Cart suitable for storage box

Abstract

The utility model discloses a cart suitable for a storage box, and the cart comprises a walking assembly which comprises wheels and a middle rod connected with the wheels; the bottom plate assembly comprises a bottom plate, the walking assembly is at least partially connected to the bottom plate assembly, the wheels rotate relative to the bottom plate, in the rotating process of the wheels, the wheels at least have a running state and a folding state, when the wheels are in the running state, the wheels are configured to allow the bottom plate to move, and when the wheels are in the folding state, the wheels are stored to the lower side of the bottom plate; the stroller is characterized in that the stroller further comprises a locking device, and the locking device is configured to control the wheels to be switched between the running state and the folding state; the locking device comprises an adapter which is connected to the bottom plate, the adapter comprises an adapter part, and the adapter is configured to be connected with the middle rod after rotating by a preset angle; and the positioning pin is connected to the middle rod, the positioning pin abuts against the adaptive part after the adaptive part rotates by a preset angle, and when the positioning pin abuts against the adaptive part, the wheel is kept in the current state.

Description

Technical Field

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

[0002] A cart in the related technology is a frequently used tool in the field of power tools. It is often used to transport the tools required by the user to the work site. However, there is a certain distance between the work site and the tool storage site. Therefore, the user will place the cart, storage box, tools, etc. on a pickup truck, and then transport the above tools to the work site. In order to place more tools, the space occupied by the cart needs to be as small as possible. Similarly, when the cart is stored in the user's storage site, the space occupied by the cart also needs to be as small as possible. Therefore, it is very necessary to set the wheels to be foldable.

[0003] This section provides background information related to the present application which is not necessarily prior art. Utility Model Content

[0004] An object of the present application is to solve or at least alleviate part or all of the above problems. To this end, an object of the present application is to provide a locking device for a wheel of a cart.

[0005] In order to achieve the above-mentioned objectives, the present application adopts the following technical solutions: a cart suitable for storage boxes, comprising: a walking assembly, including wheels, and an intermediate rod connecting the wheels; a base assembly, including a base, the walking assembly is at least partially connected to the base assembly, the wheels rotate relative to the base, and during the rotation of the wheels, the wheels have at least a use state and a folded state. When the wheels are in the use state, the wheels are configured to allow the base to move, and when the wheels are in the folded state, the wheels are stored to the lower side of the base; it is characterized in that the cart also includes a locking device, which is configured to control the wheels to switch between the use state and the folded state; the locking device includes: an adapter, connected to the base, the adapter includes an adapter part, and the adapter is configured to be connected to the intermediate rod after rotating through a preset angle; a positioning pin, connected to the intermediate rod, the positioning pin abuts against the adapter after the adapter rotates through a preset angle, and when the positioning pin abuts against the adapter part, the wheel remains in the current state.

[0006] In some embodiments, the cart further includes a support plate for placing items, and the support plate is spaced apart from the bottom plate by support legs.

[0007] In some embodiments, the cart further includes a pull rod, a support plate for placing items, and a storage box for storing items, wherein the support plate is spaced apart from the bottom plate by the storage box and the pull rod.

[0008] In some embodiments, the locking device further includes a limiting assembly, which includes an adapter and a base rotatably connected to the adapter, and the base and the adapter cooperate to limit the rotation of the intermediate rod.

[0009] In some embodiments, the locking device further includes a locking assembly, which includes a cam member and a hook member, the cam member is rotatably connected to the base, the hook member is connected to the cam member, and the hook member and the cam member cooperate to connect the adapter and the base.

[0010] In some embodiments, the middle rod is provided with two positioning pins, which are positioned as a first positioning pin and a second positioning pin, and the base is provided with a first stop portion and a second stop portion that cooperate with the positioning pins. When the wheel is in use, the first positioning pin contacts the adapter portion, and the second positioning pin contacts the first stop portion. When the wheel is in a folded state, the first positioning pin contacts the second stop portion, and the second positioning pin contacts the adapter.

[0011] In some embodiments, the first positioning pin and the second positioning pin are arranged in a circumferential direction of the intermediate rod.

[0012] In some embodiments, the middle rod is rotated to a preset position, and the adapter is rotated to a preset angle so that the first positioning pin contacts the adapter portion, and after the second positioning pin contacts the first stop portion, the hook member contacts and abuts against the adapter, thereby switching the wheel to a use state.

[0013] In some embodiments, the adapter is a hole through which the positioning pin can partially pass.

[0014] In some embodiments, the adapter further includes a guide portion configured to guide the positioning pin to slide into the adapter portion.

