A folding cart
By designing articulated shaft, wheel handle and limiting device in the folding cart, the problem that the cart cannot take into account both load-bearing and folding portability in the prior art is solved, and the cart can be folded stably on the basis of maintaining load-bearing capacity and Compact carrying effect.
Patent Information
- Application Number
- CN202011620343.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-12-31
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2040-12-31
AI Technical Summary
Existing folding carts cannot take into account both load-bearing and easy to carry. Carts with good load-bearing capacity cannot be fully folded. Carts with sufficient folding cannot bear load-bearing. The folded size is larger and heavier, making them inconvenient to carry and store.
A folding cart including shelves, trailer frames and wheels is designed. The shelf rods and trailer frame rods are connected through articulated shafts, and the wheel handles and limits are set. The telescopic pull rods and plug-in lock devices are used to achieve stable expansion and folding of the cart. , ensuring that the wheels run parallel with open state, provide limiting parts and limiting screws to ensure that the cart is stable and compact after folding.
While maintaining load-bearing capacity, the cart can be folded simply and stably, and the folding size is compact, making it easy to carry and store, avoiding the problems of weight and space occupation.
Smart Images
Figure CN112622992B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of carts, and in particular to a foldable cart. Background Art
[0002] Folding carts are commonly used tools in daily life. Folding carts are mostly used in places where goods need to be transported, such as logistics, shopping, and catering. Existing folding carts cannot take into account both load-bearing and convenient carrying. Carts with good load-bearing capacity cannot be fully folded, and fully foldable carts cannot bear weight. Moreover, many carts are still relatively large in size and heavy in weight even after folding, which is very inconvenient to carry. They also occupy a large space when stored, which is inconvenient to store. Therefore, their structure needs to be improved urgently. For example, the folding hand trailer disclosed in the utility model patent with authorization announcement number CN209159735U adopts a folding design, and the wheels can also be folded, which is convenient to carry. However, the wheels are easy to change the original angle under the load-bearing state, which is not stable enough and easily causes wheel damage. Summary of the invention
[0003] The purpose of the present invention is to provide a foldable cart to solve the problems that the foldable cart cannot bear weight and is too large to be carried and stored after being folded.
[0004] To achieve the above object, the present invention adopts the following technical solution:
[0005] A folding cart comprises a shelf, a trailer frame and wheels, the shelf comprises two shelf rods arranged in parallel, the trailer frame comprises two trailer frame rods arranged in parallel, the shelf rod is hinged to the inner side of the trailer frame rod through a hinge shaft, the lower ends of the shelf rod and the trailer frame rod both extend beyond the hinge shaft, a wheel handle is provided at the lower end of the trailer frame rod, the wheel handle comprises a rotating sleeve and a support plate, the rotating sleeve is rotatably assembled on the lower end of the trailer frame rod, the wheel is mounted on the support plate, the lower end of the trailer frame rod is provided with a limiting portion for limiting the wheel handle when the wheel is in an open state; the shelf rod or the wheel handle is provided with a limiting member for limiting the shelf in an open state.
[0006] Further preferably, the shelf rod is provided with the limiting member, the limiting member is a limiting pin or a limiting screw, and the inner side plate of the wheel handle is provided with an arc-shaped limiting groove.
[0007] Further preferably, a telescopic pull rod is provided at the upper end of the trailer frame rod, the telescopic pull rod is sleeved in the trailer frame rod, and the telescopic pull rod can telescopically slide in the trailer frame rod.
[0008] Further preferably, a limiting device for limiting the position of the telescopic pull rod is provided on the trailer frame rod.
[0009] Further preferably, the locking device further comprises a limit release button, and pressing the release button downward drives the limit rod to slide out of the limit hole.
[0010] Further preferably, a cross tube is provided at the upper end of the trailer frame rod, and the cross tube is connected between two parallel trailer frame rods. A locking device is provided in the cross tube, and the locking device includes two limit rods arranged along the length direction of the cross tube, one of the limit rods extends to the left, and the other limit rod extends to the right, and a limit hole is opened on the telescopic rod, and the limit rod is inserted into the limit hole to limit the telescopic rod, thereby limiting the telescopic movement of the telescopic rod.
[0011] Further preferably, the locking device further comprises a limit release button, and pressing the release button downward drives the limit rod to slide out of the limit hole.
[0012] Further preferably, a supporting portion is provided on the shelf, and the supporting portion provides support for the shelf after the shelf is unfolded.
