Highly foldable storage board cart

Abstract

The application discloses a highly foldable and storaged board cart, which comprises a bottom plate, front casters, rear casters, a board cart handle, a first baffle and two second baffles; the first baffle is located at the rear side of the bottom plate and is rotationally connected with the bottom plate; the two second baffles are respectively located at the left side and the right side of the bottom plate and are rotationally connected with the bottom plate; the front casters, the rear casters and the board cart handle are rotationally connected with the bottom plate; the front casters and the board cart handle are located at the front side of the bottom plate; the rear casters are located at the rear side of the bottom plate; the front casters, the rear casters, the board cart handle, the first baffle and the two second baffles can be rotated relative to the bottom plate to a folded and stored state and an unfolded and used state; when the front casters, the rear casters, the board cart handle, the first baffle and the two second baffles are rotated relative to the bottom plate to the folded and stored state, the front casters, the rear casters, the board cart handle, the first baffle and the two second baffles are folded and stored in the bottom plate. The application has a higher folding and storage degree and a smaller volume of the folded board cart.

Description

Technical Field

[0001] This invention relates to the field of flatbed cart technology, and in particular to a flatbed cart that can be highly folded and stored. Background Technology

[0002] A handcart is a common transport vehicle that can work in places where motor vehicles are inconvenient to use, facilitating the short-distance transport of relatively light goods. Some handcarts, to increase their carrying capacity, have baffles around the bottom. For example, Chinese utility model patent CN206856758U discloses a handcart with foldable baffles, significantly reducing its size and making it easy to store. However, only the baffles can be folded; the casters and handles on the bottom still occupy space, limiting its folding and storage capabilities. Summary of the Invention

[0003] This invention provides a highly foldable cart, whose front wheels, rear wheels, handles, and baffles can all be folded, resulting in a higher degree of folding and storage and a smaller size after folding.

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] An embodiment of the present invention provides a highly foldable cart, including a base plate, front casters, rear casters, a cart handle, a first baffle, and two second baffles. The first baffle is located on the rear side of the base plate and is rotatably connected to the base plate. The two second baffles are located on the left and right sides of the base plate, respectively, and are rotatably connected to the base plate. The front casters, rear casters, and cart handle are all rotatably connected to the base plate. The front casters and cart handle are located on the front side of the base plate, and the rear casters are located on the rear side of the base plate. The front casters, rear casters, cart handle, first baffle, and two second baffles can all rotate relative to the base plate to a folded storage state and an unfolded use state. When the front casters, rear casters, cart handle, first baffle, and two second baffles are all rotated relative to the base plate to the folded storage state, the front casters, rear casters, cart handle, first baffle, and two second baffles are all folded and stored in the base plate.

[0006] In some embodiments, a first locking mechanism is provided on the rear side of the base plate, and a second locking mechanism is provided on both the left and right sides of the base plate; when the first baffle is in a folded storage state and an unfolded use state, the first locking mechanism can restrict the rotation of the first baffle to keep the first baffle in its state; when the second baffle is in a folded storage state and an unfolded use state, the second locking mechanism can restrict the rotation of the second baffle to keep the second baffle in its state.

[0007] In some embodiments, a fixing rod is fixed on both the left and right sides of the base plate, a first hinge seat is fixed at both ends of the first baffle, and a plurality of second hinge seats are fixed on the second baffle. The two first hinge seats are rotatably connected to the two fixing rods respectively, and the second hinge seats are rotatably connected to the fixing rods.

[0008] In some embodiments, the first locking mechanism includes a first elastic protrusion disposed on the base plate and a first limiting hole and a second limiting hole disposed on the first hinge seat; when the first baffle is rotated to the folded storage state, the first elastic protrusion engages with the first limiting hole to restrict the rotation of the first baffle; when the first baffle is rotated to the unfolded use state, the first elastic protrusion engages with the second limiting hole to restrict the rotation of the first baffle; when the first elastic protrusion moves out of the first limiting hole and the second limiting hole, the first locking mechanism releases the restriction on the first baffle;

[0009] The second locking mechanism includes a second elastic protrusion disposed on the base plate and a third limiting hole and a fourth limiting hole disposed on the second hinge seat; when the second baffle is rotated to the folded storage state, the second elastic protrusion engages with the third limiting hole to restrict the rotation of the second baffle; when the second baffle is rotated to the unfolded use state, the second elastic protrusion engages with the fourth limiting hole to restrict the rotation of the second baffle; when the second elastic protrusion moves out of the third limiting hole and the fourth limiting hole, the second locking mechanism releases the restriction on the second baffle.

