039] Fig.26 is a schematic structural diagram of a foldable portable electric mobile device in an unfolded state provided in Embodiment 2 of the present application;

[0040] Fig. 27 It is a left view of the foldable portable electric mobile device provided in the second embodiment of the present application in the unfolded state;

[0041] Fig.28 is a structural schematic diagram of a foldable portable electric mobile device during folding provided in Embodiment 2 of the present application;

[0042] Fig.29 It is a left view of the foldable portable electric mobile device provided in the second embodiment of the present application during the folding process;

[0043] Fig.30 This is a schematic structural diagram of a foldable portable electric mobile device in a folded state provided in Embodiment 2 of the present application;

[0044] Fig.31 It is a left view of a foldable portable electric mobile device in a folded state provided in the second embodiment of the present application;

[0045] Reference numerals: 100 mobile devices; 200 front wheel frame assembly, 201 seat support, 202 front frame, 203 pedal member, 204 front support wheel, 205 front wheel; 300 rear wheel frame assembly, 301 handrail assembly, 3011 handrail bracket, 3012 handrail, 3013 stopper, 3014 ball bearing, 3015 spring, 303 rear wheel, 304 rear anti-dumping member, 305 rear support wheel; 400 central control module, 401 central control handle; 500 backrest bracket; 600 handle, 601 control part; 700 connecting components; 800 limiting mechanism, 801 first limiting member, 8011 folding limiting groove, 8012 unfolding limiting groove, 8013 stopper, 802 limiting pin, 803 first elastic reset member, 804 second limiting member; 900 release mechanism, 901 release pedal, 902 release transmission member; 1000 locking and unlocking mechanism, 1001 locking tooth block, 1002 locking tooth sleeve, 1003 second elastic reset member, A lengthened tooth; 1100 cushion; 1200 backrest; 1300 controller module; 1400 battery module; 1500 hooks; 1600 hand rest. DETAILED DESCRIPTION

[0046] The present application is further described in detail below in conjunction with the accompanying drawings and implementation methods. It is particularly noted that the following implementation methods are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following implementation methods are only some implementation methods of the present application rather than all implementation methods. All other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0047] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. A process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0048] The terms "disposed" and "connected" in this application should be understood in a broad sense. For example, it can be directly disposed or connected, or it can be indirectly disposed or connected through a central component or a central structure.

[0049] In the embodiments of the present application, if there are terms indicating orientation or positional relationships such as "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "side wall", and "one side", they are based on the orientation or positional relationship or the conventional placement state or usage state shown in the drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structure, feature, device or element referred to must have a specific orientation or positional relationship, nor must it be constructed and operated in a specific orientation. They are only used to explain the relative positional relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly, and therefore cannot be understood as a limitation on the present application.

[0050] The terms "first", "second", and "third" in this application 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. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] The above terms are only for the convenience of description and should not be construed as limitations on the present technical solution.

[0052] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] The specific implementation of this application is described in detail below in conjunction with specific embodiments: Example 1 (reference Figure 1-Figure 24 ):

[0054] like Figure 1 As shown, in this embodiment, the foldable mobile device at least includes a front wheel frame assembly 200 , a rear wheel frame assembly 300 , a backrest bracket 500 and a connecting member 700 .

[0055] The front wheel frame assembly 200 includes a seat support 201. The seat support 201 is used for a passenger to sit on in an unfolded state.

[0056] The rear wheel frame assembly 300 is rotatably connected to the front wheel frame assembly 200, and the rotation connection is a first rotation connection O1 (combined with Figure 3 understand).

[0057] The backrest bracket 500 is rotatably connected to the seat bracket 201, so that the backrest bracket 500 can swing back and forth relative to the seat bracket 201. The rotation connection is the second rotation connection O2 (combined with Figure 3 The backrest bracket 500 is used for the passenger to lean on in the unfolded state.

[0058] The connecting member 700 is rotatably connected to the rear wheel frame assembly 300, and the rotation connection is a third rotation connection O3 (combined with Figure 3 The connecting member 700 is also rotatably connected to the backrest bracket 500, and the rotation connection is the fourth rotation connection O4 (combined with Figure 3 understand).

[0059] like Figure 3 As shown, in the unfolded state, the first rotation connection O1, the second rotation connection O2, the third rotation connection O3, and the fourth rotation connection O4 are distributed in a quadrilateral, so that the front wheel frame assembly 200, the rear wheel frame assembly 300, the backrest bracket 500 and the connecting member 700 form a four-bar linkage.

[0060] The foldable mobile device of the above structure can be folded by operating any one of the front wheel frame assembly 200, the rear wheel frame assembly 300, the backrest bracket 500 and the connecting member 700, thereby meeting the operation needs and operation habits of different groups of people. For example, for people with waist discomfort, they can manually operate the backrest bracket 500 to fold or use their feet to operate the front wheel frame assembly 200 or the rear wheel frame assembly 300 to fold without bending over.

[0061] like Figure 3 As shown, the front wheel frame assembly 200 further includes a front frame 202 and a front wheel 205. The front frame 202 is rigidly connected to the seat support 201. The front wheel 205 is connected to the front frame 202, and the front wheel 205 can rotate relative to the front frame 202. The front wheel 205 is used to contact the ground in the unfolded state. The rear wheel frame assembly 300 further includes a rear frame 302 and a rear wheel 303. The rear frame 302 is rotatably connected to the front frame 202, and the rotation connection is the first rotation connection O1 mentioned above. The rear wheel 303 is connected to the rear frame 302, and the rear wheel 303 can rotate relative to the rear frame 302. The rear wheel 303 is used to contact the ground in the unfolded state.

[0062] Alternatively, if Figure 3 As shown, in the unfolded state, the first rotation connection O1 and the third rotation connection O3 are located in front of the second rotation connection O2 and the fourth rotation connection O4. The third rotation connection O3 and the fourth rotation connection O4 are located above the first rotation connection O1 and the second rotation connection O2. The distance between the first rotation connection O1 and the third rotation connection O3 is L1. The distance between the third rotation connection O3 and the fourth rotation connection O4 is L2. The distance between the second rotation connection O2 and the fourth rotation connection O4 is L3. The distance between the first rotation connection O1 and the second rotation connection O2 is L4. The sum of L1 and L2 is less than the sum of L3 and L4.

