Folding trolley

Abstract

A folding trolley. The folding and unfolding of a trolley frame is realized by means of side link assemblies (30), a front link assembly (40) and a rear link assembly (50), which are foldable, and a folding chassis (60). The varying of the overall length of each of telescopic support rods (20) is achieved by means of an outer tube (21) and an inner column (22) that are slidably connected, and the telescopic support rods (20) each establish an association with at least one of the side link assemblies (30), the front link assembly (40) and the rear link assembly (50) by means of bottom connecting portions (23), such that the trolley frame (10) has a first state in which when corresponding link assemblies are unfolded, the bottom connecting portions (23) drive inner columns (22) to ascend under the action of corresponding links, and a second state in which when the corresponding link assemblies are folded, the bottom connecting portions (23) drive the inner columns (22) to descend under the action of the corresponding links.

Description

A folding handcart Technical Field

[0001] This utility model relates to the field of handcart technology, and in particular to a folding handcart. Background Technology

[0002] As people's living standards improve, their desire for outdoor activities is growing stronger, and their demands for convenience are increasing. When engaging in outdoor activities, it is necessary to transport some odds and ends required for the activity. At this time, folding trolleys that are easy to fold and carry have emerged.

[0003] Chinese utility model patent CN201712643U discloses a bundled luggage cart, including a foldable frame structure hinged by connecting rods. The frame has four vertical support legs, which are telescopic rod structures. Each of the two sides of the frame has two sets of four-bar linkages hinged together. An upper bracket is fixed to the upper end of each vertical support leg, and a lower bracket is fixed to the lower end. The upper bracket is fixed to the upper end of the inner tube of the vertical support leg, and the lower bracket is fixed to the lower end of the outer tube. The inner tube is inserted into the outer tube. The connecting rods are respectively connected to the upper and lower ends of the vertical support legs. When the frame is unfolded, the two ends of the four-bar linkages approach each other on the vertical support legs, causing the inner tube to insert into the outer tube, resulting in a relatively large internal space for the frame.

[0004] However, this structure also brings some problems: when the frame is folded, the two ends of the four-bar linkage move away from each other on the vertical support legs, causing the inner tube to extend beyond the outer tube. This results in the frame being taller in the folded state than in the unfolded state, requiring more storage space when folded. Conversely, if the inner tube in the vertical support legs is removed and the two ends of the four-bar linkage are directly connected to the two ends of the outer tube, the length of the links in the four-bar linkage needs to be shortened, leading to a smaller internal space in the unfolded state. Therefore, the folding stroller in the aforementioned patent cannot simultaneously achieve a large internal space in the unfolded state and a small storage space in the folded state.

[0005] Therefore, a new folding handcart needs to be designed.

[0006] Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the inability of existing folding trolleys to balance the large internal space in the unfolded state and the small storage space in the folded state, thereby providing a folding trolley.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A folding trolley includes a frame, wheels, and a traction unit, wherein the wheels are located at the bottom of the frame, and the frame includes...

[0010] Telescopic support rods are located at the four corners of the vehicle frame, and their bottoms are connected to the wheels at the corresponding positions.

[0011] A foldable side link assembly is located on the side of the frame and is connected to two of the telescopic support rods respectively.

[0012] A foldable front linkage assembly is located on the front side of the frame and is connected to the two telescopic support rods respectively;

[0013] A foldable rear linkage assembly is located at the rear of the frame and is connected to the two telescopic support rods respectively.

[0014] A folding chassis is located at the bottom of the vehicle frame and is connected to the retractable support rods at the four corners.

[0015] The retractable support rod includes an outer tube, an inner column, a top connecting part, and a bottom connecting part. The inner column is slidably connected to the outer tube. The top connecting part is fixedly connected to the top end of the outer tube. The bottom connecting part is slidably sleeved on the outer tube. The outer tube is provided with a vertical groove. The bottom connecting part is connected to the inner column through the vertical groove.

[0016] The link ends of at least one of the side link assembly, the front link assembly, and the rear link assembly are respectively hinged to the top connection portion and the bottom connection portion, so that the frame has

[0017] When the corresponding linkage assembly unfolds, the bottom connecting part, under the action of the corresponding linkage, drives the inner column to rise in a first state; and

[0018] When the corresponding link assembly is retracted, the bottom connecting part drives the inner column to descend in the second state under the action of the corresponding link.

