Cart suitable for storage box

Abstract

The invention discloses a cart suitable for a storage box, and the cart comprises a walking assembly which comprises rotatable wheels; the bottom plate assembly comprises a bottom plate, the bottom plate is connected with the walking assembly, and at least part of the bottom plate assembly is arranged on the upper side of the walking assembly; the cart further comprises a first supporting plate, and the first supporting plate at least has a first state relative to the bottom plate. When the first supporting plate is in the first state, the first supporting plate is connected to the bottom plate through at least one storage box. A single-layer cart is switched into a cart with at least two layers by adopting the storage box, so that the diversity of functions of the cart is increased.

Description

Technical Field

[0001] The present application relates to a tool box system, and in particular to a cart suitable for storing boxes. Background Art

[0002] A cart in the related art. When a user goes to work at a workplace, he generally needs to carry tools to be used. In order to facilitate the user to carry and transport the above tools, the user generally uses a storage box to store the above tools. The charger, battery pack, tool accessories, tools, etc. can all be placed in the storage box. However, when the tools, etc. are placed in the storage box, the storage box will inevitably be very heavy during the transportation process, which will cause difficulty for the user to carry. Therefore, the user often needs to use a cart to carry the storage box. However, the carts currently on the market are basically very large, which is inconvenient for users to transport.

[0003] This section provides background information related to the present application which is not necessarily prior art. Summary of the invention

[0004] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a single-layer cart that can be switched to at least a two-layer cart using a storage box.

[0005] In order to achieve the above objectives, the present application adopts the following technical solution: a cart suitable for storage boxes, comprising: a walking assembly, including rotatable wheels; a base assembly, including a base, and the base is connected to the walking assembly; the cart also includes a first support plate, and the first support plate has at least a first state relative to the base; when the first support plate is in the first state, the first support plate is connected to the base through at least one storage box.

[0006] In some embodiments, the first support plate has a second state and a third state relative to the base plate. When the first support plate is in the second state, the first support plate is mounted on the base plate and the first support plate is at least partially in contact with the base plate. When the first support plate is in the third state, the first support plate is separated from the base plate.

[0007] In some embodiments, the cart also includes a pull rod assembly connected to the base plate assembly, the pull rod assembly includes a pull rod connected to the base plate, the pull rod is configured to move relative to the base plate, the pull rod has at least two states relative to the base plate, namely a storage state and a use state, when the pull rod is in the storage state, the pull rod is at least partially inside the base plate, and the pull rod is lower than the upper surface of the base plate; when the pull rod is in the use state, the pull rod is configured to be connected to the first support plate.

[0008] In some embodiments, the tie rod further has a separation state relative to the base plate, and when the tie rod is in the separation state, the tie rod is configured to allow separation from the base plate.

[0009] In some embodiments, the three states of the first support plate relative to the base plate are configured to be used in conjunction with the two states of the pull rod relative to the base plate, respectively.

[0010] In some embodiments, the cart further comprises a drawbar assembly connected to the base plate assembly, the drawbar assembly comprises a drawbar connected to the base plate, and the first support plate is connected to the base plate through a storage box and a distance between the drawbars.

[0011] In some embodiments, the cart also includes a pull rod assembly connected to the base plate assembly, the pull rod assembly includes a pull rod connected to the base plate, the cart also includes a first connecting assembly connecting the pull rod to the first support plate, the first connecting assembly includes a first connecting member and a second connecting member, when the first connecting member and the second connecting member are connected, the first support plate is fixedly connected to the pull rod, when the first connecting member and the second connecting member are separated, the first support plate is separated from the pull rod, and the first support plate and the pull rod can both move relative to the base plate.

[0012] In some embodiments, the first connecting component also includes a fastener that can cooperate with the first connecting member and the second connecting member, the first connecting member is connected to the pull rod, the second connecting member is connected to the first support plate, a first connecting hole is formed on the first connecting member, and a second connecting hole is formed on the second connecting member. The fastener passes through the first connecting hole and the second connecting hole, thereby connecting the first support plate to the pull rod.

[0013] In some embodiments, the cart further comprises a drawbar assembly connected to the base plate assembly, wherein the drawbar assembly comprises a drawbar connected to the base plate, and a bracket detachably connected to the drawbar.

[0014] In some embodiments, the first support plate is connected to the base plate via at least two storage boxes.

[0015] In some embodiments, the cart further comprises a second connection assembly, and the storage box is mounted to the base plate via the second connection assembly.

[0016] In some embodiments, the first support plate is mounted to the storage box via a second connecting assembly.

[0017] In some embodiments, the cart further includes a second connecting assembly, and the first supporting plate is connected to the bottom plate via the second connecting assembly.

[0018] In some embodiments, the cart further includes at least one external attachment, the external attachment including a mounting portion and a connecting portion, the mounting portion being configured to detachably connect an item, and the connecting portion being configured to be mounted on the cart and / or the storage box.

[0019] In some embodiments, the cart further includes an external hang-on assembly, which includes an external hang-on part and an intermediate part, and the external hang-on part is mounted to the storage box and / or the connecting section of the first support plate through the intermediate part.

[0020] In some embodiments, the cart further includes an external hanging component, the external hanging component includes a fixing member, and the fixing member passes through the connecting portion to install the external hanging component to the first support plate.

[0021] In some embodiments, items can be attached to the attachment.

[0022] In some embodiments, the hanger is mounted to the outer periphery of the first support plate.

[0023] In some embodiments, the storage box is detachably connected to the bottom plate, the first support plate is detachably connected to the bottom plate through the storage box, and an upper side of the first support plate forms a space for storing items.

[0024] In some embodiments, the first support plate is detachably connected to the bottom plate via at least one storage box, and the storage box is formed with an opening that can be opened or closed.

