A flatbed handcart

Abstract

This invention belongs to the field of handcart technology, specifically a flatbed handcart. The invention includes a flatbed, a telescopic push-pull rod, and wheels. Wheels are installed near the four corners of the flatbed's underside, and are fixed to wheel bases by wheel brackets. A crossbar is installed on the front side wall of the flatbed using bolts and nuts, and the telescopic push-pull rod is hinged to the crossbar. Multiple interlocking T-shaped tenons and T-shaped grooves are provided on the left and right side walls of the flatbed. The T-shaped tenon of one flatbed inserts into the T-shaped groove of another flatbed, achieving a seamless lateral splicing between the two flatbeds. This invention enables the flatbed handcart to occupy little space when stored, making it easy to carry and transport; it facilitates quick disassembly and assembly, and has high connection stability, with the connection points capable of withstanding large loads; it has a wide range of applications and strong versatility, and can be effectively used in outdoor environments such as rugged mountain roads and potholed surfaces, as well as indoor environments such as thresholds and gaps.

Description

Technical Field

[0001] This invention belongs to the field of handcart technology, specifically a flatbed handcart. Background Technology

[0002] Flatbed handcarts are manual transport tools used for short-distance horizontal transport of goods. Due to their advantages such as simple structure, low cost, lightweight and labor-saving design, easy steering, and ability to operate in areas where motor vehicles are inconvenient, they hold an irreplaceable position in loading and unloading facilities and equipment, and are widely used in logistics warehouses, schools, hospitals, offices, homes, and other production and living environments. With technological advancements and increasing consumer demand, numerous inventions and innovations have emerged regarding handcarts, such as flatbed handcarts with foldable, height-adjustable, and reliable electric drive functions, as well as specialized handcarts for single items such as medical equipment and film and television equipment.

[0003] Existing flatbed handcarts are generally one-piece designs, with a relatively long flatbed and push-pull rod. Their volume is approximately the flatbed area multiplied by the push-pull rod length, resulting in a large space requirement when not in use. Even foldable models are difficult to carry and transport. Furthermore, existing flatbed handcarts have limited dimensional options, failing to adapt to the type and size of the goods being transported, and lacking consideration for special handling needs. While specialized handcarts can transport special goods, purchasing multiple models when there are many types of goods not only wastes resources but also fails to meet the needs of multi-tasking and multi-functionality. In addition, existing flatbed handcarts suffer from insufficient securing mechanisms. On one hand, the lack of securing devices requires manual support to prevent goods from falling during movement, especially when loading tall or irregularly shaped items such as pipes, making handling more difficult and affecting efficiency. On the other hand, existing modular flatbed carts typically only have one or two connecting devices, often with insufficient securing and connection strength. Especially when encountering ditches or bumps, the connecting parts are prone to deformation or loosening, affecting overall stability.

[0004] Utility model application CN201921357366.9 discloses a flatbed cart that can be spliced ​​and stacked. It includes a flatbed with a rectangular plate-like structure. Casters are installed at the bottom of the flatbed near the four corners. The outer walls of the flatbed extend outwards to form protruding edges. A first slot is vertically formed on the front protruding edge, a second slot is vertically formed on the right protruding edge, a first insert is vertically formed on the bottom surface of the left protruding edge, and a second insert is vertically formed on the bottom surface of the rear protruding edge. The thickness of the protruding edges is half the thickness of the flatbed. The front and right protruding edges are located on the lower half of the flatbed's side surface, while the rear and left protruding edges are located on the upper half of the flatbed's side surface. Four sets of wheel grooves are formed on the upper surface of the flatbed near the four corners. This utility model integrates splicing and stacking functions into one flatbed cart. It can be spliced ​​into a group of flatbed carts of a specified size according to the needs of goods, and can also be stacked when not in use, occupying little space. However, the flatbed trailer has poor fixation and stability, and is only connected by two slots and plugs, and lacks a device for securing goods; at the same time, the thickness of the convex edge is only half the thickness of the flatbed, and cannot play an actual supporting role. Summary of the Invention

[0005] The technical problem to be solved by this invention is that flatbed handcarts occupy a large space, are inconvenient to carry, have limited size and specifications, poor topology and applicability, are severely affected by terrain and environment, and have insufficient consideration for fixing conditions. The invention aims to make flatbed handcarts occupy a small space when stored, easy to carry and transport; easy to disassemble and assemble quickly, with high connection stability and the ability to withstand large loads at the connection points; and have a wide range of applications and strong versatility, and can be effectively used in outdoor environments such as rugged mountain roads and potholed roads, as well as indoor environments such as thresholds and gaps.

