Outdoor folding cart with reinforced rear frame

Abstract

The utility model relates to a rear frame reinforced outdoor folding cart, which belongs to the field of outdoor leisure articles and comprises a front frame, a rear frame, a folding mechanism for connecting the front frame and the rear frame, a group of front wheels mounted on the front frame and a group of rear wheels mounted on the rear frame. The rear frame comprises at least two frame units and a reinforcing cross beam connected with the frame units; the frame unit comprises a first vertical pipe, a second vertical pipe located on the front side of the first vertical pipe and a locking clamp for locking the first vertical pipe and the second vertical pipe. The reinforcing cross beam is provided with a welding block which corresponds to the frame unit and is used for connecting and fixing the first vertical pipe and the second vertical pipe, and the welding block is located between the first vertical pipe and the second vertical pipe. The rear frame of the outdoor folding cart has the effect of reducing the probability of deformation of the rear frame of the outdoor folding cart in the cargo carrying and transporting process.

Description

Technical Field

[0001] The present application relates to the field of outdoor leisure products, and in particular to an outdoor folding cart with a reinforced rear frame. Background Art

[0002] Outdoor folding carts are common outdoor equipment for camping and picnics. They can not only be used to place items for easy storage and transportation, but some outdoor folding carts can also be used as temporary strollers for infants and young children. Infants and young children can be temporarily placed in the folding carts, reducing the probability of accidents involving infants and young children outdoors.

[0003] The outdoor folding cart includes a folding frame and a wheel assembly mounted on the folding frame. The folding frame includes a front frame, a rear frame and a folding mechanism connected between the front frame and the rear frame. The front frame and the rear frame are usually rectangular frames connected by metal pipes, and in order to facilitate the movement of the outdoor folding cart, a push-pull handle is usually provided on the upper part of the rear frame. The wheel assembly includes a set of front wheels mounted on the front frame and a set of rear wheels mounted on the rear frame.

[0004] With respect to the above-mentioned related technologies, the inventors believe that since the push-pull handle is connected to the upper part of the rear frame, when the outdoor folding cart carries a large amount of items, the user pushes and pulls the outdoor folding cart through the push-pull handle, causing the rear frame to bear a large bending force, which can easily cause the rear frame to deform. Utility Model Content

[0005] In order to reduce the probability of deformation of the rear frame of an outdoor folding cart during the transportation of goods, the present application provides an outdoor folding cart with a reinforced rear frame.

[0006] The present application provides an outdoor folding cart with a reinforced rear frame, which adopts the following technical solution:

[0007] A rear-frame reinforced outdoor folding cart comprises a front frame, a rear frame, a folding mechanism for connecting the front frame and the rear frame, a group of front wheels mounted on the front frame, and a group of rear wheels mounted on the rear frame; the rear frame comprises at least two frame units and a reinforcing crossbeam connecting the frame units; the frame unit comprises a first vertical pipe, a second vertical pipe located in front of the first vertical pipe, and a locking clamp for locking the first vertical pipe and the second vertical pipe; the reinforcing crossbeam has a welding block corresponding to the frame unit and used for connecting and fixing the first vertical pipe and the second vertical pipe, and the welding block is located between the first vertical pipe and the second vertical pipe.

[0008] By adopting the above technical solution, at least two frame units and a reinforced crossbeam are used to form a rear frame. Compared with a traditional square frame rear frame, the above rear frame forms a three-dimensional frame structure with ideal structural strength. When the rear frame is pushed or pulled, the welding blocks and locking clamps in the rear frame will disperse the push and pull forces to the corresponding first riser and second riser, thereby reducing the probability of deformation of the rear frame of the outdoor folding cart during the transportation of goods.

[0009] Optionally, the number of the locking clamps in the frame unit is not less than two, and the locking clamps are arranged on both the upper and lower sides of the welding block.

