Mobile electric folding trailer

Abstract

A mobile electric folding trailer, characterized in that it comprises a folding trailer body, a control unit and a steering rod unit, wherein trailing wheels are attached to the bottom of the rear part of the folding trailer body, the control unit is arranged on the folding trailer body, and wherein the steering rod unit comprises a steering rod, the bottom of the steering rod is connected to a drive wheel unit which rotates with the steering rod, wherein the lower end of the steering rod is connected above the drive wheel unit to a footrest unit, the steering rod rotates relative to the footrest unit, an end of the footrest unit located away from the steering rod is connected to the front side of the folding trailer body, and wherein the drive wheel unit is electrically connected to the control unit, and wherein a seat plate is detachably attached to the top of the folding trailer body.

Description

TECHNICAL AREA

[0001] The present invention relates to the technical field of folding trailers, in particular a mobile electric folding trailer. TECHNICAL BACKGROUND

[0002] 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.

[0003] 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 vehicle body, an electric auxiliary drive is achieved when attaching the trailer, thus improving energy savings and ease of use. However, this solution still has drawbacks. While it allows for some energy savings, it still requires manual pulling and is not suitable for transporting people. Long walks are unavoidable during outdoor activities, which, even with the assistance of a drive, leads to user fatigue.

[0004] Therefore, there is an urgent need to design a mobile electric folding trailer to overcome one or more of the above-mentioned shortcomings of the state of the art. CONTENT OF THE PRESENT APPLICATION

[0005] To achieve the above technical purpose, the technical solution employed by the present invention is: a mobile electric folding trailer, characterized in that it comprises a folding trailer body, a control unit, and a steering rod unit, wherein trailing wheels are attached to the bottom of the rear part of the folding trailer body, the control unit is arranged on the folding trailer body, and wherein the steering rod unit comprises a steering rod, the bottom of the steering rod is connected to a drive wheel unit that rotates with the steering rod, the lower end of the steering rod being connected above the drive wheel unit to a footrest unit, the steering rod rotating relative to the footrest unit, an end of the footrest unit remote from the steering rod being connected to the front side of the folding trailer body, and wherein the drive wheel unit is electrically connected to the control unit.and a removable seat plate is attached to the top of the folding trolley body.

[0006] In a preferred embodiment, the drive wheel unit comprises two electric wheels and a frame, wherein the two electric wheels are each electrically connected to the control unit, and a wheel axle is arranged on the top of the frame.

[0007] In a preferred embodiment, the two electric wheels are arranged at a distance in the frame, wherein the two electric wheels are arranged coaxially, wherein a mounting bore is provided on the underside of the control rod, and the wheel axle is inserted into the mounting bore and detachably connected to it.

[0008] In a preferred embodiment, a connecting base is provided on the front side of the folding trolley body, wherein the end of the footrest unit furthest from the control rod is rotatably connected to the connecting base.

[0009] In a preferred embodiment, the footrest unit comprises a support rod and an adapter piece, wherein two support rods are provided, wherein the same end side of each of the two support rods is rotatably connected to the two ends of the adapter piece, the adapter piece serving to connect the support rods to the control rod.

[0010] In a preferred embodiment, the support rod rotates horizontally relative to the adapter piece.

[0011] In a preferred embodiment, the adapter piece comprises two connecting sections and an adapter pivot axis, wherein the two connecting sections are rigidly connected to each other via the adapter pivot axis, and wherein a shaft bushing is rotatably connected to the adapter pivot axis, and one end of the shaft bushing is movably fitted onto the outside of the control rod.

[0012] In a preferred embodiment, two limiting rods are further arranged between the two connecting sections, each serving to limit the rotation angle of the shaft bushing.

[0013] In a preferred embodiment, a first limiting device is arranged on the outside of the end of the shaft bushing that is connected to the adapter axis of rotation, wherein the first limiting device serves to fix the rotation angle of the shaft bushing relative to the adapter axis of rotation, and wherein a second limiting device is arranged on the outside of the end of the shaft bushing that is connected to the control rod, wherein the second limiting device serves to fix the position of the shaft bushing relative to the control rod.

[0014] In a preferred embodiment, a connecting element is further arranged at the end of the support rod that is connected to the folding trolley body, wherein the connecting element is rotatably connected to the folding trolley body, wherein the connecting element rotates vertically relative to the folding trolley body, the support rod is rotatably connected to the connecting element and rotates horizontally relative to the connecting element.

[0015] In a preferred embodiment, two connecting bases are provided, wherein the two connecting bases are each arranged on the two sides of the front side of the folding trolley body, wherein a third limiting device for limiting the rotation of the footrest unit is fixedly arranged on the opposite sides of the two connecting bases and the two third limiting devices are connected via a pull cord.

[0016] In a preferred embodiment, a steering rod is slidably arranged in the steering rod, wherein the upper side of the steering rod is T-shaped, and a handle is rotatably connected to each of the two ends of the upper side of the steering rod, wherein a first sleeve is slidably arranged on the outside of the end of each of the two handles that is connected to the steering rod, and wherein several control buttons are provided on the upper side of the steering rod, each of which is electrically connected to the control unit, and wherein a fourth limiting device is arranged on the outside of the upper side of the steering rod, which serves to limit the displacement of the steering rod.

[0017] In a preferred embodiment, a display is further arranged on the side of the upper side of the steering rod facing the folding trolley body, which is electrically connected to the control unit.

