FOLDING AND MAN-TRANSPORTING STEERING SYSTEM DESIGN OF A FOLDING TROLLEY

Abstract

The invention relates to the field of trolley technology. A foldable structure for transporting a person includes a foldable frame, a connecting device rigidly connected to the lower end of one side of the foldable frame, the connecting device including a frame support base, steering wheels mounted in the lower portion of the frame, the steering wheels connected to a steering structure via steering wheel pivot arms, the steering structure being foldable, the steering structure further connected to a steering rod assembly, and the steering rod assembly configured to control the movement of the steering structure. Thanks to this design, the steering structure, consisting of a plurality of steering levers, is located between two steering wheels and controls the rotation of the steering wheels.Furthermore, the steering structure can be switched between unfolded and folded positions to facilitate folding the folding frame, making operation simple, convenient, and practical. This design allows the steering wheels to be replaced with universal wheels with a straight fork, improving the operational stability and safety of the cart while providing easier steering, a rational design, a simple structure, and a low cost.

Description

AREA OF TECHNOLOGY

[0001] This utility model relates to the field of trolley technology and, in particular, concerns a folding and person-transporting design of a steering system for a folding trolley. LEVEL OF TECHNOLOGY

[0002] As a folding and towable device, the folding cart is widely used for cargo transportation due to its ease of use, heavy-duty capacity, convenient storage, and time and labor savings. Nowadays, folding carts are often used for outdoor activities or short-distance transportation.

[0003] Currently, folding and non-folding trolleys commonly use universal wheels with a tilt fork to facilitate steering. Due to its special design (in which the wheel axis and the steering axis are not aligned vertically), the universal wheel with a tilt fork is more convenient and less labor-intensive in terms of steering than the traditional universal wheel with a straight fork (where the wheel axis and steering axis are aligned vertically). A universal wheel with a tilt fork turns in the direction of the force transmitted, but steering a universal wheel with a tilt fork under free steering is more difficult than a universal wheel with a straight fork. Especially on an uphill slope, the universal wheel with a tilt fork turns in the direction of the lateral force under the influence of that force.To prevent the cart from spinning out of control in the steering direction, it must be manually pulled in the opposite direction, which is inconvenient to use. Furthermore, the cart is typically used outdoors. When free-wheeling, the universal wheel with a tilting fork automatically changes direction when exposed to uneven road surfaces. Although the universal wheel with a tilting fork can be straightened by increasing the forward force, since the universal wheel with a tilting fork is tilted and oscillates due to uneven surfaces, the applied force must exceed the various resistances, which is more critical with a heavy load, significantly affecting the cart's usability.

[0004] Therefore, there is an urgent need to develop a foldable and person-carrying structure of a steering system of a folding trolley to overcome one or more disadvantages of the said prior art.ESSENCE OF THE UTILITY MODEL

[0005] In order to solve the above technical problems, the technical solution applied in the present utility model is as follows: a folding and human-transporting structure of a steering system of a folding trolley includes a folding frame, steering wheels are connected to the lower part of the folding frame, and the steering wheels are connected to a steering structure by means of steering wheel pivot arms, where the steering structure is foldable, a steering rod assembly is further connected to the steering structure, and the steering rod assembly is used to control the movement of the steering structure.

[0006] In a preferred embodiment, the connecting device is connected to one side of the folding frame. The connecting device comprises a frame support base, and the steering wheels are connected to the frame support base. The end portion of the steering stem assembly is connected to the frame support base.

[0007] In a preferred embodiment, the steering structure includes a steering guide rod and steering levers. A plurality of steering levers are arranged, and the plurality of steering levers are sequentially pivotally connected to each other. The steering levers, located at both ends, are pivotally connected to corresponding steering wheel pivot arms. One end of the steering guide rod is movably connected to a steering lever located in the middle, and the other end of the steering guide rod is connected to the steering rod assembly.

[0008] In a preferred embodiment, the distance between the two steering wheel pivot arms at one end is less than or greater than the distance between the horizontal pivot axes of the two steering wheels at the same end.

[0009] In a preferred embodiment, the steering stem assembly includes steering stem support arms and a steering stem. At least two steering stem support arms are provided. The steering stem is located between the two steering stem support arms, and the lower portion of the steering stem is pivotally connected to the steering stem support arms. One end of each of the steering stem support arms adjacent to the steering stem is pivotally connected to the steering stem via a steering bearing, and one end of each of the steering stem support arms remote from the steering stem is pivotally connected to the folding frame.