[0010] By adopting the above technical solution, the structural strength of the rear frame can be further improved, so that the force transmission between the first vertical pipe and the second vertical pipe in the length direction is more uniform, and the probability of deformation of the rear frame of the outdoor folding cart during the transportation of goods is further reduced.

[0011] Optionally, the locking clamp includes a first locking portion and a second locking portion; the first locking portion has a first through hole for arranging the first riser and the first locking portion is locked to the first riser by screws; the second locking portion has a second through hole for arranging the second riser.

[0012] By adopting the above technical solution, since the main function of the locking clamp is to limit the relative horizontal position of the first vertical pipe and the second vertical pipe and to transmit the horizontal push-pull force between the first vertical pipe and the second vertical pipe, the structure of the above locking clamp adopts a screw to lock the first locking part and the first vertical pipe and make the second locking part and the second vertical pipe sleeve-matched, not only the above related requirements are met, but also the installation of the locking clamp on the first vertical pipe and the second vertical pipe is more convenient, which facilitates the assembly of the rear frame.

[0013] Optionally, each of the first risers is provided with a first support, and a first connecting rod is connected between adjacent first supports; each of the second risers is provided with a second support, and a second connecting rod is connected between adjacent second supports.

[0014] By adopting the above technical solution, the arrangement of the first support and the first connecting rod forms a planar frame structure between the first connecting rod, the first support and the first connecting rod, and a planar frame structure is also formed between the second vertical pipe, the second support and the second supporting rod, which helps to improve the overall structural strength of the rear frame and further reduce the probability of deformation of the rear frame of the outdoor folding cart during the transportation of goods.

[0015] Optionally, the number of the frame units in the rear frame is two, and the two frame units are located on both sides of the rear frame; and the rear wheel is mounted on the bottom end of the first riser.

[0016] By adopting the above technical solution, the structure of the frame unit in the rear frame is specifically disclosed, and the rear frame is composed of two frame units, so that the structure of the rear frame is relatively simple, which is conducive to the production and assembly of the rear frame in actual production.

[0017] Optionally, the rear wheel and the front wheel are both universal wheels, and the rear wheel includes a fixed seat installed on the first vertical tube, a wheel frame rotatably matched with the fixed seat, and a wheel body installed on the wheel frame; a limiting seat is provided at the front end of the wheel frame, and the limiting seat is provided with a limiting hole for inserting the second vertical tube, and there is a gap between the inner wall of the limiting hole and the outer wall of the second vertical tube.

[0018] By adopting the above technical solution, the front wheels can deflect normally, and the rear wheels can deflect slightly, so that when the above-mentioned rear-frame reinforced outdoor folding cart is moved outdoors, the rear-frame reinforced outdoor folding cart can turn normally, and when moving on uneven roads, the rear wheels will not deflect at a large angle, making it easier for users to push the above-mentioned rear-frame reinforced outdoor folding cart and the travel route more accurate.

[0019] Optionally, the maximum deflection angle of the rear wheels is no greater than ±6°.

[0020] By adopting the above technical solution, the maximum deflection angle of the rear wheel can be adjusted by adjusting the gap between the inner wall of the limiting hole and the outer wall of the second support rod. The limitation of the maximum deflection angle of the rear wheel helps to ensure the user's pushing operability of the above rear frame reinforced outdoor folding cart.

[0021] Optionally, the rear frame is further provided with a push-pull handle, and both ends of the push-pull handle are provided with handle sleeves arranged corresponding to the first vertical pipe, and the handle sleeves are sleeved on the top ends of the corresponding first vertical pipes.

[0022] By adopting the above technical solution, the setting of the push-pull handle can facilitate the user to push and pull the outdoor folding cart with a reinforced rear frame, and the push-pull handle is installed on the top of the first vertical pipe through the handle tube. This installation method is simple and convenient, and the connection strength is relatively ideal.

[0023] Optionally, the number of the folding mechanisms arranged between the front frame and the rear frame is two groups, which are a first folding mechanism and a second folding mechanism located below the first folding mechanism.

