Portable vehicle

Abstract

The invention relates to a portable vehicle, in particular to a portable vehicle capable of being switched between an unfolded state and a folded state, which comprises a chassis assembly for providing bottom support; the frame assembly is used for forming a containing space of the portable vehicle; the handle assembly is used for providing driving force for the underframe assembly and / or the frame assembly; and 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 portable vehicle is light in weight, low in cost, small in occupied space when folded and high in expandability.

Description

[0001] This application is a divisional application of an invention patent with the application number "CN202280005033.8", the application date "November 24, 2022", and the title "Portable Vehicle". Technical Field

[0002] The present invention generally relates to portable vehicles including wheelbarrows, hand trailers, camp carts, camping trailers, beach carts, and more specifically to a small portable vehicle that can switch between an unfolded state and a folded state and is generally driven by human power (it can also be driven by electricity or other energy sources). Background Art

[0003] In occasions of outdoor activities such as camping, picnic, beach parties, and in some household handling situations, there is a need for a vehicle to carry large-volume and heavy goods at one time. Summary of the Invention

[0004] To solve the problem that the bottom load-bearing strength of existing portable vehicles is not high, the purpose of the present invention is to provide a portable vehicle.

[0005] The technical solution provided by the present invention is as follows:

[0006] A portable vehicle, comprising:

[0007] A chassis assembly for providing bottom support;

[0008] A frame assembly for forming the accommodation space of the portable vehicle;

[0009] A handle assembly for providing driving force to the chassis assembly and / or the frame assembly;

[0010] 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;

[0011] The chassis assembly includes a base and a base rod; the base has a base extension; one end of the base rod is rotatably connected to the base, and the other end of the base rod is rotatably connected to a lower corner coupling member and / or a longitudinal support rod in the frame assembly;

[0012] The chassis assembly further includes a bottom support device, and the bottom support device includes a fixed seat and a traction member; the fixed seat is connected to the base; the traction member is connected to the fixed seat and can move with the base rod, and the traction member provides a force to the base rod.

[0013] As a preferred technical solution, in the unfolded state, the traction member provides a first traction force to the fixed seat; in the folded state, the traction member provides a second traction force to the fixed seat, and the second traction force is less than the first traction force.

[0014] Optionally, the second traction force is equal to zero.

[0015] As a preferred technical solution, the fixing seat can move with the base to apply a force to the base; the fixing seat and the base are integrally formed.

[0016] As a preferred technical solution, a support connecting member is provided on the base rod, and the support connecting member can move with the base rod; the support connecting member is fixedly arranged relative to the base rod or can generate displacement; the other end of the traction member is connected to the support connecting member, and the traction member provides a force to the base rod through the support connecting member.

[0017] Optionally, the support connecting member and the base rod are integrally formed.

[0018] Optionally, 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 fixing seat, and the other end of the first pull rod is rotatably connected to the second pull rod; one end of the second pull rod is rotatably connected to the support connecting member.

[0019] Optionally, 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 support connecting member; the ratio of the length of the elastic rope to the deployment distance is 70% - 100%;

[0020] Or,

[0021] The traction member is a rigid rope; one end of the rigid rope is connected to the base, and the other end of the rigid rope is connected to the support connecting member.

[0022] As a preferred technical solution, the base extension extends towards the four diagonals of the chassis assembly;

[0023] The base extension is provided with a base rod installation groove, and the base rod installation groove is provided with a base rod installation hole. The base rod is rotatably connected to the base through the base rod installation hole;

[0024] The lower part of the base rod installation groove is open while the upper part is closed to limit the upward rotation of the base rod around the base rod installation hole.

[0025] Optionally, the ratio range of the diagonal length of the base extension to the diagonal length of the chassis assembly is 10% - 35%.

[0026] The above summary of the invention does not include an exhaustive listing of all aspects of the present 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 outlined above, as well as those aspects disclosed in the detailed description below and particularly pointed out in the claims filed with this patent application. Such combinations have specific advantages not specifically set forth in the above summary of the invention.

[0027] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects:

[0028] By providing a bottom support device in the present invention, when the base has a tendency to move downward, the traction member can provide a pulling force to the fixed seat, and the vertically upward component of this pulling force is transmitted to the base to prevent the base from moving downward, avoiding the depression of the chassis assembly, improving the structural stability of the chassis assembly, and further improving the load-bearing capacity of the portable vehicle.

[0029] In addition, by providing a base extension, when the portable vehicle is in the unfolded state, the base rod is supported by the base extension, reducing the force arm of the base rod, enabling the base rod to bear a greater weight, preventing the base from moving further downward, improving the structural stability of the chassis assembly, and further improving the structural stability of the entire portable vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like reference numerals indicate like elements. It should be noted that embodiments referred to as "a" or "an" in this disclosure are not necessarily the same embodiment.

[0031] Figure 1 A schematic diagram of a portable vehicle according to a first type of embodiment of the present invention in the unfolded state is shown;

[0032] Figure 2 A schematic diagram of a portable vehicle according to a first type of embodiment of the present invention in the folded state is shown;

[0033] Figure 3 A schematic diagram of the bottom structure of a portable vehicle according to a first type of embodiment of the present invention is shown;

[0034] Figure 4 A schematic diagram of the corner coupling structure of a portable vehicle according to a first type of embodiment of the present invention is shown;

[0035] Figure 5 A schematic diagram of another perspective of the corner coupling of a portable vehicle according to a first type of embodiment of the present invention is shown;

[0036] Figure 6Shows a schematic structural diagram of a portable vehicle from a top-down perspective for the first type of embodiments of the present invention;

[0037] Figure 7 Shows a schematic structural diagram of a portable vehicle frame for the first type of embodiments of the present invention;

[0038] Figure 8 Shows a schematic diagram of a portable vehicle in an unfolded state for the second type of embodiments of the present invention;

[0039] Figure 9 Shows a detailed structural diagram of a support rod of a portable vehicle for the second type of embodiments of the present invention;

[0040] Figure 10 Shows a schematic diagram of a portable vehicle in a folded state for the second type of embodiments of the present invention;

[0041] Figure 11 Shows a schematic structural diagram of the bottom of a portable vehicle for the second type of embodiments of the present invention;

[0042] Figure 12 Shows a detailed structural diagram of a support rod of a portable vehicle for the second type of embodiments of the present invention;

[0043] Figure 13 Shows a schematic diagram of a portable vehicle in an unfolded state for the third type of embodiments of the present invention;

[0044] Figure 14 Shows schematic diagrams of partial detailed structures of a support rod of a portable vehicle for the third type of embodiments of the present invention from different perspectives;

[0045] Figure 15 Shows schematic diagrams of partial detailed structures of a support rod of a portable vehicle for the third type of embodiments of the present invention from different perspectives;

[0046] Figure 16 Shows Figure 13 A schematic structural diagram of the lower corner coupling member in the dashed box;

[0047] Figure 17 Shows a schematic diagram of a portable vehicle in an unfolded and frame-separated state for the third type of embodiments of the present invention;

[0048] Figure 18 Shows an assembly schematic diagram of the lower corner coupling member and the longitudinal support rod of a portable vehicle for the third type of embodiments of the present invention;

[0049] Figure 19 Shows a schematic diagram of a portable vehicle in an unfolded and frame-separated state for the third type of embodiments of the present invention;

[0050] Figure 20 Shows a schematic diagram of a portable vehicle of the third type of embodiments of the present invention in the state of being unfolded into a flatbed truck;

[0051] Figure 21 Shows a schematic cross-sectional view of the front handle of a portable vehicle of the fourth type of embodiments of the present invention;

[0052] Figure 22 Shows Figure 21 A schematic cross-sectional view of the handle telescopic locking mechanism within the dashed box of

[0053] Figure 23 Shows Figure 21 A schematic cross-sectional view of the handle telescopic locking mechanism within the dashed box of Detailed implementation manners

[0054] In this section, we will explain several implementation manners of the present invention with reference to the accompanying drawings. Whenever the shape, relative position, and other aspects of the components described in the implementation manners are not clearly defined, the scope of the present invention is not limited only to the components shown. The components shown are only for illustrative purposes. Additionally, although many details are set forth, it should be understood that some implementation manners of the present invention can be implemented without these details. In other cases, well-known structures and technologies are not shown in detail so as not to obscure the understanding of this description.

