Foldable capacity expandable carry wagon

Abstract

To provide a foldable capacity-expanding carry wagon which has the same height before and after folding and can increase its length when unfolded without changing its width. [Solution] The front elevation frame 1 and the rear elevation frame 2 are each provided with a support column, and a slide sleeve 3 is attached to the support column. The side folding structure 4 includes a plurality of X-shaped crossbars hinged in sequence. The bottom support 5 includes a front bottom frame, a rear bottom frame, and a limiting part, and the front bottom frame and the rear bottom frame are hingedly connected, and the limiting part supports the front bottom frame and the rear bottom frame and limits their positions. The capacity expansion structure 6 includes an expansion frame and a connecting rod mechanism, and the expansion frame is hingedly connected to two rear pillars 21, and the slide sleeve of the rear pillar drives and rotates the expansion frame by the connecting rod mechanism, forming an interlocking overall folding structure.

Description

[Technical field]

[0001] This utility model belongs to the technical field of carrying wagons, and in particular to a foldable, expandable carrying wagon. [Background technology]

[0002] Carry wagons are often used to transport luggage and goods during outdoor activities and camping. These carry wagons are widely used because they are easy to push and pull, saving time and effort. In order to make the carry wagons easier to store, many outdoor carry wagons are designed to be foldable. In addition, in order to avoid increasing the volume of the carry wagon after folding, current carry wagon products are usually required to maintain the same height before and after folding.

[0003] However, there remains a high demand from users for large-capacity carry wagons, so the challenge to be solved in this technical field is how to optimize the folding structure, increase capacity, and make the folding process smoother and easier to use without changing the height before and after folding. Summary of the Invention

[0004] The present invention aims to solve at least one of the existing technical problems. To this end, the present invention provides a foldable capacity-expanding carrying wagon.

[0005] As a technical means of this utility model, a foldable capacity expandable carrying wagon is provided, which has the following features:

[0006] There are a front elevation frame and a rear elevation frame, and each of the front elevation frame and rear elevation frame has two pillars spaced apart on the left and right, and the four pillars are arranged in a rectangular shape, and each pillar has a slide sleeve that can slide up and down. The pillars on the front elevation frame are called the front pillars, and the pillars on the rear elevation frame are called the rear pillars.

[0007] There is a side folding structure, which is connected between the front and rear columns on the same side and consists of multiple X-shaped crossbars hinged in the front-to-rear direction in sequence, with one end of the first and last crossbar hinged to the adjacent column and the other end hinged to a sliding sleeve on that column.

[0008] There is a bottom support, the support includes a front bottom frame, a rear bottom frame, and a limiting component, the front bottom frame is hinged to the bottom of the front elevation frame, the rear bottom frame is hinged to the bottom of the rear elevation frame, and the front bottom frame and the rear bottom frame are also hinged to each other. The limiting component plays a role of supporting the front bottom frame and the rear bottom frame and limiting their positions when they are deployed downward.

[0009] The capacity expansion structure includes an expansion frame and a connecting rod mechanism, the expansion frame is an open ring frame that opens forward, and both left and right ends of the expansion frame are hingedly connected to two rear columns, respectively. The connecting rod mechanism is connected to the expansion frame and a sliding sleeve on the rear column, respectively, so that when the sliding sleeve slides up and down, the connecting rod mechanism pushes and pulls the expansion frame synchronously, so that it is expanded upward or folded downward.

[0010] Preferably, the connecting rod mechanism includes a first support rod, a second support rod, and a third support rod, one end of the first support rod is hinged to a sliding sleeve on the rear support column, the other end is hinged to a lower end of the second support rod toward the rear, the upper end of the second support rod is hinged to the extension frame, the lower end of the third support rod is hinged to a lower end of the rear support column, and the upper end is hinged to the first support rod.

[0011] Preferably, a stopper is provided on the second support rod for positioning the extension frame when the extension frame is folded downward.

[0012] Preferably, the limiting part is a U-shaped suspension rod, the front bottom frame is hinged to the bottom of the front elevation frame, the rear bottom frame is hinged to the bottom of the rear elevation frame, the front bottom frame and the rear bottom frame are hinged to each other and rest on the U-shaped suspension rod that opens upward. The left and right ends of the U-shaped suspension rod are hinged to the adjacent X-shaped crossbars, respectively.

[0013] Preferably, the left and right ends of the U-shaped suspension rod are connected to the hinge centers of the X-shaped crossbars located directly above.

