Portable vehicle with bottom reinforcement structure

Abstract

The invention relates to a portable vehicle, in particular to a portable vehicle with a bottom reinforcing structure, comprising: a chassis assembly for providing a bottom support; the frame assembly is used for forming a containing space of the portable vehicle, and the chassis assembly and the frame assembly are connected through a lower corner coupling piece; the handle assembly is used for providing driving force for the underframe assembly and / or the frame assembly; the wheel assembly is used for supporting the chassis assembly and / or the frame assembly and driving the chassis assembly and / or the frame assembly to move; the bottom frame assembly comprises a base and a base rod, and the base rod is rotationally connected with the base. The base is provided with a base reinforcing structure, and the base reinforcing structure is used for providing supporting force for the base and / or the base rod. The portable vehicle is light in weight, low in cost, small in occupied space when folded and high in expandability.

Description

Technical Field

[0001] The present application generally relates to portable vehicles including carts, trailers, camping cars, camping cars, and beach cars, and more specifically to a small portable vehicle that can be switched between an unfolded state and a folded state and is generally driven by manpower (or electricity or other energy sources). Background Art

[0002] In outdoor activities such as camping, picnics, beach parties, and some household transportation occasions, there is a demand for vehicles that can carry large and heavy goods at one time. At the same time, since such vehicles need to be transported with the vehicle or stored at home, high requirements are also placed on their portability such as folding convenience, folded volume, and body weight.

[0003] There is a technical solution for a portable vehicle: its main frame adopts an X-shaped structure, which can be folded and unfolded by utilizing the characteristic that the X-shaped structure can rotate around the central pivot point. However, the length of the two support rods of the X-shaped structure spans the two ends of the portable vehicle frame that are farthest apart, resulting in a long length of the support rods, and in order to ensure its strength, it is often necessary to use metal materials, resulting in an increase in the weight of the entire portable vehicle. In addition, for the frame of the X-shaped structure, since its height changes between the folded state and the unfolded state, the longitudinal support rod of the portable vehicle must be made into a telescopic rod structure with at least two sections connected, further increasing the weight of the portable vehicle.

[0004] In addition, the portable vehicle has a certain depth to form a space for accommodating goods. Therefore, the carrying capacity of the portable vehicle is also limited by the size of its frame. This is one of the biggest differences between the portable vehicle with the above design and the ordinary flatbed vehicle. As for the above design of the portable vehicle, although the metal material and the height limit of the X-shaped structure can ensure the strength and stability of the body frame, when facing larger volume goods, such a portable vehicle often cannot completely accommodate such goods, resulting in the goods falling, which limits the application scope of the portable vehicle.

[0005] When the portable vehicle is in a folded state, it is often necessary to fasten the frame of the portable vehicle with a cable tie or a bag to keep it in the folded state, otherwise the portable vehicle tends to unfold to an open state. Such a technical solution for maintaining the folded state introduces independent, additional components (such as cable ties or bags), which increases the overall weight of the portable vehicle in the folded state, and such additional components are not conducive to storage and are easy to lose.

[0006] Chinese utility model patent CN215752484U discloses a folding trailer which does not have an X-shaped structure on the side, but is replaced by a support rod that is longer in the length direction and can be folded around a folding switch. Although such a structure can reduce the weight of the entire vehicle, the support rod of the folding trailer is very easy to deform and damage when subjected to a downward force, which reduces the body stability of the entire folding trailer and also reduces the load-bearing capacity of the folding trailer.

[0007] Chinese utility model patent CN208760679U discloses a folding cart, which also uses a long support rod in the length direction that can be folded around a rotating member, and in order to improve the force bearing capacity of the support rod in the length direction, four diagonal support rods are introduced. However, the introduction of the diagonal support rods also inevitably increases the weight of the camping cart.

[0008] Chinese utility model patent CN208760679U also discloses that a support rod with a longer length is composed of two support sections, and the two support sections are connected by a rotation limit device. The rotation limit device is circular as a whole, including a rotating seat and a rotating body, and the rotating seat and the rotating body can rotate relative to each other. A limiting structure is arranged inside the rotation limit device to limit the rotation angle between the rotating seat and the rotating body. The two support sections constituting the support rod are respectively connected to the rotating seat and the rotating body of the rotation limit device. The support sections can rotate inwards to present a "V"-shaped folding state under the drive of the rotation limit device, which is convenient for the folding of the portable vehicle. Such a rotation limit device can only achieve unidirectional limiting, and cannot achieve bidirectional limiting. For example, it can only limit the support rod from being further folded upward from the unfolded state to an inverted "V" shape, and cannot limit the support rod from being unfolded to being folded. In this case, the frame stability of the portable vehicle in the unfolded state cannot be guaranteed. On the other hand, the support rod has a certain length, and the rotation limit device is equivalent to a fulcrum, which corresponds to a longer force arm. When the support rod is subjected to force, the torque borne by the rotation limit device increases exponentially, which puts very high requirements on the strength and reliability of the rotation limit device itself.

[0009] Based on the above technical problems, a portable vehicle of the present invention is proposed. Summary of the invention

[0010] In one embodiment, the present invention discloses a portable vehicle with a bottom reinforcement structure, comprising: a chassis assembly for providing bottom support; a frame assembly for forming a storage space for the portable vehicle, the chassis assembly and the frame assembly being connected via a lower corner coupling; a handle assembly for providing driving force to the chassis assembly and / or the frame assembly; a wheel assembly for supporting the chassis assembly and / or the frame assembly and driving the movement of the chassis assembly and / or the frame assembly; the chassis assembly comprising a base and a base rod, the base rod being rotatably connected to the base; the base having a base reinforcement structure, the base reinforcement structure being used to provide supporting force to the base and / or the base rod.

[0011] Furthermore, the base reinforcement structure is a base extension portion, which extends to the four diagonals of the base frame assembly; the base extension portion is provided with a base rod mounting groove, the base rod mounting groove is provided with a base rod mounting hole, and the base rod is rotatably connected to the base through the base rod mounting hole; the base rod mounting groove is open at the bottom and closed at the top to limit the base rod from rotating upward around the base rod mounting hole.

[0012] Furthermore, the ratio of the diagonal length of the base extension portion to the diagonal length of the base frame is in a range of 10% to 35%.

[0013] Furthermore, the distance between the mounting holes of the two oppositely disposed base rods is less than half of the diagonal length of the base extension portion.

[0014] Furthermore, the base reinforcement structure includes a traction member, one end of which is mounted to the base, and the other end of which is mounted to the base rod and / or the lower corner coupling member; in the unfolded state, the traction member provides a pulling force or a pushing force with an upward component to the base.

[0015] Furthermore, the base also includes: a fixing seat, which is installed on the base and can apply a force to the base; one end of the traction member is connected to the fixing seat.

[0016] Furthermore, the traction member includes a first pull rod and a second pull rod, one end of the first pull rod is rotatably connected to the fixed seat, the other end of the first pull rod is connected to one end of the second pull rod through a rotating connecting member, and the other end of the second pull rod is rotatably connected to the supporting connecting member.

[0017] Furthermore, the rotating connection member includes at least two rotating connection parts, and there is a certain distance between the at least two rotating connection parts.

[0018] Furthermore, the traction member is a rigid traction rope; one end of the rigid traction rope is connected to the base, and the other end of the rigid traction rope is connected to the base rod; the length of the rigid traction rope is equal to or less than the distance between the two installation positions on the base and the base rod for connecting the rigid traction rope in the unfolded state.

[0019] Furthermore, the traction member is an elastic rope; one end of the elastic rope is connected to the base, and the other end of the elastic rope is connected to the base rod; the length of the elastic rope in the state without elastic deformation is greater than 70% of the distance between the two installation parts on the base and the base rod for connecting the elastic rope in the unfolded state.

[0020] The above summary does not include an exhaustive enumeration of all aspects of the invention. It is contemplated that the present invention includes all systems and methods that can be implemented by all suitable combinations of the various aspects summarized above and disclosed in the detailed description below and specifically pointed out in the claims filed with this patent application. Such combinations have specific advantages not specifically set forth in the above summary. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings in which like reference numerals indicate similar elements. It should be noted that references to "an" or "an" embodiment in this disclosure are not necessarily to the same embodiment.