[0010] In a preferred embodiment, the seat plate is connected to the upper end of the folding frame via a seat plate supporting frame, and the seat plate is detachably disposed on the folding frame.

[0011] In a preferred embodiment, the steering stem is connected to a steering bearing. A folding structure is additionally located on the steering stem, wherein the folding structure is configured to rotate the steering stem in a predetermined direction. A traction rod adapter sleeve is additionally slidably mounted on the steering stem, wherein the traction rod adapter sleeve is configured to limit the steering stem's folding in a predetermined direction.

[0012] In a preferred embodiment, the pedal is further pivotally connected to one end of the folding frame provided with a steering stem assembly.

[0013] In a preferred embodiment, the two ends of the steering lever located in the middle are configured to rotate horizontally relative to the center.

[0014] In a preferred embodiment, a limiter configured to limit the maximum turning angle of the steering wheels is located at one end of the folding frame connected to the steering wheels.

[0015] In a preferred embodiment, two steering wheels connected to the steering structure are respectively provided with wheel rotation limiters interacting with each other, and the wheel rotation limiters are configured to limit the rotation of the steering wheels after the folding frame is folded.

[0016] In a preferred embodiment, the wheel steering limiter includes a pin bushing and a pin. The pin bushing is located on one of the steering wheels, the pin is located on the other steering wheel, and the pin bushing is opposite the pin.

[0017] In a preferred embodiment, one end of the pin sleeve is expanded.

[0018] TECHNICAL ADVANTAGES OF THE UTILITY MODEL

[0019] The technical advantages of this utility model are as follows: a steering structure consisting of a plurality of steering levers is located between two steering wheels, and the steering structure controls the rotation of the steering wheels. In addition, the steering structure can be switched between the unfolded and folded states to facilitate the folding of the folding frame, making the operation simple, convenient, and practical. With this structure, the steering wheels can be replaced with universal wheels with a straight fork, thereby improving the operational stability and safety of the cart, with simpler steering, reasonable design, simple structure, and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 - diagram of the present utility model.

[0021] Fig. 2 is a diagram of the structure of the steering control and the steering rod assembly of the present utility model.

[0022] Fig. 3 - diagram of the folded state Fig. 2.

[0023] Fig. 4 - steering control status diagram Fig. 2.

[0024] Fig. 5 - diagram of the steering rod in a bent state according to the present utility model.

[0025] Fig. 6 - diagram of the steering control according to the Ackermann principle according to the present utility model.

[0026] Fig. 7 is a schematic cross-section of a wheel rotation limiter according to the present utility model.

[0027] Reference numbers on figures:

[0028] 10 - folding frame, 11 - coupling device, 111 - frame support base, 112 - limit groove, 12 - steering wheel, 121 - steering wheel pivot arm, 13 - steering stem unit, 131 - steering stem support arm, 132 - steering stem, 133 - steering bearing, 134 - drawbar adapter sleeve, 14 - steering structure, 141 - steering guide rod, 142 - steering arm, 15 - seat plate, 151 - seat plate supporting frame, 16 - pedal, 17 - wheel turning limiter, 171 - pin bushing, 172 - pin.DETAILED DESCRIPTION OF EMBODIMENTS

[0029] In order to make the above-mentioned objective, features, and advantages of the present utility model more obvious and understandable, specific embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings. This description sets forth numerous specific details to facilitate a full understanding of the present utility model. However, the present utility model can be implemented in many other ways than those described herein. Those skilled in the art can make similar improvements without departing from the essence of the present utility model. Therefore, the present utility model is not limited to the specific examples disclosed below.

[0030] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise specified, the terms "connection" and "installation" should be understood in a broad sense. For example, a "connection" may be detachable or non-detachable; it may be a direct connection or an indirect connection through an intermediate element. In addition, "communication" may be direct or indirect through an intermediate element. In this case, "fixation" means that the elements are connected to each other, and their relative position after connection does not change. The directional indications mentioned in the embodiments of the utility model, such as "inside", "outside", "top", "bottom", etc., are provided only for reference to the directions in the accompanying drawings.Thus, the use of directional indications is intended to better and more clearly describe and understand the embodiments of the utility model, and not to indicate or imply that the said device or element must have a certain orientation, be designed or function in a certain way, and therefore should not be construed as limiting the embodiments of the utility model.