[0014] Preferably, the limiting part includes a front hinge seat and a rear hinge seat, the front hinge seat is provided at the rear end of the front bottom frame, the rear hinge seat is provided at the front end of the rear bottom frame, the bottoms of the front hinge seat and the rear hinge seat are respectively provided with connecting protrusions, and the two protrusions are hingedly connected.

[0015] When the front bottom frame and the rear bottom frame are deployed downward and flattened, the rear end of the front hinge seat and the front end of the rear hinge seat come into contact with each other to limit their positions.

[0016] Preferably, the front and rear bottom frames are provided with a plurality of load-bearing bars, which cross each other vertically and horizontally to form a lattice-shaped frame.

[0017] Preferably, the front elevation frame is provided with a handle that can be extended and retracted in the vertical direction, and the bottom of the handle is hinged to the front elevation frame. The front elevation frame is provided with a holder that opens to the front side, and the handle fits into the holder.

[0018] Preferably, a horizontal stopper bar is connected to the upper part of the two front supports, and when the handle is fitted into the holder, the stopper bar abuts against and receives the rear of the handle.

[0019] Preferably, the front elevation frame and the rear elevation frame are each provided with wheels at their bottoms.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The side folding structure, bottom mounting base, and capacity expansion structure of this carrier wagon are all foldable, but the three parts do not fold independently, but are interconnected. The entire carrier wagon has an interconnected structure, and the significance of this structure is that when one part moves, the other parts move accordingly, making the folding and unfolding process of the entire carrier wagon very smooth and facilitating user use.

[0021] 2. During the folding process of this carrier wagon, the front and rear vertical frames and the front and rear support columns are not folded, but only move closer to each other toward the center. Therefore, if the dimensions of the side folding structure, bottom mounting base, and capacity expansion structure parts are designed in advance, the height of the carrier wagon will not exceed the height of the support columns when folded, and the height of the carrier wagon can be kept constant before and after folding. This makes it easier to store the carrier wagon.

[0022] 3. This trolley has a capacity expansion structure mainly on the rear elevation frame, which allows the length of the trolley to be increased when unfolded without changing the width of the trolley, effectively improving the capacity of the trolley and meeting the needs of users who require large capacity.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. [Brief description of the drawings]

[0024] In order to more clearly describe the technical solutions in the present utility model or the prior art, the following description will be made with reference to the drawings in a clear and understandable manner. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those skilled in the art can further obtain other drawings according to these drawings without creative ingenuity. [Figure 1] FIG. 1 is a front perspective view of a first embodiment of the present invention. [Diagram 2] FIG. 2 is a right side view of the wagon according to the first embodiment of the present invention after the wagon bottom liner has been attached. [Diagram 3] FIG. 3 is a rear perspective view of the first embodiment of the present invention. [Figure 4] FIG. 4 is an overhead view of the first embodiment of the present invention. [Diagram 5] FIG. 5 is a front view of the first embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram showing the deployed state of the first embodiment of the present invention. [Figure 7] FIG. 7 is a schematic diagram showing the semi-folded state of the first embodiment of the present invention. [Figure 8] FIG. 8 is a schematic diagram showing the completely folded state of the first embodiment of the present invention. [Figure 9] FIG. 9 is a front view of the second embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram showing the folding process of the second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The technical means in the embodiments of the present utility model will be described below clearly and completely with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative ingenuity belong to the protection scope of the present utility model.

[0026] The following is a detailed description of the embodiments of the present invention. The examples of the embodiments are shown in the drawings, and the same or similar numbers indicate the same or similar elements or elements having the same or similar functions. In the description of the embodiments of the present invention, the orientations or positional relationships of the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "longitudinal", "circumferential", "radial", "axial" and the like are based on the orientations or positional relationships shown in the drawings, and are merely for facilitating the description of the present invention and simplifying the description, and do not imply that the device or part has a specific orientation or needs to be arranged or operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of this utility model, a "first feature" or a "second feature" may include one or more of the features. In addition, the terms "first" and "second" are used for descriptive purposes only and do not imply any relative importance or quantity of the indicated technical features. Thus, a "first" or "second" feature may include one or more of the features, whether stated or implied.