[0022] Figure 1 A schematic diagram showing a portable vehicle in a first embodiment of the present invention in an unfolded state;

[0023] Figure 2 A schematic diagram showing a portable vehicle in a folded state according to a first embodiment of the present invention;

[0024] Figure 3 A schematic diagram showing the bottom structure of a portable vehicle according to a first embodiment of the present invention;

[0025] Figure 4 A schematic diagram showing the structure of a corner coupling member of a portable vehicle according to a first embodiment of the present invention is shown;

[0026] Figure 5 A schematic structural diagram showing another perspective of the corner coupling member of the portable vehicle of the first embodiment of the present invention;

[0027] Figure 6 A schematic diagram showing the structure of a portable vehicle from a top view of a first embodiment of the present invention;

[0028] Figure 7 A schematic diagram of a portable vehicle frame structure of a first embodiment of the present invention is shown;

[0029] Figure 8 A schematic diagram showing a portable vehicle in an unfolded state according to a second embodiment of the present invention;

[0030] Fig. 9A detailed structural diagram of a support rod of a portable vehicle according to a second embodiment of the present invention is shown;

[0031] Fig.10 A schematic diagram showing a portable vehicle in a folded state according to a second embodiment of the present invention;

[0032] Fig.11 A schematic diagram showing the bottom structure of a portable vehicle according to a second embodiment of the present invention;

[0033] Fig.12 A detailed structural diagram showing a support rod of a portable vehicle according to a second embodiment of the present invention;

[0034] Fig.13 A schematic diagram showing a portable vehicle in a third embodiment of the present invention in an unfolded state;

[0035] Fig.14 Schematic diagrams showing the detailed structure of a support rod of a portable vehicle according to a third embodiment of the present invention at different viewing angles;

[0036] Fig.15 Schematic diagrams showing the detailed structure of a support rod of a portable vehicle according to a third embodiment of the present invention at different viewing angles;

[0037] Fig.16 Shows Fig.13 A schematic diagram of the structure of the lower corner coupling member in the dashed box;

[0038] Fig.17 A schematic diagram showing a portable vehicle according to a third embodiment of the present invention in an unfolded state with a frame separated;

[0039] Fig.18 A schematic diagram showing the assembly of the lower corner coupling member and the longitudinal support rod of the portable vehicle of the third embodiment of the present invention;

[0040] Fig.19 A schematic diagram showing a portable vehicle according to a third embodiment of the present invention in an unfolded state with a frame separated;

[0041] Fig. 20 A schematic diagram showing a portable vehicle according to a third embodiment of the present invention in a state of being unfolded into a flatbed vehicle. DETAILED DESCRIPTION

[0042] In this section, we will explain several embodiments of the present invention with reference to the accompanying drawings. Whenever the shapes, relative positions and other aspects of the components described in the embodiments are not clearly defined, the scope of the present invention is not limited to the components shown. The components shown are only for illustrative purposes. In addition, although many details are set forth, it should be understood that some embodiments of the present invention can be implemented without these details. In other cases, well-known structures and technologies are not shown in detail to avoid blurring the understanding of this description.

[0043] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. Spatially related terms, such as "under ... ", "under ... ", "above ... ", "on ", etc. can be used for the convenience of description in this article, to describe the relationship between an element or feature and another one or more elements or one or more features, as shown in the accompanying drawings. It should be understood that spatially relative terms are intended to cover different orientations in the use or operation of the equipment except the orientation shown in the accompanying drawings. For example, if the equipment in the accompanying drawings is turned over, the elements described as "under" or "under" other elements or features can then be oriented to "above" other elements or features. Therefore, the exemplary term "under ... " can cover these two orientations above ... and below .... Equipment can be oriented in other ways (for example, rotated 90 degrees or in other orientations), and other spatially relative terms used in this article should also be interpreted in the above manner.

[0044] As used herein, the singular forms "a", "an", "the", etc. are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "include" and / or "comprise" define the presence of features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or their collections.

[0045] As used herein, the terms "or" and "and / or" should be interpreted as inclusive or meaning any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition will only occur when a combination of elements, functions, steps, or acts are inherently mutually exclusive to some extent.

[0046] The term "connection" as used herein includes various connection methods including direct connection and indirect connection, and does not require physical contact between the connected parts. For example, it includes various specific connection methods including snap connection, screw connection, connection without a fixing device, welding, riveting, and one-piece molding. In the case of component matching, it includes various matching relationships such as clearance fit, transition fit, interference fit or variable clearance.

[0047] First Class Embodiment

[0048] Figure 1-2 is a schematic diagram of a first embodiment of the present invention, wherein Figure 1 is a schematic diagram of the unfolded state of the portable vehicle of the present invention, Figure 2 It is a schematic diagram of the portable vehicle of the present invention in a folded state.

[0049] The portable vehicle 10 includes a frame assembly 110, a front handle assembly 120, a chassis assembly 140, a wheel assembly 150, and a tailgate assembly 160. The frame assembly 110 includes an upper frame and a lower frame and a longitudinal support rod 1109 arranged between the upper and lower frames. The upper frame includes a first support rod arranged in the length direction and a second support rod arranged in the width direction, and the first support rod and the second support rod are connected by an upper corner coupling 1001 to form a quadrilateral frame. As an optional embodiment, when the frame of the vehicle adopts the design of the existing X assembly, the first support rod and the second support rod refer to rods connected to the upper corner coupling or the lower corner coupling, and are divided into rods located in the length direction and the width direction, and the rods and other rods together form an X structure. As other optional embodiments, the frame of the portable vehicle can adopt a mixed frame structure, such as using the transverse support rod of the present invention in the length direction and the X-shaped structure in the width direction, or using the X-shaped structure in the length direction and the transverse support rod of the present invention in the width direction. Regardless of the structure of the frame, as long as there is a support rod connected to the upper or lower corner coupling piece, the definition of the first support rod and the second support rod of the present invention can be met.

[0050] In this embodiment, the first support rod includes two first support segments 1102, one end of the first support segment 1102 is connected to the upper corner coupling piece 1001, and the other end is directly or indirectly connected to the adjacent first support segment. As an optional embodiment, the first support rod includes three or more first support segments, the first support segments located at both ends of the first support rod are connected to the upper corner coupling piece, and the other first support segments are directly or indirectly connected to each other.

[0051] like Figure 2As shown, the two first support sections 1102 are connected by a rotating connecting member. In this embodiment, the rotating connecting member is an axle rod 1107. Axle holes are respectively provided at both ends of the axle rod 1107. The first support sections 1102 arranged on both sides of the axle rod 1107 are rotatably connected to the axle rod through the axle holes arranged on the axle rod, so that the two first support sections 1102 can rotate and fold relative to each other, so as to switch between the folded state and the unfolded state. When the portable vehicle is in the unfolded state, the two first support sections 1102 are basically straight; when the portable vehicle is in the folded state, the two first support sections 1102 are in a "V"-shaped folded state, so that the space occupied by the entire portable vehicle is reduced and the portability is improved. As an optional embodiment, the first support sections can be connected by a rotating shaft. This connection method does not introduce an independent rotating connection component, which reduces the structural complexity of the portable vehicle.

[0052] The first support rod is provided with a support reinforcement member. In the present embodiment, the support reinforcement member is a support sleeve 1103, which is sleeved on the first support rod and can slide along the first support rod. When the portable vehicle is in the unfolded state, the support sleeve 1103 slides to the connection part of the two first support sections 1102. The support sleeve 1103 spans the shaft rod 1107 and the first support sections 1102 arranged at both ends of the shaft rod, and plays the role of supporting the shaft rod and the left and right first support sections, so that the first support rod maintains a generally straight unfolded state. The support sleeve can be set to be hollow so as to be sleeved on the support section, or it can be used as an independent component. In this case, the support sleeve is provided with a notch to facilitate the installation of the support sleeve on the support rod.

[0053] When the portable vehicle is in the unfolded state, the first support rod will be subjected to the downward gravity, so that the first support rod tends to be bent in a V-shaped state. In addition, when the portable vehicle is in use, the first support rod may be subjected to downward force due to the operator's pressing, the placement of heavy objects, etc., and is also prone to deformation. The support sleeve 1103 spans the shaft and the first support segments set at both ends of the shaft, and can keep the first support rod in a basically straight state through a sleeve with a certain hardness; on the other hand, the support sleeve 1103 has a certain length. Since the fulcrum of the first support segment is located at the rotation axis position of the shaft in the folded or free movement state, when the support sleeve 1103 has a certain length and spans the shaft and the adjacent support segment, the fulcrum of the first support segment will move from the rotation axis position of the shaft to the end position in contact with the support sleeve, which is equivalent to moving the fulcrum of the first support segment 1102 toward the direction of the angle coupling 1001, reducing the torque applied to the first support segment 1102, thereby reducing the deformation of the first support segment.

[0054] In this embodiment, the length of the support sleeve 1103 is greater than the length of the shaft but less than the length of at least one first support segment 1102. With such a configuration, when the portable vehicle is in a folded state, the support sleeve 1103 can be stored on a first support segment and the end of the support sleeve will not be exposed from the support segment, thereby avoiding interference of the support sleeve with folding, so that the portable vehicle can be folded smoothly.

[0055] When the support sleeve supports the first and second support sections, its relative position with the first and second support sections remains substantially unchanged. As an optional embodiment, there may be a certain friction force between the support sleeve and the first and / or second support sections, or the relative position between the support sleeve and the first and / or second support sections may be kept stable by a lock, or they may be fixed by threaded matching. As for the threaded matching method, as an optional embodiment, a thread is provided on the first support section, and a corresponding thread is provided inside the support sleeve. When the portable vehicle is in the unfolded state, the support sleeve is fixed to the first support section by the thread, and when the portable vehicle is in the folded state, the support sleeve is smoothly stored in the second support section. Ensuring that the relative position between the support sleeve and the first and second support sections remains substantially unchanged in the unfolded state can make the unfolded state of the portable vehicle more stable.