[0025] The benefit of the present application is that the present application can use a storage box to switch a single-layer cart into at least a two-layer cart, thereby increasing the diversity of the cart. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a perspective view of a cart that can be adapted for use with a storage box in the present application; Figure 2 yes Figure 1 A three-dimensional image of the center cart from another perspective; Figure 3 yes Figure 1 Stereoscopic images of other views of the center cart; Figure 4 yes Figure 1 A perspective view of the items being removed from the center cart; Figure 5 yes Figure 4 A three-dimensional image of the center cart from another perspective; Figure 6 yes Figure 4 A perspective view of the middle external part being separated from the cart, when the cart is in the first state; Figure 7 yes Figure 6 A perspective view of the first support plate being separated from the pull rod and the storage, and the cart is in the third state at this time; Figure 8 yes Figure 6 A perspective view of the first support plate being directly connected to the bottom plate, the cart is in the second state, and the wheels are in the extended state; Fig. 9 yes Figure 6 A three-dimensional view of the cart after the first support plate is removed, at which time the cart is in a third state, the pull rod is in a use state, and the drive member is in a connected state; Fig.10 yes Fig. 9 A three-dimensional view of the cart when the middle pull rod is in the stowed state and the drive member is in the hidden state; Fig.11 yes Figure 1 A three-dimensional view of the middle cart with the pull rod in the stowed state, the cart in the second state, and the wheels in the folded state; Fig.12 yes Fig.11 A perspective view of the mid-sized cart from another angle, with the wheels folded; Fig.13 yes Fig.11 A disassembled view of the locking device on the mid-trolley; Fig.14 yes Figure 1 A three-dimensional view of the first support plate; Fig.15 is a second embodiment in which the first support plate is connected to the bottom plate via a storage box; Fig.16 yes Fig.15 A three-dimensional image of a cart with items removed; Fig.17 yes Fig.16 A three-dimensional diagram of the first support plate being separated from the bottom plate; Fig.18 yes Fig.15 A three-dimensional diagram of the second first support plate; Fig.19 yes Fig. 9 A three-dimensional diagram of the middle tie rod in a separated rotation state; Fig. 20 is a three-dimensional diagram of another feasible implementation of the locking device in the present application, wherein the wheel is in a running state and the hook member is in a locked state; Fig.21 yes Fig. 20 A three-dimensional view of a portion of the structure of the cart shown, wherein the wheels are in a folded state and the hook member is in a locked state; Fig. 22 yes Fig. 20 A three-dimensional view of a portion of the structure of the cart shown, wherein the wheels are in a running state and the hook member is in a released state; Fig.23 yes Fig. 20 A three-dimensional view of a portion of the structure of the cart, wherein the hook member is in a released state and the adapter member is in a second state; Fig.24 yes Fig.23 A partial enlarged view of the stereogram shown; Fig.25 is a stereogram of other feasible implementations of the locking device in the present application; Fig.26yes Fig.25 A perspective view of a portion of the structure of the cart shown, wherein the wheels are in a folded state; Fig. 27 yes Fig.26 a cutaway view of the cart shown; Fig.28 yes Fig.25 A perspective view of a portion of the structure of the cart shown, wherein the wheels are in a driving position; Fig.29 yes Fig.26 Exploded view of cart shown. DETAILED DESCRIPTION

[0027] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0028] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0029] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0030] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0031] In this application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, etc. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0032] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0033] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0034] like Figure 1 The figure shows a cart 100, which is suitable for transporting and placing storage boxes 200. From the perspective of working conditions, when a user goes to work at a workplace, he generally needs to carry items 300 to be used, etc. In order to facilitate the user to carry and move the above items 300, the user generally uses a storage box 200 to store the above items 300. The user can place, hang or fix the storage box 200 or tools on the cart 100, so that the user can use the cart 100 to transport the storage box 200 to the workplace, or place tools at the workplace, or install a workbench on the cart 100, which serves as a temporary workbench to place machines or set up as a temporary office space, etc.

[0035] The article 300 here refers to one or a combination of accessories, tools, charging devices, power supply devices, lighting devices, accessory boxes / bags, tool boxes, auxiliary tools, etc.

[0036] In order to clearly describe the structure of the cart 100 and its working principle, the following are defined: Figure 1 It should be noted that, unless otherwise specified, the above, below, front, back, left, and right mentioned below all refer to the above. Figure 1 The state when it is at rest is shown.

[0037] like Figures 1 to 5 The cart 100 shown includes a base plate assembly 10 , a first support assembly 20 , a travel assembly 30 , and a pull rod assembly 40 .

[0038] The walking assembly 30 is connected to the base assembly 10. In the up and down direction, the walking assembly 30 is arranged on the base assembly 10. The walking assembly 30 includes one or more wheels 31. The walking assembly 30 can move the base assembly 10 relative to the ground. The user can push or pull the pull rod assembly 40 to rotate the wheel 31 relative to the ground, thereby driving the base assembly 10 to move. It should be noted that the above-mentioned ground can also refer to other contact surfaces for placing the cart 100, and is not limited to the earth.

[0039] The base assembly 10 is at least partially disposed on the walking assembly 30, and the base assembly 10 includes a base 11, and the wheels 31 are basically installed at the lower end of the base 11. The base 11 is used to stack the storage box 200, accessories, tools, charging devices, power devices, lighting devices, etc. Of course, the accessories, tools, charging devices, power devices, and lighting devices can also be placed in the storage box 200, and then the storage box 200 is placed on the base 11.

[0040] The rod assembly 40 is connected to the base plate assembly 10. The rod assembly 40 includes a rod 41. The rod 41 includes a first connecting rod 42 and a second connecting rod 43 that are relatively arranged and extend substantially in a straight line direction, and a gripping rod 44 that connects one end of the first connecting rod 42 and the second connecting rod 43. The user grips the gripping rod 44 to drive the cart 100 to move. The other ends of the first connecting rod 42 and the second connecting rod 43 are both pivotally connected to the base plate 11. The rod 41 is rotatably connected to the base plate 11. During the rotation of the rod 41, it has at least a storage state and a use state. An upper groove 12 is formed on the base plate 11. When the rod 41 is in the storage state, the rod 41 is stored in the upper groove 12, and the rod 41 is lower than the upper surface 13 of the base plate 11. When the rod 41 is in the use state, the rod 41 forms a certain angle with the base plate 11. The specific angle between the pull rod 41 and the bottom plate 11 is not limited here. The pull rod 41 and the bottom plate 11 can be infinitely rotatable or can be adjusted in gears. In this embodiment, the pull rod 41 and the bottom plate 11 are infinitely rotatable, that is, the user can rotate the pull rod 41 according to his or her needs. As other embodiments, the pull rod 41 can also be separated from the bottom plate 11, such as Fig.19 As shown, the pull rod 41 can be removed from the base plate 11 .

[0041] The first support assembly 20 is arranged on the upper side of the base assembly 10, and the first support assembly 20 includes a first support plate 21, and the first support plate 21 is arranged at the upper end of the base plate 11. The first support plate 21 has at least a first state, a second state and a third state relative to the base plate 11. When the first support plate 21 is in the first state, the first support plate 21 is connected to the base plate 11 through at least one storage box 200. When the first support plate 21 is in the second state, the first support plate 21 is directly mounted on the base plate 11. When the first support plate 21 is in the third state, the first support plate 21 is separated from the base plate 11. In this way, the user can choose different states according to the actual working conditions, which greatly increases the diversity of the functions of the cart 100. Of course, the user can also set the second support assembly, the third support assembly, etc. on the first support plate 21 through the storage box 200. In addition, when the first support plate 21 is in any state, it can be used in conjunction with the three states of the pull rod 41 relative to the base plate 11. In this way, the user can choose the state to be used according to the current working conditions, which is convenient for operation. Of course, if some structures do not have Please refer to Figure 7The cart 100 further includes a first connection assembly 45, which is used to connect the pull rod assembly 40 and the first support assembly 20, and to fix the pull rod 41 and the first support plate 21. The user can install the first support plate 21 above the bottom plate 11 through the first connection assembly 45 and the storage box 200. In order to ensure the stability of the connection between the pull rod 41 and the first support plate 21, the first connection assembly 45 can be installed on both the first connection rod 42 and the second connection rod 43. Here, the first connection assembly 45 installed on the first connection rod 42 is described.