[0055] The terms used herein are only for the purpose of describing specific implementation manners and are not intended to limit the present invention. Spatially relative terms, such as "under", "below", "beneath", "above", "on", etc., may be used herein for convenience of description to describe the relationship of one element or feature to another or other elements or features, as shown in the drawings. It should be understood that spatially relative terms are intended to cover different orientations during the use or operation of the device in addition to the orientation shown in the drawings. For example, if the device in the drawing is flipped, an element described as "below" or "beneath" other elements or features may then be oriented "above" other elements or features. Thus, the exemplary term "below" can cover both the orientation of above and below. The device can be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein are interpreted accordingly.

[0056] As used herein, the singular forms "a", "the", etc. are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprises" and / or "comprising" define the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or their combinations.

[0057] As used herein, the terms "or" and "and / or" shall be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B and C." An exception to this definition occurs only when the combination of elements, functions, steps or acts is inherently mutually exclusive to some extent.

[0058] As used herein, the term "connection" includes various connection manners including direct connection and indirect connection, and does not require physical contact between the connected parts. It includes various specific connection manners such as snap connection, screw connection, connection without fixing device, welding, riveting, and integral molding. In the case of component fitting, it includes various fitting relationships such as clearance fit, transition fit, interference fit or variable clearance.

[0059] The first type of embodiment

[0060] Figures 1 - 2 is a schematic diagram of the 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 is a schematic diagram of the folded state of the portable vehicle of the present invention.

[0061] The portable vehicle 10 includes a frame assembly 110, a front handle assembly 120, a chassis assembly 140, a wheel assembly 150, and a rear baffle assembly 160. The frame assembly 110 includes an upper frame, a lower frame, and a longitudinal support rod 1109 disposed between the upper and lower frames. The upper frame includes a first support rod in the length direction and a second support rod in the width direction, and the first support rod and the second support rod are connected by an upper corner coupling member 1001 to form a rectangular frame.

[0062] 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 member 1001, and the other end is directly or indirectly connected to an adjacent first support segment. As an alternative embodiment, the first support rod includes three or more first support segments. The first support segments at both ends of the first support rod are connected to the upper corner coupling member, and the other first support segments are directly or indirectly connected to each other.

[0063] Such as Figure 2As shown, the two first support segments 1102 are connected by a rotating connection member. In this embodiment, the rotating connection member is a shaft rod 1107. Shaft holes are respectively provided at both ends of the shaft rod 1107. The first support segments 1102 arranged on both sides of the shaft rod 1107 are rotationally connected to the shaft rod through the shaft holes provided on the shaft rod, enabling the two first support segments 1102 to rotate relative to each other, and thus enabling switching between the folded state and the unfolded state. When the portable vehicle is in the unfolded state, the two first support segments 1102 are substantially straight, making the length of the first support rod the longest; when the portable vehicle is in the folded state, the two first support segments 1102 are in a "V"-shaped folded state, reducing the space occupied by the entire portable vehicle and improving the portability. As an alternative implementation, the first support segments can be directly connected through a rotating shaft. This connection method does not introduce an independent rotating connection component, reducing the structural complexity of the portable vehicle.

[0064] A support reinforcement member is provided on the first support rod. In this embodiment, the support reinforcement member is a support sleeve 1103. The support sleeve 1103 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 segments 1102. The support sleeve 1103 straddles the shaft rod 1107 and the first support segments 1102 provided at both ends of the shaft rod, playing a role in supporting the shaft rod and the two first support segments on the left and right, and keeping the first support rod in a generally straight unfolded state.

[0065] When the portable vehicle is in the unfolded state, the first support rod is subjected to the downward gravity, making the first support rod tend to present a V-shaped bent state. In addition, when the portable vehicle is in use, the first support rod may be subjected to a downward force due to the operator's pressing, placing of heavy objects, etc., and is also prone to deformation. The support sleeve 1103 has a certain length and straddles the shaft rod and the first support segments provided at both ends of the shaft rod. With such a design, on the one hand, the first support rod can be kept in a substantially straight state through the rigid sleeve; on the other hand, since in the folded or free movement state, the fulcrum of the first support segment is located at the rotation axis position of the shaft rod, when the support sleeve 1103 has a certain length and straddles the shaft rod and the adjacent support segment, the fulcrum of the first support segment will move from the rotation axis position of the shaft rod to the end position of the support sleeve, which is equivalent to moving the fulcrum of the first support segment 1102 towards the angle coupling member 1001, reducing the moment on the first support segment 1102, and thus reducing the deformation of the first support segment.

[0066] In this embodiment, the length of the support sleeve 1103 is greater than the length of the shaft rod but less than the length of at least one first support section 1102. With such a setting, when the portable vehicle is in a folded state, the support sleeve 1103 can be received on a certain first support section and the end of the support sleeve will not protrude from the support section, avoiding interference with the folding and enabling the portable vehicle to be folded smoothly.

[0067] Compared with the folding structure of the X-shaped side frame, the frame of the portable vehicle of the present invention uses a first support rod placed horizontally. Therefore, the strength of the first support rod, especially its anti-deformation ability when bearing the pressure of heavy objects, 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 without changing the overall length of the first support rod of the portable vehicle. Since the anti-bending strength of a shorter rod-shaped object is higher than that of a longer rod-shaped object, with such a setting, the anti-bending strength of the first support section can be improved, and further the anti-bending strength of the entire first support rod can be improved. The lower limit values of the ratio of the length of the shaft rod in this embodiment to the length of the first support rod (including the length of the shaft rod 1107 and the lengths of the two support sections 1102) include 1 / 20, 1 / 10, 1 / 8, 1 / 5. When the ratio of the length of the shaft rod to the length of the first support rod is above the above lower limit values, the length of the first support section can be effectively reduced and the anti-bending ability of the first support section can be improved; the upper limit of the ratio of the length of the shaft rod in this embodiment to the length of the first support rod (including the length of the shaft rod and the lengths of the two support sections) includes 1 / 3, 3 / 10, 4 / 15, 1 / 4. Since the shaft rod is in a horizontally placed state in the bent state, the length of the shaft rod will affect the folding compactness of the portable vehicle. When the ratio of the length of the shaft rod to the length of the first support rod is below the upper limit value, the folding compactness of the portable vehicle can be improved. As an optional implementation manner, 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 range of the shaft rod is 5 cm to 33 cm. As another implementation manner, the length of the shaft rod is 1 / 8 to 3 / 10 of the length of the first support rod. As still another implementation manner, 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 not only reduce the length of the first support section to improve the anti-bending performance of the first support section itself, but also reduce the space occupied by the portable vehicle in the folded state.

