Carrier

Abstract

The utility model discloses a carrier, belongs to the technical field of children products, and aims to solve the problems that the existing carrier is still large in size after being folded, is inconvenient to carry and store and the like. The carrier provided by the utility model comprises an underframe assembly; the moving wheel assembly is rotationally connected with the bottom frame assembly; the bearing assembly is arranged above the underframe assembly; and the linkage assembly is arranged between the bearing assembly and the moving wheel assembly, and when the bearing assembly gets close to the bottom frame assembly, the linkage assembly enables the moving wheel assembly to rotate so as to be folded to be coplanar with the bottom frame assembly. After being folded, the carrier is flat in overall structure, neat, small and exquisite, small in occupied space, convenient to store at home and carry outside, and good in use experience.

Description

Technical Field

[0001] This utility model relates to the field of children's products technology, and in particular to a carrier. Background Technology

[0002] Strollers are widely used as a very convenient means of transportation for children. Most existing strollers are foldable, making them easy to fold and compact in size, thus easy to store and carry, meeting consumer demand for foldable strollers. Existing foldable strollers generally include a foldable frame, wheels mounted under the frame, a locking device that locks the frame in the open position, and a seat mounted on the frame for the child to sit in.

[0003] However, existing strollers generally retain their wheels even after folding, resulting in a relatively large size even when folded. This makes them bulky to carry and store, causing significant inconvenience for users in their daily organization, storage, and transportation.

[0004] Therefore, there is an urgent need for a vehicle to solve the aforementioned problems in the existing technology. Utility Model Content

[0005] The purpose of this utility model is to provide a carrier that can be flattened and folded for easy storage and carrying.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A vehicle comprising:

[0008] Base frame assembly;

[0009] The movable wheel assembly is rotatably connected to the base frame assembly;

[0010] A load-bearing component is disposed above the base frame component;

[0011] A linkage component is disposed between the load-bearing component and the moving wheel assembly. When the load-bearing component moves closer to the base frame assembly, the linkage component causes the moving wheel assembly to rotate so that it retracts to be coplanar with the base frame assembly.

[0012] As a preferred technical solution for the aforementioned vehicle, the linkage component includes a connected folding mechanism and a driving mechanism. The folding mechanism is disposed between the load-bearing component and the base frame component, and the driving mechanism is disposed between the base frame component and the moving wheel component. When the load-bearing component moves closer to the base frame component, the folding mechanism changes from an unfolded state to a folded state, and at the same time drives the driving mechanism to move so as to drive the moving wheel component to rotate and fold up to be coplanar with the base frame component.

[0013] As a preferred technical solution for the aforementioned vehicle, the folding mechanism includes a first support rod and a second support rod pivotally connected in an X-shape. One end of the first support rod is movably connected to the front end of the load-bearing assembly, and one end of the second support rod is movably connected to the rear end of the load-bearing assembly. At least one of the other ends of the first and second support rods is movably connected to the drive mechanism. The other end of the first and second support rods that is not connected to the drive mechanism is movably connected to the base frame assembly. The drive mechanism is movably connected to the base frame assembly.

[0014] As a preferred embodiment of the aforementioned vehicle, the chassis assembly includes two base rods extending along a first direction and spaced apart along a second direction, and the drive mechanism is movably connected to the base rods; the moving wheel assembly includes two sets respectively disposed on both sides of the chassis assembly along the second direction, each set of the moving wheel assembly including a wheel frame, a front wheel assembly fixed to the front of the wheel frame and a rear wheel assembly fixed to the rear of the wheel frame, and the drive mechanism is capable of driving the wheel frame to rotate relative to the base rods, the first direction being perpendicular to the second direction; the load-bearing assembly is located between the two base rods and coplanar with the base rods in the folded state.

[0015] As a preferred technical solution for the aforementioned vehicle, the wheel frame includes a mounting rod extending along the first direction, the mounting rod being rotatably inserted into the rod cavity of the base rod about its own axis;

[0016] The front wheel assembly includes a first mounting seat fixed to the front of the mounting rod and a front wheel mounted on the first mounting seat. The rear wheel assembly includes a second mounting seat fixed to the rear of the mounting rod and a rear wheel mounted on the second mounting seat. Both the first mounting seat and the second mounting seat are located outside the rod cavity of the bottom rod.

