Novel manned foldable electric trailer

Abstract

Novel manned foldable electric trailer, characterized in that it comprises: a foldable body which is foldable longitudinally between the front and rear ends, wherein a seat arrangement is provided on the upper side of the front end of the foldable body, a steering rod arrangement is connected to the underside of the front end of the foldable body which is connected to at least one first wheel, and wherein at least two second wheels are provided at an end of the foldable body which is away from the steering rod arrangement, and wherein the foldable body further comprises a power supply for providing electrical energy to the first wheel and / or the second wheels and a control unit for controlling the operation of the first wheel and / or the second wheels;wherein the foldable carriage body comprises a first shelf and a second shelf, wherein one end of the first shelf is connected to one end of the second shelf, wherein a support arrangement is provided on each of the two sides of the first shelf, and wherein the two ends of each support arrangement are each connected to a support component, and wherein when the first shelf and the second shelf fold each other together, they can drive the support arrangements on both sides simultaneously as they fold.

Description

TECHNICAL AREA The present invention relates to the technical field of folding trailers, in particular a novel manned folding electric trailer. STATE OF THE ART A folding trailer is a collapsible and pullable cargo box trailer. Due to its ease of use, loading capacity, simple storage, and time and labor savings, it is widely used for transporting goods and is frequently employed today for outdoor activities or short-distance transport. Traditional trailers must be pulled manually, which is time-consuming and strenuous, especially when transporting goods uphill. Therefore, the prior art has also developed an auxiliary drive trailer – patent number CN202220922980.0. By arranging electric wheels and a control unit on the trailer body, an electric auxiliary drive is achieved when attaching, thus improving the effort required and the ease of use of the trailer. However, this concept has significant drawbacks. Although it saves some effort, manual pulling by a person from the front is still necessary. While this method of propulsion can reduce the pulling force required by the user, such a trailer is not designed for passenger transport due to its inherent limitations.As a result, the user is forced to walk, which quickly leads to fatigue and thus impairs the overall experience. Therefore, there is an urgent need to develop a novel manned foldable electric trailer to overcome one or more of the aforementioned disadvantages of the state of the art. CONTENT OF THE PRESENT APPLICATION To solve the aforementioned problem, the present invention provides the following technical solution: A novel manned foldable electric trailer comprising: a foldable vehicle body that can be folded longitudinally between the front and rear ends, wherein a seat arrangement is provided on the upper side of the front end of the foldable vehicle body, a steering rod arrangement is connected to the underside of the front end of the foldable vehicle body, which is connected to at least one first wheel, and wherein at least two second wheels are provided at an end of the foldable vehicle body that is away from the steering rod arrangement, and wherein the foldable vehicle body further comprises a power supply for providing electrical energy to the first wheel and / or the second wheels, as well as a control unit for controlling the operation of the first wheel and / or the second wheels;wherein the foldable carriage body comprises a first shelf and a second shelf, wherein one end of the first shelf is connected to one end of the second shelf, wherein a support arrangement is provided on each of the two sides of the first shelf, and wherein the two ends of each support arrangement are each connected to a support component, and wherein when the first shelf and the second shelf fold each other together, they can drive the support arrangements on both sides simultaneously as they fold. In a preferred embodiment, a telescopic inner rod is slidably arranged on each side of one end of the first shelf, wherein the telescopic inner rod can be extended out of the first shelf in order to move the steering rod assembly away from the first shelf. In a preferred embodiment, the steering rod assembly comprises a steering crossbar and a steering rod, wherein the first wheel is arranged below the steering crossbar, and a folding lever is inserted through the middle of the steering crossbar, which is rotatable horizontally relative to the steering crossbar, wherein the lower part of the folding lever is connected to the first wheel, and the steering rod drives the steering of the first wheel via the folding lever. In a preferred embodiment, the steering rod arrangement further comprises a sleeve rod, wherein one end of the sleeve rod is rotatably connected to the upper end of the folding lever, the steering rod is slidably arranged in the sleeve rod, and wherein the steering crossbar is rotatably connected to the telescopic inner rod. In a preferred embodiment, a support frame is connected between the two support components at the same ends of each of the two support arrangements, and a horizontal transition rod is connected to each of the upper ends of each of the two ends of each support arrangement, and the upper ends of each of the two ends of the support arrangement are connected to the support component via the transition rod. In a preferred embodiment, the number of first wheels is two, wherein the two first wheels are arranged at both ends of the steering crossbar, wherein a steering connecting rod is movably connected to one end of the folding lever that is away from the steering rod, wherein the two ends of the steering connecting rod are rotatably connected to the two first wheels. In a preferred embodiment, a vertical first sliding groove is provided at the lower ends of each of the two support components adjacent to the steering rod assembly, wherein a tread surface is arranged between the two first sliding grooves, wherein a first sliding axis is provided on each side of the lower end of the tread surface, and wherein the lower end of the tread surface is slidably connected to the first sliding groove via the first sliding axis. In a preferred embodiment, at least one folding limiting pin is provided in the lower end of the underside of the tread surface, which serves to limit the horizontal displacement of the steering rod assembly in the folded state of the tread surface, wherein at least one pin hole corresponding to the folding limiting pin is provided on the upper side of the steering crossbar, and wherein a recess corresponding to the folding lever is provided in the middle of the upper end of the tread surface. In a preferred embodiment, at least one folding limit pin is provided in the upper end of the underside of the tread surface, which serves to limit the horizontal displacement of the steering rod assembly in the unfolded state of the tread surface, wherein the folding limit pin corresponds to the pin hole. In a preferred embodiment, spaced-apart hinge connecting tabs are provided at the upper end of the hinge lever, wherein a plug-in opening is provided between the two hinge connecting tabs, wherein a projection is provided at the lower end of the sleeve rod, which is inserted between the two hinge connecting tabs and rotatably connected via a pivot axis, wherein a folding limiting element is movably arranged in the lower end of the sleeve rod, wherein when the steering rod presses the folding limiting element, one end of the folding limiting element protrudes from the projection and is inserted into the plug-in opening, thereby limiting a rotation of the sleeve rod relative to the hinge lever. In a preferred embodiment, a handle ring is provided at the upper end of the steering rod, wherein a folding groove is provided on each side of the handle ring, wherein a handle lever is rotatably connected to each of the two folding grooves, and wherein one of the two handle levers is electrically connected to the control unit in order to control the running