[0010] In some embodiments, when both the front caster and the trolley handle are rotated to the unfolded state, the lower end of the trolley handle rotates to the rotation path of the front caster and abuts against the front caster to restrict the rotation of the front caster relative to the base plate; when the trolley handle is rotated to the folded storage state, the lower end of the trolley handle rotates to move out of the rotation path of the front caster to release the restriction on the front caster.

[0011] In some embodiments, the surface of the front caster is provided with a protrusion. When both the front caster and the trolley handle are rotated to the unfolded use state, the lower end of the trolley handle rotates onto the rotation path of the front caster and abuts against the protrusion.

[0012] In some embodiments, the cart handle is fixed with a first rotating rod, the first rotating rod is rotatably connected to the base plate, and a pulling mechanism is provided on the first rotating rod, the pulling mechanism being connected to the front caster; during the process of the cart handle rotating from the unfolded use state to the folded storage state, the pulling mechanism can pull the front caster to the folded storage state.

[0013] In some embodiments, the base plate is provided with a movable seat and a transmission mechanism. The movable seat is slidably connected to the base plate, and the transmission mechanism is connected to the rear caster and the movable seat respectively. The movable seat can slide relative to the base plate to a first position and a second position. When the movable seat is in the first position, the transmission mechanism causes the rear caster to be in a folded storage state. When the movable seat is in the second position, the transmission mechanism causes the rear caster to be in an unfolded use state.

[0014] In some embodiments, the movable seat is provided with a locking mechanism, which can lock the movable seat in a first position and a second position, and can also release the movable seat.

[0015] In some embodiments, the transmission mechanism includes a first link, a second link, and a slider, the slider being slidably connected to the base plate, the two ends of the first link being hinged to the movable seat and the slider, respectively, and the second link being hinged to the slider and the rear caster, respectively.

[0016] The present invention has at least the following beneficial effects: the front caster, rear caster, trolley handle, first baffle, and two second baffles of the present invention can all rotate relative to the base plate to a folded storage state and an unfolded use state; when the front caster, rear caster, trolley handle, first baffle, and two second baffles are all rotated relative to the base plate to the unfolded use state, the trolley can be used normally; when the front caster, rear caster, trolley handle, first baffle, and two second baffles are all rotated relative to the base plate to the folded storage state, the front caster, rear caster, trolley handle, first baffle, and two second baffles are all folded and stored in the base plate, the overall degree of folding and storage is higher, making the folded trolley smaller in size and easier to store. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a highly foldable and storable flatbed cart according to one embodiment;

[0018] Figure 2 A schematic diagram of the structure of a highly foldable and stowable flatbed cart as one embodiment, viewed from another perspective;

[0019] Figure 3 This is a schematic diagram of the structure of a highly foldable and storable flatbed cart in a folded state, according to one embodiment.

[0020] Figure 4 This is a structural schematic diagram of a highly foldable and storable flatbed cart in a folded state, from another perspective, according to one embodiment.

[0021] Figure 5 This is a schematic diagram of the structure of the base plate, the first baffle, and the second baffle in one embodiment;

[0022] Figure 6This is an exploded view of the base plate, the first baffle, and the second baffle according to one embodiment;

[0023] Figure 7 This is a partial structural diagram of the base plate according to one embodiment;

[0024] Figure 8 This is a schematic diagram of the structure of the base plate, front casters, and handle of the flatbed cart according to one embodiment;

[0025] Figure 9 This is a schematic diagram of the handrail, front casters, and pulling mechanism of a cart according to one embodiment;

[0026] Figure 10 This is a schematic diagram of the structure of a front caster wheel according to one embodiment;

[0027] Figure 11 This is a schematic diagram of the structure of the base plate, rear casters, movable seat, and transmission mechanism according to one embodiment;

[0028] Figure 12 This is a schematic diagram of the structure of the rear caster, movable seat, and transmission mechanism in one embodiment.

[0029] The attached figures are labeled as follows:

[0030] Base plate 100, sliding groove 101, positioning hole 102, fixing seat 110, fixing rod 120;

[0031] Front caster 201, rear caster 202, bracket 210, reinforcing rib 211, wheel body 220, protrusion 230, second rotating rod 240;

[0032] Movable base 300, positioning pin 310, drive block 320;

[0033] First connecting rod 410, second connecting rod 420, slider 430, structural component 440, guide groove 441;

[0034] Handlebar 500, first rotating rod 510.

[0035] 610 pull rope, 620 cam, 621 rope groove;

[0036] First baffle 710, second baffle 720;

[0037] First locking mechanism 810, first elastic protrusion 811, second locking mechanism 820, second elastic protrusion 821;

[0038] First hinge seat 910, first limiting hole 911, second limiting hole 912, slot 913, notch 914, second hinge seat 920, third limiting hole 921, fourth limiting hole 922. Detailed Implementation

[0039] The present invention is provided below with reference to the accompanying drawings to aid in a full understanding of the various embodiments of the invention as defined by the claims and their equivalents. The description includes various specific details to aid understanding, but these details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the invention.