[0015] The present application is beneficial in that it provides a locking device for use on a wheel of a cart. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of a cart that can be used for storage boxes in the present application;

[0017] Figure 2 yes Figure 1 A perspective view of the middle cart from another angle;

[0018] Figure 3 yes Figure 1 Stereoscopic images of the center cart from other angles;

[0019] Figure 4 yes Figure 1 A perspective view of the items removed from the center cart;

[0020] Figure 5 yes Figure 4 A perspective view of the middle cart from another angle;

[0021] Figure 6 yes Figure 4 A perspective view of the middle portion of the external attachment being separated from the cart, where the cart is in a first state;

[0022] Figure 7 yes Figure 6 A perspective view of the first support plate being separated from the pull rod and storage, and the cart is in the third state;

[0023] Figure 8 yes Figure 6 A perspective view of the first support plate directly connected to the base plate, in which the cart is in the second state with the wheels in the extended state;

[0024] Figure 9 yes Figure 6 A perspective view of the cart with the first support plate removed, showing the cart in a third state, with the pull rod in use and the drive member in a connected state;

[0025] Figure 10 yes Figure 9 A three-dimensional view of the cart with the middle pull rod in the stowed state and the drive unit in the hidden state;

[0026] Figure 11 yes Figure 1 A perspective view of the middle pushcart with the pull rod in the stowed state, the pushcart in the second state, and the wheels in the folded state;

[0027] Figure 12 yes Figure 11 A perspective view of the mid-sized cart from another angle, with the wheels folded.

[0028] Figure 13 yes Figure 11 An exploded view of the locking mechanism on the center cart;

[0029] Figure 14 yes Figure 1 A perspective view of the first support plate;

[0030] Figure 15 is a second embodiment in which the first support plate is connected to the base plate via a storage box;

[0031] Figure 16 yes Figure 15 A perspective view of the cart with items removed;

[0032] Figure 17 yes Figure 16 A three-dimensional diagram of the first support plate and the bottom plate being separated;

[0033] Figure 18 yes Figure 15 A perspective view of the second first support plate;

[0034] Figure 19 yes Figure 9 A three-dimensional diagram of the center tie rod in a separated rotation state;

[0035] Figure 20 is a perspective view of another feasible embodiment 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;

[0036] Figure 21 yes Figure 20 A perspective view of a portion of the stroller shown, wherein the wheels are folded and the hook is locked;

[0037] Figure 22 yes Figure 20 A perspective view of a portion of the structure of the cart shown, wherein the wheels are in a driving state and the hook member is in a released state;

[0038] Figure 23 yes Figure 20 A perspective view of a portion of the structure of the cart shown, wherein the hook member is in a released state and the adapter member is in a second state;

[0039] Figure 24 yes Figure 23 An enlarged view of a portion of the stereogram shown;

[0040] Figure 25 is a perspective view of another feasible embodiment of the locking device in the present application;

[0041] Figure 26 yes Figure 25 A perspective view of a portion of the stroller shown with the wheels in a folded position;

[0042] Figure 27 yes Figure 26 a cutaway view of the cart shown;

[0043] Figure 28 yes Figure 25 A perspective view of a portion of the cart shown, with the wheels in motion;

[0044] Figure 29 yes Figure 26 Exploded view of cart shown. DETAILED DESCRIPTION

[0045] Before any embodiments of the present 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 foregoing drawings.

[0046] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0047] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0048] In this 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, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0049] In this application, it will be understood by those skilled 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 the specific value, the tolerance caused by manufacturing, assembly, and use associated with the 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" when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular) may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) based on the indicated angle.

[0050] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0051] 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 the other element "upper" or "lower", but also be indirectly connected to the other 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, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0052] like Figure 1 A cart 100 is shown, suitable for transporting and placing storage boxes 200. Considering work conditions, users typically need to carry items 300 to be used when going to a workplace. To facilitate carrying and moving these items 300, users typically use storage boxes 200 to store these items 300. Users can place, hang, or secure storage boxes 200 or tools on the cart 100. This allows users to use the cart 100 to transport the storage boxes 200 to a workplace, place tools at a workstation, or install a workbench on the cart 100, serving as a temporary workbench to place machinery or set up a temporary office space.

[0053] 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.

[0054] 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 Shown is the state when at rest.

[0055] 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 .

[0056] The travel assembly 30 is connected to the base assembly 10 and is positioned vertically above the base assembly 10. The travel assembly 30 includes one or more wheels 31, enabling the base assembly 10 to move relative to the ground. A user can push or pull the pull rod assembly 40 to rotate the wheels 31 relative to the ground, thereby moving the base assembly 10. It should be noted that the term "ground" may refer to any other surface on which the cart 100 rests, and is not limited to the earth.

[0057] The base assembly 10 is at least partially mounted on the travel assembly 30. The base assembly 10 includes a base plate 11, with wheels 31 mounted substantially at the lower end of the base plate 11. The base plate 11 is used to store storage boxes 200, accessories, tools, charging devices, power supplies, lighting devices, and the like. Alternatively, the accessories, tools, charging devices, power supplies, and lighting devices can be placed inside the storage boxes 200, which are then placed on the base plate 11.

[0058] The pull rod assembly 40 is connected to the base plate assembly 10 and includes a pull rod 41. The pull rod 41 includes a first connecting rod 42 and a second connecting rod 43 that are oppositely arranged and extend in a substantially straight direction, and a gripping rod 44 that connects one end of the first connecting rod 42 and the second connecting rod 43. A user grips the gripping rod 44 to drive the cart 100. 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 pull rod 41 is rotatably connected to the base plate 11. During the rotation of the pull rod 41, the pull rod 41 has at least a storage state and a use state. The base plate 11 has an upper groove 12 formed therein. When the pull rod 41 is in the storage state, the pull rod 41 is stored in the upper groove 12 and is lower than the upper surface 13 of the base plate 11. When the pull rod 41 is in the use state, the pull 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 Figure 19 As shown, the pull rod 41 can be removed from the base plate 11.