[0068] For the second support rod in the width direction, it has two second support segments 1105, and the two second support segments 1105 can be switched between the folded or unfolded states. In this embodiment, the two second support segments 1105 are connected by a connecting shaft. As an alternative embodiment, the two second support segments can also be connected by other connecting components such as a shaft 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 connecting part of the two second support segments 1105, straddling the two second support segments, making the second support rod substantially in a straight line state. When the portable vehicle is in the folded state, the support sleeve is received on any one of the second support segments to ensure that the portable vehicle can be folded smoothly.

[0069] The upper corner coupler 1001 is used to connect the first support rod and the second support rod of the upper frame and connect the longitudinal support rod 1108. The upper corner coupler 1001 has three extensions, and these three extensions respectively form receiving grooves for receiving the first support rod, the second support rod, and the longitudinal support rod, and every two extensions are perpendicular to each other. The upper corner coupler is provided with a rotating shaft hole, and the corresponding connecting segments of the first support rod and the second support rod are rotatably connected to the upper corner coupler 1001 through the rotating shaft hole. The receiving grooves of the upper corner coupler 1001 for receiving the first and second support rods are open at the bottom and closed at the top, which is used to limit the rotation direction of the first and second support rods. Under the limiting action of the upper corner coupler, the folding directions of the first support rod and the second support rod are limited to only move downward for folding. The upper corner coupler is provided with a fixing groove on the extension in the vertical direction, and the longitudinal support rod 1108 is arranged in the fixing groove to achieve the connection and fixation with the upper corner coupler. The method for fixing the longitudinal support rod can be screws, bolts, buckles, etc., or even the upper corner coupler and the longitudinal support rod can be integrally formed to ensure the connection stability between the upper corner coupler and the longitudinal support rod.

[0070] As an alternative embodiment, the upper corner coupler is provided with only one or two extensions. For example, the upper corner coupler is only provided with the first extension for receiving the support rod in the length direction, or only provided with the second extension for receiving the extension rod in the width direction, or both the first and second extensions are provided. In the case of only providing one extension or two extensions, the overall weight of the upper corner coupler can be reduced as much as possible.

[0071] The lower frame includes a third support rod 1113 in the length direction and a fourth support rod 1114 in the width direction. The third support rod and the fourth support rod are respectively connected to the lower corner coupling members 1002 and 1003 to form the lower frame. The lower corner coupling members 1002 and 1003 are provided with receiving grooves in the length direction and the width direction. The upper part of the receiving groove is open for limiting 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 coupling members. When the portable vehicle is in a folded state, the third support rod 1113 and 1114 can be detached from the receiving grooves of the lower corner coupling members, enabling the portable vehicle to be folded smoothly and reducing the space occupied by the portable vehicle. In this embodiment, the third and fourth support rods can improve the strength of the lower frame. Moreover, when a bottom plate needs to be installed at the bottom of the portable vehicle, the third support rod can provide a bottom plate support structure, improving the stability of the bottom plate installation. There is no particular limitation on the materials of the third and fourth support rods. Metal materials or plastic materials can be used. When the third and fourth support rods use plastic materials, the weight of the third and fourth support rods can be reduced, making the portable vehicle lighter.

[0072] As an alternative 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-shaped" folded state. With such a design, there is no need to remove the third and fourth support rods when the portable vehicle is folded, making the folding of the portable vehicle more convenient.

[0073] As Figure 1 , Figure 3As shown, the portable vehicle further includes a chassis assembly 140. The chassis assembly 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 mounting holes. One end of the base rod 1402 is rotatably mounted to the base rod mounting groove through the mounting holes. The base rod mounting groove opens downward to limit the upward rotation of the base rod 1402. When the portable vehicle is in the unfolded state, the chassis assembly 140 is in the extended state, and the base rod 1402 fits or is close to the upper part of the base rod mounting groove of the base 1401. When the base 1401 bears 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 sink. The base extension 1401 has a certain length. In this 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 values of the ratio range of y to d include 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 value, 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 values of the ratio range of the diagonal length y of the base extension 1404 to the diagonal length d of the chassis assembly include 25%, 30%, and 35%. Since the base extension itself is rigid and plays a load-bearing role, the base extension cannot be folded together when the portable vehicle is in the folded state. By setting the diagonal length of the base extension 1404 to be 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 range of the diagonal length y of the base extension 1404 to the diagonal length d of the chassis assembly is 10% to 35%. Optionally, the ratio range is 15% to 30%. Additionally optionally, the ratio range is 20% to 30%.

[0074] The other end of the base rod 1402 is mounted to the lower corner couplings 1002 and 1003 and can rotate around the lower corner couplings. As Figure 2 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 folding of the upper frame and the lower frame. At this time, the upper corner couplings also approach each other. The portable vehicle will finally present a folded state in which the upper corner couplings surround and are close to the base, the horizontal support rods are folded or removed, and the longitudinal support rods are adjacent to each other.

[0075] As Figure 1As shown, the portable vehicle further includes a rear baffle assembly 160, which is disposed at one end of the portable vehicle frame away from the front handle. The rear baffle includes two rear baffle brackets 1601 and a staggered rod 1602 disposed between the rear baffle brackets. The staggered rod 1602, as a type of rear baffle blocking member, can prevent the goods placed in the portable vehicle frame from leaking out from the rear of the portable vehicle. One end of the rear baffle bracket 1601 is connected to the lower corner coupling member 1002. As an alternative embodiment, this connection can be a rotational connection. Through this rotational connection, the rear baffle can be switched between the retracted and lowered states. When the rear baffle is retracted, it functions to block the leakage of objects in the portable vehicle frame; when the rear baffle is lowered, it can increase the load-carrying area of the portable camp cart in the horizontal direction. At this time, if the portable vehicle can remove the longitudinal support rod together with the upper frame to become a flatbed cart, the lowered baffle can further increase the load-carrying area of the flatbed cart. As an alternative embodiment, the rear baffle can be provided in an integrally formed manner, such as being formed in a "U" shape. As another alternative embodiment, the blocking member of the rear baffle can be various structures for blocking the leakage of objects, such as steel wires, elastic cords, and mesh bags, disposed between the rear baffle frames.

[0076] Figure 4 , Figure 5 is a detailed view of the upper corner coupling member of this embodiment. The extension of the upper corner coupling member 1001 in the direction of the first support rod is the first extension 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. In this embodiment, the frame limit portion 1003 is an elastic limit portion, including a spring and a sphere fixed to one end of the spring. When the sphere is subjected to pressure, it will move downward and compress the spring to cause elastic deformation. At this time, the first support rod can smoothly rotate within the first extension. When the pressure applied to the sphere is removed, the spring pops outwards and causes the sphere to move outwards to protrude from the end face of the extension. At this time, the rotation of the first support rod within the first extension will be restricted by the frame limit portion, thereby increasing the difficulty of changing the movement trend of the first support rod. Specifically, when the first support rod is in the unfolded state, the elastic limit portion is located below the first support rod to restrict the downward movement of the first support rod and keep the first support rod in the unfolded state; when the first support rod is in the folded state, the elastic limit portion is located outside the first support rod to restrict the outward movement of the first support rod and keep the first support rod in the folded state. Adopting such a design can improve the state stability of the portable vehicle in the folded and unfolded states. In this embodiment, the limiting structure of the elastic limit portion uses a sphere, which can utilize the downward pressure generated by the movement of the first support rod on the sphere, thereby conveniently pressing down the sphere. The sphere here can also be other structures with curved surfaces, including hemispheres and ellipsoids.