[0040] In the description of this invention, the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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 limiting this invention.

[0041] It should be understood that when one element (e.g., the first element) is “connected” to another element (e.g., the second element), the element may be directly connected to the other element, or there may be an intervening element (e.g., the third element) between the element and the other element.

[0042] Embodiments of the present invention provide a highly foldable and storable cart, such as... Figure 1-4As shown, the trolley includes a base plate 100, front casters 201, rear casters 202, a trolley handle 500, a first baffle 710, and two second baffles 720. The first baffle 710 is located at the rear of the base plate 100 and is rotatably connected to it. The two second baffles 720 are located on the left and right sides of the base plate 100, respectively, and are rotatably connected to it. The front casters 201, rear casters 202, and trolley handle 500 are all rotatably connected to the base plate 100, with the front casters 201 and trolley handle 500 located at the front of the base plate 100, and the rear casters 202 located at the rear of the base plate 100. The front casters 201, rear casters 202, trolley handle 500, first baffle 710, and two second baffles 720 can all rotate relative to the base plate 100 to a folded storage state and an unfolded use state. When the front caster 201, rear caster 202, trolley handle 500, first baffle 710, and two second baffles 720 are all rotated relative to the base plate 100 to the unfolded use state, the front caster 201 and rear caster 202 can support the base plate 100. The front caster 201 and rear caster 202 can rotate, which can also reduce friction and facilitate pushing the entire trolley. The first baffle 710 and the two second baffles 720 prevent the goods on the base plate 100 from sliding off from the rear, left, and right sides, respectively. The trolley handle 500 can also provide some obstruction to the goods on the base plate 100 from the front. Users can grip the trolley handle 500 to easily push and pull the entire trolley. In this way, the entire trolley is in a normal usable state. When the front caster 201, rear caster 202, trolley handle 500, first baffle 710 and two second baffles 720 are all rotated relative to the base plate 100 to the folded storage state, the front caster 201, rear caster 202, trolley handle 500, first baffle 710 and two second baffles 720 are all folded and stored in the base plate 100. The overall degree of folding and storage is higher, making the folded trolley smaller in size and easier to store.

[0043] In some embodiments, when the front caster 201, rear caster 202, trolley handle 500, first baffle 710, and two second baffles 720 are all rotated relative to the base plate 100 to a folded storage state, the trolley handle 500, first baffle 710, and two second baffles 720 can all be folded and stored on the top surface of the base plate 100, and the front caster 201 and rear caster 202 can all be folded and stored on the bottom surface of the base plate 100, so that the front caster 201 and rear caster 202 do not interfere with the trolley handle 500, first baffle 710, and two second baffles 720.

[0044] Furthermore, such as Figure 3 and Figure 4As shown, when the front caster 201, rear caster 202, trolley handle 500, first baffle 710, and two second baffles 720 are all rotated relative to the base plate 100 to the folded storage state, the two second baffles 720 can be folded tightly against the top surface of the base plate 100, the first baffle 710 can be folded and stored above the second baffles 720, and the trolley handle 500 can be folded and stored above the first baffle 710 and the two second baffles 720, so that the trolley handle 500, the first baffle 710, and the two second baffles 720 are stored in layers, avoiding interference between the trolley handle 500, the first baffle 710, and the two second baffles 720.

[0045] Specifically, the distance from the first baffle 710 to its rotation axis with respect to the base plate 100 can be set to be greater than the distance from the second baffle 720 to its rotation axis with respect to the base plate 100. When both the first baffle 710 and the second baffle 720 are in a folded storage state, the height of the first baffle 710 is higher than the height of the second baffle 720, and the first baffle 710 can be folded and stored above the second baffle 720 accordingly.

[0046] In some embodiments, such as Figure 1 , Figure 5 , Figure 6 and Figure 7 As shown, a first locking mechanism 810 is provided on the rear side of the base plate 100, and second locking mechanisms 820 are provided on both the left and right sides of the base plate 100. When the first baffle 710 is in the folded storage state, the first locking mechanism 810 can restrict the rotation of the first baffle 710, so the first baffle 710 can remain in the folded storage state and will not rotate arbitrarily, which facilitates the transport of the pallet trolley; when the first baffle 710 is in the unfolded use state, the first locking mechanism 810 can also restrict the rotation of the first baffle 710, so the first baffle 710 can remain in the unfolded use state and will not rotate arbitrarily, thus affecting the user's use. Similarly, when the second baffle 720 is in the folded storage state, the second locking mechanism 820 can restrict the rotation of the second baffle 720, thus keeping the second baffle 720 in the folded storage state and preventing it from rotating arbitrarily, which facilitates the transport of the pallet trolley. When the second baffle 720 is in the unfolded use state, the second locking mechanism 820 can also restrict the rotation of the second baffle 720, thus keeping the second baffle 720 in the unfolded use state and preventing it from rotating arbitrarily and affecting user use. The first locking mechanism 810 and the second locking mechanism 820 can also release the restriction on the first baffle 710 and the second baffle 720 respectively, so that both the first baffle 710 and the second baffle 720 can rotate relative to the base plate 100.