[0042] When the user needs to switch the cart 100 to the first state, as a feasible implementation, the user can install the first support plate 21 on the bottom plate 11 through the first connecting assembly 45 and the storage box 200. The first connecting assembly 45 includes a first connecting member 451 and a second connecting member 452. When the first connecting member 451 and the second connecting member 452 are connected, the first support plate 21 and the first connecting rod 42 are fixedly connected. When the first support plate 21 and the first connecting rod 42 are separated, the first support plate 21 and the first connecting rod 42 are separated, and the pull rod 41 can rotate relative to the bottom plate 11. The first connecting member 451 is connected or formed on the first connecting rod 42, and the second connecting member 452 is connected or formed on the first support plate 21. The first connecting member 451 and the second connecting member 452 can be connected in a variety of ways, that is, the first connecting member 451 and the second connecting member 452 can be connected by one or a combination of threads, mortise and tenon joints, screws, latches and snap connections. The specific connection method between the first connecting member 451 and the second connecting member 452 is not limited here, as long as the first connecting member 451 and the second connecting member 452 can be connected and kept relatively fixed.

[0043] In this embodiment, the first connection assembly 45 further includes a fastener 453, and the first connection member 451 and the second connection member 452 are connected by the fastener 453. As a specific implementation, the first connection member 451 is formed on the first connection rod 42, and the second connection member 452 is formed on the first support plate 21. The first connection member 451 is formed with a first connection hole 454 penetrating the first connection member 451, and the second connection member 452 is formed with a second connection hole 455 penetrating the second connection member 452. When the user needs to fix the pull rod 41 and the first support plate 21, the first connection hole 454 and the second connection hole 455 are aligned first, and then the fastener 453 is passed through the first connection hole 454 and the second connection hole 455, so as to fix the first connection member 451 and the second connection member 452. When the user needs to separate the pull rod 41 from the first support plate 21, the user only needs to pull out the fastener 453 from the first connection hole 454 and the second connection hole 455, and the first connection member 451 and the second connection member 452 can move freely relative to each other. At this time, the user can separate the pull rod 41 from the first support plate 21 to switch the state. In this embodiment, the first support plate 21 and the pull rod 41 can be fixed or separated only by inserting or pulling out the fastener 453, which has a simple structure and is convenient for users to use. After the fastener 453 fixes the first connection member 451 and the second connection member 452, the holding rod 44 of the pull rod 41 is located above the first support plate 21 in the up and down direction. This arrangement makes it convenient for users to hold the holding rod 44 to push / pull the cart 100.

[0044] Please continue to refer to Figure 7The cart 100 further includes a bracket 46, which is detachably connected to the top of the pull rod 41. The bracket 46 can be used to put a cable on the bracket 46, and of course other items 300 can also be hung on the bracket 46. The bracket 46 is specifically a long strip of rod, wherein one end of the bracket 46 is connected to the first pull rod 41, and the other end is connected to the second pull rod 41. The bracket 46 and the first connecting rod 42 and / or the second connecting rod 43 are connected by one or more of the following: snap-on, thread, screw, mortise and tenon, and latch. In the present embodiment, the bracket 46 and the first connecting rod 42 and the second connecting rod 43 are connected by latches. The first connecting rod 42 is connected with a first plug-in portion 461, and the second connecting rod 43 is connected with a second plug-in portion 462. The first plug-in portion 461 and the second plug-in portion 462 correspond to each other, and the first plug-in portion 461 and the second plug-in portion 462 are both provided with a through hole. The bracket 46 can pass through the through holes on the first plug-in portion 461 and the second plug-in portion 462 to directly connect the bracket 46 to the pull rod 41. When the user needs to use the bracket 46, as an embodiment, the user can first pass one end of the bracket 46 through a through hole, put the cable on the bracket 46, and then pass one end of the bracket 46 through another through hole, so that the cable can be connected to the bracket 46. Of course, the cable here can also be other items 300. As another embodiment, the two ends of the bracket 46 directly pass through the through holes on the first connecting rod 42 and the second connecting rod 43, and the user can use a hook to hang the items 300 on the bracket 46. When the user needs to use these items 300, they can directly remove them from the bracket 46. As another embodiment, the user can also remove the bracket 46 from the pull rod 41. When some items 300 need to be hung or put on the bracket 46, the bracket 46 can be installed on the pull rod 41. This arrangement can not only add more space for placing items 300 on the cart 100, but also facilitate users to take or store items 300. In addition, the above structure is simple and easy to operate.

[0045] refer to Figure 3 As shown, the walking assembly 30 includes four wheels 31, which are mounted at the lower end of the base plate 11, and the wheels 31 can be driven to rotate relative to the base plate 11. The wheels 31 have a folded state and an extended state during rotation. When the wheels 31 are in the folded state, the wheels 31 are in the lower groove 14 of the base plate 11, and the wheels 31 are separated from the ground. When the wheels 31 are in the extended state, the wheels 31 are in contact with the ground. With this arrangement, when the user wants to use the cart 100, as long as the wheels 31 are switched to the extended state, the user can push the wheels 31 and drive the cart 100 to travel. When the user wants to store the cart 100, as long as the wheels 31 are switched to the folded state, the cart 100 can be stored in a storage area or placed in a pickup truck for transportation.

[0046] refer to Figures 5 to 14 As shown, the cart 100 further includes a second connecting assembly 50, which is used to connect the storage box 200 and the bottom plate 11. Of course, the first support plate 21 and the storage box 200 can also be connected through the second connecting assembly 50. In order to ensure the stability of the connection, the second connecting assemblies 50 can also be symmetrically installed at both ends of the bottom plate 11, the first support plate 21 and the storage box 200. Here, one of the second connecting assemblies 50 is taken as an example for detailed description. The second connecting assemblies 50 arranged relatively can be called a group of connecting devices.

[0047] The second connection assembly 50 includes a base 51, a driving member 52 and an adapter 53. The driving member 52 is mounted on the base 51, and the driving member 52 can move relative to the base 51, and the driving member 52 can be separated from or connected to the adapter 53. The base 51 can be connected or formed on the cart 100. It can also be understood that the base 51 can be connected or formed on the bottom plate 11. As a feasible embodiment, the base 51 is directly formed on the bottom plate 11, and multiple bases 51 can be set on the bottom plate 11, that is, multiple sets of connection devices can be installed on the bottom plate 11. In this way, the user can connect multiple storage boxes 200 on the bottom plate 11.

[0048] The driving member 52 can move relative to the base 51, that is, the driving member 52 has at least two states relative to the base 51, namely, a hidden state and a connected state. When the driving member 52 is in the connected state, the driving member 52 is in a mating position capable of mating with the adapter 53, and at this time the driving member 52 can be connected to the adapter 53. When the driving member 52 is in the hidden state, the driving member 52 is in a hidden position that is separated from the mating position. In this embodiment, the driving member 52 is connected to the bottom plate 11, and the adapter 53 is connected to or formed on the storage box 200 and / or the first support plate 21. As an embodiment, the adapter 53 is formed on the storage box 200, and when the driving member 52 is in the connected state, the driving member 52 can be locked with the adapter 53, thereby fixing the storage box 200 to the base 51. When the driving member 52 is in the hidden state, the driving member 52 is separated from the adapter 53, and the top surface of the driving member 52 in the up-down direction is lower than the upper surface 13 of the base 51 or the top surface of the driving member 52 is flush with the upper surface 13 of the base 51. Through the above arrangement, when the user wants to install the storage box 200 on the bottom plate 11, the driving member 52 can be switched to the connected state. When the user does not need to use the second connecting component 50, the driving member 52 can be switched to the hidden state. In this way, the user can stack other items 300 on the bottom plate 11 without damaging the second connecting component 50. Similarly, the second connecting component 50 will not interfere with the items 300, which increases the diversity of the functions of the cart 100 and facilitates the use of the user. It should be noted that the adapter 53 is not necessarily formed on the storage box 200, but can also be formed on other items 300, as long as the adapter 53 is connected to the driving member 52.