speed of the first wheel and / or the second wheel. In a preferred embodiment, corresponding limiting holes are provided on the side wall of the steering rod and the side wall of the sleeve rod, wherein a limiting pawl pin is further arranged in the steering rod, which corresponds to the limiting holes, wherein a pawl pin button is provided in the lower end of the handle ring, which drives the limiting pawl pin to extend or retract. In a preferred embodiment, a braking device is also provided on the steering crossbar, which is connected to the first wheel. In a preferred embodiment, a folding limiting sleeve is slid over at each pivot point between the respective telescopic inner rod and the steering crossbar, wherein a sleeve return spring is provided at the end of the folding limiting sleeve facing the steering crossbar, and wherein the folding limiting sleeve is arranged in the joint between the telescopic inner rod and the steering crossbar under the action of the sleeve return spring. In a preferred embodiment, the seat arrangement is made of a rigid material, wherein both ends of the seat arrangement are rotatably connected to the two sides of the front top of the foldable cart body, and wherein the seat arrangement can be folded forward or backward relative to the foldable cart body. In a preferred embodiment, the seating arrangement is made of a flexible material, wherein the seating arrangement is arranged in the front upper part of the foldable cart body, and wherein at least one support rod connected to the foldable cart body is provided at the front and / or rear of the seating arrangement. In a preferred embodiment, the end of the telescopic inner rod facing away from the second shelf is rotatably connected to the steering rod assembly. The present invention offers the following advantages: The aforementioned design incorporates a passenger transport function by arranging a seat at the top of the front end of the foldable trailer body, thereby making the use of the electric trailer more energy-efficient. Simultaneously, the steering rod assembly is slidably connected to the foldable trailer body, allowing it to be extended. This increases the distance between the support point of the seat assembly and the support point of the first wheel, thus enhancing stability and safety while traveling with a passenger. Furthermore, a footplate is provided at the front end of the foldable trailer body, facilitating foot rest and standing while traveling, and thus expanding the versatility of the electric trailer. Additionally, the electric trailer can be folded for storage, improving its portability. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a schematic representation of the structure of the present invention; Fig. 2 shows an exploded view of a foldable cart body of the present invention; Fig. 3 shows a schematic representation of the structure of a running surface of the present invention; Fig. 4 shows a schematic representation of the structure of a steering rod assembly of the present invention; Fig. 5 shows a schematic representation of the structure of a steering rod of the present invention; Fig. 6 shows a cross-sectional view of a folding limiting element of the present invention; Fig. 7 shows a schematic representation of transport operating state I of the present invention; Fig. 8 shows a schematic representation of transport operating state II of the present invention; Fig. 9 shows a schematic representation of the folded state of the present invention; Fig. 10 shows a circuit diagram of the control unit of the present invention; Fig.Figure 11 shows a block diagram of the electrical connection of the present invention. Reference symbol list: 1-Folding cart body; 11-First shelf; 12-Second shelf; 13-Support assembly; 131-Support frame; 132-Transition stem; 133-First sliding groove; 134-Second sliding groove; 14-Support component; 15-Second wheel; 16-Power supply; 17-Control unit; 18-Telescopic inner rod; 2-Steering rod assembly; 21-Steering crossbar; 211-Articulation lever; 212-Steering connecting rod; 213-Pin hole; 214-Articulation connecting tab; 215-Plug opening; 216-Brake device; 217-Folding stop sleeve; 218-Guide pin; 219-Extension block; 22-Steering rod; 221-Handle ring; 222-Folding groove; 223-Handle lever; 224-Limiting device; 225-Control button; 226-Display device; 227-Limiting hole; 228-Limiting pawl pin; 229-Pank pin button; 23-Sleeve rod; 231-Protrusion; 232-Folding limiting element; 233-Folding limiting return spring; 234-Pivot axis sliding hole; 24-First wheel; 3-Tread surface; 31-First sliding axis; 32-Second sliding axis; 33-Folding limiting pin; 34-Unfolding limiting pin; 35-Recess; 4-Seat arrangement. DETAILED DESCRIPTION To clarify and explain the above objectives, features, and advantages of the invention, the specific embodiments of the invention are described in detail below with reference to the accompanying drawings. Numerous specific details are explained in the following description to facilitate a comprehensive understanding of the present invention. However, the invention can be implemented in numerous other embodiments that differ from the variants described here. Those skilled in the art can make corresponding modifications while maintaining the inventive concept. Therefore, the invention is not subject to the limitations of the specific embodiments disclosed below. The description of the invention clarifies that the terms "connecting" and "assembling" are to be understood in the broadest sense unless expressly defined and limited. For example, "connecting" can refer to a detachable or non-detachable connection; it can refer to a direct connection or an indirect connection via an intermediate medium. Furthermore, "being connected" can mean a direct connection or an indirect connection via an intermediate medium. Additionally, "fixing" means that the connected parts are mutually connected and their relative positions remain unchanged after the connection. The directional terms used in the embodiments of this invention, such as "inside," "outside," "top," "bottom," etc., refer exclusively to the orientation shown in the accompanying drawings.These terms serve to better and more clearly explain and understand the embodiments and are not to be understood as an indication or suggestion that the devices or elements mentioned must have a specific orientation, be specifically designed, or be operated in a particular way. Therefore, these directional indications are not to be understood as limiting the embodiments of this invention. In the embodiments of the present invention, the terms "first" and "second" serve purely descriptive purposes and should not be interpreted as indicating or implying relative importance or as an implicit indication of the number of the designated technical features. Therefore, a feature defined as "first" or "second" may expressly or implicitly include one or more such features. In the embodiments of the present invention, the term "and / or" merely describes the relationship between the objects connected therein and indicates three types of relationships. For example, "A and / or B" can represent the following three cases: A alone, A and B together, or B alone. Furthermore, the symbol " / " in this document generally denotes an "or" relationship between the linked objects. In this description, references to "one embodiment" or "some embodiments," etc., mean that the specific features, structures, or properties described in connection with that embodiment are included in one or more embodiments of the present invention. Accordingly, phrases appearing in various sections of this description, such as "in one embodiment," "in some embodiments," "in other embodiments," and "in further embodiments," etc., do not necessarily refer to the same embodiment. Instead, they mean "one or more, but not all, embodiments," unless this is additionally and specifically emphasized. The terms "comprise," "include," "have," and their variants all mean "including, but not limited to," unless this is additionally and specifically emphasized in another way.Therefore, the present invention is not limited to the specific embodiments disclosed below. As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig.As shown in Figure 11, this invention provides a novel manned foldable electric