[0077] As an alternative embodiment, the limiting part is a non-elastic limiting part (not shown in the figure). Further optionally, the non-elastic limiting part is a bolt limiting device, including a bolt hole provided at the corner of the corner coupling member and a bolt capable of moving in the bolt hole. When the portable vehicle needs to change its position, the bolt is pulled out from the bolt hole, and the support rod is no longer limited by the bolt and can rotate freely. When the portable vehicle is in the unfolded or folded state and needs to maintain this state, the bolt is locked, and the bolt provided at the corner of the corner coupling member limits the support rod, so that the portable vehicle maintains the unfolded or folded state, improving the usability of the portable vehicle. As other alternative embodiments, the non-elastic limiting part further includes a screw, a buckle, etc.

[0078] As other alternative embodiments, the limiting part can also be provided at the corner position of any corner coupling member extension or at the corner position of the base extension. When the corner position of the lower corner coupling member extension is provided with a frame limiting part, the frame limiting part can limit the third and / or fourth support rods; when the corner position of the base extension is provided with a chassis limiting part, it can limit the base rod. The limiting part limits the support rod and / or the base rod when the portable vehicle is in the folded or unfolded state, avoiding the automatic unfolding of the portable vehicle in the folded state and also avoiding the folding of the portable vehicle in the unfolded state due to the action force in a specific direction.

[0079] Such as Figure 1 , 2As shown in the figure, the front handle assembly 120 is provided at the front of the portable vehicle. The main function of this handle assembly is to provide pulling force, and such an operation method is more suitable for the occasion of pulling a large-load portable vehicle. The front handle assembly 120 includes a grip 1201, and the grip 1201 is installed on the handle frame 1202. The handle frame 1202 is U-shaped. With such a design, sufficient holding space can be left between the grip and the handle frame, improving the holding comfort of the handle. A leather or leather-like material can be sleeved on the grip 1201 to improve the holding comfort. A buffer structure can also be provided with sponge, leather or leather-like material in the space enclosed by the handle frame 1202 and the grip 1201 to further improve the holding comfort. The handle frame 1202 is connected to the handle rod, and the handle rod includes three telescopable rods 1203, 1204, 1205 that are sleeved with each other. The telescopable rods 1203, 1204 can slide relative to the telescopable rod sleeved outside them to achieve the effects of telescoping and unfolding. Limit devices are provided at the bottoms of the telescopable rods 1203, 1204 to prevent the telescopable rods from detaching from the telescopable rod they are sleeved with during the elongation process. The surfaces of the telescopable rods in this embodiment are provided with multiple vertical reinforcing ribs, and these reinforcing ribs can increase the strength of the telescopable rods and prevent them from deforming. As an alternative implementation, other types of reinforcing ribs such as grid-shaped and wavy can also be provided. The handle link 1207 is installed on the handle seat 1206. 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 coupler. As an alternative implementation, the handle link can also be connected to the lower frame or the chassis. The handle link installation groove has a certain amount of movement space, so that the handle link 1207 can also move within a certain angular 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 on the lower corner coupler 1003 through the installation slider 1208. The installation slider 1208 can rotate along the length direction of the portable vehicle in the installation groove of the lower corner coupler. The installation slider 1208 is rotatably connected to one end of the handle link 1207. The installation slider has a certain height and protrudes from the lower corner coupler, which raises the installation position of the handle link 1207 and avoids interference between the handle link 1207 and the lower corner coupler, enabling the horizontally arranged handle link 1207 to rotate along the length direction of the portable vehicle as the slider rotates. Based on the above settings, 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 use this handle to well control the directional operations such as turning and getting out of trouble of the portable vehicle, improving the operation convenience of the portable vehicle.

[0080] The wheel assembly 150 is used to carry the portable vehicle and drive the movement of the portable vehicle. The wheel assembly includes a front wheel 1501 and a rear wheel 1503. A brake pad 1502 is provided on the front wheel 1501, and a brake pad 1504 is provided on the rear wheel 1503. The front wheel 1501 is a swivel wheel, which can improve the maneuverability of the portable vehicle when pulling the portable vehicle using the handle 120. As an alternative embodiment, the rear wheel 1503 is also a swivel wheel. A direction locking device is provided on the front wheel 1501 and the rear wheel 1503. When driving the portable vehicle using the front handle, 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 the universal adjustment function. In some scenarios, the portable vehicle has a rear handle (not shown in the figure), or it is necessary to push the vehicle 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 the universal adjustment function. For the front and rear wheels both using the direction locking device, no matter in which direction the operator drives the portable vehicle, the wheel close to the driving direction / position can be set as a swivel wheel, and the direction of the wheel far from the driving direction / position is locked, so that the direction of the portable vehicle can be well controlled. As another alternative embodiment, the wheel assembly is installed on the portable vehicle body through a quick-release structure. When it is necessary to replace / switch the swivel wheel, the replacement effect can be quickly achieved through the quick-release structure. The quick-release structure here is not particularly limited, and includes various quick-release structures such as buckles, threads, and elastic sleeves.

[0081] When using the portable vehicle according to the first embodiment of the present invention, as Figure 1 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 segments 1102 of the first support rod are arranged oppositely and are substantially on the same straight line as the shaft rod 1107 connecting the support segments. The two first support segments 1105 of the second support rod are also arranged oppositely and are substantially in a straight line state. The support sleeve 1103 is installed at the position of the shaft rod 1107 and straddles two adjacent support segments 1102. At this time, the support sleeve 1103 simultaneously limits the shaft rod and the support segments on both sides thereof, so that the first support rod is substantially straight and can maintain a straight state in the unfolded state. The support sleeve 1106 provided on the second support rod is installed at the position where the second support segments 1105 are connected to each other in the unfolded state, so that the second support rod can be substantially kept straight 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.

[0082] As Figure 2As shown, when folding the portable vehicle of the first embodiment of the present invention, the shaft rod of the first support rod moves downward, causing the two first support segments and the second support segment to rotate around the upper corner coupling, and making the first support rod and the second support rod in a "V"-shaped folded state. At the same time, the base 1401 moves upward, and the base rod 1402 moves around the rotation axes of the lower corner couplings 1002 and 1003 and the rotation axis of the base extension 1404. The upper corner coupling and the lower corner coupling approach each other respectively, achieving inward folding. In the folded state, the support sleeve 1103 slides and is received on the first support segment, and neither end of the support sleeve contacts the shaft rod or the adjacent support segment. In the folded state, the base 1401 is basically in a state of being in contact with or close to the upper corner coupling 1001, and the horizontal height of the base 1401 in the folded state is basically flush with the upper part of the corner coupling 1001. In the folded state, the handle assembly 120 can be in a folded state or an unfolded state, and the operator can still operate the camping cart in the folded state through the handle assembly 120.

[0083] As the portable vehicle of the first embodiment of the present invention, without adopting the side X-shaped structure, it can ensure the strength of the body frame, reduce the total length of the support rods used in the portable vehicle, reduce the weight of the portable vehicle, and improve the portability of the portable vehicle.

[0084] When the third support rod is foldable, there may be a problem that two support rods located in the same vertical plane interfere 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, they may interfere with each other in the folded state.

