Portable folding scooter

Abstract

The utility model provides a portable folding scooter. The portable folding scooter comprises a front wheel assembly, a chassis frame, a rear wheel assembly, a seat assembly and a connecting rod assembly. The front wheel assembly has a front wheel crossbeam; in the chassis frame, the front chassis frame is hinged with the rear chassis frame; the rear wheel assembly is installed on the rear chassis frame. In the seat assembly, the two ends of a first supporting piece are hinged to a rear chassis frame and a seat plate respectively, the two ends of a second supporting piece are hinged to the rear chassis frame and the seat plate respectively, the upper ends of the first supporting piece and the second supporting piece are obliquely arranged in the direction facing the front wheel assembly, the two ends of a third supporting piece are hinged to a backrest and the second supporting piece respectively, and the seat plate is hinged to the backrest. In the connecting rod assembly, two ends of a first connecting rod are hinged to a front wheel beam and a second connecting rod respectively, two ends of the second connecting rod are hinged to a front chassis frame and a third connecting rod respectively, the third connecting rod is hinged to a rear chassis frame, and two ends of a fourth connecting rod are hinged to the third connecting rod and a first supporting piece respectively. The portable folding scooter is simple in structure and small in occupied space after being folded.

Description

Technical Field

[0001] The utility model relates to the technical field of scooters, in particular to a portable folding scooter. Background Art

[0002] A mobility scooter, also known as a lazy bike, is a vehicle or auxiliary tool used for transportation. It greatly facilitates people's travel. However, existing mobility scooters are either incapable of folding or have complex folding structures. The folding and unfolding process is time-consuming and labor-intensive, making them inconvenient to use and difficult to carry once folded. Therefore, the present application discloses a portable folding mobility scooter that can be folded and unfolded as a whole, has a simple folding structure, and has a uniform thickness after folding, making it easy to carry.

[0003] Chinese patent publication number CN116101413B discloses a folding scooter. Although it can realize the folding function, when folded, its seat plate and backrest overlap with the wheels, resulting in uneven thickness distribution of the folded part and a large space occupied after folding. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, the purpose of the present invention is to provide a portable foldable scooter with a simple structure and small space occupation after folding.

[0005] To achieve the above-mentioned purpose, the utility model proposes a portable folding scooter, which includes: a front wheel assembly, a chassis frame, a rear wheel assembly, a seat assembly and a connecting rod assembly;

[0006] The front wheel assembly has a front wheel cross beam, and the front wheel cross beam defines a first connecting portion and a second connecting portion;

[0007] The chassis frame comprises a front chassis frame and a rear chassis frame, the front chassis frame defines a third connecting portion, the rear chassis frame defines a fourth connecting portion, both ends of the front chassis frame are hingedly connected to the second connecting portion and the rear chassis frame in a one-to-one correspondence to construct an installation space, a limiting structure is provided between the rear chassis frame and the front chassis frame to limit the reverse folding of the two, and a seat cross beam of the rear chassis frame defines a fifth connecting portion and a sixth connecting portion;

[0008] The rear wheel assembly is mounted on the rear end of the rear chassis frame;

[0009] The seat assembly comprises a first support member, a second support member, a third support member, a seat plate and a backrest, the seat plate defining a seventh connection portion and an eighth connection portion, two ends of the first support member being hingedly connected to the sixth connection portion and the eighth connection portion in a one-to-one correspondence, two ends of the second support member being hingedly connected to the fifth connection portion and the seventh connection portion in a one-to-one correspondence, upper ends of the first support member and the second support member being inclined toward the front wheel assembly, two ends of the third support member being hingedly connected to the backrest and the second support member in a one-to-one correspondence, and the seat plate being hingedly connected to the backrest;

[0010] The connecting rod assembly has a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, the two ends of the first connecting rod are hinged to the first connecting part and the second connecting rod in a one-to-one correspondence, the two ends of the second connecting rod are hinged to the third connecting part and the third connecting rod in a one-to-one correspondence, the third connecting rod is hinged to the fourth connecting part, and the two ends of the fourth connecting rod are hinged to the third connecting rod and the first support member in a one-to-one correspondence.