[0047] Furthermore, fixing rods 120 are fixed to both the left and right sides of the base plate 100. First hinge seats 910 are fixed to both ends of the first baffle 710, and several second hinge seats 920 are fixed to the second baffle 720. Two first hinge seats 910 are rotatably connected to two fixing rods 120 respectively, thus achieving a rotatable connection between the first baffle 710 and the base plate 100. Similarly, the second hinge seats 920 are rotatably connected to the fixing rods 120, achieving a rotatable connection between the second baffle 720 and the base plate 100. The hinge seats are all rotatably connected to the fixing rods 120, which does not damage the surface structure of the base plate 100. At the same time, the overall structure is more compact, facilitating assembly and disassembly.

[0048] Furthermore, the first locking mechanism 810 includes a first elastic protrusion 811 disposed on the base plate 100 and a first limiting hole 911 and a second limiting hole 912 disposed on the first hinge seat 910. The first elastic protrusion 811 can elastically extend and retract. When the first baffle 710 is rotated to the folded storage state, the first elastic protrusion 811 is engaged in the first limiting hole 911. Without a large external force, the first elastic protrusion 811 is difficult to disengage from the first limiting hole 911, thereby restricting the rotation of the first baffle 710. When the first baffle 710 is rotated to the unfolded use state, the first elastic protrusion 811 is engaged in the second limiting hole 912, which also restricts the rotation of the first baffle 710. When the first baffle 710 is subjected to a large external force and rotates, the first elastic protrusion 811 can retract on its own, thereby moving out of the first limiting hole 911 and the second limiting hole 912. The first locking mechanism 810 then releases the restriction on the first baffle 710, and the first baffle 710 can rotate relative to the base plate 100.

[0049] The second locking mechanism 820 includes a second elastic protrusion 821 disposed on the base plate 100 and a third limiting hole 921 and a fourth limiting hole 922 disposed on the second hinge seat 920. The second elastic protrusion 821 is elastically retractable. When the second baffle 720 is rotated to the folded storage state, the second elastic protrusion 821 engages with the third limiting hole 921. Without a large external force, the second elastic protrusion 821 is difficult to disengage from the third limiting hole 921, thereby restricting the rotation of the second baffle 720. When the second baffle 720 is rotated to the unfolded use state, the second elastic protrusion 821 engages with the fourth limiting hole 922, also restricting the rotation of the second baffle 720. When the second baffle 720 is subjected to a large external force and rotates, the second elastic protrusion 821 can retract on its own, thereby moving out of the third limiting hole 921 and the fourth limiting hole 922. The second locking mechanism 820 then releases the restriction on the second baffle 720, allowing the second baffle 720 to rotate relative to the base plate 100.

[0050] The surfaces of the first elastic protrusion 811 and the second elastic protrusion 821 can both be set to be arc-shaped to make the first elastic protrusion 811 and the second elastic protrusion 821 smoother, so that they can be smoothly inserted into or removed from the corresponding limiting hole.

[0051] In some embodiments, the first hinge seat 910 is provided with a slot 913, and the end of the fixing rod 120 is inserted into the slot 913 and rotatably connected to the first hinge seat 910. This not only makes it difficult for the fixing rod 120 to detach from the first hinge seat 910, improving the stability of the connection, but also reduces the distance between the two first hinge seats 910, thereby reducing the space occupied by the trolley. The top surface of the first hinge seat 910 is provided with a notch 914 communicating with the slot 913. When the first baffle 710 is in the folded storage state, the notch 914 can avoid the fixing rod 120, so as to ensure that the first baffle 710 is stably in the folded storage state.

[0052] In some embodiments, such as Figure 1 , Figure 8 , Figure 9 and Figure 10 As shown, when both the front caster 201 and the trolley handle 500 are rotated to the unfolded state, the lower end of the trolley handle 500 rotates to the rotation path of the front caster 201 and abuts against the front caster 201 to restrict the rotation of the front caster 201 relative to the base plate 100. In this way, when the trolley handle 500 is in the unfolded state, the front caster 201 can be locked in the unfolded state at the same time, ensuring that the front caster 201 is stably in the unfolded state. When the trolley handle 500 is rotated to the folded storage state, the lower end of the trolley handle 500 rotates to move out of the rotation path of the front caster 201, and the restriction on the front caster 201 can be released, allowing the front caster 201 to rotate freely relative to the base plate 100.