[0085] As Figure 6 Shown is a top view of the portable vehicle of this embodiment. In this embodiment, the distance dl between the two third support rods 1113 is shorter than the distance du 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 and present a "staggered" state. With such a design, when the portable vehicle is in the folded state, the first support rod bends inward to form a positive "V" shape, and the third support rod bends upward to form an inverted "V" shape. The first and third support rods are staggered in the width direction of the portable vehicle, avoiding interference with each other and improving space utilization. As an alternative embodiment, the distance dl between the two third support rods 1113 is longer than the distance d2 between the two first support rods 1102. With such a setting, the bottom accommodation space of the portable vehicle can be expanded.

[0086] As another alternative embodiment of the side folding structure, as Figure 7As shown in the figure, the first support rod and the third support rod are composed of support segments with different lengths. For the first support rod, the support segment at the left position in the figure is the longer support segment 1701, and the support segment at the right position in the figure is the shorter support segment 1702. The two support segments are connected by a shaft rod 1703. For the third support rod, the support segment at the left position in the figure is the shorter support segment 1704, and the support segment at the right position in the figure is the longer support segment 1705. The two support segments 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 of the difference between the length of the longer support segment and the length of the shorter support segment to the length of the longer support segment is defined as the "length deviation ratio". The lower limit values of the length deviation ratio in this embodiment include 5%, 10%, and 15%. When the length deviation ratio of the long and short support segments is above these lower limit values, it is ensured that the support segments can present a mutually "staggered" posture in the folded state, achieving a compact folding structure. The upper limit values of the length deviation ratio of the support segments in this embodiment include 20%, 25%, and 30%. When the length deviation value of the long and short support segments is below these upper limit values, the rotation angle of the two support segments with long and short designs in the folded state is 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 its "length deviation ratio" is (47 - 38) / 47 * 100% ≈ 19.1%.

[0087] Second type of embodiment

[0088] As Figure 8The second embodiment of the present invention is shown. 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 disposed 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 in the length direction and a second support rod in the width direction. The first support rod includes at least two first support segments 2102 and 2104, and the second support rod includes two second support segments. The first support rod and the second support rod are connected by an upper corner coupling member 2001 to form a rectangular frame. In this embodiment, the bottom of the portable vehicle only includes a fourth support rod disposed horizontally. As an alternative embodiment, the bottom of the portable vehicle does not include support rods in the length direction and the width direction. As another alternative embodiment, when the bottom of the portable vehicle does not have a support rod in the width direction, the length of the handle link of the portable vehicle in the fully opened state is equal to the distance between two lower corner coupling members to serve as a substitute for the support rod in the width direction.

[0089] The rear handle assembly 230 is disposed at the rear of the portable vehicle. The main function of the rear handle assembly is to provide thrust and is suitable for occasions where the camp cart is pushed to move. 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 operation angle for the operator. The upper handle 2302 includes two handle segments, and the two handle segments are rotatably connected by a rotating connector 2304. The rotating connector 2304 enables the two handle segments of the upper handle to be folded in a "V" shape, thereby reducing the folding volume of the portable vehicle.

[0090] The two first support segments 2102 and 2104 of the first support rod are connected by a shaft rod 2107. In the unfolded state of the portable vehicle, the first support segments 2102 and 2104 are turned outwards until the two support segments are substantially in a straight line, and the effective area of the frame of the entire portable vehicle in the unfolded state is maximized.

[0091] The first support rod further includes a support reinforcement member. In this embodiment, the support reinforcement member is a limit rod 2103. The limit rod 2103 is rotatably connected to any one of the two first support segments. A limit card slot 2111 is provided in the other support segment adjacent to the connection of the limit rod 2103. In this embodiment, the limit rod 2103 is rotatably connected to the first support segment 2102, and the limit rod 2013 can rotate in a plane perpendicular to and / or substantially perpendicular to the bottom surface of the portable vehicle. As an alternative embodiment, the limit rod can also rotate in a plane parallel to and / or substantially parallel to the bottom surface of the portable vehicle. The other end of the limit rod is provided with a limit buckle 2106. When the portable vehicle is in the unfolded state, the limit rod 2103 is snap-connected to the first limit card slot 2111 of the support segment 2102 through the limit buckle 2106. At this time, the limit rod 2103 straddles the two first support segments 2102 and 2104, and simultaneously provides a support force to these two support segments, thereby ensuring that the two first support segments can maintain a straight state in the unfolded state. At the same time, since the limit rod 2103 itself has a certain strength, such a setting can improve the load-bearing capacity of the first support rod in the unfolded state.

[0092] As Figure 8 shown, the underframe assembly of the portable vehicle includes a base 2401. The base 2401 has a base extension. The base extension extends towards the four diagonals 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 member 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, reducing the force arm of the base rod, enabling the base rod to bear a greater weight, preventing the base from moving further downward, improving the structural stability of the underframe assembly, and thus improving the structural stability of the entire portable vehicle.

[0093] The underframe assembly further includes a bottom support device. The bottom support device 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 along with the movement of the base. The connection mode between the fixed seat 2410 and the base can be a fixed connection or an elastic connection, as long as this connection can apply a force to the base by the fixed seat and can move along with the base. As an alternative embodiment, the fixed seat and the base are integrally formed.

[0094] 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 fixed seat 2410 through a first fixed shaft (not shown). One end of the second pull rod 2412 is rotatably connected to the support connecting member 2416 through a second fixed shaft (not shown). The support connecting member 2416 is mounted on the base rod 2402 and can move with the base rod 2402, and there is no relative displacement between the support connecting member 2416 and the base rod 2402. As an alternative embodiment, a displacement can occur between the support connecting member 2416 and the base rod 2402 within a certain range. This displacement can provide more space for the folding of the traction member, increasing the folding smoothness of the entire portable vehicle. At the same time, since the displacement between the support connecting member 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 connecting member 2416.

[0095] As shown in the figure, the first pull rod 2411 and the second pull rod 2412 are connected through a rotating connecting member 2414. The rotating connecting member has a first rotating connection portion and a second rotating connection portion, and there is a certain distance between the two rotating connection portions. The first pull rod and the second pull rod are respectively connected through the rotating connection portions provided on the rotating connecting member 2414, so that both the first pull rod and the second pull rod can rotate around the rotating connecting member 2414 to achieve relative rotation. The relative position between the first rotating connection portion and the fixed seat 2410 remains unchanged, and thus the relative position with the base remains unchanged; the relative position between the second rotating connection portion and the support connecting member 2416 remains unchanged, and thus the relative position with 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 support connecting member 2416 undergoes a process of changing from far to near. However, the first pull rod 2411 and the second pull rod 2412 are both rigid structures and are difficult to fold by themselves. By providing the rotating connecting member 2414, the distance between the two end points where the rigid first pull rod 2411 and the second pull rod 2412 are connected to the fixed seat and the base rod can change with the folding and unfolding of the portable vehicle, making it possible to fold the traction member in this embodiment, thereby realizing the folding and unfolding of the bottom support device. As an alternative embodiment, in this embodiment, the support connecting member 2416 and the base rod are integrally formed.

[0096] When the portable vehicle is in the deployed state and there are heavy objects inside the vehicle, the base 2401 has a tendency to move downward under the gravitational force of the heavy objects, causing a "depression" inside the portable vehicle. The larger this "depression" is, the weaker the load-bearing capacity of the portable vehicle is. In other words, the ability of the chassis assembly not to produce a depression when bearing heavy objects corresponds to the load-carrying capacity of the portable vehicle. By setting up the bottom support device, when the base 2401 has a tendency 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 vertically upward component of this pulling force is transmitted to the base 2401, preventing the downward movement of the base 2401, avoiding the depression of the chassis assembly, improving the structural stability of the chassis assembly, and thus improving the load-bearing capacity of the portable vehicle.