[0011] According to an embodiment of the present invention, a portable foldable scooter is provided with a foldable front chassis frame and a rear chassis frame, a foldable front chassis frame and a front wheel assembly, a foldable rear chassis frame and a seat, and a connecting rod assembly to enable the front wheel assembly, the seat assembly and the chassis frame to be folded in a linked manner. When folded in a linked manner, the seat plate of the seat assembly moves toward the folding point of the front chassis frame and the rear chassis frame and avoids the rear wheel assembly, and the backrest of the seat assembly moves toward the rear wheel assembly, so that the thickness of the scooter is evenly distributed after being folded as a whole, and the space occupied is small.

[0012] In addition, the portable folding scooter according to the above embodiment of the present invention may also have the following additional technical features:

[0013] Optionally, the limiting structure includes a groove and a protrusion, and the protrusion can be embedded in the groove and abut against each other to limit the rear chassis frame and the front chassis frame from folding in reverse.

[0014] Furthermore, the groove is provided at the rear end of the front chassis frame, the protrusion is provided at the front end of the rear chassis frame, and the groove and the protrusion are hinged at the lower end.

[0015] Optionally, a handle assembly is further included, wherein the handle assembly has a limit rod, a handle and a locking member, the limit rod is mounted on the rear chassis frame, the limit rod can abut the second support member to limit the front chassis frame and the rear chassis frame from folding in reverse, the handle is swingably mounted on the limit rod, when the handle is pulled upward, the front chassis frame and the rear chassis frame fold in a folding direction, and the locking member is suitable for locking the handle in a horizontal state.

[0016] Optionally, the first connecting rod is configured to protrude upward to create a clearance space for avoiding the rear wheel assembly.

[0017] Optionally, the first support member defines a support portion, and the support portion is arranged adjacent to the hinge between the first support member and the seat plate to support the third support member.

[0018] Furthermore, the first support member is hollow, and the second support member is located in the hollow portion of the first support member.

[0019] Optionally, the front chassis is provided with a reinforcing crossbeam, the middle portion of which is recessed downward to form a storage space for accommodating the rudder bar of the front wheel assembly.

[0020] Optionally, the first connection portion, the third connection portion and the fourth connection portion are all extended into the installation space.

[0021] Optionally, an elastic buffer is further included, and the elastic buffer is arranged on the seat cross beam to elastically abut the second support member. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the internal structure of the portable foldable scooter in the unfolded state according to an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 A structural diagram from another perspective;

[0024] Figure 3 for Figure 1 A structural diagram from another perspective;

[0025] Figure 4 Schematic diagram of the external structure of a portable folding scooter according to an embodiment of the present utility model;

[0026] Figure 5 This is a structural diagram of a portable foldable scooter in a folded state according to an embodiment of the present utility model;

[0027] Description of reference numerals:

[0028] Front wheel assembly 1, front wheel cross beam 11, first connecting portion 111, second connecting portion 112, lighting lamp 12, swing bar 13, rudder stock 14, front wheel 15;

[0029] Chassis frame 2, front chassis frame 21, third connecting portion 211, groove 212, rear chassis frame 22, fourth connecting portion 221, seat cross member 222, fifth connecting portion 223, sixth connecting portion 224, protrusion 225, reinforcing cross member 226, storage space 227, elastic buffer member 228;

[0030] Rear wheel assembly 3, rear wheel 31, tugboat 32;

[0031] Seat assembly 4, first support member 41, support portion 411, second support member 42, third support member 43, seat plate 44, seventh connection portion 441, eighth connection portion 442, backrest 45;

[0032] Connecting rod assembly 5, first connecting rod 51, second connecting rod 52, third connecting rod 53, fourth connecting rod 54, and clearance space 55;

[0033] Handle assembly 6, limiting rod 61, handle 62, locking member 63;

[0034] First housing 7;

[0035] Second housing 8;

[0036] The third housing 9. DETAILED DESCRIPTION

[0037] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] To better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0039] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0040] Reference below Figure 1-Figure 5 , the implementation of the portable folding scooter proposed in accordance with an embodiment of the present utility model is described in detail.