[0056] Compared to the folding vehicle structure of the X-shaped side frame, the frame of the portable vehicle of the present invention adopts a transversely arranged first support rod, so the strength of the first support rod, especially the anti-deformation performance of the support rod when bearing the pressure of a heavy object, is crucial. The shaft rod 1107 of this embodiment has a certain length. By setting the shaft rod with a certain length, the length of the first support section can be reduced while the overall length of the first support rod of the portable vehicle remains unchanged. Since the bending strength of a shorter rod-shaped object is higher than that of a longer rod-shaped object, such a setting can improve the bending strength of the first support section, thereby improving the bending strength of the first support rod as a whole. The lower limit of the ratio of the length of the shaft rod to the length of the first support rod in this embodiment includes 1 / 20, 1 / 10, 1 / 8, and 1 / 5, where the "length of the first support rod" includes the length of the shaft rod 1107 and the sum of the lengths of the two support sections 1102. When the ratio of the length of the shaft rod to the length of the first support rod is above the above lower limit, the length of the first support section can be effectively reduced and the bending resistance of the first support section can be improved. The upper limit of the ratio of the length of the shaft rod to the length of the first support rod in this embodiment includes 1 / 3, 3 / 10, 4 / 15, and 1 / 4, where the "length of the first support rod" includes the length of the shaft rod 1107 and the sum of the lengths of the two support sections 1102. Since the shaft rod is in a horizontal position in the bent state, the length of the shaft rod will affect the lateral compactness of the folded portable vehicle. When the ratio of the length of the shaft rod to the length of the first support rod is below the above upper limit, the folding compactness of the portable vehicle can be improved. As an optional embodiment, the length of the shaft rod is 1 / 20 to 1 / 3 of the length of the first support rod. For example, if the length of the first support rod is 100 cm, the length of the shaft rod ranges from 5 cm to 33 cm. As another embodiment, the length of the shaft rod is 1 / 8 to 3 / 10 of the length of the first support rod. As yet another embodiment, the length of the shaft rod is 1 / 5 to 1 / 4 of the length of the first support rod. When the length of the shaft rod is within the above range, it can reduce the length of the first support section, thereby improving the bending resistance of the first support section itself, and at the same time reduce the space occupied by the portable vehicle in the folded state.

[0057] For the second support rod in the width direction, it has at least two second support sections 1105, and the at least two second support sections 1105 can switch with each other in the folded or unfolded state. In this embodiment, taking the two second support sections 1105 as an example, the two second support sections 1105 are connected by a connecting shaft. As an optional embodiment, the two second support sections can also be connected by other connecting components such as an axle rod. A support sleeve 1106 is also provided on the second support rod. When the portable vehicle is in the unfolded state, the support sleeve moves to the connection part of the two second support sections 1105, spanning the two second support sections, so that the second support rod is generally in a straight line state. As an optional embodiment, the length of the support sleeve 1106 is less than the length of the second support section. When the portable vehicle is in the folded state, the support sleeve can be stored in any second support section to ensure that the portable vehicle can be folded smoothly. The support sleeve can be set to be hollow to be sleeved on the support section, or it can be used as an independent component. In this case, the support sleeve is provided with a notch to facilitate the installation of the support sleeve on the support rod.

[0058] The upper corner coupling member 1001 is used to connect the first support rod and the second support rod, and to connect the longitudinal support rod 1108. The upper corner coupling member 1001 has three extensions, which respectively form a receiving groove for accommodating the first support rod, the second support rod and the longitudinal support rod, and each two extensions are perpendicular to each other. As an optional embodiment, any one of the three extensions can be provided separately, so as to facilitate modular design. The upper corner coupling member is provided with a rotating shaft hole, and the connecting sections corresponding to the first support rod and the second support rod are rotatably connected to the upper corner coupling member 1001 through the rotating shaft hole. The upper corner coupling member 1001 is used to accommodate the receiving groove of the first and second support rods, which is open at the bottom and closed at the top, and is used to limit the rotation direction of the first and second support rods. Under the limiting action of the upper corner coupling member, the folding direction of the first support rod and the second support rod is limited to only move downward for folding. The upper corner coupling is provided with a fixing groove in the vertical extension portion, and the longitudinal support rod 1108 is arranged in the fixing groove to achieve connection and fixation with the upper corner coupling. The method for fixing the longitudinal support rod can be screws, bolts, buckles, etc., and the upper corner coupling and the longitudinal support rod can even be integrally formed to ensure the connection stability between the upper corner coupling and the longitudinal support rod. The extension portion referred to in this embodiment is an additional extension portion from the rotation axis hole position of the corner coupling, and the extension length is greater than 1 / 20 of the corresponding support rod. The extension portion plays an additional supporting and limiting role for the rod installed on the corner coupling.

[0059] As an optional embodiment, the upper corner coupling is provided with only one or two extensions, for example, the upper corner coupling is provided with only a first extension for accommodating the length direction support rod, or is provided with only a second extension for accommodating the width direction extension rod, or is provided with both the first and second extensions. In the case of providing only one or two extensions, the overall weight of the upper corner coupling can be reduced as much as possible.

[0060] As an optional embodiment, the lower frame includes a third support rod 1113 arranged in the length direction and a fourth support rod 1114 arranged in the width direction, and the third support rod and the fourth support rod are respectively connected to the lower corner couplings 1002 and 1003 to form the lower frame. The lower corner couplings 1002 and 1003 are provided with receiving grooves in the length direction and the width direction, and the upper part of the receiving groove is open, which is used to limit the third support rod and the fourth support rod. The ends of the third support rod 1113 and the fourth support rod 1114 are detachably connected to the receiving grooves of the lower corner couplings. When the portable vehicle is in a folded state, the third support rods 1113 and 1114 can be removed from the receiving grooves of the lower corner couplings, so that the portable vehicle can be folded smoothly, reducing the space occupied by the portable vehicle. In this embodiment, the third and fourth support rods can improve the supporting strength of the lower frame, and when it is necessary to install a bottom plate at the bottom of the portable vehicle, the third and fourth support rods can provide a bottom plate supporting structure to improve the stability of the bottom plate installation.

[0061] There is no particular restriction on the material of the third and fourth support rods, and metal materials or plastic materials may be used. When the third and fourth support rods are made of plastic materials, the weight of the third and fourth support rods can be reduced, making the portable vehicle lightweight.

[0062] As an optional embodiment, the third support rod 1113 and the fourth support rod 1114 are folding rods. When the portable vehicle is in a folded state, the third and fourth support rods are in a "V" folded state. With such a design, there is no need to remove the third and fourth support rods when the portable vehicle is folded, which can make the folding of the portable vehicle more convenient.

[0063] like Figure 1 , Figure 3As shown, the portable vehicle further includes a chassis assembly 140, which includes a base 1401, and the base 1401 has a base extension 1404 extending along the diagonal of the chassis. The base 1401 is provided with a base rod mounting groove, and the base rod mounting groove is provided with a mounting hole, and one end of the base rod 1402 is rotatably mounted to the base rod mounting groove through the mounting hole. The base rod mounting groove is open downward to limit the base rod 1402 from rotating upward. When the portable vehicle is in the unfolded state, the chassis assembly 140 is in the extended state, and the base rod 1402 is close to or close to the upper part of the base rod mounting groove of the base 1401. When the base 1401 is subjected to gravity, the base rod 1402 can provide an upward reaction force through the rotating shaft and the base extension to prevent the base 1401 from moving downward and causing the bottom of the portable vehicle to be concave. The base extension 1401 has a certain length. In the present embodiment, the diagonal length of the two diagonally arranged base extensions 1404 is y, and the diagonal length of the chassis assembly is d. The lower limit of the ratio range of y to d includes 10%, 15%, and 20%. By setting the ratio of the diagonal length of the base extension to the diagonal length of the chassis assembly to be greater than the lower limit, the base mounting groove can cover a longer length of the base rod, thereby further improving the load-bearing capacity of the base 1401; the upper limit of the ratio range of the diagonal length y of the base extension 1404 to the diagonal length d of the chassis assembly includes 25%, 30%, and 35%. Since the base extension itself is rigid or nearly rigid and plays a load-bearing role, the base extension cannot be folded together when the portable vehicle is in a folded state. By setting the diagonal length of the base extension 1404 to below the upper limit value, the folding compactness of the portable vehicle can be improved, and the base can be prevented from occupying too much space in the folded state. The ratio of the diagonal length y of the base extension 1404 to the diagonal length d of the base frame assembly ranges from 10% to 35%, optionally from 15% to 30%, and further optionally from 20% to 30%.

[0064] The distance between the installation positions of the two relatively arranged base rods and the base is less than half of the diagonal length y of the base extension part. With such an arrangement, each base rod can be installed as close to the center of the base as possible to improve the supporting effect of the base extension part on the base rod.