trailer comprising: a foldable vehicle body 1, which is foldable longitudinally between the front and rear ends, wherein a seat arrangement 4 is provided at the top of the front end of the foldable vehicle body 1, a steering rod arrangement 2 is connected to the underside of the front end of the foldable vehicle body 1, which is connected to at least one first wheel 24, and wherein at least two second wheels 15 are provided at an end of the foldable vehicle body 1 that is away from the steering rod arrangement 2, and wherein the foldable vehicle body 1 further comprises a power supply 16 for providing electrical energy to the first wheel 24 and / or the second wheels 15 and a control unit 17 for controlling the operation of the first wheel 24 and / or the second wheels 15. In particular, the foldable cart body 1 is designed as a longitudinally foldable trailer. A seat assembly 4 is rotatably mounted at the front upper end of the foldable cart body 1, enabling the user to sit on it. The steering rod assembly 2 is connected to the lower part of the foldable cart body 1, and at least one first wheel 24 is provided at the lower end of the steering rod assembly 2. On both sides of the end of the foldable cart body 1 opposite the steering rod assembly 2, a second wheel 15 is rigidly connected to the foldable cart body 1. A stable triangular structure is formed between the first wheel 24 and the second wheels 15 to ensure that the foldable cart body 1 remains stable even when loaded and to reduce the likelihood of tipping over.Preferably, in the present embodiment, the first wheel 24 is movably arranged so that it can rotate to control the direction of travel, while the second wheels 15 are fixed and non-rotatable to prevent uncontrolled steering during travel. At the front end of the foldable cart body 1, a control unit 17 for controlling the operation of the first wheel 24 and / or the second wheels 15, as well as a power supply 16 for providing electrical energy to the first wheel 24 and / or the second wheels 15, are also provided. This allows the first wheel 24 and / or the second wheels 15 to rotate independently under the control of the control unit 17 and drive the foldable cart body 1, thus achieving an electric drive effect. Simultaneously, the steering rod assembly 2 serves to control the steering of the first wheel 24, enabling the user to sit on the seat assembly 4 to perform a passenger transport function.This means that the foldable trailer no longer requires manual pulling during use, which improves usability and reduces the user's workload. It should be noted that both the first wheel 24 and the second wheels 15 can be configured as driven drive wheels, or a choice can be made between the first wheel 24 and the second wheels 15 to serve as the drive wheel, depending on the actual requirements. In the present embodiment, it is preferred to use the first wheel 24 as the drive wheel because it is located at the same end as the steering rod assembly 2, which simplifies and shortens the wiring. At the same time, the front-wheel drive configuration allows for better traversing of uneven roads, such as when driving over curbs, and exhibits higher permeability. Furthermore, the front-wheel drive configuration offers greater traction and better driving performance under high loads. The drive wheels are electric wheels with an integrated motor, representing the state of the art, as known, for example, from e-bikes or electric motorcycles. Therefore, a detailed description of the structure of the electric wheels will not be discussed here. Furthermore, the foldable cart body 1 comprises a first shelf 11 and a second shelf 12. One end of the first shelf 11 is connected to one end of the second shelf 12. A support assembly 13 is provided on each of the two sides of the first shelf 11. A support component 14 is connected to each end of the support assembly 13 on each side. A telescopic inner rod 18 is slidably arranged in each end of the first shelf 11. The end of the telescopic inner rod 18 facing away from the second shelf 12 is rotatably connected to the steering rod assembly 2. The telescopic inner rod 18 can be extended from the first shelf 11 to move the steering rod assembly 2 away from the first shelf 11. In particular, the foldable cart body 1 comprises a first shelf 11, a second shelf 12, a support assembly 13, and a support component 14. There are four support components 14, arranged in a rectangular shape. Both the first shelf 11 and the second shelf 12 are located within the rectangle bounded by the support component 14, and one end of each is connected. The two sides of the ends of the first shelf 11 and the second shelf 12, facing away from each other, are each rotatably connected to the corresponding support component 14. Simultaneously, a support assembly 13 is connected between the two support components 14 on the same side. The support assembly 13 has an X-shaped structure, allowing it to fold inwards when pressure is applied to both ends.This allows the support assemblies 13 on both sides to be folded simultaneously when the first shelf 11 and the second shelf 12 are folded together. When the support assembly 13 is unfolded, it can help to distribute the force of gravity acting on the first shelf 11 and the second shelf 12. Preferably, the first shelf 11 and the second shelf 12 have a hollow structure to reduce the overall weight of the foldable carriage body 1. A telescopic inner rod 18 is slidably arranged in each of the two sides of the end of the first shelf 11 facing away from the second shelf 12. The length of the telescopic inner rod 18 is shorter than the length of the first shelf 11. The telescopic inner rod 18 can be partially extended out of the first shelf 11 if necessary. The front end of the telescopic inner rod 18 is rotatably connected to the steering rod assembly 2.The telescopic inner rod 18 can be rotated vertically relative to the steering rod assembly 2, so that when the first shelf 11 and the second shelf 12 fold relative to each other, they can take the telescopic inner rod 18 with them and fold it together relative to the steering rod assembly 2. Simultaneously, when extending, the telescopic inner rod 18 can move the steering rod assembly 2 and the first wheel 24 away from the first shelf 11. The maximum extension of the telescopic inner rod 18 is less than its own length, in order to enable the folding cart body 1 to be raised through its interaction with the first shelf 11. This provides the user with improved support when seated on the seat assembly 4. It should be noted that inside the foldable trolley body 1 a carrying bag (not shown in the drawings) is also provided, which serves to enclose the items located in the foldable trolley body and to prevent them from falling out. Furthermore, an opening is provided on the underside of a connecting end of the first shelf 11 with the second shelf 12, and the end of the second shelf 12 adjacent to the first shelf 11 is partially inserted into the first shelf 11 and rotatably connected to the first shelf 11; in particular, an opening is provided in the underside of the end of the first shelf 11 connected to the second shelf 12 (not shown), the length of which is less than half the length of the first shelf 11. One end of the second shelf 12 is inserted into the end of the first shelf 11 with the opening, the insertion depth being less than the length of the opening to prevent the first shelf 11 and the second shelf 12 from being folded relative to each other.At the same time, the structure of the opening in the underside can prevent the first shelf 11 and the second shelf 12 from sagging due to the load and improve the load-bearing capacity of the first shelf 11 and the second shelf 12. Furthermore, a support frame 131 is connected between each of the two support components 14 at the same ends of the two support assemblies 13. A horizontal transition leg 132 is connected to the upper ends of each end of the support assembly 13, with the upper ends of each end of the support assembly 13 being connected to the support component 14 via the transition leg 132. In particular, to improve the overall stability of the foldable carriage body 1, support frames 131 are provided between each of the two front support components 14 and between each of the