[0053] Furthermore, the surface of the front caster 201 is provided with a protrusion 230. When both the front caster 201 and the trolley handle 500 are rotated to the unfolded use state, the lower end of the trolley handle 500 rotates to the rotation path of the front caster 201 and abuts against the protrusion 230. The presence of the protrusion 230 makes the thickness of the protrusion 230 of the front caster 201 greater. The protrusion 230 will bear the squeezing force and friction of the trolley handle 500. The protrusion 230 has greater structural strength and is more wear-resistant, which can extend its service life.

[0054] Furthermore, the surface of the protrusion 230 is set to be arc-shaped, so the surface of the protrusion 230 is smoother, which can reduce the friction between the protrusion 230 and the trolley handle 500 when the trolley handle 500 rotates, making it easier for the trolley handle 500 to rotate smoothly.

[0055] In some embodiments, the trolley handle 500 is fixed with a first rotating rod 510, which is rotatably connected to the base plate 100. A pulling mechanism is provided on the first rotating rod 510, and the pulling mechanism is connected to the front caster 201. During the process of rotating the trolley handle 500 from an unfolded state to a folded state, the pulling mechanism can pull the front caster 201 to the folded state. Therefore, when the user wants to fold both the trolley handle 500 and the front caster 201, the user can rotate the trolley handle 500, and under the action of the pulling mechanism, the front caster 201 can fold and be stored automatically. This saves the user the trouble of rotating the front caster 201 separately, making it more convenient for the user.

[0056] It should be noted that, due to the limited width of the front caster 201, the restriction on the front caster 201 is not lifted only when the trolley handle 500 is rotated to the folded storage state. During the process of rotating the trolley handle 500 from the unfolded use state to the folded storage state, as long as it is rotated to a certain position, it will move out of the rotation path of the front caster 201, and the pulling mechanism can start to pull the front caster 201.

[0057] In this embodiment, a rotating hole can be provided on the base plate 100, and the first rotating rod 510 can be inserted into the rotating hole and rotated in the rotating hole, thereby realizing the rotating connection between the first rotating rod 510 and the base plate 100.

[0058] Furthermore, the pulling mechanism includes a pull rope 610, one end of which is mounted on the first rotating rod 510, and the other end is fixed to the front caster 201. The pull rope 610 can adjust the angle of its pulling force to keep pulling the front caster 201 while the trolley handle 500 is rotating. Simultaneously, the pull rope 610 has a certain degree of elasticity and can adaptively extend and retract according to the force applied. When the trolley handle 500 has already rotated and has not moved out of the rotation path of the front caster 201, the pull rope 610 will be stretched, but will still maintain its connection with the first rotating rod 510 and the front caster 201.

[0059] Furthermore, the pulling mechanism also includes a cam 620, which is fixed to the first rotating rod 510 and can be coaxially arranged with the first rotating rod 510. The circumferential surface of the cam 620 is provided with a rope groove 621. One end of the pull rope 610 near the first rotating rod 510 is fixed to the cam 620, and during the rotation of the cam 620, the pull rope 610 can be wound in the rope groove 621. The rope groove 621 plays a positioning role for the pull rope 610, which can avoid the problem of the first rotating rod 510 not rotating smoothly due to the pull rope 610 being wound on it.

[0060] In some embodiments, the rotation axis of the trolley handle 500 and the base plate 100 is perpendicular to the rotation axis of the front caster 201 and the base plate 100. When the front caster 201 is in the unfolded use state, the trolley handle 500 can rotate onto or out of the rotation path of the front caster 201. The rotation axis of the trolley handle 500 and the base plate 100 can be parallel to the width direction of the base plate 100, and the rotation axis of the front caster 201 and the base plate 100 can be parallel to the length direction of the base plate 100.

[0061] In some embodiments, the base plate 100 includes a fixed seat 110, and the cart handle 400 and front caster wheel 201 are rotatably connected to the fixed seat 110. In the above embodiment, the first rotating rod 510 is rotatably connected to the fixed seat 110, the cam 620 can be disposed in the fixed seat 110, and the pull rope 610 can extend out of the fixed seat 110 and be connected to the front caster wheel 201. In the above embodiment, the fixed rod 120 can be connected to the fixed seat 110.

[0062] In some embodiments, the front caster 201 includes a bracket 210 and a wheel body 220. The wheel body 220 is rotatably connected to the bracket 210, and the bracket 210 is rotatably connected to the base plate 100. When the bracket 210 rotates relative to the base plate 100, the entire front caster 201 can be in an unfolded state or folded and stored in the base plate 100. When the front caster 201 is in the unfolded state, the trolley handle 500 can rotate to the rotation path of the bracket 210 and abut against the bracket 210. The trolley handle 500 can also rotate to move out of the rotation path of the bracket 210 to release the restriction on the front caster 201.