[0065] The other end of the base rod 1402 is mounted to the lower corner couplings 1002, 1003 and is able to rotate around the lower corner couplings. Figure 2As shown, in the folded state, the base 1401 is lifted upward, the base rod 1402 is retracted inward, the base rod pulls the lower corner couplings closer to each other, and drives the upper frame and the lower frame to fold, at this time, the upper corner couplings are also close to each other. The portable vehicle finally presents a folded state in which the upper corner couplings surround and approach the base, the horizontal support rods are folded or removed, and the longitudinal support rods are close to each other.

[0066] like Figure 1 As shown, the portable vehicle further includes a tailgate assembly 160, which is arranged at one end of the portable vehicle frame away from the front handle. The tailgate includes a tailgate bracket 1601 and a staggered rod 1602 arranged between the tailgate brackets. The staggered rod 1602 is a kind of tailgate blocking member, which can prevent the cargo placed in the portable vehicle frame from leaking out from the rear of the portable vehicle. One end of the tailgate bracket 1601 is connected to the lower corner coupling member 1002. As an optional embodiment, this connection can be a rotating connection, through which the tailgate can be switched between the retracted and lowered states. When the tailgate is retracted, the tailgate plays a role in preventing the objects in the portable vehicle frame from leaking out; when the tailgate is lowered, the horizontal loading area of ​​the portable camping vehicle can be increased. At this time, if the portable vehicle can remove the longitudinal support rods and the upper frame together to become a flatbed vehicle, the loading area of ​​the flatbed vehicle can be further increased. As an optional embodiment, the tailgate can be arranged in an integrated manner, such as being arranged in a "U" shape. As another optional implementation, the blocking member of the tailgate may be a structure such as a steel wire rope, an elastic rope, a net bag, or other structures arranged between the tailgate frames to prevent objects from leaking out.

[0067] Figure 4 , Figure 5The following is a detailed view of the upper corner coupling member of the present embodiment. The extension of the upper corner coupling member 1001 in the direction of the first support rod is the first extension portion 1002, which has a certain length, and a frame limit portion 1003 is provided at the corner position of the end of the first extension portion. In the present embodiment, the frame limit portion 1003 is an elastic limit portion, including a spring and a ball fixed to one end of the spring. When the ball is subjected to pressure, it will move downward and press the spring to cause it to produce elastic deformation. At this time, the first support rod can smoothly rotate in the first extension portion. When the pressure on the ball is removed, the spring pops outward and causes the ball to move outward to protrude from the end face of the extension portion. At this time, the rotation of the first support rod in the first extension portion will be limited by the frame limit portion, thereby increasing the difficulty of changing the position of the first support rod. As shown by the dotted line, specifically, when the first support rod is in the unfolded state, the elastic limiting portion is located at the lower side of the first support rod, limiting the downward movement of the first support rod, so that the first support rod remains in the unfolded state; when the first support rod is in the folded state, the elastic limiting portion is located on the outer side of the first support rod, limiting the outward movement of the first support rod, so that the first support rod remains in the folded state. With such a design, the state stability of the portable vehicle in the folded and unfolded states can be improved. In this embodiment, the limiting structure of the elastic limiting portion adopts a sphere, which can utilize the movement of the first support rod on the sphere to generate downward pressure, thereby conveniently pressing the sphere. The sphere here can also be other structures with curved surfaces, including a hemisphere and an ellipsoid.

[0068] As an optional embodiment, the limiting portion is a non-elastic limiting portion (not shown in the figure), and further optionally, the non-elastic limiting portion is a latch limiting device, including a latch hole provided at the corner of the corner coupling and a latch capable of moving in the latch hole. When the portable vehicle needs to change its position, the latch is pulled out of the latch hole, and the support rod is no longer limited by the latch and can rotate freely. When the portable vehicle is in an expanded or folded state and needs to maintain this state, the latch is locked, and the latch provided at the corner of the corner coupling limits the support rod, so that the portable vehicle remains in an expanded or folded state, thereby improving the convenience of use of the portable vehicle. As other optional embodiments, the non-elastic limiting portion can also adopt other structures such as screws and buckles.

[0069] As other optional embodiments, the limiting portion can also be set at the corner position of any corner coupling extension or at the corner position of the base extension. When the frame limiting portion is set at the corner position of the lower corner coupling extension, the frame limiting portion can limit the third and / or fourth support rods; when the base extension is set at the corner position of the base, it can limit the base rod. When the portable vehicle is in a folded or unfolded state, the limiting portion limits the support rod and / or the base rod, preventing the portable vehicle from unfolding autonomously in the folded state, and also preventing the portable vehicle from folding due to a force in a specific direction in the unfolded state.

[0070] like Figure 1 , 2As shown, the front handle assembly 120 is arranged at the front of the portable vehicle. The main function of the handle assembly is to provide pulling force. Such an operation mode is more suitable for occasions where a portable vehicle with a large load is pulled. The front handle assembly 120 includes a grip 1201, which is mounted on a handle frame 1202. The handle frame 1202 is U-shaped. With such a design, sufficient gripping space can be left between the grip and the handle frame to improve the grip comfort of the handle. The grip 1201 can be covered with leather or imitation leather materials to improve the grip comfort. The space enclosed by the handle frame 1202 and the grip 1201 can also be provided with a buffer structure by sponge, leather or imitation leather materials to further improve the grip comfort. The handle frame 1202 is connected to the handle rod, which includes three sections of telescopic rods 1203, 1204, and 1205 that are mutually sleeved. The telescopic rods 1203 and 1204 can slide relative to the telescopic rod sleeved on the outside thereof to achieve the effect of telescoping and unfolding. A limiting device is provided at the bottom of the telescopic rods 1203 and 1204 to prevent the telescopic rods from being separated from the telescopic rods they are connected to during the extension process. The surface of the telescopic rod of this embodiment is provided with multiple reinforcing ribs in the vertical direction, which can improve the strength of the telescopic rod without adding too much weight and prevent its deformation. As an optional embodiment, other types of reinforcing ribs such as grid-shaped and wavy shapes can also be provided. The handle link 1207 is installed on the handle seat 1206, and the handle seat 1206 is provided with a handle link installation groove. One end of the handle link 1207 is rotatably connected to the handle link installation groove, and the other end of the handle link 1207 is connected to the lower corner coupling. As an optional embodiment, the handle link can also be connected to the lower frame or the chassis. The handle link installation groove has a certain movable space, so that the handle link 1207 can also move within a certain angle range in the installation groove after being connected to the handle link installation groove. At the same time, the other end of the handle link 1207 is installed to the lower corner coupling 1003 through the installation slider 1208. The mounting slider 1208 can rotate in the mounting groove of the lower corner coupling piece along the length direction of the portable vehicle. The mounting slider 1208 is rotatably connected to one end of the handle link 1207. The mounting slider has a certain height and protrudes from the lower corner coupling piece, which raises the installation position of the handle link 1207, avoiding interference between the handle link 1207 and the lower corner coupling piece, so that the handle link 1207 arranged laterally can rotate along the length direction of the portable vehicle with the rotation of the slider. Based on the above arrangement, the front handle assembly 120 can rotate along the length direction of the portable vehicle, and can also rotate a certain angle in the width direction of the portable vehicle. The operator can control the directional operations of the portable vehicle such as turning and getting out of trouble well through the handle, thereby improving the convenience of operation of the portable vehicle.

[0071] The wheel assembly 150 is used to carry the portable vehicle and drive the portable vehicle to move. The wheel assembly includes a front wheel 1501 and a rear wheel 1503. The front wheel 1501 is provided with a brake pad 1502, and the rear wheel 1503 is provided with a brake pad 1504. The front wheel 1501 is a universal wheel, which can improve the directional controllability of the portable vehicle when the handle 120 is used to pull the portable vehicle. As an optional embodiment, the rear wheel 1503 can also be a universal wheel, and a direction locking device is provided on the front wheel 1501 and the rear wheel 1503. When the front handle is used to drive the portable vehicle, the direction locking device of the front wheel 1501 is released, and the direction locking device of the rear wheel 1503 is locked. In this case, only the front wheel has a universal adjustment function. In some scenarios, the portable vehicle has a rear handle, or the vehicle needs to be pushed from the rear end of the portable vehicle. At this time, the direction locking device of the rear wheel 1503 is released, and the direction locking device of the front wheel 1501 is locked. In this case, only the rear wheel has a universal adjustment function. Both the front and rear wheels use a direction locking device. No matter which direction the operator drives the portable vehicle, the wheel close to the driving direction / position can be set as a universal wheel, and the direction of the wheel away from the driving direction / position can be locked, so that the direction of the portable vehicle can be well controlled. As another optional embodiment, the wheel assembly is installed to the portable vehicle body through a quick-release structure. When the universal wheel needs to be replaced / switched, the quick-release structure can be used to quickly achieve the replacement effect. The quick-release structure here is not particularly limited, and includes various quick-release structures including buckles, threads, and elastic sleeves.