two rear support components 14. The support frames 131 can have a straight shape, an X-shape, or another suitable shape. The arrangement of the support frames 131 effectively prevents the two support components 14 from tipping towards the center at the same end.Simultaneously, the support frames 131 can also serve to support the seating arrangement 4 and distribute the weight force acting when transporting persons. Since the support arrangement 13 also has an "X"-shaped structure, its height increases at both ends when folded. At the same time, the two ends of the support arrangement 13 are connected to the support components 14. To avoid a conflict of movement that would prevent the support arrangement 13 from folding, the usual choice would be to design the support components 14 as a telescopic structure. However, the use of a telescopic structure slightly compromises the stability of the support components 14.In the present embodiment, it is therefore preferred to rotatably connect a horizontal transition stem 132 to each of the upper ends of the two ends of the support arrangement 13, with the other end of the transition stem 132 rotatably connected to the upper end of the corresponding support component 14. Since the movement of the lower end of the support arrangement 13 is restricted, the folding of the support arrangement 13 is achieved by a movement of the upper end. Thus, the arrangement of the transition stems 132 at the upper ends of the two ends of the support arrangement 13 is sufficient to enable the folding of the support arrangement 13 without the need for the support component 14 to be designed as a telescopic structure. At the same time, due to its horizontal arrangement, the transition stem 132 can also serve to support the seating arrangement 4. It should be noted that the length of the transition stem 132 must be adapted to the movement path of the upper end of the support arrangement 13, otherwise the unfolding or folding of the support arrangement 13 would be impaired. Furthermore, in the present embodiment, the steering rod assembly 2 comprises a steering crossbar 21, a steering rod 22, and a sleeve rod 23. The first wheel 24 is arranged below the steering crossbar 21. A hinged lever 211 is inserted through the center of the steering crossbar 21, and the hinged lever 211 can rotate horizontally relative to the steering crossbar 21. One end of the sleeve rod 23 is rotatably connected to the upper end of the hinged lever 211. The steering rod 22 is slidably arranged in the sleeve rod 23. The steering crossbar 21 is rotatably connected to the telescopic inner rod 18. The lower end of the hinged lever 211 is connected to the first wheel 24. The steering rod 22 can move the first wheel 24 for steering via the hinged lever 211. In particular, the steering rod assembly 2 comprises a steering crossbar 21, a steering rod 22, and a sleeve rod 23. The two ends of the steering crossbar 21 are each rotatably connected to the telescopic inner rod 18. The first wheel 24 is arranged at the two end sections of the steering crossbar 21. A hinged lever 211 is rotatably provided in the middle of the steering crossbar 21, and the hinged lever 211 can rotate horizontally relative to the steering crossbar 21. The lower end of the hinged lever 211 is connected to the first wheel 24, and the rotation of the first wheel 24 is controlled by the hinged lever 211. The sleeve rod 23 is rotatably connected to the upper end of the hinged lever 211. The steering rod 22 is slidably arranged in the sleeve rod 23 and can be extended from the sleeve rod 23. If the height of the steering rod 22 needs to be adjusted, the steering rod 22 can be pulled out of the sleeve rod 23.When the foldable trailer body 1 needs to be pulled, the sleeve rod 23 can be rotated relative to the folding lever 211 so that it assumes an inclined position to facilitate pulling. When the telescopic inner rod 18 is extended, it moves the steering crossbar 21 and the first wheel 24 synchronously with it, thus increasing the distance between the support point of the first wheel 24 and the support point of the second wheels 15. This places the support point of the seat assembly 4 entirely between the first wheel 24 and the second wheels 15, thereby improving the stability of the electric trailer when transporting passengers. Furthermore, two first wheels 24 are provided, each arranged at one of the two ends of the steering crossbar 21. The end of the folding lever 211 facing away from the sleeve rod 23 is pivotally connected to a steering linkage 212, with each of the two ends of the steering linkage 212 being rotatably connected to the two first wheels 24; in particular, a three-wheeled structure tends to tip over easily when cornering. To improve the driving stability of the foldable cart body 1 and thus the safety of the driver, the present embodiment preferably provides two first wheels 24, each arranged at one of the two end faces of the steering crossbar 21. To enable simultaneous and unidirectional rotation of the two first wheels 24, a steering linkage 212 is pivotally connected to the lower end of the folding lever 211.The two ends of the steering linkage 212 are each rotatably connected to the corresponding first wheel 24. When the articulated lever 211 is rotated, the steering linkage 212 is displaced in a horizontal direction, which in turn rotates the two first wheels 24 either to the left or to the right, thus achieving synchronous control of the two first wheels 24. Furthermore, in the present embodiment, a vertical first sliding groove 133 is provided at the lower ends of each of the two support components 14 adjacent to the steering rod assembly 2. A footplate 3 is arranged between the two first sliding grooves 133. A first sliding axis 31 is provided on each of the two sides of the lower end of the footplate 3, the lower end of the footplate 3 being slidably connected to the first sliding groove 133 via the first sliding axis 31. In particular, when the steering rod assembly 2 is moved in a horizontal direction and the user is on the seat assembly 4, the gap between the two telescopic inner rods 18 results in an unsatisfactory foot position. Although the feet could be placed on the two telescopic inner rods 18, this position leads to an unaesthetic splay of the legs.In the present embodiment, an external and vertical first sliding groove 133 is provided at each of the lower ends of the two support components 14 of the first shelf 11; that is, the first sliding groove 133 is arranged outside the surface of the support component 14. A tread 3 is provided between the two first sliding grooves 133. A first sliding axis 31 is provided on each of the two sides of the lower end of the tread 3. The tread 3 is slidably connected to the first sliding groove 133 via the first sliding axis 31, so that the tread 3 is limited in front of the two support components 14. The tread 3 can be tilted relative to the support component 14 by the interaction of the first sliding axis 31 with the first sliding groove 133. When the steering rod assembly 2 is not yet extended, the tread 3 is positioned vertically in front of the support component 14.Once the steering rod assembly 2 is extended, the footplate 3 can be tilted down and supported on the telescopic inner rod 18 and the steering crossbar 21. In this state, the user, when seated on the seat assembly 4, can rest their feet on the footplate 3. The arrangement of the footplate 3 also allows the user to drive while standing. To ensure that the tread surface 3 does not need to be manually locked in its vertical position in front of the support components 14, two second sliding grooves 134 are provided at the upper ends of each of the two support components 14, which have the first sliding grooves 133. A recess is provided on the upper surface of each of the second sliding grooves 134 (not shown in the drawings). A second sliding axis 32 is provided on each of the two sides of the end of the tread surface 3 facing away from the first sliding axis 31, and these correspond to the second sliding grooves 134. Thus, the tread surface 3 is vertically limited at the front end of the foldable cart body 1 by the interaction of the second sliding axes 32 with the second sliding grooves 134.To tilt the tread surface 3, it simply needs to