[0019] Preferably, the bottom connecting part includes a first body and a connector for connecting with the inner column, the first body having a through hole to allow the bottom connecting part to be slidably sleeved on the outer tube;

[0020] The first body has a first connecting hole, and the connector passes through the first connecting hole and the vertical slot and is fixedly connected to the second connecting hole on the inner column; when the bottom connecting part moves along the outer tube, the connector moves in the vertical slot.

[0021] Preferably, the bottom connecting portion further includes two first connecting frames forming a predetermined angle, the first connecting frames being connected to the first body;

[0022] The first connecting bracket is used to hinge with a link in the side link assembly, the front link assembly, or the rear link assembly.

[0023] Preferably, the side link assembly includes a first side link hinged to the top connection and a second side link hinged to the bottom connection; and / or

[0024] The front link assembly includes a first front link hinged to the top connection and a second front link hinged to the bottom connection.

[0025] Preferably, the side link assembly, the front link assembly, and the rear link assembly each include a plurality of links that are cross-connected, and the number of links in the side link assembly is greater than the number of links in the front link assembly and greater than the number of links in the rear link assembly;

[0026] The height of the side link assembly, the front link assembly, and the rear link assembly after the frame is folded is no greater than the height of the retractable support rod.

[0027] Preferably, the rear link assembly includes a first rear link hinged to the top connection and a second rear link hinged to the bottom connection.

[0028] Preferably, the rear linkage assembly further includes rear uprights located on both sides of the intersecting linkages, the ends of the linkages being hinged to the rear uprights, the upper portions of the rear uprights being detachably connected to the top connecting portions of the two telescopic support rods, and the lower portions of the rear uprights being hinged to the bottom of the two telescopic support rods.

[0029] The top connecting part includes a hinge groove for hinged connection of the side connecting rod assembly and a locking groove for engaging with the upper part of the rear upright.

[0030] When the frame is deployed, the upper part of the rear link assembly can be separated from the telescopic support rod, allowing the rear link assembly to flip downward relative to the telescopic support rod.

[0031] Preferably, the rear linkage assembly includes two connecting ropes, one end of which is connected to the rear upright and the other end of which is connected to the telescopic support rod.

[0032] Preferably, the folding chassis includes at least two sets of X-shaped linkages, adjacent X-shaped linkages are hinged to each other, and are hinged to the bottom of the retractable support rod at the corresponding position.

[0033] Preferably, the connection between the two sets of X-shaped linkages is provided with a hinge and a connecting rod, one end of the connecting rod is connected to the hinge, and the other end is slidably connected to the lower hinge of the connecting rod of the side linkage assembly.

[0034] The connecting rod is provided with a vertical groove, and the connecting shaft at the lower hinge passes through the groove. When the frame is unfolded, the connecting shaft is located at the top of the groove; when the frame is folded up, the connecting shaft is located at the bottom of the groove.

[0035] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0036] The folding trolley provided in the above technical solution utilizes foldable side link assemblies, front link assemblies, rear link assemblies, and a folding chassis to achieve folding and unfolding of the frame. The telescopic support rod achieves overall length variation through a slidingly connected outer tube and inner column, and is associated with at least one of the side link assemblies, front link assemblies, and rear link assemblies via a bottom connecting part. When these foldable link assemblies are folded or unfolded, their ends move away from or towards each other. Therefore, when the frame unfolds, the side link assemblies, front link assemblies, and rear link assemblies also unfold accordingly. The bottom connecting part, under the action of the corresponding link, drives the inner column upward, and the frame unfolds... When fully extended, the inner column also rises to its highest point, maximizing the overall height of the retractable support rod. At this point, the internal space of the frame is larger than when the inner column is not present. When the frame is folded, the side linkage assembly, front linkage assembly, and rear linkage assembly also retract accordingly. The bottom connection, under the action of the corresponding linkages, causes the inner column to descend. When the frame is folded to its minimum, the inner column is almost completely retracted into the outer tube, minimizing the overall height of the retractable support rod. With the folding widths of the side linkage assembly, front linkage assembly, and rear linkage assembly all being the same, the folding height of the frame is minimized. Therefore, the storage space required for the folded frame is smaller. This folding trolley of the present invention balances a large internal space in the extended state and a small storage space in the folded state, and its simple structure makes it easy for users to operate. Attached Figure Description