[0063] With this design, during the folding process of the mobile device, the backrest bracket 500 first rotates backwards until the first rotation connection O1, the third rotation connection O3, and the fourth rotation connection O4 are in line ( Figure 4 After the backrest bracket 500 is moved to the position shown in the figure, the backrest bracket 500 is rotated forward again to be close to the seat bracket 201. Figure 3 and Figure 4 During the backward rotation of the backrest bracket 500, the lower end of the front wheel frame assembly 200 and the lower end of the rear wheel frame assembly 300 approach each other, the front wheel 205 and the rear wheel 303 approach each other, and the rear side of the seat bracket 201 moves upward and the front side moves downward. Figure 4 and Figure 5 During the forward rotation of the backrest bracket 500, the lower end of the front wheel frame assembly 200 and the lower end of the rear wheel frame assembly 300 are further moved closer to each other, the front wheel 205 and the rear wheel 303 are further moved closer to each other, the rear side of the seat bracket 201 is further moved up, and the front side is further moved down. This makes the front-to-back dimensions of the mobile device very small after it is finally folded, and it is very convenient to store. In addition, during the folding process, the backrest bracket 500 is first rotated backward and then rotated forward, which requires less space than rotating backward all the time, so that the mobile device can be folded in a narrow space.

[0064] Optionally, the rear wheel frame assembly 300 may further include a handrail assembly 301. Figure 6 and Figure 7 As shown, the armrest assembly 301 includes an armrest bracket 3011 and an armrest 3012. The armrest bracket 3011 is rigidly connected to the rear frame 302. The armrest 3012 is slidably connected to the armrest bracket 3011 and can slide forward and backward relative to the armrest bracket 3011. Figure 8 As shown, the armrest 3012 and the armrest bracket 3011 can be slidably connected through a slide groove (indicated by B in the figure). Fig. 9 and Fig.10 As shown, the armrest 3012 is connected to a stopper 3013 at the front and rear ends to limit the front and rear sliding limit of the armrest 3012. Fig. 9 As shown, when the armrest 3012 slides backward to the limit position, the front stopper 3013 contacts the armrest bracket 3011, so that the armrest 3012 can no longer slide backward. Fig.10 As shown, when the armrest 3012 slides forward to the limit position, the stopper 3013 on the rear side contacts the armrest bracket 3011, so that the armrest 3012 can no longer slide forward.

[0065] Alternatively, if Fig. 9 and Fig.10 As shown, the armrest 3012 and the armrest bracket 3011 are provided with a positioning portion, and a plurality of positioning slots 3016 can be sequentially arranged in the front-rear direction, so that as the armrest 3011 slides, the positioning portion can face different positioning slots 3016. When the armrest 3012 slides to the point where the positioning portion faces one positioning slot 3016, the positioning portion can automatically enter the facing positioning slot 3016, so that the armrest 3012 stops at this position. In this way, the armrest 3012 can stop at multiple different positions, so as to meet different user needs.

[0066] Optionally, the positioning part may include a ball 3014 and a ball spring 3015, one end of the ball spring 3015 is installed in a mounting groove on the armrest bracket 3011 or the armrest 3012, and the ball 3014 is arranged at the other end of the ball spring 3015. When the armrest 3012 slides to the positioning part and faces a positioning groove 3016, the ball 3014 automatically enters the facing positioning groove 3016 under the elastic force of the ball spring 3015, so that the armrest 3012 stops at this position. If the armrest 3012 is to be slid again, a certain force needs to be applied to make the ball 3015 escape from the current positioning groove 3016, so as to release the positioning of the armrest 3012. This positioning part structure is relatively easy to release the positioning and can also make the armrest 3012 have a better sliding feel. The structure of the positioning part is not limited to this, for example, it can also be an ordinary positioning pin, which falls into the facing positioning groove by gravity.

[0067] Alternatively, if Fig.11 As shown, the front wheel frame assembly 200 may further include a pedal member 203, which is used to support the feet of the passengers in the unfolded state. The pedal member 203 is rotatably connected to the front frame 202, and can be flipped up and down relative to the front frame 202, and can be flipped downward to a nearly horizontal state, and can be flipped upward to a nearly vertical state, for example, a state with an angle of 95° with the horizontal plane. After the pedal member 203 is flipped upward, it is more convenient for passengers to get on and off the vehicle. Of course, the pedal member 203 and the front frame 202 can also be fixedly connected. In this case, the pedal member 203 cannot be flipped up and down relative to the front frame 202.

[0068] Alternatively, if Fig.11 As shown, the front wheel frame assembly 200 may further include a front support wheel 204, which is connected to the pedal member 203. More specifically, the front support wheel 204 may be connected near the front end of the pedal member 203. Figure 3 As shown, in the unfolded state, the front support wheel 204 is suspended from the ground, and the suspension distance can be flexibly designed according to needs, for example, 4 cm. Figure 5 As shown, in the folded state, the front support wheels 204 are in contact with the ground and support the movement of the mobile device 100, and the front wheels 205 are suspended from the ground. With this design, the mobile device 100 can be moved effortlessly by relying on the rolling of the front support wheels 204 after being folded.

[0069] Alternatively, if Fig.12As shown, the rear wheel frame assembly 300 may further include a rear anti-dumping member 304. In the deployed state, the rear end of the rear anti-dumping member 304 is further back than the rear wheel 303, and the rear anti-dumping member 304 is suspended from the ground. There are various ways to achieve the suspension of the rear anti-dumping member 304 from the ground. For example, the front end of the rear anti-dumping member 304 may be fixed to the axle of the rear wheel 303. For another example, a transverse axis roughly parallel to the axle of the rear wheel 303 may be provided at the lower part of the rear frame 302, and the transverse axis is suspended from the ground, and the front end of the rear anti-dumping member 304 is fixed to the middle area of ​​the transverse axis. The rear anti-dumping member 304 is provided, and when an obstacle (such as Fig.12 When the pedestrian assisting person steps on the rear anti-tipping member 304 to tilt the front of the mobile device upward, the mobile device can pass through the obstacle conveniently and labor-savingly. In addition, the rear anti-tipping member 304 can also prevent the mobile device from tipping backward.