[0024] By adopting the above technical solution, two sets of folding mechanisms are set between the front frame and the rear frame, and the two sets of folding mechanisms are arranged up and down, so that after the outdoor folding cart with reinforced rear frame is opened, the structural strength of the bottom is relatively ideal, and the bottom is not prone to collapse when carrying more heavy objects.

[0025] Optionally, flip brackets for supporting the inner side of the cloth cover are rotatably mounted on both sides of the first folding mechanism.

[0026] By adopting the above technical solution, the setting of the flip bracket can support the front and rear end surfaces of the cloth cover after unfolding, which helps to improve the upright effect of the cloth cover in the unfolded state.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. A rear frame reinforced outdoor folding cart, wherein the rear frame is configured to include at least two frame units and a reinforced cross beam, so that the rear frame forms a spatial three-dimensional frame structure, thereby reducing the probability of deformation of the rear frame of the outdoor folding cart during the transportation of goods;

[0029] 2. By limiting the number of locking clamps to at least two and being located at the upper and lower sides of the welding block, and the adjacent first vertical pipes are further connected with the first connecting rod, and the adjacent second vertical pipes are further connected with the second connecting rod, the structural strength of the rear frame is further improved, and the probability of deformation of the rear frame of the outdoor folding cart during the transportation of goods is further reduced;

[0030] 3. By installing the rear wheels at the bottom of the first vertical tube and limiting the deflection angle of the rear wheels by the second vertical tube, it is easier for users to push the above-mentioned rear frame reinforced outdoor folding cart and the travel route is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of an outdoor folding cart with a reinforced rear frame in an embodiment of the present application.

[0032] Figure 2 It is a schematic diagram of the cooperation between the rear frame and the rear wheel in an embodiment of the present application.

[0033] Figure 3 Schematic diagram of a locking clamp in an embodiment of the present application.

[0034] Figure 4 It is a schematic diagram of the first reinforcing connecting rod in an embodiment of the present application.

[0035] Figure 5 It is a schematic diagram of the second reinforcement link in the embodiment of the present application.

[0036] Figure 6 It is an exploded schematic diagram of the cooperation between the rear wheel and the first upright pole in the embodiment of the present application.

[0037] Figure 7 It is a schematic diagram of the locking member in the embodiment of the present application.

[0038] Figure 8It is a schematic diagram of the second folding mechanism in an embodiment of the present application.

[0039] Fig. 9 Schematic diagram of the first folding rod, the second folding rod and the hinged frame in the embodiment of the present application.

[0040] Fig.10 It is a schematic diagram of the first folding structure in an embodiment of the present application.

[0041] Fig.11 It is an exploded schematic diagram of the cooperation between the first folding rod and the front upright rod in the embodiment of the present application.

[0042] Fig.12 yes Fig.10 A partial enlarged view of point A in the middle.

[0043] Explanation of reference numerals: 1, front frame; 11, front vertical tube; 12, front bottom tube; 13, front top rod; 14, front support; 15, hinged seat; 16, cart handle; 2, rear frame; 21, frame unit; 22, first vertical tube; 23, second vertical tube; 24, reinforcing beam; 241, main horizontal beam; 242, welding block; 25, locking clamp; 251, first locking part; 252, second locking part; 253, first through hole; 254, second through hole; 26, first reinforcing connecting rod ; 261, first connecting rod; 262, first support; 263, first support sleeve; 27, second reinforcement connecting rod; 271, second connecting rod; 272, second support; 28, push-pull handle; 281, handle sleeve; 29, auxiliary handle; 291, handle tube; 292, handle support; 293, support tube; 294, fixing bolt; 295, fixing nut; 3, front wheel; 4, rear wheel; 41, fixing seat; 411, fixing plug column; 4111, bolt through hole; 4 12. Fixed cover; 4121. Fixed notch; 413. Fixed cover; 4131. Fixed opening; 414. Locking piece; 4141. Snap ring; 4142. Pull handle; 4143. Snap convex piece; 42. Wheel frame; 421. Rotating shaft; 422. Snap ring groove; 423. Limit seat; 4231. Limit hole; 43. Wheel body; 5. First folding mechanism; 51. First folding frame; 511. First side rod; 5111. Limit convex piece; 52. Second folding frame Folding frame; 521, second side rod; 53, folding head; 54, folding sleeve; 55, first bolt; 56, first nut; 571, flip bolt; 572, flip nut; 58, flip bracket; 59, flip support; 6, second folding mechanism; 61, first folding rod; 62, second folding rod; 63, articulated frame; 631, articulated groove; 632, articulated bolt; 633, articulated nut; 64, first rotating tube; 65, second rotating tube; 66, first slide groove. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-12 This application is described in further detail.