[0017] As a preferred embodiment of the aforementioned vehicle, the underframe assembly further includes a crossbar extending along the second direction and connected between the two base rods, wherein the other end of the first support rod and the other end of the second support rod that are not connected to the drive mechanism are rotatably connected to the crossbar.

[0018] As a preferred technical solution for the aforementioned vehicle, the drive mechanism includes two drive heads, at least one of the other ends of the first support rod and the second support rod is connected to the drive head, and the drive head can slide on the base rod along the first direction to drive the mounting rod to rotate around its own axis.

[0019] The driving mechanism further includes a driving rod, which is disposed between at least one of the other ends of the first support rod and the second support rod and the driving head;

[0020] The drive rod extends along the second direction and is disposed between the two base rods. Each end of the drive rod is provided with a drive head, and the other end of the first support rod is pivotally connected to the middle of the drive rod.

[0021] As a preferred technical solution of the above-mentioned vehicle, the drive mechanism further includes a drive shaft and a helical groove. The drive shaft is fixed on one of the drive head and the mounting rod and extends along the second direction. The helical groove is disposed on the other of the drive head and the mounting rod and extends helically along the first direction. The drive shaft is slidably inserted into the helical groove.

[0022] The bottom rod has a sliding groove extending along the first direction, and the drive shaft is inserted into the sliding groove;

[0023] The extension length of the groove along the first direction is greater than the extension length of the spiral groove along the first direction.

[0024] As a preferred technical solution for the aforementioned vehicle, there are two first support rods, which are arranged side by side with a gap between them. The second support rod passes through the gap between the two first support rods and is pivotally connected to the two first support rods through a pin.

[0025] As a preferred embodiment of the aforementioned vehicle, the vehicle further includes:

[0026] The push handle assembly has its rear end and the second support rod pivotally connected to it, with the pivot point between the rear end of the support assembly and the push handle assembly being higher than the pivot point between the second support rod and the push handle assembly. When the push handle assembly moves toward the support assembly, the support assembly moves toward the base frame assembly. The first support rod and / or the second support rod push the drive mechanism to slide relative to the base frame assembly, thereby driving the moving wheel assembly to rotate.

[0027] The beneficial effects of this utility model are:

[0028] The carrier provided by this utility model allows the moving wheel assembly to rotate and fold together with the base frame assembly when the load-bearing component moves closer to the base frame assembly. This results in a flat, neat, and compact overall structure after folding, taking up little space and making it easy to store at home and carry when going out, providing a good user experience. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of the vehicle provided in the specific embodiment of this utility model in the deployed state;

[0030] Figure 2This is a structural schematic diagram of the vehicle portion provided in a specific embodiment of this utility model;

[0031] Figure 3 This is a side view of the folding steps of the vehicle provided in a specific embodiment of this utility model;

[0032] Figure 4 This is an isometric drawing of the folding steps of the vehicle provided in a specific embodiment of this utility model.

[0033] In the picture:

[0034] 100. Load-bearing components;

[0035] 201. First support rod; 202. Second support rod;

[0036] 301. Base rod; 302. Crossbar; 303. Mounting rod; 304. First mounting seat; 305. Front wheel; 3051. Front wheel bracket; 3052. Front wheel body; 306. Second mounting seat; 307. Rear wheel; 3071. Rear wheel bracket; 3072. Rear wheel body; 308. Spiral groove; 309. Slide groove;

[0037] 401. Drive rod; 402. Drive head.

[0038] 501. Grip; 502. First putter; 503. Second putter. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] This embodiment provides a vehicle, which can be, but is not limited to, a stroller or a trailer. This embodiment uses a stroller as an example for explanation, specifically a children's stroller. Figure 1 As shown, the vehicle includes a base frame assembly, a caster wheel assembly, a load-bearing assembly 100, and a linkage assembly. The caster wheel assembly is rotatably connected to the base frame assembly. The load-bearing assembly 100 is positioned above the base frame assembly and is used for users such as infants or children to sit on. The load-bearing assembly 100 can be, but is not limited to, a seat, a seat cushion, or a seat. The linkage assembly is positioned between the load-bearing assembly 100 and the caster wheel assembly. When the load-bearing assembly 100 moves closer to the base frame assembly, the linkage assembly causes the caster wheel assembly to rotate and fold up to be coplanar with the base frame assembly. When folded, the vehicle has a flat, neat, and compact overall structure, occupies little space, is easy to store at home and carry when traveling, and provides a good user experience.