[0018] In a preferred embodiment, upwardly vertically extending extension sections are arranged at the ends of the two handlebars that are away from the steering rod, wherein a second sleeve is slidably arranged on one of the extension sections and an auxiliary switch button is provided on the other extension section, which is electrically connected to the control unit.

[0019] In a preferred embodiment, handle sleeves are arranged on both handle bars, one of the handle sleeves being rotatable with the handle bar and electrically connected to the control unit, the handle sleeve rotating with the handle bar as its center of rotation to control the speed of the folding trolley body.

[0020] In a preferred embodiment, a deflection rod is arranged at the lower end of the control rod, the lower end of which is connected to the drive wheel assembly. In a preferred embodiment, spaced-apart deflection connection lugs are arranged on the upper side of the deflection rod, with a plug-in opening formed between the two deflection connection lugs. A projection is provided at the lower end of the control rod, which is inserted between the two deflection connection lugs and rotatably connected via a pivot axis. A folding limiting element is movably arranged in the lower end of the control rod, with one end of the folding limiting element passing through the projection and being inserted into the plug-in opening.

[0021] In a preferred embodiment, the control unit comprises a control unit and at least one power source electrically connected to the control unit, wherein the drive wheel unit and the steering rod unit are each electrically connected to the control unit.

[0022] In a preferred embodiment, a foot brake is also provided on the footrest unit, which is connected to the brake structure of the drive wheel unit and / or the trailing wheels.

[0023] The advantageous effect of the present invention is as follows: With the above design, the arrangement of the footrest unit and the steering rod unit at the front end gives the folding trolley body the same functions as electrically powered transport of people and goods, electrically assisted towing, as well as folding and storage. It exhibits the characteristics of lightness, portability, and easy mobility to meet usage requirements in various scenarios. At the same time, the steering rod unit can change its configuration according to usage requirements to increase practicality. Furthermore, both the footrest unit and the steering rod unit can be folded to reduce space requirements and further improve practicality. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows a schematic representation of the structure of the present invention; Fig. 2 shows an exploded view of the present invention; Fig. Figure 3 shows a schematic representation of the structure of a folding trolley body of the present invention; Fig. Figure 4 shows a schematic representation of the structure of a push-bar unit of the present invention; Fig. Figure 5 shows a schematic representation of the structure of a steering rod unit of the present invention; Fig. Figure 6 shows a representation of the unlocked state of a folding limiting element of the present invention; Fig. Figure 7 shows a representation of the locking state of a folding limiting element of the present invention; Fig. Figure 8 shows a further operating state representation of the steering rod of the present invention; Fig. Figure 9 shows a schematic representation of the dragging state of the present invention; Fig. Figure 10 shows a schematic representation of the folded state of the present invention; Fig. Figure 11 shows a functional block diagram of the electrical connection of the present invention; Fig. Figure 12 shows a functional block diagram of a control unit of the present invention. Reference symbol list: 10 folding trolley bodies; 11 connecting bases; 12 third limiting device; 13. Trailing wheel; 14 Seat plate; 20 control unit; 21 Power source; 22 Control unit; 30 Steering column unit; 31 Control rod; 311 lead; 32 Handlebar; 321 Handlebar; 322 first sleeve; 323 Control knob; 324 fourth limiting device; 325 Display; 326 Extension section; 327 second sleeve; 328 Auxiliary switch key; 329 Handle sleeve; 33 Deflection rod; 331 Deflection connecting eye; 332 Plug opening; 34 Folding limit element; 35 Return spring; 36 Rotary axis sliding slot; 40 Drive wheel unit; 41 electric wheel; 42 frame; 43 Wheel axle; 50 Step bar unit; 51 support pole; 52 Connecting element; 53 Adapter piece; 531 Connecting section; 532 Adapter rotary axis; 533 Boundary bar; 534 Shaft bushing; 535 first limiting device; 536 second limiting device DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] In the embodiments of the present useful innovation, the terms "first" and "second" serve purely descriptive purposes and must not be interpreted as indicating or implying relative importance or as an implicit representation 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.

[0027] In the embodiments of this useful innovation, "and / or" refers only to an associative relationship for describing connected objects, which can indicate three possible relationships. For example, "A and / or B" can mean the following three cases: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally denotes an "or" relationship between the linked objects.

[0028] 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 useful innovation. 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 additionally and specifically emphasized. The terms "comprise," "contain," "have," and their variants all mean "including, but not limited to," unless additionally and specifically emphasized otherwise.Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] As in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11 to Fig. As shown in Figure 12, the present invention provides a mobile electric folding trailer comprising a folding trailer body 10, a control unit 20 and a steering rod unit 30, wherein trailing wheels 13 are attached to the bottom of the rear of the folding trailer body 10, the control unit 20 is arranged on the folding trailer body 10, and wherein the steering rod unit 30 comprises a control rod 31, the underside of the control rod 31 being connected to a drive wheel unit 40, and wherein the drive wheel unit 40 rotates with the control rod 31, a footrest unit 50 being connected to the lower end of the control rod 31 and above the drive wheel unit 40, and the control rod 31 rotating relative to the footrest unit 50, wherein an end of the footrest unit 50, which is located away from the control rod 31, is connected to the front side of the folding trailer body 10, and the drive wheel unit 40 is electrically connected to the control unit 20;