[0013] Further preferably, a cushion block is provided in the lower end portion of the trailer frame rod, a screw hole is provided in the cushion block, a limit screw is mounted in the screw hole, the limit screw is perpendicular to the trailer frame rod, and the limit screw forms the limit portion.
[0014] Beneficial effects of the present invention:
[0015] The folding cart of the present invention comprises a shelf, a trailer frame and wheels. The shelf comprises two shelf rods arranged in parallel, and the trailer frame comprises two trailer frame rods arranged in parallel. The shelf rod is hinged to the inner side of the trailer frame rod through a hinge shaft. The lower ends of the shelf rod and the trailer frame rod both extend beyond the hinge shaft. A wheel handle is arranged at the lower end of the trailer frame rod. The wheel handle comprises a rotating sleeve and a support plate. The rotating sleeve is rotatably assembled on the lower end of the trailer frame rod. The wheel is mounted on the support plate. A limiting portion is arranged at the lower end of the trailer frame rod for limiting the wheel handle when the wheel is in an open state. The trailer frame or the wheel handle is provided with a limiting member for limiting the shelf in an open state. In the open state, the two wheels are parallel and can be towed and load-bearing. The folding cart of the present invention has a simple structure and is convenient to carry after being folded. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic diagram of the folding stroller of the present invention in a folded state;
[0017] Figure 2 is a schematic diagram of the folding stroller of the present invention in an unfolded state;
[0018] Figure 3 is a schematic diagram of a latching device of a folding stroller of the present invention;
[0019] Figure 4 is a schematic diagram of the latching device of the folding stroller of the present invention from another perspective;
[0020] Figure 5 is a partial schematic diagram of the wheels of the folding cart of the present invention;
[0021] Figure 6 It is a partial schematic diagram of the wheels of the foldable stroller of the present invention after being unfolded.
[0022] The names corresponding to the marks in the figure are: 10. The first trailer frame rod, 11. The second trailer frame rod, 12. The cross tube, 13. The button, 14. The first limiting rod, 15. The second limiting rod, 16. The limiting seat, 17. The limiting rod fixing seat, 18. The first limiting groove, 19. The second limiting groove, 20. The first shelf rod, 21. The second shelf rod, 22. The hinge shaft, 23. The bracket, 24. The bracket pull rod, 25. The first limiting screw, 26. The second limiting screw, 30. The first wheel handle, 31. The second wheel handle, 32. The first wheel, 33. The second wheel, 34. The first shelf fixing rod connecting plate, 35. The second shelf fixing rod connecting plate, 36. The first arc limiting groove, 37. The second arc limiting groove, 38. The pad, 4. The telescopic pull rod, 5. The limiting pin. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0024] Embodiment 1 of the present invention:
[0025] Figure 1 As shown, the folding cart comprises: a trailer frame, a shelf and a wheel unit.
[0026] The trailer frame includes two trailer frame rods arranged on the left and right, which are denoted as the first trailer frame rod 10 and the second trailer frame rod 11. A transverse tube 12 is arranged between the first trailer frame rod 10 and the second trailer frame rod 11. One end of the transverse tube 12 is connected to the upper end of the first trailer frame rod 10, and the other end is connected to the upper end of the second trailer frame rod 11. The transverse tube 12 is a square tube. The two ends of the transverse tube 12 are respectively fixedly connected to the upper ends of the first trailer frame rod 10 and the second trailer frame rod 11. A square hole is arranged on the upper end tube wall of the first trailer frame rod 10, and a square hole is also arranged on the upper end tube wall of the second trailer frame rod 11. The square hole is arranged at the position where the left and right ends of the transverse tube 12 are combined with the trailer frame rod. A keyway is arranged on the upper side of the transverse tube 12, and the keyway is arranged at the center of the length direction of the transverse tube 12. A round hole is arranged on the lower side of the transverse tube 12, and the keyway and the round hole are connected.
[0027] A locking device is arranged inside the transverse pipe 12 , and the locking device includes a limiting seat 16 , a first limiting rod 14 , a second limiting rod 15 and a limiting rod fixing seat 17 .
[0028] Figure 3The limit seat 16 shown is an inverted U-shape, including an upper side and two front and rear side surfaces. The upper side surface is provided with a button 13, and both ends of the front and rear side surfaces are respectively provided with limit slots. The limit slots provided at the left and right ends of the limit seat are marked as a first limit slot 18 and a second limit slot 19. Figure 4 As shown, the first limiting groove 18 includes a limiting groove arranged in the up-down direction and a limiting groove arranged in an oblique direction. Similarly, the second limiting groove 19 also includes a limiting groove arranged in the up-down direction and a limiting groove arranged in an oblique direction.