[0045] The present application embodiment discloses an outdoor folding cart with a reinforced rear frame. Figure 1 The rear frame reinforced outdoor folding stroller comprises a folding frame and a cloth cover mounted on the folding frame. The folding frame comprises a front frame 1, a rear frame 2, a folding mechanism for connecting the front frame 1 and the rear frame 2, a set of front wheels 3 mounted on the front frame 1, and a set of rear wheels 4 mounted on the rear frame 2.

[0046] Reference Figure 2 The rear frame 2 includes at least two frame units 21 and a reinforcing crossbeam 24 connecting the frame units 21. In this embodiment, the rear frame 2 has two frame units 21 and are located at the left and right sides of the rear frame 2 respectively.

[0047] Reference Figure 2 The frame unit 21 includes a first riser 22, a second riser 23 located in front of the first riser 22, and a locking fixture 25 for locking the first riser 22 and the second riser 23. The first riser 22 and the second riser 23 are both hollow metal round tubes and are arranged vertically.

[0048] Reference Figure 2 and Figure 3 The locking clamp 25 is a double-tube type clamp, and the locking clamp 25 has a first locking portion 251 for cooperating with the first vertical pipe 22 and a second locking portion 252 for cooperating with the second vertical pipe 23. The first locking portion 251 has a first through hole 253 for arranging the first vertical pipe 22, and the first locking portion 251 and the first vertical pipe 22 are locked by screws. The second locking portion 252 has a second through hole 254 for arranging the second vertical pipe 23, and the second locking portion 252 is not provided with a screw for locking the second vertical pipe 23, so that the second locking portion 252 is only sleeved on the second vertical pipe 23 and is used to define the axis of the second vertical pipe 23, thereby facilitating the assembly between the second vertical pipe 23 and the locking clamp 25. In this embodiment, the number of the locking clamps 25 in the frame unit 21 is two, and the two locking clamps 25 are respectively located at the upper part and the lower part of the frame unit 21.

[0049] Reference Figure 2 The reinforcement beam 24 includes a main beam 241 and welding blocks 242 welded and fixed at both ends of the main beam 241 and used to cooperate with the frame unit 21. The welding block 242 is arranged horizontally, and both ends of the welding block 242 have welding arc surfaces for fitting with the first riser 22 / second riser 23, so that the welding block 242 can better fit with the first riser 22 / second riser 23, so that the welding strength between the welding block 242 and the first riser 22 / second riser 23 is more ideal. Among them, the welding block 242 is located between the two locking clamps 25.

[0050] Reference Figure 2 and Figure 4 The rear frame 2 is provided with a first reinforcing link 26 connected to the two first vertical pipes 22 and arranged horizontally. The first reinforcing link 26 includes a first link 261 and two first supports 262 respectively arranged at both ends of the first link 261. The first support 262 is sleeved on the outside of the first vertical pipe 22 and fixed to the first vertical pipe 22 by screws. The two first supports 262 are provided with a first support sleeve 263 for inserting the first link 261 on the opposite side. The first support sleeve 263 and the first link 261 are also fixed by screws.