[0072] When using the portable vehicle of the first embodiment of the present invention, Figure 1 As shown, in the unfolded state, the first support rod and the second support rod of the upper frame are both in the unfolded state. Specifically, the two first support sections 1102 of the first support rod are arranged relative to each other and are basically located on the same straight line with the shaft rod 1107 connecting the support sections. The two first support sections 1105 of the second support rod are also arranged relative to each other and are basically in a straight line. The support sleeve 1103 is installed to the position of the shaft rod 1107 and spans across the two adjacent support sections 1102. At this time, the support sleeve 1103 simultaneously limits the shaft rod and the support sections on both sides thereof, so that the first support rod is basically in a straight line and can remain in a straight state in the unfolded state. The support sleeve 1106 arranged on the second support rod is installed to the position where the second support sections 1105 are connected to each other in the unfolded state, so that the second support rod can basically remain in a straight line in the unfolded state. In the unfolded state, the handle assembly 120 can be extended to a specific length according to the height of the user or specific needs, so as to facilitate the operation of the user.

[0073] like Figure 2As shown, when the portable vehicle of the first embodiment of the present invention is folded, the shaft of the first support rod moves downward, so that the two first support sections and the second support section rotate around the upper corner coupling, and the first support rod and the second support rod are in a "V" folded shape. At the same time, the base 1401 moves upward, the base rod 1402 moves around the rotation axis of the base extension 1404 and the rotation axis of the lower corner couplings 1002 and 1003, and the upper corner couplings and the lower corner couplings are close to each other, respectively, to achieve inward folding. In the folded state, the support sleeve 1103 is slidably stored on the first support section, and any end of the support sleeve does not contact the shaft or the adjacent support section. In the folded state, the base 1401 and the upper corner coupling 1001 are basically in a state of being attached or close, and the horizontal height of the base 1401 in the folded state is basically flush with the upper part of the corner coupling 1001. With such a design, the space of the portable vehicle can be utilized as much as possible and the size after folding can be reduced. In the folded state, the handle assembly 120 can be in the folded state or in the unfolded state, and the operator can still operate the camping vehicle in the folded state through the handle assembly 120 .

[0074] The portable vehicle as the first embodiment of the present invention can ensure the strength of the vehicle body frame without adopting the X-shaped structure on the side, reduce the overall length of the support rod used in the portable vehicle, reduce the weight of the portable vehicle, and improve the portability of the portable vehicle.

[0075] As an optional embodiment, when the third support rod is foldable, it may cause the problem of the two support rods located on the same vertical plane interfering with each other in the folded state: since the first support rod is in a positive "V" shape when folded, and the third support rod is in an inverted "V" shape when folded, the two may interfere with each other in the folded state.

[0076] like Figure 6 The figure shows a top view of the portable vehicle of this embodiment. In this embodiment, the distance d between the two third support rods 1113 is l The distance d2 between the two first support rods 1102 is shorter than that between the two first support rods 1102, so that the projections of the first support rod and the third support rod on the plane do not overlap, presenting a "staggered" state. With such a design, when the portable vehicle is in a folded state, the first support rod bends inwards to form a positive "V" shape, and the third support rod bends upwards to form an inverted "V" shape. The first and third support rods are staggered in the width direction of the portable vehicle, avoiding mutual interference and improving space utilization. As an optional embodiment, the distance d2 between the two third support rods 1113 is l The distance d2 between the two first support rods 1102 is longer than that between the two first support rods 1102. With such an arrangement, the bottom accommodation space of the portable vehicle can be expanded.

[0077] As another optional embodiment of the side folding structure, Figure 7 As shown, the first support rod and the third support rod are composed of support sections of different lengths. The first support rod is a support section 1701 with a longer length at the left position in the figure, and a support section 1702 with a shorter length at the right position in the figure. The two support sections are connected by an axle 1703; the support section of the third support rod is a support section 1704 with a shorter length at the left position in the figure, and a support section 1705 with a longer length at the right position in the figure. The two support sections are connected by a rotating connector 1706. With such a design, the support rods of the upper frame and the lower frame can present a "staggered" posture in the folded state, avoiding mutual interference, and making the folded state of the portable vehicle more compact. In this embodiment, the ratio range of the difference between the length of a longer support section and the length of a shorter support section to the length of the longer support section is defined as the "length deviation ratio", and the lower limit of the length deviation ratio in this embodiment includes 5%, 10%, and 15%. When the length deviation ratio of the long and short support segments is above these lower limits, it is ensured that the support segments can present a mutually "interlaced" posture in the folded state, so as to achieve a compact folding structure. The upper limits of the length deviation ratio of the support segments of this embodiment include 20%, 25%, and 30%. When the length deviation values ​​of the long and short support segments are below these upper limits, the rotation angles of the two support segments of the long and short designs in the folded state are larger, and the larger rotation angle corresponds to a shorter lateral distance, further improving the folding compactness of the portable vehicle. For example, for the first support rod with a total length of 100 cm, the length of the shaft rod is 5 cm, and the lengths of the support segments 1701 and 1702 are 47 cm and 38 cm respectively, and the "length deviation ratio" thereof is (47-38) / 47*100%≈19.1%.

[0078] Second Class Embodiment

[0079] like Figure 8 The second embodiment of the present invention is shown in the figure. The portable vehicle 20 includes a frame assembly, a front handle assembly, a rear handle assembly, a chassis assembly, and a wheel assembly. The frame assembly includes an upper frame and a longitudinal support rod 2108. The longitudinal support rod 2108 is arranged between the chassis assembly and the upper frame, and is used to connect the upper frame and the chassis assembly. The upper frame includes a first support rod arranged in the length direction and a second support rod in the width direction. The first support rod includes at least two first support sections 2102 and 2104, and the second support rod includes two second support sections. The first support rod and the second support rod are connected by an upper corner coupling 2001 to form a rectangular frame. In this embodiment, the bottom of the portable vehicle includes a fourth support rod arranged in a transverse direction. As an optional embodiment, the bottom of the portable vehicle does not include support rods in the length direction and the width direction.

[0080] The rear handle assembly 230 is arranged at the rear of the portable vehicle. The main function of the rear handle assembly is to provide thrust, and it is suitable for pushing the camping vehicle. The rear handle assembly 230 includes a lower handle 2301 and an upper handle 2302. The upper and lower handles are connected by a rotating connector 2303, and the upper and lower handles can rotate around the rotating connector 2303, so as to provide a comfortable operating angle for the operator. The upper handle 2302 includes two handle sections, and the two handle sections are rotatably connected by a rotating connector 2304. The rotating connector 2304 enables the two handle sections of the upper handle to be folded in a "V" shape, thereby reducing the folding volume of the portable vehicle.

[0081] The two first support sections 2102, 2104 of the first support rod are connected by an axle 2107. When the portable vehicle is in the unfolded state, the first support sections 2102, 2104 are folded outward until the two support sections are substantially in a straight line, and the effective area of ​​the frame of the entire portable vehicle in the unfolded state is maximized.

[0082] The first support rod also includes a support reinforcement member. In this embodiment, the support reinforcement member is a limit rod 2103, which is rotatably connected to any one of the two first support sections, and a limit slot 2111 is set in the other support section. In this embodiment, the limit rod 2103 is rotatably connected to the first support section 2102, and the limit rod 2013 can rotate in a plane that is vertical or substantially vertical to the bottom surface of the portable vehicle. As an optional embodiment, the limit rod can also rotate in a plane that is parallel or substantially parallel to the bottom surface of the portable vehicle. A limit buckle 2106 is set at the other end of the limit rod, and when the portable vehicle is in the unfolded state, the limit rod 2103 is clamped in the first limit slot 2111 of the support section 2102 through the limit buckle 2106. At this time, the limit rod 2103 spans the two first support sections 2102 and 2104, and provides support force to the two support sections at the same time, thereby ensuring that the two first support sections can maintain a substantially straight state in the unfolded state. At the same time, since the limiting rod 2103 itself has a certain strength, such a configuration can improve the load-bearing capacity of the first support rod in the unfolded state.

[0083] like Fig. 9 Another embodiment of the limit rod is shown. In this embodiment, the first support rod includes two end support sections 3102 and 3104. In addition to the limit buckle 3106 and the first limit slot 3111, the first support section 3104 is also provided with a second limit slot 3112. When the portable vehicle is in the unfolded state, the limit buckle 3106 of the limit rod 3103 is inserted into the first limit slot 3111 to keep the portable vehicle in the unfolded state. Fig.10As shown, when the portable vehicle is in a folded state, the limit buckle 3106 of the limit rod 3103 is inserted into the second limit slot 3112, so that the portable vehicle remains in a folded state. By respectively setting the first limit slot 3111 and the second limit slot 3112, the portable vehicle can remain in both an unfolded state and a folded state, which solves the problem that the existing portable vehicle needs to be fixed by a buckle rope or a cloth cover in a folded state, prevents the loss of the buckle rope or the cloth cover, and improves the convenience of using the portable vehicle. When the limit rod 3103 is used as the first support rod reinforcement device, the support sleeve 3105 can also be used as a reinforcement device at the same time, which further increases the strength of the first support rod in the unfolded state.