[0029] The width of the first limit rod 14 and the second limit rod 15 is smaller than the width of the limit seat 16. The side plate of the limit seat 16 forms a limit portion for the first limit rod 14 and the second limit rod 15. The right end of the first limit rod 14 protrudes out and a limit pin is provided in the width direction of the first limit rod 14. The two ends of the limit pin pass through the limit groove provided on the left side of the limit seat 16. The left side of the second limit rod 15 protrudes out and a limit pin is provided in the width direction of the second limit rod 15. The two ends of the limit pin pass through the limit groove provided on the right side of the limit seat 16.
[0030] The limit rod fixing seat 17 is arranged at the rear side of the limit seat 16 and fits with the limit seat 16. Notches are arranged on the left and right side plates of the limit rod fixing seat 17. The first limit rod 14 fits with the notch gap on the left side, and the second limit rod 15 fits with the notch gap on the right side.
[0031] A circular boss is provided at the left end of the first limiting rod 14 , and the bottom area of the boss is smaller than the area of the left end face of the first limiting rod 14 . A boss is provided at the right end of the second limiting rod 15 , and the bottom area of the boss is smaller than the area of the right end face of the second limiting rod 15 .
[0032] The bottom surface of the limiting rod fixing seat 17 is provided with a groove for installing a spring.
[0033] The locking device is inserted from one end of the transverse tube 12, and the limit seat 16 is just below the key slot set on the upper side of the transverse tube 12. A spring is placed from the circular hole position on the lower side of the transverse tube 12. After the screws are tightened, the upper end of the spring pushes the limit seat 16 upward, and the button 13 protrudes from the key slot.
[0034] A telescopic rod 4 is provided in the first trailer frame rod 10 and the second trailer frame rod 11. The telescopic rod 4 is sleeved in the first trailer frame rod 10 and the second trailer frame rod 11. A plurality of groups of circular holes are provided on the outer wall of the telescopic rod 4. Each group of circular holes includes two circular holes provided at the same height on the two telescopic rods 4.
[0035] The round hole provided on the telescopic rod 4 is connected with the square hole provided on the upper ends of the first trailer frame rod 10 and the second trailer frame rod 11. The boss on the left side of the first limiting rod 14 is just inserted into the square hole provided on the first trailer frame rod 10, thereby limiting the telescopic rod on the left side. The boss on the right side of the second limiting rod 15 is just inserted into the square hole provided on the second trailer frame rod 11, thereby limiting the telescopic rod on the right side. The bottom area of the boss is smaller than the area of the end face of the limiting rod, so the telescopic rod 4 can be stably clamped.
[0036] When the telescopic rod 4 needs to be pulled out, the button 13 is pressed, and the button 13 drives the first limiting rod 14 to pop out of the lower end of the first limiting groove 18 and slide to the right in the first limiting groove 18, and the boss set at the left end of the first limiting rod seat 14 slides out of the square hole set in the first trailer frame rod 10, releasing the limit on the left telescopic rod. The second limiting rod 15 pops out of the lower end of the second limiting groove 19 and slides to the left in the second limiting groove 19, and the boss set at the right end of the second limiting rod 15 slides out of the square hole set in the second trailer frame rod 11, releasing the limit on the right telescopic rod.
[0037] In order to ensure that the telescopic rod 4 always slides in the first trailer frame rod 10 and the second trailer frame rod 11 without sliding out of the pipe mouth, a limit card is provided at the upper end of the first trailer frame rod and the upper end of the second trailer frame rod, and a limit card slot is provided at the lower end of the telescopic rod 4. When the telescopic rod 4 is pulled out to a certain length, the limit card will be inserted into the limit card slot to limit the telescopic rod 4, ensuring that the telescopic rod 4 cannot be pulled out of the first trailer frame rod 10 and the second trailer frame rod 11.
[0038] Figure 1-Figure 2 As shown, the shelf includes a shelf rod, a hinge shaft 22, a bracket 23, and a bracket pull rod 24.
[0039] The shelf includes two shelf rods arranged on the left and right, which are denoted as a first shelf rod 20 and a second shelf rod 21. A cross brace is arranged between the first shelf rod 20 and the second shelf rod 21, and one end of the cross brace is connected to the upper end of the first shelf rod 20, and the other end is connected to the upper end of the second shelf rod 21.