[0059] The first support assembly 20 is disposed on the upper side of the base assembly 10. The first support assembly 20 includes a first support plate 21, which is disposed at the upper end of the base 11. The first support plate 21 has at least a first state, a second state, and a third state relative to the base 11. When the first support plate 21 is in the first state, the first support plate 21 is connected to the base 11 via 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 11. When the first support plate 21 is in the third state, the first support plate 21 is separated from the base 11. This arrangement allows the user to select different states according to actual working conditions, greatly increasing the functional versatility of the cart 100. Of course, the user can also use the storage box 200 to set the second support assembly, the third support assembly, etc. on the first support plate 21. 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 11. This arrangement allows the user to select the state to use according to the current working conditions, making operation more convenient. Of course, if some structures are not

[0060] Please refer to Figure 7 The cart 100 further includes a first connecting assembly 45, which is used to connect the pull rod assembly 40 and the first support assembly 20, and to securely connect the pull rod 41 and the first support plate 21. The user can install the first support plate 21 above the base plate 11 via the first connecting assembly 45 and the storage box 200. To ensure the stability of the connection between the pull rod 41 and the first support plate 21, the first connecting assembly 45 can be installed on both the first connecting rod 42 and the second connecting rod 43. Here, the first connecting assembly 45 installed on the first connecting rod 42 is described.

[0061] When the user needs to switch the cart 100 to the first state, as a feasible embodiment, the user can install the first support plate 21 on the base plate 11 via 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 base plate 11. The first connecting member 451 is connected to or formed on the first connecting rod 42, and the second connecting member 452 is connected to 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 using one or a combination of threads, mortise and tenon joints, screws, latches, and snap-on 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.

[0062] In this embodiment, the first connecting assembly 45 further includes a fastener 453, and the first connecting member 451 and the second connecting member 452 are connected by the fastener 453. As a specific embodiment, the first connecting member 451 is formed on the first connecting rod 42, and the second connecting member 452 is formed on the first support plate 21. The first connecting member 451 is formed with a first connecting hole 454 that passes through the first connecting member 451, and the second connecting member 452 is formed with a second connecting hole 455 that passes through the second connecting member 452. When the user needs to fix the pull rod 41 and the first support plate 21, the first connecting hole 454 and the second connecting hole 455 are first aligned, and then the fastener 453 is passed through the first connecting hole 454 and the second connecting hole 455, thereby fixing the first connecting member 451 and the second connecting member 452. When the user needs to separate the pull rod 41 from the first support plate 21, they only need to pull out the fastener 453 from the first connecting hole 454 and the second connecting hole 455, and the first connecting member 451 and the second connecting 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 and 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. The structure is simple and convenient for users to use. After the fastener 453 fixes the first connecting member 451 and the second connecting member 452, the gripping 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 grip the gripping rod 44 to push / pull the cart 100.

[0063] Please continue to refer to Figure 7The cart 100 further includes a bracket 46 that is detachably connected to the upper portion of the pull rod 41. The bracket 46 can be used to loop cables around the bracket 46, and 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 combinations of snap-on, thread, screw, mortise and tenon and latch. In this 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 to a first plug-in portion 461, and the second connecting rod 43 is connected to 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 a user needs to use the bracket 46, in one embodiment, the user can first pass one end of the bracket 46 through a through-hole, place a cable on the bracket 46, and then pass the other end of the bracket 46 through the other through-hole to connect the cable to the bracket 46. Of course, the cable here can also be another item 300. In another embodiment, the ends of the bracket 46 pass directly through the through-holes of the first connecting rod 42 and the second connecting rod 43. The user can use a hook to hang the item 300 on the bracket 46. When the user needs to use the item 300, they can simply remove it from the bracket 46. In another embodiment, the user can also remove the bracket 46 from the pull rod 41. When the user needs to hang or place certain items 300 on the bracket 46, they can then install the bracket 46 on the pull rod 41. This arrangement not only adds more space on the cart 100 for storing items 300, making it easier for the user to access or store items 300, but also has a simple structure and is easy to operate.

[0064] refer to Figure 3 As shown, the travel assembly 30 includes four wheels 31 mounted on the lower end of the base plate 11. The wheels 31 can be driven to rotate relative to the base plate 11. During the rotation process, the wheels 31 have a folded state and an extended state. When the wheels 31 are in the folded state, they are located in the lower groove 14 of the base plate 11 and separated from the ground. When the wheels 31 are in the extended state, they are in contact with the ground. With this arrangement, when the user wants to use the cart 100, they only need to switch the wheels 31 to the extended state, so that the user can push the wheels 31, thereby driving the cart 100. When the user wants to store the cart 100, they only need to switch the wheels 31 to the folded state, and the cart 100 can be stored in a storage area or placed in a pickup truck for transportation.