[0097] As Figure 9 shown is another implementation of the limiting rod. In this embodiment, the first support rod includes two support sections at both ends, 3102 and 3104. In addition to the limiting buckle 3106 and the first limiting card slot 3111, a second limiting card slot 3112 is also provided on the first support section 3104. When the portable vehicle is in the deployed state, the limiting buckle 3106 of the limiting rod 3103 is snapped into the first limiting card slot 3111 to keep the portable vehicle in the deployed state. As Figure 10 shown, when the portable vehicle is in the folded state, the limiting buckle 3106 of the limiting rod 3103 is snapped into the second limiting card slot 3112 to keep the portable vehicle in the folded state. By respectively setting the first limiting card slot 3111 and the second limiting card slot 3112, the portable vehicle can not only be kept in the deployed state but also be kept in the folded state, solving the problem that the existing portable vehicle needs to be fixed by a buckle rope or a cloth sleeve in the folded state, preventing the loss of the buckle rope or the cloth sleeve, and improving the use convenience of the portable vehicle. When using the limiting rod 3103 as the reinforcement device for the first support rod, a support sleeve 3105 can also be used as the reinforcement device at the same time, further increasing the strength of the first support rod in the deployed state.

[0098] As Figure 11Another embodiment of the bottom support device of the present invention is shown. The chassis assembly 440 includes a base 4401 and a base rod 4402 rotatably connected to the base. The chassis assembly 440 further includes a bottom support device, which includes a fixed seat 4410 and a traction member 4411. The fixed seat 4410 is mounted to the base 4401 and can move with the base, and the fixed seat 4410 can also provide a mutual force to the base 4401. As an alternative embodiment, the fixed seat and the base are integrally formed. The support connecting member 4412 is mounted to the base rod 4402 and can move with the base rod 4402, and the support connecting member 4412 can provide a mutual force to the base rod 4402. As an alternative embodiment, the support connecting member and the base rod are integrally formed. The traction member 4411 is disposed between the fixed seat 4410 and the support connecting member 4412. In this embodiment, the traction member 4411 is an elastic drawstring. The elastic drawstring undergoes elastic deformation when subjected to a tensile force. After the tensile force is removed, the elastic drawstring can return to its original length. The greater the elastic deformation of the elastic drawstring, the greater the elastic tensile force 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 connecting member 4412. The traction member 4411 provides tensile forces to the fixed seat 4410 and the support connecting member 4412 respectively. Among them, the tensile force provided by the traction member 4411 to the fixed seat 4410 has an upward component force, which cancels or partially cancels the gravity borne by the base 4401, preventing the base 4401 from moving downward and causing a depression. Through such a setting, when the portable vehicle is in the unfolded state, the distance between the support connecting member 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 tensile force provided by the traction member 4411 to the fixed seat is the largest, further improving the load-bearing capacity of the chassis assembly. In addition, since the elastic drawstring has a certain deformation ability, it can play a shock-absorbing role. In the case of transporting fragile items, precision instruments and other goods, this shock-absorbing effect can effectively protect the goods placed in the portable vehicle.

[0099] As an alternative embodiment, the traction member can also be a steel wire rope or other rigid drawstrings that do not have elasticity or have weak elasticity. The length of the rigid drawstring is not greater than the distance between the support connecting member 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 as to effectively provide a traction force to the base. At the same time, since the traction member does not generate or is difficult to generate elastic deformation, only when goods are placed in the portable vehicle, the traction member will generate mutual forces between the fixed seat and the base rod. In contrast, if the traction member is an elastic drawstring, when the portable vehicle is in the unfolded state, even if the portable vehicle does not carry goods, the elastic drawstring may continuously provide a traction force to the base, causing the portable vehicle to have a tendency to fold inward and unable to maintain the folded state, affecting the user experience of some users.

[0100] As another alternative embodiment, in the case where the traction member is an elastic drawstring, the length of the elastic drawstring when no elastic deformation occurs is defined as the length of the elastic drawstring, and the distance from the fixed seat to the support connecting member is defined as the deployment distance (specifically, the distance between the connection part of the fixed seat and the elastic drawstring and the connection part of the support connecting member and the elastic drawstring). In this embodiment, the length of the elastic drawstring is less than or equal to the deployment distance. With such a setting, when the portable vehicle is carrying goods, regardless of the weight of the goods, the elastic drawstring can produce elastic deformation and provide a traction force to the fixed seat. At the same time, the lower limit of the ratio between the length of the elastic drawstring and the deployment distance is set to 70%, preferably 80%, more preferably 90%. By controlling the elastic deformation of the elastic drawstring in the deployed state, the traction force generated by the elastic drawstring under no-load conditions is reduced, and the tendency of the portable vehicle to fold inward is decreased.

[0101] As Figure 12The figure shows a schematic diagram of another embodiment of the support reinforcement member of the present invention. When the portable vehicle is in the deployed state, the support reinforcement member is used to keep two adjacent support segments 4102 and 4104 in a straight state and can share part of the gravity borne by the support rod. The support reinforcement member is a latch rod 4106, and latch buckles 4105, 4108, and 4109 are provided on the support segments 4102 and 4104. In this embodiment, the latch buckles 4105 and 4108 are provided on the support segment 4102, and the latch buckle 4109 is provided on the support segment 4104. In addition, a first bump 4111 and a second bump 4112 are also provided on the support segment 4102. A latch tongue 4110 is fixedly connected to the latch rod 4106. The latch rod 4106 can move within the space formed between the latch buckles 4105, 4108, 4109 and the support segment, so that the support reinforcement member can be switched between the locked state and the open state. When the portable vehicle is in the deployed state, the latch rod 4106 passes through the latch buckles 4108 and 4109 respectively to span the adjacent support segments 4102 and 4104, and at the same time the latch tongue 4110 is snapped into the first bump 4111. At this time, due to the limitation of the latch rod, the latch buckle, and the latch tongue, there is contact and mutual force between the support segments 4102 and 4104 and the latch rod 4106, so that the relative rotation between the support segments 4102 and 4104 is prevented, the stability of the support rod in the deployed state is improved, and the load-bearing capacity is increased. And, since there is a certain distance between the latch buckles 4108 and 4109 and the ends of their respective support segments, the latch buckles 4108 and 4109 can be regarded as the fulcrums of their respective support segments. Compared with the prior art technical solution of internal limitation of the rotating connection member, the value of the moment obtained by multiplying the force exerted by the support reinforcement member of this embodiment on the support segment by the distance between the force and the latch buckle is further reduced, the stability of the latch buckles 4108 and 4109 is improved, and the load-bearing capacity of the upper frame support rod is further improved. When the portable vehicle is about to be folded or in the folded state, the latch rod 4106 passes through the two latch buckles 4105 and 4108 provided on the support segment 4102 respectively, does not pass through the latch buckle 4109 provided on the support segment 4104, and the latch tongue 4110 is snapped into the second bump 411. At this time, the latch rod is accommodated on the first support segment, and at the same time the support segments 4102 and 4104 can rotate freely along the shaft rod 4103, so as to realize the folding of the upper frame support rod.

[0102] As another alternative embodiment, the first support rod adopts a hollow support segment, and the latch rod is arranged inside the support segment to improve the structural simplicity.