[0040] The left end of the hinge shaft 22 is fixed to the lower part of the first trailer frame rod 10, and the right end is fixed to the lower part of the second trailer frame rod 11. The lower parts of the first shelf rod 20 and the second shelf rod 21 are provided with through holes penetrating the tube wall. The hinge shaft 22 passes through the first shelf rod 20 and the second shelf rod 21 in sequence, so that the first shelf rod 20 and the second shelf rod 21 are connected to the first trailer frame rod 10 and the second trailer frame rod 11 through the hinge shaft 22. The first shelf rod 20 and the second shelf rod 21 are clearance-matched with the hinge shaft 22, and the shelf can swing up and down with the hinge shaft 22 as the axis.
[0041] A bracket 23 is provided on the upper part of the shelf, one end of the bracket 23 is hinged to the first shelf rod 20, and the other end is hinged to the second shelf rod 21. The bracket 23 can rotate. Two left and right bracket pull rods 24 are provided below the bracket 23. One end of the left bracket pull rod 24 is hinged to the left side of the bracket 23, and the other end is hinged to a first limiting screw 25 arranged at the bottom of the first trailer frame rod 10. One end of the right bracket pull rod is hinged to the right side of the bracket 23, and the other end is hinged to a second limiting screw 26 arranged at the bottom of the second trailer frame rod 11. Figure 3 As shown, a clearance portion is provided on the support rod 24, and the clearance portion can prevent the support rod 24 from abutting against the hinge shaft 22 after the cart is folded, thereby affecting the folding degree.
[0042] Figure 5-Figure 6 As shown, the wheel unit includes a first wheel handle 30 disposed at the lower end of the first trailer frame rod 10 and a second wheel handle 31 disposed at the lower end of the second trailer frame rod 11. The first wheel handle 30 and the second wheel handle 31 include a rotating sleeve and a U-shaped support plate. Figure 5 As shown, the support plate has a double-layer structure, which can make the wheels bear force evenly and can carry more weight.
[0043] The first wheel handle 30 is sleeved on the outer wall of the lower end of the first trailer frame rod 10, and a limiting groove is set at the position where the rotating sleeve of the first wheel handle 30 fits the first trailer frame rod 10. A first limiting screw 25 is set at the lower end of the first trailer frame rod 10. The first limiting screw 25 cooperates with the limiting groove to form a limiting portion for limiting the first wheel handle 30, so that the first wheel handle 30 can rotate a certain angle with the first trailer frame rod 10 as the axis within a set rotation range, and the first wheel 32 is installed in the support plate of the first wheel handle 30.
[0044] The second wheel handle 31 is sleeved on the outer wall of the lower end of the second trailer frame rod 11, and a limiting groove is set at the position where the lower end of the second wheel handle 31 is in contact with the second trailer frame rod 11. A second limiting screw 26 is set at the lower end of the second trailer frame rod 11. The second limiting screw 26 cooperates with the limiting groove to form a limiting portion for limiting the second wheel handle 31, so that the second wheel handle 31 can rotate a certain angle with the second trailer frame rod 11 as the axis within a set rotation range, and the second wheel 33 is installed in the support plate of the second wheel handle 31.
[0045] The first wheel handle 30 is provided with a groove on the upper portion, the first trailer frame rod 10 is provided with a first shelf fixing rod connecting plate 34, and the second trailer frame rod 11 is provided with a second shelf fixing rod connecting plate 35. The groove provided on the first wheel handle 30 and the first shelf fixing rod connecting plate 34 form a limiting portion to prevent the first wheel handle 30 from sliding in the up and down directions of the first trailer frame rod 10, and the groove provided on the second wheel handle 31 and the second shelf fixing rod connecting plate 35 form a limiting portion to prevent the second wheel handle 31 from sliding in the up and down directions of the second trailer frame rod 11.
[0046] A spring is arranged in the lower end tube of the first trailer frame rod 10. Under the action of the spring, the first wheel handle 30 is in a folded state. Figure 1 As shown, the second wheel handle 31 is also in a folded state.
[0047] Adjust the first shelf rod 20 so that it rotates around the hinge shaft 22, the lower end of the first shelf rod 20 presses against the upper side of the first wheel handle 30, and the first wheel handle 30 rotates a certain angle around the first trailer frame rod 10. Similarly, the second shelf rod 21 rotates around the hinge shaft 22, the lower end of the second shelf presses against the upper side of the second wheel handle 31, and the second wheel handle 31 rotates a certain angle around the second trailer frame rod 11. In the final unfolded state, the first wheel handle 30 and the second wheel handle 31 are parallel and can be towed and load-bearing.