[0041] The portable folding scooter according to the embodiment of the present invention comprises: a front wheel assembly 1 , a chassis frame 2 , a rear wheel assembly 3 , a seat assembly 4 and a connecting rod assembly 5 .

[0042] Specifically, the front wheel assembly 1 has a front wheel cross beam 11, which defines a first connection portion 111 and a second connection portion 112; the chassis frame 2 has a front chassis frame 21 and a rear chassis frame 22, the front chassis frame 21 defines a third connection portion 211, and the rear chassis frame 22 defines a fourth connection portion 221. The two ends of the front chassis frame 21 are hingedly connected to the second connection portion 112 and the rear chassis frame 22 in a one-to-one correspondence to construct an installation space. A limiting structure is provided between the rear chassis frame 22 and the front chassis frame 21 to limit the reverse folding of the two. The seat cross beam 222 of the rear chassis frame 22 defines a fifth connection portion 223 and a sixth connection portion 224; the rear wheel assembly 3 is installed at the rear end of the rear chassis frame 22; the seat assembly 4 has a first support member 41, a second support member 42, a third support member 43, a seat plate 44 and a backrest 45, and the seat plate 44 defines a seventh connection portion 441 and an eighth connection portion 44 2. The two ends of the first support member 41 are hinged to the sixth connection part 224 and the eighth connection part 442 in a one-to-one correspondence, and the two ends of the second support member 42 are hinged to the fifth connection part 223 and the seventh connection part 441 in a one-to-one correspondence. The upper ends of the first support member 41 and the second support member 42 are both inclined toward the direction of the front wheel assembly 1. The two ends of the third support member 43 are hinged to the backrest 45 and the second support member 42 in a one-to-one correspondence, and the seat plate 44 is hinged to the backrest 45; the connecting rod assembly 5 includes a first connecting rod 51, a second connecting rod 52, a third connecting rod 53 and a fourth connecting rod 54. The two ends of the first connecting rod are hinged to the first connecting part 111 and the second connecting rod 52 in a one-to-one correspondence, the two ends of the second connecting rod 52 are hinged to the third connecting part 211 and the third connecting rod 53 in a one-to-one correspondence, the third connecting rod 53 is hinged to the fourth connecting part 221, and the two ends of the fourth connecting rod 54 are hinged to the third connecting rod 53 and the first support member 41 in a one-to-one correspondence.

[0043] That is to say, the front chassis frame 21 is hinged to the front wheel cross beam 11 and the rear chassis frame 22, so that the front chassis frame 21 and the front wheel cross beam 11 form a first folding point at the first connection portion 111, a second folding point is formed at the hinge of the front chassis frame 21 and the rear chassis frame 22, a third folding point is formed at the hinge of the first support member 41, the second support member 42 and the seat cross beam 222, a fourth folding point is formed at the hinge of the first support member 41, the second support member 42 and the seat plate 44, and a fifth folding point is formed at the hinge of the seat plate 44 and the backrest 45. When the second folding point is folded, the first connecting rod 51 pulls the front wheel assembly 1 toward the rear wheel assembly 3, and the second connecting rod 52 drives the third connecting rod 53 to swing with the fourth connection portion 221 as the fulcrum. The third link 53 drives the fourth link 54 to push the first support member 41, and makes the first support member 41 swing toward the rear chassis frame 22 with the sixth connection portion 224 as the fulcrum, thereby driving the seat plate 44 to move toward the second folding position. In the process of moving toward the second folding position, the seat plate 44 drives the second support member 42 to move toward the second folding position. As a result, relative movement is formed between the first support member 41 and the second support member 42, so that the rear end of the seat plate 44 moves toward the seat cross beam 222. At the same time, the second support member 42 drives the third support member 43 to swing the backrest 45 at the hinge between the seat plate 44 and the backrest 45, so that the backrest 45 is folded toward the rear wheel 31. After folding, the seat plate 44 is staggered with the rear wheel 31, occupying less space.