[0006] The technical solution adopted in this invention is as follows:

[0007] A flatbed handcart includes a flatbed, a telescopic push-pull rod, and wheels. The wheels are installed on the bottom surface of the flatbed near the four corners and are fixed to wheel bases by wheel brackets. A crossbar is installed on the front side wall of the flatbed by bolts and nuts, and the telescopic push-pull rod is hinged to the crossbar. The left and right side walls of the flatbed are respectively provided with multiple mutually cooperating T-shaped tenons and T-shaped mortises. The T-shaped tenon of one flatbed is inserted into the T-shaped mortis of another flatbed to achieve a seamless horizontal splicing between the two flatbeds.

[0008] The upper surface of the plate is provided with a wheel groove at the same position and with the same length and width as the wheel; the lower surface of the plate is provided with a groove for accommodating a telescopic push-pull rod.

[0009] The telescopic push-pull rod includes a handle, an inner rod, an outer rod, an angle adjuster, and a latch. The upper end of the inner rod is sleeved inside the outer rod, and the outer rod can move up and down along the inner rod. The lower end of the inner rod is hinged to the crossbar of the angle adjuster. A handle is provided at the upper end of the outer rod, and a latch is provided at the center of the handle.

[0010] The angle adjuster includes a fixed limiting ring, a rotating limiting ring, a spring II, a steel ball, a steel ball seat, and an adjusting block. The fixed limiting ring is fixedly connected to the crossbar. A limiting hole is provided on the outer surface of the fixed limiting ring. The rotating limiting ring is sleeved on the fixed limiting ring and is cast integrally with the inner rod. A telescopic mechanism is provided inside the inner rod. The telescopic mechanism cooperates with the limiting hole to realize the loosening and fixing of the rotating limiting ring. The adjusting block is provided at the other end of the telescopic mechanism. The adjusting block slides up and down along the upper and lower holes on the side wall of the inner rod to realize the adjustment and fixing of the angle.

[0011] The four corners of the flatbed and the rear sidewall are respectively provided with through splicing components, and any two flatbed handcarts can be spliced ​​and fixed in the horizontal and vertical directions through the through splicing components.

[0012] The through-type splicing assembly includes a square through pin, a square through hole, and a wedge lock on the flat plate. The square through pin is inserted and connected to the square through hole. A through sliding hole is provided on the lower side wall of the square through pin, and a through sliding track is provided in the middle. The sliding hole and the sliding track are connected, and the diameter of the sliding hole is larger than the diameter of the sliding track. The upper end of the sliding track facing the outside of the flat plate is provided with a sliding hole with a countersunk hole. After the square through pin is inserted into the square through hole, it is locked by the wedge lock.

[0013] The wedge lock includes a button, a spring I, a wedge, and a dovetail-shaped locking block. The spring I passes through the wedge, and one end of the spring I is connected to the button. The other end is provided with a dovetail-shaped locking block. The spring force causes the dovetail-shaped locking block to lock into the sliding hole with a countersunk hole.

[0014] The thickness of the square pin and square perforation is half the thickness of the overall plate to ensure flatness after mating.

[0015] The wheel bracket is rotatably connected to the wheel base via a bearing, and the other end of the wheel bracket is connected to the wheel via a bearing. The wheel is a triangular wheel.

[0016] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0017] (1) This invention can be used as a standard module alone, or several can be spliced ​​together as needed to meet the handling needs of goods of different shapes and tonnages. It has strong versatility and wide application range. The splicing components created by this invention are uniform, and any two or more can be combined in the horizontal and vertical directions. It has few limitations and can meet the application needs of multiple scenarios.

[0018] (2) This invention draws on the design of mortise and tenon structure, T-shaped tenons and T-shaped mortises, wedge locks, so that the flat plates are tightly combined and fixed together in a concave-convex and vertical combination to form a solid structure; and although some components are relatively thin, they can withstand huge pressure after being combined, and the load-bearing area will not be affected; in addition, the design of T-shaped tenons and T-shaped mortises can be used as binding posts, and can be used with ropes to fix goods, eliminating the need to hold the goods by hand, reducing the difficulty of handling and improving the practicality of the handcart.