be pulled upwards so that the second sliding axes 32 can be released through the recess from the second sliding grooves 134, after which the tilting of the tread surface 3 can take place. It should be noted that the tread surface 3 is located above the telescopic inner rod 18 and can tilt relative to the support components 14. To prevent the telescopic inner rod 18 from interfering with the tilting process, a release structure corresponding to the telescopic inner rod 18 is provided at the end of the tread surface 3 adjacent to the foldable carriage body 1 in its horizontal position, so that the tread surface 3 can tilt unhindered. Furthermore, at least one folding limit pin 33 is provided in the lower area of ​​the underside of the footplate 3, which serves to limit the horizontal movement of the steering rod assembly 2 when the footplate 3 is folded. At least one unfolding limit pin 34 is provided in the upper area of ​​the underside of the footplate 3, which serves to limit the horizontal movement of the steering rod assembly 2 when the footplate 3 is unfolded. At least one pin hole 213 corresponding to the folding limit pin 33 and the unfolding limit pin 34 is provided on the upper side of the steering crossbar 21.In the center of the upper end of the tread 3, a recess 35 corresponding to the folding lever 211 is provided; in particular, at least one folding limit pin 33 is provided at the end of the tread 3 adjacent to the foldable carriage body 1 in its horizontal state, and is spaced apart and arranged parallel to the underside of the tread 3. At least one unfolding limit pin 34 is provided at the end of the tread 3 facing away from the foldable carriage body 1 in its horizontal state. Simultaneously, at least one pin hole 213 corresponding to and fitting the folding limit pin 33 and the unfolding limit pin 34 is provided on the upper side of the steering crossbar 21. When the tread 3 is horizontal, the unfolding limit pin 34 engages in the pin hole 213, thereby preventing the steering crossbar 21 from being moved in the horizontal direction by the limit of the tread 3.Only when the footplate 3 is raised can the steering crossbar 21 be moved horizontally. To retract the steering crossbar 21, the footplate 3 must first be raised so that the folding limit pin 34 disengages from the pin hole 213 and the footplate 3 rests vertically against the support component 14. This rotates the folding limit pin 33 from a direction pointing towards the foldable carriage body 1 to a downward direction. Once the steering crossbar 21 has been retracted a certain distance, its further movement is blocked by the folding limit pin 33. In this state, the footplate 3 must be pulled upward. The arrangement of the first sliding groove 133 moves the footplate 3 upward when an upward force is applied.Once the steering crossbar 21 has lost its locking action via the folding limit pin 33, it can be retracted further until it reaches its end position. When the footplate 3 is subsequently lowered, the folding limit pin 33 engages directly in the pin hole 213 due to its alignment with the pin hole 213. Because of the locking action of the folding limit pin 33, the steering crossbar 21 can no longer be moved horizontally after being retracted. Thus, the extension limit pin 34 on the footplate 3 limits the movement of the steering crossbar 21 after it is extended, and the folding limit pin 33 limits the movement of the steering crossbar 21 after it is retracted. Furthermore, in this embodiment, a folding limiting sleeve 217 is slid over each pivot point between the respective telescopic inner rod 18 and the steering crossbar 21, wherein a sleeve return spring is provided at the end of the folding limiting sleeve 217 facing the steering crossbar 21, and wherein the folding limiting sleeve 217 is arranged in the connection point between the telescopic inner rod 18 and the steering crossbar 21 under the action of the sleeve return spring; in particular, the telescopic inner rod 18 is completely retracted into the first shelf 11. However, since the steering crossbar 21 is limited by the support components 14, a gap results between the steering crossbar 21 and the first shelf 11. This gap would cause the telescopic inner rod 18 to be blocked by the support frame 131 during rotation and to be unable to rotate together with the first shelf 11.Therefore, horizontally extending extension blocks 219 must be provided at both ends of the telescopic inner rod 18 to fill the gap between the telescopic inner rod 18 and the first shelf 11. This allows the telescopic inner rod 18 to be fully retracted into the first shelf 11, and its center of rotation is coaxial with the center of rotation of the first shelf 11. Since the steering crossbar 21 is rotatably connected to the telescopic inner rod 18, a folding limiting sleeve 217 is slidably mounted on the extension block 219 to prevent the telescopic inner rod 18 from rotating relative to the steering crossbar 21 during normal use. A sleeve return spring (not shown) is provided on each of the two sides of the end of the folding limiting sleeve 217 facing the steering crossbar 21.The folding limit sleeve 217 is pressed against the rotary joint between the extension block 219 and the telescopic inner rod 18 by the force of the sleeve return springs. The folding limit sleeve 217 prevents the telescopic inner rod 18 from rotating relative to the extension block 219. When the steering crossbar 21 is retracted to its end position, the folding limit sleeve 217 first comes into contact with the first shelf 11. The pressure from the first shelf 11 moves the folding limit sleeve 217 towards the steering crossbar 21 and simultaneously compresses the sleeve return spring. When the steering crossbar 21 is fixed by the folding limiting pin 33, the folding limiting sleeve 217 has already detached from the rotary connection between the extension block 219 and the telescopic inner rod 18, so that the telescopic inner rod 18 can now rotate relative to the extension block 219.When the steering crossbar 21 is extended, the folding limiting sleeve loses the pressure through the first shelf 11 and is moved back to the rotary connection between the extension block 219 and the telescopic inner rod 18 by the spring force of the sleeve return spring. It should be noted that a guide pin 218 is provided on each side of the end of the folding limiting sleeve 217 facing the steering crossbar 21, which can be inserted into the steering crossbar 21. The sleeve return spring is arranged outside the guide pin 218 to prevent the sleeve return spring from being displaced during compression and thus undergoing unwanted deformation. Furthermore, spaced-apart folding connecting tabs 214 are provided on the upper side of the folding lever 211. A insertion opening 215 is formed between the two folding connecting tabs 214. A projection 231 is provided at the lower end of the sleeve rod 23, which is inserted between the two folding connecting tabs 214 and rotatably connected via a pivot axis. A folding limiting element 232 is movably arranged inside the lower end of the sleeve rod 23. When the steering rod 22 presses the folding limiting element 232, one end of the folding limiting element 232 projects through the projection 231 and engages in the insertion opening 215. In particular, spaced-apart hinge connecting tabs 214 are provided on the upper side of the hinge lever 211. Simultaneously, a projecting projection 231 is formed on the underside of the sleeve rod 23, corresponding to the distance between the two hinge connecting tabs 214, so that the projection 231 can be inserted between the two hinge connecting tabs 214. To achieve the rotatable connection, the projection 231 and the two hinge connecting tabs 214 are connected via a pivot axis, thus enabling rotation of the sleeve rod 23 relative to the hinge lever 211. To prevent the sleeve rod 23 from rotating relative to the hinge lever 211 when not required, a folding limiting element 232 is slidably arranged within the lower end of the sleeve rod 23, which can move up and down within the lower end of the sleeve rod 23. One end of the folding limiting element 232 can protrude through the projection 231.Simultaneously, a folding limit return spring 233 is provided at the end of the folding limit element 232 