[0044] Thus, the front chassis frame 21 and the rear chassis frame 22 of the chassis frame 2 are foldable, the front chassis frame 21 and the front wheel assembly 1 are foldable, and the rear chassis frame 22 and the seat are foldable. The front wheel assembly 1, the seat assembly 4 and the chassis frame 2 are linked and folded through the connecting rod assembly 5. During the linked folding, the seat plate 44 of the seat assembly 4 moves toward the folding position of the front chassis frame 21 and the rear chassis frame 22 and avoids the rear wheel assembly 3, and the backrest 45 of the seat assembly 4 moves toward the rear wheel assembly 3, so that the thickness of the overall mobility scooter is evenly distributed after folding, and the space occupied is small.

[0045] Optionally, the limiting structure includes a groove 212 and a protrusion 225. The protrusion 225 can be embedded in the groove 212 and abut against each other to limit the reverse folding of the rear chassis frame 22 and the front chassis frame 21. It can be understood that the mutual abutment between the protrusion 225 and the groove 212 facilitates the mutual restriction of the front chassis frame 21 and the rear chassis frame 22, so that the front chassis frame 21 and the rear chassis frame 22 can only fold in one direction. At the same time, the concave-convex fit can ensure the coaxiality of the front chassis frame 21 and the rear chassis frame 22, preventing them from swinging significantly in the lateral direction, thereby ensuring the strength of the front chassis frame 21 and the rear chassis frame 22 in the unfolded state.

[0046] Furthermore, the groove 212 is provided at the rear end of the front chassis frame 21, the protrusion 225 is provided at the front end of the rear chassis frame 22, and the groove 212 and the protrusion 225 are hinged at the lower end. It can be understood that by providing the groove 212 at the rear end of the front chassis frame 21, the protrusion 225 at the front end of the rear chassis frame 22, and the groove 212 and the protrusion 225 at the lower end, the swinging and folding functions and the limiting functions of the front chassis frame 21 and the rear chassis frame 22 are integrated at the ends of the two. This ensures that the connection strength of the front chassis frame 21 and the rear chassis frame 22 is guaranteed while occupying a small space in the unfolded state. In the folded state, the front chassis frame 21 and the rear chassis frame 22 can be closely attached to each other, allowing for more complete folding. Among them, the top of the protrusion 225 abuts against the bottom of the groove 212, and the tops of both sides of the groove 212 abut against the bottom of the protrusion 225. The cooperation of multiple abutting surfaces can improve the stability of the support and ensure the strength of the unfolded state.

[0047] Optionally, a handle assembly 6 is further included, which has a limit rod 61, a handle 62 and a locking member 63. The limit rod 61 is installed on the rear chassis frame 22, and the limit rod 61 can abut the second support member 42 to limit the reverse folding of the front chassis frame 21 and the rear chassis frame 22. The handle 62 is swingably installed on the limit rod 61. When the handle 62 is pulled upward, the front chassis frame 21 and the rear chassis frame 22 fold in the folding direction, and the locking member 63 is suitable for locking the handle 62 in a horizontal state. It can be understood that the limiting rod 61 is provided so as to abut against the upper surface of the second support member 42, thereby limiting the reverse folding of the front chassis frame 21 and the rear chassis frame 22, thereby further strengthening the support strength of the front chassis frame 21 and the rear chassis frame 22 in the unfolded state. The handle 62 is mounted on the limiting rod 61, which facilitates the user to pull the handle to fold the scooter. The locking member 63 can lock the handle 62 in a horizontal state to prevent the handle 62 from swinging during riding. In particular, one end of the limiting rod 61 can be inserted through one side of the rear chassis frame 22, and the other end of the limiting rod 61 can be inserted through the other side of the rear chassis frame 22, and then fixedly connected by screws or positioning pins. The handle 62 can be provided with a limiting groove, and the limiting rod 61 is provided with a limiting pin that cooperates with the limiting groove to facilitate limiting the swinging of the handle 62 within a range that is convenient for the user to pull. The handle 62 can be L-shaped.