[0048] In order to ensure the stability of the shelf, the following design is further made: a first arc-shaped limit groove 36 is provided on the upper side of the first wheel handle 30. As shown in the figure, a first limit pin is provided at the lower end of the first shelf rod 20, and the first limit pin slides in the first arc-shaped limit groove 36. Similarly, a second arc-shaped limit groove 37 is provided on the upper side of the second wheel handle 31, and a second limit pin is also provided at the lower end of the second shelf, and the second limit pin slides in the second arc-shaped limit groove 37. In the folded state, the first limit pin will not be stuck in the first limit groove. In the process of the first shelf rod 20 opening the first wheel handle, the first limit pin gradually slides into the first arc-shaped limit groove. When unfolding, the limit pin is stuck at the end of the arc-shaped limit groove on the first wheel handle 30, forming a limit to the first shelf rod 20, ensuring the stability of the first shelf rod 20. Similarly, in the folded state, the second limit pin will not be stuck in the second limit groove. In the process of the second shelf rod 21 stretching the second wheel handle, the second limit pin gradually slides into the second arc-shaped limit groove. When unfolded, the second limit pin is stuck at the end of the second arc-shaped limit groove on the second wheel handle 31, forming a limit on the second shelf rod 21, ensuring the stability of the second shelf rod 21. After unfolding, the shelf rod also forms a limit on the wheel handle to ensure that the wheel does not flip inward when walking. The limit pin set on the shelf rod further limits the flipping of the wheel handle, and the limit screw set at the lower end of the trailer frame rod limits the flipping of the wheel handle to the outside. The limit screw and the shelf rod limit the wheel handle on the inside and outside at the same time, ensuring the stable operation of the wheel handle and providing the possibility for the trailer to carry more weight.
[0049] Figure 5As shown, a spacer block 38 is provided in the pipe opening at the lower end of the first trailer frame rod 10, and the spacer block 38 blocks the pipe opening to ensure that it is not scratched by the pipe opening during use. A groove is also provided on the spacer block 38, and the groove is used to place a nut. The first limit screw 25 provided on the first trailer frame rod 10 is installed in cooperation with the nut, avoiding welding operation and extending the service life of the first limit screw 25. Similarly, the second limit screw 26 is also connected to the second trailer frame rod 11 through a nut.
[0050] In other embodiments, the number of wheels in the wheel handle can be set to two to further increase the load-bearing capacity, and the wheel can also be a universal wheel for easy rotation.
[0051] In other embodiments, the open state of the shelf can also be limited by providing matching hinges on the first shelf bar 20 and the first trailer frame bar 10 to limit the position of the first shelf bar 20. The second shelf bar 21 and the second trailer frame bar 11 are provided with matching hinges to limit the position of the second shelf bar 21.
[0052] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.
Claims
1. A folding cart, characterized in that: Includes racks, trailer frames and wheels; The shelf comprises two shelf rods arranged in parallel, and the trailer frame comprises two trailer frame rods arranged in parallel, the shelf rods are hinged to the inner side of the trailer frame rods through hinge shafts, and the lower ends of the shelf rods and the trailer frame rods are both beyond the hinge shafts; The lower end of the trailer frame rod is provided with a wheel handle, the wheel handle includes a rotating sleeve and a support plate, the rotating sleeve is rotatably assembled on the lower end of the trailer frame rod, and the wheel is mounted on the support plate; The lower end of the trailer frame rod is provided with a limiting portion for limiting the wheel handle when the wheel is in an open state; a limiting screw is provided at the lower end of the trailer frame rod, and a limiting slot is provided at the portion where the wheel handle and the lower end of the trailer frame rod are in contact, and the limiting screw cooperates with the limiting slot to limit the wheel handle; The shelf rod or wheel handle is provided with a limiting member for limiting the position of the shelf in the open state. The shelf rod is provided with the limiting member, which is a limiting pin or a limiting screw. The inner side plate of the wheel handle is provided with an arc-shaped limiting groove. A telescopic pull rod is provided at the upper end of the trailer frame rod, and the telescopic pull rod is sleeved in the trailer frame rod, and the telescopic pull rod can be telescopically slid in the trailer frame rod; The trailer frame includes two trailer frame rods arranged on the left and right, which are marked as the first trailer frame rod and the second trailer frame rod. A cross tube is arranged between the first trailer frame rod and the second trailer frame rod, and the two ends of the cross tube are respectively fixedly connected to the upper ends of the first