[0070] Alternatively, if Fig.12 As shown, the rear wheel frame assembly 300 may further include a rear support wheel 305, and the rear support wheel 305 is connected to the rear anti-dumping member 304. Figure 3 As shown, in the unfolded state, the rear support wheel 305 is suspended from the ground. Figure 5 As shown, in the folded state, the rear support wheel 305 is in contact with the ground and supports the electric mobile device 100 to move, and the rear wheel 303 is suspended from the ground. With this design, the mobile device 100 can be moved effortlessly by relying on the rolling of the rear support wheel 305 after being folded. More specifically, the rear support wheel 305 can be connected to the rear end of the rear anti-dumping member 304, so that when a pedestrian steps on the rear anti-dumping member 304 to tilt the front of the mobile device upward and the rear support wheel 305 is in contact with the ground, the obstacle can be passed effortlessly by relying on the rolling of the rear support wheel 305.

[0071] Specifically, the mobile device 100 also includes a limiting mechanism 800 and a releasing mechanism 900. The limiting mechanism 800 can limit the relative positions of the front wheel frame assembly 200 and the rear wheel frame assembly 300 in the unfolded state and the folded state, and the releasing mechanism 900 can release the position limitation of the front wheel frame assembly 200 and the rear wheel frame assembly 300 by the limiting mechanism 800.

[0072] More specifically, Fig.13 or Fig.14As shown, the limiting mechanism 800 includes a first limiting member 801, a limiting pin 802 and a first elastic reset member 803. The first limiting member 801 and the limiting pin 802, one of which is connected to the front wheel frame assembly 200, and the other is connected to the rear wheel frame assembly 300. The positions of the first limiting member 801 and the limiting pin 802 can be swapped. In the figure, the limiting pin 802 is connected to the rear wheel frame assembly 300. The first limiting member 801 is provided with a folding limiting groove 8011 and an unfolding limiting groove 8012 adapted to the limiting pin 802. The first limiting member 801 can be specifically a plate-like structure, and the folding limiting groove 8011 and the unfolding limiting groove 8012 are arranged at the edge of the plate-like structure, so that the edge of the plate-like structure is serrated.

[0073] like Fig.13 As shown, in the unfolded state, the unfolding limit groove 8012 is directly opposite to the limit pin 802, and the limit pin 802 is inserted into the unfolding limit groove 8012. Fig.14 As shown, in the folded state, the folding limit groove 8011 is directly opposite to the limit pin 802, and the limit pin 802 is inserted into the folding limit groove 8011. The limit pin 802 and the first limit member 801 can be relatively separated under the action of external force, so that the limit pin 802 can be disengaged from the folding limit groove 8011 or the unfolding limit groove 8012. The first elastic reset member 803 is located at one end of the limit pin 802 away from the first limit member 801, and the first elastic reset member 803 can be a spring or an elastic rubber pad. The limit pin 802 and the first limit member 801 can be relatively close to each other under the action of the elastic force of the first elastic reset member 803, so that the limit pin 802 is reset and inserted into the folding limit groove 8011 or the unfolding limit groove 8012.

[0074] like Fig.13 As shown, the first limiting member 801 is further provided with a stopper 8013. In addition, a second limiting member 804 is further provided, and the limiting pin 802 is inserted into the pin groove on the second limiting member 804, and the connection with the rear wheel frame assembly 300 is achieved through the second limiting member 804. In the unfolded state, the stopper 8013 and the second limiting member 804 stop each other, thereby further playing a limiting role.

[0075] The limiting mechanism of the above structure is simple in structure, has high limiting reliability, and is connected to the front wheel frame assembly 200 and the rear wheel frame assembly 300 without scattered parts. Of course, the structure of the limiting mechanism is not limited to this, and in theory, any structure can be used as long as it can limit the relative position of the front wheel frame assembly 200 and the rear wheel frame assembly 300. For example, two limiting holes can be respectively provided on the front wheel frame assembly 200 and the rear wheel frame assembly 300, and limiting pins adapted to the limiting holes can also be provided. In the folded state, one limiting hole of the front wheel frame assembly 200 is aligned with one limiting hole on the rear wheel frame assembly 300, and the limiting pin is inserted into the aligned limiting holes, thereby limiting the front wheel frame assembly 200 and the rear wheel frame assembly 300 in the folded state. In the unfolded state, another limiting hole of the front wheel frame assembly 200 is aligned with another limiting hole on the rear wheel frame assembly 300, and the limiting pin is inserted into the aligned limiting holes, thereby limiting the front wheel frame assembly 200 and the rear wheel frame assembly 300 in the unfolded state.

[0076] More specifically, Fig.15 As shown, the release mechanism 900 includes a release pedal 901 and a release transmission member 902. The release pedal 901 is rotatably connected to the front wheel frame assembly 200 or the rear wheel frame assembly 300. If the limit pin 802 is connected to the front wheel frame assembly 200, the release pedal 901 is connected to the front wheel frame assembly 200. If the limit pin 802 is connected to the rear wheel frame assembly 300, the release pedal 901 is connected to the rear wheel frame assembly 300. The release pedal 901 connected to the rear wheel frame assembly 300 is more convenient to operate. The release pedal 901 is connected to the limit pin 802 through the release transmission member 902, so that the limit pin 802 can be disengaged from the folding limit groove 8011 or the unfolding limit groove 8012 by rotating the release pedal 901. Specifically, the release transmission member 902 may be a flexible transmission member or a rigid transmission member, for example, a rope, one end of which is connected to one end of the limit pin 802 close to the first elastic reset member 803, and the other end of which is connected to the release pedal 901. Fig.15 In the limit state, the release pedal 901 is approximately in a horizontal state. When releasing the limit, the release pedal 901 is stepped down, and the release pedal 901 moves from Fig.15 The approximately horizontal position shown is rotated to Fig.16 The rear side is shown in a downward tilted state. The structure of the limit release mechanism is simple and easy to operate. Of course, the structure of the limit release mechanism is not limited to this. In theory, it is sufficient to release the position limit of the front wheel frame assembly 200 and the rear wheel frame assembly 300 by the limit mechanism 800.

[0077] Optionally, the backrest bracket 500 may be rotatably connected to a handle 600, and the handle 600 may be horizontally rotatable relative to the backrest bracket 500. In addition, the mobile device includes a locking and unlocking mechanism 1000, which can lock the handle 600 in the forward position ( Fig.17 shown position) or rearward position ( Fig.18 shown) or inwards ( Fig.19 As shown in the position), the locking and unlocking mechanism 1000 can also release the position lock of the handle 600.