[0037] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 is a structural schematic diagram of the handcart in the folded state according to Embodiment 1 of this utility model;

[0039] Figure 2 is a structural schematic diagram of the handcart in the unfolded state of Embodiment 1 of this utility model;

[0040] Figure 3 is an enlarged structural diagram of point A in Figure 2;

[0041] Figure 4 is an enlarged structural diagram of point B in Figure 2;

[0042] Figure 5 is a schematic diagram of the folding process of the handcart in Embodiment 1 of this utility model;

[0043] Figure 6 is a schematic diagram of the handcart in Embodiment 2 of this utility model;

[0044] Figure 7 is an enlarged structural diagram of point C in Figure 6.

[0045] Explanation of reference numerals in the attached drawings: 10. Frame; 11. Accommodation space; 20. Telescopic support rod; 21. Outer tube; 211. Vertical slot; 22. Inner column; 23. Bottom connecting part; 231. First body; 232. Connector; 233. First connecting frame; 234. Through hole; 235. First connecting hole; 24. Top connecting part; 241. Second body; 242. Through hole; 243. Second connecting frame; 244. Hinge slot; 245. Slot; 30. Side link assembly; 31. First side link; 32. Second side link; 33. Connecting shaft; 40. Front link assembly; 41. First front link; 42. Second front link; 50. Rear link assembly; 51. First rear link; 52. Second rear link; 53. Rear upright; 54. Connecting rope; 60. Folding chassis; 61. X-type linkage assembly; 611. Central connection; 612. Outer linkage; 62. Hinge; 63. Connecting rod; 631. Slide groove; 70. Wheel; 71. Front wheel; 72. Rear wheel; 73. First mounting seat; 74. Second mounting seat; 80. Traction unit; 81. Handle; 82. Handle lever; 83. Handle linkage; 84. Connecting seat. Detailed Implementation

[0046] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0047] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] As shown in Figures 1 to 7, this utility model embodiment provides a folding trolley, including a frame 10, wheels 70 and a traction unit 80. The wheels 70 are located at the bottom of the frame 10 and are used to facilitate the movement of the folding trolley. The wheels 70 can be directional wheels or swivel wheels, wide wheels or narrow wheels, and wheels with or without brakes.

[0050] The frame 10 is a foldable frame 10, which can be unfolded to form a storage space 11 for storing items, and can also be folded up to reduce the footprint and make it easy to store. Specifically, the frame 10 includes telescopic support rods 20, foldable side link assemblies 30, front link assembly 40, rear link assembly 50, and a folding chassis 60. The telescopic support rods 20 are located at the four corners of the frame 10, and their bottoms are connected to the corresponding wheels 70, serving as supports connecting the various surfaces of the frame 10. The side link assemblies 30 are located on the sides of the frame 10 and are connected to two telescopic support rods 20 respectively. That is, there are two sets of side link assemblies 30, located on two sides of the frame 10 and connected to two telescopic support rods 20 on the corresponding sides. When the side link assembly 30 is folded, the two telescopic support rods 20 on the corresponding sides move closer to each other along the folding direction. When the side link assembly 30 is unfolded, the two telescopic support rods 20 on the corresponding sides move further apart along the unfolding direction. The side link assembly 30 serves as a side support for the accommodating space 11. Similarly, the front link assembly 40 is located on the front side of the frame 10 and is connected to two telescopic support rods 20. When the front link assembly 40 is folded, the two telescopic support rods 20 on the front side of the frame 10 move closer to each other in the folding direction. When the front link assembly 40 is unfolded, the two telescopic support rods 20 on the front side of the frame 10 move further apart in the unfolding direction. The front link assembly 40 serves as the front support for the accommodating space 11. The rear link assembly 50 is located on the rear side of the frame 10 and is connected to two telescopic support rods 20. When the rear link assembly 50 is folded, the two telescopic support rods 20 on the rear side of the frame 10 move closer to each other in the folding direction. When the rear link assembly 50 is unfolded, the two telescopic support rods 20 on the rear side of the frame 10 move further apart in the unfolding direction. The rear link assembly 50 serves as the rear support for the accommodating space 11. The folding chassis 60 is located at the bottom of the frame 10 and is connected to the four retractable support rods 20 at the corners. When the frame 10 is unfolded, the folding chassis 60 is also unfolded, serving as the bottom support for the storage space 11. When the frame 10 is folded and closed, the folding chassis 60 is also folded and closed.