[0030] Specifically, the folding trailer body 10 is a commercially available folding trailer. A stationary wheel 13 is located at the rear end of the folding trailer body 10 and cannot rotate horizontally. The steering rod unit 30 is located at the front end of the folding trailer body 10 and comprises a control rod 31 and a drive wheel unit 40, which is located at the lower end of the control rod 31. The drive wheel unit 40 rotates with the rotation of the control rod 31. The steering rod unit 30 also serves to implement the electrical control system. A footrest unit 50 is additionally arranged between the control rod 31 and the folding trailer body 10. One end of the footrest unit 50 is connected to the control rod 31 and the other end to the folding trailer body 10.The footrest unit 50 is arranged horizontally between the steering rod 31 and the folding trailer body 10, allowing the user to stand on the footrest unit 50. Simultaneously, a control unit 20 is located at the front end of the folding trailer body 10. The drive wheel unit 40 is electrically connected to the control unit 20. The user can control the drive wheel unit 40 and regulate the direction via the steering rod unit 30 to move the folding trailer body 10 forwards or backwards, thus enabling the folding trailer body 10 to transport people and goods. To enhance the user experience, a detachable seat panel 14 can also be arranged at the front end of the folding trailer body 10. When the folding trailer is operated in passenger transport mode, the user can sit and ride on the folding trailer using the seat panel 14.

[0031] Furthermore, the drive wheel unit 40 in the present embodiment comprises the following parts: two electric wheels 41 and a frame 42. The two electric wheels 41 are arranged at a distance within the frame 42 and are arranged coaxially to each other. The two electric wheels 41 are each electrically connected to the control unit 20. A wheel axle 43 is arranged on the upper side of the frame 42, a mounting hole is formed at the lower end of the control rod, and the wheel axle 43 is inserted into the mounting hole and detachably connected.

[0032] Specifically, the drive wheel unit 40 comprises two electric wheels 41 and a frame 42 for connecting the two electric wheels 41. The electric wheels 41 are wheels with an integrated motor and brake structure. The two electric wheels 41 are fixed to the two ends of the frame 42 and are positioned at a predetermined distance from each other. This distance can increase the distance between the support points of the two electric wheels 41 to increase the support forces on both sides and thus prevent the center of gravity from shifting from the center when cornering. In contrast, the lateral area of ​​the folding cart body 10 has no support points, which can cause slight tipping. The coaxial arrangement of the two electric wheels 41 ensures stability.The two electric wheels 41 are each electrically connected to the control unit 20. The control unit 20 controls the synchronous forward or reverse rotations as well as the asynchronous running modes of the two electric wheels 41 in order to move the folding cart body 10 forward or backward. The asynchronous running mode is used for cornering, with the control unit 20 controlling a differential running mode of the electric wheels 41. A vertical wheel axle 43 is arranged at the center of the upper surface of the frame 42. Simultaneously, a mounting hole (not shown in the drawings) is formed at the lower end of the control rod 31, which fits the wheel axle 43. The wheel axle 43 is inserted into the mounting hole, and at least one, preferably two or three, locking screws are attached at equal intervals to the side of the control rod 31 to secure the wheel axle 43.One end of each locking screw penetrates the control rod 31 and is connected to the wheel axle 43. If necessary, the drive wheel assembly 40 can be removed from the control rod 31 by disassembling the locking screws.

[0033] It should be noted that a foot brake is additionally provided on the footrest unit 50. This foot brake is connected via a brake line to the brake structure of the electric wheels 41 and / or the trailing wheel. In the present invention, it is preferably connected to the electric wheels 41.

[0034] Furthermore, in this embodiment a connecting base 11 is provided on the front side of the folding trolley body 10, wherein the end of the footrest unit 50 furthest from the control rod 31 is rotatably connected to the connecting base 11.

[0035] Specifically, to facilitate the connection between the folding trolley body 10 and the footrest unit 50, a connecting base 11 is arranged at the front end of the folding trolley body 10. The end of the footrest unit 50 located furthest from the control rod 31 is rotatably connected to this connecting base 11 via a pivot axis. This allows the footrest unit 50 to rotate relative to the connecting base 11 as needed, so that when the folding trolley body 10 is folded, the footrest unit 50 can also be folded relative to the folding trolley body 10, thus reducing the space required.

[0036] Furthermore, in this embodiment, the footrest unit 50 comprises a support rod 51 and an adapter piece 53, wherein two support rods 51 are provided, wherein the same end side of the two support rods 51 is rotatably connected to the two ends of the adapter piece 53, and support rods 51 rotate horizontally relative to the adapter piece 53, the adapter piece 53 serving to connect the support rods 51 to the control rod 31;

[0037] Specifically, two support rods 51 are provided, with the same end of each support rod 51 rotatably connected to one end of the adapter piece 53 via a pivot axis. Each of the two support rods 51 can rotate horizontally relative to the adapter piece 53. The shape of the two support rods 51 can be round, rectangular, or similar. Through horizontal rotation relative to the adapter piece 53, the two support rods 51 and the adapter piece 53 can form a triangular, trapezoidal, rectangular, or similar shape. The shape is determined by the entire length of the adapter piece 53. In the present invention, a trapezoidal shape is preferably chosen to improve stability. The two support rods 51 are connected to the control rod 31 via the adapter piece 53, which facilitates the rotation of the control rod 31 relative to the support rods 51.

[0038] Furthermore, the adapter piece 53 comprises two connecting sections 531 and an adapter pivot axis 532, wherein the two connecting sections 531 are firmly connected to each other via the adapter pivot axis 532, and wherein a shaft bushing 534 is rotatably connected to the adapter pivot axis 532, one end of the shaft bushing 534 being movably fitted onto the outside of the control rod 31.

