Flat plate trolley

Abstract

The utility model discloses a flatbed handcart, including support, bearing plate, handle, two sets of caster device and locking mechanism, locking mechanism includes two fixed seat, two inserted link, be used for connecting the second connecting rod of two inserted link, be used for pulling the inserted link forward and be equipped with the slot at the rear end of two caster sleeve. When the flat plate trolley is used, when the rear caster sleeves are opened, the front ends of the inserting rods extend out of the sliding holes and are inserted into the inserting grooves of the rear caster sleeves, the caster devices can be locked in the opened state, it is guaranteed that the caster devices cannot automatically rotate and be folded in the transportation process, and transportation is convenient and safe. When not in use, the second connecting rod can be pulled by hand to drive the two inserting rods to move backwards to be separated from the inserting grooves, locking can be relieved, the rear trundle sleeve can be rotated to be in a folded state, meanwhile, the stop blocks can prevent the front ends of the inserting rods from sliding out of the sliding holes, and the situation that the rotating operation of the rear trundle sleeve is affected due to the wrong locking phenomenon is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of transportation tools, and in particular relates to a flatbed trolley. Background Art

[0002] A flatbed trolley is a means of transport used in daily life for transporting items. Existing flatbed trolley structures generally include a frame, a load-bearing plate and a handle disposed on the frame, and two sets of caster assemblies disposed on opposite sides of the frame. The caster assemblies include a front caster sleeve disposed at the front end of the frame, a front caster rotatably connected to the front caster sleeve, a rear caster sleeve disposed at the rear end of the frame, a rear caster rotatably connected to the rear caster sleeve, and a connecting rod connecting the front and rear caster sleeves. Each caster sleeve can be rotated, opened, and folded relative to the frame. When in use, one of the caster sleeves can be rotated to open, thereby driving the entire set of caster assemblies to rotate and open via the connecting rod. By rotating and opening both sets of caster assemblies, the flatbed trolley can be used to transport items. When not in use, the two sets of caster assemblies can be rotated and folded, making it easier to carry and store the trolley.

[0003] However, the existing flatbed trolleys also have shortcomings. That is, the locking of the caster device in the open state of the existing flatbed trolleys is not stable enough, so when the trolley is carrying heavy items or encountering bumpy roads, the caster device is prone to automatically rotate and fold, which makes transportation inconvenient and affects the transportation safety of the items. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a flatbed trolley capable of locking the caster device in an open state.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a flatbed trolley, comprising a bracket, a load-bearing plate and a handle arranged on the bracket, and two sets of caster devices arranged on opposite sides of the bracket, the above-mentioned caster device comprises a front caster sleeve arranged at the front end of the bracket, a front caster rotatably connected to the front caster sleeve, a rear caster sleeve arranged at the rear end of the bracket, a rear caster rotatably connected to the rear caster sleeve, and a first connecting rod for connecting the front caster sleeve and the rear caster sleeve, each caster sleeve can be rotated to open and fold relative to the bracket, and the above-mentioned flatbed trolley also includes a locking mechanism for locking the caster device in the open state, the locking mechanism includes two A fixing seat, two insertion rods, a second connecting rod for connecting the two insertion rods, a pulling mechanism for pulling the insertion rod to move forward, and blocks respectively arranged on the two rear caster sleeves. The rear ends of the two rear caster sleeves are provided with slots. The fixing seat is located at the rear side of the rear caster sleeve, and the two fixing seats are provided with sliding holes that pass through the front and rear side walls thereof. The two insertion rods are respectively inserted into the sliding holes on the corresponding sides. When the rear caster sleeve is folded after rotation, the block will be driven to block the orifice position of the sliding hole. At this time, the front end of the insertion rod is placed in the sliding hole at the rear side position corresponding to the block. When the rear caster sleeve is opened after rotation, the block will be driven to stagger with the orifice position of the sliding hole. At this time, the pulling mechanism pulls the front end of the insertion rod out of the sliding hole and inserts it into the slot of the rear caster sleeve.