located inside the sleeve rod 23. When the folding limit element 232 is pressed by the steering rod 22, one end of the folding limit element 232 protrudes from the projection 231, and at the same time the folding limit element 232 compresses the folding limit return spring 233. When the force exerted by the steering rod 22 is released, the folding limit element 232 is retracted back into the sleeve rod 23 by the restoring force of the folding limit return spring 233. To enable the folding limit element 232 to be fixed inside the sleeve rod 23 by the folding lever 211, a slot 215 is formed between the two folding connecting tabs 214 on the upper side of the folding lever 211. When one end of the folding limiting element 232 protrudes through the projection 231, it engages in the insertion opening 215.The interaction of the folding limiting element 232 with the insertion opening 215 prevents rotation of the sleeve rod 23 relative to the folding lever 211. A pivot-axis sliding hole 234 is formed in the center of the folding limiting element 232, and the pivot axis, which rotatably connects the sleeve rod 23 to the folding lever 211, is located within the pivot-axis sliding hole 234. This allows the folding limiting element 232 to slide between the sleeve rod 23 and the folding lever 211. When the folding limiting element 232 loses the pressure from the steering rod 22, the folding limit return spring 233 lifts the folding limiting element 232. In this case, the stroke by which the folding limiting element 232 can be lifted is limited by the pivot axis and can be adjusted via the length of the pivot-axis sliding hole 234. Furthermore, in this embodiment, a handle ring 221 is provided on the upper side of the steering rod 22. A folding groove 222 is formed on each of the two sides of the handle ring 221. A handle lever 223 is rotatably connected to the same end of the two folding grooves 222. One of the handle levers 223 is electrically connected to the control unit 17 and serves to control the running speed of the first wheel 24 and / or the second wheel 15. A limiting device 224 is also provided at the end of the handle lever 223 connected to the folding groove 222. This limiting device serves to limit the handle lever 223 when it is received in the folding groove 222 or when it is in a horizontal position relative to the handle ring 221. The handle ring 221 is further equipped with several control buttons 225 and a display device 226, wherein the several control buttons 225 and the display device 226 are each electrically connected to the control unit 17 via lines.Corresponding limit holes 227 are provided on the side wall of the steering rod 22 and on the side wall of the sleeve rod 23. A limit pawl pin 228, which corresponds to the limit hole 227, is also arranged inside the steering rod 22. A pawl pin button 229 is provided inside the lower end of the handle ring 221, which drives the limit pawl pin 228 to extend or retract. A brake device 216, which is connected to the first wheel 24, is also provided on the steering crossbar 21. In particular, a grip ring 221 is provided on the upper side of the handlebar 22. The shape of the grip ring 221 can be inverted trapezoidal, triangular, rectangular, circular, or another polygon to allow the user to pull easily. A folding groove 222 is formed on each of the two sides of the grip ring 221. Simultaneously, a grip lever 223 is rotatably connected to one end of the folding groove 222. The grip lever 223 can be stored in the folding groove 222 when not in use. If necessary, the grip lever 223 can be rotated into a horizontal position. To better accommodate the riding habits of an average user, one of the grip levers 223 can be designed to be rotatable, i.e., it can rotate in a fixed position on the grip ring 221, similar to the throttle grip of an electric bicycle, and control the rotational speed of the first wheel 24 via the angle of rotation.A limiting device 224 is also provided on the upper side of the end of the folding groove 222 connected to the handle lever 223. The limiting device 224 has a detent pin structure with an internal spring. Simultaneously, a limiting hole 227 corresponding to the limiting device 224 is formed on the end of the handle lever 223 connected to the folding groove 222. This hole serves to limit the handle lever 223 when it is in a horizontal position relative to the handle ring 221 or when it is in the grip ring. Several control buttons 225 are also provided on the handle ring 221. The control buttons 225 include, but are not limited to, a forward / reverse button, a drive / traction mode switch button, a traction assist speed control button, a light switch button, a horn button, a turn signal control button, etc.Specifically, reference can be made to the button design of state-of-the-art electric bicycles. Furthermore, a display device 226 for showing battery charge, speed, and the like is provided on the handlebar 221. The control buttons 225 and the display device 226 are each electrically connected to the control unit 17 via cables. Corresponding limit holes 227 are formed on the side wall of the steering rod 22 and on the side wall of the sleeve rod 23. Simultaneously, a limiting pawl pin 228 is arranged inside the steering rod 22, which corresponds to the limiting holes 227. A pawl pin button 229 is also provided on the handle ring 221. When the pawl pin button 229 is pressed, the limiting pawl pin 228 protrudes from the steering rod 22 and engages in the limiting holes 227 of the steering rod 22 and the sleeve rod 23, thus limiting the movement of the steering rod 22 and preventing free movement of the steering rod 22 within the sleeve rod 23. The specific interaction between the latching pin 229 and the limiting latching pin 228 can be the locking mechanism for telescopic handles of suitcases of the prior art or of the Chinese patent application CN201821724858.2. The structure revealed here corresponds to the structure, which is why it will not be discussed in further detail. A braking device 216 is also provided on the steering crossbar 21. The braking device 216 operates according to the conventional foot brake principle of tricycles and is connected to the brake structures of the first two wheels 24. By actuating the braking device 216, the speed of the first wheels 24 can be reduced or they can be brought to a standstill. Furthermore, in this embodiment the seat arrangement 4 is made of a rigid material, wherein both ends of the seat arrangement 4 are rotatably connected to the two sides of the front top of the foldable cart body, and wherein the seat arrangement 4 can be folded forwards or backwards relative to the foldable cart body; In particular, the seat assembly 4 is made of a rigid material, such as wood, plastic, or aluminum, to improve its load-bearing stability and capacity. This ensures sufficient load-bearing capacity while maintaining a low weight. When using a rigid material, the two ends of the seat assembly 4 are rotatably connected to the sides of the front upper section of the foldable cart body 1, allowing them to lie flat within the front upper section of the foldable cart body 1 when in use. The user can sit directly on it if required. The seat assembly 4 is supported by the transition stem 132 on the foldable cart body 1 and can bear the user's weight.Due to the rotating connection of the seat assembly 4, it can be folded counterclockwise around the front end of the foldable cart body 1 when placing items on it, so that it is located outside the front end of the foldable cart body 1 and does not obstruct the placement of items. After the items have been placed, the seat assembly 4 can simply be folded back clockwise so that it is again located inside the front end of the foldable cart body 1. At the same time, the rotating connection prevents the foldable cart body 1 from being blocked by the seat assembly 4 when folded, thus preventing it from being folded completely and requiring a large amount of space. In addition, folding the seat assembly 4 allows it to be used as a table for outdoor activities. Furthermore, in this embodiment, the seat assembly 4 is made of a flexible material. The seat assembly 4 is arranged within the front upper area of ​​the foldable cart body 1. A support rod connected to the foldable cart body 1 is