[0051] To expand the storage space 11 when the frame 10 is unfolded, on the one hand, the width of the side link assembly 30, the front link assembly 40, and the rear link assembly 50 when unfolded can be increased, that is, the length and width of the storage space 11 can be increased. This means that increasing the number of links or the length of a single link will lead to a significant increase in the weight of the frame 10, and will also lead to a larger storage volume when the frame 10 is folded. On the other hand, the height of the support rod can be increased, that is, the height of the storage space 11 can be increased. Similarly, simply increasing the height of the support rod will also lead to a larger storage volume when the frame 10 is folded.

[0052] To address the aforementioned issues, in this embodiment, the retractable support rod 20 includes an outer tube 21, an inner column 22, a top connecting part 24, and a bottom connecting part 23. The inner column 22 is slidably connected to the outer tube 21, the top connecting part 24 is fixedly connected to the top end of the outer tube 21, and the bottom connecting part 23 is slidably sleeved on the outer tube 21. The outer tube 21 has a vertical slot 211, and the bottom connecting part 23 is connected to the inner column 22 through the vertical slot 211. The connecting rod ends of at least one of the side link assembly 30, the front link assembly 40, and the rear link assembly 50 are respectively hinged to the top connecting part 24 and the bottom connecting part 23, so that the frame 10 has a first state in which the bottom connecting part 23 drives the inner column 22 to rise under the action of the corresponding link when the corresponding link assembly is extended; and a second state in which the bottom connecting part 23 drives the inner column 22 to fall under the action of the corresponding link when the corresponding link assembly is retracted. The telescopic support rod 20 achieves overall length variation through a sliding connection between the outer tube 21 and the inner column 22, and is associated with at least one of the side link assembly 30, the front link assembly 40, and the rear link assembly 50 via the bottom connecting part 23. When these foldable link assemblies are folded or unfolded, their ends move away from or towards each other. Thus, when the frame 10 is unfolded, the side link assembly 30, the front link assembly 40, and the rear link assembly 50 also unfold accordingly. Under the action of the corresponding links, the bottom connecting part 23 causes the inner column 22 to rise. When the frame 10 is fully unfolded, the inner column 22 also rises to its highest point, and the overall height of the telescopic support rod 20 is at its maximum. When the frame 10 is unfolded, its internal space is larger than when the inner column 22 is not present. When the frame 10 is folded, the side link assembly 30, front link assembly 40, and rear link assembly 50 also fold accordingly. Under the action of the corresponding link, the bottom connecting part 23 drives the inner column 22 to descend. When the frame 10 is folded to its smallest size, the inner column 22 is also almost completely retracted into the outer tube 21, and the overall height of the telescopic support rod 20 is at its shortest. With the folding width of the side link assembly 30, front link assembly 40, and rear link assembly 50 being the same, the folding height of the frame 10 is minimized. Therefore, the storage space required for the frame 10 in the folded state is smaller. This utility model of a folding trolley takes into account both the large internal space in the unfolded state and the small storage space in the folded state, and has a simple structure that is convenient for users to operate.

[0053] When controlling the inner column 22 to rise and fall relative to the outer tube 21, a force can be applied directly to the bottom connecting part 23 on the telescopic support rod 20 to drive the inner column 22 to rise and fall. Alternatively, a force can be applied directly to the inner column 22 to drive the bottom connecting part 23 to rise and fall. The bottom connecting part 23 can be moved on the outer tube 21 by unfolding or folding at least one of the side connecting rod assembly 30, front connecting rod assembly 40 and rear connecting rod assembly 50 connected to the bottom connecting part 23, thereby driving the inner column 22 to rise and fall.