[0103] The third type of embodiment

[0104] Such as Figure 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 segments, and the second support rod includes at least two second support segments. The first support rod and the second support rod are connected by an upper corner coupling to form a rectangular frame.

[0105] In this embodiment, the second support rod can be telescoped along the extending direction of the second support rod, so as to change the overall length of the second support rod. In this embodiment, the second support rod has two width support segments, and each width support segment 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. As Figure 14 Shown is a detailed view of a certain support segment of the width support segment in this embodiment. In this embodiment, a plurality of elastic buckles 5108 are provided on the inner rod, and limit card holes 5107 are provided on the outer rod. During the process of the inner rod moving along the hollow structure of the outer rod, when the elastic buckles on the inner rod correspond to the limit card holes on the outer rod, the elastic buckles on the inner rod cooperate with the limit card holes on the outer rod to limit the inner rod. When it is necessary to change the relative position between the inner rod and the outer rod, press the elastic buckle on the inner rod. At this time, since there is no longer a limiting 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 segment can be switched between the extended state and the contracted state. By providing a plurality of elastic buckles on the inner rod, in actual operation, only by blocking the limit card holes on the outer rod to prevent the elastic buckles on the inner rod from popping out, the inner rod can be easily slid in the hollow structure of the outer rod, improving the convenience of adjusting the telescopic length of the second support segment. The locking knob 5009 provided on the corner coupling 5001 is used to fix the longitudinal support rod in the corner coupling.

[0106] As Figure 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 disposed within the hollow structure of the outer rod and is capable of moving along the outer rod. A plurality of card slots 6108 are provided on the inner rod, and a snap 6109 is provided on the outer rod. The snap provided on the outer rod can be switched between a locked state and a released state. When the card slot on the inner rod corresponds to the snap on the outer rod, the snap is pressed or rotated to be in the locked state. At this time, the snap protrudes towards the inner rod, and the protruding snap cooperates with and limits the card slot on the inner rod, so that the relative positions of the inner rod and the outer rod are fixed. When it is necessary to change the relative positions of the inner rod and the outer rod, the snap provided on the outer rod is pressed or rotated to be in the released state. In the released state, there is no longer a limiting relationship between the snap provided on the outer rod and the card slot provided on the inner rod, and the inner rod can move freely along the hollow structure of the outer rod, so that the second support section can be switched between an extended state and a retracted state. Compared with the technical solution of providing an elastic snap on the inner rod, only providing a snap on the outer rod that can be switched between the locked and released states reduces the complexity of the telescopic structure of the support rod, and improves the reliability of the telescopic structure of the second support section while reducing costs. As other telescopic limiting devices, it is also possible to use methods such as tightening screws to provide friction to lock or fix the state of the telescopic support rod. The locking knob 6009 provided on the corner coupler 6001 is used to fasten the longitudinal support rod and the corner coupler.

[0107] As another alternative 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 disposed within the hollow structure of the outer rod and is capable of moving along the outer rod. There is contact and friction between the outer surface of the inner rod and the inner surface of the outer rod, and this friction limits the relative positions of the inner rod and the outer rod. When the second support section is in the extended or retracted state, the relative positions of the inner rod and the outer rod will not easily change. Using friction to limit the relative positions of the outer rod and the inner rod further reduces the complexity of the telescopic structure and improves the reliability of the system.

[0108] At the same time, as Figure 16As shown, the lower corner coupler 6002 is provided with a receiving groove for accommodating the longitudinal support rod. The longitudinal support rod 6104 is connected to the lower corner coupler through this receiving groove and then connected to the lower frame and the chassis. The receiving groove of the longitudinal support rod is provided with a shaft hole (not shown in the figure). The longitudinal support rod is connected to the lower corner coupler 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 coupler 6002 and the lower frame. The receiving groove of the lower corner coupler 6002 for accommodating the longitudinal support rod is open 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 coupler 6002 is provided with a limiting structure 6005. The limiting structure 6005 is arranged outside the receiving groove and can limit the rotation angle of the longitudinal support rod between 0° and 30°. Optionally, when the lower corner coupler provides limitation, the telescopic structure of the second support rod may not provide telescopic state locking structures such as buckles and holes, and directly use the limiting structure of the corner coupler to limit the opening degree.

[0109] As another alternative embodiment, the limiting structure of the longitudinal support rod receiving groove of the corner coupler is arranged in the horizontal direction (not shown in the figure) and is used to "support" the longitudinal support rod when the longitudinal support rod is unfolded 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 relatively large loading platform for use as a flatbed truck. Correspondingly, the second support rod is detachably connected to the upper corner coupler. When the portable vehicle needs to be unfolded, the connection between the second support rod and the upper corner coupler is disconnected, so that the longitudinal support rod rotates within the range of 0° to 90°.

[0110] Optionally, the longitudinal support rod includes a sleeved structure with at least two sections, which can be telescopically extended up and down to change the height of the portable vehicle, and then increase or decrease the volume of the accommodation space enclosed by the portable vehicle frame. When the longitudinal support rod of the portable vehicle can be telescopically extended up and down and the second support rod can be extended or shortened, the frame of the portable vehicle simultaneously has the functions of "opening" and "growing taller". When facing a load with a relatively large volume, the size of the object that the portable vehicle can accommodate is increased, and the usability of the portable vehicle is improved.

[0111] As Figure 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.

[0112] like Figure 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.

[0113] The support reinforcement between the two support sections of the first support rod in this embodiment adopts the structure of bolt rods and buckles. When the portable vehicle is in the unfolded state, the bolt rods respectively pass through the buckles arranged on two adjacent support sections, so that the first support rod maintains the unfolded state and improves the load-bearing capacity of the first support rod. The flat part includes two flat buckles (not shown in the figure) arranged below the flat part. When the flat part is placed on the upper frame, the two flat buckles are staggered with the buckles arranged on the second support section and "clamp" the buckles arranged on the second support section, and the holes of the two flat buckles correspond to the buckles on the second support section, so that the bolt rod can pass through the flat buckles and the buckles arranged on the second support section at the same time. At this time, due to the limiting effect of the two flat buckles on the buckles on the second support section, the flat part 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 limitation of the bolt rod, the flat part and the first support rod cannot move relative to each other in the direction perpendicular to the first support rod either. In this case, the flat part and the frame assembly of the portable vehicle are fixed to each other, improving the stability of the mobile table structure and making the position transfer of the mobile table more convenient.

[0114] As an alternative implementation, a magic tape is provided at the bottom of the flat part 7801. When the flat part is placed on the upper frame, the relative positions between the flat part and the first support rod and / or the second support rod are fixed through the magic tape. As other alternative implementations, the fixation between the flat part and the upper frame can also adopt other detachable connection methods such as snap connection and screw connection.

[0115] As Figure 19 shown, the flat part 7801 includes more than two folding plates and nylon cloth sleeves sleeved on each folding plate. The nylon cloth sleeves form an accommodation space according to the shape and quantity of the folding plates, and the folding plates are placed in the accommodation space. Since the texture of the nylon cloth sleeve is relatively soft, the folding plates sleeved in the nylon cloth sleeve can be switched between the opened and folded states. When the folding plates are in the opened state and placed on the upper frame, under the support of the upper frame, the folding plates can be in the opened state.