[0031] In the embodiments of the present utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of specified technical characteristics. Thus, features designated as "first" and "second" may explicitly or implicitly include one or more of such features.

[0032] In the embodiments of the present utility model, the expression "and / or" merely describes the relationship between related objects and means that three types of relationships may exist. For example, A and / or B may mean: only A, both A and B simultaneously, or only B. In addition, the symbol " / " in this document generally means that related objects are in an "or" relationship.

[0033] References in this description to "one embodiment," "some embodiments," and the like mean that a particular characteristic, structure, or feature described in connection with this embodiment is present in one or more embodiments of the utility model. Accordingly, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in yet other embodiments," and the like, when appearing in various places in this description, do not necessarily refer to the same embodiment, but mean "one or more, but not all, embodiments," unless otherwise stated or emphasized. The terms "include," "comprise," "have," and their derivatives mean "including, but not limited to," unless otherwise stated or emphasized. Accordingly, the present utility model is not limited to the specific embodiments disclosed below.

[0034] As shown in Fig. 1-5, the present utility model provides a foldable and person-transporting structure of a steering system of a folding trolley. Said structure includes a folding frame 10. Steering wheels 12 are connected to the lower part of the folding frame 10, and the steering wheels 12 are connected to a steering structure 14 by means of steering wheel pivot arms 121. The steering structure 14 is foldable. A steering rod assembly 13 is further connected to the steering structure 14, and the steering rod assembly 13 is configured to control the movement of the steering structure 14.

[0035] Specifically, the folding frame 10 is a converging type body, and the converging type means that the middle part bends upward, and the front, rear, left, and right parts converge to the middle for folding. The converging type body takes up less space when folded than other types of folding frames 10. The folding frame 10 is provided with four connecting devices 11, and the four connecting devices 11 define a rectangle. Each connecting device 11 includes a frame support base 111, and the frame support base 111 is configured to be connected to the frame. The steering wheels 12 are mounted under each of the supporting bases of the frame 111, and the steering wheel pivot arm 121 is located at the top of each of the steering wheels 12. The steering structure 14 is connected between the two steering wheel pivot arms 121, at one end, and the steering structure 14 is configured to control the rotation of the steering wheels 12.The steering rod assembly 13 is further connected to the steering structure 14, the steering rod assembly 13 rotates horizontally relative to the folding frame 10, and the steering rod assembly 13 is configured to control the movement of the steering structure 14. When turning, the steering rod assembly 13 drives the steering structure 14 to turn left and right, and the steering structure 14 drives the steering wheels 12 to turn left and right, thus controlling the rotation of the steering wheels 12.

[0036] Since the steering wheels 12 are connected to each other via the steering structure 14, the steering wheels are driven by the steering structure 14 to turn. Therefore, the steering wheels 12 can be universal wheels with a straight fork, which are more stable when driving compared to universal wheels with an inclined fork. Universal wheels with a straight fork cannot rotate freely and only turn when force is applied in a certain direction, improving operating safety. Under heavy loads, universal wheels with a straight fork provide easier steering. The steering wheels 12 at the front ends of the universal wheels with a straight fork can rotate horizontally, while the steering wheels 12 at the rear ends are fixed and cannot rotate horizontally.

[0037] The steering structure 14 includes a steering guide rod 141 and steering levers 142. A plurality of steering levers 142 are arranged and rotatably connected end to end in series. One end of the steering guide rod 141 is movably connected to the steering lever 142 located in the middle, and the other end of the steering guide rod 141 is connected to the steering rod assembly 13.

[0038] Specifically, the steering structure 14 includes a steering guide rod 141 and a plurality of steering levers 142. The plurality of steering levers 142 are rotatably connected end to end in series so that they can mutually rotate for folding, facilitating the folding of the folding frame 10. One end of the steering guide rod 141 is rotatably connected to the steering lever 142 located in the middle, and the other end is rigidly connected to the steering rod assembly 13. When the steering rod assembly 13 rotates, the steering guide rod 141 is driven to rotate and moves the steering lever 142 left and right, driving the steering wheel 12 connected thereto to control the rotation.Preferably, the number of steering levers 142 is five: two levers at the ends are equal in length, and two levers connected to the ends are also equal in length, forming the shape of a Chinese character when folded. (table).