trailer frame rod and the second trailer frame rod. A square hole is arranged on the upper end tube wall of the first trailer frame rod, and a square hole is also arranged on the upper end tube wall of the second trailer frame rod. The square holes are arranged at the positions where the left and right ends of the cross tube are combined with the trailer frame rod; a key groove is arranged on the upper side surface of the cross tube, and a round hole is arranged on the lower side surface of the cross tube, and the key groove and the round hole are connected; A latching device is arranged in the transverse pipe, and the latching device comprises a limit seat, a first limit rod, a second limit rod, and a limit rod fixing seat; the limit seat is an inverted U-shape, and comprises an upper side surface and two front and rear side surfaces, a button is arranged on the upper side surface, and limit grooves are arranged at both ends of the front and rear side surfaces, respectively, and the limit grooves arranged at the left and right ends of the limit seat are recorded as the first limit groove and the second limit groove, and the first limit groove comprises a limit groove arranged in the up-down direction and a limit groove arranged in the oblique direction, and similarly, the second limit groove also comprises a limit groove arranged in the up-down direction and a limit groove arranged in the oblique direction; The side plate of the limiting seat forms a limiting portion for the first limiting rod and the second limiting rod. The right end of the first limiting rod protrudes from the width direction of the first limiting rod and a limiting pin is arranged. Both ends of the limiting pin pass through the limiting groove arranged on the left side of the limiting seat. The left side of the second limiting rod protrudes from the width direction of the second limiting rod and a limiting pin is arranged. Both ends of the limiting pin pass through the limiting groove arranged on the right side of the limiting seat. The limit rod fixing seat is arranged at the rear side of the limit seat and fits with the limit seat. The left and right side plates of the limit rod fixing seat are both provided with notches. The first limit rod is matched with the notch gap on the left side, and the second limit rod is matched with the notch gap on the right side. A circular boss is arranged at the left end of the first limiting rod, a boss is arranged at the right end of the second limiting rod, and a groove is arranged on the bottom surface of the limiting rod fixing seat for installing a spring; The locking device is inserted from one end of the horizontal pipe, and the limit seat is just below the key slot set on the upper side of the horizontal pipe. A spring is placed from the circular hole position on the lower side of the horizontal pipe. After the screws are tightened, the upper end of the spring pushes the limit seat upward, and the key protrudes out of the key slot; A telescopic pull rod is provided in the first trailer frame rod and the second trailer frame rod, the telescopic pull rod is sleeved in the first trailer frame rod and the second trailer frame rod, and a plurality of groups of circular holes are provided on the outer wall of the telescopic pull rod, each group of circular holes includes two circular holes provided at the same height on the two telescopic pull rods; The round hole provided on the telescopic pull rod is connected with the square hole provided on the upper ends of the first trailer frame rod and the second trailer frame rod, and the boss on the left side of the first limiting rod is just inserted into the square hole provided on the first trailer frame rod, thereby limiting the left telescopic pull rod, and the boss on the right side of the second limiting rod is just inserted into the square hole provided on the second trailer frame rod, thereby limiting the right telescopic pull rod; When it is necessary to pull out the telescopic rod, press the button, which drives the first limit rod to pop out of the lower end of the first limit slot and slide to the right in the first limit slot, and the boss set at the left end of the first limit rod seat slides out of the square hole set in the first trailer frame rod, thereby releasing the limit on the left telescopic rod; the second limit rod pops out of the lower end of the second limit slot and slides to the left in the second limit slot, and the boss set at the right end of the second limit rod slides out of the square hole set in the second trailer frame rod, thereby releasing the limit on the right telescopic rod.
2. The folding cart according to claim 1, characterized in that: The trailer frame rod is provided with a limiting device for limiting the position of the telescopic pull rod.
3. The folding stroller according to claim 1, characterized in that: The shelf is provided with a supporting part, and the supporting part supports the shelf after the shelf is unfolded.
4. The folding cart according to claim 1, characterized in that: A cushion block is arranged in the lower end of the trailer frame rod, a screw hole is arranged in the cushion block, a limit screw is assembled in the screw hole, the limit screw is perpendicular to the trailer frame rod, and the limit screw forms the limit part.