[0078] When the mobile device is in riding mode, the handle 600 is rotated to the inward position to reduce riding resistance. When the mobile device is in power-assisted pushing mode, the handle 600 is rotated to the backward position, and the power-assisted pusher is located behind the mobile device and pushes the mobile device by holding the handle. When the mobile device is in rehabilitation walking mode, the handle 600 is rotated to the forward position, and the rehabilitation person is located in front of the mobile device and pushes the mobile device by holding the handle.

[0079] Alternatively, if Figure 17-Figure 19 As shown, the handle 600 may be provided with a control component 601, a force sensor (not visible in the figure) and a position sensor (not visible in the figure). The control component 601 may be a button, a knob, a touch key, etc. The force sensor is used to detect the force exerted by the user on the handle 600, and the position sensor is used to detect the position of the handle 600. The force sensor and the position sensor may be provided on the surface of the handle 601 or inside the handle 601. In addition, the mobile device includes a controller module 1300 (see Figure 1 ) and the motor. The controller module 1300 is connected to the control component 601, the force sensor and the position sensor in communication, and is configured as follows: when the controller module 1300 determines that the handle 600 is located in the forward or backward position according to the signal fed back by the position sensor, the controller module 1300 turns on the control function of the control component 601 so that the user's control instruction can be fed back to the controller module 1300 through the control component 601. After receiving the user's instruction fed back by the control component, the controller module 1300 turns off the brake function of the motor and controls the motor to assist in driving the mobile device according to the signal fed back by the force sensor; when the controller module 1300 determines that the handle is located in the inward position according to the signal fed back by the position sensor, the controller module 1300 turns off the control function of the control component 601 so that the user's control instruction cannot be fed back to the controller module 1300 through the control component 601. This design realizes the linkage control of different modes of the mobile device and different positions of the handle. When the mobile device is in the power-assisted pushing mode and the rehabilitation walking-assisting mode, the motor can provide a suitable amount of power according to the force applied by the user on the handle 600, so that the power-assisted pushing mode and the rehabilitation walking-assisting mode have a suitable speed and are relatively labor-saving.

[0080] Specifically, Fig. 20 As shown, the locking and unlocking mechanism 1000 includes a coaxially arranged locking tooth block 1001, a locking tooth sleeve 1002 and a second elastic reset member 1003. The locking tooth block 1001 and the locking tooth sleeve 1002 are connected to the handle 600 and the backrest bracket 500, respectively. The positions of the locking tooth block 1001 and the locking tooth sleeve 1002 can be swapped. In the figure, the locking tooth block 1001 is connected to the handle 600.

[0081] like Fig.21 As shown, when the handle 600 is in the forward, backward and inward positions, the teeth of the locking tooth block 1001 and the inter-tooth grooves of the locking tooth sleeve 1002 are opposite, and the teeth of the locking tooth block 1001 are inserted into the inter-tooth grooves of the locking tooth sleeve 1002. When the handle 600 is in other positions (except the forward, backward and inward positions), the teeth of the locking tooth block 1001 and the teeth of the locking tooth sleeve 1002 are opposite, and the teeth of the locking tooth block 1001 cannot be inserted into the inter-tooth grooves of the locking tooth sleeve 1002.

[0082] The locking tooth block 1001 and the locking tooth sleeve 1002 can be relatively far away from each other under the action of external force to achieve mutual separation. The locking tooth block 1001 and the locking tooth sleeve 1002 can be relatively close to each other under the elastic force of the second elastic reset member 1003 to achieve mutual engagement. In the figure, specifically, the locking tooth sleeve 1002 is located below the locking tooth block 1001, and the locking tooth sleeve 1002 can move up and down. The second elastic reset member 1003 is located below the locking tooth sleeve 1002. The locking tooth sleeve 1002 is operated to move downward to achieve separation from the locking tooth block 1001. As the locking tooth sleeve 1002 moves downward, the second elastic reset member 1003 is compressed. After the locking tooth sleeve 1002 is released, the locking tooth sleeve 1002 is reset upward under the elastic force of the second elastic reset member 1003.

[0083] This locking and unlocking mechanism 1000 has a simple structure, reliable locking, and easy operation. Of course, the structure of the locking and unlocking mechanism 1000 is not limited to this, as long as the handle 600 can be locked in the forward position, the rearward position, and the inward position and the position lock of the handle 600 can be released.

[0084] More specifically, Fig. 22 As shown, one tooth of the locking tooth block 1001 close to one end (lower end in the figure) of the locking tooth sleeve 1002 exceeds the remaining teeth of the locking tooth block 1001 to become an extended tooth A. Fig.23As shown, one tooth of the locking tooth sleeve 1002 is close to one end (the upper end in the figure) of the locking tooth block 1001 and exceeds the remaining teeth of the locking tooth block 1001 to become an extended tooth A. The extended tooth A of the locking tooth block 1001 is rotated 270° relative to the locking tooth sleeve 1002 from a position where it conflicts with one side of the extended tooth A of the locking tooth sleeve 1002, and conflicts with the other side of the extended tooth A of the locking tooth sleeve 1002. In this way, the handle 600 can be limited to rotate within a range of 270°, and the handle 600 can be prevented from rotating beyond the limit.

[0085] Specifically, Fig.24 As shown, a seat cushion 1100 is arranged above the seat support 201. In the unfolded state, the rear side of the seat cushion 1100 is tilted downward relative to the front side, so that the seat cushion 1100 has a preset angle with the horizontal plane. In some embodiments, the angle can be 7°~10°, for example, it can be 8°. The area where the seat cushion 1100 contacts the sciatic bone of the passenger is a plane, and the area where the seat cushion 1100 contacts the inner thigh of the passenger is a slightly concave arc surface. In this way, most of the body weight is concentrated on the ischial tuberosity, achieving the best body pressure distribution and reducing buttocks fatigue. In some embodiments, the height difference between the seat cushion 1100 and the pedal member 203 can be 350mm~400mm, for example, it can be 380mm.