[0028] In describing the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "attached", "connected", "coupled" and "fixed" should be understood in a broad sense. For example, they may be fixedly connected or detachably connected. They may be mechanically connected or electrically connected. They may be directly connected or indirectly connected via an intermediate medium or an internal connection between two parts. Those of ordinary skill in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0029] In this utility model, when parts A and B are "hinge connected", they may be connected by providing pivot holes in A and B, respectively, and passing pins through them. This is a simple and easy-to-implement connection method.

[0030] Example 1 As shown in FIGS. 1 to 5, the foldable capacity-expanding carry wagon includes a front elevation frame 1, a rear elevation frame 2, a side folding structure 4, a bottom mounting base 5, and a capacity-expanding structure 6.

[0031] As shown in Figures 1 and 2, the front elevation frame 1 and the rear elevation frame 2 each have two pillars spaced apart on the left and right, and the four pillars are arranged in a rectangular shape, with each pillar provided with a slide sleeve 3 that can slide up and down. The pillar on the front elevation frame 1 is called the front pillar 11, and the pillar on the rear elevation frame 2 is called the rear pillar 21.

[0032] Specifically, this carrier wagon has four vertical columns that form the framework that supports the carrier wagon. These columns are arranged at the four vertices of a rectangle, so that when the carrier wagon is unfolded, its overall shape becomes a rectangle.

[0033] Furthermore, as shown in FIG. 1, wheels 10 are provided at the bottom of the front elevation frame 1 and the rear elevation frame 2, respectively, and the wheels 10 of the front elevation frame 1 are omnidirectional wheels 101, while the wheels 10 of the rear elevation frame 2 are fixed wheels 102.

[0034] As shown in Figures 1 and 5, the front elevation frame 1 is provided with a handle 8 that can be extended and retracted vertically, which makes it convenient for the user to pull and move the carry wagon. The handle 8 is a multi-stage telescopic handle 8, which is widely used in existing technology, such as suitcase handles, and can be selected as needed.

[0035] The bottom of the handle 8 is hinged to the front elevation frame 1, which is provided with a holder 12 that opens to the front. When the carry wagon is not being pulled, the handle 8 is fitted into the holder 12 to secure it in place. When pulling the carry wagon, the handle 8 is pulled forward from the holder 12, and the handle 8 can be removed from the holder 12 and the carry wagon can be pulled. A horizontal stopper bar 9 is connected to the top of the two front pillars 11, and when the handle 8 is fitted into the holder 12, the stopper bar 9 receives the handle from behind and serves to limit the position of the handle.

[0036] As shown in Figures 1 and 2, a side folding structure 4 is provided on each of the left and right sides of the carry wagon, and is mainly used to realize the folding of the carry wagon in the front-rear direction. The side folding structure 4 is connected between the front support 11 and the rear support 21 on the same side of the wagon, and the side folding structure 4 is composed of a number of X-shaped crossbars 41 hinged in the front-rear direction. Of the upper and lower ends of the first and last crossbars 41, one end is hinged to the adjacent support, and the other end is hinged to the sliding sleeve 3 on that support.

[0037] 1 to 5, for example, the lower end of the frontmost X-shaped crossbar part 41 of the folding structure 4 on the same side is hinged to the lower end of the front support pillar 11, and the upper end is hinged to the sliding sleeve 3 of the front support pillar 11. The lower end of the rearmost X-shaped crossbar part 41 is hinged to the lower end of the rear support pillar 21, and the upper end is hinged to the sliding sleeve 3 of the rear support pillar 21.

[0038] The X-shaped crossbar 41 here refers to a part in which two bars cross and are hinged. In this technical solution, there is no limit to the number of X-shaped crossbars 41 in the side folding structure 4, and those skilled in the art can increase or decrease the number of X-shaped crossbars 41 as needed to adjust the length of the carrier wagon after it is unfolded.

[0039] As shown in Figures 2, 3 and 4, the bottom support includes a front bottom frame 51, a rear bottom frame 52 and a limiting component. The front bottom frame 51 is hinged to the bottom of the front elevation frame 1, the rear bottom frame 52 is hinged to the bottom of the rear elevation frame 2, and the front bottom frame 51 and the rear bottom frame 52 are hinged to each other.

[0040] The limiting parts support the front bottom frame 51 and the rear bottom frame 52 when the front bottom frame 51 and the rear bottom frame 52 are deployed downward, and limit their positions. In this case, the front bottom frame 51 and the rear bottom frame 52 cannot move downward any further, and can play a role of carrying objects.