[0006] When the rear caster sleeve is in use, the two rear caster sleeves can be rotated to the open state. When the rear caster sleeves rotate, the front caster sleeves will be driven to rotate through the first connecting rod, thereby opening the entire caster device. The opening of the rear caster sleeves will drive the block to stagger the position of the hole opening of the sliding hole, so that the two insertion rods will be pulled forward by the pulling mechanism without the obstruction of the block, so that the front end of the insertion rods will extend out of the sliding hole and insert into the slot of the rear caster sleeve. At this time, the rear caster sleeve cannot be rotated due to the obstruction of the insertion rod, thereby locking the rear caster sleeve in the open state, and the front caster sleeves and the rear caster sleeves are linked by the first connecting rod, which is equivalent to locking the entire caster device in the open state. This can ensure that the caster device will not automatically rotate and fold during transportation, and the structure is stable, and transportation is convenient and safe. When not in use, the second connecting rod can be pulled by hand to drive the two insertion rods to move backward and disengage the slots of the rear caster cover to release the lock, so that the rear caster cover can be rotated to the folded state. At the same time, the rear caster cover drives the stopper to rotate to the position of blocking the opening of the sliding hole, so that the stopper blocks the front end of the insertion rod from sliding out of the sliding hole and is not mistakenly inserted into the slot of the rear caster cover, thereby avoiding the occurrence of incorrect locking and affecting the rotation operation of the rear caster cover.

[0007] Furthermore, the above-mentioned handle is rotatably connected to the bracket, and the handle can be rotated to open and fold relative to the bracket. The left and right sides of the lower end of the handle are respectively provided with driving wheels, and the two rear caster sleeves are respectively provided with driven wheels. The teeth of the driving wheel and the teeth of the driven wheel are engaged with each other. Turning the handle to open will transmit the power to the driven wheel through the driving wheel to drive the rear caster sleeve to rotate and open, and turning the handle to fold will transmit the power to the driven wheel through the driving wheel to drive the rear caster sleeve to rotate and fold. In this way, only need to turn the handle to drive the two sets of caster devices to rotate, open and fold, which is easy to operate.

[0008] Furthermore, the stopper and the driven wheel are an integrated structure, and the driven wheel is inserted into the rear end of the rear caster sleeve through the connecting block, which facilitates the disassembly and assembly of the driven wheel component.

[0009] Furthermore, the rear ends of the two above-mentioned insertion rods are provided with reinforcement seats, and the two ends of the second connecting rod are respectively connected to the two reinforcement seats. The two reinforcement seats are provided with insertion blocks, and the handle is provided with a first buckle groove corresponding to the position of the insertion block. When the handle is rotated to the open state, the insertion block is inserted into the first buckle groove. At this time, the handle cannot be rotated due to the obstruction of the insertion block, thereby locking the handle in the open state.

[0010] Furthermore, connecting seats are respectively installed on the left and right sides of the lower end of the handle, and the two driving wheels are respectively arranged at the front side of the connecting seats on the corresponding sides, and the first buckle groove is opened at the rear side of the connecting seat, which facilitates the disassembly and assembly of the driving wheel components.

[0011] Furthermore, the two connecting seats are both provided with a rotating block, which is aligned with the driving wheel. The rotating block and the driving wheel are respectively connected to the left and right sides of the fixed seat on the corresponding side for rotation. This can improve the rotation stability of the handle and make the structure more stable.

[0012] Furthermore, the above-mentioned pulling mechanism includes a slider slidably arranged on the bracket, a tension spring for pulling the slider to slide forward, and a pull rope, the two ends of the pull rope are respectively connected to the slider and the reinforcement seat. In the absence of external force, the tension spring will pull the slider forward through its own elastic force, and the forward sliding of the slider will drive the pull rope to pull the reinforcement seat forward, and the reinforcement seat will drive the insertion rod to move forward at the same time, thereby realizing the structural function of the pulling mechanism to pull the insertion rod forward.

[0013] Furthermore, the above-mentioned slider is located at the rear side of the front caster sleeve, a protrusion is provided at the front end of the slider, and a second buckle groove is provided at the rear side of the front caster sleeve. When the front caster sleeve is in the open state and without external force, the tension spring will pull the protrusion of the slider into the second buckle groove of the front caster sleeve, and at the same time, the pull rope pulls the reinforcement seat to drive the front end of the insertion rod to be inserted into the slot of the rear caster sleeve. At this time, the front caster sleeve cannot rotate due to the obstruction of the protrusion, and the rear caster sleeve cannot rotate due to the obstruction of the insertion rod, thereby locking the front caster sleeve and the rear caster sleeve in the open state at the same time, and the locking is more secure.