[0054] As shown in Figures 1 to 5, in Embodiment 1, for the bottom connecting part 23 on the retractable support rod 20 connected to the front wheel 71, the connecting rod ends of the side connecting rod assembly 30 on one side and the connecting rod ends of the front connecting rod assembly 40 on the same side are simultaneously connected to the bottom connecting part 23 on the corresponding side. Thus, when the corresponding connecting rod assembly is extended, the bottom connecting part 23 drives the inner column 22 to rise under the action of the corresponding connecting rod. When the corresponding connecting rod assembly is retracted, the bottom connecting part 23 drives the inner column 22 to fall under the action of the corresponding connecting rod, making the operation more convenient and effortless. For the bottom connection part 23 on the retractable support rod 20 connected to the rear wheel 72, the connecting rod end of the side link assembly 30 on one side and the connecting rod end of the rear link assembly 50 on the same side are simultaneously connected to the bottom connection part 23 on the corresponding side. Thus, when the corresponding link assembly is extended, the bottom connection part 23 drives the inner column 22 to rise under the action of the corresponding link. When the corresponding link assembly is retracted, the bottom connection part 23 drives the inner column 22 to fall under the action of the corresponding link, making the operation more convenient and effortless.

[0055] In this embodiment, the top connecting part 24 on each telescopic support rod 20 has a basically the same structure, and the bottom connecting part 23 on each telescopic support rod 20 also has a basically the same structure.

[0056] Specifically, as shown in Figure 3, the bottom connecting part 23 includes a first body 231, a connector 232 for connecting with the inner column 22, and a first connecting bracket 233 forming a set angle. The first body 231 has a through hole 234 so that the bottom connecting part 23 can be slidably sleeved on the outer tube 21. The first body 231 has a first connecting hole 235, and the connector 232 passes through the first connecting hole 235 and the vertical slot 211 to be fixedly connected to the second connecting hole on the inner column 22. When the bottom connecting part 23 moves along the outer tube 21, the connector 232 moves in the vertical slot 211, thereby driving the inner column 22 to rise and fall in the outer tube 21. The connector 232 can be a fixing screw, and at least one of the first connecting hole 235 and the second connecting hole can be a screw hole.

[0057] As shown in Figure 4, the first connecting frame 233 is connected to the first body 231. Generally, the included angle between the two first connecting frames 233 is 90°. It should be noted that due to manufacturing errors, the included angle can be a range value, fluctuating within an allowable error of around 90°. The first connecting frame 233 is used to hinge with the connecting rods in the side link assembly 30, front link assembly 40, or rear link assembly 50. For example, for the bottom connection portion 23 on the retractable support rod 20 connected to the front wheel 71, the side link assembly 30 includes a first side link 31 hinged to the top connection portion 24 and a second side link 32 hinged to the bottom connection portion 23; the front link assembly 40 includes a first front link 41 hinged to the top connection portion 24 and a second front link 42 hinged to the bottom connection portion 23. One of the first connecting frames 233 on one bottom connection portion 23 is hinged to one of the second side links 32, and the other... A first connecting frame 233 is hinged to a second front link 42; for the bottom connecting portion 23 on the retractable support rod 20 connected to the rear wheel 72, the side link assembly 30 includes a first side link 31 hinged to the top connecting portion 24 and a second side link 32 hinged to the bottom connecting portion 23; the rear link assembly 50 includes a first rear link 51 hinged to the top connecting portion 24 and a second rear link 52 hinged to the bottom connecting portion 23, one of the first connecting frames 233 on a bottom connecting portion 23 is hinged to a second side link 32, and the other first connecting frame 233 is hinged to a second rear link 52.