[0044] It should be noted that the movable wheel assembly can rotate inwards to fold into a plane coplanar with the base frame assembly, or it can rotate outwards to fold into a plane coplanar with the base frame assembly. Both rotation methods can achieve the flattening and folding of the trolley. In this embodiment, the movable wheel assembly rotates inwards to fold, which saves more space and reduces the volume after folding compared to rotating outwards. Here, "inwards" and "outwards" are used with reference to the space where the trolley body is located.

[0045] The linkage assembly includes a connected folding mechanism and a drive mechanism. The folding mechanism is positioned between the support assembly 100 and the base frame assembly, while the drive mechanism is positioned between the base frame assembly and the moving wheel assembly. When the support assembly 100 moves closer to the base frame assembly, the folding mechanism changes from an unfolded state to a folded state, simultaneously driving the drive mechanism to move and rotate the moving wheel assembly to fold it up until it is coplanar with the base frame assembly. The folding mechanism and the drive mechanism together achieve the linkage action between the support assembly 100 and the moving wheel assembly. The transmission structure is compact and precise, resulting in stable and highly reliable movement.

[0046] The folding mechanism includes a first support rod 201 and a second support rod 202 pivotally connected in an X-shape. One end of the first support rod 201 is movably connected to the front end of the support assembly 100, and one end of the second support rod 202 is movably connected to the rear end of the support assembly 100. At least one of the other ends of the first support rod 201 and the second support rod 202 is movably connected to a drive mechanism. The other end of the first support rod 201 and the second support rod 202 that is not connected to the drive mechanism is movably connected to a base frame assembly. The drive mechanism is movably connected to the base frame assembly. The X-shaped folding mechanism has a compact structure and a small folded size, making it suitable for use on strollers.

[0047] In this embodiment, one of the other ends of the first support rod 201 and the second support rod 202 is movably connected to the drive mechanism, and the other is movably connected to the base frame assembly. Specifically, the other end of the first support rod 201 can be movably connected to the drive mechanism, and the other end of the second support rod 202 can be movably connected to the base frame assembly. When the bearing assembly 100 moves closer to the base frame assembly, the X-shaped cross-pivoted first support rod 201 and the second support rod 202 gradually move closer to the base frame assembly. During the moving-close process, the other end of the first support rod 201 drives the drive mechanism to move, thereby driving the moving wheel assembly to rotate and fold until it is coplanar with the base frame assembly. The other end of the second support rod 202 rotates or slides relative to the base frame assembly until the folding mechanism is fully folded. Of course, the other end of the second support rod 202 can also be movably connected to the drive mechanism, and the other end of the first support rod 201 can be movably connected to the base frame assembly. The linkage process is similar to the above process. In other embodiments, the other end of the first support rod 201 and the other end of the second support rod 202 may be movably connected to the drive mechanism. In this structure, when the bearing assembly 100 moves closer to the base frame assembly, the other end of the first support rod 201 and the other end of the second support rod 202 respectively drive the drive mechanism to move so as to drive the moving wheel assembly to rotate so as to retract to be coplanar with the base frame assembly.

[0048] In this embodiment, two first support rods 201 are provided, arranged side by side with a gap between them. A second support rod 202 passes through the gap between the two first support rods 201 and is pivotally connected to the two first support rods 201 via a pin. This structure can improve the motion stability and structural strength of the folding mechanism, thereby improving the reliability and service life of the folding mechanism.