[0086] like Fig.24 As shown, a backrest 1200 is provided on the front side of the backrest bracket 500. In the unfolded state, the upper side of the backrest 1200 is tilted backward relative to the lower side, so that there is a preset angle between the backrest 1200 and the vertical plane. In some embodiments, the angle can be 103°~107°, for example, it can be 105°, which is a relatively comfortable angle for sedentary people.

[0087] like Fig.24 As shown, the backrest 1200 is in a curved shape with a convex middle portion in the vertical direction (indicated by C in the figure). Fig.25 As shown, the backrest 1200 is in a horizontal direction in the shape of a curve with a concave middle portion (indicated by D in the figure). This hyperbolic design allows the entire body to be in a highly relaxed state when a person sits on it.

[0088] like Figure 1 and Figure 2As shown, the mobile device can also be equipped with a battery module 1400 to power the motor, the controller module 1300, etc. The mobile device can also be equipped with a hook 1500 to conveniently hook personal items. The hook 1500 can be set at a position convenient for the user to take, for example, set on the outside of the armrest bracket 3011. The mobile device can also be equipped with a hand rest 1600, which is located in front of the armrest 3012 to support the user's hand. In the figure, the hand rest 1600 is fixed to the upper end of the rear frame 302. The hand rest 1600 can be integrated with the central control module 400, and the central control module 400 includes a central control handle 401. The user can control the moving speed, moving direction, etc. of the mobile device by manipulating the central control handle 401.

[0089] Folding method of foldable mobile device provided in embodiment 1

[0090] The folding method comprises: operating any one or more of the front wheel frame assembly 200 , the rear wheel frame assembly 300 , the backrest bracket 500 and the connecting member 700 to rotate to realize the folding of the foldable mobile device.

[0091] More specifically, when "in the unfolded state, the first rotation connection O1 and the third rotation connection O3 are located in front of the second rotation connection O2 and the fourth rotation connection O4. The third rotation connection O3 and the fourth rotation connection O4 are located above the first rotation connection O1 and the second rotation connection O2. The distance between the first rotation connection O1 and the third rotation connection O3 is L1. The distance between the third rotation connection O3 and the fourth rotation connection O4 is L2. The distance between the second rotation connection O2 and the fourth rotation connection O4 is L3. The distance between the first rotation connection O1 and the second rotation connection O2 is L4. L1, L 2 is less than the sum of L3 and L4, during the folding process, the backrest bracket 500 first rotates backward, and after rotating to the collinearity of the first rotation connection and the fourth rotation connection, the backrest bracket 500 changes direction and rotates forward to approach the seat bracket 201. During the backward rotation of the backrest bracket 500, the rear side of the seat bracket 201 moves up and the front side moves down, and the lower end of the front wheel frame assembly 200 and the lower end of the rear wheel frame assembly 300 approach each other. During the forward rotation of the backrest bracket 500, the rear side of the seat bracket 201 further moves up and the front side further moves down, and the lower end of the front wheel frame assembly 200 and the lower end of the rear wheel frame assembly 300 further approach each other. Embodiment 2

[0092] like Figure 26-Figure 31 As shown, in this embodiment, the mobile device 100 is a portable foldable electric mobile device, and the mobile device 100 includes a front wheel frame assembly 200 and a rear wheel frame assembly 300. The front wheel frame assembly 200 and the rear wheel frame assembly 300 are roughly X-shaped, forming the main frame of the electric mobile device 100.

[0093] Furthermore, if Fig. 27 As shown, the front wheel frame assembly 200 includes a seat support 201, and the seat support 201 is used for a passenger to sit on in a use state.

[0094] Furthermore, the rear wheel frame assembly 300 includes an armrest assembly 301 , and the armrest assembly 301 is used for supporting the hands of the passenger in use and providing corresponding control buttons for controlling the movement of the mobile device 100 .

[0095] Furthermore, the front wheel frame assembly 200 is rotatably connected to the rear wheel frame assembly 300 via the rotating shaft E, and the front wheel frame assembly 200 and the rear wheel frame assembly 300 realize relative rotational movement via the rotating shaft E, such as rotating together or rotating to unfold, so that the mobile device 100 can be folded to reduce the volume of the mobile device 100 for storage.

[0096] Furthermore, the mobile device 100 also includes a backrest bracket 500, which is rotatably connected to the seat bracket 201 of the front wheel frame assembly 200. One specific implementation is that the backrest bracket 500 is hinged to the seat bracket 201 to achieve relative rotational movement.

[0097] The backrest bracket 500 is used for the passenger to lean back in the use state, so that the passenger can sit in the mobile device 100 more comfortably.

[0098] Furthermore, the mobile device also includes a connecting member 700, which is a folding connecting rod, one end of the folding connecting rod is rotatably connected to the armrest bracket 3011 of the armrest assembly 301, and a specific implementation method thereof is that one end of the folding connecting rod is hinged to the armrest bracket 3011 of the armrest assembly 301, so that one end of the folding connecting rod and the armrest bracket 3011 of the armrest assembly 301 can rotate relative to each other; the other end of the folding connecting rod is rotatably connected to the backrest bracket 500, and a specific implementation method thereof is that the other end of the folding connecting rod is hinged to the backrest bracket 500, so that the other end of the folding connecting rod and the backrest bracket 500 can rotate relative to each other.

[0099] The front wheel frame assembly 200, the rear wheel frame assembly 300, the backrest bracket 500 and the folding link form a quadrilateral linkage mechanism through the rotating shaft E and the hinged structures between each other, wherein the front wheel frame assembly 200 is equivalent to the bottom side of the quadrilateral linkage mechanism, the rear wheel frame assembly 300 is equivalent to the left side of the quadrilateral linkage mechanism, the backrest bracket 500 is equivalent to the right side of the quadrilateral linkage mechanism, and the folding link is equivalent to the top side of the quadrilateral linkage mechanism.

