Double-layer folding trolley

Abstract

The utility model discloses a double-layer folding trolley which comprises an upper bearing plate, a lower bearing plate, a pushing handle, two front castors and two rear castors, and the upper bearing plate is located above the lower bearing plate and is respectively connected with the lower bearing plate and the pushing handle through a connecting rod mechanism. The two rear trundles are rotationally connected to the left side and the right side of the rear end of the lower bearing plate through wheel shafts respectively, a reinforcing pipe is arranged at the rear end of the lower portion of the lower bearing plate, the inner ends of the two wheel shafts are inserted into pipe openings of the corresponding ends of the reinforcing pipe respectively, sealing covers are arranged at the positions, corresponding to the two ends of the reinforcing pipe, of the lower portion of the lower bearing plate respectively, and the two ends of the reinforcing pipe are arranged in the sealing covers on the corresponding sides respectively. The reinforcing pipe of the double-layer folding trolley can improve the bearing capacity of the rear end of the lower bearing plate, and the sealing cover can guarantee the installation stability of the reinforcing pipe, so that the reinforcing pipe can support the lower bearing plate and the two wheel shafts more stably, the lower bearing plate and the two rear foot wheels can bear larger loads, and articles can be transported more conveniently and safely.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the transportation tool technical field, concretely relates to a double -deck folding trolley. BACKGROUND

[0002] The existing folding flat trolley has single-layer bearing plate structure and double-layer bearing plate structure, the folding flat trolley with single-layer bearing plate structure is more common, and the technology is very mature, and the bearing capacity is relatively strong, but the disadvantage is that less things can be placed, resulting in less things being transported at a time. In order to solve the problem that the folding flat trolley with single-layer bearing plate structure transports less things at a time, the folding flat trolley with double-layer bearing plate structure emerges as the times require.

[0003] For example, the double-layer folding flat trolley disclosed in Chinese Utility Model Patent Publication No. CN211055192U includes a caster unit, a lower bearing plate, an upper bearing plate and a push handle, the caster unit is arranged at the bottom of the lower bearing plate, the lower end of the push handle is connected with the lower bearing plate, the upper bearing plate is arranged above the lower bearing plate and connected with the lower bearing plate and the push handle through a planar linkage mechanism, and it further includes a front support mechanism capable of supporting the front part of the upper bearing plate with the lower bearing plate as a support plane. The double-layer folding flat trolley has the beneficial effect of providing support force for the front part of the upper bearing plate through the front support mechanism in addition to the support force provided by the linkage mechanism for the rear part of the upper bearing plate, thereby improving the bearing capacity of the upper bearing plate and the overall transportation capacity.

[0004] However, the above-mentioned double-layer folding flat trolley still has some shortcomings. The two rear casters of the above-mentioned trolley are directly connected with the bearing plate through the axle, without a reinforcing structure, which makes the rear end of the lower bearing plate insufficient in stress and unstable in bearing, and the connection between the rear caster and the bearing plate is also unstable, so that the lower bearing plate and the rear caster are easily damaged due to excessive load, affecting the transportation of goods. UTILITY MODEL CONTENTS

[0005] In view of the above shortcomings of the prior art, the utility model aims to provide a double-layer folding trolley with stable structure.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a double-layer folding handcart, including an upper support plate, a lower support plate, a push handle, two front casters located at the front end of the lower support plate, and two rear casters located at the rear end of the lower support plate. The upper support plate is located above the lower support plate and is connected to the lower support plate and the push handle respectively through a linkage mechanism. The two rear casters are rotatably connected to the left and right sides of the rear end of the lower support plate through wheel axles. A reinforcing tube is provided at the rear end of the lower support plate. The inner ends of the two wheel axles are respectively inserted into the corresponding ends of the reinforcing tube. A cap is provided at both ends of the reinforcing tube on the lower support plate, and the two ends of the reinforcing tube are respectively placed in the caps on the corresponding sides.

[0007] In the above solution, a reinforcing tube is installed at the rear end of the lower load-bearing plate. The reinforcing tube can improve the load-bearing capacity of the rear end of the lower load-bearing plate. The inner ends of the two wheel axles are respectively inserted into the corresponding ends of the reinforcing tube, thereby improving the connection stability between the rear casters and the lower load-bearing plate. The cover can also ensure the installation stability of the reinforcing tube, so that the reinforcing tube can stably support the lower load-bearing plate and the two wheel axles. This allows the lower load-bearing plate and the two rear casters to withstand greater loads, making the transportation of goods more convenient and safer.