[0049] The base frame assembly includes two base rods 301 extending along a first direction ab and spaced apart along a second direction cd. A drive mechanism is movably connected to the base rods 301. The moving wheel assembly includes two sets of wheels respectively located on both sides of the base frame assembly along the second direction cd. Each set of moving wheel assemblies includes a wheel frame, a front wheel 305 assembly fixed to the front of the wheel frame, and a rear wheel 307 assembly fixed to the rear of the wheel frame. The drive mechanism can drive the wheel frame to rotate relative to the base rods 301, thereby causing the front wheel 305 assembly and the rear wheel 307 assembly to rotate synchronously, achieving the purpose of folding the wheel frame to be coplanar with the base frame assembly. The first direction ab is perpendicular to the second direction cd. In this embodiment, as shown in the figure, the first direction ab is the front-to-back direction when the stroller is in normal use, and the second direction cd is the left-to-right direction when the stroller is in normal use. The base frame assembly serves as the bottom frame of the stroller, stably supporting the linkage assembly and the load-bearing assembly 100 above it.

[0050] like Figure 2 As shown, the wheel frame includes a mounting rod 303 extending along a first direction ab, and the mounting rod 303 is rotatably disposed within the rod cavity of the base rod 301 about its own axis. In this embodiment, the axis of the mounting rod 303 extends collinearly with the axis of the base rod 301.

[0051] The front wheel 305 assembly includes a first mounting base 304 fixed to the front of the mounting rod 303 and a front wheel 305 mounted on the first mounting base 304. The rear wheel 307 assembly includes a second mounting base 306 fixed to the rear of the mounting rod 303 and a rear wheel 307 mounted on the second mounting base 306. Both the first mounting base 304 and the second mounting base 306 are located outside the rod cavity of the base rod 301 to avoid motion interference. During the rotation of the mounting rod 303 around its own axis, it can drive the first mounting base 304 and the second mounting base 306 to rotate together, so that the front wheel 305 and the rear wheel 307 can rotate around the axis of the base rod 301 and retract to be coplanar with the base frame assembly.

[0052] In this embodiment, the front wheel 305 is a swivel wheel, and the rear wheel 307 is a fixed wheel. Specifically, the front wheel 305 includes a front wheel frame 3051 and a front wheel body 3052. The front wheel frame 3051 is rotatably connected to the lower part of the first mounting base 304 about a rotation center line, which extends in the vertical direction. The front wheel body 3052 is rotatably connected to the front wheel frame 3051 via a front wheel axle (not shown). The rear wheel 307 includes a rear wheel frame 3071 and a rear wheel body 3072. The rear wheel frame 3071 is fixed to the lower part of the second mounting base 306. The rear wheel body 3072 is rotatably connected to the rear wheel frame 3071 via a rear wheel axle (not shown). When the trolley is in the unfolded state, both the axle of the front wheel 305 and the axle of the rear wheel 307 extend in the horizontal direction, with the rear wheel axle maintaining its extension in the second direction cd.

[0053] The base frame assembly also includes a crossbar 302 extending along the second direction cd and connected between the two base rods 301. One of the ends of the first support rod 201 and the second support rod 202, which is not connected to the drive mechanism, is rotatably connected to the crossbar 302. In this embodiment, since the other end of the first support rod 201 is movably connected to the drive mechanism, the other end of the second support rod 202 is rotatably connected to the crossbar 302. When the load-bearing assembly 100 moves towards the base frame assembly, the other end of the first support rod 201 drives the drive mechanism to move, thereby driving the moving wheel assembly to rotate and fold up to be coplanar with the base frame assembly. The other end of the second support rod 202 rotates relative to the crossbar 302 until the folding mechanism is fully folded.

[0054] The drive mechanism includes two drive heads 402, corresponding to two mounting rods 303. At least one of the other ends of the first support rod 201 and the second support rod 202 is connected to the drive head 402. The drive head 402 can slide along the first direction ab on the base rod 301 to drive the mounting rod 303 to rotate around its own axis. In this embodiment, the other end of the first support rod 201 is connected to the drive head 402. When the load-bearing assembly 100 moves closer to the base frame assembly, the folding mechanism changes from an unfolded state to a folded state. During this process, the first support rod 201 moves closer to the base frame assembly, causing the drive head 402 to slide along the first direction ab on the base rod 301. The drive head 402 drives the mounting rod 303 to rotate around its own axis, thereby driving the front wheel 305 assembly and the rear wheel 307 assembly to rotate.