[0065] refer to Figures 5 to 14 As shown, the cart 100 also includes a second connecting assembly 50, which is used to connect the storage box 200 to the base plate 11. Alternatively, the first support plate 21 and the storage box 200 can be connected via the second connecting assembly 50. To ensure connection stability, second connecting assemblies 50 can be symmetrically installed at both ends of the base plate 11, the first support plate 21, and the storage box 200. A detailed description will be given using one of the second connecting assemblies 50 as an example. These opposing second connecting assemblies 50 can be referred to as a set of connecting devices.

[0066] The second connection assembly 50 includes a base 51, a driver 52, and an adapter 53. The driver 52 is mounted on the base 51 and is movable relative to the base 51. The driver 52 can be connected to or connected to the adapter 53. The base 51 can be connected to or formed on the cart 100. It is also understood that the base 51 can be connected to or formed on the base 11. As a possible embodiment, the base 51 is directly formed on the base 11, and multiple bases 51 can be provided on the base 11, that is, multiple sets of connection devices can be installed on the base 11. This configuration allows the user to connect multiple storage boxes 200 to the base 11.

[0067] 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 disengaged from the mating position. In this embodiment, the driving member 52 is connected to the base 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 driver 52 is in the hidden state, the driver 52 is separated from the adapter 53, and the top surface of the driver 52 in the vertical direction is lower than the upper surface 13 of the base 51 or is flush with the upper surface 13 of the base 51. With the above configuration, when the user wants to install the storage box 200 on the base 11, they only need to switch the driver 52 to the connected state. When the user does not need to use the second connecting assembly 50, they only need to switch the driver 52 to the hidden state. In this way, the user can stack other items 300 on the base 11 without damaging the second connecting assembly 50. Similarly, the second connecting assembly 50 will not interfere with the items 300, thereby increasing the functionality of the cart 100 and making it more convenient for the user. It should be noted that the adapter 53 does not necessarily need to be 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 driver 52.

[0068] Specifically, the base 51 is formed with a receiving cavity 511, in which the driver 52 can be disposed. The driver 52 can be received within the receiving cavity 511. The driver 52 is pivotally connected to the base 51 and can rotate relative to the base 51. When the user needs to switch the driver 52 to a connected state, the driver 52 is simply rotated upward to a mating position. When the user no longer needs to use the second connecting assembly 50, the driver 52 is simply rotated downward to a hidden position, i.e., flipped back into the receiving cavity 511.

[0069] The first support plate 21 can be mounted on the base plate 11. It is understood that the first support plate 21 and the base plate 11 can be spaced apart, or they can be directly connected. The first support plate 21 is spaced apart from the base plate 11, that is, the first support plate 21 is connected to the base plate 11 via the first connecting assembly 45 and the storage box 200. In the vertical direction, two sets of connecting devices are provided on the storage box 200. The storage box 200 has an upper top surface and a lower bottom surface that are arranged opposite each other. One set of connecting devices can be installed on the upper top surface of the storage box 200, and another set of connecting devices can be installed on the lower bottom surface. An adapter 53 can be installed on the lower bottom surface of the storage box 200, and a drive member 52 is installed on the base plate 11. The user connects the adapter 53 with the drive member 52 to connect the storage box 200 to the base plate 11. A driving member 52 can be installed on the 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, thereby mounting the first support plate 21 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 replace the support legs between the first support plate 21 and the bottom plate 11. With this arrangement, 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 each form a storage space. The user can directly place items 300 on the bottom plate 11 and the first support plate 21 without the need to install additional support legs, etc., which simplifies the structure and facilitates user operation.

[0070] The first support plate 21 can be directly mounted on the base plate 11 via the second connecting assembly 50. Specifically, the adapter 53 on the first support plate 21 can be directly connected to the drive member 52 on the base plate 11, thereby directly connecting the first support plate 21 to the base plate 11. At this point, the first support plate 21 is in the second state, meaning that the cart 100 becomes a single-layer cart 100, and the user can place items 300 directly on the first support plate 21. In another embodiment of the cart 100, the first support plate 21 is not mounted on the base plate 11, which can also be said to be in the third state. That is, a pull rod 41-type cart 100 is formed with a base plate 11. Users can also place items 300 on the base plate 11 and push / pull the cart 100 using 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 base 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 configuration suitable for the current working conditions according to the current working conditions, thereby facilitating use.

[0071] The cart 100 may also be connected to an external attachment assembly 60, which is used to attach an item 300 to the cart 100 and / or the storage box 200. The external attachment assembly 60 includes at least one external attachment 61, which includes a mounting portion 611 and a connecting portion 612. The mounting portion 611 is configured to detachably attach the item 300, and the connecting portion 612 is configured to be mounted on the cart 100 and / or the storage box 200. This allows the user to attach the item 300 to the storage box 200 or the cart 100. Furthermore, since the item 300 is attached to an external space, it is more convenient for the user to place or retrieve the item. The item 300 can be attached to the external attachment 61 through one or a combination of methods, such as plugging, hanging, snapping, and adsorption.