[0048] Optionally, the first connecting rod 51 is configured to protrude upward to create a clearance space 55 for the rear wheel assembly 3. As will be appreciated, by protruding upward from the first connecting rod, the clearance space 55 is formed below the first connecting rod to allow the rear wheel assembly 3 to pass through. This allows the rear wheel assembly 3 to fit more closely against the front chassis frame 21 when the mobility scooter is folded, with the rear wheels 31 positioned above the front wheels 15, resulting in a smaller footprint after folding. The clearance space 55 can be trapezoidal in shape, positioned adjacent to the front wheels 15. The rear wheel assembly 3 can be equipped with a tug wheel 32 to facilitate dragging after folding.

[0049] Optionally, the first support member 41 defines a support portion 411, which is positioned adjacent to the hinged connection between the first support member 41 and the seat panel 44 to support the third support member 43. As can be appreciated, supporting the third support member 43 via the support portion 411 further supports the seat panel 44, thereby enhancing the stability of the seat panel 44. A reinforcing rib is provided at the bottom of the seat panel 44. The seventh and eighth connecting portions 441, 442 are positioned at the front end of the reinforcing rib and are arranged at an angle to support the seat panel 44. The rear end of the reinforcing rib is protruding to facilitate connection between the backrest 45 and the third support member 43. A receiving slot is formed between the two reinforcing ribs to accommodate the middle section of the third support member 43 in the folded state, facilitating full folding of the seat assembly 4. The third support member 43 may be configured as an N-shaped structure with curved ends to facilitate rapid folding of the backrest 45.

[0050] Furthermore, the first support member 41 is hollow, and the second support member 42 is located within the hollow portion of the first support member 41. It is understood that the hollow configuration of the first support member 41 facilitates reducing the overall weight of the first support member 41. At the same time, the second support member 42 can be located within the hollow portion, fully utilizing the internal space of the first support member 41 and minimizing the space occupied by the first support member 41 and the second support member 42 that integrally support the seat plate 44. The fifth and sixth connecting portions 223 and 224 extend upward from the middle of the crossbeam. The fifth and sixth connecting portions 223 and 224 are arranged at an angle to facilitate expansion and folding in a parallelogram configuration with the seventh and eighth connecting portions 441 and 442.

[0051] Optionally, the front chassis frame 21 is provided with a reinforcing crossbeam 226, the middle portion of which is recessed downward to create a storage space 227 for accommodating the tiller 14 of the front wheel assembly 1. It is understood that the provision of the reinforcing crossbeam 226 can strengthen the strength of the front chassis frame 21, thereby improving the overall strength of the mobility scooter. The storage space 227 formed by the recessed middle portion of the reinforcing crossbeam 226 facilitates folding the tiller 14 into the storage space 227 when the mobility scooter is folded, thereby reducing the space occupied by the mobility scooter in the folded state. The tiller 14 can be retractable to facilitate height adjustment of the handlebar and control panel, improving user comfort. The tiller 14 can also be provided with a lighting lamp 12. The lower end of the tiller 14 is rotatably mounted on the front wheel crossbeam 11 and connected to the front wheel 15 via the rocker arm 13.

[0052] Optionally, the first connecting portion 111, the third connecting portion 211, and the fourth connecting portion 221 all extend into the installation space. It is understood that by extending the first connecting portion 111, the third connecting portion 211, and the fourth connecting portion 221 into the installation space, the connecting rod assembly 5 can be easily fitted into the installation space, fully utilizing the space within the installation space and making the overall structure and layout of the mobility scooter more compact. The rear end of the second connecting rod 52 can be curved. In the deployed state, the upper end of the third connecting rod 53 is tilted toward the rear wheel 31, and the middle portion of the fourth connecting rod 54 is curved to facilitate avoiding crossbeams.

[0053] Optionally, an elastic buffer 228 is provided on the seat cross member 222 to elastically abut the second support member 42. As will be appreciated, the elastic buffer 228 provides elasticity to the seat plate 44, thereby enhancing riding comfort. The seat cross member 222 includes a flange extending into the mounting space for the elastic buffer 228, which is angled and abuts against the arcuate surface at the bottom of the second support member 42. The elastic buffer 228 can be a hydraulic or spring buffer.