[0055] The drive head 402 can be, but is not limited to, a sleeve structure, allowing it to be fitted onto the outside of the base rod 301 and slide relative to it. Specifically, the drive head 402 is a T-shaped sleeve with a first end, a second end, and a third end. The second and third ends are opposite ends of a straight sleeve, and the first end is perpendicularly connected to the straight sleeve. The other end of the first support rod 201 is connected to the first end. The straight sleeve is fitted onto the outside of the base rod 301 with a clearance fit, allowing the drive head 402 to slide back and forth relative to the base rod 301.

[0056] To achieve the driving effect of the drive head 402 on the moving wheel assembly, combined with Figure 1 and Figure 2 As shown, the drive mechanism also includes a drive shaft (not shown) and a helical groove 308. The drive shaft is fixed to one of the drive head 402 and the mounting rod 303 and extends along the second direction cd. The helical groove 308 is disposed on the other of the drive head 402 and the mounting rod 303 and extends helically along the first direction ab. The drive shaft is slidably inserted into the helical groove 308. When the drive head 402 slides back and forth along the first direction ab, the drive shaft can slide within the helical groove 308. Simultaneously, through the sliding engagement between the drive shaft and the helical groove 308, the mounting rod 303 rotates around its own axis. In this embodiment, the drive shaft is fixed to the drive head 402, and the helical groove 308 is disposed on the mounting rod 303.

[0057] The drive mechanism also includes a drive rod 401, which is disposed between at least one of the other ends of the first support rod 201 and the other ends of the second support rod 202 and the drive head 402. Based on the above structure, the drive rod 401, disposed between the other end of the first support rod 201 and the drive head 402, serves as a transmission structure between the first support rod 201 and the drive head 402, transmitting the driving force of the first support rod 201 to the drive head 402 via the transmission rod.

[0058] Specifically, a drive rod 401 extends along the second direction cd and is positioned between two base rods 301. A drive head 402 is located at each end of the drive rod 401, and the other end of the first support rod 201 is pivotally connected to the middle of the drive rod 401. When the first support rod 201 moves closer to the base frame assembly, it rotates relative to the drive rod 401 while simultaneously pushing the drive rod 401 to move along the first direction ab, thereby causing the drive head 402 to slide along the base rod 301.

[0059] In this embodiment, the load-bearing component 100, when folded, is located between the two base rods 301 and is coplanar with the base rods 301. This structure ensures that the overall structure of the vehicle is flatter after folding, making it easier to store and carry. To achieve the above structure, the first end of the T-shaped drive head 402 is vertically downward along the vertical direction and is an L-shaped bend. The first end includes a vertically connected vertical part and a horizontal part. The vertical part is connected between the second end and the third end, and the horizontal part extends along the second direction cd. The drive rod 401 is fixedly connected to the horizontal part. With this structure, when the vehicle is folded, the drive rod 401, part of the first support rod 201, and the second support rod 202 are all located below the plane of the base rod 301, thus providing space for the load-bearing component 100 to be stored coplanar with the base rod 301.

[0060] In this embodiment, two first support rods 201 are provided, arranged side by side with a gap between them. A second support rod 202 passes through the gap between the two first support rods 201 and is pivotally connected to the two first support rods 201 via a pin. This structure can improve the motion stability and structural strength of the folding mechanism, thereby improving the reliability and service life of the folding mechanism.

[0061] The other ends of the two first support rods 201 are pivotally connected to the middle of the drive rod 401, and the two pivot points are spaced apart. The connection method between the first support rods 201 and the drive rod 401 can be, but is not limited to, a sleeve connection. Each support rod can be connected to the drive rod 401 through a T-shaped sleeve, or the two first support rods 201 can be connected to the drive rod 401 through a single sleeve. This embodiment adopts the latter. Specifically, the sleeve is π-shaped, or it can be considered as a structure formed by two T-shaped sleeves connected together. The sleeve includes a first end, a second end, a third end, and a fourth end. The first end and the second end are respectively connected to a first support rod 201. The third end and the fourth end are collinear and serve as opposite ends of a straight sleeve. The straight sleeve is fitted onto the drive rod 401. The first end and the second end are both perpendicularly connected to the straight sleeve and are arranged parallel to each other. The connection between the two first support rods 201 and the drive rod 401 is achieved through a single sleeve, which is simple in structure and ensures the synchronization of movement during the folding process.