[0072] The external attachment assembly 60 also includes an intermediate piece 62 that can cooperate with the external attachment 61. The external attachment 61 is mounted to the cart 100 and / or the storage box 200 via the intermediate piece 62. One or more intermediate pieces 62 and external attachment 61 may be provided. The storage box 200, the base plate 11, and the first support plate 21 are each formed with a connecting section 63. The connecting section 63 is specifically formed at the corners of the storage box, the base plate 11, and the first support plate 21. A guardrail made of a metal material is embedded in the connecting section 63. One or more intermediate pieces 62 can be mounted on the connecting section 63. The intermediate pieces 62 can be connected to the connecting section 63 using one or a combination of screws, latches, rivets, and snap fasteners. In this embodiment, the intermediate piece 62 is mounted to the connecting section 63 using screws, i.e., the intermediate piece 62 is fixed to the connecting section 63 by screws. As will be appreciated, the connecting section 63 is formed with a connecting surface 631, which is provided with several positioning holes 632. The middle piece 62 is formed with mounting holes 621. Users can align the mounting holes 621 on the middle piece 62 with the corresponding positioning holes 632 as needed, and then secure the middle piece 62 to the connecting section 63 with screws. When the middle piece 62 is removable, one or more external components 61 can be installed. That is, the middle piece 62 can simultaneously be installed with multiple external components 61. The external components 61 can be connected to the middle piece 62 using one or a combination of screws, latches, rivets, and snap fasteners. In this embodiment, the external components 61 are mounted to the middle piece 62 using screws. There are multiple external components 61, including one or a combination of a battery pack hanger, a cable hanger, a ruler hanger, a support 64, and a power tool hanger. This allows users to install the desired items 300 on the storage box 200 or the cart 100 based on actual working conditions. As a feasible implementation method, the user can install the middle piece 62 on two adjacent connecting sections 63, and then connect one end of the support piece 64 to one middle piece 62 and the other end to the other middle piece 62. A plurality of spaced slots are provided on the support piece 64, and the user can use a hook to clip the tool into the slot.

[0073] The first support plate 21 includes a first surface 211, a second surface 212, and a third surface 213 located along the sidewalls of the first support plate 21. The first surface 211 is recessed downward to form a first groove 214, into which the user can place the storage box 200 or directly place items 300. The first surface 211 also has multiple recessed grooves 215, into which the user can place small items 300, such as saw blades, drill bits, and screws. The first surface 211 also has multiple recessed slots 216 for tools such as screwdrivers. The second and third surfaces 212 and 213 are positioned opposite each other. Both surfaces 212 and 213 feature adapters 53 for mating with the driver 52. Positioning features are also provided on the second and third surfaces 212 and 213, allowing the user to directly mount, hang, or attach accessories, tools, charging devices, power supplies, lighting devices, and the like to the second and third surfaces 212 and 213. The external component 61 can 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.

[0074] like Figure 6 As shown, as a feasible embodiment, the external attachment assembly 60 further includes one or more external attachments 71 and one or more fixing members 713 for attaching the external attachments 71 to the cart 100. The fixing members 713 can pass through the external attachments 71 and connect to the first support plate 21. The external attachment 71 includes a connecting portion 712 and a mounting portion 711. The mounting portion 711 is removably attached to the object 300, and the connecting portion 712 is connected to the fixing member 713, thereby fixing the external attachment 71 to the first support plate 21. The second surface 212 and / or the third surface 213 are each provided with a plurality of positioning slots. The connecting portion 712 is provided with a hole 714. When the fixing member 713 passes through the hole 714, it drives the external attachment 71 to be fixed to the desired positioning slot. In this embodiment, the fixing member 713 and the positioning slot can be threaded, that is, the fixing member 713 can be a screw. The external attachment 71 and the external attachment 61 can be installed on the cart 100 at the same time.

[0075] like Figures 15 to 18 The second specific embodiment of the first support plate 22 is shown. It should be noted that the second embodiment is basically the same as the first embodiment in terms of the structure of the cart 100, the structure of the storage box 200, and the structure of the external component 60. The second embodiment differs from the first embodiment 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 embodiment that differ from the first embodiment are described here. For other structures, please refer to the previous text and will not be repeated here. The first support plate 22 in the first embodiment and the first support plate 22 in the second embodiment can be switched between as needed during actual use.

[0076] 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 connecting assembly 50 .

[0077] The first support plate 22 specifically includes a first working plate 221, a second working plate 222, and a connecting plate 223 that connects the first working plate 221 and the second working plate 222. An adapter 53 that matches the driving member 52 is installed on each of the first working plate 221 and the second working plate 222.

[0078] Two storage boxes 200 are mounted on the base plate 11. Each storage box 200 is provided with two sets of connecting devices in the vertical direction. The storage boxes 200 have an upper top surface and a lower bottom surface that are disposed opposite each other. One set of connecting devices can be mounted on the upper top surface of the storage box 200, and another set of connecting devices can be mounted on the lower bottom surface. An adapter 53 can be mounted on the lower bottom surface of the storage box 200, and a driver 52 is mounted on the base plate 11. The user connects the adapter 53 with the driver 52 to connect the storage box 200 to the base plate 11. The driver 52 can be mounted on the upper top surface of the storage box 200. The adapter 53 on the first working plate 221 connects to the driver 52. Similarly, the adapter 53 on the second working plate 222 connects to the driver 52 on the other storage box 200, thereby attaching the first support plate 22 to the upper end of the storage box 200. At this point, the first support plate 22 is in the first state. In the first state, the cart 100 can be moved in two ways. In one embodiment, the user flips the pull rod 41 out of the lower groove 14 and moves the cart 100 by pushing or pulling the pull rod 41. In another embodiment, 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 the cart. 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 to cut workpieces, etc., or write or draw drawings on the first support plate 22.