[0039] Specifically, the adapter piece 53 comprises two connecting sections 531. The same end of each of the two support rods 51 is rotatably connected to the two connecting sections 531. An adapter pivot axis 532 is arranged between the two connecting sections 531, via which the two connecting sections 531 are rigidly connected to each other. A shaft bushing 534 is movably arranged on the adapter pivot axis 532 and can rotate vertically relative to the adapter pivot axis 532. This allows the shaft bushing 534 to rotate the control rod 31 relative to the support rods 51. The shaft bushing 534 cannot move axially around the adapter pivot axis 532 due to the limitations of the two connecting sections 531. The end of the shaft bushing 534 located away from the adapter pivot axis 532 is movably arranged on the outside of the control rod 31.The control rod 31 can rotate horizontally relative to the shaft bushing 534, and the shaft bushing 534 can be moved in the axial direction of the control rod 31.

[0040] Furthermore, two limiting rods 533 are arranged between the two connecting sections 531, each serving to limit the rotation angle of the shaft bushing 534.

[0041] Specifically, to limit the rotation of the shaft bushing 534 to a predetermined angle—since it can rotate relative to the adapter's axis of rotation 532—two limiting rods 533 are arranged between the two connecting sections 531. These two limiting rods 533 are located at a distance from each other in two different positions: one is located on the top of the connecting section 531, the other on the side of the connecting section 531 facing the support rods 51 (i.e., the rear). When the shaft bushing 534 is rotated clockwise by a predetermined angle, it abuts the limiting rod 533 on the rear of the connecting section 531; when it is rotated counterclockwise by a predetermined angle, it abuts the limiting rod 533 on the top of the connecting section 531.In this way, the shaft bushing 534 is limited in both directions, which improves the stability and rationality of its use.

[0042] Furthermore, in this embodiment, a first limiting device 535 is arranged on the outside of the end of the shaft bushing 534, which is connected to the adapter axis of rotation 532, wherein the first limiting device 535 serves to fix the rotation angle of the shaft bushing 534 relative to the adapter axis of rotation 532, wherein a second limiting device 536 is arranged on the outside of the end of the shaft bushing 534, which is connected to the control rod 31, wherein the second limiting device 536 serves to fix the position of the shaft bushing 534 relative to the control rod 31;

[0043] Specifically, a first limiting device 535 is provided on the outside of the end of the shaft bushing 534 that is connected to the adapter pivot axis 532 to prevent the shaft bushing 534 from rotating relative to the adapter pivot axis 532 during use. This first limiting device 535 can be a limiting structure such as a spring cam, a gear, or a locking pin; in the present application, a spring cam is preferably chosen, which is inexpensive, easy to install, and convenient to use. The spring cam has a built-in spring so that the head of the cam can extend automatically under the action of the spring. Detent holes (not shown in the drawings) are also provided on the adapter pivot axis 532, which cooperate with the first limiting device 535. There are two detent holes, and the two detent holes correspond to the angles limited by the two limiting rods 533.This means that when the shaft bushing 534 is limited by one of the limiting rods 533, the first limiting device 535 works in conjunction with one of the detent holes to fix the shaft bushing 534 at that angle; when the shaft bushing 534 is limited by the other limiting rod 533, the first limiting device 535 works in conjunction with the other detent hole to fix the shaft bushing 534 at that angle. A second limiting device 536 is also fixedly arranged on the outside of the end of the shaft bushing 534 that is connected to the control rod 31. This second limiting device 536 serves to limit the axial movement position of the shaft bushing 534 relative to the control rod 31. A detent hole is provided on the top of the control rod 31, which works in conjunction with the second limiting device 536.When the shaft bushing 534 is moved to the top of the control rod 31, the second limiting device 536 works in conjunction with the detent hole at this position to achieve the fixation between the shaft bushing 534 and the control rod 31.

[0044] It should be noted that the second limiting device 536 has the same structure as the first limiting device 535. Since there is no detent hole on the underside of the control rod 31 that interacts with the second limiting device 536, the control rod 31 can rotate relative to the shaft bushing 534 and thereby cause the drive wheel assembly 40 to rotate.

[0045] Furthermore, in this embodiment, a connecting element 52 is arranged at the end of the support rod 51 that is connected to the folding trolley body 10, wherein the connecting element 52 is rotatably connected to the folding trolley body 10, wherein the connecting element 52 rotates vertically relative to the folding trolley body 10, the support rod 51 is rotatably connected to the connecting element 52 and rotates horizontally relative to the connecting element 52;

[0046] Specifically, a connecting element 52 is rotatably attached to the end of the support rod 51 furthest from the adapter piece 53. This connecting element 52 is rotatably connected to the connecting base 11 via a pivot axis. The connecting element 52 can rotate vertically relative to the connecting base 11, and the support rod 51 can rotate horizontally relative to the connecting element 52. This allows the two support rods 51 to move closer together and rest against each other, or further apart and away from each other, as needed. For example, when folding is required, the support rod 51 can be raised: The support rod 51 rotates vertically relative to the folding cart body 10 via the connecting element 52 so that it rests against the front of the folding cart body 10. The folding cart body 10 is then folded, with both sides of the folding cart body 10 closing inwards.The connecting base 11 drives the connecting element 52, which in turn causes the two support rods 51 to rotate relative to the adapter piece 53, so that they approach each other and lie against each other.