[0058] As shown in Figures 3 and 4, the top connecting part 24 includes a second body 241 and a second connecting frame 243 forming a set angle. The second body 241 is fixedly connected to the top end of the outer tube 21 by screws and has a through hole 242 for the inner column 22 to pass through. The second connecting frame 243 is connected to the second body 241, and its set angle is basically the same as the set angle between the first connecting frame 233 of the bottom connecting part 23 on the same telescopic support rod 20. The second connecting bracket 243 is used to hinge with a link in the side link assembly 30, the front link assembly 40, or the rear link assembly 50. For example, for the top connection portion 24 on the retractable support rod 20 connected to the front wheel 71, the side link assembly 30 includes a first side link 31 hinged to the top connection portion 24 and a second side link 32 hinged to the top connection portion 24; the front link assembly 40 includes a first front link 41 hinged to the top connection portion 24 and a second front link 42 hinged to the top connection portion 24. One of the second connecting brackets 243 on one top connection portion 24 is hinged to one of the first side links 31, and the other... A second connecting frame 243 is hinged to a first front link 41; for the top connection portion 24 on the retractable support rod 20 connected to the rear wheel 72, the side link assembly 30 includes a first side link 31 hinged to the top connection portion 24 and a second side link 32 hinged to the top connection portion 24; the rear link assembly 50 includes a first rear link 51 hinged to the top connection portion 24 and a second rear link 52 hinged to the top connection portion 24, one of the second connecting frames 243 on one top connection portion 24 is hinged to a first side link 31, and the other second connecting frame 243 is hinged to a first rear link 51.

[0059] As shown in Figures 2 and 5, the side link assembly 30, the front link assembly 40, and the rear link assembly 50 each include several cross-connected links, and the number of links in the side link assembly 30 is greater than the number of links in the front link assembly 40 and the number of links in the rear link assembly 50; for example, the side link assembly 30 has 8 links, including the first side link 31 and the second side link 32 mentioned above; the front link assembly 40 has 4 links, including the first front link 41 and the second front link 42 mentioned above; and the rear link assembly 50 has 4 links, including the first rear link 51 and the second rear link 52 mentioned above. The purpose of this design is that the traction component is generally located on the front side of the frame 10, and the front and rear sides of the frame 10 are narrower than the left and right sides, making it easier for users to push, pull, and fold the stroller. In addition, the increased number of links also makes the unfolded length of the side link assembly 30 longer, and the storage space 11 of the frame 10 larger. At the same time, the height of the side link assembly 30, the front link assembly 40, and the rear link assembly 50 after the frame 10 is folded is not greater than the height of the telescopic support rod 20, thereby ensuring the height of the frame 10 after folding. By reasonably arranging the link distribution of the side link assembly 30, the width of the side link assembly 30 after folding can also be smaller, thereby making the storage volume of the frame 10 smaller.

[0060] As shown in Figures 2 and 5, in this embodiment, the traction unit 80 includes a handle 81, a handle bar 82, and a handle connecting rod 83. The handle 81 is located at the top of the handle bar 82. The handle bar 82 can be a telescopic structure. When the frame 10 is in the unfolded state, the overall length of the handle bar 82 can be increased to facilitate pushing and pulling the folding trolley. When the frame 10 is in the folded state, the overall length of the handle bar 82 can be shortened to further reduce the folded volume. The bottom of the handle bar 82 is hinged to the top of the two wheels 70, which serve as the front wheels 71, via the handle connecting rod 83. Specifically, the top of the front wheels 71 is fixed with a first mounting seat 73. There are two handle connecting rods 83, one end of which is hinged to the first mounting seat 73, and the other end is hinged to the connecting seat 84 at the bottom of the handle bar 82. When the frame 10 is folded up, the connecting seat 84 moves downward, causing part of the handle connecting rod 83 to be placed between the two front wheels 71. The first mounting seats 73 on both sides move closer to each other as the front wheels 71 approach each other, located on both sides of the handle bar 82.

[0061] As shown in Figures 2 and 5, in this embodiment, the folding chassis 60 includes at least two sets of X-shaped linkage groups 61. Adjacent X-shaped linkage groups 61 are hinged to each other and to the bottom of the retractable support rod 20 at the corresponding position. That is, the two ends of one set of X-shaped linkage groups 61 are respectively hinged to the first mounting seat 73 located at the top of the front wheel 71 and the bottom of the retractable support rod 20, and the two ends of the other set of X-shaped linkage groups 61 are respectively hinged to the second mounting seat 74 located at the top of the rear wheel 72 and the bottom of the retractable support rod 20.