[0049] Specifically, a receiving cavity 511 is formed on the base 51, and the driving member 52 can be disposed in the receiving cavity 511. The driving member 52 can be received in the receiving cavity 511. The driving member 52 is pivotally connected to the base 51, and the driving member 52 can rotate relative to the base 51. When the user needs to switch the driving member 52 to the connection state, the driving member 52 can be rotated upward to the matching position. When the user does not need to use the second connection assembly 50, the driving member 52 can be rotated downward to the hidden position, that is, the driving member 52 is flipped over to the receiving cavity 511.

[0050] The first support plate 21 can be installed on the bottom plate 11. It can be understood that the first support plate 21 and the bottom plate 11 can be spaced apart, and of course the first support plate 21 and the bottom plate 11 can also be directly connected. The first support plate 21 is spaced apart from the bottom plate 11, that is, the first support plate 21 is connected to the bottom plate 11 through the first connecting component 45 and the storage box 200. In the up and down direction, two groups of connecting devices are arranged on the storage box 200. The storage box 200 has an upper top surface and a lower bottom surface that are arranged relatively. A group of connecting devices can be installed on the upper top surface of the storage box 200, and a group of connecting devices can also be installed on the lower bottom surface. Among them, an adapter 53 can be installed on the lower bottom surface of the storage box 200, and a driving member 52 is installed on the bottom plate 11. The user connects the adapter 53 with the driving member 52 to connect the storage box 200 to the bottom plate 11. A driving member 52 can be installed on the upper top surface of the storage box 200, and an adapter 53 can be installed on the lower end of the first support plate 21. The adapter 53 on the first support plate 21 can be connected to the driving member 52 on the storage box 200, so that the first support plate 21 is installed to the upper end of the storage box 200. At this time, the first support plate 21 is in the first state. In this embodiment, the pull rod 41 and the storage box 200 are used to replace the role of the support legs between the first support plate 21 and the bottom plate 11. In this way, the user can directly use the first support plate 21, a storage box 200 and the pull rod 41 to transform the single-layer cart 100 into a double-layer cart 100 during actual use, that is, the upper sides of the bottom plate 11 and the first support plate 21 form a storage space, and the user can directly place the items 300 on the bottom plate 11 and the first support plate 21 without installing additional support legs, etc., which simplifies the structure and facilitates user operation.

[0051] The first support plate 21 can be directly mounted on the bottom plate 11 through the second connection assembly 50. That is, the adapter 53 on the first support plate 21 can be directly connected to the driving member 52 on the bottom plate 11, so that the first support plate 21 can be directly connected to the bottom plate 11, and the first support plate 21 is in the second state, that is, the cart 100 becomes a single-layer cart 100, and the user can directly place the items 300 on the first support plate 21. In another embodiment of the cart 100, the first support plate 21 is not installed on the bottom plate 11, which can also be said that the first support plate 21 is in the third state. That is, a pull rod 41-type cart 100 is formed with a bottom plate 11. Users can also place items 300 on the bottom plate 11. Users push / pull the cart 100 through the pull rod 41. As another embodiment without installing the first support plate 21, the pull rod 41 can also be stored in the upper groove 12. In this way, the cart 100 becomes a flatbed cart 100. Users can directly place items 300 on the bottom plate 11, such as stacking multiple storage boxes 200. Users can directly push the storage boxes 200 to drive the wheels 31 to move. In summary, users can quickly and conveniently switch the cart 100 to a structure suitable for the current working conditions according to the current working conditions, so as to facilitate use.

[0052] The cart 100 may also be connected with an external hanging component 60, which is used to connect the item 300 to the cart 100 and / or the storage box 200. The external hanging component 60 includes at least one external hanging component 61, and the external hanging component 61 includes a mounting portion 611 and a connecting portion 612, wherein the mounting portion 611 is configured to be detachably connected to the item 300, and the connecting portion 612 is configured to be installed on the cart 100 and / or the storage box 200. In this way, the user can install the item 300 on the storage box 200 or the cart 100, and because it is installed in the external space, it is more convenient for the user to place or take it. The item 300 can be connected to the external hanging component 61 by a combination of one or more methods such as plugging, hanging, snapping, and adsorption.

[0053] The external component 60 also includes a middle piece 62 that can cooperate with the external component 61. The external component 61 is installed on the cart 100 and / or the storage box 200 through the middle piece 62, wherein one or more of the middle piece 62 and the external component 61 can be provided. The storage box 200, the bottom plate 11 and the first support plate 21 are all formed with a connecting section 63, which is specifically formed at the corners of the storage box, the bottom plate 11 and the first support plate 21. The connecting section 63 is embedded with a guard bar, which is made of a metal material. One or more middle pieces 62 can be installed on the connecting section 63, and the middle piece 62 can be connected to the connecting section 63 by one or more combinations of screws, pins, rivets and movable buckles. In this embodiment, the middle piece 62 is installed on the connecting section 63 by screw connection, that is, the middle piece 62 is fixed to the connecting section 63 by screws. Of course, it can be understood that a connection surface 631 is formed on the connection section 63, and a plurality of positioning holes 632 are provided on the connection surface 631. A mounting hole 621 is formed on the middle piece 62. The user can align the mounting hole 621 on the middle piece 62 with the corresponding positioning hole 632 as required, and then fix it with screws, so that the middle piece 62 is fixed to the connection section 63. When the middle piece 62 is detachable, one or more external parts 61 are installed, that is, the middle piece 62 can be installed with multiple external parts 61 at the same time, and the external parts 61 can be connected to the middle piece 62 by one or more combinations of screws, pins, rivets and movable buckles. In this embodiment, the external parts 61 are installed on the middle piece 62 by screw connection. There are multiple external parts 61, and the external parts 61 include one or a combination of battery pack hangers, cable hangers, ruler hangers, support parts 64 and electric tool hangers. In this way, the user can install the required items 300 on the storage box 200 or the cart 100 according to the actual working conditions. As a feasible implementation, the user can install the middle piece 62 on two adjacent connecting sections 63, and then connect one end of the supporting piece 64 to one middle piece 62 and the other end to another middle piece 62. A plurality of spaced slots are provided on the supporting piece 64, and the user can use a hook to clip the tool into the slot.

[0054] The first support plate 21 includes a first surface 211 and a second surface 212 and a third surface 213 located in the side wall direction of the first support plate 21. The first surface 211 is recessed downward to form a first groove 214, in which the user can place the storage box 200 or directly place the object 300. The first surface 211 is also recessed downward to form a plurality of small grooves 215, in which the user can place some small objects 300, such as saw blades, drill bits, screws, etc. There are also a plurality of recessed slots 216 on the first surface 211 for placing tools such as screwdrivers. The second surface 212 and the third surface 213 are arranged opposite to each other, and the second surface 212 and the third surface 213 are both provided with an adapter 53 for cooperating with the driving member 52, and the second surface 212 and the third surface 213 are also provided with a positioning portion, so that the user can directly install, hang or adsorb accessories, tools, charging devices, power supply devices, lighting devices, etc. on the second surface 212 and the third surface 213. The external component 61 may also be installed on the second surface 212 and / or the third surface 213 by one or more methods such as magnetic components, screw connections, snap connections, hook connections, etc.