[0014] Furthermore, a silicone sleeve is provided on the outer side of the second connecting rod, so that the user can conveniently hold the silicone sleeve with his hand to pull the second connecting rod to move backward.

[0015] Furthermore, the above-mentioned bracket is a U-shaped tubular structure, and each caster sleeve is respectively sleeved on the outside of the bracket through a ring, so that each caster sleeve can be rotated, opened and folded along the bracket through its own ring.

[0016] When the flatbed trolley of the utility model is in the folded state, the block blocks the front end of the insertion rod, preventing it from sliding out of the sliding hole and from being mistakenly inserted into the slot of the rear caster cover, thereby preventing the occurrence of incorrect locking and affecting the rotation operation of the rear caster cover. When the handle is turned to open, the caster covers can be rotated and opened. At this time, the block is offset from the sliding hole, allowing the tension spring to pull the protrusion into the second buckle groove of the front caster cover, and the pull rope to pull the front end of the insertion rod into the slot of the rear caster cover. At the same time, the insertion block of the reinforcement seat is inserted into the first buckle groove of the handle, thereby locking the front caster cover, the rear caster cover and the handle in the open state at the same time, and the locking is very stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a flatbed trolley in an open state according to an embodiment of the present invention.

[0018] Figure 2 This is a structural schematic diagram of a flatbed trolley according to an embodiment of the present invention in a folded state (the structure of the load-bearing plate is omitted in the figure).

[0019] Figure 3 This is a schematic diagram of the exploded structure of a flatbed trolley according to an embodiment of the present invention (the structure of the load-bearing plate is omitted in the figure).

[0020] Figure 4 This is a structural schematic diagram of the driving wheel and the transmission wheel of the flatbed trolley according to an embodiment of the utility model in a folded state.

[0021] Figure 5 This is a structural schematic diagram of the driving wheel and transmission wheel of the flatbed trolley in the open state according to an embodiment of the utility model.

[0022] Figure 6 for Figure 3 Enlarged view of part A in .

[0023] Figure 7 for Figure 3 Enlarged view of part B in . DETAILED DESCRIPTION

[0024] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the accompanying drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the accompanying drawings. The positional relationships depicted in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0025] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0027] Example 1

[0028] like Figure 1 、 2 As shown, this embodiment provides a flatbed handcart, comprising a bracket 1, a load-bearing plate 2 and a handle 3 provided on the bracket 1, and two sets of caster devices provided on the left and right sides of the lower side of the bracket 1, wherein the caster device comprises a front caster sleeve 41 provided at the front end of the bracket 1, a front caster 411 rotatably connected to the front caster sleeve 41, a rear caster sleeve 42 provided at the rear end of the bracket 1, a rear caster 421 rotatably connected to the rear caster sleeve 42, and a first connecting rod 43 for connecting the front caster sleeve 41 and the rear caster sleeve 42. Figure 3 As shown, the above-mentioned bracket 1 is a U-shaped tubular structure, and each caster sleeve is respectively sleeved on the outside of the bracket 1 through a ring 7, so that each caster sleeve can be rotated, opened and folded along the bracket 1 through its respective ring 7, and the load-bearing plate 2 is sleeved on the bracket 1.