[0062] As shown in Figure 5, the X-type linkage group 61 includes a central connecting part 611 located at the center and outer connecting rods 612 respectively hinged to the central connecting part 611. The connection points of the outer connecting rods 612 of adjacent X-type linkage groups 61 are provided with hinge members 62 and connecting rods 63. One end of the connecting rod 63 is connected to the hinge member 62, and the other end is slidably connected to the lower hinge point of the connecting rod of the side linkage assembly 30. Specifically, the connecting rod 63 is provided with a vertical groove 631. The connecting shaft 33 at the lower hinge point passes through the groove 631. When the frame 10 is unfolded, the connecting shaft 33 is located at the top of the groove 631; when the frame 10 is retracted, the connecting shaft 33 is located at the bottom of the groove 631. The function of the connecting rod 63 is to strengthen the connection between the middle of the folding chassis 60 and the side link assembly 30 when the frame 10 is unfolded. The force on the middle of the folding chassis 60 can be transmitted to the side link assembly 30 through the connecting rod 63, and then to the telescopic support rod 20, thereby improving the support force of the folding chassis 60 for the items in the storage space 11, making the folding chassis 60 more stable, and thus improving the overall stability of the frame 10.

[0063] As shown in Figures 6 and 7, Embodiment 2 differs from Embodiment 1 in that the rear link assembly 50 can be opened relative to the frame 10 to expand the accommodating space 11 of the frame 10. Therefore, in this embodiment, the top connecting portion 24 and the bottom connecting portion 23 on the telescopic support rod 20 connected to the front wheel 71 have the same structure as in Embodiment 1; however, since the rear link assembly 50 can be opened, it is detachably connected to the top connecting portion 24, and hinged to the bottom of the telescopic support rod 20. The top connecting portion 24 and the bottom connecting portion 23 on the telescopic support rod 20 connected to the rear wheel 72 are different.

[0064] Specifically, as shown in Figure 6, the structure of the bottom connecting part 23 on the retractable support rod 20 connected to the rear wheel 72 can be the same as in Embodiment 1, but the first connecting frame 233 on the bottom connecting part 23 is only hinged to the second side connecting rod 32 in the side connecting rod assembly 30, and is not connected to the rear connecting rod assembly 50.

[0065] As shown in Figures 6 and 7, the rear link assembly 50 also includes rear uprights 53 located on both sides of the cross-connected links. The ends of the links are hinged to the rear uprights 53. The upper part of the rear uprights 53 is detachably connected to the top connection parts 24 on the two telescopic support rods 20, and the lower part of the rear uprights 53 is hinged to the bottom of the two telescopic support rods 20.

[0066] The top connection portion 24 on the retractable support rod 20 connected to the rear wheel 72 includes a hinge groove 244 for hinged connection of the side link assembly 30 and a locking groove 245 for engaging with the upper part of the rear upright 53. The hinge groove 244 is hinged to the first side link 31 of the side link assembly 30. When the frame 10 is unfolded, the upper part of the rear link assembly 50 can be separated from the retractable support rod 20, so that the rear link assembly 50 flips downward relative to the retractable support rod 20.

[0067] To prevent the rear linkage assembly 50 from overturning and colliding with the ground, the rear linkage assembly 50 includes two connecting ropes 54. One end of the connecting rope 54 is connected to the rear column, and the other end is connected to the telescopic support rod 20, so that the rear linkage assembly 50 can basically maintain a horizontal position or other set angle.

[0068] The frame 10 of this folding trolley embodiment can be equipped with an inner liner adapted to the accommodating space 11. The inner liner can be detachably fixed to the top of the inner column 22. When the rear linkage assembly 50 of the frame 10 can be folded down, the corresponding position of the inner liner can also be folded down along with the rear linkage assembly 50. Of course, in some cases, an inner liner may not be provided, and the frame 10 can be used directly to accommodate items. The structure of the inner liner is diverse, and the inner liner structure in the prior art can be adopted, which will not be described in detail here.