[0047] It should be noted that the width of the end of the connecting element 52, which is connected to the support rod 51, must be greater than the width of the support rod 51. This allows the support rod 51 to rotate horizontally relative to the connecting element 52.

[0048] Furthermore, in this embodiment two connecting bases 11 are provided, wherein the two connecting bases 11 are each arranged on the two sides of the front side of the folding trolley body 10, wherein a third limiting device 12 for limiting the rotation of the footrest unit 50 is fixedly arranged on the mutually facing sides of the two connecting bases 11 and the two third limiting devices 12 are connected via a pull cord;

[0049] Specifically, a connecting base 11 is arranged on each side of the lower front edge of the folding trolley body 10, as both two support rods 51 and two connecting elements 52 are provided. A third limiting device 12 is fixedly attached to the opposing sides of the two connecting bases 11. When the connecting element 52 is in a horizontal position relative to the connecting base 11, the third limiting device 12 limits the rotation of the connecting element 52 relative to the connecting base 11. When the connecting element 52 is in a vertical position relative to the connecting base 11, the third limiting device 12 also limits the rotation of the connecting element 52 relative to the connecting base 11.The third limiting device 12 has the same structure as the first limiting device 535 and the second limiting device 536, and the third limiting device 12 is located at the intersection of the top line of the connecting element 52 in a horizontal position and the bottom line of the same in a vertical position. In this way, a single third limiting device 12 can ensure the limitation of the connecting element 52 in both positions.

[0050] To enable synchronous release of the limit of the two third limit devices 12, the third limit devices 12 can be connected to each other via a pull element. If synchronous release of the limit is required, the limit relative to the connecting element 52 can be released by grasping the pull element and rotating it half a turn, ensuring simple and convenient operation.

[0051] Furthermore, in this embodiment, a steering rod 32 is slidably arranged in the control rod 31, wherein the upper side of the steering rod 32 is T-shaped, and a handle 321 is rotatably connected to each of the two ends of the upper side of the steering rod 32, wherein a first sleeve 322 is slidably arranged on the outside of the end of each of the two handles 321 that is connected to the steering rod 32, and wherein several control knobs 323 are provided on the upper side of the steering rod 32, each of which is electrically connected to the control unit 20, and wherein a fourth limiting device 324 is arranged on the outside of the upper side of the steering rod 31, which serves to limit the displacement of the steering rod 32.

[0052] Specifically, the steering rod 32 is slidably arranged within the control rod 31. The steering rod 32 can be extended from the control rod 31 as needed to adjust the working height. The end of the steering rod 32 that protrudes from the control rod 31 is T-shaped. At each of the two ends of the upper surface of the steering rod 32, grip bars 321 are rotatably connected via pivot axes. When in use, the two grip bars 321 can rotate vertically relative to the steering rod 32 and thus be brought into a horizontal position; when not in use, they can rotate vertically relative to the steering rod 32 to reach a vertical position. To fix the grip bar 321 in a horizontal position with the steering rod 32 and prevent it from rotating, a first sleeve 322 is movably arranged on the outside of the end of the steering rod 32 that is connected to the grip bar 321.By sliding the first sleeve 322 to the connecting joint, its two ends surround the steering rod 32 and the handlebar 321, respectively, thus securing them together. To prevent the first sleeve 322 from shifting and detaching from the connecting joint between the steering rod 32 and the handlebar 321 during use, a spring is attached to the end of the first sleeve 322 facing away from the handlebar 321. The force of the spring constantly pushes the first sleeve 322 towards the handlebar 321. In this way, the first sleeve 322 can return to its initial position even if it is unintentionally touched and moved; several control knobs 323 are also arranged at the upper center of the steering rod 32.These control buttons 323 are electrically connected to the control unit 20 via cables, which can be routed out from inside the steering rod 31 to avoid being exposed. The control buttons 323 include, among others, the forward / reverse button, the drive / tow button, the headlight button, the horn button, and the turn signal control button. The control principle can be based on the existing electric bicycle. Since the handlebar 32 is slidably connected to the steering rod 31 to prevent the handlebar 32 from automatically retracting back into the steering rod 31 due to gravity when extended out of it, a fourth limiting device 324 is provided on the top of the steering rod 31.Several detent holes are also provided at intervals on the outer wall of the steering rod 32. These holes cooperate with the fourth limiting device 324. Through the cooperation of the fourth limiting device 324 with the detent holes, the length by which the steering rod 32 projects relative to the control rod 31 is fixed. The fourth limiting device 324 has the same structure as the first limiting device 535 and the second limiting device 536.

[0053] It should be noted that the 323 control buttons can also be implemented as resistance buttons. In this version, the number of wires can be reduced. Each resistance button has a different resistance value. When the corresponding button is pressed, a corresponding resistance value is generated, and the resistance signal is transmitted via the wires to the control unit 20. The control unit 20 receives this resistance signal, recognizes the button's function based on the resistance value, and executes the corresponding controls.

[0054] Furthermore, a display 325 is arranged on the side of the upper side of the steering rod 32, which faces the folding cart body 10, and which is electrically connected to the control unit 20;

[0055] Specifically, a display 325 is provided on the top of the steering column 32, which is electrically connected to the control unit 20. It serves to display the current driving speed, the driving mode, the charge level of the power source 21, etc. The display 325 is oriented towards the folding cart body 10.