[0063] Accordingly, the protrusion 230 in the above embodiment is provided on the side of the bracket 210. The pull rope 610 is connected to the bracket 210. A second rotating rod 240 is fixed on the bracket 210, and the second rotating rod 240 is rotatably connected to the fixed base 110.

[0064] In some embodiments, such as Figure 1 , Figure 11 and Figure 12As shown, a movable seat 300 and a transmission mechanism 400 are provided on the base plate 100. The movable seat 300 is slidably connected to the base plate 100. The transmission mechanism 400 is connected to both the rear caster 202 and the movable seat 300. When the movable seat 300 slides, it drives the transmission mechanism 400 to move, which in turn drives the rear caster 202 to rotate. The movable seat 300 can slide relative to the base plate 100 to a first position or a second position. When the movable seat 300 is in the first position, the transmission mechanism 400 folds the rear caster 202 and stores it in the base plate 100. When the movable seat 300 is in the second position, the transmission mechanism 400 unfolds the rear caster 202 for use. At this time, the rear caster 202 can support the base plate 100 and, when the base plate 100 moves, its rotation reduces friction, allowing the user to use the cart normally.

[0065] Furthermore, the movable seat 300 is equipped with a locking mechanism, which can lock the movable seat 300 to a first position and a second position, and can also release the movable seat 300. When the locking mechanism locks the movable seat 300 to the first position, the movable seat 300 cannot move relative to the base plate 100, and the rear casters 202 can remain folded and stored in the base plate 100. The rear casters 202 are not easily restored to the unfolded state on their own, which facilitates the transport of the trolley. When the locking mechanism locks the movable seat 300 to the second position, the movable seat 300 also cannot move relative to the base plate 100, and the rear casters 202 can remain unfolded and are not easily restored to the folded state on their own, allowing the user to use the trolley stably. When the locking mechanism releases the movable seat 300, the movable seat 300 can move freely relative to the base plate 100 to the first position or the second position, allowing the user to switch the state of the rear casters 202.

[0066] Furthermore, the base plate 100 is provided with a sliding groove 101, and the movable seat 300 is disposed in the sliding groove 101 and can slide along the sliding groove 101, thereby realizing a sliding connection between the movable seat 300 and the base plate 100. The sliding groove 101 serves as a guide and limiter for the movable seat 300, allowing the movable seat 300 to remain sliding along the sliding groove 101.

[0067] The sliding groove 101 can be formed by the inherent reinforcing ribs on the base plate 100, which can both strengthen the structural strength of the base plate 100 and form the sliding groove 101 in this embodiment. Specifically, the reinforcing ribs can be set as two limiting plates protruding from the base plate 100, with the two limiting plates parallel to each other, so as to form the sliding groove 101 between the two limiting plates.

[0068] Furthermore, the locking mechanism includes a positioning pin 310 that is elastically retractable relative to the movable seat 300. The inner walls of the sliding grooves 101 located in the first and second positions are both provided with positioning holes 102 that are adapted to the positioning pin 310. When the positioning pin 310 is inserted into the positioning hole 102 in the first position, it restricts the sliding of the movable seat 300 relative to the base plate 100, allowing the rear casters 202 to remain folded and stored in the base plate 100. When the positioning pin 310 is inserted into the positioning hole 102 in the second position, it also restricts the sliding of the movable seat 300 relative to the base plate 100, allowing the rear casters 202 to remain in an unfolded state. Since the positioning pin 310 is elastically retractable, it can retract the movable seat 300, allowing the positioning pin 310 to move out of the positioning hole 102. Consequently, the positioning pin 310 no longer restricts the sliding of the movable seat 300 relative to the base plate 100.

[0069] A positioning pin hole can be provided on the side of the movable seat 300. The positioning pin 310 is set in the positioning pin hole and can move along the positioning pin hole. An elastic element is provided in the positioning pin hole. The elastic element abuts against the bottom wall of the positioning pin hole and the positioning pin 310, so that the positioning pin 310 can elastically extend and retract relative to the movable seat 300.

[0070] Furthermore, the surface of the movable base 300 is provided with a drive block 320 connected to the positioning pin 310. The drive block 320 and the movable base 300 are slidably connected along the extension and retraction direction of the positioning pin 310. The user can move the drive block 320 to extend and retract the positioning pin 310 relative to the movable base 300, thereby controlling whether the positioning pin 310 is inserted into the positioning hole 102, so as to facilitate the user to actively switch the state of the rear caster 202.