[0079] The first support plate 22 can also be directly mounted on the base plate 11, that is, the driving member 52 on the base plate 11 is connected to the adapter 53 on the first support plate 22, thereby fixing the first support plate 22 to the base plate 11. In this case, the first support plate 22 is in the second state. Of course, the first support plate 22 can also be removed from the base plate 11, leaving only the base plate 11. In this case, the first support plate 22 is in the third state.

[0080] Connecting sections 63 are provided at the four corners of the first and second work panels 221, 222. The user can install the middle piece 62 on the connecting sections 63, and then install the external piece 61 in the middle. Accessory slots are provided around the first and second work panels 221, 222, and the user can place accessories in the accessory slots.

[0081] like Figure 4 As shown, in the present application, the storage box 200 can be provided with a sidewall opening 202. This allows the user to install a first support plate 22 in the storage box 200, using 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 items 300 in the storage box 200, they can directly open the storage box 200 from the sidewall, thereby avoiding the need for the user 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 provided on the sidewall of the storage box 200 for opening or closing the opening 202. The cover plate 203 can be connected to the body of the storage box 200 by sliding or rotating. The sliding connection here can be either forward and backward sliding or left and right sliding. The cover plate 203 can be a drawer 204, meaning that 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 203 may be a sliding door 205 that can be slid left or right by the user. The user moves the sliding door 205 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 left or right. Alternatively, the cover 203 may be a flip plate 206. The flip plate 206 and the storage box 200 body can be flipped upside down or left to right. In this way, to open the storage box 200, the user only needs to rotate the flip plate 206 to reveal the opening 202. The side walls here refer to the left side wall, right side wall, front side wall, and rear side wall that form the perimeter of the storage box 200. In addition, the storage box 200 may be provided with multiple cover plates 203, thereby dividing the interior of the storage box 200 into multiple storage spaces for easier storage and management by the user.

[0082] like Figure 3As shown, as a possible embodiment, the travel assembly 30 further includes an intermediate rod that connects the two wheels 31. That is, the cart 100 includes at least two intermediate rods, a first intermediate rod 32 and a second intermediate rod 33, each connected to each wheel 31. The intermediate rods are rotatable relative to the base plate 11, and during this rotation, they drive the wheels 31 to rotate. The base plate 11 is recessed upward from the bottom to form a lower groove 14. The intermediate rods are at least partially accommodated within the lower groove 14. As the wheels 31 rotate with the intermediate rods, they also rotate with the connecting rods into the lower groove 14, allowing them to be fully retracted. This allows the user to stow the wheels 31 within the lower groove 14 when the cart 100 is not in use, making it easier to store and transport. When the user needs to use the cart 100 for travel, they simply flip the wheels 31 out of the lower groove 14 for immediate use. In this embodiment, the wheels 31 are universal wheels, 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 wheels 31 can be provided with foot brakes.

[0083] The cart 100 also includes a locking device 34 that can cooperate with the travel assembly 30. Specifically, the locking device 34 is used to lock the connecting rod, thereby maintaining the travel wheel 31 in its current state, preventing 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 portion 321 and a second adapter portion 322 that can cooperate with the first operating rod 341, a third adapter portion 331 and a fourth adapter portion 332 that can cooperate with the second operating rod 342, and a housing 344. The housing 344 is mounted to the lower end of the base plate 11, or in other words, the housing 344 is disposed within the lower recess 14. The first operating rod 341 and the second operating rod 342 are at least partially disposed within the housing 344. The elastic member 343 is disposed within the housing 344, with one end of the elastic member 343 connected to the first operating rod 341 and the other end of the elastic member 343 connected to the second operating member. The first adapting portion 321 and the second adapting portion 322 are provided on the first intermediate rod 32, and the third adapting portion 331 and the fourth adapting portion 332 are provided 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 engaging portion 345 capable of engaging with the first adapting portion 321 or the second adapting portion 322. The second operating rod 342 is formed with a second operating portion 348 operable by a user and a second engaging portion 346 capable of engaging with the third adapting portion 331 or the fourth adapting portion 332. When the wheel 31 is in the 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, and 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. In 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 move the first operating part 347 and the second operating part 348 towards each other, and then flip the wheel 31 inward until the first clamping part 345 is clamped with the first adapter part 321 and the second clamping part 346 is clamped with the third adapter part 331.

[0084] The first adapter portion 321 or the second adapter portion 322 is specifically formed in two holes on the first intermediate rod 32, and the third adapter portion 331 or the fourth adapter portion 332 is also formed in two holes 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.

[0085] As another specific embodiment of the locking device, Figures 20 to 25 As shown, the bottom plate, wheels and middle rod are basically the same as those in the previous embodiment. Only the different parts are described below.