[0054] In addition, the front chassis frame 21 is provided with a first shell 7 that matches the contour of the front chassis frame 21 , the rear chassis frame 22 is provided with a second shell 8 , and the rear wheel assembly 3 is provided with a third shell 9 that extends a fender toward the rear wheel 31 .

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "more than one" means two or more, unless otherwise specifically defined.

[0057] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0058] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or several embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0060] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A portable folding scooter, characterized in that: include: front wheel assembly, chassis frame, rear wheel assembly, seat assembly and connecting rod assembly; The front wheel assembly has a front wheel cross beam, and the front wheel cross beam defines a first connecting portion and a second connecting portion; The chassis frame comprises a front chassis frame and a rear chassis frame, the front chassis frame defines a third connecting portion, the rear chassis frame defines a fourth connecting portion, both ends of the front chassis frame are hingedly connected to the second connecting portion and the rear chassis frame in a one-to-one correspondence to construct an installation space, a limiting structure is provided between the rear chassis frame and the front chassis frame to limit the reverse folding of the two, and a seat cross beam of the rear chassis frame defines a fifth connecting portion and a sixth connecting portion; The rear wheel assembly is mounted on the rear end of the rear chassis frame; The seat assembly comprises a first support member, a second support member, a third support member, a seat plate and a backrest, the seat plate defining a seventh connection portion and an eighth connection portion, two ends of the first support member being hingedly connected to the sixth connection portion and the eighth connection portion in a one-to-one correspondence, two ends of the second support member being hingedly connected to the fifth connection portion and the seventh connection portion in a one-to-one correspondence, upper ends of the first support member and the second support member being inclined toward the front wheel assembly, two ends of the third support member being hingedly connected to the backrest and the second support member in a one-to-one correspondence, and the seat plate being hingedly connected to the backrest; The connecting rod assembly has a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, the two ends of the first connecting rod are hinged to the first connecting part and the second connecting rod in a one-to-one correspondence, the two ends of the second connecting rod are hinged to the third connecting part and the third connecting rod in a one-to-one correspondence, the third connecting rod is hinged to the fourth connecting part, and the two ends of the fourth connecting rod are hinged to the third connecting rod and the first support member in a one-to-one correspondence.

2. The portable folding scooter according to claim 1, wherein: The limiting structure includes a groove and a protrusion. The protrusion can be embedded in the groove and abut against each other to limit the rear chassis frame and the front chassis frame from folding in reverse.

3. The portable folding scooter according to claim 2, wherein: The groove is arranged at the rear end of the front chassis frame, the protrusion is arranged at the front end of the rear chassis frame, and the groove and the protrusion are hinged at the lower end.

4. The portable folding scooter according to claim 1, wherein: It also includes a handle assembly, which has a limit rod, a handle and a locking piece. The limit rod is installed on the rear chassis frame, and the limit rod can abut the second support member to limit the front chassis frame and the rear chassis frame from folding in reverse. The handle is swingably installed on the limit rod. When the handle is pulled upward, the front chassis frame and the rear chassis frame fold in a folding direction, and the locking piece is suitable for locking the handle in a horizontal state.

5. The portable folding scooter according to claim 1, wherein: The first connecting rod is configured to protrude upwards to create a clearance space for the rear wheel assembly.

6. The portable folding scooter according to claim 1, wherein: The first support member defines a support portion, and the support portion is disposed adjacent to a hinge joint between the first support member and the seat plate to support the third support member.

7. The portable folding scooter according to claim 6, wherein: The first supporting member is hollow, and the second supporting member is located in the hollow portion of the first supporting member.

8. The portable folding scooter according to claim 1, wherein: The front chassis is provided with a reinforcing crossbeam, the middle portion of which is recessed downward to form a storage space for the rudder stock of the front wheel assembly.

9. The portable folding scooter according to claim 1, wherein: The first connection portion, the third connection portion, and the fourth connection portion are all extended toward the installation space.

10. The portable folding scooter according to claim 1, wherein: It also includes an elastic buffer component, which is arranged on the seat cross beam to elastically abut against the second support component.

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