[0069] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A folding handcart, comprising a frame, wheels, and a traction unit, wherein the wheels are located at the bottom of the frame, characterized in that, The vehicle frame includes Telescopic support rods are located at the four corners of the vehicle frame, and their bottoms are connected to the wheels at the corresponding positions. A foldable side link assembly is located on the side of the frame and is connected to two of the telescopic support rods respectively. A foldable front linkage assembly is located on the front side of the frame and is connected to the two telescopic support rods respectively; A foldable rear linkage assembly is located at the rear of the frame and is connected to the two telescopic support rods respectively. A folding chassis is located at the bottom of the vehicle frame and is connected to the retractable support rods at the four corners. The retractable support rod includes an outer tube, an inner column, a top connecting part, and a bottom connecting part. The inner column is slidably connected to the outer tube. The top connecting part is fixedly connected to the top end of the outer tube. The bottom connecting part is slidably sleeved on the outer tube. The outer tube is provided with a vertical groove. The bottom connecting part is connected to the inner column through the vertical groove. The link ends of at least one of the side link assembly, the front link assembly, and the rear link assembly are respectively hinged to the top connection portion and the bottom connection portion, so that the frame has When the corresponding linkage assembly unfolds, the bottom connecting part, under the action of the corresponding linkage, drives the inner column to rise in a first state; and When the corresponding link assembly is retracted, the bottom connecting part drives the inner column to descend in the second state under the action of the corresponding link.

2. The folding handcart according to claim 1, characterized in that, The bottom connecting part includes a first body and a connector for connecting with the inner column. The first body has a through hole so that the bottom connecting part can be slidably sleeved on the outer tube. The first body has a first connecting hole, and the connector passes through the first connecting hole and the vertical slot and is fixedly connected to the second connecting hole on the inner column; when the bottom connecting part moves along the outer tube, the connector moves in the vertical slot.

3. The folding handcart according to claim 2, characterized in that, The bottom connecting part further includes two first connecting frames forming a set angle, and the first connecting frames are connected to the first body; The first connecting bracket is used to hinge with a link in the side link assembly, the front link assembly, or the rear link assembly.

4. The folding handcart as described in claim 1, 2, or 3, characterized in that, The side link assembly includes a first side link hinged to the top connection portion and a second side link hinged to the bottom connection portion; and / or The front link assembly includes a first front link hinged to the top connection and a second front link hinged to the bottom connection.

5. The folding handcart as described in claim 1, 2, or 3, characterized in that, The side link assembly, the front link assembly, and the rear link assembly each include a plurality of links that are cross-connected, and the number of links in the side link assembly is greater than the number of links in the front link assembly and greater than the number of links in the rear link assembly. The height of the side link assembly, the front link assembly, and the rear link assembly after the frame is folded is no greater than the height of the retractable support rod.

6. The folding handcart as described in claim 4, characterized in that, The rear link assembly includes a first rear link hinged to the top connection and a second rear link hinged to the bottom connection.

7. The folding handcart as described in claim 4, characterized in that, The rear link assembly also includes rear uprights located on both sides of the cross-connected links, the end of the link... The end is hinged to the rear upright, the upper part of the rear upright is detachably connected to the top connecting parts of the two telescopic support rods, and the lower part of the rear upright is hinged to the bottom of the two telescopic support rods. The top connecting part includes a hinge groove for hinged connection of the side connecting rod assembly and a locking groove for engaging with the upper part of the rear upright. When the frame is deployed, the upper part of the rear link assembly can be separated from the telescopic support rod, allowing the rear link assembly to flip downward relative to the telescopic support rod.

8. The folding handcart as described in claim 7, characterized in that, The rear linkage assembly includes two connecting ropes, one end of which is connected to the rear upright and the other end of which is connected to the telescopic support rod.

9. The folding handcart as described in claim 4, characterized in that, The folding chassis includes at least two sets of X-shaped linkages, adjacent X-shaped linkages are hinged to each other, and are also hinged to the bottom of the retractable support rod at the corresponding position.

10. The folding handcart as described in claim 9, characterized in that, The connection between the two sets of X-shaped linkages is provided with a hinge and a connecting rod. One end of the connecting rod is connected to the hinge, and the other end is slidably connected to the lower hinge of the connecting rod of the side linkage assembly. The connecting rod is provided with a vertical groove, and the connecting shaft at the lower hinge passes through the groove. When the frame is unfolded, the connecting shaft is located at the top of the groove; when the frame is folded up, the connecting shaft is located at the bottom of the groove.

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