provided at the front and / or rear of the seat assembly 4. In particular, the seating arrangement 4 can also be made of a flexible material, such as fabric, to reduce weight and improve seating comfort. When fabric is used, the two ends of the seating arrangement 4 are mounted on the transition posts 132, with the seating arrangement 4 being supported by the transition posts 132 so that the user can sit directly on the seating arrangement 4. However, due to the softness of the seating arrangement 4, there is a risk that, under the influence of weight, it will pull the two sides of the support arrangement 13 inwards, leading to tilting or deformation and impairing its use. Therefore, it is necessary to provide supports at the front and / or back of the seating arrangement 4, preferably at both the front and the back. The ends of the supports must be connected to the transition posts 132 to limit inward tilting of the two sides of the support arrangement 13.It should be noted that the supports can be connected in a detachable or slidable manner. A slidable connection means that it can be moved in the direction of the steering rod assembly 2 in order to adjust the position of the supports relative to the foldable cart body 1 and thus prevent any interference with the folding of the foldable cart body 1 when retracting. Operating state and principle: As shown in Fig. 1, the cart is in travel mode. To fold it in this state, the footplate 3 is first lifted from the steering crossbar 21 and placed vertically against the front face of the foldable cart body 1. The steering rod assembly 2 is then moved towards the foldable cart body 1, retracting the telescopic inner rod 18 until the steering crossbar 21 is blocked by the folding limit pin 33. By lifting the footplate 3 again, the telescopic inner rod 18 can be fully retracted and the steering crossbar 21 fully retracted simultaneously. During this process, the folding limit sleeve 217 is pushed back by the pressure of the first shelf 11 against the extension block 219, thus exposing the pivot connection between the extension block 219 and the telescopic inner rod 18.When the steering crossbar 21 is fully retracted, the folding limit pin 33 aligns with the pin hole 213. At this point, the footplate 3 is lowered, causing the folding limit pin 33 to engage in the pin hole 213 and limit the movement of the steering crossbar 21. Subsequently, an upward force is applied to the center of the first shelf 11 and the second shelf 12 to fold them together. During the folding process, the support assemblies 13 on both sides are pulled along until the vehicle is fully folded, as shown in Fig. 9. To extend the cart, a forward force is initially applied to one end of the foldable cart body 1 and a backward force to the other. These two forces pull the first shelf 11 and the second shelf 12 from their folded state into the flat position. During the alignment of the first shelf 11 and the second shelf 12, the support assemblies 13 on both sides are aligned synchronously. After alignment is complete, the platform 3 is raised, disengaging the folding limit pin 33 from the pin hole 213. The steering rod assembly 2 is then pulled forward. After a predetermined distance, the platform 3 is lowered again. At this point, the unfolding limit pin 34 engages in the pin hole 213, thus limiting the movement of the steering rod assembly 2 in the extended state and preventing it from extending or retracting.Simultaneously, when the steering rod assembly 2 is extended, the folding limiting sleeve 217 is pushed forward by the restoring force of the sleeve's return spring due to the removal of the pressure from the first shelf 11. It is thus pulled over the connection point between the extension block 219 and the telescopic inner rod 18, thereby blocking rotation of the steering crossbar 21 relative to the telescopic inner rod 18. The expansion process is now complete. The user can now sit on the seat assembly 4, place their feet on the footrest 3, and rest their hands on the steering rod assembly 2 to steer the vehicle. The semi-extended state, as shown in Figures 7 and 8, is a state in which the foldable carriage body 1 is fully extended, but the steering rod assembly 2 is not yet extended. This state is advantageous for pulling. For this purpose, the limiting pawl pin 228 can be retracted by actuating the pawl pin button 229. The steering rod 22 can then be pulled out relative to the sleeve. After the steering rod 22 has been extended by a predetermined distance and the limiting holes 227 of the steering rod 22 and the sleeve are aligned, the limiting pawl pin 228 automatically passes through the limiting holes 227 of the steering rod 22 and the sleeve, thus limiting the steering rod 22 once again.Simultaneously, when the steering rod 22 is extended, the folding limiting element 232 is pushed upwards by the restoring force of the folding limiting return spring 233 due to the removal of the pressure from the steering rod 22. The end of the folding limiting element 232 disengages from the insertion opening 215 and retracts into the projection 231. At this point, the sleeve rod 23 can be rotated up and down relative to the folding lever 211, thereby tilting the steering rod 22 and facilitating pulling. Naturally, the pulling position of the steering rod assembly 2 can also be changed when the electric vehicle is in driving mode. Driving is also possible in the partially extended position. However, since the support point of the first wheel 24 is located a short distance from the support load point of the seat assembly 4, there is a risk of the rear section being lifted if there is a weight in front of it, which compromises safety.Therefore, traveling with a seated person in this condition is not recommended. In summary, the present invention provides a seating function by arranging the seat assembly 4 on the front upper surface of the foldable cart body 1, thereby making the use of the electric cart less strenuous. Simultaneously, the steering rod assembly 2 is slidably connected to the foldable cart body 1, allowing it to be extended. This increases the distance between the support point of the seat assembly 4 and the support point of the first wheel 24, improving stability during passenger transport and thus safety. Furthermore, a footplate 3 is provided at the front of the foldable cart body 1, facilitating foot placement and standing while in motion, thus increasing the versatility of the electric cart. In addition, the electric cart can be folded and stored for increased portability. The present invention is not limited to the content described in the description and embodiments. Therefore, additional advantages and modifications can easily be realized by persons with expertise in the field. Consequently, the invention is not limited to the specific details, representative devices, and illustrative examples shown and described herein, as long as the spirit and scope of the general concept defined by the claims and their equivalent scope are not deviated from. Summary The present invention relates to a novel manned foldable electric trailer comprising: a foldable body, a seating arrangement provided at the top of the front end of the foldable body, a steering rod arrangement connected to the underside of the front end of the foldable body, the steering rod arrangement being connected to at least one first wheel, and at least two second wheels being provided at an end of the foldable body extending away from the steering rod arrangement, and the foldable body further comprising a power supply for providing electrical energy and a control unit. The above design, by providing a seating arrangement at the top of the front end of the foldable body, enables a passenger transport function, thereby making the use of the electric trailer more energy-efficient.Simultaneously, the steering column assembly is slidably connected to the foldable trailer body, allowing it to be extended. This increases the distance between the support point of the seat assembly and the support point of the first wheel, thus improving stability and safety while riding with a passenger. Furthermore, a footrest is provided at the front end of the foldable trailer body, facilitating foot placement and standing while riding, thereby expanding the versatility of the electric trailer. Additionally, the electric trailer can be folded for storage, improving portability. QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature CN 202220922980.0