[0084] like Figure 8 As shown, the chassis assembly of the portable vehicle includes a base 2401, the base 2401 has a base extension, the base extension extends to the four diagonal angles of the portable vehicle frame, one end of the base rod 2402 is rotatably connected to the base, and the other end of the base rod 2402 is rotatably connected to the lower corner coupling 2002 and / or the longitudinal support rod. By providing the base extension, when the portable vehicle is in the unfolded state, the base rod is supported by the base extension, which reduces the force arm of the base rod, so that the base rod can bear a greater weight, avoids further downward movement or deformation of the base, improves the structural stability of the chassis assembly, and thus improves the structural stability of the entire portable vehicle.

[0085] The chassis assembly also includes a bottom support device, which includes a fixed seat 2410 and a traction member. In this embodiment, the traction member includes a first pull rod 2411 and a second pull rod 2412. The fixed seat 2410 is connected to the base 2401 and can move with the movement of the base. The connection between the fixed seat 2410 and the base can be a fixed connection or an elastic connection, as long as the connection enables the fixed seat to apply a force to the base and can move with the base. As an optional embodiment, the fixed seat and the base are integrally formed.

[0086] The base also includes a bottom support device, which includes a fixed seat 2410 and a traction member, and the traction member is arranged between the base (or fixed seat) and the base rod and / or the lower corner coupling member. In this embodiment, the traction member includes a first pull rod 2411 and a second pull rod 2412. The fixed seat 2410 is connected to the base 2401 and can move with the movement of the base. The connection between the fixed seat 2410 and the base can be a fixed connection or an elastic connection, as long as the connection can enable the fixed seat to apply a force to the base and can move with the base. As an optional embodiment, the fixed seat and the base are integrally formed, and in this case, the fixed seat and the base are the same component. The function of the fixed seat of this embodiment includes making the traction member have a certain distance between the installation position of the base and the base rod, and making the traction member have a certain angle with the horizontal direction, so as to increase the force component of the traction member on the base. For example, when the base or the base rod has a certain thickness, the fixed seat can be not provided, and the traction member can be directly installed between the base and the base rod.

[0087] One end of the first pull rod 2411 is rotatably connected to the second pull rod 2412, and the other end of the first pull rod 2411 is rotatably connected to the fixing seat 2410 through a first fixed shaft (not shown), and one end of the second pull rod 2412 is rotatably connected to the support connector 2416 through a second fixed shaft (not shown). The support connector 2416 is mounted to the base rod 2402 and can move with the base rod 2402, and the support connector 2416 can provide support to the base rod 2402. As an optional embodiment, the support connector 2416 and the base rod 2402 can be displaced within a certain range, and this displacement can provide more space for the folding of the traction member, thereby increasing the folding smoothness of the entire portable vehicle. At the same time, since the displacement between the support connector and the base rod is limited within a certain range, the traction member can still provide a force to the base rod through the support connector 2416.

[0088] like Figure 8As shown, the first pull rod 2411 and the second pull rod 2412 are connected by a rotating connection member 2414. As an embodiment, the rotating connection member has a first rotating connection part and a second rotating connection part. A certain distance is set between the two rotating connection parts. The first pull rod and the second pull rod are respectively connected by the rotating connection parts set on the rotating connection member 2414, so that the first pull rod and the second pull rod can rotate around the rotating connection member 2414 to achieve relative rotation. The relative distance between the first rotating connection part and the fixed seat 2410 remains unchanged, and the relative distance between the first rotating connection part and the base remains unchanged; the relative distance between the second rotating connection part and the supporting connection member 2416 remains unchanged, and the relative distance between the second rotating connection part and the base rod 2402 remains unchanged. When the portable vehicle switches between the unfolded state and the folded state, the straight-line distance between the fixed seat 2410 and the supporting connection member 2416 undergoes a process of changing from far to near, and the first pull rod 2411 and the second pull rod 2412 are both rigid structures and are difficult to fold themselves. By providing the rotating connector 2414, the distance between the two end points of the rigid first pull rod 2411, the second pull rod 2412 and the fixed seat and the base rod can be changed as the portable vehicle is folded and unfolded, making it possible to fold the traction member in this embodiment, thereby realizing the folding and unfolding of the bottom support device. As an optional embodiment, in this embodiment, the support connector 2416 is integrally formed with the base rod. As another optional embodiment, the rotating connector connecting the first pull rod and the second pull rod is a rotating shaft.

[0089] As an optional embodiment, the traction member is a rigid rod, and the connection between the traction member and the base and / or the fixed seat and / or the base rod adopts a sliding connection, that is, the installation part of the traction member and the above structure can slide along the above structure, thereby changing the distance between the installation parts of the traction member, so that the base frame can be folded smoothly. When the traction member is a rigid rod, the force applied by the traction member to the base can be a pulling force or a pushing force.

[0090] When the portable vehicle is in the unfolded state and a heavy object is placed inside the vehicle, the base 2401 tends to move downward under the gravity of the heavy object, causing a "depression" inside the portable vehicle. The larger the "depression", the weaker the load-bearing capacity of the portable vehicle. In other words, the ability of the chassis assembly to withstand a heavy object without causing a depression corresponds to the load-bearing capacity of the portable vehicle. By providing a bottom support device, when the base 2401 tends to move downward, the first pull rod 2411 and the second pull rod 2412 can provide a pulling force to the fixed seat 2410. The vertical upward component of this pulling force is transmitted to the base 2401, preventing the base 2401 from moving downward, avoiding the depression of the chassis assembly, and improving the structural stability of the chassis assembly, thereby improving the load-bearing capacity of the portable vehicle.

[0091] like Fig.11 Another embodiment of the bottom support device of the present invention is shown. The bottom frame assembly 440 includes a base 4401 and a base rod 4402 rotatably connected to the base. The bottom frame assembly 440 also includes a bottom support device, which includes a fixed seat 4410 and a traction member 4411. The fixed seat 4410 is installed on the base 4401 and can move with the base. The fixed seat 4410 can also provide an interaction force to the base 4401. As an optional embodiment, the fixed seat and the base are integrally formed. The support connector 4412 is installed on the base rod 4402 and can move with the base rod 4402. The support connector 4412 can provide an interaction force to the base rod 4402. As an optional embodiment, the support connector and the base rod are integrally formed. The traction member 4411 is arranged between the fixed seat 4410 and the support connector 4412. In this embodiment, the traction member 4411 is an elastic pull rope, which produces elastic deformation when subjected to tension, and the elastic pull rope can restore its original length after the tension is removed. The greater the elastic deformation of the elastic pull rope, the greater the elastic tension it generates. One end of the traction member 4411 is connected to the fixed seat 4410, and the other end is connected to the support connector 4412. The traction member 4411 provides tension to the fixed seat 4410 and the support connector 4412 respectively, wherein the tension provided by the traction member 4411 to the fixed seat 4410 has an upward component, which offsets or partially offsets the gravity borne by the base 4401, thereby preventing the base 4401 from moving downward and causing a depression. Through such an arrangement, when the portable vehicle is in the unfolded state, the distance between the support connector 4412 and the fixed seat 4410 is the largest, and the elastic deformation of the traction member 4411 is the largest, which means that the traction member 4411 provides the largest tension to the fixed seat, further improving the load-bearing capacity of the chassis assembly. In addition, since the elastic drawstring has a certain degree of deformation ability, it can play a shock-absorbing role. When transporting fragile items, precision instruments and other goods, this shock-absorbing effect can effectively protect the goods placed in the portable vehicle.

[0092] As an optional embodiment, the traction member can also be a steel wire rope or other rigid pull rope with no elasticity or weak elasticity. The length of the rigid pull rope is not greater than the distance between the supporting connector and the fixed seat in the unfolded state. At this time, the traction member has a certain structural strength and is difficult to be broken, so that it can effectively provide traction to the base. At the same time, because the traction member does not produce or is difficult to produce elastic deformation, the traction member will only generate interaction force between the fixed seat and the base rod when there is cargo placed in the portable vehicle. In contrast, if the traction member is an elastic pull rope, when the portable vehicle is in the unfolded state, even if the portable vehicle does not carry cargo, the elastic pull rope may continue to provide traction to the base, causing the portable vehicle to have a tendency to fold inward and cannot maintain the folded state, affecting some user experiences.

[0093] As another optional implementation, when the traction member is an elastic drawstring, the length of the elastic drawstring that does not produce elastic deformation is defined as the elastic drawstring length, and the distance from the fixed seat to the supporting connector is defined as the unfolding distance (specifically, the distance between the connection part between the fixed seat and the elastic drawstring and the connection part between the supporting connector and the elastic drawstring). In this embodiment, the length of the elastic drawstring is less than or equal to the unfolding distance. Through such a setting, when the portable vehicle is loaded with goods, regardless of the weight of the goods, the elastic drawstring can produce elastic deformation and provide traction to the fixed seat. At the same time, the lower limit of the ratio between the length of the elastic drawstring and the unfolding distance is set to 70%, preferably 80%, and more preferably 90%. By controlling the elastic deformation of the elastic drawstring in the unfolded state, the traction generated by the elastic drawstring in the empty state is reduced, and the tendency of the portable vehicle to fold inward is reduced.

