Portable folding cart

Abstract

The utility model relates to the technical field of carts, in particular to a portable folding cart which comprises a push-pull mechanism, a folding mechanism and a bearing mechanism, the push-pull mechanism comprises a holding piece and a push rod assembly which are connected with each other, and the folding mechanism comprises a first handle frame, a rotating piece and a first driven rod. The first handle frame, the rotating part, the first driven rod and the push rod assembly jointly form a four-rod mechanism, a positioning hole is formed in the first driven rod and is close to the push rod assembly, the bearing mechanism comprises a supporting rod and a second driven rod which are rotationally connected, the supporting rod is rotationally connected with the push rod assembly, and a rear wheel is connected to the supporting rod. A strip-shaped hole is formed in the second driven rod; a rotating shaft is further included, the rotating shaft penetrates through the strip-shaped hole and extends into the positioning hole, and a front wheel is connected to the rotating shaft; when the first handle frame is unfolded to a limit angle and the supporting rod is unfolded to a limit angle, the rotating shaft is located at the end, close to the push rod assembly, of the strip-shaped hole. The problem that a traditional cart is not convenient enough to use is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of trolleys, in particular to a portable folding trolley. Background Art

[0002] In modern life, in order to facilitate the carrying of heavy objects or various sundries, trolleys are often used when moving or shopping. Users only need to place the items on the load-carrying rack of the trolley and fix them, and then they can push or pull the trolley to walk, which greatly reduces the burden on the users.

[0003] Currently, the trolleys on the market usually have a folding function, and the assembly and folding of the trolley are realized by using a locking mechanism or a gear assembly provided on the vehicle body. Users need to unfold the trolley and then fasten and snap the locking piece in place before they can use the trolley. The structure is complex, the time required for unfolding is long and the steps are numerous, which is likely to affect others in crowded spaces or places with a large flow of people, making the traditional trolley inconvenient to use. Content of the Utility Model

[0004] To solve the above problems, the utility model provides a portable folding trolley, which solves the problem that the traditional trolley is inconvenient to use.

[0005] The technical solution adopted by the utility model is as follows: a portable folding trolley, comprising a pushing and pulling mechanism, a folding mechanism and a load-bearing mechanism. The pushing and pulling mechanism includes a holding member and a push rod assembly connected to each other. The folding mechanism includes a first handle frame, a rotating member and a first driven rod. The first handle frame is rotatably connected to the push rod assembly. The rotating member is rotatably connected to the first handle frame. One end of the first driven rod is rotatably connected to the push rod assembly, and the other end of the first driven rod is rotatably connected to the rotating member. The first handle frame, the rotating member, the first driven rod and the push rod assembly together form a four-bar mechanism. A positioning hole is formed in the first driven rod, and the positioning hole is close to the push rod assembly. The load-bearing mechanism includes a support rod and a second driven rod. The support rod is rotatably connected to the push rod assembly. A rear wheel is connected to the support rod. The second driven rod is rotatably connected to the support rod, and a strip-shaped hole is formed in the second driven rod. A rotating shaft is further included. The rotating shaft passes through the strip-shaped hole and extends into the positioning hole, and a front wheel is connected to the rotating shaft. When the first handle frame is unfolded to the limit angle and the support rod is unfolded to the limit angle, the rotating shaft is located at one end of the strip-shaped hole close to the push rod assembly.

[0006] Through the above technical solution, the user drives the first handle frame to rotate and unfold it on the push rod assembly, so that the rotating member and the first driven rod rotate synchronously, and the driving shaft drives the second driven rod to move, so that the support rod rotates on the push rod assembly until the first handle frame is unfolded to the extreme angle. The support rod is unfolded to the extreme angle, so that the cart is fully unfolded, and the user can use the cart to carry heavy objects; the user only needs to pull the first handle frame to rotate to unfold the cart, and the daily use of the cart can be realized without complicated components, and it is very convenient to use.

[0007] Furthermore, the strip-shaped hole is arc-shaped, and a middle portion of the strip-shaped hole protrudes toward one side of the folding mechanism.