[0055] like Figure 6 As shown, as a feasible embodiment, the external component 60 also includes one or more external components 71, and one or more fixing components 713 for installing the external component 71 on the cart 100, and the fixing component 713 can pass through the external component 71 and be connected to the first support plate 21. The external component 71 includes a connecting portion 712 and a mounting portion 711, the mounting portion 711 is used to be detachably connected to the object 300, and the connecting portion 712 is used to connect with the fixing component 713, so as to fix the external component 71 to the first support plate 21. The second surface 212 and / or the third surface 213 are both provided with a plurality of positioning grooves, and the connecting portion 712 is provided with a hole 714. When the fixing component 713 passes through the hole 714, the external component 71 is driven to be fixed to the positioning groove to be fixed. In this embodiment, the fixing component 713 and the positioning groove can be threadedly connected, that is, the fixing component 713 can be a screw. The external component 71 and the external component 61 can be installed on the cart 100 at the same time. like Figures 15 to 18 The second specific implementation of the first support plate 22 is shown. It should be noted that the second implementation is basically consistent with the cart 100 structure, storage box 200 structure, and external component 60 structure in the first implementation. The second implementation is different from the first implementation only in the specific structure of the first support plate 22, the connection method with the cart 100, and the installation position of the external component 60. Only the parts of the second implementation that are different from the first implementation are introduced here. For other structures, please refer to the previous text and will not be repeated here. The first support plate 22 in the first implementation and the first support plate 22 in the second implementation can be switched by the user as needed during actual use.

[0056] The first support plate 22 may be indirectly connected to the bottom plate 11 through at least two storage boxes 200 , or may be directly connected to the bottom plate 11 through a second connection assembly 50 .

[0057] The first support plate 22 specifically includes a first working plate 221, a second working plate 222, and a connecting plate 223 that has connected the first working plate 221 and the second working plate 222. An adapter 53 that matches the driving member 52 is installed on both the first working plate 221 and the second working plate 222.

[0058] Two storage boxes 200 are installed on the bottom plate 11. In the up-down direction, two groups of connecting devices are arranged on each storage box 200. The storage box 200 has an upper top surface and a lower bottom surface arranged opposite to each other. One group of connecting devices can be installed on the upper top surface of the storage box 200, and one group of connecting devices can also be installed on the lower bottom surface. Among them, an adapter 53 can be installed on the lower bottom surface of the storage box 200, and a driving member 52 is installed on the bottom plate 11. The user connects the adapter 53 with the driving member 52 to connect the storage box 200 to the bottom plate 11. The driving member 52 can be installed on the upper top surface of the storage box 200, and the adapter 53 on the first working plate 221 is connected to the driving member 52. Similarly, the adapter 53 on the second working plate 222 is connected to the driving member 52 on another storage box 200, so that the first support plate 22 is installed to the upper end of the storage box 200. At this time, the first support plate 22 is in the first state. In the first state, the cart 100 can be implemented in two ways. In one way, the user flips the pull rod 41 out of the lower groove 14, and the cart 100 can be moved by pushing / pulling the pull rod 41. In another way, the user stores the pull rod 41 in the lower groove 14, and then pushes the bottom plate 11, the storage box 200 or the first support plate 22 to move. In the first state, the user can use the first support plate 22 as a workbench, the user can place tools on the first support plate 22, and then cut workpieces on the first support plate 22, and can also write and draw drawings on the first support plate 22.

[0059] The first support plate 22 can also be directly mounted on the bottom plate 11, that is, the driving member 52 on the bottom plate 11 is connected to the adapter member 53 on the first support plate 22, so that the first support plate 22 is fixed on the bottom plate 11, and the first support plate 22 is in the second state. Of course, the first support plate 22 can also be removed from the bottom plate 11, and only the bottom plate 11 is retained, and the first support plate 22 is in the third state.

[0060] The first working plate 221 and the second working plate 222 are provided with connecting sections 63 at the four corners, and the user can install the middle piece 62 on the connecting section 63, and then install the external piece 61 in the middle. The first working plate 221 and the second working plate 222 are provided with accessory slots around them, and the user can place accessories in the accessory slots.

[0061] like Figure 4 As shown, in the present application, the storage box 200 can adopt a side wall opening 202, so that when the user installs the first support plate 22 on the storage box 200 and uses the storage box 200 as a support leg between the bottom plate 11 and the first support plate 22, when the user needs to take or store the items 300 in the storage box 200, it can be directly opened from the side wall of the storage box 200, thereby avoiding the situation that the user needs to remove the first support plate 22 from the storage box 200 before opening the storage box 200. At least one cover plate 203 is set on the side wall of the storage box 200, which is used to open or close the opening 202. The cover plate 203 and the box body of the storage box 200 can be connected by sliding or rotating. The sliding connection here can be sliding forward and backward or sliding left and right. The cover plate 203 can be a drawer 204, that is, the storage box 200 can be a drawer box, and the user can pull out the drawer 204 to open the opening 202 of the storage box 200. Alternatively, the cover plate 203 is a sliding door 205 that can be slid left and right by the user. The user moves the sliding door 205 to the left or right to open the opening 202 of the storage box 200. Similarly, to close the storage box 200, the user only needs to move the sliding door 205 to the left or right. Alternatively, the cover plate 203 can be a flip plate 206. The flip plate 206 and the body of the storage box 200 can be flipped up and down or left and right. In this way, when the user wants to open the storage box 200, he only needs to turn the flip plate 206 to expose the opening 202. The side wall here refers to the left side wall, right side wall, front side wall and rear side wall forming the four sides of the storage box 200. In addition, the storage box 200 can also be provided with multiple cover plates 203, so that the interior of the storage box 200 is divided into multiple storage spaces, which is convenient for the user to store and manage.

[0062] like Figure 3As shown, as a feasible embodiment, the walking assembly 30 also includes an intermediate rod, which is used to connect the two wheels 31. That is, the cart 100 includes at least two intermediate rods, namely the first intermediate rod 32 and the second intermediate rod 33, and one intermediate rod is connected to the two wheels 31. The intermediate rod can rotate relative to the bottom plate 11, and the intermediate rod can drive the wheels 31 to rotate together during the rotation. The bottom plate 11 is recessed from bottom to top to form a lower groove 14, and the intermediate rod is at least partially accommodated in the lower groove 14. At the same time, when the wheel 31 rotates with the intermediate rod, it can rotate into the lower groove 14 with the connecting rod, that is, the wheel 31 can be completely stored in the lower groove 14. In this way, when the cart 100 is not in use, the user can store the wheel 31 in the lower groove 14, which is convenient for storage and transportation. When the user needs to use the walking function of the cart 100, the wheel 31 is flipped out of the lower groove 14 and can be used. In this embodiment, the wheel 31 is a universal wheel, so that when the user pushes or pulls the cart 100, the user can adjust the direction of the cart 100, which is convenient for the user to use. The wheel 31 can be provided with a foot brake.