[0086] like Figures 20 to 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 limiting component 431 and a locking component 441. The limiting component 431 is used to cooperate with the middle rod 412 to limit the rotation of the middle rod 412. The locking component 441 cooperates with the limiting component 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 stack 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, high-intensity vibrations will be generated when the user pushes the cart 100. In this way, the wheels 411 will often be unable to withstand such high-intensity vibrations, and the wheels 411 will be out of the driving state, making the cart 100 unusable. By setting the structural setting of the limit assembly 431 and the locking assembly 441, the wheels 411 can always be kept in the driving state.

[0087] The limiting assembly 431 includes an adapter 432 and a base 33. The base 33 is connected to or integrally formed with the bottom plate 421. The adapter 432 is connected to the base 33 and is rotatable 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, and 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 movement. The intermediate rod 412 is at least partially in contact with the base 33 and is rotatable 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 is fixed to its current position and cannot rotate. In other words, when the adapter 432 is in the first position, the adapter 432 and the base 33 restrict 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.

[0088] As a feasible embodiment, 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 latching portion 444 for the hook member 443 is provided on one end of the adapter 432. The hook member 443 has a locked state and a released state relative to the adapter 432. When the hook member 443 is in the locked 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 separated from the base 33 .

[0089] 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 released state to the locked 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 intermediate rod 412 abut against each other. At this time, the hook member 443 is in the locked state. When the hook member 443 is in the locked state, the wheel 411 can be in the driving state or the folded state.

[0090] As a feasible embodiment, the limiting 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.

[0091] Specifically, the limiting assembly 431 includes two positioning pins, 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. When the wheel 411 is in the folded state, the second positioning pin 435 abuts against the adapter 432. By providing 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.

[0092] The adapter 432 is formed with an adapter portion 438 that mates with the locating pin. When the locating pin contacts the adapter portion 438, the wheel 411 remains in its current position. When the adapter portion 438 mates with the first locating pin 434, the wheel 411 is in the driving position. When the adapter portion 438 mates with the second locating pin 435, the wheel 411 is in the folded position. The base 33 is formed with a first stop portion 436 and a second stop portion 437 that mate with the locating pin. The first stop portion 436 and the second stop portion 437 are respectively provided at opposite ends of the base 33. It is understood that the first stop portion 436 and the second stop portion 437 are provided on both sides of the intermediate 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 stop 436. When the wheel 411 is in the folded state, the first positioning pin 434 contacts the second stop 437, and the second positioning pin 435 contacts the adapter 438. In this arrangement, when the wheel 411 is in the driving state, the cooperation between the positioning pins, the base 33, and the adapter 432 prevents the intermediate rod 412 from rotating.

[0093] 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 in the adapter 432, and the guide portion 439 is an inclined arc surface. In this arrangement, 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, allowing the guide portion 439 to adjust the position of the positioning pin until the positioning pin is guided by the guide portion 439 and then inserted into the adapter 438.

[0094] As a method of use, when the user wants to switch the wheel 411 from the folding state to the driving state, the hook part 443 is in a locked state, the first positioning pin 434 contacts the second stop part 437, the second positioning pin 435 contacts the adapter part 438, and the adapter part 432 is in the first state. The user operates the cam member 442 to rotate upward to cancel the force applied by the hook member 443 to the adapter 432 and the base 33. 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. Continue to rotate the intermediate rod 412 until the first stop portion 436 contacts the first positioning pin 434. At this time, rotate the adapter 432 to make the guide portion 439 on the adapter 432 contact the second positioning pin 435. Continue to rotate the adapter 432 to insert the second positioning pin 435 into the adapter 438. At this time, the adapter 432 rotates to the second state. The user rotates the hook 443 so that it fits over the engaging portion 444. The user then rotates the cam downward, causing the cam to move the hook 443 downward until the engaging portion is locked. The hook 443 then applies a force between the adapter 432 and the base 33, thereby reducing the gap between the base 33, the adapter 432, and the intermediate rod 412. This ensures that the cart 100 remains in a stable state during use, preventing vibrations from causing the wheels 411 to shift from the driving state to the folded state. This ensures the structural stability of the cart 100.

[0095] 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. The structure and principle of the locking devices 430 are basically the same and will not be described in detail here.

[0096] As a specific embodiment of other locking devices, such as Figures 25 to 29 As shown, the bottom plate 421, the wheels 411 and the middle rod 412 are basically the same as those in the previous embodiment, and the bottom plate 421, the wheels 411 and the middle rod 412 use the same reference numerals as those in the previous embodiment.

[0097] 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.

[0098] The locking assembly 451 includes a support member 452, a handle 453, and a latch 454. The support member 452 can be driven to rotate, and during the rotation of the support member 452, the support member 452 can cooperate with the intermediate rod 412. The handle 453 can be driven by the user, and the handle 453 is connected to the support member 452. That is, when the handle 453 rotates, the support member 452 can rotate accordingly. The latch 454 is connected to the base plate 421 and is used to cooperate with the handle 453 to maintain the handle 453 in its current position. When the latch 454 is separated from the handle 453, the handle 453 can drive the support member 452 to rotate.