[0071] A receiving groove can be provided on the surface of the movable seat 300. The receiving groove is connected to the positioning pin hole. A part of the drive block 320 is located in the receiving groove and connected to the positioning pin 310. The drive block 320 can move in the receiving groove along the extension and retraction direction of the positioning pin 310, thereby controlling the extension and retraction state of the positioning pin 310.

[0072] In some embodiments, the transmission mechanism 400 includes a first connecting rod 410, a second connecting rod 420, and a slider 430. The slider 430 is slidably connected to the base plate 100. The two ends of the first connecting rod 410 are hinged to the movable seat 300 and the slider 430, respectively. The second connecting rod 420 is hinged to the slider 430 and the rear caster 202, respectively. When the movable seat 300 moves, the first connecting rod 410 can pull the slider 430, which in turn pulls the second connecting rod 420, which in turn drives the rear caster 202 to rotate.

[0073] Furthermore, the rotation axes of the rear caster 202 and the base plate 100, the second connecting rod 420 and the rear caster 202, the slider 430 and the second connecting rod 420, and the sliding direction of the movable seat 300 relative to the base plate 100 are all parallel to the first direction. The sliding direction of the slider 430 relative to the base plate 100 is parallel to the second direction. The rotation axes of the movable seat 300 and the first connecting rod 410, and the slider 430 and the first connecting rod 410, are all perpendicular to the base plate 100. Both the first and second directions are parallel to the base plate 100 and perpendicular to each other. Since the rotation axis of the slider 430 and the second connecting rod 420 is perpendicular to the rotation axis of the slider 430 and the first connecting rod 410, when the movable seat 300 is not moving, the slider 430 cannot slide relative to the base plate 100 on its own, and the rear caster 202 can maintain its state.

[0074] In this embodiment, the first direction can be parallel to the length direction of the base plate 100, the second direction can be parallel to the width direction of the base plate 100, and the rear caster 202 can be deflected from the side of the base plate 100 toward the center of the base plate 100 so as to be folded and stored in the base plate 100.

[0075] In some embodiments, a guide groove 441 is provided on the base plate 100, and the slider 430 is disposed in the guide groove 441 and can slide along the guide groove 441, thereby realizing the sliding connection between the slider 430 and the base plate 100.

[0076] In this embodiment, the guide groove 441 can be provided on the structural component 440, and the structural component 440 can be integrally connected with the base plate 100 or fixed on the base plate 100.

[0077] In some embodiments, both the movable seat 300 and the transmission mechanism 400 are disposed on the bottom surface of the base plate 100. This allows the top surface of the base plate 100 to remain flat and does not occupy space on the top surface of the base plate 100, thereby increasing the loading capacity of goods. Simultaneously, when the movable seat 300 is in the first position, the transmission mechanism 400 folds and stores the rear casters 202 on the bottom surface of the base plate 100. This shortens the distance between the movable seat 300 and the rear casters 202, facilitating the configuration of the transmission mechanism 400.

[0078] In some embodiments, the rear caster 202 includes a bracket 210 and a wheel body 220. The wheel body 220 is rotatably connected to the bracket 210, and the bracket 210 is rotatably connected to the base plate 100. The transmission mechanism 400 is connected to the bracket 210. When the bracket 210 rotates relative to the base plate 100, the entire rear caster 202 can be in an unfolded state or folded and stored in the base plate 100.

[0079] When the rear caster 202 is in the unfolded state, the axis of the wheel body 220 can be parallel to the base plate 100. When the rear caster 202 is folded and stored in the base plate 100, the axis of the wheel body 220 can be perpendicular to the base plate 100.

[0080] Furthermore, multiple reinforcing ribs 211 are provided on the inner side of the bracket 210 (the side closest to the center of the base plate 100) to enhance the structural strength of the bracket 210.

[0081] In some embodiments, the movable seat 300 can be connected to two transmission mechanisms 400, which are respectively connected to two opposing rear casters 202. By sliding the movable seat 300, the two rear casters 202 can be simultaneously folded and stored in the base plate 100 or in an unfolded state.

[0082] The terms and words used in the foregoing description and claims are not limited to their literal meaning, but are merely used by the applicant to enable a clear and consistent understanding of the invention. Therefore, those skilled in the art will understand that the foregoing description of various embodiments of the invention is illustrative only and not intended to limit the invention as defined by the appended claims and their equivalents.