[0063] The cart 100 also includes a locking device 34, which can cooperate with the travel assembly 30. Specifically, the locking device 34 is used to lock the connecting rod so that the travel wheel 31 can be maintained in the current state to prevent the cart 100 from switching states due to vibration during transportation or use. The locking device 34 includes a first operating rod 341, a second operating rod 342, an elastic member 343, a first adapter 321 and a second adapter 322 that can cooperate with the first operating rod 341, a third adapter 331 and a fourth adapter 332 that can cooperate with the second operating rod 342, and a shell 344. The shell 344 is mounted to the lower end of the bottom plate 11, or it can be said that the shell 344 is arranged in the lower groove 14, the first operating rod 341 and the second operating rod 342 are at least partially arranged in the shell 344, the elastic member 343 is arranged in the shell 344, and one end of the elastic member 343 is connected to the first operating rod 341, and the other end of the elastic member 343 is connected to the second operating member. The first adapter portion 321 and the second adapter portion 322 are arranged on the first intermediate rod 32, and the third adapter portion 331 and the fourth adapter portion 332 are arranged on the second intermediate rod 33. The first operating rod 341 is formed with a first operating portion 347 operable by a user and a first clamping portion 345 capable of cooperating with the first adapter portion 321 or the second adapter portion 322, and the second operating rod 342 is formed with a second operating portion 348 operable by a user and a second clamping portion 346 capable of cooperating with the third adapter portion 331 or the fourth adapter portion 332. When the wheel 31 is in a folded state, the first clamping portion 345 is clamped with the first adapter portion 321, and the second clamping portion 346 is clamped with the third adapter portion 331. When the user wants to switch the wheel 31 from the folded state to the extended state, it is necessary to toggle the first operating portion 347 and the second operating portion 348 to move the first operating portion 347 and the second operating portion 348 toward each other, thereby releasing the first clamping portion 345 from the first adapter portion 321 and releasing the second clamping portion 346 from the third adapter portion 331. During this process, the first operating rod 341 and the second operating rod 342 press the elastic member 343, and then rotate the wheel 31 until the first clamping portion 345 and the second clamping portion 346 are clamped into the second adapter portion 322 and the fourth adapter portion 332 due to the action of the elastic member 343, thereby keeping the wheel 31 in the extended state. When the user needs to switch the wheel 31 from the extended state to the folded state, the user only needs to push the first operating portion 347 and the second operating portion 348 towards each other, and then flip the wheel 31 inward until the first clamping portion 345 is clamped with the first adapter portion 321, and the second clamping portion 346 is clamped with the third adapter portion 331.

[0064] The first adapter portion 321 or the second adapter portion 322 is specifically two holes formed on the first intermediate rod 32, and the third adapter portion 331 or the fourth adapter portion 332 is also two holes formed on the second intermediate rod 33. The first operating rod 341 and the second operating rod 342 are long columns that can be inserted into the corresponding holes.

[0065] As another specific implementation of the locking device, Figure 20 to Figure 25 As shown, the structure of the bottom plate, wheels and middle rod is basically the same as that of the previous embodiment, and only the different parts are described below. like Figure 20 to Figure 24 As shown, the locking device 430 is used to control the wheel 411 to switch between the driving state and the folding state. The locking device 430 is at least partially arranged at the lower end of the base plate 421. The locking device 430 includes a limit assembly 431 and a locking assembly 441. The limit assembly 431 is used to cooperate with the middle rod 412 to limit the rotation of the middle rod 412. The locking assembly 441 cooperates with the limit assembly 431 to fix the middle rod 412 to the current state. In some usage conditions, the user needs to use the cart 100 to transport tools from the storage site to the workplace. In order to reduce the number of transportations, the user will try to pile all the tools required for the work on the cart 100. This will result in the cart 100 having to bear a large weight. In addition, the user's workplace is bound to have some complex road conditions. The cart 100 is heavy and the road conditions are rugged. At this time, when the user pushes the cart 100, high-intensity vibrations will be generated. In this way, the wheel 411 will often be unable to withstand such high-intensity vibrations, and the wheel 411 will be out of the driving state, making the cart 100 unusable. The structural setting of the limit assembly 431 and the locking assembly 441 can keep the wheel 411 in the driving state at all times.

[0066] The limiting assembly 431 includes an adapter 432 and a base 33, the base 33 is connected or integrally formed with the bottom plate 421, the adapter 432 is connected to the base 33, and the adapter 432 can rotate relative to the base 33. In this embodiment, the base 33 is connected to the bottom plate 421, one end of the adapter 432 is connected to the base 33, the other end of the adapter 432 can be driven to move freely, and the other end of the adapter 432 can be connected to the base 33 during the movement. The intermediate rod 412 is at least partially in contact with the base 33, and the intermediate rod 412 can rotate relative to the base 33. The adapter 432 can be driven to switch between a first state and a second state. When the adapter 432 is in the first state, the adapter 432 is connected to the base 33, and the intermediate rod 412 can only remain in the current position and cannot rotate, that is, when the adapter 432 is in the first position, the adapter 432 and the base 33 limit the rotation of the intermediate rod 412. When the adapter 432 is in the second state, only one end of the adapter 432 is connected to the base 33, and the intermediate rod 412 can be driven to rotate relative to the base 33. The locking assembly 441 can cooperate with the limiting assembly 431 to connect the other end of the adapter 432 to the base 33.

[0067] As a feasible implementation, the limiting assembly 431 includes a cam member 442 and a hook member 443. The cam member 442 is rotatably connected to the base 33, and the hook member 443 is connected to the cam member 442. The hook member 443 and the cam member 442 cooperate to connect one end of the adapter 432 to the base 33. A clamping portion 444 for the hook member 443 is provided on one end of the adapter 432. The hook member 443 has a locking state and a release state relative to the adapter 432. When the hook member 443 is in the locking state, the hook member 443 is connected to the adapter 432. At this time, the hook member 443 applies a force to the adapter 432 and the base 33, so that the adapter 432 and the base 33 remain relatively fixed. At the same time, the adapter 432 and the base 33 lock the intermediate rod 412, wherein the intermediate rod 412 cannot rotate due to the abutment between the adapter 432 and the base 33. When the hook member 443 is in the released state, the hook member 443 is separated from the adapter 432 , and the adapter 432 is configured to be allowed to be separated from the base 33 .

[0068] When the user wants to switch the hook member 443 from the locked state to the released state, the cam member 442 is driven to rotate upward. During the upward rotation of the cam member 442, the hook member 443 is driven to move upward. At this time, the force applied to the adapter 432 and the base 33 disappears, and then the hook member 443 is driven to rotate to separate the hook member 443 from the clamping portion 444. At this time, the hook member 443 is switched from the locked state to the released state. After the hook member 443 is separated from the adapter 432, the adapter 432 can be driven to rotate relative to the base 33. At this time, the user can drive the intermediate rod 412 to rotate relative to the base 33. When the user wants to switch the hook member 443 from the release state to the lock state, the hook member 443 is driven to move upward until it contacts the engaging portion 444. The hook member 443 is partially sleeved on the adapter 432. Since the hook member 443 is connected to the cam member 442, when the hook member 443 moves upward, the cam member 442 also rotates upward until the hook member 443 contacts the engaging portion 444. At this time, the cam member 442 is driven to rotate downward, thereby driving the hook member 443 to move downward until the adapter 432, the base 33 and the middle rod 412 are in contact. At this time, the hook member 443 is in the lock state. When the hook member 443 is in the lock state, the wheel 411 can be in the driving state or the folding state.