[0019] (3) The telescopic push-pull rod of the present invention can be folded towards the flat plate through the angle adjuster. Unlike the traditional handcart, the telescopic push-pull rod of the present invention will be stored in the groove on the back of the flat plate, without occupying the front of the flat plate. This not only ensures that the front of the flat plate is beautiful and clean and has strong anti-slip properties, but also does not waste the space on the back of the flat plate when used as a transfer tray. When not in use, the present invention can be stacked together. The wheel groove on the front of the flat plate can not only play a stabilizing role and prevent it from falling over after stacking, but also accommodate part of the wheel height, reducing the space volume. If you want to further reduce the volume, you can also remove the wheel base to save storage or transportation space to the greatest extent.

[0020] (4) The wedge lock and angle adjuster designed in this invention have a simple structure, are easy to operate and convenient to use. They can be assembled and adjusted anytime and anywhere without the need for additional auxiliary tools. They are easy to disassemble, assemble and use quickly, and have strong applicability. They can be used for flood control and disaster relief, material distribution and fire emergency use.

[0021] (5) This invention is driven by human power, is low in cost, and can achieve the goal of energy conservation and environmental protection; at the same time, this invention is equipped with triangular wheels, which can easily cross thresholds and go up and down stairs, saving effort and making it convenient. The damping and shock absorption device on the wheel base of this invention can effectively buffer vibrations, thereby reducing damage to the handcart and avoiding impact on goods, and can adapt well to bad road surfaces.

[0022] Given the above-mentioned beneficial effects, this invention is expected to generate significant social and economic benefits after being put into the market, and its market prospects are extremely optimistic. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a modular flatbed handcart proposed in this invention.

[0025] Figure 2 This is a top view of a modular flatbed handcart proposed in this invention.

[0026] Figure 3 This is a bottom view of a modular flatbed handcart proposed in this invention.

[0027] Figure 4 This is a schematic diagram of the through-type splicing component structure of a modular flatbed handcart proposed in this invention.

[0028] Figure 5 This is a schematic diagram of the angle adjuster structure of a modular flatbed handcart proposed in this invention.

[0029] Figure 6 This is a schematic diagram of a modular flatbed handcart in its assembled state, as proposed in this invention.

[0030] In the diagram: 1. Flat plate; 2. Telescopic push-pull rod; 3. Wheel; 4. Wheel groove; 5. Crossbar; 6. T-shaped tenon; 7. T-shaped mortise; 8. Anti-slip protrusion; 9. Square pin; 10. Inner rod; 11. Outer rod; 12. Angle adjuster; 13. Lock; 14. Handle; 15. Square through hole; 16. Wedge lock; 17. Groove; 18. Wheel base; 19. Wheel bracket; 20. Sliding hole; 21. Slide rail 22. Sliding hole with recessed hole; 23. Button; 24. Spring I; 25. Wedge; 26. Locking cavity; 27. Slot; 28. Dovetail-shaped locking block; 29. ​​Locking hole; 30. Fixed limit ring; 31. Rotating limit ring; 32. Limiting hole; 33. Steel ball travel track; 34. Steel ball; 35. Steel ball holder; 36. Spring II; 37. Empty slot; 38. Adjusting block; 39. Upper hole; 40. Lower hole. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Example 1:

[0035] like Figure 1-6 As shown, the present invention provides a modular flatbed handcart, including a flatbed 1, a telescopic push-pull rod 2, and wheels 3, as follows. Figure 2 As shown, the wheels 3 are installed on the bottom surface of the plate 1 near the four corners, and the wheels 3 are fixed to the wheel base 18 by wheel brackets 19; a crossbar 5 is installed on the front side wall of the plate 1 by bolts and nuts, and the telescopic push-pull rod 2 is hinged to the crossbar 5.

[0036] Each flatbed handcart is a standard module that can be used individually, and several standard modules can be assembled together. The flatbed 1 is a rectangular plate, and the left and right side walls of the flatbed 1 are respectively provided with multiple symmetrical, identical, and mating T-shaped tenons 6 and T-shaped mortises 7, with the same thickness as the flatbed 1. The T-shaped tenons 6 and T-shaped mortises 7 are integrally cast with the flatbed 1, which not only ensures the strength of the left and right edges and side walls of the flatbed 1, but also reduces costs through mechanical integral molding.

[0037] When joining the two plates, the T-shaped tenon 6 of one plate 1 is inserted from top to bottom into the T-shaped mortise 7 of the other plate 1, achieving a seamless horizontal joint between the two plates 1 and limiting their horizontal movement. For example... Figure 6 As shown, the T-shaped tenon 6 can be used as a binding post, and can be used with sturdy hemp rope or nylon rope to bind goods.