[0039] It should be noted that the rotation center of the steering guide rod 141 and the rotation center of the steering wheel 12 are located on the same line. With this design, there is no need to provide a sliding groove on the steering guide rod 141. Otherwise, since the moving path of the steering guide rod 141 is arcuate and the steering arm 142 moves in a straight line, it would be necessary to provide a sliding groove on the steering guide rod 141 to prevent rotation failure due to movement conflict.

[0040] Further, the distance between the two steering wheel pivot arms 121 at one end is less than or greater than the distance between the horizontal pivot axes of the two steering wheels 12 at the same end.

[0041] Specifically, as shown in Fig. 6, in order to prevent tire wear caused by the same turning angle of the two steering wheels 12 during steering, the connection points of the extreme left and right steering arms 142 with the corresponding pivot arms of the steering wheels 121 are located on a straight line between the horizontal turning axis of the two front steering wheels 12 and the center of the interval between the two rear steering wheels 12. Therefore, when the two front steering wheels 12 are turned, the extension lines of the vertical turning axes of the front steering wheels 12 intersect with the extension lines of the vertical turning axes of the rear steering wheels 12 at one point, which realizes the Ackermann steering principle and reduces tire wear during turning.

[0042] It should be noted that the distance between the two steering wheel pivot arms 121 is either smaller or larger than the distance between the horizontal rotation axes of the two steering wheels at the same end, according to the structure shown in Fig. 6. With this configuration, the Ackermann steering effect can be fully achieved and is optimal. When the distance between the two steering wheel pivot arms 121 is larger than the distance between the horizontal rotation axes of the two steering wheels at one end, the Ackermann steering effect can still be achieved, but the effect is not optimal.

[0043] Next, the steering rod assembly 13 includes steering rod support arms 131 and a steering rod 132. At least two steering rod support arms 131 are provided. The steering rod 132 is located between the two steering rod support arms 131, and the lower part of the steering rod is pivotally connected to the steering rod support arms 131. One end of each steering rod support arm 131 adjacent to the steering rod 132 is pivotally connected to the steering rod 132 via a steering bearing 133, and the opposite end is pivotally connected to the folding frame 10.

[0044] In particular, the steering stem assembly 13 includes steering stem support arms 131. Two steering stem support arms 131 are provided. One end of each steering stem support arm 131 is pivotally connected to the support base of the frame 111 and can rotate in a vertical plane relative to the support base of the frame 111. The two support arms 131 are located opposite each other. The steering stem 132 is located between them and is connected to the support arms 131 by means of steering bearings 133, allowing the support arms to rotate relative to the steering stem 132. To fold the folding frame 10, the steering stem 132 is first moved by moving the support arm 131 from a horizontal position to an inclined position at an angle. When the frame 10 is folded, the distance between its sides narrows, and the supporting levers 131 converge, moving from an inclined position to a vertical one, which leads to the lifting of the steering rod 132.The lifting of the steering rod 132 synchronously drives the steering structure 14 to lift by means of the guide rod 141. When the frame 10 is unfolded, the two support levers 131 are held in a horizontal position, preventing the vertical movement of the steering rod 132 during use.

[0045] It should be noted that a horizontally protruding element (not shown in the figures) is located on the lower side of the end of each of the two support arms 131 farthest from the steering rod 132. When the support arms 131 are in the horizontal position, the protrusions contact and abut the support seat of the folding frame 10, preventing the support arms from lowering. In addition, the acting forces applied to the connections between the support arms 131 and the steering bearings 133 are distributed between the elements.

[0046] Further, in this embodiment, the seat plate 15 is connected to the upper end of the folding frame 10 via a seat plate support frame 151 and is detachable. Specifically, the detachable installation of the seat plate 1 allows it to be removed as needed without affecting the loading of cargo and the folding of the folding frame 10.

[0047] Further, the steering rod 132 is connected to the steering bearing 133. A folding structure is additionally arranged on the steering rod 132, which is configured to bend the steering rod 132 in a predetermined direction. A traction rod adapter sleeve 134 is additionally mounted slidably on the steering rod 132 and is configured to limit the folding of the steering rod 132.

[0048] Specifically, the steering rod 132 is mounted in the steering bearing 133 and can rotate in a horizontal plane relative to the steering bearing 133, driving the steering guide rod 141 to turn left and right. A folding structure is located on the portion of the steering rod 132 above the steering bearing 133 and allows it to rotate in a predetermined direction, for example, in a vertical plane, relative to the steering bearing for ease of transportation. A traction rod adapter sleeve 134 is movably mounted on the steering rod 132 and is configured to limit the rotation of the steering rod 132 in a predetermined direction. When the adapter sleeve 134 covers the folding structure, the steering rod 132 is limited by this sleeve, that is, it cannot rotate in a vertical plane. To ensure vertical rotation of the steering rod 132, it is necessary to move the adapter sleeve 134 beyond the range of the folding structure.