[0100] The quadrilateral linkage mechanism can realize mutual rotation changes, and the rotational movement of one side can drive the corresponding rotational movement of other sides. Specifically, Figure 28-Figure 29 As shown, the backrest bracket 500 can swing relatively forward and backward in the direction of the seat bracket 201. For example, when the backrest bracket 500 swings toward the rear of the seat bracket 201, the backrest bracket 500 rotates around the hinge point between the backrest bracket 500 and the seat bracket 201, and drives the armrest assembly 301 to rotate in the direction of the backrest bracket 500 through the folding connecting rod, so that the armrest assembly 301 is close to the backrest bracket 500 and the seat bracket 201. When the backrest bracket 500 swings to a certain distance behind the seat bracket 201, that is, the backrest bracket 500 rotates backward by a certain angle, at this time, the armrest assembly 301 and the backrest bracket 500 is roughly in parallel state, that is, in the quadrilateral linkage mechanism, the angle formed by the top side of the quadrilateral linkage mechanism composed of the folding links and the right side of the quadrilateral linkage mechanism composed of the backrest bracket 500 becomes very small, and correspondingly, the angle formed by the left side of the quadrilateral linkage mechanism composed of the armrest assembly 301 and the bottom side of the quadrilateral linkage mechanism composed of the seat bracket 201 also becomes very small; then the backrest bracket 500 rotates toward the direction of the seat bracket 201 with the hinge point of the backrest bracket 500 and the seat bracket 201 as the center until it is close to the seat bracket 201, thereby realizing the overall folding of the mobile device 100 and becoming a folded state.

[0101] Furthermore, the front wheel frame assembly 200 also includes a front frame 201, and the rear wheel frame assembly 300 also includes a rear frame 302. The front frame 201 is rigidly connected to the seat support 201, and the rear frame 302 is rigidly connected to the armrest assembly 301. The front frame 201 and the rear frame 302 are rotatably connected via the rotating shaft E, so that the movement of the seat support 201 can directly drive the movement of the front frame 202, and the movement of the armrest assembly 301 can directly drive the movement of the rear frame 302, so that the front frame 202 and the rear frame 302 perform relative rotational movement around the rotating shaft E, so as to realize the relative folding and approaching, and relative unfolding and separation of the front frame 202 and the rear frame 302.

[0102] Furthermore, the front wheel frame assembly 200 further includes a pedal member 203, and the pedal member 203 is used to provide support for the feet of the passenger of the mobile device 100 in the use state.

[0103] Furthermore, the pedal member 203 is rigidly connected to the front frame 202, so that the pedal member 203 can rotate along with the rotation of the front frame 202, and then in the folded state of the mobile device 100, the pedal member 203 folds toward the rear frame 302 along with the front frame 202.

[0104] Furthermore, the front frame 202 is rigidly connected to the front wheel 205, and the rear frame 302 is rigidly connected to the rear wheel 303. The front wheel 205 is a universal wheel for adjusting the driving direction of the mobile device 100, and the rear wheel 303 is used to provide driving force. The front wheel 205 and the rear wheel 303 jointly support the mobile device 100 so that the mobile device 100 can travel in the use state.

[0105] like Figure 30-Figure 31 As shown, when the mobile device 100 is in the folded state, the front wheels 205 and the rear wheels 303 are close to each other and suspended from the ground. The distance between the front wheels 205 and the rear wheels 303 and the ground is less than 10 cm. Preferably, the distance between the front wheels 205 and the rear wheels 303 and the ground is less than 1 cm.

[0106] Furthermore, the pedal member 203 further includes a front support wheel 204 , and the front support wheel 204 is located below the pedal member 203 .

[0107] When the mobile device 100 is in use, the front support wheels 204 are suspended from the ground, and the mobile device 100 is supported by the front wheels 205 and the rear wheels 303 . The front support wheels 204 are less than 10 cm from the ground, and preferably, less than 3 cm from the ground.

[0108] When the mobile device 100 is in the folded state, the front support wheel 204 is in contact with the ground as the pedal member 203 is folded, and supports the movement of the mobile device 100. At this time, the front wheel 205 and the rear wheel 303 are suspended from the ground and do not participate in the support and movement of the mobile device 100.

[0109] Furthermore, the rear wheel 303 is also connected to a rear anti-dumping member 304, which is used to support the mobile device 100 when an emergency occurs and causes the mobile device 100 to tip over backwards. Therefore, in the use state, the rear anti-dumping member 304 is configured to be closer to the rear of the mobile device 100 than the rear wheel 303.

[0110] A rear support wheel 305 is disposed at the rear end of the rear anti-dumping member 304 . When an emergency occurs and causes the mobile device 100 to dump backward, the rear support wheel 305 can promptly support the mobile device 100 from further dumping.

[0111] In the use state, the rear support wheel 305 is suspended from the ground, and the distance between the rear support wheel 305 and the ground is less than 10 cm. Preferably, the distance between the rear support wheel 305 and the ground is less than 3 cm.

[0112] In the folded state, the rear support wheels 305 are in contact with the ground and support the movement of the mobile device 100 .

[0113] Furthermore, a first limiting mechanism (not shown in the drawings) is provided between the front wheel frame assembly 200 and the rear wheel frame assembly 300, and the first limiting mechanism is used to limit the distance between the front wheel 205 and the rear wheel 303 in the use state, so that the distance between the front wheel 205 and the rear wheel 303 of the mobile device 100 will not be suddenly shortened in the use state, thereby causing the mobile device 100 to suddenly fold.

[0114] When the mobile device 100 needs to be folded, the first limiting mechanism needs to be released first, so that the front wheels 205 and the rear wheels 303 can be brought together normally.

[0115] Furthermore, a second limiting mechanism (not shown in the drawings) is provided between the front wheel frame assembly 200 and the rear wheel frame assembly 300, and the second limiting mechanism is used to limit the distance between the front wheel 205 and the rear wheel 303 in the folded state, so that the distance between the front wheel 205 and the rear wheel 303 of the mobile device 100 will not suddenly increase in the folded state, thereby causing the mobile device 100 to suddenly unfold.

[0116] When the mobile device 100 needs to be unfolded to the use state, the second limiting mechanism needs to be released first, so that the front wheels 205 and the rear wheels 303 can be separated normally.

[0117] Furthermore, the backrest bracket 500 further includes a handle 600, which is located at the upper end of the backrest bracket 500 and is used for the user to hold the handle 600 to push the mobile device 100 when the mobile device 100 is in use. At the same time, the handle 600 also provides an operation point for the user when the mobile device 100 needs to be folded. The user only needs to hold the handle 600 and flip the handle 600 backwards to start folding the mobile device 100, so that the backrest bracket 500 can be flipped backwards and then folded toward the seat bracket 201, thereby completing the folding of the entire vehicle.