[0056] Furthermore, vertically extending extension sections 326 are arranged at the ends of the two handlebars 321, which are located away from the steering rod 32, wherein a second sleeve 327 is slidably arranged on one of the extension sections 326 and an auxiliary switch button 328 is provided on the other extension section 326, which is electrically connected to the control unit 20.

[0057] Specifically, the end of each handle 321 furthest from the connection with the steering rod 32 has an upwardly vertically extending extension section 326 to enable the steering rod 32 to be used in towing mode. When the two handles 321 are rotated upwards, the extension sections 326 of the two handles 321 face each other and touch. Together with the handles 321 and the steering rod 32, this forms a rectangular ring system that facilitates towing in towing mode. Simultaneously, a second sleeve 327 is movably arranged on one of the extension sections 326 to prevent the two extension sections 326 from losing contact with each other. When the two extension sections 326 are facing each other and touching, the second sleeve 327 can be moved to the point of contact between the two extension sections 326.The second sleeve 327 prevents the two extension sections 326 from separating. To separate the two extension sections 326, it is sufficient to simply slide the second sleeve 327 away. The other extension section 326, which does not have a second sleeve 327, has an auxiliary switch 328. This auxiliary switch 328 is electrically connected to the control unit 20 and serves to provide traction assistance in towing mode. That is, by switching the auxiliary switch 328, the electric wheel 41 can run at a constant speed, thus achieving the traction assistance effect.

[0058] To prevent the second sleeve 327 from sliding freely between the two extension sections 326, the rear end of the second sleeve 327 is connected to the extension section 326 to which it is attached by a spring. When the two extension sections 326 are opposite each other and in contact, the force of the spring moves the second sleeve 327 toward the other extension section 326, thus securing it between the two extension sections 326. At the same time, the spring's arrangement prevents unintentional movement that would cause the two extension sections 326 to become separated.

[0059] It should be explained that both the first sleeve 322 and the second sleeve 327 are limited by the way they interact with internal wall projections on the steering rod 32 and the extension section 326 respectively, so that they cannot completely detach.

[0060] Furthermore, handle sleeves 329 are arranged on both handle bars 321, one of the handle sleeves 329 being rotatable with the handle bar 321 and electrically connected to the control unit 20, the handle sleeve 329 rotating with the handle bar 321 as the axis of rotation in order to control the speed of the folding trolley body 10.

[0061] Specifically, one of the two handle sleeves 329 can be rotated relative to the handle 321. This rotatable handle sleeve 329 is electrically connected to the control unit 20 and serves to control the rotational speed of the electric wheel 41. The control principle is as follows: An angle position sensor is attached to the handle sleeve 329. The angle position sensor transmits the rotation angle of the handle sleeve 329 to the control unit 20. The control unit 20 adjusts the output of the corresponding voltage or current according to the rotation angle and adapts the output power of the electric wheel 41, thereby controlling the speed.

[0062] It should be noted that the other handle sleeve 329 can also be designed as a rotatable structure. This handle sleeve 329 can be connected to an electronic braking structure during rotation, thereby controlling the rotational speed of the electric wheel 41 and initiating braking to improve the braking effect. The control principle is the same as that of speed control by the handle sleeve 329. The difference is that, in speed control by the handle sleeve 329, a larger rotation angle results in a higher speed, while in braking by the handle sleeve 329, a larger rotation angle produces a stronger braking force.

[0063] Furthermore, a deflection rod 33 is arranged at the lower end of the control rod 31, wherein the lower end of the deflection rod 33 is connected to the drive wheel component 40, wherein spaced-apart deflection connecting lugs 331 are arranged on the upper side of the deflection rod 33, wherein a plug-in opening 332 is formed between the two deflection connecting lugs 331, wherein a projection 311 is provided at the lower end of the control rod 31, which is inserted between the two deflection connecting lugs 331 and is rotatably connected via a pivot axis, and wherein a folding limiting element 34 is movably arranged in the lower end of the control rod 31, wherein one end of the folding limiting element 34 passes through the projection 311 and is inserted into the plug-in opening 332.

[0064] Specifically, a deflection rod 33 is provided at the lower end of the control rod 31 to facilitate operation when towing is required. The drive wheel assembly 40 is detachably connected to the deflection rod 33. Spaced deflection connection lugs 331 are located on the upper side of the deflection rod 33. Simultaneously, a projecting projection 311 is provided at the lower end of the control rod 31, which is adapted to the distance between the two deflection connection lugs 331. This allows the projection 311 to be inserted between the two deflection connection lugs 331. To create a rotatable connection, the projection 311 and the two deflection connection lugs 331 are connected via a pivot axis, thus enabling rotation of the control rod 31 relative to the deflection rod 33. To prevent the control rod 31 from rotating unintentionally relative to the deflection rod 33, a folding limiting element 34 is slidably arranged in the lower end of the control rod 31.This folding limiting element 34 can slide up and down in the lower end of the control rod 31, and one of its ends can protrude through the projection 311. A return spring 35 is also arranged at the end of the folding limiting element 34 that is located in the control rod 31. When the folding limiting element 34 is pressed by the control rod 32, one of its ends protrudes from the projection 311, and simultaneously the folding limiting element 34 compresses the return spring 35 synchronously. When the force exerted by the control rod 32 is removed, the folding limiting element 34 retracts back into the control rod 31 under the restoring force of the return spring 35. Furthermore, to enable the folding limiting element 34 in the control rod 31 to interact with and fix the deflection rod 33, a plug-in opening 332 is provided between the two deflection connecting eyelets 331 on the top of the deflection rod 33.When one end of the folding limiting element 34 protrudes from the projection 311 and is inserted into the socket 332, the rotation of the control rod 31 relative to the deflection rod 33 is limited by the interaction of the folding limiting element 34 and the socket 332. A pivot axis sliding slot 36 is formed at the center of the folding limiting element 34. The pivot axis, which rotatably connects the control rod 31 and the deflection rod 33, is located in the pivot axis sliding slot 36. This allows the folding limiting element 34 to slide between the control rod 31 and the deflection rod 33. Simultaneously, the return spring 35 pushes the folding limiting element 34 upwards after it loses the compressive force of the control rod 32. At this point, the lifting height of the folding limiting element 34 is limited by the pivot axis and can be adjusted via the length of the pivot axis sliding slot 36.