[0049] It should be noted that the connection between the steering bearing 133 and the steering rod support arm 131 is located at the lower part, which limits the tilt of the steering bearing 133 (such tilt may cause the tilt of the steering rod 132) to a certain extent when the two steering rod support arms 131 are folded.

[0050] Further, in this embodiment, the pedal 16 is further pivotally mounted at the end of the folding frame 10 on which the steering rod assembly 13 is located.

[0051] Specifically, to improve the user's riding comfort, a limiting groove 112 is formed on the support base of the frame 111, in which a pedal 16 is pivotally mounted. When in use, the pedal 16 can be rotated downward to a horizontal working position, allowing the user to place their feet on the pedal 1 during riding. When not needed, the pedal can be pivoted back toward the folding frame 10. Two pedals 16 are provided, one on each side.

[0052] Further, in this embodiment, the two ends of the steering lever 142 located in the middle are configured to rotate horizontally relative to the center.

[0053] Specifically, the two ends of the steering lever 142 located in the middle are configured to rotate horizontally relative to the center, which prevents uneven rotation due to a conflict of motion when turning the steering rod 132. In addition, according to the Ackermann steering principle, this design prevents a situation in which the Ackermann steering effect cannot be normally exerted due to interference between the steering lever 142 and the steering guide rod 141 due to different turning angles of the steering wheels 12 when turning the two steering wheels 12.

[0054] Further, at the end of the folding frame 10 connected to the steering wheel 12, a limiter is arranged, configured to limit the maximum turning angle of the steering wheel 12.

[0055] Specifically, in order to prevent a situation in which the two steering wheels 12 cannot return smoothly after the steering lever 142 has turned to the maximum angle, a limiter (not shown in the figures) is arranged on the lower surface of the support base of the frame 111 or the steering wheel 12. The limiter is configured to interact with the steering lever 142 or the turning levers of the steering wheels 121 to limit further rotation after the steering wheel 12 has reached a certain angle, preventing a situation in which it is impossible to return due to an excessive turning angle.

[0056] Further, in this embodiment, the two steering wheels 12 connected to the steering structure 14 are respectively provided with wheel rotation limiters 17 that interact with each other and are intended to limit the rotation of the steering wheels 12 after the folding frame 10 is folded.

[0057] Specifically, since the steering wheels 12 are not limited after the folding frame 10 is folded, the possible movement causes the steering wheels 12 to rotate. In this case, although the steering structure 14 limits the excessive rotation of the steering wheels 12 to a certain extent, a complete limitation cannot be achieved. When turning, the steering wheels 12 cause the steering structure 14 to move. This movement occurs after folding and may damage the steering structure 14. In order to prevent such a situation, as shown in Fig. 7, two steering wheels 12 connected to the steering structure 14 are respectively provided with wheel rotation limiters 17 that interact with each other. The wheel rotation limiters 17 interact with each other after the two steering wheels 12 approach. The wheel rotation limiters 17 limit the free rotation of the steering wheels 12 after folding, in order to avoid damage to the steering structure 14.

[0058] Next, the wheel turning limiter 17 includes a pin sleeve 171 and a pin 172. The pin sleeve 171 is located on one of the steering wheels 12, the pin 172 is located on the other steering wheel 12, and the pin sleeve 171 is located opposite the pin 172.

[0059] Specifically, the pin sleeve 171 is mounted on one of the steering wheels 12 in a fixed or limited rotation manner, and the pin 172 is mounted on the other steering wheel 12 in a fixed or limited rotation manner. After the two steering wheels 12 approach each other, the pin 172 is inserted into the pin sleeve 171, limiting the rotation of the two steering wheels 12 through the interaction between the pin sleeve 171 and the pin 172. In the folded state, the frame is fixed with a belt. Under the action of the belt, the pin sleeve 171 and the pin 172 on the steering wheels are tightly connected by insertion, preventing them from being separated. Towing can be achieved through the interaction between the pin sleeve 171 and the pin 172, thereby facilitating operation.