[0008] Through the above technical solution, the arc-shaped strip hole with the middle part protruding toward one side of the folding mechanism allows the second driven rod to move downward when it is rotated under force, which greatly reduces the volume of the load-bearing mechanism after folding, making the overall structure of the cart more compact after folding.

[0009] Furthermore, the positioning hole is in a strip shape, and the positioning hole includes an arc segment and a clamping segment, and the clamping segment is closer to the rotation connection between the support rod and the second driven rod than the arc segment.

[0010] Through the above technical solution, when the first handle frame is unfolded and rotated to the extreme angle so that the rotating shaft is located in the clamping section, the positions of the rotating shaft and the first driven rod and the second driven rod are fixed, and the user can use the cart to carry loads; the first handle frame is stored so that the rotating shaft disengages from the clamping section, and the rotating shaft moves in the arc section, and the folding mechanism and the load-bearing mechanism can be folded, so that the cart can be stored, making the unfolding and storage of the cart very simple and convenient.

[0011] Furthermore, a first limiting groove is provided on the rotating member; when the first handle frame is unfolded to a limit angle, the first limiting groove and the first handle frame are engaged with each other.

[0012] Through the above technical solution, after the user unfolds and rotates the first handle frame to the extreme angle, the first limit groove on the rotating member is snapped onto the first handle frame, so that the relative position of the rotating member and the first handle frame is fixed, the overall structure is very stable, and it is more convenient to use.

[0013] Furthermore, the push rod assembly includes a push rod and a connecting sleeve, the push rod and the connecting sleeve are plugged together, the support rod and the push rod are rotatably connected, and the first handle frame and the first driven rod are rotatably connected to the connecting sleeve respectively.

[0014] Through the above technical solution, the support rod and the push rod are rotatably connected, and the first handle frame and the first driven rod are respectively rotatably connected to the connecting sleeve, so that the assembly of the folding mechanism and the load-bearing mechanism with the push rod assembly is very convenient and more convenient to use.

[0015] Further, an extension portion is provided on the support rod, and a second limiting groove is provided at the end of the extension portion; when the support rod is unfolded to the limit angle, the second limiting groove is clamped with the push rod.

[0016] Through the above technical solution, after the user unfolds and rotates the support rod to the limit angle, the second limiting groove on the support rod is clamped onto the push rod, so that the relative positions of the support rod and the push rod are fixed, making the overall structure of the load-bearing mechanism and the push rod assembly very stable and more convenient to use.

[0017] Further, a second handle frame is further included, and the second handle frame is connected to the rotating member.

[0018] Through the above technical solution, the user can use the second handle frame to share the weight of the cart to maintain balance, greatly improving the load capacity of the cart and making it more convenient to use.

[0019] Further, the shapes of the first handle frame and the second handle frame are both in a "U" shape.

[0020] Through the above technical solution, the "U"-shaped first handle frame and second handle frame provide a place for the user to hold, making it easier to exert force, and the "U" shape design makes the stress structures of the first handle frame and the second handle frame better, capable of withstanding greater tensile force.

[0021] Further, gaskets are provided between the end of the second driven rod and the first driven rod and between the end of the second driven rod and the front wheel. The rotating shaft passes through the gaskets, and the gaskets are attached to the side wall of the second driven rod.

[0022] Through the above technical solution, the setting of the gaskets effectively fills the gaps between the end of the second driven rod and the first driven rod and the front wheel, making the second driven rod more stable during rotation, and avoiding situations such as jamming caused by the shaking and deviation of the second driven rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0024] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0025] Figure 2 is one of the schematic diagrams of the partial structure of the present utility model;

[0026] Figure 3 is the second of the schematic diagrams of the partial structure of the present utility model;

[0027] Figure 4 is a schematic diagram of the folding mechanism structure of the present utility model;

[0028] Figure 5 is a schematic diagram of the load-bearing mechanism structure of the present utility model;

[0029] Figure 6 is a schematic diagram of the rotating part structure of the present utility model;

[0030] Figure 7 is a schematic diagram of the gasket structure of the present utility model;

[0031] The label information of the utility model is as follows:

[0032] 1. Push-pull mechanism; 2. Folding mechanism; 3. Load-bearing mechanism; 4. Holding part; 5. Push rod assembly; 6. First handle frame; 7. Rotating part; 8. First driven rod; 9. Positioning hole; 10. Support rod; 11. Second driven rod; 12. Rear wheel; 13. Strip-shaped hole; 14. Rotating shaft; 15. Front wheel; 16. Arc section; 17. Clamping section; 18. First limiting groove; 19. Push rod; 20. Connecting sleeve; 21. Extension part; 22. Second limiting groove; 23. Second handle frame; 24. Gasket;

[0033] The realization of the purpose, functional characteristics and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific Embodiments

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0035] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0037] Refer to Figures 1 to 7 As shown, a portable folding cart includes a pushing and pulling mechanism 1, a folding mechanism 2, and a load-bearing mechanism 3. The pushing and pulling mechanism 1 includes a holding member 4 and a push rod assembly 5 that are connected to each other. The folding mechanism 2 includes a first handle frame 6, a rotating member 7, and a first driven rod 8. The first handle frame 6 is rotatably connected to the push rod assembly 5. The rotating member 7 is rotatably connected to the first handle frame 6. One end of the first driven rod 8 is rotatably connected to the push rod assembly 5, and the other end of the first driven rod 8 is rotatably connected to the rotating member 7. The first handle frame 6, the rotating member 7, the first driven rod 8, and the push rod assembly 5 together form a four-bar mechanism. A positioning hole 9 is provided on the first driven rod 8, and the positioning hole 9 is close to the push rod assembly 5. The load-bearing mechanism 3 includes a support rod 10 and a second driven rod 11. The support rod 10 is rotatably connected to the push rod assembly 5. A rear wheel 12 is connected to the support rod 10. The second driven rod 11 is rotatably connected to the support rod 10. A strip-shaped hole 13 is provided on the second driven rod 11; a rotating shaft 14 is further included. The rotating shaft 14 passes through the strip-shaped hole 13 and extends into the positioning hole 9, and a front wheel 15 is connected to the rotating shaft 14; when the first handle frame 6 is unfolded to the limit angle and the support rod 10 is unfolded to the limit angle, the rotating shaft 14 is located at one end of the strip-shaped hole 13 close to the push rod assembly 5. The user drives the first handle frame 6 to rotate and unfold on the push rod assembly 5, so that the rotating member 7 and the first driven rod 8 rotate synchronously, driving the rotating shaft 14 to drive the second driven rod 11 to move, so that the support rod 10 rotates on the push rod assembly 5 until the first handle frame 6 is unfolded to the limit angle and the support rod 10 is unfolded to the limit angle, so that the cart is completely unfolded, and the user can use the cart to carry heavy objects; the user only needs to pull the first handle frame 6 to rotate to unfold the cart, and the daily use of the cart can be realized without complex components, and it is very convenient to use.

[0038] Preferably, the number of the rotating members 7 is two.

[0039] Preferably, the number of both the first driven rod 8 and the second driven rod 11 is two.

[0040] Preferably, the number of both the front wheels 15 and the rear wheels 12 is two.

[0041] Refer to Figure 1 and 2 As shown in FIGS. 5, the strip-shaped hole 13 is arc-shaped, and the middle part of the strip-shaped hole 13 protrudes toward one side of the folding mechanism 2. The arc-shaped strip-shaped hole 13 with the middle part protruding toward one side of the folding mechanism 2 enables the second driven rod 11 to move downward when being stressed and rotated, greatly reducing the volume of the load-bearing mechanism 3 after folding and making the overall structure of the trolley more compact after folding.

[0042] Preferably, the number of the strip-shaped holes 13 is two.