[0051] Reference Figure 2 and Figure 5 The rear frame 2 is provided with a second reinforcing link 27 connected to the two second vertical pipes 23 and arranged horizontally. The second reinforcing link 27 includes a second link 271 and two second supports 272 respectively arranged at both ends of the second link 271. The second support 272 is sleeved on the top of the second vertical pipe 23 and fixed to the second vertical pipe 23 by screws. The two second supports 272 are provided with arrangement grooves for arranging the second link 271 on opposite sides, and the second supports 272 and the second link 271 are also fixed by rivets.

[0052] Reference Figure 2 The rear frame 2 is provided with a push-pull handle 28 connected to the top of the two first vertical pipes 22. Both ends of the push-pull handle 28 are provided with a handle sleeve 281 for sleeved on the top of the first vertical pipe 22. The handle sleeve 281 and the top of the first vertical pipe 22 are connected and fixed by two sets of rivets.

[0053] Reference Figure 2 and Figure 6 The rear frame 2 is also provided with an auxiliary handle 29. The auxiliary handle 29 includes a handle tube 291 that is U-shaped as a whole and two handle supports 292 for connecting the ends of the handle tube 291. The handle support 292 is sleeved on the first vertical pipe 22 and has a support tube 293 extending toward the end of the handle tube 291. The handle support 292 is provided with a fixing bolt 294 that penetrates the handle support 292 and is coaxially matched with the support tube 293, and the fixing bolt 294 is also provided with a fixing nut 295. Among them, the end of the handle tube 291 is provided with a through hole for the end of the fixing bolt 294 to pass through, and the end of the handle tube 291 is locked on the fixing bolt 294 by the fixing nut 295.

[0054] Reference Figure 2 and Figure 6The rear wheel 4 is a universal wheel and is installed at the bottom of the first vertical tube 22. The rotation axis 421 of the rear wheel 4 coincides with the axis of the first vertical tube 22. The rear wheel 4 includes a fixing seat 41 fixed at the bottom of the first vertical tube 22, a wheel frame 42 rotatably matched with the fixing seat 41, and a wheel body 43 installed on the wheel frame 42. A vertically arranged rotation axis 421 is provided at the top of the wheel frame 42. A snap ring groove 422 is provided at the bottom circumferentially of the rotation axis 421.

[0055] Reference Figure 2 and Figure 6 The fixing seat 41 includes a fixing plug 411 inserted into the first vertical pipe 22, a fixing cover 412 connected to the bottom of the fixing plug 411, a fixing cover 413 covering the lower end opening of the fixing cover 412, and a locking member 414 slidably mounted on the fixing cover 412 and used to lock the rotating shaft 421. Among them, the top of the fixing plug 411 is provided with a bolt through hole 4111 for the fixing bolt 294 to pass through. The bottom of the fixing plug 411 also has a rotating tube cavity for the rotating shaft 421 to be rotatably arranged.

[0056] Reference Figure 6 The fixing cover 413 is mounted on the fixing cover body 412 by screws, and a sliding gap for the locking member 414 to slide is formed between the fixing cover 413 and the fixing cover body 412. The fixing cover 413 is provided with a fixing opening 4131 that penetrates the upper and lower surfaces and is used for inserting the rotating shaft on the wheel frame 42, so that the rotating shaft 421 can be inserted into the fixing seat 41.

[0057] Reference Figure 6 and Figure 7 The locking member 414 includes a snap ring piece 4141 that can be arranged outside the rotating shaft and a pull-out handle 4142 connected to one side of the snap ring piece 4141. The snap ring piece 4141 is provided with a snap-in protrusion 4143 that can be snapped into the snap ring groove 422 of the rotating shaft 421 on the inner edge. The fixed cover body 412 is provided with a fixed notch 4121 on the side wall for the pull-out handle 4142 to extend outside the fixed cover body 412. When the rotating shaft 421 is inserted into the fixed seat 41, the pull-out handle 4142 can be pulled to make the snap-in protrusion 4143 snap into the snap ring groove 422 of the rotating shaft 421, thereby realizing the rotational cooperation between the wheel frame 42 and the fixed seat 41, and making it difficult for the wheel frame 42 to fall off from the fixed seat 41.