[0069] As a feasible implementation, the limit assembly 431 also includes a positioning pin, which is connected to the middle rod 412. The positioning pin abuts against the adapter 432 after the adapter 432 rotates a preset angle. When the positioning pin abuts against the adapter 432, the middle rod 412 can only remain in the current state, thereby keeping the wheel 411 in the current state, even if the wheel 411 remains in the driving state or the folded state.

[0070] Specifically, the limiting assembly 431 includes two positioning pins, which are defined as a first positioning pin 434 and a second positioning pin 435. The first positioning pin 434 and the second positioning pin 435 are arranged in the circumferential direction of the intermediate rod 412. The first positioning pin 434 and the second positioning pin 435 both penetrate the intermediate rod 412, and one end of the first positioning pin 434 and one end of the second positioning pin 435 both protrude from the intermediate rod 412. When the wheel 411 is in the driving state, the first positioning pin 434 abuts against the adapter 432, and when the wheel 411 is in the folded state, the second positioning pin 435 abuts against the adapter 432. By arranging the positioning pins on the intermediate rod 412, the wheel 411 is prevented from rotating when in the driving state, so that the wheel 411 always remains in the current state.

[0071] The adapter 432 is formed with an adapter portion 438 that cooperates with the positioning pin. When the positioning pin contacts the adapter portion 438, the wheel 411 remains in the current state. When the adapter portion 438 cooperates with the first positioning pin 434, the wheel 411 is in a driving state. When the adapter portion 438 cooperates with the second positioning pin 435, the wheel 411 is in a folded state. The base 33 is formed with a first stopper 436 and a second stopper 437 that cooperate with the positioning pin. The first stopper 436 and the second stopper 437 are respectively arranged at both ends of the base 33. It can be understood that the first stopper 436 and the second stopper 437 are arranged on both sides of the middle rod 412. When the wheel 411 is in the driving state, the first positioning pin 434 contacts the adapter 438, and the second positioning pin 435 contacts the first stopper 436. When the wheel 411 is in the folded state, the first positioning pin 434 contacts the second stopper 437, and the second positioning pin 435 contacts the adapter 438. In this way, when the wheel 411 is in the driving state, the positioning pin cooperates with the base 33 and the adapter 432 to prevent the intermediate rod 412 from rotating.

[0072] The first adapter 432 also includes a guide portion 439, which is used to guide the positioning pin to slide into the adapter 438. The guide portion 439 is connected to the adapter 438 and is integrally formed. The adapter 438 is specifically a hole formed on the adapter 432, and the guide portion 439 is an inclined arc surface. In this way, when the intermediate rod 412 is rotated to the corresponding position, the positioning pin first contacts the guide portion 439, and then the adapter 432 is rotated to adjust the position of the positioning pin with the guide portion 439 until the positioning pin is inserted into the adapter 438 under the guidance of the guide portion 439.

[0073] As a method of use, when the user wants to switch the wheel 411 from the folded state to the driving state, the hook member 443 is in a locked state, the first positioning pin 434 contacts the second stop portion 437, the second positioning pin 435 contacts the adapter portion 438, and the adapter member 432 is in the first state. The user operates the cam member 442 to rotate upward so that the force applied by the hook member 443 to the adapter 432 and the base 33 is cancelled. The user rotates the hook member 443 to separate the hook member 443 from the clamping portion 444. At this time, the adapter 432 is still in the first state. The user rotates the adapter 432 to switch the adapter 432 from the first state to the second state. At this time, the adapter portion 438 is separated from the second positioning pin 435. The user rotates the intermediate rod 412 to separate the first positioning pin 434 from the second stop portion 437. The intermediate rod 412 is continued to be rotated until the first stop portion 436 contacts the first positioning pin 434. At this time, the adapter 432 is rotated to make the guide portion 439 on the adapter 432 contact the second positioning pin 435. The adapter 432 is continued to be rotated to make the second positioning pin 435 inserted into the adapter 438. At this time, the adapter 432 rotates to the second state. The user rotates the hook member 443 so that the hook member 443 is sleeved on the clamping portion 444, and then rotates the cam portion downward so that the cam portion drives the hook member 443 to move downward until the buckle is in a locked state. At this time, the hook member 443 applies a force between the adapter 432 and the base 33, thereby reducing the gap between the base 33, the adapter 432 and the contact portion of the middle rod 412. This ensures that the cart 100 can always be in a driving state when in use, and the vibration generated by the cart 100 will not cause the wheel 411 to switch from the driving state to the folding state, thereby ensuring the stability of the cart 100 structure.

[0074] Of course, in order to ensure the stability of the structure, another set of locking devices 430 is symmetrically arranged on the other middle rod 412, and their structures and principles are basically the same, which will not be repeated here.

[0075] As a specific embodiment of other locking devices, Figure 25 to Figure 29 As shown, the bottom plate 421, the wheels 411 and the middle rod 412 are basically the same as those of the previous embodiment, and the bottom plate 421, the wheels 411 and the middle rod 412 use the same reference numerals as those of the previous embodiment.

[0076] The locking device 450 is used to control the wheel 411 to switch between the driving state and the folding state. The locking device 450 is at least partially arranged at the lower end of the base plate 421. The locking device 450 includes a locking assembly 451. The locking assembly 451 is used to cooperate with the intermediate rod 412 to keep the intermediate rod 412 in the driving state.

[0077] The locking assembly 451 includes a resisting member 452, a handle 453 and a latch 454. The resisting member 452 can be driven to rotate, and during the rotation of the resisting member 452, the resisting member 452 can cooperate with the intermediate rod 412. The handle 453 can be driven by a user, and the handle 453 is connected to the resisting member 452, that is, when the handle 453 rotates, the resisting member 452 can rotate accordingly. The latch 454 is connected to the bottom plate 421, and the latch 454 is used to cooperate with the handle 453, so that the handle 453 remains in the current position. When the latch 454 is separated from the handle 453, the handle 453 can drive the resisting member 452 to rotate.

[0078] In addition, the locking assembly 451 also includes a base, a positioning member 455 and a connecting pin. The base is connected to the bottom plate 421, and the handle 453 and the abutment member 452 are connected to the base through the connecting pin, so that the handle 453, the connecting pin and the abutment member 452 are configured to rotate synchronously. The positioning member 455 can cooperate with the abutment member 452 to keep the middle rod 412 at the current position. The positioning member 455 is sleeved on the outer periphery of the middle, and the positioning member 455 rotates together with the middle rod 412. The above-mentioned adapter 457 is formed on the positioning member 455, and the cam portion 456 is formed on the driving member. During the rotation of the abutment member 452, the cam portion 456 will interfere with the adapter portion 457. When the cam portion 456 abuts against the adapter portion 457, the wheel 411 remains in the current state. When the cam portion 456 is separated from the adapter portion 457, the middle rod 412 can rotate without driving.