[0043] Refer to Figure 1 and 2 As shown in FIGS. 4, the positioning hole 9 is strip-shaped and includes an arc segment 16 and a clamping segment 17. The clamping segment 17 is closer to the rotation connection of the support rod 10 and the second driven rod 11 than the arc segment 16. When the first handle frame 6 is unfolded and rotated to the limit angle so that the rotation shaft 14 is located at the clamping segment 17, the positions of the rotation shaft 14, the first driven rod 8 and the second driven rod 11 are fixed, and the user can use the trolley to carry a load; when the first handle frame 6 is retracted so that the rotation shaft 14 disengages from the clamping segment 17 and the rotation shaft 14 moves within the arc segment 16, the folding mechanism 2 and the load-bearing mechanism 3 can be folded, so that the trolley can be retracted and stored, making the unfolding and retraction of the trolley very simple and convenient.

[0044] Preferably, the number of the positioning holes 9 is two.

[0045] Refer to Figure 1 and 2 As shown in FIGS. 3, 4, and 6, a first limiting groove 18 is provided on the rotating member 7; when the first handle frame 6 is unfolded to the limit angle, the first limiting groove 18 and the first handle frame 6 are clamped. After the user unfolds and rotates the first handle frame 6 to the limit angle, the first limiting groove 18 on the rotating member 7 is clamped to the first handle frame 6, making the relative positions of the rotating member 7 and the first handle frame 6 fixed, and the overall structure very stable and more convenient to use.

[0046] Preferably, the number of the first limiting grooves 18 is two.

[0047] Refer to Figures 1 to 3 As shown in FIG. 34, the push rod assembly 5 includes a push rod 19 and a connecting sleeve 20. The push rod 19 and the connecting sleeve 20 are inserted, the support rod 10 and the push rod 19 are rotatably connected, and the first handle frame 6 and the first driven rod 8 are respectively rotatably connected to the connecting sleeve 20. The rotatable connection between the support rod 10 and the push rod 19 and the rotatable connections of the first handle frame 6 and the first driven rod 8 to the connecting sleeve 20 respectively make the assembly of the folding mechanism 2 and the load-bearing mechanism 3 to the push rod assembly 5 very convenient and more convenient to use.

[0048] Preferably, the number of the push rods 19 and the connecting sleeves 20 is two each.

[0049] Refer to Figure 1 、 2 As shown in FIGS. 3 and 5, an extension portion 21 is provided on the support rod 10, and a second limiting groove 22 is provided at the end of the extension portion 21; when the support rod 10 is unfolded to the limit angle, the second limiting groove 22 is clamped with the push rod 19. After the user rotates the support rod 10 to the limit angle, the second limiting groove 22 on the support rod 10 is clamped onto the push rod 19, so that the relative positions of the support rod 10 and the push rod 19 are fixed, making the overall structure of the load-bearing mechanism 3 and the push rod assembly 5 very stable and more convenient to use.

[0050] Preferably, the number of the extension portions 21 is two.

[0051] Refer to Figures 1 to 3 As shown in the figure, a second handle frame 23 is further included, and the second handle frame 23 is connected to the rotating member 7. The user can use the second handle frame 23 to share the weight of the cart to maintain balance, greatly improving the load-bearing capacity of the cart and making it more convenient to use.

[0052] Refer to Figures 1 to 3 As shown in the figure, the shapes of the first handle frame 6 and the second handle frame 23 are both in a "U" shape. The "U"-shaped first handle frame 6 and second handle frame 23 provide places for the user to hold, allowing for better exertion of force, and the "U" shape design results in a better stress structure for the first handle frame 6 and the second handle frame 23, enabling them to withstand greater tensile forces.

[0053] Refer to Figure 3 、 7 As shown in FIGS. and, gaskets 24 are provided between the end of the second driven rod 11 and the first driven rod 8 and between the end of the second driven rod 11 and the front wheel 15. The rotating shaft 14 passes through the gasket 24, and the gasket 24 is attached to the side wall of the second driven rod 11. The provision of the gasket 24 effectively fills the gaps between the end of the second driven rod 11 and the first driven rod 8 and the front wheel 15, making the second driven rod 11 more stable during rotation and preventing situations such as jamming caused by the second driven rod 11 shaking and shifting.

[0054] Preferably, the number of the gaskets 24 is four.