[0008] Furthermore, the two ends of the aforementioned push handle are respectively provided with rotating rods. The aforementioned linkage mechanism includes a first link, a second link, and a third link. The lower end of the rotating rod is provided with an inner turntable, and the upper end of the first link is provided with an outer turntable. The inner and outer turntables are stacked on top of each other and rotatably connected, so that the rotating rod can be opened and folded by rotating its inner turntable relative to the outer turntable of the first link. The rear end of the aforementioned upper load-bearing plate is located between the two inner turntables. The lower end of the first link is slidably connected to the side of the lower load-bearing plate. The second link and the first link are hinged to each other in an X shape. The lower end of the second link is rotatably connected to the rear end of the lower load-bearing plate. One end of the third link is rotatably connected to the upper end of the second link, and the other end is rotatably connected to the rotating rod. In use, when the rotating rod is in the open state, the upper load-bearing plate is parallel to the upper part of the lower load-bearing plate. At this time, it is the open state of the double-layer folding handcart. In this state, both the upper and lower load-bearing plates can be used to carry items, thereby enabling the handcart to transport more items. When the lever is folded, the upper load-bearing plate is stacked on top of the lower load-bearing plate, which is the folded state of the double-layer folding trolley. The trolley is in its smallest size in this state, making it convenient to carry and store.

[0009] Furthermore, the aforementioned double-layer folding trolley also includes a locking mechanism for locking the rotating rod in the open state. By locking the rotating rod in the open state through the locking mechanism, it is impossible to rotate, which can ensure the structural stability of the trolley in the open state and make transportation more convenient.

[0010] Furthermore, the aforementioned locking mechanism includes a switch slidably mounted on the push handle, slide rods respectively located within the two rotating rods, a second spring, a positioning block on the slide rod, and a pull rope. The two ends of the pull rope are connected to the upper ends of the two slide rods. A slot is provided on the inner side of the outer turntable. When the rotating rod is in the open state and without external force, the second spring pushes the slide rod to a position where the positioning block engages with the slot on the outer turntable. At this point, the rotating rod cannot rotate due to the engagement of the positioning block and the slot, thus locking the rotating rod in the open state and ensuring the structural stability of the trolley in the open state. Pressing the switch will cause the pull rope to pull the slide rod to a position where the positioning block and the slot on the outer turntable are misaligned, thereby releasing the lock on the rotating rod and allowing the rotating rod to rotate, thus converting the trolley into a folded state.

[0011] Furthermore, the aforementioned push handle is equipped with a pulley, and the outer circumference of the pulley is provided with a buckle groove. The pull rope is placed in the buckle groove and abuts against the side wall of the pulley. The pulley can improve the installation stability of the pull rope and make the pull rope slide more smoothly along the side wall of the pulley, thus making it easier to press the switch to drive the pull rope to pull the slide bar.

[0012] Furthermore, the upper support plate is hinged with basket buckles on opposite sides for engaging with the buckles of the shopping basket. When in use, the shopping basket is placed on the upper support plate, and the basket buckles can be rotated to engage with the buckles of the shopping basket, thus securing the shopping basket and preventing it from slipping off the upper support plate.

[0013] Furthermore, the left and right rear ends of the aforementioned upper support plate are rotatably connected to the corresponding inner turntables. When the rotating rod is in the open state, the upper support plate can rotate to a state parallel to the lower support plate and to the rotating rod. When the upper support plate rotates to a state parallel to the lower support plate, it can be used to support items; and when the upper support plate rotates to a state parallel to the rotating rod, it will not obstruct the lower support plate, making it easier for users to place items on the lower support plate.

[0014] Furthermore, the upper inner side of the second link is provided with a support part. When the upper load-bearing plate rotates to a state parallel to the lower load-bearing plate, the left and right sides of the lower load-bearing plate are respectively supported on the support parts on the corresponding sides. This can improve the structural stability of the upper load-bearing plate when it is parallel to the lower load-bearing plate.

[0015] Furthermore, the upper load-bearing plate is provided with a limiting block at its front end. When the upper load-bearing plate rotates to a state parallel to the rotating rod, the limiting block abuts against the push handle. At this time, the push handle will block the limiting block to prevent the upper load-bearing plate from rotating excessively in the direction of the rotating rod, so as to limit the upper load-bearing plate to a state parallel to the rotating rod.