[0099] 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. The handle 453 and the abutment 452 are connected to the base via the connecting pin, thereby causing the handle 453, the connecting pin, and the abutment 452 to rotate synchronously. The positioning member 455 cooperates with the abutment 452 to maintain the intermediate rod 412 in its current position. The positioning member 455 is sleeved on the outer periphery of the intermediate rod and rotates with the intermediate rod 412. The positioning member 455 is formed with the aforementioned adapter 457, and the driving member is formed with a cam portion 456. During the rotation of the abutment 452, the cam portion 456 will interfere with the adapter portion 457. When the cam portion 456 abuts the adapter portion 457, the wheel 411 remains in its current position. When the cam portion 456 separates from the adapter portion 457, the intermediate rod 412 can rotate without being driven.

[0100] Positioning member 455 has a roughly rectangular cross-section. In one embodiment, positioning member 455 and the intermediate member are two separate parts that rotate synchronously when assembled. In another embodiment, positioning member 455 and intermediate rod 412 are integrally formed, meaning intermediate rod 412 has a roughly rectangular cross-section. Cam portion 456 is roughly arc-shaped. This creates a larger interference fit between the abutting member and positioning member 455 when cam portion 456 abuts the adapter, further enhancing the structural stability of the abutting member 452 and positioning member 455.

[0101] The locking device 450 also includes a limiting assembly 461, which is used to guide the positioning member 455 to rotate to a preset position, thereby facilitating interference fit between the abutting member 452 and the positioning member 455. The limiting assembly 461 is connected to the base and can be driven to rotate along with the abutting member 452. The limiting assembly 461 includes a guide member 462, which is connected to the connecting pin and 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 a direction perpendicular to the extension of the intermediate rod 412. The guide member 462 is generally U-shaped. When the wheel 411 is in motion, the positioning member 455 is at least partially disposed in the middle of the guide member 462, and the abutting member 452 is located at the lower end of the positioning member 455. In other words, during rotation, the guide member 462 and the abutting member 452 first contact the positioning member 455. 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 predetermined position, thereby facilitating an interference fit between the abutting member 452 and the positioning member 455.

[0102] As a method of use, when the user wants to switch the wheel 411 from the folding state to the driving state, the handle 453 is engaged with the latch 454, the guide 462 is at least partially in contact with the positioning member 455, and the supporting member 452 and the positioning member 455 are in interference. The user operates the handle 453 to separate the handle 453 from the latch 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, and 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 intermediate 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 at least partially in contact with the positioning member 455, and the handle 453 is continued to be rotated upward until the latch 454 of the handle 453 is engaged, and at this time the supporting member 452 is in interference contact with the positioning member 455.

[0103] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A cart suitable for storing boxes, comprising: A traveling assembly comprising wheels and an intermediate rod connecting the wheels; A base plate assembly, comprising a base plate, the walking assembly being at least partially connected to the base plate assembly, the wheels rotating relative to the base plate, and during the rotation of the wheels having at least a driving state and a folded state, wherein when the wheels are in the driving state, the wheels are configured to allow the base plate to move, and when the wheels are in the folded state, the wheels are stored under the base plate; It is characterized by: The stroller further includes a locking device configured to control the wheels to switch between the driving state and the folding state; The locking device comprises: an adapter, connected to the base plate, the adapter comprising an adapter portion, and configured to be connected to the intermediate rod after being rotated through a preset angle; A positioning pin is connected to the intermediate rod, and the positioning pin abuts against the adapter after the adapter rotates by a preset angle. When the positioning pin abuts against the adapter, the wheel remains in the current state.

2. The cart according to claim 1, wherein: The cart further comprises a support plate for placing articles, and the support plate is spaced apart from the bottom plate by support legs.

3. The cart according to claim 1, wherein: The cart further comprises a pull rod, a support plate for placing articles, and a storage box for storing articles. The support plate is spaced apart from the bottom plate via the storage box and the pull rod.

4. The cart according to claim 1, wherein: The locking device further includes a limiting assembly, which includes the adapter and a base rotatably connected to the adapter. The base cooperates with the adapter to limit the rotation of the intermediate rod.

5. The cart according to claim 4, wherein: The locking device further includes a locking assembly, which includes a cam member and a hook member. The cam member is rotatably connected to the base, and the hook member is connected to the cam member. The hook member and the cam member cooperate to connect the adapter and the base.

6. The cart according to claim 4, wherein: The intermediate rod is provided with two positioning pins, which are positioned as a first positioning pin and a second positioning pin. The base is provided with a first stop portion and a second stop portion that cooperate with the positioning pins. When the wheel is in the driving state, the first positioning pin contacts the adapter portion, and the second positioning pin contacts the first stop portion. When the wheel is in the folded state, the first positioning pin contacts the second stop portion, and the second positioning pin contacts the adapter.

7. The cart according to claim 6, wherein: The first positioning pin and the second positioning pin are arranged in a circumferential direction of the intermediate rod.

8. The cart according to claim 6, wherein: The intermediate rod is rotated to a preset position, and the adapter is rotated by a preset angle so that the first positioning pin contacts the adapter part. After the second positioning pin contacts the first stop part, the hook part contacts and abuts against the adapter, thereby switching the wheel to the driving state.

9. The cart according to claim 1, wherein: The adapting portion is a hole through which the positioning pin portion can pass.

10. The cart according to claim 1, wherein: The adapter also includes a guide portion, which is configured to guide the positioning pin to slide into the adapter portion.

Images