[0038] Example 2:

[0039] The difference between this embodiment and Embodiment 1 is that:

[0040] like Figure 1-6 As shown, the upper surface of the flat plate 1 is provided with wheel grooves 4 at the same position and with the same length and width as the wheels 3. Multiple flat-type handcarts can be stacked together. The wheels 3 of the upper flat-type handcarts can be directly placed into the wheel grooves 4 of the lower flat-type handcarts. This not only plays a stabilizing role and prevents the stacked carts from falling over, but also accommodates part of the height of the wheels 3, reducing the space occupied after stacking.

[0041] The upper surface of the flat plate 1 is evenly provided with several circular anti-slip protrusions 8, which can increase the friction between the flat plates. The lower surface of the flat plate 1 is provided with a groove 17 for accommodating the telescopic push-pull rod 2, which not only effectively utilizes the space on the back of the flat plate 1, but also allows the flat trolley to be used directly as a transfer tray or flat plate when the telescopic push-pull rod 2 is retracted, thus improving usability.

[0042] Example 3:

[0043] The difference between this embodiment and the above embodiments is that:

[0044] like Figure 1-6 As shown, the telescopic push-pull rod 2 includes a handle 14, an inner rod 10, an outer rod 11, an angle adjuster 12, and a latch 13. The upper end of the inner rod 10 is sleeved inside the outer rod 11, and the outer rod 11 can move up and down along the inner rod 10. The lower end of the inner rod 10 is fixed to the crossbar 5 via the angle adjuster 12. A handle 14 is provided at the upper end of the outer rod 11. The handle 14 is a crossbar with rubber sleeves on both sides to increase the friction of the handle 14. A latch 13 is provided at the center of the handle 14, and the latch 13 has a locking device to lock the telescopic length of the outer rod 11.

[0045] The angle adjuster 12 includes a fixed limit ring 30, a rotating limit ring 31, a spring 36, a steel ball 34, a steel ball seat 35, and an adjusting block 38, which can adjust the angle of the telescopic push-pull rod 2 within the range of 0 to 270°.

[0046] The fixed limiting ring 30 is fixedly connected to the crossbar 5 and cannot rotate. The outer surface of the fixed limiting ring 30 has four limiting holes 32, located at angles of 0°, 45°, 90°, and -180° respectively. These holes allow the telescopic push-pull rod 2 to be perpendicular, tilted at 45°, or parallel to the plate 1, or to fold towards the opposite side of the plate 1 and be stored in the groove 17 on the opposite side of the plate 1. A ball bearing track 33 is provided between the limiting holes 32.

[0047] The rotating limiting ring 31 is sleeved on the fixed limiting ring 30, and the rotating limiting ring 31 and the inner rod 10 are cast as one piece. A slot 37 is provided at the connection between the inner rod 10 and the rotating limiting ring 31. A steel ball 34 is placed at the opening of the slot via a steel ball holder 35. The diameter of the steel ball 34 is larger than the diameter of the slot opening. A spring II 36 is provided inside the inner rod 10. The steel ball 34 is connected to the spring II 36 within the slot. An adjusting block 38 is provided on the other side of the spring II 36. The adjusting block 38 can slide up and down along the upper hole 39 and lower hole 40 on the side wall of the inner rod 10. When the adjusting block 38 is fixed in the lower hole 40, the spring II 36 presses the steel ball 34 outwards onto the steel ball travel track 33 of the fixed limiting ring 30. When the rotating limiting ring 31 rotates on the fixed limiting ring 30, the steel ball 34 passes through the limiting hole 32 and falls into the limiting hole 32, thus fixing the rotating limiting ring 31 and the fixed limiting ring 30, thereby fixing the angle of the telescopic push-pull rod 2. To adjust the angle, the adjusting block 38 can be slid to the upper hole 39 to reduce the pressure of the spring II 36 on the steel ball 34, and a little force can be applied to make the steel ball 34 slide out of the limiting hole 32. After the steel ball 34 slides out of the limiting hole 32, the adjusting block 38 can be slid back to the lower hole 40, and the spring II 36 will continue to compress the steel ball 34 to travel on the steel ball travel track 33 until it is pressed into the next limiting hole 32.