[0058] Reference Figure 2, a limiting seat 423 is provided at the front end of the wheel frame 42. A limiting hole 4231 is provided on the limiting seat 423 for inserting the bottom end of the second vertical pipe 23. The limiting hole 4231 is a circular hole. When the second vertical pipe 23 is inserted into the limiting hole 4231 of the limiting seat 423, there is a gap between the inner wall of the limiting hole 4231 and the outer wall of the second vertical pipe 23, so that the rear wheel 4 can be slightly deflected. In this embodiment, the maximum deflection angle of the rear wheel 4 is not greater than ±6°. Here, the maximum deflection angle is not greater than ±6°, which means that when the original state of the rear wheel 4 is the forward state, the rear wheel 4 can rotate in the clockwise direction or in the counterclockwise direction at a maximum angle of 6°.

[0059] Reference Figure 1 The front frame 1 is a rectangular frame structure, including two vertically arranged front vertical tubes 11, a front bottom tube 12 welded and fixed to the bottom of the two front vertical tubes 11, and a front push rod 13 installed at the top of the two front vertical tubes 11. Both ends of the front push rod 13 are provided with front supports 14 installed at the top of the front vertical tube 11. The front support 14 is fixed to the front vertical tube 11 by screws. The two front supports 14 are provided with arrangement grooves for arranging the front push rods 13 on opposite sides, and the front supports 14 and the front push rods 13 are fixed by rivets.

[0060] Reference Figure 1 and Figure 2 The front wheel 3 is a universal wheel and is installed at the bottom of the front standpipe 11. Among them, the front wheel 3 is consistent with the structure of the rear wheel 4 except that the limit seat 423 is not set on the wheel frame 42.

[0061] Reference Figure 1 The front frame 1 is fixedly connected to a hinge seat 15 on the front side of the front bottom tube 12, and a cart handle 16 is rotatably installed on the hinge seat 15, so that the user can move the rear-frame reinforced outdoor folding cart forward through the cart handle 16, providing another operating method for the rear-frame reinforced outdoor folding cart.

[0062] Reference Figure 1 There are two groups of folding mechanisms disposed between the front frame 1 and the rear frame 2. The two groups of folding structures are a first folding mechanism 5 and a second folding mechanism 6 located below the first folding mechanism 5.

[0063] Reference Figure 8 and Fig. 9The second folding mechanism 6 includes two sets of folding connecting rods arranged opposite to each other on the left and right. The folding connecting rod is a double-rod folding structure, and includes a first folding rod 61 and a second folding rod 62. The end of the first folding rod 61 and the end of the second folding rod 62 are hingedly matched through a hinge frame 63. The hinge frame 63 has a hinge groove 631 for the end of the first folding rod 61 and the end of the second folding rod 62 to be stacked up and down, and the hinge frame 63 is provided with a hinge bolt 632 that passes through the hinge frame 63, the first folding rod 61 and the second folding rod 62. The hinge bolt 632 is also provided with a hinge nut 633.

[0064] Reference Figure 8 and Fig. 9 The first folding rod 61 is connected to a first rotating tube 64 rotatably sleeved on the outside of the front vertical tube 11 at the end away from the articulated frame 63. The second folding rod 62 is connected to a second rotating tube 65 rotatably sleeved on the outside of the second vertical tube 23 at the end away from the articulated frame 63. The folding function of the second folding mechanism 6 is achieved by the horizontal rotation of the first rotating tube 64 on the front vertical tube 11, the horizontal hinge connection of the ends of the first folding rod 61 and the second folding rod 62, and the horizontal rotation of the second rotating tube 65 on the second vertical tube 23. When the second folding mechanism 6 is in the expanded state, the two articulated frames 63 in the two sets of folding links abut against the limit position.