[0118] Since the handle 600 is located at the upper end of the backrest bracket 500, that is, located on the extension line of one side of the backrest bracket 500 of the quadrilateral linkage mechanism, the force arm is longer when operating on the handle 600, and the extension line constitutes a labor-saving lever, which saves the user more effort when performing folding operations. In addition, since the handle 600 is located at the uppermost end of the mobile device 100 and is relatively high, the user does not need to bend down when operating on the handle 600 to complete the folding operation, which is convenient for users, especially elderly users, and provides a better user experience.

[0119] This embodiment has the following advantages:

[0120] The front wheel frame assembly, the rear wheel frame assembly and the backrest bracket are rotatably connected to each other through the folding connecting rod to form a quadrilateral connecting rod structure. By utilizing the movement characteristics of the quadrilateral, any side of the quadrilateral can be flipped, and the other three sides can be folded synchronously to realize the folding of the whole vehicle.

[0121] The operation point of the vehicle folding is located at the backrest position. The operating height of the backrest is higher. When folding and restoring the electric wheelchair, it is more ergonomically friendly to the user, with better force and less bending, which is especially more friendly to elderly users.

[0122] The folding operation point is on the handle, and the handle is located on the extension line of one side of the backrest bracket of the quadrilateral connecting rod structure. The operating force arm is long, which plays the effect of a labor-saving lever.

[0123] A folding method for a mobile device provided in Embodiment 2

[0124] The folding method specifically comprises the following steps:

[0125] S100: The backrest bracket 500 is rotated backward, preferably, the handle 600 at the upper end of the backrest bracket 500 is rotated backward, and the angle between the backrest bracket 500 and the folding link begins to decrease until the folding link and the backrest bracket 500 are roughly parallel. At this time, the front frame 202 rotates around the rotation axis E and approaches the rear frame 302. The front wheel 205 is driven by the front frame 202, and the rear wheel 303 is driven by the rear frame 302, so that the front wheel 205 approaches the rear wheel 303;

[0126] S200: Rotate the backrest bracket 500 toward the seat bracket 201 until the backrest bracket 500 and the seat bracket 201 are brought close to each other. At this time, the front frame 202 is further brought close to the rear frame 302 until the front wheel 205 and the rear wheel 303 are brought close to each other.

[0127] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A foldable mobile device, characterized in that: The foldable mobile device comprises: A front wheel frame assembly, the front wheel frame assembly comprising a seat support, the seat support being used for a passenger to sit on in an unfolded state; A rear wheel frame assembly, wherein the rear wheel frame assembly is rotatably connected to the front wheel frame assembly, and the rotation connection is a first rotation connection; A backrest bracket, the backrest bracket is rotatably connected to the seat bracket and can swing forward and backward relative to the seat bracket, the rotation connection is a second rotation connection, and the backrest bracket is used for the passenger to lean on in the unfolded state; A connecting member, wherein the connecting member is rotatably connected to the rear wheel frame assembly, and the rotational connection is a third rotational connection. The connecting member is also rotatably connected to the backrest bracket, and the rotational connection is a fourth rotational connection. In the unfolded state, the first rotation connection, the second rotation connection, the third rotation connection and the fourth rotation connection are distributed in a quadrilateral, so that the front wheel frame assembly, the rear wheel frame assembly, the backrest bracket and the connecting member form a four-bar linkage.

2. The foldable mobile device according to claim 1, characterized in that: The front wheel frame assembly further comprises a front frame and a front wheel, wherein the front frame is rigidly connected to the seat support, the front wheel is connected to the front frame, and the front wheel is used to contact the ground in an unfolded state; The rear wheel frame assembly includes a rear frame and a rear wheel. The rear frame is rotatably connected to the front frame, and the rotation connection is the first rotation connection. The rear wheel is connected to the rear frame, and the rear wheel is used to contact the ground in an unfolded state.

3. The foldable mobile device according to claim 2, wherein: In the unfolded state, the first rotation connection and the third rotation connection are located in front of the second rotation connection and the fourth rotation connection, the third rotation connection and the fourth rotation connection are located above the first rotation connection and the second rotation connection, and the sum of the distance L1 between the first rotation connection and the third rotation connection and the distance L2 between the third rotation connection and the fourth rotation connection is smaller than the sum of the distance L3 between the second rotation connection and the fourth rotation connection and the distance L4 between the first rotation connection and the second rotation connection.

4. The foldable mobile device according to claim 2, characterized in that: The rear wheel frame assembly also includes an armrest assembly, which includes an armrest bracket and an armrest, the armrest bracket is rigidly connected to the rear frame, the armrest is slidably connected to the armrest bracket and can slide forward and backward relative to the armrest bracket, and the armrest is respectively provided with a stopper at the front and rear, and the stopper is used to limit the forward and backward sliding limit of the armrest.

5. The foldable mobile device according to claim 4, characterized in that: The armrest and the armrest bracket are provided with a positioning portion on one side and a plurality of positioning grooves on the other side arranged in sequence and at intervals along the front-to-back direction. When the armrest slides until the positioning portion is directly opposite to the positioning groove, the positioning portion can automatically enter the positioning groove to position the armrest.

6. The foldable mobile device according to claim 5, characterized in that: The positioning portion includes a ball and a ball spring, one end of the ball spring is installed in a mounting groove on the armrest or the armrest bracket, and the ball is arranged at the other end of the ball spring. When the armrest slides until the positioning portion is opposite to the positioning groove, the ball can automatically enter the positioning groove under the action of the elastic force of the ball spring to achieve armrest positioning.

7. The foldable mobile device according to claim 2, characterized in that: The front wheel frame assembly also includes a pedal member, which is used to support the feet of the passenger in an unfolded state. The pedal member is fixedly connected to the front frame, or the pedal member is rotatably connected to the front frame and can be turned up and down relative to the front frame.

8. The foldable mobile device according to claim 7, characterized in that: The front wheel frame assembly also includes a front support wheel, which is connected to the pedal member; in the unfolded state, the front support wheel is suspended from the ground; in the folded state, the front support wheel is in contact with the ground and supports the movement of the mobile device, and the front wheel is suspended from the ground.

9. The foldable mobile device according to claim 2, characterized in that: The rear wheel frame assembly further comprises a rear anti-dumping member; in an unfolded state, a rear end of the rear anti-dumping member is further rearward than the rear wheel, and the rear anti-dumping member is suspended from the ground.