[0016] Furthermore, the aforementioned double-layer folding trolley also includes a braking mechanism to prevent the rear casters from rotating. The braking mechanism includes two brake pads rotatably connected to the lower support plate, two first springs, a crankshaft, and a pedal movably connected to the rear end of the lower support plate. One end of each first spring is connected to the lower support plate, and the other end is connected to the corresponding brake pad. Both ends of the crankshaft are connected to the corresponding brake pads. Several stops are circumferentially distributed on the inner side of each rear caster. Without external force, the first springs push the brake pads to rotate to a position offset from the stops. At this point, the brake pads will not obstruct the stops of the rear casters, allowing the rear casters to rotate normally and drive the trolley. Pressing the pedal will cause the crankshaft to pull the two brake pads to rotate to a position aligned with the stops. At this point, the brake pads will obstruct the stops of the rear casters, preventing the rear casters from rotating and stopping the trolley.

[0017] This utility model's double-layer folding trolley features a reinforced tube structure, making the rear casters and lower support plate more stable and increasing its load-bearing capacity. This makes transporting goods more convenient and safer. The locking mechanism keeps the trolley in the open position, while pressing a switch allows it to be folded for easy carrying and storage. The pulleys improve the smoothness of the pull cord, making the switch easier to operate. Additionally, the basket clip secures the shopping basket to the upper support plate, preventing it from slipping off. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the double-layer folding handcart in the open state, with the upper support plate rotated to be parallel to the lower support plate, according to an embodiment of the present utility model.

[0019] Figure 2 This is a schematic diagram of the lower support plate and rear casters of the double-layer folding handcart according to an embodiment of the present invention.

[0020] Figure 3 This is an exploded view of the lower support plate and rear casters of the double-layer folding handcart according to an embodiment of the present invention.

[0021] Figure 4 This is a partial sectional view of the lower support plate and rear casters of the double-layer folding handcart according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the structure of the double-layer folding handcart in the folded state according to an embodiment of the present invention.

[0023] Figure 6 for Figure 1 Enlarged view of part A in the image.

[0024] Figure 7 for Figure 1 Enlarged view of part B in the image.

[0025] Figure 8 This is an exploded structural diagram of the upper support plate of the double-layer folding handcart according to an embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram illustrating the use of the double-layer folding handcart according to an embodiment of the present invention.

[0027] Figure 10 This is a schematic diagram of the structure of the double-layer folding handcart in the open state and with the upper load-bearing plate rotated to be parallel to the rotating rod, according to an embodiment of the present utility model. Detailed Implementation

[0028] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0029] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0031] Example 1

[0032] like Figures 1-4As shown, this embodiment provides a double-layer folding trolley, including an upper support plate 1, a lower support plate 2, a push handle 3, two front casters 41 located at the front end of the lower support plate 2, and two rear casters 42 located at the rear end of the lower support plate 2. The upper support plate 1 is located above the lower support plate 2 and is connected to the lower support plate 2 and the push handle 3 respectively through a linkage mechanism. The two rear casters 42 are rotatably connected to the left and right sides of the rear end of the lower support plate 2 through wheel axles 21. A reinforcing tube 22 is provided at the rear end of the lower support plate 2. The inner ends of the two wheel axles 21 are respectively inserted into the corresponding ends of the reinforcing tube 22. A cap 23 is provided at both ends of the lower support plate 2 corresponding to the reinforcing tube 22. The two ends of the reinforcing tube 22 are respectively placed in the cap 23 on the corresponding side.

[0033] In the above solution, a reinforcing tube 22 is provided at the rear end of the lower load-bearing plate 2. The reinforcing tube 22 can improve the load-bearing capacity of the rear end of the lower load-bearing plate 2. The inner ends of the two wheel axles 21 are respectively inserted into the corresponding ends of the reinforcing tube 22, thereby improving the connection stability between the rear caster 42 and the lower load-bearing plate 2. Furthermore, the cover 23 can also ensure the installation stability of the reinforcing tube 22, so that the reinforcing tube 22 can stably support the lower load-bearing plate 2 and the two wheel axles 21. This allows the lower load-bearing plate 2 and the two rear casters 42 to withstand greater loads, making the transportation of goods more convenient and safer.