[0003] CN 201821724858.2

[0053]

Claims

Novel manned foldable electric trailer, characterized in that it comprises: a foldable body which is foldable longitudinally between the front and rear ends, wherein a seat arrangement is provided on the upper side of the front end of the foldable body, a steering rod arrangement is connected to the underside of the front end of the foldable body which is connected to at least one first wheel, and wherein at least two second wheels are provided at an end of the foldable body which is away from the steering rod arrangement, and wherein the foldable body further comprises a power supply for providing electrical energy to the first wheel and / or the second wheels and a control unit for controlling the operation of the first wheel and / or the second wheels;wherein the foldable carriage body comprises a first shelf and a second shelf, wherein one end of the first shelf is connected to one end of the second shelf, wherein a support arrangement is provided on each of the two sides of the first shelf, and wherein the two ends of each support arrangement are each connected to a support component, and wherein when the first shelf and the second shelf fold each other together, they can drive the support arrangements on both sides simultaneously as they fold. Novel manned foldable electric trailer according to claim 1, characterized in that a telescopic inner rod is slidably arranged in both sides of an end of the first shelf, wherein the telescopic inner rod can be extended out of the first shelf in order to move the steering rod arrangement away from the first shelf. Novel manned foldable electric trailer according to claim 1, characterized in that the steering rod arrangement comprises a steering crossbar and a steering rod, wherein the first wheel is arranged below the steering crossbar, and a folding lever is inserted in the middle of the steering crossbar, which is rotatable horizontally relative to the steering crossbar, wherein the lower part of the folding lever is connected to the first wheel, and the steering rod drives the first wheel for steering via the folding lever. Novel manned foldable electric trailer according to claim 3, characterized in that the steering rod arrangement further comprises a sleeve rod, wherein one end of the sleeve rod is rotatably connected to the upper end of the folding lever, the steering rod is slidably arranged in the sleeve rod, and wherein the steering crossbar is rotatably connected to the telescopic inner rod. Novel manned foldable electric trailer according to claim 2, characterized in that a support frame is connected between the two support components at the same ends of the two support arrangements, wherein a horizontal transition rod is connected to the upper ends of the two ends of each support arrangement, wherein the upper ends of the two ends of the support arrangement are connected to the support component via the transition rod. Novel manned foldable electric trailer according to claim 3, characterized in that the number of first wheels is two, wherein the two first wheels are arranged at both ends of the steering crossbar, wherein a steering connecting rod is movably connected to one end of the folding lever that is away from the sleeve rod, wherein the two ends of the steering connecting rod are rotatably connected to the two first wheels. Novel manned foldable electric trailer according to claim 3, characterized in that a vertical first sliding groove is provided at the lower ends of each of the two support components adjacent to the steering rod assembly, wherein a tread surface is arranged between the two first sliding grooves, wherein a first sliding axis is provided on each of the lower ends of the surface, and wherein the lower end of the tread surface is slidably connected to the first sliding groove via the first sliding axis. Novel manned foldable electric trailer according to claim 7, characterized in that at least one folding limiting pin is provided in the lower end of the underside of the footplate, which serves to limit the horizontal displacement of the steering rod assembly in the folded state of the footplate, at least one pin hole corresponding to the folding limiting pin is provided on the upper side of the steering crossbar, and wherein a recess corresponding to the folding lever is provided in the middle of the upper end of the footplate. Novel manned foldable electric trailer according to claim 8, characterized in that at least one unfolding limiting pin is provided in the upper end of the underside of the footplate, which serves to limit the horizontal displacement of the steering rod assembly in the unfolded state of the footplate, wherein the unfolding limiting pin corresponds to the pin hole. Novel manned foldable electric trailer according to claim 4, characterized in that spaced-apart folding connection tabs are provided at the upper end of the folding lever, wherein a plug-in opening is provided between the two folding connection tabs, wherein a projection is provided at the lower end of the sleeve rod which is inserted between the two folding connection tabs and rotatably connected via a pivot axis, wherein a folding limiting element is movably arranged in the lower end of the sleeve rod, wherein when the steering rod presses the folding limiting element, an end of the folding limiting element projects out of the projection and is inserted into the plug-in opening, thereby limiting a rotation of the sleeve rod relative to the folding lever. Novel manned foldable electric trailer according to claim 4, characterized in that a handle ring is provided at the upper end of the steering rod, wherein a folding groove is provided on both sides of the handle ring, wherein a handle lever is rotatably connected to each of the two folding grooves at the same end of each, and wherein one of the two handle levers is electrically connected to the control unit to control the running speed of the first wheel and / or the second wheel. Novel manned foldable electric trailer according to claim 11, characterized in that corresponding limiting holes are provided on the side wall of the steering rod and the side wall of the sleeve rod, wherein a limiting pawl pin is further arranged in the steering rod which corresponds to the limiting holes, wherein a pawl pin button is provided in the lower end of the handle ring which drives the limiting pawl pin to extend or retract. Novel manned foldable electric trailer according to claim 3, characterized in that a braking device is further provided on the steering crossbar, which is connected to the first wheel. Novel manned foldable electric trailer according to claim 3, characterized in that a folding limiting sleeve is slid over at each pivot point between the respective telescopic inner rod and the steering crossbar, wherein a sleeve return spring is provided at the end of the folding limiting sleeve facing the steering crossbar, and the folding limiting sleeve is arranged in the connection point between the telescopic inner rod and the steering crossbar under the action of the sleeve return spring. Novel manned foldable electric trailer according to claim 1, characterized in that the seat arrangement is made of a rigid material, wherein both ends of the seat arrangement are rotatably connected to the two sides of the front upper surface of the foldable vehicle body, and wherein the seat arrangement can be folded forward or backward relative to the foldable vehicle body. Novel manned foldable electric trailer according to claim 1, characterized in that the seating arrangement is made of a flexible material, wherein the seating arrangement is arranged in the front upper surface of the foldable vehicle body, and wherein a support rod connected to the foldable vehicle body is provided at the front and / or the rear of the seating arrangement. Novel manned foldable electric trailer according to claim 2, characterized in that the end of the telescopic inner rod facing away from the second shelf is rotatably connected to the steering rod assembly.

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