[0041] In the first embodiment, the limiting part is composed of a U-shaped suspension rod 53, the front bottom frame 51 is hinged to the bottom of the front elevation frame 1, the rear bottom frame 52 is hinged to the bottom of the rear elevation frame 2, and the front bottom frame 51 and the rear bottom frame 52 are hinged and rest on the U-shaped suspension rod that opens upward. The left and right ends of the U-shaped suspension rod 53 are hinged to the adjacent X-shaped crossbars, respectively.

[0042] That is, the method of connecting the U-shaped suspension rod 53 and the X-shaped crossbar 41 is to connect the parts close to each other upward. The left end of the U-shaped suspension rod 53 is hinged to the X-shaped crossbar 41 close to the U-shaped suspension rod 53 in the left side folding structure 4. Also, the right end of the U-shaped suspension rod 53 is hinged to the X-shaped crossbar 41 close to the U-shaped suspension rod 53 in the right side folding structure 4. To facilitate installation, both the left and right ends of the U-shaped suspension rod 53 are connected to the hinge centers of the X-shaped crossbar 41 located directly above.

[0043] Specifically, the installed U-shaped hanging rod 53 is mainly used to pull the front bottom frame 51 and the rear bottom frame 52 together, so that the front bottom frame 51 and the rear bottom frame 52 can play the role of carrying objects when the carrier wagon is unfolded and used. Furthermore, the front bottom frame 51 and the rear bottom frame 52 are only supported on the U-shaped hanging rod 53, and when the front bottom frame 51 and the rear bottom frame 52 rotate upward to be folded, they can be separated from the U-shaped hanging rod 53, and the U-shaped hanging rod 53 and the upper X-shaped crossbar 41 are hinged, so that the U-shaped hanging rod 53 does not affect the folding of the front bottom frame 51 and the rear bottom frame 52 and the folding of the X-shaped crossbar 41.

[0044] In order to ensure that the front bottom frame 51 and the rear bottom frame 52 have good load-bearing capacity, as shown in Figures 1 and 4, the front bottom frame 51 and the rear bottom frame 52 are each provided with a plurality of load-bearing bars 54. Specifically, the load-bearing bars 54 are composed of horizontal bars and vertical bars, and the horizontal bars and the vertical bars are crossed and connected, so that the front bottom frame 51 and the rear bottom frame 52 form a lattice-like frame structure, thereby improving the load-bearing capacity.

[0045] 2 and 3, the capacity expansion structure 6 includes an expansion frame 61 and a connecting rod mechanism, the expansion frame 61 is an open ring frame that opens forward, and both left and right ends of the expansion frame 61 are hingedly connected to the two rear columns 21. The connecting rod mechanism is connected to the expansion frame 61 and the sliding sleeves 3 on the rear columns 21, respectively.

[0046] Specifically, a fixing sleeve 7 is installed on the top of the rear support 21, and the extension frame 61 is hinged to the fixing sleeve 7. Each rear support 21 is connected to a connecting rod mechanism, which includes a first support rod 62, a second support rod 63, and a third support rod 64. One end of the first support rod 62 is hinged to the slide sleeve 3 on the rear support 21, and the other end is hinged to the lower end of the second support rod 63 toward the rear. The upper end of the second support rod 63 is hinged to the extension frame 61, the lower end of the third support rod 64 is hinged to the lower end of the rear support 21, and the upper end is hinged to the first support rod 62. With this structure, the slide sleeve 3 on the rear support 21 slides up and down, and the extension frame 61 is pushed and pulled synchronously through the connecting rod mechanism to be deployed upward or folded downward.

[0047] The installed capacity expansion structure 6 mainly adds a foldable expansion frame 61 to the rear of the carrier wagon, which allows the carrier wagon to increase its unfolded length without changing its width when it is unfolded for use, effectively improving the capacity of the carrier wagon and meeting the large-capacity needs of users. As shown in Figure 2, after the capacity expansion structure 6 is installed, a large-capacity removable cart bag can be attached to the carrier wagon, making it convenient for carrying things.

[0048] The folding procedure for this carry wagon is as follows: Step 1: When it is desired to change the carry wagon from the unfolded state to the folded state as shown in Fig. 6, first the front bottom frame 51 and the rear bottom frame 52 of the bottom support stand 5 are folded upward and lifted as shown in Fig. 7. Since the front bottom frame 51 is hinged to the bottom of the front elevation frame 1, and the rear bottom frame 52 is hinged to the bottom of the rear elevation frame 2, when the front bottom frame 51 and the rear bottom frame 52 are folded upward and lifted, the front elevation frame 1 and the rear elevation frame 2 are pulled toward the center.