[0034] For example Figures 2-4 As shown, the aforementioned double-layer folding trolley also includes a braking mechanism to prevent the rear casters 42 from rotating. The braking mechanism includes two brake pads 51 rotatably connected to the lower support plate 2, two first springs 52, a crankshaft 53, and a pedal 54 movably connected to the rear end of the lower support plate 2. One end of the first spring 52 is connected to the lower support plate 2, and the other end is connected to the brake pad 51 on the corresponding side. The crankshaft 53 is located below the lower support plate 2, and the middle part of the crankshaft 53 is connected to the pedal 54. The two ends of the crankshaft 53 are respectively connected to the brake pads 51 on the corresponding side. Several stops 421 are arranged along the circumference of the axis on the inner side of the two rear casters 42. Without external force, the first springs 52 will push the end of the brake pad 51 to rotate to a position that is offset from the stops 421. At this time, the brake pad 51 will not block the stops 421 of the rear casters 42, so that the rear casters 42 can rotate normally and drive the trolley. When you step on the pedal 54, the crankshaft 53 will pull the ends of the two brake pads 51 to rotate until they are aligned with the stop block 421. At this time, the brake pads 51 will block the stop block 421 of the rear wheel 42, thus preventing the rear wheel 42 from rotating and stopping the handcart from moving.

[0035] Example 2

[0036] This embodiment is a further improvement on the structure of the double-layer folding handcart in Embodiment 1. The improvement lies in, for example... Figure 1As shown, the left and right ends of the push handle are respectively provided with rotating rods 31. The linkage mechanism includes two first connecting rods 61, two second connecting rods 62, and two third connecting rods 63 arranged opposite to each other. The lower ends of the two rotating rods 31 are respectively provided with inner turntables 311, and the upper ends of the two first connecting rods 61 are respectively provided with outer turntables 611. Figure 1 (The outer turntable 611 structure is omitted). The inner turntable 311 and the outer turntable 611 are stacked and rotatably connected to each other, so that the rotating rod 31 can be opened and folded relative to the outer turntable 611 of the first connecting rod 61 through its inner turntable 311. The rear end of the upper load-bearing plate 1 is located between the two inner turntables 311. The lower ends of the two first connecting rods 61 are slidably connected to the corresponding sides of the lower load-bearing plate 2. The two second connecting rods 62 are X-shapedly hinged to the corresponding first connecting rods 61. The lower ends of the two second connecting rods 62 are rotatably connected to the corresponding rear ends of the lower load-bearing plate 2. The front ends of the two third connecting rods 63 are rotatably connected to the upper ends of the corresponding second connecting rods 62. The rear ends of the two third connecting rods 63 are rotatably connected to the inner sidewall of the rotating rod 31 on the corresponding side.

[0037] When using the double-layer folding handcart of this embodiment, as follows: Figure 1 As shown, when the lever 31 is rotated to the open state, the upper support plate 1 is parallel to the upper position of the lower support plate 2. This is the open state of the double-layer folding trolley. In this state, both the upper support plate 1 and the lower support plate 2 can be used to carry items, allowing the trolley to transport more items. Figure 5 As shown, when the rotating rod 31 is rotated to the folded state, the upper support plate 1 is stacked on top of the lower support plate 2. At this time, it is the folded state of the double-layer folding trolley. The trolley is in the smallest size in this state, which is convenient to carry and store.

[0038] As an improvement to this embodiment, the above-mentioned double-layer folding trolley also includes a locking mechanism for locking the rotating rod 31 in the open state. By locking the rotating rod 31 in the open state through the locking mechanism, it is impossible to rotate, which can ensure the structural stability of the trolley in the open state and make transportation more convenient.

[0039] Specifically, such as Figure 1 , 6As shown in Figure 7, the locking mechanism includes a switch 71 slidably mounted on the push handle 3, slide rods 72 respectively mounted in the two rotating rods 31, two second springs 73, a positioning block 721 mounted on the slide rod 72, and a pull rope 74. The switch 71 can slide up and down relative to the push handle 3, and the upper end of the switch 71 extends out of the push handle 3. The switch 71 is connected to the pull rope 74, and the two ends of the pull rope 74 are respectively connected to the upper ends of the two slide rods 72. A slot is provided on the inner side of the outer turntable 611. The two second springs 73 are respectively placed inside the rotating rods 31 on the corresponding sides, and the two second springs 73 are fitted on the outer side of the pull rope 74. The upper end of the second spring 73 abuts against the inner side of the rotating rod 31, and the lower end of the second spring 73 abuts against the upper end of the slide rod 72. When the rotating rod 31 is in the open state and no external force is applied, the second spring 73 will push the slide rod 72 downwards until the positioning block 721 engages with the slot of the outer turntable 611. At this point, the rotating rod 31 cannot rotate due to the engagement of the positioning block 721 and the slot, thus locking the rotating rod 31 in the open state and ensuring the structural stability of the trolley in the open state. Pressing the switch 71 downwards will cause the pull rope 74 to pull the slide rod 2 upwards until the positioning block 721 and the slot of the outer turntable 611 are misaligned. This will release the lock on the rotating rod 31, allowing the rotating rod 31 to rotate and convert the trolley to the folding state. The unlocking operation is convenient.