[0116] As Figure 20 shown, the flat part 7801 of this embodiment can also be arranged on the chassis assembly 740. When the flat part is arranged on the chassis assembly, the portable vehicle can be used as a flat trailer. In this case, the portable vehicle can carry objects with greater length and width, improving the load-carrying capacity of the portable vehicle. As other extended ways, the components arranged on the chassis assembly 740 can also be storage boxes, water tanks, mobile devices, etc., further expanding the application scenarios of the portable vehicle.

[0117] The fourth type of embodiment

[0118] AsFigure 21 The specific structure of an embodiment of the front handle of the present invention is shown. The handle assembly 820 includes a front handle, specifically including a grip 8201 and a handle frame 8202. The grip 8201 is installed in the grip space formed by the handle frame 8202. The handle frame 8202 is connected to the inner rod 8203. As an alternative embodiment, the handle frame 8202 and the inner rod 8203 are integrally formed. The outer rod 8204 has a hollow structure and is sleeved outside the inner rod 8203. The inner rod 8203 can slide along the hollow structure of the outer rod 8204 to achieve elongation or contraction. The handle assembly further includes a telescopic button 8205. In this embodiment, the telescopic button 8205 is provided at the opening of the handle frame and at the end of the grip. Setting the telescopic button at this position enables the operator to conveniently press the switch to control the telescoping of the handle while holding the handle. The handle frame has a hollow structure, in which a first connecting rod 8206 and a second connecting rod 8207 are provided. One end of the first connecting rod 8206 is connected to the telescopic button 8205 and can move together with the pressing or lifting of the telescopic button 8205. The other end of the first connecting rod 8206 is rotatably connected to the second connecting rod 8207. The angle between the first and second connecting rods can be changed around the connecting shaft. The second connecting rod is sleeved on the rotating shaft 8208 and can rotate around the rotating shaft 8208. The other end of the second connecting rod 8207 is connected to the steel wire rope 8210 and can drive the steel wire rope 8210 to move up and down. The steel wire rope is connected to a telescopic locking mechanism provided at the bottom of the front handle. The telescopic locking mechanism is fixed to the inner rod 8203 and can move along the hollow outer rod together with the inner rod 8203. A plurality of limiting holes are provided on the outer rod 8204 along the vertical direction.

[0119] The structure of the telescopic locking mechanism is as Figure 22 、 23As shown, it includes a first slider 8213 and a second and third sliders 8214 and 8215. The first slider 8213 is connected to the hook 8212 (or the two are integrally formed), and the hook 8212 is connected to the wire rope 8210. As an optional embodiment, the wire rope is directly connected to the first slider. The first slider 8213 can move up and down in the vertical direction under the pull of the wire rope 8210. An elastic member 8216 is arranged between the second slider 8214 and the third slider 8215. In this embodiment, the elastic member 8216 is a spring. More specifically, the elastic member 8216 is a compression spring. The compression spring has a certain length. When pressure is applied to the compression spring, the compression spring is compressed inwardly, deformed, and generates an outward elastic force. The elastic member 8216 is arranged between the second and third sliders to maintain the distance between the second and third sliders. The second and third sliders include a protrusion and a sliding portion. The shape of the protrusion corresponds to the shape of the limiting hole on the outer rod 8204, and can be inserted into the limiting hole to lock the telescopic length. The sliding part is provided with a triangular sliding groove, and correspondingly, the part where the first slider 8213 contacts the second and third sliders is provided with a triangular sliding platform. When the user presses the telescopic button 8205, the first connecting rod drives the end of the second connecting rod to move upward, and pulls the wire rope upward, and the first slider 8213 also moves upward under the tension of the wire rope. Due to the limitation of the sliding grooves of the second and third sliders and the sliding platform of the first slider, the second and third sliders approach each other, and the protrusion is retracted from the limiting hole on the outer rod 8204, and the elastic member 8216 produces elastic deformation. At this time, the inner rod 8203 and the outer rod 8204 can move relative to each other, thereby changing the telescopic length of the handle bar. When the user releases the telescopic button 8205, the second and third sliders return to the state of being away from each other under the force of the elastic member 8216, and emerge from the limiting hole corresponding to the outer rod 8204, limiting the mutual movement between the inner rod and the outer rod, so that the handle maintains the telescopic length.

[0120] Optionally, telescopic control buttons are provided in the handle frame openings on both sides of the grip, and the telescopic control buttons on both sides can pull the wire rope through two connecting rods to achieve the control of the bottom telescopic locking mechanism. With such a design, whether the operator holds the grip with the left hand or the right hand, the extension or contraction of the telescopic rod can be controlled by the buttons provided at both ends of the grip 8201, which greatly improves the convenience of the handle control.

[0121] 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 that can be switched between a folded state and an unfolded state, comprising: A chassis assembly for providing bottom support; A frame assembly including longitudinal support rods, wherein the chassis assembly and the longitudinal support rods are connected by corner coupling members to form an accommodation space of the portable vehicle; A handle assembly mounted to the chassis assembly and / or the frame assembly for transmitting driving force to the chassis assembly and / or the frame assembly; A wheel assembly mounted to the chassis assembly and / or the frame assembly and driving the chassis assembly and / or the frame assembly to move; The chassis assembly includes a base and a base rod; the base has a base extension; one end of the base rod is rotatably connected to the base, and the other end of the base rod is rotatably connected to the corner coupling member and / or the longitudinal support rod in the frame assembly; The chassis assembly further includes a bottom support device, and the bottom support device includes a fixed seat and a traction member; the fixed seat is connected to the base; the traction member is connected to the fixed seat and can move with the base rod, and in the unfolded state, the traction member provides support to the base.

2. The portable vehicle according to claim 1, wherein: In the unfolded state, the traction member provides a first traction force to the fixed seat; In the folded state, the traction member provides a second traction force to the fixed seat, and the second traction force is less than the first traction force.

3. The portable vehicle according to claim 2, wherein: The second traction force is equal to zero.

4. The portable vehicle according to claim 1, wherein: The fixed seat can move with the base to apply a force to the base; The fixed seat and the base are integrally formed.

5. The portable vehicle according to claim 1, wherein: A support connecting member is provided on the base rod, and the support connecting member can move with the base rod; the support connecting member is fixedly arranged relative to the base rod or can displace; the other end of the traction member is connected to the support connecting member, and the traction member provides a force to the base rod through the support connecting member.

6. The portable vehicle according to claim 5, wherein: The support connecting member and the base rod are integrally formed.

7. The portable vehicle according to claim 5, wherein: 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, and the other end of the first pull rod is rotatably connected to the second pull rod; One end of the second pull rod is rotatably connected to the support connecting member.

8. The portable vehicle according to claim 5, wherein: The traction member is an elastic pull rope; one end of the elastic pull rope is connected to the base, and the other end of the elastic pull rope is connected to the support connecting member; the ratio of the length of the elastic pull rope to the unfolding distance is 70% - 100%; Or, The traction member is a rigid pull rope; one end of the rigid pull rope is connected to the base, and the other end of the rigid pull rope is connected to the support connecting member.

9. The portable vehicle according to claim 1, wherein: The base extension extends towards the four diagonals of the chassis assembly; The base extension is provided with a base rod mounting groove, and the base rod mounting groove is provided with a base rod mounting hole. The base rod is rotatably connected to the base through the base rod mounting hole; The lower part of the base rod mounting groove is open and the upper part is closed to limit the upward rotation of the base rod around the base rod mounting hole.

10. The portable vehicle according to claim 9, wherein: The ratio range of the diagonal length of the base extension to the diagonal length of the chassis assembly is 10% to 35%.

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