[0049] Step 2: Because the columns of the front and rear elevation frames are connected by the side folding structure 4, when the front elevation frame 1 and the rear elevation frame 2 are pulled toward the center, the front columns 11 and the rear columns 21 are also pulled toward the center, thereby folding the side folding structure 4. The X-shaped crossbars 41 in the side folding structure 4 perform a folding motion in sequence, causing the sliding sleeves 3 on the front columns 11 and the rear columns 21 to slide upward.

[0050] Step 3: When the sliding sleeve 3 on the rear support 21 slides upward, the first support rod 62 moves in conjunction with it, and the second support rod 63 and the third support rod 64 move closer to the rear support 21 to perform a folding motion, so that the extension frame 61 rotates downward and folds, and finally the folded state shown in FIG. 8 is formed.

[0051] Furthermore, in order to enable the extension frame 61 to be smoothly pulled up and the carry wagon to be unfolded, as shown in FIG. 3, a stopper 65 is provided on the second support rod 63, which restricts the extension frame 61 when it is folded downward, thereby preventing excessive folding.

[0052] From the above, the structure of this carry wagon has the following features: 1. The side folding structure 4, bottom mounting base 5, and capacity expansion structure 6 of this carrier wagon are all foldable, but the three parts do not fold independently, but are interconnected. The entire carrier wagon has an interconnected structure, and the significance of this structure is that when one part moves, the other parts move accordingly, making the folding and unfolding process of the entire carrier wagon very smooth and facilitating use by users.

[0053] 2. In the folding process of this carrier wagon, the front and rear vertical frames and the front and rear support columns 21 are not folded, but simply move closer to each other toward the center. Therefore, if the dimensions of the parts of the side folding structure 4, the bottom mounting base 5, and the capacity expansion structure 6 are designed in advance, the height of the carrier wagon can be prevented from exceeding the height of the support columns when folded, and the height of the carrier wagon can be kept constant before and after folding. This makes it easy to store the carrier wagon.

[0054] 3. This carrier wagon is mainly provided with a capacity expansion structure 6 on the rear elevation frame 2, which allows the length of the carrier wagon to be increased when unfolded without changing the width of the carrier wagon. This effectively improves the capacity of the carrier wagon and meets the needs of users who require large capacity.

[0055] Example 2 9 and 10, in the second embodiment, a U-shaped hanging rod is not used as the limiting part, but a different structure is adopted. The limiting part includes a front hinge seat 55 and a rear hinge seat 56, the front hinge seat 55 is provided at the rear end of the front bottom frame 51, the rear hinge seat 56 is provided at the front end of the rear bottom frame 52, and the front hinge seat 55 and the rear hinge seat 56 are provided at their bottoms with connecting protrusions 57, respectively, and the two protrusions 57 are hinged.

[0056] As shown in Fig. 9, when the front bottom frame 51 and the rear bottom frame 52 are unfolded downward and flattened, the rear end of the front hinge seat 55 and the front end of the rear hinge seat 56 come into contact with each other to restrict the position, and at this point, the front bottom frame 51 and the rear bottom frame 52 can be restricted from further rotating downward, so that they can serve as a carrying device. This restricting structure is simpler and more convenient. As shown in Fig. 10, the folding method of the second embodiment is the same as that of the first embodiment, and a detailed description is omitted.

[0057] Although some embodiments of the present invention have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention and are protected within the scope of the claims of the present invention. [Explanation of symbols]

[0058] 1.Front elevation frame; 11.Front support; 12.Holder; 2. Rear elevation frame;21. Rear support; 3.Sliding sleeve; 4.Side folding structure;41.X-shaped crossbar; 5. Bottom support base; 51. Front bottom frame; 52. Rear bottom frame; 53, U-shaped hanging rod; 54, load-bearing rod; 55, front hinge seat; 56, rear hinge seat; 57, connecting protrusion; 6, capacity expansion structure; 61, expansion frame; 62, first support rod; 63, second support rod; 64, third support rod; 65, stopper; 7. Fixing sleeve; 8.Handle; 9. Stopper bar 10, wheels; 101, omnidirectional wheels; 102, fixed wheels;