[0029] The above-mentioned flatbed trolley also includes a locking mechanism for locking the caster device in the open state. The locking mechanism includes two fixed seats 51 provided on the bracket, two insertion rods 52, a second connecting rod 53 for connecting the two insertion rods 52, a pulling mechanism for pulling the insertion rods 52 forward, and blocks 54 respectively provided on the two rear caster sleeves 42. The rear ends of the two rear caster sleeves 42 are provided with slots. The two fixed seats 51 are respectively located at the rear sides of the two rear caster sleeves 42, and the two fixed seats 51 are provided with sliding holes 510 passing through the front and rear side walls thereof. The two insertion rods 52 are respectively inserted into the sliding holes 510 on the corresponding sides and can slide back and forth relative to the sliding holes 510. Figure 2 、 4 As shown, when the rear caster cover 42 is rotated to the folded state, the stopper 54 is driven to rotate to the position of blocking the opening of the sliding hole 510. At this time, the front end of the insertion rod 52 is placed in the sliding hole 510 at the rear side of the stopper 54. Figure 1 、 5 As shown, when the rear caster cover 42 is rotated to the open state, the stopper 54 is driven to rotate to a position offset from the opening of the sliding hole 510. At this time, the pulling mechanism pulls the front end of the insertion rod 52 out of the sliding hole 510 and inserted into the slot of the rear caster cover 42.

[0030] When the flatbed trolley of this embodiment is used, Figure 1 As shown, the two rear caster covers 42 can be rotated to the open state. When the rear caster covers 42 rotate, the front caster covers 41 will be driven to rotate through the first connecting rod 43, thereby opening the entire caster device. Figure 5 As shown, when the rear caster cover 42 is in the open state, the stopper 54 will be driven to stagger with the opening of the sliding hole 510, so that the two insertion rods 52 will be pulled forward by the pulling mechanism without the obstruction of the stopper 54, so that the front end of the insertion rod 52 extends out of the sliding hole 510 and is inserted into the slot of the rear caster cover 42. At this time, the rear caster cover 42 cannot rotate due to the obstruction of the insertion rod 52, thereby locking the rear caster cover 42 in the open state, and the front caster cover 41 and the rear caster cover 42 are linked by the first connecting rod 43, which is equivalent to locking the entire caster device in the open state. In this way, it can be ensured that the caster device will not automatically rotate and fold during transportation, and the structure is stable, and transportation is convenient and safe.

[0031] When not in use, Figure 2 As shown, the second connecting rod 53 can be pulled by hand to drive the two inserting rods 52 to move backward and disengage the slots of the rear caster sleeve 42 to release the lock of the rear caster sleeve 42, so that the rear caster sleeve 42 can be rotated to drive the entire caster assembly to the folded state, reducing the space occupied by the cart and making it easier to carry and store. In addition, Figure 4As shown, when the rear caster cover 42 is in the folded state, it will drive the block 54 to rotate to the position of blocking the opening of the sliding hole 510, so that the block 54 blocks the front end of the insertion rod 52 from sliding out of the sliding hole 510 and will not be mistakenly inserted into the slot of the rear caster cover 42, thereby avoiding the occurrence of incorrect locking and affecting the rotation operation of the rear caster cover 42.

[0032] Example 2

[0033] This embodiment is a further improvement on the structure of the flatbed trolley of the first embodiment. The improvement is that Figure 1-5 As shown, the above-mentioned handle 3 is rotatably connected to the rear end of the bracket 1, and the handle 3 can be rotated to open and fold relative to the bracket 1. The left and right sides of the lower end of the handle 3 are respectively provided with driving wheels 31, and the rear ends of the two rear caster sleeves 42 are respectively provided with driven wheels 422. The teeth of the driving wheel 31 are engaged with the teeth of the driven wheel 422. Rotating the handle 3 to open will transmit the power to the driven wheel 422 through the driving wheel 31 to drive the rear caster sleeve 42 to rotate and open, and rotating the handle 3 to fold will transmit the power to the driven wheel 422 through the driving wheel 31 to drive the rear caster sleeve 42 to rotate and fold. In this way, only by rotating the handle 3, the two sets of caster devices can be driven to rotate, open and fold, which is easy to operate.

[0034] The above-mentioned block 54 and the driven wheel 422 are an integrated structure. The driven wheel 422 is inserted into the rear end position of the rear caster sleeve 42 through the connecting block 423, and the center of the driven wheel 422 has a sleeve hole 4221 which is sleeved on the outside of the bracket 1 so that the driven wheel 422 can rotate along the bracket 1, which facilitates the disassembly and assembly of the driven wheel 422 components.