[0048] Example 4:

[0049] The difference between this embodiment and the above embodiments is that:

[0050] like Figure 1-6 As shown, the rear side wall of the flat plate 1 is provided with a base, a square pin 9, a square hole 15, and a wedge lock 16. The base, square pin 9, square hole 15, and wedge lock 16 constitute a through-type splicing component, which adopts the mortise and tenon through-type splicing method to realize the splicing and fixing of flat-plate handcarts. The base, square pin 9, and square hole 15 are integrally cast with the flat plate 1. The thickness of the base, square pin 9, and square hole 15 is half that of the flat plate 1. The square pin 9 is located on the back of the flat plate 1, and the square hole 15 is located on the front of the flat plate 1. The square pin 9 is located at one of the two corners of the T-shaped tenon 6, and the square hole 15 is located at one of the two corners of the T-shaped mortise 7. The shape and size of the square pin 9 are the same as those of the square hole 15, both being rectangular. When the plates are spliced ​​together, the square pin 9 can be inserted into the square hole 15 from top to bottom, so that the two plates can be interlocked and spliced ​​together. The thickness of the spliced ​​plates is consistent with the thickness of the overall plates, and the joint is flat. This not only ensures the smoothness of the surface of the plate 1, but also ensures that the overall load-bearing capacity of the plates is the same.

[0051] The square pin 9 has a through-hole 20 on its lower sidewall and a through-track 21 in its middle. The through-hole 20 and the track 21 are connected, and the diameter of the through-hole 20 is larger than the diameter of the track 21. The square pin 9 has a through-hole 22 with a recessed hole on the upper end of the track 21 facing the outside of the plate 1, but no through-hole 22 on the other side.

[0052] The wedge lock 16 is located on the square through hole 15 and includes a button 23, a spring 124, a wedge 25, and a lock cavity 26 for fixing and accommodating these components. The button 23 is located on the side wall of the square through hole 15 facing the outer side of the plate 1 and is connected to the wedge 25, with the spring 124 passing through the connection. A dovetail-shaped locking block 28 is provided at the tip of the other end of the wedge 25. The dovetail-shaped locking block 28 has the same shape and size as the sliding hole 20 and the sliding hole 22 with a countersunk hole on the square through pin 9. The body of the wedge 25 has the same shape and width as the slide 21 on the square through pin 9. The lock cavity 26 penetrates the base where the square through hole 15 is located and has a groove 27 that mates with the dovetail-shaped locking block 28. A hole is provided on the side of the square through hole 15 near the plate 1. A lock hole 29 of the same size and position as the groove 27 is provided on the partition between the hole and the square through hole 15. When not in use, spring I24 is relaxed, and the dovetail-shaped locking block 28 is positioned within the slot 27. When assembling the flat plates, the square through pin 9 is inserted into the square through hole 15 from top to bottom. When the sliding hole 20 at the lower end of the square through pin 9 coincides with the slot 27 on the square through hole 15, pressing button 23 compresses spring I24, pushing the dovetail-shaped locking block 28 on the wedge 25 through the sliding hole 20 at the lower end of the square through pin 9 and the locking hole 29 on the partition. As the square through pin 9 continues to be inserted downwards into the square through hole 15... Hole 15, the wedge 25 slides along the slide 21 on the square pin 9. When the square pin 9 and the square hole 15 are fully engaged, the wedge 25 slides to the upper end of the slide 21 with a recessed hole 22. When the button 23 is released, the spring 124 rebounds, and the dovetail-shaped locking block 28 is inserted into the recessed hole 22 on the square pin 9, thereby locking the square pin 9 and the square hole 15, thus restricting the vertical displacement between the plates.

[0053] The four corners and rear sidewall of the flat plate 1 are respectively equipped with through-type splicing components, allowing any two modular flat-plate handcarts to be spliced ​​and fixed horizontally and vertically via these components. Multiple square pins 9 can be provided at the two corners of the flat plate on the side containing the T-shaped tenon 6, and multiple identical square holes 15 can be provided at the two corners of the flat plate on the side containing the T-shaped tenon 7. The square pins 9 and square holes 15 cooperate to achieve horizontal splicing of the flat plates. Multiple through-type splicing components can be provided on the rear wall of the flat plate 1, arranged in the order of one square pin 9, one square hole 15, one square pin 9, and one square hole 15, with the number of square pins 9 being the same as the number of square holes 15. Vertical seamless splicing is achieved between the flat plates via the through-type splicing components on the rear wall.

[0054] The wheel bracket 19 is rotatably connected to the wheel base 18 via bearings. The wheel base 18 is fixed to the flat plate 1 with screws and bolts. A damping and shock absorption device is provided between the wheel base 18 and the flat plate 1 to alleviate vibrations generated during use. To further reduce the space occupied by the modular flatbed trolley after storage, the wheel base 18 should be easily removable and then reinstalled when in use.