[0062] The base rod 301 has a groove 309 extending along the first direction ab, and the drive shaft is inserted into the groove 309. Since the mounting rod 303 rotatably passes through the rod cavity of the base rod 301, the base rod 301 is sleeved on the outside of the helical groove 308, meaning the groove 309 is located outside the helical groove 308. The drive shaft is inserted into both the groove 309 and the helical groove 308. The groove 309 ensures that the drive shaft always slides along the first direction ab, thus constraining and guiding the movement of the drive shaft.

[0063] The extension length of the slide groove 309 along the first direction ab is greater than the extension length of the spiral groove 308 along the first direction ab, so as to ensure the sliding stroke of the drive shaft.

[0064] The carrier in this embodiment also includes a push handle assembly. The rear end of the support assembly 100 and the second support rod 202 are pivotally connected to the push handle assembly, and the pivot point between the rear end of the support assembly 100 and the push handle assembly is higher than the pivot point between the second support rod 202 and the push handle assembly. When the push handle assembly moves towards the support assembly 100, the support assembly 100 moves towards the base frame assembly. The first support rod 201 and / or the second support rod 202 push the drive mechanism to slide relative to the base frame assembly, thereby driving the moving wheel assembly to rotate. When folded, the push handle assembly is located above the plane where the base rod 301 is located.

[0065] The push handle assembly includes a handle 501 and a push rod. The handle 501 is rotatably connected to the top of the push rod. The handle 501 is U-shaped for easy gripping during pushing. When pushing, the handle 501 is approximately horizontal or at a certain angle to the horizontal plane for easy gripping. The top of the push rod is rotatably connected to the middle position of the handle 501, ensuring a uniform and stable pushing force. The rear end of the support assembly 100 and the second support rod 202 are pivotally connected to the push rod. The support assembly 100 is pivotally connected to the lower part of the push rod, and the second support rod 202 is pivotally connected to the bottom of the push rod.

[0066] In this embodiment, the push rod is a telescopic rod, including a first push rod 502 and a second push rod 503 connected vertically. The first push rod 502 is slidably inserted into the rod cavity of the second push rod 503. The handle 501 is rotatably connected to the top of the first push rod 502. The rear end of the bearing assembly 100 and the second support rod 202 are respectively pivotally connected to the second push rod 503. The bearing assembly 100 is pivotally connected to the lower part of the second push rod 503, and the second support rod 202 is pivotally connected to the bottom of the second push rod 503.

[0067] When the stroller needs to be folded, such as Figure 3 and Figure 4 As shown, the handle 501 is flipped downwards until it is coplanar with the push rod and pushed downwards, causing the first push rod 502 to retract into the rod cavity of the second push rod 503. The second push rod 503 is flipped forward counterclockwise. During the rotation of the second push rod 503, the X-shaped folding mechanism is deformed and moves closer to the base frame assembly. During this process, the end of the first support rod 201 away from the bearing assembly 100 pushes the drive rod 401 to move backward along the first direction ab. When the drive rod 401 moves backwards, it drives the drive shaft to slide in the spiral groove 308 through the drive head 402, thereby driving the mounting rod 303 with the spiral groove 308 to rotate around its own axis. While the mounting rod 303 rotates, it drives the front wheel 305 and the rear wheel 307 fixed on the mounting rod 303 to rotate inwards until they are folded together and coplanar with the base frame assembly, thus completing the folding of the trolley.