10. The foldable mobile device according to claim 9, characterized in that: The rear wheel frame assembly also includes a rear support wheel, which is connected to the rear anti-dumping member; in an unfolded state, the rear support wheel is suspended from the ground; in a folded state, the rear support wheel is in contact with the ground and supports the electric mobile device to move, and the rear wheel is suspended from the ground.

11. The foldable mobile device according to any one of claims 1 to 10, characterized in that: The mobile device includes a limiting mechanism and a releasing mechanism, wherein the limiting mechanism can limit the relative positions of the front wheel frame assembly and the rear wheel frame assembly in an unfolded state and a folded state, and the releasing mechanism can release the position limitation of the front wheel frame assembly and the rear wheel frame assembly imposed by the limiting mechanism.

12. The foldable mobile device according to claim 11, characterized in that: The limiting mechanism includes a first limiting member, a limiting pin and a first elastic return member, wherein the first limiting member and the limiting pin are connected to the front wheel frame assembly at one and connected to the rear wheel frame assembly at the other, the first limiting member is provided with a folding limiting groove and an unfolding limiting groove adapted to the limiting pin, in an unfolded state, the unfolding limiting groove is opposite to the limiting pin, and in a folded state, the folding limiting groove is opposite to the limiting pin, the limiting pin and the first limiting member can be relatively separated from each other under the action of an external force so that the limiting pin can be disengaged from the folding limiting groove or the unfolding limiting groove, and the limiting pin and the first limiting member can be relatively close to each other under the action of the elastic force of the first elastic return member so that the limiting pin can be inserted into the folding limiting groove or the unfolding limiting groove.

13. The foldable mobile device according to claim 12, characterized in that: The release mechanism includes a release pedal and a release transmission member, the release pedal is rotatably connected to the front wheel frame assembly or the rear wheel frame assembly, and the release pedal is also connected to the limit pin through the release transmission member, so that the limit pin can be disengaged from the folding limit groove or the unfolding limit groove by rotating the release pedal.

14. The foldable mobile device according to any one of claims 1 to 10, characterized in that: The backrest bracket is rotatably connected to a handle, and the handle can rotate horizontally relative to the backrest bracket; The mobile device comprises a locking and unlocking mechanism, which can lock the handle in a forward position, a rearward position, and an inward position, and can also release the position lock of the handle.

15. The foldable mobile device according to claim 14, characterized in that: The locking and unlocking mechanism includes a coaxially arranged locking tooth block, a locking tooth sleeve and a second elastic return member, wherein one of the locking tooth block and the locking tooth sleeve is connected to the handle and the other is connected to the backrest bracket, and when the handle is located in the forward position, the rearward position and the inward position, the teeth of the locking tooth block and the inter-tooth grooves of the locking tooth sleeve are directly opposite, and when the handle is located in other positions, the teeth of the locking tooth block and the teeth of the locking tooth sleeve are opposite, and the locking tooth block and the locking tooth sleeve can be relatively moved away from each other under the action of an external force to achieve mutual separation, and the locking tooth block and the locking tooth sleeve can be relatively approached under the action of the elastic force of the second elastic return member to achieve mutual engagement.

16. The foldable mobile device according to claim 15, characterized in that: One tooth of the locking tooth block is close to one end of the locking tooth sleeve and exceeds the other teeth of the locking tooth block to become an extended tooth. One tooth of the locking tooth sleeve is close to one end of the locking tooth block and exceeds the other teeth of the locking tooth block to become an extended tooth. The extended tooth of the locking tooth block is rotated 270° relative to the locking tooth sleeve from a position where it conflicts with one side of the extended tooth of the locking tooth sleeve and conflicts with the other side of the extended tooth of the locking tooth sleeve.

17. The foldable mobile device according to claim 16, characterized in that: The handle is provided with a control component, a force sensor and a position sensor, the force sensor is used to detect the force exerted by the user on the handle, and the position sensor is used to detect the position of the handle; The mobile device includes a controller module and a motor. The controller module is communicatively connected with the manipulation component, the force sensor, and the position sensor, and is configured as follows: When the controller module determines that the handle is located at the forward or backward position according to the signal fed back by the position sensor, the controller module turns on the control function of the control component so that the user's control instruction can be fed back to the controller module through the control component. After receiving the user's instruction fed back by the control component, the controller module turns off the brake function of the motor and controls the motor to assist in driving the mobile device according to the signal fed back by the force sensor. When the controller module determines that the handle is located at the inward position according to the signal fed back by the position sensor, the controller module turns off the control function of the control component so that the user's control instruction cannot be fed back to the controller module through the control component.

18. The foldable mobile device according to any one of claims 1 to 10, characterized in that: A seat cushion is arranged above the seat support. In the unfolded state, the rear side of the seat cushion is tilted downward relative to the front side, so that the seat cushion has a preset angle with the horizontal plane. The area where the seat cushion contacts the sciatic bone of the occupant is a plane, and the area where the seat cushion contacts the inner thigh of the occupant is a slightly concave arc surface.

19. The foldable mobile device according to any one of claims 1 to 10, characterized in that: A backrest is arranged on the front side of the backrest bracket. The backrest is in a curved shape with a concave middle portion in the horizontal direction and a convex middle portion in the vertical direction. In the unfolded state, the upper side of the backrest is tilted backward relative to the lower side, so that there is a preset angle between the backrest and the vertical plane.

20. The folding method of a foldable mobile device according to any one of claims 1 to 19, characterized in that: The foldable mobile device is folded by operating any one or more of the front wheel frame assembly, the rear wheel frame assembly, the backrest bracket and the connecting member to rotate.

21. The folding method of a foldable mobile device according to claim 20, characterized in that: During the folding process, the backrest bracket first rotates backward, and after rotating until the first rotation connection, the third rotation connection, and the fourth rotation connection are in line, the backrest bracket changes direction and rotates forward to approach the seat bracket; During the backward rotation of the backrest bracket, the rear side of the seat bracket moves upward and the front side moves downward, and the lower end of the front wheel frame assembly and the lower end of the rear wheel frame assembly approach each other; During the forward rotation of the backrest bracket, the rear side of the seat bracket further moves upward and the front side further moves downward, and the lower end of the front wheel frame assembly and the lower end of the rear wheel frame assembly further approach each other.

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