[0065] Reference Figure 1 and Fig.10 The first folding mechanism 5 is a two-fold frame structure, and includes a first folding frame 51 and a second folding frame 52 that are hingedly matched. The first folding frame 51 is hinged to the front frame 1, and the second folding frame 52 is hinged to the rear frame 2.

[0066] Reference Fig.10 and Fig.11 The first folding frame 51 has two ends on the side away from the second folding frame 52, which are provided with folding heads 53 for articulating with the front vertical pipe 11. The front vertical pipe 11 is sleeved with a folding sleeve 54 for cooperating with the folding head 53. The folding sleeve 54 is provided with a first bolt 55 that penetrates the folding sleeve 54 and the front vertical pipe 11. The folding head 53 has a through hole for the end of the first bolt 55 to pass through, and the first bolt 55 is also provided with a first nut 56 for locking the folding head 53 on the first bolt 55.

[0067] Reference Figure 8 and Fig.11 The folding sleeve 54 is sleeved on the outer side of the first rotating tube 64. In order to avoid the interference of the first bolt 55 on the first rotating tube 64, the first rotating tube 64 is provided with a first sliding groove 66 for the first bolt 55 to slide relative to each other.

[0068] Combination Figure 1 , Figure 6 and Fig.11The first bolt 55 also cooperates with the bolt through hole 4111 of the fixing plug post 411 of the front wheel 3.

[0069] Reference Figure 1 The hinged cooperation structure between the second folding frame 52 and the rear frame 2 is consistent with the hinged cooperation structure between the first folding frame 51 and the front frame 1, and will not be described in detail here.

[0070] Reference Fig.10 and Fig.12 The first folding frame 51 is provided with a first side rod 511 at both ends of a side facing the second folding frame 52, and the second side rods 521 arranged corresponding to the first side rod 511 are provided on both sides of the second folding frame 52. The first side rod 511 and the second side rod 521 are connected and fixed by a flip bolt 571 and a flip nut 572, so that the first side rod 511 and the second side rod 521 can rotate relative to each other and the rotation axis 421 is horizontal. The first side rod 511 is provided with a limiting convex piece 5111 to limit the flipping of the second side rod 521. When the end of the first side rod 511 abuts against the limiting convex piece 5111, the first folding frame 51 and the second folding frame 52 are both arranged horizontally.

[0071] Reference Fig.10 and Fig.11 , the first folding frame 51 and the second folding frame 52 are both rotatably mounted with a flip bracket 58 for supporting the inner side of the cloth cover on the opposite side. The first folding frame 51 and the second folding frame 52 are both provided with a flip support 59 for rotatably arranging the flip bracket 58. The flip bracket 58 is an inverted U-shaped pipe frame, and each flip bracket 58 corresponds to two flip supports 59. The lower part of the flip support 59 is fixed to the first folding frame 51 / the second folding frame 52 by screws, and the flip bracket 58 is rotatably mounted on the upper part of the flip support 59 by a bolt and nut structure. In this embodiment, two groups of flip brackets 58 are provided on the first folding frame 51 and the second folding frame 52.

[0072] Combination Figures 1 to 12 The implementation principle of the outdoor folding cart with a reinforced rear frame in the embodiment of the present application is as follows: the outdoor folding cart with a reinforced rear frame forms a spatial three-dimensional frame structure by configuring the rear frame 2 to include two frame units 21, a reinforced crossbeam 24 connecting the two frame units 21, a first reinforced connecting rod 26 and a second reinforced connecting rod 27, thereby reducing the probability of deformation of the rear frame 2 of the outdoor folding cart during the transportation of goods; and, since the front wheels and rear wheels of the outdoor folding cart with a reinforced rear frame are both universal wheel structures, the deflection angle of the rear wheel 4 is limited by the cooperation of the second vertical pipe 23 and the wheel frame 42 of the rear wheel 4, and the user can push the outdoor folding cart with a reinforced rear frame more easily and the travel route is more accurate.