[0040] In addition, for example Figure 6 As shown, the push handle 3 is provided with a pulley 32. The outer circumference of the pulley 32 is provided with a buckle groove 321. The pull rope 74 is placed in the buckle groove 321 and abuts against the side wall of the pulley 32. The pulley 32 can improve the installation stability of the pull rope 74 and make the pull rope 74 slide more smoothly along the side wall of the pulley 32, so that it is easier to press the switch 71 to drive the pull rope 74 to pull the slide bar 72 to slide.

[0041] Example 3

[0042] This embodiment is a further improvement on the structure of the double-layer folding handcart in Embodiment 2. The improvement lies in, for example... Figure 8 , 9 As shown, the upper support plate 1 is provided with two basket buckles 11 for engaging with the buckles of the shopping basket 8. Specifically, the upper support plate 1 has clearance grooves 10 at the middle of its front and rear sides, and rotating holes 101 on opposite sides of the clearance grooves 10. The basket buckles 11 have rotating posts on their left and right sides, and the two rotating posts of the basket buckles 11 are inserted into the rotating holes 101 on the corresponding sides, so that the rotating posts of the basket buckles 11 can rotate around the rotating holes 101. In use, when the shopping basket 8 is placed on the upper support plate 1, the basket buckles 11 can be rotated to engage with the buckles of the shopping basket 8, thus fixing the shopping basket 8 and preventing it from slipping off the upper support plate 1.

[0043] As an improvement to this embodiment, such as Figure 1, 10 As shown, the left and right rear ends of the upper support plate 1 are rotatably connected to the corresponding inner turntables 31. When the rotating rod 31 is in the open state, the upper support plate 1 can rotate to a state parallel to the lower support plate 2 and to a state parallel to the rotating rod 3. Wherein, as... Figure 1 As shown, when the upper support plate 1 is rotated to a state parallel to the lower support plate 2, the upper support plate 1 can be used to support items; and as Figure 10 As shown, when the upper support plate 1 is rotated to a state parallel to the rotating rod 31, the upper support plate 1 will not block the lower support plate 2, making it easier for users to place items on the lower support plate 2.

[0044] The upper inner side of the second link 62 is provided with a support part 621. When the upper load plate 1 rotates to a state parallel to the lower load plate 2, the left and right sides of the lower load plate 1 are respectively supported on the support part 621 on the corresponding side. This can improve the structural stability of the upper load plate 1 when it is parallel to the lower load plate 2, so that the upper load plate 1 can withstand a larger load.

[0045] In addition, the upper load-bearing plate 1 is provided with a limiting block 12 at its front end. When the upper load-bearing plate 1 rotates to a state parallel to the rotating rod 31, the limiting block 12 abuts against the front side of the push handle 3. At this time, the push handle 3 will block the limiting block 12 to prevent the upper load-bearing plate 1 from rotating excessively in the direction of the rotating rod 31, so as to limit the upper load-bearing plate 1 to a state parallel to the rotating rod 31.

[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A double-layer folding handcart, comprising an upper support plate (1), a lower support plate (2), a push handle (3), two front casters (41) located at the front end below the lower support plate (2), and two rear casters (42) located at the rear end of the lower support plate (2), wherein the upper support plate (1) is located above the lower support plate (2) and is connected to the lower support plate (2) and the push handle (3) respectively through a linkage mechanism, characterized in that: The two rear casters (42) are rotatably connected to the left and right sides of the rear end of the lower support plate (2) via axles (21). The lower support plate (2) has a reinforcing tube (22) at the rear end. The inner ends of the two axles (21) are inserted into the corresponding ends of the reinforcing tube (22). The lower support plate (2) has caps (23) at the two ends of the reinforcing tube (22) respectively. The two ends of the reinforcing tube (22) are placed in the caps (23) on the corresponding sides.