[0065] Furthermore, in this embodiment, the control unit 20 comprises a control module 22 and at least one power source electrically connected to the control module 22. The drive wheel unit 40 and the steering rod unit 30 are each electrically connected to the control module 22. Specifically, the control module 22 serves to receive the control signals sent by the steering rod unit 30 and to control the function of the drive wheel unit 40 based on these control signals. The power source supplies electrical energy to the control module 22 and the drive wheel unit 40.

[0066] Folding process: As in Fig. As shown in Figure 1, the device is in driving mode. If folding is required, the folding cart body 10 can first be folded. The folding cart body 10 causes the two support rods 51 to move closer together and lean against each other. The third limiting device 12 can then be pulled, causing the support rods 51 to rotate vertically towards the folding cart body 10 and simultaneously raising the steering rod unit 30 and the drive wheel unit 40. At this point, the first limiting device 535 can be released, allowing the shaft bushing 534 to rotate relative to the adapter pivot axis 532. This moves the steering rod 31 – originally perpendicular to the support rods 51 – into a position where it is parallel to the support rods 51. Since the shaft bushing 534 is still at the end of the steering rod 31 at this point (this end is adjacent to the drive wheel unit 40), the steering rod 32 has a relatively large height.By axially displacing the control rod 31 relative to the shaft bushing 534, it can push the drive wheel unit 40 until the latter touches the ground. At this point, the shaft bushing 534 is located at the top of the control rod 31. Through the interaction of the second limiting device 536 with the detent hole on the top of the control rod 31, the locking mechanism between the shaft bushing 534 and the control rod 31 can be achieved, thus completing the folding process.

[0067] Dragging condition: As in Fig.As shown in Figure 9, in driving mode, the steering rod 32 is pulled out of the control rod 31. At this point, the lower end of the steering rod 32 detaches from the folding limiting element 34, and the folding limiting element 34 is pushed upwards by the force of the return spring 35, so that one end of the folding limiting element 34 slides out of the socket 332. After the control rod 31 and the deflection rod 33 have lost the limitation imposed by the folding limiting element 34, the control rod 31 can be pivoted relative to the deflection rod 33. Simultaneously, the height of the steering rod 32 is fixed by the fourth limiting device 324, and the control rod 31 assumes an inclined position relative to the deflection rod 33. This completes the transition to the towing mode. To revert to driving mode, the control rod 31 is pivoted so that it is in a vertical position with the deflection rod 33.The steering rod 32 can then be pushed into the control rod 31, and the lower end of the steering linkage 32 pushes the folding limiting element 34 out of the control rod 31 and into the deflection rod 33. Simultaneously, the steering rod 32 is fixed by the fourth limiting device 324, thus creating the limit between the control rod 31 and the deflection rod 33. This completes the switch to driving mode.

[0068] In summary, the present invention, by arranging the footrest unit and the steering rod unit at the front of the folding cart body, provides the following functions: electrically powered transport of persons and goods, electrically assisted towing, and foldable storage. It is characterized by lightness, portability, and easy mobility to meet the usage requirements in various scenarios. At the same time, the steering rod unit can adapt its configuration to suit the needs, thereby improving practicality. Furthermore, both the footrest unit and the steering rod unit can be folded to reduce space requirements and further enhance practicality.

[0069] 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

[0070] The present invention relates to a mobile electric folding trailer comprising a folding trailer body, a control unit, and a steering rod unit, wherein trailing wheels are attached to the bottom of the rear section of the folding trailer body, the control unit is arranged on the folding trailer body, the steering rod unit comprises a steering rod, and the bottom of the steering rod is connected to a drive wheel unit and a footrest unit, wherein an end of the footrest unit, located away from the steering rod, is connected to the front side of the folding trailer body, and wherein the drive wheel unit is electrically connected to the control unit. With the above design, the arrangement of the footrest unit and the steering rod unit at the front side provides the folding trailer body with the same functions as electrically powered transport of persons and goods, electrically assisted towing, as well as folding and storage.It features lightweight design, portability, and easy mobility to meet usage requirements in various scenarios. Simultaneously, the handlebar unit can adapt its configuration to suit different needs, further enhancing practicality. Additionally, both the footrest and handlebar units can be folded to reduce storage space and improve overall usability. QUOTES INCLUDED IN THE DESCRIPTION

[0000] 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

[0000] CN 202220922980.0

[0003]