[0079] The cross section of the positioning member 455 is roughly rectangular. As an embodiment, the positioning member 455 and the intermediate member are two parts, which are assembled to rotate synchronously. As another embodiment, the positioning member 455 and the intermediate rod 412 are an integral part, that is, the cross section of the intermediate rod 412 is roughly rectangular. The cam portion 456 is roughly arc-shaped, so that when the cam portion 456 abuts against the adapter, the interference area between the abutment member and the positioning member 455 will be larger, thereby making the structure between the abutment member 452 and the positioning member 455 more stable.

[0080] The locking device 450 further includes a limit assembly 461, which is used to guide the positioning member 455 to rotate to a preset position, thereby facilitating the interference between the abutting member 452 and the positioning member 455. The limit assembly 461 is connected to the base, and the limit assembly 461 can be driven to rotate together with the abutting member 452. The limit assembly 461 includes a guide member 462, which is connected to the connecting pin, and the guide member 462 rotates together with the abutting member 452. When the wheel 411 is in the driving state, the guide member 462 is at least partially in contact with the positioning member 455. Furthermore. When the wheel 411 is in the driving state, the guide member 462 and the abutting member 452 at least partially overlap in the extending direction perpendicular to the intermediate rod 412. The guide member 462 is generally U-shaped. When the wheel 411 is in the driving state, the positioning member 455 is at least partially arranged in the middle of the guide member 462, and the abutting member 452 is located at the lower end of the positioning member 455. That is, when rotating, the guide member 462 first contacts the positioning member 455 with the abutting member 452. During the rotation of the guide member 462, the guide member 462 first contacts the positioning member 455 and guides the positioning member 455 to a preset position, so that the abutting member 452 and the positioning member 455 are interference-fitted.

[0081] As a method of use, when the user wants to switch the wheel 411 from the folded state to the driving state, the handle 453 is engaged with the buckle 454, the guide member 462 is at least partially in contact with the positioning member 455, and the support member 452 and the positioning member 455 are in interference. The user operates the handle 453 to separate the handle 453 from the locking member 454, and then continues to rotate the handle 453 upward, while driving the guide member 462 and the supporting member 452 to rotate downward together, the supporting member 452 is separated from the positioning member 455, and the guide member 462 is separated from the positioning member 455. At this time, the middle rod 412 is driven to rotate to the preset position, that is, the wheel 411 is folded out from the lower end of the bottom plate 421, and then the handle 453 is rotated in the opposite direction, that is, the handle 453 is rotated downward, while driving the guide member 462 and the supporting member 452 to rotate upward together, until the guide member 462 is in at least partial contact with the positioning member 455, and the handle 453 is continued to be rotated upward until the locking member 454 of the handle 453 is engaged, and at this time the supporting member 452 is in interference contact with the positioning member 455.

[0082] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A cart suitable for storing boxes, comprising: A walking assembly including rotatable wheels; A base plate assembly, comprising a base plate, wherein the base plate is connected to the walking assembly; It is characterized in that The cart further includes a first support plate having at least a first state relative to the base plate; When the first support plate is in the first state, the first support plate is connected to the bottom plate through at least one of the storage boxes.

2. The cart according to claim 1, characterized in that: The first support plate has a second state and a third state relative to the base plate. When the first support plate is in the second state, the first support plate is mounted on the base plate and the first support plate is at least partially in contact with the base plate. When the first support plate is in the third state, the first support plate is separated from the base plate.

3. The cart according to claim 2, characterized in that: The cart also includes a pull rod assembly connected to the base plate assembly, the pull rod assembly includes a pull rod connected to the base plate, the pull rod is configured to be able to move relative to the base plate, and the pull rod has at least two states relative to the base plate, namely a storage state and a use state. When the pull rod is in the storage state, the pull rod is at least partially inside the base plate, and the pull rod is lower than the upper surface of the base plate; when the pull rod is in the use state, the pull rod is configured to be able to connect to the first support plate.

4. The cart according to claim 3, characterized in that: The tie rod further has a separation state relative to the base plate, and when the tie rod is in the separation state, the tie rod is configured to allow separation from the base plate.

5. The cart according to claim 3, characterized in that: The three states of the first support plate relative to the bottom plate are configured to be used in conjunction with the two states of the pull rod relative to the bottom plate, respectively.

6. The cart according to claim 1, characterized in that: The cart further comprises a drawbar assembly connected to the base plate assembly, wherein the drawbar assembly comprises a drawbar connected to the base plate, and the first support plate is connected to the base plate through the storage box and the drawbar.

7. The cart according to claim 1, characterized in that: The cart also includes a pull rod assembly connected to the base plate assembly, the pull rod assembly includes a pull rod connected to the base plate, and the cart also includes a first connecting assembly connecting the pull rod to the first support plate, the first connecting assembly includes a first connecting member and a second connecting member, when the first connecting member and the second connecting member are connected, the first support plate is fixedly connected to the pull rod, when the first connecting member and the second connecting member are separated, the first support plate is separated from the pull rod, and the first support plate and the pull rod can both move relative to the base plate.

8. The cart according to claim 7, characterized in that: The first connecting component also includes a fastener capable of cooperating with the first connecting member and the second connecting member, the first connecting member is connected to the pull rod, the second connecting member is connected to the first support plate, a first connecting hole is formed on the first connecting member, and a second connecting hole is formed on the second connecting member, and the fastener passes through the first connecting hole and the second connecting hole, thereby connecting the first support plate to the pull rod.

9. The cart according to claim 1, characterized in that: The cart further comprises a drawbar assembly connected to the base plate assembly, wherein the drawbar assembly comprises a drawbar connected to the base plate and a bracket detachably connected to the drawbar.

10. The cart according to claim 1, characterized in that: The first support plate is connected to the bottom plate through at least two storage boxes.

11. The cart according to claim 1, characterized in that: The cart further includes a second connection assembly by which the storage box is mounted to the base plate.

12. The cart according to claim 11, characterized in that: The first supporting plate is mounted on the storage box through the second connecting assembly.

13. The cart according to claim 1, wherein: The cart further comprises a second connecting assembly, and the first supporting plate is connected to the bottom plate via the second connecting assembly.

14. The cart according to claim 1, wherein: The cart further comprises at least one external attachment, wherein the external attachment comprises a mounting portion and a connecting portion, wherein the mounting portion is configured to be detachably connected to an item, and the connecting portion is configured to be mounted on the cart and / or the storage box.

15. The cart according to claim 14, characterized in that: The cart further comprises an external hang-on assembly, wherein the external hang-on assembly comprises the external hang-on part and an intermediate part, and the external hang-on part is mounted to the connection section of the storage box and / or the first support plate through the intermediate part.

16. The cart according to claim 14, wherein: The cart further includes an external hanging component, and the external hanging component includes a fixing piece, and the fixing piece passes through the connecting portion to install the external hanging component on the first supporting plate.

17. The cart according to claim 14, wherein: The item can be adsorbed onto the external component.

18. The cart according to claim 14, wherein: The external component is mounted to the outer periphery of the first support plate.

19. The cart according to claim 1, wherein: The storage box is detachably connected to the bottom plate, the first support plate is detachably connected to the bottom plate through the storage box, and an upper side of the first support plate forms a space for storing articles.

20. The cart according to claim 1, wherein: The first support plate is detachably connected to the bottom plate via at least one storage box, and the storage box is formed with an opening that can be opened or closed.

Images