[0055] When the utility model is in use, the user drives the first handle frame 6 to rotate and unfold on the connecting sleeve 20, so that the rotating member 7 and the first driven rod 8 rotate synchronously, driving the rotating shaft 14 to drive the second driven rod 11 to move, causing the support rod 10 to rotate on the push rod 19 until the first handle frame 6 is unfolded to the limit angle, the support rod 10 is unfolded to the limit angle, and when the rotating shaft 14 is located within the clamping section 17, the cart is fully unfolded, and the user can use the cart to carry heavy objects.

[0056] The above are only the preferred embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present utility model.

Claims

1. A portable folding cart, comprising a push-pull mechanism (1), a folding mechanism (2) and a load-bearing mechanism (3), wherein the push-pull mechanism (1) comprises a gripping member (4) and a push rod assembly (5) connected to each other, characterized in that: The folding mechanism (2) comprises a first handle frame (6), a rotating member (7) and a first driven rod (8); the first handle frame (6) and the push rod assembly (5) are rotatably connected; the rotating member (7) is rotatably connected to the first handle frame (6); one end of the first driven rod (8) is rotatably connected to the push rod assembly (5); the other end of the first driven rod (8) is rotatably connected to the rotating member (7); the first handle frame (6), the rotating member (7), the first driven rod (8) and the push rod assembly (5) together form a four-bar mechanism; a positioning hole (9) is provided on the first driven rod (8) ), the positioning hole (9) is close to the push rod assembly (5), the load-bearing mechanism (3) comprises a support rod (10) and a second driven rod (11), the support rod (10) and the push rod assembly (5) are rotatably connected, the support rod (10) is connected to a rear wheel (12), the second driven rod (11) and the support rod (10) are rotatably connected, and a strip hole (13) is formed on the second driven rod (11); and further comprises a rotating shaft (14), the rotating shaft (14) passes through the strip hole (13) and extends into the positioning hole (9), and the rotating shaft (14) is connected to a front wheel (15); When the first handle frame (6) is unfolded to an extreme angle and the support rod (10) is unfolded to an extreme angle, the rotation axis (14) is located at one end of the strip hole (13) close to the push rod assembly (5).

2. A portable folding cart according to claim 1, characterized in that: The strip-shaped hole (13) is arc-shaped, and the middle portion of the strip-shaped hole (13) protrudes toward one side of the folding mechanism (2).

3. A portable folding cart according to claim 2, characterized in that: The positioning hole (9) is in a strip shape, and comprises an arc segment (16) and a clamping segment (17). The clamping segment (17) is closer to the rotational connection between the support rod (10) and the second driven rod (11) than the arc segment (16).

4. A portable folding cart according to claim 1, 2 or 3, characterized in that: The rotating member (7) is provided with a first limiting groove (18); when the first handle frame (6) is unfolded to a limit angle, the first limiting groove (18) and the first handle frame (6) are engaged with each other.

5. A portable folding cart according to claim 4, characterized in that: The push rod assembly (5) comprises a push rod (19) and a connecting sleeve (20), the push rod (19) and the connecting sleeve (20) are plugged into each other, the support rod (10) and the push rod (19) are rotatably connected, and the first handle frame (6) and the first driven rod (8) are respectively rotatably connected to the connecting sleeve (20).

6. A portable folding cart according to claim 5, characterized in that: The support rod (10) is provided with an extension portion (21), and a second limiting groove (22) is provided at the end of the extension portion (21); when the support rod (10) is unfolded to a limit angle, the second limiting groove (22) and the push rod (19) are engaged.

7. A portable folding cart according to claim 1 or 2 or 3 or 5 or 6, characterized in that: It also comprises a second handle frame (23), wherein the second handle frame (23) is connected to the rotating member (7).

8. A portable folding cart according to claim 7, characterized in that: The first handle frame (6) and the second handle frame (23) are both in a U-shape.

9. A portable folding cart according to claim 1 or 2 or 3 or 5 or 6 or 8, characterized in that: A gasket (24) is provided between the end of the second driven rod (11) and the first driven rod (8) and between the end of the second driven rod (11) and the front wheel (15); the rotating shaft (14) passes through the gasket (24); and the gasket (24) is attached to the side wall of the second driven rod (11).

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