[0094] like Fig.12The figure shows another schematic diagram of another embodiment of a support reinforcement member of the present invention. When the portable vehicle is in the unfolded state, the support reinforcement member is used to keep the two adjacent support sections 4102 and 4104 in a straight line and share part of the gravity borne by the support rod. The support reinforcement member is a bolt rod 4106, and the support sections 4102 and 4104 are provided with bolt buckles 4105, 4108, and 4109. In this embodiment, the bolt buckles 4105 and 4108 are provided on the support section 4102, and the bolt buckle 4109 is provided on the support section 4104. In addition, the support section 4102 is also provided with a first protrusion 4111 and a second protrusion 4112. A bolt tongue 4110 is fixedly connected to the bolt rod 4106. The bolt rod 4106 can move in the space formed between the bolt buckles 4105, 4108, and 4109 and the support section, so that the support reinforcement member can be switched between a locked state and an open state. When the portable vehicle is in the unfolded state, the tie rod 4106 passes through the tie buckles 4108 and 4109 to cross the adjacent support sections 4102 and 4104, and the tie tongue 4110 is buckled into the first protrusion 4111. At this time, due to the limitation of the tie rod, the tie buckle and the tie tongue, the support sections 4102 and 4104 are in contact with the tie rod 4106 and exert interaction force, so that the support sections 4102 and 4104 cannot rotate relative to each other, thereby improving the stability of the support rod in the unfolded state and increasing the load-bearing capacity. Furthermore, since the latches 4108 and 4109 are at a certain distance from the ends of their respective support sections, the latches 4108 and 4109 can be regarded as the fulcrums of the support sections where they are located. Compared with the technical solution of internal position limiting of the rotating connecting member used in the prior art, the torque obtained by multiplying the force applied by the supporting reinforcement member on the support section by the distance between the force and the latch is further reduced, thereby improving the stability of the latches 4108 and 4109 and further improving the load-bearing capacity of the upper frame support rod. When the portable vehicle is about to be folded or is in a folded state, the latch rod 4106 passes through the two latches 4105 and 4108 set on the support section 4102 respectively, and does not pass through the latch 4109 set on the support section 4104, and the latch tongue 4110 is buckled into the second protrusion 411. At this time, the latch rod is stored in the first support section, and the support sections 4102 and 4104 can rotate freely along the shaft 4107, thereby realizing the folding of the upper frame support rod.

[0095] As another optional implementation, the first support rod adopts a hollow support section, and the bolt rod is arranged inside the support section to improve the simplicity of the structure.

[0096] The third embodiment

[0097] like Fig.13 , 14Another embodiment of the present invention is shown. The portable vehicle 50 includes a frame assembly, a handle assembly, a chassis assembly, and a wheel assembly. The frame assembly includes an upper frame and a longitudinal support rod, and the longitudinal support rod is connected to the upper frame. The upper frame includes a first support rod in the length direction and a second support rod in the width direction, the first support rod includes at least two first support sections, and the second support rod includes at least two second support sections. The first support rod and the second support rod are connected by an upper corner coupling to form a rectangular frame.

[0098] In this embodiment, the second support rod can be extended and retracted along the direction in which the second support rod extends, thereby changing the overall length of the second support rod. In this embodiment, the second support rod has two second support sections, each of which includes an outer rod 5105 and an inner rod 5106. The outer rod has a hollow structure, and the inner rod is disposed in the hollow structure of the outer rod and can move along the outer rod. Fig.14 The figure shows a detailed view of the second support section of the present embodiment. In the present embodiment, a plurality of elastic buckles 5108 are arranged on the inner rod, and a limited clamping hole 5107 is arranged on the outer rod. When the inner rod moves along the hollow structure of the outer rod, when the elastic buckle arranged on the inner rod corresponds to the limited clamping hole on the outer rod, the elastic buckle on the inner rod cooperates with the limited clamping hole on the outer rod to limit the inner rod. When the relative position of the inner rod and the outer rod needs to be changed, the elastic buckle on the inner rod is pressed. At this time, since there is no longer a limited relationship between the inner rod and the outer rod, the inner rod can move freely along the hollow structure of the outer rod, so that the second support section can be switched between the extended state and the contracted state. By arranging a plurality of elastic buckles on the inner rod, in actual operation, it is only necessary to block the limited clamping hole on the outer rod to prevent the elastic buckle on the inner rod from popping out, so that the inner rod can be easily slid in the hollow structure of the outer rod, thereby improving the convenience of adjusting the telescopic length of the second support section.

[0099] like Fig.15Another embodiment of the retractable second support section of the present invention is shown. In this embodiment, the second support section includes an outer rod 6105 and an inner rod 6106. The outer rod has a hollow structure, and the inner rod is arranged in the hollow structure of the outer rod and can move along the outer rod. A plurality of slots 6108 are arranged on the inner rod, and a buckle 6109 is arranged on the outer rod. The buckle arranged on the outer rod can switch between a locked state and a released state. When the slot on the inner rod corresponds to the buckle position on the outer rod, the buckle is placed in a locked state by pressing or rotating the buckle arranged on the outer rod. At this time, the buckle protrudes toward the direction of the inner rod, and the protruding buckle cooperates with the slot on the inner rod and limits the position, so that the relative position of the inner rod and the outer rod remains fixed. When the relative position of the inner rod and the outer rod needs to be changed, the buckle provided on the outer rod is pressed or rotated to put it in a disengaged state. In the disengaged state, the buckle provided on the outer rod and the slot provided on the inner rod no longer have a limiting relationship, and the inner rod can move freely along the hollow structure of the outer rod, so that the second support section can switch between an extended state and a contracted state. Compared with the technical solution of providing an elastic buckle on the inner rod, only providing a buckle on the outer rod that can switch between a locked state and a disengaged state reduces the complexity of the telescopic structure of the support rod, reduces costs, and improves the reliability of the telescopic structure of the second support section. As other implementation forms of the telescopic limit device, the state of the telescopic support rod can also be locked or fixed by tightening screws to provide friction.

[0100] As another optional embodiment, the second support section includes an outer rod and an inner rod, the outer rod has a hollow structure, and the inner rod is arranged in the hollow structure of the outer rod and can move along the outer rod. The outer surface of the inner rod is in contact with the inner surface of the outer rod and there is friction, and the friction limits the relative position between the inner rod and the outer rod. When the second support section is in an extended or contracted state, the relative position of the inner rod and the outer rod will not change easily. The relative position of the outer rod and the inner rod is limited by friction, which further reduces the complexity of the telescopic structure and improves the reliability of the system.

[0101] At the same time, if Fig.16As shown, the lower corner coupling 6002 is provided with a receiving groove for accommodating the longitudinal support rod, and the longitudinal support rod 6104 is connected to the lower corner coupling through the receiving groove and then connected to the lower frame and the bottom frame. The receiving groove of the longitudinal support rod is provided with an axial hole (not shown in the figure), and the longitudinal support rod is connected to the lower corner coupling 6002 through a rotating shaft, so that it can rotate around the rotating shaft and form a certain rotation angle relative to the lower corner coupling 6002 and the lower frame. The receiving groove of the lower corner coupling 6002 for accommodating the longitudinal support rod is opened outward, which can limit the rotation direction of the longitudinal support rod to only outward and not inward. The longitudinal support rod receiving groove of the lower corner coupling 6002 is provided with a limiting structure 6005, and the limiting structure 6005 is arranged outside the receiving groove, which can limit the rotation angle of the longitudinal support rod to between 0 and 30°. Optionally, when the lower corner coupling member provides a limit, the telescopic structure of the second support rod may not provide a telescopic state locking structure such as a buckle or a hole, and the limit structure of the corner coupling member may be directly used to limit the degree of exposure.

[0102] As another optional embodiment, the limiting structure of the longitudinal support rod accommodating groove of the corner coupling is arranged in the horizontal direction (not shown in the figure), which is used to "lift" the longitudinal support rod upward when the longitudinal support rod is extended outward until it is horizontal. In this case, the rotation angle of the longitudinal support rod can reach 90°, so that the side frame of the portable vehicle can be fully unfolded to form a larger loading platform for use as a flatbed vehicle. Correspondingly, the second support rod is detachably connected to the upper corner coupling. When the portable vehicle needs to be unfolded, the connection between the second support rod and the upper corner coupling is disconnected, so that the longitudinal support rod can rotate within the range of 0° to 90°. The locking devices 5009 and 6009 are used to fix or disconnect the second support rod and the upper corner coupling.

[0103] Optionally, the longitudinal support rod includes at least two sections of a sleeved structure, which can be extended and retracted up and down to change the height of the portable vehicle, thereby increasing or reducing the volume of the storage space surrounded by the portable vehicle frame. When the longitudinal support rod of the portable vehicle can be extended and retracted up and down and the second support rod can be extended or shortened, the frame of the portable vehicle has the functions of "opening" and "growing in height" at the same time. When facing a larger volume of cargo, the size of the objects that the portable vehicle can accommodate is increased, thereby improving the usability of the portable vehicle.