Claims

A mobile electric folding trailer, characterized in that it comprises a folding trailer body, a control unit and a steering rod unit, wherein trailing wheels are attached to the bottom of the rear part of the folding trailer body, the control unit is arranged on the folding trailer body, and wherein the steering rod unit comprises a steering rod, the bottom of the steering rod is connected to a drive wheel unit which rotates with the steering rod, wherein the lower end of the steering rod is connected above the drive wheel unit to a footrest unit, the steering rod rotates relative to the footrest unit, an end of the footrest unit located away from the steering rod is connected to the front side of the folding trailer body, and wherein the drive wheel unit is electrically connected to the control unit, and wherein a seat plate is detachably attached to the top of the folding trailer body. Mobile electric folding trailer according to claim 1, characterized in that the drive wheel unit comprises two electric wheels and a frame, wherein the two electric wheels are each electrically connected to the control unit, and wherein a wheel axle is arranged on the top of the frame. Mobile electric folding trailer according to claim 2, characterized in that the two electric wheels are arranged at a distance in the frame, and that the two electric wheels are arranged coaxially, wherein a mounting bore is provided on the underside of the control rod, and the wheel axle is inserted into the mounting bore and is detachably connected to it. Mobile electric folding trailer according to claim 1, characterized in that a connecting base is provided on the front side of the folding trailer body, wherein the end of the footrest unit furthest from the control rod is rotatably connected to the connecting base. Mobile electric folding trailer according to claim 1, characterized in that the footrest unit comprises a support rod and an adapter piece, wherein two support rods are provided, wherein the same end side of the two support rods is rotatably connected to the two ends of the adapter piece, and the adapter piece serves to connect the support rods to the control rod. Mobile electric folding trailer according to claim 5, characterized in that the support rods rotate horizontally relative to the adapter piece. Mobile electric folding trailer according to claim 5, characterized in that the adapter piece comprises two connecting sections and an adapter pivot axis, wherein the two connecting sections are firmly connected to each other via the adapter pivot axis, and wherein a shaft bushing is rotatably connected to the adapter pivot axis, one end of the shaft bushing being movably placed on the outside of the control rod. Mobile electric folding trailer according to claim 7, characterized in that two limiting rods are further arranged between the two connecting sections, each serving to limit the rotation angle of the shaft bushing. Mobile electric folding trailer according to claim 7, characterized in that a first limiting device is arranged on the outside of the end of the shaft bushing which is connected to the adapter pivot axis, wherein the first limiting device serves to fix the rotation angle of the shaft bushing relative to the adapter pivot axis, wherein a second limiting device is arranged on the outside of the end of the shaft bushing which is connected to the control rod, wherein the second limiting device serves to fix the position of the shaft bushing relative to the control rod. Mobile electric folding trailer according to claim 6, characterized in that a connecting element is further arranged at the end of the support rod which is connected to the folding trailer body, wherein the connecting element is rotatably connected to the folding trailer body, wherein the connecting element rotates vertically relative to the folding trailer body, the support rod is rotatably connected to the connecting element and rotates horizontally relative to the connecting element. Mobile electric folding trailer according to claim 4, characterized in that two connecting bases are provided, wherein the two connecting bases are each arranged on the two sides of the front side of the folding trailer body, wherein a third limiting device for limiting the rotation of the footrest unit is fixedly arranged on the mutually facing sides of the two connecting bases and the two third limiting devices are connected via a pull cord. A mobile electric folding trailer according to claim 1, characterized in that a steering rod is slidably arranged in the steering rod, wherein the upper side of the steering rod is T-shaped, and a handle is rotatably connected to each of the two ends of the upper side of the steering rod, wherein a first sleeve is slidably arranged on the outside of the end of each of the two handles that is connected to the steering rod, and wherein several control buttons are provided on the upper side of the steering rod, each of which is electrically connected to the control unit, and wherein a fourth limiting device is arranged on the outside of the upper side of the steering rod, which serves to limit the displacement of the steering rod. Mobile electric folding trailer according to claim 12, characterized in that a display is further arranged on the side of the upper side of the steering rod which faces the folding trailer body and which is electrically connected to the control unit. Mobile electric folding trailer according to claim 12, characterized in that upwardly vertically extending extension sections are arranged at the ends of the two handlebars that are away from the steering rod, wherein a second sleeve is slidably arranged on one of the extension sections and an auxiliary switch button is provided on the other extension section, which is electrically connected to the control unit. Mobile electric folding trailer according to claim 12, characterized in that handle sleeves are arranged on both handle bars, wherein one of the handle sleeves is rotatable with the handle bar and electrically connected to the control unit, wherein the handle sleeve rotates with the handle bar as the axis of rotation in order to control the speed of the folding trailer body. Mobile electric folding trailer according to claim 1, characterized in that a deflection rod is arranged at the lower end of the control rod, wherein the lower end of the deflection rod is connected to the drive wheel unit. Mobile electric folding trailer according to claim 16, characterized in that spaced-apart deflection connection lugs are arranged on the upper side of the deflection rod, wherein a plug-in opening is formed between the two deflection connection lugs, wherein a projection is provided at the lower end of the control rod which is inserted between the two deflection connection lugs and rotatably connected via a pivot axis, and wherein a folding limiting element is movably arranged in the lower end of the control rod, wherein one end of the folding limiting element passes through the projection and is inserted into the plug-in opening. Mobile electric folding trailer according to claim 1, characterized in that the control unit comprises a control unit and at least one power source electrically connected to the control unit, wherein the drive wheel unit and the steering rod unit are each electrically connected to the control unit. Mobile electric folding trailer according to claim 1, characterized in that a foot brake is further provided on the footrest unit, which is connected to the brake structure of the drive wheel unit and / or the trailing wheels.

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