Claims

1. A folding capacity expansion carrying wagon including a front elevation frame, a rear elevation frame, a side folding structure, a bottom mounting base, and a capacity expansion structure, The front elevation frame and the rear elevation frame each have two pillars arranged at a distance from each other on the left and right, the four pillars are arranged in a rectangular shape, and each pillar has a slide sleeve that can slide up and down. The pillars on the front elevation frame are called front pillars, and the pillars on the rear elevation frame are called rear pillars. The side folding structure is connected between the front and rear columns on the same side, and is composed of a plurality of X-shaped crossbars hinged in the front-rear direction, one end of the first and last crossbars is hinged to the adjacent column, and the other end is hinged to a sliding sleeve on the column; The bottom support includes a front bottom frame, a rear bottom frame, and a limiting part, the front bottom frame is hinged to the bottom of the front elevation frame, and the rear bottom frame is hinged to the bottom of the rear elevation frame, and the front bottom frame and the rear bottom frame are also hinged to each other, and the limiting part serves to support the front bottom frame and the rear bottom frame and limit their positions when they are deployed downwards; The capacity expansion structure of the foldable capacity-expanding carrier wagon includes an expansion frame and a connecting rod mechanism, the expansion frame being an open ring frame that opens forward, with both left and right ends hingedly connected to the two rear columns, and the connecting rod mechanism is connected to the expansion frame and a sliding sleeve on the rear column, respectively, so that when the sliding sleeve slides up and down, the connecting rod mechanism pushes and pulls the expansion frame in synchronous fashion, thereby expanding it upward or folding it downward.

2. 2. The folding capacity expandable carrying wagon according to claim 1, wherein the connecting rod mechanism includes a first support rod, a second support rod and a third support rod, one end of the first support rod is hingedly connected to a sliding sleeve on the rear support column and the other end is hingedly connected to a lower end of the second support rod toward the rear, an upper end of the second support rod is hingedly connected to the expansion frame, a lower end of the third support rod is hingedly connected to a lower end of the rear support column and an upper end is hingedly connected to the first support rod.

3. 3. The folding type capacity expandable carrying wagon according to claim 2, characterized in that a stopper is provided on the second support rod for positioning the expansion frame when the expansion frame is folded downward.

4. The foldable capacity expandable carrying wagon of claim 1, characterized in that the limiting part is composed of a U-shaped hanging rod, the front bottom frame is hingedly connected to the bottom of the front elevation frame, the rear bottom frame is hingedly connected to the bottom of the rear elevation frame, the front bottom frame and the rear bottom frame are hingedly connected to the bottom of the rear elevation frame, and the front bottom frame and the rear bottom frame are abutted on the U-shaped hanging rod that opens upward, and the left and right ends of the U-shaped hanging rod are hingedly connected to the adjacent X-shaped crossbars, respectively.

5. The foldable, expandable carrying wagon according to claim 4, characterized in that the left and right ends of the U-shaped suspension rod are connected to the hinge centers of the X-shaped crossbars located directly above.

6. The limiting part includes a front hinge seat and a rear hinge seat, the front end of the front bottom frame is provided with a front hinge seat, the front end of the rear bottom frame is provided with a rear hinge seat, the bottoms of the front hinge seat and the rear hinge seat are respectively provided with connecting protrusions, and the two protrusions are hingedly connected; The foldable capacity-expandable carrier wagon according to claim 1, wherein when the front bottom frame and the rear bottom frame are unfolded downward and flattened, the rear end of the front hinge seat and the front end of the rear hinge seat come into contact with each other to limit their positions.

7. The folding type capacity expandable carrying wagon according to claim 1, characterized in that the front bottom frame and the rear bottom frame are provided with a number of load-bearing bars.

8. The foldable, expandable carrying wagon according to claim 7, characterized in that the front and rear bottom frames are provided with a plurality of load-bearing bars, which cross vertically and horizontally to form a lattice-shaped frame.

9. The foldable capacity expandable carrying wagon of claim 1, characterized in that the front elevation frame is provided with a handle that is extendable and retractable in the vertical direction, the bottom of the handle is hingedly connected to the front elevation frame, and the front elevation frame is provided with a holder that opens to the front side, and the handle fits vertically into the holder.

10. The foldable, expandable carrying wagon according to claim 9, characterized in that a horizontal stopper bar is connected to the upper part of the two front supports, and when the handle is fitted into the holder, the stopper bar abuts against and receives the rear of the handle.

11. 2. The folding and expandable carrying wagon according to claim 1, wherein the bottoms of the front and rear elevation frames are provided with wheels.

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