[0060] Next, one end of the pin sleeve 171 is made widened.

[0061] Specifically, to improve the smoothness of interaction between the pin sleeve 171 and the pin 172, the end of the pin sleeve 171 facing the pin 172 is widened. This design improves the ease of inserting the pin 172 into the pin sleeve 171.

[0062] Finally, according to the present utility model, a steering structure 14 consisting of a plurality of steering levers 142 is disposed between two steering wheels 12 and controls the rotation of the steering wheels 12. Furthermore, the steering structure 14 can be switched between an unfolded state and a folded state to facilitate the folding of the folding frame 10, achieving simple, convenient, and practical operation. With this design, the steering wheels 12 can be replaced with universal wheels with a straight fork, thereby improving the operational stability and safety of the cart with simpler steering, reasonable design, simple structure, and low cost.

[0063] The present utility model is not limited solely by the descriptions in the specification and embodiments, allowing those skilled in the art to easily achieve additional advantages and modifications. Therefore, the present utility model is not limited to the specific details, representative devices, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept, as defined by the claims of the utility model and their equivalents.

Claims

1. A folding trolley for transporting a person with a device for controlling it, comprising a folding frame of a converging type, on one side of which a connecting device is located, containing a supporting base of the frame, in the lower part of which steering wheels are mounted, connected to a steering structure, which is foldable, by means of rotary levers of the wheels, wherein the steering structure contains a steering guide rod and steering levers, which are located at two ends, connected to the corresponding rotary levers of the wheels, one end of the steering guide rod is movably connected to the steering lever located in the middle, and the other end is connected to the steering rod assembly.

2. A folding cart according to claim 1, characterized in that there is a steering rod assembly that is connected to the steering structure, wherein the steering rod assembly is configured to control the movement of the steering structure, the steering wheels are connected to the supporting base of the frame, and the end portion of the steering rod assembly is connected to the supporting base of the frame.

3. A folding cart according to claim 1, characterized in that a plurality of steering levers are arranged in series and pivotally connected to each other end to end, the steering levers located at both ends are pivotally connected to the corresponding steering levers of the wheels.

4. A folding cart according to claim 1, characterized in that the distance between the two steering arms of the wheels at one end is less than or greater than the distance between the horizontal axes of rotation of the two steering wheels at the same end.

5. A folding cart according to claim 2, characterized in that the steering rod assembly comprises steering rod support arms and a steering rod, wherein at least two such arms are provided, the steering rod is located between them, the lower part of the steering rod is pivotally connected to the support arms, one end of each arm adjacent to the steering rod is pivotally connected to it by means of a steering bearing, and the opposite end of each arm is pivotally connected to the folding frame.

6. A folding cart according to claim 1, characterized in that the seat plate is mounted on the upper end of the folding frame by means of said seat plate supporting frame, wherein the seat plate is removably mounted on the folding frame.

7. A folding trolley according to paragraph 4, characterized in that the steering rod is connected to a steering bearing, a folding structure is installed on the steering rod, which is designed with the possibility of rotating the steering rod in a given direction, the transition sleeve of the traction rod is installed with the possibility of sliding on the steering rod, wherein said sleeve is designed with the possibility of limiting the rotation of the steering rod in a given direction.

8. A folding cart according to claim 1, characterized in that it is additionally provided with a pedal, pivotally connected to the end of the folding frame, provided with a steering rod assembly.

9. A folding trolley according to claim 1, characterized in that the two ends of the steering lever, located in the middle, are designed with the possibility of horizontal rotation relative to its center.

10. A folding trolley according to claim 6, characterized in that the limiter, designed with the possibility of limiting the maximum angle of rotation of the steering wheel, is located at the end of the folding frame connected to the steering wheel.

11. A folding cart according to claim 1, characterized in that two steering wheels connected to the steering structure are respectively provided with wheel rotation limiters interacting with each other, wherein said limiters are designed with the possibility of limiting the rotation of the steering wheels after folding the folding frame.

12. A folding cart according to claim 10, characterized in that the wheel rotation limiter comprises a pin sleeve and a pin, wherein the pin sleeve is located on one of the steering wheels, the pin is located on the other steering wheel, and the pin sleeve is located opposite the pin.

13. A folding trolley according to item 11, characterized in that one end of the pin sleeve is made widened.

14. A folding trolley according to paragraph 3, characterized in that the steering levers are designed with the possibility of rotation in a vertical plane relative to each other.

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