[0055] The other end of the wheel bracket 19 is rotatably connected to the wheel 3 via a pivot. The wheel 3 is a triangular wheel, using the common 90mm triangular wheel on the market, made of EVA foam material to avoid using conductive metal wheels. All three wheels are the same size, effectively enabling crossing thresholds and going up and down stairs.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flatbed trolley characterised by, Including flat plate (1), telescopic push-pull rod (2), wheel (3), the lower bottom surface of the flat plate (1) is close to the four corners and is provided with the wheel (3), the wheel (3) is fixed on the wheel base (18) through the wheel support (19);The front side wall of the flat plate (1) is provided with a crossbar (5) by bolt and nut, and the telescopic push-pull rod (2) is hingedly installed on the crossbar (5);The left and right side walls of the flat plate (1) are respectively provided with a plurality of T-shaped tenons (6) and T-shaped mortises (7) connected with each other, the T-shaped tenon (6) of one flat plate (1) is inserted into the T-shaped mortise (7) of another flat plate (1), and seamless splicing between two flat plates (1) in the horizontal direction is realized; The four corners and the rear side wall of the flat plate (1) are respectively provided with a through splicing assembly, and any two flat plate trolleys are spliced and fixed in the horizontal direction and the vertical direction through the through splicing assembly; The through splicing assembly comprises a square pin (9), a square hole (15) and a wedge lock (16) arranged on the flat plate (1), the square pin (9) is inserted into the square hole (15) in a matched manner, a sliding hole (20) is arranged on the lower end side wall of the square pin (9), a sliding groove (21) is arranged on the middle part, the sliding hole (20) is in communication with the sliding groove (21), the hole diameter of the sliding hole (20) is greater than the hole diameter of the sliding groove (21), a sliding hole (22) with a counterbore is arranged on the upper end of the sliding groove (21) of the square pin (9) facing the outer side of the flat plate (1), and the square pin (9) is locked through the wedge lock (16) after being inserted into the square hole (15). The wedge lock (16) comprises a button (23), a spring I (24), a wedge (25) and a dovetail type clamping block (28), the spring I (24) is arranged on the wedge (25), one end of the spring I (24) is connected with the button (23), and the other end is provided with the dovetail type clamping block (28), and the dovetail type clamping block (28) is clamped in the sliding hole (22) with a counterbore through the spring force. The thickness of the square pin (9) and the square hole (15) is half of the thickness of the whole flat plate (1), so that the flatness after cooperation is ensured.

2. A flatbed trolley as claimed in claim 1, wherein: A wheel groove (4) with the same position, the same length and width as the wheel (3) is arranged on the upper plane of the flat plate (1), and a recess (17) for accommodating the telescopic push-pull rod (2) is arranged on the lower plane of the flat plate (1).

3. A flatbed trolley as claimed in claim 2, wherein: The telescopic push-pull rod (2) comprises a handle (14), an inner rod (10), an outer rod (11), an angle adjuster (12) and a lock catch (13), the upper end of the inner rod (10) is sleeved in the outer rod (11), the outer rod (11) can move up and down along the inner rod (10), the lower end of the inner rod (10) is hingedly connected with the crossbar (5) through the angle adjuster (12), the upper end of the outer rod (11) is provided with the handle (14), and the center of the handle (14) is provided with the lock catch (13).

4. A flatbed trolley as claimed in claim 3, wherein: The angle adjuster (12) comprises a fixed limiting ring (30), a rotating limiting ring (31), a spring II (36), a steel ball (34), a steel ball seat (35), and an adjusting block (38). The fixed limiting ring (30) is fixedly connected to the horizontal rod (5). The outer surface of the fixed limiting ring (30) is provided with a limiting hole (32). The rotating limiting ring (31) is sleeved on the fixed limiting ring (30), and the rotating limiting ring (31) is integrally formed with the inner rod (10). The inner rod (10) is internally provided with a telescopic mechanism which cooperates with the limiting hole (32) to loosen and fix the rotating limiting ring (31). The other end of the telescopic mechanism is provided with the adjusting block (38). The adjusting block (38) slides up and down along the upper hole (39) and the lower hole (40) on the side wall of the inner rod (10) to adjust and fix the angle.

5. A flatbed cart according to claim 1, wherein: The wheel support (19) is rotatably connected to the wheel base (18) through a bearing. The other end of the wheel support (19) is connected to the wheel (3) through a bearing. The wheel (3) is a triangular wheel.

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