Claims

1. A highly foldable and foldable cart, characterized in that: The device includes a base plate, front casters, rear casters, a trolley handle, a first baffle, and two second baffles. The first baffle is located at the rear of the base plate and is rotatably connected to it. The two second baffles are located on the left and right sides of the base plate, respectively, and are rotatably connected to it. The front casters, rear casters, and trolley handle are all rotatably connected to the base plate. The front casters and trolley handle are located at the front of the base plate, and the rear casters are located at the rear of the base plate. The front casters, rear casters, trolley handle, first baffle, and two second baffles can all rotate relative to the base plate to a folded storage state and an unfolded use state. When the front casters, rear casters, trolley handle, first baffle, and two second baffles are all rotated relative to the base plate to the folded storage state, they are all folded and stored within the base plate. The base plate is provided with a movable seat and a transmission mechanism. The movable seat is slidably connected to the base plate, and the transmission mechanism is connected to the rear caster and the movable seat respectively. The movable seat can slide relative to the base plate to a first position and a second position. When the movable seat is in the first position, the transmission mechanism causes the rear caster to be in a folded storage state. When the movable seat is in the second position, the transmission mechanism causes the rear caster to be in an unfolded use state. The transmission mechanism includes a first connecting rod, a second connecting rod, and a slider. The slider is slidably connected to the base plate. The two ends of the first connecting rod are respectively hinged to the movable seat and the slider. The second connecting rod is respectively hinged to the slider and the rear caster. The rotation axis of the rear caster and the base plate, the rotation axis of the second link and the rear caster, the rotation axis of the slider and the second link, and the sliding direction of the moving seat relative to the base plate are all parallel to the first direction; the sliding direction of the slider relative to the base plate is parallel to the second direction; the rotation axis of the moving seat and the first link, and the rotation axis of the slider and the first link are all perpendicular to the base plate; the first direction and the second direction are both parallel to the base plate and perpendicular to each other.

2. The highly foldable and foldable cart according to claim 1, characterized in that: A first locking mechanism is provided on the rear side of the base plate, and a second locking mechanism is provided on both the left and right sides of the base plate. When the first baffle is in a folded storage state and an unfolded use state, the first locking mechanism can restrict the rotation of the first baffle to keep the first baffle in its state. When the second baffle is in a folded storage state and an unfolded use state, the second locking mechanism can restrict the rotation of the second baffle to keep the second baffle in its state.

3. The highly foldable and foldable cart according to claim 2, characterized in that: The base plate is fixed with a fixing rod on both the left and right sides. The first baffle is fixed with a first hinge seat at both ends. The second baffle is fixed with a plurality of second hinge seats. The two first hinge seats are rotatably connected to the two fixing rods respectively. The second hinge seats are rotatably connected to the fixing rods.

4. The highly foldable and foldable cart according to claim 3, characterized in that: The first locking mechanism includes a first elastic protrusion disposed on the base plate and a first limiting hole and a second limiting hole disposed on the first hinge seat; when the first baffle rotates to the folded storage state, the first elastic protrusion engages with the first limiting hole to restrict the rotation of the first baffle; when the first baffle rotates to the unfolded use state, the first elastic protrusion engages with the second limiting hole to restrict the rotation of the first baffle; when the first elastic protrusion moves out of the first limiting hole and the second limiting hole, the first locking mechanism releases the restriction on the first baffle; The second locking mechanism includes a second elastic protrusion disposed on the base plate and a third limiting hole and a fourth limiting hole disposed on the second hinge seat; when the second baffle is rotated to the folded storage state, the second elastic protrusion engages with the third limiting hole to restrict the rotation of the second baffle; when the second baffle is rotated to the unfolded use state, the second elastic protrusion engages with the fourth limiting hole to restrict the rotation of the second baffle; when the second elastic protrusion moves out of the third limiting hole and the fourth limiting hole, the second locking mechanism releases the restriction on the second baffle.

5. The highly foldable and foldable cart according to claim 1, characterized in that: When both the front caster and the trolley handle are rotated to the unfolded state, the lower end of the trolley handle rotates to the rotation path of the front caster and abuts against the front caster to restrict the rotation of the front caster relative to the base plate; when the trolley handle is rotated to the folded storage state, the lower end of the trolley handle rotates to move out of the rotation path of the front caster to release the restriction on the front caster.

6. The highly foldable and foldable cart according to claim 5, characterized in that: The surface of the front caster is provided with a protrusion. When both the front caster and the trolley handle are rotated to the unfolded use state, the lower end of the trolley handle rotates to the rotation path of the front caster and abuts against the protrusion.

7. The highly foldable and foldable cart according to claim 5, characterized in that: The handcart handle is fixed with a first rotating rod, which is rotatably connected to the base plate. A pulling mechanism is provided on the first rotating rod, and the pulling mechanism is connected to the front caster. During the process of rotating the handcart handle from the unfolded use state to the folded storage state, the pulling mechanism can pull the front caster to the folded storage state.

8. The highly foldable and foldable cart according to claim 1, characterized in that: The movable seat is equipped with a locking mechanism, which can lock the movable seat in a first position and a second position, and can also release the movable seat.

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