[0035] As an improvement to this embodiment, Figure 3-5 As shown, the rear ends of the two insertion rods 52 are provided with reinforcement seats 521, and the left and right ends of the second connecting rod 53 are respectively connected to the two reinforcement seats 521, and the front sides of the upper ends of the two reinforcement seats 52 are provided with insertion blocks 522. The handle 3 is provided with a first buckle groove 30 corresponding to the position of the insertion block 522. When the handle 3 is rotated to the open state, the insertion block 522 is inserted into the first buckle groove 30. At this time, the handle 3 cannot be rotated due to the obstruction of the insertion block 522, thereby locking the handle 3 in the open state.

[0036] Specifically, the handle 3 is provided with a connecting seat 32 on the left and right sides of its lower end, respectively. Two driving wheels 31 are located in front of the connecting seat 32 on the corresponding side, and a first locking groove 30 is provided on the rear side of the connecting seat 32. This facilitates assembly and disassembly of the driving wheels 31. Furthermore, each of the connecting seats 32 is provided with a rotating block 33, which is aligned with the driving wheels 31. The rotating block 33 and the driving wheels 31 are rotatably connected to the left and right sides of the fixed seat 51 on the corresponding side, respectively. This improves the rotational stability of the handle 3 and provides a more stable structure.

[0037] Example 3

[0038] This embodiment is a further improvement on the structure of the flatbed trolley of the second embodiment. The improvement is that Figure 3 、 6 As shown, the above-mentioned pulling mechanism has two, and the two pulling mechanisms are respectively located on the left and right sides of the bracket 1, wherein the pulling mechanism includes a slider 61 slidably arranged on the bracket 1, a tension spring 62 for pulling the slider 61 to slide forward, and a pull rope 63, the two ends of the pull rope 63 are respectively connected to the slider 61 and the reinforcement seat 521 on the corresponding side, and the two ends of the tension spring 62 are respectively connected to the bracket 1 and the slider 61. In the absence of external force, the tension spring 62 will pull the slider 61 forward through its own elastic force, and the forward sliding of the slider 61 will drive the pull rope 63 to pull the reinforcement seat 51 forward, and the reinforcement seat 51 will drive the insertion rod 52 to move forward at the same time, thereby realizing the structural function of the pulling mechanism to pull the insertion rod 52 forward.

[0039] like Figure 3 、 7 As shown, the above-mentioned slider 61 is located at the rear side of the front caster cover 41, and a protrusion 611 is provided at the front end of the slider 61. A second buckle groove 410 is provided at the rear side of the ring 7 of the front caster cover 41. When the front caster cover 41 is in the open state and without external force, the tension spring 62 will pull the protrusion 611 of the slider 61 into the second buckle groove 410, and at the same time, the pull rope 63 pulls the reinforcement seat 51 to drive the front end of the insertion rod 52 to be inserted into the slot of the rear caster cover 42. At this time, the front caster cover 41 cannot rotate due to the obstruction of the protrusion 611, and the rear caster cover 42 cannot rotate due to the obstruction of the insertion rod 52, thereby locking the front caster cover 41 and the rear caster cover 42 in the open state at the same time, and the locking is more stable.

[0040] like Figure 3 As shown, a silicone sleeve 531 is provided on the outer middle portion of the second connecting rod 53, so that the user can hold the silicone sleeve 531 with his hand to pull the second connecting rod 53 backward, making the operation more convenient and comfortable.

[0041] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A flatbed trolley, comprising a support (1), a load-bearing plate (2) and a handle (3) arranged on the support (1), and two sets of caster devices arranged on opposite sides of the support (1), wherein the caster device comprises a front caster sleeve (41) arranged at the front end of the support (1), a front caster (411) rotatably connected to the front caster sleeve (41), a rear caster sleeve (42) arranged at the rear end of the support (1), a rear caster (421) rotatably connected to the rear caster sleeve (42), and a first connecting rod (43) for connecting the front caster sleeve (41) and the rear caster sleeve (42), wherein each caster sleeve can be rotated, opened and folded relative to the support (1), and is characterized in that: The invention also includes a locking mechanism for locking the caster device in an open state, the locking mechanism including two fixing seats (51) provided on the bracket (1), two insertion rods (52), a second connecting rod (53) for connecting the two insertion rods (52), a pulling mechanism for pulling the insertion rods (52) to move forward, and stoppers (54) respectively provided on the two rear caster sleeves (42), the rear ends of the two rear caster sleeves (42) are provided with slots, the fixing seats (51) are located at the rear side of the rear caster sleeves (42), and the two fixing seats (51) are provided with slots penetrating the front and rear side walls thereof. The two insertion rods (52) are respectively inserted into the sliding holes (510) on the corresponding sides. When the rear caster cover (42) is rotated and folded, the stopper (54) will be driven to block the opening position of the sliding hole (510). At this time, the front end of the insertion rod (52) is placed at the rear side position of the corresponding stopper (54) in the sliding hole (510). When the rear caster cover (42) is rotated and opened, the stopper (54) and the opening position of the sliding hole (510) will be staggered. At this time, the pulling mechanism pulls the front end of the insertion rod (52) out of the sliding hole (510) and inserted into the slot of the rear caster cover (42).