[0068] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A vehicle, characterized in that, include: Base frame assembly; The movable wheel assembly is rotatably connected to the base frame assembly; A load-bearing component is disposed above the base frame component; A linkage component is disposed between the load-bearing component and the moving wheel assembly. When the load-bearing component moves closer to the base frame assembly, the linkage component causes the moving wheel assembly to rotate so that it retracts to be coplanar with the base frame assembly. The linkage component includes a folding mechanism and a driving mechanism connected together. The folding mechanism is disposed between the bearing component and the base frame component, and the driving mechanism is disposed between the base frame component and the moving wheel component. When the bearing component moves closer to the base frame component, the folding mechanism changes from an unfolded state to a folded state, and at the same time drives the driving mechanism to move so as to drive the moving wheel component to rotate so as to fold it to be coplanar with the base frame component. The folding mechanism includes a first support rod and a second support rod pivotally connected in an X-shape. One end of the first support rod is movably connected to the front end of the load-bearing assembly, and one end of the second support rod is movably connected to the rear end of the load-bearing assembly. At least one of the other ends of the first and second support rods is movably connected to the drive mechanism. The other end of the first and second support rods that is not connected to the drive mechanism is movably connected to the base frame assembly. The drive mechanism is movably connected to the base frame assembly.

2. The vehicle according to claim 1, characterized in that, The base frame assembly includes two base rods extending along a first direction and spaced apart along a second direction, and the drive mechanism is movably connected to the base rods; the movable wheel assembly includes two sets respectively disposed on both sides of the base frame assembly along the second direction, each set of the movable wheel assembly includes a wheel frame, a front wheel assembly fixed to the front of the wheel frame and a rear wheel assembly fixed to the rear of the wheel frame, and the drive mechanism is capable of driving the wheel frame to rotate relative to the base rods, wherein the first direction is perpendicular to the second direction; The load-bearing component, when in the folded state, is located between the two base rods and is coplanar with the base rods.

3. The vehicle according to claim 2, characterized in that, The wheel frame includes a mounting rod extending along the first direction, the mounting rod being rotatably inserted into the rod cavity of the bottom rod about its own axis; The front wheel assembly includes a first mounting seat fixed to the front of the mounting rod and a front wheel mounted on the first mounting seat. The rear wheel assembly includes a second mounting seat fixed to the rear of the mounting rod and a rear wheel mounted on the second mounting seat. Both the first mounting seat and the second mounting seat are located outside the rod cavity of the bottom rod.

4. The vehicle according to claim 2, characterized in that, The base frame assembly also includes a crossbar extending along the second direction and connected between the two base rods, wherein the other end of the first support rod and the other end of the second support rod that is not connected to the drive mechanism is rotatably connected to the crossbar.

5. The vehicle according to claim 3, characterized in that, The driving mechanism includes two driving heads, at least one of the other end of the first support rod and the other end of the second support rod is connected to the driving head, and the driving head can slide on the base rod along the first direction to drive the mounting rod to rotate about its own axis. The driving mechanism further includes a driving rod, which is disposed between at least one of the other ends of the first support rod and the second support rod and the driving head; The drive rod extends along the second direction and is disposed between the two base rods. Each end of the drive rod is provided with a drive head, and the other end of the first support rod is pivotally connected to the middle of the drive rod.

6. The vehicle according to claim 5, characterized in that, The drive mechanism further includes a drive shaft and a helical groove. The drive shaft is fixed on one of the drive head and the mounting rod and extends along the second direction. The helical groove is disposed on the other of the drive head and the mounting rod and extends helically along the first direction. The drive shaft is slidably inserted into the helical groove. The bottom rod has a sliding groove extending along the first direction, and the drive shaft is inserted into the sliding groove; The extension length of the groove along the first direction is greater than the extension length of the spiral groove along the first direction.

7. The vehicle according to claim 1, characterized in that, There are two first support rods, which are arranged side by side with a gap between them. The second support rod passes through the gap between the two first support rods and is pivotally connected to the two first support rods through a pin.

8. The vehicle according to claim 1, characterized in that, The vehicle also includes: The push handle assembly has its rear end and the second support rod pivotally connected to it, with the pivot point between the rear end of the support assembly and the push handle assembly being higher than the pivot point between the second support rod and the push handle assembly. When the push handle assembly moves toward the support assembly, the support assembly moves toward the base frame assembly. The first support rod and / or the second support rod push the drive mechanism to slide relative to the base frame assembly, thereby driving the moving wheel assembly to rotate.

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