[0104] like Fig.17Another embodiment of the present invention is shown. The portable vehicle 70 includes a frame assembly 710, a handle assembly 720, a bottom frame assembly 740, and a wheel assembly 750. The frame assembly 710 includes an upper frame and a longitudinal support rod 7108, and the longitudinal support rod is connected to the upper frame. The upper frame includes a first support rod in the length direction and a second support rod in the width direction. A lower corner coupling member 7002 is provided between the bottom frame assembly 740 and the frame assembly 710, and the frame assembly 710 is connected to the bottom frame assembly 740 through the lower corner coupling member 7002.

[0105] like Fig.18 The figure shows the assembly schematic diagram of the lower corner coupling member and the longitudinal support rod. The lower corner coupling member 7002 is provided with a plurality of accommodating grooves for accommodating different components. In this embodiment, the lower corner coupling member 7002 is provided with a longitudinal accommodating groove and a horizontal accommodating groove, the longitudinal accommodating groove is used to accommodate the longitudinal support rod, and the horizontal accommodating groove is used to accommodate the support rods in various horizontal directions including the base rod. As for the longitudinal accommodating groove for accommodating the longitudinal support rod, the space size formed by it is larger than the size of the lower end of the longitudinal support rod, so that the longitudinal support rod can be accommodated. The wall of the longitudinal accommodating groove is provided with an axial hole, and the lower end of the longitudinal support rod is also provided with an axial hole 7004 correspondingly. The locking shaft 7110 of the longitudinal support rod 7108 simultaneously passes through the axial holes on the two side walls of the accommodating groove and the axial hole 7005 provided on the lower end of the longitudinal support rod, so that the longitudinal support rod is connected to the lower corner coupling member 7002 and then the frame assembly and the bottom frame assembly are connected, forming a accommodating space in the general state of a portable vehicle. In this embodiment, the locking shaft includes a locking portion 7109, which can switch the locking shaft between a locked state and a released state. Specifically, a limiting protrusion 7006 is provided at the end of the locking portion, and a limiting protrusion 7007 is provided at the corresponding position of the lower corner coupling 7002. When the locking portion is in the locked state, the locking shaft 7110 is limited in the y direction by the limiting protrusion and the limiting groove, and cannot move along the y direction. At the same time, the locking shaft itself is limited by the shaft hole of the lower corner coupling and cannot move in the x direction. Therefore, when the lock is in the locked state, the locking shaft cannot move relative to the lower corner coupling. When the lock is in the open state, the limit of the locking shaft in the y direction is cancelled, and the locking shaft can move along the y direction and disengage from the shaft hole of the lower corner coupling. At this time, the longitudinal support rod can be disengaged from the lower corner coupling and disengaged together with the upper frame. In this embodiment, the lengths of the four longitudinal support rods are the same. When the four longitudinal support rods are placed on a plane as table legs, the longitudinal support rods can support the upper frame and keep the upper frame horizontal. The flat plate portion 7801 can be installed on the upper frame to form a mobile table, which can be used to place tableware, food, drinks, board games and other objects in outdoor occasions such as camping and picnics, thereby expanding the application scenarios of the portable vehicle and improving the usability of the portable vehicle of the present invention.

[0106] The support reinforcement between the two support sections of the first support rod of this embodiment adopts a bolt rod and a buckle structure. When the portable vehicle is in the unfolded state, the bolt rod passes through the buckles set on the two adjacent support sections respectively, so that the first support rod remains in the unfolded state and the load-bearing capacity of the first support rod is improved. The flat plate portion includes two flat plate buckles (not shown in the figure) arranged below the flat plate portion. When the flat plate portion is placed on the upper frame, the two flat plate buckles are staggered with the buckles set on the second support section and "clamp" the buckles set on the second support section, and the two flat plate buckles correspond to the holes of the buckles on the second support section, so that the bolt rod can pass through the flat plate buckles and the buckles set on the second support section at the same time. At this time, due to the limiting effect of the two flat plate buckles on the buckles on the second support section, the flat plate portion and the first support rod cannot move relative to each other in the length direction of the first support rod. At the same time, due to the limiting effect of the bolt rod, the flat plate portion and the first support rod cannot move relative to each other in the direction perpendicular to the first support rod. In this case, the flat plate portion and the frame assembly of the portable vehicle are fixed to each other, which improves the stability of the mobile table structure and makes the position transfer of the mobile table more convenient.

[0107] As an optional embodiment, a Velcro is provided at the bottom of the flat plate portion 7801, and when the flat plate portion is placed on the upper frame, the Velcro is used to fix the relative position between the flat plate portion and the first support rod and / or the second support rod. As other optional embodiments, the flat plate portion and the upper frame may also be fixed by other detachable connection methods such as snap connection, threaded screw connection, etc.

[0108] like Fig.19 As shown, the flat plate portion 7801 includes more than two folding plates and nylon cloth sleeves sleeved on each folding plate, and the nylon cloth sleeve forms a storage space according to the shape and number of the folding plates, and the folding plates are placed in the storage space. Since the nylon cloth sleeve is soft in texture, the folding plates sleeved in the nylon cloth sleeve can switch between an open state and a folded state. When the folding plates are in an open state and placed on the upper frame, the folding plates can be in an open state under the support of the upper frame.

[0109] like Fig. 20 As shown, the flat plate portion 7801 of this embodiment can also be arranged on the bottom frame assembly 740. When the flat plate portion is arranged on the bottom frame assembly, the portable vehicle can be used as a flatbed trailer. In this case, the portable vehicle can carry objects with a larger length and width, thereby improving the carrying capacity of the portable vehicle. As another expansion method, the components arranged on the bottom frame assembly 740 can also be storage boxes, water tanks, mobile equipment, etc., further expanding the application scenarios of the portable vehicle.

[0110] The present invention is not limited to the specific structure and arrangement shown. As long as a similar technical solution to the present invention is adopted and a similar effect can be achieved, it should be considered to belong to the protection scope of the present invention.

Claims

1. A portable vehicle with a bottom reinforcement structure, comprising: A bottom frame assembly for providing bottom support; A frame assembly, used to form a receiving space of the portable vehicle, the chassis assembly and the frame assembly being connected via a lower corner coupling; a handle assembly for providing driving force to the chassis assembly and / or the frame assembly; A wheel assembly, used to support the chassis assembly and / or the frame assembly and drive the chassis assembly and / or the frame assembly to move; The base frame assembly includes a base and a base rod, and the base rod is rotatably connected to the base; The base has a base reinforcement structure, and the base reinforcement structure is used to provide support force for the base and / or the base rod.

2. The portable vehicle according to claim 1, characterized in that: The base reinforcement structure is a base extension, and the base extension extends toward four diagonal corners of the chassis assembly; The base extension portion is provided with a base rod mounting groove, the base rod mounting groove is provided with a base rod mounting hole, and the base rod is rotatably connected to the base through the base rod mounting hole; The bottom of the base rod installation slot is open and the top is closed, so as to limit the base rod from rotating upward around the base rod installation hole.

3. The portable vehicle according to claim 2, characterized in that: The ratio of the diagonal length of the base extension portion to the diagonal length of the base frame assembly is in a range of 10% to 35%.

4. The portable vehicle according to claim 3, characterized in that: The distance between the mounting holes of the two oppositely disposed base rods is less than half of the diagonal length of the base extension portion.

5. The portable vehicle according to claim 1, characterized in that: The base reinforcement structure includes a traction member, one end of which is mounted to the base, and the other end of which is mounted to the base rod and / or the lower corner coupling member; In the deployed state, the traction member provides a pulling force or a pushing force having an upward component to the base.

6. The portable vehicle according to claim 5, characterized in that: The base also includes: A fixing seat, the fixing seat is connected to the base and can apply a force to the base; One end of the pulling member is connected to the fixing seat, and the other end of the pulling member is mounted to the base rod and / or the lower corner coupling member.

7. The portable vehicle according to claim 6, characterized in that: The traction member includes a first pull rod and a second pull rod, one end of the first pull rod is rotatably connected to the fixed seat, the other end of the first pull rod is connected to one end of the second pull rod through a rotating connecting member, and the other end of the second pull rod is rotatably connected to the supporting connecting member.

8. The portable vehicle according to claim 7, characterized in that: The rotating connection member includes at least two rotating connection parts, and there is a certain distance between the at least two rotating connection parts.

9. The portable vehicle according to any one of claims 5 to 6, characterized in that: The traction member is a rigid traction rope; One end of the rigid traction rope is connected to the base, and the other end of the rigid traction rope is connected to the base rod and / or the lower corner coupling; The length of the rigid traction rope is equal to or less than the distance between two mounting locations on the base, base rod and / or lower corner coupling for connecting the rigid traction rope in the unfolded state.

10. The portable vehicle according to any one of claims 5 to 6, characterized in that: The traction member is an elastic rope; One end of the elastic cord is connected to the base, and the other end of the elastic cord is connected to the base rod and / or the lower corner coupling; The length of the elastic cord in the non-elastically deformed state is greater than 70% of the distance between two mounting locations on the base, base rod and / or lower corner coupling for connecting the elastic cord in the unfolded state.

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