2. The double-layer folding handcart according to claim 1, characterized in that: The push handle (3) has rotating rods (31) at both ends respectively. The linkage mechanism includes a first link (61), a second link (62), and a third link (63). The lower end of the rotating rod (31) is provided with an inner turntable (311), and the upper end of the first link (61) is provided with an outer turntable (611). The inner turntable (311) and the outer turntable (611) are stacked on top of each other and rotatably connected, so that the rotating rod (31) can be opened and folded by rotating its inner turntable (311) relative to the outer turntable (611) of the first link (61). The upper load-bearing plate (1) is positioned between the two inner turntables (311) at its rear end. The lower end of the first connecting rod (61) is slidably connected to the side of the lower load-bearing plate (2). The second connecting rod (62) is hinged to the first connecting rod (61) in an X-shape. The lower end of the second connecting rod (62) is rotatably connected to the rear end of the lower load-bearing plate (2). One end of the third connecting rod (63) is rotatably connected to the upper end of the second connecting rod (62), and the other end is rotatably connected to the rotating rod (31). When the rotating rod (31) is in a folded state, the upper load-bearing plate (1) is stacked on top of the lower load-bearing plate (2).

3. The double-layer folding handcart according to claim 2, characterized in that: It also includes a locking mechanism for locking the lever (31) in the open state.

4. The double-layer folding handcart according to claim 3, characterized in that: The locking mechanism includes a switch (71) slidably mounted on the push handle (3), a slide rod (72) respectively mounted in the two rotating rods (31), a second spring (73), a positioning block (721) mounted on the slide rod (72), and a pull rope (74). The two ends of the pull rope (74) are respectively connected to the upper ends of the two slide rods (72). A slot is provided on the inner side of the outer turntable (611). When the rotating rod (31) is in the open state, the second spring (73) will push the slide rod (72) to slide to the position where the positioning block (721) and the slot of the outer turntable (611) are engaged. Pressing the switch (71) will drive the pull rope (74) to pull the slide rod (72) to slide to the position where the positioning block (721) and the slot of the outer turntable (611) are misaligned.

5. The double-layer folding handcart according to claim 4, characterized in that: The push handle (3) is provided with a pulley (32), and the pulley (32) has a groove (321) on the outer circumference. The pull rope (74) is placed in the groove (321) and abuts against the side wall of the pulley (32).

6. The double-layer folding handcart according to claim 1, characterized in that: The upper load-bearing plate (1) is hinged to basket buckles (11) on both sides for engaging with the buckles of the shopping basket.

7. The double-layer folding handcart according to claim 2, characterized in that: The upper load-bearing plate (1) is rotatably connected to the inner turntable (311) on the left and right sides of the rear end, respectively. When the rotating rod (31) is in the open state, the upper load-bearing plate (1) can rotate to a state parallel to the lower load-bearing plate (2) and to a state parallel to the rotating rod (31).

8. The double-layer folding handcart according to claim 7, characterized in that: The upper inner side of the second connecting rod (62) is provided with a support part (621). When the upper load plate (1) rotates to a state parallel to the lower load plate (2), the left and right sides of the lower load plate (1) are respectively supported on the support part (621) on the corresponding side.

9. The double-layer folding handcart according to claim 8, characterized in that: The upper load-bearing plate (1) is provided with a limiting block (12) at the front end. When the upper load-bearing plate (1) rotates to a state parallel to the rotating rod (31), the limiting block (12) abuts against the push handle (3).

10. The double-layer folding handcart according to claim 1, characterized in that: It also includes a braking mechanism to prevent the rear casters (42) from rotating. The braking mechanism includes two brake pads (51) rotatably connected to the lower support plate (2), two first springs (52), a crankshaft (53), and a pedal (54) movably connected to the rear end of the lower support plate (2). One end of the first spring (52) is connected to the lower support plate (2), and the other end is connected to the brake pad (51) on the corresponding side. Both ends of the crankshaft (53) are connected to the brake pads (51) on the corresponding side. Several stops (421) are circumferentially distributed on the inner side of both rear casters (42). Without external force, the first spring (52) will push the brake pads (51) to rotate to a position that is offset from the stops (421). Pressing the pedal (54) will drive the crankshaft (53) to pull the two brake pads (51) to rotate to a position that is aligned with the stops (421).

Images