2. The flatbed trolley according to claim 1, characterized in that: The handle (3) is rotatably connected to the bracket (1). The handle (3) can be rotated to open and fold relative to the bracket (1). The left and right sides of the lower end of the handle (3) are respectively provided with driving wheels (31). The two rear caster sleeves (42) are respectively provided with driven wheels (422). The teeth of the driving wheel (31) and the teeth of the driven wheel (422) are meshed with each other. When the handle (3) is rotated to open, the driving wheel (31) transmits the power to the driven wheel (422) to drive the rear caster sleeve (42) to rotate and open. When the handle (3) is rotated to fold, the driving wheel (31) transmits the power to the driven wheel (422) to drive the rear caster sleeve (42) to rotate and fold.

3. The flatbed trolley according to claim 2, characterized in that: The stopper (54) and the driven wheel (422) are an integrated structure, and the driven wheel (422) is inserted into the rear end of the rear caster sleeve (42) through the connecting block (423).

4. The flatbed trolley according to claim 2, characterized in that: The rear ends of the two insertion rods (52) are both provided with a reinforcement seat (521), and the two ends of the second connecting rod (53) are respectively connected to the two reinforcement seats (521). The two reinforcement seats (521) are both provided with an insertion block (522). The handle (3) is provided with a first buckle groove (30) at a position corresponding to the insertion block (522). When the handle (3) is rotated to an open state, the insertion block (522) is inserted into the first buckle groove (30).

5. The flatbed trolley according to claim 4, characterized in that: The left and right sides of the lower end of the handle (3) are respectively inserted with a connecting seat (32), the two driving wheels (31) are respectively arranged at the front side of the connecting seat (32) on the corresponding side, and the first buckle groove (30) is opened at the rear side of the connecting seat (32).

6. The flatbed trolley according to claim 5, characterized in that: The two connecting seats (32) are both provided with a rotating block (33), the rotating block (33) and the driving wheel (31) are aligned with each other, and the rotating block (33) and the driving wheel (31) are respectively connected to the left and right sides of the fixed seat (51) on the corresponding side for rotation.

7. The flatbed trolley according to claim 4, characterized in that: The pulling mechanism includes a slider (61) slidably arranged on the bracket (1), a tension spring (62) for pulling the slider (61) to slide forward, and a pull rope (63), the two ends of the pull rope (63) are respectively connected to the slider (61) and the reinforcement seat (521). In the absence of external force, the tension spring (62) will pull the slider (61) to slide forward and drive the pull rope (63) to pull the reinforcement seat (521) forward.

8. The flatbed trolley according to claim 7, characterized in that: The slider (61) is located at the rear side of the front caster cover (41), a protrusion (611) is provided at the front end of the slider (61), and a second buckle groove (410) is provided at the rear side of the front caster cover (41). When the front caster cover (41) is in an open state, the tension spring (62) pulls the protrusion (611) of the slider (61) to be inserted into the second buckle groove (410) of the front caster cover (41).

9. The flatbed trolley according to claim 1, characterized in that: The outer side of the second connecting rod (53) is sheathed with a silicone sleeve (531).

10. The flatbed trolley according to claim 1, characterized in that: The bracket (1) is a U-shaped tubular structure, and each caster sleeve is sleeved on the outside of the bracket (1) through a sleeve ring (7).

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