[0073] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rear-frame reinforced outdoor folding cart, comprising a front frame (1), a rear frame (2), a folding mechanism for connecting the front frame (1) and the rear frame (2), a group of front wheels (3) mounted on the front frame (1), and a group of rear wheels (4) mounted on the rear frame (2); characterized in that: The rear frame (2) comprises at least two frame units (21) and a reinforcing crossbeam (24) connecting the frame units (21); the frame unit (21) comprises a first vertical pipe (22), a second vertical pipe (23) located in front of the first vertical pipe (22), and a locking clamp (25) for locking the first vertical pipe (22) and the second vertical pipe (23); the reinforcing crossbeam (24) has a welding block (242) corresponding to the frame unit (21) and used for connecting and fixing the first vertical pipe (22) and the second vertical pipe (23); the welding block (242) is located between the first vertical pipe (22) and the second vertical pipe (23).

2. The outdoor folding cart with a reinforced rear frame according to claim 1, characterized in that: The number of the locking clamps (25) in the frame unit (21) is not less than two, and the locking clamps (25) are arranged on both the upper and lower sides of the welding block (242).

3. The outdoor folding cart with a reinforced rear frame according to claim 2, characterized in that: The locking clamp (25) comprises a first locking portion (251) and a second locking portion (252); the first locking portion (251) has a first through hole (253) for arranging the first vertical pipe (22), and the first locking portion (251) and the first vertical pipe (22) are locked by screws; the second locking portion (252) has a second through hole (254) for arranging the second vertical pipe (23).

4. The outdoor folding cart with a reinforced rear frame according to claim 1, characterized in that: The first risers (22) are each provided with a first support (262), and first connecting rods (261) are connected between adjacent first supports (262); the second risers (23) are each provided with a second support (272), and second connecting rods (271) are connected between adjacent second supports (272).

5. The outdoor folding cart with a reinforced rear frame according to claim 1, characterized in that: The number of the frame units (21) in the rear frame (2) is two, and the two frame units (21) are located on both sides of the rear frame (2); the rear wheel (4) is installed at the bottom end of the first vertical pipe (22).

6. The outdoor folding cart with a reinforced rear frame according to claim 5, characterized in that: The rear wheel (4) and the front wheel (3) are both universal wheels. The rear wheel (4) comprises a fixing seat (41) mounted on the first vertical tube (22), a wheel frame (42) rotatably matched with the fixing seat (41), and a wheel body (43) mounted on the wheel frame (42); a limiting seat (423) is arranged at the front end of the wheel frame (42), and the limiting seat (423) is provided with a limiting hole (4231) for inserting the second vertical tube (23), and a gap exists between the inner wall of the limiting hole (4231) and the outer wall of the second vertical tube (23).

7. The outdoor folding cart with a reinforced rear frame according to claim 6, characterized in that: The maximum deflection angle of the rear wheel (4) is no greater than ±6°.

8. The rear frame reinforced outdoor folding cart according to claim 5, characterized in that: The rear frame (2) is also provided with a push-pull handle (28), and both ends of the push-pull handle (28) are provided with handle sleeves (281) arranged corresponding to the first vertical pipe (22), and the handle sleeves (281) are sleeved on the top end of the corresponding first vertical pipe (22).

9. The outdoor folding cart with a reinforced rear frame according to claim 5, characterized in that: The number of the folding mechanisms arranged between the front frame (1) and the rear frame (2) is two groups, which are respectively a first folding mechanism (5) and a second folding mechanism (6) located below the first folding mechanism (5).

10. The outdoor folding cart with a reinforced rear frame according to claim 9, characterized in that: Turnover brackets (58) for supporting the inner side of the cloth cover are rotatably mounted on both sides of the first folding mechanism (5).

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